libcomposite-y += composite.o functions.o configfs.o u_f.o
obj-$(CONFIG_USB_GADGET) += udc/ function/ legacy/
-
-usb_f_mtp-y := f_mtp.o
-obj-$(CONFIG_USB_F_MTP) += usb_f_mtp.o
-usb_f_ptp-y := f_ptp.o
-obj-$(CONFIG_USB_F_PTP) += usb_f_ptp.o
-usb_f_audio_source-y := f_audio_source.o
-obj-$(CONFIG_USB_F_AUDIO_SRC) += usb_f_audio_source.o
+++ /dev/null
-/*
- * Gadget Function Driver for USB audio source device
- *
- * Copyright (C) 2012 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/device.h>
-#include <linux/usb/audio.h>
-#include <linux/wait.h>
-#include <sound/core.h>
-#include <sound/initval.h>
-#include <sound/pcm.h>
-
-#include <linux/usb.h>
-#include <linux/usb_usual.h>
-#include <linux/usb/ch9.h>
-#include <linux/configfs.h>
-#include <linux/usb/composite.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#define SAMPLE_RATE 44100
-#define FRAMES_PER_MSEC (SAMPLE_RATE / 1000)
-
-#define IN_EP_MAX_PACKET_SIZE 256
-
-/* Number of requests to allocate */
-#define IN_EP_REQ_COUNT 4
-
-#define AUDIO_AC_INTERFACE 0
-#define AUDIO_AS_INTERFACE 1
-#define AUDIO_NUM_INTERFACES 2
-#define MAX_INST_NAME_LEN 40
-
-/* B.3.1 Standard AC Interface Descriptor */
-static struct usb_interface_descriptor ac_interface_desc = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bNumEndpoints = 0,
- .bInterfaceClass = USB_CLASS_AUDIO,
- .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
-};
-
-DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
-
-#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(AUDIO_NUM_INTERFACES)
-/* 1 input terminal, 1 output terminal and 1 feature unit */
-#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
- + UAC_DT_INPUT_TERMINAL_SIZE + UAC_DT_OUTPUT_TERMINAL_SIZE \
- + UAC_DT_FEATURE_UNIT_SIZE(0))
-/* B.3.2 Class-Specific AC Interface Descriptor */
-static struct uac1_ac_header_descriptor_2 ac_header_desc = {
- .bLength = UAC_DT_AC_HEADER_LENGTH,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubtype = UAC_HEADER,
- .bcdADC = __constant_cpu_to_le16(0x0100),
- .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
- .bInCollection = AUDIO_NUM_INTERFACES,
- .baInterfaceNr = {
- [0] = AUDIO_AC_INTERFACE,
- [1] = AUDIO_AS_INTERFACE,
- }
-};
-
-#define INPUT_TERMINAL_ID 1
-static struct uac_input_terminal_descriptor input_terminal_desc = {
- .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubtype = UAC_INPUT_TERMINAL,
- .bTerminalID = INPUT_TERMINAL_ID,
- .wTerminalType = UAC_INPUT_TERMINAL_MICROPHONE,
- .bAssocTerminal = 0,
- .wChannelConfig = 0x3,
-};
-
-DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
-
-#define FEATURE_UNIT_ID 2
-static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
- .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubtype = UAC_FEATURE_UNIT,
- .bUnitID = FEATURE_UNIT_ID,
- .bSourceID = INPUT_TERMINAL_ID,
- .bControlSize = 2,
-};
-
-#define OUTPUT_TERMINAL_ID 3
-static struct uac1_output_terminal_descriptor output_terminal_desc = {
- .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
- .bTerminalID = OUTPUT_TERMINAL_ID,
- .wTerminalType = UAC_TERMINAL_STREAMING,
- .bAssocTerminal = FEATURE_UNIT_ID,
- .bSourceID = FEATURE_UNIT_ID,
-};
-
-/* B.4.1 Standard AS Interface Descriptor */
-static struct usb_interface_descriptor as_interface_alt_0_desc = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bAlternateSetting = 0,
- .bNumEndpoints = 0,
- .bInterfaceClass = USB_CLASS_AUDIO,
- .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
-};
-
-static struct usb_interface_descriptor as_interface_alt_1_desc = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bAlternateSetting = 1,
- .bNumEndpoints = 1,
- .bInterfaceClass = USB_CLASS_AUDIO,
- .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
-};
-
-/* B.4.2 Class-Specific AS Interface Descriptor */
-static struct uac1_as_header_descriptor as_header_desc = {
- .bLength = UAC_DT_AS_HEADER_SIZE,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubtype = UAC_AS_GENERAL,
- .bTerminalLink = INPUT_TERMINAL_ID,
- .bDelay = 1,
- .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
-};
-
-DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
-
-static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
- .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubtype = UAC_FORMAT_TYPE,
- .bFormatType = UAC_FORMAT_TYPE_I,
- .bSubframeSize = 2,
- .bBitResolution = 16,
- .bSamFreqType = 1,
-};
-
-/* Standard ISO IN Endpoint Descriptor for highspeed */
-static struct usb_endpoint_descriptor hs_as_in_ep_desc = {
- .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_SYNC_SYNC
- | USB_ENDPOINT_XFER_ISOC,
- .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE),
- .bInterval = 4, /* poll 1 per millisecond */
-};
-
-/* Standard ISO IN Endpoint Descriptor for highspeed */
-static struct usb_endpoint_descriptor fs_as_in_ep_desc = {
- .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_SYNC_SYNC
- | USB_ENDPOINT_XFER_ISOC,
- .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE),
- .bInterval = 1, /* poll 1 per millisecond */
-};
-
-/* Class-specific AS ISO OUT Endpoint Descriptor */
-static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
- .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
- .bDescriptorType = USB_DT_CS_ENDPOINT,
- .bDescriptorSubtype = UAC_EP_GENERAL,
- .bmAttributes = 1,
- .bLockDelayUnits = 1,
- .wLockDelay = __constant_cpu_to_le16(1),
-};
-
-static struct usb_descriptor_header *hs_audio_desc[] = {
- (struct usb_descriptor_header *)&ac_interface_desc,
- (struct usb_descriptor_header *)&ac_header_desc,
-
- (struct usb_descriptor_header *)&input_terminal_desc,
- (struct usb_descriptor_header *)&output_terminal_desc,
- (struct usb_descriptor_header *)&feature_unit_desc,
-
- (struct usb_descriptor_header *)&as_interface_alt_0_desc,
- (struct usb_descriptor_header *)&as_interface_alt_1_desc,
- (struct usb_descriptor_header *)&as_header_desc,
-
- (struct usb_descriptor_header *)&as_type_i_desc,
-
- (struct usb_descriptor_header *)&hs_as_in_ep_desc,
- (struct usb_descriptor_header *)&as_iso_in_desc,
- NULL,
-};
-
-static struct usb_descriptor_header *fs_audio_desc[] = {
- (struct usb_descriptor_header *)&ac_interface_desc,
- (struct usb_descriptor_header *)&ac_header_desc,
-
- (struct usb_descriptor_header *)&input_terminal_desc,
- (struct usb_descriptor_header *)&output_terminal_desc,
- (struct usb_descriptor_header *)&feature_unit_desc,
-
- (struct usb_descriptor_header *)&as_interface_alt_0_desc,
- (struct usb_descriptor_header *)&as_interface_alt_1_desc,
- (struct usb_descriptor_header *)&as_header_desc,
-
- (struct usb_descriptor_header *)&as_type_i_desc,
-
- (struct usb_descriptor_header *)&fs_as_in_ep_desc,
- (struct usb_descriptor_header *)&as_iso_in_desc,
- NULL,
-};
-
-static struct snd_pcm_hardware audio_hw_info = {
- .info = SNDRV_PCM_INFO_MMAP |
- SNDRV_PCM_INFO_MMAP_VALID |
- SNDRV_PCM_INFO_BATCH |
- SNDRV_PCM_INFO_INTERLEAVED |
- SNDRV_PCM_INFO_BLOCK_TRANSFER,
-
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- .channels_min = 2,
- .channels_max = 2,
- .rate_min = SAMPLE_RATE,
- .rate_max = SAMPLE_RATE,
-
- .buffer_bytes_max = 1024 * 1024,
- .period_bytes_min = 64,
- .period_bytes_max = 512 * 1024,
- .periods_min = 2,
- .periods_max = 1024,
-};
-
-/*-------------------------------------------------------------------------*/
-
-struct audio_source_config {
- int card;
- int device;
-};
-
-struct audio_dev {
- struct usb_function func;
- struct snd_card *card;
- struct snd_pcm *pcm;
- struct snd_pcm_substream *substream;
-
- struct list_head idle_reqs;
- struct usb_ep *in_ep;
-
- spinlock_t lock;
-
- /* beginning, end and current position in our buffer */
- void *buffer_start;
- void *buffer_end;
- void *buffer_pos;
-
- /* byte size of a "period" */
- unsigned int period;
- /* bytes sent since last call to snd_pcm_period_elapsed */
- unsigned int period_offset;
- /* time we started playing */
- ktime_t start_time;
- /* number of frames sent since start_time */
- s64 frames_sent;
- struct audio_source_config *config;
-};
-
-static inline struct audio_dev *func_to_audio(struct usb_function *f)
-{
- return container_of(f, struct audio_dev, func);
-}
-
-/*-------------------------------------------------------------------------*/
-
-struct audio_source_instance {
- struct usb_function_instance func_inst;
- const char *name;
- struct audio_source_config *config;
- struct device *audio_device;
-};
-
-static void audio_source_attr_release(struct config_item *item);
-
-static struct configfs_item_operations audio_source_item_ops = {
- .release = audio_source_attr_release,
-};
-
-static struct config_item_type audio_source_func_type = {
- .ct_item_ops = &audio_source_item_ops,
- .ct_owner = THIS_MODULE,
-};
-
-static ssize_t audio_source_pcm_show(struct device *dev,
- struct device_attribute *attr, char *buf);
-
-static DEVICE_ATTR(pcm, S_IRUGO, audio_source_pcm_show, NULL);
-
-static struct device_attribute *audio_source_function_attributes[] = {
- &dev_attr_pcm,
- NULL
-};
-
-/*--------------------------------------------------------------------------*/
-
-static struct usb_request *audio_request_new(struct usb_ep *ep, int buffer_size)
-{
- struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
- if (!req)
- return NULL;
-
- req->buf = kmalloc(buffer_size, GFP_KERNEL);
- if (!req->buf) {
- usb_ep_free_request(ep, req);
- return NULL;
- }
- req->length = buffer_size;
- return req;
-}
-
-static void audio_request_free(struct usb_request *req, struct usb_ep *ep)
-{
- if (req) {
- kfree(req->buf);
- usb_ep_free_request(ep, req);
- }
-}
-
-static void audio_req_put(struct audio_dev *audio, struct usb_request *req)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&audio->lock, flags);
- list_add_tail(&req->list, &audio->idle_reqs);
- spin_unlock_irqrestore(&audio->lock, flags);
-}
-
-static struct usb_request *audio_req_get(struct audio_dev *audio)
-{
- unsigned long flags;
- struct usb_request *req;
-
- spin_lock_irqsave(&audio->lock, flags);
- if (list_empty(&audio->idle_reqs)) {
- req = 0;
- } else {
- req = list_first_entry(&audio->idle_reqs, struct usb_request,
- list);
- list_del(&req->list);
- }
- spin_unlock_irqrestore(&audio->lock, flags);
- return req;
-}
-
-/* send the appropriate number of packets to match our bitrate */
-static void audio_send(struct audio_dev *audio)
-{
- struct snd_pcm_runtime *runtime;
- struct usb_request *req;
- int length, length1, length2, ret;
- s64 msecs;
- s64 frames;
- ktime_t now;
-
- /* audio->substream will be null if we have been closed */
- if (!audio->substream)
- return;
- /* audio->buffer_pos will be null if we have been stopped */
- if (!audio->buffer_pos)
- return;
-
- runtime = audio->substream->runtime;
-
- /* compute number of frames to send */
- now = ktime_get();
- msecs = ktime_to_ns(now) - ktime_to_ns(audio->start_time);
- do_div(msecs, 1000000);
- frames = msecs * SAMPLE_RATE;
- do_div(frames, 1000);
-
- /* Readjust our frames_sent if we fall too far behind.
- * If we get too far behind it is better to drop some frames than
- * to keep sending data too fast in an attempt to catch up.
- */
- if (frames - audio->frames_sent > 10 * FRAMES_PER_MSEC)
- audio->frames_sent = frames - FRAMES_PER_MSEC;
-
- frames -= audio->frames_sent;
-
- /* We need to send something to keep the pipeline going */
- if (frames <= 0)
- frames = FRAMES_PER_MSEC;
-
- while (frames > 0) {
- req = audio_req_get(audio);
- if (!req)
- break;
-
- length = frames_to_bytes(runtime, frames);
- if (length > IN_EP_MAX_PACKET_SIZE)
- length = IN_EP_MAX_PACKET_SIZE;
-
- if (audio->buffer_pos + length > audio->buffer_end)
- length1 = audio->buffer_end - audio->buffer_pos;
- else
- length1 = length;
- memcpy(req->buf, audio->buffer_pos, length1);
- if (length1 < length) {
- /* Wrap around and copy remaining length
- * at beginning of buffer.
- */
- length2 = length - length1;
- memcpy(req->buf + length1, audio->buffer_start,
- length2);
- audio->buffer_pos = audio->buffer_start + length2;
- } else {
- audio->buffer_pos += length1;
- if (audio->buffer_pos >= audio->buffer_end)
- audio->buffer_pos = audio->buffer_start;
- }
-
- req->length = length;
- ret = usb_ep_queue(audio->in_ep, req, GFP_ATOMIC);
- if (ret < 0) {
- pr_err("usb_ep_queue failed ret: %d\n", ret);
- audio_req_put(audio, req);
- break;
- }
-
- frames -= bytes_to_frames(runtime, length);
- audio->frames_sent += bytes_to_frames(runtime, length);
- }
-}
-
-static void audio_control_complete(struct usb_ep *ep, struct usb_request *req)
-{
- /* nothing to do here */
-}
-
-static void audio_data_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct audio_dev *audio = req->context;
-
- pr_debug("audio_data_complete req->status %d req->actual %d\n",
- req->status, req->actual);
-
- audio_req_put(audio, req);
-
- if (!audio->buffer_start || req->status)
- return;
-
- audio->period_offset += req->actual;
- if (audio->period_offset >= audio->period) {
- snd_pcm_period_elapsed(audio->substream);
- audio->period_offset = 0;
- }
- audio_send(audio);
-}
-
-static int audio_set_endpoint_req(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- int value = -EOPNOTSUPP;
- u16 ep = le16_to_cpu(ctrl->wIndex);
- u16 len = le16_to_cpu(ctrl->wLength);
- u16 w_value = le16_to_cpu(ctrl->wValue);
-
- pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
- ctrl->bRequest, w_value, len, ep);
-
- switch (ctrl->bRequest) {
- case UAC_SET_CUR:
- case UAC_SET_MIN:
- case UAC_SET_MAX:
- case UAC_SET_RES:
- value = len;
- break;
- default:
- break;
- }
-
- return value;
-}
-
-static int audio_get_endpoint_req(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- struct usb_composite_dev *cdev = f->config->cdev;
- int value = -EOPNOTSUPP;
- u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
- u16 len = le16_to_cpu(ctrl->wLength);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u8 *buf = cdev->req->buf;
-
- pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
- ctrl->bRequest, w_value, len, ep);
-
- if (w_value == UAC_EP_CS_ATTR_SAMPLE_RATE << 8) {
- switch (ctrl->bRequest) {
- case UAC_GET_CUR:
- case UAC_GET_MIN:
- case UAC_GET_MAX:
- case UAC_GET_RES:
- /* return our sample rate */
- buf[0] = (u8)SAMPLE_RATE;
- buf[1] = (u8)(SAMPLE_RATE >> 8);
- buf[2] = (u8)(SAMPLE_RATE >> 16);
- value = 3;
- break;
- default:
- break;
- }
- }
-
- return value;
-}
-
-static int
-audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
-{
- struct usb_composite_dev *cdev = f->config->cdev;
- struct usb_request *req = cdev->req;
- int value = -EOPNOTSUPP;
- u16 w_index = le16_to_cpu(ctrl->wIndex);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u16 w_length = le16_to_cpu(ctrl->wLength);
-
- /* composite driver infrastructure handles everything; interface
- * activation uses set_alt().
- */
- switch (ctrl->bRequestType) {
- case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
- value = audio_set_endpoint_req(f, ctrl);
- break;
-
- case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
- value = audio_get_endpoint_req(f, ctrl);
- break;
- }
-
- /* respond with data transfer or status phase? */
- if (value >= 0) {
- pr_debug("audio req%02x.%02x v%04x i%04x l%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- w_value, w_index, w_length);
- req->zero = 0;
- req->length = value;
- req->complete = audio_control_complete;
- value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
- if (value < 0)
- pr_err("audio response on err %d\n", value);
- }
-
- /* device either stalls (value < 0) or reports success */
- return value;
-}
-
-static int audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
-{
- struct audio_dev *audio = func_to_audio(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- int ret;
-
- pr_debug("audio_set_alt intf %d, alt %d\n", intf, alt);
-
- ret = config_ep_by_speed(cdev->gadget, f, audio->in_ep);
- if (ret)
- return ret;
-
- usb_ep_enable(audio->in_ep);
- return 0;
-}
-
-static void audio_disable(struct usb_function *f)
-{
- struct audio_dev *audio = func_to_audio(f);
-
- pr_debug("audio_disable\n");
- usb_ep_disable(audio->in_ep);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void audio_build_desc(struct audio_dev *audio)
-{
- u8 *sam_freq;
- int rate;
-
- /* Set channel numbers */
- input_terminal_desc.bNrChannels = 2;
- as_type_i_desc.bNrChannels = 2;
-
- /* Set sample rates */
- rate = SAMPLE_RATE;
- sam_freq = as_type_i_desc.tSamFreq[0];
- memcpy(sam_freq, &rate, 3);
-}
-
-
-static int snd_card_setup(struct usb_configuration *c,
- struct audio_source_config *config);
-static struct audio_source_instance *to_fi_audio_source(
- const struct usb_function_instance *fi);
-
-
-/* audio function driver setup/binding */
-static int
-audio_bind(struct usb_configuration *c, struct usb_function *f)
-{
- struct usb_composite_dev *cdev = c->cdev;
- struct audio_dev *audio = func_to_audio(f);
- int status;
- struct usb_ep *ep;
- struct usb_request *req;
- int i;
- int err;
-
- if (IS_ENABLED(CONFIG_USB_CONFIGFS)) {
- struct audio_source_instance *fi_audio =
- to_fi_audio_source(f->fi);
- struct audio_source_config *config =
- fi_audio->config;
-
- err = snd_card_setup(c, config);
- if (err)
- return err;
- }
-
- audio_build_desc(audio);
-
- /* allocate instance-specific interface IDs, and patch descriptors */
- status = usb_interface_id(c, f);
- if (status < 0)
- goto fail;
- ac_interface_desc.bInterfaceNumber = status;
-
- /* AUDIO_AC_INTERFACE */
- ac_header_desc.baInterfaceNr[0] = status;
-
- status = usb_interface_id(c, f);
- if (status < 0)
- goto fail;
- as_interface_alt_0_desc.bInterfaceNumber = status;
- as_interface_alt_1_desc.bInterfaceNumber = status;
-
- /* AUDIO_AS_INTERFACE */
- ac_header_desc.baInterfaceNr[1] = status;
-
- status = -ENODEV;
-
- /* allocate our endpoint */
- ep = usb_ep_autoconfig(cdev->gadget, &fs_as_in_ep_desc);
- if (!ep)
- goto fail;
- audio->in_ep = ep;
- ep->driver_data = audio; /* claim */
-
- if (gadget_is_dualspeed(c->cdev->gadget))
- hs_as_in_ep_desc.bEndpointAddress =
- fs_as_in_ep_desc.bEndpointAddress;
-
- f->fs_descriptors = fs_audio_desc;
- f->hs_descriptors = hs_audio_desc;
-
- for (i = 0, status = 0; i < IN_EP_REQ_COUNT && status == 0; i++) {
- req = audio_request_new(ep, IN_EP_MAX_PACKET_SIZE);
- if (req) {
- req->context = audio;
- req->complete = audio_data_complete;
- audio_req_put(audio, req);
- } else
- status = -ENOMEM;
- }
-
-fail:
- return status;
-}
-
-static void
-audio_unbind(struct usb_configuration *c, struct usb_function *f)
-{
- struct audio_dev *audio = func_to_audio(f);
- struct usb_request *req;
-
- while ((req = audio_req_get(audio)))
- audio_request_free(req, audio->in_ep);
-
- snd_card_free_when_closed(audio->card);
- audio->card = NULL;
- audio->pcm = NULL;
- audio->substream = NULL;
- audio->in_ep = NULL;
-
- if (IS_ENABLED(CONFIG_USB_CONFIGFS)) {
- struct audio_source_instance *fi_audio =
- to_fi_audio_source(f->fi);
- struct audio_source_config *config =
- fi_audio->config;
-
- config->card = -1;
- config->device = -1;
- }
-}
-
-static void audio_pcm_playback_start(struct audio_dev *audio)
-{
- audio->start_time = ktime_get();
- audio->frames_sent = 0;
- audio_send(audio);
-}
-
-static void audio_pcm_playback_stop(struct audio_dev *audio)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&audio->lock, flags);
- audio->buffer_start = 0;
- audio->buffer_end = 0;
- audio->buffer_pos = 0;
- spin_unlock_irqrestore(&audio->lock, flags);
-}
-
-static int audio_pcm_open(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct audio_dev *audio = substream->private_data;
-
- runtime->private_data = audio;
- runtime->hw = audio_hw_info;
- snd_pcm_limit_hw_rates(runtime);
- runtime->hw.channels_max = 2;
-
- audio->substream = substream;
- return 0;
-}
-
-static int audio_pcm_close(struct snd_pcm_substream *substream)
-{
- struct audio_dev *audio = substream->private_data;
- unsigned long flags;
-
- spin_lock_irqsave(&audio->lock, flags);
- audio->substream = NULL;
- spin_unlock_irqrestore(&audio->lock, flags);
-
- return 0;
-}
-
-static int audio_pcm_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
-{
- unsigned int channels = params_channels(params);
- unsigned int rate = params_rate(params);
-
- if (rate != SAMPLE_RATE)
- return -EINVAL;
- if (channels != 2)
- return -EINVAL;
-
- return snd_pcm_lib_alloc_vmalloc_buffer(substream,
- params_buffer_bytes(params));
-}
-
-static int audio_pcm_hw_free(struct snd_pcm_substream *substream)
-{
- return snd_pcm_lib_free_vmalloc_buffer(substream);
-}
-
-static int audio_pcm_prepare(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct audio_dev *audio = runtime->private_data;
-
- audio->period = snd_pcm_lib_period_bytes(substream);
- audio->period_offset = 0;
- audio->buffer_start = runtime->dma_area;
- audio->buffer_end = audio->buffer_start
- + snd_pcm_lib_buffer_bytes(substream);
- audio->buffer_pos = audio->buffer_start;
-
- return 0;
-}
-
-static snd_pcm_uframes_t audio_pcm_pointer(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct audio_dev *audio = runtime->private_data;
- ssize_t bytes = audio->buffer_pos - audio->buffer_start;
-
- /* return offset of next frame to fill in our buffer */
- return bytes_to_frames(runtime, bytes);
-}
-
-static int audio_pcm_playback_trigger(struct snd_pcm_substream *substream,
- int cmd)
-{
- struct audio_dev *audio = substream->runtime->private_data;
- int ret = 0;
-
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_RESUME:
- audio_pcm_playback_start(audio);
- break;
-
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- audio_pcm_playback_stop(audio);
- break;
-
- default:
- ret = -EINVAL;
- }
-
- return ret;
-}
-
-static struct audio_dev _audio_dev = {
- .func = {
- .name = "audio_source",
- .bind = audio_bind,
- .unbind = audio_unbind,
- .set_alt = audio_set_alt,
- .setup = audio_setup,
- .disable = audio_disable,
- },
- .lock = __SPIN_LOCK_UNLOCKED(_audio_dev.lock),
- .idle_reqs = LIST_HEAD_INIT(_audio_dev.idle_reqs),
-};
-
-static struct snd_pcm_ops audio_playback_ops = {
- .open = audio_pcm_open,
- .close = audio_pcm_close,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = audio_pcm_hw_params,
- .hw_free = audio_pcm_hw_free,
- .prepare = audio_pcm_prepare,
- .trigger = audio_pcm_playback_trigger,
- .pointer = audio_pcm_pointer,
-};
-
-int audio_source_bind_config(struct usb_configuration *c,
- struct audio_source_config *config)
-{
- struct audio_dev *audio;
- int err;
-
- config->card = -1;
- config->device = -1;
-
- audio = &_audio_dev;
-
- err = snd_card_setup(c, config);
- if (err)
- return err;
-
- err = usb_add_function(c, &audio->func);
- if (err)
- goto add_fail;
-
- return 0;
-
-add_fail:
- snd_card_free(audio->card);
- return err;
-}
-
-static int snd_card_setup(struct usb_configuration *c,
- struct audio_source_config *config)
-{
- struct audio_dev *audio;
- struct snd_card *card;
- struct snd_pcm *pcm;
- int err;
-
- audio = &_audio_dev;
-
- err = snd_card_new(&c->cdev->gadget->dev,
- SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
- THIS_MODULE, 0, &card);
- if (err)
- return err;
-
- err = snd_pcm_new(card, "USB audio source", 0, 1, 0, &pcm);
- if (err)
- goto pcm_fail;
-
- pcm->private_data = audio;
- pcm->info_flags = 0;
- audio->pcm = pcm;
-
- strlcpy(pcm->name, "USB gadget audio", sizeof(pcm->name));
-
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &audio_playback_ops);
- snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
- NULL, 0, 64 * 1024);
-
- strlcpy(card->driver, "audio_source", sizeof(card->driver));
- strlcpy(card->shortname, card->driver, sizeof(card->shortname));
- strlcpy(card->longname, "USB accessory audio source",
- sizeof(card->longname));
-
- err = snd_card_register(card);
- if (err)
- goto register_fail;
-
- config->card = pcm->card->number;
- config->device = pcm->device;
- audio->card = card;
- return 0;
-
-register_fail:
-pcm_fail:
- snd_card_free(audio->card);
- return err;
-}
-
-static struct audio_source_instance *to_audio_source_instance(
- struct config_item *item)
-{
- return container_of(to_config_group(item), struct audio_source_instance,
- func_inst.group);
-}
-
-static struct audio_source_instance *to_fi_audio_source(
- const struct usb_function_instance *fi)
-{
- return container_of(fi, struct audio_source_instance, func_inst);
-}
-
-static void audio_source_attr_release(struct config_item *item)
-{
- struct audio_source_instance *fi_audio = to_audio_source_instance(item);
-
- usb_put_function_instance(&fi_audio->func_inst);
-}
-
-static int audio_source_set_inst_name(struct usb_function_instance *fi,
- const char *name)
-{
- struct audio_source_instance *fi_audio;
- char *ptr;
- int name_len;
-
- name_len = strlen(name) + 1;
- if (name_len > MAX_INST_NAME_LEN)
- return -ENAMETOOLONG;
-
- ptr = kstrndup(name, name_len, GFP_KERNEL);
- if (!ptr)
- return -ENOMEM;
-
- fi_audio = to_fi_audio_source(fi);
- fi_audio->name = ptr;
-
- return 0;
-}
-
-static void audio_source_free_inst(struct usb_function_instance *fi)
-{
- struct audio_source_instance *fi_audio;
-
- fi_audio = to_fi_audio_source(fi);
- device_destroy(fi_audio->audio_device->class,
- fi_audio->audio_device->devt);
- kfree(fi_audio->name);
- kfree(fi_audio->config);
-}
-
-static ssize_t audio_source_pcm_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct audio_source_instance *fi_audio = dev_get_drvdata(dev);
- struct audio_source_config *config = fi_audio->config;
-
- /* print PCM card and device numbers */
- return sprintf(buf, "%d %d\n", config->card, config->device);
-}
-
-struct device *create_function_device(char *name);
-
-static struct usb_function_instance *audio_source_alloc_inst(void)
-{
- struct audio_source_instance *fi_audio;
- struct device_attribute **attrs;
- struct device_attribute *attr;
- struct device *dev;
- void *err_ptr;
- int err = 0;
-
- fi_audio = kzalloc(sizeof(*fi_audio), GFP_KERNEL);
- if (!fi_audio)
- return ERR_PTR(-ENOMEM);
-
- fi_audio->func_inst.set_inst_name = audio_source_set_inst_name;
- fi_audio->func_inst.free_func_inst = audio_source_free_inst;
-
- fi_audio->config = kzalloc(sizeof(struct audio_source_config),
- GFP_KERNEL);
- if (!fi_audio->config) {
- err_ptr = ERR_PTR(-ENOMEM);
- goto fail_audio;
- }
-
- config_group_init_type_name(&fi_audio->func_inst.group, "",
- &audio_source_func_type);
- dev = create_function_device("f_audio_source");
-
- if (IS_ERR(dev)) {
- err_ptr = dev;
- goto fail_audio_config;
- }
-
- fi_audio->config->card = -1;
- fi_audio->config->device = -1;
- fi_audio->audio_device = dev;
-
- attrs = audio_source_function_attributes;
- if (attrs) {
- while ((attr = *attrs++) && !err)
- err = device_create_file(dev, attr);
- if (err) {
- err_ptr = ERR_PTR(-EINVAL);
- goto fail_device;
- }
- }
-
- dev_set_drvdata(dev, fi_audio);
- _audio_dev.config = fi_audio->config;
-
- return &fi_audio->func_inst;
-
-fail_device:
- device_destroy(dev->class, dev->devt);
-fail_audio_config:
- kfree(fi_audio->config);
-fail_audio:
- kfree(fi_audio);
- return err_ptr;
-
-}
-
-static struct usb_function *audio_source_alloc(struct usb_function_instance *fi)
-{
- return &_audio_dev.func;
-}
-
-DECLARE_USB_FUNCTION_INIT(audio_source, audio_source_alloc_inst,
- audio_source_alloc);
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * Gadget Function Driver for MTP
- *
- * Copyright (C) 2010 Google, Inc.
- * Author: Mike Lockwood <lockwood@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-/* #define DEBUG */
-/* #define VERBOSE_DEBUG */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/poll.h>
-#include <linux/delay.h>
-#include <linux/wait.h>
-#include <linux/err.h>
-#include <linux/interrupt.h>
-
-#include <linux/types.h>
-#include <linux/file.h>
-#include <linux/device.h>
-#include <linux/miscdevice.h>
-
-#include <linux/usb.h>
-#include <linux/usb_usual.h>
-#include <linux/usb/ch9.h>
-#include <linux/usb/f_mtp.h>
-#include <linux/configfs.h>
-#include <linux/usb/composite.h>
-
-#include "configfs.h"
-
-#define MTP_BULK_BUFFER_SIZE 16384
-#define INTR_BUFFER_SIZE 28
-#define MAX_INST_NAME_LEN 40
-
-/* String IDs */
-#define INTERFACE_STRING_INDEX 0
-
-/* values for mtp_dev.state */
-#define STATE_OFFLINE 0 /* initial state, disconnected */
-#define STATE_READY 1 /* ready for userspace calls */
-#define STATE_BUSY 2 /* processing userspace calls */
-#define STATE_CANCELED 3 /* transaction canceled by host */
-#define STATE_ERROR 4 /* error from completion routine */
-
-/* number of tx and rx requests to allocate */
-#define TX_REQ_MAX 4
-#define RX_REQ_MAX 2
-#define INTR_REQ_MAX 5
-
-/* ID for Microsoft MTP OS String */
-#define MTP_OS_STRING_ID 0xEE
-
-/* MTP class reqeusts */
-#define MTP_REQ_CANCEL 0x64
-#define MTP_REQ_GET_EXT_EVENT_DATA 0x65
-#define MTP_REQ_RESET 0x66
-#define MTP_REQ_GET_DEVICE_STATUS 0x67
-
-/* constants for device status */
-#define MTP_RESPONSE_OK 0x2001
-#define MTP_RESPONSE_DEVICE_BUSY 0x2019
-#define DRIVER_NAME "mtp"
-
-static const char mtp_shortname[] = DRIVER_NAME "_usb";
-
-struct mtp_dev {
- struct usb_function function;
- struct usb_composite_dev *cdev;
- spinlock_t lock;
-
- struct usb_ep *ep_in;
- struct usb_ep *ep_out;
- struct usb_ep *ep_intr;
-
- int state;
-
- /* synchronize access to our device file */
- atomic_t open_excl;
- /* to enforce only one ioctl at a time */
- atomic_t ioctl_excl;
-
- struct list_head tx_idle;
- struct list_head intr_idle;
-
- wait_queue_head_t read_wq;
- wait_queue_head_t write_wq;
- wait_queue_head_t intr_wq;
- struct usb_request *rx_req[RX_REQ_MAX];
- int rx_done;
-
- /* for processing MTP_SEND_FILE, MTP_RECEIVE_FILE and
- * MTP_SEND_FILE_WITH_HEADER ioctls on a work queue
- */
- struct workqueue_struct *wq;
- struct work_struct send_file_work;
- struct work_struct receive_file_work;
- struct file *xfer_file;
- loff_t xfer_file_offset;
- int64_t xfer_file_length;
- unsigned xfer_send_header;
- uint16_t xfer_command;
- uint32_t xfer_transaction_id;
- int xfer_result;
-};
-
-static struct usb_interface_descriptor mtp_interface_desc = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = 0,
- .bNumEndpoints = 3,
- .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
- .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
- .bInterfaceProtocol = 0,
-};
-
-static struct usb_interface_descriptor ptp_interface_desc = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = 0,
- .bNumEndpoints = 3,
- .bInterfaceClass = USB_CLASS_STILL_IMAGE,
- .bInterfaceSubClass = 1,
- .bInterfaceProtocol = 1,
-};
-
-static struct usb_endpoint_descriptor mtp_highspeed_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = __constant_cpu_to_le16(512),
-};
-
-static struct usb_endpoint_descriptor mtp_highspeed_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = __constant_cpu_to_le16(512),
-};
-
-static struct usb_endpoint_descriptor mtp_fullspeed_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
-};
-
-static struct usb_endpoint_descriptor mtp_fullspeed_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
-};
-
-static struct usb_endpoint_descriptor mtp_intr_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_INT,
- .wMaxPacketSize = __constant_cpu_to_le16(INTR_BUFFER_SIZE),
- .bInterval = 6,
-};
-
-static struct usb_descriptor_header *fs_mtp_descs[] = {
- (struct usb_descriptor_header *) &mtp_interface_desc,
- (struct usb_descriptor_header *) &mtp_fullspeed_in_desc,
- (struct usb_descriptor_header *) &mtp_fullspeed_out_desc,
- (struct usb_descriptor_header *) &mtp_intr_desc,
- NULL,
-};
-
-static struct usb_descriptor_header *hs_mtp_descs[] = {
- (struct usb_descriptor_header *) &mtp_interface_desc,
- (struct usb_descriptor_header *) &mtp_highspeed_in_desc,
- (struct usb_descriptor_header *) &mtp_highspeed_out_desc,
- (struct usb_descriptor_header *) &mtp_intr_desc,
- NULL,
-};
-
-static struct usb_descriptor_header *fs_ptp_descs[] = {
- (struct usb_descriptor_header *) &ptp_interface_desc,
- (struct usb_descriptor_header *) &mtp_fullspeed_in_desc,
- (struct usb_descriptor_header *) &mtp_fullspeed_out_desc,
- (struct usb_descriptor_header *) &mtp_intr_desc,
- NULL,
-};
-
-static struct usb_descriptor_header *hs_ptp_descs[] = {
- (struct usb_descriptor_header *) &ptp_interface_desc,
- (struct usb_descriptor_header *) &mtp_highspeed_in_desc,
- (struct usb_descriptor_header *) &mtp_highspeed_out_desc,
- (struct usb_descriptor_header *) &mtp_intr_desc,
- NULL,
-};
-
-static struct usb_string mtp_string_defs[] = {
- /* Naming interface "MTP" so libmtp will recognize us */
- [INTERFACE_STRING_INDEX].s = "MTP",
- { }, /* end of list */
-};
-
-static struct usb_gadget_strings mtp_string_table = {
- .language = 0x0409, /* en-US */
- .strings = mtp_string_defs,
-};
-
-static struct usb_gadget_strings *mtp_strings[] = {
- &mtp_string_table,
- NULL,
-};
-
-/* Microsoft MTP OS String */
-static u8 mtp_os_string[] = {
- 18, /* sizeof(mtp_os_string) */
- USB_DT_STRING,
- /* Signature field: "MSFT100" */
- 'M', 0, 'S', 0, 'F', 0, 'T', 0, '1', 0, '0', 0, '0', 0,
- /* vendor code */
- 1,
- /* padding */
- 0
-};
-
-/* Microsoft Extended Configuration Descriptor Header Section */
-struct mtp_ext_config_desc_header {
- __le32 dwLength;
- __u16 bcdVersion;
- __le16 wIndex;
- __u8 bCount;
- __u8 reserved[7];
-};
-
-/* Microsoft Extended Configuration Descriptor Function Section */
-struct mtp_ext_config_desc_function {
- __u8 bFirstInterfaceNumber;
- __u8 bInterfaceCount;
- __u8 compatibleID[8];
- __u8 subCompatibleID[8];
- __u8 reserved[6];
-};
-
-/* MTP Extended Configuration Descriptor */
-struct {
- struct mtp_ext_config_desc_header header;
- struct mtp_ext_config_desc_function function;
-} mtp_ext_config_desc = {
- .header = {
- .dwLength = __constant_cpu_to_le32(sizeof(mtp_ext_config_desc)),
- .bcdVersion = __constant_cpu_to_le16(0x0100),
- .wIndex = __constant_cpu_to_le16(4),
- .bCount = __constant_cpu_to_le16(1),
- },
- .function = {
- .bFirstInterfaceNumber = 0,
- .bInterfaceCount = 1,
- .compatibleID = { 'M', 'T', 'P' },
- },
-};
-
-struct mtp_device_status {
- __le16 wLength;
- __le16 wCode;
-};
-
-struct mtp_data_header {
- /* length of packet, including this header */
- __le32 length;
- /* container type (2 for data packet) */
- __le16 type;
- /* MTP command code */
- __le16 command;
- /* MTP transaction ID */
- __le32 transaction_id;
-};
-
-struct mtp_instance {
- struct usb_function_instance func_inst;
- const char *name;
- struct mtp_dev *dev;
-};
-
-/* temporary variable used between mtp_open() and mtp_gadget_bind() */
-static struct mtp_dev *_mtp_dev;
-
-static inline struct mtp_dev *func_to_mtp(struct usb_function *f)
-{
- return container_of(f, struct mtp_dev, function);
-}
-
-static struct usb_request *mtp_request_new(struct usb_ep *ep, int buffer_size)
-{
- struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
- if (!req)
- return NULL;
-
- /* now allocate buffers for the requests */
- req->buf = kmalloc(buffer_size, GFP_KERNEL);
- if (!req->buf) {
- usb_ep_free_request(ep, req);
- return NULL;
- }
-
- return req;
-}
-
-static void mtp_request_free(struct usb_request *req, struct usb_ep *ep)
-{
- if (req) {
- kfree(req->buf);
- usb_ep_free_request(ep, req);
- }
-}
-
-static inline int mtp_lock(atomic_t *excl)
-{
- if (atomic_inc_return(excl) == 1) {
- return 0;
- } else {
- atomic_dec(excl);
- return -1;
- }
-}
-
-static inline void mtp_unlock(atomic_t *excl)
-{
- atomic_dec(excl);
-}
-
-/* add a request to the tail of a list */
-static void mtp_req_put(struct mtp_dev *dev, struct list_head *head,
- struct usb_request *req)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&dev->lock, flags);
- list_add_tail(&req->list, head);
- spin_unlock_irqrestore(&dev->lock, flags);
-}
-
-/* remove a request from the head of a list */
-static struct usb_request
-*mtp_req_get(struct mtp_dev *dev, struct list_head *head)
-{
- unsigned long flags;
- struct usb_request *req;
-
- spin_lock_irqsave(&dev->lock, flags);
- if (list_empty(head)) {
- req = 0;
- } else {
- req = list_first_entry(head, struct usb_request, list);
- list_del(&req->list);
- }
- spin_unlock_irqrestore(&dev->lock, flags);
- return req;
-}
-
-static void mtp_complete_in(struct usb_ep *ep, struct usb_request *req)
-{
- struct mtp_dev *dev = _mtp_dev;
-
- if (req->status != 0)
- dev->state = STATE_ERROR;
-
- mtp_req_put(dev, &dev->tx_idle, req);
-
- wake_up(&dev->write_wq);
-}
-
-static void mtp_complete_out(struct usb_ep *ep, struct usb_request *req)
-{
- struct mtp_dev *dev = _mtp_dev;
-
- dev->rx_done = 1;
- if (req->status != 0)
- dev->state = STATE_ERROR;
-
- wake_up(&dev->read_wq);
-}
-
-static void mtp_complete_intr(struct usb_ep *ep, struct usb_request *req)
-{
- struct mtp_dev *dev = _mtp_dev;
-
- if (req->status != 0)
- dev->state = STATE_ERROR;
-
- mtp_req_put(dev, &dev->intr_idle, req);
-
- wake_up(&dev->intr_wq);
-}
-
-static int mtp_create_bulk_endpoints(struct mtp_dev *dev,
- struct usb_endpoint_descriptor *in_desc,
- struct usb_endpoint_descriptor *out_desc,
- struct usb_endpoint_descriptor *intr_desc)
-{
- struct usb_composite_dev *cdev = dev->cdev;
- struct usb_request *req;
- struct usb_ep *ep;
- int i;
-
- DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
-
- ep = usb_ep_autoconfig(cdev->gadget, in_desc);
- if (!ep) {
- DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
- return -ENODEV;
- }
- DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
- ep->driver_data = dev; /* claim the endpoint */
- dev->ep_in = ep;
-
- ep = usb_ep_autoconfig(cdev->gadget, out_desc);
- if (!ep) {
- DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
- return -ENODEV;
- }
- DBG(cdev, "usb_ep_autoconfig for mtp ep_out got %s\n", ep->name);
- ep->driver_data = dev; /* claim the endpoint */
- dev->ep_out = ep;
-
- ep = usb_ep_autoconfig(cdev->gadget, intr_desc);
- if (!ep) {
- DBG(cdev, "usb_ep_autoconfig for ep_intr failed\n");
- return -ENODEV;
- }
- DBG(cdev, "usb_ep_autoconfig for mtp ep_intr got %s\n", ep->name);
- ep->driver_data = dev; /* claim the endpoint */
- dev->ep_intr = ep;
-
- /* now allocate requests for our endpoints */
- for (i = 0; i < TX_REQ_MAX; i++) {
- req = mtp_request_new(dev->ep_in, MTP_BULK_BUFFER_SIZE);
- if (!req)
- goto fail;
- req->complete = mtp_complete_in;
- mtp_req_put(dev, &dev->tx_idle, req);
- }
- for (i = 0; i < RX_REQ_MAX; i++) {
- req = mtp_request_new(dev->ep_out, MTP_BULK_BUFFER_SIZE);
- if (!req)
- goto fail;
- req->complete = mtp_complete_out;
- dev->rx_req[i] = req;
- }
- for (i = 0; i < INTR_REQ_MAX; i++) {
- req = mtp_request_new(dev->ep_intr, INTR_BUFFER_SIZE);
- if (!req)
- goto fail;
- req->complete = mtp_complete_intr;
- mtp_req_put(dev, &dev->intr_idle, req);
- }
-
- return 0;
-
-fail:
- pr_err("mtp_bind() could not allocate requests\n");
- return -1;
-}
-
-static ssize_t mtp_read(struct file *fp, char __user *buf,
- size_t count, loff_t *pos)
-{
- struct mtp_dev *dev = fp->private_data;
- struct usb_composite_dev *cdev = dev->cdev;
- struct usb_request *req;
- ssize_t r = count;
- unsigned xfer;
- int ret = 0;
-
- DBG(cdev, "mtp_read(%zu)\n", count);
-
- if (count > MTP_BULK_BUFFER_SIZE)
- return -EINVAL;
-
- /* we will block until we're online */
- DBG(cdev, "mtp_read: waiting for online state\n");
- ret = wait_event_interruptible(dev->read_wq,
- dev->state != STATE_OFFLINE);
- if (ret < 0) {
- r = ret;
- goto done;
- }
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_CANCELED) {
- /* report cancelation to userspace */
- dev->state = STATE_READY;
- spin_unlock_irq(&dev->lock);
- return -ECANCELED;
- }
- dev->state = STATE_BUSY;
- spin_unlock_irq(&dev->lock);
-
-requeue_req:
- /* queue a request */
- req = dev->rx_req[0];
- req->length = count;
- dev->rx_done = 0;
- ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
- if (ret < 0) {
- r = -EIO;
- goto done;
- } else {
- DBG(cdev, "rx %p queue\n", req);
- }
-
- /* wait for a request to complete */
- ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
- if (ret < 0) {
- r = ret;
- usb_ep_dequeue(dev->ep_out, req);
- goto done;
- }
- if (dev->state == STATE_BUSY) {
- /* If we got a 0-len packet, throw it back and try again. */
- if (req->actual == 0)
- goto requeue_req;
-
- DBG(cdev, "rx %p %d\n", req, req->actual);
- xfer = (req->actual < count) ? req->actual : count;
- r = xfer;
- if (copy_to_user(buf, req->buf, xfer))
- r = -EFAULT;
- } else
- r = -EIO;
-
-done:
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_CANCELED)
- r = -ECANCELED;
- else if (dev->state != STATE_OFFLINE)
- dev->state = STATE_READY;
- spin_unlock_irq(&dev->lock);
-
- DBG(cdev, "mtp_read returning %zd\n", r);
- return r;
-}
-
-static ssize_t mtp_write(struct file *fp, const char __user *buf,
- size_t count, loff_t *pos)
-{
- struct mtp_dev *dev = fp->private_data;
- struct usb_composite_dev *cdev = dev->cdev;
- struct usb_request *req = 0;
- ssize_t r = count;
- unsigned xfer;
- int sendZLP = 0;
- int ret;
-
- DBG(cdev, "mtp_write(%zu)\n", count);
-
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_CANCELED) {
- /* report cancelation to userspace */
- dev->state = STATE_READY;
- spin_unlock_irq(&dev->lock);
- return -ECANCELED;
- }
- if (dev->state == STATE_OFFLINE) {
- spin_unlock_irq(&dev->lock);
- return -ENODEV;
- }
- dev->state = STATE_BUSY;
- spin_unlock_irq(&dev->lock);
-
- /* we need to send a zero length packet to signal the end of transfer
- * if the transfer size is aligned to a packet boundary.
- */
- if ((count & (dev->ep_in->maxpacket - 1)) == 0)
- sendZLP = 1;
-
- while (count > 0 || sendZLP) {
- /* so we exit after sending ZLP */
- if (count == 0)
- sendZLP = 0;
-
- if (dev->state != STATE_BUSY) {
- DBG(cdev, "mtp_write dev->error\n");
- r = -EIO;
- break;
- }
-
- /* get an idle tx request to use */
- req = 0;
- ret = wait_event_interruptible(dev->write_wq,
- ((req = mtp_req_get(dev, &dev->tx_idle))
- || dev->state != STATE_BUSY));
- if (!req) {
- r = ret;
- break;
- }
-
- if (count > MTP_BULK_BUFFER_SIZE)
- xfer = MTP_BULK_BUFFER_SIZE;
- else
- xfer = count;
- if (xfer && copy_from_user(req->buf, buf, xfer)) {
- r = -EFAULT;
- break;
- }
-
- req->length = xfer;
- ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
- if (ret < 0) {
- DBG(cdev, "mtp_write: xfer error %d\n", ret);
- r = -EIO;
- break;
- }
-
- buf += xfer;
- count -= xfer;
-
- /* zero this so we don't try to free it on error exit */
- req = 0;
- }
-
- if (req)
- mtp_req_put(dev, &dev->tx_idle, req);
-
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_CANCELED)
- r = -ECANCELED;
- else if (dev->state != STATE_OFFLINE)
- dev->state = STATE_READY;
- spin_unlock_irq(&dev->lock);
-
- DBG(cdev, "mtp_write returning %zd\n", r);
- return r;
-}
-
-/* read from a local file and write to USB */
-static void send_file_work(struct work_struct *data)
-{
- struct mtp_dev *dev = container_of(data, struct mtp_dev,
- send_file_work);
- struct usb_composite_dev *cdev = dev->cdev;
- struct usb_request *req = 0;
- struct mtp_data_header *header;
- struct file *filp;
- loff_t offset;
- int64_t count;
- int xfer, ret, hdr_size;
- int r = 0;
- int sendZLP = 0;
-
- /* read our parameters */
- smp_rmb();
- filp = dev->xfer_file;
- offset = dev->xfer_file_offset;
- count = dev->xfer_file_length;
-
- DBG(cdev, "send_file_work(%lld %lld)\n", offset, count);
-
- if (dev->xfer_send_header) {
- hdr_size = sizeof(struct mtp_data_header);
- count += hdr_size;
- } else {
- hdr_size = 0;
- }
-
- /* we need to send a zero length packet to signal the end of transfer
- * if the transfer size is aligned to a packet boundary.
- */
- if ((count & (dev->ep_in->maxpacket - 1)) == 0)
- sendZLP = 1;
-
- while (count > 0 || sendZLP) {
- /* so we exit after sending ZLP */
- if (count == 0)
- sendZLP = 0;
-
- /* get an idle tx request to use */
- req = 0;
- ret = wait_event_interruptible(dev->write_wq,
- (req = mtp_req_get(dev, &dev->tx_idle))
- || dev->state != STATE_BUSY);
- if (dev->state == STATE_CANCELED) {
- r = -ECANCELED;
- break;
- }
- if (!req) {
- r = ret;
- break;
- }
-
- if (count > MTP_BULK_BUFFER_SIZE)
- xfer = MTP_BULK_BUFFER_SIZE;
- else
- xfer = count;
-
- if (hdr_size) {
- /* prepend MTP data header */
- header = (struct mtp_data_header *)req->buf;
- header->length = __cpu_to_le32(count);
- header->type = __cpu_to_le16(2); /* data packet */
- header->command = __cpu_to_le16(dev->xfer_command);
- header->transaction_id =
- __cpu_to_le32(dev->xfer_transaction_id);
- }
-
- ret = vfs_read(filp, req->buf + hdr_size, xfer - hdr_size,
- &offset);
- if (ret < 0) {
- r = ret;
- break;
- }
- xfer = ret + hdr_size;
- hdr_size = 0;
-
- req->length = xfer;
- ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
- if (ret < 0) {
- DBG(cdev, "send_file_work: xfer error %d\n", ret);
- dev->state = STATE_ERROR;
- r = -EIO;
- break;
- }
-
- count -= xfer;
-
- /* zero this so we don't try to free it on error exit */
- req = 0;
- }
-
- if (req)
- mtp_req_put(dev, &dev->tx_idle, req);
-
- DBG(cdev, "send_file_work returning %d\n", r);
- /* write the result */
- dev->xfer_result = r;
- smp_wmb();
-}
-
-/* read from USB and write to a local file */
-static void receive_file_work(struct work_struct *data)
-{
- struct mtp_dev *dev = container_of(data, struct mtp_dev,
- receive_file_work);
- struct usb_composite_dev *cdev = dev->cdev;
- struct usb_request *read_req = NULL, *write_req = NULL;
- struct file *filp;
- loff_t offset;
- int64_t count;
- int ret, cur_buf = 0;
- int r = 0;
-
- /* read our parameters */
- smp_rmb();
- filp = dev->xfer_file;
- offset = dev->xfer_file_offset;
- count = dev->xfer_file_length;
-
- DBG(cdev, "receive_file_work(%lld)\n", count);
-
- while (count > 0 || write_req) {
- if (count > 0) {
- /* queue a request */
- read_req = dev->rx_req[cur_buf];
- cur_buf = (cur_buf + 1) % RX_REQ_MAX;
-
- read_req->length = (count > MTP_BULK_BUFFER_SIZE
- ? MTP_BULK_BUFFER_SIZE : count);
- dev->rx_done = 0;
- ret = usb_ep_queue(dev->ep_out, read_req, GFP_KERNEL);
- if (ret < 0) {
- r = -EIO;
- dev->state = STATE_ERROR;
- break;
- }
- }
-
- if (write_req) {
- DBG(cdev, "rx %p %d\n", write_req, write_req->actual);
- ret = vfs_write(filp, write_req->buf, write_req->actual,
- &offset);
- DBG(cdev, "vfs_write %d\n", ret);
- if (ret != write_req->actual) {
- r = -EIO;
- dev->state = STATE_ERROR;
- break;
- }
- write_req = NULL;
- }
-
- if (read_req) {
- /* wait for our last read to complete */
- ret = wait_event_interruptible(dev->read_wq,
- dev->rx_done || dev->state != STATE_BUSY);
- if (dev->state == STATE_CANCELED) {
- r = -ECANCELED;
- if (!dev->rx_done)
- usb_ep_dequeue(dev->ep_out, read_req);
- break;
- }
- /* if xfer_file_length is 0xFFFFFFFF, then we read until
- * we get a zero length packet
- */
- if (count != 0xFFFFFFFF)
- count -= read_req->actual;
- if (read_req->actual < read_req->length) {
- /*
- * short packet is used to signal EOF for
- * sizes > 4 gig
- */
- DBG(cdev, "got short packet\n");
- count = 0;
- }
-
- write_req = read_req;
- read_req = NULL;
- }
- }
-
- DBG(cdev, "receive_file_work returning %d\n", r);
- /* write the result */
- dev->xfer_result = r;
- smp_wmb();
-}
-
-static int mtp_send_event(struct mtp_dev *dev, struct mtp_event *event)
-{
- struct usb_request *req = NULL;
- int ret;
- int length = event->length;
-
- DBG(dev->cdev, "mtp_send_event(%zu)\n", event->length);
-
- if (length < 0 || length > INTR_BUFFER_SIZE)
- return -EINVAL;
- if (dev->state == STATE_OFFLINE)
- return -ENODEV;
-
- ret = wait_event_interruptible_timeout(dev->intr_wq,
- (req = mtp_req_get(dev, &dev->intr_idle)),
- msecs_to_jiffies(1000));
- if (!req)
- return -ETIME;
-
- if (copy_from_user(req->buf, (void __user *)event->data, length)) {
- mtp_req_put(dev, &dev->intr_idle, req);
- return -EFAULT;
- }
- req->length = length;
- ret = usb_ep_queue(dev->ep_intr, req, GFP_KERNEL);
- if (ret)
- mtp_req_put(dev, &dev->intr_idle, req);
-
- return ret;
-}
-
-static long mtp_ioctl(struct file *fp, unsigned code, unsigned long value)
-{
- struct mtp_dev *dev = fp->private_data;
- struct file *filp = NULL;
- int ret = -EINVAL;
-
- if (mtp_lock(&dev->ioctl_excl))
- return -EBUSY;
-
- switch (code) {
- case MTP_SEND_FILE:
- case MTP_RECEIVE_FILE:
- case MTP_SEND_FILE_WITH_HEADER:
- {
- struct mtp_file_range mfr;
- struct work_struct *work;
-
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_CANCELED) {
- /* report cancelation to userspace */
- dev->state = STATE_READY;
- spin_unlock_irq(&dev->lock);
- ret = -ECANCELED;
- goto out;
- }
- if (dev->state == STATE_OFFLINE) {
- spin_unlock_irq(&dev->lock);
- ret = -ENODEV;
- goto out;
- }
- dev->state = STATE_BUSY;
- spin_unlock_irq(&dev->lock);
-
- if (copy_from_user(&mfr, (void __user *)value, sizeof(mfr))) {
- ret = -EFAULT;
- goto fail;
- }
- /* hold a reference to the file while we are working with it */
- filp = fget(mfr.fd);
- if (!filp) {
- ret = -EBADF;
- goto fail;
- }
-
- /* write the parameters */
- dev->xfer_file = filp;
- dev->xfer_file_offset = mfr.offset;
- dev->xfer_file_length = mfr.length;
- smp_wmb();
-
- if (code == MTP_SEND_FILE_WITH_HEADER) {
- work = &dev->send_file_work;
- dev->xfer_send_header = 1;
- dev->xfer_command = mfr.command;
- dev->xfer_transaction_id = mfr.transaction_id;
- } else if (code == MTP_SEND_FILE) {
- work = &dev->send_file_work;
- dev->xfer_send_header = 0;
- } else {
- work = &dev->receive_file_work;
- }
-
- /* We do the file transfer on a work queue so it will run
- * in kernel context, which is necessary for vfs_read and
- * vfs_write to use our buffers in the kernel address space.
- */
- queue_work(dev->wq, work);
- /* wait for operation to complete */
- flush_workqueue(dev->wq);
- fput(filp);
-
- /* read the result */
- smp_rmb();
- ret = dev->xfer_result;
- break;
- }
- case MTP_SEND_EVENT:
- {
- struct mtp_event event;
- /* return here so we don't change dev->state below,
- * which would interfere with bulk transfer state.
- */
- if (copy_from_user(&event, (void __user *)value, sizeof(event)))
- ret = -EFAULT;
- else
- ret = mtp_send_event(dev, &event);
- goto out;
- }
- }
-
-fail:
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_CANCELED)
- ret = -ECANCELED;
- else if (dev->state != STATE_OFFLINE)
- dev->state = STATE_READY;
- spin_unlock_irq(&dev->lock);
-out:
- mtp_unlock(&dev->ioctl_excl);
- DBG(dev->cdev, "ioctl returning %d\n", ret);
- return ret;
-}
-
-static int mtp_open(struct inode *ip, struct file *fp)
-{
- printk(KERN_INFO "mtp_open\n");
- if (mtp_lock(&_mtp_dev->open_excl))
- return -EBUSY;
-
- /* clear any error condition */
- if (_mtp_dev->state != STATE_OFFLINE)
- _mtp_dev->state = STATE_READY;
-
- fp->private_data = _mtp_dev;
- return 0;
-}
-
-static int mtp_release(struct inode *ip, struct file *fp)
-{
- printk(KERN_INFO "mtp_release\n");
-
- mtp_unlock(&_mtp_dev->open_excl);
- return 0;
-}
-
-/* file operations for /dev/mtp_usb */
-static const struct file_operations mtp_fops = {
- .owner = THIS_MODULE,
- .read = mtp_read,
- .write = mtp_write,
- .unlocked_ioctl = mtp_ioctl,
- .open = mtp_open,
- .release = mtp_release,
-};
-
-static struct miscdevice mtp_device = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = mtp_shortname,
- .fops = &mtp_fops,
-};
-
-static int mtp_ctrlrequest(struct usb_composite_dev *cdev,
- const struct usb_ctrlrequest *ctrl)
-{
- struct mtp_dev *dev = _mtp_dev;
- int value = -EOPNOTSUPP;
- u16 w_index = le16_to_cpu(ctrl->wIndex);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u16 w_length = le16_to_cpu(ctrl->wLength);
- unsigned long flags;
-
- VDBG(cdev, "mtp_ctrlrequest "
- "%02x.%02x v%04x i%04x l%u\n",
- ctrl->bRequestType, ctrl->bRequest,
- w_value, w_index, w_length);
-
- /* Handle MTP OS string */
- if (ctrl->bRequestType ==
- (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE)
- && ctrl->bRequest == USB_REQ_GET_DESCRIPTOR
- && (w_value >> 8) == USB_DT_STRING
- && (w_value & 0xFF) == MTP_OS_STRING_ID) {
- value = (w_length < sizeof(mtp_os_string)
- ? w_length : sizeof(mtp_os_string));
- memcpy(cdev->req->buf, mtp_os_string, value);
- } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
- /* Handle MTP OS descriptor */
- DBG(cdev, "vendor request: %d index: %d value: %d length: %d\n",
- ctrl->bRequest, w_index, w_value, w_length);
-
- if (ctrl->bRequest == 1
- && (ctrl->bRequestType & USB_DIR_IN)
- && (w_index == 4 || w_index == 5)) {
- value = (w_length < sizeof(mtp_ext_config_desc) ?
- w_length : sizeof(mtp_ext_config_desc));
- memcpy(cdev->req->buf, &mtp_ext_config_desc, value);
- }
- } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
- DBG(cdev, "class request: %d index: %d value: %d length: %d\n",
- ctrl->bRequest, w_index, w_value, w_length);
-
- if (ctrl->bRequest == MTP_REQ_CANCEL && w_index == 0
- && w_value == 0) {
- DBG(cdev, "MTP_REQ_CANCEL\n");
-
- spin_lock_irqsave(&dev->lock, flags);
- if (dev->state == STATE_BUSY) {
- dev->state = STATE_CANCELED;
- wake_up(&dev->read_wq);
- wake_up(&dev->write_wq);
- }
- spin_unlock_irqrestore(&dev->lock, flags);
-
- /* We need to queue a request to read the remaining
- * bytes, but we don't actually need to look at
- * the contents.
- */
- value = w_length;
- } else if (ctrl->bRequest == MTP_REQ_GET_DEVICE_STATUS
- && w_index == 0 && w_value == 0) {
- struct mtp_device_status *status = cdev->req->buf;
- status->wLength =
- __constant_cpu_to_le16(sizeof(*status));
-
- DBG(cdev, "MTP_REQ_GET_DEVICE_STATUS\n");
- spin_lock_irqsave(&dev->lock, flags);
- /* device status is "busy" until we report
- * the cancelation to userspace
- */
- if (dev->state == STATE_CANCELED)
- status->wCode =
- __cpu_to_le16(MTP_RESPONSE_DEVICE_BUSY);
- else
- status->wCode =
- __cpu_to_le16(MTP_RESPONSE_OK);
- spin_unlock_irqrestore(&dev->lock, flags);
- value = sizeof(*status);
- }
- }
-
- /* respond with data transfer or status phase? */
- if (value >= 0) {
- int rc;
- cdev->req->zero = value < w_length;
- cdev->req->length = value;
- rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
- if (rc < 0)
- ERROR(cdev, "%s: response queue error\n", __func__);
- }
- return value;
-}
-
-static int
-mtp_function_bind(struct usb_configuration *c, struct usb_function *f)
-{
- struct usb_composite_dev *cdev = c->cdev;
- struct mtp_dev *dev = func_to_mtp(f);
- int id;
- int ret;
-
- dev->cdev = cdev;
- DBG(cdev, "mtp_function_bind dev: %p\n", dev);
-
- /* allocate interface ID(s) */
- id = usb_interface_id(c, f);
- if (id < 0)
- return id;
- mtp_interface_desc.bInterfaceNumber = id;
-
- if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) {
- ret = usb_string_id(c->cdev);
- if (ret < 0)
- return ret;
- mtp_string_defs[INTERFACE_STRING_INDEX].id = ret;
- mtp_interface_desc.iInterface = ret;
- }
- /* allocate endpoints */
- ret = mtp_create_bulk_endpoints(dev, &mtp_fullspeed_in_desc,
- &mtp_fullspeed_out_desc, &mtp_intr_desc);
- if (ret)
- return ret;
-
- /* support high speed hardware */
- if (gadget_is_dualspeed(c->cdev->gadget)) {
- mtp_highspeed_in_desc.bEndpointAddress =
- mtp_fullspeed_in_desc.bEndpointAddress;
- mtp_highspeed_out_desc.bEndpointAddress =
- mtp_fullspeed_out_desc.bEndpointAddress;
- }
-
- DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
- gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
- f->name, dev->ep_in->name, dev->ep_out->name);
- return 0;
-}
-
-static void
-mtp_function_unbind(struct usb_configuration *c, struct usb_function *f)
-{
- struct mtp_dev *dev = func_to_mtp(f);
- struct usb_request *req;
- int i;
-
- mtp_string_defs[INTERFACE_STRING_INDEX].id = 0;
- while ((req = mtp_req_get(dev, &dev->tx_idle)))
- mtp_request_free(req, dev->ep_in);
- for (i = 0; i < RX_REQ_MAX; i++)
- mtp_request_free(dev->rx_req[i], dev->ep_out);
- while ((req = mtp_req_get(dev, &dev->intr_idle)))
- mtp_request_free(req, dev->ep_intr);
- dev->state = STATE_OFFLINE;
-}
-
-static int mtp_function_set_alt(struct usb_function *f,
- unsigned intf, unsigned alt)
-{
- struct mtp_dev *dev = func_to_mtp(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- int ret;
-
- DBG(cdev, "mtp_function_set_alt intf: %d alt: %d\n", intf, alt);
-
- ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in);
- if (ret)
- return ret;
-
- ret = usb_ep_enable(dev->ep_in);
- if (ret)
- return ret;
-
- ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out);
- if (ret)
- return ret;
-
- ret = usb_ep_enable(dev->ep_out);
- if (ret) {
- usb_ep_disable(dev->ep_in);
- return ret;
- }
-
- ret = config_ep_by_speed(cdev->gadget, f, dev->ep_intr);
- if (ret)
- return ret;
-
- ret = usb_ep_enable(dev->ep_intr);
- if (ret) {
- usb_ep_disable(dev->ep_out);
- usb_ep_disable(dev->ep_in);
- return ret;
- }
- dev->state = STATE_READY;
-
- /* readers may be blocked waiting for us to go online */
- wake_up(&dev->read_wq);
- return 0;
-}
-
-static void mtp_function_disable(struct usb_function *f)
-{
- struct mtp_dev *dev = func_to_mtp(f);
- struct usb_composite_dev *cdev = dev->cdev;
-
- DBG(cdev, "mtp_function_disable\n");
- dev->state = STATE_OFFLINE;
- usb_ep_disable(dev->ep_in);
- usb_ep_disable(dev->ep_out);
- usb_ep_disable(dev->ep_intr);
-
- /* readers may be blocked waiting for us to go online */
- wake_up(&dev->read_wq);
-
- VDBG(cdev, "%s disabled\n", dev->function.name);
-}
-
-static int mtp_bind_config(struct usb_configuration *c, bool ptp_config)
-{
- struct mtp_dev *dev = _mtp_dev;
- int ret = 0;
-
- printk(KERN_INFO "mtp_bind_config\n");
-
- /* allocate a string ID for our interface */
- if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) {
- ret = usb_string_id(c->cdev);
- if (ret < 0)
- return ret;
- mtp_string_defs[INTERFACE_STRING_INDEX].id = ret;
- mtp_interface_desc.iInterface = ret;
- }
-
- dev->cdev = c->cdev;
- dev->function.name = DRIVER_NAME;
- dev->function.strings = mtp_strings;
- if (ptp_config) {
- dev->function.fs_descriptors = fs_ptp_descs;
- dev->function.hs_descriptors = hs_ptp_descs;
- } else {
- dev->function.fs_descriptors = fs_mtp_descs;
- dev->function.hs_descriptors = hs_mtp_descs;
- }
- dev->function.bind = mtp_function_bind;
- dev->function.unbind = mtp_function_unbind;
- dev->function.set_alt = mtp_function_set_alt;
- dev->function.disable = mtp_function_disable;
-
- return usb_add_function(c, &dev->function);
-}
-
-static int __mtp_setup(struct mtp_instance *fi_mtp)
-{
- struct mtp_dev *dev;
- int ret;
-
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-
- if (fi_mtp != NULL)
- fi_mtp->dev = dev;
-
- if (!dev)
- return -ENOMEM;
-
- spin_lock_init(&dev->lock);
- init_waitqueue_head(&dev->read_wq);
- init_waitqueue_head(&dev->write_wq);
- init_waitqueue_head(&dev->intr_wq);
- atomic_set(&dev->open_excl, 0);
- atomic_set(&dev->ioctl_excl, 0);
- INIT_LIST_HEAD(&dev->tx_idle);
- INIT_LIST_HEAD(&dev->intr_idle);
-
- dev->wq = create_singlethread_workqueue("f_mtp");
- if (!dev->wq) {
- ret = -ENOMEM;
- goto err1;
- }
- INIT_WORK(&dev->send_file_work, send_file_work);
- INIT_WORK(&dev->receive_file_work, receive_file_work);
-
- _mtp_dev = dev;
-
- ret = misc_register(&mtp_device);
- if (ret)
- goto err2;
-
- return 0;
-
-err2:
- destroy_workqueue(dev->wq);
-err1:
- _mtp_dev = NULL;
- kfree(dev);
- printk(KERN_ERR "mtp gadget driver failed to initialize\n");
- return ret;
-}
-
-static int mtp_setup(void)
-{
- return __mtp_setup(NULL);
-}
-
-static int mtp_setup_configfs(struct mtp_instance *fi_mtp)
-{
- return __mtp_setup(fi_mtp);
-}
-
-
-static void mtp_cleanup(void)
-{
- struct mtp_dev *dev = _mtp_dev;
-
- if (!dev)
- return;
-
- misc_deregister(&mtp_device);
- destroy_workqueue(dev->wq);
- _mtp_dev = NULL;
- kfree(dev);
-}
-
-static struct mtp_instance *to_mtp_instance(struct config_item *item)
-{
- return container_of(to_config_group(item), struct mtp_instance,
- func_inst.group);
-}
-
-static void mtp_attr_release(struct config_item *item)
-{
- struct mtp_instance *fi_mtp = to_mtp_instance(item);
- usb_put_function_instance(&fi_mtp->func_inst);
-}
-
-static struct configfs_item_operations mtp_item_ops = {
- .release = mtp_attr_release,
-};
-
-static struct config_item_type mtp_func_type = {
- .ct_item_ops = &mtp_item_ops,
- .ct_owner = THIS_MODULE,
-};
-
-
-static struct mtp_instance *to_fi_mtp(struct usb_function_instance *fi)
-{
- return container_of(fi, struct mtp_instance, func_inst);
-}
-
-static int mtp_set_inst_name(struct usb_function_instance *fi, const char *name)
-{
- struct mtp_instance *fi_mtp;
- char *ptr;
- int name_len;
-
- name_len = strlen(name) + 1;
- if (name_len > MAX_INST_NAME_LEN)
- return -ENAMETOOLONG;
-
- ptr = kstrndup(name, name_len, GFP_KERNEL);
- if (!ptr)
- return -ENOMEM;
-
- fi_mtp = to_fi_mtp(fi);
- fi_mtp->name = ptr;
-
- return 0;
-}
-
-static void mtp_free_inst(struct usb_function_instance *fi)
-{
- struct mtp_instance *fi_mtp;
-
- fi_mtp = to_fi_mtp(fi);
- kfree(fi_mtp->name);
- mtp_cleanup();
- kfree(fi_mtp);
-}
-
-struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config)
-{
- struct mtp_instance *fi_mtp;
- int ret = 0;
-
- fi_mtp = kzalloc(sizeof(*fi_mtp), GFP_KERNEL);
- if (!fi_mtp)
- return ERR_PTR(-ENOMEM);
- fi_mtp->func_inst.set_inst_name = mtp_set_inst_name;
- fi_mtp->func_inst.free_func_inst = mtp_free_inst;
-
- if (mtp_config) {
- ret = mtp_setup_configfs(fi_mtp);
- if (ret) {
- kfree(fi_mtp);
- pr_err("Error setting MTP\n");
- return ERR_PTR(ret);
- }
- } else
- fi_mtp->dev = _mtp_dev;
-
- config_group_init_type_name(&fi_mtp->func_inst.group,
- "", &mtp_func_type);
-
- return &fi_mtp->func_inst;
-}
-EXPORT_SYMBOL_GPL(alloc_inst_mtp_ptp);
-
-static struct usb_function_instance *mtp_alloc_inst(void)
-{
- return alloc_inst_mtp_ptp(true);
-}
-
-static int mtp_ctrlreq_configfs(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- return mtp_ctrlrequest(f->config->cdev, ctrl);
-}
-
-static void mtp_free(struct usb_function *f)
-{
- /*NO-OP: no function specific resource allocation in mtp_alloc*/
-}
-
-struct usb_function *function_alloc_mtp_ptp(struct usb_function_instance *fi,
- bool mtp_config)
-{
- struct mtp_instance *fi_mtp = to_fi_mtp(fi);
- struct mtp_dev *dev = fi_mtp->dev;
-
- dev->function.name = DRIVER_NAME;
- dev->function.strings = mtp_strings;
- if (mtp_config) {
- dev->function.fs_descriptors = fs_mtp_descs;
- dev->function.hs_descriptors = hs_mtp_descs;
- } else {
- dev->function.fs_descriptors = fs_ptp_descs;
- dev->function.hs_descriptors = hs_ptp_descs;
- }
- dev->function.bind = mtp_function_bind;
- dev->function.unbind = mtp_function_unbind;
- dev->function.set_alt = mtp_function_set_alt;
- dev->function.disable = mtp_function_disable;
- dev->function.setup = mtp_ctrlreq_configfs;
- dev->function.free_func = mtp_free;
-
- return &dev->function;
-}
-EXPORT_SYMBOL_GPL(function_alloc_mtp_ptp);
-
-static struct usb_function *mtp_alloc(struct usb_function_instance *fi)
-{
- return function_alloc_mtp_ptp(fi, true);
-}
-
-DECLARE_USB_FUNCTION_INIT(mtp, mtp_alloc_inst, mtp_alloc);
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * Copyright (C) 2014 Google, Inc.
- * Author: Badhri Jagan Sridharan <badhri@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-extern struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config);
-extern struct usb_function *function_alloc_mtp_ptp(
- struct usb_function_instance *fi, bool mtp_config);
+++ /dev/null
-/*
- * Gadget Function Driver for PTP
- *
- * Copyright (C) 2014 Google, Inc.
- * Author: Badhri Jagan Sridharan <badhri@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-
-#include <linux/configfs.h>
-#include <linux/usb/composite.h>
-
-#include "f_mtp.h"
-
-static struct usb_function_instance *ptp_alloc_inst(void)
-{
- return alloc_inst_mtp_ptp(false);
-}
-
-static struct usb_function *ptp_alloc(struct usb_function_instance *fi)
-{
- return function_alloc_mtp_ptp(fi, false);
-}
-
-DECLARE_USB_FUNCTION_INIT(ptp, ptp_alloc_inst, ptp_alloc);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Badhri Jagan Sridharan");
obj-$(CONFIG_USB_F_HID) += usb_f_hid.o
usb_f_printer-y := f_printer.o
obj-$(CONFIG_USB_F_PRINTER) += usb_f_printer.o
+usb_f_mtp-y := f_mtp.o
+obj-$(CONFIG_USB_F_MTP) += usb_f_mtp.o
+usb_f_ptp-y := f_ptp.o
+obj-$(CONFIG_USB_F_PTP) += usb_f_ptp.o
+usb_f_audio_source-y := f_audio_source.o
+obj-$(CONFIG_USB_F_AUDIO_SRC) += usb_f_audio_source.o
--- /dev/null
+/*
+ * Gadget Function Driver for USB audio source device
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/usb/audio.h>
+#include <linux/wait.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+
+#include <linux/usb.h>
+#include <linux/usb_usual.h>
+#include <linux/usb/ch9.h>
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#define SAMPLE_RATE 44100
+#define FRAMES_PER_MSEC (SAMPLE_RATE / 1000)
+
+#define IN_EP_MAX_PACKET_SIZE 256
+
+/* Number of requests to allocate */
+#define IN_EP_REQ_COUNT 4
+
+#define AUDIO_AC_INTERFACE 0
+#define AUDIO_AS_INTERFACE 1
+#define AUDIO_NUM_INTERFACES 2
+#define MAX_INST_NAME_LEN 40
+
+/* B.3.1 Standard AC Interface Descriptor */
+static struct usb_interface_descriptor ac_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
+};
+
+DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
+
+#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(AUDIO_NUM_INTERFACES)
+/* 1 input terminal, 1 output terminal and 1 feature unit */
+#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
+ + UAC_DT_INPUT_TERMINAL_SIZE + UAC_DT_OUTPUT_TERMINAL_SIZE \
+ + UAC_DT_FEATURE_UNIT_SIZE(0))
+/* B.3.2 Class-Specific AC Interface Descriptor */
+static struct uac1_ac_header_descriptor_2 ac_header_desc = {
+ .bLength = UAC_DT_AC_HEADER_LENGTH,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_HEADER,
+ .bcdADC = __constant_cpu_to_le16(0x0100),
+ .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
+ .bInCollection = AUDIO_NUM_INTERFACES,
+ .baInterfaceNr = {
+ [0] = AUDIO_AC_INTERFACE,
+ [1] = AUDIO_AS_INTERFACE,
+ }
+};
+
+#define INPUT_TERMINAL_ID 1
+static struct uac_input_terminal_descriptor input_terminal_desc = {
+ .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_INPUT_TERMINAL,
+ .bTerminalID = INPUT_TERMINAL_ID,
+ .wTerminalType = UAC_INPUT_TERMINAL_MICROPHONE,
+ .bAssocTerminal = 0,
+ .wChannelConfig = 0x3,
+};
+
+DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
+
+#define FEATURE_UNIT_ID 2
+static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
+ .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FEATURE_UNIT,
+ .bUnitID = FEATURE_UNIT_ID,
+ .bSourceID = INPUT_TERMINAL_ID,
+ .bControlSize = 2,
+};
+
+#define OUTPUT_TERMINAL_ID 3
+static struct uac1_output_terminal_descriptor output_terminal_desc = {
+ .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
+ .bTerminalID = OUTPUT_TERMINAL_ID,
+ .wTerminalType = UAC_TERMINAL_STREAMING,
+ .bAssocTerminal = FEATURE_UNIT_ID,
+ .bSourceID = FEATURE_UNIT_ID,
+};
+
+/* B.4.1 Standard AS Interface Descriptor */
+static struct usb_interface_descriptor as_interface_alt_0_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_interface_alt_1_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+/* B.4.2 Class-Specific AS Interface Descriptor */
+static struct uac1_as_header_descriptor as_header_desc = {
+ .bLength = UAC_DT_AS_HEADER_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_AS_GENERAL,
+ .bTerminalLink = INPUT_TERMINAL_ID,
+ .bDelay = 1,
+ .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
+};
+
+DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
+
+static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
+ .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FORMAT_TYPE,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+ .bSubframeSize = 2,
+ .bBitResolution = 16,
+ .bSamFreqType = 1,
+};
+
+/* Standard ISO IN Endpoint Descriptor for highspeed */
+static struct usb_endpoint_descriptor hs_as_in_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_SYNC_SYNC
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE),
+ .bInterval = 4, /* poll 1 per millisecond */
+};
+
+/* Standard ISO IN Endpoint Descriptor for highspeed */
+static struct usb_endpoint_descriptor fs_as_in_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_SYNC_SYNC
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE),
+ .bInterval = 1, /* poll 1 per millisecond */
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
+ .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+ .bDescriptorSubtype = UAC_EP_GENERAL,
+ .bmAttributes = 1,
+ .bLockDelayUnits = 1,
+ .wLockDelay = __constant_cpu_to_le16(1),
+};
+
+static struct usb_descriptor_header *hs_audio_desc[] = {
+ (struct usb_descriptor_header *)&ac_interface_desc,
+ (struct usb_descriptor_header *)&ac_header_desc,
+
+ (struct usb_descriptor_header *)&input_terminal_desc,
+ (struct usb_descriptor_header *)&output_terminal_desc,
+ (struct usb_descriptor_header *)&feature_unit_desc,
+
+ (struct usb_descriptor_header *)&as_interface_alt_0_desc,
+ (struct usb_descriptor_header *)&as_interface_alt_1_desc,
+ (struct usb_descriptor_header *)&as_header_desc,
+
+ (struct usb_descriptor_header *)&as_type_i_desc,
+
+ (struct usb_descriptor_header *)&hs_as_in_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *fs_audio_desc[] = {
+ (struct usb_descriptor_header *)&ac_interface_desc,
+ (struct usb_descriptor_header *)&ac_header_desc,
+
+ (struct usb_descriptor_header *)&input_terminal_desc,
+ (struct usb_descriptor_header *)&output_terminal_desc,
+ (struct usb_descriptor_header *)&feature_unit_desc,
+
+ (struct usb_descriptor_header *)&as_interface_alt_0_desc,
+ (struct usb_descriptor_header *)&as_interface_alt_1_desc,
+ (struct usb_descriptor_header *)&as_header_desc,
+
+ (struct usb_descriptor_header *)&as_type_i_desc,
+
+ (struct usb_descriptor_header *)&fs_as_in_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+static struct snd_pcm_hardware audio_hw_info = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BATCH |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .channels_min = 2,
+ .channels_max = 2,
+ .rate_min = SAMPLE_RATE,
+ .rate_max = SAMPLE_RATE,
+
+ .buffer_bytes_max = 1024 * 1024,
+ .period_bytes_min = 64,
+ .period_bytes_max = 512 * 1024,
+ .periods_min = 2,
+ .periods_max = 1024,
+};
+
+/*-------------------------------------------------------------------------*/
+
+struct audio_source_config {
+ int card;
+ int device;
+};
+
+struct audio_dev {
+ struct usb_function func;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ struct snd_pcm_substream *substream;
+
+ struct list_head idle_reqs;
+ struct usb_ep *in_ep;
+
+ spinlock_t lock;
+
+ /* beginning, end and current position in our buffer */
+ void *buffer_start;
+ void *buffer_end;
+ void *buffer_pos;
+
+ /* byte size of a "period" */
+ unsigned int period;
+ /* bytes sent since last call to snd_pcm_period_elapsed */
+ unsigned int period_offset;
+ /* time we started playing */
+ ktime_t start_time;
+ /* number of frames sent since start_time */
+ s64 frames_sent;
+ struct audio_source_config *config;
+};
+
+static inline struct audio_dev *func_to_audio(struct usb_function *f)
+{
+ return container_of(f, struct audio_dev, func);
+}
+
+/*-------------------------------------------------------------------------*/
+
+struct audio_source_instance {
+ struct usb_function_instance func_inst;
+ const char *name;
+ struct audio_source_config *config;
+ struct device *audio_device;
+};
+
+static void audio_source_attr_release(struct config_item *item);
+
+static struct configfs_item_operations audio_source_item_ops = {
+ .release = audio_source_attr_release,
+};
+
+static struct config_item_type audio_source_func_type = {
+ .ct_item_ops = &audio_source_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static ssize_t audio_source_pcm_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+
+static DEVICE_ATTR(pcm, S_IRUGO, audio_source_pcm_show, NULL);
+
+static struct device_attribute *audio_source_function_attributes[] = {
+ &dev_attr_pcm,
+ NULL
+};
+
+/*--------------------------------------------------------------------------*/
+
+static struct usb_request *audio_request_new(struct usb_ep *ep, int buffer_size)
+{
+ struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+ if (!req)
+ return NULL;
+
+ req->buf = kmalloc(buffer_size, GFP_KERNEL);
+ if (!req->buf) {
+ usb_ep_free_request(ep, req);
+ return NULL;
+ }
+ req->length = buffer_size;
+ return req;
+}
+
+static void audio_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+ if (req) {
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+ }
+}
+
+static void audio_req_put(struct audio_dev *audio, struct usb_request *req)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ list_add_tail(&req->list, &audio->idle_reqs);
+ spin_unlock_irqrestore(&audio->lock, flags);
+}
+
+static struct usb_request *audio_req_get(struct audio_dev *audio)
+{
+ unsigned long flags;
+ struct usb_request *req;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ if (list_empty(&audio->idle_reqs)) {
+ req = 0;
+ } else {
+ req = list_first_entry(&audio->idle_reqs, struct usb_request,
+ list);
+ list_del(&req->list);
+ }
+ spin_unlock_irqrestore(&audio->lock, flags);
+ return req;
+}
+
+/* send the appropriate number of packets to match our bitrate */
+static void audio_send(struct audio_dev *audio)
+{
+ struct snd_pcm_runtime *runtime;
+ struct usb_request *req;
+ int length, length1, length2, ret;
+ s64 msecs;
+ s64 frames;
+ ktime_t now;
+
+ /* audio->substream will be null if we have been closed */
+ if (!audio->substream)
+ return;
+ /* audio->buffer_pos will be null if we have been stopped */
+ if (!audio->buffer_pos)
+ return;
+
+ runtime = audio->substream->runtime;
+
+ /* compute number of frames to send */
+ now = ktime_get();
+ msecs = ktime_to_ns(now) - ktime_to_ns(audio->start_time);
+ do_div(msecs, 1000000);
+ frames = msecs * SAMPLE_RATE;
+ do_div(frames, 1000);
+
+ /* Readjust our frames_sent if we fall too far behind.
+ * If we get too far behind it is better to drop some frames than
+ * to keep sending data too fast in an attempt to catch up.
+ */
+ if (frames - audio->frames_sent > 10 * FRAMES_PER_MSEC)
+ audio->frames_sent = frames - FRAMES_PER_MSEC;
+
+ frames -= audio->frames_sent;
+
+ /* We need to send something to keep the pipeline going */
+ if (frames <= 0)
+ frames = FRAMES_PER_MSEC;
+
+ while (frames > 0) {
+ req = audio_req_get(audio);
+ if (!req)
+ break;
+
+ length = frames_to_bytes(runtime, frames);
+ if (length > IN_EP_MAX_PACKET_SIZE)
+ length = IN_EP_MAX_PACKET_SIZE;
+
+ if (audio->buffer_pos + length > audio->buffer_end)
+ length1 = audio->buffer_end - audio->buffer_pos;
+ else
+ length1 = length;
+ memcpy(req->buf, audio->buffer_pos, length1);
+ if (length1 < length) {
+ /* Wrap around and copy remaining length
+ * at beginning of buffer.
+ */
+ length2 = length - length1;
+ memcpy(req->buf + length1, audio->buffer_start,
+ length2);
+ audio->buffer_pos = audio->buffer_start + length2;
+ } else {
+ audio->buffer_pos += length1;
+ if (audio->buffer_pos >= audio->buffer_end)
+ audio->buffer_pos = audio->buffer_start;
+ }
+
+ req->length = length;
+ ret = usb_ep_queue(audio->in_ep, req, GFP_ATOMIC);
+ if (ret < 0) {
+ pr_err("usb_ep_queue failed ret: %d\n", ret);
+ audio_req_put(audio, req);
+ break;
+ }
+
+ frames -= bytes_to_frames(runtime, length);
+ audio->frames_sent += bytes_to_frames(runtime, length);
+ }
+}
+
+static void audio_control_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ /* nothing to do here */
+}
+
+static void audio_data_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct audio_dev *audio = req->context;
+
+ pr_debug("audio_data_complete req->status %d req->actual %d\n",
+ req->status, req->actual);
+
+ audio_req_put(audio, req);
+
+ if (!audio->buffer_start || req->status)
+ return;
+
+ audio->period_offset += req->actual;
+ if (audio->period_offset >= audio->period) {
+ snd_pcm_period_elapsed(audio->substream);
+ audio->period_offset = 0;
+ }
+ audio_send(audio);
+}
+
+static int audio_set_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ int value = -EOPNOTSUPP;
+ u16 ep = le16_to_cpu(ctrl->wIndex);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+
+ pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ switch (ctrl->bRequest) {
+ case UAC_SET_CUR:
+ case UAC_SET_MIN:
+ case UAC_SET_MAX:
+ case UAC_SET_RES:
+ value = len;
+ break;
+ default:
+ break;
+ }
+
+ return value;
+}
+
+static int audio_get_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int value = -EOPNOTSUPP;
+ u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u8 *buf = cdev->req->buf;
+
+ pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ if (w_value == UAC_EP_CS_ATTR_SAMPLE_RATE << 8) {
+ switch (ctrl->bRequest) {
+ case UAC_GET_CUR:
+ case UAC_GET_MIN:
+ case UAC_GET_MAX:
+ case UAC_GET_RES:
+ /* return our sample rate */
+ buf[0] = (u8)SAMPLE_RATE;
+ buf[1] = (u8)(SAMPLE_RATE >> 8);
+ buf[2] = (u8)(SAMPLE_RATE >> 16);
+ value = 3;
+ break;
+ default:
+ break;
+ }
+ }
+
+ return value;
+}
+
+static int
+audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_request *req = cdev->req;
+ int value = -EOPNOTSUPP;
+ u16 w_index = le16_to_cpu(ctrl->wIndex);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+
+ /* composite driver infrastructure handles everything; interface
+ * activation uses set_alt().
+ */
+ switch (ctrl->bRequestType) {
+ case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
+ value = audio_set_endpoint_req(f, ctrl);
+ break;
+
+ case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
+ value = audio_get_endpoint_req(f, ctrl);
+ break;
+ }
+
+ /* respond with data transfer or status phase? */
+ if (value >= 0) {
+ pr_debug("audio req%02x.%02x v%04x i%04x l%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ req->zero = 0;
+ req->length = value;
+ req->complete = audio_control_complete;
+ value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+ if (value < 0)
+ pr_err("audio response on err %d\n", value);
+ }
+
+ /* device either stalls (value < 0) or reports success */
+ return value;
+}
+
+static int audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct audio_dev *audio = func_to_audio(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int ret;
+
+ pr_debug("audio_set_alt intf %d, alt %d\n", intf, alt);
+
+ ret = config_ep_by_speed(cdev->gadget, f, audio->in_ep);
+ if (ret)
+ return ret;
+
+ usb_ep_enable(audio->in_ep);
+ return 0;
+}
+
+static void audio_disable(struct usb_function *f)
+{
+ struct audio_dev *audio = func_to_audio(f);
+
+ pr_debug("audio_disable\n");
+ usb_ep_disable(audio->in_ep);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void audio_build_desc(struct audio_dev *audio)
+{
+ u8 *sam_freq;
+ int rate;
+
+ /* Set channel numbers */
+ input_terminal_desc.bNrChannels = 2;
+ as_type_i_desc.bNrChannels = 2;
+
+ /* Set sample rates */
+ rate = SAMPLE_RATE;
+ sam_freq = as_type_i_desc.tSamFreq[0];
+ memcpy(sam_freq, &rate, 3);
+}
+
+
+static int snd_card_setup(struct usb_configuration *c,
+ struct audio_source_config *config);
+static struct audio_source_instance *to_fi_audio_source(
+ const struct usb_function_instance *fi);
+
+
+/* audio function driver setup/binding */
+static int
+audio_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct audio_dev *audio = func_to_audio(f);
+ int status;
+ struct usb_ep *ep;
+ struct usb_request *req;
+ int i;
+ int err;
+
+ if (IS_ENABLED(CONFIG_USB_CONFIGFS)) {
+ struct audio_source_instance *fi_audio =
+ to_fi_audio_source(f->fi);
+ struct audio_source_config *config =
+ fi_audio->config;
+
+ err = snd_card_setup(c, config);
+ if (err)
+ return err;
+ }
+
+ audio_build_desc(audio);
+
+ /* allocate instance-specific interface IDs, and patch descriptors */
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ ac_interface_desc.bInterfaceNumber = status;
+
+ /* AUDIO_AC_INTERFACE */
+ ac_header_desc.baInterfaceNr[0] = status;
+
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ as_interface_alt_0_desc.bInterfaceNumber = status;
+ as_interface_alt_1_desc.bInterfaceNumber = status;
+
+ /* AUDIO_AS_INTERFACE */
+ ac_header_desc.baInterfaceNr[1] = status;
+
+ status = -ENODEV;
+
+ /* allocate our endpoint */
+ ep = usb_ep_autoconfig(cdev->gadget, &fs_as_in_ep_desc);
+ if (!ep)
+ goto fail;
+ audio->in_ep = ep;
+ ep->driver_data = audio; /* claim */
+
+ if (gadget_is_dualspeed(c->cdev->gadget))
+ hs_as_in_ep_desc.bEndpointAddress =
+ fs_as_in_ep_desc.bEndpointAddress;
+
+ f->fs_descriptors = fs_audio_desc;
+ f->hs_descriptors = hs_audio_desc;
+
+ for (i = 0, status = 0; i < IN_EP_REQ_COUNT && status == 0; i++) {
+ req = audio_request_new(ep, IN_EP_MAX_PACKET_SIZE);
+ if (req) {
+ req->context = audio;
+ req->complete = audio_data_complete;
+ audio_req_put(audio, req);
+ } else
+ status = -ENOMEM;
+ }
+
+fail:
+ return status;
+}
+
+static void
+audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct audio_dev *audio = func_to_audio(f);
+ struct usb_request *req;
+
+ while ((req = audio_req_get(audio)))
+ audio_request_free(req, audio->in_ep);
+
+ snd_card_free_when_closed(audio->card);
+ audio->card = NULL;
+ audio->pcm = NULL;
+ audio->substream = NULL;
+ audio->in_ep = NULL;
+
+ if (IS_ENABLED(CONFIG_USB_CONFIGFS)) {
+ struct audio_source_instance *fi_audio =
+ to_fi_audio_source(f->fi);
+ struct audio_source_config *config =
+ fi_audio->config;
+
+ config->card = -1;
+ config->device = -1;
+ }
+}
+
+static void audio_pcm_playback_start(struct audio_dev *audio)
+{
+ audio->start_time = ktime_get();
+ audio->frames_sent = 0;
+ audio_send(audio);
+}
+
+static void audio_pcm_playback_stop(struct audio_dev *audio)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ audio->buffer_start = 0;
+ audio->buffer_end = 0;
+ audio->buffer_pos = 0;
+ spin_unlock_irqrestore(&audio->lock, flags);
+}
+
+static int audio_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct audio_dev *audio = substream->private_data;
+
+ runtime->private_data = audio;
+ runtime->hw = audio_hw_info;
+ snd_pcm_limit_hw_rates(runtime);
+ runtime->hw.channels_max = 2;
+
+ audio->substream = substream;
+ return 0;
+}
+
+static int audio_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct audio_dev *audio = substream->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ audio->substream = NULL;
+ spin_unlock_irqrestore(&audio->lock, flags);
+
+ return 0;
+}
+
+static int audio_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ unsigned int channels = params_channels(params);
+ unsigned int rate = params_rate(params);
+
+ if (rate != SAMPLE_RATE)
+ return -EINVAL;
+ if (channels != 2)
+ return -EINVAL;
+
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(params));
+}
+
+static int audio_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int audio_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct audio_dev *audio = runtime->private_data;
+
+ audio->period = snd_pcm_lib_period_bytes(substream);
+ audio->period_offset = 0;
+ audio->buffer_start = runtime->dma_area;
+ audio->buffer_end = audio->buffer_start
+ + snd_pcm_lib_buffer_bytes(substream);
+ audio->buffer_pos = audio->buffer_start;
+
+ return 0;
+}
+
+static snd_pcm_uframes_t audio_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct audio_dev *audio = runtime->private_data;
+ ssize_t bytes = audio->buffer_pos - audio->buffer_start;
+
+ /* return offset of next frame to fill in our buffer */
+ return bytes_to_frames(runtime, bytes);
+}
+
+static int audio_pcm_playback_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ struct audio_dev *audio = substream->runtime->private_data;
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ audio_pcm_playback_start(audio);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ audio_pcm_playback_stop(audio);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static struct audio_dev _audio_dev = {
+ .func = {
+ .name = "audio_source",
+ .bind = audio_bind,
+ .unbind = audio_unbind,
+ .set_alt = audio_set_alt,
+ .setup = audio_setup,
+ .disable = audio_disable,
+ },
+ .lock = __SPIN_LOCK_UNLOCKED(_audio_dev.lock),
+ .idle_reqs = LIST_HEAD_INIT(_audio_dev.idle_reqs),
+};
+
+static struct snd_pcm_ops audio_playback_ops = {
+ .open = audio_pcm_open,
+ .close = audio_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = audio_pcm_hw_params,
+ .hw_free = audio_pcm_hw_free,
+ .prepare = audio_pcm_prepare,
+ .trigger = audio_pcm_playback_trigger,
+ .pointer = audio_pcm_pointer,
+};
+
+int audio_source_bind_config(struct usb_configuration *c,
+ struct audio_source_config *config)
+{
+ struct audio_dev *audio;
+ int err;
+
+ config->card = -1;
+ config->device = -1;
+
+ audio = &_audio_dev;
+
+ err = snd_card_setup(c, config);
+ if (err)
+ return err;
+
+ err = usb_add_function(c, &audio->func);
+ if (err)
+ goto add_fail;
+
+ return 0;
+
+add_fail:
+ snd_card_free(audio->card);
+ return err;
+}
+
+static int snd_card_setup(struct usb_configuration *c,
+ struct audio_source_config *config)
+{
+ struct audio_dev *audio;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ int err;
+
+ audio = &_audio_dev;
+
+ err = snd_card_new(&c->cdev->gadget->dev,
+ SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, 0, &card);
+ if (err)
+ return err;
+
+ err = snd_pcm_new(card, "USB audio source", 0, 1, 0, &pcm);
+ if (err)
+ goto pcm_fail;
+
+ pcm->private_data = audio;
+ pcm->info_flags = 0;
+ audio->pcm = pcm;
+
+ strlcpy(pcm->name, "USB gadget audio", sizeof(pcm->name));
+
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &audio_playback_ops);
+ snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+ NULL, 0, 64 * 1024);
+
+ strlcpy(card->driver, "audio_source", sizeof(card->driver));
+ strlcpy(card->shortname, card->driver, sizeof(card->shortname));
+ strlcpy(card->longname, "USB accessory audio source",
+ sizeof(card->longname));
+
+ err = snd_card_register(card);
+ if (err)
+ goto register_fail;
+
+ config->card = pcm->card->number;
+ config->device = pcm->device;
+ audio->card = card;
+ return 0;
+
+register_fail:
+pcm_fail:
+ snd_card_free(audio->card);
+ return err;
+}
+
+static struct audio_source_instance *to_audio_source_instance(
+ struct config_item *item)
+{
+ return container_of(to_config_group(item), struct audio_source_instance,
+ func_inst.group);
+}
+
+static struct audio_source_instance *to_fi_audio_source(
+ const struct usb_function_instance *fi)
+{
+ return container_of(fi, struct audio_source_instance, func_inst);
+}
+
+static void audio_source_attr_release(struct config_item *item)
+{
+ struct audio_source_instance *fi_audio = to_audio_source_instance(item);
+
+ usb_put_function_instance(&fi_audio->func_inst);
+}
+
+static int audio_source_set_inst_name(struct usb_function_instance *fi,
+ const char *name)
+{
+ struct audio_source_instance *fi_audio;
+ char *ptr;
+ int name_len;
+
+ name_len = strlen(name) + 1;
+ if (name_len > MAX_INST_NAME_LEN)
+ return -ENAMETOOLONG;
+
+ ptr = kstrndup(name, name_len, GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ fi_audio = to_fi_audio_source(fi);
+ fi_audio->name = ptr;
+
+ return 0;
+}
+
+static void audio_source_free_inst(struct usb_function_instance *fi)
+{
+ struct audio_source_instance *fi_audio;
+
+ fi_audio = to_fi_audio_source(fi);
+ device_destroy(fi_audio->audio_device->class,
+ fi_audio->audio_device->devt);
+ kfree(fi_audio->name);
+ kfree(fi_audio->config);
+}
+
+static ssize_t audio_source_pcm_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct audio_source_instance *fi_audio = dev_get_drvdata(dev);
+ struct audio_source_config *config = fi_audio->config;
+
+ /* print PCM card and device numbers */
+ return sprintf(buf, "%d %d\n", config->card, config->device);
+}
+
+struct device *create_function_device(char *name);
+
+static struct usb_function_instance *audio_source_alloc_inst(void)
+{
+ struct audio_source_instance *fi_audio;
+ struct device_attribute **attrs;
+ struct device_attribute *attr;
+ struct device *dev;
+ void *err_ptr;
+ int err = 0;
+
+ fi_audio = kzalloc(sizeof(*fi_audio), GFP_KERNEL);
+ if (!fi_audio)
+ return ERR_PTR(-ENOMEM);
+
+ fi_audio->func_inst.set_inst_name = audio_source_set_inst_name;
+ fi_audio->func_inst.free_func_inst = audio_source_free_inst;
+
+ fi_audio->config = kzalloc(sizeof(struct audio_source_config),
+ GFP_KERNEL);
+ if (!fi_audio->config) {
+ err_ptr = ERR_PTR(-ENOMEM);
+ goto fail_audio;
+ }
+
+ config_group_init_type_name(&fi_audio->func_inst.group, "",
+ &audio_source_func_type);
+ dev = create_function_device("f_audio_source");
+
+ if (IS_ERR(dev)) {
+ err_ptr = dev;
+ goto fail_audio_config;
+ }
+
+ fi_audio->config->card = -1;
+ fi_audio->config->device = -1;
+ fi_audio->audio_device = dev;
+
+ attrs = audio_source_function_attributes;
+ if (attrs) {
+ while ((attr = *attrs++) && !err)
+ err = device_create_file(dev, attr);
+ if (err) {
+ err_ptr = ERR_PTR(-EINVAL);
+ goto fail_device;
+ }
+ }
+
+ dev_set_drvdata(dev, fi_audio);
+ _audio_dev.config = fi_audio->config;
+
+ return &fi_audio->func_inst;
+
+fail_device:
+ device_destroy(dev->class, dev->devt);
+fail_audio_config:
+ kfree(fi_audio->config);
+fail_audio:
+ kfree(fi_audio);
+ return err_ptr;
+
+}
+
+static struct usb_function *audio_source_alloc(struct usb_function_instance *fi)
+{
+ return &_audio_dev.func;
+}
+
+DECLARE_USB_FUNCTION_INIT(audio_source, audio_source_alloc_inst,
+ audio_source_alloc);
+MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * Gadget Function Driver for MTP
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* #define DEBUG */
+/* #define VERBOSE_DEBUG */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+
+#include <linux/types.h>
+#include <linux/file.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+
+#include <linux/usb.h>
+#include <linux/usb_usual.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/f_mtp.h>
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+
+#include "configfs.h"
+
+#define MTP_BULK_BUFFER_SIZE 16384
+#define INTR_BUFFER_SIZE 28
+#define MAX_INST_NAME_LEN 40
+
+/* String IDs */
+#define INTERFACE_STRING_INDEX 0
+
+/* values for mtp_dev.state */
+#define STATE_OFFLINE 0 /* initial state, disconnected */
+#define STATE_READY 1 /* ready for userspace calls */
+#define STATE_BUSY 2 /* processing userspace calls */
+#define STATE_CANCELED 3 /* transaction canceled by host */
+#define STATE_ERROR 4 /* error from completion routine */
+
+/* number of tx and rx requests to allocate */
+#define TX_REQ_MAX 4
+#define RX_REQ_MAX 2
+#define INTR_REQ_MAX 5
+
+/* ID for Microsoft MTP OS String */
+#define MTP_OS_STRING_ID 0xEE
+
+/* MTP class reqeusts */
+#define MTP_REQ_CANCEL 0x64
+#define MTP_REQ_GET_EXT_EVENT_DATA 0x65
+#define MTP_REQ_RESET 0x66
+#define MTP_REQ_GET_DEVICE_STATUS 0x67
+
+/* constants for device status */
+#define MTP_RESPONSE_OK 0x2001
+#define MTP_RESPONSE_DEVICE_BUSY 0x2019
+#define DRIVER_NAME "mtp"
+
+static const char mtp_shortname[] = DRIVER_NAME "_usb";
+
+struct mtp_dev {
+ struct usb_function function;
+ struct usb_composite_dev *cdev;
+ spinlock_t lock;
+
+ struct usb_ep *ep_in;
+ struct usb_ep *ep_out;
+ struct usb_ep *ep_intr;
+
+ int state;
+
+ /* synchronize access to our device file */
+ atomic_t open_excl;
+ /* to enforce only one ioctl at a time */
+ atomic_t ioctl_excl;
+
+ struct list_head tx_idle;
+ struct list_head intr_idle;
+
+ wait_queue_head_t read_wq;
+ wait_queue_head_t write_wq;
+ wait_queue_head_t intr_wq;
+ struct usb_request *rx_req[RX_REQ_MAX];
+ int rx_done;
+
+ /* for processing MTP_SEND_FILE, MTP_RECEIVE_FILE and
+ * MTP_SEND_FILE_WITH_HEADER ioctls on a work queue
+ */
+ struct workqueue_struct *wq;
+ struct work_struct send_file_work;
+ struct work_struct receive_file_work;
+ struct file *xfer_file;
+ loff_t xfer_file_offset;
+ int64_t xfer_file_length;
+ unsigned xfer_send_header;
+ uint16_t xfer_command;
+ uint32_t xfer_transaction_id;
+ int xfer_result;
+};
+
+static struct usb_interface_descriptor mtp_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bNumEndpoints = 3,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
+ .bInterfaceProtocol = 0,
+};
+
+static struct usb_interface_descriptor ptp_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bNumEndpoints = 3,
+ .bInterfaceClass = USB_CLASS_STILL_IMAGE,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 1,
+};
+
+static struct usb_endpoint_descriptor mtp_highspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor mtp_highspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor mtp_fullspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor mtp_fullspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor mtp_intr_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = __constant_cpu_to_le16(INTR_BUFFER_SIZE),
+ .bInterval = 6,
+};
+
+static struct usb_descriptor_header *fs_mtp_descs[] = {
+ (struct usb_descriptor_header *) &mtp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_mtp_descs[] = {
+ (struct usb_descriptor_header *) &mtp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *fs_ptp_descs[] = {
+ (struct usb_descriptor_header *) &ptp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_ptp_descs[] = {
+ (struct usb_descriptor_header *) &ptp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_string mtp_string_defs[] = {
+ /* Naming interface "MTP" so libmtp will recognize us */
+ [INTERFACE_STRING_INDEX].s = "MTP",
+ { }, /* end of list */
+};
+
+static struct usb_gadget_strings mtp_string_table = {
+ .language = 0x0409, /* en-US */
+ .strings = mtp_string_defs,
+};
+
+static struct usb_gadget_strings *mtp_strings[] = {
+ &mtp_string_table,
+ NULL,
+};
+
+/* Microsoft MTP OS String */
+static u8 mtp_os_string[] = {
+ 18, /* sizeof(mtp_os_string) */
+ USB_DT_STRING,
+ /* Signature field: "MSFT100" */
+ 'M', 0, 'S', 0, 'F', 0, 'T', 0, '1', 0, '0', 0, '0', 0,
+ /* vendor code */
+ 1,
+ /* padding */
+ 0
+};
+
+/* Microsoft Extended Configuration Descriptor Header Section */
+struct mtp_ext_config_desc_header {
+ __le32 dwLength;
+ __u16 bcdVersion;
+ __le16 wIndex;
+ __u8 bCount;
+ __u8 reserved[7];
+};
+
+/* Microsoft Extended Configuration Descriptor Function Section */
+struct mtp_ext_config_desc_function {
+ __u8 bFirstInterfaceNumber;
+ __u8 bInterfaceCount;
+ __u8 compatibleID[8];
+ __u8 subCompatibleID[8];
+ __u8 reserved[6];
+};
+
+/* MTP Extended Configuration Descriptor */
+struct {
+ struct mtp_ext_config_desc_header header;
+ struct mtp_ext_config_desc_function function;
+} mtp_ext_config_desc = {
+ .header = {
+ .dwLength = __constant_cpu_to_le32(sizeof(mtp_ext_config_desc)),
+ .bcdVersion = __constant_cpu_to_le16(0x0100),
+ .wIndex = __constant_cpu_to_le16(4),
+ .bCount = __constant_cpu_to_le16(1),
+ },
+ .function = {
+ .bFirstInterfaceNumber = 0,
+ .bInterfaceCount = 1,
+ .compatibleID = { 'M', 'T', 'P' },
+ },
+};
+
+struct mtp_device_status {
+ __le16 wLength;
+ __le16 wCode;
+};
+
+struct mtp_data_header {
+ /* length of packet, including this header */
+ __le32 length;
+ /* container type (2 for data packet) */
+ __le16 type;
+ /* MTP command code */
+ __le16 command;
+ /* MTP transaction ID */
+ __le32 transaction_id;
+};
+
+struct mtp_instance {
+ struct usb_function_instance func_inst;
+ const char *name;
+ struct mtp_dev *dev;
+};
+
+/* temporary variable used between mtp_open() and mtp_gadget_bind() */
+static struct mtp_dev *_mtp_dev;
+
+static inline struct mtp_dev *func_to_mtp(struct usb_function *f)
+{
+ return container_of(f, struct mtp_dev, function);
+}
+
+static struct usb_request *mtp_request_new(struct usb_ep *ep, int buffer_size)
+{
+ struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+ if (!req)
+ return NULL;
+
+ /* now allocate buffers for the requests */
+ req->buf = kmalloc(buffer_size, GFP_KERNEL);
+ if (!req->buf) {
+ usb_ep_free_request(ep, req);
+ return NULL;
+ }
+
+ return req;
+}
+
+static void mtp_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+ if (req) {
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+ }
+}
+
+static inline int mtp_lock(atomic_t *excl)
+{
+ if (atomic_inc_return(excl) == 1) {
+ return 0;
+ } else {
+ atomic_dec(excl);
+ return -1;
+ }
+}
+
+static inline void mtp_unlock(atomic_t *excl)
+{
+ atomic_dec(excl);
+}
+
+/* add a request to the tail of a list */
+static void mtp_req_put(struct mtp_dev *dev, struct list_head *head,
+ struct usb_request *req)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ list_add_tail(&req->list, head);
+ spin_unlock_irqrestore(&dev->lock, flags);
+}
+
+/* remove a request from the head of a list */
+static struct usb_request
+*mtp_req_get(struct mtp_dev *dev, struct list_head *head)
+{
+ unsigned long flags;
+ struct usb_request *req;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ if (list_empty(head)) {
+ req = 0;
+ } else {
+ req = list_first_entry(head, struct usb_request, list);
+ list_del(&req->list);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return req;
+}
+
+static void mtp_complete_in(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ if (req->status != 0)
+ dev->state = STATE_ERROR;
+
+ mtp_req_put(dev, &dev->tx_idle, req);
+
+ wake_up(&dev->write_wq);
+}
+
+static void mtp_complete_out(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ dev->rx_done = 1;
+ if (req->status != 0)
+ dev->state = STATE_ERROR;
+
+ wake_up(&dev->read_wq);
+}
+
+static void mtp_complete_intr(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ if (req->status != 0)
+ dev->state = STATE_ERROR;
+
+ mtp_req_put(dev, &dev->intr_idle, req);
+
+ wake_up(&dev->intr_wq);
+}
+
+static int mtp_create_bulk_endpoints(struct mtp_dev *dev,
+ struct usb_endpoint_descriptor *in_desc,
+ struct usb_endpoint_descriptor *out_desc,
+ struct usb_endpoint_descriptor *intr_desc)
+{
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req;
+ struct usb_ep *ep;
+ int i;
+
+ DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
+
+ ep = usb_ep_autoconfig(cdev->gadget, in_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_in = ep;
+
+ ep = usb_ep_autoconfig(cdev->gadget, out_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for mtp ep_out got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_out = ep;
+
+ ep = usb_ep_autoconfig(cdev->gadget, intr_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_intr failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for mtp ep_intr got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_intr = ep;
+
+ /* now allocate requests for our endpoints */
+ for (i = 0; i < TX_REQ_MAX; i++) {
+ req = mtp_request_new(dev->ep_in, MTP_BULK_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = mtp_complete_in;
+ mtp_req_put(dev, &dev->tx_idle, req);
+ }
+ for (i = 0; i < RX_REQ_MAX; i++) {
+ req = mtp_request_new(dev->ep_out, MTP_BULK_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = mtp_complete_out;
+ dev->rx_req[i] = req;
+ }
+ for (i = 0; i < INTR_REQ_MAX; i++) {
+ req = mtp_request_new(dev->ep_intr, INTR_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = mtp_complete_intr;
+ mtp_req_put(dev, &dev->intr_idle, req);
+ }
+
+ return 0;
+
+fail:
+ pr_err("mtp_bind() could not allocate requests\n");
+ return -1;
+}
+
+static ssize_t mtp_read(struct file *fp, char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct mtp_dev *dev = fp->private_data;
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req;
+ ssize_t r = count;
+ unsigned xfer;
+ int ret = 0;
+
+ DBG(cdev, "mtp_read(%zu)\n", count);
+
+ if (count > MTP_BULK_BUFFER_SIZE)
+ return -EINVAL;
+
+ /* we will block until we're online */
+ DBG(cdev, "mtp_read: waiting for online state\n");
+ ret = wait_event_interruptible(dev->read_wq,
+ dev->state != STATE_OFFLINE);
+ if (ret < 0) {
+ r = ret;
+ goto done;
+ }
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED) {
+ /* report cancelation to userspace */
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+ return -ECANCELED;
+ }
+ dev->state = STATE_BUSY;
+ spin_unlock_irq(&dev->lock);
+
+requeue_req:
+ /* queue a request */
+ req = dev->rx_req[0];
+ req->length = count;
+ dev->rx_done = 0;
+ ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
+ if (ret < 0) {
+ r = -EIO;
+ goto done;
+ } else {
+ DBG(cdev, "rx %p queue\n", req);
+ }
+
+ /* wait for a request to complete */
+ ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
+ if (ret < 0) {
+ r = ret;
+ usb_ep_dequeue(dev->ep_out, req);
+ goto done;
+ }
+ if (dev->state == STATE_BUSY) {
+ /* If we got a 0-len packet, throw it back and try again. */
+ if (req->actual == 0)
+ goto requeue_req;
+
+ DBG(cdev, "rx %p %d\n", req, req->actual);
+ xfer = (req->actual < count) ? req->actual : count;
+ r = xfer;
+ if (copy_to_user(buf, req->buf, xfer))
+ r = -EFAULT;
+ } else
+ r = -EIO;
+
+done:
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED)
+ r = -ECANCELED;
+ else if (dev->state != STATE_OFFLINE)
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+
+ DBG(cdev, "mtp_read returning %zd\n", r);
+ return r;
+}
+
+static ssize_t mtp_write(struct file *fp, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct mtp_dev *dev = fp->private_data;
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req = 0;
+ ssize_t r = count;
+ unsigned xfer;
+ int sendZLP = 0;
+ int ret;
+
+ DBG(cdev, "mtp_write(%zu)\n", count);
+
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED) {
+ /* report cancelation to userspace */
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+ return -ECANCELED;
+ }
+ if (dev->state == STATE_OFFLINE) {
+ spin_unlock_irq(&dev->lock);
+ return -ENODEV;
+ }
+ dev->state = STATE_BUSY;
+ spin_unlock_irq(&dev->lock);
+
+ /* we need to send a zero length packet to signal the end of transfer
+ * if the transfer size is aligned to a packet boundary.
+ */
+ if ((count & (dev->ep_in->maxpacket - 1)) == 0)
+ sendZLP = 1;
+
+ while (count > 0 || sendZLP) {
+ /* so we exit after sending ZLP */
+ if (count == 0)
+ sendZLP = 0;
+
+ if (dev->state != STATE_BUSY) {
+ DBG(cdev, "mtp_write dev->error\n");
+ r = -EIO;
+ break;
+ }
+
+ /* get an idle tx request to use */
+ req = 0;
+ ret = wait_event_interruptible(dev->write_wq,
+ ((req = mtp_req_get(dev, &dev->tx_idle))
+ || dev->state != STATE_BUSY));
+ if (!req) {
+ r = ret;
+ break;
+ }
+
+ if (count > MTP_BULK_BUFFER_SIZE)
+ xfer = MTP_BULK_BUFFER_SIZE;
+ else
+ xfer = count;
+ if (xfer && copy_from_user(req->buf, buf, xfer)) {
+ r = -EFAULT;
+ break;
+ }
+
+ req->length = xfer;
+ ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
+ if (ret < 0) {
+ DBG(cdev, "mtp_write: xfer error %d\n", ret);
+ r = -EIO;
+ break;
+ }
+
+ buf += xfer;
+ count -= xfer;
+
+ /* zero this so we don't try to free it on error exit */
+ req = 0;
+ }
+
+ if (req)
+ mtp_req_put(dev, &dev->tx_idle, req);
+
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED)
+ r = -ECANCELED;
+ else if (dev->state != STATE_OFFLINE)
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+
+ DBG(cdev, "mtp_write returning %zd\n", r);
+ return r;
+}
+
+/* read from a local file and write to USB */
+static void send_file_work(struct work_struct *data)
+{
+ struct mtp_dev *dev = container_of(data, struct mtp_dev,
+ send_file_work);
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req = 0;
+ struct mtp_data_header *header;
+ struct file *filp;
+ loff_t offset;
+ int64_t count;
+ int xfer, ret, hdr_size;
+ int r = 0;
+ int sendZLP = 0;
+
+ /* read our parameters */
+ smp_rmb();
+ filp = dev->xfer_file;
+ offset = dev->xfer_file_offset;
+ count = dev->xfer_file_length;
+
+ DBG(cdev, "send_file_work(%lld %lld)\n", offset, count);
+
+ if (dev->xfer_send_header) {
+ hdr_size = sizeof(struct mtp_data_header);
+ count += hdr_size;
+ } else {
+ hdr_size = 0;
+ }
+
+ /* we need to send a zero length packet to signal the end of transfer
+ * if the transfer size is aligned to a packet boundary.
+ */
+ if ((count & (dev->ep_in->maxpacket - 1)) == 0)
+ sendZLP = 1;
+
+ while (count > 0 || sendZLP) {
+ /* so we exit after sending ZLP */
+ if (count == 0)
+ sendZLP = 0;
+
+ /* get an idle tx request to use */
+ req = 0;
+ ret = wait_event_interruptible(dev->write_wq,
+ (req = mtp_req_get(dev, &dev->tx_idle))
+ || dev->state != STATE_BUSY);
+ if (dev->state == STATE_CANCELED) {
+ r = -ECANCELED;
+ break;
+ }
+ if (!req) {
+ r = ret;
+ break;
+ }
+
+ if (count > MTP_BULK_BUFFER_SIZE)
+ xfer = MTP_BULK_BUFFER_SIZE;
+ else
+ xfer = count;
+
+ if (hdr_size) {
+ /* prepend MTP data header */
+ header = (struct mtp_data_header *)req->buf;
+ header->length = __cpu_to_le32(count);
+ header->type = __cpu_to_le16(2); /* data packet */
+ header->command = __cpu_to_le16(dev->xfer_command);
+ header->transaction_id =
+ __cpu_to_le32(dev->xfer_transaction_id);
+ }
+
+ ret = vfs_read(filp, req->buf + hdr_size, xfer - hdr_size,
+ &offset);
+ if (ret < 0) {
+ r = ret;
+ break;
+ }
+ xfer = ret + hdr_size;
+ hdr_size = 0;
+
+ req->length = xfer;
+ ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
+ if (ret < 0) {
+ DBG(cdev, "send_file_work: xfer error %d\n", ret);
+ dev->state = STATE_ERROR;
+ r = -EIO;
+ break;
+ }
+
+ count -= xfer;
+
+ /* zero this so we don't try to free it on error exit */
+ req = 0;
+ }
+
+ if (req)
+ mtp_req_put(dev, &dev->tx_idle, req);
+
+ DBG(cdev, "send_file_work returning %d\n", r);
+ /* write the result */
+ dev->xfer_result = r;
+ smp_wmb();
+}
+
+/* read from USB and write to a local file */
+static void receive_file_work(struct work_struct *data)
+{
+ struct mtp_dev *dev = container_of(data, struct mtp_dev,
+ receive_file_work);
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *read_req = NULL, *write_req = NULL;
+ struct file *filp;
+ loff_t offset;
+ int64_t count;
+ int ret, cur_buf = 0;
+ int r = 0;
+
+ /* read our parameters */
+ smp_rmb();
+ filp = dev->xfer_file;
+ offset = dev->xfer_file_offset;
+ count = dev->xfer_file_length;
+
+ DBG(cdev, "receive_file_work(%lld)\n", count);
+
+ while (count > 0 || write_req) {
+ if (count > 0) {
+ /* queue a request */
+ read_req = dev->rx_req[cur_buf];
+ cur_buf = (cur_buf + 1) % RX_REQ_MAX;
+
+ read_req->length = (count > MTP_BULK_BUFFER_SIZE
+ ? MTP_BULK_BUFFER_SIZE : count);
+ dev->rx_done = 0;
+ ret = usb_ep_queue(dev->ep_out, read_req, GFP_KERNEL);
+ if (ret < 0) {
+ r = -EIO;
+ dev->state = STATE_ERROR;
+ break;
+ }
+ }
+
+ if (write_req) {
+ DBG(cdev, "rx %p %d\n", write_req, write_req->actual);
+ ret = vfs_write(filp, write_req->buf, write_req->actual,
+ &offset);
+ DBG(cdev, "vfs_write %d\n", ret);
+ if (ret != write_req->actual) {
+ r = -EIO;
+ dev->state = STATE_ERROR;
+ break;
+ }
+ write_req = NULL;
+ }
+
+ if (read_req) {
+ /* wait for our last read to complete */
+ ret = wait_event_interruptible(dev->read_wq,
+ dev->rx_done || dev->state != STATE_BUSY);
+ if (dev->state == STATE_CANCELED) {
+ r = -ECANCELED;
+ if (!dev->rx_done)
+ usb_ep_dequeue(dev->ep_out, read_req);
+ break;
+ }
+ /* if xfer_file_length is 0xFFFFFFFF, then we read until
+ * we get a zero length packet
+ */
+ if (count != 0xFFFFFFFF)
+ count -= read_req->actual;
+ if (read_req->actual < read_req->length) {
+ /*
+ * short packet is used to signal EOF for
+ * sizes > 4 gig
+ */
+ DBG(cdev, "got short packet\n");
+ count = 0;
+ }
+
+ write_req = read_req;
+ read_req = NULL;
+ }
+ }
+
+ DBG(cdev, "receive_file_work returning %d\n", r);
+ /* write the result */
+ dev->xfer_result = r;
+ smp_wmb();
+}
+
+static int mtp_send_event(struct mtp_dev *dev, struct mtp_event *event)
+{
+ struct usb_request *req = NULL;
+ int ret;
+ int length = event->length;
+
+ DBG(dev->cdev, "mtp_send_event(%zu)\n", event->length);
+
+ if (length < 0 || length > INTR_BUFFER_SIZE)
+ return -EINVAL;
+ if (dev->state == STATE_OFFLINE)
+ return -ENODEV;
+
+ ret = wait_event_interruptible_timeout(dev->intr_wq,
+ (req = mtp_req_get(dev, &dev->intr_idle)),
+ msecs_to_jiffies(1000));
+ if (!req)
+ return -ETIME;
+
+ if (copy_from_user(req->buf, (void __user *)event->data, length)) {
+ mtp_req_put(dev, &dev->intr_idle, req);
+ return -EFAULT;
+ }
+ req->length = length;
+ ret = usb_ep_queue(dev->ep_intr, req, GFP_KERNEL);
+ if (ret)
+ mtp_req_put(dev, &dev->intr_idle, req);
+
+ return ret;
+}
+
+static long mtp_ioctl(struct file *fp, unsigned code, unsigned long value)
+{
+ struct mtp_dev *dev = fp->private_data;
+ struct file *filp = NULL;
+ int ret = -EINVAL;
+
+ if (mtp_lock(&dev->ioctl_excl))
+ return -EBUSY;
+
+ switch (code) {
+ case MTP_SEND_FILE:
+ case MTP_RECEIVE_FILE:
+ case MTP_SEND_FILE_WITH_HEADER:
+ {
+ struct mtp_file_range mfr;
+ struct work_struct *work;
+
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED) {
+ /* report cancelation to userspace */
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+ ret = -ECANCELED;
+ goto out;
+ }
+ if (dev->state == STATE_OFFLINE) {
+ spin_unlock_irq(&dev->lock);
+ ret = -ENODEV;
+ goto out;
+ }
+ dev->state = STATE_BUSY;
+ spin_unlock_irq(&dev->lock);
+
+ if (copy_from_user(&mfr, (void __user *)value, sizeof(mfr))) {
+ ret = -EFAULT;
+ goto fail;
+ }
+ /* hold a reference to the file while we are working with it */
+ filp = fget(mfr.fd);
+ if (!filp) {
+ ret = -EBADF;
+ goto fail;
+ }
+
+ /* write the parameters */
+ dev->xfer_file = filp;
+ dev->xfer_file_offset = mfr.offset;
+ dev->xfer_file_length = mfr.length;
+ smp_wmb();
+
+ if (code == MTP_SEND_FILE_WITH_HEADER) {
+ work = &dev->send_file_work;
+ dev->xfer_send_header = 1;
+ dev->xfer_command = mfr.command;
+ dev->xfer_transaction_id = mfr.transaction_id;
+ } else if (code == MTP_SEND_FILE) {
+ work = &dev->send_file_work;
+ dev->xfer_send_header = 0;
+ } else {
+ work = &dev->receive_file_work;
+ }
+
+ /* We do the file transfer on a work queue so it will run
+ * in kernel context, which is necessary for vfs_read and
+ * vfs_write to use our buffers in the kernel address space.
+ */
+ queue_work(dev->wq, work);
+ /* wait for operation to complete */
+ flush_workqueue(dev->wq);
+ fput(filp);
+
+ /* read the result */
+ smp_rmb();
+ ret = dev->xfer_result;
+ break;
+ }
+ case MTP_SEND_EVENT:
+ {
+ struct mtp_event event;
+ /* return here so we don't change dev->state below,
+ * which would interfere with bulk transfer state.
+ */
+ if (copy_from_user(&event, (void __user *)value, sizeof(event)))
+ ret = -EFAULT;
+ else
+ ret = mtp_send_event(dev, &event);
+ goto out;
+ }
+ }
+
+fail:
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED)
+ ret = -ECANCELED;
+ else if (dev->state != STATE_OFFLINE)
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+out:
+ mtp_unlock(&dev->ioctl_excl);
+ DBG(dev->cdev, "ioctl returning %d\n", ret);
+ return ret;
+}
+
+static int mtp_open(struct inode *ip, struct file *fp)
+{
+ printk(KERN_INFO "mtp_open\n");
+ if (mtp_lock(&_mtp_dev->open_excl))
+ return -EBUSY;
+
+ /* clear any error condition */
+ if (_mtp_dev->state != STATE_OFFLINE)
+ _mtp_dev->state = STATE_READY;
+
+ fp->private_data = _mtp_dev;
+ return 0;
+}
+
+static int mtp_release(struct inode *ip, struct file *fp)
+{
+ printk(KERN_INFO "mtp_release\n");
+
+ mtp_unlock(&_mtp_dev->open_excl);
+ return 0;
+}
+
+/* file operations for /dev/mtp_usb */
+static const struct file_operations mtp_fops = {
+ .owner = THIS_MODULE,
+ .read = mtp_read,
+ .write = mtp_write,
+ .unlocked_ioctl = mtp_ioctl,
+ .open = mtp_open,
+ .release = mtp_release,
+};
+
+static struct miscdevice mtp_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = mtp_shortname,
+ .fops = &mtp_fops,
+};
+
+static int mtp_ctrlrequest(struct usb_composite_dev *cdev,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct mtp_dev *dev = _mtp_dev;
+ int value = -EOPNOTSUPP;
+ u16 w_index = le16_to_cpu(ctrl->wIndex);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+ unsigned long flags;
+
+ VDBG(cdev, "mtp_ctrlrequest "
+ "%02x.%02x v%04x i%04x l%u\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+
+ /* Handle MTP OS string */
+ if (ctrl->bRequestType ==
+ (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE)
+ && ctrl->bRequest == USB_REQ_GET_DESCRIPTOR
+ && (w_value >> 8) == USB_DT_STRING
+ && (w_value & 0xFF) == MTP_OS_STRING_ID) {
+ value = (w_length < sizeof(mtp_os_string)
+ ? w_length : sizeof(mtp_os_string));
+ memcpy(cdev->req->buf, mtp_os_string, value);
+ } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
+ /* Handle MTP OS descriptor */
+ DBG(cdev, "vendor request: %d index: %d value: %d length: %d\n",
+ ctrl->bRequest, w_index, w_value, w_length);
+
+ if (ctrl->bRequest == 1
+ && (ctrl->bRequestType & USB_DIR_IN)
+ && (w_index == 4 || w_index == 5)) {
+ value = (w_length < sizeof(mtp_ext_config_desc) ?
+ w_length : sizeof(mtp_ext_config_desc));
+ memcpy(cdev->req->buf, &mtp_ext_config_desc, value);
+ }
+ } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
+ DBG(cdev, "class request: %d index: %d value: %d length: %d\n",
+ ctrl->bRequest, w_index, w_value, w_length);
+
+ if (ctrl->bRequest == MTP_REQ_CANCEL && w_index == 0
+ && w_value == 0) {
+ DBG(cdev, "MTP_REQ_CANCEL\n");
+
+ spin_lock_irqsave(&dev->lock, flags);
+ if (dev->state == STATE_BUSY) {
+ dev->state = STATE_CANCELED;
+ wake_up(&dev->read_wq);
+ wake_up(&dev->write_wq);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* We need to queue a request to read the remaining
+ * bytes, but we don't actually need to look at
+ * the contents.
+ */
+ value = w_length;
+ } else if (ctrl->bRequest == MTP_REQ_GET_DEVICE_STATUS
+ && w_index == 0 && w_value == 0) {
+ struct mtp_device_status *status = cdev->req->buf;
+ status->wLength =
+ __constant_cpu_to_le16(sizeof(*status));
+
+ DBG(cdev, "MTP_REQ_GET_DEVICE_STATUS\n");
+ spin_lock_irqsave(&dev->lock, flags);
+ /* device status is "busy" until we report
+ * the cancelation to userspace
+ */
+ if (dev->state == STATE_CANCELED)
+ status->wCode =
+ __cpu_to_le16(MTP_RESPONSE_DEVICE_BUSY);
+ else
+ status->wCode =
+ __cpu_to_le16(MTP_RESPONSE_OK);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ value = sizeof(*status);
+ }
+ }
+
+ /* respond with data transfer or status phase? */
+ if (value >= 0) {
+ int rc;
+ cdev->req->zero = value < w_length;
+ cdev->req->length = value;
+ rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
+ if (rc < 0)
+ ERROR(cdev, "%s: response queue error\n", __func__);
+ }
+ return value;
+}
+
+static int
+mtp_function_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct mtp_dev *dev = func_to_mtp(f);
+ int id;
+ int ret;
+
+ dev->cdev = cdev;
+ DBG(cdev, "mtp_function_bind dev: %p\n", dev);
+
+ /* allocate interface ID(s) */
+ id = usb_interface_id(c, f);
+ if (id < 0)
+ return id;
+ mtp_interface_desc.bInterfaceNumber = id;
+
+ if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) {
+ ret = usb_string_id(c->cdev);
+ if (ret < 0)
+ return ret;
+ mtp_string_defs[INTERFACE_STRING_INDEX].id = ret;
+ mtp_interface_desc.iInterface = ret;
+ }
+ /* allocate endpoints */
+ ret = mtp_create_bulk_endpoints(dev, &mtp_fullspeed_in_desc,
+ &mtp_fullspeed_out_desc, &mtp_intr_desc);
+ if (ret)
+ return ret;
+
+ /* support high speed hardware */
+ if (gadget_is_dualspeed(c->cdev->gadget)) {
+ mtp_highspeed_in_desc.bEndpointAddress =
+ mtp_fullspeed_in_desc.bEndpointAddress;
+ mtp_highspeed_out_desc.bEndpointAddress =
+ mtp_fullspeed_out_desc.bEndpointAddress;
+ }
+
+ DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
+ gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
+ f->name, dev->ep_in->name, dev->ep_out->name);
+ return 0;
+}
+
+static void
+mtp_function_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct mtp_dev *dev = func_to_mtp(f);
+ struct usb_request *req;
+ int i;
+
+ mtp_string_defs[INTERFACE_STRING_INDEX].id = 0;
+ while ((req = mtp_req_get(dev, &dev->tx_idle)))
+ mtp_request_free(req, dev->ep_in);
+ for (i = 0; i < RX_REQ_MAX; i++)
+ mtp_request_free(dev->rx_req[i], dev->ep_out);
+ while ((req = mtp_req_get(dev, &dev->intr_idle)))
+ mtp_request_free(req, dev->ep_intr);
+ dev->state = STATE_OFFLINE;
+}
+
+static int mtp_function_set_alt(struct usb_function *f,
+ unsigned intf, unsigned alt)
+{
+ struct mtp_dev *dev = func_to_mtp(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int ret;
+
+ DBG(cdev, "mtp_function_set_alt intf: %d alt: %d\n", intf, alt);
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_in);
+ if (ret)
+ return ret;
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_out);
+ if (ret) {
+ usb_ep_disable(dev->ep_in);
+ return ret;
+ }
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_intr);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_intr);
+ if (ret) {
+ usb_ep_disable(dev->ep_out);
+ usb_ep_disable(dev->ep_in);
+ return ret;
+ }
+ dev->state = STATE_READY;
+
+ /* readers may be blocked waiting for us to go online */
+ wake_up(&dev->read_wq);
+ return 0;
+}
+
+static void mtp_function_disable(struct usb_function *f)
+{
+ struct mtp_dev *dev = func_to_mtp(f);
+ struct usb_composite_dev *cdev = dev->cdev;
+
+ DBG(cdev, "mtp_function_disable\n");
+ dev->state = STATE_OFFLINE;
+ usb_ep_disable(dev->ep_in);
+ usb_ep_disable(dev->ep_out);
+ usb_ep_disable(dev->ep_intr);
+
+ /* readers may be blocked waiting for us to go online */
+ wake_up(&dev->read_wq);
+
+ VDBG(cdev, "%s disabled\n", dev->function.name);
+}
+
+static int mtp_bind_config(struct usb_configuration *c, bool ptp_config)
+{
+ struct mtp_dev *dev = _mtp_dev;
+ int ret = 0;
+
+ printk(KERN_INFO "mtp_bind_config\n");
+
+ /* allocate a string ID for our interface */
+ if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) {
+ ret = usb_string_id(c->cdev);
+ if (ret < 0)
+ return ret;
+ mtp_string_defs[INTERFACE_STRING_INDEX].id = ret;
+ mtp_interface_desc.iInterface = ret;
+ }
+
+ dev->cdev = c->cdev;
+ dev->function.name = DRIVER_NAME;
+ dev->function.strings = mtp_strings;
+ if (ptp_config) {
+ dev->function.fs_descriptors = fs_ptp_descs;
+ dev->function.hs_descriptors = hs_ptp_descs;
+ } else {
+ dev->function.fs_descriptors = fs_mtp_descs;
+ dev->function.hs_descriptors = hs_mtp_descs;
+ }
+ dev->function.bind = mtp_function_bind;
+ dev->function.unbind = mtp_function_unbind;
+ dev->function.set_alt = mtp_function_set_alt;
+ dev->function.disable = mtp_function_disable;
+
+ return usb_add_function(c, &dev->function);
+}
+
+static int __mtp_setup(struct mtp_instance *fi_mtp)
+{
+ struct mtp_dev *dev;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+
+ if (fi_mtp != NULL)
+ fi_mtp->dev = dev;
+
+ if (!dev)
+ return -ENOMEM;
+
+ spin_lock_init(&dev->lock);
+ init_waitqueue_head(&dev->read_wq);
+ init_waitqueue_head(&dev->write_wq);
+ init_waitqueue_head(&dev->intr_wq);
+ atomic_set(&dev->open_excl, 0);
+ atomic_set(&dev->ioctl_excl, 0);
+ INIT_LIST_HEAD(&dev->tx_idle);
+ INIT_LIST_HEAD(&dev->intr_idle);
+
+ dev->wq = create_singlethread_workqueue("f_mtp");
+ if (!dev->wq) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+ INIT_WORK(&dev->send_file_work, send_file_work);
+ INIT_WORK(&dev->receive_file_work, receive_file_work);
+
+ _mtp_dev = dev;
+
+ ret = misc_register(&mtp_device);
+ if (ret)
+ goto err2;
+
+ return 0;
+
+err2:
+ destroy_workqueue(dev->wq);
+err1:
+ _mtp_dev = NULL;
+ kfree(dev);
+ printk(KERN_ERR "mtp gadget driver failed to initialize\n");
+ return ret;
+}
+
+static int mtp_setup(void)
+{
+ return __mtp_setup(NULL);
+}
+
+static int mtp_setup_configfs(struct mtp_instance *fi_mtp)
+{
+ return __mtp_setup(fi_mtp);
+}
+
+
+static void mtp_cleanup(void)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ if (!dev)
+ return;
+
+ misc_deregister(&mtp_device);
+ destroy_workqueue(dev->wq);
+ _mtp_dev = NULL;
+ kfree(dev);
+}
+
+static struct mtp_instance *to_mtp_instance(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct mtp_instance,
+ func_inst.group);
+}
+
+static void mtp_attr_release(struct config_item *item)
+{
+ struct mtp_instance *fi_mtp = to_mtp_instance(item);
+ usb_put_function_instance(&fi_mtp->func_inst);
+}
+
+static struct configfs_item_operations mtp_item_ops = {
+ .release = mtp_attr_release,
+};
+
+static struct config_item_type mtp_func_type = {
+ .ct_item_ops = &mtp_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+
+static struct mtp_instance *to_fi_mtp(struct usb_function_instance *fi)
+{
+ return container_of(fi, struct mtp_instance, func_inst);
+}
+
+static int mtp_set_inst_name(struct usb_function_instance *fi, const char *name)
+{
+ struct mtp_instance *fi_mtp;
+ char *ptr;
+ int name_len;
+
+ name_len = strlen(name) + 1;
+ if (name_len > MAX_INST_NAME_LEN)
+ return -ENAMETOOLONG;
+
+ ptr = kstrndup(name, name_len, GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ fi_mtp = to_fi_mtp(fi);
+ fi_mtp->name = ptr;
+
+ return 0;
+}
+
+static void mtp_free_inst(struct usb_function_instance *fi)
+{
+ struct mtp_instance *fi_mtp;
+
+ fi_mtp = to_fi_mtp(fi);
+ kfree(fi_mtp->name);
+ mtp_cleanup();
+ kfree(fi_mtp);
+}
+
+struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config)
+{
+ struct mtp_instance *fi_mtp;
+ int ret = 0;
+
+ fi_mtp = kzalloc(sizeof(*fi_mtp), GFP_KERNEL);
+ if (!fi_mtp)
+ return ERR_PTR(-ENOMEM);
+ fi_mtp->func_inst.set_inst_name = mtp_set_inst_name;
+ fi_mtp->func_inst.free_func_inst = mtp_free_inst;
+
+ if (mtp_config) {
+ ret = mtp_setup_configfs(fi_mtp);
+ if (ret) {
+ kfree(fi_mtp);
+ pr_err("Error setting MTP\n");
+ return ERR_PTR(ret);
+ }
+ } else
+ fi_mtp->dev = _mtp_dev;
+
+ config_group_init_type_name(&fi_mtp->func_inst.group,
+ "", &mtp_func_type);
+
+ return &fi_mtp->func_inst;
+}
+EXPORT_SYMBOL_GPL(alloc_inst_mtp_ptp);
+
+static struct usb_function_instance *mtp_alloc_inst(void)
+{
+ return alloc_inst_mtp_ptp(true);
+}
+
+static int mtp_ctrlreq_configfs(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ return mtp_ctrlrequest(f->config->cdev, ctrl);
+}
+
+static void mtp_free(struct usb_function *f)
+{
+ /*NO-OP: no function specific resource allocation in mtp_alloc*/
+}
+
+struct usb_function *function_alloc_mtp_ptp(struct usb_function_instance *fi,
+ bool mtp_config)
+{
+ struct mtp_instance *fi_mtp = to_fi_mtp(fi);
+ struct mtp_dev *dev = fi_mtp->dev;
+
+ dev->function.name = DRIVER_NAME;
+ dev->function.strings = mtp_strings;
+ if (mtp_config) {
+ dev->function.fs_descriptors = fs_mtp_descs;
+ dev->function.hs_descriptors = hs_mtp_descs;
+ } else {
+ dev->function.fs_descriptors = fs_ptp_descs;
+ dev->function.hs_descriptors = hs_ptp_descs;
+ }
+ dev->function.bind = mtp_function_bind;
+ dev->function.unbind = mtp_function_unbind;
+ dev->function.set_alt = mtp_function_set_alt;
+ dev->function.disable = mtp_function_disable;
+ dev->function.setup = mtp_ctrlreq_configfs;
+ dev->function.free_func = mtp_free;
+
+ return &dev->function;
+}
+EXPORT_SYMBOL_GPL(function_alloc_mtp_ptp);
+
+static struct usb_function *mtp_alloc(struct usb_function_instance *fi)
+{
+ return function_alloc_mtp_ptp(fi, true);
+}
+
+DECLARE_USB_FUNCTION_INIT(mtp, mtp_alloc_inst, mtp_alloc);
+MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * Copyright (C) 2014 Google, Inc.
+ * Author: Badhri Jagan Sridharan <badhri@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+extern struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config);
+extern struct usb_function *function_alloc_mtp_ptp(
+ struct usb_function_instance *fi, bool mtp_config);
--- /dev/null
+/*
+ * Gadget Function Driver for PTP
+ *
+ * Copyright (C) 2014 Google, Inc.
+ * Author: Badhri Jagan Sridharan <badhri@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+
+#include "f_mtp.h"
+
+static struct usb_function_instance *ptp_alloc_inst(void)
+{
+ return alloc_inst_mtp_ptp(false);
+}
+
+static struct usb_function *ptp_alloc(struct usb_function_instance *fi)
+{
+ return function_alloc_mtp_ptp(fi, false);
+}
+
+DECLARE_USB_FUNCTION_INIT(ptp, ptp_alloc_inst, ptp_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Badhri Jagan Sridharan");
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff