The extant USB-Audio function driver complies to UAC_1 spec.
So name the files accordingly, paving way for inclusion of
a new UAC_2 specified driver.
Signed-off-by: Yadi Brar <yadi.brar01@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
#include <linux/kernel.h>
#include <linux/utsname.h>
-#include "u_audio.h"
+#include "u_uac1.h"
#define DRIVER_DESC "Linux USB Audio Gadget"
#define DRIVER_VERSION "Dec 18, 2008"
#include "config.c"
#include "epautoconf.c"
-#include "u_audio.c"
-#include "f_audio.c"
+#include "u_uac1.c"
+#include "f_uac1.c"
/*-------------------------------------------------------------------------*/
+++ /dev/null
-/*
- * f_audio.c -- USB Audio class function driver
- *
- * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
- * Copyright (C) 2008 Analog Devices, Inc
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/atomic.h>
-
-#include "u_audio.h"
-
-#define OUT_EP_MAX_PACKET_SIZE 200
-static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
-module_param(req_buf_size, int, S_IRUGO);
-MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
-
-static int req_count = 256;
-module_param(req_count, int, S_IRUGO);
-MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
-
-static int audio_buf_size = 48000;
-module_param(audio_buf_size, int, S_IRUGO);
-MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
-
-static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
-static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
-
-/*
- * DESCRIPTORS ... most are static, but strings and full
- * configuration descriptors are built on demand.
- */
-
-/*
- * We have two interfaces- AudioControl and AudioStreaming
- * TODO: only supcard playback currently
- */
-#define F_AUDIO_AC_INTERFACE 0
-#define F_AUDIO_AS_INTERFACE 1
-#define F_AUDIO_NUM_INTERFACES 2
-
-/* B.3.1 Standard AC Interface Descriptor */
-static struct usb_interface_descriptor ac_interface_desc __initdata = {
- .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(F_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 = F_AUDIO_NUM_INTERFACES,
- .baInterfaceNr = {
- [0] = F_AUDIO_AC_INTERFACE,
- [1] = F_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_TERMINAL_STREAMING,
- .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,
- .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
-};
-
-static struct usb_audio_control mute_control = {
- .list = LIST_HEAD_INIT(mute_control.list),
- .name = "Mute Control",
- .type = UAC_FU_MUTE,
- /* Todo: add real Mute control code */
- .set = generic_set_cmd,
- .get = generic_get_cmd,
-};
-
-static struct usb_audio_control volume_control = {
- .list = LIST_HEAD_INIT(volume_control.list),
- .name = "Volume Control",
- .type = UAC_FU_VOLUME,
- /* Todo: add real Volume control code */
- .set = generic_set_cmd,
- .get = generic_get_cmd,
-};
-
-static struct usb_audio_control_selector feature_unit = {
- .list = LIST_HEAD_INIT(feature_unit.list),
- .id = FEATURE_UNIT_ID,
- .name = "Mute & Volume Control",
- .type = UAC_FEATURE_UNIT,
- .desc = (struct usb_descriptor_header *)&feature_unit_desc,
-};
-
-#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_OUTPUT_TERMINAL_SPEAKER,
- .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 OUT Endpoint Descriptor */
-static struct usb_endpoint_descriptor as_out_ep_desc = {
- .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
- | USB_ENDPOINT_XFER_ISOC,
- .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
- .bInterval = 4,
-};
-
-/* Class-specific AS ISO OUT Endpoint Descriptor */
-static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
- .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 *f_audio_desc[] __initdata = {
- (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 *)&as_out_ep_desc,
- (struct usb_descriptor_header *)&as_iso_out_desc,
- NULL,
-};
-
-/* string IDs are assigned dynamically */
-
-#define STRING_MANUFACTURER_IDX 0
-#define STRING_PRODUCT_IDX 1
-
-static char manufacturer[50];
-
-static struct usb_string strings_dev[] = {
- [STRING_MANUFACTURER_IDX].s = manufacturer,
- [STRING_PRODUCT_IDX].s = DRIVER_DESC,
- { } /* end of list */
-};
-
-static struct usb_gadget_strings stringtab_dev = {
- .language = 0x0409, /* en-us */
- .strings = strings_dev,
-};
-
-static struct usb_gadget_strings *audio_strings[] = {
- &stringtab_dev,
- NULL,
-};
-
-/*
- * This function is an ALSA sound card following USB Audio Class Spec 1.0.
- */
-
-/*-------------------------------------------------------------------------*/
-struct f_audio_buf {
- u8 *buf;
- int actual;
- struct list_head list;
-};
-
-static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
-{
- struct f_audio_buf *copy_buf;
-
- copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
- if (!copy_buf)
- return ERR_PTR(-ENOMEM);
-
- copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
- if (!copy_buf->buf) {
- kfree(copy_buf);
- return ERR_PTR(-ENOMEM);
- }
-
- return copy_buf;
-}
-
-static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
-{
- kfree(audio_buf->buf);
- kfree(audio_buf);
-}
-/*-------------------------------------------------------------------------*/
-
-struct f_audio {
- struct gaudio card;
-
- /* endpoints handle full and/or high speeds */
- struct usb_ep *out_ep;
-
- spinlock_t lock;
- struct f_audio_buf *copy_buf;
- struct work_struct playback_work;
- struct list_head play_queue;
-
- /* Control Set command */
- struct list_head cs;
- u8 set_cmd;
- struct usb_audio_control *set_con;
-};
-
-static inline struct f_audio *func_to_audio(struct usb_function *f)
-{
- return container_of(f, struct f_audio, card.func);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void f_audio_playback_work(struct work_struct *data)
-{
- struct f_audio *audio = container_of(data, struct f_audio,
- playback_work);
- struct f_audio_buf *play_buf;
-
- spin_lock_irq(&audio->lock);
- if (list_empty(&audio->play_queue)) {
- spin_unlock_irq(&audio->lock);
- return;
- }
- play_buf = list_first_entry(&audio->play_queue,
- struct f_audio_buf, list);
- list_del(&play_buf->list);
- spin_unlock_irq(&audio->lock);
-
- u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
- f_audio_buffer_free(play_buf);
-}
-
-static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct f_audio *audio = req->context;
- struct usb_composite_dev *cdev = audio->card.func.config->cdev;
- struct f_audio_buf *copy_buf = audio->copy_buf;
- int err;
-
- if (!copy_buf)
- return -EINVAL;
-
- /* Copy buffer is full, add it to the play_queue */
- if (audio_buf_size - copy_buf->actual < req->actual) {
- list_add_tail(©_buf->list, &audio->play_queue);
- schedule_work(&audio->playback_work);
- copy_buf = f_audio_buffer_alloc(audio_buf_size);
- if (IS_ERR(copy_buf))
- return -ENOMEM;
- }
-
- memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
- copy_buf->actual += req->actual;
- audio->copy_buf = copy_buf;
-
- err = usb_ep_queue(ep, req, GFP_ATOMIC);
- if (err)
- ERROR(cdev, "%s queue req: %d\n", ep->name, err);
-
- return 0;
-
-}
-
-static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct f_audio *audio = req->context;
- int status = req->status;
- u32 data = 0;
- struct usb_ep *out_ep = audio->out_ep;
-
- switch (status) {
-
- case 0: /* normal completion? */
- if (ep == out_ep)
- f_audio_out_ep_complete(ep, req);
- else if (audio->set_con) {
- memcpy(&data, req->buf, req->length);
- audio->set_con->set(audio->set_con, audio->set_cmd,
- le16_to_cpu(data));
- audio->set_con = NULL;
- }
- break;
- default:
- break;
- }
-}
-
-static int audio_set_intf_req(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- struct f_audio *audio = func_to_audio(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- struct usb_request *req = cdev->req;
- u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
- u16 len = le16_to_cpu(ctrl->wLength);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u8 con_sel = (w_value >> 8) & 0xFF;
- u8 cmd = (ctrl->bRequest & 0x0F);
- struct usb_audio_control_selector *cs;
- struct usb_audio_control *con;
-
- DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
- ctrl->bRequest, w_value, len, id);
-
- list_for_each_entry(cs, &audio->cs, list) {
- if (cs->id == id) {
- list_for_each_entry(con, &cs->control, list) {
- if (con->type == con_sel) {
- audio->set_con = con;
- break;
- }
- }
- break;
- }
- }
-
- audio->set_cmd = cmd;
- req->context = audio;
- req->complete = f_audio_complete;
-
- return len;
-}
-
-static int audio_get_intf_req(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- struct f_audio *audio = func_to_audio(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- struct usb_request *req = cdev->req;
- int value = -EOPNOTSUPP;
- u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
- u16 len = le16_to_cpu(ctrl->wLength);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u8 con_sel = (w_value >> 8) & 0xFF;
- u8 cmd = (ctrl->bRequest & 0x0F);
- struct usb_audio_control_selector *cs;
- struct usb_audio_control *con;
-
- DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
- ctrl->bRequest, w_value, len, id);
-
- list_for_each_entry(cs, &audio->cs, list) {
- if (cs->id == id) {
- list_for_each_entry(con, &cs->control, list) {
- if (con->type == con_sel && con->get) {
- value = con->get(con, cmd);
- break;
- }
- }
- break;
- }
- }
-
- req->context = audio;
- req->complete = f_audio_complete;
- memcpy(req->buf, &value, len);
-
- return len;
-}
-
-static int audio_set_endpoint_req(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- struct usb_composite_dev *cdev = f->config->cdev;
- 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);
-
- DBG(cdev, "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:
- value = len;
- break;
-
- case UAC_SET_MIN:
- break;
-
- case UAC_SET_MAX:
- break;
-
- case UAC_SET_RES:
- break;
-
- case UAC_SET_MEM:
- 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);
-
- DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
- ctrl->bRequest, w_value, len, ep);
-
- switch (ctrl->bRequest) {
- case UAC_GET_CUR:
- case UAC_GET_MIN:
- case UAC_GET_MAX:
- case UAC_GET_RES:
- value = len;
- break;
- case UAC_GET_MEM:
- break;
- default:
- break;
- }
-
- return value;
-}
-
-static int
-f_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_INTERFACE:
- value = audio_set_intf_req(f, ctrl);
- break;
-
- case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
- value = audio_get_intf_req(f, ctrl);
- break;
-
- 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;
-
- default:
- ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- w_value, w_index, w_length);
- }
-
- /* respond with data transfer or status phase? */
- if (value >= 0) {
- DBG(cdev, "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;
- value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
- if (value < 0)
- ERROR(cdev, "audio response on err %d\n", value);
- }
-
- /* device either stalls (value < 0) or reports success */
- return value;
-}
-
-static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
-{
- struct f_audio *audio = func_to_audio(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- struct usb_ep *out_ep = audio->out_ep;
- struct usb_request *req;
- int i = 0, err = 0;
-
- DBG(cdev, "intf %d, alt %d\n", intf, alt);
-
- if (intf == 1) {
- if (alt == 1) {
- usb_ep_enable(out_ep);
- out_ep->driver_data = audio;
- audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
- if (IS_ERR(audio->copy_buf))
- return -ENOMEM;
-
- /*
- * allocate a bunch of read buffers
- * and queue them all at once.
- */
- for (i = 0; i < req_count && err == 0; i++) {
- req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
- if (req) {
- req->buf = kzalloc(req_buf_size,
- GFP_ATOMIC);
- if (req->buf) {
- req->length = req_buf_size;
- req->context = audio;
- req->complete =
- f_audio_complete;
- err = usb_ep_queue(out_ep,
- req, GFP_ATOMIC);
- if (err)
- ERROR(cdev,
- "%s queue req: %d\n",
- out_ep->name, err);
- } else
- err = -ENOMEM;
- } else
- err = -ENOMEM;
- }
-
- } else {
- struct f_audio_buf *copy_buf = audio->copy_buf;
- if (copy_buf) {
- list_add_tail(©_buf->list,
- &audio->play_queue);
- schedule_work(&audio->playback_work);
- }
- }
- }
-
- return err;
-}
-
-static void f_audio_disable(struct usb_function *f)
-{
- return;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void f_audio_build_desc(struct f_audio *audio)
-{
- struct gaudio *card = &audio->card;
- u8 *sam_freq;
- int rate;
-
- /* Set channel numbers */
- input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
- as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
-
- /* Set sample rates */
- rate = u_audio_get_playback_rate(card);
- sam_freq = as_type_i_desc.tSamFreq[0];
- memcpy(sam_freq, &rate, 3);
-
- /* Todo: Set Sample bits and other parameters */
-
- return;
-}
-
-/* audio function driver setup/binding */
-static int __init
-f_audio_bind(struct usb_configuration *c, struct usb_function *f)
-{
- struct usb_composite_dev *cdev = c->cdev;
- struct f_audio *audio = func_to_audio(f);
- int status;
- struct usb_ep *ep;
-
- f_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;
-
- 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;
-
- status = -ENODEV;
-
- /* allocate instance-specific endpoints */
- ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
- if (!ep)
- goto fail;
- audio->out_ep = ep;
- audio->out_ep->desc = &as_out_ep_desc;
- ep->driver_data = cdev; /* claim */
-
- status = -ENOMEM;
-
- /* copy descriptors, and track endpoint copies */
- f->descriptors = usb_copy_descriptors(f_audio_desc);
-
- /*
- * support all relevant hardware speeds... we expect that when
- * hardware is dual speed, all bulk-capable endpoints work at
- * both speeds
- */
- if (gadget_is_dualspeed(c->cdev->gadget)) {
- c->highspeed = true;
- f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
- }
-
- return 0;
-
-fail:
-
- return status;
-}
-
-static void
-f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
-{
- struct f_audio *audio = func_to_audio(f);
-
- usb_free_descriptors(f->descriptors);
- usb_free_descriptors(f->hs_descriptors);
- kfree(audio);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
-{
- con->data[cmd] = value;
-
- return 0;
-}
-
-static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
-{
- return con->data[cmd];
-}
-
-/* Todo: add more control selecotor dynamically */
-int __init control_selector_init(struct f_audio *audio)
-{
- INIT_LIST_HEAD(&audio->cs);
- list_add(&feature_unit.list, &audio->cs);
-
- INIT_LIST_HEAD(&feature_unit.control);
- list_add(&mute_control.list, &feature_unit.control);
- list_add(&volume_control.list, &feature_unit.control);
-
- volume_control.data[UAC__CUR] = 0xffc0;
- volume_control.data[UAC__MIN] = 0xe3a0;
- volume_control.data[UAC__MAX] = 0xfff0;
- volume_control.data[UAC__RES] = 0x0030;
-
- return 0;
-}
-
-/**
- * audio_bind_config - add USB audio function to a configuration
- * @c: the configuration to supcard the USB audio function
- * Context: single threaded during gadget setup
- *
- * Returns zero on success, else negative errno.
- */
-int __init audio_bind_config(struct usb_configuration *c)
-{
- struct f_audio *audio;
- int status;
-
- /* allocate and initialize one new instance */
- audio = kzalloc(sizeof *audio, GFP_KERNEL);
- if (!audio)
- return -ENOMEM;
-
- audio->card.func.name = "g_audio";
- audio->card.gadget = c->cdev->gadget;
-
- INIT_LIST_HEAD(&audio->play_queue);
- spin_lock_init(&audio->lock);
-
- /* set up ASLA audio devices */
- status = gaudio_setup(&audio->card);
- if (status < 0)
- goto setup_fail;
-
- audio->card.func.strings = audio_strings;
- audio->card.func.bind = f_audio_bind;
- audio->card.func.unbind = f_audio_unbind;
- audio->card.func.set_alt = f_audio_set_alt;
- audio->card.func.setup = f_audio_setup;
- audio->card.func.disable = f_audio_disable;
-
- control_selector_init(audio);
-
- INIT_WORK(&audio->playback_work, f_audio_playback_work);
-
- status = usb_add_function(c, &audio->card.func);
- if (status)
- goto add_fail;
-
- INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
- audio_buf_size, req_buf_size, req_count);
-
- return status;
-
-add_fail:
- gaudio_cleanup();
-setup_fail:
- kfree(audio);
- return status;
-}
--- /dev/null
+/*
+ * f_audio.c -- USB Audio class function driver
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/atomic.h>
+
+#include "u_uac1.h"
+
+#define OUT_EP_MAX_PACKET_SIZE 200
+static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
+module_param(req_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
+
+static int req_count = 256;
+module_param(req_count, int, S_IRUGO);
+MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
+
+static int audio_buf_size = 48000;
+module_param(audio_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
+
+static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
+static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
+
+/*
+ * DESCRIPTORS ... most are static, but strings and full
+ * configuration descriptors are built on demand.
+ */
+
+/*
+ * We have two interfaces- AudioControl and AudioStreaming
+ * TODO: only supcard playback currently
+ */
+#define F_AUDIO_AC_INTERFACE 0
+#define F_AUDIO_AS_INTERFACE 1
+#define F_AUDIO_NUM_INTERFACES 2
+
+/* B.3.1 Standard AC Interface Descriptor */
+static struct usb_interface_descriptor ac_interface_desc __initdata = {
+ .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(F_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 = F_AUDIO_NUM_INTERFACES,
+ .baInterfaceNr = {
+ [0] = F_AUDIO_AC_INTERFACE,
+ [1] = F_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_TERMINAL_STREAMING,
+ .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,
+ .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
+};
+
+static struct usb_audio_control mute_control = {
+ .list = LIST_HEAD_INIT(mute_control.list),
+ .name = "Mute Control",
+ .type = UAC_FU_MUTE,
+ /* Todo: add real Mute control code */
+ .set = generic_set_cmd,
+ .get = generic_get_cmd,
+};
+
+static struct usb_audio_control volume_control = {
+ .list = LIST_HEAD_INIT(volume_control.list),
+ .name = "Volume Control",
+ .type = UAC_FU_VOLUME,
+ /* Todo: add real Volume control code */
+ .set = generic_set_cmd,
+ .get = generic_get_cmd,
+};
+
+static struct usb_audio_control_selector feature_unit = {
+ .list = LIST_HEAD_INIT(feature_unit.list),
+ .id = FEATURE_UNIT_ID,
+ .name = "Mute & Volume Control",
+ .type = UAC_FEATURE_UNIT,
+ .desc = (struct usb_descriptor_header *)&feature_unit_desc,
+};
+
+#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_OUTPUT_TERMINAL_SPEAKER,
+ .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 OUT Endpoint Descriptor */
+static struct usb_endpoint_descriptor as_out_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
+ .bInterval = 4,
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
+ .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 *f_audio_desc[] __initdata = {
+ (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 *)&as_out_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_out_desc,
+ NULL,
+};
+
+/* string IDs are assigned dynamically */
+
+#define STRING_MANUFACTURER_IDX 0
+#define STRING_PRODUCT_IDX 1
+
+static char manufacturer[50];
+
+static struct usb_string strings_dev[] = {
+ [STRING_MANUFACTURER_IDX].s = manufacturer,
+ [STRING_PRODUCT_IDX].s = DRIVER_DESC,
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_dev,
+};
+
+static struct usb_gadget_strings *audio_strings[] = {
+ &stringtab_dev,
+ NULL,
+};
+
+/*
+ * This function is an ALSA sound card following USB Audio Class Spec 1.0.
+ */
+
+/*-------------------------------------------------------------------------*/
+struct f_audio_buf {
+ u8 *buf;
+ int actual;
+ struct list_head list;
+};
+
+static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
+{
+ struct f_audio_buf *copy_buf;
+
+ copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
+ if (!copy_buf)
+ return ERR_PTR(-ENOMEM);
+
+ copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
+ if (!copy_buf->buf) {
+ kfree(copy_buf);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return copy_buf;
+}
+
+static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
+{
+ kfree(audio_buf->buf);
+ kfree(audio_buf);
+}
+/*-------------------------------------------------------------------------*/
+
+struct f_audio {
+ struct gaudio card;
+
+ /* endpoints handle full and/or high speeds */
+ struct usb_ep *out_ep;
+
+ spinlock_t lock;
+ struct f_audio_buf *copy_buf;
+ struct work_struct playback_work;
+ struct list_head play_queue;
+
+ /* Control Set command */
+ struct list_head cs;
+ u8 set_cmd;
+ struct usb_audio_control *set_con;
+};
+
+static inline struct f_audio *func_to_audio(struct usb_function *f)
+{
+ return container_of(f, struct f_audio, card.func);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void f_audio_playback_work(struct work_struct *data)
+{
+ struct f_audio *audio = container_of(data, struct f_audio,
+ playback_work);
+ struct f_audio_buf *play_buf;
+
+ spin_lock_irq(&audio->lock);
+ if (list_empty(&audio->play_queue)) {
+ spin_unlock_irq(&audio->lock);
+ return;
+ }
+ play_buf = list_first_entry(&audio->play_queue,
+ struct f_audio_buf, list);
+ list_del(&play_buf->list);
+ spin_unlock_irq(&audio->lock);
+
+ u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
+ f_audio_buffer_free(play_buf);
+}
+
+static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_audio *audio = req->context;
+ struct usb_composite_dev *cdev = audio->card.func.config->cdev;
+ struct f_audio_buf *copy_buf = audio->copy_buf;
+ int err;
+
+ if (!copy_buf)
+ return -EINVAL;
+
+ /* Copy buffer is full, add it to the play_queue */
+ if (audio_buf_size - copy_buf->actual < req->actual) {
+ list_add_tail(©_buf->list, &audio->play_queue);
+ schedule_work(&audio->playback_work);
+ copy_buf = f_audio_buffer_alloc(audio_buf_size);
+ if (IS_ERR(copy_buf))
+ return -ENOMEM;
+ }
+
+ memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
+ copy_buf->actual += req->actual;
+ audio->copy_buf = copy_buf;
+
+ err = usb_ep_queue(ep, req, GFP_ATOMIC);
+ if (err)
+ ERROR(cdev, "%s queue req: %d\n", ep->name, err);
+
+ return 0;
+
+}
+
+static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_audio *audio = req->context;
+ int status = req->status;
+ u32 data = 0;
+ struct usb_ep *out_ep = audio->out_ep;
+
+ switch (status) {
+
+ case 0: /* normal completion? */
+ if (ep == out_ep)
+ f_audio_out_ep_complete(ep, req);
+ else if (audio->set_con) {
+ memcpy(&data, req->buf, req->length);
+ audio->set_con->set(audio->set_con, audio->set_cmd,
+ le16_to_cpu(data));
+ audio->set_con = NULL;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static int audio_set_intf_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct f_audio *audio = func_to_audio(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_request *req = cdev->req;
+ u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u8 con_sel = (w_value >> 8) & 0xFF;
+ u8 cmd = (ctrl->bRequest & 0x0F);
+ struct usb_audio_control_selector *cs;
+ struct usb_audio_control *con;
+
+ DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
+ ctrl->bRequest, w_value, len, id);
+
+ list_for_each_entry(cs, &audio->cs, list) {
+ if (cs->id == id) {
+ list_for_each_entry(con, &cs->control, list) {
+ if (con->type == con_sel) {
+ audio->set_con = con;
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ audio->set_cmd = cmd;
+ req->context = audio;
+ req->complete = f_audio_complete;
+
+ return len;
+}
+
+static int audio_get_intf_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct f_audio *audio = func_to_audio(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_request *req = cdev->req;
+ int value = -EOPNOTSUPP;
+ u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u8 con_sel = (w_value >> 8) & 0xFF;
+ u8 cmd = (ctrl->bRequest & 0x0F);
+ struct usb_audio_control_selector *cs;
+ struct usb_audio_control *con;
+
+ DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
+ ctrl->bRequest, w_value, len, id);
+
+ list_for_each_entry(cs, &audio->cs, list) {
+ if (cs->id == id) {
+ list_for_each_entry(con, &cs->control, list) {
+ if (con->type == con_sel && con->get) {
+ value = con->get(con, cmd);
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ req->context = audio;
+ req->complete = f_audio_complete;
+ memcpy(req->buf, &value, len);
+
+ return len;
+}
+
+static int audio_set_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ 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);
+
+ DBG(cdev, "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:
+ value = len;
+ break;
+
+ case UAC_SET_MIN:
+ break;
+
+ case UAC_SET_MAX:
+ break;
+
+ case UAC_SET_RES:
+ break;
+
+ case UAC_SET_MEM:
+ 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);
+
+ DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ switch (ctrl->bRequest) {
+ case UAC_GET_CUR:
+ case UAC_GET_MIN:
+ case UAC_GET_MAX:
+ case UAC_GET_RES:
+ value = len;
+ break;
+ case UAC_GET_MEM:
+ break;
+ default:
+ break;
+ }
+
+ return value;
+}
+
+static int
+f_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_INTERFACE:
+ value = audio_set_intf_req(f, ctrl);
+ break;
+
+ case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
+ value = audio_get_intf_req(f, ctrl);
+ break;
+
+ 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;
+
+ default:
+ ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ }
+
+ /* respond with data transfer or status phase? */
+ if (value >= 0) {
+ DBG(cdev, "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;
+ value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+ if (value < 0)
+ ERROR(cdev, "audio response on err %d\n", value);
+ }
+
+ /* device either stalls (value < 0) or reports success */
+ return value;
+}
+
+static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct f_audio *audio = func_to_audio(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_ep *out_ep = audio->out_ep;
+ struct usb_request *req;
+ int i = 0, err = 0;
+
+ DBG(cdev, "intf %d, alt %d\n", intf, alt);
+
+ if (intf == 1) {
+ if (alt == 1) {
+ usb_ep_enable(out_ep);
+ out_ep->driver_data = audio;
+ audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
+ if (IS_ERR(audio->copy_buf))
+ return -ENOMEM;
+
+ /*
+ * allocate a bunch of read buffers
+ * and queue them all at once.
+ */
+ for (i = 0; i < req_count && err == 0; i++) {
+ req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
+ if (req) {
+ req->buf = kzalloc(req_buf_size,
+ GFP_ATOMIC);
+ if (req->buf) {
+ req->length = req_buf_size;
+ req->context = audio;
+ req->complete =
+ f_audio_complete;
+ err = usb_ep_queue(out_ep,
+ req, GFP_ATOMIC);
+ if (err)
+ ERROR(cdev,
+ "%s queue req: %d\n",
+ out_ep->name, err);
+ } else
+ err = -ENOMEM;
+ } else
+ err = -ENOMEM;
+ }
+
+ } else {
+ struct f_audio_buf *copy_buf = audio->copy_buf;
+ if (copy_buf) {
+ list_add_tail(©_buf->list,
+ &audio->play_queue);
+ schedule_work(&audio->playback_work);
+ }
+ }
+ }
+
+ return err;
+}
+
+static void f_audio_disable(struct usb_function *f)
+{
+ return;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void f_audio_build_desc(struct f_audio *audio)
+{
+ struct gaudio *card = &audio->card;
+ u8 *sam_freq;
+ int rate;
+
+ /* Set channel numbers */
+ input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
+ as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
+
+ /* Set sample rates */
+ rate = u_audio_get_playback_rate(card);
+ sam_freq = as_type_i_desc.tSamFreq[0];
+ memcpy(sam_freq, &rate, 3);
+
+ /* Todo: Set Sample bits and other parameters */
+
+ return;
+}
+
+/* audio function driver setup/binding */
+static int __init
+f_audio_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct f_audio *audio = func_to_audio(f);
+ int status;
+ struct usb_ep *ep;
+
+ f_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;
+
+ 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;
+
+ status = -ENODEV;
+
+ /* allocate instance-specific endpoints */
+ ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
+ if (!ep)
+ goto fail;
+ audio->out_ep = ep;
+ audio->out_ep->desc = &as_out_ep_desc;
+ ep->driver_data = cdev; /* claim */
+
+ status = -ENOMEM;
+
+ /* copy descriptors, and track endpoint copies */
+ f->descriptors = usb_copy_descriptors(f_audio_desc);
+
+ /*
+ * support all relevant hardware speeds... we expect that when
+ * hardware is dual speed, all bulk-capable endpoints work at
+ * both speeds
+ */
+ if (gadget_is_dualspeed(c->cdev->gadget)) {
+ c->highspeed = true;
+ f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
+ }
+
+ return 0;
+
+fail:
+
+ return status;
+}
+
+static void
+f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct f_audio *audio = func_to_audio(f);
+
+ usb_free_descriptors(f->descriptors);
+ usb_free_descriptors(f->hs_descriptors);
+ kfree(audio);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
+{
+ con->data[cmd] = value;
+
+ return 0;
+}
+
+static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
+{
+ return con->data[cmd];
+}
+
+/* Todo: add more control selecotor dynamically */
+int __init control_selector_init(struct f_audio *audio)
+{
+ INIT_LIST_HEAD(&audio->cs);
+ list_add(&feature_unit.list, &audio->cs);
+
+ INIT_LIST_HEAD(&feature_unit.control);
+ list_add(&mute_control.list, &feature_unit.control);
+ list_add(&volume_control.list, &feature_unit.control);
+
+ volume_control.data[UAC__CUR] = 0xffc0;
+ volume_control.data[UAC__MIN] = 0xe3a0;
+ volume_control.data[UAC__MAX] = 0xfff0;
+ volume_control.data[UAC__RES] = 0x0030;
+
+ return 0;
+}
+
+/**
+ * audio_bind_config - add USB audio function to a configuration
+ * @c: the configuration to supcard the USB audio function
+ * Context: single threaded during gadget setup
+ *
+ * Returns zero on success, else negative errno.
+ */
+int __init audio_bind_config(struct usb_configuration *c)
+{
+ struct f_audio *audio;
+ int status;
+
+ /* allocate and initialize one new instance */
+ audio = kzalloc(sizeof *audio, GFP_KERNEL);
+ if (!audio)
+ return -ENOMEM;
+
+ audio->card.func.name = "g_audio";
+ audio->card.gadget = c->cdev->gadget;
+
+ INIT_LIST_HEAD(&audio->play_queue);
+ spin_lock_init(&audio->lock);
+
+ /* set up ASLA audio devices */
+ status = gaudio_setup(&audio->card);
+ if (status < 0)
+ goto setup_fail;
+
+ audio->card.func.strings = audio_strings;
+ audio->card.func.bind = f_audio_bind;
+ audio->card.func.unbind = f_audio_unbind;
+ audio->card.func.set_alt = f_audio_set_alt;
+ audio->card.func.setup = f_audio_setup;
+ audio->card.func.disable = f_audio_disable;
+
+ control_selector_init(audio);
+
+ INIT_WORK(&audio->playback_work, f_audio_playback_work);
+
+ status = usb_add_function(c, &audio->card.func);
+ if (status)
+ goto add_fail;
+
+ INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
+ audio_buf_size, req_buf_size, req_count);
+
+ return status;
+
+add_fail:
+ gaudio_cleanup();
+setup_fail:
+ kfree(audio);
+ return status;
+}
+++ /dev/null
-/*
- * u_audio.c -- ALSA audio utilities for Gadget stack
- *
- * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
- * Copyright (C) 2008 Analog Devices, Inc
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-#include <linux/delay.h>
-#include <linux/ctype.h>
-#include <linux/random.h>
-#include <linux/syscalls.h>
-
-#include "u_audio.h"
-
-/*
- * This component encapsulates the ALSA devices for USB audio gadget
- */
-
-#define FILE_PCM_PLAYBACK "/dev/snd/pcmC0D0p"
-#define FILE_PCM_CAPTURE "/dev/snd/pcmC0D0c"
-#define FILE_CONTROL "/dev/snd/controlC0"
-
-static char *fn_play = FILE_PCM_PLAYBACK;
-module_param(fn_play, charp, S_IRUGO);
-MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
-
-static char *fn_cap = FILE_PCM_CAPTURE;
-module_param(fn_cap, charp, S_IRUGO);
-MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
-
-static char *fn_cntl = FILE_CONTROL;
-module_param(fn_cntl, charp, S_IRUGO);
-MODULE_PARM_DESC(fn_cntl, "Control device file name");
-
-/*-------------------------------------------------------------------------*/
-
-/**
- * Some ALSA internal helper functions
- */
-static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
-{
- struct snd_interval t;
- t.empty = 0;
- t.min = t.max = val;
- t.openmin = t.openmax = 0;
- t.integer = 1;
- return snd_interval_refine(i, &t);
-}
-
-static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var, unsigned int val,
- int dir)
-{
- int changed;
- if (hw_is_mask(var)) {
- struct snd_mask *m = hw_param_mask(params, var);
- if (val == 0 && dir < 0) {
- changed = -EINVAL;
- snd_mask_none(m);
- } else {
- if (dir > 0)
- val++;
- else if (dir < 0)
- val--;
- changed = snd_mask_refine_set(
- hw_param_mask(params, var), val);
- }
- } else if (hw_is_interval(var)) {
- struct snd_interval *i = hw_param_interval(params, var);
- if (val == 0 && dir < 0) {
- changed = -EINVAL;
- snd_interval_none(i);
- } else if (dir == 0)
- changed = snd_interval_refine_set(i, val);
- else {
- struct snd_interval t;
- t.openmin = 1;
- t.openmax = 1;
- t.empty = 0;
- t.integer = 0;
- if (dir < 0) {
- t.min = val - 1;
- t.max = val;
- } else {
- t.min = val;
- t.max = val+1;
- }
- changed = snd_interval_refine(i, &t);
- }
- } else
- return -EINVAL;
- if (changed) {
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- }
- return changed;
-}
-/*-------------------------------------------------------------------------*/
-
-/**
- * Set default hardware params
- */
-static int playback_default_hw_params(struct gaudio_snd_dev *snd)
-{
- struct snd_pcm_substream *substream = snd->substream;
- struct snd_pcm_hw_params *params;
- snd_pcm_sframes_t result;
-
- /*
- * SNDRV_PCM_ACCESS_RW_INTERLEAVED,
- * SNDRV_PCM_FORMAT_S16_LE
- * CHANNELS: 2
- * RATE: 48000
- */
- snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
- snd->format = SNDRV_PCM_FORMAT_S16_LE;
- snd->channels = 2;
- snd->rate = 48000;
-
- params = kzalloc(sizeof(*params), GFP_KERNEL);
- if (!params)
- return -ENOMEM;
-
- _snd_pcm_hw_params_any(params);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
- snd->access, 0);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
- snd->format, 0);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
- snd->channels, 0);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
- snd->rate, 0);
-
- snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
- snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
-
- result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
- if (result < 0) {
- ERROR(snd->card,
- "Preparing sound card failed: %d\n", (int)result);
- kfree(params);
- return result;
- }
-
- /* Store the hardware parameters */
- snd->access = params_access(params);
- snd->format = params_format(params);
- snd->channels = params_channels(params);
- snd->rate = params_rate(params);
-
- kfree(params);
-
- INFO(snd->card,
- "Hardware params: access %x, format %x, channels %d, rate %d\n",
- snd->access, snd->format, snd->channels, snd->rate);
-
- return 0;
-}
-
-/**
- * Playback audio buffer data by ALSA PCM device
- */
-static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
-{
- struct gaudio_snd_dev *snd = &card->playback;
- struct snd_pcm_substream *substream = snd->substream;
- struct snd_pcm_runtime *runtime = substream->runtime;
- mm_segment_t old_fs;
- ssize_t result;
- snd_pcm_sframes_t frames;
-
-try_again:
- if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
- runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
- result = snd_pcm_kernel_ioctl(substream,
- SNDRV_PCM_IOCTL_PREPARE, NULL);
- if (result < 0) {
- ERROR(card, "Preparing sound card failed: %d\n",
- (int)result);
- return result;
- }
- }
-
- frames = bytes_to_frames(runtime, count);
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- result = snd_pcm_lib_write(snd->substream, buf, frames);
- if (result != frames) {
- ERROR(card, "Playback error: %d\n", (int)result);
- set_fs(old_fs);
- goto try_again;
- }
- set_fs(old_fs);
-
- return 0;
-}
-
-static int u_audio_get_playback_channels(struct gaudio *card)
-{
- return card->playback.channels;
-}
-
-static int u_audio_get_playback_rate(struct gaudio *card)
-{
- return card->playback.rate;
-}
-
-/**
- * Open ALSA PCM and control device files
- * Initial the PCM or control device
- */
-static int gaudio_open_snd_dev(struct gaudio *card)
-{
- struct snd_pcm_file *pcm_file;
- struct gaudio_snd_dev *snd;
-
- if (!card)
- return -ENODEV;
-
- /* Open control device */
- snd = &card->control;
- snd->filp = filp_open(fn_cntl, O_RDWR, 0);
- if (IS_ERR(snd->filp)) {
- int ret = PTR_ERR(snd->filp);
- ERROR(card, "unable to open sound control device file: %s\n",
- fn_cntl);
- snd->filp = NULL;
- return ret;
- }
- snd->card = card;
-
- /* Open PCM playback device and setup substream */
- snd = &card->playback;
- snd->filp = filp_open(fn_play, O_WRONLY, 0);
- if (IS_ERR(snd->filp)) {
- ERROR(card, "No such PCM playback device: %s\n", fn_play);
- snd->filp = NULL;
- }
- pcm_file = snd->filp->private_data;
- snd->substream = pcm_file->substream;
- snd->card = card;
- playback_default_hw_params(snd);
-
- /* Open PCM capture device and setup substream */
- snd = &card->capture;
- snd->filp = filp_open(fn_cap, O_RDONLY, 0);
- if (IS_ERR(snd->filp)) {
- ERROR(card, "No such PCM capture device: %s\n", fn_cap);
- snd->substream = NULL;
- snd->card = NULL;
- snd->filp = NULL;
- } else {
- pcm_file = snd->filp->private_data;
- snd->substream = pcm_file->substream;
- snd->card = card;
- }
-
- return 0;
-}
-
-/**
- * Close ALSA PCM and control device files
- */
-static int gaudio_close_snd_dev(struct gaudio *gau)
-{
- struct gaudio_snd_dev *snd;
-
- /* Close control device */
- snd = &gau->control;
- if (snd->filp)
- filp_close(snd->filp, current->files);
-
- /* Close PCM playback device and setup substream */
- snd = &gau->playback;
- if (snd->filp)
- filp_close(snd->filp, current->files);
-
- /* Close PCM capture device and setup substream */
- snd = &gau->capture;
- if (snd->filp)
- filp_close(snd->filp, current->files);
-
- return 0;
-}
-
-static struct gaudio *the_card;
-/**
- * gaudio_setup - setup ALSA interface and preparing for USB transfer
- *
- * This sets up PCM, mixer or MIDI ALSA devices fore USB gadget using.
- *
- * Returns negative errno, or zero on success
- */
-int __init gaudio_setup(struct gaudio *card)
-{
- int ret;
-
- ret = gaudio_open_snd_dev(card);
- if (ret)
- ERROR(card, "we need at least one control device\n");
- else if (!the_card)
- the_card = card;
-
- return ret;
-
-}
-
-/**
- * gaudio_cleanup - remove ALSA device interface
- *
- * This is called to free all resources allocated by @gaudio_setup().
- */
-void gaudio_cleanup(void)
-{
- if (the_card) {
- gaudio_close_snd_dev(the_card);
- the_card = NULL;
- }
-}
-
+++ /dev/null
-/*
- * u_audio.h -- interface to USB gadget "ALSA AUDIO" utilities
- *
- * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
- * Copyright (C) 2008 Analog Devices, Inc
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#ifndef __U_AUDIO_H
-#define __U_AUDIO_H
-
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/usb/audio.h>
-#include <linux/usb/composite.h>
-
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-
-#include "gadget_chips.h"
-
-/*
- * This represents the USB side of an audio card device, managed by a USB
- * function which provides control and stream interfaces.
- */
-
-struct gaudio_snd_dev {
- struct gaudio *card;
- struct file *filp;
- struct snd_pcm_substream *substream;
- int access;
- int format;
- int channels;
- int rate;
-};
-
-struct gaudio {
- struct usb_function func;
- struct usb_gadget *gadget;
-
- /* ALSA sound device interfaces */
- struct gaudio_snd_dev control;
- struct gaudio_snd_dev playback;
- struct gaudio_snd_dev capture;
-
- /* TODO */
-};
-
-int gaudio_setup(struct gaudio *card);
-void gaudio_cleanup(void);
-
-#endif /* __U_AUDIO_H */
--- /dev/null
+/*
+ * u_uac1.c -- ALSA audio utilities for Gadget stack
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/ctype.h>
+#include <linux/random.h>
+#include <linux/syscalls.h>
+
+#include "u_uac1.h"
+
+/*
+ * This component encapsulates the ALSA devices for USB audio gadget
+ */
+
+#define FILE_PCM_PLAYBACK "/dev/snd/pcmC0D0p"
+#define FILE_PCM_CAPTURE "/dev/snd/pcmC0D0c"
+#define FILE_CONTROL "/dev/snd/controlC0"
+
+static char *fn_play = FILE_PCM_PLAYBACK;
+module_param(fn_play, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
+
+static char *fn_cap = FILE_PCM_CAPTURE;
+module_param(fn_cap, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
+
+static char *fn_cntl = FILE_CONTROL;
+module_param(fn_cntl, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cntl, "Control device file name");
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Some ALSA internal helper functions
+ */
+static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
+{
+ struct snd_interval t;
+ t.empty = 0;
+ t.min = t.max = val;
+ t.openmin = t.openmax = 0;
+ t.integer = 1;
+ return snd_interval_refine(i, &t);
+}
+
+static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
+ snd_pcm_hw_param_t var, unsigned int val,
+ int dir)
+{
+ int changed;
+ if (hw_is_mask(var)) {
+ struct snd_mask *m = hw_param_mask(params, var);
+ if (val == 0 && dir < 0) {
+ changed = -EINVAL;
+ snd_mask_none(m);
+ } else {
+ if (dir > 0)
+ val++;
+ else if (dir < 0)
+ val--;
+ changed = snd_mask_refine_set(
+ hw_param_mask(params, var), val);
+ }
+ } else if (hw_is_interval(var)) {
+ struct snd_interval *i = hw_param_interval(params, var);
+ if (val == 0 && dir < 0) {
+ changed = -EINVAL;
+ snd_interval_none(i);
+ } else if (dir == 0)
+ changed = snd_interval_refine_set(i, val);
+ else {
+ struct snd_interval t;
+ t.openmin = 1;
+ t.openmax = 1;
+ t.empty = 0;
+ t.integer = 0;
+ if (dir < 0) {
+ t.min = val - 1;
+ t.max = val;
+ } else {
+ t.min = val;
+ t.max = val+1;
+ }
+ changed = snd_interval_refine(i, &t);
+ }
+ } else
+ return -EINVAL;
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Set default hardware params
+ */
+static int playback_default_hw_params(struct gaudio_snd_dev *snd)
+{
+ struct snd_pcm_substream *substream = snd->substream;
+ struct snd_pcm_hw_params *params;
+ snd_pcm_sframes_t result;
+
+ /*
+ * SNDRV_PCM_ACCESS_RW_INTERLEAVED,
+ * SNDRV_PCM_FORMAT_S16_LE
+ * CHANNELS: 2
+ * RATE: 48000
+ */
+ snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+ snd->format = SNDRV_PCM_FORMAT_S16_LE;
+ snd->channels = 2;
+ snd->rate = 48000;
+
+ params = kzalloc(sizeof(*params), GFP_KERNEL);
+ if (!params)
+ return -ENOMEM;
+
+ _snd_pcm_hw_params_any(params);
+ _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
+ snd->access, 0);
+ _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
+ snd->format, 0);
+ _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
+ snd->channels, 0);
+ _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
+ snd->rate, 0);
+
+ snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
+ snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
+
+ result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
+ if (result < 0) {
+ ERROR(snd->card,
+ "Preparing sound card failed: %d\n", (int)result);
+ kfree(params);
+ return result;
+ }
+
+ /* Store the hardware parameters */
+ snd->access = params_access(params);
+ snd->format = params_format(params);
+ snd->channels = params_channels(params);
+ snd->rate = params_rate(params);
+
+ kfree(params);
+
+ INFO(snd->card,
+ "Hardware params: access %x, format %x, channels %d, rate %d\n",
+ snd->access, snd->format, snd->channels, snd->rate);
+
+ return 0;
+}
+
+/**
+ * Playback audio buffer data by ALSA PCM device
+ */
+static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
+{
+ struct gaudio_snd_dev *snd = &card->playback;
+ struct snd_pcm_substream *substream = snd->substream;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ mm_segment_t old_fs;
+ ssize_t result;
+ snd_pcm_sframes_t frames;
+
+try_again:
+ if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
+ runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
+ result = snd_pcm_kernel_ioctl(substream,
+ SNDRV_PCM_IOCTL_PREPARE, NULL);
+ if (result < 0) {
+ ERROR(card, "Preparing sound card failed: %d\n",
+ (int)result);
+ return result;
+ }
+ }
+
+ frames = bytes_to_frames(runtime, count);
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ result = snd_pcm_lib_write(snd->substream, buf, frames);
+ if (result != frames) {
+ ERROR(card, "Playback error: %d\n", (int)result);
+ set_fs(old_fs);
+ goto try_again;
+ }
+ set_fs(old_fs);
+
+ return 0;
+}
+
+static int u_audio_get_playback_channels(struct gaudio *card)
+{
+ return card->playback.channels;
+}
+
+static int u_audio_get_playback_rate(struct gaudio *card)
+{
+ return card->playback.rate;
+}
+
+/**
+ * Open ALSA PCM and control device files
+ * Initial the PCM or control device
+ */
+static int gaudio_open_snd_dev(struct gaudio *card)
+{
+ struct snd_pcm_file *pcm_file;
+ struct gaudio_snd_dev *snd;
+
+ if (!card)
+ return -ENODEV;
+
+ /* Open control device */
+ snd = &card->control;
+ snd->filp = filp_open(fn_cntl, O_RDWR, 0);
+ if (IS_ERR(snd->filp)) {
+ int ret = PTR_ERR(snd->filp);
+ ERROR(card, "unable to open sound control device file: %s\n",
+ fn_cntl);
+ snd->filp = NULL;
+ return ret;
+ }
+ snd->card = card;
+
+ /* Open PCM playback device and setup substream */
+ snd = &card->playback;
+ snd->filp = filp_open(fn_play, O_WRONLY, 0);
+ if (IS_ERR(snd->filp)) {
+ ERROR(card, "No such PCM playback device: %s\n", fn_play);
+ snd->filp = NULL;
+ }
+ pcm_file = snd->filp->private_data;
+ snd->substream = pcm_file->substream;
+ snd->card = card;
+ playback_default_hw_params(snd);
+
+ /* Open PCM capture device and setup substream */
+ snd = &card->capture;
+ snd->filp = filp_open(fn_cap, O_RDONLY, 0);
+ if (IS_ERR(snd->filp)) {
+ ERROR(card, "No such PCM capture device: %s\n", fn_cap);
+ snd->substream = NULL;
+ snd->card = NULL;
+ snd->filp = NULL;
+ } else {
+ pcm_file = snd->filp->private_data;
+ snd->substream = pcm_file->substream;
+ snd->card = card;
+ }
+
+ return 0;
+}
+
+/**
+ * Close ALSA PCM and control device files
+ */
+static int gaudio_close_snd_dev(struct gaudio *gau)
+{
+ struct gaudio_snd_dev *snd;
+
+ /* Close control device */
+ snd = &gau->control;
+ if (snd->filp)
+ filp_close(snd->filp, current->files);
+
+ /* Close PCM playback device and setup substream */
+ snd = &gau->playback;
+ if (snd->filp)
+ filp_close(snd->filp, current->files);
+
+ /* Close PCM capture device and setup substream */
+ snd = &gau->capture;
+ if (snd->filp)
+ filp_close(snd->filp, current->files);
+
+ return 0;
+}
+
+static struct gaudio *the_card;
+/**
+ * gaudio_setup - setup ALSA interface and preparing for USB transfer
+ *
+ * This sets up PCM, mixer or MIDI ALSA devices fore USB gadget using.
+ *
+ * Returns negative errno, or zero on success
+ */
+int __init gaudio_setup(struct gaudio *card)
+{
+ int ret;
+
+ ret = gaudio_open_snd_dev(card);
+ if (ret)
+ ERROR(card, "we need at least one control device\n");
+ else if (!the_card)
+ the_card = card;
+
+ return ret;
+
+}
+
+/**
+ * gaudio_cleanup - remove ALSA device interface
+ *
+ * This is called to free all resources allocated by @gaudio_setup().
+ */
+void gaudio_cleanup(void)
+{
+ if (the_card) {
+ gaudio_close_snd_dev(the_card);
+ the_card = NULL;
+ }
+}
+
--- /dev/null
+/*
+ * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __U_AUDIO_H
+#define __U_AUDIO_H
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/composite.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "gadget_chips.h"
+
+/*
+ * This represents the USB side of an audio card device, managed by a USB
+ * function which provides control and stream interfaces.
+ */
+
+struct gaudio_snd_dev {
+ struct gaudio *card;
+ struct file *filp;
+ struct snd_pcm_substream *substream;
+ int access;
+ int format;
+ int channels;
+ int rate;
+};
+
+struct gaudio {
+ struct usb_function func;
+ struct usb_gadget *gadget;
+
+ /* ALSA sound device interfaces */
+ struct gaudio_snd_dev control;
+ struct gaudio_snd_dev playback;
+ struct gaudio_snd_dev capture;
+
+ /* TODO */
+};
+
+int gaudio_setup(struct gaudio *card);
+void gaudio_cleanup(void);
+
+#endif /* __U_AUDIO_H */
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff