--- /dev/null
+/*
+ * gmidi.c -- USB MIDI Gadget Driver
+ *
+ * Copyright (C) 2006 Thumtronics Pty Ltd.
+ * Developed for Thumtronics by Grey Innovation
+ * Ben Williamson <ben.williamson@greyinnovation.com>
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * License ("GPL") version 2, as published by the Free Software Foundation.
+ *
+ * This code is based in part on:
+ *
+ * Gadget Zero driver, Copyright (C) 2003-2004 David Brownell.
+ * USB Audio driver, Copyright (C) 2002 by Takashi Iwai.
+ * USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch.
+ *
+ * Refer to the USB Device Class Definition for MIDI Devices:
+ * http://www.usb.org/developers/devclass_docs/midi10.pdf
+ */
+
+#define DEBUG 1
+// #define VERBOSE
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/utsname.h>
+#include <linux/device.h>
+#include <linux/moduleparam.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/rawmidi.h>
+
+#include <linux/usb_ch9.h>
+#include <linux/usb_gadget.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/midi.h>
+
+#include "gadget_chips.h"
+
+MODULE_AUTHOR("Ben Williamson");
+MODULE_LICENSE("GPL v2");
+
+#define DRIVER_VERSION "25 Jul 2006"
+
+static const char shortname[] = "g_midi";
+static const char longname[] = "MIDI Gadget";
+
+static int index = SNDRV_DEFAULT_IDX1;
+static char *id = SNDRV_DEFAULT_STR1;
+
+module_param(index, int, 0444);
+MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter.");
+module_param(id, charp, 0444);
+MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter.");
+
+/* Some systems will want different product identifers published in the
+ * device descriptor, either numbers or strings or both. These string
+ * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
+ */
+
+static ushort idVendor;
+module_param(idVendor, ushort, S_IRUGO);
+MODULE_PARM_DESC(idVendor, "USB Vendor ID");
+
+static ushort idProduct;
+module_param(idProduct, ushort, S_IRUGO);
+MODULE_PARM_DESC(idProduct, "USB Product ID");
+
+static ushort bcdDevice;
+module_param(bcdDevice, ushort, S_IRUGO);
+MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
+
+static char *iManufacturer;
+module_param(iManufacturer, charp, S_IRUGO);
+MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
+
+static char *iProduct;
+module_param(iProduct, charp, S_IRUGO);
+MODULE_PARM_DESC(iProduct, "USB Product string");
+
+static char *iSerialNumber;
+module_param(iSerialNumber, charp, S_IRUGO);
+MODULE_PARM_DESC(iSerialNumber, "SerialNumber");
+
+/*
+ * this version autoconfigures as much as possible,
+ * which is reasonable for most "bulk-only" drivers.
+ */
+static const char *EP_IN_NAME;
+static const char *EP_OUT_NAME;
+
+
+/* big enough to hold our biggest descriptor */
+#define USB_BUFSIZ 256
+
+
+/* This is a gadget, and the IN/OUT naming is from the host's perspective.
+ USB -> OUT endpoint -> rawmidi
+ USB <- IN endpoint <- rawmidi */
+struct gmidi_in_port {
+ struct gmidi_device* dev;
+ int active;
+ uint8_t cable; /* cable number << 4 */
+ uint8_t state;
+#define STATE_UNKNOWN 0
+#define STATE_1PARAM 1
+#define STATE_2PARAM_1 2
+#define STATE_2PARAM_2 3
+#define STATE_SYSEX_0 4
+#define STATE_SYSEX_1 5
+#define STATE_SYSEX_2 6
+ uint8_t data[2];
+};
+
+struct gmidi_device {
+ spinlock_t lock;
+ struct usb_gadget *gadget;
+ struct usb_request *req; /* for control responses */
+ u8 config;
+ struct usb_ep *in_ep, *out_ep;
+ struct snd_card *card;
+ struct snd_rawmidi *rmidi;
+ struct snd_rawmidi_substream *in_substream;
+ struct snd_rawmidi_substream *out_substream;
+
+ /* For the moment we only support one port in
+ each direction, but in_port is kept as a
+ separate struct so we can have more later. */
+ struct gmidi_in_port in_port;
+ unsigned long out_triggered;
+ struct tasklet_struct tasklet;
+};
+
+static void gmidi_transmit(struct gmidi_device* dev, struct usb_request* req);
+
+
+#define xprintk(d,level,fmt,args...) \
+ dev_printk(level , &(d)->gadget->dev , fmt , ## args)
+
+#ifdef DEBUG
+#define DBG(dev,fmt,args...) \
+ xprintk(dev , KERN_DEBUG , fmt , ## args)
+#else
+#define DBG(dev,fmt,args...) \
+ do { } while (0)
+#endif /* DEBUG */
+
+#ifdef VERBOSE
+#define VDBG DBG
+#else
+#define VDBG(dev,fmt,args...) \
+ do { } while (0)
+#endif /* VERBOSE */
+
+#define ERROR(dev,fmt,args...) \
+ xprintk(dev , KERN_ERR , fmt , ## args)
+#define WARN(dev,fmt,args...) \
+ xprintk(dev , KERN_WARNING , fmt , ## args)
+#define INFO(dev,fmt,args...) \
+ xprintk(dev , KERN_INFO , fmt , ## args)
+
+
+static unsigned buflen = 256;
+static unsigned qlen = 32;
+
+module_param(buflen, uint, S_IRUGO);
+module_param(qlen, uint, S_IRUGO);
+
+
+/* Thanks to Grey Innovation for donating this product ID.
+ *
+ * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
+ * Instead: allocate your own, using normal USB-IF procedures.
+ */
+#define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */
+#define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */
+
+
+/*
+ * DESCRIPTORS ... most are static, but strings and (full)
+ * configuration descriptors are built on demand.
+ */
+
+#define STRING_MANUFACTURER 25
+#define STRING_PRODUCT 42
+#define STRING_SERIAL 101
+#define STRING_MIDI_GADGET 250
+
+/* We only have the one configuration, it's number 1. */
+#define GMIDI_CONFIG 1
+
+/* We have two interfaces- AudioControl and MIDIStreaming */
+#define GMIDI_AC_INTERFACE 0
+#define GMIDI_MS_INTERFACE 1
+#define GMIDI_NUM_INTERFACES 2
+
+DECLARE_USB_AC_HEADER_DESCRIPTOR(1);
+DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
+DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(1);
+
+/* B.1 Device Descriptor */
+static struct usb_device_descriptor device_desc = {
+ .bLength = USB_DT_DEVICE_SIZE,
+ .bDescriptorType = USB_DT_DEVICE,
+ .bcdUSB = __constant_cpu_to_le16(0x0200),
+ .bDeviceClass = USB_CLASS_PER_INTERFACE,
+ .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM),
+ .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM),
+ .iManufacturer = STRING_MANUFACTURER,
+ .iProduct = STRING_PRODUCT,
+ .bNumConfigurations = 1,
+};
+
+/* B.2 Configuration Descriptor */
+static struct usb_config_descriptor config_desc = {
+ .bLength = USB_DT_CONFIG_SIZE,
+ .bDescriptorType = USB_DT_CONFIG,
+ /* compute wTotalLength on the fly */
+ .bNumInterfaces = GMIDI_NUM_INTERFACES,
+ .bConfigurationValue = GMIDI_CONFIG,
+ .iConfiguration = STRING_MIDI_GADGET,
+ /*
+ * FIXME: When embedding this driver in a device,
+ * these need to be set to reflect the actual
+ * power properties of the device. Is it selfpowered?
+ */
+ .bmAttributes = USB_CONFIG_ATT_ONE,
+ .bMaxPower = 1,
+};
+
+/* B.3.1 Standard AC Interface Descriptor */
+static const struct usb_interface_descriptor ac_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = GMIDI_AC_INTERFACE,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
+ .iInterface = STRING_MIDI_GADGET,
+};
+
+/* B.3.2 Class-Specific AC Interface Descriptor */
+static const struct usb_ac_header_descriptor_1 ac_header_desc = {
+ .bLength = USB_DT_AC_HEADER_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = USB_MS_HEADER,
+ .bcdADC = __constant_cpu_to_le16(0x0100),
+ .wTotalLength = USB_DT_AC_HEADER_SIZE(1),
+ .bInCollection = 1,
+ .baInterfaceNr = {
+ [0] = GMIDI_MS_INTERFACE,
+ }
+};
+
+/* B.4.1 Standard MS Interface Descriptor */
+static const struct usb_interface_descriptor ms_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = GMIDI_MS_INTERFACE,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
+ .iInterface = STRING_MIDI_GADGET,
+};
+
+/* B.4.2 Class-Specific MS Interface Descriptor */
+static const struct usb_ms_header_descriptor ms_header_desc = {
+ .bLength = USB_DT_MS_HEADER_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = USB_MS_HEADER,
+ .bcdMSC = __constant_cpu_to_le16(0x0100),
+ .wTotalLength = USB_DT_MS_HEADER_SIZE
+ + 2*USB_DT_MIDI_IN_SIZE
+ + 2*USB_DT_MIDI_OUT_SIZE(1),
+};
+
+#define JACK_IN_EMB 1
+#define JACK_IN_EXT 2
+#define JACK_OUT_EMB 3
+#define JACK_OUT_EXT 4
+
+/* B.4.3 MIDI IN Jack Descriptors */
+static const struct usb_midi_in_jack_descriptor jack_in_emb_desc = {
+ .bLength = USB_DT_MIDI_IN_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = USB_MS_MIDI_IN_JACK,
+ .bJackType = USB_MS_EMBEDDED,
+ .bJackID = JACK_IN_EMB,
+};
+
+static const struct usb_midi_in_jack_descriptor jack_in_ext_desc = {
+ .bLength = USB_DT_MIDI_IN_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = USB_MS_MIDI_IN_JACK,
+ .bJackType = USB_MS_EXTERNAL,
+ .bJackID = JACK_IN_EXT,
+};
+
+/* B.4.4 MIDI OUT Jack Descriptors */
+static const struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc = {
+ .bLength = USB_DT_MIDI_OUT_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = USB_MS_MIDI_OUT_JACK,
+ .bJackType = USB_MS_EMBEDDED,
+ .bJackID = JACK_OUT_EMB,
+ .bNrInputPins = 1,
+ .pins = {
+ [0] = {
+ .baSourceID = JACK_IN_EXT,
+ .baSourcePin = 1,
+ }
+ }
+};
+
+static const struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc = {
+ .bLength = USB_DT_MIDI_OUT_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = USB_MS_MIDI_OUT_JACK,
+ .bJackType = USB_MS_EXTERNAL,
+ .bJackID = JACK_OUT_EXT,
+ .bNrInputPins = 1,
+ .pins = {
+ [0] = {
+ .baSourceID = JACK_IN_EMB,
+ .baSourcePin = 1,
+ }
+ }
+};
+
+/* B.5.1 Standard Bulk OUT Endpoint Descriptor */
+static struct usb_endpoint_descriptor bulk_out_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+/* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */
+static const struct usb_ms_endpoint_descriptor_1 ms_out_desc = {
+ .bLength = USB_DT_MS_ENDPOINT_SIZE(1),
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+ .bDescriptorSubtype = USB_MS_GENERAL,
+ .bNumEmbMIDIJack = 1,
+ .baAssocJackID = {
+ [0] = JACK_IN_EMB,
+ }
+};
+
+/* B.6.1 Standard Bulk IN Endpoint Descriptor */
+static struct usb_endpoint_descriptor bulk_in_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+/* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */
+static const struct usb_ms_endpoint_descriptor_1 ms_in_desc = {
+ .bLength = USB_DT_MS_ENDPOINT_SIZE(1),
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+ .bDescriptorSubtype = USB_MS_GENERAL,
+ .bNumEmbMIDIJack = 1,
+ .baAssocJackID = {
+ [0] = JACK_OUT_EMB,
+ }
+};
+
+static const struct usb_descriptor_header *gmidi_function [] = {
+ (struct usb_descriptor_header *)&ac_interface_desc,
+ (struct usb_descriptor_header *)&ac_header_desc,
+ (struct usb_descriptor_header *)&ms_interface_desc,
+
+ (struct usb_descriptor_header *)&ms_header_desc,
+ (struct usb_descriptor_header *)&jack_in_emb_desc,
+ (struct usb_descriptor_header *)&jack_in_ext_desc,
+ (struct usb_descriptor_header *)&jack_out_emb_desc,
+ (struct usb_descriptor_header *)&jack_out_ext_desc,
+ /* If you add more jacks, update ms_header_desc.wTotalLength */
+
+ (struct usb_descriptor_header *)&bulk_out_desc,
+ (struct usb_descriptor_header *)&ms_out_desc,
+ (struct usb_descriptor_header *)&bulk_in_desc,
+ (struct usb_descriptor_header *)&ms_in_desc,
+ NULL,
+};
+
+static char manufacturer[50];
+static char product_desc[40] = "MIDI Gadget";
+static char serial_number[20];
+
+/* static strings, in UTF-8 */
+static struct usb_string strings [] = {
+ { STRING_MANUFACTURER, manufacturer, },
+ { STRING_PRODUCT, product_desc, },
+ { STRING_SERIAL, serial_number, },
+ { STRING_MIDI_GADGET, longname, },
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab = {
+ .language = 0x0409, /* en-us */
+ .strings = strings,
+};
+
+static int config_buf(struct usb_gadget *gadget,
+ u8 *buf, u8 type, unsigned index)
+{
+ int len;
+
+ /* only one configuration */
+ if (index != 0) {
+ return -EINVAL;
+ }
+ len = usb_gadget_config_buf(&config_desc,
+ buf, USB_BUFSIZ, gmidi_function);
+ if (len < 0) {
+ return len;
+ }
+ ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
+ return len;
+}
+
+static struct usb_request* alloc_ep_req(struct usb_ep *ep, unsigned length)
+{
+ struct usb_request *req;
+
+ req = usb_ep_alloc_request(ep, GFP_ATOMIC);
+ if (req) {
+ req->length = length;
+ req->buf = kmalloc(length, GFP_ATOMIC);
+ if (!req->buf) {
+ usb_ep_free_request(ep, req);
+ req = NULL;
+ }
+ }
+ return req;
+}
+
+static void free_ep_req(struct usb_ep *ep, struct usb_request *req)
+{
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+}
+
+static const uint8_t gmidi_cin_length[] = {
+ 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
+};
+
+/*
+ * Receives a chunk of MIDI data.
+ */
+static void gmidi_read_data(struct usb_ep *ep, int cable,
+ uint8_t* data, int length)
+{
+ struct gmidi_device *dev = ep->driver_data;
+ /* cable is ignored, because for now we only have one. */
+
+ if (!dev->out_substream) {
+ /* Nobody is listening - throw it on the floor. */
+ return;
+ }
+ if (!test_bit(dev->out_substream->number, &dev->out_triggered)) {
+ return;
+ }
+ snd_rawmidi_receive(dev->out_substream, data, length);
+}
+
+static void gmidi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
+{
+ unsigned i;
+ u8 *buf = req->buf;
+
+ for (i = 0; i + 3 < req->actual; i += 4) {
+ if (buf[i] != 0) {
+ int cable = buf[i] >> 4;
+ int length = gmidi_cin_length[buf[i] & 0x0f];
+ gmidi_read_data(ep, cable, &buf[i + 1], length);
+ }
+ }
+}
+
+static void gmidi_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct gmidi_device *dev = ep->driver_data;
+ int status = req->status;
+
+ switch (status) {
+ case 0: /* normal completion */
+ if (ep == dev->out_ep) {
+ /* we received stuff.
+ req is queued again, below */
+ gmidi_handle_out_data(ep, req);
+ } else if (ep == dev->in_ep) {
+ /* our transmit completed.
+ see if there's more to go.
+ gmidi_transmit eats req, don't queue it again. */
+ gmidi_transmit(dev, req);
+ return;
+ }
+ break;
+
+ /* this endpoint is normally active while we're configured */
+ case -ECONNABORTED: /* hardware forced ep reset */
+ case -ECONNRESET: /* request dequeued */
+ case -ESHUTDOWN: /* disconnect from host */
+ VDBG(dev, "%s gone (%d), %d/%d\n", ep->name, status,
+ req->actual, req->length);
+ if (ep == dev->out_ep) {
+ gmidi_handle_out_data(ep, req);
+ }
+ free_ep_req(ep, req);
+ return;
+
+ case -EOVERFLOW: /* buffer overrun on read means that
+ * we didn't provide a big enough
+ * buffer.
+ */
+ default:
+ DBG(dev, "%s complete --> %d, %d/%d\n", ep->name,
+ status, req->actual, req->length);
+ break;
+ case -EREMOTEIO: /* short read */
+ break;
+ }
+
+ status = usb_ep_queue(ep, req, GFP_ATOMIC);
+ if (status) {
+ ERROR(dev, "kill %s: resubmit %d bytes --> %d\n",
+ ep->name, req->length, status);
+ usb_ep_set_halt(ep);
+ /* FIXME recover later ... somehow */
+ }
+}
+
+static int set_gmidi_config(struct gmidi_device *dev, gfp_t gfp_flags)
+{
+ int err = 0;
+ struct usb_request *req;
+ struct usb_ep* ep;
+ unsigned i;
+
+ err = usb_ep_enable(dev->in_ep, &bulk_in_desc);
+ if (err) {
+ ERROR(dev, "can't start %s: %d\n", dev->in_ep->name, err);
+ goto fail;
+ }
+ dev->in_ep->driver_data = dev;
+
+ err = usb_ep_enable(dev->out_ep, &bulk_out_desc);
+ if (err) {
+ ERROR(dev, "can't start %s: %d\n", dev->out_ep->name, err);
+ goto fail;
+ }
+ dev->out_ep->driver_data = dev;
+
+ /* allocate a bunch of read buffers and queue them all at once. */
+ ep = dev->out_ep;
+ for (i = 0; i < qlen && err == 0; i++) {
+ req = alloc_ep_req(ep, buflen);
+ if (req) {
+ req->complete = gmidi_complete;
+ err = usb_ep_queue(ep, req, GFP_ATOMIC);
+ if (err) {
+ DBG(dev, "%s queue req: %d\n", ep->name, err);
+ }
+ } else {
+ err = -ENOMEM;
+ }
+ }
+fail:
+ /* caller is responsible for cleanup on error */
+ return err;
+}
+
+
+static void gmidi_reset_config(struct gmidi_device *dev)
+{
+ if (dev->config == 0) {
+ return;
+ }
+
+ DBG(dev, "reset config\n");
+
+ /* just disable endpoints, forcing completion of pending i/o.
+ * all our completion handlers free their requests in this case.
+ */
+ usb_ep_disable(dev->in_ep);
+ usb_ep_disable(dev->out_ep);
+ dev->config = 0;
+}
+
+/* change our operational config. this code must agree with the code
+ * that returns config descriptors, and altsetting code.
+ *
+ * it's also responsible for power management interactions. some
+ * configurations might not work with our current power sources.
+ *
+ * note that some device controller hardware will constrain what this
+ * code can do, perhaps by disallowing more than one configuration or
+ * by limiting configuration choices (like the pxa2xx).
+ */
+static int
+gmidi_set_config(struct gmidi_device *dev, unsigned number, gfp_t gfp_flags)
+{
+ int result = 0;
+ struct usb_gadget *gadget = dev->gadget;
+
+#if 0
+ /* FIXME */
+ /* Hacking this bit out fixes a bug where on receipt of two
+ USB_REQ_SET_CONFIGURATION messages, we end up with no
+ buffered OUT requests waiting for data. This is clearly
+ hiding a bug elsewhere, because if the config didn't
+ change then we really shouldn't do anything. */
+ /* Having said that, when we do "change" from config 1
+ to config 1, we at least gmidi_reset_config() which
+ clears out any requests on endpoints, so it's not like
+ we leak or anything. */
+ if (number == dev->config) {
+ return 0;
+ }
+#endif
+
+ if (gadget_is_sa1100(gadget) && dev->config) {
+ /* tx fifo is full, but we can't clear it...*/
+ INFO(dev, "can't change configurations\n");
+ return -ESPIPE;
+ }
+ gmidi_reset_config(dev);
+
+ switch (number) {
+ case GMIDI_CONFIG:
+ result = set_gmidi_config(dev, gfp_flags);
+ break;
+ default:
+ result = -EINVAL;
+ /* FALL THROUGH */
+ case 0:
+ return result;
+ }
+
+ if (!result && (!dev->in_ep || !dev->out_ep)) {
+ result = -ENODEV;
+ }
+ if (result) {
+ gmidi_reset_config(dev);
+ } else {
+ char *speed;
+
+ switch (gadget->speed) {
+ case USB_SPEED_LOW: speed = "low"; break;
+ case USB_SPEED_FULL: speed = "full"; break;
+ case USB_SPEED_HIGH: speed = "high"; break;
+ default: speed = "?"; break;
+ }
+
+ dev->config = number;
+ INFO(dev, "%s speed\n", speed);
+ }
+ return result;
+}
+
+
+static void gmidi_setup_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ if (req->status || req->actual != req->length) {
+ DBG((struct gmidi_device *) ep->driver_data,
+ "setup complete --> %d, %d/%d\n",
+ req->status, req->actual, req->length);
+ }
+}
+
+/*
+ * The setup() callback implements all the ep0 functionality that's
+ * not handled lower down, in hardware or the hardware driver (like
+ * device and endpoint feature flags, and their status). It's all
+ * housekeeping for the gadget function we're implementing. Most of
+ * the work is in config-specific setup.
+ */
+static int gmidi_setup(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct gmidi_device *dev = get_gadget_data(gadget);
+ struct usb_request *req = dev->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);
+
+ /* usually this stores reply data in the pre-allocated ep0 buffer,
+ * but config change events will reconfigure hardware.
+ */
+ req->zero = 0;
+ switch (ctrl->bRequest) {
+
+ case USB_REQ_GET_DESCRIPTOR:
+ if (ctrl->bRequestType != USB_DIR_IN) {
+ goto unknown;
+ }
+ switch (w_value >> 8) {
+
+ case USB_DT_DEVICE:
+ value = min(w_length, (u16) sizeof(device_desc));
+ memcpy(req->buf, &device_desc, value);
+ break;
+ case USB_DT_CONFIG:
+ value = config_buf(gadget, req->buf,
+ w_value >> 8,
+ w_value & 0xff);
+ if (value >= 0) {
+ value = min(w_length, (u16)value);
+ }
+ break;
+
+ case USB_DT_STRING:
+ /* wIndex == language code.
+ * this driver only handles one language, you can
+ * add string tables for other languages, using
+ * any UTF-8 characters
+ */
+ value = usb_gadget_get_string(&stringtab,
+ w_value & 0xff, req->buf);
+ if (value >= 0) {
+ value = min(w_length, (u16)value);
+ }
+ break;
+ }
+ break;
+
+ /* currently two configs, two speeds */
+ case USB_REQ_SET_CONFIGURATION:
+ if (ctrl->bRequestType != 0) {
+ goto unknown;
+ }
+ if (gadget->a_hnp_support) {
+ DBG(dev, "HNP available\n");
+ } else if (gadget->a_alt_hnp_support) {
+ DBG(dev, "HNP needs a different root port\n");
+ } else {
+ VDBG(dev, "HNP inactive\n");
+ }
+ spin_lock(&dev->lock);
+ value = gmidi_set_config(dev, w_value, GFP_ATOMIC);
+ spin_unlock(&dev->lock);
+ break;
+ case USB_REQ_GET_CONFIGURATION:
+ if (ctrl->bRequestType != USB_DIR_IN) {
+ goto unknown;
+ }
+ *(u8 *)req->buf = dev->config;
+ value = min(w_length, (u16)1);
+ break;
+
+ /* until we add altsetting support, or other interfaces,
+ * only 0/0 are possible. pxa2xx only supports 0/0 (poorly)
+ * and already killed pending endpoint I/O.
+ */
+ case USB_REQ_SET_INTERFACE:
+ if (ctrl->bRequestType != USB_RECIP_INTERFACE) {
+ goto unknown;
+ }
+ spin_lock(&dev->lock);
+ if (dev->config && w_index < GMIDI_NUM_INTERFACES
+ && w_value == 0)
+ {
+ u8 config = dev->config;
+
+ /* resets interface configuration, forgets about
+ * previous transaction state (queued bufs, etc)
+ * and re-inits endpoint state (toggle etc)
+ * no response queued, just zero status == success.
+ * if we had more than one interface we couldn't
+ * use this "reset the config" shortcut.
+ */
+ gmidi_reset_config(dev);
+ gmidi_set_config(dev, config, GFP_ATOMIC);
+ value = 0;
+ }
+ spin_unlock(&dev->lock);
+ break;
+ case USB_REQ_GET_INTERFACE:
+ if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) {
+ goto unknown;
+ }
+ if (!dev->config) {
+ break;
+ }
+ if (w_index >= GMIDI_NUM_INTERFACES) {
+ value = -EDOM;
+ break;
+ }
+ *(u8 *)req->buf = 0;
+ value = min(w_length, (u16)1);
+ break;
+
+ default:
+unknown:
+ VDBG(dev, "unknown 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 before status phase? */
+ if (value >= 0) {
+ req->length = value;
+ req->zero = value < w_length;
+ value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
+ if (value < 0) {
+ DBG(dev, "ep_queue --> %d\n", value);
+ req->status = 0;
+ gmidi_setup_complete(gadget->ep0, req);
+ }
+ }
+
+ /* device either stalls (value < 0) or reports success */
+ return value;
+}
+
+static void gmidi_disconnect(struct usb_gadget *gadget)
+{
+ struct gmidi_device *dev = get_gadget_data(gadget);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ gmidi_reset_config(dev);
+
+ /* a more significant application might have some non-usb
+ * activities to quiesce here, saving resources like power
+ * or pushing the notification up a network stack.
+ */
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* next we may get setup() calls to enumerate new connections;
+ * or an unbind() during shutdown (including removing module).
+ */
+}
+
+static void /* __init_or_exit */ gmidi_unbind(struct usb_gadget *gadget)
+{
+ struct gmidi_device *dev = get_gadget_data(gadget);
+ struct snd_card* card;
+
+ DBG(dev, "unbind\n");
+
+ card = dev->card;
+ dev->card = NULL;
+ if (card) {
+ snd_card_free(card);
+ }
+
+ /* we've already been disconnected ... no i/o is active */
+ if (dev->req) {
+ dev->req->length = USB_BUFSIZ;
+ free_ep_req(gadget->ep0, dev->req);
+ }
+ kfree(dev);
+ set_gadget_data(gadget, NULL);
+}
+
+static int gmidi_snd_free(struct snd_device *device)
+{
+ return 0;
+}
+
+static void gmidi_transmit_packet(struct usb_request* req, uint8_t p0,
+ uint8_t p1, uint8_t p2, uint8_t p3)
+{
+ unsigned length = req->length;
+
+ uint8_t* buf = (uint8_t*)req->buf + length;
+ buf[0] = p0;
+ buf[1] = p1;
+ buf[2] = p2;
+ buf[3] = p3;
+ req->length = length + 4;
+}
+
+/*
+ * Converts MIDI commands to USB MIDI packets.
+ */
+static void gmidi_transmit_byte(struct usb_request* req,
+ struct gmidi_in_port* port, uint8_t b)
+{
+ uint8_t p0 = port->cable;
+
+ if (b >= 0xf8) {
+ gmidi_transmit_packet(req, p0 | 0x0f, b, 0, 0);
+ } else if (b >= 0xf0) {
+ switch (b) {
+ case 0xf0:
+ port->data[0] = b;
+ port->state = STATE_SYSEX_1;
+ break;
+ case 0xf1:
+ case 0xf3:
+ port->data[0] = b;
+ port->state = STATE_1PARAM;
+ break;
+ case 0xf2:
+ port->data[0] = b;
+ port->state = STATE_2PARAM_1;
+ break;
+ case 0xf4:
+ case 0xf5:
+ port->state = STATE_UNKNOWN;
+ break;
+ case 0xf6:
+ gmidi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0);
+ port->state = STATE_UNKNOWN;
+ break;
+ case 0xf7:
+ switch (port->state) {
+ case STATE_SYSEX_0:
+ gmidi_transmit_packet(req,
+ p0 | 0x05, 0xf7, 0, 0);
+ break;
+ case STATE_SYSEX_1:
+ gmidi_transmit_packet(req,
+ p0 | 0x06, port->data[0], 0xf7, 0);
+ break;
+ case STATE_SYSEX_2:
+ gmidi_transmit_packet(req,
+ p0 | 0x07, port->data[0],
+ port->data[1], 0xf7);
+ break;
+ }
+ port->state = STATE_UNKNOWN;
+ break;
+ }
+ } else if (b >= 0x80) {
+ port->data[0] = b;
+ if (b >= 0xc0 && b <= 0xdf)
+ port->state = STATE_1PARAM;
+ else
+ port->state = STATE_2PARAM_1;
+ } else { /* b < 0x80 */
+ switch (port->state) {
+ case STATE_1PARAM:
+ if (port->data[0] < 0xf0) {
+ p0 |= port->data[0] >> 4;
+ } else {
+ p0 |= 0x02;
+ port->state = STATE_UNKNOWN;
+ }
+ gmidi_transmit_packet(req, p0, port->data[0], b, 0);
+ break;
+ case STATE_2PARAM_1:
+ port->data[1] = b;
+ port->state = STATE_2PARAM_2;
+ break;
+ case STATE_2PARAM_2:
+ if (port->data[0] < 0xf0) {
+ p0 |= port->data[0] >> 4;
+ port->state = STATE_2PARAM_1;
+ } else {
+ p0 |= 0x03;
+ port->state = STATE_UNKNOWN;
+ }
+ gmidi_transmit_packet(req,
+ p0, port->data[0], port->data[1], b);
+ break;
+ case STATE_SYSEX_0:
+ port->data[0] = b;
+ port->state = STATE_SYSEX_1;
+ break;
+ case STATE_SYSEX_1:
+ port->data[1] = b;
+ port->state = STATE_SYSEX_2;
+ break;
+ case STATE_SYSEX_2:
+ gmidi_transmit_packet(req,
+ p0 | 0x04, port->data[0], port->data[1], b);
+ port->state = STATE_SYSEX_0;
+ break;
+ }
+ }
+}
+
+static void gmidi_transmit(struct gmidi_device* dev, struct usb_request* req)
+{
+ struct usb_ep* ep = dev->in_ep;
+ struct gmidi_in_port* port = &dev->in_port;
+
+ if (!ep) {
+ return;
+ }
+ if (!req) {
+ req = alloc_ep_req(ep, buflen);
+ }
+ if (!req) {
+ ERROR(dev, "gmidi_transmit: alloc_ep_request failed\n");
+ return;
+ }
+ req->length = 0;
+ req->complete = gmidi_complete;
+
+ if (port->active) {
+ while (req->length + 3 < buflen) {
+ uint8_t b;
+ if (snd_rawmidi_transmit(dev->in_substream, &b, 1)
+ != 1)
+ {
+ port->active = 0;
+ break;
+ }
+ gmidi_transmit_byte(req, port, b);
+ }
+ }
+ if (req->length > 0) {
+ usb_ep_queue(ep, req, GFP_ATOMIC);
+ } else {
+ free_ep_req(ep, req);
+ }
+}
+
+static void gmidi_in_tasklet(unsigned long data)
+{
+ struct gmidi_device* dev = (struct gmidi_device*)data;
+
+ gmidi_transmit(dev, NULL);
+}
+
+static int gmidi_in_open(struct snd_rawmidi_substream *substream)
+{
+ struct gmidi_device* dev = substream->rmidi->private_data;
+
+ VDBG(dev, "gmidi_in_open\n");
+ dev->in_substream = substream;
+ dev->in_port.state = STATE_UNKNOWN;
+ return 0;
+}
+
+static int gmidi_in_close(struct snd_rawmidi_substream *substream)
+{
+ VDBG(dev, "gmidi_in_close\n");
+ return 0;
+}
+
+static void gmidi_in_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+ struct gmidi_device* dev = substream->rmidi->private_data;
+
+ VDBG(dev, "gmidi_in_trigger %d\n", up);
+ dev->in_port.active = up;
+ if (up) {
+ tasklet_hi_schedule(&dev->tasklet);
+ }
+}
+
+static int gmidi_out_open(struct snd_rawmidi_substream *substream)
+{
+ struct gmidi_device* dev = substream->rmidi->private_data;
+
+ VDBG(dev, "gmidi_out_open\n");
+ dev->out_substream = substream;
+ return 0;
+}
+
+static int gmidi_out_close(struct snd_rawmidi_substream *substream)
+{
+ VDBG(dev, "gmidi_out_close\n");
+ return 0;
+}
+
+static void gmidi_out_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+ struct gmidi_device* dev = substream->rmidi->private_data;
+
+ VDBG(dev, "gmidi_out_trigger %d\n", up);
+ if (up) {
+ set_bit(substream->number, &dev->out_triggered);
+ } else {
+ clear_bit(substream->number, &dev->out_triggered);
+ }
+}
+
+static struct snd_rawmidi_ops gmidi_in_ops = {
+ .open = gmidi_in_open,
+ .close = gmidi_in_close,
+ .trigger = gmidi_in_trigger,
+};
+
+static struct snd_rawmidi_ops gmidi_out_ops = {
+ .open = gmidi_out_open,
+ .close = gmidi_out_close,
+ .trigger = gmidi_out_trigger
+};
+
+/* register as a sound "card" */
+static int gmidi_register_card(struct gmidi_device *dev)
+{
+ struct snd_card *card;
+ struct snd_rawmidi *rmidi;
+ int err;
+ int out_ports = 1;
+ int in_ports = 1;
+ static struct snd_device_ops ops = {
+ .dev_free = gmidi_snd_free,
+ };
+
+ card = snd_card_new(index, id, THIS_MODULE, 0);
+ if (!card) {
+ ERROR(dev, "snd_card_new failed\n");
+ err = -ENOMEM;
+ goto fail;
+ }
+ dev->card = card;
+
+ err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, dev, &ops);
+ if (err < 0) {
+ ERROR(dev, "snd_device_new failed: error %d\n", err);
+ goto fail;
+ }
+
+ strcpy(card->driver, longname);
+ strcpy(card->longname, longname);
+ strcpy(card->shortname, shortname);
+
+ /* Set up rawmidi */
+ dev->in_port.dev = dev;
+ dev->in_port.active = 0;
+ snd_component_add(card, "MIDI");
+ err = snd_rawmidi_new(card, "USB MIDI Gadget", 0,
+ out_ports, in_ports, &rmidi);
+ if (err < 0) {
+ ERROR(dev, "snd_rawmidi_new failed: error %d\n", err);
+ goto fail;
+ }
+ dev->rmidi = rmidi;
+ strcpy(rmidi->name, card->shortname);
+ rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
+ SNDRV_RAWMIDI_INFO_INPUT |
+ SNDRV_RAWMIDI_INFO_DUPLEX;
+ rmidi->private_data = dev;
+
+ /* Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT.
+ It's an upside-down world being a gadget. */
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
+
+ snd_card_set_dev(card, &dev->gadget->dev);
+
+ /* register it - we're ready to go */
+ err = snd_card_register(card);
+ if (err < 0) {
+ ERROR(dev, "snd_card_register failed\n");
+ goto fail;
+ }
+
+ VDBG(dev, "gmidi_register_card finished ok\n");
+ return 0;
+
+fail:
+ if (dev->card) {
+ snd_card_free(dev->card);
+ dev->card = NULL;
+ }
+ return err;
+}
+
+/*
+ * Creates an output endpoint, and initializes output ports.
+ */
+static int __devinit gmidi_bind(struct usb_gadget *gadget)
+{
+ struct gmidi_device *dev;
+ struct usb_ep *in_ep, *out_ep;
+ int gcnum, err = 0;
+
+ /* support optional vendor/distro customization */
+ if (idVendor) {
+ if (!idProduct) {
+ printk(KERN_ERR "idVendor needs idProduct!\n");
+ return -ENODEV;
+ }
+ device_desc.idVendor = cpu_to_le16(idVendor);
+ device_desc.idProduct = cpu_to_le16(idProduct);
+ if (bcdDevice) {
+ device_desc.bcdDevice = cpu_to_le16(bcdDevice);
+ }
+ }
+ if (iManufacturer) {
+ strlcpy(manufacturer, iManufacturer, sizeof(manufacturer));
+ } else {
+ snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
+ system_utsname.sysname, system_utsname.release,
+ gadget->name);
+ }
+ if (iProduct) {
+ strlcpy(product_desc, iProduct, sizeof(product_desc));
+ }
+ if (iSerialNumber) {
+ device_desc.iSerialNumber = STRING_SERIAL,
+ strlcpy(serial_number, iSerialNumber, sizeof(serial_number));
+ }
+
+ /* Bulk-only drivers like this one SHOULD be able to
+ * autoconfigure on any sane usb controller driver,
+ * but there may also be important quirks to address.
+ */
+ usb_ep_autoconfig_reset(gadget);
+ in_ep = usb_ep_autoconfig(gadget, &bulk_in_desc);
+ if (!in_ep) {
+autoconf_fail:
+ printk(KERN_ERR "%s: can't autoconfigure on %s\n",
+ shortname, gadget->name);
+ return -ENODEV;
+ }
+ EP_IN_NAME = in_ep->name;
+ in_ep->driver_data = in_ep; /* claim */
+
+ out_ep = usb_ep_autoconfig(gadget, &bulk_out_desc);
+ if (!out_ep) {
+ goto autoconf_fail;
+ }
+ EP_OUT_NAME = out_ep->name;
+ out_ep->driver_data = out_ep; /* claim */
+
+ gcnum = usb_gadget_controller_number(gadget);
+ if (gcnum >= 0) {
+ device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
+ } else {
+ /* gmidi is so simple (no altsettings) that
+ * it SHOULD NOT have problems with bulk-capable hardware.
+ * so warn about unrecognized controllers, don't panic.
+ */
+ printk(KERN_WARNING "%s: controller '%s' not recognized\n",
+ shortname, gadget->name);
+ device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
+ }
+
+
+ /* ok, we made sense of the hardware ... */
+ dev = kzalloc(sizeof(*dev), SLAB_KERNEL);
+ if (!dev) {
+ return -ENOMEM;
+ }
+ spin_lock_init(&dev->lock);
+ dev->gadget = gadget;
+ dev->in_ep = in_ep;
+ dev->out_ep = out_ep;
+ set_gadget_data(gadget, dev);
+ tasklet_init(&dev->tasklet, gmidi_in_tasklet, (unsigned long)dev);
+
+ /* preallocate control response and buffer */
+ dev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
+ if (!dev->req) {
+ err = -ENOMEM;
+ goto fail;
+ }
+ dev->req->buf = usb_ep_alloc_buffer(gadget->ep0, USB_BUFSIZ,
+ &dev->req->dma, GFP_KERNEL);
+ if (!dev->req->buf) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ dev->req->complete = gmidi_setup_complete;
+
+ device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
+
+ gadget->ep0->driver_data = dev;
+
+ INFO(dev, "%s, version: " DRIVER_VERSION "\n", longname);
+ INFO(dev, "using %s, OUT %s IN %s\n", gadget->name,
+ EP_OUT_NAME, EP_IN_NAME);
+
+ /* register as an ALSA sound card */
+ err = gmidi_register_card(dev);
+ if (err < 0) {
+ goto fail;
+ }
+
+ VDBG(dev, "gmidi_bind finished ok\n");
+ return 0;
+
+fail:
+ gmidi_unbind(gadget);
+ return err;
+}
+
+
+static void gmidi_suspend(struct usb_gadget *gadget)
+{
+ struct gmidi_device *dev = get_gadget_data(gadget);
+
+ if (gadget->speed == USB_SPEED_UNKNOWN) {
+ return;
+ }
+
+ DBG(dev, "suspend\n");
+}
+
+static void gmidi_resume(struct usb_gadget *gadget)
+{
+ struct gmidi_device *dev = get_gadget_data(gadget);
+
+ DBG(dev, "resume\n");
+}
+
+
+static struct usb_gadget_driver gmidi_driver = {
+ .speed = USB_SPEED_FULL,
+ .function = (char *)longname,
+ .bind = gmidi_bind,
+ .unbind = __exit_p(gmidi_unbind),
+
+ .setup = gmidi_setup,
+ .disconnect = gmidi_disconnect,
+
+ .suspend = gmidi_suspend,
+ .resume = gmidi_resume,
+
+ .driver = {
+ .name = (char *)shortname,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init gmidi_init(void)
+{
+ return usb_gadget_register_driver(&gmidi_driver);
+}
+module_init(gmidi_init);
+
+static void __exit gmidi_cleanup(void)
+{
+ usb_gadget_unregister_driver(&gmidi_driver);
+}
+module_exit(gmidi_cleanup);
+
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff