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f_uac1.c
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1 /*
2  * f_audio.c -- USB Audio class function driver
3  *
4  * Copyright (C) 2008 Bryan Wu <[email protected]>
5  * Copyright (C) 2008 Analog Devices, Inc
6  *
7  * Enter bugs at http://blackfin.uclinux.org/
8  *
9  * Licensed under the GPL-2 or later.
10  */
11 
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/device.h>
15 #include <linux/atomic.h>
16 
17 #include "u_uac1.h"
18 
19 #define OUT_EP_MAX_PACKET_SIZE 200
20 static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
21 module_param(req_buf_size, int, S_IRUGO);
22 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
23 
24 static int req_count = 256;
25 module_param(req_count, int, S_IRUGO);
26 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
27 
28 static int audio_buf_size = 48000;
29 module_param(audio_buf_size, int, S_IRUGO);
30 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
31 
32 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
33 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
34 
35 /*
36  * DESCRIPTORS ... most are static, but strings and full
37  * configuration descriptors are built on demand.
38  */
39 
40 /*
41  * We have two interfaces- AudioControl and AudioStreaming
42  * TODO: only supcard playback currently
43  */
44 #define F_AUDIO_AC_INTERFACE 0
45 #define F_AUDIO_AS_INTERFACE 1
46 #define F_AUDIO_NUM_INTERFACES 2
47 
48 /* B.3.1 Standard AC Interface Descriptor */
49 static struct usb_interface_descriptor ac_interface_desc __initdata = {
50  .bLength = USB_DT_INTERFACE_SIZE,
51  .bDescriptorType = USB_DT_INTERFACE,
52  .bNumEndpoints = 0,
53  .bInterfaceClass = USB_CLASS_AUDIO,
54  .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
55 };
56 
57 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
58 
59 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
60 /* 1 input terminal, 1 output terminal and 1 feature unit */
61 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
62  + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
63 /* B.3.2 Class-Specific AC Interface Descriptor */
64 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
65  .bLength = UAC_DT_AC_HEADER_LENGTH,
66  .bDescriptorType = USB_DT_CS_INTERFACE,
67  .bDescriptorSubtype = UAC_HEADER,
68  .bcdADC = __constant_cpu_to_le16(0x0100),
69  .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
70  .bInCollection = F_AUDIO_NUM_INTERFACES,
71  .baInterfaceNr = {
72  [0] = F_AUDIO_AC_INTERFACE,
73  [1] = F_AUDIO_AS_INTERFACE,
74  }
75 };
76 
77 #define INPUT_TERMINAL_ID 1
78 static struct uac_input_terminal_descriptor input_terminal_desc = {
79  .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
80  .bDescriptorType = USB_DT_CS_INTERFACE,
81  .bDescriptorSubtype = UAC_INPUT_TERMINAL,
82  .bTerminalID = INPUT_TERMINAL_ID,
83  .wTerminalType = UAC_TERMINAL_STREAMING,
84  .bAssocTerminal = 0,
85  .wChannelConfig = 0x3,
86 };
87 
88 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
89 
90 #define FEATURE_UNIT_ID 2
91 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
92  .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
93  .bDescriptorType = USB_DT_CS_INTERFACE,
94  .bDescriptorSubtype = UAC_FEATURE_UNIT,
95  .bUnitID = FEATURE_UNIT_ID,
96  .bSourceID = INPUT_TERMINAL_ID,
97  .bControlSize = 2,
98  .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
99 };
100 
101 static struct usb_audio_control mute_control = {
102  .list = LIST_HEAD_INIT(mute_control.list),
103  .name = "Mute Control",
104  .type = UAC_FU_MUTE,
105  /* Todo: add real Mute control code */
106  .set = generic_set_cmd,
107  .get = generic_get_cmd,
108 };
109 
110 static struct usb_audio_control volume_control = {
111  .list = LIST_HEAD_INIT(volume_control.list),
112  .name = "Volume Control",
113  .type = UAC_FU_VOLUME,
114  /* Todo: add real Volume control code */
115  .set = generic_set_cmd,
116  .get = generic_get_cmd,
117 };
118 
119 static struct usb_audio_control_selector feature_unit = {
120  .list = LIST_HEAD_INIT(feature_unit.list),
121  .id = FEATURE_UNIT_ID,
122  .name = "Mute & Volume Control",
123  .type = UAC_FEATURE_UNIT,
124  .desc = (struct usb_descriptor_header *)&feature_unit_desc,
125 };
126 
127 #define OUTPUT_TERMINAL_ID 3
128 static struct uac1_output_terminal_descriptor output_terminal_desc = {
129  .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
130  .bDescriptorType = USB_DT_CS_INTERFACE,
131  .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
132  .bTerminalID = OUTPUT_TERMINAL_ID,
133  .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
134  .bAssocTerminal = FEATURE_UNIT_ID,
135  .bSourceID = FEATURE_UNIT_ID,
136 };
137 
138 /* B.4.1 Standard AS Interface Descriptor */
139 static struct usb_interface_descriptor as_interface_alt_0_desc = {
140  .bLength = USB_DT_INTERFACE_SIZE,
141  .bDescriptorType = USB_DT_INTERFACE,
142  .bAlternateSetting = 0,
143  .bNumEndpoints = 0,
144  .bInterfaceClass = USB_CLASS_AUDIO,
145  .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
146 };
147 
148 static struct usb_interface_descriptor as_interface_alt_1_desc = {
149  .bLength = USB_DT_INTERFACE_SIZE,
150  .bDescriptorType = USB_DT_INTERFACE,
151  .bAlternateSetting = 1,
152  .bNumEndpoints = 1,
153  .bInterfaceClass = USB_CLASS_AUDIO,
154  .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
155 };
156 
157 /* B.4.2 Class-Specific AS Interface Descriptor */
158 static struct uac1_as_header_descriptor as_header_desc = {
159  .bLength = UAC_DT_AS_HEADER_SIZE,
160  .bDescriptorType = USB_DT_CS_INTERFACE,
161  .bDescriptorSubtype = UAC_AS_GENERAL,
162  .bTerminalLink = INPUT_TERMINAL_ID,
163  .bDelay = 1,
164  .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
165 };
166 
167 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
168 
169 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
170  .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
171  .bDescriptorType = USB_DT_CS_INTERFACE,
172  .bDescriptorSubtype = UAC_FORMAT_TYPE,
173  .bFormatType = UAC_FORMAT_TYPE_I,
174  .bSubframeSize = 2,
175  .bBitResolution = 16,
176  .bSamFreqType = 1,
177 };
178 
179 /* Standard ISO OUT Endpoint Descriptor */
180 static struct usb_endpoint_descriptor as_out_ep_desc = {
181  .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
182  .bDescriptorType = USB_DT_ENDPOINT,
183  .bEndpointAddress = USB_DIR_OUT,
184  .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
185  | USB_ENDPOINT_XFER_ISOC,
186  .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
187  .bInterval = 4,
188 };
189 
190 /* Class-specific AS ISO OUT Endpoint Descriptor */
191 static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
192  .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
193  .bDescriptorType = USB_DT_CS_ENDPOINT,
194  .bDescriptorSubtype = UAC_EP_GENERAL,
195  .bmAttributes = 1,
196  .bLockDelayUnits = 1,
197  .wLockDelay = __constant_cpu_to_le16(1),
198 };
199 
200 static struct usb_descriptor_header *f_audio_desc[] __initdata = {
201  (struct usb_descriptor_header *)&ac_interface_desc,
202  (struct usb_descriptor_header *)&ac_header_desc,
203 
204  (struct usb_descriptor_header *)&input_terminal_desc,
205  (struct usb_descriptor_header *)&output_terminal_desc,
206  (struct usb_descriptor_header *)&feature_unit_desc,
207 
208  (struct usb_descriptor_header *)&as_interface_alt_0_desc,
209  (struct usb_descriptor_header *)&as_interface_alt_1_desc,
210  (struct usb_descriptor_header *)&as_header_desc,
211 
212  (struct usb_descriptor_header *)&as_type_i_desc,
213 
214  (struct usb_descriptor_header *)&as_out_ep_desc,
215  (struct usb_descriptor_header *)&as_iso_out_desc,
216  NULL,
217 };
218 
219 /*
220  * This function is an ALSA sound card following USB Audio Class Spec 1.0.
221  */
222 
223 /*-------------------------------------------------------------------------*/
224 struct f_audio_buf {
225  u8 *buf;
226  int actual;
227  struct list_head list;
228 };
229 
230 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
231 {
232  struct f_audio_buf *copy_buf;
233 
234  copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
235  if (!copy_buf)
236  return ERR_PTR(-ENOMEM);
237 
238  copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
239  if (!copy_buf->buf) {
240  kfree(copy_buf);
241  return ERR_PTR(-ENOMEM);
242  }
243 
244  return copy_buf;
245 }
246 
247 static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
248 {
249  kfree(audio_buf->buf);
250  kfree(audio_buf);
251 }
252 /*-------------------------------------------------------------------------*/
253 
254 struct f_audio {
255  struct gaudio card;
256 
257  /* endpoints handle full and/or high speeds */
258  struct usb_ep *out_ep;
259 
260  spinlock_t lock;
261  struct f_audio_buf *copy_buf;
262  struct work_struct playback_work;
263  struct list_head play_queue;
264 
265  /* Control Set command */
266  struct list_head cs;
267  u8 set_cmd;
268  struct usb_audio_control *set_con;
269 };
270 
271 static inline struct f_audio *func_to_audio(struct usb_function *f)
272 {
273  return container_of(f, struct f_audio, card.func);
274 }
275 
276 /*-------------------------------------------------------------------------*/
277 
278 static void f_audio_playback_work(struct work_struct *data)
279 {
280  struct f_audio *audio = container_of(data, struct f_audio,
281  playback_work);
282  struct f_audio_buf *play_buf;
283 
284  spin_lock_irq(&audio->lock);
285  if (list_empty(&audio->play_queue)) {
286  spin_unlock_irq(&audio->lock);
287  return;
288  }
289  play_buf = list_first_entry(&audio->play_queue,
290  struct f_audio_buf, list);
291  list_del(&play_buf->list);
292  spin_unlock_irq(&audio->lock);
293 
294  u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
295  f_audio_buffer_free(play_buf);
296 }
297 
298 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
299 {
300  struct f_audio *audio = req->context;
301  struct usb_composite_dev *cdev = audio->card.func.config->cdev;
302  struct f_audio_buf *copy_buf = audio->copy_buf;
303  int err;
304 
305  if (!copy_buf)
306  return -EINVAL;
307 
308  /* Copy buffer is full, add it to the play_queue */
309  if (audio_buf_size - copy_buf->actual < req->actual) {
310  list_add_tail(&copy_buf->list, &audio->play_queue);
311  schedule_work(&audio->playback_work);
312  copy_buf = f_audio_buffer_alloc(audio_buf_size);
313  if (IS_ERR(copy_buf))
314  return -ENOMEM;
315  }
316 
317  memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
318  copy_buf->actual += req->actual;
319  audio->copy_buf = copy_buf;
320 
321  err = usb_ep_queue(ep, req, GFP_ATOMIC);
322  if (err)
323  ERROR(cdev, "%s queue req: %d\n", ep->name, err);
324 
325  return 0;
326 
327 }
328 
329 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
330 {
331  struct f_audio *audio = req->context;
332  int status = req->status;
333  u32 data = 0;
334  struct usb_ep *out_ep = audio->out_ep;
335 
336  switch (status) {
337 
338  case 0: /* normal completion? */
339  if (ep == out_ep)
340  f_audio_out_ep_complete(ep, req);
341  else if (audio->set_con) {
342  memcpy(&data, req->buf, req->length);
343  audio->set_con->set(audio->set_con, audio->set_cmd,
344  le16_to_cpu(data));
345  audio->set_con = NULL;
346  }
347  break;
348  default:
349  break;
350  }
351 }
352 
353 static int audio_set_intf_req(struct usb_function *f,
354  const struct usb_ctrlrequest *ctrl)
355 {
356  struct f_audio *audio = func_to_audio(f);
357  struct usb_composite_dev *cdev = f->config->cdev;
358  struct usb_request *req = cdev->req;
359  u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
360  u16 len = le16_to_cpu(ctrl->wLength);
361  u16 w_value = le16_to_cpu(ctrl->wValue);
362  u8 con_sel = (w_value >> 8) & 0xFF;
363  u8 cmd = (ctrl->bRequest & 0x0F);
364  struct usb_audio_control_selector *cs;
365  struct usb_audio_control *con;
366 
367  DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
368  ctrl->bRequest, w_value, len, id);
369 
370  list_for_each_entry(cs, &audio->cs, list) {
371  if (cs->id == id) {
372  list_for_each_entry(con, &cs->control, list) {
373  if (con->type == con_sel) {
374  audio->set_con = con;
375  break;
376  }
377  }
378  break;
379  }
380  }
381 
382  audio->set_cmd = cmd;
383  req->context = audio;
384  req->complete = f_audio_complete;
385 
386  return len;
387 }
388 
389 static int audio_get_intf_req(struct usb_function *f,
390  const struct usb_ctrlrequest *ctrl)
391 {
392  struct f_audio *audio = func_to_audio(f);
393  struct usb_composite_dev *cdev = f->config->cdev;
394  struct usb_request *req = cdev->req;
395  int value = -EOPNOTSUPP;
396  u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
397  u16 len = le16_to_cpu(ctrl->wLength);
398  u16 w_value = le16_to_cpu(ctrl->wValue);
399  u8 con_sel = (w_value >> 8) & 0xFF;
400  u8 cmd = (ctrl->bRequest & 0x0F);
401  struct usb_audio_control_selector *cs;
402  struct usb_audio_control *con;
403 
404  DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
405  ctrl->bRequest, w_value, len, id);
406 
407  list_for_each_entry(cs, &audio->cs, list) {
408  if (cs->id == id) {
409  list_for_each_entry(con, &cs->control, list) {
410  if (con->type == con_sel && con->get) {
411  value = con->get(con, cmd);
412  break;
413  }
414  }
415  break;
416  }
417  }
418 
419  req->context = audio;
420  req->complete = f_audio_complete;
421  memcpy(req->buf, &value, len);
422 
423  return len;
424 }
425 
426 static int audio_set_endpoint_req(struct usb_function *f,
427  const struct usb_ctrlrequest *ctrl)
428 {
429  struct usb_composite_dev *cdev = f->config->cdev;
430  int value = -EOPNOTSUPP;
431  u16 ep = le16_to_cpu(ctrl->wIndex);
432  u16 len = le16_to_cpu(ctrl->wLength);
433  u16 w_value = le16_to_cpu(ctrl->wValue);
434 
435  DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
436  ctrl->bRequest, w_value, len, ep);
437 
438  switch (ctrl->bRequest) {
439  case UAC_SET_CUR:
440  value = len;
441  break;
442 
443  case UAC_SET_MIN:
444  break;
445 
446  case UAC_SET_MAX:
447  break;
448 
449  case UAC_SET_RES:
450  break;
451 
452  case UAC_SET_MEM:
453  break;
454 
455  default:
456  break;
457  }
458 
459  return value;
460 }
461 
462 static int audio_get_endpoint_req(struct usb_function *f,
463  const struct usb_ctrlrequest *ctrl)
464 {
465  struct usb_composite_dev *cdev = f->config->cdev;
466  int value = -EOPNOTSUPP;
467  u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
468  u16 len = le16_to_cpu(ctrl->wLength);
469  u16 w_value = le16_to_cpu(ctrl->wValue);
470 
471  DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
472  ctrl->bRequest, w_value, len, ep);
473 
474  switch (ctrl->bRequest) {
475  case UAC_GET_CUR:
476  case UAC_GET_MIN:
477  case UAC_GET_MAX:
478  case UAC_GET_RES:
479  value = len;
480  break;
481  case UAC_GET_MEM:
482  break;
483  default:
484  break;
485  }
486 
487  return value;
488 }
489 
490 static int
491 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
492 {
493  struct usb_composite_dev *cdev = f->config->cdev;
494  struct usb_request *req = cdev->req;
495  int value = -EOPNOTSUPP;
496  u16 w_index = le16_to_cpu(ctrl->wIndex);
497  u16 w_value = le16_to_cpu(ctrl->wValue);
498  u16 w_length = le16_to_cpu(ctrl->wLength);
499 
500  /* composite driver infrastructure handles everything; interface
501  * activation uses set_alt().
502  */
503  switch (ctrl->bRequestType) {
504  case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
505  value = audio_set_intf_req(f, ctrl);
506  break;
507 
508  case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
509  value = audio_get_intf_req(f, ctrl);
510  break;
511 
512  case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
513  value = audio_set_endpoint_req(f, ctrl);
514  break;
515 
516  case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
517  value = audio_get_endpoint_req(f, ctrl);
518  break;
519 
520  default:
521  ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
522  ctrl->bRequestType, ctrl->bRequest,
523  w_value, w_index, w_length);
524  }
525 
526  /* respond with data transfer or status phase? */
527  if (value >= 0) {
528  DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
529  ctrl->bRequestType, ctrl->bRequest,
530  w_value, w_index, w_length);
531  req->zero = 0;
532  req->length = value;
533  value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
534  if (value < 0)
535  ERROR(cdev, "audio response on err %d\n", value);
536  }
537 
538  /* device either stalls (value < 0) or reports success */
539  return value;
540 }
541 
542 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
543 {
544  struct f_audio *audio = func_to_audio(f);
545  struct usb_composite_dev *cdev = f->config->cdev;
546  struct usb_ep *out_ep = audio->out_ep;
547  struct usb_request *req;
548  int i = 0, err = 0;
549 
550  DBG(cdev, "intf %d, alt %d\n", intf, alt);
551 
552  if (intf == 1) {
553  if (alt == 1) {
554  usb_ep_enable(out_ep);
555  out_ep->driver_data = audio;
556  audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
557  if (IS_ERR(audio->copy_buf))
558  return -ENOMEM;
559 
560  /*
561  * allocate a bunch of read buffers
562  * and queue them all at once.
563  */
564  for (i = 0; i < req_count && err == 0; i++) {
565  req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
566  if (req) {
567  req->buf = kzalloc(req_buf_size,
568  GFP_ATOMIC);
569  if (req->buf) {
570  req->length = req_buf_size;
571  req->context = audio;
572  req->complete =
573  f_audio_complete;
574  err = usb_ep_queue(out_ep,
575  req, GFP_ATOMIC);
576  if (err)
577  ERROR(cdev,
578  "%s queue req: %d\n",
579  out_ep->name, err);
580  } else
581  err = -ENOMEM;
582  } else
583  err = -ENOMEM;
584  }
585 
586  } else {
587  struct f_audio_buf *copy_buf = audio->copy_buf;
588  if (copy_buf) {
589  list_add_tail(&copy_buf->list,
590  &audio->play_queue);
591  schedule_work(&audio->playback_work);
592  }
593  }
594  }
595 
596  return err;
597 }
598 
599 static void f_audio_disable(struct usb_function *f)
600 {
601  return;
602 }
603 
604 /*-------------------------------------------------------------------------*/
605 
606 static void f_audio_build_desc(struct f_audio *audio)
607 {
608  struct gaudio *card = &audio->card;
609  u8 *sam_freq;
610  int rate;
611 
612  /* Set channel numbers */
613  input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
614  as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
615 
616  /* Set sample rates */
617  rate = u_audio_get_playback_rate(card);
618  sam_freq = as_type_i_desc.tSamFreq[0];
619  memcpy(sam_freq, &rate, 3);
620 
621  /* Todo: Set Sample bits and other parameters */
622 
623  return;
624 }
625 
626 /* audio function driver setup/binding */
627 static int __init
628 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
629 {
630  struct usb_composite_dev *cdev = c->cdev;
631  struct f_audio *audio = func_to_audio(f);
632  int status;
633  struct usb_ep *ep;
634 
635  f_audio_build_desc(audio);
636 
637  /* allocate instance-specific interface IDs, and patch descriptors */
638  status = usb_interface_id(c, f);
639  if (status < 0)
640  goto fail;
641  ac_interface_desc.bInterfaceNumber = status;
642 
643  status = usb_interface_id(c, f);
644  if (status < 0)
645  goto fail;
646  as_interface_alt_0_desc.bInterfaceNumber = status;
647  as_interface_alt_1_desc.bInterfaceNumber = status;
648 
649  status = -ENODEV;
650 
651  /* allocate instance-specific endpoints */
652  ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
653  if (!ep)
654  goto fail;
655  audio->out_ep = ep;
656  audio->out_ep->desc = &as_out_ep_desc;
657  ep->driver_data = cdev; /* claim */
658 
659  status = -ENOMEM;
660 
661  /* copy descriptors, and track endpoint copies */
662  f->descriptors = usb_copy_descriptors(f_audio_desc);
663 
664  /*
665  * support all relevant hardware speeds... we expect that when
666  * hardware is dual speed, all bulk-capable endpoints work at
667  * both speeds
668  */
669  if (gadget_is_dualspeed(c->cdev->gadget)) {
670  c->highspeed = true;
671  f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
672  }
673 
674  return 0;
675 
676 fail:
677 
678  return status;
679 }
680 
681 static void
682 f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
683 {
684  struct f_audio *audio = func_to_audio(f);
685 
686  usb_free_descriptors(f->descriptors);
687  usb_free_descriptors(f->hs_descriptors);
688  kfree(audio);
689 }
690 
691 /*-------------------------------------------------------------------------*/
692 
693 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
694 {
695  con->data[cmd] = value;
696 
697  return 0;
698 }
699 
700 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
701 {
702  return con->data[cmd];
703 }
704 
705 /* Todo: add more control selecotor dynamically */
706 int __init control_selector_init(struct f_audio *audio)
707 {
708  INIT_LIST_HEAD(&audio->cs);
709  list_add(&feature_unit.list, &audio->cs);
710 
711  INIT_LIST_HEAD(&feature_unit.control);
712  list_add(&mute_control.list, &feature_unit.control);
713  list_add(&volume_control.list, &feature_unit.control);
714 
715  volume_control.data[UAC__CUR] = 0xffc0;
716  volume_control.data[UAC__MIN] = 0xe3a0;
717  volume_control.data[UAC__MAX] = 0xfff0;
718  volume_control.data[UAC__RES] = 0x0030;
719 
720  return 0;
721 }
722 
730 int __init audio_bind_config(struct usb_configuration *c)
731 {
732  struct f_audio *audio;
733  int status;
734 
735  /* allocate and initialize one new instance */
736  audio = kzalloc(sizeof *audio, GFP_KERNEL);
737  if (!audio)
738  return -ENOMEM;
739 
740  audio->card.func.name = "g_audio";
741  audio->card.gadget = c->cdev->gadget;
742 
743  INIT_LIST_HEAD(&audio->play_queue);
744  spin_lock_init(&audio->lock);
745 
746  /* set up ASLA audio devices */
747  status = gaudio_setup(&audio->card);
748  if (status < 0)
749  goto setup_fail;
750 
751  audio->card.func.strings = audio_strings;
752  audio->card.func.bind = f_audio_bind;
753  audio->card.func.unbind = f_audio_unbind;
754  audio->card.func.set_alt = f_audio_set_alt;
755  audio->card.func.setup = f_audio_setup;
756  audio->card.func.disable = f_audio_disable;
757 
758  control_selector_init(audio);
759 
760  INIT_WORK(&audio->playback_work, f_audio_playback_work);
761 
762  status = usb_add_function(c, &audio->card.func);
763  if (status)
764  goto add_fail;
765 
766  INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
767  audio_buf_size, req_buf_size, req_count);
768 
769  return status;
770 
771 add_fail:
772  gaudio_cleanup();
773 setup_fail:
774  kfree(audio);
775  return status;
776 }
Generated on Thu Jan 10 2013 14:36:11 for Linux Kernel by   doxygen 1.8.2