1
2
3
4
5
6
7
8
9
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
20static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
21module_param(req_buf_size, int, S_IRUGO);
22MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
23
24static int req_count = 256;
25module_param(req_count, int, S_IRUGO);
26MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
27
28static int audio_buf_size = 48000;
29module_param(audio_buf_size, int, S_IRUGO);
30MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
31
32static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
33static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
34
35
36
37
38
39
40
41
42
43
44#define F_AUDIO_AC_INTERFACE 0
45#define F_AUDIO_AS_INTERFACE 1
46#define F_AUDIO_NUM_INTERFACES 2
47
48
49static 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
57DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
58
59#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
60
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
64static 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
78static 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
88DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
89
90#define FEATURE_UNIT_ID 2
91static 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
101static struct usb_audio_control mute_control = {
102 .list = LIST_HEAD_INIT(mute_control.list),
103 .name = "Mute Control",
104 .type = UAC_FU_MUTE,
105
106 .set = generic_set_cmd,
107 .get = generic_get_cmd,
108};
109
110static struct usb_audio_control volume_control = {
111 .list = LIST_HEAD_INIT(volume_control.list),
112 .name = "Volume Control",
113 .type = UAC_FU_VOLUME,
114
115 .set = generic_set_cmd,
116 .get = generic_get_cmd,
117};
118
119static 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
128static 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
139static 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
148static 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
158static 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
167DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
168
169static 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
180static 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
191static 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
200static 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
221
222
223
224struct f_audio_buf {
225 u8 *buf;
226 int actual;
227 struct list_head list;
228};
229
230static 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
247static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
248{
249 kfree(audio_buf->buf);
250 kfree(audio_buf);
251}
252
253
254struct f_audio {
255 struct gaudio card;
256
257
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
266 struct list_head cs;
267 u8 set_cmd;
268 struct usb_audio_control *set_con;
269};
270
271static 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
278static 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
298static 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
309 if (audio_buf_size - copy_buf->actual < req->actual) {
310 list_add_tail(©_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
329static 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:
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
353static 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
389static 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
426static 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
462static 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
490static int
491f_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
501
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
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
539 return value;
540}
541
542static 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
562
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(©_buf->list,
590 &audio->play_queue);
591 schedule_work(&audio->playback_work);
592 }
593 }
594 }
595
596 return err;
597}
598
599static void f_audio_disable(struct usb_function *f)
600{
601 return;
602}
603
604
605
606static 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
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
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
622
623 return;
624}
625
626
627static int __init
628f_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
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
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;
658
659 status = -ENOMEM;
660
661
662 f->descriptors = usb_copy_descriptors(f_audio_desc);
663
664
665
666
667
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
676fail:
677
678 return status;
679}
680
681static void
682f_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
693static 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
700static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
701{
702 return con->data[cmd];
703}
704
705
706int __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
723
724
725
726
727
728
729
730int __init audio_bind_config(struct usb_configuration *c)
731{
732 struct f_audio *audio;
733 int status;
734
735
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
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
771add_fail:
772 gaudio_cleanup();
773setup_fail:
774 kfree(audio);
775 return status;
776}
777
