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Merge branch 'ixp4xx' of git://git.kernel.org/pub/scm/linux/kernel/git/chris/linux-2.6
[linux-2.6-block.git] / drivers / usb / gadget / f_audio.c
CommitLineData
c6994e6f
BW		 1/*
2 * f_audio.c -- USB Audio class function driver
3 *
4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
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/kernel.h>
13#include <linux/device.h>
14#include <asm/atomic.h>
15
16#include "u_audio.h"
17
18#define OUT_EP_MAX_PACKET_SIZE 200
19static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
20module_param(req_buf_size, int, S_IRUGO);
21MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
22
23static int req_count = 256;
24module_param(req_count, int, S_IRUGO);
25MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
26
27static int audio_buf_size = 48000;
28module_param(audio_buf_size, int, S_IRUGO);
29MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
30
b95cd7ec
LP		 31static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
32static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
33
c6994e6f
BW		 34/*
35 * DESCRIPTORS ... most are static, but strings and full
36 * configuration descriptors are built on demand.
37 */
38
39/*
40 * We have two interfaces- AudioControl and AudioStreaming
41 * TODO: only supcard playback currently
42 */
43#define F_AUDIO_AC_INTERFACE 0
44#define F_AUDIO_AS_INTERFACE 1
45#define F_AUDIO_NUM_INTERFACES 2
46
47/* B.3.1 Standard AC Interface Descriptor */
48static struct usb_interface_descriptor ac_interface_desc __initdata = {
49 .bLength = USB_DT_INTERFACE_SIZE,
50 .bDescriptorType = USB_DT_INTERFACE,
51 .bNumEndpoints = 0,
52 .bInterfaceClass = USB_CLASS_AUDIO,
53 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
54};
55
512ad27d 56DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
c6994e6f 57
512ad27d 58#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
c6994e6f 59/* B.3.2 Class-Specific AC Interface Descriptor */
512ad27d
LP		 60static struct uac_ac_header_descriptor_2 ac_header_desc = {
61 .bLength = UAC_DT_AC_HEADER_LENGTH,
c6994e6f 62 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 63 .bDescriptorSubtype = UAC_HEADER,
c6994e6f 64 .bcdADC = __constant_cpu_to_le16(0x0100),
512ad27d 65 .wTotalLength = __constant_cpu_to_le16(UAC_DT_AC_HEADER_LENGTH),
c6994e6f
BW		 66 .bInCollection = F_AUDIO_NUM_INTERFACES,
67 .baInterfaceNr = {
68 [0] = F_AUDIO_AC_INTERFACE,
69 [1] = F_AUDIO_AS_INTERFACE,
70 }
71};
72
73#define INPUT_TERMINAL_ID 1
512ad27d
LP		 74static struct uac_input_terminal_descriptor input_terminal_desc = {
75 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
c6994e6f 76 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 77 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
c6994e6f 78 .bTerminalID = INPUT_TERMINAL_ID,
512ad27d 79 .wTerminalType = UAC_TERMINAL_STREAMING,
c6994e6f
BW		 80 .bAssocTerminal = 0,
81 .wChannelConfig = 0x3,
82};
83
512ad27d 84DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
c6994e6f
BW		 85
86#define FEATURE_UNIT_ID 2
512ad27d
LP		 87static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
88 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
c6994e6f 89 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 90 .bDescriptorSubtype = UAC_FEATURE_UNIT,
c6994e6f
BW		 91 .bUnitID = FEATURE_UNIT_ID,
92 .bSourceID = INPUT_TERMINAL_ID,
93 .bControlSize = 2,
512ad27d 94 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
c6994e6f
BW		 95};
96
97static struct usb_audio_control mute_control = {
98 .list = LIST_HEAD_INIT(mute_control.list),
99 .name = "Mute Control",
512ad27d 100 .type = UAC_MUTE_CONTROL,
c6994e6f
BW		 101 /* Todo: add real Mute control code */
102 .set = generic_set_cmd,
103 .get = generic_get_cmd,
104};
105
106static struct usb_audio_control volume_control = {
107 .list = LIST_HEAD_INIT(volume_control.list),
108 .name = "Volume Control",
512ad27d 109 .type = UAC_VOLUME_CONTROL,
c6994e6f
BW		 110 /* Todo: add real Volume control code */
111 .set = generic_set_cmd,
112 .get = generic_get_cmd,
113};
114
115static struct usb_audio_control_selector feature_unit = {
116 .list = LIST_HEAD_INIT(feature_unit.list),
117 .id = FEATURE_UNIT_ID,
118 .name = "Mute & Volume Control",
512ad27d 119 .type = UAC_FEATURE_UNIT,
c6994e6f
BW		 120 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
121};
122
123#define OUTPUT_TERMINAL_ID 3
512ad27d
LP		 124static struct uac_output_terminal_descriptor output_terminal_desc = {
125 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
c6994e6f 126 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 127 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
c6994e6f 128 .bTerminalID = OUTPUT_TERMINAL_ID,
512ad27d 129 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
c6994e6f
BW		 130 .bAssocTerminal = FEATURE_UNIT_ID,
131 .bSourceID = FEATURE_UNIT_ID,
132};
133
134/* B.4.1 Standard AS Interface Descriptor */
135static struct usb_interface_descriptor as_interface_alt_0_desc = {
136 .bLength = USB_DT_INTERFACE_SIZE,
137 .bDescriptorType = USB_DT_INTERFACE,
138 .bAlternateSetting = 0,
139 .bNumEndpoints = 0,
140 .bInterfaceClass = USB_CLASS_AUDIO,
141 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
142};
143
144static struct usb_interface_descriptor as_interface_alt_1_desc = {
145 .bLength = USB_DT_INTERFACE_SIZE,
146 .bDescriptorType = USB_DT_INTERFACE,
147 .bAlternateSetting = 1,
148 .bNumEndpoints = 1,
149 .bInterfaceClass = USB_CLASS_AUDIO,
150 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
151};
152
153/* B.4.2 Class-Specific AS Interface Descriptor */
512ad27d
LP		 154static struct uac_as_header_descriptor as_header_desc = {
155 .bLength = UAC_DT_AS_HEADER_SIZE,
c6994e6f 156 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 157 .bDescriptorSubtype = UAC_AS_GENERAL,
c6994e6f
BW		 158 .bTerminalLink = INPUT_TERMINAL_ID,
159 .bDelay = 1,
512ad27d 160 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
c6994e6f
BW		 161};
162
512ad27d 163DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
c6994e6f 164
512ad27d
LP		 165static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
166 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
c6994e6f 167 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d
LP		 168 .bDescriptorSubtype = UAC_FORMAT_TYPE,
169 .bFormatType = UAC_FORMAT_TYPE_I,
c6994e6f
BW		 170 .bSubframeSize = 2,
171 .bBitResolution = 16,
172 .bSamFreqType = 1,
173};
174
175/* Standard ISO OUT Endpoint Descriptor */
176static struct usb_endpoint_descriptor as_out_ep_desc __initdata = {
177 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
178 .bDescriptorType = USB_DT_ENDPOINT,
179 .bEndpointAddress = USB_DIR_OUT,
85e08ca5 180 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
c6994e6f
BW		 181 | USB_ENDPOINT_XFER_ISOC,
182 .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
183 .bInterval = 4,
184};
185
186/* Class-specific AS ISO OUT Endpoint Descriptor */
512ad27d
LP		 187static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
188 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
c6994e6f 189 .bDescriptorType = USB_DT_CS_ENDPOINT,
512ad27d 190 .bDescriptorSubtype = UAC_EP_GENERAL,
c6994e6f
BW		 191 .bmAttributes = 1,
192 .bLockDelayUnits = 1,
193 .wLockDelay = __constant_cpu_to_le16(1),
194};
195
196static struct usb_descriptor_header *f_audio_desc[] __initdata = {
197 (struct usb_descriptor_header *)&ac_interface_desc,
198 (struct usb_descriptor_header *)&ac_header_desc,
199
200 (struct usb_descriptor_header *)&input_terminal_desc,
201 (struct usb_descriptor_header *)&output_terminal_desc,
202 (struct usb_descriptor_header *)&feature_unit_desc,
203
204 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
205 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
206 (struct usb_descriptor_header *)&as_header_desc,
207
208 (struct usb_descriptor_header *)&as_type_i_desc,
209
210 (struct usb_descriptor_header *)&as_out_ep_desc,
211 (struct usb_descriptor_header *)&as_iso_out_desc,
212 NULL,
213};
214
215/* string IDs are assigned dynamically */
216
217#define STRING_MANUFACTURER_IDX 0
218#define STRING_PRODUCT_IDX 1
219
220static char manufacturer[50];
221
222static struct usb_string strings_dev[] = {
223 [STRING_MANUFACTURER_IDX].s = manufacturer,
224 [STRING_PRODUCT_IDX].s = DRIVER_DESC,
225 { } /* end of list */
226};
227
228static struct usb_gadget_strings stringtab_dev = {
229 .language = 0x0409, /* en-us */
230 .strings = strings_dev,
231};
232
233static struct usb_gadget_strings *audio_strings[] = {
234 &stringtab_dev,
235 NULL,
236};
237
238/*
239 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
240 */
241
242/*-------------------------------------------------------------------------*/
243struct f_audio_buf {
244 u8 *buf;
245 int actual;
246 struct list_head list;
247};
248
249static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
250{
251 struct f_audio_buf *copy_buf;
252
253 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
254 if (!copy_buf)
255 return (struct f_audio_buf *)-ENOMEM;
256
257 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
258 if (!copy_buf->buf) {
259 kfree(copy_buf);
260 return (struct f_audio_buf *)-ENOMEM;
261 }
262
263 return copy_buf;
264}
265
266static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
267{
268 kfree(audio_buf->buf);
269 kfree(audio_buf);
270}
271/*-------------------------------------------------------------------------*/
272
273struct f_audio {
274 struct gaudio card;
275
276 /* endpoints handle full and/or high speeds */
277 struct usb_ep *out_ep;
278 struct usb_endpoint_descriptor *out_desc;
279
280 spinlock_t lock;
281 struct f_audio_buf *copy_buf;
282 struct work_struct playback_work;
283 struct list_head play_queue;
284
285 /* Control Set command */
286 struct list_head cs;
287 u8 set_cmd;
288 struct usb_audio_control *set_con;
289};
290
291static inline struct f_audio *func_to_audio(struct usb_function *f)
292{
293 return container_of(f, struct f_audio, card.func);
294}
295
296/*-------------------------------------------------------------------------*/
297
298static void f_audio_playback_work(struct work_struct *data)
299{
300 struct f_audio *audio = container_of(data, struct f_audio,
301 playback_work);
302 struct f_audio_buf *play_buf;
303
304 spin_lock_irq(&audio->lock);
305 if (list_empty(&audio->play_queue)) {
306 spin_unlock_irq(&audio->lock);
307 return;
308 }
309 play_buf = list_first_entry(&audio->play_queue,
310 struct f_audio_buf, list);
311 list_del(&play_buf->list);
312 spin_unlock_irq(&audio->lock);
313
314 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
315 f_audio_buffer_free(play_buf);
316
317 return;
318}
319
320static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
321{
322 struct f_audio *audio = req->context;
323 struct usb_composite_dev *cdev = audio->card.func.config->cdev;
324 struct f_audio_buf *copy_buf = audio->copy_buf;
325 int err;
326
327 if (!copy_buf)
328 return -EINVAL;
329
330 /* Copy buffer is full, add it to the play_queue */
331 if (audio_buf_size - copy_buf->actual < req->actual) {
332 list_add_tail(&copy_buf->list, &audio->play_queue);
333 schedule_work(&audio->playback_work);
334 copy_buf = f_audio_buffer_alloc(audio_buf_size);
335 if (copy_buf < 0)
336 return -ENOMEM;
337 }
338
339 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
340 copy_buf->actual += req->actual;
341 audio->copy_buf = copy_buf;
342
343 err = usb_ep_queue(ep, req, GFP_ATOMIC);
344 if (err)
345 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
346
347 return 0;
348
349}
350
351static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
352{
353 struct f_audio *audio = req->context;
354 int status = req->status;
355 u32 data = 0;
356 struct usb_ep *out_ep = audio->out_ep;
357
358 switch (status) {
359
360 case 0: /* normal completion? */
361 if (ep == out_ep)
362 f_audio_out_ep_complete(ep, req);
363 else if (audio->set_con) {
364 memcpy(&data, req->buf, req->length);
365 audio->set_con->set(audio->set_con, audio->set_cmd,
366 le16_to_cpu(data));
367 audio->set_con = NULL;
368 }
369 break;
370 default:
371 break;
372 }
373}
374
375static int audio_set_intf_req(struct usb_function *f,
376 const struct usb_ctrlrequest *ctrl)
377{
378 struct f_audio *audio = func_to_audio(f);
379 struct usb_composite_dev *cdev = f->config->cdev;
380 struct usb_request *req = cdev->req;
381 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
382 u16 len = le16_to_cpu(ctrl->wLength);
383 u16 w_value = le16_to_cpu(ctrl->wValue);
384 u8 con_sel = (w_value >> 8) & 0xFF;
385 u8 cmd = (ctrl->bRequest & 0x0F);
386 struct usb_audio_control_selector *cs;
387 struct usb_audio_control *con;
388
389 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
390 ctrl->bRequest, w_value, len, id);
391
392 list_for_each_entry(cs, &audio->cs, list) {
393 if (cs->id == id) {
394 list_for_each_entry(con, &cs->control, list) {
395 if (con->type == con_sel) {
396 audio->set_con = con;
397 break;
398 }
399 }
400 break;
401 }
402 }
403
404 audio->set_cmd = cmd;
405 req->context = audio;
406 req->complete = f_audio_complete;
407
408 return len;
409}
410
411static int audio_get_intf_req(struct usb_function *f,
412 const struct usb_ctrlrequest *ctrl)
413{
414 struct f_audio *audio = func_to_audio(f);
415 struct usb_composite_dev *cdev = f->config->cdev;
416 struct usb_request *req = cdev->req;
417 int value = -EOPNOTSUPP;
418 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
419 u16 len = le16_to_cpu(ctrl->wLength);
420 u16 w_value = le16_to_cpu(ctrl->wValue);
421 u8 con_sel = (w_value >> 8) & 0xFF;
422 u8 cmd = (ctrl->bRequest & 0x0F);
423 struct usb_audio_control_selector *cs;
424 struct usb_audio_control *con;
425
426 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
427 ctrl->bRequest, w_value, len, id);
428
429 list_for_each_entry(cs, &audio->cs, list) {
430 if (cs->id == id) {
431 list_for_each_entry(con, &cs->control, list) {
432 if (con->type == con_sel && con->get) {
433 value = con->get(con, cmd);
434 break;
435 }
436 }
437 break;
438 }
439 }
440
441 req->context = audio;
442 req->complete = f_audio_complete;
443 memcpy(req->buf, &value, len);
444
445 return len;
446}
447
448static int
449f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
450{
451 struct usb_composite_dev *cdev = f->config->cdev;
452 struct usb_request *req = cdev->req;
453 int value = -EOPNOTSUPP;
454 u16 w_index = le16_to_cpu(ctrl->wIndex);
455 u16 w_value = le16_to_cpu(ctrl->wValue);
456 u16 w_length = le16_to_cpu(ctrl->wLength);
457
458 /* composite driver infrastructure handles everything except
459 * Audio class messages; interface activation uses set_alt().
460 */
461 switch (ctrl->bRequestType) {
512ad27d 462 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 463 value = audio_set_intf_req(f, ctrl);
464 break;
465
512ad27d 466 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 467 value = audio_get_intf_req(f, ctrl);
468 break;
469
470 default:
471 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
472 ctrl->bRequestType, ctrl->bRequest,
473 w_value, w_index, w_length);
474 }
475
476 /* respond with data transfer or status phase? */
477 if (value >= 0) {
478 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
479 ctrl->bRequestType, ctrl->bRequest,
480 w_value, w_index, w_length);
481 req->zero = 0;
482 req->length = value;
483 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
484 if (value < 0)
485 ERROR(cdev, "audio response on err %d\n", value);
486 }
487
488 /* device either stalls (value < 0) or reports success */
489 return value;
490}
491
492static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
493{
494 struct f_audio *audio = func_to_audio(f);
495 struct usb_composite_dev *cdev = f->config->cdev;
496 struct usb_ep *out_ep = audio->out_ep;
497 struct usb_request *req;
498 int i = 0, err = 0;
499
500 DBG(cdev, "intf %d, alt %d\n", intf, alt);
501
502 if (intf == 1) {
503 if (alt == 1) {
504 usb_ep_enable(out_ep, audio->out_desc);
505 out_ep->driver_data = audio;
506 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
507
508 /*
509 * allocate a bunch of read buffers
510 * and queue them all at once.
511 */
512 for (i = 0; i < req_count && err == 0; i++) {
513 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
514 if (req) {
515 req->buf = kzalloc(req_buf_size,
516 GFP_ATOMIC);
517 if (req->buf) {
518 req->length = req_buf_size;
519 req->context = audio;
520 req->complete =
521 f_audio_complete;
522 err = usb_ep_queue(out_ep,
523 req, GFP_ATOMIC);
524 if (err)
525 ERROR(cdev,
526 "%s queue req: %d\n",
527 out_ep->name, err);
528 } else
529 err = -ENOMEM;
530 } else
531 err = -ENOMEM;
532 }
533
534 } else {
535 struct f_audio_buf *copy_buf = audio->copy_buf;
536 if (copy_buf) {
537 list_add_tail(&copy_buf->list,
538 &audio->play_queue);
539 schedule_work(&audio->playback_work);
540 }
541 }
542 }
543
544 return err;
545}
546
547static void f_audio_disable(struct usb_function *f)
548{
549 return;
550}
551
552/*-------------------------------------------------------------------------*/
553
554static void f_audio_build_desc(struct f_audio *audio)
555{
556 struct gaudio *card = &audio->card;
557 u8 *sam_freq;
558 int rate;
559
560 /* Set channel numbers */
561 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
562 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
563
564 /* Set sample rates */
565 rate = u_audio_get_playback_rate(card);
566 sam_freq = as_type_i_desc.tSamFreq[0];
567 memcpy(sam_freq, &rate, 3);
568
569 /* Todo: Set Sample bits and other parameters */
570
571 return;
572}
573
574/* audio function driver setup/binding */
575static int __init
576f_audio_bind(struct usb_configuration *c, struct usb_function *f)
577{
578 struct usb_composite_dev *cdev = c->cdev;
579 struct f_audio *audio = func_to_audio(f);
580 int status;
581 struct usb_ep *ep;
582
583 f_audio_build_desc(audio);
584
585 /* allocate instance-specific interface IDs, and patch descriptors */
586 status = usb_interface_id(c, f);
587 if (status < 0)
588 goto fail;
589 ac_interface_desc.bInterfaceNumber = status;
590
591 status = usb_interface_id(c, f);
592 if (status < 0)
593 goto fail;
594 as_interface_alt_0_desc.bInterfaceNumber = status;
595 as_interface_alt_1_desc.bInterfaceNumber = status;
596
597 status = -ENODEV;
598
599 /* allocate instance-specific endpoints */
600 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
601 if (!ep)
602 goto fail;
603 audio->out_ep = ep;
604 ep->driver_data = cdev; /* claim */
605
606 status = -ENOMEM;
607
608 /* supcard all relevant hardware speeds... we expect that when
609 * hardware is dual speed, all bulk-capable endpoints work at
610 * both speeds
611 */
612
613 /* copy descriptors, and track endpoint copies */
614 if (gadget_is_dualspeed(c->cdev->gadget)) {
615 c->highspeed = true;
616 f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
617 } else
618 f->descriptors = usb_copy_descriptors(f_audio_desc);
619
620 return 0;
621
622fail:
623
624 return status;
625}
626
627static void
628f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
629{
630 struct f_audio *audio = func_to_audio(f);
631
632 usb_free_descriptors(f->descriptors);
633 kfree(audio);
634}
635
636/*-------------------------------------------------------------------------*/
637
b95cd7ec
LP		 638static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
639{
640 con->data[cmd] = value;
641
642 return 0;
643}
644
645static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
646{
647 return con->data[cmd];
648}
649
c6994e6f
BW		 650/* Todo: add more control selecotor dynamically */
651int __init control_selector_init(struct f_audio *audio)
652{
653 INIT_LIST_HEAD(&audio->cs);
654 list_add(&feature_unit.list, &audio->cs);
655
656 INIT_LIST_HEAD(&feature_unit.control);
657 list_add(&mute_control.list, &feature_unit.control);
658 list_add(&volume_control.list, &feature_unit.control);
659
512ad27d
LP		 660 volume_control.data[UAC__CUR] = 0xffc0;
661 volume_control.data[UAC__MIN] = 0xe3a0;
662 volume_control.data[UAC__MAX] = 0xfff0;
663 volume_control.data[UAC__RES] = 0x0030;
c6994e6f
BW		 664
665 return 0;
666}
667
668/**
669 * audio_bind_config - add USB audio fucntion to a configuration
670 * @c: the configuration to supcard the USB audio function
671 * Context: single threaded during gadget setup
672 *
673 * Returns zero on success, else negative errno.
674 */
675int __init audio_bind_config(struct usb_configuration *c)
676{
677 struct f_audio *audio;
678 int status;
679
680 /* allocate and initialize one new instance */
681 audio = kzalloc(sizeof *audio, GFP_KERNEL);
682 if (!audio)
683 return -ENOMEM;
684
685 audio->card.func.name = "g_audio";
686 audio->card.gadget = c->cdev->gadget;
687
688 INIT_LIST_HEAD(&audio->play_queue);
689 spin_lock_init(&audio->lock);
690
691 /* set up ASLA audio devices */
692 status = gaudio_setup(&audio->card);
693 if (status < 0)
694 goto setup_fail;
695
696 audio->card.func.strings = audio_strings;
697 audio->card.func.bind = f_audio_bind;
698 audio->card.func.unbind = f_audio_unbind;
699 audio->card.func.set_alt = f_audio_set_alt;
700 audio->card.func.setup = f_audio_setup;
701 audio->card.func.disable = f_audio_disable;
702 audio->out_desc = &as_out_ep_desc;
703
704 control_selector_init(audio);
705
706 INIT_WORK(&audio->playback_work, f_audio_playback_work);
707
708 status = usb_add_function(c, &audio->card.func);
709 if (status)
710 goto add_fail;
711
712 INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
713 audio_buf_size, req_buf_size, req_count);
714
715 return status;
716
717add_fail:
718 gaudio_cleanup(&audio->card);
719setup_fail:
720 kfree(audio);
721 return status;
722}
Linux 6.x block layer and io_uring tree(s)