projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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)
d16f1726
CC		 59/* 1 input terminal, 1 output terminal and 1 feature unit */
60#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
61 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
c6994e6f 62/* B.3.2 Class-Specific AC Interface Descriptor */
512ad27d
LP		 63static struct uac_ac_header_descriptor_2 ac_header_desc = {
64 .bLength = UAC_DT_AC_HEADER_LENGTH,
c6994e6f 65 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 66 .bDescriptorSubtype = UAC_HEADER,
c6994e6f 67 .bcdADC = __constant_cpu_to_le16(0x0100),
d16f1726 68 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
c6994e6f
BW		 69 .bInCollection = F_AUDIO_NUM_INTERFACES,
70 .baInterfaceNr = {
71 [0] = F_AUDIO_AC_INTERFACE,
72 [1] = F_AUDIO_AS_INTERFACE,
73 }
74};
75
76#define INPUT_TERMINAL_ID 1
512ad27d
LP		 77static struct uac_input_terminal_descriptor input_terminal_desc = {
78 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
c6994e6f 79 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 80 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
c6994e6f 81 .bTerminalID = INPUT_TERMINAL_ID,
512ad27d 82 .wTerminalType = UAC_TERMINAL_STREAMING,
c6994e6f
BW		 83 .bAssocTerminal = 0,
84 .wChannelConfig = 0x3,
85};
86
512ad27d 87DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
c6994e6f
BW		 88
89#define FEATURE_UNIT_ID 2
512ad27d
LP		 90static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
91 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
c6994e6f 92 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 93 .bDescriptorSubtype = UAC_FEATURE_UNIT,
c6994e6f
BW		 94 .bUnitID = FEATURE_UNIT_ID,
95 .bSourceID = INPUT_TERMINAL_ID,
96 .bControlSize = 2,
512ad27d 97 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
c6994e6f
BW		 98};
99
100static struct usb_audio_control mute_control = {
101 .list = LIST_HEAD_INIT(mute_control.list),
102 .name = "Mute Control",
512ad27d 103 .type = UAC_MUTE_CONTROL,
c6994e6f
BW		 104 /* Todo: add real Mute control code */
105 .set = generic_set_cmd,
106 .get = generic_get_cmd,
107};
108
109static struct usb_audio_control volume_control = {
110 .list = LIST_HEAD_INIT(volume_control.list),
111 .name = "Volume Control",
512ad27d 112 .type = UAC_VOLUME_CONTROL,
c6994e6f
BW		 113 /* Todo: add real Volume control code */
114 .set = generic_set_cmd,
115 .get = generic_get_cmd,
116};
117
118static struct usb_audio_control_selector feature_unit = {
119 .list = LIST_HEAD_INIT(feature_unit.list),
120 .id = FEATURE_UNIT_ID,
121 .name = "Mute & Volume Control",
512ad27d 122 .type = UAC_FEATURE_UNIT,
c6994e6f
BW		 123 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
124};
125
126#define OUTPUT_TERMINAL_ID 3
512ad27d
LP		 127static struct uac_output_terminal_descriptor output_terminal_desc = {
128 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
c6994e6f 129 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 130 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
c6994e6f 131 .bTerminalID = OUTPUT_TERMINAL_ID,
512ad27d 132 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
c6994e6f
BW		 133 .bAssocTerminal = FEATURE_UNIT_ID,
134 .bSourceID = FEATURE_UNIT_ID,
135};
136
137/* B.4.1 Standard AS Interface Descriptor */
138static struct usb_interface_descriptor as_interface_alt_0_desc = {
139 .bLength = USB_DT_INTERFACE_SIZE,
140 .bDescriptorType = USB_DT_INTERFACE,
141 .bAlternateSetting = 0,
142 .bNumEndpoints = 0,
143 .bInterfaceClass = USB_CLASS_AUDIO,
144 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
145};
146
147static struct usb_interface_descriptor as_interface_alt_1_desc = {
148 .bLength = USB_DT_INTERFACE_SIZE,
149 .bDescriptorType = USB_DT_INTERFACE,
150 .bAlternateSetting = 1,
151 .bNumEndpoints = 1,
152 .bInterfaceClass = USB_CLASS_AUDIO,
153 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
154};
155
156/* B.4.2 Class-Specific AS Interface Descriptor */
512ad27d
LP		 157static struct uac_as_header_descriptor as_header_desc = {
158 .bLength = UAC_DT_AS_HEADER_SIZE,
c6994e6f 159 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 160 .bDescriptorSubtype = UAC_AS_GENERAL,
c6994e6f
BW		 161 .bTerminalLink = INPUT_TERMINAL_ID,
162 .bDelay = 1,
512ad27d 163 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
c6994e6f
BW		 164};
165
512ad27d 166DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
c6994e6f 167
512ad27d
LP		 168static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
169 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
c6994e6f 170 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d
LP		 171 .bDescriptorSubtype = UAC_FORMAT_TYPE,
172 .bFormatType = UAC_FORMAT_TYPE_I,
c6994e6f
BW		 173 .bSubframeSize = 2,
174 .bBitResolution = 16,
175 .bSamFreqType = 1,
176};
177
178/* Standard ISO OUT Endpoint Descriptor */
179static struct usb_endpoint_descriptor as_out_ep_desc __initdata = {
180 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
181 .bDescriptorType = USB_DT_ENDPOINT,
182 .bEndpointAddress = USB_DIR_OUT,
85e08ca5 183 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
c6994e6f
BW		 184 | USB_ENDPOINT_XFER_ISOC,
185 .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
186 .bInterval = 4,
187};
188
189/* Class-specific AS ISO OUT Endpoint Descriptor */
512ad27d
LP		 190static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
191 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
c6994e6f 192 .bDescriptorType = USB_DT_CS_ENDPOINT,
512ad27d 193 .bDescriptorSubtype = UAC_EP_GENERAL,
c6994e6f
BW		 194 .bmAttributes = 1,
195 .bLockDelayUnits = 1,
196 .wLockDelay = __constant_cpu_to_le16(1),
197};
198
199static struct usb_descriptor_header *f_audio_desc[] __initdata = {
200 (struct usb_descriptor_header *)&ac_interface_desc,
201 (struct usb_descriptor_header *)&ac_header_desc,
202
203 (struct usb_descriptor_header *)&input_terminal_desc,
204 (struct usb_descriptor_header *)&output_terminal_desc,
205 (struct usb_descriptor_header *)&feature_unit_desc,
206
207 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
208 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
209 (struct usb_descriptor_header *)&as_header_desc,
210
211 (struct usb_descriptor_header *)&as_type_i_desc,
212
213 (struct usb_descriptor_header *)&as_out_ep_desc,
214 (struct usb_descriptor_header *)&as_iso_out_desc,
215 NULL,
216};
217
218/* string IDs are assigned dynamically */
219
220#define STRING_MANUFACTURER_IDX 0
221#define STRING_PRODUCT_IDX 1
222
223static char manufacturer[50];
224
225static struct usb_string strings_dev[] = {
226 [STRING_MANUFACTURER_IDX].s = manufacturer,
227 [STRING_PRODUCT_IDX].s = DRIVER_DESC,
228 { } /* end of list */
229};
230
231static struct usb_gadget_strings stringtab_dev = {
232 .language = 0x0409, /* en-us */
233 .strings = strings_dev,
234};
235
236static struct usb_gadget_strings *audio_strings[] = {
237 &stringtab_dev,
238 NULL,
239};
240
241/*
242 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
243 */
244
245/*-------------------------------------------------------------------------*/
246struct f_audio_buf {
247 u8 *buf;
248 int actual;
249 struct list_head list;
250};
251
252static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
253{
254 struct f_audio_buf *copy_buf;
255
256 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
257 if (!copy_buf)
ff3b968c 258 return ERR_PTR(-ENOMEM);
c6994e6f
BW		 259
260 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
261 if (!copy_buf->buf) {
262 kfree(copy_buf);
ff3b968c 263 return ERR_PTR(-ENOMEM);
c6994e6f
BW		 264 }
265
266 return copy_buf;
267}
268
269static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
270{
271 kfree(audio_buf->buf);
272 kfree(audio_buf);
273}
274/*-------------------------------------------------------------------------*/
275
276struct f_audio {
277 struct gaudio card;
278
279 /* endpoints handle full and/or high speeds */
280 struct usb_ep *out_ep;
281 struct usb_endpoint_descriptor *out_desc;
282
283 spinlock_t lock;
284 struct f_audio_buf *copy_buf;
285 struct work_struct playback_work;
286 struct list_head play_queue;
287
288 /* Control Set command */
289 struct list_head cs;
290 u8 set_cmd;
291 struct usb_audio_control *set_con;
292};
293
294static inline struct f_audio *func_to_audio(struct usb_function *f)
295{
296 return container_of(f, struct f_audio, card.func);
297}
298
299/*-------------------------------------------------------------------------*/
300
301static void f_audio_playback_work(struct work_struct *data)
302{
303 struct f_audio *audio = container_of(data, struct f_audio,
304 playback_work);
305 struct f_audio_buf *play_buf;
306
307 spin_lock_irq(&audio->lock);
308 if (list_empty(&audio->play_queue)) {
309 spin_unlock_irq(&audio->lock);
310 return;
311 }
312 play_buf = list_first_entry(&audio->play_queue,
313 struct f_audio_buf, list);
314 list_del(&play_buf->list);
315 spin_unlock_irq(&audio->lock);
316
317 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
318 f_audio_buffer_free(play_buf);
319
320 return;
321}
322
323static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
324{
325 struct f_audio *audio = req->context;
326 struct usb_composite_dev *cdev = audio->card.func.config->cdev;
327 struct f_audio_buf *copy_buf = audio->copy_buf;
328 int err;
329
330 if (!copy_buf)
331 return -EINVAL;
332
333 /* Copy buffer is full, add it to the play_queue */
334 if (audio_buf_size - copy_buf->actual < req->actual) {
335 list_add_tail(&copy_buf->list, &audio->play_queue);
336 schedule_work(&audio->playback_work);
337 copy_buf = f_audio_buffer_alloc(audio_buf_size);
ff3b968c 338 if (IS_ERR(copy_buf))
c6994e6f
BW		 339 return -ENOMEM;
340 }
341
342 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
343 copy_buf->actual += req->actual;
344 audio->copy_buf = copy_buf;
345
346 err = usb_ep_queue(ep, req, GFP_ATOMIC);
347 if (err)
348 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
349
350 return 0;
351
352}
353
354static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
355{
356 struct f_audio *audio = req->context;
357 int status = req->status;
358 u32 data = 0;
359 struct usb_ep *out_ep = audio->out_ep;
360
361 switch (status) {
362
363 case 0: /* normal completion? */
364 if (ep == out_ep)
365 f_audio_out_ep_complete(ep, req);
366 else if (audio->set_con) {
367 memcpy(&data, req->buf, req->length);
368 audio->set_con->set(audio->set_con, audio->set_cmd,
369 le16_to_cpu(data));
370 audio->set_con = NULL;
371 }
372 break;
373 default:
374 break;
375 }
376}
377
378static int audio_set_intf_req(struct usb_function *f,
379 const struct usb_ctrlrequest *ctrl)
380{
381 struct f_audio *audio = func_to_audio(f);
382 struct usb_composite_dev *cdev = f->config->cdev;
383 struct usb_request *req = cdev->req;
384 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
385 u16 len = le16_to_cpu(ctrl->wLength);
386 u16 w_value = le16_to_cpu(ctrl->wValue);
387 u8 con_sel = (w_value >> 8) & 0xFF;
388 u8 cmd = (ctrl->bRequest & 0x0F);
389 struct usb_audio_control_selector *cs;
390 struct usb_audio_control *con;
391
392 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
393 ctrl->bRequest, w_value, len, id);
394
395 list_for_each_entry(cs, &audio->cs, list) {
396 if (cs->id == id) {
397 list_for_each_entry(con, &cs->control, list) {
398 if (con->type == con_sel) {
399 audio->set_con = con;
400 break;
401 }
402 }
403 break;
404 }
405 }
406
407 audio->set_cmd = cmd;
408 req->context = audio;
409 req->complete = f_audio_complete;
410
411 return len;
412}
413
414static int audio_get_intf_req(struct usb_function *f,
415 const struct usb_ctrlrequest *ctrl)
416{
417 struct f_audio *audio = func_to_audio(f);
418 struct usb_composite_dev *cdev = f->config->cdev;
419 struct usb_request *req = cdev->req;
420 int value = -EOPNOTSUPP;
421 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
422 u16 len = le16_to_cpu(ctrl->wLength);
423 u16 w_value = le16_to_cpu(ctrl->wValue);
424 u8 con_sel = (w_value >> 8) & 0xFF;
425 u8 cmd = (ctrl->bRequest & 0x0F);
426 struct usb_audio_control_selector *cs;
427 struct usb_audio_control *con;
428
429 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
430 ctrl->bRequest, w_value, len, id);
431
432 list_for_each_entry(cs, &audio->cs, list) {
433 if (cs->id == id) {
434 list_for_each_entry(con, &cs->control, list) {
435 if (con->type == con_sel && con->get) {
436 value = con->get(con, cmd);
437 break;
438 }
439 }
440 break;
441 }
442 }
443
444 req->context = audio;
445 req->complete = f_audio_complete;
446 memcpy(req->buf, &value, len);
447
448 return len;
449}
450
0ad72524
LP		 451static int audio_set_endpoint_req(struct usb_function *f,
452 const struct usb_ctrlrequest *ctrl)
453{
454 struct usb_composite_dev *cdev = f->config->cdev;
455 int value = -EOPNOTSUPP;
456 u16 ep = le16_to_cpu(ctrl->wIndex);
457 u16 len = le16_to_cpu(ctrl->wLength);
458 u16 w_value = le16_to_cpu(ctrl->wValue);
459
460 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
461 ctrl->bRequest, w_value, len, ep);
462
463 switch (ctrl->bRequest) {
464 case UAC_SET_CUR:
465 value = 0;
466 break;
467
468 case UAC_SET_MIN:
469 break;
470
471 case UAC_SET_MAX:
472 break;
473
474 case UAC_SET_RES:
475 break;
476
477 case UAC_SET_MEM:
478 break;
479
480 default:
481 break;
482 }
483
484 return value;
485}
486
487static int audio_get_endpoint_req(struct usb_function *f,
488 const struct usb_ctrlrequest *ctrl)
489{
490 struct usb_composite_dev *cdev = f->config->cdev;
491 int value = -EOPNOTSUPP;
492 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
493 u16 len = le16_to_cpu(ctrl->wLength);
494 u16 w_value = le16_to_cpu(ctrl->wValue);
495
496 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
497 ctrl->bRequest, w_value, len, ep);
498
499 switch (ctrl->bRequest) {
500 case UAC_GET_CUR:
501 case UAC_GET_MIN:
502 case UAC_GET_MAX:
503 case UAC_GET_RES:
504 value = 3;
505 break;
506 case UAC_GET_MEM:
507 break;
508 default:
509 break;
510 }
511
512 return value;
513}
514
c6994e6f
BW		 515static int
516f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
517{
518 struct usb_composite_dev *cdev = f->config->cdev;
519 struct usb_request *req = cdev->req;
520 int value = -EOPNOTSUPP;
521 u16 w_index = le16_to_cpu(ctrl->wIndex);
522 u16 w_value = le16_to_cpu(ctrl->wValue);
523 u16 w_length = le16_to_cpu(ctrl->wLength);
524
0ad72524
LP		 525 /* composite driver infrastructure handles everything; interface
526 * activation uses set_alt().
c6994e6f
BW		 527 */
528 switch (ctrl->bRequestType) {
512ad27d 529 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 530 value = audio_set_intf_req(f, ctrl);
531 break;
532
512ad27d 533 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 534 value = audio_get_intf_req(f, ctrl);
535 break;
536
0ad72524
LP		 537 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
538 value = audio_set_endpoint_req(f, ctrl);
539 break;
540
541 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
542 value = audio_get_endpoint_req(f, ctrl);
543 break;
544
c6994e6f
BW		 545 default:
546 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
547 ctrl->bRequestType, ctrl->bRequest,
548 w_value, w_index, w_length);
549 }
550
551 /* respond with data transfer or status phase? */
552 if (value >= 0) {
553 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
554 ctrl->bRequestType, ctrl->bRequest,
555 w_value, w_index, w_length);
556 req->zero = 0;
557 req->length = value;
558 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
559 if (value < 0)
560 ERROR(cdev, "audio response on err %d\n", value);
561 }
562
563 /* device either stalls (value < 0) or reports success */
564 return value;
565}
566
567static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
568{
569 struct f_audio *audio = func_to_audio(f);
570 struct usb_composite_dev *cdev = f->config->cdev;
571 struct usb_ep *out_ep = audio->out_ep;
572 struct usb_request *req;
573 int i = 0, err = 0;
574
575 DBG(cdev, "intf %d, alt %d\n", intf, alt);
576
577 if (intf == 1) {
578 if (alt == 1) {
579 usb_ep_enable(out_ep, audio->out_desc);
580 out_ep->driver_data = audio;
581 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
ff3b968c
JL		 582 if (IS_ERR(audio->copy_buf))
583 return -ENOMEM;
c6994e6f
BW		 584
585 /*
586 * allocate a bunch of read buffers
587 * and queue them all at once.
588 */
589 for (i = 0; i < req_count && err == 0; i++) {
590 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
591 if (req) {
592 req->buf = kzalloc(req_buf_size,
593 GFP_ATOMIC);
594 if (req->buf) {
595 req->length = req_buf_size;
596 req->context = audio;
597 req->complete =
598 f_audio_complete;
599 err = usb_ep_queue(out_ep,
600 req, GFP_ATOMIC);
601 if (err)
602 ERROR(cdev,
603 "%s queue req: %d\n",
604 out_ep->name, err);
605 } else
606 err = -ENOMEM;
607 } else
608 err = -ENOMEM;
609 }
610
611 } else {
612 struct f_audio_buf *copy_buf = audio->copy_buf;
613 if (copy_buf) {
614 list_add_tail(&copy_buf->list,
615 &audio->play_queue);
616 schedule_work(&audio->playback_work);
617 }
618 }
619 }
620
621 return err;
622}
623
624static void f_audio_disable(struct usb_function *f)
625{
626 return;
627}
628
629/*-------------------------------------------------------------------------*/
630
631static void f_audio_build_desc(struct f_audio *audio)
632{
633 struct gaudio *card = &audio->card;
634 u8 *sam_freq;
635 int rate;
636
637 /* Set channel numbers */
638 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
639 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
640
641 /* Set sample rates */
642 rate = u_audio_get_playback_rate(card);
643 sam_freq = as_type_i_desc.tSamFreq[0];
644 memcpy(sam_freq, &rate, 3);
645
646 /* Todo: Set Sample bits and other parameters */
647
648 return;
649}
650
651/* audio function driver setup/binding */
652static int __init
653f_audio_bind(struct usb_configuration *c, struct usb_function *f)
654{
655 struct usb_composite_dev *cdev = c->cdev;
656 struct f_audio *audio = func_to_audio(f);
657 int status;
658 struct usb_ep *ep;
659
660 f_audio_build_desc(audio);
661
662 /* allocate instance-specific interface IDs, and patch descriptors */
663 status = usb_interface_id(c, f);
664 if (status < 0)
665 goto fail;
666 ac_interface_desc.bInterfaceNumber = status;
667
668 status = usb_interface_id(c, f);
669 if (status < 0)
670 goto fail;
671 as_interface_alt_0_desc.bInterfaceNumber = status;
672 as_interface_alt_1_desc.bInterfaceNumber = status;
673
674 status = -ENODEV;
675
676 /* allocate instance-specific endpoints */
677 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
678 if (!ep)
679 goto fail;
680 audio->out_ep = ep;
681 ep->driver_data = cdev; /* claim */
682
683 status = -ENOMEM;
684
685 /* supcard all relevant hardware speeds... we expect that when
686 * hardware is dual speed, all bulk-capable endpoints work at
687 * both speeds
688 */
689
690 /* copy descriptors, and track endpoint copies */
691 if (gadget_is_dualspeed(c->cdev->gadget)) {
692 c->highspeed = true;
693 f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
694 } else
695 f->descriptors = usb_copy_descriptors(f_audio_desc);
696
697 return 0;
698
699fail:
700
701 return status;
702}
703
704static void
705f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
706{
707 struct f_audio *audio = func_to_audio(f);
708
709 usb_free_descriptors(f->descriptors);
710 kfree(audio);
711}
712
713/*-------------------------------------------------------------------------*/
714
b95cd7ec
LP		 715static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
716{
717 con->data[cmd] = value;
718
719 return 0;
720}
721
722static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
723{
724 return con->data[cmd];
725}
726
c6994e6f
BW		 727/* Todo: add more control selecotor dynamically */
728int __init control_selector_init(struct f_audio *audio)
729{
730 INIT_LIST_HEAD(&audio->cs);
731 list_add(&feature_unit.list, &audio->cs);
732
733 INIT_LIST_HEAD(&feature_unit.control);
734 list_add(&mute_control.list, &feature_unit.control);
735 list_add(&volume_control.list, &feature_unit.control);
736
512ad27d
LP		 737 volume_control.data[UAC__CUR] = 0xffc0;
738 volume_control.data[UAC__MIN] = 0xe3a0;
739 volume_control.data[UAC__MAX] = 0xfff0;
740 volume_control.data[UAC__RES] = 0x0030;
c6994e6f
BW		 741
742 return 0;
743}
744
745/**
746 * audio_bind_config - add USB audio fucntion to a configuration
747 * @c: the configuration to supcard the USB audio function
748 * Context: single threaded during gadget setup
749 *
750 * Returns zero on success, else negative errno.
751 */
752int __init audio_bind_config(struct usb_configuration *c)
753{
754 struct f_audio *audio;
755 int status;
756
757 /* allocate and initialize one new instance */
758 audio = kzalloc(sizeof *audio, GFP_KERNEL);
759 if (!audio)
760 return -ENOMEM;
761
762 audio->card.func.name = "g_audio";
763 audio->card.gadget = c->cdev->gadget;
764
765 INIT_LIST_HEAD(&audio->play_queue);
766 spin_lock_init(&audio->lock);
767
768 /* set up ASLA audio devices */
769 status = gaudio_setup(&audio->card);
770 if (status < 0)
771 goto setup_fail;
772
773 audio->card.func.strings = audio_strings;
774 audio->card.func.bind = f_audio_bind;
775 audio->card.func.unbind = f_audio_unbind;
776 audio->card.func.set_alt = f_audio_set_alt;
777 audio->card.func.setup = f_audio_setup;
778 audio->card.func.disable = f_audio_disable;
779 audio->out_desc = &as_out_ep_desc;
780
781 control_selector_init(audio);
782
783 INIT_WORK(&audio->playback_work, f_audio_playback_work);
784
785 status = usb_add_function(c, &audio->card.func);
786 if (status)
787 goto add_fail;
788
789 INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
790 audio_buf_size, req_buf_size, req_count);
791
792 return status;
793
794add_fail:
feef1d95 795 gaudio_cleanup();
c6994e6f
BW		 796setup_fail:
797 kfree(audio);
798 return status;
799}
Linux 6.x block layer and io_uring tree(s)