]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/usb/gadget/function/f_uac1.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
usb: musb: Fix a few off-by-one lengths
[mirror_ubuntu-artful-kernel.git] / drivers / usb / gadget / function / f_uac1.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
5a0e3ad6 12#include <linux/slab.h>
c6994e6f 13#include <linux/kernel.h>
f3a3406b 14#include <linux/module.h>
c6994e6f 15#include <linux/device.h>
60063497 16#include <linux/atomic.h>
c6994e6f 17
18b5b3b5 18#include "u_uac1.h"
c6994e6f 19
b95cd7ec
LP		 20static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
21static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
22
c6994e6f
BW		 23/*
24 * DESCRIPTORS ... most are static, but strings and full
25 * configuration descriptors are built on demand.
26 */
27
28/*
29 * We have two interfaces- AudioControl and AudioStreaming
30 * TODO: only supcard playback currently
31 */
32#define F_AUDIO_AC_INTERFACE 0
33#define F_AUDIO_AS_INTERFACE 1
34#define F_AUDIO_NUM_INTERFACES 2
35
36/* B.3.1 Standard AC Interface Descriptor */
f3a3406b 37static struct usb_interface_descriptor ac_interface_desc = {
c6994e6f
BW		 38 .bLength = USB_DT_INTERFACE_SIZE,
39 .bDescriptorType = USB_DT_INTERFACE,
40 .bNumEndpoints = 0,
41 .bInterfaceClass = USB_CLASS_AUDIO,
42 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
43};
44
512ad27d 45DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
c6994e6f 46
512ad27d 47#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
d16f1726
CC		 48/* 1 input terminal, 1 output terminal and 1 feature unit */
49#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
50 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
c6994e6f 51/* B.3.2 Class-Specific AC Interface Descriptor */
69da9bcb 52static struct uac1_ac_header_descriptor_2 ac_header_desc = {
512ad27d 53 .bLength = UAC_DT_AC_HEADER_LENGTH,
c6994e6f 54 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 55 .bDescriptorSubtype = UAC_HEADER,
c6994e6f 56 .bcdADC = __constant_cpu_to_le16(0x0100),
d16f1726 57 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
c6994e6f
BW		 58 .bInCollection = F_AUDIO_NUM_INTERFACES,
59 .baInterfaceNr = {
60 [0] = F_AUDIO_AC_INTERFACE,
61 [1] = F_AUDIO_AS_INTERFACE,
62 }
63};
64
65#define INPUT_TERMINAL_ID 1
512ad27d
LP		 66static struct uac_input_terminal_descriptor input_terminal_desc = {
67 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
c6994e6f 68 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 69 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
c6994e6f 70 .bTerminalID = INPUT_TERMINAL_ID,
512ad27d 71 .wTerminalType = UAC_TERMINAL_STREAMING,
c6994e6f
BW		 72 .bAssocTerminal = 0,
73 .wChannelConfig = 0x3,
74};
75
512ad27d 76DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
c6994e6f
BW		 77
78#define FEATURE_UNIT_ID 2
512ad27d
LP		 79static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
80 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
c6994e6f 81 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 82 .bDescriptorSubtype = UAC_FEATURE_UNIT,
c6994e6f
BW		 83 .bUnitID = FEATURE_UNIT_ID,
84 .bSourceID = INPUT_TERMINAL_ID,
85 .bControlSize = 2,
512ad27d 86 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
c6994e6f
BW		 87};
88
89static struct usb_audio_control mute_control = {
90 .list = LIST_HEAD_INIT(mute_control.list),
91 .name = "Mute Control",
f07ff97b 92 .type = UAC_FU_MUTE,
c6994e6f
BW		 93 /* Todo: add real Mute control code */
94 .set = generic_set_cmd,
95 .get = generic_get_cmd,
96};
97
98static struct usb_audio_control volume_control = {
99 .list = LIST_HEAD_INIT(volume_control.list),
100 .name = "Volume Control",
f07ff97b 101 .type = UAC_FU_VOLUME,
c6994e6f
BW		 102 /* Todo: add real Volume control code */
103 .set = generic_set_cmd,
104 .get = generic_get_cmd,
105};
106
107static struct usb_audio_control_selector feature_unit = {
108 .list = LIST_HEAD_INIT(feature_unit.list),
109 .id = FEATURE_UNIT_ID,
110 .name = "Mute & Volume Control",
512ad27d 111 .type = UAC_FEATURE_UNIT,
c6994e6f
BW		 112 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
113};
114
115#define OUTPUT_TERMINAL_ID 3
69da9bcb 116static struct uac1_output_terminal_descriptor output_terminal_desc = {
512ad27d 117 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
c6994e6f 118 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 119 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
c6994e6f 120 .bTerminalID = OUTPUT_TERMINAL_ID,
512ad27d 121 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
c6994e6f
BW		 122 .bAssocTerminal = FEATURE_UNIT_ID,
123 .bSourceID = FEATURE_UNIT_ID,
124};
125
126/* B.4.1 Standard AS Interface Descriptor */
127static struct usb_interface_descriptor as_interface_alt_0_desc = {
128 .bLength = USB_DT_INTERFACE_SIZE,
129 .bDescriptorType = USB_DT_INTERFACE,
130 .bAlternateSetting = 0,
131 .bNumEndpoints = 0,
132 .bInterfaceClass = USB_CLASS_AUDIO,
133 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
134};
135
136static struct usb_interface_descriptor as_interface_alt_1_desc = {
137 .bLength = USB_DT_INTERFACE_SIZE,
138 .bDescriptorType = USB_DT_INTERFACE,
139 .bAlternateSetting = 1,
140 .bNumEndpoints = 1,
141 .bInterfaceClass = USB_CLASS_AUDIO,
142 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
143};
144
145/* B.4.2 Class-Specific AS Interface Descriptor */
69da9bcb 146static struct uac1_as_header_descriptor as_header_desc = {
512ad27d 147 .bLength = UAC_DT_AS_HEADER_SIZE,
c6994e6f 148 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 149 .bDescriptorSubtype = UAC_AS_GENERAL,
c6994e6f
BW		 150 .bTerminalLink = INPUT_TERMINAL_ID,
151 .bDelay = 1,
512ad27d 152 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
c6994e6f
BW		 153};
154
512ad27d 155DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
c6994e6f 156
512ad27d
LP		 157static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
158 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
c6994e6f 159 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d
LP		 160 .bDescriptorSubtype = UAC_FORMAT_TYPE,
161 .bFormatType = UAC_FORMAT_TYPE_I,
c6994e6f
BW		 162 .bSubframeSize = 2,
163 .bBitResolution = 16,
164 .bSamFreqType = 1,
165};
166
167/* Standard ISO OUT Endpoint Descriptor */
e6251a92 168static struct usb_endpoint_descriptor as_out_ep_desc = {
c6994e6f
BW		 169 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
170 .bDescriptorType = USB_DT_ENDPOINT,
171 .bEndpointAddress = USB_DIR_OUT,
85e08ca5 172 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
c6994e6f 173 | USB_ENDPOINT_XFER_ISOC,
bcec9784 174 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
c6994e6f
BW		 175 .bInterval = 4,
176};
177
178/* Class-specific AS ISO OUT Endpoint Descriptor */
f3a3406b 179static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
512ad27d 180 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
c6994e6f 181 .bDescriptorType = USB_DT_CS_ENDPOINT,
512ad27d 182 .bDescriptorSubtype = UAC_EP_GENERAL,
c6994e6f
BW		 183 .bmAttributes = 1,
184 .bLockDelayUnits = 1,
185 .wLockDelay = __constant_cpu_to_le16(1),
186};
187
f3a3406b 188static struct usb_descriptor_header *f_audio_desc[] = {
c6994e6f
BW		 189 (struct usb_descriptor_header *)&ac_interface_desc,
190 (struct usb_descriptor_header *)&ac_header_desc,
191
192 (struct usb_descriptor_header *)&input_terminal_desc,
193 (struct usb_descriptor_header *)&output_terminal_desc,
194 (struct usb_descriptor_header *)&feature_unit_desc,
195
196 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
197 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
198 (struct usb_descriptor_header *)&as_header_desc,
199
200 (struct usb_descriptor_header *)&as_type_i_desc,
201
202 (struct usb_descriptor_header *)&as_out_ep_desc,
203 (struct usb_descriptor_header *)&as_iso_out_desc,
204 NULL,
205};
206
f73db69f
AP		 207enum {
208 STR_AC_IF,
209 STR_INPUT_TERMINAL,
210 STR_INPUT_TERMINAL_CH_NAMES,
211 STR_FEAT_DESC_0,
212 STR_OUTPUT_TERMINAL,
213 STR_AS_IF_ALT0,
214 STR_AS_IF_ALT1,
215};
216
217static struct usb_string strings_uac1[] = {
218 [STR_AC_IF].s = "AC Interface",
219 [STR_INPUT_TERMINAL].s = "Input terminal",
220 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
221 [STR_FEAT_DESC_0].s = "Volume control & mute",
222 [STR_OUTPUT_TERMINAL].s = "Output terminal",
223 [STR_AS_IF_ALT0].s = "AS Interface",
224 [STR_AS_IF_ALT1].s = "AS Interface",
225 { },
226};
227
228static struct usb_gadget_strings str_uac1 = {
229 .language = 0x0409, /* en-us */
230 .strings = strings_uac1,
231};
232
233static struct usb_gadget_strings *uac1_strings[] = {
234 &str_uac1,
235 NULL,
236};
237
c6994e6f
BW		 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)
ff3b968c 255 return ERR_PTR(-ENOMEM);
c6994e6f
BW		 256
257 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
258 if (!copy_buf->buf) {
259 kfree(copy_buf);
ff3b968c 260 return ERR_PTR(-ENOMEM);
c6994e6f
BW		 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;
c6994e6f
BW		 278
279 spinlock_t lock;
280 struct f_audio_buf *copy_buf;
281 struct work_struct playback_work;
282 struct list_head play_queue;
283
284 /* Control Set command */
285 struct list_head cs;
286 u8 set_cmd;
287 struct usb_audio_control *set_con;
288};
289
290static inline struct f_audio *func_to_audio(struct usb_function *f)
291{
292 return container_of(f, struct f_audio, card.func);
293}
294
295/*-------------------------------------------------------------------------*/
296
297static void f_audio_playback_work(struct work_struct *data)
298{
299 struct f_audio *audio = container_of(data, struct f_audio,
300 playback_work);
301 struct f_audio_buf *play_buf;
302
303 spin_lock_irq(&audio->lock);
304 if (list_empty(&audio->play_queue)) {
305 spin_unlock_irq(&audio->lock);
306 return;
307 }
308 play_buf = list_first_entry(&audio->play_queue,
309 struct f_audio_buf, list);
310 list_del(&play_buf->list);
311 spin_unlock_irq(&audio->lock);
312
313 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
314 f_audio_buffer_free(play_buf);
c6994e6f
BW		 315}
316
317static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
318{
319 struct f_audio *audio = req->context;
320 struct usb_composite_dev *cdev = audio->card.func.config->cdev;
321 struct f_audio_buf *copy_buf = audio->copy_buf;
f3a3406b
AP		 322 struct f_uac1_opts *opts;
323 int audio_buf_size;
c6994e6f
BW		 324 int err;
325
f3a3406b
AP		 326 opts = container_of(audio->card.func.fi, struct f_uac1_opts,
327 func_inst);
328 audio_buf_size = opts->audio_buf_size;
605ef833 329
c6994e6f
BW		 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;
fddedd83 446 len = min_t(size_t, sizeof(value), len);
c6994e6f
BW		 447 memcpy(req->buf, &value, len);
448
449 return len;
450}
451
0ad72524
LP		 452static int audio_set_endpoint_req(struct usb_function *f,
453 const struct usb_ctrlrequest *ctrl)
454{
455 struct usb_composite_dev *cdev = f->config->cdev;
456 int value = -EOPNOTSUPP;
457 u16 ep = le16_to_cpu(ctrl->wIndex);
458 u16 len = le16_to_cpu(ctrl->wLength);
459 u16 w_value = le16_to_cpu(ctrl->wValue);
460
461 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
462 ctrl->bRequest, w_value, len, ep);
463
464 switch (ctrl->bRequest) {
465 case UAC_SET_CUR:
7c5881d1 466 value = len;
0ad72524
LP		 467 break;
468
469 case UAC_SET_MIN:
470 break;
471
472 case UAC_SET_MAX:
473 break;
474
475 case UAC_SET_RES:
476 break;
477
478 case UAC_SET_MEM:
479 break;
480
481 default:
482 break;
483 }
484
485 return value;
486}
487
488static int audio_get_endpoint_req(struct usb_function *f,
489 const struct usb_ctrlrequest *ctrl)
490{
491 struct usb_composite_dev *cdev = f->config->cdev;
492 int value = -EOPNOTSUPP;
493 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
494 u16 len = le16_to_cpu(ctrl->wLength);
495 u16 w_value = le16_to_cpu(ctrl->wValue);
496
497 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
498 ctrl->bRequest, w_value, len, ep);
499
500 switch (ctrl->bRequest) {
501 case UAC_GET_CUR:
502 case UAC_GET_MIN:
503 case UAC_GET_MAX:
504 case UAC_GET_RES:
7c5881d1 505 value = len;
0ad72524
LP		 506 break;
507 case UAC_GET_MEM:
508 break;
509 default:
510 break;
511 }
512
513 return value;
514}
515
c6994e6f
BW		 516static int
517f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
518{
519 struct usb_composite_dev *cdev = f->config->cdev;
520 struct usb_request *req = cdev->req;
521 int value = -EOPNOTSUPP;
522 u16 w_index = le16_to_cpu(ctrl->wIndex);
523 u16 w_value = le16_to_cpu(ctrl->wValue);
524 u16 w_length = le16_to_cpu(ctrl->wLength);
525
0ad72524
LP		 526 /* composite driver infrastructure handles everything; interface
527 * activation uses set_alt().
c6994e6f
BW		 528 */
529 switch (ctrl->bRequestType) {
512ad27d 530 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 531 value = audio_set_intf_req(f, ctrl);
532 break;
533
512ad27d 534 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 535 value = audio_get_intf_req(f, ctrl);
536 break;
537
0ad72524
LP		 538 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
539 value = audio_set_endpoint_req(f, ctrl);
540 break;
541
542 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
543 value = audio_get_endpoint_req(f, ctrl);
544 break;
545
c6994e6f
BW		 546 default:
547 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
548 ctrl->bRequestType, ctrl->bRequest,
549 w_value, w_index, w_length);
550 }
551
552 /* respond with data transfer or status phase? */
553 if (value >= 0) {
554 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
555 ctrl->bRequestType, ctrl->bRequest,
556 w_value, w_index, w_length);
557 req->zero = 0;
558 req->length = value;
559 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
560 if (value < 0)
561 ERROR(cdev, "audio response on err %d\n", value);
562 }
563
564 /* device either stalls (value < 0) or reports success */
565 return value;
566}
567
568static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
569{
570 struct f_audio *audio = func_to_audio(f);
571 struct usb_composite_dev *cdev = f->config->cdev;
572 struct usb_ep *out_ep = audio->out_ep;
573 struct usb_request *req;
f3a3406b
AP		 574 struct f_uac1_opts *opts;
575 int req_buf_size, req_count, audio_buf_size;
c6994e6f
BW		 576 int i = 0, err = 0;
577
578 DBG(cdev, "intf %d, alt %d\n", intf, alt);
579
f3a3406b
AP		 580 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
581 req_buf_size = opts->req_buf_size;
582 req_count = opts->req_count;
583 audio_buf_size = opts->audio_buf_size;
584
c6994e6f
BW		 585 if (intf == 1) {
586 if (alt == 1) {
72c973dd 587 usb_ep_enable(out_ep);
c6994e6f
BW		 588 out_ep->driver_data = audio;
589 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
ff3b968c
JL		 590 if (IS_ERR(audio->copy_buf))
591 return -ENOMEM;
c6994e6f
BW		 592
593 /*
594 * allocate a bunch of read buffers
595 * and queue them all at once.
596 */
597 for (i = 0; i < req_count && err == 0; i++) {
598 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
599 if (req) {
600 req->buf = kzalloc(req_buf_size,
601 GFP_ATOMIC);
602 if (req->buf) {
603 req->length = req_buf_size;
604 req->context = audio;
605 req->complete =
606 f_audio_complete;
607 err = usb_ep_queue(out_ep,
608 req, GFP_ATOMIC);
609 if (err)
610 ERROR(cdev,
611 "%s queue req: %d\n",
612 out_ep->name, err);
613 } else
614 err = -ENOMEM;
615 } else
616 err = -ENOMEM;
617 }
618
619 } else {
620 struct f_audio_buf *copy_buf = audio->copy_buf;
621 if (copy_buf) {
622 list_add_tail(&copy_buf->list,
623 &audio->play_queue);
624 schedule_work(&audio->playback_work);
625 }
626 }
627 }
628
629 return err;
630}
631
632static void f_audio_disable(struct usb_function *f)
633{
634 return;
635}
636
637/*-------------------------------------------------------------------------*/
638
639static void f_audio_build_desc(struct f_audio *audio)
640{
641 struct gaudio *card = &audio->card;
642 u8 *sam_freq;
643 int rate;
644
645 /* Set channel numbers */
646 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
647 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
648
649 /* Set sample rates */
650 rate = u_audio_get_playback_rate(card);
651 sam_freq = as_type_i_desc.tSamFreq[0];
652 memcpy(sam_freq, &rate, 3);
653
654 /* Todo: Set Sample bits and other parameters */
655
656 return;
657}
658
659/* audio function driver setup/binding */
f3a3406b 660static int
c6994e6f
BW		 661f_audio_bind(struct usb_configuration *c, struct usb_function *f)
662{
663 struct usb_composite_dev *cdev = c->cdev;
664 struct f_audio *audio = func_to_audio(f);
807dccdb 665 struct usb_string *us;
c6994e6f 666 int status;
10287bae 667 struct usb_ep *ep = NULL;
f3a3406b
AP		 668 struct f_uac1_opts *audio_opts;
669
670 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
671 audio->card.gadget = c->cdev->gadget;
672 audio_opts->card = &audio->card;
673 /* set up ASLA audio devices */
674 if (!audio_opts->bound) {
675 status = gaudio_setup(&audio->card);
676 if (status < 0)
677 return status;
678 audio_opts->bound = true;
679 }
807dccdb
AP		 680 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
681 if (IS_ERR(us))
682 return PTR_ERR(us);
683 ac_interface_desc.iInterface = us[STR_AC_IF].id;
684 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
685 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
686 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
687 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
688 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
689 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
690
c6994e6f
BW		 691
692 f_audio_build_desc(audio);
693
694 /* allocate instance-specific interface IDs, and patch descriptors */
695 status = usb_interface_id(c, f);
696 if (status < 0)
697 goto fail;
698 ac_interface_desc.bInterfaceNumber = status;
699
700 status = usb_interface_id(c, f);
701 if (status < 0)
702 goto fail;
703 as_interface_alt_0_desc.bInterfaceNumber = status;
704 as_interface_alt_1_desc.bInterfaceNumber = status;
705
706 status = -ENODEV;
707
708 /* allocate instance-specific endpoints */
709 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
710 if (!ep)
711 goto fail;
712 audio->out_ep = ep;
72c973dd 713 audio->out_ep->desc = &as_out_ep_desc;
c6994e6f
BW		 714 ep->driver_data = cdev; /* claim */
715
716 status = -ENOMEM;
717
ef7f584c 718 /* copy descriptors, and track endpoint copies */
10287bae
SAS		 719 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL);
720 if (status)
721 goto fail;
c6994e6f
BW		 722 return 0;
723
724fail:
f3a3406b 725 gaudio_cleanup(&audio->card);
10287bae
SAS		 726 if (ep)
727 ep->driver_data = NULL;
c6994e6f
BW		 728 return status;
729}
730
c6994e6f
BW		 731/*-------------------------------------------------------------------------*/
732
b95cd7ec
LP		 733static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
734{
735 con->data[cmd] = value;
736
737 return 0;
738}
739
740static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
741{
742 return con->data[cmd];
743}
744
c6994e6f 745/* Todo: add more control selecotor dynamically */
f3a3406b 746static int control_selector_init(struct f_audio *audio)
c6994e6f
BW		 747{
748 INIT_LIST_HEAD(&audio->cs);
749 list_add(&feature_unit.list, &audio->cs);
750
751 INIT_LIST_HEAD(&feature_unit.control);
752 list_add(&mute_control.list, &feature_unit.control);
753 list_add(&volume_control.list, &feature_unit.control);
754
512ad27d
LP		 755 volume_control.data[UAC__CUR] = 0xffc0;
756 volume_control.data[UAC__MIN] = 0xe3a0;
757 volume_control.data[UAC__MAX] = 0xfff0;
758 volume_control.data[UAC__RES] = 0x0030;
c6994e6f
BW		 759
760 return 0;
761}
762
0854611a
AP		 763static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
764{
765 return container_of(to_config_group(item), struct f_uac1_opts,
766 func_inst.group);
767}
768
769CONFIGFS_ATTR_STRUCT(f_uac1_opts);
770CONFIGFS_ATTR_OPS(f_uac1_opts);
771
772static void f_uac1_attr_release(struct config_item *item)
773{
774 struct f_uac1_opts *opts = to_f_uac1_opts(item);
775
776 usb_put_function_instance(&opts->func_inst);
777}
778
779static struct configfs_item_operations f_uac1_item_ops = {
780 .release = f_uac1_attr_release,
781 .show_attribute = f_uac1_opts_attr_show,
782 .store_attribute = f_uac1_opts_attr_store,
783};
784
785#define UAC1_INT_ATTRIBUTE(name) \
786static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
787 char *page) \
788{ \
789 int result; \
790 \
791 mutex_lock(&opts->lock); \
792 result = sprintf(page, "%u\n", opts->name); \
793 mutex_unlock(&opts->lock); \
794 \
795 return result; \
796} \
797 \
798static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
799 const char *page, size_t len) \
800{ \
801 int ret; \
802 u32 num; \
803 \
804 mutex_lock(&opts->lock); \
805 if (opts->refcnt) { \
806 ret = -EBUSY; \
807 goto end; \
808 } \
809 \
810 ret = kstrtou32(page, 0, &num); \
811 if (ret) \
812 goto end; \
813 \
814 opts->name = num; \
815 ret = len; \
816 \
817end: \
818 mutex_unlock(&opts->lock); \
819 return ret; \
820} \
821 \
822static struct f_uac1_opts_attribute f_uac1_opts_##name = \
823 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
824 f_uac1_opts_##name##_show, \
825 f_uac1_opts_##name##_store)
826
827UAC1_INT_ATTRIBUTE(req_buf_size);
828UAC1_INT_ATTRIBUTE(req_count);
829UAC1_INT_ATTRIBUTE(audio_buf_size);
830
831#define UAC1_STR_ATTRIBUTE(name) \
832static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
833 char *page) \
834{ \
835 int result; \
836 \
837 mutex_lock(&opts->lock); \
838 result = sprintf(page, "%s\n", opts->name); \
839 mutex_unlock(&opts->lock); \
840 \
841 return result; \
842} \
843 \
844static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
845 const char *page, size_t len) \
846{ \
847 int ret = -EBUSY; \
848 char *tmp; \
849 \
850 mutex_lock(&opts->lock); \
851 if (opts->refcnt) \
852 goto end; \
853 \
854 tmp = kstrndup(page, len, GFP_KERNEL); \
855 if (tmp) { \
856 ret = -ENOMEM; \
857 goto end; \
858 } \
859 if (opts->name##_alloc) \
860 kfree(opts->name); \
861 opts->name##_alloc = true; \
862 opts->name = tmp; \
863 ret = len; \
864 \
865end: \
866 mutex_unlock(&opts->lock); \
867 return ret; \
868} \
869 \
870static struct f_uac1_opts_attribute f_uac1_opts_##name = \
871 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
872 f_uac1_opts_##name##_show, \
873 f_uac1_opts_##name##_store)
874
875UAC1_STR_ATTRIBUTE(fn_play);
876UAC1_STR_ATTRIBUTE(fn_cap);
877UAC1_STR_ATTRIBUTE(fn_cntl);
878
879static struct configfs_attribute *f_uac1_attrs[] = {
880 &f_uac1_opts_req_buf_size.attr,
881 &f_uac1_opts_req_count.attr,
882 &f_uac1_opts_audio_buf_size.attr,
883 &f_uac1_opts_fn_play.attr,
884 &f_uac1_opts_fn_cap.attr,
885 &f_uac1_opts_fn_cntl.attr,
886 NULL,
887};
888
889static struct config_item_type f_uac1_func_type = {
890 .ct_item_ops = &f_uac1_item_ops,
891 .ct_attrs = f_uac1_attrs,
892 .ct_owner = THIS_MODULE,
893};
894
f3a3406b
AP		 895static void f_audio_free_inst(struct usb_function_instance *f)
896{
897 struct f_uac1_opts *opts;
898
899 opts = container_of(f, struct f_uac1_opts, func_inst);
900 gaudio_cleanup(opts->card);
0854611a
AP		 901 if (opts->fn_play_alloc)
902 kfree(opts->fn_play);
903 if (opts->fn_cap_alloc)
904 kfree(opts->fn_cap);
905 if (opts->fn_cntl_alloc)
906 kfree(opts->fn_cntl);
f3a3406b
AP		 907 kfree(opts);
908}
909
910static struct usb_function_instance *f_audio_alloc_inst(void)
911{
912 struct f_uac1_opts *opts;
913
914 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
915 if (!opts)
916 return ERR_PTR(-ENOMEM);
917
0854611a 918 mutex_init(&opts->lock);
f3a3406b
AP		 919 opts->func_inst.free_func_inst = f_audio_free_inst;
920
0854611a
AP		 921 config_group_init_type_name(&opts->func_inst.group, "",
922 &f_uac1_func_type);
923
924 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
925 opts->req_count = UAC1_REQ_COUNT;
926 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
927 opts->fn_play = FILE_PCM_PLAYBACK;
928 opts->fn_cap = FILE_PCM_CAPTURE;
929 opts->fn_cntl = FILE_CONTROL;
f3a3406b
AP		 930 return &opts->func_inst;
931}
932
933static void f_audio_free(struct usb_function *f)
934{
935 struct f_audio *audio = func_to_audio(f);
0854611a 936 struct f_uac1_opts *opts;
f3a3406b 937
0854611a 938 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
f3a3406b 939 kfree(audio);
0854611a
AP		 940 mutex_lock(&opts->lock);
941 --opts->refcnt;
942 mutex_unlock(&opts->lock);
f3a3406b
AP		 943}
944
945static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
946{
947 usb_free_all_descriptors(f);
948}
949
950static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
951{
952 struct f_audio *audio;
0854611a 953 struct f_uac1_opts *opts;
f3a3406b
AP		 954
955 /* allocate and initialize one new instance */
956 audio = kzalloc(sizeof(*audio), GFP_KERNEL);
957 if (!audio)
958 return ERR_PTR(-ENOMEM);
959
960 audio->card.func.name = "g_audio";
961
0854611a
AP		 962 opts = container_of(fi, struct f_uac1_opts, func_inst);
963 mutex_lock(&opts->lock);
964 ++opts->refcnt;
965 mutex_unlock(&opts->lock);
f3a3406b
AP		 966 INIT_LIST_HEAD(&audio->play_queue);
967 spin_lock_init(&audio->lock);
968
f3a3406b
AP		 969 audio->card.func.bind = f_audio_bind;
970 audio->card.func.unbind = f_audio_unbind;
971 audio->card.func.set_alt = f_audio_set_alt;
972 audio->card.func.setup = f_audio_setup;
973 audio->card.func.disable = f_audio_disable;
974 audio->card.func.free_func = f_audio_free;
975
976 control_selector_init(audio);
977
978 INIT_WORK(&audio->playback_work, f_audio_playback_work);
979
980 return &audio->card.func;
981}
982
983DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
984MODULE_LICENSE("GPL");
985MODULE_AUTHOR("Bryan Wu");
Ubuntu Artful kernel mirror