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Linux 4.2.1
[linux/fpc-iii.git] / drivers / usb / gadget / function / f_uac1.c
blob7856b3394494b7d4250637277dd1f42f45d7a1ea
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/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/atomic.h>
17
18 #include "u_uac1.h"
19
20 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
21 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
22
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 1
35
36 /* B.3.1 Standard AC Interface Descriptor */
37 static struct usb_interface_descriptor ac_interface_desc = {
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
45 /*
46 * The number of AudioStreaming and MIDIStreaming interfaces
47 * in the Audio Interface Collection
48 */
49 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
50
51 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
52 /* 1 input terminal, 1 output terminal and 1 feature unit */
53 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
54 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
55 /* B.3.2 Class-Specific AC Interface Descriptor */
56 static struct uac1_ac_header_descriptor_1 ac_header_desc = {
57 .bLength = UAC_DT_AC_HEADER_LENGTH,
58 .bDescriptorType = USB_DT_CS_INTERFACE,
59 .bDescriptorSubtype = UAC_HEADER,
60 .bcdADC = __constant_cpu_to_le16(0x0100),
61 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
62 .bInCollection = F_AUDIO_NUM_INTERFACES,
63 .baInterfaceNr = {
64 /* Interface number of the first AudioStream interface */
65 [0] = 1,
66 }
67 };
68
69 #define INPUT_TERMINAL_ID 1
70 static struct uac_input_terminal_descriptor input_terminal_desc = {
71 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
72 .bDescriptorType = USB_DT_CS_INTERFACE,
73 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
74 .bTerminalID = INPUT_TERMINAL_ID,
75 .wTerminalType = UAC_TERMINAL_STREAMING,
76 .bAssocTerminal = 0,
77 .wChannelConfig = 0x3,
78 };
79
80 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
81
82 #define FEATURE_UNIT_ID 2
83 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
84 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
85 .bDescriptorType = USB_DT_CS_INTERFACE,
86 .bDescriptorSubtype = UAC_FEATURE_UNIT,
87 .bUnitID = FEATURE_UNIT_ID,
88 .bSourceID = INPUT_TERMINAL_ID,
89 .bControlSize = 2,
90 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
91 };
92
93 static struct usb_audio_control mute_control = {
94 .list = LIST_HEAD_INIT(mute_control.list),
95 .name = "Mute Control",
96 .type = UAC_FU_MUTE,
97 /* Todo: add real Mute control code */
98 .set = generic_set_cmd,
99 .get = generic_get_cmd,
100 };
101
102 static struct usb_audio_control volume_control = {
103 .list = LIST_HEAD_INIT(volume_control.list),
104 .name = "Volume Control",
105 .type = UAC_FU_VOLUME,
106 /* Todo: add real Volume control code */
107 .set = generic_set_cmd,
108 .get = generic_get_cmd,
109 };
110
111 static struct usb_audio_control_selector feature_unit = {
112 .list = LIST_HEAD_INIT(feature_unit.list),
113 .id = FEATURE_UNIT_ID,
114 .name = "Mute & Volume Control",
115 .type = UAC_FEATURE_UNIT,
116 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
117 };
118
119 #define OUTPUT_TERMINAL_ID 3
120 static struct uac1_output_terminal_descriptor output_terminal_desc = {
121 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
122 .bDescriptorType = USB_DT_CS_INTERFACE,
123 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
124 .bTerminalID = OUTPUT_TERMINAL_ID,
125 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
126 .bAssocTerminal = FEATURE_UNIT_ID,
127 .bSourceID = FEATURE_UNIT_ID,
128 };
129
130 /* B.4.1 Standard AS Interface Descriptor */
131 static struct usb_interface_descriptor as_interface_alt_0_desc = {
132 .bLength = USB_DT_INTERFACE_SIZE,
133 .bDescriptorType = USB_DT_INTERFACE,
134 .bAlternateSetting = 0,
135 .bNumEndpoints = 0,
136 .bInterfaceClass = USB_CLASS_AUDIO,
137 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
138 };
139
140 static struct usb_interface_descriptor as_interface_alt_1_desc = {
141 .bLength = USB_DT_INTERFACE_SIZE,
142 .bDescriptorType = USB_DT_INTERFACE,
143 .bAlternateSetting = 1,
144 .bNumEndpoints = 1,
145 .bInterfaceClass = USB_CLASS_AUDIO,
146 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
147 };
148
149 /* B.4.2 Class-Specific AS Interface Descriptor */
150 static struct uac1_as_header_descriptor as_header_desc = {
151 .bLength = UAC_DT_AS_HEADER_SIZE,
152 .bDescriptorType = USB_DT_CS_INTERFACE,
153 .bDescriptorSubtype = UAC_AS_GENERAL,
154 .bTerminalLink = INPUT_TERMINAL_ID,
155 .bDelay = 1,
156 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
157 };
158
159 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
160
161 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
162 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
163 .bDescriptorType = USB_DT_CS_INTERFACE,
164 .bDescriptorSubtype = UAC_FORMAT_TYPE,
165 .bFormatType = UAC_FORMAT_TYPE_I,
166 .bSubframeSize = 2,
167 .bBitResolution = 16,
168 .bSamFreqType = 1,
169 };
170
171 /* Standard ISO OUT Endpoint Descriptor */
172 static struct usb_endpoint_descriptor as_out_ep_desc = {
173 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
174 .bDescriptorType = USB_DT_ENDPOINT,
175 .bEndpointAddress = USB_DIR_OUT,
176 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
177 | USB_ENDPOINT_XFER_ISOC,
178 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
179 .bInterval = 4,
180 };
181
182 /* Class-specific AS ISO OUT Endpoint Descriptor */
183 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
184 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
185 .bDescriptorType = USB_DT_CS_ENDPOINT,
186 .bDescriptorSubtype = UAC_EP_GENERAL,
187 .bmAttributes = 1,
188 .bLockDelayUnits = 1,
189 .wLockDelay = __constant_cpu_to_le16(1),
190 };
191
192 static struct usb_descriptor_header *f_audio_desc[] = {
193 (struct usb_descriptor_header *)&ac_interface_desc,
194 (struct usb_descriptor_header *)&ac_header_desc,
195
196 (struct usb_descriptor_header *)&input_terminal_desc,
197 (struct usb_descriptor_header *)&output_terminal_desc,
198 (struct usb_descriptor_header *)&feature_unit_desc,
199
200 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
201 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
202 (struct usb_descriptor_header *)&as_header_desc,
203
204 (struct usb_descriptor_header *)&as_type_i_desc,
205
206 (struct usb_descriptor_header *)&as_out_ep_desc,
207 (struct usb_descriptor_header *)&as_iso_out_desc,
208 NULL,
209 };
210
211 enum {
212 STR_AC_IF,
213 STR_INPUT_TERMINAL,
214 STR_INPUT_TERMINAL_CH_NAMES,
215 STR_FEAT_DESC_0,
216 STR_OUTPUT_TERMINAL,
217 STR_AS_IF_ALT0,
218 STR_AS_IF_ALT1,
219 };
220
221 static struct usb_string strings_uac1[] = {
222 [STR_AC_IF].s = "AC Interface",
223 [STR_INPUT_TERMINAL].s = "Input terminal",
224 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
225 [STR_FEAT_DESC_0].s = "Volume control & mute",
226 [STR_OUTPUT_TERMINAL].s = "Output terminal",
227 [STR_AS_IF_ALT0].s = "AS Interface",
228 [STR_AS_IF_ALT1].s = "AS Interface",
229 { },
230 };
231
232 static struct usb_gadget_strings str_uac1 = {
233 .language = 0x0409, /* en-us */
234 .strings = strings_uac1,
235 };
236
237 static struct usb_gadget_strings *uac1_strings[] = {
238 &str_uac1,
239 NULL,
240 };
241
242 /*
243 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
244 */
245
246 /*-------------------------------------------------------------------------*/
247 struct f_audio_buf {
248 u8 *buf;
249 int actual;
250 struct list_head list;
251 };
252
253 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
254 {
255 struct f_audio_buf *copy_buf;
256
257 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
258 if (!copy_buf)
259 return ERR_PTR(-ENOMEM);
260
261 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
262 if (!copy_buf->buf) {
263 kfree(copy_buf);
264 return ERR_PTR(-ENOMEM);
265 }
266
267 return copy_buf;
268 }
269
270 static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
271 {
272 kfree(audio_buf->buf);
273 kfree(audio_buf);
274 }
275 /*-------------------------------------------------------------------------*/
276
277 struct f_audio {
278 struct gaudio card;
279
280 /* endpoints handle full and/or high speeds */
281 struct usb_ep *out_ep;
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
294 static 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
301 static 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
321 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
322 {
323 struct f_audio *audio = req->context;
324 struct usb_composite_dev *cdev = audio->card.func.config->cdev;
325 struct f_audio_buf *copy_buf = audio->copy_buf;
326 struct f_uac1_opts *opts;
327 int audio_buf_size;
328 int err;
329
330 opts = container_of(audio->card.func.fi, struct f_uac1_opts,
331 func_inst);
332 audio_buf_size = opts->audio_buf_size;
333
334 if (!copy_buf)
335 return -EINVAL;
336
337 /* Copy buffer is full, add it to the play_queue */
338 if (audio_buf_size - copy_buf->actual < req->actual) {
339 list_add_tail(&copy_buf->list, &audio->play_queue);
340 schedule_work(&audio->playback_work);
341 copy_buf = f_audio_buffer_alloc(audio_buf_size);
342 if (IS_ERR(copy_buf))
343 return -ENOMEM;
344 }
345
346 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
347 copy_buf->actual += req->actual;
348 audio->copy_buf = copy_buf;
349
350 err = usb_ep_queue(ep, req, GFP_ATOMIC);
351 if (err)
352 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
353
354 return 0;
355
356 }
357
358 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
359 {
360 struct f_audio *audio = req->context;
361 int status = req->status;
362 u32 data = 0;
363 struct usb_ep *out_ep = audio->out_ep;
364
365 switch (status) {
366
367 case 0: /* normal completion? */
368 if (ep == out_ep)
369 f_audio_out_ep_complete(ep, req);
370 else if (audio->set_con) {
371 memcpy(&data, req->buf, req->length);
372 audio->set_con->set(audio->set_con, audio->set_cmd,
373 le16_to_cpu(data));
374 audio->set_con = NULL;
375 }
376 break;
377 default:
378 break;
379 }
380 }
381
382 static int audio_set_intf_req(struct usb_function *f,
383 const struct usb_ctrlrequest *ctrl)
384 {
385 struct f_audio *audio = func_to_audio(f);
386 struct usb_composite_dev *cdev = f->config->cdev;
387 struct usb_request *req = cdev->req;
388 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
389 u16 len = le16_to_cpu(ctrl->wLength);
390 u16 w_value = le16_to_cpu(ctrl->wValue);
391 u8 con_sel = (w_value >> 8) & 0xFF;
392 u8 cmd = (ctrl->bRequest & 0x0F);
393 struct usb_audio_control_selector *cs;
394 struct usb_audio_control *con;
395
396 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
397 ctrl->bRequest, w_value, len, id);
398
399 list_for_each_entry(cs, &audio->cs, list) {
400 if (cs->id == id) {
401 list_for_each_entry(con, &cs->control, list) {
402 if (con->type == con_sel) {
403 audio->set_con = con;
404 break;
405 }
406 }
407 break;
408 }
409 }
410
411 audio->set_cmd = cmd;
412 req->context = audio;
413 req->complete = f_audio_complete;
414
415 return len;
416 }
417
418 static int audio_get_intf_req(struct usb_function *f,
419 const struct usb_ctrlrequest *ctrl)
420 {
421 struct f_audio *audio = func_to_audio(f);
422 struct usb_composite_dev *cdev = f->config->cdev;
423 struct usb_request *req = cdev->req;
424 int value = -EOPNOTSUPP;
425 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
426 u16 len = le16_to_cpu(ctrl->wLength);
427 u16 w_value = le16_to_cpu(ctrl->wValue);
428 u8 con_sel = (w_value >> 8) & 0xFF;
429 u8 cmd = (ctrl->bRequest & 0x0F);
430 struct usb_audio_control_selector *cs;
431 struct usb_audio_control *con;
432
433 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
434 ctrl->bRequest, w_value, len, id);
435
436 list_for_each_entry(cs, &audio->cs, list) {
437 if (cs->id == id) {
438 list_for_each_entry(con, &cs->control, list) {
439 if (con->type == con_sel && con->get) {
440 value = con->get(con, cmd);
441 break;
442 }
443 }
444 break;
445 }
446 }
447
448 req->context = audio;
449 req->complete = f_audio_complete;
450 len = min_t(size_t, sizeof(value), len);
451 memcpy(req->buf, &value, len);
452
453 return len;
454 }
455
456 static int audio_set_endpoint_req(struct usb_function *f,
457 const struct usb_ctrlrequest *ctrl)
458 {
459 struct usb_composite_dev *cdev = f->config->cdev;
460 int value = -EOPNOTSUPP;
461 u16 ep = le16_to_cpu(ctrl->wIndex);
462 u16 len = le16_to_cpu(ctrl->wLength);
463 u16 w_value = le16_to_cpu(ctrl->wValue);
464
465 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
466 ctrl->bRequest, w_value, len, ep);
467
468 switch (ctrl->bRequest) {
469 case UAC_SET_CUR:
470 value = len;
471 break;
472
473 case UAC_SET_MIN:
474 break;
475
476 case UAC_SET_MAX:
477 break;
478
479 case UAC_SET_RES:
480 break;
481
482 case UAC_SET_MEM:
483 break;
484
485 default:
486 break;
487 }
488
489 return value;
490 }
491
492 static int audio_get_endpoint_req(struct usb_function *f,
493 const struct usb_ctrlrequest *ctrl)
494 {
495 struct usb_composite_dev *cdev = f->config->cdev;
496 int value = -EOPNOTSUPP;
497 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
498 u16 len = le16_to_cpu(ctrl->wLength);
499 u16 w_value = le16_to_cpu(ctrl->wValue);
500
501 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
502 ctrl->bRequest, w_value, len, ep);
503
504 switch (ctrl->bRequest) {
505 case UAC_GET_CUR:
506 case UAC_GET_MIN:
507 case UAC_GET_MAX:
508 case UAC_GET_RES:
509 value = len;
510 break;
511 case UAC_GET_MEM:
512 break;
513 default:
514 break;
515 }
516
517 return value;
518 }
519
520 static int
521 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
522 {
523 struct usb_composite_dev *cdev = f->config->cdev;
524 struct usb_request *req = cdev->req;
525 int value = -EOPNOTSUPP;
526 u16 w_index = le16_to_cpu(ctrl->wIndex);
527 u16 w_value = le16_to_cpu(ctrl->wValue);
528 u16 w_length = le16_to_cpu(ctrl->wLength);
529
530 /* composite driver infrastructure handles everything; interface
531 * activation uses set_alt().
532 */
533 switch (ctrl->bRequestType) {
534 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
535 value = audio_set_intf_req(f, ctrl);
536 break;
537
538 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
539 value = audio_get_intf_req(f, ctrl);
540 break;
541
542 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
543 value = audio_set_endpoint_req(f, ctrl);
544 break;
545
546 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
547 value = audio_get_endpoint_req(f, ctrl);
548 break;
549
550 default:
551 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
552 ctrl->bRequestType, ctrl->bRequest,
553 w_value, w_index, w_length);
554 }
555
556 /* respond with data transfer or status phase? */
557 if (value >= 0) {
558 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
559 ctrl->bRequestType, ctrl->bRequest,
560 w_value, w_index, w_length);
561 req->zero = 0;
562 req->length = value;
563 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
564 if (value < 0)
565 ERROR(cdev, "audio response on err %d\n", value);
566 }
567
568 /* device either stalls (value < 0) or reports success */
569 return value;
570 }
571
572 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
573 {
574 struct f_audio *audio = func_to_audio(f);
575 struct usb_composite_dev *cdev = f->config->cdev;
576 struct usb_ep *out_ep = audio->out_ep;
577 struct usb_request *req;
578 struct f_uac1_opts *opts;
579 int req_buf_size, req_count, audio_buf_size;
580 int i = 0, err = 0;
581
582 DBG(cdev, "intf %d, alt %d\n", intf, alt);
583
584 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
585 req_buf_size = opts->req_buf_size;
586 req_count = opts->req_count;
587 audio_buf_size = opts->audio_buf_size;
588
589 if (intf == 1) {
590 if (alt == 1) {
591 err = config_ep_by_speed(cdev->gadget, f, out_ep);
592 if (err)
593 return err;
594
595 usb_ep_enable(out_ep);
596 out_ep->driver_data = audio;
597 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
598 if (IS_ERR(audio->copy_buf))
599 return -ENOMEM;
600
601 /*
602 * allocate a bunch of read buffers
603 * and queue them all at once.
604 */
605 for (i = 0; i < req_count && err == 0; i++) {
606 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
607 if (req) {
608 req->buf = kzalloc(req_buf_size,
609 GFP_ATOMIC);
610 if (req->buf) {
611 req->length = req_buf_size;
612 req->context = audio;
613 req->complete =
614 f_audio_complete;
615 err = usb_ep_queue(out_ep,
616 req, GFP_ATOMIC);
617 if (err)
618 ERROR(cdev,
619 "%s queue req: %d\n",
620 out_ep->name, err);
621 } else
622 err = -ENOMEM;
623 } else
624 err = -ENOMEM;
625 }
626
627 } else {
628 struct f_audio_buf *copy_buf = audio->copy_buf;
629 if (copy_buf) {
630 list_add_tail(&copy_buf->list,
631 &audio->play_queue);
632 schedule_work(&audio->playback_work);
633 }
634 }
635 }
636
637 return err;
638 }
639
640 static void f_audio_disable(struct usb_function *f)
641 {
642 return;
643 }
644
645 /*-------------------------------------------------------------------------*/
646
647 static void f_audio_build_desc(struct f_audio *audio)
648 {
649 struct gaudio *card = &audio->card;
650 u8 *sam_freq;
651 int rate;
652
653 /* Set channel numbers */
654 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
655 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
656
657 /* Set sample rates */
658 rate = u_audio_get_playback_rate(card);
659 sam_freq = as_type_i_desc.tSamFreq[0];
660 memcpy(sam_freq, &rate, 3);
661
662 /* Todo: Set Sample bits and other parameters */
663
664 return;
665 }
666
667 /* audio function driver setup/binding */
668 static int
669 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
670 {
671 struct usb_composite_dev *cdev = c->cdev;
672 struct f_audio *audio = func_to_audio(f);
673 struct usb_string *us;
674 int status;
675 struct usb_ep *ep = NULL;
676 struct f_uac1_opts *audio_opts;
677
678 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
679 audio->card.gadget = c->cdev->gadget;
680 /* set up ASLA audio devices */
681 if (!audio_opts->bound) {
682 status = gaudio_setup(&audio->card);
683 if (status < 0)
684 return status;
685 audio_opts->bound = true;
686 }
687 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
688 if (IS_ERR(us))
689 return PTR_ERR(us);
690 ac_interface_desc.iInterface = us[STR_AC_IF].id;
691 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
692 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
693 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
694 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
695 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
696 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
697
698
699 f_audio_build_desc(audio);
700
701 /* allocate instance-specific interface IDs, and patch descriptors */
702 status = usb_interface_id(c, f);
703 if (status < 0)
704 goto fail;
705 ac_interface_desc.bInterfaceNumber = status;
706
707 status = usb_interface_id(c, f);
708 if (status < 0)
709 goto fail;
710 as_interface_alt_0_desc.bInterfaceNumber = status;
711 as_interface_alt_1_desc.bInterfaceNumber = status;
712
713 status = -ENODEV;
714
715 /* allocate instance-specific endpoints */
716 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
717 if (!ep)
718 goto fail;
719 audio->out_ep = ep;
720 audio->out_ep->desc = &as_out_ep_desc;
721 ep->driver_data = cdev; /* claim */
722
723 status = -ENOMEM;
724
725 /* copy descriptors, and track endpoint copies */
726 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL);
727 if (status)
728 goto fail;
729 return 0;
730
731 fail:
732 gaudio_cleanup(&audio->card);
733 if (ep)
734 ep->driver_data = NULL;
735 return status;
736 }
737
738 /*-------------------------------------------------------------------------*/
739
740 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
741 {
742 con->data[cmd] = value;
743
744 return 0;
745 }
746
747 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
748 {
749 return con->data[cmd];
750 }
751
752 /* Todo: add more control selecotor dynamically */
753 static int control_selector_init(struct f_audio *audio)
754 {
755 INIT_LIST_HEAD(&audio->cs);
756 list_add(&feature_unit.list, &audio->cs);
757
758 INIT_LIST_HEAD(&feature_unit.control);
759 list_add(&mute_control.list, &feature_unit.control);
760 list_add(&volume_control.list, &feature_unit.control);
761
762 volume_control.data[UAC__CUR] = 0xffc0;
763 volume_control.data[UAC__MIN] = 0xe3a0;
764 volume_control.data[UAC__MAX] = 0xfff0;
765 volume_control.data[UAC__RES] = 0x0030;
766
767 return 0;
768 }
769
770 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
771 {
772 return container_of(to_config_group(item), struct f_uac1_opts,
773 func_inst.group);
774 }
775
776 CONFIGFS_ATTR_STRUCT(f_uac1_opts);
777 CONFIGFS_ATTR_OPS(f_uac1_opts);
778
779 static void f_uac1_attr_release(struct config_item *item)
780 {
781 struct f_uac1_opts *opts = to_f_uac1_opts(item);
782
783 usb_put_function_instance(&opts->func_inst);
784 }
785
786 static struct configfs_item_operations f_uac1_item_ops = {
787 .release = f_uac1_attr_release,
788 .show_attribute = f_uac1_opts_attr_show,
789 .store_attribute = f_uac1_opts_attr_store,
790 };
791
792 #define UAC1_INT_ATTRIBUTE(name) \
793 static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
794 char *page) \
795 { \
796 int result; \
797 \
798 mutex_lock(&opts->lock); \
799 result = sprintf(page, "%u\n", opts->name); \
800 mutex_unlock(&opts->lock); \
801 \
802 return result; \
803 } \
804 \
805 static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
806 const char *page, size_t len) \
807 { \
808 int ret; \
809 u32 num; \
810 \
811 mutex_lock(&opts->lock); \
812 if (opts->refcnt) { \
813 ret = -EBUSY; \
814 goto end; \
815 } \
816 \
817 ret = kstrtou32(page, 0, &num); \
818 if (ret) \
819 goto end; \
820 \
821 opts->name = num; \
822 ret = len; \
823 \
824 end: \
825 mutex_unlock(&opts->lock); \
826 return ret; \
827 } \
828 \
829 static struct f_uac1_opts_attribute f_uac1_opts_##name = \
830 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
831 f_uac1_opts_##name##_show, \
832 f_uac1_opts_##name##_store)
833
834 UAC1_INT_ATTRIBUTE(req_buf_size);
835 UAC1_INT_ATTRIBUTE(req_count);
836 UAC1_INT_ATTRIBUTE(audio_buf_size);
837
838 #define UAC1_STR_ATTRIBUTE(name) \
839 static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
840 char *page) \
841 { \
842 int result; \
843 \
844 mutex_lock(&opts->lock); \
845 result = sprintf(page, "%s\n", opts->name); \
846 mutex_unlock(&opts->lock); \
847 \
848 return result; \
849 } \
850 \
851 static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
852 const char *page, size_t len) \
853 { \
854 int ret = -EBUSY; \
855 char *tmp; \
856 \
857 mutex_lock(&opts->lock); \
858 if (opts->refcnt) \
859 goto end; \
860 \
861 tmp = kstrndup(page, len, GFP_KERNEL); \
862 if (tmp) { \
863 ret = -ENOMEM; \
864 goto end; \
865 } \
866 if (opts->name##_alloc) \
867 kfree(opts->name); \
868 opts->name##_alloc = true; \
869 opts->name = tmp; \
870 ret = len; \
871 \
872 end: \
873 mutex_unlock(&opts->lock); \
874 return ret; \
875 } \
876 \
877 static struct f_uac1_opts_attribute f_uac1_opts_##name = \
878 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
879 f_uac1_opts_##name##_show, \
880 f_uac1_opts_##name##_store)
881
882 UAC1_STR_ATTRIBUTE(fn_play);
883 UAC1_STR_ATTRIBUTE(fn_cap);
884 UAC1_STR_ATTRIBUTE(fn_cntl);
885
886 static struct configfs_attribute *f_uac1_attrs[] = {
887 &f_uac1_opts_req_buf_size.attr,
888 &f_uac1_opts_req_count.attr,
889 &f_uac1_opts_audio_buf_size.attr,
890 &f_uac1_opts_fn_play.attr,
891 &f_uac1_opts_fn_cap.attr,
892 &f_uac1_opts_fn_cntl.attr,
893 NULL,
894 };
895
896 static struct config_item_type f_uac1_func_type = {
897 .ct_item_ops = &f_uac1_item_ops,
898 .ct_attrs = f_uac1_attrs,
899 .ct_owner = THIS_MODULE,
900 };
901
902 static void f_audio_free_inst(struct usb_function_instance *f)
903 {
904 struct f_uac1_opts *opts;
905
906 opts = container_of(f, struct f_uac1_opts, func_inst);
907 if (opts->fn_play_alloc)
908 kfree(opts->fn_play);
909 if (opts->fn_cap_alloc)
910 kfree(opts->fn_cap);
911 if (opts->fn_cntl_alloc)
912 kfree(opts->fn_cntl);
913 kfree(opts);
914 }
915
916 static struct usb_function_instance *f_audio_alloc_inst(void)
917 {
918 struct f_uac1_opts *opts;
919
920 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
921 if (!opts)
922 return ERR_PTR(-ENOMEM);
923
924 mutex_init(&opts->lock);
925 opts->func_inst.free_func_inst = f_audio_free_inst;
926
927 config_group_init_type_name(&opts->func_inst.group, "",
928 &f_uac1_func_type);
929
930 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
931 opts->req_count = UAC1_REQ_COUNT;
932 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
933 opts->fn_play = FILE_PCM_PLAYBACK;
934 opts->fn_cap = FILE_PCM_CAPTURE;
935 opts->fn_cntl = FILE_CONTROL;
936 return &opts->func_inst;
937 }
938
939 static void f_audio_free(struct usb_function *f)
940 {
941 struct f_audio *audio = func_to_audio(f);
942 struct f_uac1_opts *opts;
943
944 gaudio_cleanup(&audio->card);
945 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
946 kfree(audio);
947 mutex_lock(&opts->lock);
948 --opts->refcnt;
949 mutex_unlock(&opts->lock);
950 }
951
952 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
953 {
954 usb_free_all_descriptors(f);
955 }
956
957 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
958 {
959 struct f_audio *audio;
960 struct f_uac1_opts *opts;
961
962 /* allocate and initialize one new instance */
963 audio = kzalloc(sizeof(*audio), GFP_KERNEL);
964 if (!audio)
965 return ERR_PTR(-ENOMEM);
966
967 audio->card.func.name = "g_audio";
968
969 opts = container_of(fi, struct f_uac1_opts, func_inst);
970 mutex_lock(&opts->lock);
971 ++opts->refcnt;
972 mutex_unlock(&opts->lock);
973 INIT_LIST_HEAD(&audio->play_queue);
974 spin_lock_init(&audio->lock);
975
976 audio->card.func.bind = f_audio_bind;
977 audio->card.func.unbind = f_audio_unbind;
978 audio->card.func.set_alt = f_audio_set_alt;
979 audio->card.func.setup = f_audio_setup;
980 audio->card.func.disable = f_audio_disable;
981 audio->card.func.free_func = f_audio_free;
982
983 control_selector_init(audio);
984
985 INIT_WORK(&audio->playback_work, f_audio_playback_work);
986
987 return &audio->card.func;
988 }
989
990 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
991 MODULE_LICENSE("GPL");
992 MODULE_AUTHOR("Bryan Wu");
Linux with added FPC-III support