?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / usb / gadget / function / f_uac1_legacy.c
blob04f4b286225671fe2c3dcd9b7a368716784a32d9
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * f_audio.c -- USB Audio class function driver
4 *
5 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
6 * Copyright (C) 2008 Analog Devices, Inc
7 *
8 * Enter bugs at http://blackfin.uclinux.org/
9 */
10
11 #include <linux/slab.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/device.h>
15 #include <linux/atomic.h>
16
17 #include "u_uac1_legacy.h"
18
19 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
20 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
21
22 /*
23 * DESCRIPTORS ... most are static, but strings and full
24 * configuration descriptors are built on demand.
25 */
26
27 /*
28 * We have two interfaces- AudioControl and AudioStreaming
29 * TODO: only supcard playback currently
30 */
31 #define F_AUDIO_AC_INTERFACE 0
32 #define F_AUDIO_AS_INTERFACE 1
33 #define F_AUDIO_NUM_INTERFACES 1
34
35 /* B.3.1 Standard AC Interface Descriptor */
36 static struct usb_interface_descriptor ac_interface_desc = {
37 .bLength = USB_DT_INTERFACE_SIZE,
38 .bDescriptorType = USB_DT_INTERFACE,
39 .bNumEndpoints = 0,
40 .bInterfaceClass = USB_CLASS_AUDIO,
41 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
42 };
43
44 /*
45 * The number of AudioStreaming and MIDIStreaming interfaces
46 * in the Audio Interface Collection
47 */
48 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
49
50 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
51 /* 1 input terminal, 1 output terminal and 1 feature unit */
52 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
53 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
54 /* B.3.2 Class-Specific AC Interface Descriptor */
55 static struct uac1_ac_header_descriptor_1 ac_header_desc = {
56 .bLength = UAC_DT_AC_HEADER_LENGTH,
57 .bDescriptorType = USB_DT_CS_INTERFACE,
58 .bDescriptorSubtype = UAC_HEADER,
59 .bcdADC = __constant_cpu_to_le16(0x0100),
60 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
61 .bInCollection = F_AUDIO_NUM_INTERFACES,
62 .baInterfaceNr = {
63 /* Interface number of the first AudioStream interface */
64 [0] = 1,
65 }
66 };
67
68 #define INPUT_TERMINAL_ID 1
69 static struct uac_input_terminal_descriptor input_terminal_desc = {
70 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
71 .bDescriptorType = USB_DT_CS_INTERFACE,
72 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
73 .bTerminalID = INPUT_TERMINAL_ID,
74 .wTerminalType = UAC_TERMINAL_STREAMING,
75 .bAssocTerminal = 0,
76 .wChannelConfig = 0x3,
77 };
78
79 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
80
81 #define FEATURE_UNIT_ID 2
82 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
83 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
84 .bDescriptorType = USB_DT_CS_INTERFACE,
85 .bDescriptorSubtype = UAC_FEATURE_UNIT,
86 .bUnitID = FEATURE_UNIT_ID,
87 .bSourceID = INPUT_TERMINAL_ID,
88 .bControlSize = 2,
89 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
90 };
91
92 static struct usb_audio_control mute_control = {
93 .list = LIST_HEAD_INIT(mute_control.list),
94 .name = "Mute Control",
95 .type = UAC_FU_MUTE,
96 /* Todo: add real Mute control code */
97 .set = generic_set_cmd,
98 .get = generic_get_cmd,
99 };
100
101 static struct usb_audio_control volume_control = {
102 .list = LIST_HEAD_INIT(volume_control.list),
103 .name = "Volume Control",
104 .type = UAC_FU_VOLUME,
105 /* Todo: add real Volume control code */
106 .set = generic_set_cmd,
107 .get = generic_get_cmd,
108 };
109
110 static struct usb_audio_control_selector feature_unit = {
111 .list = LIST_HEAD_INIT(feature_unit.list),
112 .id = FEATURE_UNIT_ID,
113 .name = "Mute & Volume Control",
114 .type = UAC_FEATURE_UNIT,
115 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
116 };
117
118 #define OUTPUT_TERMINAL_ID 3
119 static struct uac1_output_terminal_descriptor output_terminal_desc = {
120 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
121 .bDescriptorType = USB_DT_CS_INTERFACE,
122 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
123 .bTerminalID = OUTPUT_TERMINAL_ID,
124 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
125 .bAssocTerminal = FEATURE_UNIT_ID,
126 .bSourceID = FEATURE_UNIT_ID,
127 };
128
129 /* B.4.1 Standard AS Interface Descriptor */
130 static struct usb_interface_descriptor as_interface_alt_0_desc = {
131 .bLength = USB_DT_INTERFACE_SIZE,
132 .bDescriptorType = USB_DT_INTERFACE,
133 .bAlternateSetting = 0,
134 .bNumEndpoints = 0,
135 .bInterfaceClass = USB_CLASS_AUDIO,
136 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
137 };
138
139 static struct usb_interface_descriptor as_interface_alt_1_desc = {
140 .bLength = USB_DT_INTERFACE_SIZE,
141 .bDescriptorType = USB_DT_INTERFACE,
142 .bAlternateSetting = 1,
143 .bNumEndpoints = 1,
144 .bInterfaceClass = USB_CLASS_AUDIO,
145 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
146 };
147
148 /* B.4.2 Class-Specific AS Interface Descriptor */
149 static struct uac1_as_header_descriptor as_header_desc = {
150 .bLength = UAC_DT_AS_HEADER_SIZE,
151 .bDescriptorType = USB_DT_CS_INTERFACE,
152 .bDescriptorSubtype = UAC_AS_GENERAL,
153 .bTerminalLink = INPUT_TERMINAL_ID,
154 .bDelay = 1,
155 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
156 };
157
158 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
159
160 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
161 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
162 .bDescriptorType = USB_DT_CS_INTERFACE,
163 .bDescriptorSubtype = UAC_FORMAT_TYPE,
164 .bFormatType = UAC_FORMAT_TYPE_I,
165 .bSubframeSize = 2,
166 .bBitResolution = 16,
167 .bSamFreqType = 1,
168 };
169
170 /* Standard ISO OUT Endpoint Descriptor */
171 static struct usb_endpoint_descriptor as_out_ep_desc = {
172 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
173 .bDescriptorType = USB_DT_ENDPOINT,
174 .bEndpointAddress = USB_DIR_OUT,
175 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
176 | USB_ENDPOINT_XFER_ISOC,
177 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
178 .bInterval = 4,
179 };
180
181 /* Class-specific AS ISO OUT Endpoint Descriptor */
182 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
183 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
184 .bDescriptorType = USB_DT_CS_ENDPOINT,
185 .bDescriptorSubtype = UAC_EP_GENERAL,
186 .bmAttributes = 1,
187 .bLockDelayUnits = 1,
188 .wLockDelay = __constant_cpu_to_le16(1),
189 };
190
191 static struct usb_descriptor_header *f_audio_desc[] = {
192 (struct usb_descriptor_header *)&ac_interface_desc,
193 (struct usb_descriptor_header *)&ac_header_desc,
194
195 (struct usb_descriptor_header *)&input_terminal_desc,
196 (struct usb_descriptor_header *)&output_terminal_desc,
197 (struct usb_descriptor_header *)&feature_unit_desc,
198
199 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
200 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
201 (struct usb_descriptor_header *)&as_header_desc,
202
203 (struct usb_descriptor_header *)&as_type_i_desc,
204
205 (struct usb_descriptor_header *)&as_out_ep_desc,
206 (struct usb_descriptor_header *)&as_iso_out_desc,
207 NULL,
208 };
209
210 enum {
211 STR_AC_IF,
212 STR_INPUT_TERMINAL,
213 STR_INPUT_TERMINAL_CH_NAMES,
214 STR_FEAT_DESC_0,
215 STR_OUTPUT_TERMINAL,
216 STR_AS_IF_ALT0,
217 STR_AS_IF_ALT1,
218 };
219
220 static struct usb_string strings_uac1[] = {
221 [STR_AC_IF].s = "AC Interface",
222 [STR_INPUT_TERMINAL].s = "Input terminal",
223 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
224 [STR_FEAT_DESC_0].s = "Volume control & mute",
225 [STR_OUTPUT_TERMINAL].s = "Output terminal",
226 [STR_AS_IF_ALT0].s = "AS Interface",
227 [STR_AS_IF_ALT1].s = "AS Interface",
228 { },
229 };
230
231 static struct usb_gadget_strings str_uac1 = {
232 .language = 0x0409, /* en-us */
233 .strings = strings_uac1,
234 };
235
236 static struct usb_gadget_strings *uac1_strings[] = {
237 &str_uac1,
238 NULL,
239 };
240
241 /*
242 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
243 */
244
245 /*-------------------------------------------------------------------------*/
246 struct f_audio_buf {
247 u8 *buf;
248 int actual;
249 struct list_head list;
250 };
251
252 static 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)
258 return ERR_PTR(-ENOMEM);
259
260 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
261 if (!copy_buf->buf) {
262 kfree(copy_buf);
263 return ERR_PTR(-ENOMEM);
264 }
265
266 return copy_buf;
267 }
268
269 static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
270 {
271 kfree(audio_buf->buf);
272 kfree(audio_buf);
273 }
274 /*-------------------------------------------------------------------------*/
275
276 struct f_audio {
277 struct gaudio card;
278
279 u8 ac_intf, ac_alt;
280 u8 as_intf, as_alt;
281
282 /* endpoints handle full and/or high speeds */
283 struct usb_ep *out_ep;
284
285 spinlock_t lock;
286 struct f_audio_buf *copy_buf;
287 struct work_struct playback_work;
288 struct list_head play_queue;
289
290 /* Control Set command */
291 struct list_head cs;
292 u8 set_cmd;
293 struct usb_audio_control *set_con;
294 };
295
296 static inline struct f_audio *func_to_audio(struct usb_function *f)
297 {
298 return container_of(f, struct f_audio, card.func);
299 }
300
301 /*-------------------------------------------------------------------------*/
302
303 static void f_audio_playback_work(struct work_struct *data)
304 {
305 struct f_audio *audio = container_of(data, struct f_audio,
306 playback_work);
307 struct f_audio_buf *play_buf;
308
309 spin_lock_irq(&audio->lock);
310 if (list_empty(&audio->play_queue)) {
311 spin_unlock_irq(&audio->lock);
312 return;
313 }
314 play_buf = list_first_entry(&audio->play_queue,
315 struct f_audio_buf, list);
316 list_del(&play_buf->list);
317 spin_unlock_irq(&audio->lock);
318
319 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
320 f_audio_buffer_free(play_buf);
321 }
322
323 static 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 struct f_uac1_legacy_opts *opts;
329 int audio_buf_size;
330 int err;
331
332 opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts,
333 func_inst);
334 audio_buf_size = opts->audio_buf_size;
335
336 if (!copy_buf)
337 return -EINVAL;
338
339 /* Copy buffer is full, add it to the play_queue */
340 if (audio_buf_size - copy_buf->actual < req->actual) {
341 list_add_tail(&copy_buf->list, &audio->play_queue);
342 schedule_work(&audio->playback_work);
343 copy_buf = f_audio_buffer_alloc(audio_buf_size);
344 if (IS_ERR(copy_buf))
345 return -ENOMEM;
346 }
347
348 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
349 copy_buf->actual += req->actual;
350 audio->copy_buf = copy_buf;
351
352 err = usb_ep_queue(ep, req, GFP_ATOMIC);
353 if (err)
354 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
355
356 return 0;
357
358 }
359
360 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
361 {
362 struct f_audio *audio = req->context;
363 int status = req->status;
364 u32 data = 0;
365 struct usb_ep *out_ep = audio->out_ep;
366
367 switch (status) {
368
369 case 0: /* normal completion? */
370 if (ep == out_ep)
371 f_audio_out_ep_complete(ep, req);
372 else if (audio->set_con) {
373 memcpy(&data, req->buf, req->length);
374 audio->set_con->set(audio->set_con, audio->set_cmd,
375 le16_to_cpu(data));
376 audio->set_con = NULL;
377 }
378 break;
379 default:
380 break;
381 }
382 }
383
384 static int audio_set_intf_req(struct usb_function *f,
385 const struct usb_ctrlrequest *ctrl)
386 {
387 struct f_audio *audio = func_to_audio(f);
388 struct usb_composite_dev *cdev = f->config->cdev;
389 struct usb_request *req = cdev->req;
390 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
391 u16 len = le16_to_cpu(ctrl->wLength);
392 u16 w_value = le16_to_cpu(ctrl->wValue);
393 u8 con_sel = (w_value >> 8) & 0xFF;
394 u8 cmd = (ctrl->bRequest & 0x0F);
395 struct usb_audio_control_selector *cs;
396 struct usb_audio_control *con;
397
398 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
399 ctrl->bRequest, w_value, len, id);
400
401 list_for_each_entry(cs, &audio->cs, list) {
402 if (cs->id == id) {
403 list_for_each_entry(con, &cs->control, list) {
404 if (con->type == con_sel) {
405 audio->set_con = con;
406 break;
407 }
408 }
409 break;
410 }
411 }
412
413 audio->set_cmd = cmd;
414 req->context = audio;
415 req->complete = f_audio_complete;
416
417 return len;
418 }
419
420 static int audio_get_intf_req(struct usb_function *f,
421 const struct usb_ctrlrequest *ctrl)
422 {
423 struct f_audio *audio = func_to_audio(f);
424 struct usb_composite_dev *cdev = f->config->cdev;
425 struct usb_request *req = cdev->req;
426 int value = -EOPNOTSUPP;
427 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
428 u16 len = le16_to_cpu(ctrl->wLength);
429 u16 w_value = le16_to_cpu(ctrl->wValue);
430 u8 con_sel = (w_value >> 8) & 0xFF;
431 u8 cmd = (ctrl->bRequest & 0x0F);
432 struct usb_audio_control_selector *cs;
433 struct usb_audio_control *con;
434
435 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
436 ctrl->bRequest, w_value, len, id);
437
438 list_for_each_entry(cs, &audio->cs, list) {
439 if (cs->id == id) {
440 list_for_each_entry(con, &cs->control, list) {
441 if (con->type == con_sel && con->get) {
442 value = con->get(con, cmd);
443 break;
444 }
445 }
446 break;
447 }
448 }
449
450 req->context = audio;
451 req->complete = f_audio_complete;
452 len = min_t(size_t, sizeof(value), len);
453 memcpy(req->buf, &value, len);
454
455 return len;
456 }
457
458 static int audio_set_endpoint_req(struct usb_function *f,
459 const struct usb_ctrlrequest *ctrl)
460 {
461 struct usb_composite_dev *cdev = f->config->cdev;
462 int value = -EOPNOTSUPP;
463 u16 ep = le16_to_cpu(ctrl->wIndex);
464 u16 len = le16_to_cpu(ctrl->wLength);
465 u16 w_value = le16_to_cpu(ctrl->wValue);
466
467 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
468 ctrl->bRequest, w_value, len, ep);
469
470 switch (ctrl->bRequest) {
471 case UAC_SET_CUR:
472 value = len;
473 break;
474
475 case UAC_SET_MIN:
476 break;
477
478 case UAC_SET_MAX:
479 break;
480
481 case UAC_SET_RES:
482 break;
483
484 case UAC_SET_MEM:
485 break;
486
487 default:
488 break;
489 }
490
491 return value;
492 }
493
494 static int audio_get_endpoint_req(struct usb_function *f,
495 const struct usb_ctrlrequest *ctrl)
496 {
497 struct usb_composite_dev *cdev = f->config->cdev;
498 int value = -EOPNOTSUPP;
499 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
500 u16 len = le16_to_cpu(ctrl->wLength);
501 u16 w_value = le16_to_cpu(ctrl->wValue);
502
503 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
504 ctrl->bRequest, w_value, len, ep);
505
506 switch (ctrl->bRequest) {
507 case UAC_GET_CUR:
508 case UAC_GET_MIN:
509 case UAC_GET_MAX:
510 case UAC_GET_RES:
511 value = len;
512 break;
513 case UAC_GET_MEM:
514 break;
515 default:
516 break;
517 }
518
519 return value;
520 }
521
522 static int
523 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
524 {
525 struct usb_composite_dev *cdev = f->config->cdev;
526 struct usb_request *req = cdev->req;
527 int value = -EOPNOTSUPP;
528 u16 w_index = le16_to_cpu(ctrl->wIndex);
529 u16 w_value = le16_to_cpu(ctrl->wValue);
530 u16 w_length = le16_to_cpu(ctrl->wLength);
531
532 /* composite driver infrastructure handles everything; interface
533 * activation uses set_alt().
534 */
535 switch (ctrl->bRequestType) {
536 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
537 value = audio_set_intf_req(f, ctrl);
538 break;
539
540 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
541 value = audio_get_intf_req(f, ctrl);
542 break;
543
544 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
545 value = audio_set_endpoint_req(f, ctrl);
546 break;
547
548 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
549 value = audio_get_endpoint_req(f, ctrl);
550 break;
551
552 default:
553 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
554 ctrl->bRequestType, ctrl->bRequest,
555 w_value, w_index, w_length);
556 }
557
558 /* respond with data transfer or status phase? */
559 if (value >= 0) {
560 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
561 ctrl->bRequestType, ctrl->bRequest,
562 w_value, w_index, w_length);
563 req->zero = 0;
564 req->length = value;
565 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
566 if (value < 0)
567 ERROR(cdev, "audio response on err %d\n", value);
568 }
569
570 /* device either stalls (value < 0) or reports success */
571 return value;
572 }
573
574 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
575 {
576 struct f_audio *audio = func_to_audio(f);
577 struct usb_composite_dev *cdev = f->config->cdev;
578 struct usb_ep *out_ep = audio->out_ep;
579 struct usb_request *req;
580 struct f_uac1_legacy_opts *opts;
581 int req_buf_size, req_count, audio_buf_size;
582 int i = 0, err = 0;
583
584 DBG(cdev, "intf %d, alt %d\n", intf, alt);
585
586 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
587 req_buf_size = opts->req_buf_size;
588 req_count = opts->req_count;
589 audio_buf_size = opts->audio_buf_size;
590
591 /* No i/f has more than 2 alt settings */
592 if (alt > 1) {
593 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
594 return -EINVAL;
595 }
596
597 if (intf == audio->ac_intf) {
598 /* Control I/f has only 1 AltSetting - 0 */
599 if (alt) {
600 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
601 return -EINVAL;
602 }
603 return 0;
604 } else if (intf == audio->as_intf) {
605 if (alt == 1) {
606 err = config_ep_by_speed(cdev->gadget, f, out_ep);
607 if (err)
608 return err;
609
610 usb_ep_enable(out_ep);
611 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
612 if (IS_ERR(audio->copy_buf))
613 return -ENOMEM;
614
615 /*
616 * allocate a bunch of read buffers
617 * and queue them all at once.
618 */
619 for (i = 0; i < req_count && err == 0; i++) {
620 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
621 if (req) {
622 req->buf = kzalloc(req_buf_size,
623 GFP_ATOMIC);
624 if (req->buf) {
625 req->length = req_buf_size;
626 req->context = audio;
627 req->complete =
628 f_audio_complete;
629 err = usb_ep_queue(out_ep,
630 req, GFP_ATOMIC);
631 if (err)
632 ERROR(cdev,
633 "%s queue req: %d\n",
634 out_ep->name, err);
635 } else
636 err = -ENOMEM;
637 } else
638 err = -ENOMEM;
639 }
640
641 } else {
642 struct f_audio_buf *copy_buf = audio->copy_buf;
643 if (copy_buf) {
644 list_add_tail(&copy_buf->list,
645 &audio->play_queue);
646 schedule_work(&audio->playback_work);
647 }
648 }
649 audio->as_alt = alt;
650 }
651
652 return err;
653 }
654
655 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
656 {
657 struct f_audio *audio = func_to_audio(f);
658 struct usb_composite_dev *cdev = f->config->cdev;
659
660 if (intf == audio->ac_intf)
661 return audio->ac_alt;
662 else if (intf == audio->as_intf)
663 return audio->as_alt;
664 else
665 ERROR(cdev, "%s:%d Invalid Interface %d!\n",
666 __func__, __LINE__, intf);
667
668 return -EINVAL;
669 }
670
671 static void f_audio_disable(struct usb_function *f)
672 {
673 return;
674 }
675
676 /*-------------------------------------------------------------------------*/
677
678 static void f_audio_build_desc(struct f_audio *audio)
679 {
680 struct gaudio *card = &audio->card;
681 u8 *sam_freq;
682 int rate;
683
684 /* Set channel numbers */
685 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
686 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
687
688 /* Set sample rates */
689 rate = u_audio_get_playback_rate(card);
690 sam_freq = as_type_i_desc.tSamFreq[0];
691 memcpy(sam_freq, &rate, 3);
692
693 /* Todo: Set Sample bits and other parameters */
694
695 return;
696 }
697
698 /* audio function driver setup/binding */
699 static int
700 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
701 {
702 struct usb_composite_dev *cdev = c->cdev;
703 struct f_audio *audio = func_to_audio(f);
704 struct usb_string *us;
705 int status;
706 struct usb_ep *ep = NULL;
707 struct f_uac1_legacy_opts *audio_opts;
708
709 audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
710 audio->card.gadget = c->cdev->gadget;
711 /* set up ASLA audio devices */
712 if (!audio_opts->bound) {
713 status = gaudio_setup(&audio->card);
714 if (status < 0)
715 return status;
716 audio_opts->bound = true;
717 }
718 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
719 if (IS_ERR(us))
720 return PTR_ERR(us);
721 ac_interface_desc.iInterface = us[STR_AC_IF].id;
722 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
723 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
724 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
725 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
726 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
727 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
728
729
730 f_audio_build_desc(audio);
731
732 /* allocate instance-specific interface IDs, and patch descriptors */
733 status = usb_interface_id(c, f);
734 if (status < 0)
735 goto fail;
736 ac_interface_desc.bInterfaceNumber = status;
737 audio->ac_intf = status;
738 audio->ac_alt = 0;
739
740 status = usb_interface_id(c, f);
741 if (status < 0)
742 goto fail;
743 as_interface_alt_0_desc.bInterfaceNumber = status;
744 as_interface_alt_1_desc.bInterfaceNumber = status;
745 audio->as_intf = status;
746 audio->as_alt = 0;
747
748 status = -ENODEV;
749
750 /* allocate instance-specific endpoints */
751 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
752 if (!ep)
753 goto fail;
754 audio->out_ep = ep;
755 audio->out_ep->desc = &as_out_ep_desc;
756
757 status = -ENOMEM;
758
759 /* copy descriptors, and track endpoint copies */
760 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
761 NULL);
762 if (status)
763 goto fail;
764 return 0;
765
766 fail:
767 gaudio_cleanup(&audio->card);
768 return status;
769 }
770
771 /*-------------------------------------------------------------------------*/
772
773 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
774 {
775 con->data[cmd] = value;
776
777 return 0;
778 }
779
780 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
781 {
782 return con->data[cmd];
783 }
784
785 /* Todo: add more control selecotor dynamically */
786 static int control_selector_init(struct f_audio *audio)
787 {
788 INIT_LIST_HEAD(&audio->cs);
789 list_add(&feature_unit.list, &audio->cs);
790
791 INIT_LIST_HEAD(&feature_unit.control);
792 list_add(&mute_control.list, &feature_unit.control);
793 list_add(&volume_control.list, &feature_unit.control);
794
795 volume_control.data[UAC__CUR] = 0xffc0;
796 volume_control.data[UAC__MIN] = 0xe3a0;
797 volume_control.data[UAC__MAX] = 0xfff0;
798 volume_control.data[UAC__RES] = 0x0030;
799
800 return 0;
801 }
802
803 static inline
804 struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item)
805 {
806 return container_of(to_config_group(item), struct f_uac1_legacy_opts,
807 func_inst.group);
808 }
809
810 static void f_uac1_attr_release(struct config_item *item)
811 {
812 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item);
813
814 usb_put_function_instance(&opts->func_inst);
815 }
816
817 static struct configfs_item_operations f_uac1_item_ops = {
818 .release = f_uac1_attr_release,
819 };
820
821 #define UAC1_INT_ATTRIBUTE(name) \
822 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
823 char *page) \
824 { \
825 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
826 int result; \
827 \
828 mutex_lock(&opts->lock); \
829 result = sprintf(page, "%u\n", opts->name); \
830 mutex_unlock(&opts->lock); \
831 \
832 return result; \
833 } \
834 \
835 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
836 const char *page, size_t len) \
837 { \
838 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
839 int ret; \
840 u32 num; \
841 \
842 mutex_lock(&opts->lock); \
843 if (opts->refcnt) { \
844 ret = -EBUSY; \
845 goto end; \
846 } \
847 \
848 ret = kstrtou32(page, 0, &num); \
849 if (ret) \
850 goto end; \
851 \
852 opts->name = num; \
853 ret = len; \
854 \
855 end: \
856 mutex_unlock(&opts->lock); \
857 return ret; \
858 } \
859 \
860 CONFIGFS_ATTR(f_uac1_opts_, name)
861
862 UAC1_INT_ATTRIBUTE(req_buf_size);
863 UAC1_INT_ATTRIBUTE(req_count);
864 UAC1_INT_ATTRIBUTE(audio_buf_size);
865
866 #define UAC1_STR_ATTRIBUTE(name) \
867 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
868 char *page) \
869 { \
870 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
871 int result; \
872 \
873 mutex_lock(&opts->lock); \
874 result = sprintf(page, "%s\n", opts->name); \
875 mutex_unlock(&opts->lock); \
876 \
877 return result; \
878 } \
879 \
880 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
881 const char *page, size_t len) \
882 { \
883 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
884 int ret = -EBUSY; \
885 char *tmp; \
886 \
887 mutex_lock(&opts->lock); \
888 if (opts->refcnt) \
889 goto end; \
890 \
891 tmp = kstrndup(page, len, GFP_KERNEL); \
892 if (tmp) { \
893 ret = -ENOMEM; \
894 goto end; \
895 } \
896 if (opts->name##_alloc) \
897 kfree(opts->name); \
898 opts->name##_alloc = true; \
899 opts->name = tmp; \
900 ret = len; \
901 \
902 end: \
903 mutex_unlock(&opts->lock); \
904 return ret; \
905 } \
906 \
907 CONFIGFS_ATTR(f_uac1_opts_, name)
908
909 UAC1_STR_ATTRIBUTE(fn_play);
910 UAC1_STR_ATTRIBUTE(fn_cap);
911 UAC1_STR_ATTRIBUTE(fn_cntl);
912
913 static struct configfs_attribute *f_uac1_attrs[] = {
914 &f_uac1_opts_attr_req_buf_size,
915 &f_uac1_opts_attr_req_count,
916 &f_uac1_opts_attr_audio_buf_size,
917 &f_uac1_opts_attr_fn_play,
918 &f_uac1_opts_attr_fn_cap,
919 &f_uac1_opts_attr_fn_cntl,
920 NULL,
921 };
922
923 static const struct config_item_type f_uac1_func_type = {
924 .ct_item_ops = &f_uac1_item_ops,
925 .ct_attrs = f_uac1_attrs,
926 .ct_owner = THIS_MODULE,
927 };
928
929 static void f_audio_free_inst(struct usb_function_instance *f)
930 {
931 struct f_uac1_legacy_opts *opts;
932
933 opts = container_of(f, struct f_uac1_legacy_opts, func_inst);
934 if (opts->fn_play_alloc)
935 kfree(opts->fn_play);
936 if (opts->fn_cap_alloc)
937 kfree(opts->fn_cap);
938 if (opts->fn_cntl_alloc)
939 kfree(opts->fn_cntl);
940 kfree(opts);
941 }
942
943 static struct usb_function_instance *f_audio_alloc_inst(void)
944 {
945 struct f_uac1_legacy_opts *opts;
946
947 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
948 if (!opts)
949 return ERR_PTR(-ENOMEM);
950
951 mutex_init(&opts->lock);
952 opts->func_inst.free_func_inst = f_audio_free_inst;
953
954 config_group_init_type_name(&opts->func_inst.group, "",
955 &f_uac1_func_type);
956
957 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
958 opts->req_count = UAC1_REQ_COUNT;
959 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
960 opts->fn_play = FILE_PCM_PLAYBACK;
961 opts->fn_cap = FILE_PCM_CAPTURE;
962 opts->fn_cntl = FILE_CONTROL;
963 return &opts->func_inst;
964 }
965
966 static void f_audio_free(struct usb_function *f)
967 {
968 struct f_audio *audio = func_to_audio(f);
969 struct f_uac1_legacy_opts *opts;
970
971 gaudio_cleanup(&audio->card);
972 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
973 kfree(audio);
974 mutex_lock(&opts->lock);
975 --opts->refcnt;
976 mutex_unlock(&opts->lock);
977 }
978
979 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
980 {
981 usb_free_all_descriptors(f);
982 }
983
984 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
985 {
986 struct f_audio *audio;
987 struct f_uac1_legacy_opts *opts;
988
989 /* allocate and initialize one new instance */
990 audio = kzalloc(sizeof(*audio), GFP_KERNEL);
991 if (!audio)
992 return ERR_PTR(-ENOMEM);
993
994 audio->card.func.name = "g_audio";
995
996 opts = container_of(fi, struct f_uac1_legacy_opts, func_inst);
997 mutex_lock(&opts->lock);
998 ++opts->refcnt;
999 mutex_unlock(&opts->lock);
1000 INIT_LIST_HEAD(&audio->play_queue);
1001 spin_lock_init(&audio->lock);
1002
1003 audio->card.func.bind = f_audio_bind;
1004 audio->card.func.unbind = f_audio_unbind;
1005 audio->card.func.set_alt = f_audio_set_alt;
1006 audio->card.func.get_alt = f_audio_get_alt;
1007 audio->card.func.setup = f_audio_setup;
1008 audio->card.func.disable = f_audio_disable;
1009 audio->card.func.free_func = f_audio_free;
1010
1011 control_selector_init(audio);
1012
1013 INIT_WORK(&audio->playback_work, f_audio_playback_work);
1014
1015 return &audio->card.func;
1016 }
1017
1018 DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc);
1019 MODULE_LICENSE("GPL");
1020 MODULE_AUTHOR("Bryan Wu");
CRIS linux kernel tree