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/device.h>
15 #include <linux/atomic.h>
16
17 #include "u_audio.h"
18
19 #define OUT_EP_MAX_PACKET_SIZE 200
20 static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
21 module_param(req_buf_size, int, S_IRUGO);
22 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
23
24 static int req_count = 256;
25 module_param(req_count, int, S_IRUGO);
26 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
27
28 static int audio_buf_size = 48000;
29 module_param(audio_buf_size, int, S_IRUGO);
30 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
31
32 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
33 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
34
35 /*
36 * DESCRIPTORS ... most are static, but strings and full
37 * configuration descriptors are built on demand.
38 */
39
40 /*
41 * We have two interfaces- AudioControl and AudioStreaming
42 * TODO: only supcard playback currently
43 */
44 #define F_AUDIO_AC_INTERFACE 0
45 #define F_AUDIO_AS_INTERFACE 1
46 #define F_AUDIO_NUM_INTERFACES 2
47
48 /* B.3.1 Standard AC Interface Descriptor */
49 static struct usb_interface_descriptor ac_interface_desc __initdata = {
50 .bLength = USB_DT_INTERFACE_SIZE,
51 .bDescriptorType = USB_DT_INTERFACE,
52 .bNumEndpoints = 0,
53 .bInterfaceClass = USB_CLASS_AUDIO,
54 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
55 };
56
57 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
58
59 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
60 /* 1 input terminal, 1 output terminal and 1 feature unit */
61 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
62 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
63 /* B.3.2 Class-Specific AC Interface Descriptor */
64 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
65 .bLength = UAC_DT_AC_HEADER_LENGTH,
66 .bDescriptorType = USB_DT_CS_INTERFACE,
67 .bDescriptorSubtype = UAC_HEADER,
68 .bcdADC = __constant_cpu_to_le16(0x0100),
69 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
70 .bInCollection = F_AUDIO_NUM_INTERFACES,
71 .baInterfaceNr = {
72 [0] = F_AUDIO_AC_INTERFACE,
73 [1] = F_AUDIO_AS_INTERFACE,
74 }
75 };
76
77 #define INPUT_TERMINAL_ID 1
78 static struct uac_input_terminal_descriptor input_terminal_desc = {
79 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
80 .bDescriptorType = USB_DT_CS_INTERFACE,
81 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
82 .bTerminalID = INPUT_TERMINAL_ID,
83 .wTerminalType = UAC_TERMINAL_STREAMING,
84 .bAssocTerminal = 0,
85 .wChannelConfig = 0x3,
86 };
87
88 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
89
90 #define FEATURE_UNIT_ID 2
91 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
92 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
93 .bDescriptorType = USB_DT_CS_INTERFACE,
94 .bDescriptorSubtype = UAC_FEATURE_UNIT,
95 .bUnitID = FEATURE_UNIT_ID,
96 .bSourceID = INPUT_TERMINAL_ID,
97 .bControlSize = 2,
98 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
99 };
100
101 static struct usb_audio_control mute_control = {
102 .list = LIST_HEAD_INIT(mute_control.list),
103 .name = "Mute Control",
104 .type = UAC_FU_MUTE,
105 /* Todo: add real Mute control code */
106 .set = generic_set_cmd,
107 .get = generic_get_cmd,
108 };
109
110 static struct usb_audio_control volume_control = {
111 .list = LIST_HEAD_INIT(volume_control.list),
112 .name = "Volume Control",
113 .type = UAC_FU_VOLUME,
114 /* Todo: add real Volume control code */
115 .set = generic_set_cmd,
116 .get = generic_get_cmd,
117 };
118
119 static struct usb_audio_control_selector feature_unit = {
120 .list = LIST_HEAD_INIT(feature_unit.list),
121 .id = FEATURE_UNIT_ID,
122 .name = "Mute & Volume Control",
123 .type = UAC_FEATURE_UNIT,
124 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
125 };
126
127 #define OUTPUT_TERMINAL_ID 3
128 static struct uac1_output_terminal_descriptor output_terminal_desc = {
129 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
130 .bDescriptorType = USB_DT_CS_INTERFACE,
131 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
132 .bTerminalID = OUTPUT_TERMINAL_ID,
133 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
134 .bAssocTerminal = FEATURE_UNIT_ID,
135 .bSourceID = FEATURE_UNIT_ID,
136 };
137
138 /* B.4.1 Standard AS Interface Descriptor */
139 static struct usb_interface_descriptor as_interface_alt_0_desc = {
140 .bLength = USB_DT_INTERFACE_SIZE,
141 .bDescriptorType = USB_DT_INTERFACE,
142 .bAlternateSetting = 0,
143 .bNumEndpoints = 0,
144 .bInterfaceClass = USB_CLASS_AUDIO,
145 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
146 };
147
148 static struct usb_interface_descriptor as_interface_alt_1_desc = {
149 .bLength = USB_DT_INTERFACE_SIZE,
150 .bDescriptorType = USB_DT_INTERFACE,
151 .bAlternateSetting = 1,
152 .bNumEndpoints = 1,
153 .bInterfaceClass = USB_CLASS_AUDIO,
154 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
155 };
156
157 /* B.4.2 Class-Specific AS Interface Descriptor */
158 static struct uac1_as_header_descriptor as_header_desc = {
159 .bLength = UAC_DT_AS_HEADER_SIZE,
160 .bDescriptorType = USB_DT_CS_INTERFACE,
161 .bDescriptorSubtype = UAC_AS_GENERAL,
162 .bTerminalLink = INPUT_TERMINAL_ID,
163 .bDelay = 1,
164 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
165 };
166
167 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
168
169 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
170 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
171 .bDescriptorType = USB_DT_CS_INTERFACE,
172 .bDescriptorSubtype = UAC_FORMAT_TYPE,
173 .bFormatType = UAC_FORMAT_TYPE_I,
174 .bSubframeSize = 2,
175 .bBitResolution = 16,
176 .bSamFreqType = 1,
177 };
178
179 /* Standard ISO OUT Endpoint Descriptor */
180 static struct usb_endpoint_descriptor as_out_ep_desc = {
181 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
182 .bDescriptorType = USB_DT_ENDPOINT,
183 .bEndpointAddress = USB_DIR_OUT,
184 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
185 | USB_ENDPOINT_XFER_ISOC,
186 .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
187 .bInterval = 4,
188 };
189
190 /* Class-specific AS ISO OUT Endpoint Descriptor */
191 static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
192 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
193 .bDescriptorType = USB_DT_CS_ENDPOINT,
194 .bDescriptorSubtype = UAC_EP_GENERAL,
195 .bmAttributes = 1,
196 .bLockDelayUnits = 1,
197 .wLockDelay = __constant_cpu_to_le16(1),
198 };
199
200 static struct usb_descriptor_header *f_audio_desc[] __initdata = {
201 (struct usb_descriptor_header *)&ac_interface_desc,
202 (struct usb_descriptor_header *)&ac_header_desc,
203
204 (struct usb_descriptor_header *)&input_terminal_desc,
205 (struct usb_descriptor_header *)&output_terminal_desc,
206 (struct usb_descriptor_header *)&feature_unit_desc,
207
208 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
209 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
210 (struct usb_descriptor_header *)&as_header_desc,
211
212 (struct usb_descriptor_header *)&as_type_i_desc,
213
214 (struct usb_descriptor_header *)&as_out_ep_desc,
215 (struct usb_descriptor_header *)&as_iso_out_desc,
216 NULL,
217 };
218
219 /* string IDs are assigned dynamically */
220
221 #define STRING_MANUFACTURER_IDX 0
222 #define STRING_PRODUCT_IDX 1
223
224 static char manufacturer[50];
225
226 static struct usb_string strings_dev[] = {
227 [STRING_MANUFACTURER_IDX].s = manufacturer,
228 [STRING_PRODUCT_IDX].s = DRIVER_DESC,
229 { } /* end of list */
230 };
231
232 static struct usb_gadget_strings stringtab_dev = {
233 .language = 0x0409, /* en-us */
234 .strings = strings_dev,
235 };
236
237 static struct usb_gadget_strings *audio_strings[] = {
238 &stringtab_dev,
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
f_audio_buffer_alloc(int buf_size)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
f_audio_buffer_free(struct f_audio_buf * audio_buf)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
func_to_audio(struct usb_function * f)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
f_audio_playback_work(struct work_struct * data)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
f_audio_out_ep_complete(struct usb_ep * ep,struct usb_request * req)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 int err;
327
328 if (!copy_buf)
329 return -EINVAL;
330
331 /* Copy buffer is full, add it to the play_queue */
332 if (audio_buf_size - copy_buf->actual < req->actual) {
333 list_add_tail(©_buf->list, &audio->play_queue);
334 schedule_work(&audio->playback_work);
335 copy_buf = f_audio_buffer_alloc(audio_buf_size);
336 if (IS_ERR(copy_buf))
337 return -ENOMEM;
338 }
339
340 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
341 copy_buf->actual += req->actual;
342 audio->copy_buf = copy_buf;
343
344 err = usb_ep_queue(ep, req, GFP_ATOMIC);
345 if (err)
346 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
347
348 return 0;
349
350 }
351
f_audio_complete(struct usb_ep * ep,struct usb_request * req)352 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
353 {
354 struct f_audio *audio = req->context;
355 int status = req->status;
356 u32 data = 0;
357 struct usb_ep *out_ep = audio->out_ep;
358
359 switch (status) {
360
361 case 0: /* normal completion? */
362 if (ep == out_ep)
363 f_audio_out_ep_complete(ep, req);
364 else if (audio->set_con) {
365 memcpy(&data, req->buf, req->length);
366 audio->set_con->set(audio->set_con, audio->set_cmd,
367 le16_to_cpu(data));
368 audio->set_con = NULL;
369 }
370 break;
371 default:
372 break;
373 }
374 }
375
audio_set_intf_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)376 static int audio_set_intf_req(struct usb_function *f,
377 const struct usb_ctrlrequest *ctrl)
378 {
379 struct f_audio *audio = func_to_audio(f);
380 struct usb_composite_dev *cdev = f->config->cdev;
381 struct usb_request *req = cdev->req;
382 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
383 u16 len = le16_to_cpu(ctrl->wLength);
384 u16 w_value = le16_to_cpu(ctrl->wValue);
385 u8 con_sel = (w_value >> 8) & 0xFF;
386 u8 cmd = (ctrl->bRequest & 0x0F);
387 struct usb_audio_control_selector *cs;
388 struct usb_audio_control *con;
389
390 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
391 ctrl->bRequest, w_value, len, id);
392
393 list_for_each_entry(cs, &audio->cs, list) {
394 if (cs->id == id) {
395 list_for_each_entry(con, &cs->control, list) {
396 if (con->type == con_sel) {
397 audio->set_con = con;
398 break;
399 }
400 }
401 break;
402 }
403 }
404
405 audio->set_cmd = cmd;
406 req->context = audio;
407 req->complete = f_audio_complete;
408
409 return len;
410 }
411
audio_get_intf_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)412 static int audio_get_intf_req(struct usb_function *f,
413 const struct usb_ctrlrequest *ctrl)
414 {
415 struct f_audio *audio = func_to_audio(f);
416 struct usb_composite_dev *cdev = f->config->cdev;
417 struct usb_request *req = cdev->req;
418 int value = -EOPNOTSUPP;
419 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
420 u16 len = le16_to_cpu(ctrl->wLength);
421 u16 w_value = le16_to_cpu(ctrl->wValue);
422 u8 con_sel = (w_value >> 8) & 0xFF;
423 u8 cmd = (ctrl->bRequest & 0x0F);
424 struct usb_audio_control_selector *cs;
425 struct usb_audio_control *con;
426
427 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
428 ctrl->bRequest, w_value, len, id);
429
430 list_for_each_entry(cs, &audio->cs, list) {
431 if (cs->id == id) {
432 list_for_each_entry(con, &cs->control, list) {
433 if (con->type == con_sel && con->get) {
434 value = con->get(con, cmd);
435 break;
436 }
437 }
438 break;
439 }
440 }
441
442 req->context = audio;
443 req->complete = f_audio_complete;
444 memcpy(req->buf, &value, len);
445
446 return len;
447 }
448
audio_set_endpoint_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)449 static int audio_set_endpoint_req(struct usb_function *f,
450 const struct usb_ctrlrequest *ctrl)
451 {
452 struct usb_composite_dev *cdev = f->config->cdev;
453 int value = -EOPNOTSUPP;
454 u16 ep = le16_to_cpu(ctrl->wIndex);
455 u16 len = le16_to_cpu(ctrl->wLength);
456 u16 w_value = le16_to_cpu(ctrl->wValue);
457
458 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
459 ctrl->bRequest, w_value, len, ep);
460
461 switch (ctrl->bRequest) {
462 case UAC_SET_CUR:
463 value = len;
464 break;
465
466 case UAC_SET_MIN:
467 break;
468
469 case UAC_SET_MAX:
470 break;
471
472 case UAC_SET_RES:
473 break;
474
475 case UAC_SET_MEM:
476 break;
477
478 default:
479 break;
480 }
481
482 return value;
483 }
484
audio_get_endpoint_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)485 static int audio_get_endpoint_req(struct usb_function *f,
486 const struct usb_ctrlrequest *ctrl)
487 {
488 struct usb_composite_dev *cdev = f->config->cdev;
489 int value = -EOPNOTSUPP;
490 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
491 u16 len = le16_to_cpu(ctrl->wLength);
492 u16 w_value = le16_to_cpu(ctrl->wValue);
493
494 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
495 ctrl->bRequest, w_value, len, ep);
496
497 switch (ctrl->bRequest) {
498 case UAC_GET_CUR:
499 case UAC_GET_MIN:
500 case UAC_GET_MAX:
501 case UAC_GET_RES:
502 value = len;
503 break;
504 case UAC_GET_MEM:
505 break;
506 default:
507 break;
508 }
509
510 return value;
511 }
512
513 static int
f_audio_setup(struct usb_function * f,const struct usb_ctrlrequest * ctrl)514 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
515 {
516 struct usb_composite_dev *cdev = f->config->cdev;
517 struct usb_request *req = cdev->req;
518 int value = -EOPNOTSUPP;
519 u16 w_index = le16_to_cpu(ctrl->wIndex);
520 u16 w_value = le16_to_cpu(ctrl->wValue);
521 u16 w_length = le16_to_cpu(ctrl->wLength);
522
523 /* composite driver infrastructure handles everything; interface
524 * activation uses set_alt().
525 */
526 switch (ctrl->bRequestType) {
527 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
528 value = audio_set_intf_req(f, ctrl);
529 break;
530
531 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
532 value = audio_get_intf_req(f, ctrl);
533 break;
534
535 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
536 value = audio_set_endpoint_req(f, ctrl);
537 break;
538
539 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
540 value = audio_get_endpoint_req(f, ctrl);
541 break;
542
543 default:
544 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
545 ctrl->bRequestType, ctrl->bRequest,
546 w_value, w_index, w_length);
547 }
548
549 /* respond with data transfer or status phase? */
550 if (value >= 0) {
551 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
552 ctrl->bRequestType, ctrl->bRequest,
553 w_value, w_index, w_length);
554 req->zero = 0;
555 req->length = value;
556 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
557 if (value < 0)
558 ERROR(cdev, "audio response on err %d\n", value);
559 }
560
561 /* device either stalls (value < 0) or reports success */
562 return value;
563 }
564
f_audio_set_alt(struct usb_function * f,unsigned intf,unsigned alt)565 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
566 {
567 struct f_audio *audio = func_to_audio(f);
568 struct usb_composite_dev *cdev = f->config->cdev;
569 struct usb_ep *out_ep = audio->out_ep;
570 struct usb_request *req;
571 int i = 0, err = 0;
572
573 DBG(cdev, "intf %d, alt %d\n", intf, alt);
574
575 if (intf == 1) {
576 if (alt == 1) {
577 usb_ep_enable(out_ep);
578 out_ep->driver_data = audio;
579 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
580 if (IS_ERR(audio->copy_buf))
581 return -ENOMEM;
582
583 /*
584 * allocate a bunch of read buffers
585 * and queue them all at once.
586 */
587 for (i = 0; i < req_count && err == 0; i++) {
588 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
589 if (req) {
590 req->buf = kzalloc(req_buf_size,
591 GFP_ATOMIC);
592 if (req->buf) {
593 req->length = req_buf_size;
594 req->context = audio;
595 req->complete =
596 f_audio_complete;
597 err = usb_ep_queue(out_ep,
598 req, GFP_ATOMIC);
599 if (err)
600 ERROR(cdev,
601 "%s queue req: %d\n",
602 out_ep->name, err);
603 } else
604 err = -ENOMEM;
605 } else
606 err = -ENOMEM;
607 }
608
609 } else {
610 struct f_audio_buf *copy_buf = audio->copy_buf;
611 if (copy_buf) {
612 list_add_tail(©_buf->list,
613 &audio->play_queue);
614 schedule_work(&audio->playback_work);
615 }
616 }
617 }
618
619 return err;
620 }
621
f_audio_disable(struct usb_function * f)622 static void f_audio_disable(struct usb_function *f)
623 {
624 return;
625 }
626
627 /*-------------------------------------------------------------------------*/
628
f_audio_build_desc(struct f_audio * audio)629 static void f_audio_build_desc(struct f_audio *audio)
630 {
631 struct gaudio *card = &audio->card;
632 u8 *sam_freq;
633 int rate;
634
635 /* Set channel numbers */
636 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
637 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
638
639 /* Set sample rates */
640 rate = u_audio_get_playback_rate(card);
641 sam_freq = as_type_i_desc.tSamFreq[0];
642 memcpy(sam_freq, &rate, 3);
643
644 /* Todo: Set Sample bits and other parameters */
645
646 return;
647 }
648
649 /* audio function driver setup/binding */
650 static int __init
f_audio_bind(struct usb_configuration * c,struct usb_function * f)651 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
652 {
653 struct usb_composite_dev *cdev = c->cdev;
654 struct f_audio *audio = func_to_audio(f);
655 int status;
656 struct usb_ep *ep;
657
658 f_audio_build_desc(audio);
659
660 /* allocate instance-specific interface IDs, and patch descriptors */
661 status = usb_interface_id(c, f);
662 if (status < 0)
663 goto fail;
664 ac_interface_desc.bInterfaceNumber = status;
665
666 status = usb_interface_id(c, f);
667 if (status < 0)
668 goto fail;
669 as_interface_alt_0_desc.bInterfaceNumber = status;
670 as_interface_alt_1_desc.bInterfaceNumber = status;
671
672 status = -ENODEV;
673
674 /* allocate instance-specific endpoints */
675 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
676 if (!ep)
677 goto fail;
678 audio->out_ep = ep;
679 audio->out_ep->desc = &as_out_ep_desc;
680 ep->driver_data = cdev; /* claim */
681
682 status = -ENOMEM;
683
684 /* copy descriptors, and track endpoint copies */
685 f->descriptors = usb_copy_descriptors(f_audio_desc);
686
687 /*
688 * support all relevant hardware speeds... we expect that when
689 * hardware is dual speed, all bulk-capable endpoints work at
690 * both speeds
691 */
692 if (gadget_is_dualspeed(c->cdev->gadget)) {
693 c->highspeed = true;
694 f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
695 }
696
697 return 0;
698
699 fail:
700
701 return status;
702 }
703
704 static void
f_audio_unbind(struct usb_configuration * c,struct usb_function * f)705 f_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 usb_free_descriptors(f->hs_descriptors);
711 kfree(audio);
712 }
713
714 /*-------------------------------------------------------------------------*/
715
generic_set_cmd(struct usb_audio_control * con,u8 cmd,int value)716 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
717 {
718 con->data[cmd] = value;
719
720 return 0;
721 }
722
generic_get_cmd(struct usb_audio_control * con,u8 cmd)723 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
724 {
725 return con->data[cmd];
726 }
727
728 /* Todo: add more control selecotor dynamically */
control_selector_init(struct f_audio * audio)729 int __init control_selector_init(struct f_audio *audio)
730 {
731 INIT_LIST_HEAD(&audio->cs);
732 list_add(&feature_unit.list, &audio->cs);
733
734 INIT_LIST_HEAD(&feature_unit.control);
735 list_add(&mute_control.list, &feature_unit.control);
736 list_add(&volume_control.list, &feature_unit.control);
737
738 volume_control.data[UAC__CUR] = 0xffc0;
739 volume_control.data[UAC__MIN] = 0xe3a0;
740 volume_control.data[UAC__MAX] = 0xfff0;
741 volume_control.data[UAC__RES] = 0x0030;
742
743 return 0;
744 }
745
746 /**
747 * audio_bind_config - add USB audio function to a configuration
748 * @c: the configuration to supcard the USB audio function
749 * Context: single threaded during gadget setup
750 *
751 * Returns zero on success, else negative errno.
752 */
audio_bind_config(struct usb_configuration * c)753 int __init audio_bind_config(struct usb_configuration *c)
754 {
755 struct f_audio *audio;
756 int status;
757
758 /* allocate and initialize one new instance */
759 audio = kzalloc(sizeof *audio, GFP_KERNEL);
760 if (!audio)
761 return -ENOMEM;
762
763 audio->card.func.name = "g_audio";
764 audio->card.gadget = c->cdev->gadget;
765
766 INIT_LIST_HEAD(&audio->play_queue);
767 spin_lock_init(&audio->lock);
768
769 /* set up ASLA audio devices */
770 status = gaudio_setup(&audio->card);
771 if (status < 0)
772 goto setup_fail;
773
774 audio->card.func.strings = audio_strings;
775 audio->card.func.bind = f_audio_bind;
776 audio->card.func.unbind = f_audio_unbind;
777 audio->card.func.set_alt = f_audio_set_alt;
778 audio->card.func.setup = f_audio_setup;
779 audio->card.func.disable = f_audio_disable;
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
794 add_fail:
795 gaudio_cleanup();
796 setup_fail:
797 kfree(audio);
798 return status;
799 }
800