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Merge tag 'usb-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[linux-block.git] / drivers / usb / gadget / function / f_uac1_legacy.c
CommitLineData
5fd54ace 1// SPDX-License-Identifier: GPL-2.0+
c6994e6f
BW		 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
c6994e6f
BW		 7 */
8
5a0e3ad6 9#include <linux/slab.h>
c6994e6f 10#include <linux/kernel.h>
f3a3406b 11#include <linux/module.h>
c6994e6f 12#include <linux/device.h>
60063497 13#include <linux/atomic.h>
c6994e6f 14
d355339e 15#include "u_uac1_legacy.h"
c6994e6f 16
b95cd7ec
LP		 17static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
18static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
19
c6994e6f
BW		 20/*
21 * DESCRIPTORS ... most are static, but strings and full
22 * configuration descriptors are built on demand.
23 */
24
25/*
26 * We have two interfaces- AudioControl and AudioStreaming
27 * TODO: only supcard playback currently
28 */
29#define F_AUDIO_AC_INTERFACE 0
30#define F_AUDIO_AS_INTERFACE 1
8d252db1 31#define F_AUDIO_NUM_INTERFACES 1
c6994e6f
BW		 32
33/* B.3.1 Standard AC Interface Descriptor */
f3a3406b 34static struct usb_interface_descriptor ac_interface_desc = {
c6994e6f
BW		 35 .bLength = USB_DT_INTERFACE_SIZE,
36 .bDescriptorType = USB_DT_INTERFACE,
37 .bNumEndpoints = 0,
38 .bInterfaceClass = USB_CLASS_AUDIO,
39 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
40};
41
8d252db1
XW		 42/*
43 * The number of AudioStreaming and MIDIStreaming interfaces
44 * in the Audio Interface Collection
45 */
46DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
c6994e6f 47
512ad27d 48#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
d16f1726
CC		 49/* 1 input terminal, 1 output terminal and 1 feature unit */
50#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
51 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
c6994e6f 52/* B.3.2 Class-Specific AC Interface Descriptor */
8d252db1 53static struct uac1_ac_header_descriptor_1 ac_header_desc = {
512ad27d 54 .bLength = UAC_DT_AC_HEADER_LENGTH,
c6994e6f 55 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 56 .bDescriptorSubtype = UAC_HEADER,
0c91ca47
SS		 57 .bcdADC = cpu_to_le16(0x0100),
58 .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
c6994e6f
BW		 59 .bInCollection = F_AUDIO_NUM_INTERFACES,
60 .baInterfaceNr = {
8d252db1
XW		 61 /* Interface number of the first AudioStream interface */
62 [0] = 1,
c6994e6f
BW		 63 }
64};
65
66#define INPUT_TERMINAL_ID 1
512ad27d
LP		 67static struct uac_input_terminal_descriptor input_terminal_desc = {
68 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
c6994e6f 69 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 70 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
c6994e6f 71 .bTerminalID = INPUT_TERMINAL_ID,
512ad27d 72 .wTerminalType = UAC_TERMINAL_STREAMING,
c6994e6f
BW		 73 .bAssocTerminal = 0,
74 .wChannelConfig = 0x3,
75};
76
512ad27d 77DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
c6994e6f
BW		 78
79#define FEATURE_UNIT_ID 2
512ad27d
LP		 80static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
81 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
c6994e6f 82 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 83 .bDescriptorSubtype = UAC_FEATURE_UNIT,
c6994e6f
BW		 84 .bUnitID = FEATURE_UNIT_ID,
85 .bSourceID = INPUT_TERMINAL_ID,
86 .bControlSize = 2,
512ad27d 87 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
c6994e6f
BW		 88};
89
90static struct usb_audio_control mute_control = {
91 .list = LIST_HEAD_INIT(mute_control.list),
92 .name = "Mute Control",
f07ff97b 93 .type = UAC_FU_MUTE,
c6994e6f
BW		 94 /* Todo: add real Mute control code */
95 .set = generic_set_cmd,
96 .get = generic_get_cmd,
97};
98
99static struct usb_audio_control volume_control = {
100 .list = LIST_HEAD_INIT(volume_control.list),
101 .name = "Volume Control",
f07ff97b 102 .type = UAC_FU_VOLUME,
c6994e6f
BW		 103 /* Todo: add real Volume control code */
104 .set = generic_set_cmd,
105 .get = generic_get_cmd,
106};
107
108static struct usb_audio_control_selector feature_unit = {
109 .list = LIST_HEAD_INIT(feature_unit.list),
110 .id = FEATURE_UNIT_ID,
111 .name = "Mute & Volume Control",
512ad27d 112 .type = UAC_FEATURE_UNIT,
c6994e6f
BW		 113 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
114};
115
116#define OUTPUT_TERMINAL_ID 3
69da9bcb 117static struct uac1_output_terminal_descriptor output_terminal_desc = {
512ad27d 118 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
c6994e6f 119 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 120 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
c6994e6f 121 .bTerminalID = OUTPUT_TERMINAL_ID,
512ad27d 122 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
c6994e6f
BW		 123 .bAssocTerminal = FEATURE_UNIT_ID,
124 .bSourceID = FEATURE_UNIT_ID,
125};
126
127/* B.4.1 Standard AS Interface Descriptor */
128static struct usb_interface_descriptor as_interface_alt_0_desc = {
129 .bLength = USB_DT_INTERFACE_SIZE,
130 .bDescriptorType = USB_DT_INTERFACE,
131 .bAlternateSetting = 0,
132 .bNumEndpoints = 0,
133 .bInterfaceClass = USB_CLASS_AUDIO,
134 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
135};
136
137static struct usb_interface_descriptor as_interface_alt_1_desc = {
138 .bLength = USB_DT_INTERFACE_SIZE,
139 .bDescriptorType = USB_DT_INTERFACE,
140 .bAlternateSetting = 1,
141 .bNumEndpoints = 1,
142 .bInterfaceClass = USB_CLASS_AUDIO,
143 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
144};
145
146/* B.4.2 Class-Specific AS Interface Descriptor */
69da9bcb 147static struct uac1_as_header_descriptor as_header_desc = {
512ad27d 148 .bLength = UAC_DT_AS_HEADER_SIZE,
c6994e6f 149 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d 150 .bDescriptorSubtype = UAC_AS_GENERAL,
c6994e6f
BW		 151 .bTerminalLink = INPUT_TERMINAL_ID,
152 .bDelay = 1,
512ad27d 153 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
c6994e6f
BW		 154};
155
512ad27d 156DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
c6994e6f 157
512ad27d
LP		 158static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
159 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
c6994e6f 160 .bDescriptorType = USB_DT_CS_INTERFACE,
512ad27d
LP		 161 .bDescriptorSubtype = UAC_FORMAT_TYPE,
162 .bFormatType = UAC_FORMAT_TYPE_I,
c6994e6f
BW		 163 .bSubframeSize = 2,
164 .bBitResolution = 16,
165 .bSamFreqType = 1,
166};
167
168/* Standard ISO OUT Endpoint Descriptor */
e6251a92 169static struct usb_endpoint_descriptor as_out_ep_desc = {
c6994e6f
BW		 170 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
171 .bDescriptorType = USB_DT_ENDPOINT,
172 .bEndpointAddress = USB_DIR_OUT,
85e08ca5 173 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
c6994e6f 174 | USB_ENDPOINT_XFER_ISOC,
bcec9784 175 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
c6994e6f
BW		 176 .bInterval = 4,
177};
178
179/* Class-specific AS ISO OUT Endpoint Descriptor */
f3a3406b 180static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
512ad27d 181 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
c6994e6f 182 .bDescriptorType = USB_DT_CS_ENDPOINT,
512ad27d 183 .bDescriptorSubtype = UAC_EP_GENERAL,
c6994e6f
BW		 184 .bmAttributes = 1,
185 .bLockDelayUnits = 1,
0c91ca47 186 .wLockDelay = cpu_to_le16(1),
c6994e6f
BW		 187};
188
f3a3406b 189static struct usb_descriptor_header *f_audio_desc[] = {
c6994e6f
BW		 190 (struct usb_descriptor_header *)&ac_interface_desc,
191 (struct usb_descriptor_header *)&ac_header_desc,
192
193 (struct usb_descriptor_header *)&input_terminal_desc,
194 (struct usb_descriptor_header *)&output_terminal_desc,
195 (struct usb_descriptor_header *)&feature_unit_desc,
196
197 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
198 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
199 (struct usb_descriptor_header *)&as_header_desc,
200
201 (struct usb_descriptor_header *)&as_type_i_desc,
202
203 (struct usb_descriptor_header *)&as_out_ep_desc,
204 (struct usb_descriptor_header *)&as_iso_out_desc,
205 NULL,
206};
207
f73db69f
AP		 208enum {
209 STR_AC_IF,
210 STR_INPUT_TERMINAL,
211 STR_INPUT_TERMINAL_CH_NAMES,
212 STR_FEAT_DESC_0,
213 STR_OUTPUT_TERMINAL,
214 STR_AS_IF_ALT0,
215 STR_AS_IF_ALT1,
216};
217
218static struct usb_string strings_uac1[] = {
219 [STR_AC_IF].s = "AC Interface",
220 [STR_INPUT_TERMINAL].s = "Input terminal",
221 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
222 [STR_FEAT_DESC_0].s = "Volume control & mute",
223 [STR_OUTPUT_TERMINAL].s = "Output terminal",
224 [STR_AS_IF_ALT0].s = "AS Interface",
225 [STR_AS_IF_ALT1].s = "AS Interface",
226 { },
227};
228
229static struct usb_gadget_strings str_uac1 = {
230 .language = 0x0409, /* en-us */
231 .strings = strings_uac1,
232};
233
234static struct usb_gadget_strings *uac1_strings[] = {
235 &str_uac1,
236 NULL,
237};
238
c6994e6f
BW		 239/*
240 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
241 */
242
243/*-------------------------------------------------------------------------*/
244struct f_audio_buf {
245 u8 *buf;
246 int actual;
247 struct list_head list;
248};
249
250static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
251{
252 struct f_audio_buf *copy_buf;
253
254 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
255 if (!copy_buf)
ff3b968c 256 return ERR_PTR(-ENOMEM);
c6994e6f
BW		 257
258 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
259 if (!copy_buf->buf) {
260 kfree(copy_buf);
ff3b968c 261 return ERR_PTR(-ENOMEM);
c6994e6f
BW		 262 }
263
264 return copy_buf;
265}
266
267static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
268{
269 kfree(audio_buf->buf);
270 kfree(audio_buf);
271}
272/*-------------------------------------------------------------------------*/
273
274struct f_audio {
275 struct gaudio card;
276
1fc4926d
RB		 277 u8 ac_intf, ac_alt;
278 u8 as_intf, as_alt;
279
c6994e6f
BW		 280 /* endpoints handle full and/or high speeds */
281 struct usb_ep *out_ep;
c6994e6f
BW		 282
283 spinlock_t lock;
284 struct f_audio_buf *copy_buf;
285 struct work_struct playback_work;
286 struct list_head play_queue;
287
288 /* Control Set command */
289 struct list_head cs;
290 u8 set_cmd;
291 struct usb_audio_control *set_con;
292};
293
294static inline struct f_audio *func_to_audio(struct usb_function *f)
295{
296 return container_of(f, struct f_audio, card.func);
297}
298
299/*-------------------------------------------------------------------------*/
300
301static void f_audio_playback_work(struct work_struct *data)
302{
303 struct f_audio *audio = container_of(data, struct f_audio,
304 playback_work);
305 struct f_audio_buf *play_buf;
306
307 spin_lock_irq(&audio->lock);
308 if (list_empty(&audio->play_queue)) {
309 spin_unlock_irq(&audio->lock);
310 return;
311 }
312 play_buf = list_first_entry(&audio->play_queue,
313 struct f_audio_buf, list);
314 list_del(&play_buf->list);
315 spin_unlock_irq(&audio->lock);
316
317 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
318 f_audio_buffer_free(play_buf);
c6994e6f
BW		 319}
320
321static 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;
d355339e 326 struct f_uac1_legacy_opts *opts;
f3a3406b 327 int audio_buf_size;
c6994e6f
BW		 328 int err;
329
d355339e 330 opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts,
f3a3406b
AP		 331 func_inst);
332 audio_buf_size = opts->audio_buf_size;
605ef833 333
c6994e6f
BW		 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);
ff3b968c 342 if (IS_ERR(copy_buf))
c6994e6f
BW		 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
358static 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
382static 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
418static 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;
fddedd83 450 len = min_t(size_t, sizeof(value), len);
c6994e6f
BW		 451 memcpy(req->buf, &value, len);
452
453 return len;
454}
455
0ad72524
LP		 456static 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:
7c5881d1 470 value = len;
0ad72524
LP		 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
492static 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:
7c5881d1 509 value = len;
0ad72524
LP		 510 break;
511 case UAC_GET_MEM:
512 break;
513 default:
514 break;
515 }
516
517 return value;
518}
519
c6994e6f
BW		 520static int
521f_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
0ad72524
LP		 530 /* composite driver infrastructure handles everything; interface
531 * activation uses set_alt().
c6994e6f
BW		 532 */
533 switch (ctrl->bRequestType) {
512ad27d 534 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 535 value = audio_set_intf_req(f, ctrl);
536 break;
537
512ad27d 538 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
c6994e6f
BW		 539 value = audio_get_intf_req(f, ctrl);
540 break;
541
0ad72524
LP		 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
c6994e6f
BW		 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
572static 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;
d355339e 578 struct f_uac1_legacy_opts *opts;
f3a3406b 579 int req_buf_size, req_count, audio_buf_size;
c6994e6f
BW		 580 int i = 0, err = 0;
581
582 DBG(cdev, "intf %d, alt %d\n", intf, alt);
583
d355339e 584 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
f3a3406b
AP		 585 req_buf_size = opts->req_buf_size;
586 req_count = opts->req_count;
587 audio_buf_size = opts->audio_buf_size;
588
1fc4926d
RB		 589 /* No i/f has more than 2 alt settings */
590 if (alt > 1) {
591 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
592 return -EINVAL;
593 }
594
595 if (intf == audio->ac_intf) {
596 /* Control I/f has only 1 AltSetting - 0 */
597 if (alt) {
598 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
599 return -EINVAL;
600 }
601 return 0;
602 } else if (intf == audio->as_intf) {
c6994e6f 603 if (alt == 1) {
ca4de53c
MT		 604 err = config_ep_by_speed(cdev->gadget, f, out_ep);
605 if (err)
606 return err;
607
72c973dd 608 usb_ep_enable(out_ep);
c6994e6f 609 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
ff3b968c
JL		 610 if (IS_ERR(audio->copy_buf))
611 return -ENOMEM;
c6994e6f
BW		 612
613 /*
614 * allocate a bunch of read buffers
615 * and queue them all at once.
616 */
617 for (i = 0; i < req_count && err == 0; i++) {
618 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
619 if (req) {
620 req->buf = kzalloc(req_buf_size,
621 GFP_ATOMIC);
622 if (req->buf) {
623 req->length = req_buf_size;
624 req->context = audio;
625 req->complete =
626 f_audio_complete;
627 err = usb_ep_queue(out_ep,
628 req, GFP_ATOMIC);
629 if (err)
630 ERROR(cdev,
631 "%s queue req: %d\n",
632 out_ep->name, err);
633 } else
634 err = -ENOMEM;
635 } else
636 err = -ENOMEM;
637 }
638
639 } else {
640 struct f_audio_buf *copy_buf = audio->copy_buf;
641 if (copy_buf) {
642 list_add_tail(&copy_buf->list,
643 &audio->play_queue);
644 schedule_work(&audio->playback_work);
645 }
646 }
1fc4926d 647 audio->as_alt = alt;
c6994e6f
BW		 648 }
649
650 return err;
651}
652
1fc4926d
RB		 653static int f_audio_get_alt(struct usb_function *f, unsigned intf)
654{
655 struct f_audio *audio = func_to_audio(f);
656 struct usb_composite_dev *cdev = f->config->cdev;
657
658 if (intf == audio->ac_intf)
659 return audio->ac_alt;
660 else if (intf == audio->as_intf)
661 return audio->as_alt;
662 else
663 ERROR(cdev, "%s:%d Invalid Interface %d!\n",
664 __func__, __LINE__, intf);
665
666 return -EINVAL;
667}
668
c6994e6f
BW		 669static void f_audio_disable(struct usb_function *f)
670{
671 return;
672}
673
674/*-------------------------------------------------------------------------*/
675
676static void f_audio_build_desc(struct f_audio *audio)
677{
678 struct gaudio *card = &audio->card;
679 u8 *sam_freq;
680 int rate;
681
682 /* Set channel numbers */
683 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
684 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
685
686 /* Set sample rates */
687 rate = u_audio_get_playback_rate(card);
688 sam_freq = as_type_i_desc.tSamFreq[0];
689 memcpy(sam_freq, &rate, 3);
690
691 /* Todo: Set Sample bits and other parameters */
692
693 return;
694}
695
696/* audio function driver setup/binding */
f3a3406b 697static int
c6994e6f
BW		 698f_audio_bind(struct usb_configuration *c, struct usb_function *f)
699{
700 struct usb_composite_dev *cdev = c->cdev;
701 struct f_audio *audio = func_to_audio(f);
807dccdb 702 struct usb_string *us;
c6994e6f 703 int status;
10287bae 704 struct usb_ep *ep = NULL;
d355339e 705 struct f_uac1_legacy_opts *audio_opts;
f3a3406b 706
d355339e 707 audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
f3a3406b 708 audio->card.gadget = c->cdev->gadget;
f3a3406b
AP		 709 /* set up ASLA audio devices */
710 if (!audio_opts->bound) {
711 status = gaudio_setup(&audio->card);
712 if (status < 0)
713 return status;
714 audio_opts->bound = true;
715 }
807dccdb
AP		 716 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
717 if (IS_ERR(us))
718 return PTR_ERR(us);
719 ac_interface_desc.iInterface = us[STR_AC_IF].id;
720 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
721 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
722 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
723 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
724 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
725 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
726
c6994e6f
BW		 727
728 f_audio_build_desc(audio);
729
730 /* allocate instance-specific interface IDs, and patch descriptors */
731 status = usb_interface_id(c, f);
732 if (status < 0)
733 goto fail;
734 ac_interface_desc.bInterfaceNumber = status;
1fc4926d
RB		 735 audio->ac_intf = status;
736 audio->ac_alt = 0;
c6994e6f
BW		 737
738 status = usb_interface_id(c, f);
739 if (status < 0)
740 goto fail;
741 as_interface_alt_0_desc.bInterfaceNumber = status;
742 as_interface_alt_1_desc.bInterfaceNumber = status;
1fc4926d
RB		 743 audio->as_intf = status;
744 audio->as_alt = 0;
c6994e6f
BW		 745
746 status = -ENODEV;
747
748 /* allocate instance-specific endpoints */
749 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
750 if (!ep)
751 goto fail;
752 audio->out_ep = ep;
72c973dd 753 audio->out_ep->desc = &as_out_ep_desc;
c6994e6f 754
ef7f584c 755 /* copy descriptors, and track endpoint copies */
eaef50c7
JY		 756 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
757 NULL);
10287bae
SAS		 758 if (status)
759 goto fail;
c6994e6f
BW		 760 return 0;
761
762fail:
f3a3406b 763 gaudio_cleanup(&audio->card);
c6994e6f
BW		 764 return status;
765}
766
c6994e6f
BW		 767/*-------------------------------------------------------------------------*/
768
b95cd7ec
LP		 769static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
770{
771 con->data[cmd] = value;
772
773 return 0;
774}
775
776static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
777{
778 return con->data[cmd];
779}
780
c6994e6f 781/* Todo: add more control selecotor dynamically */
f3a3406b 782static int control_selector_init(struct f_audio *audio)
c6994e6f
BW		 783{
784 INIT_LIST_HEAD(&audio->cs);
785 list_add(&feature_unit.list, &audio->cs);
786
787 INIT_LIST_HEAD(&feature_unit.control);
788 list_add(&mute_control.list, &feature_unit.control);
789 list_add(&volume_control.list, &feature_unit.control);
790
512ad27d
LP		 791 volume_control.data[UAC__CUR] = 0xffc0;
792 volume_control.data[UAC__MIN] = 0xe3a0;
793 volume_control.data[UAC__MAX] = 0xfff0;
794 volume_control.data[UAC__RES] = 0x0030;
c6994e6f
BW		 795
796 return 0;
797}
798
d355339e
RB		 799static inline
800struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item)
0854611a 801{
d355339e 802 return container_of(to_config_group(item), struct f_uac1_legacy_opts,
0854611a
AP		 803 func_inst.group);
804}
805
0854611a
AP		 806static void f_uac1_attr_release(struct config_item *item)
807{
d355339e 808 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item);
0854611a
AP		 809
810 usb_put_function_instance(&opts->func_inst);
811}
812
813static struct configfs_item_operations f_uac1_item_ops = {
814 .release = f_uac1_attr_release,
0854611a
AP		 815};
816
817#define UAC1_INT_ATTRIBUTE(name) \
c6f89f1c 818static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
0854611a
AP		 819 char *page) \
820{ \
d355339e 821 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
0854611a
AP		 822 int result; \
823 \
824 mutex_lock(&opts->lock); \
825 result = sprintf(page, "%u\n", opts->name); \
826 mutex_unlock(&opts->lock); \
827 \
828 return result; \
829} \
830 \
c6f89f1c 831static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
0854611a
AP		 832 const char *page, size_t len) \
833{ \
d355339e 834 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
0854611a
AP		 835 int ret; \
836 u32 num; \
837 \
838 mutex_lock(&opts->lock); \
839 if (opts->refcnt) { \
840 ret = -EBUSY; \
841 goto end; \
842 } \
843 \
844 ret = kstrtou32(page, 0, &num); \
845 if (ret) \
846 goto end; \
847 \
848 opts->name = num; \
849 ret = len; \
850 \
851end: \
852 mutex_unlock(&opts->lock); \
853 return ret; \
854} \
855 \
c6f89f1c 856CONFIGFS_ATTR(f_uac1_opts_, name)
0854611a
AP		 857
858UAC1_INT_ATTRIBUTE(req_buf_size);
859UAC1_INT_ATTRIBUTE(req_count);
860UAC1_INT_ATTRIBUTE(audio_buf_size);
861
862#define UAC1_STR_ATTRIBUTE(name) \
c6f89f1c 863static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
0854611a
AP		 864 char *page) \
865{ \
d355339e 866 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
0854611a
AP		 867 int result; \
868 \
869 mutex_lock(&opts->lock); \
870 result = sprintf(page, "%s\n", opts->name); \
871 mutex_unlock(&opts->lock); \
872 \
873 return result; \
874} \
875 \
c6f89f1c 876static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
0854611a
AP		 877 const char *page, size_t len) \
878{ \
d355339e 879 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
0854611a
AP		 880 int ret = -EBUSY; \
881 char *tmp; \
882 \
883 mutex_lock(&opts->lock); \
884 if (opts->refcnt) \
885 goto end; \
886 \
887 tmp = kstrndup(page, len, GFP_KERNEL); \
888 if (tmp) { \
889 ret = -ENOMEM; \
890 goto end; \
891 } \
892 if (opts->name##_alloc) \
893 kfree(opts->name); \
894 opts->name##_alloc = true; \
895 opts->name = tmp; \
896 ret = len; \
897 \
898end: \
899 mutex_unlock(&opts->lock); \
900 return ret; \
901} \
902 \
c6f89f1c 903CONFIGFS_ATTR(f_uac1_opts_, name)
0854611a
AP		 904
905UAC1_STR_ATTRIBUTE(fn_play);
906UAC1_STR_ATTRIBUTE(fn_cap);
907UAC1_STR_ATTRIBUTE(fn_cntl);
908
909static struct configfs_attribute *f_uac1_attrs[] = {
c6f89f1c
CH		 910 &f_uac1_opts_attr_req_buf_size,
911 &f_uac1_opts_attr_req_count,
912 &f_uac1_opts_attr_audio_buf_size,
913 &f_uac1_opts_attr_fn_play,
914 &f_uac1_opts_attr_fn_cap,
915 &f_uac1_opts_attr_fn_cntl,
0854611a
AP		 916 NULL,
917};
918
97363902 919static const struct config_item_type f_uac1_func_type = {
0854611a
AP		 920 .ct_item_ops = &f_uac1_item_ops,
921 .ct_attrs = f_uac1_attrs,
922 .ct_owner = THIS_MODULE,
923};
924
f3a3406b
AP		 925static void f_audio_free_inst(struct usb_function_instance *f)
926{
d355339e 927 struct f_uac1_legacy_opts *opts;
f3a3406b 928
d355339e 929 opts = container_of(f, struct f_uac1_legacy_opts, func_inst);
0854611a
AP		 930 if (opts->fn_play_alloc)
931 kfree(opts->fn_play);
932 if (opts->fn_cap_alloc)
933 kfree(opts->fn_cap);
934 if (opts->fn_cntl_alloc)
935 kfree(opts->fn_cntl);
f3a3406b
AP		 936 kfree(opts);
937}
938
939static struct usb_function_instance *f_audio_alloc_inst(void)
940{
d355339e 941 struct f_uac1_legacy_opts *opts;
f3a3406b
AP		 942
943 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
944 if (!opts)
945 return ERR_PTR(-ENOMEM);
946
0854611a 947 mutex_init(&opts->lock);
f3a3406b
AP		 948 opts->func_inst.free_func_inst = f_audio_free_inst;
949
0854611a
AP		 950 config_group_init_type_name(&opts->func_inst.group, "",
951 &f_uac1_func_type);
952
953 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
954 opts->req_count = UAC1_REQ_COUNT;
955 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
956 opts->fn_play = FILE_PCM_PLAYBACK;
957 opts->fn_cap = FILE_PCM_CAPTURE;
958 opts->fn_cntl = FILE_CONTROL;
f3a3406b
AP		 959 return &opts->func_inst;
960}
961
962static void f_audio_free(struct usb_function *f)
963{
964 struct f_audio *audio = func_to_audio(f);
d355339e 965 struct f_uac1_legacy_opts *opts;
f3a3406b 966
4fde6204 967 gaudio_cleanup(&audio->card);
d355339e 968 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
f3a3406b 969 kfree(audio);
0854611a
AP		 970 mutex_lock(&opts->lock);
971 --opts->refcnt;
972 mutex_unlock(&opts->lock);
f3a3406b
AP		 973}
974
975static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
976{
977 usb_free_all_descriptors(f);
978}
979
980static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
981{
982 struct f_audio *audio;
d355339e 983 struct f_uac1_legacy_opts *opts;
f3a3406b
AP		 984
985 /* allocate and initialize one new instance */
986 audio = kzalloc(sizeof(*audio), GFP_KERNEL);
987 if (!audio)
988 return ERR_PTR(-ENOMEM);
989
990 audio->card.func.name = "g_audio";
991
d355339e 992 opts = container_of(fi, struct f_uac1_legacy_opts, func_inst);
0854611a
AP		 993 mutex_lock(&opts->lock);
994 ++opts->refcnt;
995 mutex_unlock(&opts->lock);
f3a3406b
AP		 996 INIT_LIST_HEAD(&audio->play_queue);
997 spin_lock_init(&audio->lock);
998
f3a3406b
AP		 999 audio->card.func.bind = f_audio_bind;
1000 audio->card.func.unbind = f_audio_unbind;
1001 audio->card.func.set_alt = f_audio_set_alt;
1fc4926d 1002 audio->card.func.get_alt = f_audio_get_alt;
f3a3406b
AP		 1003 audio->card.func.setup = f_audio_setup;
1004 audio->card.func.disable = f_audio_disable;
1005 audio->card.func.free_func = f_audio_free;
1006
1007 control_selector_init(audio);
1008
1009 INIT_WORK(&audio->playback_work, f_audio_playback_work);
1010
1011 return &audio->card.func;
1012}
1013
d355339e 1014DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc);
f3a3406b
AP		 1015MODULE_LICENSE("GPL");
1016MODULE_AUTHOR("Bryan Wu");
Linux 6.x block layer and io_uring tree(s)