Loading...
Note: File does not exist in v3.1.
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
4 *
5 * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
6 * Copyright (C) 2021 Julian Scheel <julian@jusst.de>
7 *
8 * This driver doesn't expect any real Audio codec to be present
9 * on the device - the audio streams are simply sinked to and
10 * sourced from a virtual ALSA sound card created.
11 *
12 * This file is based on f_uac1.c which is
13 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
14 * Copyright (C) 2008 Analog Devices, Inc
15 */
16
17#include <linux/usb/audio.h>
18#include <linux/module.h>
19
20#include "u_audio.h"
21#include "u_uac1.h"
22
23/* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */
24#define UAC1_CHANNEL_MASK 0x0FFF
25
26#define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID)
27#define USB_IN_FU_ID (in_feature_unit_desc->bUnitID)
28
29#define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
30#define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
31#define FUIN_EN(_opts) ((_opts)->p_mute_present \
32 || (_opts)->p_volume_present)
33#define FUOUT_EN(_opts) ((_opts)->c_mute_present \
34 || (_opts)->c_volume_present)
35
36struct f_uac1 {
37 struct g_audio g_audio;
38 u8 ac_intf, as_in_intf, as_out_intf;
39 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
40
41 struct usb_ctrlrequest setup_cr; /* will be used in data stage */
42
43 /* Interrupt IN endpoint of AC interface */
44 struct usb_ep *int_ep;
45 atomic_t int_count;
46 int ctl_id; /* EP id */
47 int c_srate; /* current capture srate */
48 int p_srate; /* current playback prate */
49};
50
51static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
52{
53 return container_of(f, struct f_uac1, g_audio.func);
54}
55
56static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio)
57{
58 return container_of(audio->func.fi, struct f_uac1_opts, func_inst);
59}
60
61/*
62 * DESCRIPTORS ... most are static, but strings and full
63 * configuration descriptors are built on demand.
64 */
65
66/*
67 * We have three interfaces - one AudioControl and two AudioStreaming
68 *
69 * The driver implements a simple UAC_1 topology.
70 * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
71 * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
72 */
73
74/* B.3.1 Standard AC Interface Descriptor */
75static struct usb_interface_descriptor ac_interface_desc = {
76 .bLength = USB_DT_INTERFACE_SIZE,
77 .bDescriptorType = USB_DT_INTERFACE,
78 /* .bNumEndpoints = DYNAMIC */
79 .bInterfaceClass = USB_CLASS_AUDIO,
80 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
81};
82
83/* B.3.2 Class-Specific AC Interface Descriptor */
84static struct uac1_ac_header_descriptor *ac_header_desc;
85
86static struct uac_input_terminal_descriptor usb_out_it_desc = {
87 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
88 .bDescriptorType = USB_DT_CS_INTERFACE,
89 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
90 /* .bTerminalID = DYNAMIC */
91 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
92 .bAssocTerminal = 0,
93 .wChannelConfig = cpu_to_le16(0x3),
94};
95
96static struct uac1_output_terminal_descriptor io_out_ot_desc = {
97 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
98 .bDescriptorType = USB_DT_CS_INTERFACE,
99 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
100 /* .bTerminalID = DYNAMIC */
101 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
102 .bAssocTerminal = 0,
103 /* .bSourceID = DYNAMIC */
104};
105
106static struct uac_input_terminal_descriptor io_in_it_desc = {
107 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
108 .bDescriptorType = USB_DT_CS_INTERFACE,
109 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
110 /* .bTerminalID = DYNAMIC */
111 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
112 .bAssocTerminal = 0,
113 .wChannelConfig = cpu_to_le16(0x3),
114};
115
116static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
117 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
118 .bDescriptorType = USB_DT_CS_INTERFACE,
119 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
120 /* .bTerminalID = DYNAMIC */
121 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
122 .bAssocTerminal = 0,
123 /* .bSourceID = DYNAMIC */
124};
125
126static struct uac_feature_unit_descriptor *in_feature_unit_desc;
127static struct uac_feature_unit_descriptor *out_feature_unit_desc;
128
129/* AC IN Interrupt Endpoint */
130static struct usb_endpoint_descriptor ac_int_ep_desc = {
131 .bLength = USB_DT_ENDPOINT_SIZE,
132 .bDescriptorType = USB_DT_ENDPOINT,
133 .bEndpointAddress = USB_DIR_IN,
134 .bmAttributes = USB_ENDPOINT_XFER_INT,
135 .wMaxPacketSize = cpu_to_le16(2),
136 .bInterval = 4,
137};
138
139/* B.4.1 Standard AS Interface Descriptor */
140static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
141 .bLength = USB_DT_INTERFACE_SIZE,
142 .bDescriptorType = USB_DT_INTERFACE,
143 .bAlternateSetting = 0,
144 .bNumEndpoints = 0,
145 .bInterfaceClass = USB_CLASS_AUDIO,
146 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
147};
148
149static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
150 .bLength = USB_DT_INTERFACE_SIZE,
151 .bDescriptorType = USB_DT_INTERFACE,
152 .bAlternateSetting = 1,
153 .bNumEndpoints = 1,
154 .bInterfaceClass = USB_CLASS_AUDIO,
155 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
156};
157
158static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
159 .bLength = USB_DT_INTERFACE_SIZE,
160 .bDescriptorType = USB_DT_INTERFACE,
161 .bAlternateSetting = 0,
162 .bNumEndpoints = 0,
163 .bInterfaceClass = USB_CLASS_AUDIO,
164 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
165};
166
167static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
168 .bLength = USB_DT_INTERFACE_SIZE,
169 .bDescriptorType = USB_DT_INTERFACE,
170 .bAlternateSetting = 1,
171 .bNumEndpoints = 1,
172 .bInterfaceClass = USB_CLASS_AUDIO,
173 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
174};
175
176/* B.4.2 Class-Specific AS Interface Descriptor */
177static struct uac1_as_header_descriptor as_out_header_desc = {
178 .bLength = UAC_DT_AS_HEADER_SIZE,
179 .bDescriptorType = USB_DT_CS_INTERFACE,
180 .bDescriptorSubtype = UAC_AS_GENERAL,
181 /* .bTerminalLink = DYNAMIC */
182 .bDelay = 1,
183 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
184};
185
186static struct uac1_as_header_descriptor as_in_header_desc = {
187 .bLength = UAC_DT_AS_HEADER_SIZE,
188 .bDescriptorType = USB_DT_CS_INTERFACE,
189 .bDescriptorSubtype = UAC_AS_GENERAL,
190 /* .bTerminalLink = DYNAMIC */
191 .bDelay = 1,
192 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
193};
194
195DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_MAX_RATES);
196#define uac_format_type_i_discrete_descriptor \
197 uac_format_type_i_discrete_descriptor_##UAC_MAX_RATES
198
199static struct uac_format_type_i_discrete_descriptor as_out_type_i_desc = {
200 .bLength = 0, /* filled on rate setup */
201 .bDescriptorType = USB_DT_CS_INTERFACE,
202 .bDescriptorSubtype = UAC_FORMAT_TYPE,
203 .bFormatType = UAC_FORMAT_TYPE_I,
204 .bSubframeSize = 2,
205 .bBitResolution = 16,
206 .bSamFreqType = 0, /* filled on rate setup */
207};
208
209/* Standard ISO OUT Endpoint Descriptor */
210static struct usb_endpoint_descriptor as_out_ep_desc = {
211 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
212 .bDescriptorType = USB_DT_ENDPOINT,
213 .bEndpointAddress = USB_DIR_OUT,
214 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
215 | USB_ENDPOINT_XFER_ISOC,
216 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
217 .bInterval = 4,
218};
219
220/* Class-specific AS ISO OUT Endpoint Descriptor */
221static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
222 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
223 .bDescriptorType = USB_DT_CS_ENDPOINT,
224 .bDescriptorSubtype = UAC_EP_GENERAL,
225 .bmAttributes = 1,
226 .bLockDelayUnits = 1,
227 .wLockDelay = cpu_to_le16(1),
228};
229
230static struct uac_format_type_i_discrete_descriptor as_in_type_i_desc = {
231 .bLength = 0, /* filled on rate setup */
232 .bDescriptorType = USB_DT_CS_INTERFACE,
233 .bDescriptorSubtype = UAC_FORMAT_TYPE,
234 .bFormatType = UAC_FORMAT_TYPE_I,
235 .bSubframeSize = 2,
236 .bBitResolution = 16,
237 .bSamFreqType = 0, /* filled on rate setup */
238};
239
240/* Standard ISO OUT Endpoint Descriptor */
241static struct usb_endpoint_descriptor as_in_ep_desc = {
242 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
243 .bDescriptorType = USB_DT_ENDPOINT,
244 .bEndpointAddress = USB_DIR_IN,
245 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
246 | USB_ENDPOINT_XFER_ISOC,
247 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
248 .bInterval = 4,
249};
250
251/* Class-specific AS ISO OUT Endpoint Descriptor */
252static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
253 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
254 .bDescriptorType = USB_DT_CS_ENDPOINT,
255 .bDescriptorSubtype = UAC_EP_GENERAL,
256 .bmAttributes = 1,
257 .bLockDelayUnits = 0,
258 .wLockDelay = 0,
259};
260
261static struct usb_descriptor_header *f_audio_desc[] = {
262 (struct usb_descriptor_header *)&ac_interface_desc,
263 (struct usb_descriptor_header *)&ac_header_desc,
264
265 (struct usb_descriptor_header *)&usb_out_it_desc,
266 (struct usb_descriptor_header *)&io_out_ot_desc,
267 (struct usb_descriptor_header *)&out_feature_unit_desc,
268
269 (struct usb_descriptor_header *)&io_in_it_desc,
270 (struct usb_descriptor_header *)&usb_in_ot_desc,
271 (struct usb_descriptor_header *)&in_feature_unit_desc,
272
273 (struct usb_descriptor_header *)&ac_int_ep_desc,
274
275 (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
276 (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
277 (struct usb_descriptor_header *)&as_out_header_desc,
278
279 (struct usb_descriptor_header *)&as_out_type_i_desc,
280
281 (struct usb_descriptor_header *)&as_out_ep_desc,
282 (struct usb_descriptor_header *)&as_iso_out_desc,
283
284 (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
285 (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
286 (struct usb_descriptor_header *)&as_in_header_desc,
287
288 (struct usb_descriptor_header *)&as_in_type_i_desc,
289
290 (struct usb_descriptor_header *)&as_in_ep_desc,
291 (struct usb_descriptor_header *)&as_iso_in_desc,
292 NULL,
293};
294
295/* Standard ISO OUT Endpoint Descriptor */
296static struct usb_endpoint_descriptor ss_as_out_ep_desc = {
297 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
298 .bDescriptorType = USB_DT_ENDPOINT,
299 .bEndpointAddress = USB_DIR_OUT,
300 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
301 | USB_ENDPOINT_XFER_ISOC,
302 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
303 .bInterval = 4,
304};
305
306static struct usb_ss_ep_comp_descriptor ss_as_out_ep_desc_comp = {
307 .bLength = sizeof(ss_as_out_ep_desc_comp),
308 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
309 .bMaxBurst = 0,
310 .bmAttributes = 0,
311 /* wBytesPerInterval = DYNAMIC */
312};
313
314/* Standard ISO OUT Endpoint Descriptor */
315static struct usb_endpoint_descriptor ss_as_in_ep_desc = {
316 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
317 .bDescriptorType = USB_DT_ENDPOINT,
318 .bEndpointAddress = USB_DIR_IN,
319 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
320 | USB_ENDPOINT_XFER_ISOC,
321 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
322 .bInterval = 4,
323};
324
325static struct usb_ss_ep_comp_descriptor ss_as_in_ep_desc_comp = {
326 .bLength = sizeof(ss_as_in_ep_desc_comp),
327 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
328 .bMaxBurst = 0,
329 .bmAttributes = 0,
330 /* wBytesPerInterval = DYNAMIC */
331};
332
333static struct usb_descriptor_header *f_audio_ss_desc[] = {
334 (struct usb_descriptor_header *)&ac_interface_desc,
335 (struct usb_descriptor_header *)&ac_header_desc,
336
337 (struct usb_descriptor_header *)&usb_out_it_desc,
338 (struct usb_descriptor_header *)&io_out_ot_desc,
339 (struct usb_descriptor_header *)&io_in_it_desc,
340 (struct usb_descriptor_header *)&usb_in_ot_desc,
341
342 (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
343 (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
344 (struct usb_descriptor_header *)&as_out_header_desc,
345
346 (struct usb_descriptor_header *)&as_out_type_i_desc,
347
348 //(struct usb_descriptor_header *)&as_out_ep_desc,
349 (struct usb_descriptor_header *)&ss_as_out_ep_desc,
350 (struct usb_descriptor_header *)&ss_as_out_ep_desc_comp,
351 (struct usb_descriptor_header *)&as_iso_out_desc,
352
353 (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
354 (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
355 (struct usb_descriptor_header *)&as_in_header_desc,
356
357 (struct usb_descriptor_header *)&as_in_type_i_desc,
358
359 //(struct usb_descriptor_header *)&as_in_ep_desc,
360 (struct usb_descriptor_header *)&ss_as_in_ep_desc,
361 (struct usb_descriptor_header *)&ss_as_in_ep_desc_comp,
362 (struct usb_descriptor_header *)&as_iso_in_desc,
363 NULL,
364};
365
366enum {
367 STR_AC_IF,
368 STR_USB_OUT_IT,
369 STR_USB_OUT_IT_CH_NAMES,
370 STR_IO_OUT_OT,
371 STR_IO_IN_IT,
372 STR_IO_IN_IT_CH_NAMES,
373 STR_USB_IN_OT,
374 STR_FU_IN,
375 STR_FU_OUT,
376 STR_AS_OUT_IF_ALT0,
377 STR_AS_OUT_IF_ALT1,
378 STR_AS_IN_IF_ALT0,
379 STR_AS_IN_IF_ALT1,
380};
381
382static struct usb_string strings_uac1[] = {
383 /* [STR_AC_IF].s = DYNAMIC, */
384 [STR_USB_OUT_IT].s = "Playback Input terminal",
385 [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
386 [STR_IO_OUT_OT].s = "Playback Output terminal",
387 [STR_IO_IN_IT].s = "Capture Input terminal",
388 [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
389 [STR_USB_IN_OT].s = "Capture Output terminal",
390 [STR_FU_IN].s = "Capture Volume",
391 [STR_FU_OUT].s = "Playback Volume",
392 [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
393 [STR_AS_OUT_IF_ALT1].s = "Playback Active",
394 [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
395 [STR_AS_IN_IF_ALT1].s = "Capture Active",
396 { },
397};
398
399static struct usb_gadget_strings str_uac1 = {
400 .language = 0x0409, /* en-us */
401 .strings = strings_uac1,
402};
403
404static struct usb_gadget_strings *uac1_strings[] = {
405 &str_uac1,
406 NULL,
407};
408
409/*
410 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
411 */
412
413static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
414{
415 struct usb_function *fn = ep->driver_data;
416 struct usb_composite_dev *cdev = fn->config->cdev;
417 struct g_audio *agdev = func_to_g_audio(fn);
418 struct f_uac1 *uac1 = func_to_uac1(fn);
419 u8 *buf = (u8 *)req->buf;
420 u32 val = 0;
421
422 if (req->actual != 3) {
423 WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
424 return;
425 }
426
427 val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
428 if (uac1->ctl_id == (USB_DIR_IN | 2)) {
429 uac1->p_srate = val;
430 u_audio_set_playback_srate(agdev, uac1->p_srate);
431 } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
432 uac1->c_srate = val;
433 u_audio_set_capture_srate(agdev, uac1->c_srate);
434 }
435}
436
437static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
438{
439 struct g_audio *audio = req->context;
440 struct f_uac1 *uac1 = func_to_uac1(&audio->func);
441
442 atomic_dec(&uac1->int_count);
443 kfree(req->buf);
444 usb_ep_free_request(_ep, req);
445}
446
447static int audio_notify(struct g_audio *audio, int unit_id, int cs)
448{
449 struct f_uac1 *uac1 = func_to_uac1(&audio->func);
450 struct usb_request *req;
451 struct uac1_status_word *msg;
452 int ret;
453
454 if (!uac1->int_ep->enabled)
455 return 0;
456
457 if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) {
458 atomic_dec(&uac1->int_count);
459 return 0;
460 }
461
462 req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC);
463 if (req == NULL) {
464 ret = -ENOMEM;
465 goto err_dec_int_count;
466 }
467
468 msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
469 if (msg == NULL) {
470 ret = -ENOMEM;
471 goto err_free_request;
472 }
473
474 msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING
475 | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF;
476 msg->bOriginator = unit_id;
477
478 req->length = sizeof(*msg);
479 req->buf = msg;
480 req->context = audio;
481 req->complete = audio_notify_complete;
482
483 ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC);
484
485 if (ret)
486 goto err_free_msg;
487
488 return 0;
489
490err_free_msg:
491 kfree(msg);
492err_free_request:
493 usb_ep_free_request(uac1->int_ep, req);
494err_dec_int_count:
495 atomic_dec(&uac1->int_count);
496
497 return ret;
498}
499
500static int
501in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
502{
503 struct usb_request *req = fn->config->cdev->req;
504 struct g_audio *audio = func_to_g_audio(fn);
505 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
506 u16 w_length = le16_to_cpu(cr->wLength);
507 u16 w_index = le16_to_cpu(cr->wIndex);
508 u16 w_value = le16_to_cpu(cr->wValue);
509 u8 entity_id = (w_index >> 8) & 0xff;
510 u8 control_selector = w_value >> 8;
511 int value = -EOPNOTSUPP;
512
513 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
514 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
515 unsigned int is_playback = 0;
516
517 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
518 is_playback = 1;
519
520 if (control_selector == UAC_FU_MUTE) {
521 unsigned int mute;
522
523 u_audio_get_mute(audio, is_playback, &mute);
524
525 *(u8 *)req->buf = mute;
526 value = min_t(unsigned int, w_length, 1);
527 } else if (control_selector == UAC_FU_VOLUME) {
528 __le16 c;
529 s16 volume;
530
531 u_audio_get_volume(audio, is_playback, &volume);
532
533 c = cpu_to_le16(volume);
534
535 value = min_t(unsigned int, w_length, sizeof(c));
536 memcpy(req->buf, &c, value);
537 } else {
538 dev_err(&audio->gadget->dev,
539 "%s:%d control_selector=%d TODO!\n",
540 __func__, __LINE__, control_selector);
541 }
542 } else {
543 dev_err(&audio->gadget->dev,
544 "%s:%d entity_id=%d control_selector=%d TODO!\n",
545 __func__, __LINE__, entity_id, control_selector);
546 }
547
548 return value;
549}
550
551static int
552in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr)
553{
554 struct usb_request *req = fn->config->cdev->req;
555 struct g_audio *audio = func_to_g_audio(fn);
556 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
557 u16 w_length = le16_to_cpu(cr->wLength);
558 u16 w_index = le16_to_cpu(cr->wIndex);
559 u16 w_value = le16_to_cpu(cr->wValue);
560 u8 entity_id = (w_index >> 8) & 0xff;
561 u8 control_selector = w_value >> 8;
562 int value = -EOPNOTSUPP;
563
564 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
565 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
566 unsigned int is_playback = 0;
567
568 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
569 is_playback = 1;
570
571 if (control_selector == UAC_FU_VOLUME) {
572 __le16 r;
573 s16 min_db;
574
575 if (is_playback)
576 min_db = opts->p_volume_min;
577 else
578 min_db = opts->c_volume_min;
579
580 r = cpu_to_le16(min_db);
581
582 value = min_t(unsigned int, w_length, sizeof(r));
583 memcpy(req->buf, &r, value);
584 } else {
585 dev_err(&audio->gadget->dev,
586 "%s:%d control_selector=%d TODO!\n",
587 __func__, __LINE__, control_selector);
588 }
589 } else {
590 dev_err(&audio->gadget->dev,
591 "%s:%d entity_id=%d control_selector=%d TODO!\n",
592 __func__, __LINE__, entity_id, control_selector);
593 }
594
595 return value;
596}
597
598static int
599in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr)
600{
601 struct usb_request *req = fn->config->cdev->req;
602 struct g_audio *audio = func_to_g_audio(fn);
603 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
604 u16 w_length = le16_to_cpu(cr->wLength);
605 u16 w_index = le16_to_cpu(cr->wIndex);
606 u16 w_value = le16_to_cpu(cr->wValue);
607 u8 entity_id = (w_index >> 8) & 0xff;
608 u8 control_selector = w_value >> 8;
609 int value = -EOPNOTSUPP;
610
611 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
612 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
613 unsigned int is_playback = 0;
614
615 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
616 is_playback = 1;
617
618 if (control_selector == UAC_FU_VOLUME) {
619 __le16 r;
620 s16 max_db;
621
622 if (is_playback)
623 max_db = opts->p_volume_max;
624 else
625 max_db = opts->c_volume_max;
626
627 r = cpu_to_le16(max_db);
628
629 value = min_t(unsigned int, w_length, sizeof(r));
630 memcpy(req->buf, &r, value);
631 } else {
632 dev_err(&audio->gadget->dev,
633 "%s:%d control_selector=%d TODO!\n",
634 __func__, __LINE__, control_selector);
635 }
636 } else {
637 dev_err(&audio->gadget->dev,
638 "%s:%d entity_id=%d control_selector=%d TODO!\n",
639 __func__, __LINE__, entity_id, control_selector);
640 }
641
642 return value;
643}
644
645static int
646in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr)
647{
648 struct usb_request *req = fn->config->cdev->req;
649 struct g_audio *audio = func_to_g_audio(fn);
650 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
651 u16 w_length = le16_to_cpu(cr->wLength);
652 u16 w_index = le16_to_cpu(cr->wIndex);
653 u16 w_value = le16_to_cpu(cr->wValue);
654 u8 entity_id = (w_index >> 8) & 0xff;
655 u8 control_selector = w_value >> 8;
656 int value = -EOPNOTSUPP;
657
658 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
659 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
660 unsigned int is_playback = 0;
661
662 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
663 is_playback = 1;
664
665 if (control_selector == UAC_FU_VOLUME) {
666 __le16 r;
667 s16 res_db;
668
669 if (is_playback)
670 res_db = opts->p_volume_res;
671 else
672 res_db = opts->c_volume_res;
673
674 r = cpu_to_le16(res_db);
675
676 value = min_t(unsigned int, w_length, sizeof(r));
677 memcpy(req->buf, &r, value);
678 } else {
679 dev_err(&audio->gadget->dev,
680 "%s:%d control_selector=%d TODO!\n",
681 __func__, __LINE__, control_selector);
682 }
683 } else {
684 dev_err(&audio->gadget->dev,
685 "%s:%d entity_id=%d control_selector=%d TODO!\n",
686 __func__, __LINE__, entity_id, control_selector);
687 }
688
689 return value;
690}
691
692static void
693out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
694{
695 struct g_audio *audio = req->context;
696 struct usb_composite_dev *cdev = audio->func.config->cdev;
697 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
698 struct f_uac1 *uac1 = func_to_uac1(&audio->func);
699 struct usb_ctrlrequest *cr = &uac1->setup_cr;
700 u16 w_index = le16_to_cpu(cr->wIndex);
701 u16 w_value = le16_to_cpu(cr->wValue);
702 u8 entity_id = (w_index >> 8) & 0xff;
703 u8 control_selector = w_value >> 8;
704
705 if (req->status != 0) {
706 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
707 return;
708 }
709
710 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
711 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
712 unsigned int is_playback = 0;
713
714 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
715 is_playback = 1;
716
717 if (control_selector == UAC_FU_MUTE) {
718 u8 mute = *(u8 *)req->buf;
719
720 u_audio_set_mute(audio, is_playback, mute);
721
722 return;
723 } else if (control_selector == UAC_FU_VOLUME) {
724 __le16 *c = req->buf;
725 s16 volume;
726
727 volume = le16_to_cpu(*c);
728 u_audio_set_volume(audio, is_playback, volume);
729
730 return;
731 } else {
732 dev_err(&audio->gadget->dev,
733 "%s:%d control_selector=%d TODO!\n",
734 __func__, __LINE__, control_selector);
735 usb_ep_set_halt(ep);
736 }
737 } else {
738 dev_err(&audio->gadget->dev,
739 "%s:%d entity_id=%d control_selector=%d TODO!\n",
740 __func__, __LINE__, entity_id, control_selector);
741 usb_ep_set_halt(ep);
742
743 }
744}
745
746static int
747out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
748{
749 struct usb_request *req = fn->config->cdev->req;
750 struct g_audio *audio = func_to_g_audio(fn);
751 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
752 struct f_uac1 *uac1 = func_to_uac1(&audio->func);
753 u16 w_length = le16_to_cpu(cr->wLength);
754 u16 w_index = le16_to_cpu(cr->wIndex);
755 u16 w_value = le16_to_cpu(cr->wValue);
756 u8 entity_id = (w_index >> 8) & 0xff;
757 u8 control_selector = w_value >> 8;
758
759 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
760 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
761 memcpy(&uac1->setup_cr, cr, sizeof(*cr));
762 req->context = audio;
763 req->complete = out_rq_cur_complete;
764
765 return w_length;
766 } else {
767 dev_err(&audio->gadget->dev,
768 "%s:%d entity_id=%d control_selector=%d TODO!\n",
769 __func__, __LINE__, entity_id, control_selector);
770 }
771 return -EOPNOTSUPP;
772}
773
774static int ac_rq_in(struct usb_function *f,
775 const struct usb_ctrlrequest *ctrl)
776{
777 struct usb_composite_dev *cdev = f->config->cdev;
778 int value = -EOPNOTSUPP;
779 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
780 u16 len = le16_to_cpu(ctrl->wLength);
781 u16 w_value = le16_to_cpu(ctrl->wValue);
782
783 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
784 ctrl->bRequest, w_value, len, ep);
785
786 switch (ctrl->bRequest) {
787 case UAC_GET_CUR:
788 return in_rq_cur(f, ctrl);
789 case UAC_GET_MIN:
790 return in_rq_min(f, ctrl);
791 case UAC_GET_MAX:
792 return in_rq_max(f, ctrl);
793 case UAC_GET_RES:
794 return in_rq_res(f, ctrl);
795 case UAC_GET_MEM:
796 break;
797 case UAC_GET_STAT:
798 value = len;
799 break;
800 default:
801 break;
802 }
803
804 return value;
805}
806
807static int audio_set_endpoint_req(struct usb_function *f,
808 const struct usb_ctrlrequest *ctrl)
809{
810 struct usb_composite_dev *cdev = f->config->cdev;
811 struct usb_request *req = f->config->cdev->req;
812 struct f_uac1 *uac1 = func_to_uac1(f);
813 int value = -EOPNOTSUPP;
814 u16 ep = le16_to_cpu(ctrl->wIndex);
815 u16 len = le16_to_cpu(ctrl->wLength);
816 u16 w_value = le16_to_cpu(ctrl->wValue);
817 u8 cs = w_value >> 8;
818
819 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
820 ctrl->bRequest, w_value, len, ep);
821
822 switch (ctrl->bRequest) {
823 case UAC_SET_CUR: {
824 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
825 cdev->gadget->ep0->driver_data = f;
826 uac1->ctl_id = ep;
827 req->complete = uac_cs_attr_sample_rate;
828 }
829 value = len;
830 break;
831 }
832
833 case UAC_SET_MIN:
834 break;
835
836 case UAC_SET_MAX:
837 break;
838
839 case UAC_SET_RES:
840 break;
841
842 case UAC_SET_MEM:
843 break;
844
845 default:
846 break;
847 }
848
849 return value;
850}
851
852static int audio_get_endpoint_req(struct usb_function *f,
853 const struct usb_ctrlrequest *ctrl)
854{
855 struct usb_composite_dev *cdev = f->config->cdev;
856 struct usb_request *req = f->config->cdev->req;
857 struct f_uac1 *uac1 = func_to_uac1(f);
858 u8 *buf = (u8 *)req->buf;
859 int value = -EOPNOTSUPP;
860 u8 ep = le16_to_cpu(ctrl->wIndex);
861 u16 len = le16_to_cpu(ctrl->wLength);
862 u16 w_value = le16_to_cpu(ctrl->wValue);
863 u8 cs = w_value >> 8;
864 u32 val = 0;
865
866 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
867 ctrl->bRequest, w_value, len, ep);
868
869 switch (ctrl->bRequest) {
870 case UAC_GET_CUR: {
871 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
872 if (ep == (USB_DIR_IN | 2))
873 val = uac1->p_srate;
874 else if (ep == (USB_DIR_OUT | 1))
875 val = uac1->c_srate;
876 buf[2] = (val >> 16) & 0xff;
877 buf[1] = (val >> 8) & 0xff;
878 buf[0] = val & 0xff;
879 }
880 value = len;
881 break;
882 }
883 case UAC_GET_MIN:
884 case UAC_GET_MAX:
885 case UAC_GET_RES:
886 value = len;
887 break;
888 case UAC_GET_MEM:
889 break;
890 default:
891 break;
892 }
893
894 return value;
895}
896
897static int
898f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
899{
900 struct usb_composite_dev *cdev = f->config->cdev;
901 struct usb_request *req = cdev->req;
902 int value = -EOPNOTSUPP;
903 u16 w_index = le16_to_cpu(ctrl->wIndex);
904 u16 w_value = le16_to_cpu(ctrl->wValue);
905 u16 w_length = le16_to_cpu(ctrl->wLength);
906
907 /* composite driver infrastructure handles everything; interface
908 * activation uses set_alt().
909 */
910 switch (ctrl->bRequestType) {
911 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
912 value = audio_set_endpoint_req(f, ctrl);
913 break;
914
915 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
916 value = audio_get_endpoint_req(f, ctrl);
917 break;
918 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
919 if (ctrl->bRequest == UAC_SET_CUR)
920 value = out_rq_cur(f, ctrl);
921 break;
922 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
923 value = ac_rq_in(f, ctrl);
924 break;
925 default:
926 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
927 ctrl->bRequestType, ctrl->bRequest,
928 w_value, w_index, w_length);
929 }
930
931 /* respond with data transfer or status phase? */
932 if (value >= 0) {
933 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
934 ctrl->bRequestType, ctrl->bRequest,
935 w_value, w_index, w_length);
936 req->zero = 0;
937 req->length = value;
938 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
939 if (value < 0)
940 ERROR(cdev, "audio response on err %d\n", value);
941 }
942
943 /* device either stalls (value < 0) or reports success */
944 return value;
945}
946
947static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
948{
949 struct usb_composite_dev *cdev = f->config->cdev;
950 struct usb_gadget *gadget = cdev->gadget;
951 struct device *dev = &gadget->dev;
952 struct g_audio *audio = func_to_g_audio(f);
953 struct f_uac1 *uac1 = func_to_uac1(f);
954 int ret = 0;
955
956 /* No i/f has more than 2 alt settings */
957 if (alt > 1) {
958 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
959 return -EINVAL;
960 }
961
962 if (intf == uac1->ac_intf) {
963 /* Control I/f has only 1 AltSetting - 0 */
964 if (alt) {
965 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
966 return -EINVAL;
967 }
968
969 /* restart interrupt endpoint */
970 if (uac1->int_ep) {
971 usb_ep_disable(uac1->int_ep);
972 config_ep_by_speed(gadget, &audio->func, uac1->int_ep);
973 usb_ep_enable(uac1->int_ep);
974 }
975
976 return 0;
977 }
978
979 if (intf == uac1->as_out_intf) {
980 uac1->as_out_alt = alt;
981
982 if (alt)
983 ret = u_audio_start_capture(&uac1->g_audio);
984 else
985 u_audio_stop_capture(&uac1->g_audio);
986 } else if (intf == uac1->as_in_intf) {
987 uac1->as_in_alt = alt;
988
989 if (alt)
990 ret = u_audio_start_playback(&uac1->g_audio);
991 else
992 u_audio_stop_playback(&uac1->g_audio);
993 } else {
994 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
995 return -EINVAL;
996 }
997
998 return ret;
999}
1000
1001static int f_audio_get_alt(struct usb_function *f, unsigned intf)
1002{
1003 struct usb_composite_dev *cdev = f->config->cdev;
1004 struct usb_gadget *gadget = cdev->gadget;
1005 struct device *dev = &gadget->dev;
1006 struct f_uac1 *uac1 = func_to_uac1(f);
1007
1008 if (intf == uac1->ac_intf)
1009 return uac1->ac_alt;
1010 else if (intf == uac1->as_out_intf)
1011 return uac1->as_out_alt;
1012 else if (intf == uac1->as_in_intf)
1013 return uac1->as_in_alt;
1014 else
1015 dev_err(dev, "%s:%d Invalid Interface %d!\n",
1016 __func__, __LINE__, intf);
1017
1018 return -EINVAL;
1019}
1020
1021
1022static void f_audio_disable(struct usb_function *f)
1023{
1024 struct f_uac1 *uac1 = func_to_uac1(f);
1025
1026 uac1->as_out_alt = 0;
1027 uac1->as_in_alt = 0;
1028
1029 u_audio_stop_playback(&uac1->g_audio);
1030 u_audio_stop_capture(&uac1->g_audio);
1031 if (uac1->int_ep)
1032 usb_ep_disable(uac1->int_ep);
1033}
1034
1035static void
1036f_audio_suspend(struct usb_function *f)
1037{
1038 struct f_uac1 *uac1 = func_to_uac1(f);
1039
1040 u_audio_suspend(&uac1->g_audio);
1041}
1042
1043/*-------------------------------------------------------------------------*/
1044static struct uac_feature_unit_descriptor *build_fu_desc(int chmask)
1045{
1046 struct uac_feature_unit_descriptor *fu_desc;
1047 int channels = num_channels(chmask);
1048 int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels);
1049
1050 fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
1051 if (!fu_desc)
1052 return NULL;
1053
1054 fu_desc->bLength = fu_desc_size;
1055 fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1056
1057 fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
1058 fu_desc->bControlSize = 2;
1059
1060 /* bUnitID, bSourceID and bmaControls will be defined later */
1061
1062 return fu_desc;
1063}
1064
1065/* B.3.2 Class-Specific AC Interface Descriptor */
1066static struct
1067uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts)
1068{
1069 struct uac1_ac_header_descriptor *ac_desc;
1070 int ac_header_desc_size;
1071 int num_ifaces = 0;
1072
1073 if (EPOUT_EN(opts))
1074 num_ifaces++;
1075 if (EPIN_EN(opts))
1076 num_ifaces++;
1077
1078 ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces);
1079
1080 ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL);
1081 if (!ac_desc)
1082 return NULL;
1083
1084 ac_desc->bLength = ac_header_desc_size;
1085 ac_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1086 ac_desc->bDescriptorSubtype = UAC_HEADER;
1087 ac_desc->bcdADC = cpu_to_le16(0x0100);
1088 ac_desc->bInCollection = num_ifaces;
1089
1090 /* wTotalLength and baInterfaceNr will be defined later */
1091
1092 return ac_desc;
1093}
1094
1095/* Use macro to overcome line length limitation */
1096#define USBDHDR(p) (struct usb_descriptor_header *)(p)
1097
1098static void setup_descriptor(struct f_uac1_opts *opts)
1099{
1100 /* patch descriptors */
1101 int i = 1; /* ID's start with 1 */
1102
1103 if (EPOUT_EN(opts))
1104 usb_out_it_desc.bTerminalID = i++;
1105 if (EPIN_EN(opts))
1106 io_in_it_desc.bTerminalID = i++;
1107 if (EPOUT_EN(opts))
1108 io_out_ot_desc.bTerminalID = i++;
1109 if (EPIN_EN(opts))
1110 usb_in_ot_desc.bTerminalID = i++;
1111 if (FUOUT_EN(opts))
1112 out_feature_unit_desc->bUnitID = i++;
1113 if (FUIN_EN(opts))
1114 in_feature_unit_desc->bUnitID = i++;
1115
1116 if (FUIN_EN(opts)) {
1117 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
1118 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
1119 } else {
1120 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
1121 }
1122 if (FUOUT_EN(opts)) {
1123 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
1124 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
1125 } else {
1126 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
1127 }
1128
1129 as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
1130 as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
1131
1132 ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength);
1133
1134 if (EPIN_EN(opts)) {
1135 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1136
1137 len += sizeof(usb_in_ot_desc);
1138 len += sizeof(io_in_it_desc);
1139 if (FUIN_EN(opts))
1140 len += in_feature_unit_desc->bLength;
1141 ac_header_desc->wTotalLength = cpu_to_le16(len);
1142 }
1143 if (EPOUT_EN(opts)) {
1144 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1145
1146 len += sizeof(usb_out_it_desc);
1147 len += sizeof(io_out_ot_desc);
1148 if (FUOUT_EN(opts))
1149 len += out_feature_unit_desc->bLength;
1150 ac_header_desc->wTotalLength = cpu_to_le16(len);
1151 }
1152
1153 i = 0;
1154 f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
1155 f_audio_desc[i++] = USBDHDR(ac_header_desc);
1156
1157 if (EPOUT_EN(opts)) {
1158 f_audio_desc[i++] = USBDHDR(&usb_out_it_desc);
1159 f_audio_desc[i++] = USBDHDR(&io_out_ot_desc);
1160 if (FUOUT_EN(opts))
1161 f_audio_desc[i++] = USBDHDR(out_feature_unit_desc);
1162 }
1163
1164 if (EPIN_EN(opts)) {
1165 f_audio_desc[i++] = USBDHDR(&io_in_it_desc);
1166 f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc);
1167 if (FUIN_EN(opts))
1168 f_audio_desc[i++] = USBDHDR(in_feature_unit_desc);
1169 }
1170
1171 if (FUOUT_EN(opts) || FUIN_EN(opts))
1172 f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc);
1173
1174 if (EPOUT_EN(opts)) {
1175 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc);
1176 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc);
1177 f_audio_desc[i++] = USBDHDR(&as_out_header_desc);
1178 f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc);
1179 f_audio_desc[i++] = USBDHDR(&as_out_ep_desc);
1180 f_audio_desc[i++] = USBDHDR(&as_iso_out_desc);
1181 }
1182 if (EPIN_EN(opts)) {
1183 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc);
1184 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc);
1185 f_audio_desc[i++] = USBDHDR(&as_in_header_desc);
1186 f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc);
1187 f_audio_desc[i++] = USBDHDR(&as_in_ep_desc);
1188 f_audio_desc[i++] = USBDHDR(&as_iso_in_desc);
1189 }
1190 f_audio_desc[i] = NULL;
1191}
1192
1193static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
1194{
1195 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
1196
1197 if (!opts->p_chmask && !opts->c_chmask) {
1198 dev_err(dev, "Error: no playback and capture channels\n");
1199 return -EINVAL;
1200 } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
1201 dev_err(dev, "Error: unsupported playback channels mask\n");
1202 return -EINVAL;
1203 } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
1204 dev_err(dev, "Error: unsupported capture channels mask\n");
1205 return -EINVAL;
1206 } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
1207 dev_err(dev, "Error: incorrect playback sample size\n");
1208 return -EINVAL;
1209 } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
1210 dev_err(dev, "Error: incorrect capture sample size\n");
1211 return -EINVAL;
1212 } else if (!opts->p_srates[0]) {
1213 dev_err(dev, "Error: incorrect playback sampling rate\n");
1214 return -EINVAL;
1215 } else if (!opts->c_srates[0]) {
1216 dev_err(dev, "Error: incorrect capture sampling rate\n");
1217 return -EINVAL;
1218 }
1219
1220 if (opts->p_volume_max <= opts->p_volume_min) {
1221 dev_err(dev, "Error: incorrect playback volume max/min\n");
1222 return -EINVAL;
1223 } else if (opts->c_volume_max <= opts->c_volume_min) {
1224 dev_err(dev, "Error: incorrect capture volume max/min\n");
1225 return -EINVAL;
1226 } else if (opts->p_volume_res <= 0) {
1227 dev_err(dev, "Error: negative/zero playback volume resolution\n");
1228 return -EINVAL;
1229 } else if (opts->c_volume_res <= 0) {
1230 dev_err(dev, "Error: negative/zero capture volume resolution\n");
1231 return -EINVAL;
1232 }
1233
1234 if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
1235 dev_err(dev, "Error: incorrect playback volume resolution\n");
1236 return -EINVAL;
1237 } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
1238 dev_err(dev, "Error: incorrect capture volume resolution\n");
1239 return -EINVAL;
1240 }
1241
1242 return 0;
1243}
1244
1245/* audio function driver setup/binding */
1246static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
1247{
1248 struct usb_composite_dev *cdev = c->cdev;
1249 struct usb_gadget *gadget = cdev->gadget;
1250 struct device *dev = &gadget->dev;
1251 struct f_uac1 *uac1 = func_to_uac1(f);
1252 struct g_audio *audio = func_to_g_audio(f);
1253 struct f_uac1_opts *audio_opts;
1254 struct usb_ep *ep = NULL;
1255 struct usb_string *us;
1256 int ba_iface_id;
1257 int status;
1258 int idx, i;
1259
1260 status = f_audio_validate_opts(audio, dev);
1261 if (status)
1262 return status;
1263
1264 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1265
1266 strings_uac1[STR_AC_IF].s = audio_opts->function_name;
1267
1268 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
1269 if (IS_ERR(us))
1270 return PTR_ERR(us);
1271
1272 ac_header_desc = build_ac_header_desc(audio_opts);
1273 if (!ac_header_desc)
1274 return -ENOMEM;
1275
1276 if (FUOUT_EN(audio_opts)) {
1277 out_feature_unit_desc = build_fu_desc(audio_opts->c_chmask);
1278 if (!out_feature_unit_desc) {
1279 status = -ENOMEM;
1280 goto fail;
1281 }
1282 }
1283 if (FUIN_EN(audio_opts)) {
1284 in_feature_unit_desc = build_fu_desc(audio_opts->p_chmask);
1285 if (!in_feature_unit_desc) {
1286 status = -ENOMEM;
1287 goto err_free_fu;
1288 }
1289 }
1290
1291 ac_interface_desc.iInterface = us[STR_AC_IF].id;
1292 usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
1293 usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
1294 io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
1295 as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
1296 as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
1297 io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
1298 io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
1299 usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
1300 as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
1301 as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
1302
1303 if (FUOUT_EN(audio_opts)) {
1304 u8 *i_feature;
1305
1306 i_feature = (u8 *)out_feature_unit_desc +
1307 out_feature_unit_desc->bLength - 1;
1308 *i_feature = us[STR_FU_OUT].id;
1309 }
1310 if (FUIN_EN(audio_opts)) {
1311 u8 *i_feature;
1312
1313 i_feature = (u8 *)in_feature_unit_desc +
1314 in_feature_unit_desc->bLength - 1;
1315 *i_feature = us[STR_FU_IN].id;
1316 }
1317
1318 /* Set channel numbers */
1319 usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
1320 usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
1321 as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
1322 as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
1323 as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
1324 io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
1325 io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
1326 as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
1327 as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
1328 as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
1329
1330 if (FUOUT_EN(audio_opts)) {
1331 __le16 *bma = (__le16 *)&out_feature_unit_desc->bmaControls[0];
1332 u32 control = 0;
1333
1334 if (audio_opts->c_mute_present)
1335 control |= UAC_FU_MUTE;
1336 if (audio_opts->c_volume_present)
1337 control |= UAC_FU_VOLUME;
1338 *bma = cpu_to_le16(control);
1339 }
1340 if (FUIN_EN(audio_opts)) {
1341 __le16 *bma = (__le16 *)&in_feature_unit_desc->bmaControls[0];
1342 u32 control = 0;
1343
1344 if (audio_opts->p_mute_present)
1345 control |= UAC_FU_MUTE;
1346 if (audio_opts->p_volume_present)
1347 control |= UAC_FU_VOLUME;
1348 *bma = cpu_to_le16(control);
1349 }
1350
1351 /* Set sample rates */
1352 for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
1353 if (audio_opts->c_srates[i] == 0)
1354 break;
1355 memcpy(as_out_type_i_desc.tSamFreq[idx++],
1356 &audio_opts->c_srates[i], 3);
1357 }
1358 as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
1359 as_out_type_i_desc.bSamFreqType = idx;
1360
1361 for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
1362 if (audio_opts->p_srates[i] == 0)
1363 break;
1364 memcpy(as_in_type_i_desc.tSamFreq[idx++],
1365 &audio_opts->p_srates[i], 3);
1366 }
1367 as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
1368 as_in_type_i_desc.bSamFreqType = idx;
1369 uac1->p_srate = audio_opts->p_srates[0];
1370 uac1->c_srate = audio_opts->c_srates[0];
1371
1372 /* allocate instance-specific interface IDs, and patch descriptors */
1373 status = usb_interface_id(c, f);
1374 if (status < 0)
1375 goto err_free_fu;
1376 ac_interface_desc.bInterfaceNumber = status;
1377 uac1->ac_intf = status;
1378 uac1->ac_alt = 0;
1379
1380 ba_iface_id = 0;
1381
1382 if (EPOUT_EN(audio_opts)) {
1383 status = usb_interface_id(c, f);
1384 if (status < 0)
1385 goto err_free_fu;
1386 as_out_interface_alt_0_desc.bInterfaceNumber = status;
1387 as_out_interface_alt_1_desc.bInterfaceNumber = status;
1388 ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
1389 uac1->as_out_intf = status;
1390 uac1->as_out_alt = 0;
1391 }
1392
1393 if (EPIN_EN(audio_opts)) {
1394 status = usb_interface_id(c, f);
1395 if (status < 0)
1396 goto err_free_fu;
1397 as_in_interface_alt_0_desc.bInterfaceNumber = status;
1398 as_in_interface_alt_1_desc.bInterfaceNumber = status;
1399 ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
1400 uac1->as_in_intf = status;
1401 uac1->as_in_alt = 0;
1402 }
1403
1404 audio->gadget = gadget;
1405
1406 status = -ENODEV;
1407
1408 ac_interface_desc.bNumEndpoints = 0;
1409
1410 /* allocate AC interrupt endpoint */
1411 if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) {
1412 ep = usb_ep_autoconfig(cdev->gadget, &ac_int_ep_desc);
1413 if (!ep)
1414 goto err_free_fu;
1415 uac1->int_ep = ep;
1416 uac1->int_ep->desc = &ac_int_ep_desc;
1417
1418 ac_interface_desc.bNumEndpoints = 1;
1419 }
1420
1421 /* allocate instance-specific endpoints */
1422 if (EPOUT_EN(audio_opts)) {
1423 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
1424 if (!ep)
1425 goto err_free_fu;
1426 ss_as_out_ep_desc.bEndpointAddress = as_out_ep_desc.bEndpointAddress;
1427 audio->out_ep = ep;
1428 audio->out_ep->desc = &as_out_ep_desc;
1429 }
1430
1431 if (EPIN_EN(audio_opts)) {
1432 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
1433 if (!ep)
1434 goto err_free_fu;
1435 ss_as_in_ep_desc.bEndpointAddress = as_in_ep_desc.bEndpointAddress;
1436 audio->in_ep = ep;
1437 audio->in_ep->desc = &as_in_ep_desc;
1438 }
1439
1440 setup_descriptor(audio_opts);
1441
1442 /* copy descriptors, and track endpoint copies */
1443 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, f_audio_ss_desc,
1444 f_audio_ss_desc);
1445 if (status)
1446 goto err_free_fu;
1447
1448 audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
1449 audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
1450 audio->params.c_chmask = audio_opts->c_chmask;
1451 memcpy(audio->params.c_srates, audio_opts->c_srates,
1452 sizeof(audio->params.c_srates));
1453 audio->params.c_ssize = audio_opts->c_ssize;
1454 if (FUIN_EN(audio_opts)) {
1455 audio->params.p_fu.id = USB_IN_FU_ID;
1456 audio->params.p_fu.mute_present = audio_opts->p_mute_present;
1457 audio->params.p_fu.volume_present =
1458 audio_opts->p_volume_present;
1459 audio->params.p_fu.volume_min = audio_opts->p_volume_min;
1460 audio->params.p_fu.volume_max = audio_opts->p_volume_max;
1461 audio->params.p_fu.volume_res = audio_opts->p_volume_res;
1462 }
1463 audio->params.p_chmask = audio_opts->p_chmask;
1464 memcpy(audio->params.p_srates, audio_opts->p_srates,
1465 sizeof(audio->params.p_srates));
1466 audio->params.p_ssize = audio_opts->p_ssize;
1467 if (FUOUT_EN(audio_opts)) {
1468 audio->params.c_fu.id = USB_OUT_FU_ID;
1469 audio->params.c_fu.mute_present = audio_opts->c_mute_present;
1470 audio->params.c_fu.volume_present =
1471 audio_opts->c_volume_present;
1472 audio->params.c_fu.volume_min = audio_opts->c_volume_min;
1473 audio->params.c_fu.volume_max = audio_opts->c_volume_max;
1474 audio->params.c_fu.volume_res = audio_opts->c_volume_res;
1475 }
1476 audio->params.req_number = audio_opts->req_number;
1477 audio->params.fb_max = FBACK_FAST_MAX;
1478 if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts))
1479 audio->notify = audio_notify;
1480
1481 status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
1482 if (status)
1483 goto err_card_register;
1484
1485 return 0;
1486
1487err_card_register:
1488 usb_free_all_descriptors(f);
1489err_free_fu:
1490 kfree(out_feature_unit_desc);
1491 out_feature_unit_desc = NULL;
1492 kfree(in_feature_unit_desc);
1493 in_feature_unit_desc = NULL;
1494fail:
1495 kfree(ac_header_desc);
1496 ac_header_desc = NULL;
1497 return status;
1498}
1499
1500/*-------------------------------------------------------------------------*/
1501
1502static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
1503{
1504 return container_of(to_config_group(item), struct f_uac1_opts,
1505 func_inst.group);
1506}
1507
1508static void f_uac1_attr_release(struct config_item *item)
1509{
1510 struct f_uac1_opts *opts = to_f_uac1_opts(item);
1511
1512 usb_put_function_instance(&opts->func_inst);
1513}
1514
1515static struct configfs_item_operations f_uac1_item_ops = {
1516 .release = f_uac1_attr_release,
1517};
1518
1519#define uac1_kstrtou32 kstrtou32
1520#define uac1_kstrtos16 kstrtos16
1521#define uac1_kstrtobool(s, base, res) kstrtobool((s), (res))
1522
1523static const char *u32_fmt = "%u\n";
1524static const char *s16_fmt = "%hd\n";
1525static const char *bool_fmt = "%u\n";
1526
1527#define UAC1_ATTRIBUTE(type, name) \
1528static ssize_t f_uac1_opts_##name##_show( \
1529 struct config_item *item, \
1530 char *page) \
1531{ \
1532 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
1533 int result; \
1534 \
1535 mutex_lock(&opts->lock); \
1536 result = sprintf(page, type##_fmt, opts->name); \
1537 mutex_unlock(&opts->lock); \
1538 \
1539 return result; \
1540} \
1541 \
1542static ssize_t f_uac1_opts_##name##_store( \
1543 struct config_item *item, \
1544 const char *page, size_t len) \
1545{ \
1546 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
1547 int ret; \
1548 type num; \
1549 \
1550 mutex_lock(&opts->lock); \
1551 if (opts->refcnt) { \
1552 ret = -EBUSY; \
1553 goto end; \
1554 } \
1555 \
1556 ret = uac1_kstrto##type(page, 0, &num); \
1557 if (ret) \
1558 goto end; \
1559 \
1560 opts->name = num; \
1561 ret = len; \
1562 \
1563end: \
1564 mutex_unlock(&opts->lock); \
1565 return ret; \
1566} \
1567 \
1568CONFIGFS_ATTR(f_uac1_opts_, name)
1569
1570#define UAC1_RATE_ATTRIBUTE(name) \
1571static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
1572 char *page) \
1573{ \
1574 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
1575 int result = 0; \
1576 int i; \
1577 \
1578 mutex_lock(&opts->lock); \
1579 page[0] = '\0'; \
1580 for (i = 0; i < UAC_MAX_RATES; i++) { \
1581 if (opts->name##s[i] == 0) \
1582 break; \
1583 result += sprintf(page + strlen(page), "%u,", \
1584 opts->name##s[i]); \
1585 } \
1586 if (strlen(page) > 0) \
1587 page[strlen(page) - 1] = '\n'; \
1588 mutex_unlock(&opts->lock); \
1589 \
1590 return result; \
1591} \
1592 \
1593static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
1594 const char *page, size_t len) \
1595{ \
1596 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
1597 char *split_page = NULL; \
1598 int ret = -EINVAL; \
1599 char *token; \
1600 u32 num; \
1601 int i; \
1602 \
1603 mutex_lock(&opts->lock); \
1604 if (opts->refcnt) { \
1605 ret = -EBUSY; \
1606 goto end; \
1607 } \
1608 \
1609 i = 0; \
1610 memset(opts->name##s, 0x00, sizeof(opts->name##s)); \
1611 split_page = kstrdup(page, GFP_KERNEL); \
1612 while ((token = strsep(&split_page, ",")) != NULL) { \
1613 ret = kstrtou32(token, 0, &num); \
1614 if (ret) \
1615 goto end; \
1616 \
1617 opts->name##s[i++] = num; \
1618 ret = len; \
1619 }; \
1620 \
1621end: \
1622 kfree(split_page); \
1623 mutex_unlock(&opts->lock); \
1624 return ret; \
1625} \
1626 \
1627CONFIGFS_ATTR(f_uac1_opts_, name)
1628
1629#define UAC1_ATTRIBUTE_STRING(name) \
1630static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
1631 char *page) \
1632{ \
1633 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
1634 int result; \
1635 \
1636 mutex_lock(&opts->lock); \
1637 result = scnprintf(page, sizeof(opts->name), "%s", opts->name); \
1638 mutex_unlock(&opts->lock); \
1639 \
1640 return result; \
1641} \
1642 \
1643static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
1644 const char *page, size_t len) \
1645{ \
1646 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
1647 int ret = 0; \
1648 \
1649 mutex_lock(&opts->lock); \
1650 if (opts->refcnt) { \
1651 ret = -EBUSY; \
1652 goto end; \
1653 } \
1654 \
1655 ret = scnprintf(opts->name, min(sizeof(opts->name), len), \
1656 "%s", page); \
1657 \
1658end: \
1659 mutex_unlock(&opts->lock); \
1660 return ret; \
1661} \
1662 \
1663CONFIGFS_ATTR(f_uac1_opts_, name)
1664
1665UAC1_ATTRIBUTE(u32, c_chmask);
1666UAC1_RATE_ATTRIBUTE(c_srate);
1667UAC1_ATTRIBUTE(u32, c_ssize);
1668UAC1_ATTRIBUTE(u32, p_chmask);
1669UAC1_RATE_ATTRIBUTE(p_srate);
1670UAC1_ATTRIBUTE(u32, p_ssize);
1671UAC1_ATTRIBUTE(u32, req_number);
1672
1673UAC1_ATTRIBUTE(bool, p_mute_present);
1674UAC1_ATTRIBUTE(bool, p_volume_present);
1675UAC1_ATTRIBUTE(s16, p_volume_min);
1676UAC1_ATTRIBUTE(s16, p_volume_max);
1677UAC1_ATTRIBUTE(s16, p_volume_res);
1678
1679UAC1_ATTRIBUTE(bool, c_mute_present);
1680UAC1_ATTRIBUTE(bool, c_volume_present);
1681UAC1_ATTRIBUTE(s16, c_volume_min);
1682UAC1_ATTRIBUTE(s16, c_volume_max);
1683UAC1_ATTRIBUTE(s16, c_volume_res);
1684UAC1_ATTRIBUTE_STRING(function_name);
1685
1686static struct configfs_attribute *f_uac1_attrs[] = {
1687 &f_uac1_opts_attr_c_chmask,
1688 &f_uac1_opts_attr_c_srate,
1689 &f_uac1_opts_attr_c_ssize,
1690 &f_uac1_opts_attr_p_chmask,
1691 &f_uac1_opts_attr_p_srate,
1692 &f_uac1_opts_attr_p_ssize,
1693 &f_uac1_opts_attr_req_number,
1694
1695 &f_uac1_opts_attr_p_mute_present,
1696 &f_uac1_opts_attr_p_volume_present,
1697 &f_uac1_opts_attr_p_volume_min,
1698 &f_uac1_opts_attr_p_volume_max,
1699 &f_uac1_opts_attr_p_volume_res,
1700
1701 &f_uac1_opts_attr_c_mute_present,
1702 &f_uac1_opts_attr_c_volume_present,
1703 &f_uac1_opts_attr_c_volume_min,
1704 &f_uac1_opts_attr_c_volume_max,
1705 &f_uac1_opts_attr_c_volume_res,
1706
1707 &f_uac1_opts_attr_function_name,
1708
1709 NULL,
1710};
1711
1712static const struct config_item_type f_uac1_func_type = {
1713 .ct_item_ops = &f_uac1_item_ops,
1714 .ct_attrs = f_uac1_attrs,
1715 .ct_owner = THIS_MODULE,
1716};
1717
1718static void f_audio_free_inst(struct usb_function_instance *f)
1719{
1720 struct f_uac1_opts *opts;
1721
1722 opts = container_of(f, struct f_uac1_opts, func_inst);
1723 kfree(opts);
1724}
1725
1726static struct usb_function_instance *f_audio_alloc_inst(void)
1727{
1728 struct f_uac1_opts *opts;
1729
1730 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1731 if (!opts)
1732 return ERR_PTR(-ENOMEM);
1733
1734 mutex_init(&opts->lock);
1735 opts->func_inst.free_func_inst = f_audio_free_inst;
1736
1737 config_group_init_type_name(&opts->func_inst.group, "",
1738 &f_uac1_func_type);
1739
1740 opts->c_chmask = UAC1_DEF_CCHMASK;
1741 opts->c_srates[0] = UAC1_DEF_CSRATE;
1742 opts->c_ssize = UAC1_DEF_CSSIZE;
1743 opts->p_chmask = UAC1_DEF_PCHMASK;
1744 opts->p_srates[0] = UAC1_DEF_PSRATE;
1745 opts->p_ssize = UAC1_DEF_PSSIZE;
1746
1747 opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;
1748 opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT;
1749 opts->p_volume_min = UAC1_DEF_MIN_DB;
1750 opts->p_volume_max = UAC1_DEF_MAX_DB;
1751 opts->p_volume_res = UAC1_DEF_RES_DB;
1752
1753 opts->c_mute_present = UAC1_DEF_MUTE_PRESENT;
1754 opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT;
1755 opts->c_volume_min = UAC1_DEF_MIN_DB;
1756 opts->c_volume_max = UAC1_DEF_MAX_DB;
1757 opts->c_volume_res = UAC1_DEF_RES_DB;
1758
1759 opts->req_number = UAC1_DEF_REQ_NUM;
1760
1761 scnprintf(opts->function_name, sizeof(opts->function_name), "AC Interface");
1762
1763 return &opts->func_inst;
1764}
1765
1766static void f_audio_free(struct usb_function *f)
1767{
1768 struct g_audio *audio;
1769 struct f_uac1_opts *opts;
1770
1771 audio = func_to_g_audio(f);
1772 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1773 kfree(audio);
1774 mutex_lock(&opts->lock);
1775 --opts->refcnt;
1776 mutex_unlock(&opts->lock);
1777}
1778
1779static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
1780{
1781 struct g_audio *audio = func_to_g_audio(f);
1782
1783 g_audio_cleanup(audio);
1784 usb_free_all_descriptors(f);
1785
1786 kfree(out_feature_unit_desc);
1787 out_feature_unit_desc = NULL;
1788 kfree(in_feature_unit_desc);
1789 in_feature_unit_desc = NULL;
1790
1791 kfree(ac_header_desc);
1792 ac_header_desc = NULL;
1793
1794 audio->gadget = NULL;
1795}
1796
1797static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
1798{
1799 struct f_uac1 *uac1;
1800 struct f_uac1_opts *opts;
1801
1802 /* allocate and initialize one new instance */
1803 uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
1804 if (!uac1)
1805 return ERR_PTR(-ENOMEM);
1806
1807 opts = container_of(fi, struct f_uac1_opts, func_inst);
1808 mutex_lock(&opts->lock);
1809 ++opts->refcnt;
1810 mutex_unlock(&opts->lock);
1811
1812 uac1->g_audio.func.name = "uac1_func";
1813 uac1->g_audio.func.bind = f_audio_bind;
1814 uac1->g_audio.func.unbind = f_audio_unbind;
1815 uac1->g_audio.func.set_alt = f_audio_set_alt;
1816 uac1->g_audio.func.get_alt = f_audio_get_alt;
1817 uac1->g_audio.func.setup = f_audio_setup;
1818 uac1->g_audio.func.disable = f_audio_disable;
1819 uac1->g_audio.func.suspend = f_audio_suspend;
1820 uac1->g_audio.func.free_func = f_audio_free;
1821
1822 return &uac1->g_audio.func;
1823}
1824
1825DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
1826MODULE_LICENSE("GPL");
1827MODULE_AUTHOR("Ruslan Bilovol");