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 NUM_STR_DESCRIPTORS,
381};
382
383static struct usb_string strings_uac1[NUM_STR_DESCRIPTORS + 1] = {};
384
385static struct usb_gadget_strings str_uac1 = {
386 .language = 0x0409, /* en-us */
387 .strings = strings_uac1,
388};
389
390static struct usb_gadget_strings *uac1_strings[] = {
391 &str_uac1,
392 NULL,
393};
394
395/*
396 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
397 */
398
399static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
400{
401 struct usb_function *fn = ep->driver_data;
402 struct usb_composite_dev *cdev = fn->config->cdev;
403 struct g_audio *agdev = func_to_g_audio(f: fn);
404 struct f_uac1 *uac1 = func_to_uac1(f: fn);
405 u8 *buf = (u8 *)req->buf;
406 u32 val = 0;
407
408 if (req->actual != 3) {
409 WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
410 return;
411 }
412
413 val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
414 if (uac1->ctl_id == (USB_DIR_IN | 2)) {
415 uac1->p_srate = val;
416 u_audio_set_playback_srate(audio_dev: agdev, srate: uac1->p_srate);
417 } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
418 uac1->c_srate = val;
419 u_audio_set_capture_srate(audio_dev: agdev, srate: uac1->c_srate);
420 }
421}
422
423static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
424{
425 struct g_audio *audio = req->context;
426 struct f_uac1 *uac1 = func_to_uac1(f: &audio->func);
427
428 atomic_dec(v: &uac1->int_count);
429 kfree(objp: req->buf);
430 usb_ep_free_request(ep: _ep, req);
431}
432
433static int audio_notify(struct g_audio *audio, int unit_id, int cs)
434{
435 struct f_uac1 *uac1 = func_to_uac1(f: &audio->func);
436 struct usb_request *req;
437 struct uac1_status_word *msg;
438 int ret;
439
440 if (!uac1->int_ep->enabled)
441 return 0;
442
443 if (atomic_inc_return(v: &uac1->int_count) > UAC1_DEF_INT_REQ_NUM) {
444 atomic_dec(v: &uac1->int_count);
445 return 0;
446 }
447
448 req = usb_ep_alloc_request(ep: uac1->int_ep, GFP_ATOMIC);
449 if (req == NULL) {
450 ret = -ENOMEM;
451 goto err_dec_int_count;
452 }
453
454 msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
455 if (msg == NULL) {
456 ret = -ENOMEM;
457 goto err_free_request;
458 }
459
460 msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING
461 | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF;
462 msg->bOriginator = unit_id;
463
464 req->length = sizeof(*msg);
465 req->buf = msg;
466 req->context = audio;
467 req->complete = audio_notify_complete;
468
469 ret = usb_ep_queue(ep: uac1->int_ep, req, GFP_ATOMIC);
470
471 if (ret)
472 goto err_free_msg;
473
474 return 0;
475
476err_free_msg:
477 kfree(objp: msg);
478err_free_request:
479 usb_ep_free_request(ep: uac1->int_ep, req);
480err_dec_int_count:
481 atomic_dec(v: &uac1->int_count);
482
483 return ret;
484}
485
486static int
487in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
488{
489 struct usb_request *req = fn->config->cdev->req;
490 struct g_audio *audio = func_to_g_audio(f: fn);
491 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
492 u16 w_length = le16_to_cpu(cr->wLength);
493 u16 w_index = le16_to_cpu(cr->wIndex);
494 u16 w_value = le16_to_cpu(cr->wValue);
495 u8 entity_id = (w_index >> 8) & 0xff;
496 u8 control_selector = w_value >> 8;
497 int value = -EOPNOTSUPP;
498
499 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
500 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
501 unsigned int is_playback = 0;
502
503 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
504 is_playback = 1;
505
506 if (control_selector == UAC_FU_MUTE) {
507 unsigned int mute;
508
509 u_audio_get_mute(g_audio: audio, playback: is_playback, val: &mute);
510
511 *(u8 *)req->buf = mute;
512 value = min_t(unsigned int, w_length, 1);
513 } else if (control_selector == UAC_FU_VOLUME) {
514 __le16 c;
515 s16 volume;
516
517 u_audio_get_volume(g_audio: audio, playback: is_playback, val: &volume);
518
519 c = cpu_to_le16(volume);
520
521 value = min_t(unsigned int, w_length, sizeof(c));
522 memcpy(req->buf, &c, value);
523 } else {
524 dev_err(&audio->gadget->dev,
525 "%s:%d control_selector=%d TODO!\n",
526 __func__, __LINE__, control_selector);
527 }
528 } else {
529 dev_err(&audio->gadget->dev,
530 "%s:%d entity_id=%d control_selector=%d TODO!\n",
531 __func__, __LINE__, entity_id, control_selector);
532 }
533
534 return value;
535}
536
537static int
538in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr)
539{
540 struct usb_request *req = fn->config->cdev->req;
541 struct g_audio *audio = func_to_g_audio(f: fn);
542 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
543 u16 w_length = le16_to_cpu(cr->wLength);
544 u16 w_index = le16_to_cpu(cr->wIndex);
545 u16 w_value = le16_to_cpu(cr->wValue);
546 u8 entity_id = (w_index >> 8) & 0xff;
547 u8 control_selector = w_value >> 8;
548 int value = -EOPNOTSUPP;
549
550 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
551 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
552 unsigned int is_playback = 0;
553
554 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
555 is_playback = 1;
556
557 if (control_selector == UAC_FU_VOLUME) {
558 __le16 r;
559 s16 min_db;
560
561 if (is_playback)
562 min_db = opts->p_volume_min;
563 else
564 min_db = opts->c_volume_min;
565
566 r = cpu_to_le16(min_db);
567
568 value = min_t(unsigned int, w_length, sizeof(r));
569 memcpy(req->buf, &r, value);
570 } else {
571 dev_err(&audio->gadget->dev,
572 "%s:%d control_selector=%d TODO!\n",
573 __func__, __LINE__, control_selector);
574 }
575 } else {
576 dev_err(&audio->gadget->dev,
577 "%s:%d entity_id=%d control_selector=%d TODO!\n",
578 __func__, __LINE__, entity_id, control_selector);
579 }
580
581 return value;
582}
583
584static int
585in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr)
586{
587 struct usb_request *req = fn->config->cdev->req;
588 struct g_audio *audio = func_to_g_audio(f: fn);
589 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
590 u16 w_length = le16_to_cpu(cr->wLength);
591 u16 w_index = le16_to_cpu(cr->wIndex);
592 u16 w_value = le16_to_cpu(cr->wValue);
593 u8 entity_id = (w_index >> 8) & 0xff;
594 u8 control_selector = w_value >> 8;
595 int value = -EOPNOTSUPP;
596
597 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
598 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
599 unsigned int is_playback = 0;
600
601 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
602 is_playback = 1;
603
604 if (control_selector == UAC_FU_VOLUME) {
605 __le16 r;
606 s16 max_db;
607
608 if (is_playback)
609 max_db = opts->p_volume_max;
610 else
611 max_db = opts->c_volume_max;
612
613 r = cpu_to_le16(max_db);
614
615 value = min_t(unsigned int, w_length, sizeof(r));
616 memcpy(req->buf, &r, value);
617 } else {
618 dev_err(&audio->gadget->dev,
619 "%s:%d control_selector=%d TODO!\n",
620 __func__, __LINE__, control_selector);
621 }
622 } else {
623 dev_err(&audio->gadget->dev,
624 "%s:%d entity_id=%d control_selector=%d TODO!\n",
625 __func__, __LINE__, entity_id, control_selector);
626 }
627
628 return value;
629}
630
631static int
632in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr)
633{
634 struct usb_request *req = fn->config->cdev->req;
635 struct g_audio *audio = func_to_g_audio(f: fn);
636 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
637 u16 w_length = le16_to_cpu(cr->wLength);
638 u16 w_index = le16_to_cpu(cr->wIndex);
639 u16 w_value = le16_to_cpu(cr->wValue);
640 u8 entity_id = (w_index >> 8) & 0xff;
641 u8 control_selector = w_value >> 8;
642 int value = -EOPNOTSUPP;
643
644 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
645 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
646 unsigned int is_playback = 0;
647
648 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
649 is_playback = 1;
650
651 if (control_selector == UAC_FU_VOLUME) {
652 __le16 r;
653 s16 res_db;
654
655 if (is_playback)
656 res_db = opts->p_volume_res;
657 else
658 res_db = opts->c_volume_res;
659
660 r = cpu_to_le16(res_db);
661
662 value = min_t(unsigned int, w_length, sizeof(r));
663 memcpy(req->buf, &r, value);
664 } else {
665 dev_err(&audio->gadget->dev,
666 "%s:%d control_selector=%d TODO!\n",
667 __func__, __LINE__, control_selector);
668 }
669 } else {
670 dev_err(&audio->gadget->dev,
671 "%s:%d entity_id=%d control_selector=%d TODO!\n",
672 __func__, __LINE__, entity_id, control_selector);
673 }
674
675 return value;
676}
677
678static void
679out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
680{
681 struct g_audio *audio = req->context;
682 struct usb_composite_dev *cdev = audio->func.config->cdev;
683 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
684 struct f_uac1 *uac1 = func_to_uac1(f: &audio->func);
685 struct usb_ctrlrequest *cr = &uac1->setup_cr;
686 u16 w_index = le16_to_cpu(cr->wIndex);
687 u16 w_value = le16_to_cpu(cr->wValue);
688 u8 entity_id = (w_index >> 8) & 0xff;
689 u8 control_selector = w_value >> 8;
690
691 if (req->status != 0) {
692 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
693 return;
694 }
695
696 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
697 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
698 unsigned int is_playback = 0;
699
700 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
701 is_playback = 1;
702
703 if (control_selector == UAC_FU_MUTE) {
704 u8 mute = *(u8 *)req->buf;
705
706 u_audio_set_mute(g_audio: audio, playback: is_playback, val: mute);
707
708 return;
709 } else if (control_selector == UAC_FU_VOLUME) {
710 __le16 *c = req->buf;
711 s16 volume;
712
713 volume = le16_to_cpu(*c);
714 u_audio_set_volume(g_audio: audio, playback: is_playback, val: volume);
715
716 return;
717 } else {
718 dev_err(&audio->gadget->dev,
719 "%s:%d control_selector=%d TODO!\n",
720 __func__, __LINE__, control_selector);
721 usb_ep_set_halt(ep);
722 }
723 } else {
724 dev_err(&audio->gadget->dev,
725 "%s:%d entity_id=%d control_selector=%d TODO!\n",
726 __func__, __LINE__, entity_id, control_selector);
727 usb_ep_set_halt(ep);
728
729 }
730}
731
732static int
733out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
734{
735 struct usb_request *req = fn->config->cdev->req;
736 struct g_audio *audio = func_to_g_audio(f: fn);
737 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
738 struct f_uac1 *uac1 = func_to_uac1(f: &audio->func);
739 u16 w_length = le16_to_cpu(cr->wLength);
740 u16 w_index = le16_to_cpu(cr->wIndex);
741 u16 w_value = le16_to_cpu(cr->wValue);
742 u8 entity_id = (w_index >> 8) & 0xff;
743 u8 control_selector = w_value >> 8;
744
745 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
746 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
747 memcpy(&uac1->setup_cr, cr, sizeof(*cr));
748 req->context = audio;
749 req->complete = out_rq_cur_complete;
750
751 return w_length;
752 } else {
753 dev_err(&audio->gadget->dev,
754 "%s:%d entity_id=%d control_selector=%d TODO!\n",
755 __func__, __LINE__, entity_id, control_selector);
756 }
757 return -EOPNOTSUPP;
758}
759
760static int ac_rq_in(struct usb_function *f,
761 const struct usb_ctrlrequest *ctrl)
762{
763 struct usb_composite_dev *cdev = f->config->cdev;
764 int value = -EOPNOTSUPP;
765 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
766 u16 len = le16_to_cpu(ctrl->wLength);
767 u16 w_value = le16_to_cpu(ctrl->wValue);
768
769 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
770 ctrl->bRequest, w_value, len, ep);
771
772 switch (ctrl->bRequest) {
773 case UAC_GET_CUR:
774 return in_rq_cur(fn: f, cr: ctrl);
775 case UAC_GET_MIN:
776 return in_rq_min(fn: f, cr: ctrl);
777 case UAC_GET_MAX:
778 return in_rq_max(fn: f, cr: ctrl);
779 case UAC_GET_RES:
780 return in_rq_res(fn: f, cr: ctrl);
781 case UAC_GET_MEM:
782 break;
783 case UAC_GET_STAT:
784 value = len;
785 break;
786 default:
787 break;
788 }
789
790 return value;
791}
792
793static int audio_set_endpoint_req(struct usb_function *f,
794 const struct usb_ctrlrequest *ctrl)
795{
796 struct usb_composite_dev *cdev = f->config->cdev;
797 struct usb_request *req = f->config->cdev->req;
798 struct f_uac1 *uac1 = func_to_uac1(f);
799 int value = -EOPNOTSUPP;
800 u16 ep = le16_to_cpu(ctrl->wIndex);
801 u16 len = le16_to_cpu(ctrl->wLength);
802 u16 w_value = le16_to_cpu(ctrl->wValue);
803 u8 cs = w_value >> 8;
804
805 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
806 ctrl->bRequest, w_value, len, ep);
807
808 switch (ctrl->bRequest) {
809 case UAC_SET_CUR: {
810 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
811 cdev->gadget->ep0->driver_data = f;
812 uac1->ctl_id = ep;
813 req->complete = uac_cs_attr_sample_rate;
814 }
815 value = len;
816 break;
817 }
818
819 case UAC_SET_MIN:
820 break;
821
822 case UAC_SET_MAX:
823 break;
824
825 case UAC_SET_RES:
826 break;
827
828 case UAC_SET_MEM:
829 break;
830
831 default:
832 break;
833 }
834
835 return value;
836}
837
838static int audio_get_endpoint_req(struct usb_function *f,
839 const struct usb_ctrlrequest *ctrl)
840{
841 struct usb_composite_dev *cdev = f->config->cdev;
842 struct usb_request *req = f->config->cdev->req;
843 struct f_uac1 *uac1 = func_to_uac1(f);
844 u8 *buf = (u8 *)req->buf;
845 int value = -EOPNOTSUPP;
846 u8 ep = le16_to_cpu(ctrl->wIndex);
847 u16 len = le16_to_cpu(ctrl->wLength);
848 u16 w_value = le16_to_cpu(ctrl->wValue);
849 u8 cs = w_value >> 8;
850 u32 val = 0;
851
852 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
853 ctrl->bRequest, w_value, len, ep);
854
855 switch (ctrl->bRequest) {
856 case UAC_GET_CUR: {
857 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
858 if (ep == (USB_DIR_IN | 2))
859 val = uac1->p_srate;
860 else if (ep == (USB_DIR_OUT | 1))
861 val = uac1->c_srate;
862 buf[2] = (val >> 16) & 0xff;
863 buf[1] = (val >> 8) & 0xff;
864 buf[0] = val & 0xff;
865 }
866 value = len;
867 break;
868 }
869 case UAC_GET_MIN:
870 case UAC_GET_MAX:
871 case UAC_GET_RES:
872 value = len;
873 break;
874 case UAC_GET_MEM:
875 break;
876 default:
877 break;
878 }
879
880 return value;
881}
882
883static int
884f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
885{
886 struct usb_composite_dev *cdev = f->config->cdev;
887 struct usb_request *req = cdev->req;
888 int value = -EOPNOTSUPP;
889 u16 w_index = le16_to_cpu(ctrl->wIndex);
890 u16 w_value = le16_to_cpu(ctrl->wValue);
891 u16 w_length = le16_to_cpu(ctrl->wLength);
892
893 /* composite driver infrastructure handles everything; interface
894 * activation uses set_alt().
895 */
896 switch (ctrl->bRequestType) {
897 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
898 value = audio_set_endpoint_req(f, ctrl);
899 break;
900
901 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
902 value = audio_get_endpoint_req(f, ctrl);
903 break;
904 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
905 if (ctrl->bRequest == UAC_SET_CUR)
906 value = out_rq_cur(fn: f, cr: ctrl);
907 break;
908 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
909 value = ac_rq_in(f, ctrl);
910 break;
911 default:
912 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
913 ctrl->bRequestType, ctrl->bRequest,
914 w_value, w_index, w_length);
915 }
916
917 /* respond with data transfer or status phase? */
918 if (value >= 0) {
919 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
920 ctrl->bRequestType, ctrl->bRequest,
921 w_value, w_index, w_length);
922 req->zero = 0;
923 req->length = value;
924 value = usb_ep_queue(ep: cdev->gadget->ep0, req, GFP_ATOMIC);
925 if (value < 0)
926 ERROR(cdev, "audio response on err %d\n", value);
927 }
928
929 /* device either stalls (value < 0) or reports success */
930 return value;
931}
932
933static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
934{
935 struct usb_composite_dev *cdev = f->config->cdev;
936 struct usb_gadget *gadget = cdev->gadget;
937 struct device *dev = &gadget->dev;
938 struct g_audio *audio = func_to_g_audio(f);
939 struct f_uac1 *uac1 = func_to_uac1(f);
940 int ret = 0;
941
942 /* No i/f has more than 2 alt settings */
943 if (alt > 1) {
944 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
945 return -EINVAL;
946 }
947
948 if (intf == uac1->ac_intf) {
949 /* Control I/f has only 1 AltSetting - 0 */
950 if (alt) {
951 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
952 return -EINVAL;
953 }
954
955 /* restart interrupt endpoint */
956 if (uac1->int_ep) {
957 usb_ep_disable(ep: uac1->int_ep);
958 config_ep_by_speed(g: gadget, f: &audio->func, ep: uac1->int_ep);
959 usb_ep_enable(ep: uac1->int_ep);
960 }
961
962 return 0;
963 }
964
965 if (intf == uac1->as_out_intf) {
966 uac1->as_out_alt = alt;
967
968 if (alt)
969 ret = u_audio_start_capture(g_audio: &uac1->g_audio);
970 else
971 u_audio_stop_capture(g_audio: &uac1->g_audio);
972 } else if (intf == uac1->as_in_intf) {
973 uac1->as_in_alt = alt;
974
975 if (alt)
976 ret = u_audio_start_playback(g_audio: &uac1->g_audio);
977 else
978 u_audio_stop_playback(g_audio: &uac1->g_audio);
979 } else {
980 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
981 return -EINVAL;
982 }
983
984 return ret;
985}
986
987static int f_audio_get_alt(struct usb_function *f, unsigned intf)
988{
989 struct usb_composite_dev *cdev = f->config->cdev;
990 struct usb_gadget *gadget = cdev->gadget;
991 struct device *dev = &gadget->dev;
992 struct f_uac1 *uac1 = func_to_uac1(f);
993
994 if (intf == uac1->ac_intf)
995 return uac1->ac_alt;
996 else if (intf == uac1->as_out_intf)
997 return uac1->as_out_alt;
998 else if (intf == uac1->as_in_intf)
999 return uac1->as_in_alt;
1000 else
1001 dev_err(dev, "%s:%d Invalid Interface %d!\n",
1002 __func__, __LINE__, intf);
1003
1004 return -EINVAL;
1005}
1006
1007
1008static void f_audio_disable(struct usb_function *f)
1009{
1010 struct f_uac1 *uac1 = func_to_uac1(f);
1011
1012 uac1->as_out_alt = 0;
1013 uac1->as_in_alt = 0;
1014
1015 u_audio_stop_playback(g_audio: &uac1->g_audio);
1016 u_audio_stop_capture(g_audio: &uac1->g_audio);
1017 if (uac1->int_ep)
1018 usb_ep_disable(ep: uac1->int_ep);
1019}
1020
1021static void
1022f_audio_suspend(struct usb_function *f)
1023{
1024 struct f_uac1 *uac1 = func_to_uac1(f);
1025
1026 u_audio_suspend(g_audio: &uac1->g_audio);
1027}
1028
1029/*-------------------------------------------------------------------------*/
1030static struct uac_feature_unit_descriptor *build_fu_desc(int chmask)
1031{
1032 struct uac_feature_unit_descriptor *fu_desc;
1033 int channels = num_channels(chanmask: chmask);
1034 int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels);
1035
1036 fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
1037 if (!fu_desc)
1038 return NULL;
1039
1040 fu_desc->bLength = fu_desc_size;
1041 fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1042
1043 fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
1044 fu_desc->bControlSize = 2;
1045
1046 /* bUnitID, bSourceID and bmaControls will be defined later */
1047
1048 return fu_desc;
1049}
1050
1051/* B.3.2 Class-Specific AC Interface Descriptor */
1052static struct
1053uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts)
1054{
1055 struct uac1_ac_header_descriptor *ac_desc;
1056 int ac_header_desc_size;
1057 int num_ifaces = 0;
1058
1059 if (EPOUT_EN(opts))
1060 num_ifaces++;
1061 if (EPIN_EN(opts))
1062 num_ifaces++;
1063
1064 ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces);
1065
1066 ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL);
1067 if (!ac_desc)
1068 return NULL;
1069
1070 ac_desc->bLength = ac_header_desc_size;
1071 ac_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1072 ac_desc->bDescriptorSubtype = UAC_HEADER;
1073 ac_desc->bcdADC = cpu_to_le16(0x0100);
1074 ac_desc->bInCollection = num_ifaces;
1075
1076 /* wTotalLength and baInterfaceNr will be defined later */
1077
1078 return ac_desc;
1079}
1080
1081/* Use macro to overcome line length limitation */
1082#define USBDHDR(p) (struct usb_descriptor_header *)(p)
1083
1084static void setup_descriptor(struct f_uac1_opts *opts)
1085{
1086 /* patch descriptors */
1087 int i = 1; /* ID's start with 1 */
1088
1089 if (EPOUT_EN(opts))
1090 usb_out_it_desc.bTerminalID = i++;
1091 if (EPIN_EN(opts))
1092 io_in_it_desc.bTerminalID = i++;
1093 if (EPOUT_EN(opts))
1094 io_out_ot_desc.bTerminalID = i++;
1095 if (EPIN_EN(opts))
1096 usb_in_ot_desc.bTerminalID = i++;
1097 if (FUOUT_EN(opts))
1098 out_feature_unit_desc->bUnitID = i++;
1099 if (FUIN_EN(opts))
1100 in_feature_unit_desc->bUnitID = i++;
1101
1102 if (FUIN_EN(opts)) {
1103 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
1104 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
1105 } else {
1106 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
1107 }
1108 if (FUOUT_EN(opts)) {
1109 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
1110 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
1111 } else {
1112 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
1113 }
1114
1115 as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
1116 as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
1117
1118 ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength);
1119
1120 if (EPIN_EN(opts)) {
1121 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1122
1123 len += sizeof(usb_in_ot_desc);
1124 len += sizeof(io_in_it_desc);
1125 if (FUIN_EN(opts))
1126 len += in_feature_unit_desc->bLength;
1127 ac_header_desc->wTotalLength = cpu_to_le16(len);
1128 }
1129 if (EPOUT_EN(opts)) {
1130 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1131
1132 len += sizeof(usb_out_it_desc);
1133 len += sizeof(io_out_ot_desc);
1134 if (FUOUT_EN(opts))
1135 len += out_feature_unit_desc->bLength;
1136 ac_header_desc->wTotalLength = cpu_to_le16(len);
1137 }
1138
1139 i = 0;
1140 f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
1141 f_audio_desc[i++] = USBDHDR(ac_header_desc);
1142
1143 if (EPOUT_EN(opts)) {
1144 f_audio_desc[i++] = USBDHDR(&usb_out_it_desc);
1145 f_audio_desc[i++] = USBDHDR(&io_out_ot_desc);
1146 if (FUOUT_EN(opts))
1147 f_audio_desc[i++] = USBDHDR(out_feature_unit_desc);
1148 }
1149
1150 if (EPIN_EN(opts)) {
1151 f_audio_desc[i++] = USBDHDR(&io_in_it_desc);
1152 f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc);
1153 if (FUIN_EN(opts))
1154 f_audio_desc[i++] = USBDHDR(in_feature_unit_desc);
1155 }
1156
1157 if (FUOUT_EN(opts) || FUIN_EN(opts))
1158 f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc);
1159
1160 if (EPOUT_EN(opts)) {
1161 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc);
1162 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc);
1163 f_audio_desc[i++] = USBDHDR(&as_out_header_desc);
1164 f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc);
1165 f_audio_desc[i++] = USBDHDR(&as_out_ep_desc);
1166 f_audio_desc[i++] = USBDHDR(&as_iso_out_desc);
1167 }
1168 if (EPIN_EN(opts)) {
1169 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc);
1170 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc);
1171 f_audio_desc[i++] = USBDHDR(&as_in_header_desc);
1172 f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc);
1173 f_audio_desc[i++] = USBDHDR(&as_in_ep_desc);
1174 f_audio_desc[i++] = USBDHDR(&as_iso_in_desc);
1175 }
1176 f_audio_desc[i] = NULL;
1177}
1178
1179static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
1180{
1181 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
1182
1183 if (!opts->p_chmask && !opts->c_chmask) {
1184 dev_err(dev, "Error: no playback and capture channels\n");
1185 return -EINVAL;
1186 } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
1187 dev_err(dev, "Error: unsupported playback channels mask\n");
1188 return -EINVAL;
1189 } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
1190 dev_err(dev, "Error: unsupported capture channels mask\n");
1191 return -EINVAL;
1192 } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
1193 dev_err(dev, "Error: incorrect playback sample size\n");
1194 return -EINVAL;
1195 } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
1196 dev_err(dev, "Error: incorrect capture sample size\n");
1197 return -EINVAL;
1198 } else if (!opts->p_srates[0]) {
1199 dev_err(dev, "Error: incorrect playback sampling rate\n");
1200 return -EINVAL;
1201 } else if (!opts->c_srates[0]) {
1202 dev_err(dev, "Error: incorrect capture sampling rate\n");
1203 return -EINVAL;
1204 }
1205
1206 if (opts->p_volume_max <= opts->p_volume_min) {
1207 dev_err(dev, "Error: incorrect playback volume max/min\n");
1208 return -EINVAL;
1209 } else if (opts->c_volume_max <= opts->c_volume_min) {
1210 dev_err(dev, "Error: incorrect capture volume max/min\n");
1211 return -EINVAL;
1212 } else if (opts->p_volume_res <= 0) {
1213 dev_err(dev, "Error: negative/zero playback volume resolution\n");
1214 return -EINVAL;
1215 } else if (opts->c_volume_res <= 0) {
1216 dev_err(dev, "Error: negative/zero capture volume resolution\n");
1217 return -EINVAL;
1218 }
1219
1220 if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
1221 dev_err(dev, "Error: incorrect playback volume resolution\n");
1222 return -EINVAL;
1223 } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
1224 dev_err(dev, "Error: incorrect capture volume resolution\n");
1225 return -EINVAL;
1226 }
1227
1228 return 0;
1229}
1230
1231/* audio function driver setup/binding */
1232static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
1233{
1234 struct usb_composite_dev *cdev = c->cdev;
1235 struct usb_gadget *gadget = cdev->gadget;
1236 struct device *dev = &gadget->dev;
1237 struct f_uac1 *uac1 = func_to_uac1(f);
1238 struct g_audio *audio = func_to_g_audio(f);
1239 struct f_uac1_opts *audio_opts;
1240 struct usb_ep *ep = NULL;
1241 struct usb_string *us;
1242 int ba_iface_id;
1243 int status;
1244 int idx, i;
1245
1246 status = f_audio_validate_opts(audio, dev);
1247 if (status)
1248 return status;
1249
1250 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1251
1252 strings_uac1[STR_AC_IF].s = audio_opts->function_name;
1253
1254 strings_uac1[STR_USB_OUT_IT].s = audio_opts->c_it_name;
1255 strings_uac1[STR_USB_OUT_IT_CH_NAMES].s = audio_opts->c_it_ch_name;
1256 strings_uac1[STR_IO_OUT_OT].s = audio_opts->c_ot_name;
1257 strings_uac1[STR_FU_OUT].s = audio_opts->c_fu_vol_name;
1258 strings_uac1[STR_AS_OUT_IF_ALT0].s = "Playback Inactive";
1259 strings_uac1[STR_AS_OUT_IF_ALT1].s = "Playback Active";
1260
1261 strings_uac1[STR_IO_IN_IT].s = audio_opts->p_it_name;
1262 strings_uac1[STR_IO_IN_IT_CH_NAMES].s = audio_opts->p_it_ch_name;
1263 strings_uac1[STR_USB_IN_OT].s = audio_opts->p_ot_name;
1264 strings_uac1[STR_FU_IN].s = audio_opts->p_fu_vol_name;
1265 strings_uac1[STR_AS_IN_IF_ALT0].s = "Capture Inactive";
1266 strings_uac1[STR_AS_IN_IF_ALT1].s = "Capture Active";
1267
1268 us = usb_gstrings_attach(cdev, sp: uac1_strings, ARRAY_SIZE(strings_uac1));
1269 if (IS_ERR(ptr: us))
1270 return PTR_ERR(ptr: us);
1271
1272 ac_header_desc = build_ac_header_desc(opts: 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(chmask: 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(chmask: 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(chanmask: 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(chanmask: 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(chanmask: 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(chanmask: 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, fs: f_audio_desc, hs: f_audio_desc, ss: f_audio_ss_desc,
1444 ssp: 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(g_audio: audio, pcm_name: "UAC1_PCM", card_name: "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(objp: out_feature_unit_desc);
1491 out_feature_unit_desc = NULL;
1492 kfree(objp: in_feature_unit_desc);
1493 in_feature_unit_desc = NULL;
1494fail:
1495 kfree(objp: 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(fi: &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 = sysfs_emit(page, "%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);
1684
1685UAC1_ATTRIBUTE_STRING(function_name);
1686
1687UAC1_ATTRIBUTE_STRING(p_it_name);
1688UAC1_ATTRIBUTE_STRING(p_it_ch_name);
1689UAC1_ATTRIBUTE_STRING(p_ot_name);
1690UAC1_ATTRIBUTE_STRING(p_fu_vol_name);
1691
1692UAC1_ATTRIBUTE_STRING(c_it_name);
1693UAC1_ATTRIBUTE_STRING(c_it_ch_name);
1694UAC1_ATTRIBUTE_STRING(c_ot_name);
1695UAC1_ATTRIBUTE_STRING(c_fu_vol_name);
1696
1697static struct configfs_attribute *f_uac1_attrs[] = {
1698 &f_uac1_opts_attr_c_chmask,
1699 &f_uac1_opts_attr_c_srate,
1700 &f_uac1_opts_attr_c_ssize,
1701 &f_uac1_opts_attr_p_chmask,
1702 &f_uac1_opts_attr_p_srate,
1703 &f_uac1_opts_attr_p_ssize,
1704 &f_uac1_opts_attr_req_number,
1705
1706 &f_uac1_opts_attr_p_mute_present,
1707 &f_uac1_opts_attr_p_volume_present,
1708 &f_uac1_opts_attr_p_volume_min,
1709 &f_uac1_opts_attr_p_volume_max,
1710 &f_uac1_opts_attr_p_volume_res,
1711
1712 &f_uac1_opts_attr_c_mute_present,
1713 &f_uac1_opts_attr_c_volume_present,
1714 &f_uac1_opts_attr_c_volume_min,
1715 &f_uac1_opts_attr_c_volume_max,
1716 &f_uac1_opts_attr_c_volume_res,
1717
1718 &f_uac1_opts_attr_function_name,
1719
1720 &f_uac1_opts_attr_p_it_name,
1721 &f_uac1_opts_attr_p_it_ch_name,
1722 &f_uac1_opts_attr_p_ot_name,
1723 &f_uac1_opts_attr_p_fu_vol_name,
1724
1725 &f_uac1_opts_attr_c_it_name,
1726 &f_uac1_opts_attr_c_it_ch_name,
1727 &f_uac1_opts_attr_c_ot_name,
1728 &f_uac1_opts_attr_c_fu_vol_name,
1729
1730 NULL,
1731};
1732
1733static const struct config_item_type f_uac1_func_type = {
1734 .ct_item_ops = &f_uac1_item_ops,
1735 .ct_attrs = f_uac1_attrs,
1736 .ct_owner = THIS_MODULE,
1737};
1738
1739static void f_audio_free_inst(struct usb_function_instance *f)
1740{
1741 struct f_uac1_opts *opts;
1742
1743 opts = container_of(f, struct f_uac1_opts, func_inst);
1744 kfree(objp: opts);
1745}
1746
1747static struct usb_function_instance *f_audio_alloc_inst(void)
1748{
1749 struct f_uac1_opts *opts;
1750
1751 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1752 if (!opts)
1753 return ERR_PTR(error: -ENOMEM);
1754
1755 mutex_init(&opts->lock);
1756 opts->func_inst.free_func_inst = f_audio_free_inst;
1757
1758 config_group_init_type_name(group: &opts->func_inst.group, name: "",
1759 type: &f_uac1_func_type);
1760
1761 opts->c_chmask = UAC1_DEF_CCHMASK;
1762 opts->c_srates[0] = UAC1_DEF_CSRATE;
1763 opts->c_ssize = UAC1_DEF_CSSIZE;
1764 opts->p_chmask = UAC1_DEF_PCHMASK;
1765 opts->p_srates[0] = UAC1_DEF_PSRATE;
1766 opts->p_ssize = UAC1_DEF_PSSIZE;
1767
1768 opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;
1769 opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT;
1770 opts->p_volume_min = UAC1_DEF_MIN_DB;
1771 opts->p_volume_max = UAC1_DEF_MAX_DB;
1772 opts->p_volume_res = UAC1_DEF_RES_DB;
1773
1774 opts->c_mute_present = UAC1_DEF_MUTE_PRESENT;
1775 opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT;
1776 opts->c_volume_min = UAC1_DEF_MIN_DB;
1777 opts->c_volume_max = UAC1_DEF_MAX_DB;
1778 opts->c_volume_res = UAC1_DEF_RES_DB;
1779
1780 opts->req_number = UAC1_DEF_REQ_NUM;
1781
1782 scnprintf(buf: opts->function_name, size: sizeof(opts->function_name), fmt: "AC Interface");
1783
1784 scnprintf(buf: opts->p_it_name, size: sizeof(opts->p_it_name), fmt: "Capture Input terminal");
1785 scnprintf(buf: opts->p_it_ch_name, size: sizeof(opts->p_it_ch_name), fmt: "Capture Channels");
1786 scnprintf(buf: opts->p_ot_name, size: sizeof(opts->p_ot_name), fmt: "Capture Output terminal");
1787 scnprintf(buf: opts->p_fu_vol_name, size: sizeof(opts->p_fu_vol_name), fmt: "Capture Volume");
1788
1789 scnprintf(buf: opts->c_it_name, size: sizeof(opts->c_it_name), fmt: "Playback Input terminal");
1790 scnprintf(buf: opts->c_it_ch_name, size: sizeof(opts->c_it_ch_name), fmt: "Playback Channels");
1791 scnprintf(buf: opts->c_ot_name, size: sizeof(opts->c_ot_name), fmt: "Playback Output terminal");
1792 scnprintf(buf: opts->c_fu_vol_name, size: sizeof(opts->c_fu_vol_name), fmt: "Playback Volume");
1793
1794 return &opts->func_inst;
1795}
1796
1797static void f_audio_free(struct usb_function *f)
1798{
1799 struct g_audio *audio;
1800 struct f_uac1_opts *opts;
1801
1802 audio = func_to_g_audio(f);
1803 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1804 kfree(objp: audio);
1805 mutex_lock(&opts->lock);
1806 --opts->refcnt;
1807 mutex_unlock(lock: &opts->lock);
1808}
1809
1810static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
1811{
1812 struct g_audio *audio = func_to_g_audio(f);
1813
1814 g_audio_cleanup(g_audio: audio);
1815 usb_free_all_descriptors(f);
1816
1817 kfree(objp: out_feature_unit_desc);
1818 out_feature_unit_desc = NULL;
1819 kfree(objp: in_feature_unit_desc);
1820 in_feature_unit_desc = NULL;
1821
1822 kfree(objp: ac_header_desc);
1823 ac_header_desc = NULL;
1824
1825 audio->gadget = NULL;
1826}
1827
1828static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
1829{
1830 struct f_uac1 *uac1;
1831 struct f_uac1_opts *opts;
1832
1833 /* allocate and initialize one new instance */
1834 uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
1835 if (!uac1)
1836 return ERR_PTR(error: -ENOMEM);
1837
1838 opts = container_of(fi, struct f_uac1_opts, func_inst);
1839 mutex_lock(&opts->lock);
1840 ++opts->refcnt;
1841 mutex_unlock(lock: &opts->lock);
1842
1843 uac1->g_audio.func.name = "uac1_func";
1844 uac1->g_audio.func.bind = f_audio_bind;
1845 uac1->g_audio.func.unbind = f_audio_unbind;
1846 uac1->g_audio.func.set_alt = f_audio_set_alt;
1847 uac1->g_audio.func.get_alt = f_audio_get_alt;
1848 uac1->g_audio.func.setup = f_audio_setup;
1849 uac1->g_audio.func.disable = f_audio_disable;
1850 uac1->g_audio.func.suspend = f_audio_suspend;
1851 uac1->g_audio.func.free_func = f_audio_free;
1852
1853 return &uac1->g_audio.func;
1854}
1855
1856DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
1857MODULE_DESCRIPTION("USB Audio Class 1.0 Function (using u_audio API)");
1858MODULE_LICENSE("GPL");
1859MODULE_AUTHOR("Ruslan Bilovol");
1860

source code of linux/drivers/usb/gadget/function/f_uac1.c