1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * f_uac2.c -- USB Audio Class 2.0 Function
4 *
5 * Copyright (C) 2011
6 * Yadwinder Singh (yadi.brar01@gmail.com)
7 * Jaswinder Singh (jaswinder.singh@linaro.org)
8 *
9 * Copyright (C) 2020
10 * Ruslan Bilovol (ruslan.bilovol@gmail.com)
11 */
12
13#include <linux/usb/audio.h>
14#include <linux/usb/audio-v2.h>
15#include <linux/module.h>
16
17#include "u_audio.h"
18
19#include "u_uac2.h"
20
21/* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
22#define UAC2_CHANNEL_MASK 0x07FFFFFF
23
24/*
25 * The driver implements a simple UAC_2 topology.
26 * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
27 * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
28 * Capture and Playback sampling rates are independently
29 * controlled by two clock sources :
30 * CLK_5 := c_srate, and CLK_6 := p_srate
31 */
32#define USB_OUT_CLK_ID (out_clk_src_desc.bClockID)
33#define USB_IN_CLK_ID (in_clk_src_desc.bClockID)
34#define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID)
35#define USB_IN_FU_ID (in_feature_unit_desc->bUnitID)
36
37#define CONTROL_ABSENT 0
38#define CONTROL_RDONLY 1
39#define CONTROL_RDWR 3
40
41#define CLK_FREQ_CTRL 0
42#define CLK_VLD_CTRL 2
43#define FU_MUTE_CTRL 0
44#define FU_VOL_CTRL 2
45
46#define COPY_CTRL 0
47#define CONN_CTRL 2
48#define OVRLD_CTRL 4
49#define CLSTR_CTRL 6
50#define UNFLW_CTRL 8
51#define OVFLW_CTRL 10
52
53#define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
54#define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
55#define FUIN_EN(_opts) (EPIN_EN(_opts) \
56 && ((_opts)->p_mute_present \
57 || (_opts)->p_volume_present))
58#define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
59 && ((_opts)->c_mute_present \
60 || (_opts)->c_volume_present))
61#define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
62
63struct f_uac2 {
64 struct g_audio g_audio;
65 u8 ac_intf, as_in_intf, as_out_intf;
66 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
67
68 struct usb_ctrlrequest setup_cr; /* will be used in data stage */
69
70 /* Interrupt IN endpoint of AC interface */
71 struct usb_ep *int_ep;
72 atomic_t int_count;
73 /* transient state, only valid during handling of a single control request */
74 int clock_id;
75};
76
77static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
78{
79 return container_of(f, struct f_uac2, g_audio.func);
80}
81
82static inline
83struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
84{
85 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
86}
87
88static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
89
90/* --------- USB Function Interface ------------- */
91
92enum {
93 STR_ASSOC,
94 STR_IF_CTRL,
95 STR_CLKSRC_IN,
96 STR_CLKSRC_OUT,
97 STR_USB_IT,
98 STR_USB_IT_CH,
99 STR_IO_IT,
100 STR_IO_IT_CH,
101 STR_USB_OT,
102 STR_IO_OT,
103 STR_FU_IN,
104 STR_FU_OUT,
105 STR_AS_OUT_ALT0,
106 STR_AS_OUT_ALT1,
107 STR_AS_IN_ALT0,
108 STR_AS_IN_ALT1,
109 NUM_STR_DESCRIPTORS,
110};
111
112static struct usb_string strings_fn[NUM_STR_DESCRIPTORS + 1] = {};
113
114static const char *const speed_names[] = {
115 [USB_SPEED_UNKNOWN] = "UNKNOWN",
116 [USB_SPEED_LOW] = "LS",
117 [USB_SPEED_FULL] = "FS",
118 [USB_SPEED_HIGH] = "HS",
119 [USB_SPEED_WIRELESS] = "W",
120 [USB_SPEED_SUPER] = "SS",
121 [USB_SPEED_SUPER_PLUS] = "SS+",
122};
123
124static struct usb_gadget_strings str_fn = {
125 .language = 0x0409, /* en-us */
126 .strings = strings_fn,
127};
128
129static struct usb_gadget_strings *fn_strings[] = {
130 &str_fn,
131 NULL,
132};
133
134static struct usb_interface_assoc_descriptor iad_desc = {
135 .bLength = sizeof iad_desc,
136 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
137
138 .bFirstInterface = 0,
139 .bInterfaceCount = 3,
140 .bFunctionClass = USB_CLASS_AUDIO,
141 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
142 .bFunctionProtocol = UAC_VERSION_2,
143};
144
145/* Audio Control Interface */
146static struct usb_interface_descriptor std_ac_if_desc = {
147 .bLength = sizeof std_ac_if_desc,
148 .bDescriptorType = USB_DT_INTERFACE,
149
150 .bAlternateSetting = 0,
151 /* .bNumEndpoints = DYNAMIC */
152 .bInterfaceClass = USB_CLASS_AUDIO,
153 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
154 .bInterfaceProtocol = UAC_VERSION_2,
155};
156
157/* Clock source for IN traffic */
158static struct uac_clock_source_descriptor in_clk_src_desc = {
159 .bLength = sizeof in_clk_src_desc,
160 .bDescriptorType = USB_DT_CS_INTERFACE,
161
162 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
163 /* .bClockID = DYNAMIC */
164 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
165 .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
166 .bAssocTerminal = 0,
167};
168
169/* Clock source for OUT traffic */
170static struct uac_clock_source_descriptor out_clk_src_desc = {
171 .bLength = sizeof out_clk_src_desc,
172 .bDescriptorType = USB_DT_CS_INTERFACE,
173
174 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
175 /* .bClockID = DYNAMIC */
176 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
177 .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
178 .bAssocTerminal = 0,
179};
180
181/* Input Terminal for USB_OUT */
182static struct uac2_input_terminal_descriptor usb_out_it_desc = {
183 .bLength = sizeof usb_out_it_desc,
184 .bDescriptorType = USB_DT_CS_INTERFACE,
185
186 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
187 /* .bTerminalID = DYNAMIC */
188 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
189 .bAssocTerminal = 0,
190 /* .bCSourceID = DYNAMIC */
191 .iChannelNames = 0,
192 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
193};
194
195/* Input Terminal for I/O-In */
196static struct uac2_input_terminal_descriptor io_in_it_desc = {
197 .bLength = sizeof io_in_it_desc,
198 .bDescriptorType = USB_DT_CS_INTERFACE,
199
200 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
201 /* .bTerminalID = DYNAMIC */
202 /* .wTerminalType = DYNAMIC */
203 .bAssocTerminal = 0,
204 /* .bCSourceID = DYNAMIC */
205 .iChannelNames = 0,
206 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
207};
208
209/* Ouput Terminal for USB_IN */
210static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
211 .bLength = sizeof usb_in_ot_desc,
212 .bDescriptorType = USB_DT_CS_INTERFACE,
213
214 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
215 /* .bTerminalID = DYNAMIC */
216 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
217 .bAssocTerminal = 0,
218 /* .bSourceID = DYNAMIC */
219 /* .bCSourceID = DYNAMIC */
220 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
221};
222
223/* Ouput Terminal for I/O-Out */
224static struct uac2_output_terminal_descriptor io_out_ot_desc = {
225 .bLength = sizeof io_out_ot_desc,
226 .bDescriptorType = USB_DT_CS_INTERFACE,
227
228 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
229 /* .bTerminalID = DYNAMIC */
230 /* .wTerminalType = DYNAMIC */
231 .bAssocTerminal = 0,
232 /* .bSourceID = DYNAMIC */
233 /* .bCSourceID = DYNAMIC */
234 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
235};
236
237static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
238static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
239
240static struct uac2_ac_header_descriptor ac_hdr_desc = {
241 .bLength = sizeof ac_hdr_desc,
242 .bDescriptorType = USB_DT_CS_INTERFACE,
243
244 .bDescriptorSubtype = UAC_MS_HEADER,
245 .bcdADC = cpu_to_le16(0x200),
246 .bCategory = UAC2_FUNCTION_IO_BOX,
247 /* .wTotalLength = DYNAMIC */
248 .bmControls = 0,
249};
250
251/* AC IN Interrupt Endpoint */
252static struct usb_endpoint_descriptor fs_ep_int_desc = {
253 .bLength = USB_DT_ENDPOINT_SIZE,
254 .bDescriptorType = USB_DT_ENDPOINT,
255
256 .bEndpointAddress = USB_DIR_IN,
257 .bmAttributes = USB_ENDPOINT_XFER_INT,
258 .wMaxPacketSize = cpu_to_le16(6),
259 .bInterval = 1,
260};
261
262static struct usb_endpoint_descriptor hs_ep_int_desc = {
263 .bLength = USB_DT_ENDPOINT_SIZE,
264 .bDescriptorType = USB_DT_ENDPOINT,
265
266 .bmAttributes = USB_ENDPOINT_XFER_INT,
267 .wMaxPacketSize = cpu_to_le16(6),
268 .bInterval = 4,
269};
270
271static struct usb_endpoint_descriptor ss_ep_int_desc = {
272 .bLength = USB_DT_ENDPOINT_SIZE,
273 .bDescriptorType = USB_DT_ENDPOINT,
274
275 .bEndpointAddress = USB_DIR_IN,
276 .bmAttributes = USB_ENDPOINT_XFER_INT,
277 .wMaxPacketSize = cpu_to_le16(6),
278 .bInterval = 4,
279};
280
281static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
282 .bLength = sizeof(ss_ep_int_desc_comp),
283 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
284 .wBytesPerInterval = cpu_to_le16(6),
285};
286
287/* Audio Streaming OUT Interface - Alt0 */
288static struct usb_interface_descriptor std_as_out_if0_desc = {
289 .bLength = sizeof std_as_out_if0_desc,
290 .bDescriptorType = USB_DT_INTERFACE,
291
292 .bAlternateSetting = 0,
293 .bNumEndpoints = 0,
294 .bInterfaceClass = USB_CLASS_AUDIO,
295 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
296 .bInterfaceProtocol = UAC_VERSION_2,
297};
298
299/* Audio Streaming OUT Interface - Alt1 */
300static struct usb_interface_descriptor std_as_out_if1_desc = {
301 .bLength = sizeof std_as_out_if1_desc,
302 .bDescriptorType = USB_DT_INTERFACE,
303
304 .bAlternateSetting = 1,
305 .bNumEndpoints = 1,
306 .bInterfaceClass = USB_CLASS_AUDIO,
307 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
308 .bInterfaceProtocol = UAC_VERSION_2,
309};
310
311/* Audio Stream OUT Intface Desc */
312static struct uac2_as_header_descriptor as_out_hdr_desc = {
313 .bLength = sizeof as_out_hdr_desc,
314 .bDescriptorType = USB_DT_CS_INTERFACE,
315
316 .bDescriptorSubtype = UAC_AS_GENERAL,
317 /* .bTerminalLink = DYNAMIC */
318 .bmControls = 0,
319 .bFormatType = UAC_FORMAT_TYPE_I,
320 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
321 .iChannelNames = 0,
322};
323
324/* Audio USB_OUT Format */
325static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
326 .bLength = sizeof as_out_fmt1_desc,
327 .bDescriptorType = USB_DT_CS_INTERFACE,
328 .bDescriptorSubtype = UAC_FORMAT_TYPE,
329 .bFormatType = UAC_FORMAT_TYPE_I,
330};
331
332/* STD AS ISO OUT Endpoint */
333static struct usb_endpoint_descriptor fs_epout_desc = {
334 .bLength = USB_DT_ENDPOINT_SIZE,
335 .bDescriptorType = USB_DT_ENDPOINT,
336
337 .bEndpointAddress = USB_DIR_OUT,
338 /* .bmAttributes = DYNAMIC */
339 /* .wMaxPacketSize = DYNAMIC */
340 .bInterval = 1,
341};
342
343static struct usb_endpoint_descriptor hs_epout_desc = {
344 .bLength = USB_DT_ENDPOINT_SIZE,
345 .bDescriptorType = USB_DT_ENDPOINT,
346
347 /* .bmAttributes = DYNAMIC */
348 /* .wMaxPacketSize = DYNAMIC */
349 /* .bInterval = DYNAMIC */
350};
351
352static struct usb_endpoint_descriptor ss_epout_desc = {
353 .bLength = USB_DT_ENDPOINT_SIZE,
354 .bDescriptorType = USB_DT_ENDPOINT,
355
356 .bEndpointAddress = USB_DIR_OUT,
357 /* .bmAttributes = DYNAMIC */
358 /* .wMaxPacketSize = DYNAMIC */
359 /* .bInterval = DYNAMIC */
360};
361
362static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
363 .bLength = sizeof(ss_epout_desc_comp),
364 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
365 .bMaxBurst = 0,
366 .bmAttributes = 0,
367 /* wBytesPerInterval = DYNAMIC */
368};
369
370/* CS AS ISO OUT Endpoint */
371static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
372 .bLength = sizeof as_iso_out_desc,
373 .bDescriptorType = USB_DT_CS_ENDPOINT,
374
375 .bDescriptorSubtype = UAC_EP_GENERAL,
376 .bmAttributes = 0,
377 .bmControls = 0,
378 .bLockDelayUnits = 0,
379 .wLockDelay = 0,
380};
381
382/* STD AS ISO IN Feedback Endpoint */
383static struct usb_endpoint_descriptor fs_epin_fback_desc = {
384 .bLength = USB_DT_ENDPOINT_SIZE,
385 .bDescriptorType = USB_DT_ENDPOINT,
386
387 .bEndpointAddress = USB_DIR_IN,
388 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
389 .wMaxPacketSize = cpu_to_le16(3),
390 .bInterval = 1,
391};
392
393static struct usb_endpoint_descriptor hs_epin_fback_desc = {
394 .bLength = USB_DT_ENDPOINT_SIZE,
395 .bDescriptorType = USB_DT_ENDPOINT,
396
397 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
398 .wMaxPacketSize = cpu_to_le16(4),
399 .bInterval = 4,
400};
401
402static struct usb_endpoint_descriptor ss_epin_fback_desc = {
403 .bLength = USB_DT_ENDPOINT_SIZE,
404 .bDescriptorType = USB_DT_ENDPOINT,
405
406 .bEndpointAddress = USB_DIR_IN,
407 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
408 .wMaxPacketSize = cpu_to_le16(4),
409 .bInterval = 4,
410};
411
412static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
413 .bLength = sizeof(ss_epin_fback_desc_comp),
414 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
415 .bMaxBurst = 0,
416 .bmAttributes = 0,
417 .wBytesPerInterval = cpu_to_le16(4),
418};
419
420
421/* Audio Streaming IN Interface - Alt0 */
422static struct usb_interface_descriptor std_as_in_if0_desc = {
423 .bLength = sizeof std_as_in_if0_desc,
424 .bDescriptorType = USB_DT_INTERFACE,
425
426 .bAlternateSetting = 0,
427 .bNumEndpoints = 0,
428 .bInterfaceClass = USB_CLASS_AUDIO,
429 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
430 .bInterfaceProtocol = UAC_VERSION_2,
431};
432
433/* Audio Streaming IN Interface - Alt1 */
434static struct usb_interface_descriptor std_as_in_if1_desc = {
435 .bLength = sizeof std_as_in_if1_desc,
436 .bDescriptorType = USB_DT_INTERFACE,
437
438 .bAlternateSetting = 1,
439 .bNumEndpoints = 1,
440 .bInterfaceClass = USB_CLASS_AUDIO,
441 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
442 .bInterfaceProtocol = UAC_VERSION_2,
443};
444
445/* Audio Stream IN Intface Desc */
446static struct uac2_as_header_descriptor as_in_hdr_desc = {
447 .bLength = sizeof as_in_hdr_desc,
448 .bDescriptorType = USB_DT_CS_INTERFACE,
449
450 .bDescriptorSubtype = UAC_AS_GENERAL,
451 /* .bTerminalLink = DYNAMIC */
452 .bmControls = 0,
453 .bFormatType = UAC_FORMAT_TYPE_I,
454 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
455 .iChannelNames = 0,
456};
457
458/* Audio USB_IN Format */
459static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
460 .bLength = sizeof as_in_fmt1_desc,
461 .bDescriptorType = USB_DT_CS_INTERFACE,
462 .bDescriptorSubtype = UAC_FORMAT_TYPE,
463 .bFormatType = UAC_FORMAT_TYPE_I,
464};
465
466/* STD AS ISO IN Endpoint */
467static struct usb_endpoint_descriptor fs_epin_desc = {
468 .bLength = USB_DT_ENDPOINT_SIZE,
469 .bDescriptorType = USB_DT_ENDPOINT,
470
471 .bEndpointAddress = USB_DIR_IN,
472 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
473 /* .wMaxPacketSize = DYNAMIC */
474 .bInterval = 1,
475};
476
477static struct usb_endpoint_descriptor hs_epin_desc = {
478 .bLength = USB_DT_ENDPOINT_SIZE,
479 .bDescriptorType = USB_DT_ENDPOINT,
480
481 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
482 /* .wMaxPacketSize = DYNAMIC */
483 /* .bInterval = DYNAMIC */
484};
485
486static struct usb_endpoint_descriptor ss_epin_desc = {
487 .bLength = USB_DT_ENDPOINT_SIZE,
488 .bDescriptorType = USB_DT_ENDPOINT,
489
490 .bEndpointAddress = USB_DIR_IN,
491 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
492 /* .wMaxPacketSize = DYNAMIC */
493 /* .bInterval = DYNAMIC */
494};
495
496static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
497 .bLength = sizeof(ss_epin_desc_comp),
498 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
499 .bMaxBurst = 0,
500 .bmAttributes = 0,
501 /* wBytesPerInterval = DYNAMIC */
502};
503
504/* CS AS ISO IN Endpoint */
505static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
506 .bLength = sizeof as_iso_in_desc,
507 .bDescriptorType = USB_DT_CS_ENDPOINT,
508
509 .bDescriptorSubtype = UAC_EP_GENERAL,
510 .bmAttributes = 0,
511 .bmControls = 0,
512 .bLockDelayUnits = 0,
513 .wLockDelay = 0,
514};
515
516static struct usb_descriptor_header *fs_audio_desc[] = {
517 (struct usb_descriptor_header *)&iad_desc,
518 (struct usb_descriptor_header *)&std_ac_if_desc,
519
520 (struct usb_descriptor_header *)&ac_hdr_desc,
521 (struct usb_descriptor_header *)&in_clk_src_desc,
522 (struct usb_descriptor_header *)&out_clk_src_desc,
523 (struct usb_descriptor_header *)&usb_out_it_desc,
524 (struct usb_descriptor_header *)&out_feature_unit_desc,
525 (struct usb_descriptor_header *)&io_in_it_desc,
526 (struct usb_descriptor_header *)&usb_in_ot_desc,
527 (struct usb_descriptor_header *)&in_feature_unit_desc,
528 (struct usb_descriptor_header *)&io_out_ot_desc,
529
530 (struct usb_descriptor_header *)&fs_ep_int_desc,
531
532 (struct usb_descriptor_header *)&std_as_out_if0_desc,
533 (struct usb_descriptor_header *)&std_as_out_if1_desc,
534
535 (struct usb_descriptor_header *)&as_out_hdr_desc,
536 (struct usb_descriptor_header *)&as_out_fmt1_desc,
537 (struct usb_descriptor_header *)&fs_epout_desc,
538 (struct usb_descriptor_header *)&as_iso_out_desc,
539 (struct usb_descriptor_header *)&fs_epin_fback_desc,
540
541 (struct usb_descriptor_header *)&std_as_in_if0_desc,
542 (struct usb_descriptor_header *)&std_as_in_if1_desc,
543
544 (struct usb_descriptor_header *)&as_in_hdr_desc,
545 (struct usb_descriptor_header *)&as_in_fmt1_desc,
546 (struct usb_descriptor_header *)&fs_epin_desc,
547 (struct usb_descriptor_header *)&as_iso_in_desc,
548 NULL,
549};
550
551static struct usb_descriptor_header *hs_audio_desc[] = {
552 (struct usb_descriptor_header *)&iad_desc,
553 (struct usb_descriptor_header *)&std_ac_if_desc,
554
555 (struct usb_descriptor_header *)&ac_hdr_desc,
556 (struct usb_descriptor_header *)&in_clk_src_desc,
557 (struct usb_descriptor_header *)&out_clk_src_desc,
558 (struct usb_descriptor_header *)&usb_out_it_desc,
559 (struct usb_descriptor_header *)&out_feature_unit_desc,
560 (struct usb_descriptor_header *)&io_in_it_desc,
561 (struct usb_descriptor_header *)&usb_in_ot_desc,
562 (struct usb_descriptor_header *)&in_feature_unit_desc,
563 (struct usb_descriptor_header *)&io_out_ot_desc,
564
565 (struct usb_descriptor_header *)&hs_ep_int_desc,
566
567 (struct usb_descriptor_header *)&std_as_out_if0_desc,
568 (struct usb_descriptor_header *)&std_as_out_if1_desc,
569
570 (struct usb_descriptor_header *)&as_out_hdr_desc,
571 (struct usb_descriptor_header *)&as_out_fmt1_desc,
572 (struct usb_descriptor_header *)&hs_epout_desc,
573 (struct usb_descriptor_header *)&as_iso_out_desc,
574 (struct usb_descriptor_header *)&hs_epin_fback_desc,
575
576 (struct usb_descriptor_header *)&std_as_in_if0_desc,
577 (struct usb_descriptor_header *)&std_as_in_if1_desc,
578
579 (struct usb_descriptor_header *)&as_in_hdr_desc,
580 (struct usb_descriptor_header *)&as_in_fmt1_desc,
581 (struct usb_descriptor_header *)&hs_epin_desc,
582 (struct usb_descriptor_header *)&as_iso_in_desc,
583 NULL,
584};
585
586static struct usb_descriptor_header *ss_audio_desc[] = {
587 (struct usb_descriptor_header *)&iad_desc,
588 (struct usb_descriptor_header *)&std_ac_if_desc,
589
590 (struct usb_descriptor_header *)&ac_hdr_desc,
591 (struct usb_descriptor_header *)&in_clk_src_desc,
592 (struct usb_descriptor_header *)&out_clk_src_desc,
593 (struct usb_descriptor_header *)&usb_out_it_desc,
594 (struct usb_descriptor_header *)&out_feature_unit_desc,
595 (struct usb_descriptor_header *)&io_in_it_desc,
596 (struct usb_descriptor_header *)&usb_in_ot_desc,
597 (struct usb_descriptor_header *)&in_feature_unit_desc,
598 (struct usb_descriptor_header *)&io_out_ot_desc,
599
600 (struct usb_descriptor_header *)&ss_ep_int_desc,
601 (struct usb_descriptor_header *)&ss_ep_int_desc_comp,
602
603 (struct usb_descriptor_header *)&std_as_out_if0_desc,
604 (struct usb_descriptor_header *)&std_as_out_if1_desc,
605
606 (struct usb_descriptor_header *)&as_out_hdr_desc,
607 (struct usb_descriptor_header *)&as_out_fmt1_desc,
608 (struct usb_descriptor_header *)&ss_epout_desc,
609 (struct usb_descriptor_header *)&ss_epout_desc_comp,
610 (struct usb_descriptor_header *)&as_iso_out_desc,
611 (struct usb_descriptor_header *)&ss_epin_fback_desc,
612 (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
613
614 (struct usb_descriptor_header *)&std_as_in_if0_desc,
615 (struct usb_descriptor_header *)&std_as_in_if1_desc,
616
617 (struct usb_descriptor_header *)&as_in_hdr_desc,
618 (struct usb_descriptor_header *)&as_in_fmt1_desc,
619 (struct usb_descriptor_header *)&ss_epin_desc,
620 (struct usb_descriptor_header *)&ss_epin_desc_comp,
621 (struct usb_descriptor_header *)&as_iso_in_desc,
622 NULL,
623};
624
625struct cntrl_cur_lay2 {
626 __le16 wCUR;
627};
628
629struct cntrl_range_lay2 {
630 __le16 wNumSubRanges;
631 __le16 wMIN;
632 __le16 wMAX;
633 __le16 wRES;
634} __packed;
635
636struct cntrl_cur_lay3 {
637 __le32 dCUR;
638};
639
640struct cntrl_subrange_lay3 {
641 __le32 dMIN;
642 __le32 dMAX;
643 __le32 dRES;
644} __packed;
645
646#define ranges_lay3_size(c) (sizeof(c.wNumSubRanges) \
647 + le16_to_cpu(c.wNumSubRanges) \
648 * sizeof(struct cntrl_subrange_lay3))
649
650#define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n) \
651 struct cntrl_ranges_lay3_##k { \
652 __le16 wNumSubRanges; \
653 struct cntrl_subrange_lay3 r[n]; \
654} __packed
655
656DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES);
657
658static int get_max_srate(const int *srates)
659{
660 int i, max_srate = 0;
661
662 for (i = 0; i < UAC_MAX_RATES; i++) {
663 if (srates[i] == 0)
664 break;
665 if (srates[i] > max_srate)
666 max_srate = srates[i];
667 }
668 return max_srate;
669}
670
671static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts,
672 u8 bint, unsigned int factor, bool is_playback)
673{
674 int chmask, srate, ssize;
675 u16 max_size_bw;
676
677 if (is_playback) {
678 chmask = uac2_opts->p_chmask;
679 srate = get_max_srate(srates: uac2_opts->p_srates);
680 ssize = uac2_opts->p_ssize;
681 } else {
682 chmask = uac2_opts->c_chmask;
683 srate = get_max_srate(srates: uac2_opts->c_srates);
684 ssize = uac2_opts->c_ssize;
685 }
686
687 if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
688 // playback is always async, capture only when configured
689 // Win10 requires max packet size + 1 frame
690 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
691 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
692 max_size_bw = num_channels(chanmask: chmask) * ssize *
693 (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))));
694 } else {
695 // adding 1 frame provision for Win10
696 max_size_bw = num_channels(chanmask: chmask) * ssize *
697 (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1);
698 }
699 return max_size_bw;
700}
701
702static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts,
703 struct usb_endpoint_descriptor *ep_desc,
704 enum usb_device_speed speed, bool is_playback)
705{
706 u16 max_size_bw, max_size_ep;
707 u8 bint, opts_bint;
708 char *dir;
709
710 switch (speed) {
711 case USB_SPEED_FULL:
712 max_size_ep = 1023;
713 // fixed
714 bint = ep_desc->bInterval;
715 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, factor: 1000, is_playback);
716 break;
717
718 case USB_SPEED_HIGH:
719 case USB_SPEED_SUPER:
720 max_size_ep = 1024;
721 if (is_playback)
722 opts_bint = uac2_opts->p_hs_bint;
723 else
724 opts_bint = uac2_opts->c_hs_bint;
725
726 if (opts_bint > 0) {
727 /* fixed bint */
728 bint = opts_bint;
729 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, factor: 8000, is_playback);
730 } else {
731 /* checking bInterval from 4 to 1 whether the required bandwidth fits */
732 for (bint = 4; bint > 0; --bint) {
733 max_size_bw = get_max_bw_for_bint(
734 uac2_opts, bint, factor: 8000, is_playback);
735 if (max_size_bw <= max_size_ep)
736 break;
737 }
738 }
739 break;
740
741 default:
742 return -EINVAL;
743 }
744
745 if (is_playback)
746 dir = "Playback";
747 else
748 dir = "Capture";
749
750 if (max_size_bw <= max_size_ep)
751 dev_dbg(dev,
752 "%s %s: Would use wMaxPacketSize %d and bInterval %d\n",
753 speed_names[speed], dir, max_size_bw, bint);
754 else {
755 dev_warn(dev,
756 "%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n",
757 speed_names[speed], dir, max_size_bw, bint, max_size_ep);
758 max_size_bw = max_size_ep;
759 }
760
761 ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw);
762 ep_desc->bInterval = bint;
763
764 return 0;
765}
766
767static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
768{
769 struct uac2_feature_unit_descriptor *fu_desc;
770 int channels = num_channels(chanmask: chmask);
771 int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
772
773 fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
774 if (!fu_desc)
775 return NULL;
776
777 fu_desc->bLength = fu_desc_size;
778 fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
779
780 fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
781
782 /* bUnitID, bSourceID and bmaControls will be defined later */
783
784 return fu_desc;
785}
786
787/* Use macro to overcome line length limitation */
788#define USBDHDR(p) (struct usb_descriptor_header *)(p)
789
790static void setup_headers(struct f_uac2_opts *opts,
791 struct usb_descriptor_header **headers,
792 enum usb_device_speed speed)
793{
794 struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
795 struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
796 struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
797 struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
798 struct usb_endpoint_descriptor *epout_desc;
799 struct usb_endpoint_descriptor *epin_desc;
800 struct usb_endpoint_descriptor *epin_fback_desc;
801 struct usb_endpoint_descriptor *ep_int_desc;
802 int i;
803
804 switch (speed) {
805 case USB_SPEED_FULL:
806 epout_desc = &fs_epout_desc;
807 epin_desc = &fs_epin_desc;
808 epin_fback_desc = &fs_epin_fback_desc;
809 ep_int_desc = &fs_ep_int_desc;
810 break;
811 case USB_SPEED_HIGH:
812 epout_desc = &hs_epout_desc;
813 epin_desc = &hs_epin_desc;
814 epin_fback_desc = &hs_epin_fback_desc;
815 ep_int_desc = &hs_ep_int_desc;
816 break;
817 default:
818 epout_desc = &ss_epout_desc;
819 epin_desc = &ss_epin_desc;
820 epout_desc_comp = &ss_epout_desc_comp;
821 epin_desc_comp = &ss_epin_desc_comp;
822 epin_fback_desc = &ss_epin_fback_desc;
823 epin_fback_desc_comp = &ss_epin_fback_desc_comp;
824 ep_int_desc = &ss_ep_int_desc;
825 ep_int_desc_comp = &ss_ep_int_desc_comp;
826 }
827
828 i = 0;
829 headers[i++] = USBDHDR(&iad_desc);
830 headers[i++] = USBDHDR(&std_ac_if_desc);
831 headers[i++] = USBDHDR(&ac_hdr_desc);
832 if (EPIN_EN(opts))
833 headers[i++] = USBDHDR(&in_clk_src_desc);
834 if (EPOUT_EN(opts)) {
835 headers[i++] = USBDHDR(&out_clk_src_desc);
836 headers[i++] = USBDHDR(&usb_out_it_desc);
837
838 if (FUOUT_EN(opts))
839 headers[i++] = USBDHDR(out_feature_unit_desc);
840 }
841
842 if (EPIN_EN(opts)) {
843 headers[i++] = USBDHDR(&io_in_it_desc);
844
845 if (FUIN_EN(opts))
846 headers[i++] = USBDHDR(in_feature_unit_desc);
847
848 headers[i++] = USBDHDR(&usb_in_ot_desc);
849 }
850
851 if (EPOUT_EN(opts))
852 headers[i++] = USBDHDR(&io_out_ot_desc);
853
854 if (FUOUT_EN(opts) || FUIN_EN(opts)) {
855 headers[i++] = USBDHDR(ep_int_desc);
856 if (ep_int_desc_comp)
857 headers[i++] = USBDHDR(ep_int_desc_comp);
858 }
859
860 if (EPOUT_EN(opts)) {
861 headers[i++] = USBDHDR(&std_as_out_if0_desc);
862 headers[i++] = USBDHDR(&std_as_out_if1_desc);
863 headers[i++] = USBDHDR(&as_out_hdr_desc);
864 headers[i++] = USBDHDR(&as_out_fmt1_desc);
865 headers[i++] = USBDHDR(epout_desc);
866 if (epout_desc_comp)
867 headers[i++] = USBDHDR(epout_desc_comp);
868
869 headers[i++] = USBDHDR(&as_iso_out_desc);
870
871 if (EPOUT_FBACK_IN_EN(opts)) {
872 headers[i++] = USBDHDR(epin_fback_desc);
873 if (epin_fback_desc_comp)
874 headers[i++] = USBDHDR(epin_fback_desc_comp);
875 }
876 }
877
878 if (EPIN_EN(opts)) {
879 headers[i++] = USBDHDR(&std_as_in_if0_desc);
880 headers[i++] = USBDHDR(&std_as_in_if1_desc);
881 headers[i++] = USBDHDR(&as_in_hdr_desc);
882 headers[i++] = USBDHDR(&as_in_fmt1_desc);
883 headers[i++] = USBDHDR(epin_desc);
884 if (epin_desc_comp)
885 headers[i++] = USBDHDR(epin_desc_comp);
886
887 headers[i++] = USBDHDR(&as_iso_in_desc);
888 }
889 headers[i] = NULL;
890}
891
892static void setup_descriptor(struct f_uac2_opts *opts)
893{
894 /* patch descriptors */
895 int i = 1; /* ID's start with 1 */
896
897 if (EPOUT_EN(opts))
898 usb_out_it_desc.bTerminalID = i++;
899 if (EPIN_EN(opts))
900 io_in_it_desc.bTerminalID = i++;
901 if (EPOUT_EN(opts))
902 io_out_ot_desc.bTerminalID = i++;
903 if (EPIN_EN(opts))
904 usb_in_ot_desc.bTerminalID = i++;
905 if (FUOUT_EN(opts))
906 out_feature_unit_desc->bUnitID = i++;
907 if (FUIN_EN(opts))
908 in_feature_unit_desc->bUnitID = i++;
909 if (EPOUT_EN(opts))
910 out_clk_src_desc.bClockID = i++;
911 if (EPIN_EN(opts))
912 in_clk_src_desc.bClockID = i++;
913
914 usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
915
916 if (FUIN_EN(opts)) {
917 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
918 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
919 } else {
920 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
921 }
922
923 usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
924 io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
925 io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
926
927 if (FUOUT_EN(opts)) {
928 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
929 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
930 } else {
931 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
932 }
933
934 as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
935 as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
936
937 iad_desc.bInterfaceCount = 1;
938 ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
939
940 if (EPIN_EN(opts)) {
941 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
942
943 len += sizeof(in_clk_src_desc);
944 len += sizeof(usb_in_ot_desc);
945
946 if (FUIN_EN(opts))
947 len += in_feature_unit_desc->bLength;
948
949 len += sizeof(io_in_it_desc);
950 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
951 iad_desc.bInterfaceCount++;
952 }
953 if (EPOUT_EN(opts)) {
954 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
955
956 len += sizeof(out_clk_src_desc);
957 len += sizeof(usb_out_it_desc);
958
959 if (FUOUT_EN(opts))
960 len += out_feature_unit_desc->bLength;
961
962 len += sizeof(io_out_ot_desc);
963 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
964 iad_desc.bInterfaceCount++;
965 }
966
967 io_in_it_desc.wTerminalType = cpu_to_le16(opts->c_terminal_type);
968 io_out_ot_desc.wTerminalType = cpu_to_le16(opts->p_terminal_type);
969
970 setup_headers(opts, headers: fs_audio_desc, speed: USB_SPEED_FULL);
971 setup_headers(opts, headers: hs_audio_desc, speed: USB_SPEED_HIGH);
972 setup_headers(opts, headers: ss_audio_desc, speed: USB_SPEED_SUPER);
973}
974
975static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
976{
977 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
978 const char *msg = NULL;
979
980 if (!opts->p_chmask && !opts->c_chmask)
981 msg = "no playback and capture channels";
982 else if (opts->p_chmask & ~UAC2_CHANNEL_MASK)
983 msg = "unsupported playback channels mask";
984 else if (opts->c_chmask & ~UAC2_CHANNEL_MASK)
985 msg = "unsupported capture channels mask";
986 else if ((opts->p_ssize < 1) || (opts->p_ssize > 4))
987 msg = "incorrect playback sample size";
988 else if ((opts->c_ssize < 1) || (opts->c_ssize > 4))
989 msg = "incorrect capture sample size";
990 else if (!opts->p_srates[0])
991 msg = "incorrect playback sampling rate";
992 else if (!opts->c_srates[0])
993 msg = "incorrect capture sampling rate";
994
995 else if (opts->p_volume_max <= opts->p_volume_min)
996 msg = "incorrect playback volume max/min";
997 else if (opts->c_volume_max <= opts->c_volume_min)
998 msg = "incorrect capture volume max/min";
999 else if (opts->p_volume_res <= 0)
1000 msg = "negative/zero playback volume resolution";
1001 else if (opts->c_volume_res <= 0)
1002 msg = "negative/zero capture volume resolution";
1003
1004 else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res)
1005 msg = "incorrect playback volume resolution";
1006 else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res)
1007 msg = "incorrect capture volume resolution";
1008
1009 else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4))
1010 msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)";
1011 else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4))
1012 msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)";
1013
1014 if (msg) {
1015 dev_err(dev, "Error: %s\n", msg);
1016 return -EINVAL;
1017 }
1018
1019 return 0;
1020}
1021
1022static int
1023afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
1024{
1025 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1026 struct g_audio *agdev = func_to_g_audio(f: fn);
1027 struct usb_composite_dev *cdev = cfg->cdev;
1028 struct usb_gadget *gadget = cdev->gadget;
1029 struct device *dev = &gadget->dev;
1030 struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
1031 struct usb_string *us;
1032 int ret;
1033
1034 ret = afunc_validate_opts(agdev, dev);
1035 if (ret)
1036 return ret;
1037
1038 strings_fn[STR_ASSOC].s = uac2_opts->function_name;
1039 strings_fn[STR_IF_CTRL].s = uac2_opts->if_ctrl_name;
1040 strings_fn[STR_CLKSRC_IN].s = uac2_opts->clksrc_in_name;
1041 strings_fn[STR_CLKSRC_OUT].s = uac2_opts->clksrc_out_name;
1042
1043 strings_fn[STR_USB_IT].s = uac2_opts->c_it_name;
1044 strings_fn[STR_USB_IT_CH].s = uac2_opts->c_it_ch_name;
1045 strings_fn[STR_IO_OT].s = uac2_opts->c_ot_name;
1046 strings_fn[STR_FU_OUT].s = uac2_opts->c_fu_vol_name;
1047 strings_fn[STR_AS_OUT_ALT0].s = "Playback Inactive";
1048 strings_fn[STR_AS_OUT_ALT1].s = "Playback Active";
1049
1050 strings_fn[STR_IO_IT].s = uac2_opts->p_it_name;
1051 strings_fn[STR_IO_IT_CH].s = uac2_opts->p_it_ch_name;
1052 strings_fn[STR_USB_OT].s = uac2_opts->p_ot_name;
1053 strings_fn[STR_FU_IN].s = uac2_opts->p_fu_vol_name;
1054 strings_fn[STR_AS_IN_ALT0].s = "Capture Inactive";
1055 strings_fn[STR_AS_IN_ALT1].s = "Capture Active";
1056
1057 us = usb_gstrings_attach(cdev, sp: fn_strings, ARRAY_SIZE(strings_fn));
1058 if (IS_ERR(ptr: us))
1059 return PTR_ERR(ptr: us);
1060
1061 if (FUOUT_EN(uac2_opts)) {
1062 out_feature_unit_desc = build_fu_desc(chmask: uac2_opts->c_chmask);
1063 if (!out_feature_unit_desc)
1064 return -ENOMEM;
1065 }
1066 if (FUIN_EN(uac2_opts)) {
1067 in_feature_unit_desc = build_fu_desc(chmask: uac2_opts->p_chmask);
1068 if (!in_feature_unit_desc) {
1069 ret = -ENOMEM;
1070 goto err_free_fu;
1071 }
1072 }
1073
1074 iad_desc.iFunction = us[STR_ASSOC].id;
1075 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
1076 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
1077 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
1078 usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
1079 usb_out_it_desc.iChannelNames = us[STR_USB_IT_CH].id;
1080 io_in_it_desc.iTerminal = us[STR_IO_IT].id;
1081 io_in_it_desc.iChannelNames = us[STR_IO_IT_CH].id;
1082 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
1083 io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
1084 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
1085 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
1086 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
1087 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
1088
1089 if (FUOUT_EN(uac2_opts)) {
1090 u8 *i_feature = (u8 *)out_feature_unit_desc +
1091 out_feature_unit_desc->bLength - 1;
1092 *i_feature = us[STR_FU_OUT].id;
1093 }
1094 if (FUIN_EN(uac2_opts)) {
1095 u8 *i_feature = (u8 *)in_feature_unit_desc +
1096 in_feature_unit_desc->bLength - 1;
1097 *i_feature = us[STR_FU_IN].id;
1098 }
1099
1100
1101 /* Initialize the configurable parameters */
1102 usb_out_it_desc.bNrChannels = num_channels(chanmask: uac2_opts->c_chmask);
1103 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1104 io_in_it_desc.bNrChannels = num_channels(chanmask: uac2_opts->p_chmask);
1105 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1106 as_out_hdr_desc.bNrChannels = num_channels(chanmask: uac2_opts->c_chmask);
1107 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1108 as_in_hdr_desc.bNrChannels = num_channels(chanmask: uac2_opts->p_chmask);
1109 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1110 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1111 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1112 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1113 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1114 if (FUOUT_EN(uac2_opts)) {
1115 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
1116 u32 control = 0;
1117
1118 if (uac2_opts->c_mute_present)
1119 control |= CONTROL_RDWR << FU_MUTE_CTRL;
1120 if (uac2_opts->c_volume_present)
1121 control |= CONTROL_RDWR << FU_VOL_CTRL;
1122 *bma = cpu_to_le32(control);
1123 }
1124 if (FUIN_EN(uac2_opts)) {
1125 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1126 u32 control = 0;
1127
1128 if (uac2_opts->p_mute_present)
1129 control |= CONTROL_RDWR << FU_MUTE_CTRL;
1130 if (uac2_opts->p_volume_present)
1131 control |= CONTROL_RDWR << FU_VOL_CTRL;
1132 *bma = cpu_to_le32(control);
1133 }
1134
1135 ret = usb_interface_id(cfg, fn);
1136 if (ret < 0) {
1137 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1138 goto err_free_fu;
1139 }
1140 iad_desc.bFirstInterface = ret;
1141
1142 std_ac_if_desc.bInterfaceNumber = ret;
1143 uac2->ac_intf = ret;
1144 uac2->ac_alt = 0;
1145
1146 if (EPOUT_EN(uac2_opts)) {
1147 ret = usb_interface_id(cfg, fn);
1148 if (ret < 0) {
1149 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1150 goto err_free_fu;
1151 }
1152 std_as_out_if0_desc.bInterfaceNumber = ret;
1153 std_as_out_if1_desc.bInterfaceNumber = ret;
1154 std_as_out_if1_desc.bNumEndpoints = 1;
1155 uac2->as_out_intf = ret;
1156 uac2->as_out_alt = 0;
1157
1158 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1159 fs_epout_desc.bmAttributes =
1160 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1161 hs_epout_desc.bmAttributes =
1162 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1163 ss_epout_desc.bmAttributes =
1164 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1165 std_as_out_if1_desc.bNumEndpoints++;
1166 } else {
1167 fs_epout_desc.bmAttributes =
1168 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1169 hs_epout_desc.bmAttributes =
1170 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1171 ss_epout_desc.bmAttributes =
1172 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1173 }
1174 }
1175
1176 if (EPIN_EN(uac2_opts)) {
1177 ret = usb_interface_id(cfg, fn);
1178 if (ret < 0) {
1179 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1180 goto err_free_fu;
1181 }
1182 std_as_in_if0_desc.bInterfaceNumber = ret;
1183 std_as_in_if1_desc.bInterfaceNumber = ret;
1184 uac2->as_in_intf = ret;
1185 uac2->as_in_alt = 0;
1186 }
1187
1188 std_ac_if_desc.bNumEndpoints = 0;
1189 if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1190 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1191 if (!uac2->int_ep) {
1192 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1193 ret = -ENODEV;
1194 goto err_free_fu;
1195 }
1196
1197 std_ac_if_desc.bNumEndpoints = 1;
1198 }
1199
1200 hs_epin_desc.bInterval = uac2_opts->p_hs_bint;
1201 ss_epin_desc.bInterval = uac2_opts->p_hs_bint;
1202 hs_epout_desc.bInterval = uac2_opts->c_hs_bint;
1203 ss_epout_desc.bInterval = uac2_opts->c_hs_bint;
1204
1205 /* Calculate wMaxPacketSize according to audio bandwidth */
1206 ret = set_ep_max_packet_size_bint(dev, uac2_opts, ep_desc: &fs_epin_desc,
1207 speed: USB_SPEED_FULL, is_playback: true);
1208 if (ret < 0) {
1209 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1210 return ret;
1211 }
1212
1213 ret = set_ep_max_packet_size_bint(dev, uac2_opts, ep_desc: &fs_epout_desc,
1214 speed: USB_SPEED_FULL, is_playback: false);
1215 if (ret < 0) {
1216 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1217 return ret;
1218 }
1219
1220 ret = set_ep_max_packet_size_bint(dev, uac2_opts, ep_desc: &hs_epin_desc,
1221 speed: USB_SPEED_HIGH, is_playback: true);
1222 if (ret < 0) {
1223 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1224 return ret;
1225 }
1226
1227 ret = set_ep_max_packet_size_bint(dev, uac2_opts, ep_desc: &hs_epout_desc,
1228 speed: USB_SPEED_HIGH, is_playback: false);
1229 if (ret < 0) {
1230 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1231 return ret;
1232 }
1233
1234 ret = set_ep_max_packet_size_bint(dev, uac2_opts, ep_desc: &ss_epin_desc,
1235 speed: USB_SPEED_SUPER, is_playback: true);
1236 if (ret < 0) {
1237 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1238 return ret;
1239 }
1240
1241 ret = set_ep_max_packet_size_bint(dev, uac2_opts, ep_desc: &ss_epout_desc,
1242 speed: USB_SPEED_SUPER, is_playback: false);
1243 if (ret < 0) {
1244 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1245 return ret;
1246 }
1247
1248 if (EPOUT_EN(uac2_opts)) {
1249 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1250 if (!agdev->out_ep) {
1251 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1252 ret = -ENODEV;
1253 goto err_free_fu;
1254 }
1255 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1256 agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1257 &fs_epin_fback_desc);
1258 if (!agdev->in_ep_fback) {
1259 dev_err(dev, "%s:%d Error!\n",
1260 __func__, __LINE__);
1261 ret = -ENODEV;
1262 goto err_free_fu;
1263 }
1264 }
1265 }
1266
1267 if (EPIN_EN(uac2_opts)) {
1268 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1269 if (!agdev->in_ep) {
1270 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1271 ret = -ENODEV;
1272 goto err_free_fu;
1273 }
1274 }
1275
1276 agdev->in_ep_maxpsize = max_t(u16,
1277 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1278 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1279 agdev->out_ep_maxpsize = max_t(u16,
1280 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1281 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1282
1283 agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1284 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1285 agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1286 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1287
1288 ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
1289 ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
1290
1291 // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1292 hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1293 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1294 hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1295 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1296 ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1297 ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1298 ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1299 ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1300
1301 setup_descriptor(uac2_opts);
1302
1303 ret = usb_assign_descriptors(f: fn, fs: fs_audio_desc, hs: hs_audio_desc, ss: ss_audio_desc,
1304 ssp: ss_audio_desc);
1305 if (ret)
1306 goto err_free_fu;
1307
1308 agdev->gadget = gadget;
1309
1310 agdev->params.p_chmask = uac2_opts->p_chmask;
1311 memcpy(agdev->params.p_srates, uac2_opts->p_srates,
1312 sizeof(agdev->params.p_srates));
1313 agdev->params.p_ssize = uac2_opts->p_ssize;
1314 if (FUIN_EN(uac2_opts)) {
1315 agdev->params.p_fu.id = USB_IN_FU_ID;
1316 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1317 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1318 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1319 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1320 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1321 }
1322 agdev->params.c_chmask = uac2_opts->c_chmask;
1323 memcpy(agdev->params.c_srates, uac2_opts->c_srates,
1324 sizeof(agdev->params.c_srates));
1325 agdev->params.c_ssize = uac2_opts->c_ssize;
1326 if (FUOUT_EN(uac2_opts)) {
1327 agdev->params.c_fu.id = USB_OUT_FU_ID;
1328 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1329 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1330 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1331 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1332 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1333 }
1334 agdev->params.req_number = uac2_opts->req_number;
1335 agdev->params.fb_max = uac2_opts->fb_max;
1336
1337 if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1338 agdev->notify = afunc_notify;
1339
1340 ret = g_audio_setup(g_audio: agdev, pcm_name: "UAC2 PCM", card_name: "UAC2_Gadget");
1341 if (ret)
1342 goto err_free_descs;
1343
1344 return 0;
1345
1346err_free_descs:
1347 usb_free_all_descriptors(f: fn);
1348 agdev->gadget = NULL;
1349err_free_fu:
1350 kfree(objp: out_feature_unit_desc);
1351 out_feature_unit_desc = NULL;
1352 kfree(objp: in_feature_unit_desc);
1353 in_feature_unit_desc = NULL;
1354 return ret;
1355}
1356
1357static void
1358afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1359{
1360 struct g_audio *agdev = req->context;
1361 struct f_uac2 *uac2 = func_to_uac2(f: &agdev->func);
1362
1363 atomic_dec(v: &uac2->int_count);
1364 kfree(objp: req->buf);
1365 usb_ep_free_request(ep: _ep, req);
1366}
1367
1368static int
1369afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1370{
1371 struct f_uac2 *uac2 = func_to_uac2(f: &agdev->func);
1372 struct usb_request *req;
1373 struct uac2_interrupt_data_msg *msg;
1374 u16 w_index, w_value;
1375 int ret;
1376
1377 if (!uac2->int_ep->enabled)
1378 return 0;
1379
1380 if (atomic_inc_return(v: &uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1381 atomic_dec(v: &uac2->int_count);
1382 return 0;
1383 }
1384
1385 req = usb_ep_alloc_request(ep: uac2->int_ep, GFP_ATOMIC);
1386 if (req == NULL) {
1387 ret = -ENOMEM;
1388 goto err_dec_int_count;
1389 }
1390
1391 msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1392 if (msg == NULL) {
1393 ret = -ENOMEM;
1394 goto err_free_request;
1395 }
1396
1397 w_index = unit_id << 8 | uac2->ac_intf;
1398 w_value = cs << 8;
1399
1400 msg->bInfo = 0; /* Non-vendor, interface interrupt */
1401 msg->bAttribute = UAC2_CS_CUR;
1402 msg->wIndex = cpu_to_le16(w_index);
1403 msg->wValue = cpu_to_le16(w_value);
1404
1405 req->length = sizeof(*msg);
1406 req->buf = msg;
1407 req->context = agdev;
1408 req->complete = afunc_notify_complete;
1409
1410 ret = usb_ep_queue(ep: uac2->int_ep, req, GFP_ATOMIC);
1411
1412 if (ret)
1413 goto err_free_msg;
1414
1415 return 0;
1416
1417err_free_msg:
1418 kfree(objp: msg);
1419err_free_request:
1420 usb_ep_free_request(ep: uac2->int_ep, req);
1421err_dec_int_count:
1422 atomic_dec(v: &uac2->int_count);
1423
1424 return ret;
1425}
1426
1427static int
1428afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1429{
1430 struct usb_composite_dev *cdev = fn->config->cdev;
1431 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1432 struct g_audio *agdev = func_to_g_audio(f: fn);
1433 struct usb_gadget *gadget = cdev->gadget;
1434 struct device *dev = &gadget->dev;
1435 int ret = 0;
1436
1437 /* No i/f has more than 2 alt settings */
1438 if (alt > 1) {
1439 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1440 return -EINVAL;
1441 }
1442
1443 if (intf == uac2->ac_intf) {
1444 /* Control I/f has only 1 AltSetting - 0 */
1445 if (alt) {
1446 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1447 return -EINVAL;
1448 }
1449
1450 /* restart interrupt endpoint */
1451 if (uac2->int_ep) {
1452 usb_ep_disable(ep: uac2->int_ep);
1453 config_ep_by_speed(g: gadget, f: &agdev->func, ep: uac2->int_ep);
1454 usb_ep_enable(ep: uac2->int_ep);
1455 }
1456
1457 return 0;
1458 }
1459
1460 if (intf == uac2->as_out_intf) {
1461 uac2->as_out_alt = alt;
1462
1463 if (alt)
1464 ret = u_audio_start_capture(g_audio: &uac2->g_audio);
1465 else
1466 u_audio_stop_capture(g_audio: &uac2->g_audio);
1467 } else if (intf == uac2->as_in_intf) {
1468 uac2->as_in_alt = alt;
1469
1470 if (alt)
1471 ret = u_audio_start_playback(g_audio: &uac2->g_audio);
1472 else
1473 u_audio_stop_playback(g_audio: &uac2->g_audio);
1474 } else {
1475 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1476 return -EINVAL;
1477 }
1478
1479 return ret;
1480}
1481
1482static int
1483afunc_get_alt(struct usb_function *fn, unsigned intf)
1484{
1485 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1486 struct g_audio *agdev = func_to_g_audio(f: fn);
1487
1488 if (intf == uac2->ac_intf)
1489 return uac2->ac_alt;
1490 else if (intf == uac2->as_out_intf)
1491 return uac2->as_out_alt;
1492 else if (intf == uac2->as_in_intf)
1493 return uac2->as_in_alt;
1494 else
1495 dev_err(&agdev->gadget->dev,
1496 "%s:%d Invalid Interface %d!\n",
1497 __func__, __LINE__, intf);
1498
1499 return -EINVAL;
1500}
1501
1502static void
1503afunc_disable(struct usb_function *fn)
1504{
1505 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1506
1507 uac2->as_in_alt = 0;
1508 uac2->as_out_alt = 0;
1509 u_audio_stop_capture(g_audio: &uac2->g_audio);
1510 u_audio_stop_playback(g_audio: &uac2->g_audio);
1511 if (uac2->int_ep)
1512 usb_ep_disable(ep: uac2->int_ep);
1513}
1514
1515static void
1516afunc_suspend(struct usb_function *fn)
1517{
1518 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1519
1520 u_audio_suspend(g_audio: &uac2->g_audio);
1521}
1522
1523static int
1524in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1525{
1526 struct usb_request *req = fn->config->cdev->req;
1527 struct g_audio *agdev = func_to_g_audio(f: fn);
1528 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1529 u16 w_length = le16_to_cpu(cr->wLength);
1530 u16 w_index = le16_to_cpu(cr->wIndex);
1531 u16 w_value = le16_to_cpu(cr->wValue);
1532 u8 entity_id = (w_index >> 8) & 0xff;
1533 u8 control_selector = w_value >> 8;
1534 int value = -EOPNOTSUPP;
1535 u32 p_srate, c_srate;
1536
1537 u_audio_get_playback_srate(audio_dev: agdev, val: &p_srate);
1538 u_audio_get_capture_srate(audio_dev: agdev, val: &c_srate);
1539
1540 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1541 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1542 struct cntrl_cur_lay3 c;
1543
1544 memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1545
1546 if (entity_id == USB_IN_CLK_ID)
1547 c.dCUR = cpu_to_le32(p_srate);
1548 else if (entity_id == USB_OUT_CLK_ID)
1549 c.dCUR = cpu_to_le32(c_srate);
1550
1551 value = min_t(unsigned int, w_length, sizeof(c));
1552 memcpy(req->buf, &c, value);
1553 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1554 *(u8 *)req->buf = 1;
1555 value = min_t(unsigned int, w_length, 1);
1556 } else {
1557 dev_err(&agdev->gadget->dev,
1558 "%s:%d control_selector=%d TODO!\n",
1559 __func__, __LINE__, control_selector);
1560 }
1561 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1562 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1563 unsigned int is_playback = 0;
1564
1565 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1566 is_playback = 1;
1567
1568 if (control_selector == UAC_FU_MUTE) {
1569 unsigned int mute;
1570
1571 u_audio_get_mute(g_audio: agdev, playback: is_playback, val: &mute);
1572
1573 *(u8 *)req->buf = mute;
1574 value = min_t(unsigned int, w_length, 1);
1575 } else if (control_selector == UAC_FU_VOLUME) {
1576 struct cntrl_cur_lay2 c;
1577 s16 volume;
1578
1579 memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1580
1581 u_audio_get_volume(g_audio: agdev, playback: is_playback, val: &volume);
1582 c.wCUR = cpu_to_le16(volume);
1583
1584 value = min_t(unsigned int, w_length, sizeof(c));
1585 memcpy(req->buf, &c, value);
1586 } else {
1587 dev_err(&agdev->gadget->dev,
1588 "%s:%d control_selector=%d TODO!\n",
1589 __func__, __LINE__, control_selector);
1590 }
1591 } else {
1592 dev_err(&agdev->gadget->dev,
1593 "%s:%d entity_id=%d control_selector=%d TODO!\n",
1594 __func__, __LINE__, entity_id, control_selector);
1595 }
1596
1597 return value;
1598}
1599
1600static int
1601in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1602{
1603 struct usb_request *req = fn->config->cdev->req;
1604 struct g_audio *agdev = func_to_g_audio(f: fn);
1605 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1606 u16 w_length = le16_to_cpu(cr->wLength);
1607 u16 w_index = le16_to_cpu(cr->wIndex);
1608 u16 w_value = le16_to_cpu(cr->wValue);
1609 u8 entity_id = (w_index >> 8) & 0xff;
1610 u8 control_selector = w_value >> 8;
1611 int value = -EOPNOTSUPP;
1612
1613 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1614 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1615 struct cntrl_ranges_lay3_srates rs;
1616 int i;
1617 int wNumSubRanges = 0;
1618 int srate;
1619 int *srates;
1620
1621 if (entity_id == USB_IN_CLK_ID)
1622 srates = opts->p_srates;
1623 else if (entity_id == USB_OUT_CLK_ID)
1624 srates = opts->c_srates;
1625 else
1626 return -EOPNOTSUPP;
1627 for (i = 0; i < UAC_MAX_RATES; i++) {
1628 srate = srates[i];
1629 if (srate == 0)
1630 break;
1631
1632 rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate);
1633 rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate);
1634 rs.r[wNumSubRanges].dRES = 0;
1635 wNumSubRanges++;
1636 dev_dbg(&agdev->gadget->dev,
1637 "%s(): clk %d: rate ID %d: %d\n",
1638 __func__, entity_id, wNumSubRanges, srate);
1639 }
1640 rs.wNumSubRanges = cpu_to_le16(wNumSubRanges);
1641 value = min_t(unsigned int, w_length, ranges_lay3_size(rs));
1642 dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n",
1643 __func__, rs.wNumSubRanges, value);
1644 memcpy(req->buf, &rs, value);
1645 } else {
1646 dev_err(&agdev->gadget->dev,
1647 "%s:%d control_selector=%d TODO!\n",
1648 __func__, __LINE__, control_selector);
1649 }
1650 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1651 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1652 unsigned int is_playback = 0;
1653
1654 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1655 is_playback = 1;
1656
1657 if (control_selector == UAC_FU_VOLUME) {
1658 struct cntrl_range_lay2 r;
1659 s16 max_db, min_db, res_db;
1660
1661 if (is_playback) {
1662 max_db = opts->p_volume_max;
1663 min_db = opts->p_volume_min;
1664 res_db = opts->p_volume_res;
1665 } else {
1666 max_db = opts->c_volume_max;
1667 min_db = opts->c_volume_min;
1668 res_db = opts->c_volume_res;
1669 }
1670
1671 r.wMAX = cpu_to_le16(max_db);
1672 r.wMIN = cpu_to_le16(min_db);
1673 r.wRES = cpu_to_le16(res_db);
1674 r.wNumSubRanges = cpu_to_le16(1);
1675
1676 value = min_t(unsigned int, w_length, sizeof(r));
1677 memcpy(req->buf, &r, value);
1678 } else {
1679 dev_err(&agdev->gadget->dev,
1680 "%s:%d control_selector=%d TODO!\n",
1681 __func__, __LINE__, control_selector);
1682 }
1683 } else {
1684 dev_err(&agdev->gadget->dev,
1685 "%s:%d entity_id=%d control_selector=%d TODO!\n",
1686 __func__, __LINE__, entity_id, control_selector);
1687 }
1688
1689 return value;
1690}
1691
1692static int
1693ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1694{
1695 if (cr->bRequest == UAC2_CS_CUR)
1696 return in_rq_cur(fn, cr);
1697 else if (cr->bRequest == UAC2_CS_RANGE)
1698 return in_rq_range(fn, cr);
1699 else
1700 return -EOPNOTSUPP;
1701}
1702
1703static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req)
1704{
1705 struct usb_function *fn = ep->driver_data;
1706 struct g_audio *agdev = func_to_g_audio(f: fn);
1707 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1708 u32 val;
1709
1710 if (req->actual != 4)
1711 return;
1712
1713 val = le32_to_cpu(*((__le32 *)req->buf));
1714 dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val);
1715 if (uac2->clock_id == USB_IN_CLK_ID) {
1716 u_audio_set_playback_srate(audio_dev: agdev, srate: val);
1717 } else if (uac2->clock_id == USB_OUT_CLK_ID) {
1718 u_audio_set_capture_srate(audio_dev: agdev, srate: val);
1719 }
1720}
1721
1722static void
1723out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1724{
1725 struct g_audio *agdev = req->context;
1726 struct usb_composite_dev *cdev = agdev->func.config->cdev;
1727 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1728 struct f_uac2 *uac2 = func_to_uac2(f: &agdev->func);
1729 struct usb_ctrlrequest *cr = &uac2->setup_cr;
1730 u16 w_index = le16_to_cpu(cr->wIndex);
1731 u16 w_value = le16_to_cpu(cr->wValue);
1732 u8 entity_id = (w_index >> 8) & 0xff;
1733 u8 control_selector = w_value >> 8;
1734
1735 if (req->status != 0) {
1736 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1737 return;
1738 }
1739
1740 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1741 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1742 unsigned int is_playback = 0;
1743
1744 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1745 is_playback = 1;
1746
1747 if (control_selector == UAC_FU_MUTE) {
1748 u8 mute = *(u8 *)req->buf;
1749
1750 u_audio_set_mute(g_audio: agdev, playback: is_playback, val: mute);
1751
1752 return;
1753 } else if (control_selector == UAC_FU_VOLUME) {
1754 struct cntrl_cur_lay2 *c = req->buf;
1755 s16 volume;
1756
1757 volume = le16_to_cpu(c->wCUR);
1758 u_audio_set_volume(g_audio: agdev, playback: is_playback, val: volume);
1759
1760 return;
1761 } else {
1762 dev_err(&agdev->gadget->dev,
1763 "%s:%d control_selector=%d TODO!\n",
1764 __func__, __LINE__, control_selector);
1765 usb_ep_set_halt(ep);
1766 }
1767 }
1768}
1769
1770static int
1771out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1772{
1773 struct usb_composite_dev *cdev = fn->config->cdev;
1774 struct usb_request *req = fn->config->cdev->req;
1775 struct g_audio *agdev = func_to_g_audio(f: fn);
1776 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1777 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1778 u16 w_length = le16_to_cpu(cr->wLength);
1779 u16 w_index = le16_to_cpu(cr->wIndex);
1780 u16 w_value = le16_to_cpu(cr->wValue);
1781 u8 entity_id = (w_index >> 8) & 0xff;
1782 u8 control_selector = w_value >> 8;
1783 u8 clock_id = w_index >> 8;
1784
1785 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1786 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1787 dev_dbg(&agdev->gadget->dev,
1788 "control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id);
1789 cdev->gadget->ep0->driver_data = fn;
1790 uac2->clock_id = clock_id;
1791 req->complete = uac2_cs_control_sam_freq;
1792 return w_length;
1793 }
1794 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1795 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1796 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1797 req->context = agdev;
1798 req->complete = out_rq_cur_complete;
1799
1800 return w_length;
1801 } else {
1802 dev_err(&agdev->gadget->dev,
1803 "%s:%d entity_id=%d control_selector=%d TODO!\n",
1804 __func__, __LINE__, entity_id, control_selector);
1805 }
1806 return -EOPNOTSUPP;
1807}
1808
1809static int
1810setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1811{
1812 struct f_uac2 *uac2 = func_to_uac2(f: fn);
1813 struct g_audio *agdev = func_to_g_audio(f: fn);
1814 u16 w_index = le16_to_cpu(cr->wIndex);
1815 u8 intf = w_index & 0xff;
1816
1817 if (intf != uac2->ac_intf) {
1818 dev_err(&agdev->gadget->dev,
1819 "%s:%d Error!\n", __func__, __LINE__);
1820 return -EOPNOTSUPP;
1821 }
1822
1823 if (cr->bRequestType & USB_DIR_IN)
1824 return ac_rq_in(fn, cr);
1825 else if (cr->bRequest == UAC2_CS_CUR)
1826 return out_rq_cur(fn, cr);
1827
1828 return -EOPNOTSUPP;
1829}
1830
1831static int
1832afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1833{
1834 struct usb_composite_dev *cdev = fn->config->cdev;
1835 struct g_audio *agdev = func_to_g_audio(f: fn);
1836 struct usb_request *req = cdev->req;
1837 u16 w_length = le16_to_cpu(cr->wLength);
1838 int value = -EOPNOTSUPP;
1839
1840 /* Only Class specific requests are supposed to reach here */
1841 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1842 return -EOPNOTSUPP;
1843
1844 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1845 value = setup_rq_inf(fn, cr);
1846 else
1847 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1848 __func__, __LINE__);
1849
1850 if (value >= 0) {
1851 req->length = value;
1852 req->zero = value < w_length;
1853 value = usb_ep_queue(ep: cdev->gadget->ep0, req, GFP_ATOMIC);
1854 if (value < 0) {
1855 dev_err(&agdev->gadget->dev,
1856 "%s:%d Error!\n", __func__, __LINE__);
1857 req->status = 0;
1858 }
1859 }
1860
1861 return value;
1862}
1863
1864static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1865{
1866 return container_of(to_config_group(item), struct f_uac2_opts,
1867 func_inst.group);
1868}
1869
1870static void f_uac2_attr_release(struct config_item *item)
1871{
1872 struct f_uac2_opts *opts = to_f_uac2_opts(item);
1873
1874 usb_put_function_instance(fi: &opts->func_inst);
1875}
1876
1877static struct configfs_item_operations f_uac2_item_ops = {
1878 .release = f_uac2_attr_release,
1879};
1880
1881#define uac2_kstrtou8 kstrtou8
1882#define uac2_kstrtou32 kstrtou32
1883#define uac2_kstrtos16 kstrtos16
1884#define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1885
1886static const char *u8_fmt = "%u\n";
1887static const char *u32_fmt = "%u\n";
1888static const char *s16_fmt = "%hd\n";
1889static const char *bool_fmt = "%u\n";
1890
1891#define UAC2_ATTRIBUTE(type, name) \
1892static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1893 char *page) \
1894{ \
1895 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1896 int result; \
1897 \
1898 mutex_lock(&opts->lock); \
1899 result = sprintf(page, type##_fmt, opts->name); \
1900 mutex_unlock(&opts->lock); \
1901 \
1902 return result; \
1903} \
1904 \
1905static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
1906 const char *page, size_t len) \
1907{ \
1908 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1909 int ret; \
1910 type num; \
1911 \
1912 mutex_lock(&opts->lock); \
1913 if (opts->refcnt) { \
1914 ret = -EBUSY; \
1915 goto end; \
1916 } \
1917 \
1918 ret = uac2_kstrto##type(page, 0, &num); \
1919 if (ret) \
1920 goto end; \
1921 \
1922 opts->name = num; \
1923 ret = len; \
1924 \
1925end: \
1926 mutex_unlock(&opts->lock); \
1927 return ret; \
1928} \
1929 \
1930CONFIGFS_ATTR(f_uac2_opts_, name)
1931
1932#define UAC2_ATTRIBUTE_SYNC(name) \
1933static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1934 char *page) \
1935{ \
1936 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1937 int result; \
1938 char *str; \
1939 \
1940 mutex_lock(&opts->lock); \
1941 switch (opts->name) { \
1942 case USB_ENDPOINT_SYNC_ASYNC: \
1943 str = "async"; \
1944 break; \
1945 case USB_ENDPOINT_SYNC_ADAPTIVE: \
1946 str = "adaptive"; \
1947 break; \
1948 default: \
1949 str = "unknown"; \
1950 break; \
1951 } \
1952 result = sprintf(page, "%s\n", str); \
1953 mutex_unlock(&opts->lock); \
1954 \
1955 return result; \
1956} \
1957 \
1958static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
1959 const char *page, size_t len) \
1960{ \
1961 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1962 int ret = 0; \
1963 \
1964 mutex_lock(&opts->lock); \
1965 if (opts->refcnt) { \
1966 ret = -EBUSY; \
1967 goto end; \
1968 } \
1969 \
1970 if (!strncmp(page, "async", 5)) \
1971 opts->name = USB_ENDPOINT_SYNC_ASYNC; \
1972 else if (!strncmp(page, "adaptive", 8)) \
1973 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE; \
1974 else { \
1975 ret = -EINVAL; \
1976 goto end; \
1977 } \
1978 \
1979 ret = len; \
1980 \
1981end: \
1982 mutex_unlock(&opts->lock); \
1983 return ret; \
1984} \
1985 \
1986CONFIGFS_ATTR(f_uac2_opts_, name)
1987
1988#define UAC2_RATE_ATTRIBUTE(name) \
1989static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1990 char *page) \
1991{ \
1992 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1993 int result = 0; \
1994 int i; \
1995 \
1996 mutex_lock(&opts->lock); \
1997 page[0] = '\0'; \
1998 for (i = 0; i < UAC_MAX_RATES; i++) { \
1999 if (opts->name##s[i] == 0) \
2000 break; \
2001 result += sprintf(page + strlen(page), "%u,", \
2002 opts->name##s[i]); \
2003 } \
2004 if (strlen(page) > 0) \
2005 page[strlen(page) - 1] = '\n'; \
2006 mutex_unlock(&opts->lock); \
2007 \
2008 return result; \
2009} \
2010 \
2011static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
2012 const char *page, size_t len) \
2013{ \
2014 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
2015 char *split_page = NULL; \
2016 int ret = -EINVAL; \
2017 char *token; \
2018 u32 num; \
2019 int i; \
2020 \
2021 mutex_lock(&opts->lock); \
2022 if (opts->refcnt) { \
2023 ret = -EBUSY; \
2024 goto end; \
2025 } \
2026 \
2027 i = 0; \
2028 memset(opts->name##s, 0x00, sizeof(opts->name##s)); \
2029 split_page = kstrdup(page, GFP_KERNEL); \
2030 while ((token = strsep(&split_page, ",")) != NULL) { \
2031 ret = kstrtou32(token, 0, &num); \
2032 if (ret) \
2033 goto end; \
2034 \
2035 opts->name##s[i++] = num; \
2036 ret = len; \
2037 }; \
2038 \
2039end: \
2040 kfree(split_page); \
2041 mutex_unlock(&opts->lock); \
2042 return ret; \
2043} \
2044 \
2045CONFIGFS_ATTR(f_uac2_opts_, name)
2046
2047#define UAC2_ATTRIBUTE_STRING(name) \
2048static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
2049 char *page) \
2050{ \
2051 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
2052 int result; \
2053 \
2054 mutex_lock(&opts->lock); \
2055 result = sysfs_emit(page, "%s", opts->name); \
2056 mutex_unlock(&opts->lock); \
2057 \
2058 return result; \
2059} \
2060 \
2061static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
2062 const char *page, size_t len) \
2063{ \
2064 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
2065 int ret = len; \
2066 \
2067 mutex_lock(&opts->lock); \
2068 if (opts->refcnt) { \
2069 ret = -EBUSY; \
2070 goto end; \
2071 } \
2072 \
2073 if (len && page[len - 1] == '\n') \
2074 len--; \
2075 \
2076 scnprintf(opts->name, min(sizeof(opts->name), len + 1), \
2077 "%s", page); \
2078 \
2079end: \
2080 mutex_unlock(&opts->lock); \
2081 return ret; \
2082} \
2083 \
2084CONFIGFS_ATTR(f_uac2_opts_, name)
2085
2086UAC2_ATTRIBUTE(u32, p_chmask);
2087UAC2_RATE_ATTRIBUTE(p_srate);
2088UAC2_ATTRIBUTE(u32, p_ssize);
2089UAC2_ATTRIBUTE(u8, p_hs_bint);
2090UAC2_ATTRIBUTE(u32, c_chmask);
2091UAC2_RATE_ATTRIBUTE(c_srate);
2092UAC2_ATTRIBUTE_SYNC(c_sync);
2093UAC2_ATTRIBUTE(u32, c_ssize);
2094UAC2_ATTRIBUTE(u8, c_hs_bint);
2095UAC2_ATTRIBUTE(u32, req_number);
2096
2097UAC2_ATTRIBUTE(bool, p_mute_present);
2098UAC2_ATTRIBUTE(bool, p_volume_present);
2099UAC2_ATTRIBUTE(s16, p_volume_min);
2100UAC2_ATTRIBUTE(s16, p_volume_max);
2101UAC2_ATTRIBUTE(s16, p_volume_res);
2102
2103UAC2_ATTRIBUTE(bool, c_mute_present);
2104UAC2_ATTRIBUTE(bool, c_volume_present);
2105UAC2_ATTRIBUTE(s16, c_volume_min);
2106UAC2_ATTRIBUTE(s16, c_volume_max);
2107UAC2_ATTRIBUTE(s16, c_volume_res);
2108UAC2_ATTRIBUTE(u32, fb_max);
2109UAC2_ATTRIBUTE_STRING(function_name);
2110UAC2_ATTRIBUTE_STRING(if_ctrl_name);
2111UAC2_ATTRIBUTE_STRING(clksrc_in_name);
2112UAC2_ATTRIBUTE_STRING(clksrc_out_name);
2113
2114UAC2_ATTRIBUTE_STRING(p_it_name);
2115UAC2_ATTRIBUTE_STRING(p_it_ch_name);
2116UAC2_ATTRIBUTE_STRING(p_ot_name);
2117UAC2_ATTRIBUTE_STRING(p_fu_vol_name);
2118
2119UAC2_ATTRIBUTE_STRING(c_it_name);
2120UAC2_ATTRIBUTE_STRING(c_it_ch_name);
2121UAC2_ATTRIBUTE_STRING(c_ot_name);
2122UAC2_ATTRIBUTE_STRING(c_fu_vol_name);
2123
2124UAC2_ATTRIBUTE(s16, p_terminal_type);
2125UAC2_ATTRIBUTE(s16, c_terminal_type);
2126
2127
2128static struct configfs_attribute *f_uac2_attrs[] = {
2129 &f_uac2_opts_attr_p_chmask,
2130 &f_uac2_opts_attr_p_srate,
2131 &f_uac2_opts_attr_p_ssize,
2132 &f_uac2_opts_attr_p_hs_bint,
2133 &f_uac2_opts_attr_c_chmask,
2134 &f_uac2_opts_attr_c_srate,
2135 &f_uac2_opts_attr_c_ssize,
2136 &f_uac2_opts_attr_c_hs_bint,
2137 &f_uac2_opts_attr_c_sync,
2138 &f_uac2_opts_attr_req_number,
2139 &f_uac2_opts_attr_fb_max,
2140
2141 &f_uac2_opts_attr_p_mute_present,
2142 &f_uac2_opts_attr_p_volume_present,
2143 &f_uac2_opts_attr_p_volume_min,
2144 &f_uac2_opts_attr_p_volume_max,
2145 &f_uac2_opts_attr_p_volume_res,
2146
2147 &f_uac2_opts_attr_c_mute_present,
2148 &f_uac2_opts_attr_c_volume_present,
2149 &f_uac2_opts_attr_c_volume_min,
2150 &f_uac2_opts_attr_c_volume_max,
2151 &f_uac2_opts_attr_c_volume_res,
2152
2153 &f_uac2_opts_attr_function_name,
2154 &f_uac2_opts_attr_if_ctrl_name,
2155 &f_uac2_opts_attr_clksrc_in_name,
2156 &f_uac2_opts_attr_clksrc_out_name,
2157
2158 &f_uac2_opts_attr_p_it_name,
2159 &f_uac2_opts_attr_p_it_ch_name,
2160 &f_uac2_opts_attr_p_ot_name,
2161 &f_uac2_opts_attr_p_fu_vol_name,
2162
2163 &f_uac2_opts_attr_c_it_name,
2164 &f_uac2_opts_attr_c_it_ch_name,
2165 &f_uac2_opts_attr_c_ot_name,
2166 &f_uac2_opts_attr_c_fu_vol_name,
2167
2168 &f_uac2_opts_attr_p_terminal_type,
2169 &f_uac2_opts_attr_c_terminal_type,
2170
2171 NULL,
2172};
2173
2174static const struct config_item_type f_uac2_func_type = {
2175 .ct_item_ops = &f_uac2_item_ops,
2176 .ct_attrs = f_uac2_attrs,
2177 .ct_owner = THIS_MODULE,
2178};
2179
2180static void afunc_free_inst(struct usb_function_instance *f)
2181{
2182 struct f_uac2_opts *opts;
2183
2184 opts = container_of(f, struct f_uac2_opts, func_inst);
2185 kfree(objp: opts);
2186}
2187
2188static struct usb_function_instance *afunc_alloc_inst(void)
2189{
2190 struct f_uac2_opts *opts;
2191
2192 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2193 if (!opts)
2194 return ERR_PTR(error: -ENOMEM);
2195
2196 mutex_init(&opts->lock);
2197 opts->func_inst.free_func_inst = afunc_free_inst;
2198
2199 config_group_init_type_name(group: &opts->func_inst.group, name: "",
2200 type: &f_uac2_func_type);
2201
2202 opts->p_chmask = UAC2_DEF_PCHMASK;
2203 opts->p_srates[0] = UAC2_DEF_PSRATE;
2204 opts->p_ssize = UAC2_DEF_PSSIZE;
2205 opts->p_hs_bint = UAC2_DEF_PHSBINT;
2206 opts->c_chmask = UAC2_DEF_CCHMASK;
2207 opts->c_srates[0] = UAC2_DEF_CSRATE;
2208 opts->c_ssize = UAC2_DEF_CSSIZE;
2209 opts->c_hs_bint = UAC2_DEF_CHSBINT;
2210 opts->c_sync = UAC2_DEF_CSYNC;
2211
2212 opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
2213 opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
2214 opts->p_volume_min = UAC2_DEF_MIN_DB;
2215 opts->p_volume_max = UAC2_DEF_MAX_DB;
2216 opts->p_volume_res = UAC2_DEF_RES_DB;
2217
2218 opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
2219 opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
2220 opts->c_volume_min = UAC2_DEF_MIN_DB;
2221 opts->c_volume_max = UAC2_DEF_MAX_DB;
2222 opts->c_volume_res = UAC2_DEF_RES_DB;
2223
2224 opts->req_number = UAC2_DEF_REQ_NUM;
2225 opts->fb_max = FBACK_FAST_MAX;
2226
2227 scnprintf(buf: opts->function_name, size: sizeof(opts->function_name), fmt: "Source/Sink");
2228 scnprintf(buf: opts->if_ctrl_name, size: sizeof(opts->if_ctrl_name), fmt: "Topology Control");
2229 scnprintf(buf: opts->clksrc_in_name, size: sizeof(opts->clksrc_in_name), fmt: "Input Clock");
2230 scnprintf(buf: opts->clksrc_out_name, size: sizeof(opts->clksrc_out_name), fmt: "Output Clock");
2231
2232 scnprintf(buf: opts->p_it_name, size: sizeof(opts->p_it_name), fmt: "USBD Out");
2233 scnprintf(buf: opts->p_it_ch_name, size: sizeof(opts->p_it_ch_name), fmt: "Capture Channels");
2234 scnprintf(buf: opts->p_ot_name, size: sizeof(opts->p_ot_name), fmt: "USBH In");
2235 scnprintf(buf: opts->p_fu_vol_name, size: sizeof(opts->p_fu_vol_name), fmt: "Capture Volume");
2236
2237 scnprintf(buf: opts->c_it_name, size: sizeof(opts->c_it_name), fmt: "USBH Out");
2238 scnprintf(buf: opts->c_it_ch_name, size: sizeof(opts->c_it_ch_name), fmt: "Playback Channels");
2239 scnprintf(buf: opts->c_ot_name, size: sizeof(opts->c_ot_name), fmt: "USBD In");
2240 scnprintf(buf: opts->c_fu_vol_name, size: sizeof(opts->c_fu_vol_name), fmt: "Playback Volume");
2241
2242 opts->p_terminal_type = UAC2_DEF_P_TERM_TYPE;
2243 opts->c_terminal_type = UAC2_DEF_C_TERM_TYPE;
2244
2245 return &opts->func_inst;
2246}
2247
2248static void afunc_free(struct usb_function *f)
2249{
2250 struct g_audio *agdev;
2251 struct f_uac2_opts *opts;
2252
2253 agdev = func_to_g_audio(f);
2254 opts = container_of(f->fi, struct f_uac2_opts, func_inst);
2255 kfree(objp: agdev);
2256 mutex_lock(&opts->lock);
2257 --opts->refcnt;
2258 mutex_unlock(lock: &opts->lock);
2259}
2260
2261static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
2262{
2263 struct g_audio *agdev = func_to_g_audio(f);
2264
2265 g_audio_cleanup(g_audio: agdev);
2266 usb_free_all_descriptors(f);
2267
2268 agdev->gadget = NULL;
2269
2270 kfree(objp: out_feature_unit_desc);
2271 out_feature_unit_desc = NULL;
2272 kfree(objp: in_feature_unit_desc);
2273 in_feature_unit_desc = NULL;
2274}
2275
2276static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
2277{
2278 struct f_uac2 *uac2;
2279 struct f_uac2_opts *opts;
2280
2281 uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
2282 if (uac2 == NULL)
2283 return ERR_PTR(error: -ENOMEM);
2284
2285 opts = container_of(fi, struct f_uac2_opts, func_inst);
2286 mutex_lock(&opts->lock);
2287 ++opts->refcnt;
2288 mutex_unlock(lock: &opts->lock);
2289
2290 uac2->g_audio.func.name = "uac2_func";
2291 uac2->g_audio.func.bind = afunc_bind;
2292 uac2->g_audio.func.unbind = afunc_unbind;
2293 uac2->g_audio.func.set_alt = afunc_set_alt;
2294 uac2->g_audio.func.get_alt = afunc_get_alt;
2295 uac2->g_audio.func.disable = afunc_disable;
2296 uac2->g_audio.func.suspend = afunc_suspend;
2297 uac2->g_audio.func.setup = afunc_setup;
2298 uac2->g_audio.func.free_func = afunc_free;
2299
2300 return &uac2->g_audio.func;
2301}
2302
2303DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
2304MODULE_DESCRIPTION("USB Audio Class 2.0 Function");
2305MODULE_LICENSE("GPL");
2306MODULE_AUTHOR("Yadwinder Singh");
2307MODULE_AUTHOR("Jaswinder Singh");
2308MODULE_AUTHOR("Ruslan Bilovol");
2309

source code of linux/drivers/usb/gadget/function/f_uac2.c