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