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 #include "u_uac2.h"
19
20 /* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
21 #define UAC2_CHANNEL_MASK 0x07FFFFFF
22
23 /*
24 * The driver implements a simple UAC_2 topology.
25 * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
26 * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
27 * Capture and Playback sampling rates are independently
28 * controlled by two clock sources :
29 * CLK_5 := c_srate, and CLK_6 := p_srate
30 */
31 #define USB_OUT_CLK_ID (out_clk_src_desc.bClockID)
32 #define USB_IN_CLK_ID (in_clk_src_desc.bClockID)
33 #define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID)
34 #define USB_IN_FU_ID (in_feature_unit_desc->bUnitID)
35
36 #define CONTROL_ABSENT 0
37 #define CONTROL_RDONLY 1
38 #define CONTROL_RDWR 3
39
40 #define CLK_FREQ_CTRL 0
41 #define CLK_VLD_CTRL 2
42 #define FU_MUTE_CTRL 0
43 #define FU_VOL_CTRL 2
44
45 #define COPY_CTRL 0
46 #define CONN_CTRL 2
47 #define OVRLD_CTRL 4
48 #define CLSTR_CTRL 6
49 #define UNFLW_CTRL 8
50 #define OVFLW_CTRL 10
51
52 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
53 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
54 #define FUIN_EN(_opts) (EPIN_EN(_opts) \
55 && ((_opts)->p_mute_present \
56 || (_opts)->p_volume_present))
57 #define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
58 && ((_opts)->c_mute_present \
59 || (_opts)->c_volume_present))
60 #define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
61
62 struct f_uac2 {
63 struct g_audio g_audio;
64 u8 ac_intf, as_in_intf, as_out_intf;
65 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
66
67 struct usb_ctrlrequest setup_cr; /* will be used in data stage */
68
69 /* Interrupt IN endpoint of AC interface */
70 struct usb_ep *int_ep;
71 atomic_t int_count;
72 };
73
func_to_uac2(struct usb_function * f)74 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
75 {
76 return container_of(f, struct f_uac2, g_audio.func);
77 }
78
79 static inline
g_audio_to_uac2_opts(struct g_audio * agdev)80 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
81 {
82 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
83 }
84
85 static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
86
87 /* --------- USB Function Interface ------------- */
88
89 enum {
90 STR_ASSOC,
91 STR_IF_CTRL,
92 STR_CLKSRC_IN,
93 STR_CLKSRC_OUT,
94 STR_USB_IT,
95 STR_IO_IT,
96 STR_USB_OT,
97 STR_IO_OT,
98 STR_FU_IN,
99 STR_FU_OUT,
100 STR_AS_OUT_ALT0,
101 STR_AS_OUT_ALT1,
102 STR_AS_IN_ALT0,
103 STR_AS_IN_ALT1,
104 };
105
106 static char clksrc_in[8];
107 static char clksrc_out[8];
108
109 static struct usb_string strings_fn[] = {
110 [STR_ASSOC].s = "Source/Sink",
111 [STR_IF_CTRL].s = "Topology Control",
112 [STR_CLKSRC_IN].s = clksrc_in,
113 [STR_CLKSRC_OUT].s = clksrc_out,
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 struct usb_gadget_strings str_fn = {
128 .language = 0x0409, /* en-us */
129 .strings = strings_fn,
130 };
131
132 static struct usb_gadget_strings *fn_strings[] = {
133 &str_fn,
134 NULL,
135 };
136
137 static struct usb_interface_assoc_descriptor iad_desc = {
138 .bLength = sizeof iad_desc,
139 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
140
141 .bFirstInterface = 0,
142 .bInterfaceCount = 3,
143 .bFunctionClass = USB_CLASS_AUDIO,
144 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
145 .bFunctionProtocol = UAC_VERSION_2,
146 };
147
148 /* Audio Control Interface */
149 static struct usb_interface_descriptor std_ac_if_desc = {
150 .bLength = sizeof std_ac_if_desc,
151 .bDescriptorType = USB_DT_INTERFACE,
152
153 .bAlternateSetting = 0,
154 /* .bNumEndpoints = DYNAMIC */
155 .bInterfaceClass = USB_CLASS_AUDIO,
156 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
157 .bInterfaceProtocol = UAC_VERSION_2,
158 };
159
160 /* Clock source for IN traffic */
161 static struct uac_clock_source_descriptor in_clk_src_desc = {
162 .bLength = sizeof in_clk_src_desc,
163 .bDescriptorType = USB_DT_CS_INTERFACE,
164
165 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
166 /* .bClockID = DYNAMIC */
167 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
168 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
169 .bAssocTerminal = 0,
170 };
171
172 /* Clock source for OUT traffic */
173 static struct uac_clock_source_descriptor out_clk_src_desc = {
174 .bLength = sizeof out_clk_src_desc,
175 .bDescriptorType = USB_DT_CS_INTERFACE,
176
177 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
178 /* .bClockID = DYNAMIC */
179 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
180 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
181 .bAssocTerminal = 0,
182 };
183
184 /* Input Terminal for USB_OUT */
185 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
186 .bLength = sizeof usb_out_it_desc,
187 .bDescriptorType = USB_DT_CS_INTERFACE,
188
189 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
190 /* .bTerminalID = DYNAMIC */
191 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
192 .bAssocTerminal = 0,
193 /* .bCSourceID = DYNAMIC */
194 .iChannelNames = 0,
195 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
196 };
197
198 /* Input Terminal for I/O-In */
199 static struct uac2_input_terminal_descriptor io_in_it_desc = {
200 .bLength = sizeof io_in_it_desc,
201 .bDescriptorType = USB_DT_CS_INTERFACE,
202
203 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
204 /* .bTerminalID = DYNAMIC */
205 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
206 .bAssocTerminal = 0,
207 /* .bCSourceID = DYNAMIC */
208 .iChannelNames = 0,
209 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
210 };
211
212 /* Ouput Terminal for USB_IN */
213 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
214 .bLength = sizeof usb_in_ot_desc,
215 .bDescriptorType = USB_DT_CS_INTERFACE,
216
217 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
218 /* .bTerminalID = DYNAMIC */
219 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
220 .bAssocTerminal = 0,
221 /* .bSourceID = DYNAMIC */
222 /* .bCSourceID = DYNAMIC */
223 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
224 };
225
226 /* Ouput Terminal for I/O-Out */
227 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
228 .bLength = sizeof io_out_ot_desc,
229 .bDescriptorType = USB_DT_CS_INTERFACE,
230
231 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
232 /* .bTerminalID = DYNAMIC */
233 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
234 .bAssocTerminal = 0,
235 /* .bSourceID = DYNAMIC */
236 /* .bCSourceID = DYNAMIC */
237 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
238 };
239
240 static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
241 static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
242
243 static struct uac2_ac_header_descriptor ac_hdr_desc = {
244 .bLength = sizeof ac_hdr_desc,
245 .bDescriptorType = USB_DT_CS_INTERFACE,
246
247 .bDescriptorSubtype = UAC_MS_HEADER,
248 .bcdADC = cpu_to_le16(0x200),
249 .bCategory = UAC2_FUNCTION_IO_BOX,
250 /* .wTotalLength = DYNAMIC */
251 .bmControls = 0,
252 };
253
254 /* AC IN Interrupt Endpoint */
255 static struct usb_endpoint_descriptor fs_ep_int_desc = {
256 .bLength = USB_DT_ENDPOINT_SIZE,
257 .bDescriptorType = USB_DT_ENDPOINT,
258
259 .bEndpointAddress = USB_DIR_IN,
260 .bmAttributes = USB_ENDPOINT_XFER_INT,
261 .wMaxPacketSize = cpu_to_le16(6),
262 .bInterval = 1,
263 };
264
265 static struct usb_endpoint_descriptor hs_ep_int_desc = {
266 .bLength = USB_DT_ENDPOINT_SIZE,
267 .bDescriptorType = USB_DT_ENDPOINT,
268
269 .bmAttributes = USB_ENDPOINT_XFER_INT,
270 .wMaxPacketSize = cpu_to_le16(6),
271 .bInterval = 4,
272 };
273
274 static struct usb_endpoint_descriptor ss_ep_int_desc = {
275 .bLength = USB_DT_ENDPOINT_SIZE,
276 .bDescriptorType = USB_DT_ENDPOINT,
277
278 .bEndpointAddress = USB_DIR_IN,
279 .bmAttributes = USB_ENDPOINT_XFER_INT,
280 .wMaxPacketSize = cpu_to_le16(6),
281 .bInterval = 4,
282 };
283
284 /* Audio Streaming OUT Interface - Alt0 */
285 static struct usb_interface_descriptor std_as_out_if0_desc = {
286 .bLength = sizeof std_as_out_if0_desc,
287 .bDescriptorType = USB_DT_INTERFACE,
288
289 .bAlternateSetting = 0,
290 .bNumEndpoints = 0,
291 .bInterfaceClass = USB_CLASS_AUDIO,
292 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
293 .bInterfaceProtocol = UAC_VERSION_2,
294 };
295
296 /* Audio Streaming OUT Interface - Alt1 */
297 static struct usb_interface_descriptor std_as_out_if1_desc = {
298 .bLength = sizeof std_as_out_if1_desc,
299 .bDescriptorType = USB_DT_INTERFACE,
300
301 .bAlternateSetting = 1,
302 .bNumEndpoints = 1,
303 .bInterfaceClass = USB_CLASS_AUDIO,
304 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
305 .bInterfaceProtocol = UAC_VERSION_2,
306 };
307
308 /* Audio Stream OUT Intface Desc */
309 static struct uac2_as_header_descriptor as_out_hdr_desc = {
310 .bLength = sizeof as_out_hdr_desc,
311 .bDescriptorType = USB_DT_CS_INTERFACE,
312
313 .bDescriptorSubtype = UAC_AS_GENERAL,
314 /* .bTerminalLink = DYNAMIC */
315 .bmControls = 0,
316 .bFormatType = UAC_FORMAT_TYPE_I,
317 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
318 .iChannelNames = 0,
319 };
320
321 /* Audio USB_OUT Format */
322 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
323 .bLength = sizeof as_out_fmt1_desc,
324 .bDescriptorType = USB_DT_CS_INTERFACE,
325 .bDescriptorSubtype = UAC_FORMAT_TYPE,
326 .bFormatType = UAC_FORMAT_TYPE_I,
327 };
328
329 /* STD AS ISO OUT Endpoint */
330 static struct usb_endpoint_descriptor fs_epout_desc = {
331 .bLength = USB_DT_ENDPOINT_SIZE,
332 .bDescriptorType = USB_DT_ENDPOINT,
333
334 .bEndpointAddress = USB_DIR_OUT,
335 /* .bmAttributes = DYNAMIC */
336 /* .wMaxPacketSize = DYNAMIC */
337 .bInterval = 1,
338 };
339
340 static struct usb_endpoint_descriptor hs_epout_desc = {
341 .bLength = USB_DT_ENDPOINT_SIZE,
342 .bDescriptorType = USB_DT_ENDPOINT,
343
344 /* .bmAttributes = DYNAMIC */
345 /* .wMaxPacketSize = DYNAMIC */
346 .bInterval = 4,
347 };
348
349 static struct usb_endpoint_descriptor ss_epout_desc = {
350 .bLength = USB_DT_ENDPOINT_SIZE,
351 .bDescriptorType = USB_DT_ENDPOINT,
352
353 .bEndpointAddress = USB_DIR_OUT,
354 /* .bmAttributes = DYNAMIC */
355 /* .wMaxPacketSize = DYNAMIC */
356 .bInterval = 4,
357 };
358
359 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
360 .bLength = sizeof(ss_epout_desc_comp),
361 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
362 .bMaxBurst = 0,
363 .bmAttributes = 0,
364 /* wBytesPerInterval = DYNAMIC */
365 };
366
367 /* CS AS ISO OUT Endpoint */
368 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
369 .bLength = sizeof as_iso_out_desc,
370 .bDescriptorType = USB_DT_CS_ENDPOINT,
371
372 .bDescriptorSubtype = UAC_EP_GENERAL,
373 .bmAttributes = 0,
374 .bmControls = 0,
375 .bLockDelayUnits = 0,
376 .wLockDelay = 0,
377 };
378
379 /* STD AS ISO IN Feedback Endpoint */
380 static struct usb_endpoint_descriptor fs_epin_fback_desc = {
381 .bLength = USB_DT_ENDPOINT_SIZE,
382 .bDescriptorType = USB_DT_ENDPOINT,
383
384 .bEndpointAddress = USB_DIR_IN,
385 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
386 .wMaxPacketSize = cpu_to_le16(3),
387 .bInterval = 1,
388 };
389
390 static struct usb_endpoint_descriptor hs_epin_fback_desc = {
391 .bLength = USB_DT_ENDPOINT_SIZE,
392 .bDescriptorType = USB_DT_ENDPOINT,
393
394 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
395 .wMaxPacketSize = cpu_to_le16(4),
396 .bInterval = 4,
397 };
398
399 static struct usb_endpoint_descriptor ss_epin_fback_desc = {
400 .bLength = USB_DT_ENDPOINT_SIZE,
401 .bDescriptorType = USB_DT_ENDPOINT,
402
403 .bEndpointAddress = USB_DIR_IN,
404 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
405 .wMaxPacketSize = cpu_to_le16(4),
406 .bInterval = 4,
407 };
408
409 static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
410 .bLength = sizeof(ss_epin_fback_desc_comp),
411 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
412 .bMaxBurst = 0,
413 .bmAttributes = 0,
414 .wBytesPerInterval = cpu_to_le16(4),
415 };
416
417
418 /* Audio Streaming IN Interface - Alt0 */
419 static struct usb_interface_descriptor std_as_in_if0_desc = {
420 .bLength = sizeof std_as_in_if0_desc,
421 .bDescriptorType = USB_DT_INTERFACE,
422
423 .bAlternateSetting = 0,
424 .bNumEndpoints = 0,
425 .bInterfaceClass = USB_CLASS_AUDIO,
426 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
427 .bInterfaceProtocol = UAC_VERSION_2,
428 };
429
430 /* Audio Streaming IN Interface - Alt1 */
431 static struct usb_interface_descriptor std_as_in_if1_desc = {
432 .bLength = sizeof std_as_in_if1_desc,
433 .bDescriptorType = USB_DT_INTERFACE,
434
435 .bAlternateSetting = 1,
436 .bNumEndpoints = 1,
437 .bInterfaceClass = USB_CLASS_AUDIO,
438 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
439 .bInterfaceProtocol = UAC_VERSION_2,
440 };
441
442 /* Audio Stream IN Intface Desc */
443 static struct uac2_as_header_descriptor as_in_hdr_desc = {
444 .bLength = sizeof as_in_hdr_desc,
445 .bDescriptorType = USB_DT_CS_INTERFACE,
446
447 .bDescriptorSubtype = UAC_AS_GENERAL,
448 /* .bTerminalLink = DYNAMIC */
449 .bmControls = 0,
450 .bFormatType = UAC_FORMAT_TYPE_I,
451 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
452 .iChannelNames = 0,
453 };
454
455 /* Audio USB_IN Format */
456 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
457 .bLength = sizeof as_in_fmt1_desc,
458 .bDescriptorType = USB_DT_CS_INTERFACE,
459 .bDescriptorSubtype = UAC_FORMAT_TYPE,
460 .bFormatType = UAC_FORMAT_TYPE_I,
461 };
462
463 /* STD AS ISO IN Endpoint */
464 static struct usb_endpoint_descriptor fs_epin_desc = {
465 .bLength = USB_DT_ENDPOINT_SIZE,
466 .bDescriptorType = USB_DT_ENDPOINT,
467
468 .bEndpointAddress = USB_DIR_IN,
469 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
470 /* .wMaxPacketSize = DYNAMIC */
471 .bInterval = 1,
472 };
473
474 static struct usb_endpoint_descriptor hs_epin_desc = {
475 .bLength = USB_DT_ENDPOINT_SIZE,
476 .bDescriptorType = USB_DT_ENDPOINT,
477
478 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
479 /* .wMaxPacketSize = DYNAMIC */
480 .bInterval = 4,
481 };
482
483 static struct usb_endpoint_descriptor ss_epin_desc = {
484 .bLength = USB_DT_ENDPOINT_SIZE,
485 .bDescriptorType = USB_DT_ENDPOINT,
486
487 .bEndpointAddress = USB_DIR_IN,
488 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
489 /* .wMaxPacketSize = DYNAMIC */
490 .bInterval = 4,
491 };
492
493 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
494 .bLength = sizeof(ss_epin_desc_comp),
495 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
496 .bMaxBurst = 0,
497 .bmAttributes = 0,
498 /* wBytesPerInterval = DYNAMIC */
499 };
500
501 /* CS AS ISO IN Endpoint */
502 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
503 .bLength = sizeof as_iso_in_desc,
504 .bDescriptorType = USB_DT_CS_ENDPOINT,
505
506 .bDescriptorSubtype = UAC_EP_GENERAL,
507 .bmAttributes = 0,
508 .bmControls = 0,
509 .bLockDelayUnits = 0,
510 .wLockDelay = 0,
511 };
512
513 static struct usb_descriptor_header *fs_audio_desc[] = {
514 (struct usb_descriptor_header *)&iad_desc,
515 (struct usb_descriptor_header *)&std_ac_if_desc,
516
517 (struct usb_descriptor_header *)&ac_hdr_desc,
518 (struct usb_descriptor_header *)&in_clk_src_desc,
519 (struct usb_descriptor_header *)&out_clk_src_desc,
520 (struct usb_descriptor_header *)&usb_out_it_desc,
521 (struct usb_descriptor_header *)&out_feature_unit_desc,
522 (struct usb_descriptor_header *)&io_in_it_desc,
523 (struct usb_descriptor_header *)&usb_in_ot_desc,
524 (struct usb_descriptor_header *)&in_feature_unit_desc,
525 (struct usb_descriptor_header *)&io_out_ot_desc,
526
527 (struct usb_descriptor_header *)&fs_ep_int_desc,
528
529 (struct usb_descriptor_header *)&std_as_out_if0_desc,
530 (struct usb_descriptor_header *)&std_as_out_if1_desc,
531
532 (struct usb_descriptor_header *)&as_out_hdr_desc,
533 (struct usb_descriptor_header *)&as_out_fmt1_desc,
534 (struct usb_descriptor_header *)&fs_epout_desc,
535 (struct usb_descriptor_header *)&as_iso_out_desc,
536 (struct usb_descriptor_header *)&fs_epin_fback_desc,
537
538 (struct usb_descriptor_header *)&std_as_in_if0_desc,
539 (struct usb_descriptor_header *)&std_as_in_if1_desc,
540
541 (struct usb_descriptor_header *)&as_in_hdr_desc,
542 (struct usb_descriptor_header *)&as_in_fmt1_desc,
543 (struct usb_descriptor_header *)&fs_epin_desc,
544 (struct usb_descriptor_header *)&as_iso_in_desc,
545 NULL,
546 };
547
548 static struct usb_descriptor_header *hs_audio_desc[] = {
549 (struct usb_descriptor_header *)&iad_desc,
550 (struct usb_descriptor_header *)&std_ac_if_desc,
551
552 (struct usb_descriptor_header *)&ac_hdr_desc,
553 (struct usb_descriptor_header *)&in_clk_src_desc,
554 (struct usb_descriptor_header *)&out_clk_src_desc,
555 (struct usb_descriptor_header *)&usb_out_it_desc,
556 (struct usb_descriptor_header *)&out_feature_unit_desc,
557 (struct usb_descriptor_header *)&io_in_it_desc,
558 (struct usb_descriptor_header *)&usb_in_ot_desc,
559 (struct usb_descriptor_header *)&in_feature_unit_desc,
560 (struct usb_descriptor_header *)&io_out_ot_desc,
561
562 (struct usb_descriptor_header *)&hs_ep_int_desc,
563
564 (struct usb_descriptor_header *)&std_as_out_if0_desc,
565 (struct usb_descriptor_header *)&std_as_out_if1_desc,
566
567 (struct usb_descriptor_header *)&as_out_hdr_desc,
568 (struct usb_descriptor_header *)&as_out_fmt1_desc,
569 (struct usb_descriptor_header *)&hs_epout_desc,
570 (struct usb_descriptor_header *)&as_iso_out_desc,
571 (struct usb_descriptor_header *)&hs_epin_fback_desc,
572
573 (struct usb_descriptor_header *)&std_as_in_if0_desc,
574 (struct usb_descriptor_header *)&std_as_in_if1_desc,
575
576 (struct usb_descriptor_header *)&as_in_hdr_desc,
577 (struct usb_descriptor_header *)&as_in_fmt1_desc,
578 (struct usb_descriptor_header *)&hs_epin_desc,
579 (struct usb_descriptor_header *)&as_iso_in_desc,
580 NULL,
581 };
582
583 static struct usb_descriptor_header *ss_audio_desc[] = {
584 (struct usb_descriptor_header *)&iad_desc,
585 (struct usb_descriptor_header *)&std_ac_if_desc,
586
587 (struct usb_descriptor_header *)&ac_hdr_desc,
588 (struct usb_descriptor_header *)&in_clk_src_desc,
589 (struct usb_descriptor_header *)&out_clk_src_desc,
590 (struct usb_descriptor_header *)&usb_out_it_desc,
591 (struct usb_descriptor_header *)&out_feature_unit_desc,
592 (struct usb_descriptor_header *)&io_in_it_desc,
593 (struct usb_descriptor_header *)&usb_in_ot_desc,
594 (struct usb_descriptor_header *)&in_feature_unit_desc,
595 (struct usb_descriptor_header *)&io_out_ot_desc,
596
597 (struct usb_descriptor_header *)&ss_ep_int_desc,
598
599 (struct usb_descriptor_header *)&std_as_out_if0_desc,
600 (struct usb_descriptor_header *)&std_as_out_if1_desc,
601
602 (struct usb_descriptor_header *)&as_out_hdr_desc,
603 (struct usb_descriptor_header *)&as_out_fmt1_desc,
604 (struct usb_descriptor_header *)&ss_epout_desc,
605 (struct usb_descriptor_header *)&ss_epout_desc_comp,
606 (struct usb_descriptor_header *)&as_iso_out_desc,
607 (struct usb_descriptor_header *)&ss_epin_fback_desc,
608 (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
609
610 (struct usb_descriptor_header *)&std_as_in_if0_desc,
611 (struct usb_descriptor_header *)&std_as_in_if1_desc,
612
613 (struct usb_descriptor_header *)&as_in_hdr_desc,
614 (struct usb_descriptor_header *)&as_in_fmt1_desc,
615 (struct usb_descriptor_header *)&ss_epin_desc,
616 (struct usb_descriptor_header *)&ss_epin_desc_comp,
617 (struct usb_descriptor_header *)&as_iso_in_desc,
618 NULL,
619 };
620
621 struct cntrl_cur_lay2 {
622 __le16 wCUR;
623 };
624
625 struct cntrl_range_lay2 {
626 __le16 wNumSubRanges;
627 __le16 wMIN;
628 __le16 wMAX;
629 __le16 wRES;
630 } __packed;
631
632 struct cntrl_cur_lay3 {
633 __le32 dCUR;
634 };
635
636 struct cntrl_range_lay3 {
637 __le16 wNumSubRanges;
638 __le32 dMIN;
639 __le32 dMAX;
640 __le32 dRES;
641 } __packed;
642
set_ep_max_packet_size(const struct f_uac2_opts * uac2_opts,struct usb_endpoint_descriptor * ep_desc,enum usb_device_speed speed,bool is_playback)643 static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
644 struct usb_endpoint_descriptor *ep_desc,
645 enum usb_device_speed speed, bool is_playback)
646 {
647 int chmask, srate, ssize;
648 u16 max_size_bw, max_size_ep;
649 unsigned int factor;
650
651 switch (speed) {
652 case USB_SPEED_FULL:
653 max_size_ep = 1023;
654 factor = 1000;
655 break;
656
657 case USB_SPEED_HIGH:
658 case USB_SPEED_SUPER:
659 max_size_ep = 1024;
660 factor = 8000;
661 break;
662
663 default:
664 return -EINVAL;
665 }
666
667 if (is_playback) {
668 chmask = uac2_opts->p_chmask;
669 srate = uac2_opts->p_srate;
670 ssize = uac2_opts->p_ssize;
671 } else {
672 chmask = uac2_opts->c_chmask;
673 srate = uac2_opts->c_srate;
674 ssize = uac2_opts->c_ssize;
675 }
676
677 if (!is_playback && (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
678 // Win10 requires max packet size + 1 frame
679 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
680 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
681 max_size_bw = num_channels(chmask) * ssize *
682 (DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))));
683 } else {
684 // adding 1 frame provision for Win10
685 max_size_bw = num_channels(chmask) * ssize *
686 (DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))) + 1);
687 }
688 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
689 max_size_ep));
690
691 return 0;
692 }
693
build_fu_desc(int chmask)694 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
695 {
696 struct uac2_feature_unit_descriptor *fu_desc;
697 int channels = num_channels(chmask);
698 int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
699
700 fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
701 if (!fu_desc)
702 return NULL;
703
704 fu_desc->bLength = fu_desc_size;
705 fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
706
707 fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
708
709 /* bUnitID, bSourceID and bmaControls will be defined later */
710
711 return fu_desc;
712 }
713
714 /* Use macro to overcome line length limitation */
715 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
716
setup_headers(struct f_uac2_opts * opts,struct usb_descriptor_header ** headers,enum usb_device_speed speed)717 static void setup_headers(struct f_uac2_opts *opts,
718 struct usb_descriptor_header **headers,
719 enum usb_device_speed speed)
720 {
721 struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
722 struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
723 struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
724 struct usb_endpoint_descriptor *epout_desc;
725 struct usb_endpoint_descriptor *epin_desc;
726 struct usb_endpoint_descriptor *epin_fback_desc;
727 struct usb_endpoint_descriptor *ep_int_desc;
728 int i;
729
730 switch (speed) {
731 case USB_SPEED_FULL:
732 epout_desc = &fs_epout_desc;
733 epin_desc = &fs_epin_desc;
734 epin_fback_desc = &fs_epin_fback_desc;
735 ep_int_desc = &fs_ep_int_desc;
736 break;
737 case USB_SPEED_HIGH:
738 epout_desc = &hs_epout_desc;
739 epin_desc = &hs_epin_desc;
740 epin_fback_desc = &hs_epin_fback_desc;
741 ep_int_desc = &hs_ep_int_desc;
742 break;
743 default:
744 epout_desc = &ss_epout_desc;
745 epin_desc = &ss_epin_desc;
746 epout_desc_comp = &ss_epout_desc_comp;
747 epin_desc_comp = &ss_epin_desc_comp;
748 epin_fback_desc = &ss_epin_fback_desc;
749 epin_fback_desc_comp = &ss_epin_fback_desc_comp;
750 ep_int_desc = &ss_ep_int_desc;
751 }
752
753 i = 0;
754 headers[i++] = USBDHDR(&iad_desc);
755 headers[i++] = USBDHDR(&std_ac_if_desc);
756 headers[i++] = USBDHDR(&ac_hdr_desc);
757 if (EPIN_EN(opts))
758 headers[i++] = USBDHDR(&in_clk_src_desc);
759 if (EPOUT_EN(opts)) {
760 headers[i++] = USBDHDR(&out_clk_src_desc);
761 headers[i++] = USBDHDR(&usb_out_it_desc);
762
763 if (FUOUT_EN(opts))
764 headers[i++] = USBDHDR(out_feature_unit_desc);
765 }
766
767 if (EPIN_EN(opts)) {
768 headers[i++] = USBDHDR(&io_in_it_desc);
769
770 if (FUIN_EN(opts))
771 headers[i++] = USBDHDR(in_feature_unit_desc);
772
773 headers[i++] = USBDHDR(&usb_in_ot_desc);
774 }
775
776 if (EPOUT_EN(opts))
777 headers[i++] = USBDHDR(&io_out_ot_desc);
778
779 if (FUOUT_EN(opts) || FUIN_EN(opts))
780 headers[i++] = USBDHDR(ep_int_desc);
781
782 if (EPOUT_EN(opts)) {
783 headers[i++] = USBDHDR(&std_as_out_if0_desc);
784 headers[i++] = USBDHDR(&std_as_out_if1_desc);
785 headers[i++] = USBDHDR(&as_out_hdr_desc);
786 headers[i++] = USBDHDR(&as_out_fmt1_desc);
787 headers[i++] = USBDHDR(epout_desc);
788 if (epout_desc_comp)
789 headers[i++] = USBDHDR(epout_desc_comp);
790
791 headers[i++] = USBDHDR(&as_iso_out_desc);
792
793 if (EPOUT_FBACK_IN_EN(opts)) {
794 headers[i++] = USBDHDR(epin_fback_desc);
795 if (epin_fback_desc_comp)
796 headers[i++] = USBDHDR(epin_fback_desc_comp);
797 }
798 }
799
800 if (EPIN_EN(opts)) {
801 headers[i++] = USBDHDR(&std_as_in_if0_desc);
802 headers[i++] = USBDHDR(&std_as_in_if1_desc);
803 headers[i++] = USBDHDR(&as_in_hdr_desc);
804 headers[i++] = USBDHDR(&as_in_fmt1_desc);
805 headers[i++] = USBDHDR(epin_desc);
806 if (epin_desc_comp)
807 headers[i++] = USBDHDR(epin_desc_comp);
808
809 headers[i++] = USBDHDR(&as_iso_in_desc);
810 }
811 headers[i] = NULL;
812 }
813
setup_descriptor(struct f_uac2_opts * opts)814 static void setup_descriptor(struct f_uac2_opts *opts)
815 {
816 /* patch descriptors */
817 int i = 1; /* ID's start with 1 */
818
819 if (EPOUT_EN(opts))
820 usb_out_it_desc.bTerminalID = i++;
821 if (EPIN_EN(opts))
822 io_in_it_desc.bTerminalID = i++;
823 if (EPOUT_EN(opts))
824 io_out_ot_desc.bTerminalID = i++;
825 if (EPIN_EN(opts))
826 usb_in_ot_desc.bTerminalID = i++;
827 if (FUOUT_EN(opts))
828 out_feature_unit_desc->bUnitID = i++;
829 if (FUIN_EN(opts))
830 in_feature_unit_desc->bUnitID = i++;
831 if (EPOUT_EN(opts))
832 out_clk_src_desc.bClockID = i++;
833 if (EPIN_EN(opts))
834 in_clk_src_desc.bClockID = i++;
835
836 usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
837
838 if (FUIN_EN(opts)) {
839 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
840 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
841 } else {
842 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
843 }
844
845 usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
846 io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
847 io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
848
849 if (FUOUT_EN(opts)) {
850 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
851 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
852 } else {
853 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
854 }
855
856 as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
857 as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
858
859 iad_desc.bInterfaceCount = 1;
860 ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
861
862 if (EPIN_EN(opts)) {
863 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
864
865 len += sizeof(in_clk_src_desc);
866 len += sizeof(usb_in_ot_desc);
867
868 if (FUIN_EN(opts))
869 len += in_feature_unit_desc->bLength;
870
871 len += sizeof(io_in_it_desc);
872 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
873 iad_desc.bInterfaceCount++;
874 }
875 if (EPOUT_EN(opts)) {
876 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
877
878 len += sizeof(out_clk_src_desc);
879 len += sizeof(usb_out_it_desc);
880
881 if (FUOUT_EN(opts))
882 len += out_feature_unit_desc->bLength;
883
884 len += sizeof(io_out_ot_desc);
885 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
886 iad_desc.bInterfaceCount++;
887 }
888
889 setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
890 setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
891 setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
892 }
893
afunc_validate_opts(struct g_audio * agdev,struct device * dev)894 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
895 {
896 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
897
898 if (!opts->p_chmask && !opts->c_chmask) {
899 dev_err(dev, "Error: no playback and capture channels\n");
900 return -EINVAL;
901 } else if (opts->p_chmask & ~UAC2_CHANNEL_MASK) {
902 dev_err(dev, "Error: unsupported playback channels mask\n");
903 return -EINVAL;
904 } else if (opts->c_chmask & ~UAC2_CHANNEL_MASK) {
905 dev_err(dev, "Error: unsupported capture channels mask\n");
906 return -EINVAL;
907 } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
908 dev_err(dev, "Error: incorrect playback sample size\n");
909 return -EINVAL;
910 } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
911 dev_err(dev, "Error: incorrect capture sample size\n");
912 return -EINVAL;
913 } else if (!opts->p_srate) {
914 dev_err(dev, "Error: incorrect playback sampling rate\n");
915 return -EINVAL;
916 } else if (!opts->c_srate) {
917 dev_err(dev, "Error: incorrect capture sampling rate\n");
918 return -EINVAL;
919 }
920
921 if (opts->p_volume_max <= opts->p_volume_min) {
922 dev_err(dev, "Error: incorrect playback volume max/min\n");
923 return -EINVAL;
924 } else if (opts->c_volume_max <= opts->c_volume_min) {
925 dev_err(dev, "Error: incorrect capture volume max/min\n");
926 return -EINVAL;
927 } else if (opts->p_volume_res <= 0) {
928 dev_err(dev, "Error: negative/zero playback volume resolution\n");
929 return -EINVAL;
930 } else if (opts->c_volume_res <= 0) {
931 dev_err(dev, "Error: negative/zero capture volume resolution\n");
932 return -EINVAL;
933 }
934
935 if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
936 dev_err(dev, "Error: incorrect playback volume resolution\n");
937 return -EINVAL;
938 } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
939 dev_err(dev, "Error: incorrect capture volume resolution\n");
940 return -EINVAL;
941 }
942
943 return 0;
944 }
945
946 static int
afunc_bind(struct usb_configuration * cfg,struct usb_function * fn)947 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
948 {
949 struct f_uac2 *uac2 = func_to_uac2(fn);
950 struct g_audio *agdev = func_to_g_audio(fn);
951 struct usb_composite_dev *cdev = cfg->cdev;
952 struct usb_gadget *gadget = cdev->gadget;
953 struct device *dev = &gadget->dev;
954 struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
955 struct usb_string *us;
956 int ret;
957
958 ret = afunc_validate_opts(agdev, dev);
959 if (ret)
960 return ret;
961
962 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
963 if (IS_ERR(us))
964 return PTR_ERR(us);
965
966 if (FUOUT_EN(uac2_opts)) {
967 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
968 if (!out_feature_unit_desc)
969 return -ENOMEM;
970 }
971 if (FUIN_EN(uac2_opts)) {
972 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
973 if (!in_feature_unit_desc) {
974 ret = -ENOMEM;
975 goto err_free_fu;
976 }
977 }
978
979 iad_desc.iFunction = us[STR_ASSOC].id;
980 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
981 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
982 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
983 usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
984 io_in_it_desc.iTerminal = us[STR_IO_IT].id;
985 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
986 io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
987 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
988 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
989 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
990 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
991
992 if (FUOUT_EN(uac2_opts)) {
993 u8 *i_feature = (u8 *)out_feature_unit_desc +
994 out_feature_unit_desc->bLength - 1;
995 *i_feature = us[STR_FU_OUT].id;
996 }
997 if (FUIN_EN(uac2_opts)) {
998 u8 *i_feature = (u8 *)in_feature_unit_desc +
999 in_feature_unit_desc->bLength - 1;
1000 *i_feature = us[STR_FU_IN].id;
1001 }
1002
1003
1004 /* Initialize the configurable parameters */
1005 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1006 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1007 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1008 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1009 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1010 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1011 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1012 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1013 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1014 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1015 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1016 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1017 if (FUOUT_EN(uac2_opts)) {
1018 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
1019 u32 control = 0;
1020
1021 if (uac2_opts->c_mute_present)
1022 control |= CONTROL_RDWR << FU_MUTE_CTRL;
1023 if (uac2_opts->c_volume_present)
1024 control |= CONTROL_RDWR << FU_VOL_CTRL;
1025 *bma = cpu_to_le32(control);
1026 }
1027 if (FUIN_EN(uac2_opts)) {
1028 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1029 u32 control = 0;
1030
1031 if (uac2_opts->p_mute_present)
1032 control |= CONTROL_RDWR << FU_MUTE_CTRL;
1033 if (uac2_opts->p_volume_present)
1034 control |= CONTROL_RDWR << FU_VOL_CTRL;
1035 *bma = cpu_to_le32(control);
1036 }
1037
1038 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
1039 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
1040
1041 ret = usb_interface_id(cfg, fn);
1042 if (ret < 0) {
1043 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1044 goto err_free_fu;
1045 }
1046 iad_desc.bFirstInterface = ret;
1047
1048 std_ac_if_desc.bInterfaceNumber = ret;
1049 uac2->ac_intf = ret;
1050 uac2->ac_alt = 0;
1051
1052 if (EPOUT_EN(uac2_opts)) {
1053 ret = usb_interface_id(cfg, fn);
1054 if (ret < 0) {
1055 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1056 goto err_free_fu;
1057 }
1058 std_as_out_if0_desc.bInterfaceNumber = ret;
1059 std_as_out_if1_desc.bInterfaceNumber = ret;
1060 uac2->as_out_intf = ret;
1061 uac2->as_out_alt = 0;
1062
1063 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1064 fs_epout_desc.bmAttributes =
1065 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1066 hs_epout_desc.bmAttributes =
1067 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1068 ss_epout_desc.bmAttributes =
1069 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1070 std_as_out_if1_desc.bNumEndpoints++;
1071 } else {
1072 fs_epout_desc.bmAttributes =
1073 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1074 hs_epout_desc.bmAttributes =
1075 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1076 ss_epout_desc.bmAttributes =
1077 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1078 }
1079 }
1080
1081 if (EPIN_EN(uac2_opts)) {
1082 ret = usb_interface_id(cfg, fn);
1083 if (ret < 0) {
1084 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1085 goto err_free_fu;
1086 }
1087 std_as_in_if0_desc.bInterfaceNumber = ret;
1088 std_as_in_if1_desc.bInterfaceNumber = ret;
1089 uac2->as_in_intf = ret;
1090 uac2->as_in_alt = 0;
1091 }
1092
1093 if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1094 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1095 if (!uac2->int_ep) {
1096 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1097 ret = -ENODEV;
1098 goto err_free_fu;
1099 }
1100
1101 std_ac_if_desc.bNumEndpoints = 1;
1102 }
1103
1104 /* Calculate wMaxPacketSize according to audio bandwidth */
1105 ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
1106 true);
1107 if (ret < 0) {
1108 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1109 return ret;
1110 }
1111
1112 ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL,
1113 false);
1114 if (ret < 0) {
1115 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1116 return ret;
1117 }
1118
1119 ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH,
1120 true);
1121 if (ret < 0) {
1122 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1123 return ret;
1124 }
1125
1126 ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH,
1127 false);
1128 if (ret < 0) {
1129 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1130 return ret;
1131 }
1132
1133 ret = set_ep_max_packet_size(uac2_opts, &ss_epin_desc, USB_SPEED_SUPER,
1134 true);
1135 if (ret < 0) {
1136 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1137 return ret;
1138 }
1139
1140 ret = set_ep_max_packet_size(uac2_opts, &ss_epout_desc, USB_SPEED_SUPER,
1141 false);
1142 if (ret < 0) {
1143 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1144 return ret;
1145 }
1146
1147 if (EPOUT_EN(uac2_opts)) {
1148 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1149 if (!agdev->out_ep) {
1150 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1151 ret = -ENODEV;
1152 goto err_free_fu;
1153 }
1154 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1155 agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1156 &fs_epin_fback_desc);
1157 if (!agdev->in_ep_fback) {
1158 dev_err(dev, "%s:%d Error!\n",
1159 __func__, __LINE__);
1160 ret = -ENODEV;
1161 goto err_free_fu;
1162 }
1163 }
1164 }
1165
1166 if (EPIN_EN(uac2_opts)) {
1167 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1168 if (!agdev->in_ep) {
1169 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1170 ret = -ENODEV;
1171 goto err_free_fu;
1172 }
1173 }
1174
1175 agdev->in_ep_maxpsize = max_t(u16,
1176 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1177 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1178 agdev->out_ep_maxpsize = max_t(u16,
1179 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1180 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1181
1182 agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1183 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1184 agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1185 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1186
1187 ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
1188 ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
1189
1190 // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1191 hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1192 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1193 hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1194 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1195 ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1196 ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1197 ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1198 ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1199
1200 setup_descriptor(uac2_opts);
1201
1202 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
1203 ss_audio_desc);
1204 if (ret)
1205 goto err_free_fu;
1206
1207 agdev->gadget = gadget;
1208
1209 agdev->params.p_chmask = uac2_opts->p_chmask;
1210 agdev->params.p_srate = uac2_opts->p_srate;
1211 agdev->params.p_ssize = uac2_opts->p_ssize;
1212 if (FUIN_EN(uac2_opts)) {
1213 agdev->params.p_fu.id = USB_IN_FU_ID;
1214 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1215 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1216 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1217 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1218 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1219 }
1220 agdev->params.c_chmask = uac2_opts->c_chmask;
1221 agdev->params.c_srate = uac2_opts->c_srate;
1222 agdev->params.c_ssize = uac2_opts->c_ssize;
1223 if (FUOUT_EN(uac2_opts)) {
1224 agdev->params.c_fu.id = USB_OUT_FU_ID;
1225 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1226 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1227 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1228 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1229 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1230 }
1231 agdev->params.req_number = uac2_opts->req_number;
1232 agdev->params.fb_max = uac2_opts->fb_max;
1233
1234 if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1235 agdev->notify = afunc_notify;
1236
1237 ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
1238 if (ret)
1239 goto err_free_descs;
1240
1241 return 0;
1242
1243 err_free_descs:
1244 usb_free_all_descriptors(fn);
1245 agdev->gadget = NULL;
1246 err_free_fu:
1247 kfree(out_feature_unit_desc);
1248 out_feature_unit_desc = NULL;
1249 kfree(in_feature_unit_desc);
1250 in_feature_unit_desc = NULL;
1251 return ret;
1252 }
1253
1254 static void
afunc_notify_complete(struct usb_ep * _ep,struct usb_request * req)1255 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1256 {
1257 struct g_audio *agdev = req->context;
1258 struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1259
1260 atomic_dec(&uac2->int_count);
1261 kfree(req->buf);
1262 usb_ep_free_request(_ep, req);
1263 }
1264
1265 static int
afunc_notify(struct g_audio * agdev,int unit_id,int cs)1266 afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1267 {
1268 struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1269 struct usb_request *req;
1270 struct uac2_interrupt_data_msg *msg;
1271 u16 w_index, w_value;
1272 int ret;
1273
1274 if (!uac2->int_ep->enabled)
1275 return 0;
1276
1277 if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1278 atomic_dec(&uac2->int_count);
1279 return 0;
1280 }
1281
1282 req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
1283 if (req == NULL) {
1284 ret = -ENOMEM;
1285 goto err_dec_int_count;
1286 }
1287
1288 msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1289 if (msg == NULL) {
1290 ret = -ENOMEM;
1291 goto err_free_request;
1292 }
1293
1294 w_index = unit_id << 8 | uac2->ac_intf;
1295 w_value = cs << 8;
1296
1297 msg->bInfo = 0; /* Non-vendor, interface interrupt */
1298 msg->bAttribute = UAC2_CS_CUR;
1299 msg->wIndex = cpu_to_le16(w_index);
1300 msg->wValue = cpu_to_le16(w_value);
1301
1302 req->length = sizeof(*msg);
1303 req->buf = msg;
1304 req->context = agdev;
1305 req->complete = afunc_notify_complete;
1306
1307 ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
1308
1309 if (ret)
1310 goto err_free_msg;
1311
1312 return 0;
1313
1314 err_free_msg:
1315 kfree(msg);
1316 err_free_request:
1317 usb_ep_free_request(uac2->int_ep, req);
1318 err_dec_int_count:
1319 atomic_dec(&uac2->int_count);
1320
1321 return ret;
1322 }
1323
1324 static int
afunc_set_alt(struct usb_function * fn,unsigned intf,unsigned alt)1325 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1326 {
1327 struct usb_composite_dev *cdev = fn->config->cdev;
1328 struct f_uac2 *uac2 = func_to_uac2(fn);
1329 struct g_audio *agdev = func_to_g_audio(fn);
1330 struct usb_gadget *gadget = cdev->gadget;
1331 struct device *dev = &gadget->dev;
1332 int ret = 0;
1333
1334 /* No i/f has more than 2 alt settings */
1335 if (alt > 1) {
1336 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1337 return -EINVAL;
1338 }
1339
1340 if (intf == uac2->ac_intf) {
1341 /* Control I/f has only 1 AltSetting - 0 */
1342 if (alt) {
1343 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1344 return -EINVAL;
1345 }
1346
1347 /* restart interrupt endpoint */
1348 if (uac2->int_ep) {
1349 usb_ep_disable(uac2->int_ep);
1350 config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
1351 usb_ep_enable(uac2->int_ep);
1352 }
1353
1354 return 0;
1355 }
1356
1357 if (intf == uac2->as_out_intf) {
1358 uac2->as_out_alt = alt;
1359
1360 if (alt)
1361 ret = u_audio_start_capture(&uac2->g_audio);
1362 else
1363 u_audio_stop_capture(&uac2->g_audio);
1364 } else if (intf == uac2->as_in_intf) {
1365 uac2->as_in_alt = alt;
1366
1367 if (alt)
1368 ret = u_audio_start_playback(&uac2->g_audio);
1369 else
1370 u_audio_stop_playback(&uac2->g_audio);
1371 } else {
1372 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1373 return -EINVAL;
1374 }
1375
1376 return ret;
1377 }
1378
1379 static int
afunc_get_alt(struct usb_function * fn,unsigned intf)1380 afunc_get_alt(struct usb_function *fn, unsigned intf)
1381 {
1382 struct f_uac2 *uac2 = func_to_uac2(fn);
1383 struct g_audio *agdev = func_to_g_audio(fn);
1384
1385 if (intf == uac2->ac_intf)
1386 return uac2->ac_alt;
1387 else if (intf == uac2->as_out_intf)
1388 return uac2->as_out_alt;
1389 else if (intf == uac2->as_in_intf)
1390 return uac2->as_in_alt;
1391 else
1392 dev_err(&agdev->gadget->dev,
1393 "%s:%d Invalid Interface %d!\n",
1394 __func__, __LINE__, intf);
1395
1396 return -EINVAL;
1397 }
1398
1399 static void
afunc_disable(struct usb_function * fn)1400 afunc_disable(struct usb_function *fn)
1401 {
1402 struct f_uac2 *uac2 = func_to_uac2(fn);
1403
1404 uac2->as_in_alt = 0;
1405 uac2->as_out_alt = 0;
1406 u_audio_stop_capture(&uac2->g_audio);
1407 u_audio_stop_playback(&uac2->g_audio);
1408 if (uac2->int_ep)
1409 usb_ep_disable(uac2->int_ep);
1410 }
1411
1412 static int
in_rq_cur(struct usb_function * fn,const struct usb_ctrlrequest * cr)1413 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1414 {
1415 struct usb_request *req = fn->config->cdev->req;
1416 struct g_audio *agdev = func_to_g_audio(fn);
1417 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1418 u16 w_length = le16_to_cpu(cr->wLength);
1419 u16 w_index = le16_to_cpu(cr->wIndex);
1420 u16 w_value = le16_to_cpu(cr->wValue);
1421 u8 entity_id = (w_index >> 8) & 0xff;
1422 u8 control_selector = w_value >> 8;
1423 int value = -EOPNOTSUPP;
1424 int p_srate, c_srate;
1425
1426 p_srate = opts->p_srate;
1427 c_srate = opts->c_srate;
1428
1429 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1430 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1431 struct cntrl_cur_lay3 c;
1432
1433 memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1434
1435 if (entity_id == USB_IN_CLK_ID)
1436 c.dCUR = cpu_to_le32(p_srate);
1437 else if (entity_id == USB_OUT_CLK_ID)
1438 c.dCUR = cpu_to_le32(c_srate);
1439
1440 value = min_t(unsigned int, w_length, sizeof(c));
1441 memcpy(req->buf, &c, value);
1442 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1443 *(u8 *)req->buf = 1;
1444 value = min_t(unsigned int, w_length, 1);
1445 } else {
1446 dev_err(&agdev->gadget->dev,
1447 "%s:%d control_selector=%d TODO!\n",
1448 __func__, __LINE__, control_selector);
1449 }
1450 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1451 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1452 unsigned int is_playback = 0;
1453
1454 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1455 is_playback = 1;
1456
1457 if (control_selector == UAC_FU_MUTE) {
1458 unsigned int mute;
1459
1460 u_audio_get_mute(agdev, is_playback, &mute);
1461
1462 *(u8 *)req->buf = mute;
1463 value = min_t(unsigned int, w_length, 1);
1464 } else if (control_selector == UAC_FU_VOLUME) {
1465 struct cntrl_cur_lay2 c;
1466 s16 volume;
1467
1468 memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1469
1470 u_audio_get_volume(agdev, is_playback, &volume);
1471 c.wCUR = cpu_to_le16(volume);
1472
1473 value = min_t(unsigned int, w_length, sizeof(c));
1474 memcpy(req->buf, &c, value);
1475 } else {
1476 dev_err(&agdev->gadget->dev,
1477 "%s:%d control_selector=%d TODO!\n",
1478 __func__, __LINE__, control_selector);
1479 }
1480 } else {
1481 dev_err(&agdev->gadget->dev,
1482 "%s:%d entity_id=%d control_selector=%d TODO!\n",
1483 __func__, __LINE__, entity_id, control_selector);
1484 }
1485
1486 return value;
1487 }
1488
1489 static int
in_rq_range(struct usb_function * fn,const struct usb_ctrlrequest * cr)1490 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1491 {
1492 struct usb_request *req = fn->config->cdev->req;
1493 struct g_audio *agdev = func_to_g_audio(fn);
1494 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1495 u16 w_length = le16_to_cpu(cr->wLength);
1496 u16 w_index = le16_to_cpu(cr->wIndex);
1497 u16 w_value = le16_to_cpu(cr->wValue);
1498 u8 entity_id = (w_index >> 8) & 0xff;
1499 u8 control_selector = w_value >> 8;
1500 int value = -EOPNOTSUPP;
1501 int p_srate, c_srate;
1502
1503 p_srate = opts->p_srate;
1504 c_srate = opts->c_srate;
1505
1506 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1507 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1508 struct cntrl_range_lay3 r;
1509
1510 if (entity_id == USB_IN_CLK_ID)
1511 r.dMIN = cpu_to_le32(p_srate);
1512 else if (entity_id == USB_OUT_CLK_ID)
1513 r.dMIN = cpu_to_le32(c_srate);
1514 else
1515 return -EOPNOTSUPP;
1516
1517 r.dMAX = r.dMIN;
1518 r.dRES = 0;
1519 r.wNumSubRanges = cpu_to_le16(1);
1520
1521 value = min_t(unsigned int, w_length, sizeof(r));
1522 memcpy(req->buf, &r, value);
1523 } else {
1524 dev_err(&agdev->gadget->dev,
1525 "%s:%d control_selector=%d TODO!\n",
1526 __func__, __LINE__, control_selector);
1527 }
1528 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1529 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1530 unsigned int is_playback = 0;
1531
1532 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1533 is_playback = 1;
1534
1535 if (control_selector == UAC_FU_VOLUME) {
1536 struct cntrl_range_lay2 r;
1537 s16 max_db, min_db, res_db;
1538
1539 if (is_playback) {
1540 max_db = opts->p_volume_max;
1541 min_db = opts->p_volume_min;
1542 res_db = opts->p_volume_res;
1543 } else {
1544 max_db = opts->c_volume_max;
1545 min_db = opts->c_volume_min;
1546 res_db = opts->c_volume_res;
1547 }
1548
1549 r.wMAX = cpu_to_le16(max_db);
1550 r.wMIN = cpu_to_le16(min_db);
1551 r.wRES = cpu_to_le16(res_db);
1552 r.wNumSubRanges = cpu_to_le16(1);
1553
1554 value = min_t(unsigned int, w_length, sizeof(r));
1555 memcpy(req->buf, &r, value);
1556 } else {
1557 dev_err(&agdev->gadget->dev,
1558 "%s:%d control_selector=%d TODO!\n",
1559 __func__, __LINE__, control_selector);
1560 }
1561 } else {
1562 dev_err(&agdev->gadget->dev,
1563 "%s:%d entity_id=%d control_selector=%d TODO!\n",
1564 __func__, __LINE__, entity_id, control_selector);
1565 }
1566
1567 return value;
1568 }
1569
1570 static int
ac_rq_in(struct usb_function * fn,const struct usb_ctrlrequest * cr)1571 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1572 {
1573 if (cr->bRequest == UAC2_CS_CUR)
1574 return in_rq_cur(fn, cr);
1575 else if (cr->bRequest == UAC2_CS_RANGE)
1576 return in_rq_range(fn, cr);
1577 else
1578 return -EOPNOTSUPP;
1579 }
1580
1581 static void
out_rq_cur_complete(struct usb_ep * ep,struct usb_request * req)1582 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1583 {
1584 struct g_audio *agdev = req->context;
1585 struct usb_composite_dev *cdev = agdev->func.config->cdev;
1586 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1587 struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1588 struct usb_ctrlrequest *cr = &uac2->setup_cr;
1589 u16 w_index = le16_to_cpu(cr->wIndex);
1590 u16 w_value = le16_to_cpu(cr->wValue);
1591 u8 entity_id = (w_index >> 8) & 0xff;
1592 u8 control_selector = w_value >> 8;
1593
1594 if (req->status != 0) {
1595 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1596 return;
1597 }
1598
1599 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1600 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1601 unsigned int is_playback = 0;
1602
1603 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1604 is_playback = 1;
1605
1606 if (control_selector == UAC_FU_MUTE) {
1607 u8 mute = *(u8 *)req->buf;
1608
1609 u_audio_set_mute(agdev, is_playback, mute);
1610
1611 return;
1612 } else if (control_selector == UAC_FU_VOLUME) {
1613 struct cntrl_cur_lay2 *c = req->buf;
1614 s16 volume;
1615
1616 volume = le16_to_cpu(c->wCUR);
1617 u_audio_set_volume(agdev, is_playback, volume);
1618
1619 return;
1620 } else {
1621 dev_err(&agdev->gadget->dev,
1622 "%s:%d control_selector=%d TODO!\n",
1623 __func__, __LINE__, control_selector);
1624 usb_ep_set_halt(ep);
1625 }
1626 }
1627 }
1628
1629 static int
out_rq_cur(struct usb_function * fn,const struct usb_ctrlrequest * cr)1630 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1631 {
1632 struct usb_request *req = fn->config->cdev->req;
1633 struct g_audio *agdev = func_to_g_audio(fn);
1634 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1635 struct f_uac2 *uac2 = func_to_uac2(fn);
1636 u16 w_length = le16_to_cpu(cr->wLength);
1637 u16 w_index = le16_to_cpu(cr->wIndex);
1638 u16 w_value = le16_to_cpu(cr->wValue);
1639 u8 entity_id = (w_index >> 8) & 0xff;
1640 u8 control_selector = w_value >> 8;
1641
1642 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1643 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1644 return w_length;
1645 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1646 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1647 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1648 req->context = agdev;
1649 req->complete = out_rq_cur_complete;
1650
1651 return w_length;
1652 } else {
1653 dev_err(&agdev->gadget->dev,
1654 "%s:%d entity_id=%d control_selector=%d TODO!\n",
1655 __func__, __LINE__, entity_id, control_selector);
1656 }
1657 return -EOPNOTSUPP;
1658 }
1659
1660 static int
setup_rq_inf(struct usb_function * fn,const struct usb_ctrlrequest * cr)1661 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1662 {
1663 struct f_uac2 *uac2 = func_to_uac2(fn);
1664 struct g_audio *agdev = func_to_g_audio(fn);
1665 u16 w_index = le16_to_cpu(cr->wIndex);
1666 u8 intf = w_index & 0xff;
1667
1668 if (intf != uac2->ac_intf) {
1669 dev_err(&agdev->gadget->dev,
1670 "%s:%d Error!\n", __func__, __LINE__);
1671 return -EOPNOTSUPP;
1672 }
1673
1674 if (cr->bRequestType & USB_DIR_IN)
1675 return ac_rq_in(fn, cr);
1676 else if (cr->bRequest == UAC2_CS_CUR)
1677 return out_rq_cur(fn, cr);
1678
1679 return -EOPNOTSUPP;
1680 }
1681
1682 static int
afunc_setup(struct usb_function * fn,const struct usb_ctrlrequest * cr)1683 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1684 {
1685 struct usb_composite_dev *cdev = fn->config->cdev;
1686 struct g_audio *agdev = func_to_g_audio(fn);
1687 struct usb_request *req = cdev->req;
1688 u16 w_length = le16_to_cpu(cr->wLength);
1689 int value = -EOPNOTSUPP;
1690
1691 /* Only Class specific requests are supposed to reach here */
1692 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1693 return -EOPNOTSUPP;
1694
1695 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1696 value = setup_rq_inf(fn, cr);
1697 else
1698 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1699 __func__, __LINE__);
1700
1701 if (value >= 0) {
1702 req->length = value;
1703 req->zero = value < w_length;
1704 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1705 if (value < 0) {
1706 dev_err(&agdev->gadget->dev,
1707 "%s:%d Error!\n", __func__, __LINE__);
1708 req->status = 0;
1709 }
1710 }
1711
1712 return value;
1713 }
1714
to_f_uac2_opts(struct config_item * item)1715 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1716 {
1717 return container_of(to_config_group(item), struct f_uac2_opts,
1718 func_inst.group);
1719 }
1720
f_uac2_attr_release(struct config_item * item)1721 static void f_uac2_attr_release(struct config_item *item)
1722 {
1723 struct f_uac2_opts *opts = to_f_uac2_opts(item);
1724
1725 usb_put_function_instance(&opts->func_inst);
1726 }
1727
1728 static struct configfs_item_operations f_uac2_item_ops = {
1729 .release = f_uac2_attr_release,
1730 };
1731
1732 #define uac2_kstrtou32 kstrtou32
1733 #define uac2_kstrtos16 kstrtos16
1734 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1735
1736 static const char *u32_fmt = "%u\n";
1737 static const char *s16_fmt = "%hd\n";
1738 static const char *bool_fmt = "%u\n";
1739
1740 #define UAC2_ATTRIBUTE(type, name) \
1741 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1742 char *page) \
1743 { \
1744 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1745 int result; \
1746 \
1747 mutex_lock(&opts->lock); \
1748 result = sprintf(page, type##_fmt, opts->name); \
1749 mutex_unlock(&opts->lock); \
1750 \
1751 return result; \
1752 } \
1753 \
1754 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
1755 const char *page, size_t len) \
1756 { \
1757 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1758 int ret; \
1759 type num; \
1760 \
1761 mutex_lock(&opts->lock); \
1762 if (opts->refcnt) { \
1763 ret = -EBUSY; \
1764 goto end; \
1765 } \
1766 \
1767 ret = uac2_kstrto##type(page, 0, &num); \
1768 if (ret) \
1769 goto end; \
1770 \
1771 opts->name = num; \
1772 ret = len; \
1773 \
1774 end: \
1775 mutex_unlock(&opts->lock); \
1776 return ret; \
1777 } \
1778 \
1779 CONFIGFS_ATTR(f_uac2_opts_, name)
1780
1781 #define UAC2_ATTRIBUTE_SYNC(name) \
1782 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1783 char *page) \
1784 { \
1785 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1786 int result; \
1787 char *str; \
1788 \
1789 mutex_lock(&opts->lock); \
1790 switch (opts->name) { \
1791 case USB_ENDPOINT_SYNC_ASYNC: \
1792 str = "async"; \
1793 break; \
1794 case USB_ENDPOINT_SYNC_ADAPTIVE: \
1795 str = "adaptive"; \
1796 break; \
1797 default: \
1798 str = "unknown"; \
1799 break; \
1800 } \
1801 result = sprintf(page, "%s\n", str); \
1802 mutex_unlock(&opts->lock); \
1803 \
1804 return result; \
1805 } \
1806 \
1807 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
1808 const char *page, size_t len) \
1809 { \
1810 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1811 int ret = 0; \
1812 \
1813 mutex_lock(&opts->lock); \
1814 if (opts->refcnt) { \
1815 ret = -EBUSY; \
1816 goto end; \
1817 } \
1818 \
1819 if (!strncmp(page, "async", 5)) \
1820 opts->name = USB_ENDPOINT_SYNC_ASYNC; \
1821 else if (!strncmp(page, "adaptive", 8)) \
1822 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE; \
1823 else { \
1824 ret = -EINVAL; \
1825 goto end; \
1826 } \
1827 \
1828 ret = len; \
1829 \
1830 end: \
1831 mutex_unlock(&opts->lock); \
1832 return ret; \
1833 } \
1834 \
1835 CONFIGFS_ATTR(f_uac2_opts_, name)
1836
1837 UAC2_ATTRIBUTE(u32, p_chmask);
1838 UAC2_ATTRIBUTE(u32, p_srate);
1839 UAC2_ATTRIBUTE(u32, p_ssize);
1840 UAC2_ATTRIBUTE(u32, c_chmask);
1841 UAC2_ATTRIBUTE(u32, c_srate);
1842 UAC2_ATTRIBUTE_SYNC(c_sync);
1843 UAC2_ATTRIBUTE(u32, c_ssize);
1844 UAC2_ATTRIBUTE(u32, req_number);
1845
1846 UAC2_ATTRIBUTE(bool, p_mute_present);
1847 UAC2_ATTRIBUTE(bool, p_volume_present);
1848 UAC2_ATTRIBUTE(s16, p_volume_min);
1849 UAC2_ATTRIBUTE(s16, p_volume_max);
1850 UAC2_ATTRIBUTE(s16, p_volume_res);
1851
1852 UAC2_ATTRIBUTE(bool, c_mute_present);
1853 UAC2_ATTRIBUTE(bool, c_volume_present);
1854 UAC2_ATTRIBUTE(s16, c_volume_min);
1855 UAC2_ATTRIBUTE(s16, c_volume_max);
1856 UAC2_ATTRIBUTE(s16, c_volume_res);
1857 UAC2_ATTRIBUTE(u32, fb_max);
1858
1859 static struct configfs_attribute *f_uac2_attrs[] = {
1860 &f_uac2_opts_attr_p_chmask,
1861 &f_uac2_opts_attr_p_srate,
1862 &f_uac2_opts_attr_p_ssize,
1863 &f_uac2_opts_attr_c_chmask,
1864 &f_uac2_opts_attr_c_srate,
1865 &f_uac2_opts_attr_c_ssize,
1866 &f_uac2_opts_attr_c_sync,
1867 &f_uac2_opts_attr_req_number,
1868 &f_uac2_opts_attr_fb_max,
1869
1870 &f_uac2_opts_attr_p_mute_present,
1871 &f_uac2_opts_attr_p_volume_present,
1872 &f_uac2_opts_attr_p_volume_min,
1873 &f_uac2_opts_attr_p_volume_max,
1874 &f_uac2_opts_attr_p_volume_res,
1875
1876 &f_uac2_opts_attr_c_mute_present,
1877 &f_uac2_opts_attr_c_volume_present,
1878 &f_uac2_opts_attr_c_volume_min,
1879 &f_uac2_opts_attr_c_volume_max,
1880 &f_uac2_opts_attr_c_volume_res,
1881
1882 NULL,
1883 };
1884
1885 static const struct config_item_type f_uac2_func_type = {
1886 .ct_item_ops = &f_uac2_item_ops,
1887 .ct_attrs = f_uac2_attrs,
1888 .ct_owner = THIS_MODULE,
1889 };
1890
afunc_free_inst(struct usb_function_instance * f)1891 static void afunc_free_inst(struct usb_function_instance *f)
1892 {
1893 struct f_uac2_opts *opts;
1894
1895 opts = container_of(f, struct f_uac2_opts, func_inst);
1896 kfree(opts);
1897 }
1898
afunc_alloc_inst(void)1899 static struct usb_function_instance *afunc_alloc_inst(void)
1900 {
1901 struct f_uac2_opts *opts;
1902
1903 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1904 if (!opts)
1905 return ERR_PTR(-ENOMEM);
1906
1907 mutex_init(&opts->lock);
1908 opts->func_inst.free_func_inst = afunc_free_inst;
1909
1910 config_group_init_type_name(&opts->func_inst.group, "",
1911 &f_uac2_func_type);
1912
1913 opts->p_chmask = UAC2_DEF_PCHMASK;
1914 opts->p_srate = UAC2_DEF_PSRATE;
1915 opts->p_ssize = UAC2_DEF_PSSIZE;
1916 opts->c_chmask = UAC2_DEF_CCHMASK;
1917 opts->c_srate = UAC2_DEF_CSRATE;
1918 opts->c_ssize = UAC2_DEF_CSSIZE;
1919 opts->c_sync = UAC2_DEF_CSYNC;
1920
1921 opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
1922 opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
1923 opts->p_volume_min = UAC2_DEF_MIN_DB;
1924 opts->p_volume_max = UAC2_DEF_MAX_DB;
1925 opts->p_volume_res = UAC2_DEF_RES_DB;
1926
1927 opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
1928 opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
1929 opts->c_volume_min = UAC2_DEF_MIN_DB;
1930 opts->c_volume_max = UAC2_DEF_MAX_DB;
1931 opts->c_volume_res = UAC2_DEF_RES_DB;
1932
1933 opts->req_number = UAC2_DEF_REQ_NUM;
1934 opts->fb_max = UAC2_DEF_FB_MAX;
1935 return &opts->func_inst;
1936 }
1937
afunc_free(struct usb_function * f)1938 static void afunc_free(struct usb_function *f)
1939 {
1940 struct g_audio *agdev;
1941 struct f_uac2_opts *opts;
1942
1943 agdev = func_to_g_audio(f);
1944 opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1945 kfree(agdev);
1946 mutex_lock(&opts->lock);
1947 --opts->refcnt;
1948 mutex_unlock(&opts->lock);
1949 }
1950
afunc_unbind(struct usb_configuration * c,struct usb_function * f)1951 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1952 {
1953 struct g_audio *agdev = func_to_g_audio(f);
1954
1955 g_audio_cleanup(agdev);
1956 usb_free_all_descriptors(f);
1957
1958 agdev->gadget = NULL;
1959
1960 kfree(out_feature_unit_desc);
1961 out_feature_unit_desc = NULL;
1962 kfree(in_feature_unit_desc);
1963 in_feature_unit_desc = NULL;
1964 }
1965
afunc_alloc(struct usb_function_instance * fi)1966 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1967 {
1968 struct f_uac2 *uac2;
1969 struct f_uac2_opts *opts;
1970
1971 uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
1972 if (uac2 == NULL)
1973 return ERR_PTR(-ENOMEM);
1974
1975 opts = container_of(fi, struct f_uac2_opts, func_inst);
1976 mutex_lock(&opts->lock);
1977 ++opts->refcnt;
1978 mutex_unlock(&opts->lock);
1979
1980 uac2->g_audio.func.name = "uac2_func";
1981 uac2->g_audio.func.bind = afunc_bind;
1982 uac2->g_audio.func.unbind = afunc_unbind;
1983 uac2->g_audio.func.set_alt = afunc_set_alt;
1984 uac2->g_audio.func.get_alt = afunc_get_alt;
1985 uac2->g_audio.func.disable = afunc_disable;
1986 uac2->g_audio.func.setup = afunc_setup;
1987 uac2->g_audio.func.free_func = afunc_free;
1988
1989 return &uac2->g_audio.func;
1990 }
1991
1992 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1993 MODULE_LICENSE("GPL");
1994 MODULE_AUTHOR("Yadwinder Singh");
1995 MODULE_AUTHOR("Jaswinder Singh");
1996 MODULE_AUTHOR("Ruslan Bilovol");
1997
