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