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[mirror_ubuntu-artful-kernel.git] / drivers / usb / gadget / function / f_uac2.c
1 /*
2 * f_uac2.c -- USB Audio Class 2.0 Function
3 *
4 * Copyright (C) 2011
5 * Yadwinder Singh (yadi.brar01@gmail.com)
6 * Jaswinder Singh (jaswinder.singh@linaro.org)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/usb/audio.h>
15 #include <linux/usb/audio-v2.h>
16 #include <linux/module.h>
17
18 #include "u_audio.h"
19 #include "u_uac2.h"
20
21 /*
22 * The driver implements a simple UAC_2 topology.
23 * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
24 * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
25 * Capture and Playback sampling rates are independently
26 * controlled by two clock sources :
27 * CLK_5 := c_srate, and CLK_6 := p_srate
28 */
29 #define USB_OUT_IT_ID 1
30 #define IO_IN_IT_ID 2
31 #define IO_OUT_OT_ID 3
32 #define USB_IN_OT_ID 4
33 #define USB_OUT_CLK_ID 5
34 #define USB_IN_CLK_ID 6
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
43 #define COPY_CTRL 0
44 #define CONN_CTRL 2
45 #define OVRLD_CTRL 4
46 #define CLSTR_CTRL 6
47 #define UNFLW_CTRL 8
48 #define OVFLW_CTRL 10
49
50 struct f_uac2 {
51 struct g_audio g_audio;
52 u8 ac_intf, as_in_intf, as_out_intf;
53 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
54 };
55
56 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
57 {
58 return container_of(f, struct f_uac2, g_audio.func);
59 }
60
61 static inline
62 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
63 {
64 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
65 }
66
67 /* --------- USB Function Interface ------------- */
68
69 enum {
70 STR_ASSOC,
71 STR_IF_CTRL,
72 STR_CLKSRC_IN,
73 STR_CLKSRC_OUT,
74 STR_USB_IT,
75 STR_IO_IT,
76 STR_USB_OT,
77 STR_IO_OT,
78 STR_AS_OUT_ALT0,
79 STR_AS_OUT_ALT1,
80 STR_AS_IN_ALT0,
81 STR_AS_IN_ALT1,
82 };
83
84 static char clksrc_in[8];
85 static char clksrc_out[8];
86
87 static struct usb_string strings_fn[] = {
88 [STR_ASSOC].s = "Source/Sink",
89 [STR_IF_CTRL].s = "Topology Control",
90 [STR_CLKSRC_IN].s = clksrc_in,
91 [STR_CLKSRC_OUT].s = clksrc_out,
92 [STR_USB_IT].s = "USBH Out",
93 [STR_IO_IT].s = "USBD Out",
94 [STR_USB_OT].s = "USBH In",
95 [STR_IO_OT].s = "USBD In",
96 [STR_AS_OUT_ALT0].s = "Playback Inactive",
97 [STR_AS_OUT_ALT1].s = "Playback Active",
98 [STR_AS_IN_ALT0].s = "Capture Inactive",
99 [STR_AS_IN_ALT1].s = "Capture Active",
100 { },
101 };
102
103 static struct usb_gadget_strings str_fn = {
104 .language = 0x0409, /* en-us */
105 .strings = strings_fn,
106 };
107
108 static struct usb_gadget_strings *fn_strings[] = {
109 &str_fn,
110 NULL,
111 };
112
113 static struct usb_interface_assoc_descriptor iad_desc = {
114 .bLength = sizeof iad_desc,
115 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
116
117 .bFirstInterface = 0,
118 .bInterfaceCount = 3,
119 .bFunctionClass = USB_CLASS_AUDIO,
120 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
121 .bFunctionProtocol = UAC_VERSION_2,
122 };
123
124 /* Audio Control Interface */
125 static struct usb_interface_descriptor std_ac_if_desc = {
126 .bLength = sizeof std_ac_if_desc,
127 .bDescriptorType = USB_DT_INTERFACE,
128
129 .bAlternateSetting = 0,
130 .bNumEndpoints = 0,
131 .bInterfaceClass = USB_CLASS_AUDIO,
132 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
133 .bInterfaceProtocol = UAC_VERSION_2,
134 };
135
136 /* Clock source for IN traffic */
137 static struct uac_clock_source_descriptor in_clk_src_desc = {
138 .bLength = sizeof in_clk_src_desc,
139 .bDescriptorType = USB_DT_CS_INTERFACE,
140
141 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
142 .bClockID = USB_IN_CLK_ID,
143 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
144 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
145 .bAssocTerminal = 0,
146 };
147
148 /* Clock source for OUT traffic */
149 static struct uac_clock_source_descriptor out_clk_src_desc = {
150 .bLength = sizeof out_clk_src_desc,
151 .bDescriptorType = USB_DT_CS_INTERFACE,
152
153 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
154 .bClockID = USB_OUT_CLK_ID,
155 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
156 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
157 .bAssocTerminal = 0,
158 };
159
160 /* Input Terminal for USB_OUT */
161 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
162 .bLength = sizeof usb_out_it_desc,
163 .bDescriptorType = USB_DT_CS_INTERFACE,
164
165 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
166 .bTerminalID = USB_OUT_IT_ID,
167 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
168 .bAssocTerminal = 0,
169 .bCSourceID = USB_OUT_CLK_ID,
170 .iChannelNames = 0,
171 .bmControls = (CONTROL_RDWR << COPY_CTRL),
172 };
173
174 /* Input Terminal for I/O-In */
175 static struct uac2_input_terminal_descriptor io_in_it_desc = {
176 .bLength = sizeof io_in_it_desc,
177 .bDescriptorType = USB_DT_CS_INTERFACE,
178
179 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
180 .bTerminalID = IO_IN_IT_ID,
181 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
182 .bAssocTerminal = 0,
183 .bCSourceID = USB_IN_CLK_ID,
184 .iChannelNames = 0,
185 .bmControls = (CONTROL_RDWR << COPY_CTRL),
186 };
187
188 /* Ouput Terminal for USB_IN */
189 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
190 .bLength = sizeof usb_in_ot_desc,
191 .bDescriptorType = USB_DT_CS_INTERFACE,
192
193 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
194 .bTerminalID = USB_IN_OT_ID,
195 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
196 .bAssocTerminal = 0,
197 .bSourceID = IO_IN_IT_ID,
198 .bCSourceID = USB_IN_CLK_ID,
199 .bmControls = (CONTROL_RDWR << COPY_CTRL),
200 };
201
202 /* Ouput Terminal for I/O-Out */
203 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
204 .bLength = sizeof io_out_ot_desc,
205 .bDescriptorType = USB_DT_CS_INTERFACE,
206
207 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
208 .bTerminalID = IO_OUT_OT_ID,
209 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
210 .bAssocTerminal = 0,
211 .bSourceID = USB_OUT_IT_ID,
212 .bCSourceID = USB_OUT_CLK_ID,
213 .bmControls = (CONTROL_RDWR << COPY_CTRL),
214 };
215
216 static struct uac2_ac_header_descriptor ac_hdr_desc = {
217 .bLength = sizeof ac_hdr_desc,
218 .bDescriptorType = USB_DT_CS_INTERFACE,
219
220 .bDescriptorSubtype = UAC_MS_HEADER,
221 .bcdADC = cpu_to_le16(0x200),
222 .bCategory = UAC2_FUNCTION_IO_BOX,
223 .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
224 + sizeof usb_out_it_desc + sizeof io_in_it_desc
225 + sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
226 .bmControls = 0,
227 };
228
229 /* Audio Streaming OUT Interface - Alt0 */
230 static struct usb_interface_descriptor std_as_out_if0_desc = {
231 .bLength = sizeof std_as_out_if0_desc,
232 .bDescriptorType = USB_DT_INTERFACE,
233
234 .bAlternateSetting = 0,
235 .bNumEndpoints = 0,
236 .bInterfaceClass = USB_CLASS_AUDIO,
237 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
238 .bInterfaceProtocol = UAC_VERSION_2,
239 };
240
241 /* Audio Streaming OUT Interface - Alt1 */
242 static struct usb_interface_descriptor std_as_out_if1_desc = {
243 .bLength = sizeof std_as_out_if1_desc,
244 .bDescriptorType = USB_DT_INTERFACE,
245
246 .bAlternateSetting = 1,
247 .bNumEndpoints = 1,
248 .bInterfaceClass = USB_CLASS_AUDIO,
249 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
250 .bInterfaceProtocol = UAC_VERSION_2,
251 };
252
253 /* Audio Stream OUT Intface Desc */
254 static struct uac2_as_header_descriptor as_out_hdr_desc = {
255 .bLength = sizeof as_out_hdr_desc,
256 .bDescriptorType = USB_DT_CS_INTERFACE,
257
258 .bDescriptorSubtype = UAC_AS_GENERAL,
259 .bTerminalLink = USB_OUT_IT_ID,
260 .bmControls = 0,
261 .bFormatType = UAC_FORMAT_TYPE_I,
262 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
263 .iChannelNames = 0,
264 };
265
266 /* Audio USB_OUT Format */
267 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
268 .bLength = sizeof as_out_fmt1_desc,
269 .bDescriptorType = USB_DT_CS_INTERFACE,
270 .bDescriptorSubtype = UAC_FORMAT_TYPE,
271 .bFormatType = UAC_FORMAT_TYPE_I,
272 };
273
274 /* STD AS ISO OUT Endpoint */
275 static struct usb_endpoint_descriptor fs_epout_desc = {
276 .bLength = USB_DT_ENDPOINT_SIZE,
277 .bDescriptorType = USB_DT_ENDPOINT,
278
279 .bEndpointAddress = USB_DIR_OUT,
280 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
281 .wMaxPacketSize = cpu_to_le16(1023),
282 .bInterval = 1,
283 };
284
285 static struct usb_endpoint_descriptor hs_epout_desc = {
286 .bLength = USB_DT_ENDPOINT_SIZE,
287 .bDescriptorType = USB_DT_ENDPOINT,
288
289 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
290 .wMaxPacketSize = cpu_to_le16(1024),
291 .bInterval = 4,
292 };
293
294 /* CS AS ISO OUT Endpoint */
295 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
296 .bLength = sizeof as_iso_out_desc,
297 .bDescriptorType = USB_DT_CS_ENDPOINT,
298
299 .bDescriptorSubtype = UAC_EP_GENERAL,
300 .bmAttributes = 0,
301 .bmControls = 0,
302 .bLockDelayUnits = 0,
303 .wLockDelay = 0,
304 };
305
306 /* Audio Streaming IN Interface - Alt0 */
307 static struct usb_interface_descriptor std_as_in_if0_desc = {
308 .bLength = sizeof std_as_in_if0_desc,
309 .bDescriptorType = USB_DT_INTERFACE,
310
311 .bAlternateSetting = 0,
312 .bNumEndpoints = 0,
313 .bInterfaceClass = USB_CLASS_AUDIO,
314 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
315 .bInterfaceProtocol = UAC_VERSION_2,
316 };
317
318 /* Audio Streaming IN Interface - Alt1 */
319 static struct usb_interface_descriptor std_as_in_if1_desc = {
320 .bLength = sizeof std_as_in_if1_desc,
321 .bDescriptorType = USB_DT_INTERFACE,
322
323 .bAlternateSetting = 1,
324 .bNumEndpoints = 1,
325 .bInterfaceClass = USB_CLASS_AUDIO,
326 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
327 .bInterfaceProtocol = UAC_VERSION_2,
328 };
329
330 /* Audio Stream IN Intface Desc */
331 static struct uac2_as_header_descriptor as_in_hdr_desc = {
332 .bLength = sizeof as_in_hdr_desc,
333 .bDescriptorType = USB_DT_CS_INTERFACE,
334
335 .bDescriptorSubtype = UAC_AS_GENERAL,
336 .bTerminalLink = USB_IN_OT_ID,
337 .bmControls = 0,
338 .bFormatType = UAC_FORMAT_TYPE_I,
339 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
340 .iChannelNames = 0,
341 };
342
343 /* Audio USB_IN Format */
344 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
345 .bLength = sizeof as_in_fmt1_desc,
346 .bDescriptorType = USB_DT_CS_INTERFACE,
347 .bDescriptorSubtype = UAC_FORMAT_TYPE,
348 .bFormatType = UAC_FORMAT_TYPE_I,
349 };
350
351 /* STD AS ISO IN Endpoint */
352 static struct usb_endpoint_descriptor fs_epin_desc = {
353 .bLength = USB_DT_ENDPOINT_SIZE,
354 .bDescriptorType = USB_DT_ENDPOINT,
355
356 .bEndpointAddress = USB_DIR_IN,
357 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
358 .wMaxPacketSize = cpu_to_le16(1023),
359 .bInterval = 1,
360 };
361
362 static struct usb_endpoint_descriptor hs_epin_desc = {
363 .bLength = USB_DT_ENDPOINT_SIZE,
364 .bDescriptorType = USB_DT_ENDPOINT,
365
366 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
367 .wMaxPacketSize = cpu_to_le16(1024),
368 .bInterval = 4,
369 };
370
371 /* CS AS ISO IN Endpoint */
372 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
373 .bLength = sizeof as_iso_in_desc,
374 .bDescriptorType = USB_DT_CS_ENDPOINT,
375
376 .bDescriptorSubtype = UAC_EP_GENERAL,
377 .bmAttributes = 0,
378 .bmControls = 0,
379 .bLockDelayUnits = 0,
380 .wLockDelay = 0,
381 };
382
383 static struct usb_descriptor_header *fs_audio_desc[] = {
384 (struct usb_descriptor_header *)&iad_desc,
385 (struct usb_descriptor_header *)&std_ac_if_desc,
386
387 (struct usb_descriptor_header *)&ac_hdr_desc,
388 (struct usb_descriptor_header *)&in_clk_src_desc,
389 (struct usb_descriptor_header *)&out_clk_src_desc,
390 (struct usb_descriptor_header *)&usb_out_it_desc,
391 (struct usb_descriptor_header *)&io_in_it_desc,
392 (struct usb_descriptor_header *)&usb_in_ot_desc,
393 (struct usb_descriptor_header *)&io_out_ot_desc,
394
395 (struct usb_descriptor_header *)&std_as_out_if0_desc,
396 (struct usb_descriptor_header *)&std_as_out_if1_desc,
397
398 (struct usb_descriptor_header *)&as_out_hdr_desc,
399 (struct usb_descriptor_header *)&as_out_fmt1_desc,
400 (struct usb_descriptor_header *)&fs_epout_desc,
401 (struct usb_descriptor_header *)&as_iso_out_desc,
402
403 (struct usb_descriptor_header *)&std_as_in_if0_desc,
404 (struct usb_descriptor_header *)&std_as_in_if1_desc,
405
406 (struct usb_descriptor_header *)&as_in_hdr_desc,
407 (struct usb_descriptor_header *)&as_in_fmt1_desc,
408 (struct usb_descriptor_header *)&fs_epin_desc,
409 (struct usb_descriptor_header *)&as_iso_in_desc,
410 NULL,
411 };
412
413 static struct usb_descriptor_header *hs_audio_desc[] = {
414 (struct usb_descriptor_header *)&iad_desc,
415 (struct usb_descriptor_header *)&std_ac_if_desc,
416
417 (struct usb_descriptor_header *)&ac_hdr_desc,
418 (struct usb_descriptor_header *)&in_clk_src_desc,
419 (struct usb_descriptor_header *)&out_clk_src_desc,
420 (struct usb_descriptor_header *)&usb_out_it_desc,
421 (struct usb_descriptor_header *)&io_in_it_desc,
422 (struct usb_descriptor_header *)&usb_in_ot_desc,
423 (struct usb_descriptor_header *)&io_out_ot_desc,
424
425 (struct usb_descriptor_header *)&std_as_out_if0_desc,
426 (struct usb_descriptor_header *)&std_as_out_if1_desc,
427
428 (struct usb_descriptor_header *)&as_out_hdr_desc,
429 (struct usb_descriptor_header *)&as_out_fmt1_desc,
430 (struct usb_descriptor_header *)&hs_epout_desc,
431 (struct usb_descriptor_header *)&as_iso_out_desc,
432
433 (struct usb_descriptor_header *)&std_as_in_if0_desc,
434 (struct usb_descriptor_header *)&std_as_in_if1_desc,
435
436 (struct usb_descriptor_header *)&as_in_hdr_desc,
437 (struct usb_descriptor_header *)&as_in_fmt1_desc,
438 (struct usb_descriptor_header *)&hs_epin_desc,
439 (struct usb_descriptor_header *)&as_iso_in_desc,
440 NULL,
441 };
442
443 struct cntrl_cur_lay3 {
444 __u32 dCUR;
445 };
446
447 struct cntrl_range_lay3 {
448 __u16 wNumSubRanges;
449 __u32 dMIN;
450 __u32 dMAX;
451 __u32 dRES;
452 } __packed;
453
454 static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
455 struct usb_endpoint_descriptor *ep_desc,
456 unsigned int factor, bool is_playback)
457 {
458 int chmask, srate, ssize;
459 u16 max_packet_size;
460
461 if (is_playback) {
462 chmask = uac2_opts->p_chmask;
463 srate = uac2_opts->p_srate;
464 ssize = uac2_opts->p_ssize;
465 } else {
466 chmask = uac2_opts->c_chmask;
467 srate = uac2_opts->c_srate;
468 ssize = uac2_opts->c_ssize;
469 }
470
471 max_packet_size = num_channels(chmask) * ssize *
472 DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)));
473 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size,
474 le16_to_cpu(ep_desc->wMaxPacketSize)));
475 }
476
477 static int
478 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
479 {
480 struct f_uac2 *uac2 = func_to_uac2(fn);
481 struct g_audio *agdev = func_to_g_audio(fn);
482 struct usb_composite_dev *cdev = cfg->cdev;
483 struct usb_gadget *gadget = cdev->gadget;
484 struct device *dev = &gadget->dev;
485 struct f_uac2_opts *uac2_opts;
486 struct usb_string *us;
487 int ret;
488
489 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
490
491 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
492 if (IS_ERR(us))
493 return PTR_ERR(us);
494 iad_desc.iFunction = us[STR_ASSOC].id;
495 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
496 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
497 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
498 usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
499 io_in_it_desc.iTerminal = us[STR_IO_IT].id;
500 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
501 io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
502 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
503 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
504 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
505 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
506
507
508 /* Initialize the configurable parameters */
509 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
510 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
511 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
512 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
513 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
514 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
515 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
516 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
517 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
518 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
519 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
520 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
521
522 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
523 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
524
525 ret = usb_interface_id(cfg, fn);
526 if (ret < 0) {
527 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
528 return ret;
529 }
530 std_ac_if_desc.bInterfaceNumber = ret;
531 uac2->ac_intf = ret;
532 uac2->ac_alt = 0;
533
534 ret = usb_interface_id(cfg, fn);
535 if (ret < 0) {
536 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
537 return ret;
538 }
539 std_as_out_if0_desc.bInterfaceNumber = ret;
540 std_as_out_if1_desc.bInterfaceNumber = ret;
541 uac2->as_out_intf = ret;
542 uac2->as_out_alt = 0;
543
544 ret = usb_interface_id(cfg, fn);
545 if (ret < 0) {
546 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
547 return ret;
548 }
549 std_as_in_if0_desc.bInterfaceNumber = ret;
550 std_as_in_if1_desc.bInterfaceNumber = ret;
551 uac2->as_in_intf = ret;
552 uac2->as_in_alt = 0;
553
554 /* Calculate wMaxPacketSize according to audio bandwidth */
555 set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
556 set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
557 set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
558 set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
559
560 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
561 if (!agdev->out_ep) {
562 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
563 return ret;
564 }
565
566 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
567 if (!agdev->in_ep) {
568 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
569 return ret;
570 }
571
572 agdev->in_ep_maxpsize = max(fs_epin_desc.wMaxPacketSize,
573 hs_epin_desc.wMaxPacketSize);
574 agdev->out_ep_maxpsize = max(fs_epout_desc.wMaxPacketSize,
575 hs_epout_desc.wMaxPacketSize);
576
577 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
578 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
579
580 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL,
581 NULL);
582 if (ret)
583 return ret;
584
585 agdev->gadget = gadget;
586
587 agdev->params.p_chmask = uac2_opts->p_chmask;
588 agdev->params.p_srate = uac2_opts->p_srate;
589 agdev->params.p_ssize = uac2_opts->p_ssize;
590 agdev->params.c_chmask = uac2_opts->c_chmask;
591 agdev->params.c_srate = uac2_opts->c_srate;
592 agdev->params.c_ssize = uac2_opts->c_ssize;
593 agdev->params.req_number = uac2_opts->req_number;
594 ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
595 if (ret)
596 goto err_free_descs;
597 return 0;
598
599 err_free_descs:
600 usb_free_all_descriptors(fn);
601 agdev->gadget = NULL;
602 return ret;
603 }
604
605 static int
606 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
607 {
608 struct usb_composite_dev *cdev = fn->config->cdev;
609 struct f_uac2 *uac2 = func_to_uac2(fn);
610 struct usb_gadget *gadget = cdev->gadget;
611 struct device *dev = &gadget->dev;
612 int ret = 0;
613
614 /* No i/f has more than 2 alt settings */
615 if (alt > 1) {
616 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
617 return -EINVAL;
618 }
619
620 if (intf == uac2->ac_intf) {
621 /* Control I/f has only 1 AltSetting - 0 */
622 if (alt) {
623 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
624 return -EINVAL;
625 }
626 return 0;
627 }
628
629 if (intf == uac2->as_out_intf) {
630 uac2->as_out_alt = alt;
631
632 if (alt)
633 ret = u_audio_start_capture(&uac2->g_audio);
634 else
635 u_audio_stop_capture(&uac2->g_audio);
636 } else if (intf == uac2->as_in_intf) {
637 uac2->as_in_alt = alt;
638
639 if (alt)
640 ret = u_audio_start_playback(&uac2->g_audio);
641 else
642 u_audio_stop_playback(&uac2->g_audio);
643 } else {
644 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
645 return -EINVAL;
646 }
647
648 return ret;
649 }
650
651 static int
652 afunc_get_alt(struct usb_function *fn, unsigned intf)
653 {
654 struct f_uac2 *uac2 = func_to_uac2(fn);
655 struct g_audio *agdev = func_to_g_audio(fn);
656
657 if (intf == uac2->ac_intf)
658 return uac2->ac_alt;
659 else if (intf == uac2->as_out_intf)
660 return uac2->as_out_alt;
661 else if (intf == uac2->as_in_intf)
662 return uac2->as_in_alt;
663 else
664 dev_err(&agdev->gadget->dev,
665 "%s:%d Invalid Interface %d!\n",
666 __func__, __LINE__, intf);
667
668 return -EINVAL;
669 }
670
671 static void
672 afunc_disable(struct usb_function *fn)
673 {
674 struct f_uac2 *uac2 = func_to_uac2(fn);
675
676 uac2->as_in_alt = 0;
677 uac2->as_out_alt = 0;
678 u_audio_stop_capture(&uac2->g_audio);
679 u_audio_stop_playback(&uac2->g_audio);
680 }
681
682 static int
683 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
684 {
685 struct usb_request *req = fn->config->cdev->req;
686 struct g_audio *agdev = func_to_g_audio(fn);
687 struct f_uac2_opts *opts;
688 u16 w_length = le16_to_cpu(cr->wLength);
689 u16 w_index = le16_to_cpu(cr->wIndex);
690 u16 w_value = le16_to_cpu(cr->wValue);
691 u8 entity_id = (w_index >> 8) & 0xff;
692 u8 control_selector = w_value >> 8;
693 int value = -EOPNOTSUPP;
694 int p_srate, c_srate;
695
696 opts = g_audio_to_uac2_opts(agdev);
697 p_srate = opts->p_srate;
698 c_srate = opts->c_srate;
699
700 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
701 struct cntrl_cur_lay3 c;
702 memset(&c, 0, sizeof(struct cntrl_cur_lay3));
703
704 if (entity_id == USB_IN_CLK_ID)
705 c.dCUR = p_srate;
706 else if (entity_id == USB_OUT_CLK_ID)
707 c.dCUR = c_srate;
708
709 value = min_t(unsigned, w_length, sizeof c);
710 memcpy(req->buf, &c, value);
711 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
712 *(u8 *)req->buf = 1;
713 value = min_t(unsigned, w_length, 1);
714 } else {
715 dev_err(&agdev->gadget->dev,
716 "%s:%d control_selector=%d TODO!\n",
717 __func__, __LINE__, control_selector);
718 }
719
720 return value;
721 }
722
723 static int
724 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
725 {
726 struct usb_request *req = fn->config->cdev->req;
727 struct g_audio *agdev = func_to_g_audio(fn);
728 struct f_uac2_opts *opts;
729 u16 w_length = le16_to_cpu(cr->wLength);
730 u16 w_index = le16_to_cpu(cr->wIndex);
731 u16 w_value = le16_to_cpu(cr->wValue);
732 u8 entity_id = (w_index >> 8) & 0xff;
733 u8 control_selector = w_value >> 8;
734 struct cntrl_range_lay3 r;
735 int value = -EOPNOTSUPP;
736 int p_srate, c_srate;
737
738 opts = g_audio_to_uac2_opts(agdev);
739 p_srate = opts->p_srate;
740 c_srate = opts->c_srate;
741
742 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
743 if (entity_id == USB_IN_CLK_ID)
744 r.dMIN = p_srate;
745 else if (entity_id == USB_OUT_CLK_ID)
746 r.dMIN = c_srate;
747 else
748 return -EOPNOTSUPP;
749
750 r.dMAX = r.dMIN;
751 r.dRES = 0;
752 r.wNumSubRanges = 1;
753
754 value = min_t(unsigned, w_length, sizeof r);
755 memcpy(req->buf, &r, value);
756 } else {
757 dev_err(&agdev->gadget->dev,
758 "%s:%d control_selector=%d TODO!\n",
759 __func__, __LINE__, control_selector);
760 }
761
762 return value;
763 }
764
765 static int
766 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
767 {
768 if (cr->bRequest == UAC2_CS_CUR)
769 return in_rq_cur(fn, cr);
770 else if (cr->bRequest == UAC2_CS_RANGE)
771 return in_rq_range(fn, cr);
772 else
773 return -EOPNOTSUPP;
774 }
775
776 static int
777 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
778 {
779 u16 w_length = le16_to_cpu(cr->wLength);
780 u16 w_value = le16_to_cpu(cr->wValue);
781 u8 control_selector = w_value >> 8;
782
783 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
784 return w_length;
785
786 return -EOPNOTSUPP;
787 }
788
789 static int
790 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
791 {
792 struct f_uac2 *uac2 = func_to_uac2(fn);
793 struct g_audio *agdev = func_to_g_audio(fn);
794 u16 w_index = le16_to_cpu(cr->wIndex);
795 u8 intf = w_index & 0xff;
796
797 if (intf != uac2->ac_intf) {
798 dev_err(&agdev->gadget->dev,
799 "%s:%d Error!\n", __func__, __LINE__);
800 return -EOPNOTSUPP;
801 }
802
803 if (cr->bRequestType & USB_DIR_IN)
804 return ac_rq_in(fn, cr);
805 else if (cr->bRequest == UAC2_CS_CUR)
806 return out_rq_cur(fn, cr);
807
808 return -EOPNOTSUPP;
809 }
810
811 static int
812 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
813 {
814 struct usb_composite_dev *cdev = fn->config->cdev;
815 struct g_audio *agdev = func_to_g_audio(fn);
816 struct usb_request *req = cdev->req;
817 u16 w_length = le16_to_cpu(cr->wLength);
818 int value = -EOPNOTSUPP;
819
820 /* Only Class specific requests are supposed to reach here */
821 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
822 return -EOPNOTSUPP;
823
824 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
825 value = setup_rq_inf(fn, cr);
826 else
827 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
828 __func__, __LINE__);
829
830 if (value >= 0) {
831 req->length = value;
832 req->zero = value < w_length;
833 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
834 if (value < 0) {
835 dev_err(&agdev->gadget->dev,
836 "%s:%d Error!\n", __func__, __LINE__);
837 req->status = 0;
838 }
839 }
840
841 return value;
842 }
843
844 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
845 {
846 return container_of(to_config_group(item), struct f_uac2_opts,
847 func_inst.group);
848 }
849
850 static void f_uac2_attr_release(struct config_item *item)
851 {
852 struct f_uac2_opts *opts = to_f_uac2_opts(item);
853
854 usb_put_function_instance(&opts->func_inst);
855 }
856
857 static struct configfs_item_operations f_uac2_item_ops = {
858 .release = f_uac2_attr_release,
859 };
860
861 #define UAC2_ATTRIBUTE(name) \
862 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
863 char *page) \
864 { \
865 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
866 int result; \
867 \
868 mutex_lock(&opts->lock); \
869 result = sprintf(page, "%u\n", opts->name); \
870 mutex_unlock(&opts->lock); \
871 \
872 return result; \
873 } \
874 \
875 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
876 const char *page, size_t len) \
877 { \
878 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
879 int ret; \
880 u32 num; \
881 \
882 mutex_lock(&opts->lock); \
883 if (opts->refcnt) { \
884 ret = -EBUSY; \
885 goto end; \
886 } \
887 \
888 ret = kstrtou32(page, 0, &num); \
889 if (ret) \
890 goto end; \
891 \
892 opts->name = num; \
893 ret = len; \
894 \
895 end: \
896 mutex_unlock(&opts->lock); \
897 return ret; \
898 } \
899 \
900 CONFIGFS_ATTR(f_uac2_opts_, name)
901
902 UAC2_ATTRIBUTE(p_chmask);
903 UAC2_ATTRIBUTE(p_srate);
904 UAC2_ATTRIBUTE(p_ssize);
905 UAC2_ATTRIBUTE(c_chmask);
906 UAC2_ATTRIBUTE(c_srate);
907 UAC2_ATTRIBUTE(c_ssize);
908 UAC2_ATTRIBUTE(req_number);
909
910 static struct configfs_attribute *f_uac2_attrs[] = {
911 &f_uac2_opts_attr_p_chmask,
912 &f_uac2_opts_attr_p_srate,
913 &f_uac2_opts_attr_p_ssize,
914 &f_uac2_opts_attr_c_chmask,
915 &f_uac2_opts_attr_c_srate,
916 &f_uac2_opts_attr_c_ssize,
917 &f_uac2_opts_attr_req_number,
918 NULL,
919 };
920
921 static struct config_item_type f_uac2_func_type = {
922 .ct_item_ops = &f_uac2_item_ops,
923 .ct_attrs = f_uac2_attrs,
924 .ct_owner = THIS_MODULE,
925 };
926
927 static void afunc_free_inst(struct usb_function_instance *f)
928 {
929 struct f_uac2_opts *opts;
930
931 opts = container_of(f, struct f_uac2_opts, func_inst);
932 kfree(opts);
933 }
934
935 static struct usb_function_instance *afunc_alloc_inst(void)
936 {
937 struct f_uac2_opts *opts;
938
939 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
940 if (!opts)
941 return ERR_PTR(-ENOMEM);
942
943 mutex_init(&opts->lock);
944 opts->func_inst.free_func_inst = afunc_free_inst;
945
946 config_group_init_type_name(&opts->func_inst.group, "",
947 &f_uac2_func_type);
948
949 opts->p_chmask = UAC2_DEF_PCHMASK;
950 opts->p_srate = UAC2_DEF_PSRATE;
951 opts->p_ssize = UAC2_DEF_PSSIZE;
952 opts->c_chmask = UAC2_DEF_CCHMASK;
953 opts->c_srate = UAC2_DEF_CSRATE;
954 opts->c_ssize = UAC2_DEF_CSSIZE;
955 opts->req_number = UAC2_DEF_REQ_NUM;
956 return &opts->func_inst;
957 }
958
959 static void afunc_free(struct usb_function *f)
960 {
961 struct g_audio *agdev;
962 struct f_uac2_opts *opts;
963
964 agdev = func_to_g_audio(f);
965 opts = container_of(f->fi, struct f_uac2_opts, func_inst);
966 kfree(agdev);
967 mutex_lock(&opts->lock);
968 --opts->refcnt;
969 mutex_unlock(&opts->lock);
970 }
971
972 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
973 {
974 struct g_audio *agdev = func_to_g_audio(f);
975
976 g_audio_cleanup(agdev);
977 usb_free_all_descriptors(f);
978
979 agdev->gadget = NULL;
980 }
981
982 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
983 {
984 struct f_uac2 *uac2;
985 struct f_uac2_opts *opts;
986
987 uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
988 if (uac2 == NULL)
989 return ERR_PTR(-ENOMEM);
990
991 opts = container_of(fi, struct f_uac2_opts, func_inst);
992 mutex_lock(&opts->lock);
993 ++opts->refcnt;
994 mutex_unlock(&opts->lock);
995
996 uac2->g_audio.func.name = "uac2_func";
997 uac2->g_audio.func.bind = afunc_bind;
998 uac2->g_audio.func.unbind = afunc_unbind;
999 uac2->g_audio.func.set_alt = afunc_set_alt;
1000 uac2->g_audio.func.get_alt = afunc_get_alt;
1001 uac2->g_audio.func.disable = afunc_disable;
1002 uac2->g_audio.func.setup = afunc_setup;
1003 uac2->g_audio.func.free_func = afunc_free;
1004
1005 return &uac2->g_audio.func;
1006 }
1007
1008 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1009 MODULE_LICENSE("GPL");
1010 MODULE_AUTHOR("Yadwinder Singh");
1011 MODULE_AUTHOR("Jaswinder Singh");
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