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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/platform_device.h>
17#include <linux/module.h>
18
19#include <sound/core.h>
20#include <sound/pcm.h>
21#include <sound/pcm_params.h>
22
23#include "u_uac2.h"
24
25/* Keep everyone on toes */
26#define USB_XFERS 2
27
28/*
29 * The driver implements a simple UAC_2 topology.
30 * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
31 * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
32 * Capture and Playback sampling rates are independently
33 * controlled by two clock sources :
34 * CLK_5 := c_srate, and CLK_6 := p_srate
35 */
36#define USB_OUT_IT_ID 1
37#define IO_IN_IT_ID 2
38#define IO_OUT_OT_ID 3
39#define USB_IN_OT_ID 4
40#define USB_OUT_CLK_ID 5
41#define USB_IN_CLK_ID 6
42
43#define CONTROL_ABSENT 0
44#define CONTROL_RDONLY 1
45#define CONTROL_RDWR 3
46
47#define CLK_FREQ_CTRL 0
48#define CLK_VLD_CTRL 2
49
50#define COPY_CTRL 0
51#define CONN_CTRL 2
52#define OVRLD_CTRL 4
53#define CLSTR_CTRL 6
54#define UNFLW_CTRL 8
55#define OVFLW_CTRL 10
56
57static const char *uac2_name = "snd_uac2";
58
59struct uac2_req {
60 struct uac2_rtd_params *pp; /* parent param */
61 struct usb_request *req;
62};
63
64struct uac2_rtd_params {
65 struct snd_uac2_chip *uac2; /* parent chip */
66 bool ep_enabled; /* if the ep is enabled */
67 /* Size of the ring buffer */
68 size_t dma_bytes;
69 unsigned char *dma_area;
70
71 struct snd_pcm_substream *ss;
72
73 /* Ring buffer */
74 ssize_t hw_ptr;
75
76 void *rbuf;
77
78 size_t period_size;
79
80 unsigned max_psize;
81 struct uac2_req ureq[USB_XFERS];
82
83 spinlock_t lock;
84};
85
86struct snd_uac2_chip {
87 struct platform_device pdev;
88 struct platform_driver pdrv;
89
90 struct uac2_rtd_params p_prm;
91 struct uac2_rtd_params c_prm;
92
93 struct snd_card *card;
94 struct snd_pcm *pcm;
95
96 /* timekeeping for the playback endpoint */
97 unsigned int p_interval;
98 unsigned int p_residue;
99
100 /* pre-calculated values for playback iso completion */
101 unsigned int p_pktsize;
102 unsigned int p_pktsize_residue;
103 unsigned int p_framesize;
104};
105
106#define BUFF_SIZE_MAX (PAGE_SIZE * 16)
107#define PRD_SIZE_MAX PAGE_SIZE
108#define MIN_PERIODS 4
109
110static struct snd_pcm_hardware uac2_pcm_hardware = {
111 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
112 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
113 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
114 .rates = SNDRV_PCM_RATE_CONTINUOUS,
115 .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
116 .buffer_bytes_max = BUFF_SIZE_MAX,
117 .period_bytes_max = PRD_SIZE_MAX,
118 .periods_min = MIN_PERIODS,
119};
120
121struct audio_dev {
122 u8 ac_intf, ac_alt;
123 u8 as_out_intf, as_out_alt;
124 u8 as_in_intf, as_in_alt;
125
126 struct usb_ep *in_ep, *out_ep;
127 struct usb_function func;
128
129 /* The ALSA Sound Card it represents on the USB-Client side */
130 struct snd_uac2_chip uac2;
131};
132
133static inline
134struct audio_dev *func_to_agdev(struct usb_function *f)
135{
136 return container_of(f, struct audio_dev, func);
137}
138
139static inline
140struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
141{
142 return container_of(u, struct audio_dev, uac2);
143}
144
145static inline
146struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
147{
148 return container_of(p, struct snd_uac2_chip, pdev);
149}
150
151static inline
152struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev)
153{
154 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
155}
156
157static inline
158uint num_channels(uint chanmask)
159{
160 uint num = 0;
161
162 while (chanmask) {
163 num += (chanmask & 1);
164 chanmask >>= 1;
165 }
166
167 return num;
168}
169
170static void
171agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
172{
173 unsigned pending;
174 unsigned long flags;
175 unsigned int hw_ptr;
176 bool update_alsa = false;
177 int status = req->status;
178 struct uac2_req *ur = req->context;
179 struct snd_pcm_substream *substream;
180 struct uac2_rtd_params *prm = ur->pp;
181 struct snd_uac2_chip *uac2 = prm->uac2;
182
183 /* i/f shutting down */
184 if (!prm->ep_enabled || req->status == -ESHUTDOWN)
185 return;
186
187 /*
188 * We can't really do much about bad xfers.
189 * Afterall, the ISOCH xfers could fail legitimately.
190 */
191 if (status)
192 pr_debug("%s: iso_complete status(%d) %d/%d\n",
193 __func__, status, req->actual, req->length);
194
195 substream = prm->ss;
196
197 /* Do nothing if ALSA isn't active */
198 if (!substream)
199 goto exit;
200
201 spin_lock_irqsave(&prm->lock, flags);
202
203 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
204 /*
205 * For each IN packet, take the quotient of the current data
206 * rate and the endpoint's interval as the base packet size.
207 * If there is a residue from this division, add it to the
208 * residue accumulator.
209 */
210 req->length = uac2->p_pktsize;
211 uac2->p_residue += uac2->p_pktsize_residue;
212
213 /*
214 * Whenever there are more bytes in the accumulator than we
215 * need to add one more sample frame, increase this packet's
216 * size and decrease the accumulator.
217 */
218 if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) {
219 req->length += uac2->p_framesize;
220 uac2->p_residue -= uac2->p_framesize *
221 uac2->p_interval;
222 }
223
224 req->actual = req->length;
225 }
226
227 pending = prm->hw_ptr % prm->period_size;
228 pending += req->actual;
229 if (pending >= prm->period_size)
230 update_alsa = true;
231
232 hw_ptr = prm->hw_ptr;
233 prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
234
235 spin_unlock_irqrestore(&prm->lock, flags);
236
237 /* Pack USB load in ALSA ring buffer */
238 pending = prm->dma_bytes - hw_ptr;
239
240 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
241 if (unlikely(pending < req->actual)) {
242 memcpy(req->buf, prm->dma_area + hw_ptr, pending);
243 memcpy(req->buf + pending, prm->dma_area,
244 req->actual - pending);
245 } else {
246 memcpy(req->buf, prm->dma_area + hw_ptr, req->actual);
247 }
248 } else {
249 if (unlikely(pending < req->actual)) {
250 memcpy(prm->dma_area + hw_ptr, req->buf, pending);
251 memcpy(prm->dma_area, req->buf + pending,
252 req->actual - pending);
253 } else {
254 memcpy(prm->dma_area + hw_ptr, req->buf, req->actual);
255 }
256 }
257
258exit:
259 if (usb_ep_queue(ep, req, GFP_ATOMIC))
260 dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
261
262 if (update_alsa)
263 snd_pcm_period_elapsed(substream);
264
265 return;
266}
267
268static int
269uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
270{
271 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
272 struct uac2_rtd_params *prm;
273 unsigned long flags;
274 int err = 0;
275
276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
277 prm = &uac2->p_prm;
278 else
279 prm = &uac2->c_prm;
280
281 spin_lock_irqsave(&prm->lock, flags);
282
283 /* Reset */
284 prm->hw_ptr = 0;
285
286 switch (cmd) {
287 case SNDRV_PCM_TRIGGER_START:
288 case SNDRV_PCM_TRIGGER_RESUME:
289 prm->ss = substream;
290 break;
291 case SNDRV_PCM_TRIGGER_STOP:
292 case SNDRV_PCM_TRIGGER_SUSPEND:
293 prm->ss = NULL;
294 break;
295 default:
296 err = -EINVAL;
297 }
298
299 spin_unlock_irqrestore(&prm->lock, flags);
300
301 /* Clear buffer after Play stops */
302 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
303 memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
304
305 return err;
306}
307
308static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream)
309{
310 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
311 struct uac2_rtd_params *prm;
312
313 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
314 prm = &uac2->p_prm;
315 else
316 prm = &uac2->c_prm;
317
318 return bytes_to_frames(substream->runtime, prm->hw_ptr);
319}
320
321static int uac2_pcm_hw_params(struct snd_pcm_substream *substream,
322 struct snd_pcm_hw_params *hw_params)
323{
324 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
325 struct uac2_rtd_params *prm;
326 int err;
327
328 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
329 prm = &uac2->p_prm;
330 else
331 prm = &uac2->c_prm;
332
333 err = snd_pcm_lib_malloc_pages(substream,
334 params_buffer_bytes(hw_params));
335 if (err >= 0) {
336 prm->dma_bytes = substream->runtime->dma_bytes;
337 prm->dma_area = substream->runtime->dma_area;
338 prm->period_size = params_period_bytes(hw_params);
339 }
340
341 return err;
342}
343
344static int uac2_pcm_hw_free(struct snd_pcm_substream *substream)
345{
346 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
347 struct uac2_rtd_params *prm;
348
349 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
350 prm = &uac2->p_prm;
351 else
352 prm = &uac2->c_prm;
353
354 prm->dma_area = NULL;
355 prm->dma_bytes = 0;
356 prm->period_size = 0;
357
358 return snd_pcm_lib_free_pages(substream);
359}
360
361static int uac2_pcm_open(struct snd_pcm_substream *substream)
362{
363 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
364 struct snd_pcm_runtime *runtime = substream->runtime;
365 struct audio_dev *audio_dev;
366 struct f_uac2_opts *opts;
367 int p_ssize, c_ssize;
368 int p_srate, c_srate;
369 int p_chmask, c_chmask;
370
371 audio_dev = uac2_to_agdev(uac2);
372 opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
373 p_ssize = opts->p_ssize;
374 c_ssize = opts->c_ssize;
375 p_srate = opts->p_srate;
376 c_srate = opts->c_srate;
377 p_chmask = opts->p_chmask;
378 c_chmask = opts->c_chmask;
379 uac2->p_residue = 0;
380
381 runtime->hw = uac2_pcm_hardware;
382
383 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
384 spin_lock_init(&uac2->p_prm.lock);
385 runtime->hw.rate_min = p_srate;
386 switch (p_ssize) {
387 case 3:
388 runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
389 break;
390 case 4:
391 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
392 break;
393 default:
394 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
395 break;
396 }
397 runtime->hw.channels_min = num_channels(p_chmask);
398 runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize
399 / runtime->hw.periods_min;
400 } else {
401 spin_lock_init(&uac2->c_prm.lock);
402 runtime->hw.rate_min = c_srate;
403 switch (c_ssize) {
404 case 3:
405 runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
406 break;
407 case 4:
408 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
409 break;
410 default:
411 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
412 break;
413 }
414 runtime->hw.channels_min = num_channels(c_chmask);
415 runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize
416 / runtime->hw.periods_min;
417 }
418
419 runtime->hw.rate_max = runtime->hw.rate_min;
420 runtime->hw.channels_max = runtime->hw.channels_min;
421
422 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
423
424 return 0;
425}
426
427/* ALSA cries without these function pointers */
428static int uac2_pcm_null(struct snd_pcm_substream *substream)
429{
430 return 0;
431}
432
433static struct snd_pcm_ops uac2_pcm_ops = {
434 .open = uac2_pcm_open,
435 .close = uac2_pcm_null,
436 .ioctl = snd_pcm_lib_ioctl,
437 .hw_params = uac2_pcm_hw_params,
438 .hw_free = uac2_pcm_hw_free,
439 .trigger = uac2_pcm_trigger,
440 .pointer = uac2_pcm_pointer,
441 .prepare = uac2_pcm_null,
442};
443
444static int snd_uac2_probe(struct platform_device *pdev)
445{
446 struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
447 struct snd_card *card;
448 struct snd_pcm *pcm;
449 struct audio_dev *audio_dev;
450 struct f_uac2_opts *opts;
451 int err;
452 int p_chmask, c_chmask;
453
454 audio_dev = uac2_to_agdev(uac2);
455 opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
456 p_chmask = opts->p_chmask;
457 c_chmask = opts->c_chmask;
458
459 /* Choose any slot, with no id */
460 err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
461 if (err < 0)
462 return err;
463
464 uac2->card = card;
465
466 /*
467 * Create first PCM device
468 * Create a substream only for non-zero channel streams
469 */
470 err = snd_pcm_new(uac2->card, "UAC2 PCM", 0,
471 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
472 if (err < 0)
473 goto snd_fail;
474
475 strcpy(pcm->name, "UAC2 PCM");
476 pcm->private_data = uac2;
477
478 uac2->pcm = pcm;
479
480 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops);
481 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops);
482
483 strcpy(card->driver, "UAC2_Gadget");
484 strcpy(card->shortname, "UAC2_Gadget");
485 sprintf(card->longname, "UAC2_Gadget %i", pdev->id);
486
487 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
488 snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
489
490 err = snd_card_register(card);
491 if (!err) {
492 platform_set_drvdata(pdev, card);
493 return 0;
494 }
495
496snd_fail:
497 snd_card_free(card);
498
499 uac2->pcm = NULL;
500 uac2->card = NULL;
501
502 return err;
503}
504
505static int snd_uac2_remove(struct platform_device *pdev)
506{
507 struct snd_card *card = platform_get_drvdata(pdev);
508
509 if (card)
510 return snd_card_free(card);
511
512 return 0;
513}
514
515static void snd_uac2_release(struct device *dev)
516{
517 dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
518}
519
520static int alsa_uac2_init(struct audio_dev *agdev)
521{
522 struct snd_uac2_chip *uac2 = &agdev->uac2;
523 int err;
524
525 uac2->pdrv.probe = snd_uac2_probe;
526 uac2->pdrv.remove = snd_uac2_remove;
527 uac2->pdrv.driver.name = uac2_name;
528
529 uac2->pdev.id = 0;
530 uac2->pdev.name = uac2_name;
531 uac2->pdev.dev.release = snd_uac2_release;
532
533 /* Register snd_uac2 driver */
534 err = platform_driver_register(&uac2->pdrv);
535 if (err)
536 return err;
537
538 /* Register snd_uac2 device */
539 err = platform_device_register(&uac2->pdev);
540 if (err)
541 platform_driver_unregister(&uac2->pdrv);
542
543 return err;
544}
545
546static void alsa_uac2_exit(struct audio_dev *agdev)
547{
548 struct snd_uac2_chip *uac2 = &agdev->uac2;
549
550 platform_driver_unregister(&uac2->pdrv);
551 platform_device_unregister(&uac2->pdev);
552}
553
554
555/* --------- USB Function Interface ------------- */
556
557enum {
558 STR_ASSOC,
559 STR_IF_CTRL,
560 STR_CLKSRC_IN,
561 STR_CLKSRC_OUT,
562 STR_USB_IT,
563 STR_IO_IT,
564 STR_USB_OT,
565 STR_IO_OT,
566 STR_AS_OUT_ALT0,
567 STR_AS_OUT_ALT1,
568 STR_AS_IN_ALT0,
569 STR_AS_IN_ALT1,
570};
571
572static char clksrc_in[8];
573static char clksrc_out[8];
574
575static struct usb_string strings_fn[] = {
576 [STR_ASSOC].s = "Source/Sink",
577 [STR_IF_CTRL].s = "Topology Control",
578 [STR_CLKSRC_IN].s = clksrc_in,
579 [STR_CLKSRC_OUT].s = clksrc_out,
580 [STR_USB_IT].s = "USBH Out",
581 [STR_IO_IT].s = "USBD Out",
582 [STR_USB_OT].s = "USBH In",
583 [STR_IO_OT].s = "USBD In",
584 [STR_AS_OUT_ALT0].s = "Playback Inactive",
585 [STR_AS_OUT_ALT1].s = "Playback Active",
586 [STR_AS_IN_ALT0].s = "Capture Inactive",
587 [STR_AS_IN_ALT1].s = "Capture Active",
588 { },
589};
590
591static struct usb_gadget_strings str_fn = {
592 .language = 0x0409, /* en-us */
593 .strings = strings_fn,
594};
595
596static struct usb_gadget_strings *fn_strings[] = {
597 &str_fn,
598 NULL,
599};
600
601static struct usb_interface_assoc_descriptor iad_desc = {
602 .bLength = sizeof iad_desc,
603 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
604
605 .bFirstInterface = 0,
606 .bInterfaceCount = 3,
607 .bFunctionClass = USB_CLASS_AUDIO,
608 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
609 .bFunctionProtocol = UAC_VERSION_2,
610};
611
612/* Audio Control Interface */
613static struct usb_interface_descriptor std_ac_if_desc = {
614 .bLength = sizeof std_ac_if_desc,
615 .bDescriptorType = USB_DT_INTERFACE,
616
617 .bAlternateSetting = 0,
618 .bNumEndpoints = 0,
619 .bInterfaceClass = USB_CLASS_AUDIO,
620 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
621 .bInterfaceProtocol = UAC_VERSION_2,
622};
623
624/* Clock source for IN traffic */
625static struct uac_clock_source_descriptor in_clk_src_desc = {
626 .bLength = sizeof in_clk_src_desc,
627 .bDescriptorType = USB_DT_CS_INTERFACE,
628
629 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
630 .bClockID = USB_IN_CLK_ID,
631 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
632 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
633 .bAssocTerminal = 0,
634};
635
636/* Clock source for OUT traffic */
637static struct uac_clock_source_descriptor out_clk_src_desc = {
638 .bLength = sizeof out_clk_src_desc,
639 .bDescriptorType = USB_DT_CS_INTERFACE,
640
641 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
642 .bClockID = USB_OUT_CLK_ID,
643 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
644 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
645 .bAssocTerminal = 0,
646};
647
648/* Input Terminal for USB_OUT */
649static struct uac2_input_terminal_descriptor usb_out_it_desc = {
650 .bLength = sizeof usb_out_it_desc,
651 .bDescriptorType = USB_DT_CS_INTERFACE,
652
653 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
654 .bTerminalID = USB_OUT_IT_ID,
655 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
656 .bAssocTerminal = 0,
657 .bCSourceID = USB_OUT_CLK_ID,
658 .iChannelNames = 0,
659 .bmControls = (CONTROL_RDWR << COPY_CTRL),
660};
661
662/* Input Terminal for I/O-In */
663static struct uac2_input_terminal_descriptor io_in_it_desc = {
664 .bLength = sizeof io_in_it_desc,
665 .bDescriptorType = USB_DT_CS_INTERFACE,
666
667 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
668 .bTerminalID = IO_IN_IT_ID,
669 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
670 .bAssocTerminal = 0,
671 .bCSourceID = USB_IN_CLK_ID,
672 .iChannelNames = 0,
673 .bmControls = (CONTROL_RDWR << COPY_CTRL),
674};
675
676/* Ouput Terminal for USB_IN */
677static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
678 .bLength = sizeof usb_in_ot_desc,
679 .bDescriptorType = USB_DT_CS_INTERFACE,
680
681 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
682 .bTerminalID = USB_IN_OT_ID,
683 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
684 .bAssocTerminal = 0,
685 .bSourceID = IO_IN_IT_ID,
686 .bCSourceID = USB_IN_CLK_ID,
687 .bmControls = (CONTROL_RDWR << COPY_CTRL),
688};
689
690/* Ouput Terminal for I/O-Out */
691static struct uac2_output_terminal_descriptor io_out_ot_desc = {
692 .bLength = sizeof io_out_ot_desc,
693 .bDescriptorType = USB_DT_CS_INTERFACE,
694
695 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
696 .bTerminalID = IO_OUT_OT_ID,
697 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
698 .bAssocTerminal = 0,
699 .bSourceID = USB_OUT_IT_ID,
700 .bCSourceID = USB_OUT_CLK_ID,
701 .bmControls = (CONTROL_RDWR << COPY_CTRL),
702};
703
704static struct uac2_ac_header_descriptor ac_hdr_desc = {
705 .bLength = sizeof ac_hdr_desc,
706 .bDescriptorType = USB_DT_CS_INTERFACE,
707
708 .bDescriptorSubtype = UAC_MS_HEADER,
709 .bcdADC = cpu_to_le16(0x200),
710 .bCategory = UAC2_FUNCTION_IO_BOX,
711 .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
712 + sizeof usb_out_it_desc + sizeof io_in_it_desc
713 + sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
714 .bmControls = 0,
715};
716
717/* Audio Streaming OUT Interface - Alt0 */
718static struct usb_interface_descriptor std_as_out_if0_desc = {
719 .bLength = sizeof std_as_out_if0_desc,
720 .bDescriptorType = USB_DT_INTERFACE,
721
722 .bAlternateSetting = 0,
723 .bNumEndpoints = 0,
724 .bInterfaceClass = USB_CLASS_AUDIO,
725 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
726 .bInterfaceProtocol = UAC_VERSION_2,
727};
728
729/* Audio Streaming OUT Interface - Alt1 */
730static struct usb_interface_descriptor std_as_out_if1_desc = {
731 .bLength = sizeof std_as_out_if1_desc,
732 .bDescriptorType = USB_DT_INTERFACE,
733
734 .bAlternateSetting = 1,
735 .bNumEndpoints = 1,
736 .bInterfaceClass = USB_CLASS_AUDIO,
737 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
738 .bInterfaceProtocol = UAC_VERSION_2,
739};
740
741/* Audio Stream OUT Intface Desc */
742static struct uac2_as_header_descriptor as_out_hdr_desc = {
743 .bLength = sizeof as_out_hdr_desc,
744 .bDescriptorType = USB_DT_CS_INTERFACE,
745
746 .bDescriptorSubtype = UAC_AS_GENERAL,
747 .bTerminalLink = USB_OUT_IT_ID,
748 .bmControls = 0,
749 .bFormatType = UAC_FORMAT_TYPE_I,
750 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
751 .iChannelNames = 0,
752};
753
754/* Audio USB_OUT Format */
755static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
756 .bLength = sizeof as_out_fmt1_desc,
757 .bDescriptorType = USB_DT_CS_INTERFACE,
758 .bDescriptorSubtype = UAC_FORMAT_TYPE,
759 .bFormatType = UAC_FORMAT_TYPE_I,
760};
761
762/* STD AS ISO OUT Endpoint */
763static struct usb_endpoint_descriptor fs_epout_desc = {
764 .bLength = USB_DT_ENDPOINT_SIZE,
765 .bDescriptorType = USB_DT_ENDPOINT,
766
767 .bEndpointAddress = USB_DIR_OUT,
768 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
769 .wMaxPacketSize = cpu_to_le16(1023),
770 .bInterval = 1,
771};
772
773static struct usb_endpoint_descriptor hs_epout_desc = {
774 .bLength = USB_DT_ENDPOINT_SIZE,
775 .bDescriptorType = USB_DT_ENDPOINT,
776
777 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
778 .wMaxPacketSize = cpu_to_le16(1024),
779 .bInterval = 4,
780};
781
782/* CS AS ISO OUT Endpoint */
783static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
784 .bLength = sizeof as_iso_out_desc,
785 .bDescriptorType = USB_DT_CS_ENDPOINT,
786
787 .bDescriptorSubtype = UAC_EP_GENERAL,
788 .bmAttributes = 0,
789 .bmControls = 0,
790 .bLockDelayUnits = 0,
791 .wLockDelay = 0,
792};
793
794/* Audio Streaming IN Interface - Alt0 */
795static struct usb_interface_descriptor std_as_in_if0_desc = {
796 .bLength = sizeof std_as_in_if0_desc,
797 .bDescriptorType = USB_DT_INTERFACE,
798
799 .bAlternateSetting = 0,
800 .bNumEndpoints = 0,
801 .bInterfaceClass = USB_CLASS_AUDIO,
802 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
803 .bInterfaceProtocol = UAC_VERSION_2,
804};
805
806/* Audio Streaming IN Interface - Alt1 */
807static struct usb_interface_descriptor std_as_in_if1_desc = {
808 .bLength = sizeof std_as_in_if1_desc,
809 .bDescriptorType = USB_DT_INTERFACE,
810
811 .bAlternateSetting = 1,
812 .bNumEndpoints = 1,
813 .bInterfaceClass = USB_CLASS_AUDIO,
814 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
815 .bInterfaceProtocol = UAC_VERSION_2,
816};
817
818/* Audio Stream IN Intface Desc */
819static struct uac2_as_header_descriptor as_in_hdr_desc = {
820 .bLength = sizeof as_in_hdr_desc,
821 .bDescriptorType = USB_DT_CS_INTERFACE,
822
823 .bDescriptorSubtype = UAC_AS_GENERAL,
824 .bTerminalLink = USB_IN_OT_ID,
825 .bmControls = 0,
826 .bFormatType = UAC_FORMAT_TYPE_I,
827 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
828 .iChannelNames = 0,
829};
830
831/* Audio USB_IN Format */
832static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
833 .bLength = sizeof as_in_fmt1_desc,
834 .bDescriptorType = USB_DT_CS_INTERFACE,
835 .bDescriptorSubtype = UAC_FORMAT_TYPE,
836 .bFormatType = UAC_FORMAT_TYPE_I,
837};
838
839/* STD AS ISO IN Endpoint */
840static struct usb_endpoint_descriptor fs_epin_desc = {
841 .bLength = USB_DT_ENDPOINT_SIZE,
842 .bDescriptorType = USB_DT_ENDPOINT,
843
844 .bEndpointAddress = USB_DIR_IN,
845 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
846 .wMaxPacketSize = cpu_to_le16(1023),
847 .bInterval = 1,
848};
849
850static struct usb_endpoint_descriptor hs_epin_desc = {
851 .bLength = USB_DT_ENDPOINT_SIZE,
852 .bDescriptorType = USB_DT_ENDPOINT,
853
854 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
855 .wMaxPacketSize = cpu_to_le16(1024),
856 .bInterval = 4,
857};
858
859/* CS AS ISO IN Endpoint */
860static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
861 .bLength = sizeof as_iso_in_desc,
862 .bDescriptorType = USB_DT_CS_ENDPOINT,
863
864 .bDescriptorSubtype = UAC_EP_GENERAL,
865 .bmAttributes = 0,
866 .bmControls = 0,
867 .bLockDelayUnits = 0,
868 .wLockDelay = 0,
869};
870
871static struct usb_descriptor_header *fs_audio_desc[] = {
872 (struct usb_descriptor_header *)&iad_desc,
873 (struct usb_descriptor_header *)&std_ac_if_desc,
874
875 (struct usb_descriptor_header *)&ac_hdr_desc,
876 (struct usb_descriptor_header *)&in_clk_src_desc,
877 (struct usb_descriptor_header *)&out_clk_src_desc,
878 (struct usb_descriptor_header *)&usb_out_it_desc,
879 (struct usb_descriptor_header *)&io_in_it_desc,
880 (struct usb_descriptor_header *)&usb_in_ot_desc,
881 (struct usb_descriptor_header *)&io_out_ot_desc,
882
883 (struct usb_descriptor_header *)&std_as_out_if0_desc,
884 (struct usb_descriptor_header *)&std_as_out_if1_desc,
885
886 (struct usb_descriptor_header *)&as_out_hdr_desc,
887 (struct usb_descriptor_header *)&as_out_fmt1_desc,
888 (struct usb_descriptor_header *)&fs_epout_desc,
889 (struct usb_descriptor_header *)&as_iso_out_desc,
890
891 (struct usb_descriptor_header *)&std_as_in_if0_desc,
892 (struct usb_descriptor_header *)&std_as_in_if1_desc,
893
894 (struct usb_descriptor_header *)&as_in_hdr_desc,
895 (struct usb_descriptor_header *)&as_in_fmt1_desc,
896 (struct usb_descriptor_header *)&fs_epin_desc,
897 (struct usb_descriptor_header *)&as_iso_in_desc,
898 NULL,
899};
900
901static struct usb_descriptor_header *hs_audio_desc[] = {
902 (struct usb_descriptor_header *)&iad_desc,
903 (struct usb_descriptor_header *)&std_ac_if_desc,
904
905 (struct usb_descriptor_header *)&ac_hdr_desc,
906 (struct usb_descriptor_header *)&in_clk_src_desc,
907 (struct usb_descriptor_header *)&out_clk_src_desc,
908 (struct usb_descriptor_header *)&usb_out_it_desc,
909 (struct usb_descriptor_header *)&io_in_it_desc,
910 (struct usb_descriptor_header *)&usb_in_ot_desc,
911 (struct usb_descriptor_header *)&io_out_ot_desc,
912
913 (struct usb_descriptor_header *)&std_as_out_if0_desc,
914 (struct usb_descriptor_header *)&std_as_out_if1_desc,
915
916 (struct usb_descriptor_header *)&as_out_hdr_desc,
917 (struct usb_descriptor_header *)&as_out_fmt1_desc,
918 (struct usb_descriptor_header *)&hs_epout_desc,
919 (struct usb_descriptor_header *)&as_iso_out_desc,
920
921 (struct usb_descriptor_header *)&std_as_in_if0_desc,
922 (struct usb_descriptor_header *)&std_as_in_if1_desc,
923
924 (struct usb_descriptor_header *)&as_in_hdr_desc,
925 (struct usb_descriptor_header *)&as_in_fmt1_desc,
926 (struct usb_descriptor_header *)&hs_epin_desc,
927 (struct usb_descriptor_header *)&as_iso_in_desc,
928 NULL,
929};
930
931struct cntrl_cur_lay3 {
932 __u32 dCUR;
933};
934
935struct cntrl_range_lay3 {
936 __u16 wNumSubRanges;
937 __u32 dMIN;
938 __u32 dMAX;
939 __u32 dRES;
940} __packed;
941
942static inline void
943free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
944{
945 struct snd_uac2_chip *uac2 = prm->uac2;
946 int i;
947
948 if (!prm->ep_enabled)
949 return;
950
951 prm->ep_enabled = false;
952
953 for (i = 0; i < USB_XFERS; i++) {
954 if (prm->ureq[i].req) {
955 usb_ep_dequeue(ep, prm->ureq[i].req);
956 usb_ep_free_request(ep, prm->ureq[i].req);
957 prm->ureq[i].req = NULL;
958 }
959 }
960
961 if (usb_ep_disable(ep))
962 dev_err(&uac2->pdev.dev,
963 "%s:%d Error!\n", __func__, __LINE__);
964}
965
966static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
967 struct usb_endpoint_descriptor *ep_desc,
968 unsigned int factor, bool is_playback)
969{
970 int chmask, srate, ssize;
971 u16 max_packet_size;
972
973 if (is_playback) {
974 chmask = uac2_opts->p_chmask;
975 srate = uac2_opts->p_srate;
976 ssize = uac2_opts->p_ssize;
977 } else {
978 chmask = uac2_opts->c_chmask;
979 srate = uac2_opts->c_srate;
980 ssize = uac2_opts->c_ssize;
981 }
982
983 max_packet_size = num_channels(chmask) * ssize *
984 DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)));
985 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size,
986 le16_to_cpu(ep_desc->wMaxPacketSize)));
987}
988
989static int
990afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
991{
992 struct audio_dev *agdev = func_to_agdev(fn);
993 struct snd_uac2_chip *uac2 = &agdev->uac2;
994 struct usb_composite_dev *cdev = cfg->cdev;
995 struct usb_gadget *gadget = cdev->gadget;
996 struct device *dev = &uac2->pdev.dev;
997 struct uac2_rtd_params *prm;
998 struct f_uac2_opts *uac2_opts;
999 struct usb_string *us;
1000 int ret;
1001
1002 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
1003
1004 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
1005 if (IS_ERR(us))
1006 return PTR_ERR(us);
1007 iad_desc.iFunction = us[STR_ASSOC].id;
1008 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
1009 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
1010 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
1011 usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
1012 io_in_it_desc.iTerminal = us[STR_IO_IT].id;
1013 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
1014 io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
1015 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
1016 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
1017 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
1018 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
1019
1020
1021 /* Initialize the configurable parameters */
1022 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1023 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1024 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1025 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1026 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1027 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1028 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1029 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1030 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1031 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1032 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1033 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1034
1035 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
1036 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
1037
1038 ret = usb_interface_id(cfg, fn);
1039 if (ret < 0) {
1040 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1041 return ret;
1042 }
1043 std_ac_if_desc.bInterfaceNumber = ret;
1044 agdev->ac_intf = ret;
1045 agdev->ac_alt = 0;
1046
1047 ret = usb_interface_id(cfg, fn);
1048 if (ret < 0) {
1049 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1050 return ret;
1051 }
1052 std_as_out_if0_desc.bInterfaceNumber = ret;
1053 std_as_out_if1_desc.bInterfaceNumber = ret;
1054 agdev->as_out_intf = ret;
1055 agdev->as_out_alt = 0;
1056
1057 ret = usb_interface_id(cfg, fn);
1058 if (ret < 0) {
1059 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1060 return ret;
1061 }
1062 std_as_in_if0_desc.bInterfaceNumber = ret;
1063 std_as_in_if1_desc.bInterfaceNumber = ret;
1064 agdev->as_in_intf = ret;
1065 agdev->as_in_alt = 0;
1066
1067 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1068 if (!agdev->out_ep) {
1069 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1070 return ret;
1071 }
1072
1073 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1074 if (!agdev->in_ep) {
1075 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1076 return ret;
1077 }
1078
1079 uac2->p_prm.uac2 = uac2;
1080 uac2->c_prm.uac2 = uac2;
1081
1082 /* Calculate wMaxPacketSize according to audio bandwidth */
1083 set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
1084 set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
1085 set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
1086 set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
1087
1088 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1089 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1090
1091 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL,
1092 NULL);
1093 if (ret)
1094 return ret;
1095
1096 prm = &agdev->uac2.c_prm;
1097 prm->max_psize = hs_epout_desc.wMaxPacketSize;
1098 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1099 if (!prm->rbuf) {
1100 prm->max_psize = 0;
1101 goto err_free_descs;
1102 }
1103
1104 prm = &agdev->uac2.p_prm;
1105 prm->max_psize = hs_epin_desc.wMaxPacketSize;
1106 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1107 if (!prm->rbuf) {
1108 prm->max_psize = 0;
1109 goto err;
1110 }
1111
1112 ret = alsa_uac2_init(agdev);
1113 if (ret)
1114 goto err;
1115 return 0;
1116
1117err:
1118 kfree(agdev->uac2.p_prm.rbuf);
1119 kfree(agdev->uac2.c_prm.rbuf);
1120err_free_descs:
1121 usb_free_all_descriptors(fn);
1122 return -EINVAL;
1123}
1124
1125static int
1126afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1127{
1128 struct usb_composite_dev *cdev = fn->config->cdev;
1129 struct audio_dev *agdev = func_to_agdev(fn);
1130 struct snd_uac2_chip *uac2 = &agdev->uac2;
1131 struct usb_gadget *gadget = cdev->gadget;
1132 struct device *dev = &uac2->pdev.dev;
1133 struct usb_request *req;
1134 struct usb_ep *ep;
1135 struct uac2_rtd_params *prm;
1136 int req_len, i;
1137
1138 /* No i/f has more than 2 alt settings */
1139 if (alt > 1) {
1140 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1141 return -EINVAL;
1142 }
1143
1144 if (intf == agdev->ac_intf) {
1145 /* Control I/f has only 1 AltSetting - 0 */
1146 if (alt) {
1147 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1148 return -EINVAL;
1149 }
1150 return 0;
1151 }
1152
1153 if (intf == agdev->as_out_intf) {
1154 ep = agdev->out_ep;
1155 prm = &uac2->c_prm;
1156 config_ep_by_speed(gadget, fn, ep);
1157 agdev->as_out_alt = alt;
1158 req_len = prm->max_psize;
1159 } else if (intf == agdev->as_in_intf) {
1160 struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
1161 unsigned int factor, rate;
1162 struct usb_endpoint_descriptor *ep_desc;
1163
1164 ep = agdev->in_ep;
1165 prm = &uac2->p_prm;
1166 config_ep_by_speed(gadget, fn, ep);
1167 agdev->as_in_alt = alt;
1168
1169 /* pre-calculate the playback endpoint's interval */
1170 if (gadget->speed == USB_SPEED_FULL) {
1171 ep_desc = &fs_epin_desc;
1172 factor = 1000;
1173 } else {
1174 ep_desc = &hs_epin_desc;
1175 factor = 8000;
1176 }
1177
1178 /* pre-compute some values for iso_complete() */
1179 uac2->p_framesize = opts->p_ssize *
1180 num_channels(opts->p_chmask);
1181 rate = opts->p_srate * uac2->p_framesize;
1182 uac2->p_interval = factor / (1 << (ep_desc->bInterval - 1));
1183 uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
1184 prm->max_psize);
1185
1186 if (uac2->p_pktsize < prm->max_psize)
1187 uac2->p_pktsize_residue = rate % uac2->p_interval;
1188 else
1189 uac2->p_pktsize_residue = 0;
1190
1191 req_len = uac2->p_pktsize;
1192 uac2->p_residue = 0;
1193 } else {
1194 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1195 return -EINVAL;
1196 }
1197
1198 if (alt == 0) {
1199 free_ep(prm, ep);
1200 return 0;
1201 }
1202
1203 prm->ep_enabled = true;
1204 usb_ep_enable(ep);
1205
1206 for (i = 0; i < USB_XFERS; i++) {
1207 if (!prm->ureq[i].req) {
1208 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
1209 if (req == NULL)
1210 return -ENOMEM;
1211
1212 prm->ureq[i].req = req;
1213 prm->ureq[i].pp = prm;
1214
1215 req->zero = 0;
1216 req->context = &prm->ureq[i];
1217 req->length = req_len;
1218 req->complete = agdev_iso_complete;
1219 req->buf = prm->rbuf + i * prm->max_psize;
1220 }
1221
1222 if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
1223 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1224 }
1225
1226 return 0;
1227}
1228
1229static int
1230afunc_get_alt(struct usb_function *fn, unsigned intf)
1231{
1232 struct audio_dev *agdev = func_to_agdev(fn);
1233 struct snd_uac2_chip *uac2 = &agdev->uac2;
1234
1235 if (intf == agdev->ac_intf)
1236 return agdev->ac_alt;
1237 else if (intf == agdev->as_out_intf)
1238 return agdev->as_out_alt;
1239 else if (intf == agdev->as_in_intf)
1240 return agdev->as_in_alt;
1241 else
1242 dev_err(&uac2->pdev.dev,
1243 "%s:%d Invalid Interface %d!\n",
1244 __func__, __LINE__, intf);
1245
1246 return -EINVAL;
1247}
1248
1249static void
1250afunc_disable(struct usb_function *fn)
1251{
1252 struct audio_dev *agdev = func_to_agdev(fn);
1253 struct snd_uac2_chip *uac2 = &agdev->uac2;
1254
1255 free_ep(&uac2->p_prm, agdev->in_ep);
1256 agdev->as_in_alt = 0;
1257
1258 free_ep(&uac2->c_prm, agdev->out_ep);
1259 agdev->as_out_alt = 0;
1260}
1261
1262static int
1263in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1264{
1265 struct usb_request *req = fn->config->cdev->req;
1266 struct audio_dev *agdev = func_to_agdev(fn);
1267 struct snd_uac2_chip *uac2 = &agdev->uac2;
1268 struct f_uac2_opts *opts;
1269 u16 w_length = le16_to_cpu(cr->wLength);
1270 u16 w_index = le16_to_cpu(cr->wIndex);
1271 u16 w_value = le16_to_cpu(cr->wValue);
1272 u8 entity_id = (w_index >> 8) & 0xff;
1273 u8 control_selector = w_value >> 8;
1274 int value = -EOPNOTSUPP;
1275 int p_srate, c_srate;
1276
1277 opts = agdev_to_uac2_opts(agdev);
1278 p_srate = opts->p_srate;
1279 c_srate = opts->c_srate;
1280
1281 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1282 struct cntrl_cur_lay3 c;
1283 memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1284
1285 if (entity_id == USB_IN_CLK_ID)
1286 c.dCUR = p_srate;
1287 else if (entity_id == USB_OUT_CLK_ID)
1288 c.dCUR = c_srate;
1289
1290 value = min_t(unsigned, w_length, sizeof c);
1291 memcpy(req->buf, &c, value);
1292 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1293 *(u8 *)req->buf = 1;
1294 value = min_t(unsigned, w_length, 1);
1295 } else {
1296 dev_err(&uac2->pdev.dev,
1297 "%s:%d control_selector=%d TODO!\n",
1298 __func__, __LINE__, control_selector);
1299 }
1300
1301 return value;
1302}
1303
1304static int
1305in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1306{
1307 struct usb_request *req = fn->config->cdev->req;
1308 struct audio_dev *agdev = func_to_agdev(fn);
1309 struct snd_uac2_chip *uac2 = &agdev->uac2;
1310 struct f_uac2_opts *opts;
1311 u16 w_length = le16_to_cpu(cr->wLength);
1312 u16 w_index = le16_to_cpu(cr->wIndex);
1313 u16 w_value = le16_to_cpu(cr->wValue);
1314 u8 entity_id = (w_index >> 8) & 0xff;
1315 u8 control_selector = w_value >> 8;
1316 struct cntrl_range_lay3 r;
1317 int value = -EOPNOTSUPP;
1318 int p_srate, c_srate;
1319
1320 opts = agdev_to_uac2_opts(agdev);
1321 p_srate = opts->p_srate;
1322 c_srate = opts->c_srate;
1323
1324 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1325 if (entity_id == USB_IN_CLK_ID)
1326 r.dMIN = p_srate;
1327 else if (entity_id == USB_OUT_CLK_ID)
1328 r.dMIN = c_srate;
1329 else
1330 return -EOPNOTSUPP;
1331
1332 r.dMAX = r.dMIN;
1333 r.dRES = 0;
1334 r.wNumSubRanges = 1;
1335
1336 value = min_t(unsigned, w_length, sizeof r);
1337 memcpy(req->buf, &r, value);
1338 } else {
1339 dev_err(&uac2->pdev.dev,
1340 "%s:%d control_selector=%d TODO!\n",
1341 __func__, __LINE__, control_selector);
1342 }
1343
1344 return value;
1345}
1346
1347static int
1348ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1349{
1350 if (cr->bRequest == UAC2_CS_CUR)
1351 return in_rq_cur(fn, cr);
1352 else if (cr->bRequest == UAC2_CS_RANGE)
1353 return in_rq_range(fn, cr);
1354 else
1355 return -EOPNOTSUPP;
1356}
1357
1358static int
1359out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1360{
1361 u16 w_length = le16_to_cpu(cr->wLength);
1362 u16 w_value = le16_to_cpu(cr->wValue);
1363 u8 control_selector = w_value >> 8;
1364
1365 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1366 return w_length;
1367
1368 return -EOPNOTSUPP;
1369}
1370
1371static int
1372setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1373{
1374 struct audio_dev *agdev = func_to_agdev(fn);
1375 struct snd_uac2_chip *uac2 = &agdev->uac2;
1376 u16 w_index = le16_to_cpu(cr->wIndex);
1377 u8 intf = w_index & 0xff;
1378
1379 if (intf != agdev->ac_intf) {
1380 dev_err(&uac2->pdev.dev,
1381 "%s:%d Error!\n", __func__, __LINE__);
1382 return -EOPNOTSUPP;
1383 }
1384
1385 if (cr->bRequestType & USB_DIR_IN)
1386 return ac_rq_in(fn, cr);
1387 else if (cr->bRequest == UAC2_CS_CUR)
1388 return out_rq_cur(fn, cr);
1389
1390 return -EOPNOTSUPP;
1391}
1392
1393static int
1394afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1395{
1396 struct usb_composite_dev *cdev = fn->config->cdev;
1397 struct audio_dev *agdev = func_to_agdev(fn);
1398 struct snd_uac2_chip *uac2 = &agdev->uac2;
1399 struct usb_request *req = cdev->req;
1400 u16 w_length = le16_to_cpu(cr->wLength);
1401 int value = -EOPNOTSUPP;
1402
1403 /* Only Class specific requests are supposed to reach here */
1404 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1405 return -EOPNOTSUPP;
1406
1407 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1408 value = setup_rq_inf(fn, cr);
1409 else
1410 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
1411
1412 if (value >= 0) {
1413 req->length = value;
1414 req->zero = value < w_length;
1415 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1416 if (value < 0) {
1417 dev_err(&uac2->pdev.dev,
1418 "%s:%d Error!\n", __func__, __LINE__);
1419 req->status = 0;
1420 }
1421 }
1422
1423 return value;
1424}
1425
1426static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1427{
1428 return container_of(to_config_group(item), struct f_uac2_opts,
1429 func_inst.group);
1430}
1431
1432static void f_uac2_attr_release(struct config_item *item)
1433{
1434 struct f_uac2_opts *opts = to_f_uac2_opts(item);
1435
1436 usb_put_function_instance(&opts->func_inst);
1437}
1438
1439static struct configfs_item_operations f_uac2_item_ops = {
1440 .release = f_uac2_attr_release,
1441};
1442
1443#define UAC2_ATTRIBUTE(name) \
1444static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1445 char *page) \
1446{ \
1447 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1448 int result; \
1449 \
1450 mutex_lock(&opts->lock); \
1451 result = sprintf(page, "%u\n", opts->name); \
1452 mutex_unlock(&opts->lock); \
1453 \
1454 return result; \
1455} \
1456 \
1457static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
1458 const char *page, size_t len) \
1459{ \
1460 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1461 int ret; \
1462 u32 num; \
1463 \
1464 mutex_lock(&opts->lock); \
1465 if (opts->refcnt) { \
1466 ret = -EBUSY; \
1467 goto end; \
1468 } \
1469 \
1470 ret = kstrtou32(page, 0, &num); \
1471 if (ret) \
1472 goto end; \
1473 \
1474 opts->name = num; \
1475 ret = len; \
1476 \
1477end: \
1478 mutex_unlock(&opts->lock); \
1479 return ret; \
1480} \
1481 \
1482CONFIGFS_ATTR(f_uac2_opts_, name)
1483
1484UAC2_ATTRIBUTE(p_chmask);
1485UAC2_ATTRIBUTE(p_srate);
1486UAC2_ATTRIBUTE(p_ssize);
1487UAC2_ATTRIBUTE(c_chmask);
1488UAC2_ATTRIBUTE(c_srate);
1489UAC2_ATTRIBUTE(c_ssize);
1490
1491static struct configfs_attribute *f_uac2_attrs[] = {
1492 &f_uac2_opts_attr_p_chmask,
1493 &f_uac2_opts_attr_p_srate,
1494 &f_uac2_opts_attr_p_ssize,
1495 &f_uac2_opts_attr_c_chmask,
1496 &f_uac2_opts_attr_c_srate,
1497 &f_uac2_opts_attr_c_ssize,
1498 NULL,
1499};
1500
1501static struct config_item_type f_uac2_func_type = {
1502 .ct_item_ops = &f_uac2_item_ops,
1503 .ct_attrs = f_uac2_attrs,
1504 .ct_owner = THIS_MODULE,
1505};
1506
1507static void afunc_free_inst(struct usb_function_instance *f)
1508{
1509 struct f_uac2_opts *opts;
1510
1511 opts = container_of(f, struct f_uac2_opts, func_inst);
1512 kfree(opts);
1513}
1514
1515static struct usb_function_instance *afunc_alloc_inst(void)
1516{
1517 struct f_uac2_opts *opts;
1518
1519 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1520 if (!opts)
1521 return ERR_PTR(-ENOMEM);
1522
1523 mutex_init(&opts->lock);
1524 opts->func_inst.free_func_inst = afunc_free_inst;
1525
1526 config_group_init_type_name(&opts->func_inst.group, "",
1527 &f_uac2_func_type);
1528
1529 opts->p_chmask = UAC2_DEF_PCHMASK;
1530 opts->p_srate = UAC2_DEF_PSRATE;
1531 opts->p_ssize = UAC2_DEF_PSSIZE;
1532 opts->c_chmask = UAC2_DEF_CCHMASK;
1533 opts->c_srate = UAC2_DEF_CSRATE;
1534 opts->c_ssize = UAC2_DEF_CSSIZE;
1535 return &opts->func_inst;
1536}
1537
1538static void afunc_free(struct usb_function *f)
1539{
1540 struct audio_dev *agdev;
1541 struct f_uac2_opts *opts;
1542
1543 agdev = func_to_agdev(f);
1544 opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1545 kfree(agdev);
1546 mutex_lock(&opts->lock);
1547 --opts->refcnt;
1548 mutex_unlock(&opts->lock);
1549}
1550
1551static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1552{
1553 struct audio_dev *agdev = func_to_agdev(f);
1554 struct uac2_rtd_params *prm;
1555
1556 alsa_uac2_exit(agdev);
1557
1558 prm = &agdev->uac2.p_prm;
1559 kfree(prm->rbuf);
1560
1561 prm = &agdev->uac2.c_prm;
1562 kfree(prm->rbuf);
1563 usb_free_all_descriptors(f);
1564}
1565
1566static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1567{
1568 struct audio_dev *agdev;
1569 struct f_uac2_opts *opts;
1570
1571 agdev = kzalloc(sizeof(*agdev), GFP_KERNEL);
1572 if (agdev == NULL)
1573 return ERR_PTR(-ENOMEM);
1574
1575 opts = container_of(fi, struct f_uac2_opts, func_inst);
1576 mutex_lock(&opts->lock);
1577 ++opts->refcnt;
1578 mutex_unlock(&opts->lock);
1579
1580 agdev->func.name = "uac2_func";
1581 agdev->func.bind = afunc_bind;
1582 agdev->func.unbind = afunc_unbind;
1583 agdev->func.set_alt = afunc_set_alt;
1584 agdev->func.get_alt = afunc_get_alt;
1585 agdev->func.disable = afunc_disable;
1586 agdev->func.setup = afunc_setup;
1587 agdev->func.free_func = afunc_free;
1588
1589 return &agdev->func;
1590}
1591
1592DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1593MODULE_LICENSE("GPL");
1594MODULE_AUTHOR("Yadwinder Singh");
1595MODULE_AUTHOR("Jaswinder Singh");