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
57 static const char *uac2_name = "snd_uac2";
58
59 struct uac2_req {
60 struct uac2_rtd_params *pp; /* parent param */
61 struct usb_request *req;
62 };
63
64 struct 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
86 struct 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
110 static 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
121 struct 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
133 static inline
func_to_agdev(struct usb_function * f)134 struct audio_dev *func_to_agdev(struct usb_function *f)
135 {
136 return container_of(f, struct audio_dev, func);
137 }
138
139 static inline
uac2_to_agdev(struct snd_uac2_chip * u)140 struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
141 {
142 return container_of(u, struct audio_dev, uac2);
143 }
144
145 static inline
pdev_to_uac2(struct platform_device * p)146 struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
147 {
148 return container_of(p, struct snd_uac2_chip, pdev);
149 }
150
151 static inline
agdev_to_uac2_opts(struct audio_dev * agdev)152 struct 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
157 static inline
num_channels(uint chanmask)158 uint 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
170 static void
agdev_iso_complete(struct usb_ep * ep,struct usb_request * req)171 agdev_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
258 exit:
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
268 static int
uac2_pcm_trigger(struct snd_pcm_substream * substream,int cmd)269 uac2_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
uac2_pcm_pointer(struct snd_pcm_substream * substream)308 static 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
uac2_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)321 static 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
uac2_pcm_hw_free(struct snd_pcm_substream * substream)344 static 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
uac2_pcm_open(struct snd_pcm_substream * substream)361 static 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 */
uac2_pcm_null(struct snd_pcm_substream * substream)428 static int uac2_pcm_null(struct snd_pcm_substream *substream)
429 {
430 return 0;
431 }
432
433 static 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
snd_uac2_probe(struct platform_device * pdev)444 static 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
496 snd_fail:
497 snd_card_free(card);
498
499 uac2->pcm = NULL;
500 uac2->card = NULL;
501
502 return err;
503 }
504
snd_uac2_remove(struct platform_device * pdev)505 static 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
snd_uac2_release(struct device * dev)515 static void snd_uac2_release(struct device *dev)
516 {
517 dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
518 }
519
alsa_uac2_init(struct audio_dev * agdev)520 static 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
alsa_uac2_exit(struct audio_dev * agdev)546 static 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
557 enum {
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
572 static char clksrc_in[8];
573 static char clksrc_out[8];
574
575 static 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
591 static struct usb_gadget_strings str_fn = {
592 .language = 0x0409, /* en-us */
593 .strings = strings_fn,
594 };
595
596 static struct usb_gadget_strings *fn_strings[] = {
597 &str_fn,
598 NULL,
599 };
600
601 static 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 */
613 static 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 */
625 static 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 */
637 static 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 */
649 static 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 */
663 static 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 */
677 static 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 */
691 static 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
704 static 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 */
718 static 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 */
730 static 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 */
742 static 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 */
755 static 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 */
763 static 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 = DYNAMIC */
770 .bInterval = 1,
771 };
772
773 static 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 = DYNAMIC */
779 .bInterval = 4,
780 };
781
782 /* CS AS ISO OUT Endpoint */
783 static 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 */
795 static 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 */
807 static 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 */
819 static 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 */
832 static 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 */
840 static 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 = DYNAMIC */
847 .bInterval = 1,
848 };
849
850 static 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 = DYNAMIC */
856 .bInterval = 4,
857 };
858
859 /* CS AS ISO IN Endpoint */
860 static 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
871 static 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
901 static 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
931 struct cntrl_cur_lay3 {
932 __le32 dCUR;
933 };
934
935 struct cntrl_range_lay3 {
936 __le16 wNumSubRanges;
937 __le32 dMIN;
938 __le32 dMAX;
939 __le32 dRES;
940 } __packed;
941
942 static inline void
free_ep(struct uac2_rtd_params * prm,struct usb_ep * ep)943 free_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
set_ep_max_packet_size(const struct f_uac2_opts * uac2_opts,struct usb_endpoint_descriptor * ep_desc,enum usb_device_speed speed,bool is_playback)966 static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
967 struct usb_endpoint_descriptor *ep_desc,
968 enum usb_device_speed speed, bool is_playback)
969 {
970 int chmask, srate, ssize;
971 u16 max_size_bw, max_size_ep;
972 unsigned int factor;
973
974 switch (speed) {
975 case USB_SPEED_FULL:
976 max_size_ep = 1023;
977 factor = 1000;
978 break;
979
980 case USB_SPEED_HIGH:
981 max_size_ep = 1024;
982 factor = 8000;
983 break;
984
985 default:
986 return -EINVAL;
987 }
988
989 if (is_playback) {
990 chmask = uac2_opts->p_chmask;
991 srate = uac2_opts->p_srate;
992 ssize = uac2_opts->p_ssize;
993 } else {
994 chmask = uac2_opts->c_chmask;
995 srate = uac2_opts->c_srate;
996 ssize = uac2_opts->c_ssize;
997 }
998
999 max_size_bw = num_channels(chmask) * ssize *
1000 ((srate / (factor / (1 << (ep_desc->bInterval - 1)))) + 1);
1001 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
1002 max_size_ep));
1003
1004 return 0;
1005 }
1006
1007 static int
afunc_bind(struct usb_configuration * cfg,struct usb_function * fn)1008 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
1009 {
1010 struct audio_dev *agdev = func_to_agdev(fn);
1011 struct snd_uac2_chip *uac2 = &agdev->uac2;
1012 struct usb_composite_dev *cdev = cfg->cdev;
1013 struct usb_gadget *gadget = cdev->gadget;
1014 struct device *dev = &uac2->pdev.dev;
1015 struct uac2_rtd_params *prm;
1016 struct f_uac2_opts *uac2_opts;
1017 struct usb_string *us;
1018 int ret;
1019
1020 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
1021
1022 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
1023 if (IS_ERR(us))
1024 return PTR_ERR(us);
1025 iad_desc.iFunction = us[STR_ASSOC].id;
1026 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
1027 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
1028 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
1029 usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
1030 io_in_it_desc.iTerminal = us[STR_IO_IT].id;
1031 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
1032 io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
1033 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
1034 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
1035 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
1036 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
1037
1038
1039 /* Initialize the configurable parameters */
1040 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1041 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1042 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1043 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1044 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1045 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1046 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1047 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1048 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1049 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1050 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1051 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1052
1053 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
1054 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
1055
1056 ret = usb_interface_id(cfg, fn);
1057 if (ret < 0) {
1058 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1059 return ret;
1060 }
1061 iad_desc.bFirstInterface = ret;
1062
1063 std_ac_if_desc.bInterfaceNumber = ret;
1064 agdev->ac_intf = ret;
1065 agdev->ac_alt = 0;
1066
1067 ret = usb_interface_id(cfg, fn);
1068 if (ret < 0) {
1069 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1070 return ret;
1071 }
1072 std_as_out_if0_desc.bInterfaceNumber = ret;
1073 std_as_out_if1_desc.bInterfaceNumber = ret;
1074 agdev->as_out_intf = ret;
1075 agdev->as_out_alt = 0;
1076
1077 ret = usb_interface_id(cfg, fn);
1078 if (ret < 0) {
1079 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1080 return ret;
1081 }
1082 std_as_in_if0_desc.bInterfaceNumber = ret;
1083 std_as_in_if1_desc.bInterfaceNumber = ret;
1084 agdev->as_in_intf = ret;
1085 agdev->as_in_alt = 0;
1086
1087 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1088 if (!agdev->out_ep) {
1089 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1090 return -ENODEV;
1091 }
1092
1093 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1094 if (!agdev->in_ep) {
1095 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1096 return -ENODEV;
1097 }
1098
1099 uac2->p_prm.uac2 = uac2;
1100 uac2->c_prm.uac2 = uac2;
1101
1102 /* Calculate wMaxPacketSize according to audio bandwidth */
1103 ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
1104 true);
1105 if (ret < 0) {
1106 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1107 return ret;
1108 }
1109
1110 ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL,
1111 false);
1112 if (ret < 0) {
1113 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1114 return ret;
1115 }
1116
1117 ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH,
1118 true);
1119 if (ret < 0) {
1120 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1121 return ret;
1122 }
1123
1124 ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH,
1125 false);
1126 if (ret < 0) {
1127 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1128 return ret;
1129 }
1130
1131 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1132 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1133
1134 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL);
1135 if (ret)
1136 return ret;
1137
1138 prm = &agdev->uac2.c_prm;
1139 prm->max_psize = hs_epout_desc.wMaxPacketSize;
1140 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1141 if (!prm->rbuf) {
1142 prm->max_psize = 0;
1143 goto err_free_descs;
1144 }
1145
1146 prm = &agdev->uac2.p_prm;
1147 prm->max_psize = hs_epin_desc.wMaxPacketSize;
1148 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1149 if (!prm->rbuf) {
1150 prm->max_psize = 0;
1151 goto err;
1152 }
1153
1154 ret = alsa_uac2_init(agdev);
1155 if (ret)
1156 goto err;
1157 return 0;
1158
1159 err:
1160 kfree(agdev->uac2.p_prm.rbuf);
1161 kfree(agdev->uac2.c_prm.rbuf);
1162 err_free_descs:
1163 usb_free_all_descriptors(fn);
1164 return -EINVAL;
1165 }
1166
1167 static int
afunc_set_alt(struct usb_function * fn,unsigned intf,unsigned alt)1168 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1169 {
1170 struct usb_composite_dev *cdev = fn->config->cdev;
1171 struct audio_dev *agdev = func_to_agdev(fn);
1172 struct snd_uac2_chip *uac2 = &agdev->uac2;
1173 struct usb_gadget *gadget = cdev->gadget;
1174 struct device *dev = &uac2->pdev.dev;
1175 struct usb_request *req;
1176 struct usb_ep *ep;
1177 struct uac2_rtd_params *prm;
1178 int req_len, i;
1179
1180 /* No i/f has more than 2 alt settings */
1181 if (alt > 1) {
1182 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1183 return -EINVAL;
1184 }
1185
1186 if (intf == agdev->ac_intf) {
1187 /* Control I/f has only 1 AltSetting - 0 */
1188 if (alt) {
1189 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1190 return -EINVAL;
1191 }
1192 return 0;
1193 }
1194
1195 if (intf == agdev->as_out_intf) {
1196 ep = agdev->out_ep;
1197 prm = &uac2->c_prm;
1198 config_ep_by_speed(gadget, fn, ep);
1199 agdev->as_out_alt = alt;
1200 req_len = prm->max_psize;
1201 } else if (intf == agdev->as_in_intf) {
1202 struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
1203 unsigned int factor, rate;
1204 struct usb_endpoint_descriptor *ep_desc;
1205
1206 ep = agdev->in_ep;
1207 prm = &uac2->p_prm;
1208 config_ep_by_speed(gadget, fn, ep);
1209 agdev->as_in_alt = alt;
1210
1211 /* pre-calculate the playback endpoint's interval */
1212 if (gadget->speed == USB_SPEED_FULL) {
1213 ep_desc = &fs_epin_desc;
1214 factor = 1000;
1215 } else {
1216 ep_desc = &hs_epin_desc;
1217 factor = 8000;
1218 }
1219
1220 /* pre-compute some values for iso_complete() */
1221 uac2->p_framesize = opts->p_ssize *
1222 num_channels(opts->p_chmask);
1223 rate = opts->p_srate * uac2->p_framesize;
1224 uac2->p_interval = factor / (1 << (ep_desc->bInterval - 1));
1225 uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
1226 prm->max_psize);
1227
1228 if (uac2->p_pktsize < prm->max_psize)
1229 uac2->p_pktsize_residue = rate % uac2->p_interval;
1230 else
1231 uac2->p_pktsize_residue = 0;
1232
1233 req_len = uac2->p_pktsize;
1234 uac2->p_residue = 0;
1235 } else {
1236 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1237 return -EINVAL;
1238 }
1239
1240 if (alt == 0) {
1241 free_ep(prm, ep);
1242 return 0;
1243 }
1244
1245 prm->ep_enabled = true;
1246 usb_ep_enable(ep);
1247
1248 for (i = 0; i < USB_XFERS; i++) {
1249 if (!prm->ureq[i].req) {
1250 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
1251 if (req == NULL)
1252 return -ENOMEM;
1253
1254 prm->ureq[i].req = req;
1255 prm->ureq[i].pp = prm;
1256
1257 req->zero = 0;
1258 req->context = &prm->ureq[i];
1259 req->length = req_len;
1260 req->complete = agdev_iso_complete;
1261 req->buf = prm->rbuf + i * prm->max_psize;
1262 }
1263
1264 if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
1265 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1266 }
1267
1268 return 0;
1269 }
1270
1271 static int
afunc_get_alt(struct usb_function * fn,unsigned intf)1272 afunc_get_alt(struct usb_function *fn, unsigned intf)
1273 {
1274 struct audio_dev *agdev = func_to_agdev(fn);
1275 struct snd_uac2_chip *uac2 = &agdev->uac2;
1276
1277 if (intf == agdev->ac_intf)
1278 return agdev->ac_alt;
1279 else if (intf == agdev->as_out_intf)
1280 return agdev->as_out_alt;
1281 else if (intf == agdev->as_in_intf)
1282 return agdev->as_in_alt;
1283 else
1284 dev_err(&uac2->pdev.dev,
1285 "%s:%d Invalid Interface %d!\n",
1286 __func__, __LINE__, intf);
1287
1288 return -EINVAL;
1289 }
1290
1291 static void
afunc_disable(struct usb_function * fn)1292 afunc_disable(struct usb_function *fn)
1293 {
1294 struct audio_dev *agdev = func_to_agdev(fn);
1295 struct snd_uac2_chip *uac2 = &agdev->uac2;
1296
1297 free_ep(&uac2->p_prm, agdev->in_ep);
1298 agdev->as_in_alt = 0;
1299
1300 free_ep(&uac2->c_prm, agdev->out_ep);
1301 agdev->as_out_alt = 0;
1302 }
1303
1304 static int
in_rq_cur(struct usb_function * fn,const struct usb_ctrlrequest * cr)1305 in_rq_cur(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 int value = -EOPNOTSUPP;
1317 int p_srate, c_srate;
1318
1319 opts = agdev_to_uac2_opts(agdev);
1320 p_srate = opts->p_srate;
1321 c_srate = opts->c_srate;
1322
1323 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1324 struct cntrl_cur_lay3 c;
1325 memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1326
1327 if (entity_id == USB_IN_CLK_ID)
1328 c.dCUR = cpu_to_le32(p_srate);
1329 else if (entity_id == USB_OUT_CLK_ID)
1330 c.dCUR = cpu_to_le32(c_srate);
1331
1332 value = min_t(unsigned, w_length, sizeof c);
1333 memcpy(req->buf, &c, value);
1334 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1335 *(u8 *)req->buf = 1;
1336 value = min_t(unsigned, w_length, 1);
1337 } else {
1338 dev_err(&uac2->pdev.dev,
1339 "%s:%d control_selector=%d TODO!\n",
1340 __func__, __LINE__, control_selector);
1341 }
1342
1343 return value;
1344 }
1345
1346 static int
in_rq_range(struct usb_function * fn,const struct usb_ctrlrequest * cr)1347 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1348 {
1349 struct usb_request *req = fn->config->cdev->req;
1350 struct audio_dev *agdev = func_to_agdev(fn);
1351 struct snd_uac2_chip *uac2 = &agdev->uac2;
1352 struct f_uac2_opts *opts;
1353 u16 w_length = le16_to_cpu(cr->wLength);
1354 u16 w_index = le16_to_cpu(cr->wIndex);
1355 u16 w_value = le16_to_cpu(cr->wValue);
1356 u8 entity_id = (w_index >> 8) & 0xff;
1357 u8 control_selector = w_value >> 8;
1358 struct cntrl_range_lay3 r;
1359 int value = -EOPNOTSUPP;
1360 int p_srate, c_srate;
1361
1362 opts = agdev_to_uac2_opts(agdev);
1363 p_srate = opts->p_srate;
1364 c_srate = opts->c_srate;
1365
1366 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1367 if (entity_id == USB_IN_CLK_ID)
1368 r.dMIN = cpu_to_le32(p_srate);
1369 else if (entity_id == USB_OUT_CLK_ID)
1370 r.dMIN = cpu_to_le32(c_srate);
1371 else
1372 return -EOPNOTSUPP;
1373
1374 r.dMAX = r.dMIN;
1375 r.dRES = 0;
1376 r.wNumSubRanges = cpu_to_le16(1);
1377
1378 value = min_t(unsigned, w_length, sizeof r);
1379 memcpy(req->buf, &r, value);
1380 } else {
1381 dev_err(&uac2->pdev.dev,
1382 "%s:%d control_selector=%d TODO!\n",
1383 __func__, __LINE__, control_selector);
1384 }
1385
1386 return value;
1387 }
1388
1389 static int
ac_rq_in(struct usb_function * fn,const struct usb_ctrlrequest * cr)1390 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1391 {
1392 if (cr->bRequest == UAC2_CS_CUR)
1393 return in_rq_cur(fn, cr);
1394 else if (cr->bRequest == UAC2_CS_RANGE)
1395 return in_rq_range(fn, cr);
1396 else
1397 return -EOPNOTSUPP;
1398 }
1399
1400 static int
out_rq_cur(struct usb_function * fn,const struct usb_ctrlrequest * cr)1401 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1402 {
1403 u16 w_length = le16_to_cpu(cr->wLength);
1404 u16 w_value = le16_to_cpu(cr->wValue);
1405 u8 control_selector = w_value >> 8;
1406
1407 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1408 return w_length;
1409
1410 return -EOPNOTSUPP;
1411 }
1412
1413 static int
setup_rq_inf(struct usb_function * fn,const struct usb_ctrlrequest * cr)1414 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1415 {
1416 struct audio_dev *agdev = func_to_agdev(fn);
1417 struct snd_uac2_chip *uac2 = &agdev->uac2;
1418 u16 w_index = le16_to_cpu(cr->wIndex);
1419 u8 intf = w_index & 0xff;
1420
1421 if (intf != agdev->ac_intf) {
1422 dev_err(&uac2->pdev.dev,
1423 "%s:%d Error!\n", __func__, __LINE__);
1424 return -EOPNOTSUPP;
1425 }
1426
1427 if (cr->bRequestType & USB_DIR_IN)
1428 return ac_rq_in(fn, cr);
1429 else if (cr->bRequest == UAC2_CS_CUR)
1430 return out_rq_cur(fn, cr);
1431
1432 return -EOPNOTSUPP;
1433 }
1434
1435 static int
afunc_setup(struct usb_function * fn,const struct usb_ctrlrequest * cr)1436 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1437 {
1438 struct usb_composite_dev *cdev = fn->config->cdev;
1439 struct audio_dev *agdev = func_to_agdev(fn);
1440 struct snd_uac2_chip *uac2 = &agdev->uac2;
1441 struct usb_request *req = cdev->req;
1442 u16 w_length = le16_to_cpu(cr->wLength);
1443 int value = -EOPNOTSUPP;
1444
1445 /* Only Class specific requests are supposed to reach here */
1446 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1447 return -EOPNOTSUPP;
1448
1449 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1450 value = setup_rq_inf(fn, cr);
1451 else
1452 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
1453
1454 if (value >= 0) {
1455 req->length = value;
1456 req->zero = value < w_length;
1457 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1458 if (value < 0) {
1459 dev_err(&uac2->pdev.dev,
1460 "%s:%d Error!\n", __func__, __LINE__);
1461 req->status = 0;
1462 }
1463 }
1464
1465 return value;
1466 }
1467
to_f_uac2_opts(struct config_item * item)1468 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1469 {
1470 return container_of(to_config_group(item), struct f_uac2_opts,
1471 func_inst.group);
1472 }
1473
f_uac2_attr_release(struct config_item * item)1474 static void f_uac2_attr_release(struct config_item *item)
1475 {
1476 struct f_uac2_opts *opts = to_f_uac2_opts(item);
1477
1478 usb_put_function_instance(&opts->func_inst);
1479 }
1480
1481 static struct configfs_item_operations f_uac2_item_ops = {
1482 .release = f_uac2_attr_release,
1483 };
1484
1485 #define UAC2_ATTRIBUTE(name) \
1486 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
1487 char *page) \
1488 { \
1489 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1490 int result; \
1491 \
1492 mutex_lock(&opts->lock); \
1493 result = sprintf(page, "%u\n", opts->name); \
1494 mutex_unlock(&opts->lock); \
1495 \
1496 return result; \
1497 } \
1498 \
1499 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
1500 const char *page, size_t len) \
1501 { \
1502 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
1503 int ret; \
1504 u32 num; \
1505 \
1506 mutex_lock(&opts->lock); \
1507 if (opts->refcnt) { \
1508 ret = -EBUSY; \
1509 goto end; \
1510 } \
1511 \
1512 ret = kstrtou32(page, 0, &num); \
1513 if (ret) \
1514 goto end; \
1515 \
1516 opts->name = num; \
1517 ret = len; \
1518 \
1519 end: \
1520 mutex_unlock(&opts->lock); \
1521 return ret; \
1522 } \
1523 \
1524 CONFIGFS_ATTR(f_uac2_opts_, name)
1525
1526 UAC2_ATTRIBUTE(p_chmask);
1527 UAC2_ATTRIBUTE(p_srate);
1528 UAC2_ATTRIBUTE(p_ssize);
1529 UAC2_ATTRIBUTE(c_chmask);
1530 UAC2_ATTRIBUTE(c_srate);
1531 UAC2_ATTRIBUTE(c_ssize);
1532
1533 static struct configfs_attribute *f_uac2_attrs[] = {
1534 &f_uac2_opts_attr_p_chmask,
1535 &f_uac2_opts_attr_p_srate,
1536 &f_uac2_opts_attr_p_ssize,
1537 &f_uac2_opts_attr_c_chmask,
1538 &f_uac2_opts_attr_c_srate,
1539 &f_uac2_opts_attr_c_ssize,
1540 NULL,
1541 };
1542
1543 static struct config_item_type f_uac2_func_type = {
1544 .ct_item_ops = &f_uac2_item_ops,
1545 .ct_attrs = f_uac2_attrs,
1546 .ct_owner = THIS_MODULE,
1547 };
1548
afunc_free_inst(struct usb_function_instance * f)1549 static void afunc_free_inst(struct usb_function_instance *f)
1550 {
1551 struct f_uac2_opts *opts;
1552
1553 opts = container_of(f, struct f_uac2_opts, func_inst);
1554 kfree(opts);
1555 }
1556
afunc_alloc_inst(void)1557 static struct usb_function_instance *afunc_alloc_inst(void)
1558 {
1559 struct f_uac2_opts *opts;
1560
1561 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1562 if (!opts)
1563 return ERR_PTR(-ENOMEM);
1564
1565 mutex_init(&opts->lock);
1566 opts->func_inst.free_func_inst = afunc_free_inst;
1567
1568 config_group_init_type_name(&opts->func_inst.group, "",
1569 &f_uac2_func_type);
1570
1571 opts->p_chmask = UAC2_DEF_PCHMASK;
1572 opts->p_srate = UAC2_DEF_PSRATE;
1573 opts->p_ssize = UAC2_DEF_PSSIZE;
1574 opts->c_chmask = UAC2_DEF_CCHMASK;
1575 opts->c_srate = UAC2_DEF_CSRATE;
1576 opts->c_ssize = UAC2_DEF_CSSIZE;
1577 return &opts->func_inst;
1578 }
1579
afunc_free(struct usb_function * f)1580 static void afunc_free(struct usb_function *f)
1581 {
1582 struct audio_dev *agdev;
1583 struct f_uac2_opts *opts;
1584
1585 agdev = func_to_agdev(f);
1586 opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1587 kfree(agdev);
1588 mutex_lock(&opts->lock);
1589 --opts->refcnt;
1590 mutex_unlock(&opts->lock);
1591 }
1592
afunc_unbind(struct usb_configuration * c,struct usb_function * f)1593 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1594 {
1595 struct audio_dev *agdev = func_to_agdev(f);
1596 struct uac2_rtd_params *prm;
1597
1598 alsa_uac2_exit(agdev);
1599
1600 prm = &agdev->uac2.p_prm;
1601 kfree(prm->rbuf);
1602
1603 prm = &agdev->uac2.c_prm;
1604 kfree(prm->rbuf);
1605 usb_free_all_descriptors(f);
1606 }
1607
afunc_alloc(struct usb_function_instance * fi)1608 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1609 {
1610 struct audio_dev *agdev;
1611 struct f_uac2_opts *opts;
1612
1613 agdev = kzalloc(sizeof(*agdev), GFP_KERNEL);
1614 if (agdev == NULL)
1615 return ERR_PTR(-ENOMEM);
1616
1617 opts = container_of(fi, struct f_uac2_opts, func_inst);
1618 mutex_lock(&opts->lock);
1619 ++opts->refcnt;
1620 mutex_unlock(&opts->lock);
1621
1622 agdev->func.name = "uac2_func";
1623 agdev->func.bind = afunc_bind;
1624 agdev->func.unbind = afunc_unbind;
1625 agdev->func.set_alt = afunc_set_alt;
1626 agdev->func.get_alt = afunc_get_alt;
1627 agdev->func.disable = afunc_disable;
1628 agdev->func.setup = afunc_setup;
1629 agdev->func.free_func = afunc_free;
1630
1631 return &agdev->func;
1632 }
1633
1634 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1635 MODULE_LICENSE("GPL");
1636 MODULE_AUTHOR("Yadwinder Singh");
1637 MODULE_AUTHOR("Jaswinder Singh");
1638