1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * US-X2Y AUDIO
4 * Copyright (c) 2002-2004 by Karsten Wiese
5 *
6 * based on
7 *
8 * (Tentative) USB Audio Driver for ALSA
9 *
10 * Main and PCM part
11 *
12 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
13 *
14 * Many codes borrowed from audio.c by
15 * Alan Cox (alan@lxorguk.ukuu.org.uk)
16 * Thomas Sailer (sailer@ife.ee.ethz.ch)
17 */
18
19
20#include <linux/interrupt.h>
21#include <linux/slab.h>
22#include <linux/usb.h>
23#include <linux/moduleparam.h>
24#include <sound/core.h>
25#include <sound/info.h>
26#include <sound/pcm.h>
27#include <sound/pcm_params.h>
28#include "usx2y.h"
29#include "usbusx2y.h"
30
31/* Default value used for nr of packs per urb.
32 * 1 to 4 have been tested ok on uhci.
33 * To use 3 on ohci, you'd need a patch:
34 * look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
35 * "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
36 *
37 * 1, 2 and 4 work out of the box on ohci, if I recall correctly.
38 * Bigger is safer operation, smaller gives lower latencies.
39 */
40#define USX2Y_NRPACKS 4
41
42/* If your system works ok with this module's parameter
43 * nrpacks set to 1, you might as well comment
44 * this define out, and thereby produce smaller, faster code.
45 * You'd also set USX2Y_NRPACKS to 1 then.
46 */
47#define USX2Y_NRPACKS_VARIABLE 1
48
49#ifdef USX2Y_NRPACKS_VARIABLE
50static int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
51#define nr_of_packs() nrpacks
52module_param(nrpacks, int, 0444);
53MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
54#else
55#define nr_of_packs() USX2Y_NRPACKS
56#endif
57
58static int usx2y_urb_capt_retire(struct snd_usx2y_substream *subs)
59{
60 struct urb *urb = subs->completed_urb;
61 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
62 unsigned char *cp;
63 int i, len, lens = 0, hwptr_done = subs->hwptr_done;
64 int cnt, blen;
65 struct usx2ydev *usx2y = subs->usx2y;
66
67 for (i = 0; i < nr_of_packs(); i++) {
68 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
69 if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
70 snd_printk(KERN_ERR
71 "active frame status %i. Most probably some hardware problem.\n",
72 urb->iso_frame_desc[i].status);
73 return urb->iso_frame_desc[i].status;
74 }
75 len = urb->iso_frame_desc[i].actual_length / usx2y->stride;
76 if (!len) {
77 snd_printd("0 == len ERROR!\n");
78 continue;
79 }
80
81 /* copy a data chunk */
82 if ((hwptr_done + len) > runtime->buffer_size) {
83 cnt = runtime->buffer_size - hwptr_done;
84 blen = cnt * usx2y->stride;
85 memcpy(runtime->dma_area + hwptr_done * usx2y->stride, cp, blen);
86 memcpy(runtime->dma_area, cp + blen, len * usx2y->stride - blen);
87 } else {
88 memcpy(runtime->dma_area + hwptr_done * usx2y->stride, cp,
89 len * usx2y->stride);
90 }
91 lens += len;
92 hwptr_done += len;
93 if (hwptr_done >= runtime->buffer_size)
94 hwptr_done -= runtime->buffer_size;
95 }
96
97 subs->hwptr_done = hwptr_done;
98 subs->transfer_done += lens;
99 /* update the pointer, call callback if necessary */
100 if (subs->transfer_done >= runtime->period_size) {
101 subs->transfer_done -= runtime->period_size;
102 snd_pcm_period_elapsed(substream: subs->pcm_substream);
103 }
104 return 0;
105}
106
107/*
108 * prepare urb for playback data pipe
109 *
110 * we copy the data directly from the pcm buffer.
111 * the current position to be copied is held in hwptr field.
112 * since a urb can handle only a single linear buffer, if the total
113 * transferred area overflows the buffer boundary, we cannot send
114 * it directly from the buffer. thus the data is once copied to
115 * a temporary buffer and urb points to that.
116 */
117static int usx2y_urb_play_prepare(struct snd_usx2y_substream *subs,
118 struct urb *cap_urb,
119 struct urb *urb)
120{
121 struct usx2ydev *usx2y = subs->usx2y;
122 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
123 int count, counts, pack, len;
124
125 count = 0;
126 for (pack = 0; pack < nr_of_packs(); pack++) {
127 /* calculate the size of a packet */
128 counts = cap_urb->iso_frame_desc[pack].actual_length / usx2y->stride;
129 count += counts;
130 if (counts < 43 || counts > 50) {
131 snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
132 return -EPIPE;
133 }
134 /* set up descriptor */
135 urb->iso_frame_desc[pack].offset = pack ?
136 urb->iso_frame_desc[pack - 1].offset +
137 urb->iso_frame_desc[pack - 1].length :
138 0;
139 urb->iso_frame_desc[pack].length = cap_urb->iso_frame_desc[pack].actual_length;
140 }
141 if (atomic_read(v: &subs->state) >= STATE_PRERUNNING) {
142 if (subs->hwptr + count > runtime->buffer_size) {
143 /* err, the transferred area goes over buffer boundary.
144 * copy the data to the temp buffer.
145 */
146 len = runtime->buffer_size - subs->hwptr;
147 urb->transfer_buffer = subs->tmpbuf;
148 memcpy(subs->tmpbuf, runtime->dma_area +
149 subs->hwptr * usx2y->stride, len * usx2y->stride);
150 memcpy(subs->tmpbuf + len * usx2y->stride,
151 runtime->dma_area, (count - len) * usx2y->stride);
152 subs->hwptr += count;
153 subs->hwptr -= runtime->buffer_size;
154 } else {
155 /* set the buffer pointer */
156 urb->transfer_buffer = runtime->dma_area + subs->hwptr * usx2y->stride;
157 subs->hwptr += count;
158 if (subs->hwptr >= runtime->buffer_size)
159 subs->hwptr -= runtime->buffer_size;
160 }
161 } else {
162 urb->transfer_buffer = subs->tmpbuf;
163 }
164 urb->transfer_buffer_length = count * usx2y->stride;
165 return 0;
166}
167
168/*
169 * process after playback data complete
170 *
171 * update the current position and call callback if a period is processed.
172 */
173static void usx2y_urb_play_retire(struct snd_usx2y_substream *subs, struct urb *urb)
174{
175 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
176 int len = urb->actual_length / subs->usx2y->stride;
177
178 subs->transfer_done += len;
179 subs->hwptr_done += len;
180 if (subs->hwptr_done >= runtime->buffer_size)
181 subs->hwptr_done -= runtime->buffer_size;
182 if (subs->transfer_done >= runtime->period_size) {
183 subs->transfer_done -= runtime->period_size;
184 snd_pcm_period_elapsed(substream: subs->pcm_substream);
185 }
186}
187
188static int usx2y_urb_submit(struct snd_usx2y_substream *subs, struct urb *urb, int frame)
189{
190 int err;
191
192 if (!urb)
193 return -ENODEV;
194 urb->start_frame = frame + NRURBS * nr_of_packs(); // let hcd do rollover sanity checks
195 urb->hcpriv = NULL;
196 urb->dev = subs->usx2y->dev; /* we need to set this at each time */
197 err = usb_submit_urb(urb, GFP_ATOMIC);
198 if (err < 0) {
199 snd_printk(KERN_ERR "usb_submit_urb() returned %i\n", err);
200 return err;
201 }
202 return 0;
203}
204
205static int usx2y_usbframe_complete(struct snd_usx2y_substream *capsubs,
206 struct snd_usx2y_substream *playbacksubs,
207 int frame)
208{
209 int err, state;
210 struct urb *urb = playbacksubs->completed_urb;
211
212 state = atomic_read(v: &playbacksubs->state);
213 if (urb) {
214 if (state == STATE_RUNNING)
215 usx2y_urb_play_retire(subs: playbacksubs, urb);
216 else if (state >= STATE_PRERUNNING)
217 atomic_inc(v: &playbacksubs->state);
218 } else {
219 switch (state) {
220 case STATE_STARTING1:
221 urb = playbacksubs->urb[0];
222 atomic_inc(v: &playbacksubs->state);
223 break;
224 case STATE_STARTING2:
225 urb = playbacksubs->urb[1];
226 atomic_inc(v: &playbacksubs->state);
227 break;
228 }
229 }
230 if (urb) {
231 err = usx2y_urb_play_prepare(subs: playbacksubs, cap_urb: capsubs->completed_urb, urb);
232 if (err)
233 return err;
234 err = usx2y_urb_submit(subs: playbacksubs, urb, frame);
235 if (err)
236 return err;
237 }
238
239 playbacksubs->completed_urb = NULL;
240
241 state = atomic_read(v: &capsubs->state);
242 if (state >= STATE_PREPARED) {
243 if (state == STATE_RUNNING) {
244 err = usx2y_urb_capt_retire(subs: capsubs);
245 if (err)
246 return err;
247 } else if (state >= STATE_PRERUNNING) {
248 atomic_inc(v: &capsubs->state);
249 }
250 err = usx2y_urb_submit(subs: capsubs, urb: capsubs->completed_urb, frame);
251 if (err)
252 return err;
253 }
254 capsubs->completed_urb = NULL;
255 return 0;
256}
257
258static void usx2y_clients_stop(struct usx2ydev *usx2y)
259{
260 struct snd_usx2y_substream *subs;
261 struct urb *urb;
262 int s, u;
263
264 for (s = 0; s < 4; s++) {
265 subs = usx2y->subs[s];
266 if (subs) {
267 snd_printdd("%i %p state=%i\n", s, subs, atomic_read(&subs->state));
268 atomic_set(v: &subs->state, STATE_STOPPED);
269 }
270 }
271 for (s = 0; s < 4; s++) {
272 subs = usx2y->subs[s];
273 if (subs) {
274 if (atomic_read(v: &subs->state) >= STATE_PRERUNNING)
275 snd_pcm_stop_xrun(substream: subs->pcm_substream);
276 for (u = 0; u < NRURBS; u++) {
277 urb = subs->urb[u];
278 if (urb)
279 snd_printdd("%i status=%i start_frame=%i\n",
280 u, urb->status, urb->start_frame);
281 }
282 }
283 }
284 usx2y->prepare_subs = NULL;
285 wake_up(&usx2y->prepare_wait_queue);
286}
287
288static void usx2y_error_urb_status(struct usx2ydev *usx2y,
289 struct snd_usx2y_substream *subs, struct urb *urb)
290{
291 snd_printk(KERN_ERR "ep=%i stalled with status=%i\n", subs->endpoint, urb->status);
292 urb->status = 0;
293 usx2y_clients_stop(usx2y);
294}
295
296static void i_usx2y_urb_complete(struct urb *urb)
297{
298 struct snd_usx2y_substream *subs = urb->context;
299 struct usx2ydev *usx2y = subs->usx2y;
300 struct snd_usx2y_substream *capsubs, *playbacksubs;
301
302 if (unlikely(atomic_read(&subs->state) < STATE_PREPARED)) {
303 snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
304 usb_get_current_frame_number(usx2y->dev),
305 subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
306 urb->status, urb->start_frame);
307 return;
308 }
309 if (unlikely(urb->status)) {
310 usx2y_error_urb_status(usx2y, subs, urb);
311 return;
312 }
313
314 subs->completed_urb = urb;
315
316 capsubs = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
317 playbacksubs = usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
318
319 if (capsubs->completed_urb &&
320 atomic_read(v: &capsubs->state) >= STATE_PREPARED &&
321 (playbacksubs->completed_urb ||
322 atomic_read(v: &playbacksubs->state) < STATE_PREPARED)) {
323 if (!usx2y_usbframe_complete(capsubs, playbacksubs, frame: urb->start_frame)) {
324 usx2y->wait_iso_frame += nr_of_packs();
325 } else {
326 snd_printdd("\n");
327 usx2y_clients_stop(usx2y);
328 }
329 }
330}
331
332static void usx2y_urbs_set_complete(struct usx2ydev *usx2y,
333 void (*complete)(struct urb *))
334{
335 struct snd_usx2y_substream *subs;
336 struct urb *urb;
337 int s, u;
338
339 for (s = 0; s < 4; s++) {
340 subs = usx2y->subs[s];
341 if (subs) {
342 for (u = 0; u < NRURBS; u++) {
343 urb = subs->urb[u];
344 if (urb)
345 urb->complete = complete;
346 }
347 }
348 }
349}
350
351static void usx2y_subs_startup_finish(struct usx2ydev *usx2y)
352{
353 usx2y_urbs_set_complete(usx2y, complete: i_usx2y_urb_complete);
354 usx2y->prepare_subs = NULL;
355}
356
357static void i_usx2y_subs_startup(struct urb *urb)
358{
359 struct snd_usx2y_substream *subs = urb->context;
360 struct usx2ydev *usx2y = subs->usx2y;
361 struct snd_usx2y_substream *prepare_subs = usx2y->prepare_subs;
362
363 if (prepare_subs) {
364 if (urb->start_frame == prepare_subs->urb[0]->start_frame) {
365 usx2y_subs_startup_finish(usx2y);
366 atomic_inc(v: &prepare_subs->state);
367 wake_up(&usx2y->prepare_wait_queue);
368 }
369 }
370
371 i_usx2y_urb_complete(urb);
372}
373
374static void usx2y_subs_prepare(struct snd_usx2y_substream *subs)
375{
376 snd_printdd("usx2y_substream_prepare(%p) ep=%i urb0=%p urb1=%p\n",
377 subs, subs->endpoint, subs->urb[0], subs->urb[1]);
378 /* reset the pointer */
379 subs->hwptr = 0;
380 subs->hwptr_done = 0;
381 subs->transfer_done = 0;
382}
383
384static void usx2y_urb_release(struct urb **urb, int free_tb)
385{
386 if (*urb) {
387 usb_kill_urb(urb: *urb);
388 if (free_tb)
389 kfree(objp: (*urb)->transfer_buffer);
390 usb_free_urb(urb: *urb);
391 *urb = NULL;
392 }
393}
394
395/*
396 * release a substreams urbs
397 */
398static void usx2y_urbs_release(struct snd_usx2y_substream *subs)
399{
400 int i;
401
402 snd_printdd("%s %i\n", __func__, subs->endpoint);
403 for (i = 0; i < NRURBS; i++)
404 usx2y_urb_release(urb: subs->urb + i,
405 free_tb: subs != subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK]);
406
407 kfree(objp: subs->tmpbuf);
408 subs->tmpbuf = NULL;
409}
410
411/*
412 * initialize a substream's urbs
413 */
414static int usx2y_urbs_allocate(struct snd_usx2y_substream *subs)
415{
416 int i;
417 unsigned int pipe;
418 int is_playback = subs == subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
419 struct usb_device *dev = subs->usx2y->dev;
420 struct urb **purb;
421
422 pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
423 usb_rcvisocpipe(dev, subs->endpoint);
424 subs->maxpacksize = usb_maxpacket(udev: dev, pipe);
425 if (!subs->maxpacksize)
426 return -EINVAL;
427
428 if (is_playback && !subs->tmpbuf) { /* allocate a temporary buffer for playback */
429 subs->tmpbuf = kcalloc(nr_of_packs(), size: subs->maxpacksize, GFP_KERNEL);
430 if (!subs->tmpbuf)
431 return -ENOMEM;
432 }
433 /* allocate and initialize data urbs */
434 for (i = 0; i < NRURBS; i++) {
435 purb = subs->urb + i;
436 if (*purb) {
437 usb_kill_urb(urb: *purb);
438 continue;
439 }
440 *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
441 if (!*purb) {
442 usx2y_urbs_release(subs);
443 return -ENOMEM;
444 }
445 if (!is_playback && !(*purb)->transfer_buffer) {
446 /* allocate a capture buffer per urb */
447 (*purb)->transfer_buffer =
448 kmalloc_array(n: subs->maxpacksize,
449 nr_of_packs(), GFP_KERNEL);
450 if (!(*purb)->transfer_buffer) {
451 usx2y_urbs_release(subs);
452 return -ENOMEM;
453 }
454 }
455 (*purb)->dev = dev;
456 (*purb)->pipe = pipe;
457 (*purb)->number_of_packets = nr_of_packs();
458 (*purb)->context = subs;
459 (*purb)->interval = 1;
460 (*purb)->complete = i_usx2y_subs_startup;
461 }
462 return 0;
463}
464
465static void usx2y_subs_startup(struct snd_usx2y_substream *subs)
466{
467 struct usx2ydev *usx2y = subs->usx2y;
468
469 usx2y->prepare_subs = subs;
470 subs->urb[0]->start_frame = -1;
471 wmb();
472 usx2y_urbs_set_complete(usx2y, complete: i_usx2y_subs_startup);
473}
474
475static int usx2y_urbs_start(struct snd_usx2y_substream *subs)
476{
477 int i, err;
478 struct usx2ydev *usx2y = subs->usx2y;
479 struct urb *urb;
480 unsigned long pack;
481
482 err = usx2y_urbs_allocate(subs);
483 if (err < 0)
484 return err;
485 subs->completed_urb = NULL;
486 for (i = 0; i < 4; i++) {
487 struct snd_usx2y_substream *subs = usx2y->subs[i];
488
489 if (subs && atomic_read(v: &subs->state) >= STATE_PREPARED)
490 goto start;
491 }
492
493 start:
494 usx2y_subs_startup(subs);
495 for (i = 0; i < NRURBS; i++) {
496 urb = subs->urb[i];
497 if (usb_pipein(urb->pipe)) {
498 if (!i)
499 atomic_set(v: &subs->state, STATE_STARTING3);
500 urb->dev = usx2y->dev;
501 for (pack = 0; pack < nr_of_packs(); pack++) {
502 urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
503 urb->iso_frame_desc[pack].length = subs->maxpacksize;
504 }
505 urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs();
506 err = usb_submit_urb(urb, GFP_ATOMIC);
507 if (err < 0) {
508 snd_printk(KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
509 err = -EPIPE;
510 goto cleanup;
511 } else {
512 if (!i)
513 usx2y->wait_iso_frame = urb->start_frame;
514 }
515 urb->transfer_flags = 0;
516 } else {
517 atomic_set(v: &subs->state, STATE_STARTING1);
518 break;
519 }
520 }
521 err = 0;
522 wait_event(usx2y->prepare_wait_queue, !usx2y->prepare_subs);
523 if (atomic_read(v: &subs->state) != STATE_PREPARED)
524 err = -EPIPE;
525
526 cleanup:
527 if (err) {
528 usx2y_subs_startup_finish(usx2y);
529 usx2y_clients_stop(usx2y); // something is completely wrong > stop everything
530 }
531 return err;
532}
533
534/*
535 * return the current pcm pointer. just return the hwptr_done value.
536 */
537static snd_pcm_uframes_t snd_usx2y_pcm_pointer(struct snd_pcm_substream *substream)
538{
539 struct snd_usx2y_substream *subs = substream->runtime->private_data;
540
541 return subs->hwptr_done;
542}
543
544/*
545 * start/stop substream
546 */
547static int snd_usx2y_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
548{
549 struct snd_usx2y_substream *subs = substream->runtime->private_data;
550
551 switch (cmd) {
552 case SNDRV_PCM_TRIGGER_START:
553 snd_printdd("%s(START)\n", __func__);
554 if (atomic_read(v: &subs->state) == STATE_PREPARED &&
555 atomic_read(v: &subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]->state) >= STATE_PREPARED) {
556 atomic_set(v: &subs->state, STATE_PRERUNNING);
557 } else {
558 snd_printdd("\n");
559 return -EPIPE;
560 }
561 break;
562 case SNDRV_PCM_TRIGGER_STOP:
563 snd_printdd("%s(STOP)\n", __func__);
564 if (atomic_read(v: &subs->state) >= STATE_PRERUNNING)
565 atomic_set(v: &subs->state, STATE_PREPARED);
566 break;
567 default:
568 return -EINVAL;
569 }
570 return 0;
571}
572
573/*
574 * allocate a buffer, setup samplerate
575 *
576 * so far we use a physically linear buffer although packetize transfer
577 * doesn't need a continuous area.
578 * if sg buffer is supported on the later version of alsa, we'll follow
579 * that.
580 */
581struct s_c2 {
582 char c1, c2;
583};
584
585static const struct s_c2 setrate_44100[] = {
586 { 0x14, 0x08}, // this line sets 44100, well actually a little less
587 { 0x18, 0x40}, // only tascam / frontier design knows the further lines .......
588 { 0x18, 0x42},
589 { 0x18, 0x45},
590 { 0x18, 0x46},
591 { 0x18, 0x48},
592 { 0x18, 0x4A},
593 { 0x18, 0x4C},
594 { 0x18, 0x4E},
595 { 0x18, 0x50},
596 { 0x18, 0x52},
597 { 0x18, 0x54},
598 { 0x18, 0x56},
599 { 0x18, 0x58},
600 { 0x18, 0x5A},
601 { 0x18, 0x5C},
602 { 0x18, 0x5E},
603 { 0x18, 0x60},
604 { 0x18, 0x62},
605 { 0x18, 0x64},
606 { 0x18, 0x66},
607 { 0x18, 0x68},
608 { 0x18, 0x6A},
609 { 0x18, 0x6C},
610 { 0x18, 0x6E},
611 { 0x18, 0x70},
612 { 0x18, 0x72},
613 { 0x18, 0x74},
614 { 0x18, 0x76},
615 { 0x18, 0x78},
616 { 0x18, 0x7A},
617 { 0x18, 0x7C},
618 { 0x18, 0x7E}
619};
620
621static const struct s_c2 setrate_48000[] = {
622 { 0x14, 0x09}, // this line sets 48000, well actually a little less
623 { 0x18, 0x40}, // only tascam / frontier design knows the further lines .......
624 { 0x18, 0x42},
625 { 0x18, 0x45},
626 { 0x18, 0x46},
627 { 0x18, 0x48},
628 { 0x18, 0x4A},
629 { 0x18, 0x4C},
630 { 0x18, 0x4E},
631 { 0x18, 0x50},
632 { 0x18, 0x52},
633 { 0x18, 0x54},
634 { 0x18, 0x56},
635 { 0x18, 0x58},
636 { 0x18, 0x5A},
637 { 0x18, 0x5C},
638 { 0x18, 0x5E},
639 { 0x18, 0x60},
640 { 0x18, 0x62},
641 { 0x18, 0x64},
642 { 0x18, 0x66},
643 { 0x18, 0x68},
644 { 0x18, 0x6A},
645 { 0x18, 0x6C},
646 { 0x18, 0x6E},
647 { 0x18, 0x70},
648 { 0x18, 0x73},
649 { 0x18, 0x74},
650 { 0x18, 0x76},
651 { 0x18, 0x78},
652 { 0x18, 0x7A},
653 { 0x18, 0x7C},
654 { 0x18, 0x7E}
655};
656
657#define NOOF_SETRATE_URBS ARRAY_SIZE(setrate_48000)
658
659static void i_usx2y_04int(struct urb *urb)
660{
661 struct usx2ydev *usx2y = urb->context;
662
663 if (urb->status)
664 snd_printk(KERN_ERR "snd_usx2y_04int() urb->status=%i\n", urb->status);
665 if (!--usx2y->us04->len)
666 wake_up(&usx2y->in04_wait_queue);
667}
668
669static int usx2y_rate_set(struct usx2ydev *usx2y, int rate)
670{
671 int err = 0, i;
672 struct snd_usx2y_urb_seq *us = NULL;
673 int *usbdata = NULL;
674 const struct s_c2 *ra = rate == 48000 ? setrate_48000 : setrate_44100;
675 struct urb *urb;
676
677 if (usx2y->rate != rate) {
678 us = kzalloc(struct_size(us, urb, NOOF_SETRATE_URBS),
679 GFP_KERNEL);
680 if (!us) {
681 err = -ENOMEM;
682 goto cleanup;
683 }
684 us->len = NOOF_SETRATE_URBS;
685 usbdata = kmalloc_array(NOOF_SETRATE_URBS, size: sizeof(int),
686 GFP_KERNEL);
687 if (!usbdata) {
688 err = -ENOMEM;
689 goto cleanup;
690 }
691 for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
692 us->urb[i] = usb_alloc_urb(iso_packets: 0, GFP_KERNEL);
693 if (!us->urb[i]) {
694 err = -ENOMEM;
695 goto cleanup;
696 }
697 ((char *)(usbdata + i))[0] = ra[i].c1;
698 ((char *)(usbdata + i))[1] = ra[i].c2;
699 usb_fill_bulk_urb(urb: us->urb[i], dev: usx2y->dev, usb_sndbulkpipe(usx2y->dev, 4),
700 transfer_buffer: usbdata + i, buffer_length: 2, complete_fn: i_usx2y_04int, context: usx2y);
701 }
702 err = usb_urb_ep_type_check(urb: us->urb[0]);
703 if (err < 0)
704 goto cleanup;
705 us->submitted = 0;
706 usx2y->us04 = us;
707 wait_event_timeout(usx2y->in04_wait_queue, !us->len, HZ);
708 usx2y->us04 = NULL;
709 if (us->len)
710 err = -ENODEV;
711 cleanup:
712 if (us) {
713 us->submitted = 2*NOOF_SETRATE_URBS;
714 for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
715 urb = us->urb[i];
716 if (!urb)
717 continue;
718 if (urb->status) {
719 if (!err)
720 err = -ENODEV;
721 usb_kill_urb(urb);
722 }
723 usb_free_urb(urb);
724 }
725 usx2y->us04 = NULL;
726 kfree(objp: usbdata);
727 kfree(objp: us);
728 if (!err)
729 usx2y->rate = rate;
730 }
731 }
732
733 return err;
734}
735
736static int usx2y_format_set(struct usx2ydev *usx2y, snd_pcm_format_t format)
737{
738 int alternate, err;
739 struct list_head *p;
740
741 if (format == SNDRV_PCM_FORMAT_S24_3LE) {
742 alternate = 2;
743 usx2y->stride = 6;
744 } else {
745 alternate = 1;
746 usx2y->stride = 4;
747 }
748 list_for_each(p, &usx2y->midi_list) {
749 snd_usbmidi_input_stop(p);
750 }
751 usb_kill_urb(urb: usx2y->in04_urb);
752 err = usb_set_interface(dev: usx2y->dev, ifnum: 0, alternate);
753 if (err) {
754 snd_printk(KERN_ERR "usb_set_interface error\n");
755 return err;
756 }
757 usx2y->in04_urb->dev = usx2y->dev;
758 err = usb_submit_urb(urb: usx2y->in04_urb, GFP_KERNEL);
759 list_for_each(p, &usx2y->midi_list) {
760 snd_usbmidi_input_start(p);
761 }
762 usx2y->format = format;
763 usx2y->rate = 0;
764 return err;
765}
766
767
768static int snd_usx2y_pcm_hw_params(struct snd_pcm_substream *substream,
769 struct snd_pcm_hw_params *hw_params)
770{
771 int err = 0;
772 unsigned int rate = params_rate(p: hw_params);
773 snd_pcm_format_t format = params_format(p: hw_params);
774 struct snd_card *card = substream->pstr->pcm->card;
775 struct usx2ydev *dev = usx2y(card);
776 struct snd_usx2y_substream *subs;
777 struct snd_pcm_substream *test_substream;
778 int i;
779
780 mutex_lock(&usx2y(card)->pcm_mutex);
781 snd_printdd("snd_usx2y_hw_params(%p, %p)\n", substream, hw_params);
782 /* all pcm substreams off one usx2y have to operate at the same
783 * rate & format
784 */
785 for (i = 0; i < dev->pcm_devs * 2; i++) {
786 subs = dev->subs[i];
787 if (!subs)
788 continue;
789 test_substream = subs->pcm_substream;
790 if (!test_substream || test_substream == substream ||
791 !test_substream->runtime)
792 continue;
793 if ((test_substream->runtime->format &&
794 test_substream->runtime->format != format) ||
795 (test_substream->runtime->rate &&
796 test_substream->runtime->rate != rate)) {
797 err = -EINVAL;
798 goto error;
799 }
800 }
801
802 error:
803 mutex_unlock(lock: &usx2y(card)->pcm_mutex);
804 return err;
805}
806
807/*
808 * free the buffer
809 */
810static int snd_usx2y_pcm_hw_free(struct snd_pcm_substream *substream)
811{
812 struct snd_pcm_runtime *runtime = substream->runtime;
813 struct snd_usx2y_substream *subs = runtime->private_data;
814 struct snd_usx2y_substream *cap_subs, *playback_subs;
815
816 mutex_lock(&subs->usx2y->pcm_mutex);
817 snd_printdd("snd_usx2y_hw_free(%p)\n", substream);
818
819 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
820 cap_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
821 atomic_set(v: &subs->state, STATE_STOPPED);
822 usx2y_urbs_release(subs);
823 if (!cap_subs->pcm_substream ||
824 !cap_subs->pcm_substream->runtime ||
825 cap_subs->pcm_substream->runtime->state < SNDRV_PCM_STATE_PREPARED) {
826 atomic_set(v: &cap_subs->state, STATE_STOPPED);
827 usx2y_urbs_release(subs: cap_subs);
828 }
829 } else {
830 playback_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
831 if (atomic_read(v: &playback_subs->state) < STATE_PREPARED) {
832 atomic_set(v: &subs->state, STATE_STOPPED);
833 usx2y_urbs_release(subs);
834 }
835 }
836 mutex_unlock(lock: &subs->usx2y->pcm_mutex);
837 return 0;
838}
839
840/*
841 * prepare callback
842 *
843 * set format and initialize urbs
844 */
845static int snd_usx2y_pcm_prepare(struct snd_pcm_substream *substream)
846{
847 struct snd_pcm_runtime *runtime = substream->runtime;
848 struct snd_usx2y_substream *subs = runtime->private_data;
849 struct usx2ydev *usx2y = subs->usx2y;
850 struct snd_usx2y_substream *capsubs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
851 int err = 0;
852
853 snd_printdd("%s(%p)\n", __func__, substream);
854
855 mutex_lock(&usx2y->pcm_mutex);
856 usx2y_subs_prepare(subs);
857 // Start hardware streams
858 // SyncStream first....
859 if (atomic_read(v: &capsubs->state) < STATE_PREPARED) {
860 if (usx2y->format != runtime->format) {
861 err = usx2y_format_set(usx2y, format: runtime->format);
862 if (err < 0)
863 goto up_prepare_mutex;
864 }
865 if (usx2y->rate != runtime->rate) {
866 err = usx2y_rate_set(usx2y, rate: runtime->rate);
867 if (err < 0)
868 goto up_prepare_mutex;
869 }
870 snd_printdd("starting capture pipe for %s\n", subs == capsubs ? "self" : "playpipe");
871 err = usx2y_urbs_start(subs: capsubs);
872 if (err < 0)
873 goto up_prepare_mutex;
874 }
875
876 if (subs != capsubs && atomic_read(v: &subs->state) < STATE_PREPARED)
877 err = usx2y_urbs_start(subs);
878
879 up_prepare_mutex:
880 mutex_unlock(lock: &usx2y->pcm_mutex);
881 return err;
882}
883
884static const struct snd_pcm_hardware snd_usx2y_2c = {
885 .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
886 SNDRV_PCM_INFO_BLOCK_TRANSFER |
887 SNDRV_PCM_INFO_MMAP_VALID |
888 SNDRV_PCM_INFO_BATCH),
889 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
890 .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
891 .rate_min = 44100,
892 .rate_max = 48000,
893 .channels_min = 2,
894 .channels_max = 2,
895 .buffer_bytes_max = (2*128*1024),
896 .period_bytes_min = 64,
897 .period_bytes_max = (128*1024),
898 .periods_min = 2,
899 .periods_max = 1024,
900 .fifo_size = 0
901};
902
903static int snd_usx2y_pcm_open(struct snd_pcm_substream *substream)
904{
905 struct snd_usx2y_substream *subs =
906 ((struct snd_usx2y_substream **)
907 snd_pcm_substream_chip(substream))[substream->stream];
908 struct snd_pcm_runtime *runtime = substream->runtime;
909
910 if (subs->usx2y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)
911 return -EBUSY;
912
913 runtime->hw = snd_usx2y_2c;
914 runtime->private_data = subs;
915 subs->pcm_substream = substream;
916 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, min: 1000, max: 200000);
917 return 0;
918}
919
920static int snd_usx2y_pcm_close(struct snd_pcm_substream *substream)
921{
922 struct snd_pcm_runtime *runtime = substream->runtime;
923 struct snd_usx2y_substream *subs = runtime->private_data;
924
925 subs->pcm_substream = NULL;
926
927 return 0;
928}
929
930static const struct snd_pcm_ops snd_usx2y_pcm_ops = {
931 .open = snd_usx2y_pcm_open,
932 .close = snd_usx2y_pcm_close,
933 .hw_params = snd_usx2y_pcm_hw_params,
934 .hw_free = snd_usx2y_pcm_hw_free,
935 .prepare = snd_usx2y_pcm_prepare,
936 .trigger = snd_usx2y_pcm_trigger,
937 .pointer = snd_usx2y_pcm_pointer,
938};
939
940/*
941 * free a usb stream instance
942 */
943static void usx2y_audio_stream_free(struct snd_usx2y_substream **usx2y_substream)
944{
945 int stream;
946
947 for_each_pcm_streams(stream) {
948 kfree(objp: usx2y_substream[stream]);
949 usx2y_substream[stream] = NULL;
950 }
951}
952
953static void snd_usx2y_pcm_private_free(struct snd_pcm *pcm)
954{
955 struct snd_usx2y_substream **usx2y_stream = pcm->private_data;
956
957 if (usx2y_stream)
958 usx2y_audio_stream_free(usx2y_substream: usx2y_stream);
959}
960
961static int usx2y_audio_stream_new(struct snd_card *card, int playback_endpoint, int capture_endpoint)
962{
963 struct snd_pcm *pcm;
964 int err, i;
965 struct snd_usx2y_substream **usx2y_substream =
966 usx2y(card)->subs + 2 * usx2y(card)->pcm_devs;
967
968 for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
969 i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
970 usx2y_substream[i] = kzalloc(size: sizeof(struct snd_usx2y_substream), GFP_KERNEL);
971 if (!usx2y_substream[i])
972 return -ENOMEM;
973
974 usx2y_substream[i]->usx2y = usx2y(card);
975 }
976
977 if (playback_endpoint)
978 usx2y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
979 usx2y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;
980
981 err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usx2y(card)->pcm_devs,
982 playback_count: playback_endpoint ? 1 : 0, capture_count: 1,
983 rpcm: &pcm);
984 if (err < 0) {
985 usx2y_audio_stream_free(usx2y_substream);
986 return err;
987 }
988
989 if (playback_endpoint)
990 snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_PLAYBACK, ops: &snd_usx2y_pcm_ops);
991 snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_CAPTURE, ops: &snd_usx2y_pcm_ops);
992
993 pcm->private_data = usx2y_substream;
994 pcm->private_free = snd_usx2y_pcm_private_free;
995 pcm->info_flags = 0;
996
997 sprintf(buf: pcm->name, NAME_ALLCAPS" Audio #%d", usx2y(card)->pcm_devs);
998
999 if (playback_endpoint) {
1000 snd_pcm_set_managed_buffer(substream: pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
1001 SNDRV_DMA_TYPE_CONTINUOUS,
1002 NULL,
1003 size: 64*1024, max: 128*1024);
1004 }
1005
1006 snd_pcm_set_managed_buffer(substream: pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
1007 SNDRV_DMA_TYPE_CONTINUOUS,
1008 NULL,
1009 size: 64*1024, max: 128*1024);
1010 usx2y(card)->pcm_devs++;
1011
1012 return 0;
1013}
1014
1015/*
1016 * create a chip instance and set its names.
1017 */
1018int usx2y_audio_create(struct snd_card *card)
1019{
1020 int err;
1021
1022 err = usx2y_audio_stream_new(card, playback_endpoint: 0xA, capture_endpoint: 0x8);
1023 if (err < 0)
1024 return err;
1025 if (le16_to_cpu(usx2y(card)->dev->descriptor.idProduct) == USB_ID_US428) {
1026 err = usx2y_audio_stream_new(card, playback_endpoint: 0, capture_endpoint: 0xA);
1027 if (err < 0)
1028 return err;
1029 }
1030 if (le16_to_cpu(usx2y(card)->dev->descriptor.idProduct) != USB_ID_US122)
1031 err = usx2y_rate_set(usx2y(card), rate: 44100); // Lets us428 recognize output-volume settings, disturbs us122.
1032 return err;
1033}
1034

source code of linux/sound/usb/usx2y/usbusx2yaudio.c