Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1/*
2 * Line6 Linux USB driver - 0.9.1beta
3 *
4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
12#include <linux/slab.h>
13#include <sound/core.h>
14#include <sound/pcm.h>
15#include <sound/pcm_params.h>
16
17#include "audio.h"
18#include "capture.h"
19#include "driver.h"
20#include "pcm.h"
21#include "pod.h"
22#include "playback.h"
23
24/*
25 Software stereo volume control.
26*/
27static void change_volume(struct urb *urb_out, int volume[],
28 int bytes_per_frame)
29{
30 int chn = 0;
31
32 if (volume[0] == 256 && volume[1] == 256)
33 return; /* maximum volume - no change */
34
35 if (bytes_per_frame == 4) {
36 short *p, *buf_end;
37 p = (short *)urb_out->transfer_buffer;
38 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
39
40 for (; p < buf_end; ++p) {
41 *p = (*p * volume[chn & 1]) >> 8;
42 ++chn;
43 }
44 } else if (bytes_per_frame == 6) {
45 unsigned char *p, *buf_end;
46 p = (unsigned char *)urb_out->transfer_buffer;
47 buf_end = p + urb_out->transfer_buffer_length;
48
49 for (; p < buf_end; p += 3) {
50 int val;
51 val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
52 val = (val * volume[chn & 1]) >> 8;
53 p[0] = val;
54 p[1] = val >> 8;
55 p[2] = val >> 16;
56 ++chn;
57 }
58 }
59}
60
61#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
62
63/*
64 Create signal for impulse response test.
65*/
66static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
67 struct urb *urb_out, int bytes_per_frame)
68{
69 int frames = urb_out->transfer_buffer_length / bytes_per_frame;
70
71 if (bytes_per_frame == 4) {
72 int i;
73 short *pi = (short *)line6pcm->prev_fbuf;
74 short *po = (short *)urb_out->transfer_buffer;
75
76 for (i = 0; i < frames; ++i) {
77 po[0] = pi[0];
78 po[1] = 0;
79 pi += 2;
80 po += 2;
81 }
82 } else if (bytes_per_frame == 6) {
83 int i, j;
84 unsigned char *pi = line6pcm->prev_fbuf;
85 unsigned char *po = urb_out->transfer_buffer;
86
87 for (i = 0; i < frames; ++i) {
88 for (j = 0; j < bytes_per_frame / 2; ++j)
89 po[j] = pi[j];
90
91 for (; j < bytes_per_frame; ++j)
92 po[j] = 0;
93
94 pi += bytes_per_frame;
95 po += bytes_per_frame;
96 }
97 }
98 if (--line6pcm->impulse_count <= 0) {
99 ((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
100 1] =
101 line6pcm->impulse_volume;
102 line6pcm->impulse_count = line6pcm->impulse_period;
103 }
104}
105
106#endif
107
108/*
109 Add signal to buffer for software monitoring.
110*/
111static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
112 int volume, int bytes_per_frame)
113{
114 if (volume == 0)
115 return; /* zero volume - no change */
116
117 if (bytes_per_frame == 4) {
118 short *pi, *po, *buf_end;
119 pi = (short *)signal;
120 po = (short *)urb_out->transfer_buffer;
121 buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
122
123 for (; po < buf_end; ++pi, ++po)
124 *po += (*pi * volume) >> 8;
125 }
126
127 /*
128 We don't need to handle devices with 6 bytes per frame here
129 since they all support hardware monitoring.
130 */
131}
132
133/*
134 Find a free URB, prepare audio data, and submit URB.
135*/
136static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
137{
138 int index;
139 unsigned long flags;
140 int i, urb_size, urb_frames;
141 int ret;
142 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
143 const int frame_increment =
144 line6pcm->properties->snd_line6_rates.rats[0].num_min;
145 const int frame_factor =
146 line6pcm->properties->snd_line6_rates.rats[0].den *
147 (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
148 struct urb *urb_out;
149
150 spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
151 index =
152 find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
153
154 if (index < 0 || index >= LINE6_ISO_BUFFERS) {
155 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
156 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
157 return -EINVAL;
158 }
159
160 urb_out = line6pcm->urb_audio_out[index];
161 urb_size = 0;
162
163 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
164 /* compute frame size for given sampling rate */
165 int fsize = 0;
166 struct usb_iso_packet_descriptor *fout =
167 &urb_out->iso_frame_desc[i];
168
169 if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
170 fsize = line6pcm->prev_fsize;
171
172 if (fsize == 0) {
173 int n;
174 line6pcm->count_out += frame_increment;
175 n = line6pcm->count_out / frame_factor;
176 line6pcm->count_out -= n * frame_factor;
177 fsize = n * bytes_per_frame;
178 }
179
180 fout->offset = urb_size;
181 fout->length = fsize;
182 urb_size += fsize;
183 }
184
185 if (urb_size == 0) {
186 /* can't determine URB size */
187 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
188 dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n"); /* this is somewhat paranoid */
189 return -EINVAL;
190 }
191
192 urb_frames = urb_size / bytes_per_frame;
193 urb_out->transfer_buffer =
194 line6pcm->buffer_out +
195 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
196 urb_out->transfer_buffer_length = urb_size;
197 urb_out->context = line6pcm;
198
199 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
200 !test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
201 struct snd_pcm_runtime *runtime =
202 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
203
204 if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
205 /*
206 The transferred area goes over buffer boundary,
207 copy the data to the temp buffer.
208 */
209 int len;
210 len = runtime->buffer_size - line6pcm->pos_out;
211
212 if (len > 0) {
213 memcpy(urb_out->transfer_buffer,
214 runtime->dma_area +
215 line6pcm->pos_out * bytes_per_frame,
216 len * bytes_per_frame);
217 memcpy(urb_out->transfer_buffer +
218 len * bytes_per_frame, runtime->dma_area,
219 (urb_frames - len) * bytes_per_frame);
220 } else
221 dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", len); /* this is somewhat paranoid */
222 } else {
223 memcpy(urb_out->transfer_buffer,
224 runtime->dma_area +
225 line6pcm->pos_out * bytes_per_frame,
226 urb_out->transfer_buffer_length);
227 }
228
229 line6pcm->pos_out += urb_frames;
230 if (line6pcm->pos_out >= runtime->buffer_size)
231 line6pcm->pos_out -= runtime->buffer_size;
232 } else {
233 memset(urb_out->transfer_buffer, 0,
234 urb_out->transfer_buffer_length);
235 }
236
237 change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
238
239 if (line6pcm->prev_fbuf != NULL) {
240#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
241 if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
242 create_impulse_test_signal(line6pcm, urb_out,
243 bytes_per_frame);
244 if (line6pcm->flags & LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
245 line6_capture_copy(line6pcm,
246 urb_out->transfer_buffer,
247 urb_out->
248 transfer_buffer_length);
249 line6_capture_check_period(line6pcm,
250 urb_out->transfer_buffer_length);
251 }
252 } else {
253#endif
254 if (!
255 (line6pcm->line6->
256 properties->capabilities & LINE6_BIT_HWMON)
257 && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
258 && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
259 add_monitor_signal(urb_out, line6pcm->prev_fbuf,
260 line6pcm->volume_monitor,
261 bytes_per_frame);
262#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
263 }
264#endif
265 }
266#ifdef CONFIG_LINE6_USB_DUMP_PCM
267 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
268 struct usb_iso_packet_descriptor *fout =
269 &urb_out->iso_frame_desc[i];
270 line6_write_hexdump(line6pcm->line6, 'P',
271 urb_out->transfer_buffer + fout->offset,
272 fout->length);
273 }
274#endif
275
276 ret = usb_submit_urb(urb_out, GFP_ATOMIC);
277
278 if (ret == 0)
279 set_bit(index, &line6pcm->active_urb_out);
280 else
281 dev_err(line6pcm->line6->ifcdev,
282 "URB out #%d submission failed (%d)\n", index, ret);
283
284 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
285 return 0;
286}
287
288/*
289 Submit all currently available playback URBs.
290*/
291int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
292{
293 int ret, i;
294
295 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
296 ret = submit_audio_out_urb(line6pcm);
297 if (ret < 0)
298 return ret;
299 }
300
301 return 0;
302}
303
304/*
305 Unlink all currently active playback URBs.
306*/
307void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
308{
309 unsigned int i;
310
311 for (i = LINE6_ISO_BUFFERS; i--;) {
312 if (test_bit(i, &line6pcm->active_urb_out)) {
313 if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
314 struct urb *u = line6pcm->urb_audio_out[i];
315 usb_unlink_urb(u);
316 }
317 }
318 }
319}
320
321/*
322 Wait until unlinking of all currently active playback URBs has been finished.
323*/
324void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
325{
326 int timeout = HZ;
327 unsigned int i;
328 int alive;
329
330 do {
331 alive = 0;
332 for (i = LINE6_ISO_BUFFERS; i--;) {
333 if (test_bit(i, &line6pcm->active_urb_out))
334 alive++;
335 }
336 if (!alive)
337 break;
338 set_current_state(TASK_UNINTERRUPTIBLE);
339 schedule_timeout(1);
340 } while (--timeout > 0);
341 if (alive)
342 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
343}
344
345/*
346 Unlink all currently active playback URBs, and wait for finishing.
347*/
348void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
349{
350 line6_unlink_audio_out_urbs(line6pcm);
351 line6_wait_clear_audio_out_urbs(line6pcm);
352}
353
354void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
355{
356 kfree(line6pcm->buffer_out);
357 line6pcm->buffer_out = NULL;
358}
359
360/*
361 Callback for completed playback URB.
362*/
363static void audio_out_callback(struct urb *urb)
364{
365 int i, index, length = 0, shutdown = 0;
366 unsigned long flags;
367
368 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
369 struct snd_pcm_substream *substream =
370 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
371
372#if USE_CLEAR_BUFFER_WORKAROUND
373 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
374#endif
375
376 line6pcm->last_frame_out = urb->start_frame;
377
378 /* find index of URB */
379 for (index = LINE6_ISO_BUFFERS; index--;)
380 if (urb == line6pcm->urb_audio_out[index])
381 break;
382
383 if (index < 0)
384 return; /* URB has been unlinked asynchronously */
385
386 for (i = LINE6_ISO_PACKETS; i--;)
387 length += urb->iso_frame_desc[i].length;
388
389 spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
390
391 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
392 struct snd_pcm_runtime *runtime = substream->runtime;
393 line6pcm->pos_out_done +=
394 length / line6pcm->properties->bytes_per_frame;
395
396 if (line6pcm->pos_out_done >= runtime->buffer_size)
397 line6pcm->pos_out_done -= runtime->buffer_size;
398 }
399
400 clear_bit(index, &line6pcm->active_urb_out);
401
402 for (i = LINE6_ISO_PACKETS; i--;)
403 if (urb->iso_frame_desc[i].status == -EXDEV) {
404 shutdown = 1;
405 break;
406 }
407
408 if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
409 shutdown = 1;
410
411 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
412
413 if (!shutdown) {
414 submit_audio_out_urb(line6pcm);
415
416 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
417 line6pcm->bytes_out += length;
418 if (line6pcm->bytes_out >= line6pcm->period_out) {
419 line6pcm->bytes_out %= line6pcm->period_out;
420 snd_pcm_period_elapsed(substream);
421 }
422 }
423 }
424}
425
426/* open playback callback */
427static int snd_line6_playback_open(struct snd_pcm_substream *substream)
428{
429 int err;
430 struct snd_pcm_runtime *runtime = substream->runtime;
431 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
432
433 err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
434 (&line6pcm->
435 properties->snd_line6_rates));
436 if (err < 0)
437 return err;
438
439 runtime->hw = line6pcm->properties->snd_line6_playback_hw;
440 return 0;
441}
442
443/* close playback callback */
444static int snd_line6_playback_close(struct snd_pcm_substream *substream)
445{
446 return 0;
447}
448
449/* hw_params playback callback */
450static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
451 struct snd_pcm_hw_params *hw_params)
452{
453 int ret;
454 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
455
456 /* -- Florian Demski [FD] */
457 /* don't ask me why, but this fixes the bug on my machine */
458 if (line6pcm == NULL) {
459 if (substream->pcm == NULL)
460 return -ENOMEM;
461 if (substream->pcm->private_data == NULL)
462 return -ENOMEM;
463 substream->private_data = substream->pcm->private_data;
464 line6pcm = snd_pcm_substream_chip(substream);
465 }
466 /* -- [FD] end */
467
468 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
469
470 if (ret < 0)
471 return ret;
472
473 ret = snd_pcm_lib_malloc_pages(substream,
474 params_buffer_bytes(hw_params));
475 if (ret < 0) {
476 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
477 return ret;
478 }
479
480 line6pcm->period_out = params_period_bytes(hw_params);
481 return 0;
482}
483
484/* hw_free playback callback */
485static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
486{
487 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
488 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
489 return snd_pcm_lib_free_pages(substream);
490}
491
492/* trigger playback callback */
493int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
494{
495 int err;
496
497 switch (cmd) {
498 case SNDRV_PCM_TRIGGER_START:
499#ifdef CONFIG_PM
500 case SNDRV_PCM_TRIGGER_RESUME:
501#endif
502 err = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
503
504 if (err < 0)
505 return err;
506
507 break;
508
509 case SNDRV_PCM_TRIGGER_STOP:
510#ifdef CONFIG_PM
511 case SNDRV_PCM_TRIGGER_SUSPEND:
512#endif
513 err = line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
514
515 if (err < 0)
516 return err;
517
518 break;
519
520 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
521 set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
522 break;
523
524 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
525 clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
526 break;
527
528 default:
529 return -EINVAL;
530 }
531
532 return 0;
533}
534
535/* playback pointer callback */
536static snd_pcm_uframes_t
537snd_line6_playback_pointer(struct snd_pcm_substream *substream)
538{
539 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
540 return line6pcm->pos_out_done;
541}
542
543/* playback operators */
544struct snd_pcm_ops snd_line6_playback_ops = {
545 .open = snd_line6_playback_open,
546 .close = snd_line6_playback_close,
547 .ioctl = snd_pcm_lib_ioctl,
548 .hw_params = snd_line6_playback_hw_params,
549 .hw_free = snd_line6_playback_hw_free,
550 .prepare = snd_line6_prepare,
551 .trigger = snd_line6_trigger,
552 .pointer = snd_line6_playback_pointer,
553};
554
555int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
556{
557 int i;
558
559 /* create audio URBs and fill in constant values: */
560 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
561 struct urb *urb;
562
563 /* URB for audio out: */
564 urb = line6pcm->urb_audio_out[i] =
565 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
566
567 if (urb == NULL) {
568 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
569 return -ENOMEM;
570 }
571
572 urb->dev = line6pcm->line6->usbdev;
573 urb->pipe =
574 usb_sndisocpipe(line6pcm->line6->usbdev,
575 line6pcm->ep_audio_write &
576 USB_ENDPOINT_NUMBER_MASK);
577 urb->transfer_flags = URB_ISO_ASAP;
578 urb->start_frame = -1;
579 urb->number_of_packets = LINE6_ISO_PACKETS;
580 urb->interval = LINE6_ISO_INTERVAL;
581 urb->error_count = 0;
582 urb->complete = audio_out_callback;
583 }
584
585 return 0;
586}