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 */
change_volume(struct urb * urb_out,int volume[],int bytes_per_frame)27 static 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
38 p = (short *)urb_out->transfer_buffer;
39 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
40
41 for (; p < buf_end; ++p) {
42 *p = (*p * volume[chn & 1]) >> 8;
43 ++chn;
44 }
45 } else if (bytes_per_frame == 6) {
46 unsigned char *p, *buf_end;
47
48 p = (unsigned char *)urb_out->transfer_buffer;
49 buf_end = p + urb_out->transfer_buffer_length;
50
51 for (; p < buf_end; p += 3) {
52 int val;
53
54 val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
55 val = (val * volume[chn & 1]) >> 8;
56 p[0] = val;
57 p[1] = val >> 8;
58 p[2] = val >> 16;
59 ++chn;
60 }
61 }
62 }
63
64 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
65
66 /*
67 Create signal for impulse response test.
68 */
create_impulse_test_signal(struct snd_line6_pcm * line6pcm,struct urb * urb_out,int bytes_per_frame)69 static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
70 struct urb *urb_out, int bytes_per_frame)
71 {
72 int frames = urb_out->transfer_buffer_length / bytes_per_frame;
73
74 if (bytes_per_frame == 4) {
75 int i;
76 short *pi = (short *)line6pcm->prev_fbuf;
77 short *po = (short *)urb_out->transfer_buffer;
78
79 for (i = 0; i < frames; ++i) {
80 po[0] = pi[0];
81 po[1] = 0;
82 pi += 2;
83 po += 2;
84 }
85 } else if (bytes_per_frame == 6) {
86 int i, j;
87 unsigned char *pi = line6pcm->prev_fbuf;
88 unsigned char *po = urb_out->transfer_buffer;
89
90 for (i = 0; i < frames; ++i) {
91 for (j = 0; j < bytes_per_frame / 2; ++j)
92 po[j] = pi[j];
93
94 for (; j < bytes_per_frame; ++j)
95 po[j] = 0;
96
97 pi += bytes_per_frame;
98 po += bytes_per_frame;
99 }
100 }
101 if (--line6pcm->impulse_count <= 0) {
102 ((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
103 1] =
104 line6pcm->impulse_volume;
105 line6pcm->impulse_count = line6pcm->impulse_period;
106 }
107 }
108
109 #endif
110
111 /*
112 Add signal to buffer for software monitoring.
113 */
add_monitor_signal(struct urb * urb_out,unsigned char * signal,int volume,int bytes_per_frame)114 static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
115 int volume, int bytes_per_frame)
116 {
117 if (volume == 0)
118 return; /* zero volume - no change */
119
120 if (bytes_per_frame == 4) {
121 short *pi, *po, *buf_end;
122
123 pi = (short *)signal;
124 po = (short *)urb_out->transfer_buffer;
125 buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
126
127 for (; po < buf_end; ++pi, ++po)
128 *po += (*pi * volume) >> 8;
129 }
130
131 /*
132 We don't need to handle devices with 6 bytes per frame here
133 since they all support hardware monitoring.
134 */
135 }
136
137 /*
138 Find a free URB, prepare audio data, and submit URB.
139 */
submit_audio_out_urb(struct snd_line6_pcm * line6pcm)140 static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
141 {
142 int index;
143 unsigned long flags;
144 int i, urb_size, urb_frames;
145 int ret;
146 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
147 const int frame_increment =
148 line6pcm->properties->snd_line6_rates.rats[0].num_min;
149 const int frame_factor =
150 line6pcm->properties->snd_line6_rates.rats[0].den *
151 (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
152 struct urb *urb_out;
153
154 spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
155 index =
156 find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
157
158 if (index < 0 || index >= LINE6_ISO_BUFFERS) {
159 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
160 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
161 return -EINVAL;
162 }
163
164 urb_out = line6pcm->urb_audio_out[index];
165 urb_size = 0;
166
167 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
168 /* compute frame size for given sampling rate */
169 int fsize = 0;
170 struct usb_iso_packet_descriptor *fout =
171 &urb_out->iso_frame_desc[i];
172
173 if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
174 fsize = line6pcm->prev_fsize;
175
176 if (fsize == 0) {
177 int n;
178
179 line6pcm->count_out += frame_increment;
180 n = line6pcm->count_out / frame_factor;
181 line6pcm->count_out -= n * frame_factor;
182 fsize = n * bytes_per_frame;
183 }
184
185 fout->offset = urb_size;
186 fout->length = fsize;
187 urb_size += fsize;
188 }
189
190 if (urb_size == 0) {
191 /* can't determine URB size */
192 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
193 dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
194 return -EINVAL;
195 }
196
197 urb_frames = urb_size / bytes_per_frame;
198 urb_out->transfer_buffer =
199 line6pcm->buffer_out +
200 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
201 urb_out->transfer_buffer_length = urb_size;
202 urb_out->context = line6pcm;
203
204 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
205 !test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
206 struct snd_pcm_runtime *runtime =
207 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
208
209 if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
210 /*
211 The transferred area goes over buffer boundary,
212 copy the data to the temp buffer.
213 */
214 int len;
215
216 len = runtime->buffer_size - line6pcm->pos_out;
217
218 if (len > 0) {
219 memcpy(urb_out->transfer_buffer,
220 runtime->dma_area +
221 line6pcm->pos_out * bytes_per_frame,
222 len * bytes_per_frame);
223 memcpy(urb_out->transfer_buffer +
224 len * bytes_per_frame, runtime->dma_area,
225 (urb_frames - len) * bytes_per_frame);
226 } else
227 dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
228 len);
229 } else {
230 memcpy(urb_out->transfer_buffer,
231 runtime->dma_area +
232 line6pcm->pos_out * bytes_per_frame,
233 urb_out->transfer_buffer_length);
234 }
235
236 line6pcm->pos_out += urb_frames;
237 if (line6pcm->pos_out >= runtime->buffer_size)
238 line6pcm->pos_out -= runtime->buffer_size;
239 } else {
240 memset(urb_out->transfer_buffer, 0,
241 urb_out->transfer_buffer_length);
242 }
243
244 change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
245
246 if (line6pcm->prev_fbuf != NULL) {
247 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
248 if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
249 create_impulse_test_signal(line6pcm, urb_out,
250 bytes_per_frame);
251 if (line6pcm->flags &
252 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
253 line6_capture_copy(line6pcm,
254 urb_out->transfer_buffer,
255 urb_out->
256 transfer_buffer_length);
257 line6_capture_check_period(line6pcm,
258 urb_out->transfer_buffer_length);
259 }
260 } else {
261 #endif
262 if (!
263 (line6pcm->line6->
264 properties->capabilities & LINE6_BIT_HWMON)
265 && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
266 && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
267 add_monitor_signal(urb_out, line6pcm->prev_fbuf,
268 line6pcm->volume_monitor,
269 bytes_per_frame);
270 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
271 }
272 #endif
273 }
274
275 ret = usb_submit_urb(urb_out, GFP_ATOMIC);
276
277 if (ret == 0)
278 set_bit(index, &line6pcm->active_urb_out);
279 else
280 dev_err(line6pcm->line6->ifcdev,
281 "URB out #%d submission failed (%d)\n", index, ret);
282
283 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
284 return 0;
285 }
286
287 /*
288 Submit all currently available playback URBs.
289 */
line6_submit_audio_out_all_urbs(struct snd_line6_pcm * line6pcm)290 int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
291 {
292 int ret, i;
293
294 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
295 ret = submit_audio_out_urb(line6pcm);
296 if (ret < 0)
297 return ret;
298 }
299
300 return 0;
301 }
302
303 /*
304 Unlink all currently active playback URBs.
305 */
line6_unlink_audio_out_urbs(struct snd_line6_pcm * line6pcm)306 void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
307 {
308 unsigned int i;
309
310 for (i = LINE6_ISO_BUFFERS; i--;) {
311 if (test_bit(i, &line6pcm->active_urb_out)) {
312 if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
313 struct urb *u = line6pcm->urb_audio_out[i];
314
315 usb_unlink_urb(u);
316 }
317 }
318 }
319 }
320
321 /*
322 Wait until unlinking of all currently active playback URBs has been
323 finished.
324 */
line6_wait_clear_audio_out_urbs(struct snd_line6_pcm * line6pcm)325 void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
326 {
327 int timeout = HZ;
328 unsigned int i;
329 int alive;
330
331 do {
332 alive = 0;
333 for (i = LINE6_ISO_BUFFERS; i--;) {
334 if (test_bit(i, &line6pcm->active_urb_out))
335 alive++;
336 }
337 if (!alive)
338 break;
339 set_current_state(TASK_UNINTERRUPTIBLE);
340 schedule_timeout(1);
341 } while (--timeout > 0);
342 if (alive)
343 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
344 }
345
346 /*
347 Unlink all currently active playback URBs, and wait for finishing.
348 */
line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm * line6pcm)349 void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
350 {
351 line6_unlink_audio_out_urbs(line6pcm);
352 line6_wait_clear_audio_out_urbs(line6pcm);
353 }
354
line6_free_playback_buffer(struct snd_line6_pcm * line6pcm)355 void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
356 {
357 kfree(line6pcm->buffer_out);
358 line6pcm->buffer_out = NULL;
359 }
360
361 /*
362 Callback for completed playback URB.
363 */
audio_out_callback(struct urb * urb)364 static void audio_out_callback(struct urb *urb)
365 {
366 int i, index, length = 0, shutdown = 0;
367 unsigned long flags;
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
394 line6pcm->pos_out_done +=
395 length / line6pcm->properties->bytes_per_frame;
396
397 if (line6pcm->pos_out_done >= runtime->buffer_size)
398 line6pcm->pos_out_done -= runtime->buffer_size;
399 }
400
401 clear_bit(index, &line6pcm->active_urb_out);
402
403 for (i = LINE6_ISO_PACKETS; i--;)
404 if (urb->iso_frame_desc[i].status == -EXDEV) {
405 shutdown = 1;
406 break;
407 }
408
409 if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
410 shutdown = 1;
411
412 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
413
414 if (!shutdown) {
415 submit_audio_out_urb(line6pcm);
416
417 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
418 &line6pcm->flags)) {
419 line6pcm->bytes_out += length;
420 if (line6pcm->bytes_out >= line6pcm->period_out) {
421 line6pcm->bytes_out %= line6pcm->period_out;
422 snd_pcm_period_elapsed(substream);
423 }
424 }
425 }
426 }
427
428 /* open playback callback */
snd_line6_playback_open(struct snd_pcm_substream * substream)429 static int snd_line6_playback_open(struct snd_pcm_substream *substream)
430 {
431 int err;
432 struct snd_pcm_runtime *runtime = substream->runtime;
433 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
434
435 err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
436 (&line6pcm->
437 properties->snd_line6_rates));
438 if (err < 0)
439 return err;
440
441 runtime->hw = line6pcm->properties->snd_line6_playback_hw;
442 return 0;
443 }
444
445 /* close playback callback */
snd_line6_playback_close(struct snd_pcm_substream * substream)446 static int snd_line6_playback_close(struct snd_pcm_substream *substream)
447 {
448 return 0;
449 }
450
451 /* hw_params playback callback */
snd_line6_playback_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)452 static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
453 struct snd_pcm_hw_params *hw_params)
454 {
455 int ret;
456 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
457
458 /* -- Florian Demski [FD] */
459 /* don't ask me why, but this fixes the bug on my machine */
460 if (line6pcm == NULL) {
461 if (substream->pcm == NULL)
462 return -ENOMEM;
463 if (substream->pcm->private_data == NULL)
464 return -ENOMEM;
465 substream->private_data = substream->pcm->private_data;
466 line6pcm = snd_pcm_substream_chip(substream);
467 }
468 /* -- [FD] end */
469
470 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
471
472 if (ret < 0)
473 return ret;
474
475 ret = snd_pcm_lib_malloc_pages(substream,
476 params_buffer_bytes(hw_params));
477 if (ret < 0) {
478 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
479 return ret;
480 }
481
482 line6pcm->period_out = params_period_bytes(hw_params);
483 return 0;
484 }
485
486 /* hw_free playback callback */
snd_line6_playback_hw_free(struct snd_pcm_substream * substream)487 static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
488 {
489 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
490
491 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
492 return snd_pcm_lib_free_pages(substream);
493 }
494
495 /* trigger playback callback */
snd_line6_playback_trigger(struct snd_line6_pcm * line6pcm,int cmd)496 int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
497 {
498 int err;
499
500 switch (cmd) {
501 case SNDRV_PCM_TRIGGER_START:
502 #ifdef CONFIG_PM
503 case SNDRV_PCM_TRIGGER_RESUME:
504 #endif
505 err = line6_pcm_acquire(line6pcm,
506 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
507
508 if (err < 0)
509 return err;
510
511 break;
512
513 case SNDRV_PCM_TRIGGER_STOP:
514 #ifdef CONFIG_PM
515 case SNDRV_PCM_TRIGGER_SUSPEND:
516 #endif
517 err = line6_pcm_release(line6pcm,
518 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
519
520 if (err < 0)
521 return err;
522
523 break;
524
525 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
526 set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
527 break;
528
529 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
530 clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
531 break;
532
533 default:
534 return -EINVAL;
535 }
536
537 return 0;
538 }
539
540 /* playback pointer callback */
541 static snd_pcm_uframes_t
snd_line6_playback_pointer(struct snd_pcm_substream * substream)542 snd_line6_playback_pointer(struct snd_pcm_substream *substream)
543 {
544 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
545
546 return line6pcm->pos_out_done;
547 }
548
549 /* playback operators */
550 struct snd_pcm_ops snd_line6_playback_ops = {
551 .open = snd_line6_playback_open,
552 .close = snd_line6_playback_close,
553 .ioctl = snd_pcm_lib_ioctl,
554 .hw_params = snd_line6_playback_hw_params,
555 .hw_free = snd_line6_playback_hw_free,
556 .prepare = snd_line6_prepare,
557 .trigger = snd_line6_trigger,
558 .pointer = snd_line6_playback_pointer,
559 };
560
line6_create_audio_out_urbs(struct snd_line6_pcm * line6pcm)561 int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
562 {
563 int i;
564
565 /* create audio URBs and fill in constant values: */
566 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
567 struct urb *urb;
568
569 /* URB for audio out: */
570 urb = line6pcm->urb_audio_out[i] =
571 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
572
573 if (urb == NULL) {
574 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
575 return -ENOMEM;
576 }
577
578 urb->dev = line6pcm->line6->usbdev;
579 urb->pipe =
580 usb_sndisocpipe(line6pcm->line6->usbdev,
581 line6pcm->ep_audio_write &
582 USB_ENDPOINT_NUMBER_MASK);
583 urb->transfer_flags = URB_ISO_ASAP;
584 urb->start_frame = -1;
585 urb->number_of_packets = LINE6_ISO_PACKETS;
586 urb->interval = LINE6_ISO_INTERVAL;
587 urb->error_count = 0;
588 urb->complete = audio_out_callback;
589 }
590
591 return 0;
592 }
593