Linux kernel mirror (for testing)
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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");
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",
222 len);
223 } else {
224 memcpy(urb_out->transfer_buffer,
225 runtime->dma_area +
226 line6pcm->pos_out * bytes_per_frame,
227 urb_out->transfer_buffer_length);
228 }
229
230 line6pcm->pos_out += urb_frames;
231 if (line6pcm->pos_out >= runtime->buffer_size)
232 line6pcm->pos_out -= runtime->buffer_size;
233 } else {
234 memset(urb_out->transfer_buffer, 0,
235 urb_out->transfer_buffer_length);
236 }
237
238 change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
239
240 if (line6pcm->prev_fbuf != NULL) {
241#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
242 if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
243 create_impulse_test_signal(line6pcm, urb_out,
244 bytes_per_frame);
245 if (line6pcm->flags & LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
246 line6_capture_copy(line6pcm,
247 urb_out->transfer_buffer,
248 urb_out->
249 transfer_buffer_length);
250 line6_capture_check_period(line6pcm,
251 urb_out->transfer_buffer_length);
252 }
253 } else {
254#endif
255 if (!
256 (line6pcm->line6->
257 properties->capabilities & LINE6_BIT_HWMON)
258 && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
259 && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
260 add_monitor_signal(urb_out, line6pcm->prev_fbuf,
261 line6pcm->volume_monitor,
262 bytes_per_frame);
263#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
264 }
265#endif
266 }
267
268 ret = usb_submit_urb(urb_out, GFP_ATOMIC);
269
270 if (ret == 0)
271 set_bit(index, &line6pcm->active_urb_out);
272 else
273 dev_err(line6pcm->line6->ifcdev,
274 "URB out #%d submission failed (%d)\n", index, ret);
275
276 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
277 return 0;
278}
279
280/*
281 Submit all currently available playback URBs.
282*/
283int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
284{
285 int ret, i;
286
287 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
288 ret = submit_audio_out_urb(line6pcm);
289 if (ret < 0)
290 return ret;
291 }
292
293 return 0;
294}
295
296/*
297 Unlink all currently active playback URBs.
298*/
299void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
300{
301 unsigned int i;
302
303 for (i = LINE6_ISO_BUFFERS; i--;) {
304 if (test_bit(i, &line6pcm->active_urb_out)) {
305 if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
306 struct urb *u = line6pcm->urb_audio_out[i];
307 usb_unlink_urb(u);
308 }
309 }
310 }
311}
312
313/*
314 Wait until unlinking of all currently active playback URBs has been
315 finished.
316*/
317void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
318{
319 int timeout = HZ;
320 unsigned int i;
321 int alive;
322
323 do {
324 alive = 0;
325 for (i = LINE6_ISO_BUFFERS; i--;) {
326 if (test_bit(i, &line6pcm->active_urb_out))
327 alive++;
328 }
329 if (!alive)
330 break;
331 set_current_state(TASK_UNINTERRUPTIBLE);
332 schedule_timeout(1);
333 } while (--timeout > 0);
334 if (alive)
335 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
336}
337
338/*
339 Unlink all currently active playback URBs, and wait for finishing.
340*/
341void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
342{
343 line6_unlink_audio_out_urbs(line6pcm);
344 line6_wait_clear_audio_out_urbs(line6pcm);
345}
346
347void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
348{
349 kfree(line6pcm->buffer_out);
350 line6pcm->buffer_out = NULL;
351}
352
353/*
354 Callback for completed playback URB.
355*/
356static void audio_out_callback(struct urb *urb)
357{
358 int i, index, length = 0, shutdown = 0;
359 unsigned long flags;
360
361 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
362 struct snd_pcm_substream *substream =
363 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
364
365#if USE_CLEAR_BUFFER_WORKAROUND
366 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
367#endif
368
369 line6pcm->last_frame_out = urb->start_frame;
370
371 /* find index of URB */
372 for (index = LINE6_ISO_BUFFERS; index--;)
373 if (urb == line6pcm->urb_audio_out[index])
374 break;
375
376 if (index < 0)
377 return; /* URB has been unlinked asynchronously */
378
379 for (i = LINE6_ISO_PACKETS; i--;)
380 length += urb->iso_frame_desc[i].length;
381
382 spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
383
384 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
385 struct snd_pcm_runtime *runtime = substream->runtime;
386 line6pcm->pos_out_done +=
387 length / line6pcm->properties->bytes_per_frame;
388
389 if (line6pcm->pos_out_done >= runtime->buffer_size)
390 line6pcm->pos_out_done -= runtime->buffer_size;
391 }
392
393 clear_bit(index, &line6pcm->active_urb_out);
394
395 for (i = LINE6_ISO_PACKETS; i--;)
396 if (urb->iso_frame_desc[i].status == -EXDEV) {
397 shutdown = 1;
398 break;
399 }
400
401 if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
402 shutdown = 1;
403
404 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
405
406 if (!shutdown) {
407 submit_audio_out_urb(line6pcm);
408
409 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
410 &line6pcm->flags)) {
411 line6pcm->bytes_out += length;
412 if (line6pcm->bytes_out >= line6pcm->period_out) {
413 line6pcm->bytes_out %= line6pcm->period_out;
414 snd_pcm_period_elapsed(substream);
415 }
416 }
417 }
418}
419
420/* open playback callback */
421static int snd_line6_playback_open(struct snd_pcm_substream *substream)
422{
423 int err;
424 struct snd_pcm_runtime *runtime = substream->runtime;
425 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
426
427 err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
428 (&line6pcm->
429 properties->snd_line6_rates));
430 if (err < 0)
431 return err;
432
433 runtime->hw = line6pcm->properties->snd_line6_playback_hw;
434 return 0;
435}
436
437/* close playback callback */
438static int snd_line6_playback_close(struct snd_pcm_substream *substream)
439{
440 return 0;
441}
442
443/* hw_params playback callback */
444static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
445 struct snd_pcm_hw_params *hw_params)
446{
447 int ret;
448 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
449
450 /* -- Florian Demski [FD] */
451 /* don't ask me why, but this fixes the bug on my machine */
452 if (line6pcm == NULL) {
453 if (substream->pcm == NULL)
454 return -ENOMEM;
455 if (substream->pcm->private_data == NULL)
456 return -ENOMEM;
457 substream->private_data = substream->pcm->private_data;
458 line6pcm = snd_pcm_substream_chip(substream);
459 }
460 /* -- [FD] end */
461
462 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
463
464 if (ret < 0)
465 return ret;
466
467 ret = snd_pcm_lib_malloc_pages(substream,
468 params_buffer_bytes(hw_params));
469 if (ret < 0) {
470 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
471 return ret;
472 }
473
474 line6pcm->period_out = params_period_bytes(hw_params);
475 return 0;
476}
477
478/* hw_free playback callback */
479static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
480{
481 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
482 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
483 return snd_pcm_lib_free_pages(substream);
484}
485
486/* trigger playback callback */
487int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
488{
489 int err;
490
491 switch (cmd) {
492 case SNDRV_PCM_TRIGGER_START:
493#ifdef CONFIG_PM
494 case SNDRV_PCM_TRIGGER_RESUME:
495#endif
496 err = line6_pcm_acquire(line6pcm,
497 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
498
499 if (err < 0)
500 return err;
501
502 break;
503
504 case SNDRV_PCM_TRIGGER_STOP:
505#ifdef CONFIG_PM
506 case SNDRV_PCM_TRIGGER_SUSPEND:
507#endif
508 err = line6_pcm_release(line6pcm,
509 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
510
511 if (err < 0)
512 return err;
513
514 break;
515
516 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
517 set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
518 break;
519
520 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
521 clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
522 break;
523
524 default:
525 return -EINVAL;
526 }
527
528 return 0;
529}
530
531/* playback pointer callback */
532static snd_pcm_uframes_t
533snd_line6_playback_pointer(struct snd_pcm_substream *substream)
534{
535 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
536 return line6pcm->pos_out_done;
537}
538
539/* playback operators */
540struct snd_pcm_ops snd_line6_playback_ops = {
541 .open = snd_line6_playback_open,
542 .close = snd_line6_playback_close,
543 .ioctl = snd_pcm_lib_ioctl,
544 .hw_params = snd_line6_playback_hw_params,
545 .hw_free = snd_line6_playback_hw_free,
546 .prepare = snd_line6_prepare,
547 .trigger = snd_line6_trigger,
548 .pointer = snd_line6_playback_pointer,
549};
550
551int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
552{
553 int i;
554
555 /* create audio URBs and fill in constant values: */
556 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
557 struct urb *urb;
558
559 /* URB for audio out: */
560 urb = line6pcm->urb_audio_out[i] =
561 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
562
563 if (urb == NULL) {
564 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
565 return -ENOMEM;
566 }
567
568 urb->dev = line6pcm->line6->usbdev;
569 urb->pipe =
570 usb_sndisocpipe(line6pcm->line6->usbdev,
571 line6pcm->ep_audio_write &
572 USB_ENDPOINT_NUMBER_MASK);
573 urb->transfer_flags = URB_ISO_ASAP;
574 urb->start_frame = -1;
575 urb->number_of_packets = LINE6_ISO_PACKETS;
576 urb->interval = LINE6_ISO_INTERVAL;
577 urb->error_count = 0;
578 urb->complete = audio_out_callback;
579 }
580
581 return 0;
582}