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Linux/sound/usb/line6/playback.c

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  1 /*
  2  * Line 6 Linux USB driver
  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 "capture.h"
 18 #include "driver.h"
 19 #include "pcm.h"
 20 #include "playback.h"
 21 
 22 /*
 23         Software stereo volume control.
 24 */
 25 static void change_volume(struct urb *urb_out, int volume[],
 26                           int bytes_per_frame)
 27 {
 28         int chn = 0;
 29 
 30         if (volume[0] == 256 && volume[1] == 256)
 31                 return;         /* maximum volume - no change */
 32 
 33         if (bytes_per_frame == 4) {
 34                 __le16 *p, *buf_end;
 35 
 36                 p = (__le16 *)urb_out->transfer_buffer;
 37                 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
 38 
 39                 for (; p < buf_end; ++p) {
 40                         short pv = le16_to_cpu(*p);
 41                         int val = (pv * volume[chn & 1]) >> 8;
 42                         pv = clamp(val, -0x8000, 0x7fff);
 43                         *p = cpu_to_le16(pv);
 44                         ++chn;
 45                 }
 46         } else if (bytes_per_frame == 6) {
 47                 unsigned char *p, *buf_end;
 48 
 49                 p = (unsigned char *)urb_out->transfer_buffer;
 50                 buf_end = p + urb_out->transfer_buffer_length;
 51 
 52                 for (; p < buf_end; p += 3) {
 53                         int val;
 54 
 55                         val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
 56                         val = (val * volume[chn & 1]) >> 8;
 57                         val = clamp(val, -0x800000, 0x7fffff);
 58                         p[0] = val;
 59                         p[1] = val >> 8;
 60                         p[2] = val >> 16;
 61                         ++chn;
 62                 }
 63         }
 64 }
 65 
 66 /*
 67         Create signal for impulse response test.
 68 */
 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 /*
110         Add signal to buffer for software monitoring.
111 */
112 static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
113                                int volume, int bytes_per_frame)
114 {
115         if (volume == 0)
116                 return;         /* zero volume - no change */
117 
118         if (bytes_per_frame == 4) {
119                 __le16 *pi, *po, *buf_end;
120 
121                 pi = (__le16 *)signal;
122                 po = (__le16 *)urb_out->transfer_buffer;
123                 buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
124 
125                 for (; po < buf_end; ++pi, ++po) {
126                         short pov = le16_to_cpu(*po);
127                         short piv = le16_to_cpu(*pi);
128                         int val = pov + ((piv * volume) >> 8);
129                         pov = clamp(val, -0x8000, 0x7fff);
130                         *po = cpu_to_le16(pov);
131                 }
132         }
133 
134         /*
135            We don't need to handle devices with 6 bytes per frame here
136            since they all support hardware monitoring.
137          */
138 }
139 
140 /*
141         Find a free URB, prepare audio data, and submit URB.
142         must be called in line6pcm->out.lock context
143 */
144 static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
145 {
146         int index;
147         int i, urb_size, urb_frames;
148         int ret;
149         const int bytes_per_frame =
150                 line6pcm->properties->bytes_per_channel *
151                 line6pcm->properties->playback_hw.channels_max;
152         const int frame_increment =
153                 line6pcm->properties->rates.rats[0].num_min;
154         const int frame_factor =
155                 line6pcm->properties->rates.rats[0].den *
156                 (line6pcm->line6->intervals_per_second / LINE6_ISO_INTERVAL);
157         struct urb *urb_out;
158 
159         index = find_first_zero_bit(&line6pcm->out.active_urbs,
160                                     line6pcm->line6->iso_buffers);
161 
162         if (index < 0 || index >= line6pcm->line6->iso_buffers) {
163                 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
164                 return -EINVAL;
165         }
166 
167         urb_out = line6pcm->out.urbs[index];
168         urb_size = 0;
169 
170         /* TODO: this may not work for LINE6_ISO_PACKETS != 1 */
171         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
172                 /* compute frame size for given sampling rate */
173                 int fsize = 0;
174                 struct usb_iso_packet_descriptor *fout =
175                     &urb_out->iso_frame_desc[i];
176 
177                 fsize = line6pcm->prev_fsize;
178                 if (fsize == 0) {
179                         int n;
180 
181                         line6pcm->out.count += frame_increment;
182                         n = line6pcm->out.count / frame_factor;
183                         line6pcm->out.count -= n * frame_factor;
184                         fsize = n;
185                 }
186 
187                 fsize *= bytes_per_frame;
188 
189                 fout->offset = urb_size;
190                 fout->length = fsize;
191                 urb_size += fsize;
192         }
193 
194         if (urb_size == 0) {
195                 /* can't determine URB size */
196                 dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
197                 return -EINVAL;
198         }
199 
200         urb_frames = urb_size / bytes_per_frame;
201         urb_out->transfer_buffer =
202             line6pcm->out.buffer +
203             index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_out;
204         urb_out->transfer_buffer_length = urb_size;
205         urb_out->context = line6pcm;
206 
207         if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running) &&
208             !test_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags)) {
209                 struct snd_pcm_runtime *runtime =
210                     get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
211 
212                 if (line6pcm->out.pos + urb_frames > runtime->buffer_size) {
213                         /*
214                            The transferred area goes over buffer boundary,
215                            copy the data to the temp buffer.
216                          */
217                         int len;
218 
219                         len = runtime->buffer_size - line6pcm->out.pos;
220 
221                         if (len > 0) {
222                                 memcpy(urb_out->transfer_buffer,
223                                        runtime->dma_area +
224                                        line6pcm->out.pos * bytes_per_frame,
225                                        len * bytes_per_frame);
226                                 memcpy(urb_out->transfer_buffer +
227                                        len * bytes_per_frame, runtime->dma_area,
228                                        (urb_frames - len) * bytes_per_frame);
229                         } else
230                                 dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
231                                         len);
232                 } else {
233                         memcpy(urb_out->transfer_buffer,
234                                runtime->dma_area +
235                                line6pcm->out.pos * bytes_per_frame,
236                                urb_out->transfer_buffer_length);
237                 }
238 
239                 line6pcm->out.pos += urb_frames;
240                 if (line6pcm->out.pos >= runtime->buffer_size)
241                         line6pcm->out.pos -= runtime->buffer_size;
242 
243                 change_volume(urb_out, line6pcm->volume_playback,
244                               bytes_per_frame);
245         } else {
246                 memset(urb_out->transfer_buffer, 0,
247                        urb_out->transfer_buffer_length);
248         }
249 
250         spin_lock_nested(&line6pcm->in.lock, SINGLE_DEPTH_NESTING);
251         if (line6pcm->prev_fbuf) {
252                 if (test_bit(LINE6_STREAM_IMPULSE, &line6pcm->out.running)) {
253                         create_impulse_test_signal(line6pcm, urb_out,
254                                                    bytes_per_frame);
255                         if (test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) {
256                                 line6_capture_copy(line6pcm,
257                                                    urb_out->transfer_buffer,
258                                                    urb_out->
259                                                    transfer_buffer_length);
260                                 line6_capture_check_period(line6pcm,
261                                         urb_out->transfer_buffer_length);
262                         }
263                 } else {
264                         if (!(line6pcm->line6->properties->capabilities & LINE6_CAP_HWMON)
265                             && line6pcm->out.running && line6pcm->in.running)
266                                 add_monitor_signal(urb_out, line6pcm->prev_fbuf,
267                                                    line6pcm->volume_monitor,
268                                                    bytes_per_frame);
269                 }
270                 line6pcm->prev_fbuf = NULL;
271                 line6pcm->prev_fsize = 0;
272         }
273         spin_unlock(&line6pcm->in.lock);
274 
275         ret = usb_submit_urb(urb_out, GFP_ATOMIC);
276 
277         if (ret == 0)
278                 set_bit(index, &line6pcm->out.active_urbs);
279         else
280                 dev_err(line6pcm->line6->ifcdev,
281                         "URB out #%d submission failed (%d)\n", index, ret);
282 
283         return 0;
284 }
285 
286 /*
287         Submit all currently available playback URBs.
288         must be called in line6pcm->out.lock context
289  */
290 int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
291 {
292         int ret = 0, i;
293 
294         for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
295                 ret = submit_audio_out_urb(line6pcm);
296                 if (ret < 0)
297                         break;
298         }
299 
300         return ret;
301 }
302 
303 /*
304         Callback for completed playback URB.
305 */
306 static void audio_out_callback(struct urb *urb)
307 {
308         int i, index, length = 0, shutdown = 0;
309         unsigned long flags;
310         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
311         struct snd_pcm_substream *substream =
312             get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
313         const int bytes_per_frame =
314                 line6pcm->properties->bytes_per_channel *
315                 line6pcm->properties->playback_hw.channels_max;
316 
317 #if USE_CLEAR_BUFFER_WORKAROUND
318         memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
319 #endif
320 
321         line6pcm->out.last_frame = urb->start_frame;
322 
323         /* find index of URB */
324         for (index = 0; index < line6pcm->line6->iso_buffers; index++)
325                 if (urb == line6pcm->out.urbs[index])
326                         break;
327 
328         if (index >= line6pcm->line6->iso_buffers)
329                 return;         /* URB has been unlinked asynchronously */
330 
331         for (i = 0; i < LINE6_ISO_PACKETS; i++)
332                 length += urb->iso_frame_desc[i].length;
333 
334         spin_lock_irqsave(&line6pcm->out.lock, flags);
335 
336         if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
337                 struct snd_pcm_runtime *runtime = substream->runtime;
338 
339                 line6pcm->out.pos_done +=
340                     length / bytes_per_frame;
341 
342                 if (line6pcm->out.pos_done >= runtime->buffer_size)
343                         line6pcm->out.pos_done -= runtime->buffer_size;
344         }
345 
346         clear_bit(index, &line6pcm->out.active_urbs);
347 
348         for (i = 0; i < LINE6_ISO_PACKETS; i++)
349                 if (urb->iso_frame_desc[i].status == -EXDEV) {
350                         shutdown = 1;
351                         break;
352                 }
353 
354         if (test_and_clear_bit(index, &line6pcm->out.unlink_urbs))
355                 shutdown = 1;
356 
357         if (!shutdown) {
358                 submit_audio_out_urb(line6pcm);
359 
360                 if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
361                         line6pcm->out.bytes += length;
362                         if (line6pcm->out.bytes >= line6pcm->out.period) {
363                                 line6pcm->out.bytes %= line6pcm->out.period;
364                                 spin_unlock(&line6pcm->out.lock);
365                                 snd_pcm_period_elapsed(substream);
366                                 spin_lock(&line6pcm->out.lock);
367                         }
368                 }
369         }
370         spin_unlock_irqrestore(&line6pcm->out.lock, flags);
371 }
372 
373 /* open playback callback */
374 static int snd_line6_playback_open(struct snd_pcm_substream *substream)
375 {
376         int err;
377         struct snd_pcm_runtime *runtime = substream->runtime;
378         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
379 
380         err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
381                                             &line6pcm->properties->rates);
382         if (err < 0)
383                 return err;
384 
385         runtime->hw = line6pcm->properties->playback_hw;
386         return 0;
387 }
388 
389 /* close playback callback */
390 static int snd_line6_playback_close(struct snd_pcm_substream *substream)
391 {
392         return 0;
393 }
394 
395 /* playback operators */
396 const struct snd_pcm_ops snd_line6_playback_ops = {
397         .open = snd_line6_playback_open,
398         .close = snd_line6_playback_close,
399         .ioctl = snd_pcm_lib_ioctl,
400         .hw_params = snd_line6_hw_params,
401         .hw_free = snd_line6_hw_free,
402         .prepare = snd_line6_prepare,
403         .trigger = snd_line6_trigger,
404         .pointer = snd_line6_pointer,
405 };
406 
407 int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
408 {
409         struct usb_line6 *line6 = line6pcm->line6;
410         int i;
411 
412         line6pcm->out.urbs = kzalloc(
413                 sizeof(struct urb *) * line6->iso_buffers, GFP_KERNEL);
414         if (line6pcm->out.urbs == NULL)
415                 return -ENOMEM;
416 
417         /* create audio URBs and fill in constant values: */
418         for (i = 0; i < line6->iso_buffers; ++i) {
419                 struct urb *urb;
420 
421                 /* URB for audio out: */
422                 urb = line6pcm->out.urbs[i] =
423                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
424 
425                 if (urb == NULL)
426                         return -ENOMEM;
427 
428                 urb->dev = line6->usbdev;
429                 urb->pipe =
430                     usb_sndisocpipe(line6->usbdev,
431                                     line6->properties->ep_audio_w &
432                                     USB_ENDPOINT_NUMBER_MASK);
433                 urb->transfer_flags = URB_ISO_ASAP;
434                 urb->start_frame = -1;
435                 urb->number_of_packets = LINE6_ISO_PACKETS;
436                 urb->interval = LINE6_ISO_INTERVAL;
437                 urb->error_count = 0;
438                 urb->complete = audio_out_callback;
439         }
440 
441         return 0;
442 }
443 

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