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TOMOYO Linux Cross Reference
Linux/sound/drivers/vx/vx_pcm.c

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  1 /*
  2  * Driver for Digigram VX soundcards
  3  *
  4  * PCM part
  5  *
  6  * Copyright (c) 2002,2003 by Takashi Iwai <tiwai@suse.de>
  7  *
  8  *   This program is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU General Public License as published by
 10  *   the Free Software Foundation; either version 2 of the License, or
 11  *   (at your option) any later version.
 12  *
 13  *   This program is distributed in the hope that it will be useful,
 14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  *   GNU General Public License for more details.
 17  *
 18  *   You should have received a copy of the GNU General Public License
 19  *   along with this program; if not, write to the Free Software
 20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  *
 22  *
 23  * STRATEGY
 24  *  for playback, we send series of "chunks", which size is equal with the
 25  *  IBL size, typically 126 samples.  at each end of chunk, the end-of-buffer
 26  *  interrupt is notified, and the interrupt handler will feed the next chunk.
 27  *
 28  *  the current position is calculated from the sample count RMH.
 29  *  pipe->transferred is the counter of data which has been already transferred.
 30  *  if this counter reaches to the period size, snd_pcm_period_elapsed() will
 31  *  be issued.
 32  *
 33  *  for capture, the situation is much easier.
 34  *  to get a low latency response, we'll check the capture streams at each
 35  *  interrupt (capture stream has no EOB notification).  if the pending
 36  *  data is accumulated to the period size, snd_pcm_period_elapsed() is
 37  *  called and the pointer is updated.
 38  *
 39  *  the current point of read buffer is kept in pipe->hw_ptr.  note that
 40  *  this is in bytes.
 41  *
 42  *
 43  * TODO
 44  *  - linked trigger for full-duplex mode.
 45  *  - scheduled action on the stream.
 46  */
 47 
 48 #include <linux/slab.h>
 49 #include <linux/delay.h>
 50 #include <sound/core.h>
 51 #include <sound/asoundef.h>
 52 #include <sound/pcm.h>
 53 #include <sound/vx_core.h>
 54 #include "vx_cmd.h"
 55 
 56 
 57 /*
 58  * read three pending pcm bytes via inb()
 59  */
 60 static void vx_pcm_read_per_bytes(struct vx_core *chip, struct snd_pcm_runtime *runtime,
 61                                   struct vx_pipe *pipe)
 62 {
 63         int offset = pipe->hw_ptr;
 64         unsigned char *buf = (unsigned char *)(runtime->dma_area + offset);
 65         *buf++ = vx_inb(chip, RXH);
 66         if (++offset >= pipe->buffer_bytes) {
 67                 offset = 0;
 68                 buf = (unsigned char *)runtime->dma_area;
 69         }
 70         *buf++ = vx_inb(chip, RXM);
 71         if (++offset >= pipe->buffer_bytes) {
 72                 offset = 0;
 73                 buf = (unsigned char *)runtime->dma_area;
 74         }
 75         *buf++ = vx_inb(chip, RXL);
 76         if (++offset >= pipe->buffer_bytes) {
 77                 offset = 0;
 78                 buf = (unsigned char *)runtime->dma_area;
 79         }
 80         pipe->hw_ptr = offset;
 81 }
 82 
 83 /*
 84  * vx_set_pcx_time - convert from the PC time to the RMH status time.
 85  * @pc_time: the pointer for the PC-time to set
 86  * @dsp_time: the pointer for RMH status time array
 87  */
 88 static void vx_set_pcx_time(struct vx_core *chip, pcx_time_t *pc_time,
 89                             unsigned int *dsp_time)
 90 {
 91         dsp_time[0] = (unsigned int)((*pc_time) >> 24) & PCX_TIME_HI_MASK;
 92         dsp_time[1] = (unsigned int)(*pc_time) &  MASK_DSP_WORD;
 93 }
 94 
 95 /*
 96  * vx_set_differed_time - set the differed time if specified
 97  * @rmh: the rmh record to modify
 98  * @pipe: the pipe to be checked
 99  *
100  * if the pipe is programmed with the differed time, set the DSP time
101  * on the rmh and changes its command length.
102  *
103  * returns the increase of the command length.
104  */
105 static int vx_set_differed_time(struct vx_core *chip, struct vx_rmh *rmh,
106                                 struct vx_pipe *pipe)
107 {
108         /* Update The length added to the RMH command by the timestamp */
109         if (! (pipe->differed_type & DC_DIFFERED_DELAY))
110                 return 0;
111                 
112         /* Set the T bit */
113         rmh->Cmd[0] |= DSP_DIFFERED_COMMAND_MASK;
114 
115         /* Time stamp is the 1st following parameter */
116         vx_set_pcx_time(chip, &pipe->pcx_time, &rmh->Cmd[1]);
117 
118         /* Add the flags to a notified differed command */
119         if (pipe->differed_type & DC_NOTIFY_DELAY)
120                 rmh->Cmd[1] |= NOTIFY_MASK_TIME_HIGH ;
121 
122         /* Add the flags to a multiple differed command */
123         if (pipe->differed_type & DC_MULTIPLE_DELAY)
124                 rmh->Cmd[1] |= MULTIPLE_MASK_TIME_HIGH;
125 
126         /* Add the flags to a stream-time differed command */
127         if (pipe->differed_type & DC_STREAM_TIME_DELAY)
128                 rmh->Cmd[1] |= STREAM_MASK_TIME_HIGH;
129                 
130         rmh->LgCmd += 2;
131         return 2;
132 }
133 
134 /*
135  * vx_set_stream_format - send the stream format command
136  * @pipe: the affected pipe
137  * @data: format bitmask
138  */
139 static int vx_set_stream_format(struct vx_core *chip, struct vx_pipe *pipe,
140                                 unsigned int data)
141 {
142         struct vx_rmh rmh;
143 
144         vx_init_rmh(&rmh, pipe->is_capture ?
145                     CMD_FORMAT_STREAM_IN : CMD_FORMAT_STREAM_OUT);
146         rmh.Cmd[0] |= pipe->number << FIELD_SIZE;
147 
148         /* Command might be longer since we may have to add a timestamp */
149         vx_set_differed_time(chip, &rmh, pipe);
150 
151         rmh.Cmd[rmh.LgCmd] = (data & 0xFFFFFF00) >> 8;
152         rmh.Cmd[rmh.LgCmd + 1] = (data & 0xFF) << 16 /*| (datal & 0xFFFF00) >> 8*/;
153         rmh.LgCmd += 2;
154     
155         return vx_send_msg(chip, &rmh);
156 }
157 
158 
159 /*
160  * vx_set_format - set the format of a pipe
161  * @pipe: the affected pipe
162  * @runtime: pcm runtime instance to be referred
163  *
164  * returns 0 if successful, or a negative error code.
165  */
166 static int vx_set_format(struct vx_core *chip, struct vx_pipe *pipe,
167                          struct snd_pcm_runtime *runtime)
168 {
169         unsigned int header = HEADER_FMT_BASE;
170 
171         if (runtime->channels == 1)
172                 header |= HEADER_FMT_MONO;
173         if (snd_pcm_format_little_endian(runtime->format))
174                 header |= HEADER_FMT_INTEL;
175         if (runtime->rate < 32000 && runtime->rate > 11025)
176                 header |= HEADER_FMT_UPTO32;
177         else if (runtime->rate <= 11025)
178                 header |= HEADER_FMT_UPTO11;
179 
180         switch (snd_pcm_format_physical_width(runtime->format)) {
181         // case 8: break;
182         case 16: header |= HEADER_FMT_16BITS; break;
183         case 24: header |= HEADER_FMT_24BITS; break;
184         default : 
185                 snd_BUG();
186                 return -EINVAL;
187         }
188 
189         return vx_set_stream_format(chip, pipe, header);
190 }
191 
192 /*
193  * set / query the IBL size
194  */
195 static int vx_set_ibl(struct vx_core *chip, struct vx_ibl_info *info)
196 {
197         int err;
198         struct vx_rmh rmh;
199 
200         vx_init_rmh(&rmh, CMD_IBL);
201         rmh.Cmd[0] |= info->size & 0x03ffff;
202         err = vx_send_msg(chip, &rmh);
203         if (err < 0)
204                 return err;
205         info->size = rmh.Stat[0];
206         info->max_size = rmh.Stat[1];
207         info->min_size = rmh.Stat[2];
208         info->granularity = rmh.Stat[3];
209         snd_printdd(KERN_DEBUG "vx_set_ibl: size = %d, max = %d, min = %d, gran = %d\n",
210                    info->size, info->max_size, info->min_size, info->granularity);
211         return 0;
212 }
213 
214 
215 /*
216  * vx_get_pipe_state - get the state of a pipe
217  * @pipe: the pipe to be checked
218  * @state: the pointer for the returned state
219  *
220  * checks the state of a given pipe, and stores the state (1 = running,
221  * 0 = paused) on the given pointer.
222  *
223  * called from trigger callback only
224  */
225 static int vx_get_pipe_state(struct vx_core *chip, struct vx_pipe *pipe, int *state)
226 {
227         int err;
228         struct vx_rmh rmh;
229 
230         vx_init_rmh(&rmh, CMD_PIPE_STATE);
231         vx_set_pipe_cmd_params(&rmh, pipe->is_capture, pipe->number, 0);
232         err = vx_send_msg(chip, &rmh);
233         if (! err)
234                 *state = (rmh.Stat[0] & (1 << pipe->number)) ? 1 : 0;
235         return err;
236 }
237 
238 
239 /*
240  * vx_query_hbuffer_size - query available h-buffer size in bytes
241  * @pipe: the pipe to be checked
242  *
243  * return the available size on h-buffer in bytes,
244  * or a negative error code.
245  *
246  * NOTE: calling this function always switches to the stream mode.
247  *       you'll need to disconnect the host to get back to the
248  *       normal mode.
249  */
250 static int vx_query_hbuffer_size(struct vx_core *chip, struct vx_pipe *pipe)
251 {
252         int result;
253         struct vx_rmh rmh;
254 
255         vx_init_rmh(&rmh, CMD_SIZE_HBUFFER);
256         vx_set_pipe_cmd_params(&rmh, pipe->is_capture, pipe->number, 0);
257         if (pipe->is_capture)
258                 rmh.Cmd[0] |= 0x00000001;
259         result = vx_send_msg(chip, &rmh);
260         if (! result)
261                 result = rmh.Stat[0] & 0xffff;
262         return result;
263 }
264 
265 
266 /*
267  * vx_pipe_can_start - query whether a pipe is ready for start
268  * @pipe: the pipe to be checked
269  *
270  * return 1 if ready, 0 if not ready, and negative value on error.
271  *
272  * called from trigger callback only
273  */
274 static int vx_pipe_can_start(struct vx_core *chip, struct vx_pipe *pipe)
275 {
276         int err;
277         struct vx_rmh rmh;
278         
279         vx_init_rmh(&rmh, CMD_CAN_START_PIPE);
280         vx_set_pipe_cmd_params(&rmh, pipe->is_capture, pipe->number, 0);
281         rmh.Cmd[0] |= 1;
282 
283         err = vx_send_msg(chip, &rmh);
284         if (! err) {
285                 if (rmh.Stat[0])
286                         err = 1;
287         }
288         return err;
289 }
290 
291 /*
292  * vx_conf_pipe - tell the pipe to stand by and wait for IRQA.
293  * @pipe: the pipe to be configured
294  */
295 static int vx_conf_pipe(struct vx_core *chip, struct vx_pipe *pipe)
296 {
297         struct vx_rmh rmh;
298 
299         vx_init_rmh(&rmh, CMD_CONF_PIPE);
300         if (pipe->is_capture)
301                 rmh.Cmd[0] |= COMMAND_RECORD_MASK;
302         rmh.Cmd[1] = 1 << pipe->number;
303         return vx_send_msg(chip, &rmh);
304 }
305 
306 /*
307  * vx_send_irqa - trigger IRQA
308  */
309 static int vx_send_irqa(struct vx_core *chip)
310 {
311         struct vx_rmh rmh;
312 
313         vx_init_rmh(&rmh, CMD_SEND_IRQA);
314         return vx_send_msg(chip, &rmh);
315 }
316 
317 
318 #define MAX_WAIT_FOR_DSP        250
319 /*
320  * vx boards do not support inter-card sync, besides
321  * only 126 samples require to be prepared before a pipe can start
322  */
323 #define CAN_START_DELAY         2       /* wait 2ms only before asking if the pipe is ready*/
324 #define WAIT_STATE_DELAY        2       /* wait 2ms after irqA was requested and check if the pipe state toggled*/
325 
326 /*
327  * vx_toggle_pipe - start / pause a pipe
328  * @pipe: the pipe to be triggered
329  * @state: start = 1, pause = 0
330  *
331  * called from trigger callback only
332  *
333  */
334 static int vx_toggle_pipe(struct vx_core *chip, struct vx_pipe *pipe, int state)
335 {
336         int err, i, cur_state;
337 
338         /* Check the pipe is not already in the requested state */
339         if (vx_get_pipe_state(chip, pipe, &cur_state) < 0)
340                 return -EBADFD;
341         if (state == cur_state)
342                 return 0;
343 
344         /* If a start is requested, ask the DSP to get prepared
345          * and wait for a positive acknowledge (when there are
346          * enough sound buffer for this pipe)
347          */
348         if (state) {
349                 for (i = 0 ; i < MAX_WAIT_FOR_DSP; i++) {
350                         err = vx_pipe_can_start(chip, pipe);
351                         if (err > 0)
352                                 break;
353                         /* Wait for a few, before asking again
354                          * to avoid flooding the DSP with our requests
355                          */
356                         mdelay(1);
357                 }
358         }
359     
360         if ((err = vx_conf_pipe(chip, pipe)) < 0)
361                 return err;
362 
363         if ((err = vx_send_irqa(chip)) < 0)
364                 return err;
365     
366         /* If it completes successfully, wait for the pipes
367          * reaching the expected state before returning
368          * Check one pipe only (since they are synchronous)
369          */
370         for (i = 0; i < MAX_WAIT_FOR_DSP; i++) {
371                 err = vx_get_pipe_state(chip, pipe, &cur_state);
372                 if (err < 0 || cur_state == state)
373                         break;
374                 err = -EIO;
375                 mdelay(1);
376         }
377         return err < 0 ? -EIO : 0;
378 }
379 
380     
381 /*
382  * vx_stop_pipe - stop a pipe
383  * @pipe: the pipe to be stopped
384  *
385  * called from trigger callback only
386  */
387 static int vx_stop_pipe(struct vx_core *chip, struct vx_pipe *pipe)
388 {
389         struct vx_rmh rmh;
390         vx_init_rmh(&rmh, CMD_STOP_PIPE);
391         vx_set_pipe_cmd_params(&rmh, pipe->is_capture, pipe->number, 0);
392         return vx_send_msg(chip, &rmh);
393 }
394 
395 
396 /*
397  * vx_alloc_pipe - allocate a pipe and initialize the pipe instance
398  * @capture: 0 = playback, 1 = capture operation
399  * @audioid: the audio id to be assigned
400  * @num_audio: number of audio channels
401  * @pipep: the returned pipe instance
402  *
403  * return 0 on success, or a negative error code.
404  */
405 static int vx_alloc_pipe(struct vx_core *chip, int capture,
406                          int audioid, int num_audio,
407                          struct vx_pipe **pipep)
408 {
409         int err;
410         struct vx_pipe *pipe;
411         struct vx_rmh rmh;
412         int data_mode;
413 
414         *pipep = NULL;
415         vx_init_rmh(&rmh, CMD_RES_PIPE);
416         vx_set_pipe_cmd_params(&rmh, capture, audioid, num_audio);
417 #if 0   // NYI
418         if (underrun_skip_sound)
419                 rmh.Cmd[0] |= BIT_SKIP_SOUND;
420 #endif  // NYI
421         data_mode = (chip->uer_bits & IEC958_AES0_NONAUDIO) != 0;
422         if (! capture && data_mode)
423                 rmh.Cmd[0] |= BIT_DATA_MODE;
424         err = vx_send_msg(chip, &rmh);
425         if (err < 0)
426                 return err;
427 
428         /* initialize the pipe record */
429         pipe = kzalloc(sizeof(*pipe), GFP_KERNEL);
430         if (! pipe) {
431                 /* release the pipe */
432                 vx_init_rmh(&rmh, CMD_FREE_PIPE);
433                 vx_set_pipe_cmd_params(&rmh, capture, audioid, 0);
434                 vx_send_msg(chip, &rmh);
435                 return -ENOMEM;
436         }
437 
438         /* the pipe index should be identical with the audio index */
439         pipe->number = audioid;
440         pipe->is_capture = capture;
441         pipe->channels = num_audio;
442         pipe->differed_type = 0;
443         pipe->pcx_time = 0;
444         pipe->data_mode = data_mode;
445         *pipep = pipe;
446 
447         return 0;
448 }
449 
450 
451 /*
452  * vx_free_pipe - release a pipe
453  * @pipe: pipe to be released
454  */
455 static int vx_free_pipe(struct vx_core *chip, struct vx_pipe *pipe)
456 {
457         struct vx_rmh rmh;
458 
459         vx_init_rmh(&rmh, CMD_FREE_PIPE);
460         vx_set_pipe_cmd_params(&rmh, pipe->is_capture, pipe->number, 0);
461         vx_send_msg(chip, &rmh);
462 
463         kfree(pipe);
464         return 0;
465 }
466 
467 
468 /*
469  * vx_start_stream - start the stream
470  *
471  * called from trigger callback only
472  */
473 static int vx_start_stream(struct vx_core *chip, struct vx_pipe *pipe)
474 {
475         struct vx_rmh rmh;
476 
477         vx_init_rmh(&rmh, CMD_START_ONE_STREAM);
478         vx_set_stream_cmd_params(&rmh, pipe->is_capture, pipe->number);
479         vx_set_differed_time(chip, &rmh, pipe);
480         return vx_send_msg(chip, &rmh);
481 }
482 
483 
484 /*
485  * vx_stop_stream - stop the stream
486  *
487  * called from trigger callback only
488  */
489 static int vx_stop_stream(struct vx_core *chip, struct vx_pipe *pipe)
490 {
491         struct vx_rmh rmh;
492 
493         vx_init_rmh(&rmh, CMD_STOP_STREAM);
494         vx_set_stream_cmd_params(&rmh, pipe->is_capture, pipe->number);
495         return vx_send_msg(chip, &rmh);
496 }
497 
498 
499 /*
500  * playback hw information
501  */
502 
503 static struct snd_pcm_hardware vx_pcm_playback_hw = {
504         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
505                                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP_VALID /*|*/
506                                  /*SNDRV_PCM_INFO_RESUME*/),
507         .formats =              (/*SNDRV_PCM_FMTBIT_U8 |*/
508                                  SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE),
509         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
510         .rate_min =             5000,
511         .rate_max =             48000,
512         .channels_min =         1,
513         .channels_max =         2,
514         .buffer_bytes_max =     (128*1024),
515         .period_bytes_min =     126,
516         .period_bytes_max =     (128*1024),
517         .periods_min =          2,
518         .periods_max =          VX_MAX_PERIODS,
519         .fifo_size =            126,
520 };
521 
522 
523 /*
524  * vx_pcm_playback_open - open callback for playback
525  */
526 static int vx_pcm_playback_open(struct snd_pcm_substream *subs)
527 {
528         struct snd_pcm_runtime *runtime = subs->runtime;
529         struct vx_core *chip = snd_pcm_substream_chip(subs);
530         struct vx_pipe *pipe = NULL;
531         unsigned int audio;
532         int err;
533 
534         if (chip->chip_status & VX_STAT_IS_STALE)
535                 return -EBUSY;
536 
537         audio = subs->pcm->device * 2;
538         if (snd_BUG_ON(audio >= chip->audio_outs))
539                 return -EINVAL;
540         
541         /* playback pipe may have been already allocated for monitoring */
542         pipe = chip->playback_pipes[audio];
543         if (! pipe) {
544                 /* not allocated yet */
545                 err = vx_alloc_pipe(chip, 0, audio, 2, &pipe); /* stereo playback */
546                 if (err < 0)
547                         return err;
548                 chip->playback_pipes[audio] = pipe;
549         }
550         /* open for playback */
551         pipe->references++;
552 
553         pipe->substream = subs;
554         chip->playback_pipes[audio] = pipe;
555 
556         runtime->hw = vx_pcm_playback_hw;
557         runtime->hw.period_bytes_min = chip->ibl.size;
558         runtime->private_data = pipe;
559 
560         /* align to 4 bytes (otherwise will be problematic when 24bit is used) */ 
561         snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 4);
562         snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
563 
564         return 0;
565 }
566 
567 /*
568  * vx_pcm_playback_close - close callback for playback
569  */
570 static int vx_pcm_playback_close(struct snd_pcm_substream *subs)
571 {
572         struct vx_core *chip = snd_pcm_substream_chip(subs);
573         struct vx_pipe *pipe;
574 
575         if (! subs->runtime->private_data)
576                 return -EINVAL;
577 
578         pipe = subs->runtime->private_data;
579 
580         if (--pipe->references == 0) {
581                 chip->playback_pipes[pipe->number] = NULL;
582                 vx_free_pipe(chip, pipe);
583         }
584 
585         return 0;
586 
587 }
588 
589 
590 /*
591  * vx_notify_end_of_buffer - send "end-of-buffer" notifier at the given pipe
592  * @pipe: the pipe to notify
593  *
594  * NB: call with a certain lock.
595  */
596 static int vx_notify_end_of_buffer(struct vx_core *chip, struct vx_pipe *pipe)
597 {
598         int err;
599         struct vx_rmh rmh;  /* use a temporary rmh here */
600 
601         /* Toggle Dsp Host Interface into Message mode */
602         vx_send_rih_nolock(chip, IRQ_PAUSE_START_CONNECT);
603         vx_init_rmh(&rmh, CMD_NOTIFY_END_OF_BUFFER);
604         vx_set_stream_cmd_params(&rmh, 0, pipe->number);
605         err = vx_send_msg_nolock(chip, &rmh);
606         if (err < 0)
607                 return err;
608         /* Toggle Dsp Host Interface back to sound transfer mode */
609         vx_send_rih_nolock(chip, IRQ_PAUSE_START_CONNECT);
610         return 0;
611 }
612 
613 /*
614  * vx_pcm_playback_transfer_chunk - transfer a single chunk
615  * @subs: substream
616  * @pipe: the pipe to transfer
617  * @size: chunk size in bytes
618  *
619  * transfer a single buffer chunk.  EOB notificaton is added after that.
620  * called from the interrupt handler, too.
621  *
622  * return 0 if ok.
623  */
624 static int vx_pcm_playback_transfer_chunk(struct vx_core *chip,
625                                           struct snd_pcm_runtime *runtime,
626                                           struct vx_pipe *pipe, int size)
627 {
628         int space, err = 0;
629 
630         space = vx_query_hbuffer_size(chip, pipe);
631         if (space < 0) {
632                 /* disconnect the host, SIZE_HBUF command always switches to the stream mode */
633                 vx_send_rih(chip, IRQ_CONNECT_STREAM_NEXT);
634                 snd_printd("error hbuffer\n");
635                 return space;
636         }
637         if (space < size) {
638                 vx_send_rih(chip, IRQ_CONNECT_STREAM_NEXT);
639                 snd_printd("no enough hbuffer space %d\n", space);
640                 return -EIO; /* XRUN */
641         }
642                 
643         /* we don't need irqsave here, because this function
644          * is called from either trigger callback or irq handler
645          */
646         mutex_lock(&chip->lock);
647         vx_pseudo_dma_write(chip, runtime, pipe, size);
648         err = vx_notify_end_of_buffer(chip, pipe);
649         /* disconnect the host, SIZE_HBUF command always switches to the stream mode */
650         vx_send_rih_nolock(chip, IRQ_CONNECT_STREAM_NEXT);
651         mutex_unlock(&chip->lock);
652         return err;
653 }
654 
655 /*
656  * update the position of the given pipe.
657  * pipe->position is updated and wrapped within the buffer size.
658  * pipe->transferred is updated, too, but the size is not wrapped,
659  * so that the caller can check the total transferred size later
660  * (to call snd_pcm_period_elapsed).
661  */
662 static int vx_update_pipe_position(struct vx_core *chip,
663                                    struct snd_pcm_runtime *runtime,
664                                    struct vx_pipe *pipe)
665 {
666         struct vx_rmh rmh;
667         int err, update;
668         u64 count;
669 
670         vx_init_rmh(&rmh, CMD_STREAM_SAMPLE_COUNT);
671         vx_set_pipe_cmd_params(&rmh, pipe->is_capture, pipe->number, 0);
672         err = vx_send_msg(chip, &rmh);
673         if (err < 0)
674                 return err;
675 
676         count = ((u64)(rmh.Stat[0] & 0xfffff) << 24) | (u64)rmh.Stat[1];
677         update = (int)(count - pipe->cur_count);
678         pipe->cur_count = count;
679         pipe->position += update;
680         if (pipe->position >= (int)runtime->buffer_size)
681                 pipe->position %= runtime->buffer_size;
682         pipe->transferred += update;
683         return 0;
684 }
685 
686 /*
687  * transfer the pending playback buffer data to DSP
688  * called from interrupt handler
689  */
690 static void vx_pcm_playback_transfer(struct vx_core *chip,
691                                      struct snd_pcm_substream *subs,
692                                      struct vx_pipe *pipe, int nchunks)
693 {
694         int i, err;
695         struct snd_pcm_runtime *runtime = subs->runtime;
696 
697         if (! pipe->prepared || (chip->chip_status & VX_STAT_IS_STALE))
698                 return;
699         for (i = 0; i < nchunks; i++) {
700                 if ((err = vx_pcm_playback_transfer_chunk(chip, runtime, pipe,
701                                                           chip->ibl.size)) < 0)
702                         return;
703         }
704 }
705 
706 /*
707  * update the playback position and call snd_pcm_period_elapsed() if necessary
708  * called from interrupt handler
709  */
710 static void vx_pcm_playback_update(struct vx_core *chip,
711                                    struct snd_pcm_substream *subs,
712                                    struct vx_pipe *pipe)
713 {
714         int err;
715         struct snd_pcm_runtime *runtime = subs->runtime;
716 
717         if (pipe->running && ! (chip->chip_status & VX_STAT_IS_STALE)) {
718                 if ((err = vx_update_pipe_position(chip, runtime, pipe)) < 0)
719                         return;
720                 if (pipe->transferred >= (int)runtime->period_size) {
721                         pipe->transferred %= runtime->period_size;
722                         snd_pcm_period_elapsed(subs);
723                 }
724         }
725 }
726 
727 /*
728  * vx_pcm_playback_trigger - trigger callback for playback
729  */
730 static int vx_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
731 {
732         struct vx_core *chip = snd_pcm_substream_chip(subs);
733         struct vx_pipe *pipe = subs->runtime->private_data;
734         int err;
735 
736         if (chip->chip_status & VX_STAT_IS_STALE)
737                 return -EBUSY;
738                 
739         switch (cmd) {
740         case SNDRV_PCM_TRIGGER_START:
741         case SNDRV_PCM_TRIGGER_RESUME:
742                 if (! pipe->is_capture)
743                         vx_pcm_playback_transfer(chip, subs, pipe, 2);
744                 err = vx_start_stream(chip, pipe);
745                 if (err < 0) {
746                         pr_debug("vx: cannot start stream\n");
747                         return err;
748                 }
749                 err = vx_toggle_pipe(chip, pipe, 1);
750                 if (err < 0) {
751                         pr_debug("vx: cannot start pipe\n");
752                         vx_stop_stream(chip, pipe);
753                         return err;
754                 }
755                 chip->pcm_running++;
756                 pipe->running = 1;
757                 break;
758         case SNDRV_PCM_TRIGGER_STOP:
759         case SNDRV_PCM_TRIGGER_SUSPEND:
760                 vx_toggle_pipe(chip, pipe, 0);
761                 vx_stop_pipe(chip, pipe);
762                 vx_stop_stream(chip, pipe);
763                 chip->pcm_running--;
764                 pipe->running = 0;
765                 break;
766         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
767                 if ((err = vx_toggle_pipe(chip, pipe, 0)) < 0)
768                         return err;
769                 break;
770         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
771                 if ((err = vx_toggle_pipe(chip, pipe, 1)) < 0)
772                         return err;
773                 break;
774         default:
775                 return -EINVAL;
776         }
777         return 0;
778 }
779 
780 /*
781  * vx_pcm_playback_pointer - pointer callback for playback
782  */
783 static snd_pcm_uframes_t vx_pcm_playback_pointer(struct snd_pcm_substream *subs)
784 {
785         struct snd_pcm_runtime *runtime = subs->runtime;
786         struct vx_pipe *pipe = runtime->private_data;
787         return pipe->position;
788 }
789 
790 /*
791  * vx_pcm_hw_params - hw_params callback for playback and capture
792  */
793 static int vx_pcm_hw_params(struct snd_pcm_substream *subs,
794                                      struct snd_pcm_hw_params *hw_params)
795 {
796         return snd_pcm_lib_alloc_vmalloc_32_buffer
797                                         (subs, params_buffer_bytes(hw_params));
798 }
799 
800 /*
801  * vx_pcm_hw_free - hw_free callback for playback and capture
802  */
803 static int vx_pcm_hw_free(struct snd_pcm_substream *subs)
804 {
805         return snd_pcm_lib_free_vmalloc_buffer(subs);
806 }
807 
808 /*
809  * vx_pcm_prepare - prepare callback for playback and capture
810  */
811 static int vx_pcm_prepare(struct snd_pcm_substream *subs)
812 {
813         struct vx_core *chip = snd_pcm_substream_chip(subs);
814         struct snd_pcm_runtime *runtime = subs->runtime;
815         struct vx_pipe *pipe = runtime->private_data;
816         int err, data_mode;
817         // int max_size, nchunks;
818 
819         if (chip->chip_status & VX_STAT_IS_STALE)
820                 return -EBUSY;
821 
822         data_mode = (chip->uer_bits & IEC958_AES0_NONAUDIO) != 0;
823         if (data_mode != pipe->data_mode && ! pipe->is_capture) {
824                 /* IEC958 status (raw-mode) was changed */
825                 /* we reopen the pipe */
826                 struct vx_rmh rmh;
827                 snd_printdd(KERN_DEBUG "reopen the pipe with data_mode = %d\n", data_mode);
828                 vx_init_rmh(&rmh, CMD_FREE_PIPE);
829                 vx_set_pipe_cmd_params(&rmh, 0, pipe->number, 0);
830                 if ((err = vx_send_msg(chip, &rmh)) < 0)
831                         return err;
832                 vx_init_rmh(&rmh, CMD_RES_PIPE);
833                 vx_set_pipe_cmd_params(&rmh, 0, pipe->number, pipe->channels);
834                 if (data_mode)
835                         rmh.Cmd[0] |= BIT_DATA_MODE;
836                 if ((err = vx_send_msg(chip, &rmh)) < 0)
837                         return err;
838                 pipe->data_mode = data_mode;
839         }
840 
841         if (chip->pcm_running && chip->freq != runtime->rate) {
842                 snd_printk(KERN_ERR "vx: cannot set different clock %d "
843                            "from the current %d\n", runtime->rate, chip->freq);
844                 return -EINVAL;
845         }
846         vx_set_clock(chip, runtime->rate);
847 
848         if ((err = vx_set_format(chip, pipe, runtime)) < 0)
849                 return err;
850 
851         if (vx_is_pcmcia(chip)) {
852                 pipe->align = 2; /* 16bit word */
853         } else {
854                 pipe->align = 4; /* 32bit word */
855         }
856 
857         pipe->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
858         pipe->period_bytes = frames_to_bytes(runtime, runtime->period_size);
859         pipe->hw_ptr = 0;
860 
861         /* set the timestamp */
862         vx_update_pipe_position(chip, runtime, pipe);
863         /* clear again */
864         pipe->transferred = 0;
865         pipe->position = 0;
866 
867         pipe->prepared = 1;
868 
869         return 0;
870 }
871 
872 
873 /*
874  * operators for PCM playback
875  */
876 static struct snd_pcm_ops vx_pcm_playback_ops = {
877         .open =         vx_pcm_playback_open,
878         .close =        vx_pcm_playback_close,
879         .ioctl =        snd_pcm_lib_ioctl,
880         .hw_params =    vx_pcm_hw_params,
881         .hw_free =      vx_pcm_hw_free,
882         .prepare =      vx_pcm_prepare,
883         .trigger =      vx_pcm_trigger,
884         .pointer =      vx_pcm_playback_pointer,
885         .page =         snd_pcm_lib_get_vmalloc_page,
886         .mmap =         snd_pcm_lib_mmap_vmalloc,
887 };
888 
889 
890 /*
891  * playback hw information
892  */
893 
894 static struct snd_pcm_hardware vx_pcm_capture_hw = {
895         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
896                                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP_VALID /*|*/
897                                  /*SNDRV_PCM_INFO_RESUME*/),
898         .formats =              (/*SNDRV_PCM_FMTBIT_U8 |*/
899                                  SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE),
900         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
901         .rate_min =             5000,
902         .rate_max =             48000,
903         .channels_min =         1,
904         .channels_max =         2,
905         .buffer_bytes_max =     (128*1024),
906         .period_bytes_min =     126,
907         .period_bytes_max =     (128*1024),
908         .periods_min =          2,
909         .periods_max =          VX_MAX_PERIODS,
910         .fifo_size =            126,
911 };
912 
913 
914 /*
915  * vx_pcm_capture_open - open callback for capture
916  */
917 static int vx_pcm_capture_open(struct snd_pcm_substream *subs)
918 {
919         struct snd_pcm_runtime *runtime = subs->runtime;
920         struct vx_core *chip = snd_pcm_substream_chip(subs);
921         struct vx_pipe *pipe;
922         struct vx_pipe *pipe_out_monitoring = NULL;
923         unsigned int audio;
924         int err;
925 
926         if (chip->chip_status & VX_STAT_IS_STALE)
927                 return -EBUSY;
928 
929         audio = subs->pcm->device * 2;
930         if (snd_BUG_ON(audio >= chip->audio_ins))
931                 return -EINVAL;
932         err = vx_alloc_pipe(chip, 1, audio, 2, &pipe);
933         if (err < 0)
934                 return err;
935         pipe->substream = subs;
936         chip->capture_pipes[audio] = pipe;
937 
938         /* check if monitoring is needed */
939         if (chip->audio_monitor_active[audio]) {
940                 pipe_out_monitoring = chip->playback_pipes[audio];
941                 if (! pipe_out_monitoring) {
942                         /* allocate a pipe */
943                         err = vx_alloc_pipe(chip, 0, audio, 2, &pipe_out_monitoring);
944                         if (err < 0)
945                                 return err;
946                         chip->playback_pipes[audio] = pipe_out_monitoring;
947                 }
948                 pipe_out_monitoring->references++;
949                 /* 
950                    if an output pipe is available, it's audios still may need to be 
951                    unmuted. hence we'll have to call a mixer entry point.
952                 */
953                 vx_set_monitor_level(chip, audio, chip->audio_monitor[audio],
954                                      chip->audio_monitor_active[audio]);
955                 /* assuming stereo */
956                 vx_set_monitor_level(chip, audio+1, chip->audio_monitor[audio+1],
957                                      chip->audio_monitor_active[audio+1]); 
958         }
959 
960         pipe->monitoring_pipe = pipe_out_monitoring; /* default value NULL */
961 
962         runtime->hw = vx_pcm_capture_hw;
963         runtime->hw.period_bytes_min = chip->ibl.size;
964         runtime->private_data = pipe;
965 
966         /* align to 4 bytes (otherwise will be problematic when 24bit is used) */ 
967         snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 4);
968         snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
969 
970         return 0;
971 }
972 
973 /*
974  * vx_pcm_capture_close - close callback for capture
975  */
976 static int vx_pcm_capture_close(struct snd_pcm_substream *subs)
977 {
978         struct vx_core *chip = snd_pcm_substream_chip(subs);
979         struct vx_pipe *pipe;
980         struct vx_pipe *pipe_out_monitoring;
981         
982         if (! subs->runtime->private_data)
983                 return -EINVAL;
984         pipe = subs->runtime->private_data;
985         chip->capture_pipes[pipe->number] = NULL;
986 
987         pipe_out_monitoring = pipe->monitoring_pipe;
988 
989         /*
990           if an output pipe is attached to this input, 
991           check if it needs to be released.
992         */
993         if (pipe_out_monitoring) {
994                 if (--pipe_out_monitoring->references == 0) {
995                         vx_free_pipe(chip, pipe_out_monitoring);
996                         chip->playback_pipes[pipe->number] = NULL;
997                         pipe->monitoring_pipe = NULL;
998                 }
999         }
1000         
1001         vx_free_pipe(chip, pipe);
1002         return 0;
1003 }
1004 
1005 
1006 
1007 #define DMA_READ_ALIGN  6       /* hardware alignment for read */
1008 
1009 /*
1010  * vx_pcm_capture_update - update the capture buffer
1011  */
1012 static void vx_pcm_capture_update(struct vx_core *chip, struct snd_pcm_substream *subs,
1013                                   struct vx_pipe *pipe)
1014 {
1015         int size, space, count;
1016         struct snd_pcm_runtime *runtime = subs->runtime;
1017 
1018         if (! pipe->prepared || (chip->chip_status & VX_STAT_IS_STALE))
1019                 return;
1020 
1021         size = runtime->buffer_size - snd_pcm_capture_avail(runtime);
1022         if (! size)
1023                 return;
1024         size = frames_to_bytes(runtime, size);
1025         space = vx_query_hbuffer_size(chip, pipe);
1026         if (space < 0)
1027                 goto _error;
1028         if (size > space)
1029                 size = space;
1030         size = (size / 3) * 3; /* align to 3 bytes */
1031         if (size < DMA_READ_ALIGN)
1032                 goto _error;
1033 
1034         /* keep the last 6 bytes, they will be read after disconnection */
1035         count = size - DMA_READ_ALIGN;
1036         /* read bytes until the current pointer reaches to the aligned position
1037          * for word-transfer
1038          */
1039         while (count > 0) {
1040                 if ((pipe->hw_ptr % pipe->align) == 0)
1041                         break;
1042                 if (vx_wait_for_rx_full(chip) < 0)
1043                         goto _error;
1044                 vx_pcm_read_per_bytes(chip, runtime, pipe);
1045                 count -= 3;
1046         }
1047         if (count > 0) {
1048                 /* ok, let's accelerate! */
1049                 int align = pipe->align * 3;
1050                 space = (count / align) * align;
1051                 vx_pseudo_dma_read(chip, runtime, pipe, space);
1052                 count -= space;
1053         }
1054         /* read the rest of bytes */
1055         while (count > 0) {
1056                 if (vx_wait_for_rx_full(chip) < 0)
1057                         goto _error;
1058                 vx_pcm_read_per_bytes(chip, runtime, pipe);
1059                 count -= 3;
1060         }
1061         /* disconnect the host, SIZE_HBUF command always switches to the stream mode */
1062         vx_send_rih(chip, IRQ_CONNECT_STREAM_NEXT);
1063         /* read the last pending 6 bytes */
1064         count = DMA_READ_ALIGN;
1065         while (count > 0) {
1066                 vx_pcm_read_per_bytes(chip, runtime, pipe);
1067                 count -= 3;
1068         }
1069         /* update the position */
1070         pipe->transferred += size;
1071         if (pipe->transferred >= pipe->period_bytes) {
1072                 pipe->transferred %= pipe->period_bytes;
1073                 snd_pcm_period_elapsed(subs);
1074         }
1075         return;
1076 
1077  _error:
1078         /* disconnect the host, SIZE_HBUF command always switches to the stream mode */
1079         vx_send_rih(chip, IRQ_CONNECT_STREAM_NEXT);
1080         return;
1081 }
1082 
1083 /*
1084  * vx_pcm_capture_pointer - pointer callback for capture
1085  */
1086 static snd_pcm_uframes_t vx_pcm_capture_pointer(struct snd_pcm_substream *subs)
1087 {
1088         struct snd_pcm_runtime *runtime = subs->runtime;
1089         struct vx_pipe *pipe = runtime->private_data;
1090         return bytes_to_frames(runtime, pipe->hw_ptr);
1091 }
1092 
1093 /*
1094  * operators for PCM capture
1095  */
1096 static struct snd_pcm_ops vx_pcm_capture_ops = {
1097         .open =         vx_pcm_capture_open,
1098         .close =        vx_pcm_capture_close,
1099         .ioctl =        snd_pcm_lib_ioctl,
1100         .hw_params =    vx_pcm_hw_params,
1101         .hw_free =      vx_pcm_hw_free,
1102         .prepare =      vx_pcm_prepare,
1103         .trigger =      vx_pcm_trigger,
1104         .pointer =      vx_pcm_capture_pointer,
1105         .page =         snd_pcm_lib_get_vmalloc_page,
1106         .mmap =         snd_pcm_lib_mmap_vmalloc,
1107 };
1108 
1109 
1110 /*
1111  * interrupt handler for pcm streams
1112  */
1113 void vx_pcm_update_intr(struct vx_core *chip, unsigned int events)
1114 {
1115         unsigned int i;
1116         struct vx_pipe *pipe;
1117 
1118 #define EVENT_MASK      (END_OF_BUFFER_EVENTS_PENDING|ASYNC_EVENTS_PENDING)
1119 
1120         if (events & EVENT_MASK) {
1121                 vx_init_rmh(&chip->irq_rmh, CMD_ASYNC);
1122                 if (events & ASYNC_EVENTS_PENDING)
1123                         chip->irq_rmh.Cmd[0] |= 0x00000001;     /* SEL_ASYNC_EVENTS */
1124                 if (events & END_OF_BUFFER_EVENTS_PENDING)
1125                         chip->irq_rmh.Cmd[0] |= 0x00000002;     /* SEL_END_OF_BUF_EVENTS */
1126 
1127                 if (vx_send_msg(chip, &chip->irq_rmh) < 0) {
1128                         snd_printdd(KERN_ERR "msg send error!!\n");
1129                         return;
1130                 }
1131 
1132                 i = 1;
1133                 while (i < chip->irq_rmh.LgStat) {
1134                         int p, buf, capture, eob;
1135                         p = chip->irq_rmh.Stat[i] & MASK_FIRST_FIELD;
1136                         capture = (chip->irq_rmh.Stat[i] & 0x400000) ? 1 : 0;
1137                         eob = (chip->irq_rmh.Stat[i] & 0x800000) ? 1 : 0;
1138                         i++;
1139                         if (events & ASYNC_EVENTS_PENDING)
1140                                 i++;
1141                         buf = 1; /* force to transfer */
1142                         if (events & END_OF_BUFFER_EVENTS_PENDING) {
1143                                 if (eob)
1144                                         buf = chip->irq_rmh.Stat[i];
1145                                 i++;
1146                         }
1147                         if (capture)
1148                                 continue;
1149                         if (snd_BUG_ON(p < 0 || p >= chip->audio_outs))
1150                                 continue;
1151                         pipe = chip->playback_pipes[p];
1152                         if (pipe && pipe->substream) {
1153                                 vx_pcm_playback_update(chip, pipe->substream, pipe);
1154                                 vx_pcm_playback_transfer(chip, pipe->substream, pipe, buf);
1155                         }
1156                 }
1157         }
1158 
1159         /* update the capture pcm pointers as frequently as possible */
1160         for (i = 0; i < chip->audio_ins; i++) {
1161                 pipe = chip->capture_pipes[i];
1162                 if (pipe && pipe->substream)
1163                         vx_pcm_capture_update(chip, pipe->substream, pipe);
1164         }
1165 }
1166 
1167 
1168 /*
1169  * vx_init_audio_io - check the available audio i/o and allocate pipe arrays
1170  */
1171 static int vx_init_audio_io(struct vx_core *chip)
1172 {
1173         struct vx_rmh rmh;
1174         int preferred;
1175 
1176         vx_init_rmh(&rmh, CMD_SUPPORTED);
1177         if (vx_send_msg(chip, &rmh) < 0) {
1178                 snd_printk(KERN_ERR "vx: cannot get the supported audio data\n");
1179                 return -ENXIO;
1180         }
1181 
1182         chip->audio_outs = rmh.Stat[0] & MASK_FIRST_FIELD;
1183         chip->audio_ins = (rmh.Stat[0] >> (FIELD_SIZE*2)) & MASK_FIRST_FIELD;
1184         chip->audio_info = rmh.Stat[1];
1185 
1186         /* allocate pipes */
1187         chip->playback_pipes = kcalloc(chip->audio_outs, sizeof(struct vx_pipe *), GFP_KERNEL);
1188         if (!chip->playback_pipes)
1189                 return -ENOMEM;
1190         chip->capture_pipes = kcalloc(chip->audio_ins, sizeof(struct vx_pipe *), GFP_KERNEL);
1191         if (!chip->capture_pipes) {
1192                 kfree(chip->playback_pipes);
1193                 return -ENOMEM;
1194         }
1195 
1196         preferred = chip->ibl.size;
1197         chip->ibl.size = 0;
1198         vx_set_ibl(chip, &chip->ibl); /* query the info */
1199         if (preferred > 0) {
1200                 chip->ibl.size = ((preferred + chip->ibl.granularity - 1) /
1201                                   chip->ibl.granularity) * chip->ibl.granularity;
1202                 if (chip->ibl.size > chip->ibl.max_size)
1203                         chip->ibl.size = chip->ibl.max_size;
1204         } else
1205                 chip->ibl.size = chip->ibl.min_size; /* set to the minimum */
1206         vx_set_ibl(chip, &chip->ibl);
1207 
1208         return 0;
1209 }
1210 
1211 
1212 /*
1213  * free callback for pcm
1214  */
1215 static void snd_vx_pcm_free(struct snd_pcm *pcm)
1216 {
1217         struct vx_core *chip = pcm->private_data;
1218         chip->pcm[pcm->device] = NULL;
1219         kfree(chip->playback_pipes);
1220         chip->playback_pipes = NULL;
1221         kfree(chip->capture_pipes);
1222         chip->capture_pipes = NULL;
1223 }
1224 
1225 /*
1226  * snd_vx_pcm_new - create and initialize a pcm
1227  */
1228 int snd_vx_pcm_new(struct vx_core *chip)
1229 {
1230         struct snd_pcm *pcm;
1231         unsigned int i;
1232         int err;
1233 
1234         if ((err = vx_init_audio_io(chip)) < 0)
1235                 return err;
1236 
1237         for (i = 0; i < chip->hw->num_codecs; i++) {
1238                 unsigned int outs, ins;
1239                 outs = chip->audio_outs > i * 2 ? 1 : 0;
1240                 ins = chip->audio_ins > i * 2 ? 1 : 0;
1241                 if (! outs && ! ins)
1242                         break;
1243                 err = snd_pcm_new(chip->card, "VX PCM", i,
1244                                   outs, ins, &pcm);
1245                 if (err < 0)
1246                         return err;
1247                 if (outs)
1248                         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &vx_pcm_playback_ops);
1249                 if (ins)
1250                         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &vx_pcm_capture_ops);
1251 
1252                 pcm->private_data = chip;
1253                 pcm->private_free = snd_vx_pcm_free;
1254                 pcm->info_flags = 0;
1255                 pcm->nonatomic = true;
1256                 strcpy(pcm->name, chip->card->shortname);
1257                 chip->pcm[i] = pcm;
1258         }
1259 
1260         return 0;
1261 }
1262 

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