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Linux/sound/sh/sh_dac_audio.c

  1 /*
  2  * sh_dac_audio.c - SuperH DAC audio driver for ALSA
  3  *
  4  * Copyright (c) 2009 by Rafael Ignacio Zurita <rizurita@yahoo.com>
  5  *
  6  *
  7  * Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh)
  8  *
  9  *   This program is free software; you can redistribute it and/or modify
 10  *   it under the terms of the GNU General Public License as published by
 11  *   the Free Software Foundation; either version 2 of the License, or
 12  *   (at your option) any later version.
 13  *
 14  *   This program is distributed in the hope that it will be useful,
 15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  *   GNU General Public License for more details.
 18  *
 19  *   You should have received a copy of the GNU General Public License
 20  *   along with this program; if not, write to the Free Software
 21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 22  *
 23  */
 24 
 25 #include <linux/hrtimer.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/io.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/slab.h>
 30 #include <linux/module.h>
 31 #include <sound/core.h>
 32 #include <sound/initval.h>
 33 #include <sound/pcm.h>
 34 #include <sound/sh_dac_audio.h>
 35 #include <asm/clock.h>
 36 #include <asm/hd64461.h>
 37 #include <mach/hp6xx.h>
 38 #include <cpu/dac.h>
 39 
 40 MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
 41 MODULE_DESCRIPTION("SuperH DAC audio driver");
 42 MODULE_LICENSE("GPL");
 43 MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
 44 
 45 /* Module Parameters */
 46 static int index = SNDRV_DEFAULT_IDX1;
 47 static char *id = SNDRV_DEFAULT_STR1;
 48 module_param(index, int, 0444);
 49 MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
 50 module_param(id, charp, 0444);
 51 MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
 52 
 53 /* main struct */
 54 struct snd_sh_dac {
 55         struct snd_card *card;
 56         struct snd_pcm_substream *substream;
 57         struct hrtimer hrtimer;
 58         ktime_t wakeups_per_second;
 59 
 60         int rate;
 61         int empty;
 62         char *data_buffer, *buffer_begin, *buffer_end;
 63         int processed; /* bytes proccesed, to compare with period_size */
 64         int buffer_size;
 65         struct dac_audio_pdata *pdata;
 66 };
 67 
 68 
 69 static void dac_audio_start_timer(struct snd_sh_dac *chip)
 70 {
 71         hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
 72                       HRTIMER_MODE_REL);
 73 }
 74 
 75 static void dac_audio_stop_timer(struct snd_sh_dac *chip)
 76 {
 77         hrtimer_cancel(&chip->hrtimer);
 78 }
 79 
 80 static void dac_audio_reset(struct snd_sh_dac *chip)
 81 {
 82         dac_audio_stop_timer(chip);
 83         chip->buffer_begin = chip->buffer_end = chip->data_buffer;
 84         chip->processed = 0;
 85         chip->empty = 1;
 86 }
 87 
 88 static void dac_audio_set_rate(struct snd_sh_dac *chip)
 89 {
 90         chip->wakeups_per_second = ktime_set(0, 1000000000 / chip->rate);
 91 }
 92 
 93 
 94 /* PCM INTERFACE */
 95 
 96 static struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
 97         .info                   = (SNDRV_PCM_INFO_MMAP |
 98                                         SNDRV_PCM_INFO_MMAP_VALID |
 99                                         SNDRV_PCM_INFO_INTERLEAVED |
100                                         SNDRV_PCM_INFO_HALF_DUPLEX),
101         .formats                = SNDRV_PCM_FMTBIT_U8,
102         .rates                  = SNDRV_PCM_RATE_8000,
103         .rate_min               = 8000,
104         .rate_max               = 8000,
105         .channels_min           = 1,
106         .channels_max           = 1,
107         .buffer_bytes_max       = (48*1024),
108         .period_bytes_min       = 1,
109         .period_bytes_max       = (48*1024),
110         .periods_min            = 1,
111         .periods_max            = 1024,
112 };
113 
114 static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
115 {
116         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
117         struct snd_pcm_runtime *runtime = substream->runtime;
118 
119         runtime->hw = snd_sh_dac_pcm_hw;
120 
121         chip->substream = substream;
122         chip->buffer_begin = chip->buffer_end = chip->data_buffer;
123         chip->processed = 0;
124         chip->empty = 1;
125 
126         chip->pdata->start(chip->pdata);
127 
128         return 0;
129 }
130 
131 static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
132 {
133         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
134 
135         chip->substream = NULL;
136 
137         dac_audio_stop_timer(chip);
138         chip->pdata->stop(chip->pdata);
139 
140         return 0;
141 }
142 
143 static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream,
144                                 struct snd_pcm_hw_params *hw_params)
145 {
146         return snd_pcm_lib_malloc_pages(substream,
147                         params_buffer_bytes(hw_params));
148 }
149 
150 static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
151 {
152         return snd_pcm_lib_free_pages(substream);
153 }
154 
155 static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
156 {
157         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
158         struct snd_pcm_runtime *runtime = chip->substream->runtime;
159 
160         chip->buffer_size = runtime->buffer_size;
161         memset(chip->data_buffer, 0, chip->pdata->buffer_size);
162 
163         return 0;
164 }
165 
166 static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
167 {
168         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
169 
170         switch (cmd) {
171         case SNDRV_PCM_TRIGGER_START:
172                 dac_audio_start_timer(chip);
173                 break;
174         case SNDRV_PCM_TRIGGER_STOP:
175                 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
176                 chip->processed = 0;
177                 chip->empty = 1;
178                 dac_audio_stop_timer(chip);
179                 break;
180         default:
181                  return -EINVAL;
182         }
183 
184         return 0;
185 }
186 
187 static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, int channel,
188         snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count)
189 {
190         /* channel is not used (interleaved data) */
191         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
192         struct snd_pcm_runtime *runtime = substream->runtime;
193         ssize_t b_count = frames_to_bytes(runtime , count);
194         ssize_t b_pos = frames_to_bytes(runtime , pos);
195 
196         if (count < 0)
197                 return -EINVAL;
198 
199         if (!count)
200                 return 0;
201 
202         memcpy_toio(chip->data_buffer + b_pos, src, b_count);
203         chip->buffer_end = chip->data_buffer + b_pos + b_count;
204 
205         if (chip->empty) {
206                 chip->empty = 0;
207                 dac_audio_start_timer(chip);
208         }
209 
210         return 0;
211 }
212 
213 static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
214                                   int channel, snd_pcm_uframes_t pos,
215                                   snd_pcm_uframes_t count)
216 {
217         /* channel is not used (interleaved data) */
218         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
219         struct snd_pcm_runtime *runtime = substream->runtime;
220         ssize_t b_count = frames_to_bytes(runtime , count);
221         ssize_t b_pos = frames_to_bytes(runtime , pos);
222 
223         if (count < 0)
224                 return -EINVAL;
225 
226         if (!count)
227                 return 0;
228 
229         memset_io(chip->data_buffer + b_pos, 0, b_count);
230         chip->buffer_end = chip->data_buffer + b_pos + b_count;
231 
232         if (chip->empty) {
233                 chip->empty = 0;
234                 dac_audio_start_timer(chip);
235         }
236 
237         return 0;
238 }
239 
240 static
241 snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
242 {
243         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
244         int pointer = chip->buffer_begin - chip->data_buffer;
245 
246         return pointer;
247 }
248 
249 /* pcm ops */
250 static struct snd_pcm_ops snd_sh_dac_pcm_ops = {
251         .open           = snd_sh_dac_pcm_open,
252         .close          = snd_sh_dac_pcm_close,
253         .ioctl          = snd_pcm_lib_ioctl,
254         .hw_params      = snd_sh_dac_pcm_hw_params,
255         .hw_free        = snd_sh_dac_pcm_hw_free,
256         .prepare        = snd_sh_dac_pcm_prepare,
257         .trigger        = snd_sh_dac_pcm_trigger,
258         .pointer        = snd_sh_dac_pcm_pointer,
259         .copy           = snd_sh_dac_pcm_copy,
260         .silence        = snd_sh_dac_pcm_silence,
261         .mmap           = snd_pcm_lib_mmap_iomem,
262 };
263 
264 static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
265 {
266         int err;
267         struct snd_pcm *pcm;
268 
269         /* device should be always 0 for us */
270         err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
271         if (err < 0)
272                 return err;
273 
274         pcm->private_data = chip;
275         strcpy(pcm->name, "SH_DAC PCM");
276         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
277 
278         /* buffer size=48K */
279         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
280                                           snd_dma_continuous_data(GFP_KERNEL),
281                                                         48 * 1024,
282                                                         48 * 1024);
283 
284         return 0;
285 }
286 /* END OF PCM INTERFACE */
287 
288 
289 /* driver .remove  --  destructor */
290 static int snd_sh_dac_remove(struct platform_device *devptr)
291 {
292         snd_card_free(platform_get_drvdata(devptr));
293         return 0;
294 }
295 
296 /* free -- it has been defined by create */
297 static int snd_sh_dac_free(struct snd_sh_dac *chip)
298 {
299         /* release the data */
300         kfree(chip->data_buffer);
301         kfree(chip);
302 
303         return 0;
304 }
305 
306 static int snd_sh_dac_dev_free(struct snd_device *device)
307 {
308         struct snd_sh_dac *chip = device->device_data;
309 
310         return snd_sh_dac_free(chip);
311 }
312 
313 static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
314 {
315         struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
316                                                hrtimer);
317         struct snd_pcm_runtime *runtime = chip->substream->runtime;
318         ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
319 
320         if (!chip->empty) {
321                 sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
322                 chip->buffer_begin++;
323 
324                 chip->processed++;
325                 if (chip->processed >= b_ps) {
326                         chip->processed -= b_ps;
327                         snd_pcm_period_elapsed(chip->substream);
328                 }
329 
330                 if (chip->buffer_begin == (chip->data_buffer +
331                                            chip->buffer_size - 1))
332                         chip->buffer_begin = chip->data_buffer;
333 
334                 if (chip->buffer_begin == chip->buffer_end)
335                         chip->empty = 1;
336 
337         }
338 
339         if (!chip->empty)
340                 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
341                               HRTIMER_MODE_REL);
342 
343         return HRTIMER_NORESTART;
344 }
345 
346 /* create  --  chip-specific constructor for the cards components */
347 static int snd_sh_dac_create(struct snd_card *card,
348                              struct platform_device *devptr,
349                              struct snd_sh_dac **rchip)
350 {
351         struct snd_sh_dac *chip;
352         int err;
353 
354         static struct snd_device_ops ops = {
355                    .dev_free = snd_sh_dac_dev_free,
356         };
357 
358         *rchip = NULL;
359 
360         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
361         if (chip == NULL)
362                 return -ENOMEM;
363 
364         chip->card = card;
365 
366         hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
367         chip->hrtimer.function = sh_dac_audio_timer;
368 
369         dac_audio_reset(chip);
370         chip->rate = 8000;
371         dac_audio_set_rate(chip);
372 
373         chip->pdata = devptr->dev.platform_data;
374 
375         chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
376         if (chip->data_buffer == NULL) {
377                 kfree(chip);
378                 return -ENOMEM;
379         }
380 
381         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
382         if (err < 0) {
383                 snd_sh_dac_free(chip);
384                 return err;
385         }
386 
387         *rchip = chip;
388 
389         return 0;
390 }
391 
392 /* driver .probe  --  constructor */
393 static int snd_sh_dac_probe(struct platform_device *devptr)
394 {
395         struct snd_sh_dac *chip;
396         struct snd_card *card;
397         int err;
398 
399         err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
400         if (err < 0) {
401                         snd_printk(KERN_ERR "cannot allocate the card\n");
402                         return err;
403         }
404 
405         err = snd_sh_dac_create(card, devptr, &chip);
406         if (err < 0)
407                 goto probe_error;
408 
409         err = snd_sh_dac_pcm(chip, 0);
410         if (err < 0)
411                 goto probe_error;
412 
413         strcpy(card->driver, "snd_sh_dac");
414         strcpy(card->shortname, "SuperH DAC audio driver");
415         printk(KERN_INFO "%s %s", card->longname, card->shortname);
416 
417         err = snd_card_register(card);
418         if (err < 0)
419                 goto probe_error;
420 
421         snd_printk("ALSA driver for SuperH DAC audio");
422 
423         platform_set_drvdata(devptr, card);
424         return 0;
425 
426 probe_error:
427         snd_card_free(card);
428         return err;
429 }
430 
431 /*
432  * "driver" definition
433  */
434 static struct platform_driver sh_dac_driver = {
435         .probe  = snd_sh_dac_probe,
436         .remove = snd_sh_dac_remove,
437         .driver = {
438                 .name = "dac_audio",
439                 .owner  = THIS_MODULE,
440         },
441 };
442 
443 module_platform_driver(sh_dac_driver);
444 

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