Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[linux-2.6.git] / 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 <sound/core.h>
31 #include <sound/initval.h>
32 #include <sound/pcm.h>
33 #include <sound/sh_dac_audio.h>
34 #include <asm/clock.h>
35 #include <asm/hd64461.h>
36 #include <mach/hp6xx.h>
37 #include <cpu/dac.h>
38
39 MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
40 MODULE_DESCRIPTION("SuperH DAC audio driver");
41 MODULE_LICENSE("GPL");
42 MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
43
44 /* Module Parameters */
45 static int index = SNDRV_DEFAULT_IDX1;
46 static char *id = SNDRV_DEFAULT_STR1;
47 module_param(index, int, 0444);
48 MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
49 module_param(id, charp, 0444);
50 MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
51
52 /* main struct */
53 struct snd_sh_dac {
54         struct snd_card *card;
55         struct snd_pcm_substream *substream;
56         struct hrtimer hrtimer;
57         ktime_t wakeups_per_second;
58
59         int rate;
60         int empty;
61         char *data_buffer, *buffer_begin, *buffer_end;
62         int processed; /* bytes proccesed, to compare with period_size */
63         int buffer_size;
64         struct dac_audio_pdata *pdata;
65 };
66
67
68 static void dac_audio_start_timer(struct snd_sh_dac *chip)
69 {
70         hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
71                       HRTIMER_MODE_REL);
72 }
73
74 static void dac_audio_stop_timer(struct snd_sh_dac *chip)
75 {
76         hrtimer_cancel(&chip->hrtimer);
77 }
78
79 static void dac_audio_reset(struct snd_sh_dac *chip)
80 {
81         dac_audio_stop_timer(chip);
82         chip->buffer_begin = chip->buffer_end = chip->data_buffer;
83         chip->processed = 0;
84         chip->empty = 1;
85 }
86
87 static void dac_audio_set_rate(struct snd_sh_dac *chip)
88 {
89         chip->wakeups_per_second = ktime_set(0, 1000000000 / chip->rate);
90 }
91
92
93 /* PCM INTERFACE */
94
95 static struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
96         .info                   = (SNDRV_PCM_INFO_MMAP |
97                                         SNDRV_PCM_INFO_MMAP_VALID |
98                                         SNDRV_PCM_INFO_INTERLEAVED |
99                                         SNDRV_PCM_INFO_HALF_DUPLEX),
100         .formats                = SNDRV_PCM_FMTBIT_U8,
101         .rates                  = SNDRV_PCM_RATE_8000,
102         .rate_min               = 8000,
103         .rate_max               = 8000,
104         .channels_min           = 1,
105         .channels_max           = 1,
106         .buffer_bytes_max       = (48*1024),
107         .period_bytes_min       = 1,
108         .period_bytes_max       = (48*1024),
109         .periods_min            = 1,
110         .periods_max            = 1024,
111 };
112
113 static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
114 {
115         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
116         struct snd_pcm_runtime *runtime = substream->runtime;
117
118         runtime->hw = snd_sh_dac_pcm_hw;
119
120         chip->substream = substream;
121         chip->buffer_begin = chip->buffer_end = chip->data_buffer;
122         chip->processed = 0;
123         chip->empty = 1;
124
125         chip->pdata->start(chip->pdata);
126
127         return 0;
128 }
129
130 static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
131 {
132         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
133
134         chip->substream = NULL;
135
136         dac_audio_stop_timer(chip);
137         chip->pdata->stop(chip->pdata);
138
139         return 0;
140 }
141
142 static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream,
143                                 struct snd_pcm_hw_params *hw_params)
144 {
145         return snd_pcm_lib_malloc_pages(substream,
146                         params_buffer_bytes(hw_params));
147 }
148
149 static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
150 {
151         return snd_pcm_lib_free_pages(substream);
152 }
153
154 static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
155 {
156         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
157         struct snd_pcm_runtime *runtime = chip->substream->runtime;
158
159         chip->buffer_size = runtime->buffer_size;
160         memset(chip->data_buffer, 0, chip->pdata->buffer_size);
161
162         return 0;
163 }
164
165 static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
166 {
167         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
168
169         switch (cmd) {
170         case SNDRV_PCM_TRIGGER_START:
171                 dac_audio_start_timer(chip);
172                 break;
173         case SNDRV_PCM_TRIGGER_STOP:
174                 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
175                 chip->processed = 0;
176                 chip->empty = 1;
177                 dac_audio_stop_timer(chip);
178                 break;
179         default:
180                  return -EINVAL;
181         }
182
183         return 0;
184 }
185
186 static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, int channel,
187         snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count)
188 {
189         /* channel is not used (interleaved data) */
190         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
191         struct snd_pcm_runtime *runtime = substream->runtime;
192         ssize_t b_count = frames_to_bytes(runtime , count);
193         ssize_t b_pos = frames_to_bytes(runtime , pos);
194
195         if (count < 0)
196                 return -EINVAL;
197
198         if (!count)
199                 return 0;
200
201         memcpy_toio(chip->data_buffer + b_pos, src, b_count);
202         chip->buffer_end = chip->data_buffer + b_pos + b_count;
203
204         if (chip->empty) {
205                 chip->empty = 0;
206                 dac_audio_start_timer(chip);
207         }
208
209         return 0;
210 }
211
212 static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
213                                   int channel, snd_pcm_uframes_t pos,
214                                   snd_pcm_uframes_t count)
215 {
216         /* channel is not used (interleaved data) */
217         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
218         struct snd_pcm_runtime *runtime = substream->runtime;
219         ssize_t b_count = frames_to_bytes(runtime , count);
220         ssize_t b_pos = frames_to_bytes(runtime , pos);
221
222         if (count < 0)
223                 return -EINVAL;
224
225         if (!count)
226                 return 0;
227
228         memset_io(chip->data_buffer + b_pos, 0, b_count);
229         chip->buffer_end = chip->data_buffer + b_pos + b_count;
230
231         if (chip->empty) {
232                 chip->empty = 0;
233                 dac_audio_start_timer(chip);
234         }
235
236         return 0;
237 }
238
239 static
240 snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
241 {
242         struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
243         int pointer = chip->buffer_begin - chip->data_buffer;
244
245         return pointer;
246 }
247
248 /* pcm ops */
249 static struct snd_pcm_ops snd_sh_dac_pcm_ops = {
250         .open           = snd_sh_dac_pcm_open,
251         .close          = snd_sh_dac_pcm_close,
252         .ioctl          = snd_pcm_lib_ioctl,
253         .hw_params      = snd_sh_dac_pcm_hw_params,
254         .hw_free        = snd_sh_dac_pcm_hw_free,
255         .prepare        = snd_sh_dac_pcm_prepare,
256         .trigger        = snd_sh_dac_pcm_trigger,
257         .pointer        = snd_sh_dac_pcm_pointer,
258         .copy           = snd_sh_dac_pcm_copy,
259         .silence        = snd_sh_dac_pcm_silence,
260         .mmap           = snd_pcm_lib_mmap_iomem,
261 };
262
263 static int __devinit snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
264 {
265         int err;
266         struct snd_pcm *pcm;
267
268         /* device should be always 0 for us */
269         err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
270         if (err < 0)
271                 return err;
272
273         pcm->private_data = chip;
274         strcpy(pcm->name, "SH_DAC PCM");
275         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
276
277         /* buffer size=48K */
278         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
279                                           snd_dma_continuous_data(GFP_KERNEL),
280                                                         48 * 1024,
281                                                         48 * 1024);
282
283         return 0;
284 }
285 /* END OF PCM INTERFACE */
286
287
288 /* driver .remove  --  destructor */
289 static int snd_sh_dac_remove(struct platform_device *devptr)
290 {
291         snd_card_free(platform_get_drvdata(devptr));
292         platform_set_drvdata(devptr, NULL);
293
294         return 0;
295 }
296
297 /* free -- it has been defined by create */
298 static int snd_sh_dac_free(struct snd_sh_dac *chip)
299 {
300         /* release the data */
301         kfree(chip->data_buffer);
302         kfree(chip);
303
304         return 0;
305 }
306
307 static int snd_sh_dac_dev_free(struct snd_device *device)
308 {
309         struct snd_sh_dac *chip = device->device_data;
310
311         return snd_sh_dac_free(chip);
312 }
313
314 static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
315 {
316         struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
317                                                hrtimer);
318         struct snd_pcm_runtime *runtime = chip->substream->runtime;
319         ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
320
321         if (!chip->empty) {
322                 sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
323                 chip->buffer_begin++;
324
325                 chip->processed++;
326                 if (chip->processed >= b_ps) {
327                         chip->processed -= b_ps;
328                         snd_pcm_period_elapsed(chip->substream);
329                 }
330
331                 if (chip->buffer_begin == (chip->data_buffer +
332                                            chip->buffer_size - 1))
333                         chip->buffer_begin = chip->data_buffer;
334
335                 if (chip->buffer_begin == chip->buffer_end)
336                         chip->empty = 1;
337
338         }
339
340         if (!chip->empty)
341                 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
342                               HRTIMER_MODE_REL);
343
344         return HRTIMER_NORESTART;
345 }
346
347 /* create  --  chip-specific constructor for the cards components */
348 static int __devinit snd_sh_dac_create(struct snd_card *card,
349                                        struct platform_device *devptr,
350                                        struct snd_sh_dac **rchip)
351 {
352         struct snd_sh_dac *chip;
353         int err;
354
355         static struct snd_device_ops ops = {
356                    .dev_free = snd_sh_dac_dev_free,
357         };
358
359         *rchip = NULL;
360
361         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
362         if (chip == NULL)
363                 return -ENOMEM;
364
365         chip->card = card;
366
367         hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
368         chip->hrtimer.function = sh_dac_audio_timer;
369
370         dac_audio_reset(chip);
371         chip->rate = 8000;
372         dac_audio_set_rate(chip);
373
374         chip->pdata = devptr->dev.platform_data;
375
376         chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
377         if (chip->data_buffer == NULL) {
378                 kfree(chip);
379                 return -ENOMEM;
380         }
381
382         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
383         if (err < 0) {
384                 snd_sh_dac_free(chip);
385                 return err;
386         }
387
388         *rchip = chip;
389
390         return 0;
391 }
392
393 /* driver .probe  --  constructor */
394 static int __devinit snd_sh_dac_probe(struct platform_device *devptr)
395 {
396         struct snd_sh_dac *chip;
397         struct snd_card *card;
398         int err;
399
400         err = snd_card_create(index, id, THIS_MODULE, 0, &card);
401         if (err < 0) {
402                         snd_printk(KERN_ERR "cannot allocate the card\n");
403                         return err;
404         }
405
406         err = snd_sh_dac_create(card, devptr, &chip);
407         if (err < 0)
408                 goto probe_error;
409
410         err = snd_sh_dac_pcm(chip, 0);
411         if (err < 0)
412                 goto probe_error;
413
414         strcpy(card->driver, "snd_sh_dac");
415         strcpy(card->shortname, "SuperH DAC audio driver");
416         printk(KERN_INFO "%s %s", card->longname, card->shortname);
417
418         err = snd_card_register(card);
419         if (err < 0)
420                 goto probe_error;
421
422         snd_printk("ALSA driver for SuperH DAC audio");
423
424         platform_set_drvdata(devptr, card);
425         return 0;
426
427 probe_error:
428         snd_card_free(card);
429         return err;
430 }
431
432 /*
433  * "driver" definition
434  */
435 static struct platform_driver driver = {
436         .probe  = snd_sh_dac_probe,
437         .remove = snd_sh_dac_remove,
438         .driver = {
439                 .name = "dac_audio",
440         },
441 };
442
443 static int __init sh_dac_init(void)
444 {
445         return platform_driver_register(&driver);
446 }
447
448 static void __exit sh_dac_exit(void)
449 {
450         platform_driver_unregister(&driver);
451 }
452
453 module_init(sh_dac_init);
454 module_exit(sh_dac_exit);