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-rw-r--r--sound/sh/sh_dac_audio.c453
1 files changed, 453 insertions, 0 deletions
diff --git a/sound/sh/sh_dac_audio.c b/sound/sh/sh_dac_audio.c
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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 <sound/core.h>
30#include <sound/initval.h>
31#include <sound/pcm.h>
32#include <sound/sh_dac_audio.h>
33#include <asm/clock.h>
34#include <asm/hd64461.h>
35#include <mach/hp6xx.h>
36#include <cpu/dac.h>
37
38MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
39MODULE_DESCRIPTION("SuperH DAC audio driver");
40MODULE_LICENSE("GPL");
41MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
42
43/* Module Parameters */
44static int index = SNDRV_DEFAULT_IDX1;
45static char *id = SNDRV_DEFAULT_STR1;
46module_param(index, int, 0444);
47MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
48module_param(id, charp, 0444);
49MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
50
51/* main struct */
52struct snd_sh_dac {
53 struct snd_card *card;
54 struct snd_pcm_substream *substream;
55 struct hrtimer hrtimer;
56 ktime_t wakeups_per_second;
57
58 int rate;
59 int empty;
60 char *data_buffer, *buffer_begin, *buffer_end;
61 int processed; /* bytes proccesed, to compare with period_size */
62 int buffer_size;
63 struct dac_audio_pdata *pdata;
64};
65
66
67static void dac_audio_start_timer(struct snd_sh_dac *chip)
68{
69 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
70 HRTIMER_MODE_REL);
71}
72
73static void dac_audio_stop_timer(struct snd_sh_dac *chip)
74{
75 hrtimer_cancel(&chip->hrtimer);
76}
77
78static void dac_audio_reset(struct snd_sh_dac *chip)
79{
80 dac_audio_stop_timer(chip);
81 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
82 chip->processed = 0;
83 chip->empty = 1;
84}
85
86static void dac_audio_set_rate(struct snd_sh_dac *chip)
87{
88 chip->wakeups_per_second = ktime_set(0, 1000000000 / chip->rate);
89}
90
91
92/* PCM INTERFACE */
93
94static struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
95 .info = (SNDRV_PCM_INFO_MMAP |
96 SNDRV_PCM_INFO_MMAP_VALID |
97 SNDRV_PCM_INFO_INTERLEAVED |
98 SNDRV_PCM_INFO_HALF_DUPLEX),
99 .formats = SNDRV_PCM_FMTBIT_U8,
100 .rates = SNDRV_PCM_RATE_8000,
101 .rate_min = 8000,
102 .rate_max = 8000,
103 .channels_min = 1,
104 .channels_max = 1,
105 .buffer_bytes_max = (48*1024),
106 .period_bytes_min = 1,
107 .period_bytes_max = (48*1024),
108 .periods_min = 1,
109 .periods_max = 1024,
110};
111
112static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
113{
114 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
115 struct snd_pcm_runtime *runtime = substream->runtime;
116
117 runtime->hw = snd_sh_dac_pcm_hw;
118
119 chip->substream = substream;
120 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
121 chip->processed = 0;
122 chip->empty = 1;
123
124 chip->pdata->start(chip->pdata);
125
126 return 0;
127}
128
129static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
130{
131 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
132
133 chip->substream = NULL;
134
135 dac_audio_stop_timer(chip);
136 chip->pdata->stop(chip->pdata);
137
138 return 0;
139}
140
141static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream,
142 struct snd_pcm_hw_params *hw_params)
143{
144 return snd_pcm_lib_malloc_pages(substream,
145 params_buffer_bytes(hw_params));
146}
147
148static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
149{
150 return snd_pcm_lib_free_pages(substream);
151}
152
153static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
154{
155 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
156 struct snd_pcm_runtime *runtime = chip->substream->runtime;
157
158 chip->buffer_size = runtime->buffer_size;
159 memset(chip->data_buffer, 0, chip->pdata->buffer_size);
160
161 return 0;
162}
163
164static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
165{
166 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
167
168 switch (cmd) {
169 case SNDRV_PCM_TRIGGER_START:
170 dac_audio_start_timer(chip);
171 break;
172 case SNDRV_PCM_TRIGGER_STOP:
173 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
174 chip->processed = 0;
175 chip->empty = 1;
176 dac_audio_stop_timer(chip);
177 break;
178 default:
179 return -EINVAL;
180 }
181
182 return 0;
183}
184
185static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, int channel,
186 snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count)
187{
188 /* channel is not used (interleaved data) */
189 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
190 struct snd_pcm_runtime *runtime = substream->runtime;
191 ssize_t b_count = frames_to_bytes(runtime , count);
192 ssize_t b_pos = frames_to_bytes(runtime , pos);
193
194 if (count < 0)
195 return -EINVAL;
196
197 if (!count)
198 return 0;
199
200 memcpy_toio(chip->data_buffer + b_pos, src, b_count);
201 chip->buffer_end = chip->data_buffer + b_pos + b_count;
202
203 if (chip->empty) {
204 chip->empty = 0;
205 dac_audio_start_timer(chip);
206 }
207
208 return 0;
209}
210
211static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
212 int channel, snd_pcm_uframes_t pos,
213 snd_pcm_uframes_t count)
214{
215 /* channel is not used (interleaved data) */
216 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
217 struct snd_pcm_runtime *runtime = substream->runtime;
218 ssize_t b_count = frames_to_bytes(runtime , count);
219 ssize_t b_pos = frames_to_bytes(runtime , pos);
220
221 if (count < 0)
222 return -EINVAL;
223
224 if (!count)
225 return 0;
226
227 memset_io(chip->data_buffer + b_pos, 0, b_count);
228 chip->buffer_end = chip->data_buffer + b_pos + b_count;
229
230 if (chip->empty) {
231 chip->empty = 0;
232 dac_audio_start_timer(chip);
233 }
234
235 return 0;
236}
237
238static
239snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
240{
241 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
242 int pointer = chip->buffer_begin - chip->data_buffer;
243
244 return pointer;
245}
246
247/* pcm ops */
248static struct snd_pcm_ops snd_sh_dac_pcm_ops = {
249 .open = snd_sh_dac_pcm_open,
250 .close = snd_sh_dac_pcm_close,
251 .ioctl = snd_pcm_lib_ioctl,
252 .hw_params = snd_sh_dac_pcm_hw_params,
253 .hw_free = snd_sh_dac_pcm_hw_free,
254 .prepare = snd_sh_dac_pcm_prepare,
255 .trigger = snd_sh_dac_pcm_trigger,
256 .pointer = snd_sh_dac_pcm_pointer,
257 .copy = snd_sh_dac_pcm_copy,
258 .silence = snd_sh_dac_pcm_silence,
259 .mmap = snd_pcm_lib_mmap_iomem,
260};
261
262static int __devinit snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
263{
264 int err;
265 struct snd_pcm *pcm;
266
267 /* device should be always 0 for us */
268 err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
269 if (err < 0)
270 return err;
271
272 pcm->private_data = chip;
273 strcpy(pcm->name, "SH_DAC PCM");
274 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
275
276 /* buffer size=48K */
277 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
278 snd_dma_continuous_data(GFP_KERNEL),
279 48 * 1024,
280 48 * 1024);
281
282 return 0;
283}
284/* END OF PCM INTERFACE */
285
286
287/* driver .remove -- destructor */
288static int snd_sh_dac_remove(struct platform_device *devptr)
289{
290 snd_card_free(platform_get_drvdata(devptr));
291 platform_set_drvdata(devptr, NULL);
292
293 return 0;
294}
295
296/* free -- it has been defined by create */
297static 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
306static 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
313static 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 */
347static int __devinit 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 */
393static int __devinit 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_create(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
426probe_error:
427 snd_card_free(card);
428 return err;
429}
430
431/*
432 * "driver" definition
433 */
434static struct platform_driver driver = {
435 .probe = snd_sh_dac_probe,
436 .remove = snd_sh_dac_remove,
437 .driver = {
438 .name = "dac_audio",
439 },
440};
441
442static int __init sh_dac_init(void)
443{
444 return platform_driver_register(&driver);
445}
446
447static void __exit sh_dac_exit(void)
448{
449 platform_driver_unregister(&driver);
450}
451
452module_init(sh_dac_init);
453module_exit(sh_dac_exit);