/sound/sh/sh_dac_audio.c
C | 454 lines | 324 code | 90 blank | 40 comment | 24 complexity | d2f4d88668fcb14409e997665f1974cf MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
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
39MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
40MODULE_DESCRIPTION("SuperH DAC audio driver");
41MODULE_LICENSE("GPL");
42MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
43
44/* Module Parameters */
45static int index = SNDRV_DEFAULT_IDX1;
46static char *id = SNDRV_DEFAULT_STR1;
47module_param(index, int, 0444);
48MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
49module_param(id, charp, 0444);
50MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
51
52/* main struct */
53struct 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
68static 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
74static void dac_audio_stop_timer(struct snd_sh_dac *chip)
75{
76 hrtimer_cancel(&chip->hrtimer);
77}
78
79static 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
87static 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
95static 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
113static 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
130static 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
142static 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
149static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
150{
151 return snd_pcm_lib_free_pages(substream);
152}
153
154static 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
165static 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
186static 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
212static 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
239static
240snd_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 */
249static 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
263static 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 */
289static 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 */
298static 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
307static 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
314static 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 */
348static 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 */
394static 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
427probe_error:
428 snd_card_free(card);
429 return err;
430}
431
432/*
433 * "driver" definition
434 */
435static 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
443static int __init sh_dac_init(void)
444{
445 return platform_driver_register(&driver);
446}
447
448static void __exit sh_dac_exit(void)
449{
450 platform_driver_unregister(&driver);
451}
452
453module_init(sh_dac_init);
454module_exit(sh_dac_exit);