Commit | Line | Data |
---|---|---|
9dcaa7b2 RIZ |
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> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
9dcaa7b2 RIZ |
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); |