Commit | Line | Data |
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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> | |
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 | ||
38 | MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>"); | |
39 | MODULE_DESCRIPTION("SuperH DAC audio driver"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}"); | |
42 | ||
43 | /* Module Parameters */ | |
44 | static int index = SNDRV_DEFAULT_IDX1; | |
45 | static char *id = SNDRV_DEFAULT_STR1; | |
46 | module_param(index, int, 0444); | |
47 | MODULE_PARM_DESC(index, "Index value for SuperH DAC audio."); | |
48 | module_param(id, charp, 0444); | |
49 | MODULE_PARM_DESC(id, "ID string for SuperH DAC audio."); | |
50 | ||
51 | /* main struct */ | |
52 | struct 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 | ||
67 | static 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 | ||
73 | static void dac_audio_stop_timer(struct snd_sh_dac *chip) | |
74 | { | |
75 | hrtimer_cancel(&chip->hrtimer); | |
76 | } | |
77 | ||
78 | static 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 | ||
86 | static 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 | ||
94 | static 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 | ||
112 | static 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 | ||
129 | static 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 | ||
141 | static 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 | ||
148 | static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream) | |
149 | { | |
150 | return snd_pcm_lib_free_pages(substream); | |
151 | } | |
152 | ||
153 | static 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 | ||
164 | static 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 | ||
185 | static 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 | ||
211 | static 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 | ||
238 | static | |
239 | snd_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 */ | |
248 | static 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 | ||
262 | static 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 */ | |
288 | static 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 */ | |
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 __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 */ | |
393 | static 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 | ||
426 | probe_error: | |
427 | snd_card_free(card); | |
428 | return err; | |
429 | } | |
430 | ||
431 | /* | |
432 | * "driver" definition | |
433 | */ | |
434 | static 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 | ||
442 | static int __init sh_dac_init(void) | |
443 | { | |
444 | return platform_driver_register(&driver); | |
445 | } | |
446 | ||
447 | static void __exit sh_dac_exit(void) | |
448 | { | |
449 | platform_driver_unregister(&driver); | |
450 | } | |
451 | ||
452 | module_init(sh_dac_init); | |
453 | module_exit(sh_dac_exit); |