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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> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
da155d5b | 30 | #include <linux/module.h> |
9dcaa7b2 RIZ |
31 | #include <sound/core.h> |
32 | #include <sound/initval.h> | |
33 | #include <sound/pcm.h> | |
34 | #include <sound/sh_dac_audio.h> | |
35 | #include <asm/clock.h> | |
36 | #include <asm/hd64461.h> | |
37 | #include <mach/hp6xx.h> | |
38 | #include <cpu/dac.h> | |
39 | ||
40 | MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>"); | |
41 | MODULE_DESCRIPTION("SuperH DAC audio driver"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}"); | |
44 | ||
45 | /* Module Parameters */ | |
46 | static int index = SNDRV_DEFAULT_IDX1; | |
47 | static char *id = SNDRV_DEFAULT_STR1; | |
48 | module_param(index, int, 0444); | |
49 | MODULE_PARM_DESC(index, "Index value for SuperH DAC audio."); | |
50 | module_param(id, charp, 0444); | |
51 | MODULE_PARM_DESC(id, "ID string for SuperH DAC audio."); | |
52 | ||
53 | /* main struct */ | |
54 | struct snd_sh_dac { | |
55 | struct snd_card *card; | |
56 | struct snd_pcm_substream *substream; | |
57 | struct hrtimer hrtimer; | |
58 | ktime_t wakeups_per_second; | |
59 | ||
60 | int rate; | |
61 | int empty; | |
62 | char *data_buffer, *buffer_begin, *buffer_end; | |
63 | int processed; /* bytes proccesed, to compare with period_size */ | |
64 | int buffer_size; | |
65 | struct dac_audio_pdata *pdata; | |
66 | }; | |
67 | ||
68 | ||
69 | static void dac_audio_start_timer(struct snd_sh_dac *chip) | |
70 | { | |
71 | hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, | |
72 | HRTIMER_MODE_REL); | |
73 | } | |
74 | ||
75 | static void dac_audio_stop_timer(struct snd_sh_dac *chip) | |
76 | { | |
77 | hrtimer_cancel(&chip->hrtimer); | |
78 | } | |
79 | ||
80 | static void dac_audio_reset(struct snd_sh_dac *chip) | |
81 | { | |
82 | dac_audio_stop_timer(chip); | |
83 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; | |
84 | chip->processed = 0; | |
85 | chip->empty = 1; | |
86 | } | |
87 | ||
88 | static void dac_audio_set_rate(struct snd_sh_dac *chip) | |
89 | { | |
8b0e1953 | 90 | chip->wakeups_per_second = 1000000000 / chip->rate; |
9dcaa7b2 RIZ |
91 | } |
92 | ||
93 | ||
94 | /* PCM INTERFACE */ | |
95 | ||
96 | static struct snd_pcm_hardware snd_sh_dac_pcm_hw = { | |
97 | .info = (SNDRV_PCM_INFO_MMAP | | |
98 | SNDRV_PCM_INFO_MMAP_VALID | | |
99 | SNDRV_PCM_INFO_INTERLEAVED | | |
100 | SNDRV_PCM_INFO_HALF_DUPLEX), | |
101 | .formats = SNDRV_PCM_FMTBIT_U8, | |
102 | .rates = SNDRV_PCM_RATE_8000, | |
103 | .rate_min = 8000, | |
104 | .rate_max = 8000, | |
105 | .channels_min = 1, | |
106 | .channels_max = 1, | |
107 | .buffer_bytes_max = (48*1024), | |
108 | .period_bytes_min = 1, | |
109 | .period_bytes_max = (48*1024), | |
110 | .periods_min = 1, | |
111 | .periods_max = 1024, | |
112 | }; | |
113 | ||
114 | static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream) | |
115 | { | |
116 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
117 | struct snd_pcm_runtime *runtime = substream->runtime; | |
118 | ||
119 | runtime->hw = snd_sh_dac_pcm_hw; | |
120 | ||
121 | chip->substream = substream; | |
122 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; | |
123 | chip->processed = 0; | |
124 | chip->empty = 1; | |
125 | ||
126 | chip->pdata->start(chip->pdata); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream) | |
132 | { | |
133 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
134 | ||
135 | chip->substream = NULL; | |
136 | ||
137 | dac_audio_stop_timer(chip); | |
138 | chip->pdata->stop(chip->pdata); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream, | |
144 | struct snd_pcm_hw_params *hw_params) | |
145 | { | |
146 | return snd_pcm_lib_malloc_pages(substream, | |
147 | params_buffer_bytes(hw_params)); | |
148 | } | |
149 | ||
150 | static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream) | |
151 | { | |
152 | return snd_pcm_lib_free_pages(substream); | |
153 | } | |
154 | ||
155 | static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream) | |
156 | { | |
157 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
158 | struct snd_pcm_runtime *runtime = chip->substream->runtime; | |
159 | ||
160 | chip->buffer_size = runtime->buffer_size; | |
161 | memset(chip->data_buffer, 0, chip->pdata->buffer_size); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
167 | { | |
168 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
169 | ||
170 | switch (cmd) { | |
171 | case SNDRV_PCM_TRIGGER_START: | |
172 | dac_audio_start_timer(chip); | |
173 | break; | |
174 | case SNDRV_PCM_TRIGGER_STOP: | |
175 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; | |
176 | chip->processed = 0; | |
177 | chip->empty = 1; | |
178 | dac_audio_stop_timer(chip); | |
179 | break; | |
180 | default: | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
1cc2f8ba TI |
187 | static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, |
188 | int channel, unsigned long pos, | |
189 | void __user *src, unsigned long count) | |
9dcaa7b2 RIZ |
190 | { |
191 | /* channel is not used (interleaved data) */ | |
192 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
193 | struct snd_pcm_runtime *runtime = substream->runtime; | |
9dcaa7b2 | 194 | |
1cc2f8ba TI |
195 | if (copy_from_user_toio(chip->data_buffer + pos, src, count)) |
196 | return -EFAULT; | |
197 | chip->buffer_end = chip->data_buffer + pos + count; | |
9dcaa7b2 | 198 | |
1cc2f8ba TI |
199 | if (chip->empty) { |
200 | chip->empty = 0; | |
201 | dac_audio_start_timer(chip); | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
9dcaa7b2 | 206 | |
1cc2f8ba TI |
207 | static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream, |
208 | int channel, unsigned long pos, | |
209 | void *src, unsigned long count) | |
210 | { | |
211 | /* channel is not used (interleaved data) */ | |
212 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
213 | struct snd_pcm_runtime *runtime = substream->runtime; | |
214 | ||
215 | memcpy_toio(chip->data_buffer + pos, src, count); | |
216 | chip->buffer_end = chip->data_buffer + pos + count; | |
9dcaa7b2 RIZ |
217 | |
218 | if (chip->empty) { | |
219 | chip->empty = 0; | |
220 | dac_audio_start_timer(chip); | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream, | |
1cc2f8ba TI |
227 | int channel, unsigned long pos, |
228 | unsigned long count) | |
9dcaa7b2 RIZ |
229 | { |
230 | /* channel is not used (interleaved data) */ | |
231 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
232 | struct snd_pcm_runtime *runtime = substream->runtime; | |
9dcaa7b2 | 233 | |
1cc2f8ba TI |
234 | memset_io(chip->data_buffer + pos, 0, count); |
235 | chip->buffer_end = chip->data_buffer + pos + count; | |
9dcaa7b2 RIZ |
236 | |
237 | if (chip->empty) { | |
238 | chip->empty = 0; | |
239 | dac_audio_start_timer(chip); | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static | |
246 | snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream) | |
247 | { | |
248 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
249 | int pointer = chip->buffer_begin - chip->data_buffer; | |
250 | ||
251 | return pointer; | |
252 | } | |
253 | ||
254 | /* pcm ops */ | |
255 | static struct snd_pcm_ops snd_sh_dac_pcm_ops = { | |
256 | .open = snd_sh_dac_pcm_open, | |
257 | .close = snd_sh_dac_pcm_close, | |
258 | .ioctl = snd_pcm_lib_ioctl, | |
259 | .hw_params = snd_sh_dac_pcm_hw_params, | |
260 | .hw_free = snd_sh_dac_pcm_hw_free, | |
261 | .prepare = snd_sh_dac_pcm_prepare, | |
262 | .trigger = snd_sh_dac_pcm_trigger, | |
263 | .pointer = snd_sh_dac_pcm_pointer, | |
1cc2f8ba TI |
264 | .copy_user = snd_sh_dac_pcm_copy, |
265 | .copy_kernel = snd_sh_dac_pcm_copy_kernel, | |
266 | .fill_silence = snd_sh_dac_pcm_silence, | |
9dcaa7b2 RIZ |
267 | .mmap = snd_pcm_lib_mmap_iomem, |
268 | }; | |
269 | ||
e74033a8 | 270 | static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device) |
9dcaa7b2 RIZ |
271 | { |
272 | int err; | |
273 | struct snd_pcm *pcm; | |
274 | ||
275 | /* device should be always 0 for us */ | |
276 | err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm); | |
277 | if (err < 0) | |
278 | return err; | |
279 | ||
280 | pcm->private_data = chip; | |
281 | strcpy(pcm->name, "SH_DAC PCM"); | |
282 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops); | |
283 | ||
284 | /* buffer size=48K */ | |
285 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, | |
286 | snd_dma_continuous_data(GFP_KERNEL), | |
287 | 48 * 1024, | |
288 | 48 * 1024); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | /* END OF PCM INTERFACE */ | |
293 | ||
294 | ||
295 | /* driver .remove -- destructor */ | |
296 | static int snd_sh_dac_remove(struct platform_device *devptr) | |
297 | { | |
298 | snd_card_free(platform_get_drvdata(devptr)); | |
9dcaa7b2 RIZ |
299 | return 0; |
300 | } | |
301 | ||
302 | /* free -- it has been defined by create */ | |
303 | static int snd_sh_dac_free(struct snd_sh_dac *chip) | |
304 | { | |
305 | /* release the data */ | |
306 | kfree(chip->data_buffer); | |
307 | kfree(chip); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static int snd_sh_dac_dev_free(struct snd_device *device) | |
313 | { | |
314 | struct snd_sh_dac *chip = device->device_data; | |
315 | ||
316 | return snd_sh_dac_free(chip); | |
317 | } | |
318 | ||
319 | static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle) | |
320 | { | |
321 | struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac, | |
322 | hrtimer); | |
323 | struct snd_pcm_runtime *runtime = chip->substream->runtime; | |
324 | ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size); | |
325 | ||
326 | if (!chip->empty) { | |
327 | sh_dac_output(*chip->buffer_begin, chip->pdata->channel); | |
328 | chip->buffer_begin++; | |
329 | ||
330 | chip->processed++; | |
331 | if (chip->processed >= b_ps) { | |
332 | chip->processed -= b_ps; | |
333 | snd_pcm_period_elapsed(chip->substream); | |
334 | } | |
335 | ||
336 | if (chip->buffer_begin == (chip->data_buffer + | |
337 | chip->buffer_size - 1)) | |
338 | chip->buffer_begin = chip->data_buffer; | |
339 | ||
340 | if (chip->buffer_begin == chip->buffer_end) | |
341 | chip->empty = 1; | |
342 | ||
343 | } | |
344 | ||
345 | if (!chip->empty) | |
346 | hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, | |
347 | HRTIMER_MODE_REL); | |
348 | ||
349 | return HRTIMER_NORESTART; | |
350 | } | |
351 | ||
352 | /* create -- chip-specific constructor for the cards components */ | |
e74033a8 BP |
353 | static int snd_sh_dac_create(struct snd_card *card, |
354 | struct platform_device *devptr, | |
355 | struct snd_sh_dac **rchip) | |
9dcaa7b2 RIZ |
356 | { |
357 | struct snd_sh_dac *chip; | |
358 | int err; | |
359 | ||
360 | static struct snd_device_ops ops = { | |
361 | .dev_free = snd_sh_dac_dev_free, | |
362 | }; | |
363 | ||
364 | *rchip = NULL; | |
365 | ||
366 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
367 | if (chip == NULL) | |
368 | return -ENOMEM; | |
369 | ||
370 | chip->card = card; | |
371 | ||
372 | hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
373 | chip->hrtimer.function = sh_dac_audio_timer; | |
374 | ||
375 | dac_audio_reset(chip); | |
376 | chip->rate = 8000; | |
377 | dac_audio_set_rate(chip); | |
378 | ||
379 | chip->pdata = devptr->dev.platform_data; | |
380 | ||
381 | chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL); | |
382 | if (chip->data_buffer == NULL) { | |
383 | kfree(chip); | |
384 | return -ENOMEM; | |
385 | } | |
386 | ||
387 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); | |
388 | if (err < 0) { | |
389 | snd_sh_dac_free(chip); | |
390 | return err; | |
391 | } | |
392 | ||
393 | *rchip = chip; | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | /* driver .probe -- constructor */ | |
e74033a8 | 399 | static int snd_sh_dac_probe(struct platform_device *devptr) |
9dcaa7b2 RIZ |
400 | { |
401 | struct snd_sh_dac *chip; | |
402 | struct snd_card *card; | |
403 | int err; | |
404 | ||
e7182ac5 | 405 | err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card); |
9dcaa7b2 RIZ |
406 | if (err < 0) { |
407 | snd_printk(KERN_ERR "cannot allocate the card\n"); | |
408 | return err; | |
409 | } | |
410 | ||
411 | err = snd_sh_dac_create(card, devptr, &chip); | |
412 | if (err < 0) | |
413 | goto probe_error; | |
414 | ||
415 | err = snd_sh_dac_pcm(chip, 0); | |
416 | if (err < 0) | |
417 | goto probe_error; | |
418 | ||
419 | strcpy(card->driver, "snd_sh_dac"); | |
420 | strcpy(card->shortname, "SuperH DAC audio driver"); | |
421 | printk(KERN_INFO "%s %s", card->longname, card->shortname); | |
422 | ||
423 | err = snd_card_register(card); | |
424 | if (err < 0) | |
425 | goto probe_error; | |
426 | ||
427 | snd_printk("ALSA driver for SuperH DAC audio"); | |
428 | ||
429 | platform_set_drvdata(devptr, card); | |
430 | return 0; | |
431 | ||
432 | probe_error: | |
433 | snd_card_free(card); | |
434 | return err; | |
435 | } | |
436 | ||
437 | /* | |
438 | * "driver" definition | |
439 | */ | |
d4c69838 | 440 | static struct platform_driver sh_dac_driver = { |
9dcaa7b2 RIZ |
441 | .probe = snd_sh_dac_probe, |
442 | .remove = snd_sh_dac_remove, | |
443 | .driver = { | |
444 | .name = "dac_audio", | |
445 | }, | |
446 | }; | |
447 | ||
d4c69838 | 448 | module_platform_driver(sh_dac_driver); |