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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 <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 | |
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); |
455 |
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