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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 <linux/module.h> |
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 | { |
90 | chip->wakeups_per_second = ktime_set(0, 1000000000 / chip->rate); |
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 | |
187 | static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, int channel, |
188 | snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count) |
189 | { |
190 | /* channel is not used (interleaved data) */ |
191 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
192 | struct snd_pcm_runtime *runtime = substream->runtime; |
193 | ssize_t b_count = frames_to_bytes(runtime , count); |
194 | ssize_t b_pos = frames_to_bytes(runtime , pos); |
195 | |
196 | if (count < 0) |
197 | return -EINVAL; |
198 | |
199 | if (!count) |
200 | return 0; |
201 | |
202 | memcpy_toio(chip->data_buffer + b_pos, src, b_count); |
203 | chip->buffer_end = chip->data_buffer + b_pos + b_count; |
204 | |
205 | if (chip->empty) { |
206 | chip->empty = 0; |
207 | dac_audio_start_timer(chip); |
208 | } |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream, |
214 | int channel, snd_pcm_uframes_t pos, |
215 | snd_pcm_uframes_t count) |
216 | { |
217 | /* channel is not used (interleaved data) */ |
218 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
219 | struct snd_pcm_runtime *runtime = substream->runtime; |
220 | ssize_t b_count = frames_to_bytes(runtime , count); |
221 | ssize_t b_pos = frames_to_bytes(runtime , pos); |
222 | |
223 | if (count < 0) |
224 | return -EINVAL; |
225 | |
226 | if (!count) |
227 | return 0; |
228 | |
229 | memset_io(chip->data_buffer + b_pos, 0, b_count); |
230 | chip->buffer_end = chip->data_buffer + b_pos + b_count; |
231 | |
232 | if (chip->empty) { |
233 | chip->empty = 0; |
234 | dac_audio_start_timer(chip); |
235 | } |
236 | |
237 | return 0; |
238 | } |
239 | |
240 | static |
241 | snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream) |
242 | { |
243 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
244 | int pointer = chip->buffer_begin - chip->data_buffer; |
245 | |
246 | return pointer; |
247 | } |
248 | |
249 | /* pcm ops */ |
250 | static struct snd_pcm_ops snd_sh_dac_pcm_ops = { |
251 | .open = snd_sh_dac_pcm_open, |
252 | .close = snd_sh_dac_pcm_close, |
253 | .ioctl = snd_pcm_lib_ioctl, |
254 | .hw_params = snd_sh_dac_pcm_hw_params, |
255 | .hw_free = snd_sh_dac_pcm_hw_free, |
256 | .prepare = snd_sh_dac_pcm_prepare, |
257 | .trigger = snd_sh_dac_pcm_trigger, |
258 | .pointer = snd_sh_dac_pcm_pointer, |
259 | .copy = snd_sh_dac_pcm_copy, |
260 | .silence = snd_sh_dac_pcm_silence, |
261 | .mmap = snd_pcm_lib_mmap_iomem, |
262 | }; |
263 | |
264 | static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device) |
265 | { |
266 | int err; |
267 | struct snd_pcm *pcm; |
268 | |
269 | /* device should be always 0 for us */ |
270 | err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm); |
271 | if (err < 0) |
272 | return err; |
273 | |
274 | pcm->private_data = chip; |
275 | strcpy(pcm->name, "SH_DAC PCM"); |
276 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops); |
277 | |
278 | /* buffer size=48K */ |
279 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, |
280 | snd_dma_continuous_data(GFP_KERNEL), |
281 | 48 * 1024, |
282 | 48 * 1024); |
283 | |
284 | return 0; |
285 | } |
286 | /* END OF PCM INTERFACE */ |
287 | |
288 | |
289 | /* driver .remove -- destructor */ |
290 | static int snd_sh_dac_remove(struct platform_device *devptr) |
291 | { |
292 | snd_card_free(platform_get_drvdata(devptr)); |
293 | platform_set_drvdata(devptr, NULL); |
294 | |
295 | return 0; |
296 | } |
297 | |
298 | /* free -- it has been defined by create */ |
299 | static int snd_sh_dac_free(struct snd_sh_dac *chip) |
300 | { |
301 | /* release the data */ |
302 | kfree(chip->data_buffer); |
303 | kfree(chip); |
304 | |
305 | return 0; |
306 | } |
307 | |
308 | static int snd_sh_dac_dev_free(struct snd_device *device) |
309 | { |
310 | struct snd_sh_dac *chip = device->device_data; |
311 | |
312 | return snd_sh_dac_free(chip); |
313 | } |
314 | |
315 | static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle) |
316 | { |
317 | struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac, |
318 | hrtimer); |
319 | struct snd_pcm_runtime *runtime = chip->substream->runtime; |
320 | ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size); |
321 | |
322 | if (!chip->empty) { |
323 | sh_dac_output(*chip->buffer_begin, chip->pdata->channel); |
324 | chip->buffer_begin++; |
325 | |
326 | chip->processed++; |
327 | if (chip->processed >= b_ps) { |
328 | chip->processed -= b_ps; |
329 | snd_pcm_period_elapsed(chip->substream); |
330 | } |
331 | |
332 | if (chip->buffer_begin == (chip->data_buffer + |
333 | chip->buffer_size - 1)) |
334 | chip->buffer_begin = chip->data_buffer; |
335 | |
336 | if (chip->buffer_begin == chip->buffer_end) |
337 | chip->empty = 1; |
338 | |
339 | } |
340 | |
341 | if (!chip->empty) |
342 | hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, |
343 | HRTIMER_MODE_REL); |
344 | |
345 | return HRTIMER_NORESTART; |
346 | } |
347 | |
348 | /* create -- chip-specific constructor for the cards components */ |
349 | static int snd_sh_dac_create(struct snd_card *card, |
350 | struct platform_device *devptr, |
351 | struct snd_sh_dac **rchip) |
352 | { |
353 | struct snd_sh_dac *chip; |
354 | int err; |
355 | |
356 | static struct snd_device_ops ops = { |
357 | .dev_free = snd_sh_dac_dev_free, |
358 | }; |
359 | |
360 | *rchip = NULL; |
361 | |
362 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
363 | if (chip == NULL) |
364 | return -ENOMEM; |
365 | |
366 | chip->card = card; |
367 | |
368 | hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
369 | chip->hrtimer.function = sh_dac_audio_timer; |
370 | |
371 | dac_audio_reset(chip); |
372 | chip->rate = 8000; |
373 | dac_audio_set_rate(chip); |
374 | |
375 | chip->pdata = devptr->dev.platform_data; |
376 | |
377 | chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL); |
378 | if (chip->data_buffer == NULL) { |
379 | kfree(chip); |
380 | return -ENOMEM; |
381 | } |
382 | |
383 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); |
384 | if (err < 0) { |
385 | snd_sh_dac_free(chip); |
386 | return err; |
387 | } |
388 | |
389 | *rchip = chip; |
390 | |
391 | return 0; |
392 | } |
393 | |
394 | /* driver .probe -- constructor */ |
395 | static int snd_sh_dac_probe(struct platform_device *devptr) |
396 | { |
397 | struct snd_sh_dac *chip; |
398 | struct snd_card *card; |
399 | int err; |
400 | |
401 | err = snd_card_create(index, id, THIS_MODULE, 0, &card); |
402 | if (err < 0) { |
403 | snd_printk(KERN_ERR "cannot allocate the card\n"); |
404 | return err; |
405 | } |
406 | |
407 | err = snd_sh_dac_create(card, devptr, &chip); |
408 | if (err < 0) |
409 | goto probe_error; |
410 | |
411 | err = snd_sh_dac_pcm(chip, 0); |
412 | if (err < 0) |
413 | goto probe_error; |
414 | |
415 | strcpy(card->driver, "snd_sh_dac"); |
416 | strcpy(card->shortname, "SuperH DAC audio driver"); |
417 | printk(KERN_INFO "%s %s", card->longname, card->shortname); |
418 | |
419 | err = snd_card_register(card); |
420 | if (err < 0) |
421 | goto probe_error; |
422 | |
423 | snd_printk("ALSA driver for SuperH DAC audio"); |
424 | |
425 | platform_set_drvdata(devptr, card); |
426 | return 0; |
427 | |
428 | probe_error: |
429 | snd_card_free(card); |
430 | return err; |
431 | } |
432 | |
433 | /* |
434 | * "driver" definition |
435 | */ |
436 | static struct platform_driver sh_dac_driver = { |
437 | .probe = snd_sh_dac_probe, |
438 | .remove = snd_sh_dac_remove, |
439 | .driver = { |
440 | .name = "dac_audio", |
441 | .owner = THIS_MODULE, |
442 | }, |
443 | }; |
444 | |
445 | module_platform_driver(sh_dac_driver); |
446 |
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