This source file includes following definitions.
- dac_audio_start_timer
- dac_audio_stop_timer
- dac_audio_reset
- dac_audio_set_rate
- snd_sh_dac_pcm_open
- snd_sh_dac_pcm_close
- snd_sh_dac_pcm_hw_params
- snd_sh_dac_pcm_hw_free
- snd_sh_dac_pcm_prepare
- snd_sh_dac_pcm_trigger
- snd_sh_dac_pcm_copy
- snd_sh_dac_pcm_copy_kernel
- snd_sh_dac_pcm_silence
- snd_sh_dac_pcm_pointer
- snd_sh_dac_pcm
- snd_sh_dac_remove
- snd_sh_dac_free
- snd_sh_dac_dev_free
- sh_dac_audio_timer
- snd_sh_dac_create
- snd_sh_dac_probe
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10 #include <linux/hrtimer.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <sound/core.h>
17 #include <sound/initval.h>
18 #include <sound/pcm.h>
19 #include <sound/sh_dac_audio.h>
20 #include <asm/clock.h>
21 #include <asm/hd64461.h>
22 #include <mach/hp6xx.h>
23 #include <cpu/dac.h>
24
25 MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
26 MODULE_DESCRIPTION("SuperH DAC audio driver");
27 MODULE_LICENSE("GPL");
28 MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
29
30
31 static int index = SNDRV_DEFAULT_IDX1;
32 static char *id = SNDRV_DEFAULT_STR1;
33 module_param(index, int, 0444);
34 MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
35 module_param(id, charp, 0444);
36 MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
37
38
39 struct snd_sh_dac {
40 struct snd_card *card;
41 struct snd_pcm_substream *substream;
42 struct hrtimer hrtimer;
43 ktime_t wakeups_per_second;
44
45 int rate;
46 int empty;
47 char *data_buffer, *buffer_begin, *buffer_end;
48 int processed;
49 int buffer_size;
50 struct dac_audio_pdata *pdata;
51 };
52
53
54 static void dac_audio_start_timer(struct snd_sh_dac *chip)
55 {
56 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
57 HRTIMER_MODE_REL);
58 }
59
60 static void dac_audio_stop_timer(struct snd_sh_dac *chip)
61 {
62 hrtimer_cancel(&chip->hrtimer);
63 }
64
65 static void dac_audio_reset(struct snd_sh_dac *chip)
66 {
67 dac_audio_stop_timer(chip);
68 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
69 chip->processed = 0;
70 chip->empty = 1;
71 }
72
73 static void dac_audio_set_rate(struct snd_sh_dac *chip)
74 {
75 chip->wakeups_per_second = 1000000000 / chip->rate;
76 }
77
78
79
80
81 static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
82 .info = (SNDRV_PCM_INFO_MMAP |
83 SNDRV_PCM_INFO_MMAP_VALID |
84 SNDRV_PCM_INFO_INTERLEAVED |
85 SNDRV_PCM_INFO_HALF_DUPLEX),
86 .formats = SNDRV_PCM_FMTBIT_U8,
87 .rates = SNDRV_PCM_RATE_8000,
88 .rate_min = 8000,
89 .rate_max = 8000,
90 .channels_min = 1,
91 .channels_max = 1,
92 .buffer_bytes_max = (48*1024),
93 .period_bytes_min = 1,
94 .period_bytes_max = (48*1024),
95 .periods_min = 1,
96 .periods_max = 1024,
97 };
98
99 static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
100 {
101 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
102 struct snd_pcm_runtime *runtime = substream->runtime;
103
104 runtime->hw = snd_sh_dac_pcm_hw;
105
106 chip->substream = substream;
107 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
108 chip->processed = 0;
109 chip->empty = 1;
110
111 chip->pdata->start(chip->pdata);
112
113 return 0;
114 }
115
116 static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
117 {
118 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
119
120 chip->substream = NULL;
121
122 dac_audio_stop_timer(chip);
123 chip->pdata->stop(chip->pdata);
124
125 return 0;
126 }
127
128 static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream,
129 struct snd_pcm_hw_params *hw_params)
130 {
131 return snd_pcm_lib_malloc_pages(substream,
132 params_buffer_bytes(hw_params));
133 }
134
135 static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
136 {
137 return snd_pcm_lib_free_pages(substream);
138 }
139
140 static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
141 {
142 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
143 struct snd_pcm_runtime *runtime = chip->substream->runtime;
144
145 chip->buffer_size = runtime->buffer_size;
146 memset(chip->data_buffer, 0, chip->pdata->buffer_size);
147
148 return 0;
149 }
150
151 static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
152 {
153 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
154
155 switch (cmd) {
156 case SNDRV_PCM_TRIGGER_START:
157 dac_audio_start_timer(chip);
158 break;
159 case SNDRV_PCM_TRIGGER_STOP:
160 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
161 chip->processed = 0;
162 chip->empty = 1;
163 dac_audio_stop_timer(chip);
164 break;
165 default:
166 return -EINVAL;
167 }
168
169 return 0;
170 }
171
172 static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
173 int channel, unsigned long pos,
174 void __user *src, unsigned long count)
175 {
176
177 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
178
179 if (copy_from_user_toio(chip->data_buffer + pos, src, count))
180 return -EFAULT;
181 chip->buffer_end = chip->data_buffer + pos + count;
182
183 if (chip->empty) {
184 chip->empty = 0;
185 dac_audio_start_timer(chip);
186 }
187
188 return 0;
189 }
190
191 static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
192 int channel, unsigned long pos,
193 void *src, unsigned long count)
194 {
195
196 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
197
198 memcpy_toio(chip->data_buffer + pos, src, count);
199 chip->buffer_end = chip->data_buffer + pos + count;
200
201 if (chip->empty) {
202 chip->empty = 0;
203 dac_audio_start_timer(chip);
204 }
205
206 return 0;
207 }
208
209 static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
210 int channel, unsigned long pos,
211 unsigned long count)
212 {
213
214 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
215
216 memset_io(chip->data_buffer + pos, 0, count);
217 chip->buffer_end = chip->data_buffer + pos + count;
218
219 if (chip->empty) {
220 chip->empty = 0;
221 dac_audio_start_timer(chip);
222 }
223
224 return 0;
225 }
226
227 static
228 snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
229 {
230 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
231 int pointer = chip->buffer_begin - chip->data_buffer;
232
233 return pointer;
234 }
235
236
237 static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
238 .open = snd_sh_dac_pcm_open,
239 .close = snd_sh_dac_pcm_close,
240 .ioctl = snd_pcm_lib_ioctl,
241 .hw_params = snd_sh_dac_pcm_hw_params,
242 .hw_free = snd_sh_dac_pcm_hw_free,
243 .prepare = snd_sh_dac_pcm_prepare,
244 .trigger = snd_sh_dac_pcm_trigger,
245 .pointer = snd_sh_dac_pcm_pointer,
246 .copy_user = snd_sh_dac_pcm_copy,
247 .copy_kernel = snd_sh_dac_pcm_copy_kernel,
248 .fill_silence = snd_sh_dac_pcm_silence,
249 .mmap = snd_pcm_lib_mmap_iomem,
250 };
251
252 static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
253 {
254 int err;
255 struct snd_pcm *pcm;
256
257
258 err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
259 if (err < 0)
260 return err;
261
262 pcm->private_data = chip;
263 strcpy(pcm->name, "SH_DAC PCM");
264 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
265
266
267 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
268 snd_dma_continuous_data(GFP_KERNEL),
269 48 * 1024,
270 48 * 1024);
271
272 return 0;
273 }
274
275
276
277
278 static int snd_sh_dac_remove(struct platform_device *devptr)
279 {
280 snd_card_free(platform_get_drvdata(devptr));
281 return 0;
282 }
283
284
285 static int snd_sh_dac_free(struct snd_sh_dac *chip)
286 {
287
288 kfree(chip->data_buffer);
289 kfree(chip);
290
291 return 0;
292 }
293
294 static int snd_sh_dac_dev_free(struct snd_device *device)
295 {
296 struct snd_sh_dac *chip = device->device_data;
297
298 return snd_sh_dac_free(chip);
299 }
300
301 static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
302 {
303 struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
304 hrtimer);
305 struct snd_pcm_runtime *runtime = chip->substream->runtime;
306 ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
307
308 if (!chip->empty) {
309 sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
310 chip->buffer_begin++;
311
312 chip->processed++;
313 if (chip->processed >= b_ps) {
314 chip->processed -= b_ps;
315 snd_pcm_period_elapsed(chip->substream);
316 }
317
318 if (chip->buffer_begin == (chip->data_buffer +
319 chip->buffer_size - 1))
320 chip->buffer_begin = chip->data_buffer;
321
322 if (chip->buffer_begin == chip->buffer_end)
323 chip->empty = 1;
324
325 }
326
327 if (!chip->empty)
328 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
329 HRTIMER_MODE_REL);
330
331 return HRTIMER_NORESTART;
332 }
333
334
335 static int snd_sh_dac_create(struct snd_card *card,
336 struct platform_device *devptr,
337 struct snd_sh_dac **rchip)
338 {
339 struct snd_sh_dac *chip;
340 int err;
341
342 static struct snd_device_ops ops = {
343 .dev_free = snd_sh_dac_dev_free,
344 };
345
346 *rchip = NULL;
347
348 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
349 if (chip == NULL)
350 return -ENOMEM;
351
352 chip->card = card;
353
354 hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
355 chip->hrtimer.function = sh_dac_audio_timer;
356
357 dac_audio_reset(chip);
358 chip->rate = 8000;
359 dac_audio_set_rate(chip);
360
361 chip->pdata = devptr->dev.platform_data;
362
363 chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
364 if (chip->data_buffer == NULL) {
365 kfree(chip);
366 return -ENOMEM;
367 }
368
369 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
370 if (err < 0) {
371 snd_sh_dac_free(chip);
372 return err;
373 }
374
375 *rchip = chip;
376
377 return 0;
378 }
379
380
381 static int snd_sh_dac_probe(struct platform_device *devptr)
382 {
383 struct snd_sh_dac *chip;
384 struct snd_card *card;
385 int err;
386
387 err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
388 if (err < 0) {
389 snd_printk(KERN_ERR "cannot allocate the card\n");
390 return err;
391 }
392
393 err = snd_sh_dac_create(card, devptr, &chip);
394 if (err < 0)
395 goto probe_error;
396
397 err = snd_sh_dac_pcm(chip, 0);
398 if (err < 0)
399 goto probe_error;
400
401 strcpy(card->driver, "snd_sh_dac");
402 strcpy(card->shortname, "SuperH DAC audio driver");
403 printk(KERN_INFO "%s %s", card->longname, card->shortname);
404
405 err = snd_card_register(card);
406 if (err < 0)
407 goto probe_error;
408
409 snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
410
411 platform_set_drvdata(devptr, card);
412 return 0;
413
414 probe_error:
415 snd_card_free(card);
416 return err;
417 }
418
419
420
421
422 static struct platform_driver sh_dac_driver = {
423 .probe = snd_sh_dac_probe,
424 .remove = snd_sh_dac_remove,
425 .driver = {
426 .name = "dac_audio",
427 },
428 };
429
430 module_platform_driver(sh_dac_driver);