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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
25MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
26MODULE_DESCRIPTION("SuperH DAC audio driver");
27MODULE_LICENSE("GPL");
28MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
29
30
31static int index = SNDRV_DEFAULT_IDX1;
32static char *id = SNDRV_DEFAULT_STR1;
33module_param(index, int, 0444);
34MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
35module_param(id, charp, 0444);
36MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
37
38
39struct 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
54static 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
60static void dac_audio_stop_timer(struct snd_sh_dac *chip)
61{
62 hrtimer_cancel(&chip->hrtimer);
63}
64
65static 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
73static void dac_audio_set_rate(struct snd_sh_dac *chip)
74{
75 chip->wakeups_per_second = 1000000000 / chip->rate;
76}
77
78
79
80
81static 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
99static 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
116static 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
128static 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
135static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
136{
137 return snd_pcm_lib_free_pages(substream);
138}
139
140static 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
151static 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
172static 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 struct snd_pcm_runtime *runtime = substream->runtime;
179
180 if (copy_from_user_toio(chip->data_buffer + pos, src, count))
181 return -EFAULT;
182 chip->buffer_end = chip->data_buffer + pos + count;
183
184 if (chip->empty) {
185 chip->empty = 0;
186 dac_audio_start_timer(chip);
187 }
188
189 return 0;
190}
191
192static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
193 int channel, unsigned long pos,
194 void *src, unsigned long count)
195{
196
197 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
198 struct snd_pcm_runtime *runtime = substream->runtime;
199
200 memcpy_toio(chip->data_buffer + pos, src, count);
201 chip->buffer_end = chip->data_buffer + pos + count;
202
203 if (chip->empty) {
204 chip->empty = 0;
205 dac_audio_start_timer(chip);
206 }
207
208 return 0;
209}
210
211static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
212 int channel, unsigned long pos,
213 unsigned long count)
214{
215
216 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
217 struct snd_pcm_runtime *runtime = substream->runtime;
218
219 memset_io(chip->data_buffer + pos, 0, count);
220 chip->buffer_end = chip->data_buffer + pos + count;
221
222 if (chip->empty) {
223 chip->empty = 0;
224 dac_audio_start_timer(chip);
225 }
226
227 return 0;
228}
229
230static
231snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
232{
233 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
234 int pointer = chip->buffer_begin - chip->data_buffer;
235
236 return pointer;
237}
238
239
240static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
241 .open = snd_sh_dac_pcm_open,
242 .close = snd_sh_dac_pcm_close,
243 .ioctl = snd_pcm_lib_ioctl,
244 .hw_params = snd_sh_dac_pcm_hw_params,
245 .hw_free = snd_sh_dac_pcm_hw_free,
246 .prepare = snd_sh_dac_pcm_prepare,
247 .trigger = snd_sh_dac_pcm_trigger,
248 .pointer = snd_sh_dac_pcm_pointer,
249 .copy_user = snd_sh_dac_pcm_copy,
250 .copy_kernel = snd_sh_dac_pcm_copy_kernel,
251 .fill_silence = snd_sh_dac_pcm_silence,
252 .mmap = snd_pcm_lib_mmap_iomem,
253};
254
255static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
256{
257 int err;
258 struct snd_pcm *pcm;
259
260
261 err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
262 if (err < 0)
263 return err;
264
265 pcm->private_data = chip;
266 strcpy(pcm->name, "SH_DAC PCM");
267 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
268
269
270 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
271 snd_dma_continuous_data(GFP_KERNEL),
272 48 * 1024,
273 48 * 1024);
274
275 return 0;
276}
277
278
279
280
281static int snd_sh_dac_remove(struct platform_device *devptr)
282{
283 snd_card_free(platform_get_drvdata(devptr));
284 return 0;
285}
286
287
288static int snd_sh_dac_free(struct snd_sh_dac *chip)
289{
290
291 kfree(chip->data_buffer);
292 kfree(chip);
293
294 return 0;
295}
296
297static int snd_sh_dac_dev_free(struct snd_device *device)
298{
299 struct snd_sh_dac *chip = device->device_data;
300
301 return snd_sh_dac_free(chip);
302}
303
304static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
305{
306 struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
307 hrtimer);
308 struct snd_pcm_runtime *runtime = chip->substream->runtime;
309 ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
310
311 if (!chip->empty) {
312 sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
313 chip->buffer_begin++;
314
315 chip->processed++;
316 if (chip->processed >= b_ps) {
317 chip->processed -= b_ps;
318 snd_pcm_period_elapsed(chip->substream);
319 }
320
321 if (chip->buffer_begin == (chip->data_buffer +
322 chip->buffer_size - 1))
323 chip->buffer_begin = chip->data_buffer;
324
325 if (chip->buffer_begin == chip->buffer_end)
326 chip->empty = 1;
327
328 }
329
330 if (!chip->empty)
331 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
332 HRTIMER_MODE_REL);
333
334 return HRTIMER_NORESTART;
335}
336
337
338static int snd_sh_dac_create(struct snd_card *card,
339 struct platform_device *devptr,
340 struct snd_sh_dac **rchip)
341{
342 struct snd_sh_dac *chip;
343 int err;
344
345 static struct snd_device_ops ops = {
346 .dev_free = snd_sh_dac_dev_free,
347 };
348
349 *rchip = NULL;
350
351 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
352 if (chip == NULL)
353 return -ENOMEM;
354
355 chip->card = card;
356
357 hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
358 chip->hrtimer.function = sh_dac_audio_timer;
359
360 dac_audio_reset(chip);
361 chip->rate = 8000;
362 dac_audio_set_rate(chip);
363
364 chip->pdata = devptr->dev.platform_data;
365
366 chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
367 if (chip->data_buffer == NULL) {
368 kfree(chip);
369 return -ENOMEM;
370 }
371
372 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
373 if (err < 0) {
374 snd_sh_dac_free(chip);
375 return err;
376 }
377
378 *rchip = chip;
379
380 return 0;
381}
382
383
384static int snd_sh_dac_probe(struct platform_device *devptr)
385{
386 struct snd_sh_dac *chip;
387 struct snd_card *card;
388 int err;
389
390 err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
391 if (err < 0) {
392 snd_printk(KERN_ERR "cannot allocate the card\n");
393 return err;
394 }
395
396 err = snd_sh_dac_create(card, devptr, &chip);
397 if (err < 0)
398 goto probe_error;
399
400 err = snd_sh_dac_pcm(chip, 0);
401 if (err < 0)
402 goto probe_error;
403
404 strcpy(card->driver, "snd_sh_dac");
405 strcpy(card->shortname, "SuperH DAC audio driver");
406 printk(KERN_INFO "%s %s", card->longname, card->shortname);
407
408 err = snd_card_register(card);
409 if (err < 0)
410 goto probe_error;
411
412 snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
413
414 platform_set_drvdata(devptr, card);
415 return 0;
416
417probe_error:
418 snd_card_free(card);
419 return err;
420}
421
422
423
424
425static struct platform_driver sh_dac_driver = {
426 .probe = snd_sh_dac_probe,
427 .remove = snd_sh_dac_remove,
428 .driver = {
429 .name = "dac_audio",
430 },
431};
432
433module_platform_driver(sh_dac_driver);
434
