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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
40MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
41MODULE_DESCRIPTION("SuperH DAC audio driver");
42MODULE_LICENSE("GPL");
43MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
44
45/* Module Parameters */
46static int index = SNDRV_DEFAULT_IDX1;
47static char *id = SNDRV_DEFAULT_STR1;
48module_param(index, int, 0444);
49MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
50module_param(id, charp, 0444);
51MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
52
53/* main struct */
54struct 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
69static 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
75static void dac_audio_stop_timer(struct snd_sh_dac *chip)
76{
77 hrtimer_cancel(&chip->hrtimer);
78}
79
80static 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
88static void dac_audio_set_rate(struct snd_sh_dac *chip)
89{
90 chip->wakeups_per_second = 1000000000 / chip->rate;
91}
92
93
94/* PCM INTERFACE */
95
96static const 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
114static 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
131static 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
143static 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
150static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
151{
152 return snd_pcm_lib_free_pages(substream);
153}
154
155static 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
166static 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
187static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
188 int channel, unsigned long pos,
189 void __user *src, unsigned long count)
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;
194
195 if (copy_from_user_toio(chip->data_buffer + pos, src, count))
196 return -EFAULT;
197 chip->buffer_end = chip->data_buffer + pos + count;
198
199 if (chip->empty) {
200 chip->empty = 0;
201 dac_audio_start_timer(chip);
202 }
203
204 return 0;
205}
206
207static 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;
217
218 if (chip->empty) {
219 chip->empty = 0;
220 dac_audio_start_timer(chip);
221 }
222
223 return 0;
224}
225
226static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
227 int channel, unsigned long pos,
228 unsigned long count)
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;
233
234 memset_io(chip->data_buffer + pos, 0, count);
235 chip->buffer_end = chip->data_buffer + pos + count;
236
237 if (chip->empty) {
238 chip->empty = 0;
239 dac_audio_start_timer(chip);
240 }
241
242 return 0;
243}
244
245static
246snd_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 */
255static const 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,
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,
267 .mmap = snd_pcm_lib_mmap_iomem,
268};
269
270static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
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 */
296static int snd_sh_dac_remove(struct platform_device *devptr)
297{
298 snd_card_free(platform_get_drvdata(devptr));
299 return 0;
300}
301
302/* free -- it has been defined by create */
303static 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
312static 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
319static 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 */
353static int snd_sh_dac_create(struct snd_card *card,
354 struct platform_device *devptr,
355 struct snd_sh_dac **rchip)
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 */
399static int snd_sh_dac_probe(struct platform_device *devptr)
400{
401 struct snd_sh_dac *chip;
402 struct snd_card *card;
403 int err;
404
405 err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
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(KERN_INFO "ALSA driver for SuperH DAC audio");
428
429 platform_set_drvdata(devptr, card);
430 return 0;
431
432probe_error:
433 snd_card_free(card);
434 return err;
435}
436
437/*
438 * "driver" definition
439 */
440static struct platform_driver sh_dac_driver = {
441 .probe = snd_sh_dac_probe,
442 .remove = snd_sh_dac_remove,
443 .driver = {
444 .name = "dac_audio",
445 },
446};
447
448module_platform_driver(sh_dac_driver);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sh_dac_audio.c - SuperH DAC audio driver for ALSA
4 *
5 * Copyright (c) 2009 by Rafael Ignacio Zurita <rizurita@yahoo.com>
6 *
7 * Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh)
8 */
9
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");
28
29/* Module Parameters */
30static int index = SNDRV_DEFAULT_IDX1;
31static char *id = SNDRV_DEFAULT_STR1;
32module_param(index, int, 0444);
33MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
34module_param(id, charp, 0444);
35MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
36
37/* main struct */
38struct snd_sh_dac {
39 struct snd_card *card;
40 struct snd_pcm_substream *substream;
41 struct hrtimer hrtimer;
42 ktime_t wakeups_per_second;
43
44 int rate;
45 int empty;
46 char *data_buffer, *buffer_begin, *buffer_end;
47 int processed; /* bytes proccesed, to compare with period_size */
48 int buffer_size;
49 struct dac_audio_pdata *pdata;
50};
51
52
53static void dac_audio_start_timer(struct snd_sh_dac *chip)
54{
55 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
56 HRTIMER_MODE_REL);
57}
58
59static void dac_audio_stop_timer(struct snd_sh_dac *chip)
60{
61 hrtimer_cancel(&chip->hrtimer);
62}
63
64static void dac_audio_reset(struct snd_sh_dac *chip)
65{
66 dac_audio_stop_timer(chip);
67 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
68 chip->processed = 0;
69 chip->empty = 1;
70}
71
72static void dac_audio_set_rate(struct snd_sh_dac *chip)
73{
74 chip->wakeups_per_second = 1000000000 / chip->rate;
75}
76
77
78/* PCM INTERFACE */
79
80static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
81 .info = (SNDRV_PCM_INFO_MMAP |
82 SNDRV_PCM_INFO_MMAP_VALID |
83 SNDRV_PCM_INFO_INTERLEAVED |
84 SNDRV_PCM_INFO_HALF_DUPLEX),
85 .formats = SNDRV_PCM_FMTBIT_U8,
86 .rates = SNDRV_PCM_RATE_8000,
87 .rate_min = 8000,
88 .rate_max = 8000,
89 .channels_min = 1,
90 .channels_max = 1,
91 .buffer_bytes_max = (48*1024),
92 .period_bytes_min = 1,
93 .period_bytes_max = (48*1024),
94 .periods_min = 1,
95 .periods_max = 1024,
96};
97
98static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
99{
100 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
101 struct snd_pcm_runtime *runtime = substream->runtime;
102
103 runtime->hw = snd_sh_dac_pcm_hw;
104
105 chip->substream = substream;
106 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
107 chip->processed = 0;
108 chip->empty = 1;
109
110 chip->pdata->start(chip->pdata);
111
112 return 0;
113}
114
115static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
116{
117 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
118
119 chip->substream = NULL;
120
121 dac_audio_stop_timer(chip);
122 chip->pdata->stop(chip->pdata);
123
124 return 0;
125}
126
127static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
128{
129 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
130 struct snd_pcm_runtime *runtime = chip->substream->runtime;
131
132 chip->buffer_size = runtime->buffer_size;
133 memset(chip->data_buffer, 0, chip->pdata->buffer_size);
134
135 return 0;
136}
137
138static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
139{
140 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
141
142 switch (cmd) {
143 case SNDRV_PCM_TRIGGER_START:
144 dac_audio_start_timer(chip);
145 break;
146 case SNDRV_PCM_TRIGGER_STOP:
147 chip->buffer_begin = chip->buffer_end = chip->data_buffer;
148 chip->processed = 0;
149 chip->empty = 1;
150 dac_audio_stop_timer(chip);
151 break;
152 default:
153 return -EINVAL;
154 }
155
156 return 0;
157}
158
159static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
160 int channel, unsigned long pos,
161 struct iov_iter *src, unsigned long count)
162{
163 /* channel is not used (interleaved data) */
164 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
165
166 if (copy_from_iter_toio(chip->data_buffer + pos, src, count))
167 return -EFAULT;
168 chip->buffer_end = chip->data_buffer + pos + count;
169
170 if (chip->empty) {
171 chip->empty = 0;
172 dac_audio_start_timer(chip);
173 }
174
175 return 0;
176}
177
178static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
179 int channel, unsigned long pos,
180 unsigned long count)
181{
182 /* channel is not used (interleaved data) */
183 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
184
185 memset_io(chip->data_buffer + pos, 0, count);
186 chip->buffer_end = chip->data_buffer + pos + count;
187
188 if (chip->empty) {
189 chip->empty = 0;
190 dac_audio_start_timer(chip);
191 }
192
193 return 0;
194}
195
196static
197snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
198{
199 struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
200 int pointer = chip->buffer_begin - chip->data_buffer;
201
202 return pointer;
203}
204
205/* pcm ops */
206static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
207 .open = snd_sh_dac_pcm_open,
208 .close = snd_sh_dac_pcm_close,
209 .prepare = snd_sh_dac_pcm_prepare,
210 .trigger = snd_sh_dac_pcm_trigger,
211 .pointer = snd_sh_dac_pcm_pointer,
212 .copy = snd_sh_dac_pcm_copy,
213 .fill_silence = snd_sh_dac_pcm_silence,
214 .mmap = snd_pcm_lib_mmap_iomem,
215};
216
217static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
218{
219 int err;
220 struct snd_pcm *pcm;
221
222 /* device should be always 0 for us */
223 err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
224 if (err < 0)
225 return err;
226
227 pcm->private_data = chip;
228 strcpy(pcm->name, "SH_DAC PCM");
229 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
230
231 /* buffer size=48K */
232 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
233 NULL, 48 * 1024, 48 * 1024);
234
235 return 0;
236}
237/* END OF PCM INTERFACE */
238
239
240/* driver .remove -- destructor */
241static void snd_sh_dac_remove(struct platform_device *devptr)
242{
243 snd_card_free(platform_get_drvdata(devptr));
244}
245
246/* free -- it has been defined by create */
247static int snd_sh_dac_free(struct snd_sh_dac *chip)
248{
249 /* release the data */
250 kfree(chip->data_buffer);
251 kfree(chip);
252
253 return 0;
254}
255
256static int snd_sh_dac_dev_free(struct snd_device *device)
257{
258 struct snd_sh_dac *chip = device->device_data;
259
260 return snd_sh_dac_free(chip);
261}
262
263static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
264{
265 struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
266 hrtimer);
267 struct snd_pcm_runtime *runtime = chip->substream->runtime;
268 ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
269
270 if (!chip->empty) {
271 sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
272 chip->buffer_begin++;
273
274 chip->processed++;
275 if (chip->processed >= b_ps) {
276 chip->processed -= b_ps;
277 snd_pcm_period_elapsed(chip->substream);
278 }
279
280 if (chip->buffer_begin == (chip->data_buffer +
281 chip->buffer_size - 1))
282 chip->buffer_begin = chip->data_buffer;
283
284 if (chip->buffer_begin == chip->buffer_end)
285 chip->empty = 1;
286
287 }
288
289 if (!chip->empty)
290 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
291 HRTIMER_MODE_REL);
292
293 return HRTIMER_NORESTART;
294}
295
296/* create -- chip-specific constructor for the cards components */
297static int snd_sh_dac_create(struct snd_card *card,
298 struct platform_device *devptr,
299 struct snd_sh_dac **rchip)
300{
301 struct snd_sh_dac *chip;
302 int err;
303
304 static const struct snd_device_ops ops = {
305 .dev_free = snd_sh_dac_dev_free,
306 };
307
308 *rchip = NULL;
309
310 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
311 if (chip == NULL)
312 return -ENOMEM;
313
314 chip->card = card;
315
316 hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
317 chip->hrtimer.function = sh_dac_audio_timer;
318
319 dac_audio_reset(chip);
320 chip->rate = 8000;
321 dac_audio_set_rate(chip);
322
323 chip->pdata = devptr->dev.platform_data;
324
325 chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
326 if (chip->data_buffer == NULL) {
327 kfree(chip);
328 return -ENOMEM;
329 }
330
331 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
332 if (err < 0) {
333 snd_sh_dac_free(chip);
334 return err;
335 }
336
337 *rchip = chip;
338
339 return 0;
340}
341
342/* driver .probe -- constructor */
343static int snd_sh_dac_probe(struct platform_device *devptr)
344{
345 struct snd_sh_dac *chip;
346 struct snd_card *card;
347 int err;
348
349 err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
350 if (err < 0) {
351 snd_printk(KERN_ERR "cannot allocate the card\n");
352 return err;
353 }
354
355 err = snd_sh_dac_create(card, devptr, &chip);
356 if (err < 0)
357 goto probe_error;
358
359 err = snd_sh_dac_pcm(chip, 0);
360 if (err < 0)
361 goto probe_error;
362
363 strcpy(card->driver, "snd_sh_dac");
364 strcpy(card->shortname, "SuperH DAC audio driver");
365 printk(KERN_INFO "%s %s", card->longname, card->shortname);
366
367 err = snd_card_register(card);
368 if (err < 0)
369 goto probe_error;
370
371 snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
372
373 platform_set_drvdata(devptr, card);
374 return 0;
375
376probe_error:
377 snd_card_free(card);
378 return err;
379}
380
381/*
382 * "driver" definition
383 */
384static struct platform_driver sh_dac_driver = {
385 .probe = snd_sh_dac_probe,
386 .remove_new = snd_sh_dac_remove,
387 .driver = {
388 .name = "dac_audio",
389 },
390};
391
392module_platform_driver(sh_dac_driver);