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Linux/sound/sh/sh_dac_audio.c

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  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 
 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 /* Module Parameters */
 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 /* main struct */
 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; /* bytes proccesed, to compare with period_size */
 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 /* PCM INTERFACE */
 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         /* channel is not used (interleaved data) */
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 
192 static 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         /* channel is not used (interleaved data) */
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 
211 static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
212                                   int channel, unsigned long pos,
213                                   unsigned long count)
214 {
215         /* channel is not used (interleaved data) */
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 
230 static
231 snd_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 /* pcm ops */
240 static 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 
255 static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
256 {
257         int err;
258         struct snd_pcm *pcm;
259 
260         /* device should be always 0 for us */
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         /* buffer size=48K */
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 /* END OF PCM INTERFACE */
278 
279 
280 /* driver .remove  --  destructor */
281 static int snd_sh_dac_remove(struct platform_device *devptr)
282 {
283         snd_card_free(platform_get_drvdata(devptr));
284         return 0;
285 }
286 
287 /* free -- it has been defined by create */
288 static int snd_sh_dac_free(struct snd_sh_dac *chip)
289 {
290         /* release the data */
291         kfree(chip->data_buffer);
292         kfree(chip);
293 
294         return 0;
295 }
296 
297 static 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 
304 static 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 /* create  --  chip-specific constructor for the cards components */
338 static 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 /* driver .probe  --  constructor */
384 static 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 
417 probe_error:
418         snd_card_free(card);
419         return err;
420 }
421 
422 /*
423  * "driver" definition
424  */
425 static 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 
433 module_platform_driver(sh_dac_driver);
434 

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