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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9dcaa7b2 RIZ |
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 | * | |
9dcaa7b2 | 7 | * Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh) |
9dcaa7b2 RIZ |
8 | */ |
9 | ||
10 | #include <linux/hrtimer.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/platform_device.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
da155d5b | 15 | #include <linux/module.h> |
9dcaa7b2 RIZ |
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 | { | |
8b0e1953 | 75 | chip->wakeups_per_second = 1000000000 / chip->rate; |
9dcaa7b2 RIZ |
76 | } |
77 | ||
78 | ||
79 | /* PCM INTERFACE */ | |
80 | ||
cd196fe2 | 81 | static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = { |
9dcaa7b2 RIZ |
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 | ||
9dcaa7b2 RIZ |
128 | static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream) |
129 | { | |
130 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
131 | struct snd_pcm_runtime *runtime = chip->substream->runtime; | |
132 | ||
133 | chip->buffer_size = runtime->buffer_size; | |
134 | memset(chip->data_buffer, 0, chip->pdata->buffer_size); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
140 | { | |
141 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
142 | ||
143 | switch (cmd) { | |
144 | case SNDRV_PCM_TRIGGER_START: | |
145 | dac_audio_start_timer(chip); | |
146 | break; | |
147 | case SNDRV_PCM_TRIGGER_STOP: | |
148 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; | |
149 | chip->processed = 0; | |
150 | chip->empty = 1; | |
151 | dac_audio_stop_timer(chip); | |
152 | break; | |
153 | default: | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
1cc2f8ba TI |
160 | static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, |
161 | int channel, unsigned long pos, | |
162 | void __user *src, unsigned long count) | |
9dcaa7b2 RIZ |
163 | { |
164 | /* channel is not used (interleaved data) */ | |
165 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
166 | struct snd_pcm_runtime *runtime = substream->runtime; | |
9dcaa7b2 | 167 | |
1cc2f8ba TI |
168 | if (copy_from_user_toio(chip->data_buffer + pos, src, count)) |
169 | return -EFAULT; | |
170 | chip->buffer_end = chip->data_buffer + pos + count; | |
9dcaa7b2 | 171 | |
1cc2f8ba TI |
172 | if (chip->empty) { |
173 | chip->empty = 0; | |
174 | dac_audio_start_timer(chip); | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
9dcaa7b2 | 179 | |
1cc2f8ba TI |
180 | static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream, |
181 | int channel, unsigned long pos, | |
182 | void *src, unsigned long count) | |
183 | { | |
184 | /* channel is not used (interleaved data) */ | |
185 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
186 | struct snd_pcm_runtime *runtime = substream->runtime; | |
187 | ||
188 | memcpy_toio(chip->data_buffer + pos, src, count); | |
189 | chip->buffer_end = chip->data_buffer + pos + count; | |
9dcaa7b2 RIZ |
190 | |
191 | if (chip->empty) { | |
192 | chip->empty = 0; | |
193 | dac_audio_start_timer(chip); | |
194 | } | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream, | |
1cc2f8ba TI |
200 | int channel, unsigned long pos, |
201 | unsigned long count) | |
9dcaa7b2 RIZ |
202 | { |
203 | /* channel is not used (interleaved data) */ | |
204 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
205 | struct snd_pcm_runtime *runtime = substream->runtime; | |
9dcaa7b2 | 206 | |
1cc2f8ba TI |
207 | memset_io(chip->data_buffer + pos, 0, count); |
208 | chip->buffer_end = chip->data_buffer + pos + count; | |
9dcaa7b2 RIZ |
209 | |
210 | if (chip->empty) { | |
211 | chip->empty = 0; | |
212 | dac_audio_start_timer(chip); | |
213 | } | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static | |
219 | snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream) | |
220 | { | |
221 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); | |
222 | int pointer = chip->buffer_begin - chip->data_buffer; | |
223 | ||
224 | return pointer; | |
225 | } | |
226 | ||
227 | /* pcm ops */ | |
46a085a3 | 228 | static const struct snd_pcm_ops snd_sh_dac_pcm_ops = { |
9dcaa7b2 RIZ |
229 | .open = snd_sh_dac_pcm_open, |
230 | .close = snd_sh_dac_pcm_close, | |
9dcaa7b2 RIZ |
231 | .prepare = snd_sh_dac_pcm_prepare, |
232 | .trigger = snd_sh_dac_pcm_trigger, | |
233 | .pointer = snd_sh_dac_pcm_pointer, | |
1cc2f8ba TI |
234 | .copy_user = snd_sh_dac_pcm_copy, |
235 | .copy_kernel = snd_sh_dac_pcm_copy_kernel, | |
236 | .fill_silence = snd_sh_dac_pcm_silence, | |
9dcaa7b2 RIZ |
237 | .mmap = snd_pcm_lib_mmap_iomem, |
238 | }; | |
239 | ||
e74033a8 | 240 | static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device) |
9dcaa7b2 RIZ |
241 | { |
242 | int err; | |
243 | struct snd_pcm *pcm; | |
244 | ||
245 | /* device should be always 0 for us */ | |
246 | err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm); | |
247 | if (err < 0) | |
248 | return err; | |
249 | ||
250 | pcm->private_data = chip; | |
251 | strcpy(pcm->name, "SH_DAC PCM"); | |
252 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops); | |
253 | ||
254 | /* buffer size=48K */ | |
50cdf3a0 TI |
255 | snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, |
256 | NULL, 48 * 1024, 48 * 1024); | |
9dcaa7b2 RIZ |
257 | |
258 | return 0; | |
259 | } | |
260 | /* END OF PCM INTERFACE */ | |
261 | ||
262 | ||
263 | /* driver .remove -- destructor */ | |
264 | static int snd_sh_dac_remove(struct platform_device *devptr) | |
265 | { | |
266 | snd_card_free(platform_get_drvdata(devptr)); | |
9dcaa7b2 RIZ |
267 | return 0; |
268 | } | |
269 | ||
270 | /* free -- it has been defined by create */ | |
271 | static int snd_sh_dac_free(struct snd_sh_dac *chip) | |
272 | { | |
273 | /* release the data */ | |
274 | kfree(chip->data_buffer); | |
275 | kfree(chip); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int snd_sh_dac_dev_free(struct snd_device *device) | |
281 | { | |
282 | struct snd_sh_dac *chip = device->device_data; | |
283 | ||
284 | return snd_sh_dac_free(chip); | |
285 | } | |
286 | ||
287 | static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle) | |
288 | { | |
289 | struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac, | |
290 | hrtimer); | |
291 | struct snd_pcm_runtime *runtime = chip->substream->runtime; | |
292 | ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size); | |
293 | ||
294 | if (!chip->empty) { | |
295 | sh_dac_output(*chip->buffer_begin, chip->pdata->channel); | |
296 | chip->buffer_begin++; | |
297 | ||
298 | chip->processed++; | |
299 | if (chip->processed >= b_ps) { | |
300 | chip->processed -= b_ps; | |
301 | snd_pcm_period_elapsed(chip->substream); | |
302 | } | |
303 | ||
304 | if (chip->buffer_begin == (chip->data_buffer + | |
305 | chip->buffer_size - 1)) | |
306 | chip->buffer_begin = chip->data_buffer; | |
307 | ||
308 | if (chip->buffer_begin == chip->buffer_end) | |
309 | chip->empty = 1; | |
310 | ||
311 | } | |
312 | ||
313 | if (!chip->empty) | |
314 | hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, | |
315 | HRTIMER_MODE_REL); | |
316 | ||
317 | return HRTIMER_NORESTART; | |
318 | } | |
319 | ||
320 | /* create -- chip-specific constructor for the cards components */ | |
e74033a8 BP |
321 | static int snd_sh_dac_create(struct snd_card *card, |
322 | struct platform_device *devptr, | |
323 | struct snd_sh_dac **rchip) | |
9dcaa7b2 RIZ |
324 | { |
325 | struct snd_sh_dac *chip; | |
326 | int err; | |
327 | ||
328 | static struct snd_device_ops ops = { | |
329 | .dev_free = snd_sh_dac_dev_free, | |
330 | }; | |
331 | ||
332 | *rchip = NULL; | |
333 | ||
334 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
335 | if (chip == NULL) | |
336 | return -ENOMEM; | |
337 | ||
338 | chip->card = card; | |
339 | ||
340 | hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
341 | chip->hrtimer.function = sh_dac_audio_timer; | |
342 | ||
343 | dac_audio_reset(chip); | |
344 | chip->rate = 8000; | |
345 | dac_audio_set_rate(chip); | |
346 | ||
347 | chip->pdata = devptr->dev.platform_data; | |
348 | ||
349 | chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL); | |
350 | if (chip->data_buffer == NULL) { | |
351 | kfree(chip); | |
352 | return -ENOMEM; | |
353 | } | |
354 | ||
355 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); | |
356 | if (err < 0) { | |
357 | snd_sh_dac_free(chip); | |
358 | return err; | |
359 | } | |
360 | ||
361 | *rchip = chip; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | /* driver .probe -- constructor */ | |
e74033a8 | 367 | static int snd_sh_dac_probe(struct platform_device *devptr) |
9dcaa7b2 RIZ |
368 | { |
369 | struct snd_sh_dac *chip; | |
370 | struct snd_card *card; | |
371 | int err; | |
372 | ||
e7182ac5 | 373 | err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card); |
9dcaa7b2 RIZ |
374 | if (err < 0) { |
375 | snd_printk(KERN_ERR "cannot allocate the card\n"); | |
376 | return err; | |
377 | } | |
378 | ||
379 | err = snd_sh_dac_create(card, devptr, &chip); | |
380 | if (err < 0) | |
381 | goto probe_error; | |
382 | ||
383 | err = snd_sh_dac_pcm(chip, 0); | |
384 | if (err < 0) | |
385 | goto probe_error; | |
386 | ||
387 | strcpy(card->driver, "snd_sh_dac"); | |
388 | strcpy(card->shortname, "SuperH DAC audio driver"); | |
389 | printk(KERN_INFO "%s %s", card->longname, card->shortname); | |
390 | ||
391 | err = snd_card_register(card); | |
392 | if (err < 0) | |
393 | goto probe_error; | |
394 | ||
c054c8a0 | 395 | snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio"); |
9dcaa7b2 RIZ |
396 | |
397 | platform_set_drvdata(devptr, card); | |
398 | return 0; | |
399 | ||
400 | probe_error: | |
401 | snd_card_free(card); | |
402 | return err; | |
403 | } | |
404 | ||
405 | /* | |
406 | * "driver" definition | |
407 | */ | |
d4c69838 | 408 | static struct platform_driver sh_dac_driver = { |
9dcaa7b2 RIZ |
409 | .probe = snd_sh_dac_probe, |
410 | .remove = snd_sh_dac_remove, | |
411 | .driver = { | |
412 | .name = "dac_audio", | |
413 | }, | |
414 | }; | |
415 | ||
d4c69838 | 416 | module_platform_driver(sh_dac_driver); |