[linux-block.git] / sound / sh / sh_dac_audio.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * sh_dac_audio.c - SuperH DAC audio driver for ALSA
 *
 * Copyright (c) 2009 by Rafael Ignacio Zurita <rizurita@yahoo.com>
 *
 * Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh)
 */

#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/sh_dac_audio.h>
#include <asm/clock.h>
#include <asm/hd64461.h>
#include <mach/hp6xx.h>
#include <cpu/dac.h>

MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
MODULE_DESCRIPTION("SuperH DAC audio driver");
MODULE_LICENSE("GPL");

/* Module Parameters */
static int index = SNDRV_DEFAULT_IDX1;
static char *id = SNDRV_DEFAULT_STR1;
module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");

/* main struct */
struct snd_sh_dac {
	struct snd_card *card;
	struct snd_pcm_substream *substream;
	struct hrtimer hrtimer;
	ktime_t wakeups_per_second;

	int rate;
	int empty;
	char *data_buffer, *buffer_begin, *buffer_end;
	int processed; /* bytes proccesed, to compare with period_size */
	int buffer_size;
	struct dac_audio_pdata *pdata;
};


static void dac_audio_start_timer(struct snd_sh_dac *chip)
{
	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
		      HRTIMER_MODE_REL);
}

static void dac_audio_stop_timer(struct snd_sh_dac *chip)
{
	hrtimer_cancel(&chip->hrtimer);
}

static void dac_audio_reset(struct snd_sh_dac *chip)
{
	dac_audio_stop_timer(chip);
	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
	chip->processed = 0;
	chip->empty = 1;
}

static void dac_audio_set_rate(struct snd_sh_dac *chip)
{
	chip->wakeups_per_second = 1000000000 / chip->rate;
}


/* PCM INTERFACE */

static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
	.info			= (SNDRV_PCM_INFO_MMAP |
					SNDRV_PCM_INFO_MMAP_VALID |
					SNDRV_PCM_INFO_INTERLEAVED |
					SNDRV_PCM_INFO_HALF_DUPLEX),
	.formats		= SNDRV_PCM_FMTBIT_U8,
	.rates			= SNDRV_PCM_RATE_8000,
	.rate_min		= 8000,
	.rate_max		= 8000,
	.channels_min		= 1,
	.channels_max		= 1,
	.buffer_bytes_max	= (48*1024),
	.period_bytes_min	= 1,
	.period_bytes_max	= (48*1024),
	.periods_min		= 1,
	.periods_max		= 1024,
};

static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	runtime->hw = snd_sh_dac_pcm_hw;

	chip->substream = substream;
	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
	chip->processed = 0;
	chip->empty = 1;

	chip->pdata->start(chip->pdata);

	return 0;
}

static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);

	chip->substream = NULL;

	dac_audio_stop_timer(chip);
	chip->pdata->stop(chip->pdata);

	return 0;
}

static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = chip->substream->runtime;

	chip->buffer_size = runtime->buffer_size;
	memset(chip->data_buffer, 0, chip->pdata->buffer_size);

	return 0;
}

static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		dac_audio_start_timer(chip);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		chip->buffer_begin = chip->buffer_end = chip->data_buffer;
		chip->processed = 0;
		chip->empty = 1;
		dac_audio_stop_timer(chip);
		break;
	default:
		 return -EINVAL;
	}

	return 0;
}

static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
			       int channel, unsigned long pos,
			       void __user *src, unsigned long count)
{
	/* channel is not used (interleaved data) */
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);

	if (copy_from_user_toio(chip->data_buffer + pos, src, count))
		return -EFAULT;
	chip->buffer_end = chip->data_buffer + pos + count;

	if (chip->empty) {
		chip->empty = 0;
		dac_audio_start_timer(chip);
	}

	return 0;
}

static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
				      int channel, unsigned long pos,
				      void *src, unsigned long count)
{
	/* channel is not used (interleaved data) */
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);

	memcpy_toio(chip->data_buffer + pos, src, count);
	chip->buffer_end = chip->data_buffer + pos + count;

	if (chip->empty) {
		chip->empty = 0;
		dac_audio_start_timer(chip);
	}

	return 0;
}

static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
				  int channel, unsigned long pos,
				  unsigned long count)
{
	/* channel is not used (interleaved data) */
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);

	memset_io(chip->data_buffer + pos, 0, count);
	chip->buffer_end = chip->data_buffer + pos + count;

	if (chip->empty) {
		chip->empty = 0;
		dac_audio_start_timer(chip);
	}

	return 0;
}

static
snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	int pointer = chip->buffer_begin - chip->data_buffer;

	return pointer;
}

/* pcm ops */
static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
	.open		= snd_sh_dac_pcm_open,
	.close		= snd_sh_dac_pcm_close,
	.prepare	= snd_sh_dac_pcm_prepare,
	.trigger	= snd_sh_dac_pcm_trigger,
	.pointer	= snd_sh_dac_pcm_pointer,
	.copy_user	= snd_sh_dac_pcm_copy,
	.copy_kernel	= snd_sh_dac_pcm_copy_kernel,
	.fill_silence	= snd_sh_dac_pcm_silence,
	.mmap		= snd_pcm_lib_mmap_iomem,
};

static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
{
	int err;
	struct snd_pcm *pcm;

	/* device should be always 0 for us */
	err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
	if (err < 0)
		return err;

	pcm->private_data = chip;
	strcpy(pcm->name, "SH_DAC PCM");
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);

	/* buffer size=48K */
	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
				       NULL, 48 * 1024, 48 * 1024);

	return 0;
}
/* END OF PCM INTERFACE */


/* driver .remove  --  destructor */
static void snd_sh_dac_remove(struct platform_device *devptr)
{
	snd_card_free(platform_get_drvdata(devptr));
}

/* free -- it has been defined by create */
static int snd_sh_dac_free(struct snd_sh_dac *chip)
{
	/* release the data */
	kfree(chip->data_buffer);
	kfree(chip);

	return 0;
}

static int snd_sh_dac_dev_free(struct snd_device *device)
{
	struct snd_sh_dac *chip = device->device_data;

	return snd_sh_dac_free(chip);
}

static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
{
	struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
					       hrtimer);
	struct snd_pcm_runtime *runtime = chip->substream->runtime;
	ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);

	if (!chip->empty) {
		sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
		chip->buffer_begin++;

		chip->processed++;
		if (chip->processed >= b_ps) {
			chip->processed -= b_ps;
			snd_pcm_period_elapsed(chip->substream);
		}

		if (chip->buffer_begin == (chip->data_buffer +
					   chip->buffer_size - 1))
			chip->buffer_begin = chip->data_buffer;

		if (chip->buffer_begin == chip->buffer_end)
			chip->empty = 1;

	}

	if (!chip->empty)
		hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
			      HRTIMER_MODE_REL);

	return HRTIMER_NORESTART;
}

/* create  --  chip-specific constructor for the cards components */
static int snd_sh_dac_create(struct snd_card *card,
			     struct platform_device *devptr,
			     struct snd_sh_dac **rchip)
{
	struct snd_sh_dac *chip;
	int err;

	static const struct snd_device_ops ops = {
		   .dev_free = snd_sh_dac_dev_free,
	};

	*rchip = NULL;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	chip->card = card;

	hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	chip->hrtimer.function = sh_dac_audio_timer;

	dac_audio_reset(chip);
	chip->rate = 8000;
	dac_audio_set_rate(chip);

	chip->pdata = devptr->dev.platform_data;

	chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
	if (chip->data_buffer == NULL) {
		kfree(chip);
		return -ENOMEM;
	}

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
		snd_sh_dac_free(chip);
		return err;
	}

	*rchip = chip;

	return 0;
}

/* driver .probe  --  constructor */
static int snd_sh_dac_probe(struct platform_device *devptr)
{
	struct snd_sh_dac *chip;
	struct snd_card *card;
	int err;

	err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
	if (err < 0) {
			snd_printk(KERN_ERR "cannot allocate the card\n");
			return err;
	}

	err = snd_sh_dac_create(card, devptr, &chip);
	if (err < 0)
		goto probe_error;

	err = snd_sh_dac_pcm(chip, 0);
	if (err < 0)
		goto probe_error;

	strcpy(card->driver, "snd_sh_dac");
	strcpy(card->shortname, "SuperH DAC audio driver");
	printk(KERN_INFO "%s %s", card->longname, card->shortname);

	err = snd_card_register(card);
	if (err < 0)
		goto probe_error;

	snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");

	platform_set_drvdata(devptr, card);
	return 0;

probe_error:
	snd_card_free(card);
	return err;
}

/*
 * "driver" definition
 */
static struct platform_driver sh_dac_driver = {
	.probe	= snd_sh_dac_probe,
	.remove_new = snd_sh_dac_remove,
	.driver = {
		.name = "dac_audio",
	},
};

module_platform_driver(sh_dac_driver);
Commit	Line	Data
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");
9dcaa7b2 RIZ	28
	29	/* Module Parameters */
	30	static int index = SNDRV_DEFAULT_IDX1;
	31	static char *id = SNDRV_DEFAULT_STR1;
	32	module_param(index, int, 0444);
	33	MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
	34	module_param(id, charp, 0444);
	35	MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
	36
	37	/* main struct */
	38	struct 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
	53	static 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
	59	static void dac_audio_stop_timer(struct snd_sh_dac *chip)
	60	{
	61	hrtimer_cancel(&chip->hrtimer);
	62	}
	63
	64	static 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
	72	static void dac_audio_set_rate(struct snd_sh_dac *chip)
	73	{
8b0e1953	74	chip->wakeups_per_second = 1000000000 / chip->rate;
9dcaa7b2 RIZ	75	}
	76
	77
	78	/* PCM INTERFACE */
	79
cd196fe2	80	static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
9dcaa7b2 RIZ	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
	98	static 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
	115	static 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
9dcaa7b2 RIZ	127	static 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
	138	static 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
1cc2f8ba TI	159	static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
	160	int channel, unsigned long pos,
	161	void __user *src, unsigned long count)
9dcaa7b2 RIZ	162	{
	163	/* channel is not used (interleaved data) */
	164	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
9dcaa7b2	165
1cc2f8ba TI	166	if (copy_from_user_toio(chip->data_buffer + pos, src, count))
	167	return -EFAULT;
	168	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2	169
1cc2f8ba TI	170	if (chip->empty) {
	171	chip->empty = 0;
	172	dac_audio_start_timer(chip);
	173	}
	174
	175	return 0;
	176	}
9dcaa7b2	177
1cc2f8ba TI	178	static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
	179	int channel, unsigned long pos,
	180	void *src, unsigned long count)
	181	{
	182	/* channel is not used (interleaved data) */
	183	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
1cc2f8ba TI	184
	185	memcpy_toio(chip->data_buffer + pos, src, count);
	186	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2 RIZ	187
	188	if (chip->empty) {
	189	chip->empty = 0;
	190	dac_audio_start_timer(chip);
	191	}
	192
	193	return 0;
	194	}
	195
	196	static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
1cc2f8ba TI	197	int channel, unsigned long pos,
1cc2f8ba TI	198	unsigned long count)
9dcaa7b2 RIZ	199	{
	200	/* channel is not used (interleaved data) */
	201	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
9dcaa7b2	202
1cc2f8ba TI	203	memset_io(chip->data_buffer + pos, 0, count);
1cc2f8ba TI	204	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2 RIZ	205
	206	if (chip->empty) {
	207	chip->empty = 0;
	208	dac_audio_start_timer(chip);
	209	}
	210
	211	return 0;
	212	}
	213
	214	static
	215	snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
	216	{
	217	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	218	int pointer = chip->buffer_begin - chip->data_buffer;
	219
	220	return pointer;
	221	}
	222
	223	/* pcm ops */
46a085a3	224	static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
9dcaa7b2 RIZ	225	.open = snd_sh_dac_pcm_open,
9dcaa7b2 RIZ	226	.close = snd_sh_dac_pcm_close,
9dcaa7b2 RIZ	227	.prepare = snd_sh_dac_pcm_prepare,
	228	.trigger = snd_sh_dac_pcm_trigger,
	229	.pointer = snd_sh_dac_pcm_pointer,
1cc2f8ba TI	230	.copy_user = snd_sh_dac_pcm_copy,
	231	.copy_kernel = snd_sh_dac_pcm_copy_kernel,
	232	.fill_silence = snd_sh_dac_pcm_silence,
9dcaa7b2 RIZ	233	.mmap = snd_pcm_lib_mmap_iomem,
	234	};
	235
e74033a8	236	static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
9dcaa7b2 RIZ	237	{
	238	int err;
	239	struct snd_pcm *pcm;
	240
	241	/* device should be always 0 for us */
	242	err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
	243	if (err < 0)
	244	return err;
	245
	246	pcm->private_data = chip;
	247	strcpy(pcm->name, "SH_DAC PCM");
	248	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
	249
	250	/* buffer size=48K */
50cdf3a0 TI	251	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
50cdf3a0 TI	252	NULL, 48 * 1024, 48 * 1024);
9dcaa7b2 RIZ	253
	254	return 0;
	255	}
	256	/* END OF PCM INTERFACE */
	257
	258
	259	/* driver .remove -- destructor */
a0f4aa0a	260	static void snd_sh_dac_remove(struct platform_device *devptr)
9dcaa7b2 RIZ	261	{
9dcaa7b2 RIZ	262	snd_card_free(platform_get_drvdata(devptr));
9dcaa7b2 RIZ	263	}
	264
	265	/* free -- it has been defined by create */
	266	static int snd_sh_dac_free(struct snd_sh_dac *chip)
	267	{
	268	/* release the data */
	269	kfree(chip->data_buffer);
	270	kfree(chip);
	271
	272	return 0;
	273	}
	274
	275	static int snd_sh_dac_dev_free(struct snd_device *device)
	276	{
	277	struct snd_sh_dac *chip = device->device_data;
	278
	279	return snd_sh_dac_free(chip);
	280	}
	281
	282	static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
	283	{
	284	struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
	285	hrtimer);
	286	struct snd_pcm_runtime *runtime = chip->substream->runtime;
	287	ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
	288
	289	if (!chip->empty) {
	290	sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
	291	chip->buffer_begin++;
	292
	293	chip->processed++;
	294	if (chip->processed >= b_ps) {
	295	chip->processed -= b_ps;
	296	snd_pcm_period_elapsed(chip->substream);
	297	}
	298
	299	if (chip->buffer_begin == (chip->data_buffer +
	300	chip->buffer_size - 1))
	301	chip->buffer_begin = chip->data_buffer;
	302
	303	if (chip->buffer_begin == chip->buffer_end)
	304	chip->empty = 1;
	305
	306	}
	307
	308	if (!chip->empty)
	309	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
	310	HRTIMER_MODE_REL);
	311
	312	return HRTIMER_NORESTART;
	313	}
	314
	315	/* create -- chip-specific constructor for the cards components */
e74033a8 BP	316	static int snd_sh_dac_create(struct snd_card *card,
	317	struct platform_device *devptr,
	318	struct snd_sh_dac **rchip)
9dcaa7b2 RIZ	319	{
	320	struct snd_sh_dac *chip;
	321	int err;
	322
52b136d2	323	static const struct snd_device_ops ops = {
9dcaa7b2 RIZ	324	.dev_free = snd_sh_dac_dev_free,
	325	};
	326
	327	*rchip = NULL;
	328
	329	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	330	if (chip == NULL)
	331	return -ENOMEM;
	332
	333	chip->card = card;
	334
	335	hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	336	chip->hrtimer.function = sh_dac_audio_timer;
	337
	338	dac_audio_reset(chip);
	339	chip->rate = 8000;
	340	dac_audio_set_rate(chip);
	341
	342	chip->pdata = devptr->dev.platform_data;
	343
	344	chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
	345	if (chip->data_buffer == NULL) {
	346	kfree(chip);
	347	return -ENOMEM;
	348	}
	349
	350	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	351	if (err < 0) {
	352	snd_sh_dac_free(chip);
	353	return err;
	354	}
	355
	356	*rchip = chip;
	357
	358	return 0;
	359	}
	360
	361	/* driver .probe -- constructor */
e74033a8	362	static int snd_sh_dac_probe(struct platform_device *devptr)
9dcaa7b2 RIZ	363	{
	364	struct snd_sh_dac *chip;
	365	struct snd_card *card;
	366	int err;
	367
e7182ac5	368	err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
9dcaa7b2 RIZ	369	if (err < 0) {
	370	snd_printk(KERN_ERR "cannot allocate the card\n");
	371	return err;
	372	}
	373
	374	err = snd_sh_dac_create(card, devptr, &chip);
	375	if (err < 0)
	376	goto probe_error;
	377
	378	err = snd_sh_dac_pcm(chip, 0);
	379	if (err < 0)
	380	goto probe_error;
	381
	382	strcpy(card->driver, "snd_sh_dac");
	383	strcpy(card->shortname, "SuperH DAC audio driver");
	384	printk(KERN_INFO "%s %s", card->longname, card->shortname);
	385
	386	err = snd_card_register(card);
	387	if (err < 0)
	388	goto probe_error;
	389
c054c8a0	390	snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
9dcaa7b2 RIZ	391
	392	platform_set_drvdata(devptr, card);
	393	return 0;
	394
	395	probe_error:
	396	snd_card_free(card);
	397	return err;
	398	}
	399
	400	/*
	401	* "driver" definition
	402	*/
d4c69838	403	static struct platform_driver sh_dac_driver = {
9dcaa7b2	404	.probe = snd_sh_dac_probe,
a0f4aa0a	405	.remove_new = snd_sh_dac_remove,
9dcaa7b2 RIZ	406	.driver = {
	407	.name = "dac_audio",
	408	},
	409	};
	410
d4c69838	411	module_platform_driver(sh_dac_driver);