[mirror_ubuntu-hirsute-kernel.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_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");

/* 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 int snd_sh_dac_remove(struct platform_device *devptr)
{
	snd_card_free(platform_get_drvdata(devptr));
	return 0;
}

/* 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 = 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");
	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);
9dcaa7b2	166
1cc2f8ba TI	167	if (copy_from_user_toio(chip->data_buffer + pos, src, count))
	168	return -EFAULT;
	169	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2	170
1cc2f8ba TI	171	if (chip->empty) {
	172	chip->empty = 0;
	173	dac_audio_start_timer(chip);
	174	}
	175
	176	return 0;
	177	}
9dcaa7b2	178
1cc2f8ba TI	179	static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
	180	int channel, unsigned long pos,
	181	void *src, unsigned long count)
	182	{
	183	/* channel is not used (interleaved data) */
	184	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
1cc2f8ba TI	185
	186	memcpy_toio(chip->data_buffer + pos, src, count);
	187	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2 RIZ	188
	189	if (chip->empty) {
	190	chip->empty = 0;
	191	dac_audio_start_timer(chip);
	192	}
	193
	194	return 0;
	195	}
	196
	197	static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
1cc2f8ba TI	198	int channel, unsigned long pos,
1cc2f8ba TI	199	unsigned long count)
9dcaa7b2 RIZ	200	{
	201	/* channel is not used (interleaved data) */
	202	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
9dcaa7b2	203
1cc2f8ba TI	204	memset_io(chip->data_buffer + pos, 0, count);
1cc2f8ba TI	205	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2 RIZ	206
	207	if (chip->empty) {
	208	chip->empty = 0;
	209	dac_audio_start_timer(chip);
	210	}
	211
	212	return 0;
	213	}
	214
	215	static
	216	snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
	217	{
	218	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	219	int pointer = chip->buffer_begin - chip->data_buffer;
	220
	221	return pointer;
	222	}
	223
	224	/* pcm ops */
46a085a3	225	static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
9dcaa7b2 RIZ	226	.open = snd_sh_dac_pcm_open,
9dcaa7b2 RIZ	227	.close = snd_sh_dac_pcm_close,
9dcaa7b2 RIZ	228	.prepare = snd_sh_dac_pcm_prepare,
	229	.trigger = snd_sh_dac_pcm_trigger,
	230	.pointer = snd_sh_dac_pcm_pointer,
1cc2f8ba TI	231	.copy_user = snd_sh_dac_pcm_copy,
	232	.copy_kernel = snd_sh_dac_pcm_copy_kernel,
	233	.fill_silence = snd_sh_dac_pcm_silence,
9dcaa7b2 RIZ	234	.mmap = snd_pcm_lib_mmap_iomem,
	235	};
	236
e74033a8	237	static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
9dcaa7b2 RIZ	238	{
	239	int err;
	240	struct snd_pcm *pcm;
	241
	242	/* device should be always 0 for us */
	243	err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
	244	if (err < 0)
	245	return err;
	246
	247	pcm->private_data = chip;
	248	strcpy(pcm->name, "SH_DAC PCM");
	249	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
	250
	251	/* buffer size=48K */
50cdf3a0 TI	252	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
50cdf3a0 TI	253	NULL, 48 * 1024, 48 * 1024);
9dcaa7b2 RIZ	254
	255	return 0;
	256	}
	257	/* END OF PCM INTERFACE */
	258
	259
	260	/* driver .remove -- destructor */
	261	static int snd_sh_dac_remove(struct platform_device *devptr)
	262	{
	263	snd_card_free(platform_get_drvdata(devptr));
9dcaa7b2 RIZ	264	return 0;
	265	}
	266
	267	/* free -- it has been defined by create */
	268	static int snd_sh_dac_free(struct snd_sh_dac *chip)
	269	{
	270	/* release the data */
	271	kfree(chip->data_buffer);
	272	kfree(chip);
	273
	274	return 0;
	275	}
	276
	277	static int snd_sh_dac_dev_free(struct snd_device *device)
	278	{
	279	struct snd_sh_dac *chip = device->device_data;
	280
	281	return snd_sh_dac_free(chip);
	282	}
	283
	284	static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
	285	{
	286	struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
	287	hrtimer);
	288	struct snd_pcm_runtime *runtime = chip->substream->runtime;
	289	ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
	290
	291	if (!chip->empty) {
	292	sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
	293	chip->buffer_begin++;
	294
	295	chip->processed++;
	296	if (chip->processed >= b_ps) {
	297	chip->processed -= b_ps;
	298	snd_pcm_period_elapsed(chip->substream);
	299	}
	300
	301	if (chip->buffer_begin == (chip->data_buffer +
	302	chip->buffer_size - 1))
	303	chip->buffer_begin = chip->data_buffer;
	304
	305	if (chip->buffer_begin == chip->buffer_end)
	306	chip->empty = 1;
	307
	308	}
	309
	310	if (!chip->empty)
	311	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
	312	HRTIMER_MODE_REL);
	313
	314	return HRTIMER_NORESTART;
	315	}
	316
	317	/* create -- chip-specific constructor for the cards components */
e74033a8 BP	318	static int snd_sh_dac_create(struct snd_card *card,
	319	struct platform_device *devptr,
	320	struct snd_sh_dac **rchip)
9dcaa7b2 RIZ	321	{
	322	struct snd_sh_dac *chip;
	323	int err;
	324
52b136d2	325	static const struct snd_device_ops ops = {
9dcaa7b2 RIZ	326	.dev_free = snd_sh_dac_dev_free,
	327	};
	328
	329	*rchip = NULL;
	330
	331	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	332	if (chip == NULL)
	333	return -ENOMEM;
	334
	335	chip->card = card;
	336
	337	hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	338	chip->hrtimer.function = sh_dac_audio_timer;
	339
	340	dac_audio_reset(chip);
	341	chip->rate = 8000;
	342	dac_audio_set_rate(chip);
	343
	344	chip->pdata = devptr->dev.platform_data;
	345
	346	chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
	347	if (chip->data_buffer == NULL) {
	348	kfree(chip);
	349	return -ENOMEM;
	350	}
	351
	352	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	353	if (err < 0) {
	354	snd_sh_dac_free(chip);
	355	return err;
	356	}
	357
	358	*rchip = chip;
	359
	360	return 0;
	361	}
	362
	363	/* driver .probe -- constructor */
e74033a8	364	static int snd_sh_dac_probe(struct platform_device *devptr)
9dcaa7b2 RIZ	365	{
	366	struct snd_sh_dac *chip;
	367	struct snd_card *card;
	368	int err;
	369
e7182ac5	370	err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
9dcaa7b2 RIZ	371	if (err < 0) {
	372	snd_printk(KERN_ERR "cannot allocate the card\n");
	373	return err;
	374	}
	375
	376	err = snd_sh_dac_create(card, devptr, &chip);
	377	if (err < 0)
	378	goto probe_error;
	379
	380	err = snd_sh_dac_pcm(chip, 0);
	381	if (err < 0)
	382	goto probe_error;
	383
	384	strcpy(card->driver, "snd_sh_dac");
	385	strcpy(card->shortname, "SuperH DAC audio driver");
	386	printk(KERN_INFO "%s %s", card->longname, card->shortname);
	387
	388	err = snd_card_register(card);
	389	if (err < 0)
	390	goto probe_error;
	391
c054c8a0	392	snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
9dcaa7b2 RIZ	393
	394	platform_set_drvdata(devptr, card);
	395	return 0;
	396
	397	probe_error:
	398	snd_card_free(card);
	399	return err;
	400	}
	401
	402	/*
	403	* "driver" definition
	404	*/
d4c69838	405	static struct platform_driver sh_dac_driver = {
9dcaa7b2 RIZ	406	.probe = snd_sh_dac_probe,
	407	.remove = snd_sh_dac_remove,
	408	.driver = {
	409	.name = "dac_audio",
	410	},
	411	};
	412
d4c69838	413	module_platform_driver(sh_dac_driver);