[mirror_ubuntu-jammy-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_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream,
			params_buffer_bytes(hw_params));
}

static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

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);
	struct snd_pcm_runtime *runtime = substream->runtime;

	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);
	struct snd_pcm_runtime *runtime = substream->runtime;

	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);
	struct snd_pcm_runtime *runtime = substream->runtime;

	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,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= snd_sh_dac_pcm_hw_params,
	.hw_free	= snd_sh_dac_pcm_hw_free,
	.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_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
					  snd_dma_continuous_data(GFP_KERNEL),
							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 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
	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
1cc2f8ba TI	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)
9dcaa7b2 RIZ	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;
9dcaa7b2	179
1cc2f8ba TI	180	if (copy_from_user_toio(chip->data_buffer + pos, src, count))
	181	return -EFAULT;
	182	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2	183
1cc2f8ba TI	184	if (chip->empty) {
	185	chip->empty = 0;
	186	dac_audio_start_timer(chip);
	187	}
	188
	189	return 0;
	190	}
9dcaa7b2	191
1cc2f8ba TI	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;
9dcaa7b2 RIZ	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,
1cc2f8ba TI	212	int channel, unsigned long pos,
1cc2f8ba TI	213	unsigned long count)
9dcaa7b2 RIZ	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;
9dcaa7b2	218
1cc2f8ba TI	219	memset_io(chip->data_buffer + pos, 0, count);
1cc2f8ba TI	220	chip->buffer_end = chip->data_buffer + pos + count;
9dcaa7b2 RIZ	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 */
46a085a3	240	static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
9dcaa7b2 RIZ	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,
1cc2f8ba TI	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,
9dcaa7b2 RIZ	252	.mmap = snd_pcm_lib_mmap_iomem,
	253	};
	254
e74033a8	255	static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
9dcaa7b2 RIZ	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));
9dcaa7b2 RIZ	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 */
e74033a8 BP	338	static int snd_sh_dac_create(struct snd_card *card,
	339	struct platform_device *devptr,
	340	struct snd_sh_dac **rchip)
9dcaa7b2 RIZ	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 */
e74033a8	384	static int snd_sh_dac_probe(struct platform_device *devptr)
9dcaa7b2 RIZ	385	{
	386	struct snd_sh_dac *chip;
	387	struct snd_card *card;
	388	int err;
	389
e7182ac5	390	err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
9dcaa7b2 RIZ	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
c054c8a0	412	snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
9dcaa7b2 RIZ	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	*/
d4c69838	425	static struct platform_driver sh_dac_driver = {
9dcaa7b2 RIZ	426	.probe = snd_sh_dac_probe,
	427	.remove = snd_sh_dac_remove,
	428	.driver = {
	429	.name = "dac_audio",
	430	},
	431	};
	432
d4c69838	433	module_platform_driver(sh_dac_driver);