[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / sh / sh_dac_audio.c

/*
 * 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)
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.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 = ktime_set(0, 1000000000 / chip->rate);
}


/* PCM INTERFACE */

static 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,
	snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count)
{
	/* channel is not used (interleaved data) */
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	ssize_t b_count = frames_to_bytes(runtime , count);
	ssize_t b_pos = frames_to_bytes(runtime , pos);

	if (count < 0)
		return -EINVAL;

	if (!count)
		return 0;

	memcpy_toio(chip->data_buffer + b_pos, src, b_count);
	chip->buffer_end = chip->data_buffer + b_pos + b_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, snd_pcm_uframes_t pos,
				  snd_pcm_uframes_t count)
{
	/* channel is not used (interleaved data) */
	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	ssize_t b_count = frames_to_bytes(runtime , count);
	ssize_t b_pos = frames_to_bytes(runtime , pos);

	if (count < 0)
		return -EINVAL;

	if (!count)
		return 0;

	memset_io(chip->data_buffer + b_pos, 0, b_count);
	chip->buffer_end = chip->data_buffer + b_pos + b_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 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		= snd_sh_dac_pcm_copy,
	.silence	= snd_sh_dac_pcm_silence,
	.mmap		= snd_pcm_lib_mmap_iomem,
};

static int __devinit 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));
	platform_set_drvdata(devptr, NULL);

	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 __devinit 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 __devinit snd_sh_dac_probe(struct platform_device *devptr)
{
	struct snd_sh_dac *chip;
	struct snd_card *card;
	int err;

	err = snd_card_create(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("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 driver = {
	.probe	= snd_sh_dac_probe,
	.remove = snd_sh_dac_remove,
	.driver = {
		.name = "dac_audio",
	},
};

static int __init sh_dac_init(void)
{
	return platform_driver_register(&driver);
}

static void __exit sh_dac_exit(void)
{
	platform_driver_unregister(&driver);
}

module_init(sh_dac_init);
module_exit(sh_dac_exit);
Commit	Line	Data
9dcaa7b2 RIZ	1	/*
	2	* sh_dac_audio.c - SuperH DAC audio driver for ALSA
	3	*
	4	* Copyright (c) 2009 by Rafael Ignacio Zurita <rizurita@yahoo.com>
	5	*
	6	*
	7	* Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh)
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*
	23	*/
	24
	25	#include <linux/hrtimer.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/io.h>
	28	#include <linux/platform_device.h>
5a0e3ad6	29	#include <linux/slab.h>
9dcaa7b2 RIZ	30	#include <sound/core.h>
	31	#include <sound/initval.h>
	32	#include <sound/pcm.h>
	33	#include <sound/sh_dac_audio.h>
	34	#include <asm/clock.h>
	35	#include <asm/hd64461.h>
	36	#include <mach/hp6xx.h>
	37	#include <cpu/dac.h>
	38
	39	MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
	40	MODULE_DESCRIPTION("SuperH DAC audio driver");
	41	MODULE_LICENSE("GPL");
	42	MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
	43
	44	/* Module Parameters */
	45	static int index = SNDRV_DEFAULT_IDX1;
	46	static char *id = SNDRV_DEFAULT_STR1;
	47	module_param(index, int, 0444);
	48	MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
	49	module_param(id, charp, 0444);
	50	MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
	51
	52	/* main struct */
	53	struct snd_sh_dac {
	54	struct snd_card *card;
	55	struct snd_pcm_substream *substream;
	56	struct hrtimer hrtimer;
	57	ktime_t wakeups_per_second;
	58
	59	int rate;
	60	int empty;
	61	char data_buffer, buffer_begin, *buffer_end;
	62	int processed; /* bytes proccesed, to compare with period_size */
	63	int buffer_size;
	64	struct dac_audio_pdata *pdata;
	65	};
	66
	67
	68	static void dac_audio_start_timer(struct snd_sh_dac *chip)
	69	{
	70	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
	71	HRTIMER_MODE_REL);
	72	}
	73
	74	static void dac_audio_stop_timer(struct snd_sh_dac *chip)
	75	{
	76	hrtimer_cancel(&chip->hrtimer);
	77	}
	78
	79	static void dac_audio_reset(struct snd_sh_dac *chip)
	80	{
	81	dac_audio_stop_timer(chip);
	82	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
	83	chip->processed = 0;
	84	chip->empty = 1;
	85	}
	86
	87	static void dac_audio_set_rate(struct snd_sh_dac *chip)
	88	{
	89	chip->wakeups_per_second = ktime_set(0, 1000000000 / chip->rate);
	90	}
	91
	92
	93	/* PCM INTERFACE */
94
95	static struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
96	.info = (SNDRV_PCM_INFO_MMAP \|
97	SNDRV_PCM_INFO_MMAP_VALID \|
98	SNDRV_PCM_INFO_INTERLEAVED \|
99	SNDRV_PCM_INFO_HALF_DUPLEX),
100	.formats = SNDRV_PCM_FMTBIT_U8,
101	.rates = SNDRV_PCM_RATE_8000,
102	.rate_min = 8000,
103	.rate_max = 8000,
104	.channels_min = 1,
105	.channels_max = 1,
106	.buffer_bytes_max = (48*1024),
107	.period_bytes_min = 1,
108	.period_bytes_max = (48*1024),
109	.periods_min = 1,
110	.periods_max = 1024,
111	};
112
113	static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
114	{
115	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
116	struct snd_pcm_runtime *runtime = substream->runtime;
117
118	runtime->hw = snd_sh_dac_pcm_hw;
119
120	chip->substream = substream;
121	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
122	chip->processed = 0;
123	chip->empty = 1;
124
125	chip->pdata->start(chip->pdata);
126
127	return 0;
128	}
129
130	static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
131	{
132	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
133
134	chip->substream = NULL;
135
136	dac_audio_stop_timer(chip);
137	chip->pdata->stop(chip->pdata);
138
139	return 0;
140	}
141
142	static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream,
143	struct snd_pcm_hw_params *hw_params)
144	{
145	return snd_pcm_lib_malloc_pages(substream,
146	params_buffer_bytes(hw_params));
147	}
148
149	static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
150	{
151	return snd_pcm_lib_free_pages(substream);
152	}
153
154	static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
155	{
156	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
157	struct snd_pcm_runtime *runtime = chip->substream->runtime;
158
159	chip->buffer_size = runtime->buffer_size;
160	memset(chip->data_buffer, 0, chip->pdata->buffer_size);
161
162	return 0;
163	}
164
165	static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
166	{
167	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
168
169	switch (cmd) {
170	case SNDRV_PCM_TRIGGER_START:
171	dac_audio_start_timer(chip);
172	break;
173	case SNDRV_PCM_TRIGGER_STOP:
174	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
175	chip->processed = 0;
176	chip->empty = 1;
177	dac_audio_stop_timer(chip);
178	break;
179	default:
180	return -EINVAL;
181	}
182
183	return 0;
184	}
185
186	static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, int channel,
187	snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count)
188	{
189	/* channel is not used (interleaved data) */
190	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
191	struct snd_pcm_runtime *runtime = substream->runtime;
192	ssize_t b_count = frames_to_bytes(runtime , count);
193	ssize_t b_pos = frames_to_bytes(runtime , pos);
194
195	if (count < 0)
196	return -EINVAL;
197
198	if (!count)
199	return 0;
200
201	memcpy_toio(chip->data_buffer + b_pos, src, b_count);
202	chip->buffer_end = chip->data_buffer + b_pos + b_count;
203
204	if (chip->empty) {
205	chip->empty = 0;
206	dac_audio_start_timer(chip);
207	}
208
209	return 0;
210	}
211
212	static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
213	int channel, snd_pcm_uframes_t pos,
214	snd_pcm_uframes_t count)
215	{
216	/* channel is not used (interleaved data) */
217	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
218	struct snd_pcm_runtime *runtime = substream->runtime;
219	ssize_t b_count = frames_to_bytes(runtime , count);
220	ssize_t b_pos = frames_to_bytes(runtime , pos);
221
222	if (count < 0)
223	return -EINVAL;
224
225	if (!count)
226	return 0;
227
228	memset_io(chip->data_buffer + b_pos, 0, b_count);
229	chip->buffer_end = chip->data_buffer + b_pos + b_count;
230
231	if (chip->empty) {
232	chip->empty = 0;
233	dac_audio_start_timer(chip);
234	}
235
236	return 0;
237	}
238
239	static
240	snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
241	{
242	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
243	int pointer = chip->buffer_begin - chip->data_buffer;
244
245	return pointer;
246	}
247
248	/* pcm ops */
249	static struct snd_pcm_ops snd_sh_dac_pcm_ops = {
250	.open = snd_sh_dac_pcm_open,
251	.close = snd_sh_dac_pcm_close,
252	.ioctl = snd_pcm_lib_ioctl,
253	.hw_params = snd_sh_dac_pcm_hw_params,
254	.hw_free = snd_sh_dac_pcm_hw_free,
255	.prepare = snd_sh_dac_pcm_prepare,
256	.trigger = snd_sh_dac_pcm_trigger,
257	.pointer = snd_sh_dac_pcm_pointer,
258	.copy = snd_sh_dac_pcm_copy,
259	.silence = snd_sh_dac_pcm_silence,
260	.mmap = snd_pcm_lib_mmap_iomem,
261	};
262
263	static int __devinit snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
264	{
265	int err;
266	struct snd_pcm *pcm;
267
268	/* device should be always 0 for us */
269	err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
270	if (err < 0)
271	return err;
272
273	pcm->private_data = chip;
274	strcpy(pcm->name, "SH_DAC PCM");
275	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
276
277	/* buffer size=48K */
278	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
279	snd_dma_continuous_data(GFP_KERNEL),
280	48 * 1024,
281	48 * 1024);
282
283	return 0;
284	}
285	/* END OF PCM INTERFACE */
286
287
288	/* driver .remove -- destructor */
289	static int snd_sh_dac_remove(struct platform_device *devptr)
290	{
291	snd_card_free(platform_get_drvdata(devptr));
292	platform_set_drvdata(devptr, NULL);
293
294	return 0;
295	}
296
297	/* free -- it has been defined by create */
298	static int snd_sh_dac_free(struct snd_sh_dac *chip)
299	{
300	/* release the data */
301	kfree(chip->data_buffer);
302	kfree(chip);
303
304	return 0;
305	}
306
307	static int snd_sh_dac_dev_free(struct snd_device *device)
308	{
309	struct snd_sh_dac *chip = device->device_data;
310
311	return snd_sh_dac_free(chip);
312	}
313
314	static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
315	{
316	struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
317	hrtimer);
318	struct snd_pcm_runtime *runtime = chip->substream->runtime;
319	ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
320
321	if (!chip->empty) {
322	sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
323	chip->buffer_begin++;
324
325	chip->processed++;
326	if (chip->processed >= b_ps) {
327	chip->processed -= b_ps;
328	snd_pcm_period_elapsed(chip->substream);
329	}
330
331	if (chip->buffer_begin == (chip->data_buffer +
332	chip->buffer_size - 1))
333	chip->buffer_begin = chip->data_buffer;
334
335	if (chip->buffer_begin == chip->buffer_end)
336	chip->empty = 1;
337
338	}
339
340	if (!chip->empty)
341	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
342	HRTIMER_MODE_REL);
343
344	return HRTIMER_NORESTART;
345	}
346
347	/* create -- chip-specific constructor for the cards components */
348	static int __devinit snd_sh_dac_create(struct snd_card *card,
349	struct platform_device *devptr,
350	struct snd_sh_dac **rchip)
351	{
352	struct snd_sh_dac *chip;
353	int err;
354
355	static struct snd_device_ops ops = {
356	.dev_free = snd_sh_dac_dev_free,
357	};
358
359	*rchip = NULL;
360
361	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
362	if (chip == NULL)
363	return -ENOMEM;
364
365	chip->card = card;
366
367	hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
368	chip->hrtimer.function = sh_dac_audio_timer;
369
370	dac_audio_reset(chip);
371	chip->rate = 8000;
372	dac_audio_set_rate(chip);
373
374	chip->pdata = devptr->dev.platform_data;
375
376	chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
377	if (chip->data_buffer == NULL) {
378	kfree(chip);
379	return -ENOMEM;
380	}
381
382	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
383	if (err < 0) {
384	snd_sh_dac_free(chip);
385	return err;
386	}
387
388	*rchip = chip;
389
390	return 0;
391	}
392
393	/* driver .probe -- constructor */
394	static int __devinit snd_sh_dac_probe(struct platform_device *devptr)
395	{
396	struct snd_sh_dac *chip;
397	struct snd_card *card;
398	int err;
399
400	err = snd_card_create(index, id, THIS_MODULE, 0, &card);
401	if (err < 0) {
402	snd_printk(KERN_ERR "cannot allocate the card\n");
403	return err;
404	}
405
406	err = snd_sh_dac_create(card, devptr, &chip);
407	if (err < 0)
408	goto probe_error;
409
410	err = snd_sh_dac_pcm(chip, 0);
411	if (err < 0)
412	goto probe_error;
413
414	strcpy(card->driver, "snd_sh_dac");
415	strcpy(card->shortname, "SuperH DAC audio driver");
416	printk(KERN_INFO "%s %s", card->longname, card->shortname);
417
418	err = snd_card_register(card);
419	if (err < 0)
420	goto probe_error;
421
422	snd_printk("ALSA driver for SuperH DAC audio");
423
424	platform_set_drvdata(devptr, card);
425	return 0;
426
427	probe_error:
428	snd_card_free(card);
429	return err;
430	}
431
432	/*
433	* "driver" definition
434	*/
435	static struct platform_driver driver = {
436	.probe = snd_sh_dac_probe,
437	.remove = snd_sh_dac_remove,
438	.driver = {
439	.name = "dac_audio",
440	},
441	};
442
443	static int __init sh_dac_init(void)
444	{
445	return platform_driver_register(&driver);
446	}
447
448	static void __exit sh_dac_exit(void)
449	{
450	platform_driver_unregister(&driver);
451	}
452
453	module_init(sh_dac_init);
454	module_exit(sh_dac_exit);