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

/*
 * sh_dac_audio.c - SuperH DAC audio driver for ALSA
 *
 * Copyright (c) 2009 by Rafael Ignacio Zurita <[email protected]>
 *
 *
 * 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 <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 <[email protected]>");
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 <[email protected]>
	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>
da155d5b	30	#include <linux/module.h>
9dcaa7b2 RIZ	31	#include <sound/core.h>
	32	#include <sound/initval.h>
	33	#include <sound/pcm.h>
	34	#include <sound/sh_dac_audio.h>
	35	#include <asm/clock.h>
	36	#include <asm/hd64461.h>
	37	#include <mach/hp6xx.h>
	38	#include <cpu/dac.h>
	39
	40	MODULE_AUTHOR("Rafael Ignacio Zurita <[email protected]>");
	41	MODULE_DESCRIPTION("SuperH DAC audio driver");
	42	MODULE_LICENSE("GPL");
	43	MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
	44
	45	/* Module Parameters */
	46	static int index = SNDRV_DEFAULT_IDX1;
	47	static char *id = SNDRV_DEFAULT_STR1;
	48	module_param(index, int, 0444);
	49	MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
	50	module_param(id, charp, 0444);
	51	MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
	52
	53	/* main struct */
	54	struct snd_sh_dac {
	55	struct snd_card *card;
	56	struct snd_pcm_substream *substream;
	57	struct hrtimer hrtimer;
	58	ktime_t wakeups_per_second;
	59
	60	int rate;
	61	int empty;
	62	char data_buffer, buffer_begin, *buffer_end;
	63	int processed; /* bytes proccesed, to compare with period_size */
	64	int buffer_size;
	65	struct dac_audio_pdata *pdata;
	66	};
	67
	68
	69	static void dac_audio_start_timer(struct snd_sh_dac *chip)
	70	{
	71	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
	72	HRTIMER_MODE_REL);
	73	}
	74
	75	static void dac_audio_stop_timer(struct snd_sh_dac *chip)
	76	{
	77	hrtimer_cancel(&chip->hrtimer);
	78	}
	79
	80	static void dac_audio_reset(struct snd_sh_dac *chip)
	81	{
	82	dac_audio_stop_timer(chip);
	83	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
	84	chip->processed = 0;
	85	chip->empty = 1;
	86	}
	87
	88	static void dac_audio_set_rate(struct snd_sh_dac *chip)
	89	{
	90	chip->wakeups_per_second = ktime_set(0, 1000000000 / chip->rate);
	91	}
	92
	93
	94	/* PCM INTERFACE */
95
96	static struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
97	.info = (SNDRV_PCM_INFO_MMAP \|
98	SNDRV_PCM_INFO_MMAP_VALID \|
99	SNDRV_PCM_INFO_INTERLEAVED \|
100	SNDRV_PCM_INFO_HALF_DUPLEX),
101	.formats = SNDRV_PCM_FMTBIT_U8,
102	.rates = SNDRV_PCM_RATE_8000,
103	.rate_min = 8000,
104	.rate_max = 8000,
105	.channels_min = 1,
106	.channels_max = 1,
107	.buffer_bytes_max = (48*1024),
108	.period_bytes_min = 1,
109	.period_bytes_max = (48*1024),
110	.periods_min = 1,
111	.periods_max = 1024,
112	};
113
114	static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
115	{
116	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
117	struct snd_pcm_runtime *runtime = substream->runtime;
118
119	runtime->hw = snd_sh_dac_pcm_hw;
120
121	chip->substream = substream;
122	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
123	chip->processed = 0;
124	chip->empty = 1;
125
126	chip->pdata->start(chip->pdata);
127
128	return 0;
129	}
130
131	static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
132	{
133	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
134
135	chip->substream = NULL;
136
137	dac_audio_stop_timer(chip);
138	chip->pdata->stop(chip->pdata);
139
140	return 0;
141	}
142
143	static int snd_sh_dac_pcm_hw_params(struct snd_pcm_substream *substream,
144	struct snd_pcm_hw_params *hw_params)
145	{
146	return snd_pcm_lib_malloc_pages(substream,
147	params_buffer_bytes(hw_params));
148	}
149
150	static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
151	{
152	return snd_pcm_lib_free_pages(substream);
153	}
154
155	static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
156	{
157	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
158	struct snd_pcm_runtime *runtime = chip->substream->runtime;
159
160	chip->buffer_size = runtime->buffer_size;
161	memset(chip->data_buffer, 0, chip->pdata->buffer_size);
162
163	return 0;
164	}
165
166	static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
167	{
168	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
169
170	switch (cmd) {
171	case SNDRV_PCM_TRIGGER_START:
172	dac_audio_start_timer(chip);
173	break;
174	case SNDRV_PCM_TRIGGER_STOP:
175	chip->buffer_begin = chip->buffer_end = chip->data_buffer;
176	chip->processed = 0;
177	chip->empty = 1;
178	dac_audio_stop_timer(chip);
179	break;
180	default:
181	return -EINVAL;
182	}
183
184	return 0;
185	}
186
187	static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, int channel,
188	snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t count)
189	{
190	/* channel is not used (interleaved data) */
191	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
192	struct snd_pcm_runtime *runtime = substream->runtime;
193	ssize_t b_count = frames_to_bytes(runtime , count);
194	ssize_t b_pos = frames_to_bytes(runtime , pos);
195
196	if (count < 0)
197	return -EINVAL;
198
199	if (!count)
200	return 0;
201
202	memcpy_toio(chip->data_buffer + b_pos, src, b_count);
203	chip->buffer_end = chip->data_buffer + b_pos + b_count;
204
205	if (chip->empty) {
206	chip->empty = 0;
207	dac_audio_start_timer(chip);
208	}
209
210	return 0;
211	}
212
213	static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
214	int channel, snd_pcm_uframes_t pos,
215	snd_pcm_uframes_t count)
216	{
217	/* channel is not used (interleaved data) */
218	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
219	struct snd_pcm_runtime *runtime = substream->runtime;
220	ssize_t b_count = frames_to_bytes(runtime , count);
221	ssize_t b_pos = frames_to_bytes(runtime , pos);
222
223	if (count < 0)
224	return -EINVAL;
225
226	if (!count)
227	return 0;
228
229	memset_io(chip->data_buffer + b_pos, 0, b_count);
230	chip->buffer_end = chip->data_buffer + b_pos + b_count;
231
232	if (chip->empty) {
233	chip->empty = 0;
234	dac_audio_start_timer(chip);
235	}
236
237	return 0;
238	}
239
240	static
241	snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
242	{
243	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
244	int pointer = chip->buffer_begin - chip->data_buffer;
245
246	return pointer;
247	}
248
249	/* pcm ops */
250	static struct snd_pcm_ops snd_sh_dac_pcm_ops = {
251	.open = snd_sh_dac_pcm_open,
252	.close = snd_sh_dac_pcm_close,
253	.ioctl = snd_pcm_lib_ioctl,
254	.hw_params = snd_sh_dac_pcm_hw_params,
255	.hw_free = snd_sh_dac_pcm_hw_free,
256	.prepare = snd_sh_dac_pcm_prepare,
257	.trigger = snd_sh_dac_pcm_trigger,
258	.pointer = snd_sh_dac_pcm_pointer,
259	.copy = snd_sh_dac_pcm_copy,
260	.silence = snd_sh_dac_pcm_silence,
261	.mmap = snd_pcm_lib_mmap_iomem,
262	};
263
264	static int __devinit snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
265	{
266	int err;
267	struct snd_pcm *pcm;
268
269	/* device should be always 0 for us */
270	err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
271	if (err < 0)
272	return err;
273
274	pcm->private_data = chip;
275	strcpy(pcm->name, "SH_DAC PCM");
276	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
277
278	/* buffer size=48K */
279	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
280	snd_dma_continuous_data(GFP_KERNEL),
281	48 * 1024,
282	48 * 1024);
283
284	return 0;
285	}
286	/* END OF PCM INTERFACE */
287
288
289	/* driver .remove -- destructor */
290	static int snd_sh_dac_remove(struct platform_device *devptr)
291	{
292	snd_card_free(platform_get_drvdata(devptr));
293	platform_set_drvdata(devptr, NULL);
294
295	return 0;
296	}
297
298	/* free -- it has been defined by create */
299	static int snd_sh_dac_free(struct snd_sh_dac *chip)
300	{
301	/* release the data */
302	kfree(chip->data_buffer);
303	kfree(chip);
304
305	return 0;
306	}
307
308	static int snd_sh_dac_dev_free(struct snd_device *device)
309	{
310	struct snd_sh_dac *chip = device->device_data;
311
312	return snd_sh_dac_free(chip);
313	}
314
315	static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
316	{
317	struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
318	hrtimer);
319	struct snd_pcm_runtime *runtime = chip->substream->runtime;
320	ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
321
322	if (!chip->empty) {
323	sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
324	chip->buffer_begin++;
325
326	chip->processed++;
327	if (chip->processed >= b_ps) {
328	chip->processed -= b_ps;
329	snd_pcm_period_elapsed(chip->substream);
330	}
331
332	if (chip->buffer_begin == (chip->data_buffer +
333	chip->buffer_size - 1))
334	chip->buffer_begin = chip->data_buffer;
335
336	if (chip->buffer_begin == chip->buffer_end)
337	chip->empty = 1;
338
339	}
340
341	if (!chip->empty)
342	hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
343	HRTIMER_MODE_REL);
344
345	return HRTIMER_NORESTART;
346	}
347
348	/* create -- chip-specific constructor for the cards components */
349	static int __devinit snd_sh_dac_create(struct snd_card *card,
350	struct platform_device *devptr,
351	struct snd_sh_dac **rchip)
352	{
353	struct snd_sh_dac *chip;
354	int err;
355
356	static struct snd_device_ops ops = {
357	.dev_free = snd_sh_dac_dev_free,
358	};
359
360	*rchip = NULL;
361
362	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
363	if (chip == NULL)
364	return -ENOMEM;
365
366	chip->card = card;
367
368	hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
369	chip->hrtimer.function = sh_dac_audio_timer;
370
371	dac_audio_reset(chip);
372	chip->rate = 8000;
373	dac_audio_set_rate(chip);
374
375	chip->pdata = devptr->dev.platform_data;
376
377	chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
378	if (chip->data_buffer == NULL) {
379	kfree(chip);
380	return -ENOMEM;
381	}
382
383	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
384	if (err < 0) {
385	snd_sh_dac_free(chip);
386	return err;
387	}
388
389	*rchip = chip;
390
391	return 0;
392	}
393
394	/* driver .probe -- constructor */
395	static int __devinit snd_sh_dac_probe(struct platform_device *devptr)
396	{
397	struct snd_sh_dac *chip;
398	struct snd_card *card;
399	int err;
400
401	err = snd_card_create(index, id, THIS_MODULE, 0, &card);
402	if (err < 0) {
403	snd_printk(KERN_ERR "cannot allocate the card\n");
404	return err;
405	}
406
407	err = snd_sh_dac_create(card, devptr, &chip);
408	if (err < 0)
409	goto probe_error;
410
411	err = snd_sh_dac_pcm(chip, 0);
412	if (err < 0)
413	goto probe_error;
414
415	strcpy(card->driver, "snd_sh_dac");
416	strcpy(card->shortname, "SuperH DAC audio driver");
417	printk(KERN_INFO "%s %s", card->longname, card->shortname);
418
419	err = snd_card_register(card);
420	if (err < 0)
421	goto probe_error;
422
423	snd_printk("ALSA driver for SuperH DAC audio");
424
425	platform_set_drvdata(devptr, card);
426	return 0;
427
428	probe_error:
429	snd_card_free(card);
430	return err;
431	}
432
433	/*
434	* "driver" definition
435	*/
436	static struct platform_driver driver = {
437	.probe = snd_sh_dac_probe,
438	.remove = snd_sh_dac_remove,
439	.driver = {
440	.name = "dac_audio",
441	},
442	};
443
444	static int __init sh_dac_init(void)
445	{
446	return platform_driver_register(&driver);
447	}
448
449	static void __exit sh_dac_exit(void)
450	{
451	platform_driver_unregister(&driver);
452	}
453
454	module_init(sh_dac_init);
455	module_exit(sh_dac_exit);