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|
/*
* 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 <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 = 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"
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