linux/sound/sh/sh_dac_audio.c
Paul Mundt d4c6983859 ALSA: sh: Fix up namespace collision in sh_dac_audio.
The module_platform_driver() conversion ended up tripping over the driver
name, leading to confusion in the macro with regards to 'driver' being
redefined. rename it to something slightly more suitable to avoid
namespace collisions.

sound/sh/sh_dac_audio.c:444:122: error: conflicting types for 'driver_init'
include/linux/device.h:773:6: note: previous declaration of 'driver_init' was here
make[3]: *** [sound/sh/sh_dac_audio.o] Error 1

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-05-21 11:31:14 +02:00

445 lines
11 KiB
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 <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", 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 sh_dac_driver = {
.probe = snd_sh_dac_probe,
.remove = snd_sh_dac_remove,
.driver = {
.name = "dac_audio",
},
};
module_platform_driver(sh_dac_driver);