mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Magnus Damm](/assets/img/avatar_default.png)
This patch modifies sh_dac_audio in the following ways: - use high resolution timer instead of TMU1 - fix cpu/dac.h include - add future rewrite comment Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
312 lines
6.4 KiB
C
312 lines
6.4 KiB
C
/*
|
|
* sound/oss/sh_dac_audio.c
|
|
*
|
|
* SH DAC based sound :(
|
|
*
|
|
* Copyright (C) 2004,2005 Andriy Skulysh
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sound.h>
|
|
#include <linux/soundcard.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/hrtimer.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/delay.h>
|
|
#include <asm/clock.h>
|
|
#include <cpu/dac.h>
|
|
#include <asm/machvec.h>
|
|
#include <mach/hp6xx.h>
|
|
#include <asm/hd64461.h>
|
|
|
|
#define MODNAME "sh_dac_audio"
|
|
|
|
#define BUFFER_SIZE 48000
|
|
|
|
static int rate;
|
|
static int empty;
|
|
static char *data_buffer, *buffer_begin, *buffer_end;
|
|
static int in_use, device_major;
|
|
static struct hrtimer hrtimer;
|
|
static ktime_t wakeups_per_second;
|
|
|
|
static void dac_audio_start_timer(void)
|
|
{
|
|
hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
|
|
}
|
|
|
|
static void dac_audio_stop_timer(void)
|
|
{
|
|
hrtimer_cancel(&hrtimer);
|
|
}
|
|
|
|
static void dac_audio_reset(void)
|
|
{
|
|
dac_audio_stop_timer();
|
|
buffer_begin = buffer_end = data_buffer;
|
|
empty = 1;
|
|
}
|
|
|
|
static void dac_audio_sync(void)
|
|
{
|
|
while (!empty)
|
|
schedule();
|
|
}
|
|
|
|
static void dac_audio_start(void)
|
|
{
|
|
if (mach_is_hp6xx()) {
|
|
u16 v = __raw_readw(HD64461_GPADR);
|
|
v &= ~HD64461_GPADR_SPEAKER;
|
|
__raw_writew(v, HD64461_GPADR);
|
|
}
|
|
|
|
sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
|
|
}
|
|
static void dac_audio_stop(void)
|
|
{
|
|
dac_audio_stop_timer();
|
|
|
|
if (mach_is_hp6xx()) {
|
|
u16 v = __raw_readw(HD64461_GPADR);
|
|
v |= HD64461_GPADR_SPEAKER;
|
|
__raw_writew(v, HD64461_GPADR);
|
|
}
|
|
|
|
sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
|
|
sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
|
|
}
|
|
|
|
static void dac_audio_set_rate(void)
|
|
{
|
|
wakeups_per_second = ktime_set(0, 1000000000 / rate);
|
|
}
|
|
|
|
static int dac_audio_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int val;
|
|
|
|
switch (cmd) {
|
|
case OSS_GETVERSION:
|
|
return put_user(SOUND_VERSION, (int *)arg);
|
|
|
|
case SNDCTL_DSP_SYNC:
|
|
dac_audio_sync();
|
|
return 0;
|
|
|
|
case SNDCTL_DSP_RESET:
|
|
dac_audio_reset();
|
|
return 0;
|
|
|
|
case SNDCTL_DSP_GETFMTS:
|
|
return put_user(AFMT_U8, (int *)arg);
|
|
|
|
case SNDCTL_DSP_SETFMT:
|
|
return put_user(AFMT_U8, (int *)arg);
|
|
|
|
case SNDCTL_DSP_NONBLOCK:
|
|
spin_lock(&file->f_lock);
|
|
file->f_flags |= O_NONBLOCK;
|
|
spin_unlock(&file->f_lock);
|
|
return 0;
|
|
|
|
case SNDCTL_DSP_GETCAPS:
|
|
return 0;
|
|
|
|
case SOUND_PCM_WRITE_RATE:
|
|
val = *(int *)arg;
|
|
if (val > 0) {
|
|
rate = val;
|
|
dac_audio_set_rate();
|
|
}
|
|
return put_user(rate, (int *)arg);
|
|
|
|
case SNDCTL_DSP_STEREO:
|
|
return put_user(0, (int *)arg);
|
|
|
|
case SOUND_PCM_WRITE_CHANNELS:
|
|
return put_user(1, (int *)arg);
|
|
|
|
case SNDCTL_DSP_SETDUPLEX:
|
|
return -EINVAL;
|
|
|
|
case SNDCTL_DSP_PROFILE:
|
|
return -EINVAL;
|
|
|
|
case SNDCTL_DSP_GETBLKSIZE:
|
|
return put_user(BUFFER_SIZE, (int *)arg);
|
|
|
|
case SNDCTL_DSP_SETFRAGMENT:
|
|
return 0;
|
|
|
|
default:
|
|
printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
|
|
cmd);
|
|
return -EINVAL;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
|
|
loff_t * ppos)
|
|
{
|
|
int free;
|
|
int nbytes;
|
|
|
|
if (count < 0)
|
|
return -EINVAL;
|
|
|
|
if (!count) {
|
|
dac_audio_sync();
|
|
return 0;
|
|
}
|
|
|
|
free = buffer_begin - buffer_end;
|
|
|
|
if (free < 0)
|
|
free += BUFFER_SIZE;
|
|
if ((free == 0) && (empty))
|
|
free = BUFFER_SIZE;
|
|
if (count > free)
|
|
count = free;
|
|
if (buffer_begin > buffer_end) {
|
|
if (copy_from_user((void *)buffer_end, buf, count))
|
|
return -EFAULT;
|
|
|
|
buffer_end += count;
|
|
} else {
|
|
nbytes = data_buffer + BUFFER_SIZE - buffer_end;
|
|
if (nbytes > count) {
|
|
if (copy_from_user((void *)buffer_end, buf, count))
|
|
return -EFAULT;
|
|
buffer_end += count;
|
|
} else {
|
|
if (copy_from_user((void *)buffer_end, buf, nbytes))
|
|
return -EFAULT;
|
|
if (copy_from_user
|
|
((void *)data_buffer, buf + nbytes, count - nbytes))
|
|
return -EFAULT;
|
|
buffer_end = data_buffer + count - nbytes;
|
|
}
|
|
}
|
|
|
|
if (empty) {
|
|
empty = 0;
|
|
dac_audio_start_timer();
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t dac_audio_read(struct file *file, char *buf, size_t count,
|
|
loff_t * ppos)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int dac_audio_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (file->f_mode & FMODE_READ)
|
|
return -ENODEV;
|
|
if (in_use)
|
|
return -EBUSY;
|
|
|
|
in_use = 1;
|
|
|
|
dac_audio_start();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dac_audio_release(struct inode *inode, struct file *file)
|
|
{
|
|
dac_audio_sync();
|
|
dac_audio_stop();
|
|
in_use = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations dac_audio_fops = {
|
|
.read = dac_audio_read,
|
|
.write = dac_audio_write,
|
|
.ioctl = dac_audio_ioctl,
|
|
.open = dac_audio_open,
|
|
.release = dac_audio_release,
|
|
};
|
|
|
|
static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
|
|
{
|
|
if (!empty) {
|
|
sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
|
|
buffer_begin++;
|
|
|
|
if (buffer_begin == data_buffer + BUFFER_SIZE)
|
|
buffer_begin = data_buffer;
|
|
if (buffer_begin == buffer_end)
|
|
empty = 1;
|
|
}
|
|
|
|
if (!empty)
|
|
hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static int __init dac_audio_init(void)
|
|
{
|
|
if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
|
|
printk(KERN_ERR "Cannot register dsp device");
|
|
return device_major;
|
|
}
|
|
|
|
in_use = 0;
|
|
|
|
data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
|
|
if (data_buffer == NULL)
|
|
return -ENOMEM;
|
|
|
|
dac_audio_reset();
|
|
rate = 8000;
|
|
dac_audio_set_rate();
|
|
|
|
/* Today: High Resolution Timer driven DAC playback.
|
|
* The timer callback gets called once per sample. Ouch.
|
|
*
|
|
* Future: A much better approach would be to use the
|
|
* SH7720 CMT+DMAC+DAC hardware combination like this:
|
|
* - Program sample rate using CMT0 or CMT1
|
|
* - Program DMAC to use CMT for timing and output to DAC
|
|
* - Play sound using DMAC, let CPU sleep.
|
|
* - While at it, rewrite this driver to use ALSA.
|
|
*/
|
|
|
|
hrtimer_init(&hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
hrtimer.function = sh_dac_audio_timer;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit dac_audio_exit(void)
|
|
{
|
|
unregister_sound_dsp(device_major);
|
|
kfree((void *)data_buffer);
|
|
}
|
|
|
|
module_init(dac_audio_init);
|
|
module_exit(dac_audio_exit);
|
|
|
|
MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
|
|
MODULE_DESCRIPTION("SH DAC sound driver");
|
|
MODULE_LICENSE("GPL");
|