+++ /dev/null
-/*
- * 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/mutex.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 DEFINE_MUTEX(sh_dac_audio_mutex);
-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 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 long dac_audio_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
-{
- int ret;
-
- mutex_lock(&sh_dac_audio_mutex);
- ret = dac_audio_ioctl(file, cmd, arg);
- mutex_unlock(&sh_dac_audio_mutex);
-
- return ret;
-}
-
-static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
- loff_t * ppos)
-{
- int free;
- int nbytes;
-
- 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;
-
- mutex_lock(&sh_dac_audio_mutex);
- if (in_use) {
- mutex_unlock(&sh_dac_audio_mutex);
- return -EBUSY;
- }
-
- in_use = 1;
-
- dac_audio_start();
- mutex_unlock(&sh_dac_audio_mutex);
- 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,
- .unlocked_ioctl = dac_audio_unlocked_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");
git://bbs.cooldavid.org / net-next-2.6.git / commitdiff