diff options
Diffstat (limited to 'sound/oss/sh_dac_audio.c')
| -rw-r--r-- | sound/oss/sh_dac_audio.c | 325 |
1 files changed, 0 insertions, 325 deletions
diff --git a/sound/oss/sh_dac_audio.c b/sound/oss/sh_dac_audio.c deleted file mode 100644 index 479e3025a8a..00000000000 --- a/sound/oss/sh_dac_audio.c +++ /dev/null @@ -1,325 +0,0 @@ -/* - * 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/smp_lock.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 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; - - lock_kernel(); - ret = dac_audio_ioctl(file, cmd, arg); - unlock_kernel(); - - 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; - - lock_kernel(); - if (in_use) { - unlock_kernel(); - return -EBUSY; - } - - in_use = 1; - - dac_audio_start(); - unlock_kernel(); - 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"); |