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/*
* Copyright (C) 2002 Steve Schmidtke
* Licensed under the GPL
*/
#include "linux/config.h"
#include "linux/module.h"
#include "linux/init.h"
#include "linux/slab.h"
#include "linux/fs.h"
#include "linux/sound.h"
#include "linux/soundcard.h"
#include "asm/uaccess.h"
#include "kern_util.h"
#include "init.h"
#include "os.h"
struct hostaudio_state {
int fd;
};
struct hostmixer_state {
int fd;
};
#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
/* Only changed from linux_main at boot time */
char *dsp = HOSTAUDIO_DEV_DSP;
char *mixer = HOSTAUDIO_DEV_MIXER;
#define DSP_HELP \
" This is used to specify the host dsp device to the hostaudio driver.\n" \
" The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
#define MIXER_HELP \
" This is used to specify the host mixer device to the hostaudio driver.\n"\
" The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
#ifndef MODULE
static int set_dsp(char *name, int *add)
{
dsp = name;
return(0);
}
__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
static int set_mixer(char *name, int *add)
{
mixer = name;
return(0);
}
__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
#else /*MODULE*/
module_param(dsp, charp, 0644);
MODULE_PARM_DESC(dsp, DSP_HELP);
module_param(mixer, charp, 0644);
MODULE_PARM_DESC(mixer, MIXER_HELP);
#endif
/* /dev/dsp file operations */
static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count,
loff_t *ppos)
{
struct hostaudio_state *state = file->private_data;
void *kbuf;
int err;
#ifdef DEBUG
printk("hostaudio: read called, count = %d\n", count);
#endif
kbuf = kmalloc(count, GFP_KERNEL);
if(kbuf == NULL)
return(-ENOMEM);
err = os_read_file(state->fd, kbuf, count);
if(err < 0)
goto out;
if(copy_to_user(buffer, kbuf, err))
err = -EFAULT;
out:
kfree(kbuf);
return(err);
}
static ssize_t hostaudio_write(struct file *file, const char *buffer,
size_t count, loff_t *ppos)
{
struct hostaudio_state *state = file->private_data;
void *kbuf;
int err;
#ifdef DEBUG
printk("hostaudio: write called, count = %d\n", count);
#endif
kbuf = kmalloc(count, GFP_KERNEL);
if(kbuf == NULL)
return(-ENOMEM);
err = -EFAULT;
if(copy_from_user(kbuf, buffer, count))
goto out;
err = os_write_file(state->fd, kbuf, count);
if(err < 0)
goto out;
*ppos += err;
out:
kfree(kbuf);
return(err);
}
static unsigned int hostaudio_poll(struct file *file,
struct poll_table_struct *wait)
{
unsigned int mask = 0;
#ifdef DEBUG
printk("hostaudio: poll called (unimplemented)\n");
#endif
return(mask);
}
static int hostaudio_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct hostaudio_state *state = file->private_data;
unsigned long data = 0;
int err;
#ifdef DEBUG
printk("hostaudio: ioctl called, cmd = %u\n", cmd);
#endif
switch(cmd){
case SNDCTL_DSP_SPEED:
case SNDCTL_DSP_STEREO:
case SNDCTL_DSP_GETBLKSIZE:
case SNDCTL_DSP_CHANNELS:
case SNDCTL_DSP_SUBDIVIDE:
case SNDCTL_DSP_SETFRAGMENT:
if(get_user(data, (int *) arg))
return(-EFAULT);
break;
default:
break;
}
err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
switch(cmd){
case SNDCTL_DSP_SPEED:
case SNDCTL_DSP_STEREO:
case SNDCTL_DSP_GETBLKSIZE:
case SNDCTL_DSP_CHANNELS:
case SNDCTL_DSP_SUBDIVIDE:
case SNDCTL_DSP_SETFRAGMENT:
if(put_user(data, (int *) arg))
return(-EFAULT);
break;
default:
break;
}
return(err);
}
static int hostaudio_open(struct inode *inode, struct file *file)
{
struct hostaudio_state *state;
int r = 0, w = 0;
int ret;
#ifdef DEBUG
printk("hostaudio: open called (host: %s)\n", dsp);
#endif
state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
if(state == NULL)
return(-ENOMEM);
if(file->f_mode & FMODE_READ) r = 1;
if(file->f_mode & FMODE_WRITE) w = 1;
ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
if(ret < 0){
kfree(state);
return(ret);
}
state->fd = ret;
file->private_data = state;
return(0);
}
static int hostaudio_release(struct inode *inode, struct file *file)
{
struct hostaudio_state *state = file->private_data;
#ifdef DEBUG
printk("hostaudio: release called\n");
#endif
os_close_file(state->fd);
kfree(state);
return(0);
}
/* /dev/mixer file operations */
static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct hostmixer_state *state = file->private_data;
#ifdef DEBUG
printk("hostmixer: ioctl called\n");
#endif
return(os_ioctl_generic(state->fd, cmd, arg));
}
static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
{
struct hostmixer_state *state;
int r = 0, w = 0;
int ret;
#ifdef DEBUG
printk("hostmixer: open called (host: %s)\n", mixer);
#endif
state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
if(state == NULL) return(-ENOMEM);
if(file->f_mode & FMODE_READ) r = 1;
if(file->f_mode & FMODE_WRITE) w = 1;
ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
if(ret < 0){
printk("hostaudio_open_mixdev failed to open '%s', err = %d\n",
dsp, -ret);
kfree(state);
return(ret);
}
file->private_data = state;
return(0);
}
static int hostmixer_release(struct inode *inode, struct file *file)
{
struct hostmixer_state *state = file->private_data;
#ifdef DEBUG
printk("hostmixer: release called\n");
#endif
os_close_file(state->fd);
kfree(state);
return(0);
}
/* kernel module operations */
static struct file_operations hostaudio_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = hostaudio_read,
.write = hostaudio_write,
.poll = hostaudio_poll,
.ioctl = hostaudio_ioctl,
.mmap = NULL,
.open = hostaudio_open,
.release = hostaudio_release,
};
static struct file_operations hostmixer_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.ioctl = hostmixer_ioctl_mixdev,
.open = hostmixer_open_mixdev,
.release = hostmixer_release,
};
struct {
int dev_audio;
int dev_mixer;
} module_data;
MODULE_AUTHOR("Steve Schmidtke");
MODULE_DESCRIPTION("UML Audio Relay");
MODULE_LICENSE("GPL");
static int __init hostaudio_init_module(void)
{
printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
dsp, mixer);
module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
if(module_data.dev_audio < 0){
printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
return -ENODEV;
}
module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
if(module_data.dev_mixer < 0){
printk(KERN_ERR "hostmixer: couldn't register mixer "
"device!\n");
unregister_sound_dsp(module_data.dev_audio);
return -ENODEV;
}
return 0;
}
static void __exit hostaudio_cleanup_module (void)
{
unregister_sound_mixer(module_data.dev_mixer);
unregister_sound_dsp(module_data.dev_audio);
}
module_init(hostaudio_init_module);
module_exit(hostaudio_cleanup_module);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
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