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