1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
353 lines
7.8 KiB
C
353 lines
7.8 KiB
C
/*
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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/config.h"
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#include "linux/module.h"
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#include "linux/init.h"
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#include "linux/slab.h"
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#include "linux/fs.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 "kern_util.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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/* Only changed from linux_main at boot time */
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char *dsp = HOSTAUDIO_DEV_DSP;
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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_PARM(dsp, "s");
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MODULE_PARM_DESC(dsp, DSP_HELP);
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MODULE_PARM(mixer, "s");
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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 *buffer, size_t count,
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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("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 *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("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("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("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 *) 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 *) 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("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) r = 1;
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if(file->f_mode & FMODE_WRITE) 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("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("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("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) return(-ENOMEM);
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if(file->f_mode & FMODE_READ) r = 1;
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if(file->f_mode & FMODE_WRITE) 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("hostaudio_open_mixdev failed to open '%s', err = %d\n",
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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("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 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 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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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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