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- /*
- * Copyright (C) 2002 Steve Schmidtke
- * Licensed under the GPL
- */
- #include <linux/fs.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/sound.h>
- #include <linux/soundcard.h>
- #include <linux/mutex.h>
- #include <asm/uaccess.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"
- /*
- * Changed either at boot time or module load time. At boot, this is
- * single-threaded; at module load, multiple modules would each have
- * their own copy of these variables.
- */
- static char *dsp = HOSTAUDIO_DEV_DSP;
- static 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"
- module_param(dsp, charp, 0644);
- MODULE_PARM_DESC(dsp, DSP_HELP);
- module_param(mixer, charp, 0644);
- MODULE_PARM_DESC(mixer, MIXER_HELP);
- #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);
- #endif
- static DEFINE_MUTEX(hostaudio_mutex);
- /* /dev/dsp file operations */
- static ssize_t hostaudio_read(struct file *file, char __user *buffer,
- size_t count, loff_t *ppos)
- {
- struct hostaudio_state *state = file->private_data;
- void *kbuf;
- int err;
- #ifdef DEBUG
- printk(KERN_DEBUG "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 __user *buffer,
- size_t count, loff_t *ppos)
- {
- struct hostaudio_state *state = file->private_data;
- void *kbuf;
- int err;
- #ifdef DEBUG
- printk(KERN_DEBUG "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(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
- #endif
- return mask;
- }
- static long hostaudio_ioctl(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(KERN_DEBUG "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 __user *) 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 __user *) 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
- kernel_param_lock(THIS_MODULE);
- printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
- kernel_param_unlock(THIS_MODULE);
- #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;
- kernel_param_lock(THIS_MODULE);
- mutex_lock(&hostaudio_mutex);
- ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
- mutex_unlock(&hostaudio_mutex);
- kernel_param_unlock(THIS_MODULE);
- 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(KERN_DEBUG "hostaudio: release called\n");
- #endif
- os_close_file(state->fd);
- kfree(state);
- return 0;
- }
- /* /dev/mixer file operations */
- static long hostmixer_ioctl_mixdev(struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- struct hostmixer_state *state = file->private_data;
- #ifdef DEBUG
- printk(KERN_DEBUG "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(KERN_DEBUG "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;
- kernel_param_lock(THIS_MODULE);
- mutex_lock(&hostaudio_mutex);
- ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
- mutex_unlock(&hostaudio_mutex);
- kernel_param_unlock(THIS_MODULE);
- if (ret < 0) {
- kernel_param_lock(THIS_MODULE);
- printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
- "err = %d\n", dsp, -ret);
- kernel_param_unlock(THIS_MODULE);
- 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(KERN_DEBUG "hostmixer: release called\n");
- #endif
- os_close_file(state->fd);
- kfree(state);
- return 0;
- }
- /* kernel module operations */
- static const struct file_operations hostaudio_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .read = hostaudio_read,
- .write = hostaudio_write,
- .poll = hostaudio_poll,
- .unlocked_ioctl = hostaudio_ioctl,
- .mmap = NULL,
- .open = hostaudio_open,
- .release = hostaudio_release,
- };
- static const struct file_operations hostmixer_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .unlocked_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)
- {
- kernel_param_lock(THIS_MODULE);
- printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
- dsp, mixer);
- kernel_param_unlock(THIS_MODULE);
- 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);
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