/* * 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 <linux/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 = memdup_user(buffer, count); if (IS_ERR(kbuf)) return PTR_ERR(kbuf); err = os_write_file(state->fd, kbuf, count); if (err < 0) goto out; *ppos += err; out: kfree(kbuf); return err; } static __poll_t hostaudio_poll(struct file *file, struct poll_table_struct *wait) { __poll_t 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);