/* * 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: */