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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/drivers/hostaudio_kern.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
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!
Diffstat (limited to 'arch/um/drivers/hostaudio_kern.c')
-rw-r--r-- | arch/um/drivers/hostaudio_kern.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c new file mode 100644 index 000000000000..d5742783e19d --- /dev/null +++ b/arch/um/drivers/hostaudio_kern.c @@ -0,0 +1,352 @@ +/* + * 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_PARM(dsp, "s"); +MODULE_PARM_DESC(dsp, DSP_HELP); + +MODULE_PARM(mixer, "s"); +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: + */ |