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path: root/arch/um/drivers/hostaudio_kern.c
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Diffstat (limited to 'arch/um/drivers/hostaudio_kern.c')
-rw-r--r--arch/um/drivers/hostaudio_kern.c169
1 files changed, 79 insertions, 90 deletions
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
index a0d148ea63d..10e08a8c17c 100644
--- a/arch/um/drivers/hostaudio_kern.c
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -15,19 +15,22 @@
#include "os.h"
struct hostaudio_state {
- int fd;
+ int fd;
};
struct hostmixer_state {
- int fd;
+ 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;
+/* 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" \
@@ -69,12 +72,12 @@ MODULE_PARM_DESC(mixer, MIXER_HELP);
static ssize_t hostaudio_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
- struct hostaudio_state *state = file->private_data;
+ struct hostaudio_state *state = file->private_data;
void *kbuf;
int err;
#ifdef DEBUG
- printk("hostaudio: read called, count = %d\n", count);
+ printk("hostaudio: read called, count = %d\n", count);
#endif
kbuf = kmalloc(count, GFP_KERNEL);
@@ -88,7 +91,7 @@ static ssize_t hostaudio_read(struct file *file, char __user *buffer,
if(copy_to_user(buffer, kbuf, err))
err = -EFAULT;
- out:
+out:
kfree(kbuf);
return(err);
}
@@ -96,12 +99,12 @@ static ssize_t hostaudio_read(struct file *file, char __user *buffer,
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;
+ struct hostaudio_state *state = file->private_data;
void *kbuf;
int err;
#ifdef DEBUG
- printk("hostaudio: write called, count = %d\n", count);
+ printk("hostaudio: write called, count = %d\n", count);
#endif
kbuf = kmalloc(count, GFP_KERNEL);
@@ -125,24 +128,24 @@ static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
static unsigned int hostaudio_poll(struct file *file,
struct poll_table_struct *wait)
{
- unsigned int mask = 0;
+ unsigned int mask = 0;
#ifdef DEBUG
- printk("hostaudio: poll called (unimplemented)\n");
+ printk("hostaudio: poll called (unimplemented)\n");
#endif
- return(mask);
+ 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;
+ struct hostaudio_state *state = file->private_data;
unsigned long data = 0;
int err;
#ifdef DEBUG
- printk("hostaudio: ioctl called, cmd = %u\n", cmd);
+ printk("hostaudio: ioctl called, cmd = %u\n", cmd);
#endif
switch(cmd){
case SNDCTL_DSP_SPEED:
@@ -179,42 +182,40 @@ static int hostaudio_ioctl(struct inode *inode, struct file *file,
static int hostaudio_open(struct inode *inode, struct file *file)
{
- struct hostaudio_state *state;
- int r = 0, w = 0;
- int ret;
+ struct hostaudio_state *state;
+ int r = 0, w = 0;
+ int ret;
#ifdef DEBUG
- printk("hostaudio: open called (host: %s)\n", dsp);
+ printk("hostaudio: open called (host: %s)\n", dsp);
#endif
- state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
- if(state == NULL)
+ 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;
+ 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){
+ if(ret < 0){
kfree(state);
return(ret);
- }
-
+ }
state->fd = ret;
- file->private_data = state;
- return(0);
+ file->private_data = state;
+ return(0);
}
static int hostaudio_release(struct inode *inode, struct file *file)
{
- struct hostaudio_state *state = file->private_data;
+ struct hostaudio_state *state = file->private_data;
#ifdef DEBUG
- printk("hostaudio: release called\n");
+ printk("hostaudio: release called\n");
#endif
-
- os_close_file(state->fd);
- kfree(state);
+ os_close_file(state->fd);
+ kfree(state);
return(0);
}
@@ -224,10 +225,10 @@ static int hostaudio_release(struct inode *inode, struct file *file)
static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
- struct hostmixer_state *state = file->private_data;
+ struct hostmixer_state *state = file->private_data;
#ifdef DEBUG
- printk("hostmixer: ioctl called\n");
+ printk("hostmixer: ioctl called\n");
#endif
return(os_ioctl_generic(state->fd, cmd, arg));
@@ -235,68 +236,67 @@ static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file,
static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
{
- struct hostmixer_state *state;
- int r = 0, w = 0;
- int ret;
+ struct hostmixer_state *state;
+ int r = 0, w = 0;
+ int ret;
#ifdef DEBUG
- printk("hostmixer: open called (host: %s)\n", mixer);
+ printk("hostmixer: open called (host: %s)\n", mixer);
#endif
- state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
- if(state == NULL) return(-ENOMEM);
+ 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;
+ 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){
+ 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);
+ file->private_data = state;
+ return(0);
}
static int hostmixer_release(struct inode *inode, struct file *file)
{
- struct hostmixer_state *state = file->private_data;
+ struct hostmixer_state *state = file->private_data;
#ifdef DEBUG
- printk("hostmixer: release called\n");
+ printk("hostmixer: release called\n");
#endif
- os_close_file(state->fd);
- kfree(state);
+ 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,
- .ioctl = hostaudio_ioctl,
- .mmap = NULL,
- .open = hostaudio_open,
- .release = hostaudio_release,
+ .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 const struct file_operations hostmixer_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .ioctl = hostmixer_ioctl_mixdev,
- .open = hostmixer_open_mixdev,
- .release = hostmixer_release,
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .ioctl = hostmixer_ioctl_mixdev,
+ .open = hostmixer_open_mixdev,
+ .release = hostmixer_release,
};
struct {
@@ -310,42 +310,31 @@ MODULE_LICENSE("GPL");
static int __init hostaudio_init_module(void)
{
- printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
+ 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;
- }
+ 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 "
+ 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;
- }
+ unregister_sound_dsp(module_data.dev_audio);
+ return -ENODEV;
+ }
- return 0;
+ return 0;
}
static void __exit hostaudio_cleanup_module (void)
{
- unregister_sound_mixer(module_data.dev_mixer);
- unregister_sound_dsp(module_data.dev_audio);
+ 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:
- */
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