2 * Copyright (C) 2002 Steve Schmidtke
3 * Licensed under the GPL
6 #include "linux/module.h"
7 #include "linux/init.h"
8 #include "linux/slab.h"
10 #include "linux/sound.h"
11 #include "linux/soundcard.h"
12 #include "asm/uaccess.h"
13 #include "kern_util.h"
17 struct hostaudio_state {
21 struct hostmixer_state {
25 #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
26 #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
28 /* Only changed from linux_main at boot time */
29 char *dsp = HOSTAUDIO_DEV_DSP;
30 char *mixer = HOSTAUDIO_DEV_MIXER;
33 " This is used to specify the host dsp device to the hostaudio driver.\n" \
34 " The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
37 " This is used to specify the host mixer device to the hostaudio driver.\n"\
38 " The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
41 static int set_dsp(char *name, int *add)
47 __uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
49 static int set_mixer(char *name, int *add)
55 __uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
59 module_param(dsp, charp, 0644);
60 MODULE_PARM_DESC(dsp, DSP_HELP);
62 module_param(mixer, charp, 0644);
63 MODULE_PARM_DESC(mixer, MIXER_HELP);
67 /* /dev/dsp file operations */
69 static ssize_t hostaudio_read(struct file *file, char __user *buffer,
70 size_t count, loff_t *ppos)
72 struct hostaudio_state *state = file->private_data;
77 printk("hostaudio: read called, count = %d\n", count);
80 kbuf = kmalloc(count, GFP_KERNEL);
84 err = os_read_file(state->fd, kbuf, count);
88 if(copy_to_user(buffer, kbuf, err))
96 static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
97 size_t count, loff_t *ppos)
99 struct hostaudio_state *state = file->private_data;
104 printk("hostaudio: write called, count = %d\n", count);
107 kbuf = kmalloc(count, GFP_KERNEL);
112 if(copy_from_user(kbuf, buffer, count))
115 err = os_write_file(state->fd, kbuf, count);
125 static unsigned int hostaudio_poll(struct file *file,
126 struct poll_table_struct *wait)
128 unsigned int mask = 0;
131 printk("hostaudio: poll called (unimplemented)\n");
137 static int hostaudio_ioctl(struct inode *inode, struct file *file,
138 unsigned int cmd, unsigned long arg)
140 struct hostaudio_state *state = file->private_data;
141 unsigned long data = 0;
145 printk("hostaudio: ioctl called, cmd = %u\n", cmd);
148 case SNDCTL_DSP_SPEED:
149 case SNDCTL_DSP_STEREO:
150 case SNDCTL_DSP_GETBLKSIZE:
151 case SNDCTL_DSP_CHANNELS:
152 case SNDCTL_DSP_SUBDIVIDE:
153 case SNDCTL_DSP_SETFRAGMENT:
154 if(get_user(data, (int __user *) arg))
161 err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
164 case SNDCTL_DSP_SPEED:
165 case SNDCTL_DSP_STEREO:
166 case SNDCTL_DSP_GETBLKSIZE:
167 case SNDCTL_DSP_CHANNELS:
168 case SNDCTL_DSP_SUBDIVIDE:
169 case SNDCTL_DSP_SETFRAGMENT:
170 if(put_user(data, (int __user *) arg))
180 static int hostaudio_open(struct inode *inode, struct file *file)
182 struct hostaudio_state *state;
187 printk("hostaudio: open called (host: %s)\n", dsp);
190 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
194 if(file->f_mode & FMODE_READ) r = 1;
195 if(file->f_mode & FMODE_WRITE) w = 1;
197 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
204 file->private_data = state;
208 static int hostaudio_release(struct inode *inode, struct file *file)
210 struct hostaudio_state *state = file->private_data;
213 printk("hostaudio: release called\n");
216 os_close_file(state->fd);
222 /* /dev/mixer file operations */
224 static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file,
225 unsigned int cmd, unsigned long arg)
227 struct hostmixer_state *state = file->private_data;
230 printk("hostmixer: ioctl called\n");
233 return(os_ioctl_generic(state->fd, cmd, arg));
236 static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
238 struct hostmixer_state *state;
243 printk("hostmixer: open called (host: %s)\n", mixer);
246 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
247 if(state == NULL) return(-ENOMEM);
249 if(file->f_mode & FMODE_READ) r = 1;
250 if(file->f_mode & FMODE_WRITE) w = 1;
252 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
255 printk("hostaudio_open_mixdev failed to open '%s', err = %d\n",
261 file->private_data = state;
265 static int hostmixer_release(struct inode *inode, struct file *file)
267 struct hostmixer_state *state = file->private_data;
270 printk("hostmixer: release called\n");
273 os_close_file(state->fd);
280 /* kernel module operations */
282 static const struct file_operations hostaudio_fops = {
283 .owner = THIS_MODULE,
285 .read = hostaudio_read,
286 .write = hostaudio_write,
287 .poll = hostaudio_poll,
288 .ioctl = hostaudio_ioctl,
290 .open = hostaudio_open,
291 .release = hostaudio_release,
294 static const struct file_operations hostmixer_fops = {
295 .owner = THIS_MODULE,
297 .ioctl = hostmixer_ioctl_mixdev,
298 .open = hostmixer_open_mixdev,
299 .release = hostmixer_release,
307 MODULE_AUTHOR("Steve Schmidtke");
308 MODULE_DESCRIPTION("UML Audio Relay");
309 MODULE_LICENSE("GPL");
311 static int __init hostaudio_init_module(void)
313 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
316 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
317 if(module_data.dev_audio < 0){
318 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
322 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
323 if(module_data.dev_mixer < 0){
324 printk(KERN_ERR "hostmixer: couldn't register mixer "
326 unregister_sound_dsp(module_data.dev_audio);
333 static void __exit hostaudio_cleanup_module (void)
335 unregister_sound_mixer(module_data.dev_mixer);
336 unregister_sound_dsp(module_data.dev_audio);
339 module_init(hostaudio_init_module);
340 module_exit(hostaudio_cleanup_module);
343 * Overrides for Emacs so that we follow Linus's tabbing style.
344 * Emacs will notice this stuff at the end of the file and automatically
345 * adjust the settings for this buffer only. This must remain at the end
347 * ---------------------------------------------------------------------------
349 * c-file-style: "linux"