2 * Copyright (C) 2002 Steve Schmidtke
3 * Licensed under the GPL
7 #include "linux/module.h"
8 #include "linux/slab.h"
9 #include "linux/sound.h"
10 #include "linux/soundcard.h"
11 #include "linux/smp_lock.h"
12 #include "asm/uaccess.h"
16 struct hostaudio_state {
20 struct hostmixer_state {
24 #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
25 #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
28 * Changed either at boot time or module load time. At boot, this is
29 * single-threaded; at module load, multiple modules would each have
30 * their own copy of these variables.
32 static char *dsp = HOSTAUDIO_DEV_DSP;
33 static char *mixer = HOSTAUDIO_DEV_MIXER;
36 " This is used to specify the host dsp device to the hostaudio driver.\n" \
37 " The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
40 " This is used to specify the host mixer device to the hostaudio driver.\n"\
41 " The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
44 static int set_dsp(char *name, int *add)
50 __uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
52 static int set_mixer(char *name, int *add)
58 __uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
62 module_param(dsp, charp, 0644);
63 MODULE_PARM_DESC(dsp, DSP_HELP);
65 module_param(mixer, charp, 0644);
66 MODULE_PARM_DESC(mixer, MIXER_HELP);
70 /* /dev/dsp file operations */
72 static ssize_t hostaudio_read(struct file *file, char __user *buffer,
73 size_t count, loff_t *ppos)
75 struct hostaudio_state *state = file->private_data;
80 printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count);
83 kbuf = kmalloc(count, GFP_KERNEL);
87 err = os_read_file(state->fd, kbuf, count);
91 if (copy_to_user(buffer, kbuf, err))
99 static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
100 size_t count, loff_t *ppos)
102 struct hostaudio_state *state = file->private_data;
107 printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
110 kbuf = kmalloc(count, GFP_KERNEL);
115 if (copy_from_user(kbuf, buffer, count))
118 err = os_write_file(state->fd, kbuf, count);
128 static unsigned int hostaudio_poll(struct file *file,
129 struct poll_table_struct *wait)
131 unsigned int mask = 0;
134 printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
140 static long hostaudio_ioctl(struct file *file,
141 unsigned int cmd, unsigned long arg)
143 struct hostaudio_state *state = file->private_data;
144 unsigned long data = 0;
148 printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd);
151 case SNDCTL_DSP_SPEED:
152 case SNDCTL_DSP_STEREO:
153 case SNDCTL_DSP_GETBLKSIZE:
154 case SNDCTL_DSP_CHANNELS:
155 case SNDCTL_DSP_SUBDIVIDE:
156 case SNDCTL_DSP_SETFRAGMENT:
157 if (get_user(data, (int __user *) arg))
164 err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
167 case SNDCTL_DSP_SPEED:
168 case SNDCTL_DSP_STEREO:
169 case SNDCTL_DSP_GETBLKSIZE:
170 case SNDCTL_DSP_CHANNELS:
171 case SNDCTL_DSP_SUBDIVIDE:
172 case SNDCTL_DSP_SETFRAGMENT:
173 if (put_user(data, (int __user *) arg))
183 static int hostaudio_open(struct inode *inode, struct file *file)
185 struct hostaudio_state *state;
190 kparam_block_sysfs_write(dsp);
191 printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
192 kparam_unblock_sysfs_write(dsp);
195 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
199 if (file->f_mode & FMODE_READ)
201 if (file->f_mode & FMODE_WRITE)
204 kparam_block_sysfs_write(dsp);
206 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
208 kparam_unblock_sysfs_write(dsp);
215 file->private_data = state;
219 static int hostaudio_release(struct inode *inode, struct file *file)
221 struct hostaudio_state *state = file->private_data;
224 printk(KERN_DEBUG "hostaudio: release called\n");
226 os_close_file(state->fd);
232 /* /dev/mixer file operations */
234 static long hostmixer_ioctl_mixdev(struct file *file,
235 unsigned int cmd, unsigned long arg)
237 struct hostmixer_state *state = file->private_data;
240 printk(KERN_DEBUG "hostmixer: ioctl called\n");
243 return os_ioctl_generic(state->fd, cmd, arg);
246 static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
248 struct hostmixer_state *state;
253 printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer);
256 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
260 if (file->f_mode & FMODE_READ)
262 if (file->f_mode & FMODE_WRITE)
265 kparam_block_sysfs_write(mixer);
267 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
269 kparam_unblock_sysfs_write(mixer);
272 kparam_block_sysfs_write(dsp);
273 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
274 "err = %d\n", dsp, -ret);
275 kparam_unblock_sysfs_write(dsp);
280 file->private_data = state;
284 static int hostmixer_release(struct inode *inode, struct file *file)
286 struct hostmixer_state *state = file->private_data;
289 printk(KERN_DEBUG "hostmixer: release called\n");
292 os_close_file(state->fd);
298 /* kernel module operations */
300 static const struct file_operations hostaudio_fops = {
301 .owner = THIS_MODULE,
303 .read = hostaudio_read,
304 .write = hostaudio_write,
305 .poll = hostaudio_poll,
306 .unlocked_ioctl = hostaudio_ioctl,
308 .open = hostaudio_open,
309 .release = hostaudio_release,
312 static const struct file_operations hostmixer_fops = {
313 .owner = THIS_MODULE,
315 .unlocked_ioctl = hostmixer_ioctl_mixdev,
316 .open = hostmixer_open_mixdev,
317 .release = hostmixer_release,
325 MODULE_AUTHOR("Steve Schmidtke");
326 MODULE_DESCRIPTION("UML Audio Relay");
327 MODULE_LICENSE("GPL");
329 static int __init hostaudio_init_module(void)
331 __kernel_param_lock();
332 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
334 __kernel_param_unlock();
336 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
337 if (module_data.dev_audio < 0) {
338 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
342 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
343 if (module_data.dev_mixer < 0) {
344 printk(KERN_ERR "hostmixer: couldn't register mixer "
346 unregister_sound_dsp(module_data.dev_audio);
353 static void __exit hostaudio_cleanup_module (void)
355 unregister_sound_mixer(module_data.dev_mixer);
356 unregister_sound_dsp(module_data.dev_audio);
359 module_init(hostaudio_init_module);
360 module_exit(hostaudio_cleanup_module);