1/*
2 * Copyright (C) 2002 Steve Schmidtke
3 * Licensed under the GPL
4 */
5
6#include "linux/module.h"
7#include "linux/init.h"
8#include "linux/slab.h"
9#include "linux/fs.h"
10#include "linux/sound.h"
11#include "linux/soundcard.h"
12#include "asm/uaccess.h"
13#include "kern_util.h"
14#include "init.h"
15#include "os.h"
16
17struct hostaudio_state {
18	int fd;
19};
20
21struct hostmixer_state {
22	int fd;
23};
24
25#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
26#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
27
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.
31 */
32static char *dsp = HOSTAUDIO_DEV_DSP;
33static char *mixer = HOSTAUDIO_DEV_MIXER;
34
35#define DSP_HELP \
36"    This is used to specify the host dsp device to the hostaudio driver.\n" \
37"    The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
38
39#define MIXER_HELP \
40"    This is used to specify the host mixer device to the hostaudio driver.\n"\
41"    The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
42
43#ifndef MODULE
44static int set_dsp(char *name, int *add)
45{
46	dsp = name;
47	return(0);
48}
49
50__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
51
52static int set_mixer(char *name, int *add)
53{
54	mixer = name;
55	return(0);
56}
57
58__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
59
60#else /*MODULE*/
61
62module_param(dsp, charp, 0644);
63MODULE_PARM_DESC(dsp, DSP_HELP);
64
65module_param(mixer, charp, 0644);
66MODULE_PARM_DESC(mixer, MIXER_HELP);
67
68#endif
69
70/* /dev/dsp file operations */
71
72static ssize_t hostaudio_read(struct file *file, char __user *buffer,
73			      size_t count, loff_t *ppos)
74{
75	struct hostaudio_state *state = file->private_data;
76	void *kbuf;
77	int err;
78
79#ifdef DEBUG
80	printk("hostaudio: read called, count = %d\n", count);
81#endif
82
83	kbuf = kmalloc(count, GFP_KERNEL);
84	if(kbuf == NULL)
85		return(-ENOMEM);
86
87	err = os_read_file(state->fd, kbuf, count);
88	if(err < 0)
89		goto out;
90
91	if(copy_to_user(buffer, kbuf, err))
92		err = -EFAULT;
93
94out:
95	kfree(kbuf);
96	return(err);
97}
98
99static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
100			       size_t count, loff_t *ppos)
101{
102	struct hostaudio_state *state = file->private_data;
103	void *kbuf;
104	int err;
105
106#ifdef DEBUG
107	printk("hostaudio: write called, count = %d\n", count);
108#endif
109
110	kbuf = kmalloc(count, GFP_KERNEL);
111	if(kbuf == NULL)
112		return(-ENOMEM);
113
114	err = -EFAULT;
115	if(copy_from_user(kbuf, buffer, count))
116		goto out;
117
118	err = os_write_file(state->fd, kbuf, count);
119	if(err < 0)
120		goto out;
121	*ppos += err;
122
123 out:
124	kfree(kbuf);
125	return(err);
126}
127
128static unsigned int hostaudio_poll(struct file *file,
129				   struct poll_table_struct *wait)
130{
131	unsigned int mask = 0;
132
133#ifdef DEBUG
134	printk("hostaudio: poll called (unimplemented)\n");
135#endif
136
137	return(mask);
138}
139
140static int hostaudio_ioctl(struct inode *inode, struct file *file,
141			   unsigned int cmd, unsigned long arg)
142{
143	struct hostaudio_state *state = file->private_data;
144	unsigned long data = 0;
145	int err;
146
147#ifdef DEBUG
148	printk("hostaudio: ioctl called, cmd = %u\n", cmd);
149#endif
150	switch(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))
158			return(-EFAULT);
159		break;
160	default:
161		break;
162	}
163
164	err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
165
166	switch(cmd){
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))
174			return(-EFAULT);
175		break;
176	default:
177		break;
178	}
179
180	return(err);
181}
182
183static int hostaudio_open(struct inode *inode, struct file *file)
184{
185	struct hostaudio_state *state;
186	int r = 0, w = 0;
187	int ret;
188
189#ifdef DEBUG
190	printk("hostaudio: open called (host: %s)\n", dsp);
191#endif
192
193	state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
194	if(state == NULL)
195		return(-ENOMEM);
196
197	if(file->f_mode & FMODE_READ) r = 1;
198	if(file->f_mode & FMODE_WRITE) w = 1;
199
200	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
201	if(ret < 0){
202		kfree(state);
203		return(ret);
204	}
205	state->fd = ret;
206	file->private_data = state;
207	return(0);
208}
209
210static int hostaudio_release(struct inode *inode, struct file *file)
211{
212	struct hostaudio_state *state = file->private_data;
213
214#ifdef DEBUG
215	printk("hostaudio: release called\n");
216#endif
217	os_close_file(state->fd);
218	kfree(state);
219
220	return(0);
221}
222
223/* /dev/mixer file operations */
224
225static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file,
226				  unsigned int cmd, unsigned long arg)
227{
228	struct hostmixer_state *state = file->private_data;
229
230#ifdef DEBUG
231	printk("hostmixer: ioctl called\n");
232#endif
233
234	return(os_ioctl_generic(state->fd, cmd, arg));
235}
236
237static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
238{
239	struct hostmixer_state *state;
240	int r = 0, w = 0;
241	int ret;
242
243#ifdef DEBUG
244	printk("hostmixer: open called (host: %s)\n", mixer);
245#endif
246
247	state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
248	if(state == NULL) return(-ENOMEM);
249
250	if(file->f_mode & FMODE_READ) r = 1;
251	if(file->f_mode & FMODE_WRITE) w = 1;
252
253	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
254
255	if(ret < 0){
256		printk("hostaudio_open_mixdev failed to open '%s', err = %d\n",
257		       dsp, -ret);
258		kfree(state);
259		return(ret);
260	}
261
262	file->private_data = state;
263	return(0);
264}
265
266static int hostmixer_release(struct inode *inode, struct file *file)
267{
268	struct hostmixer_state *state = file->private_data;
269
270#ifdef DEBUG
271	printk("hostmixer: release called\n");
272#endif
273
274	os_close_file(state->fd);
275	kfree(state);
276
277	return(0);
278}
279
280/* kernel module operations */
281
282static const struct file_operations hostaudio_fops = {
283	.owner          = THIS_MODULE,
284	.llseek         = no_llseek,
285	.read           = hostaudio_read,
286	.write          = hostaudio_write,
287	.poll           = hostaudio_poll,
288	.ioctl          = hostaudio_ioctl,
289	.mmap           = NULL,
290	.open           = hostaudio_open,
291	.release        = hostaudio_release,
292};
293
294static const struct file_operations hostmixer_fops = {
295	.owner          = THIS_MODULE,
296	.llseek         = no_llseek,
297	.ioctl          = hostmixer_ioctl_mixdev,
298	.open           = hostmixer_open_mixdev,
299	.release        = hostmixer_release,
300};
301
302struct {
303	int dev_audio;
304	int dev_mixer;
305} module_data;
306
307MODULE_AUTHOR("Steve Schmidtke");
308MODULE_DESCRIPTION("UML Audio Relay");
309MODULE_LICENSE("GPL");
310
311static int __init hostaudio_init_module(void)
312{
313	printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
314	       dsp, mixer);
315
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");
319		return -ENODEV;
320	}
321
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 "
325		       "device!\n");
326		unregister_sound_dsp(module_data.dev_audio);
327		return -ENODEV;
328	}
329
330	return 0;
331}
332
333static void __exit hostaudio_cleanup_module (void)
334{
335	unregister_sound_mixer(module_data.dev_mixer);
336	unregister_sound_dsp(module_data.dev_audio);
337}
338
339module_init(hostaudio_init_module);
340module_exit(hostaudio_cleanup_module);
341