1/*
2 * Copyright (C) 2002 Steve Schmidtke
3 * Licensed under the GPL
4 */
5
6#include "linux/fs.h"
7#include "linux/module.h"
8#include "linux/slab.h"
9#include "linux/sound.h"
10#include "linux/soundcard.h"
11#include "linux/mutex.h"
12#include "asm/uaccess.h"
13#include "init.h"
14#include "os.h"
15
16struct hostaudio_state {
17	int fd;
18};
19
20struct hostmixer_state {
21	int fd;
22};
23
24#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
25#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
26
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
43module_param(dsp, charp, 0644);
44MODULE_PARM_DESC(dsp, DSP_HELP);
45module_param(mixer, charp, 0644);
46MODULE_PARM_DESC(mixer, MIXER_HELP);
47
48#ifndef MODULE
49static int set_dsp(char *name, int *add)
50{
51	dsp = name;
52	return 0;
53}
54
55__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
56
57static int set_mixer(char *name, int *add)
58{
59	mixer = name;
60	return 0;
61}
62
63__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
64#endif
65
66static DEFINE_MUTEX(hostaudio_mutex);
67
68/* /dev/dsp file operations */
69
70static ssize_t hostaudio_read(struct file *file, char __user *buffer,
71			      size_t count, loff_t *ppos)
72{
73	struct hostaudio_state *state = file->private_data;
74	void *kbuf;
75	int err;
76
77#ifdef DEBUG
78	printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count);
79#endif
80
81	kbuf = kmalloc(count, GFP_KERNEL);
82	if (kbuf == NULL)
83		return -ENOMEM;
84
85	err = os_read_file(state->fd, kbuf, count);
86	if (err < 0)
87		goto out;
88
89	if (copy_to_user(buffer, kbuf, err))
90		err = -EFAULT;
91
92out:
93	kfree(kbuf);
94	return err;
95}
96
97static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
98			       size_t count, loff_t *ppos)
99{
100	struct hostaudio_state *state = file->private_data;
101	void *kbuf;
102	int err;
103
104#ifdef DEBUG
105	printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
106#endif
107
108	kbuf = kmalloc(count, GFP_KERNEL);
109	if (kbuf == NULL)
110		return -ENOMEM;
111
112	err = -EFAULT;
113	if (copy_from_user(kbuf, buffer, count))
114		goto out;
115
116	err = os_write_file(state->fd, kbuf, count);
117	if (err < 0)
118		goto out;
119	*ppos += err;
120
121 out:
122	kfree(kbuf);
123	return err;
124}
125
126static unsigned int hostaudio_poll(struct file *file,
127				   struct poll_table_struct *wait)
128{
129	unsigned int mask = 0;
130
131#ifdef DEBUG
132	printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
133#endif
134
135	return mask;
136}
137
138static long hostaudio_ioctl(struct file *file,
139			   unsigned int cmd, unsigned long arg)
140{
141	struct hostaudio_state *state = file->private_data;
142	unsigned long data = 0;
143	int err;
144
145#ifdef DEBUG
146	printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd);
147#endif
148	switch(cmd){
149	case SNDCTL_DSP_SPEED:
150	case SNDCTL_DSP_STEREO:
151	case SNDCTL_DSP_GETBLKSIZE:
152	case SNDCTL_DSP_CHANNELS:
153	case SNDCTL_DSP_SUBDIVIDE:
154	case SNDCTL_DSP_SETFRAGMENT:
155		if (get_user(data, (int __user *) arg))
156			return -EFAULT;
157		break;
158	default:
159		break;
160	}
161
162	err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
163
164	switch(cmd){
165	case SNDCTL_DSP_SPEED:
166	case SNDCTL_DSP_STEREO:
167	case SNDCTL_DSP_GETBLKSIZE:
168	case SNDCTL_DSP_CHANNELS:
169	case SNDCTL_DSP_SUBDIVIDE:
170	case SNDCTL_DSP_SETFRAGMENT:
171		if (put_user(data, (int __user *) arg))
172			return -EFAULT;
173		break;
174	default:
175		break;
176	}
177
178	return err;
179}
180
181static int hostaudio_open(struct inode *inode, struct file *file)
182{
183	struct hostaudio_state *state;
184	int r = 0, w = 0;
185	int ret;
186
187#ifdef DEBUG
188	kparam_block_sysfs_write(dsp);
189	printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
190	kparam_unblock_sysfs_write(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)
198		r = 1;
199	if (file->f_mode & FMODE_WRITE)
200		w = 1;
201
202	kparam_block_sysfs_write(dsp);
203	mutex_lock(&hostaudio_mutex);
204	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
205	mutex_unlock(&hostaudio_mutex);
206	kparam_unblock_sysfs_write(dsp);
207
208	if (ret < 0) {
209		kfree(state);
210		return ret;
211	}
212	state->fd = ret;
213	file->private_data = state;
214	return 0;
215}
216
217static int hostaudio_release(struct inode *inode, struct file *file)
218{
219	struct hostaudio_state *state = file->private_data;
220
221#ifdef DEBUG
222	printk(KERN_DEBUG "hostaudio: release called\n");
223#endif
224	os_close_file(state->fd);
225	kfree(state);
226
227	return 0;
228}
229
230/* /dev/mixer file operations */
231
232static long hostmixer_ioctl_mixdev(struct file *file,
233				  unsigned int cmd, unsigned long arg)
234{
235	struct hostmixer_state *state = file->private_data;
236
237#ifdef DEBUG
238	printk(KERN_DEBUG "hostmixer: ioctl called\n");
239#endif
240
241	return os_ioctl_generic(state->fd, cmd, arg);
242}
243
244static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
245{
246	struct hostmixer_state *state;
247	int r = 0, w = 0;
248	int ret;
249
250#ifdef DEBUG
251	printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer);
252#endif
253
254	state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
255	if (state == NULL)
256		return -ENOMEM;
257
258	if (file->f_mode & FMODE_READ)
259		r = 1;
260	if (file->f_mode & FMODE_WRITE)
261		w = 1;
262
263	kparam_block_sysfs_write(mixer);
264	mutex_lock(&hostaudio_mutex);
265	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
266	mutex_unlock(&hostaudio_mutex);
267	kparam_unblock_sysfs_write(mixer);
268
269	if (ret < 0) {
270		kparam_block_sysfs_write(dsp);
271		printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
272		       "err = %d\n", dsp, -ret);
273		kparam_unblock_sysfs_write(dsp);
274		kfree(state);
275		return ret;
276	}
277
278	file->private_data = state;
279	return 0;
280}
281
282static int hostmixer_release(struct inode *inode, struct file *file)
283{
284	struct hostmixer_state *state = file->private_data;
285
286#ifdef DEBUG
287	printk(KERN_DEBUG "hostmixer: release called\n");
288#endif
289
290	os_close_file(state->fd);
291	kfree(state);
292
293	return 0;
294}
295
296/* kernel module operations */
297
298static const struct file_operations hostaudio_fops = {
299	.owner          = THIS_MODULE,
300	.llseek         = no_llseek,
301	.read           = hostaudio_read,
302	.write          = hostaudio_write,
303	.poll           = hostaudio_poll,
304	.unlocked_ioctl	= hostaudio_ioctl,
305	.mmap           = NULL,
306	.open           = hostaudio_open,
307	.release        = hostaudio_release,
308};
309
310static const struct file_operations hostmixer_fops = {
311	.owner          = THIS_MODULE,
312	.llseek         = no_llseek,
313	.unlocked_ioctl	= hostmixer_ioctl_mixdev,
314	.open           = hostmixer_open_mixdev,
315	.release        = hostmixer_release,
316};
317
318struct {
319	int dev_audio;
320	int dev_mixer;
321} module_data;
322
323MODULE_AUTHOR("Steve Schmidtke");
324MODULE_DESCRIPTION("UML Audio Relay");
325MODULE_LICENSE("GPL");
326
327static int __init hostaudio_init_module(void)
328{
329	__kernel_param_lock();
330	printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
331	       dsp, mixer);
332	__kernel_param_unlock();
333
334	module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
335	if (module_data.dev_audio < 0) {
336		printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
337		return -ENODEV;
338	}
339
340	module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
341	if (module_data.dev_mixer < 0) {
342		printk(KERN_ERR "hostmixer: couldn't register mixer "
343		       "device!\n");
344		unregister_sound_dsp(module_data.dev_audio);
345		return -ENODEV;
346	}
347
348	return 0;
349}
350
351static void __exit hostaudio_cleanup_module (void)
352{
353	unregister_sound_mixer(module_data.dev_mixer);
354	unregister_sound_dsp(module_data.dev_audio);
355}
356
357module_init(hostaudio_init_module);
358module_exit(hostaudio_cleanup_module);
359