summaryrefslogtreecommitdiffstats
path: root/arch/um/drivers/hostaudio_kern.c
blob: 68142df76608319a666bf455713e54c9c683bb88 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
/*
 * Copyright (C) 2002 Steve Schmidtke
 * Licensed under the GPL
 */

#include "linux/fs.h"
#include "linux/module.h"
#include "linux/slab.h"
#include "linux/sound.h"
#include "linux/soundcard.h"
#include "linux/smp_lock.h"
#include "asm/uaccess.h"
#include "init.h"
#include "os.h"

struct hostaudio_state {
	int fd;
};

struct hostmixer_state {
	int fd;
};

#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
#define HOSTAUDIO_DEV_MIXER "/dev/sound/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" \
"    The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"

#define MIXER_HELP \
"    This is used to specify the host mixer device to the hostaudio driver.\n"\
"    The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"

#ifndef MODULE
static int set_dsp(char *name, int *add)
{
	dsp = name;
	return 0;
}

__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);

static int set_mixer(char *name, int *add)
{
	mixer = name;
	return 0;
}

__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);

#else /*MODULE*/

module_param(dsp, charp, 0644);
MODULE_PARM_DESC(dsp, DSP_HELP);

module_param(mixer, charp, 0644);
MODULE_PARM_DESC(mixer, MIXER_HELP);

#endif

/* /dev/dsp file operations */

static ssize_t hostaudio_read(struct file *file, char __user *buffer,
			      size_t count, loff_t *ppos)
{
	struct hostaudio_state *state = file->private_data;
	void *kbuf;
	int err;

#ifdef DEBUG
	printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count);
#endif

	kbuf = kmalloc(count, GFP_KERNEL);
	if (kbuf == NULL)
		return -ENOMEM;

	err = os_read_file(state->fd, kbuf, count);
	if (err < 0)
		goto out;

	if (copy_to_user(buffer, kbuf, err))
		err = -EFAULT;

out:
	kfree(kbuf);
	return err;
}

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;
	void *kbuf;
	int err;

#ifdef DEBUG
	printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
#endif

	kbuf = kmalloc(count, GFP_KERNEL);
	if (kbuf == NULL)
		return -ENOMEM;

	err = -EFAULT;
	if (copy_from_user(kbuf, buffer, count))
		goto out;

	err = os_write_file(state->fd, kbuf, count);
	if (err < 0)
		goto out;
	*ppos += err;

 out:
	kfree(kbuf);
	return err;
}

static unsigned int hostaudio_poll(struct file *file,
				   struct poll_table_struct *wait)
{
	unsigned int mask = 0;

#ifdef DEBUG
	printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
#endif

	return mask;
}

static long hostaudio_ioctl(struct file *file,
			   unsigned int cmd, unsigned long arg)
{
	struct hostaudio_state *state = file->private_data;
	unsigned long data = 0;
	int err;

#ifdef DEBUG
	printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd);
#endif
	switch(cmd){
	case SNDCTL_DSP_SPEED:
	case SNDCTL_DSP_STEREO:
	case SNDCTL_DSP_GETBLKSIZE:
	case SNDCTL_DSP_CHANNELS:
	case SNDCTL_DSP_SUBDIVIDE:
	case SNDCTL_DSP_SETFRAGMENT:
		if (get_user(data, (int __user *) arg))
			return -EFAULT;
		break;
	default:
		break;
	}

	err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);

	switch(cmd){
	case SNDCTL_DSP_SPEED:
	case SNDCTL_DSP_STEREO:
	case SNDCTL_DSP_GETBLKSIZE:
	case SNDCTL_DSP_CHANNELS:
	case SNDCTL_DSP_SUBDIVIDE:
	case SNDCTL_DSP_SETFRAGMENT:
		if (put_user(data, (int __user *) arg))
			return -EFAULT;
		break;
	default:
		break;
	}

	return err;
}

static int hostaudio_open(struct inode *inode, struct file *file)
{
	struct hostaudio_state *state;
	int r = 0, w = 0;
	int ret;

#ifdef DEBUG
	printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
#endif

	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;

	lock_kernel();
	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
	unlock_kernel();

	if (ret < 0) {
		kfree(state);
		return ret;
	}
	state->fd = ret;
	file->private_data = state;
	return 0;
}

static int hostaudio_release(struct inode *inode, struct file *file)
{
	struct hostaudio_state *state = file->private_data;

#ifdef DEBUG
	printk(KERN_DEBUG "hostaudio: release called\n");
#endif
	os_close_file(state->fd);
	kfree(state);

	return 0;
}

/* /dev/mixer file operations */

static long hostmixer_ioctl_mixdev(struct file *file,
				  unsigned int cmd, unsigned long arg)
{
	struct hostmixer_state *state = file->private_data;

#ifdef DEBUG
	printk(KERN_DEBUG "hostmixer: ioctl called\n");
#endif

	return os_ioctl_generic(state->fd, cmd, arg);
}

static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
{
	struct hostmixer_state *state;
	int r = 0, w = 0;
	int ret;

#ifdef DEBUG
	printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer);
#endif

	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;

	lock_kernel();
	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
	unlock_kernel();

	if (ret < 0) {
		printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
		       "err = %d\n", dsp, -ret);
		kfree(state);
		return ret;
	}

	file->private_data = state;
	return 0;
}

static int hostmixer_release(struct inode *inode, struct file *file)
{
	struct hostmixer_state *state = file->private_data;

#ifdef DEBUG
	printk(KERN_DEBUG "hostmixer: release called\n");
#endif

	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,
	.unlocked_ioctl	= hostaudio_ioctl,
	.mmap           = NULL,
	.open           = hostaudio_open,
	.release        = hostaudio_release,
};

static const struct file_operations hostmixer_fops = {
	.owner          = THIS_MODULE,
	.llseek         = no_llseek,
	.unlocked_ioctl	= hostmixer_ioctl_mixdev,
	.open           = hostmixer_open_mixdev,
	.release        = hostmixer_release,
};

struct {
	int dev_audio;
	int dev_mixer;
} module_data;

MODULE_AUTHOR("Steve Schmidtke");
MODULE_DESCRIPTION("UML Audio Relay");
MODULE_LICENSE("GPL");

static int __init hostaudio_init_module(void)
{
	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;
	}

	module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
	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;
	}

	return 0;
}

static void __exit hostaudio_cleanup_module (void)
{
	unregister_sound_mixer(module_data.dev_mixer);
	unregister_sound_dsp(module_data.dev_audio);
}

module_init(hostaudio_init_module);
module_exit(hostaudio_cleanup_module);