tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2002 Steve Schmidtke
3 * Licensed under the GPL
4 */
5
6#include "linux/config.h"
7#include "linux/module.h"
8#include "linux/init.h"
9#include "linux/slab.h"
10#include "linux/fs.h"
11#include "linux/sound.h"
12#include "linux/soundcard.h"
13#include "asm/uaccess.h"
14#include "kern_util.h"
15#include "init.h"
16#include "os.h"
17
18struct hostaudio_state {
19 int fd;
20};
21
22struct hostmixer_state {
23 int fd;
24};
25
26#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
27#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
28
29/* Only changed from linux_main at boot time */
30char *dsp = HOSTAUDIO_DEV_DSP;
31char *mixer = HOSTAUDIO_DEV_MIXER;
32
33#define DSP_HELP \
34" This is used to specify the host dsp device to the hostaudio driver.\n" \
35" The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
36
37#define MIXER_HELP \
38" This is used to specify the host mixer device to the hostaudio driver.\n"\
39" The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
40
41#ifndef MODULE
42static int set_dsp(char *name, int *add)
43{
44 dsp = name;
45 return(0);
46}
47
48__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
49
50static int set_mixer(char *name, int *add)
51{
52 mixer = name;
53 return(0);
54}
55
56__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
57
58#else /*MODULE*/
59
60module_param(dsp, charp, 0644);
61MODULE_PARM_DESC(dsp, DSP_HELP);
62
63module_param(mixer, charp, 0644);
64MODULE_PARM_DESC(mixer, MIXER_HELP);
65
66#endif
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("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
92 out:
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("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("hostaudio: poll called (unimplemented)\n");
133#endif
134
135 return(mask);
136}
137
138static int hostaudio_ioctl(struct inode *inode, 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("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 printk("hostaudio: open called (host: %s)\n", dsp);
189#endif
190
191 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
192 if(state == NULL)
193 return(-ENOMEM);
194
195 if(file->f_mode & FMODE_READ) r = 1;
196 if(file->f_mode & FMODE_WRITE) w = 1;
197
198 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
199 if(ret < 0){
200 kfree(state);
201 return(ret);
202 }
203
204 state->fd = ret;
205 file->private_data = state;
206 return(0);
207}
208
209static int hostaudio_release(struct inode *inode, struct file *file)
210{
211 struct hostaudio_state *state = file->private_data;
212
213#ifdef DEBUG
214 printk("hostaudio: release called\n");
215#endif
216
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
281/* kernel module operations */
282
283static struct file_operations hostaudio_fops = {
284 .owner = THIS_MODULE,
285 .llseek = no_llseek,
286 .read = hostaudio_read,
287 .write = hostaudio_write,
288 .poll = hostaudio_poll,
289 .ioctl = hostaudio_ioctl,
290 .mmap = NULL,
291 .open = hostaudio_open,
292 .release = hostaudio_release,
293};
294
295static struct file_operations hostmixer_fops = {
296 .owner = THIS_MODULE,
297 .llseek = no_llseek,
298 .ioctl = hostmixer_ioctl_mixdev,
299 .open = hostmixer_open_mixdev,
300 .release = hostmixer_release,
301};
302
303struct {
304 int dev_audio;
305 int dev_mixer;
306} module_data;
307
308MODULE_AUTHOR("Steve Schmidtke");
309MODULE_DESCRIPTION("UML Audio Relay");
310MODULE_LICENSE("GPL");
311
312static int __init hostaudio_init_module(void)
313{
314 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
315 dsp, mixer);
316
317 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
318 if(module_data.dev_audio < 0){
319 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
320 return -ENODEV;
321 }
322
323 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
324 if(module_data.dev_mixer < 0){
325 printk(KERN_ERR "hostmixer: couldn't register mixer "
326 "device!\n");
327 unregister_sound_dsp(module_data.dev_audio);
328 return -ENODEV;
329 }
330
331 return 0;
332}
333
334static void __exit hostaudio_cleanup_module (void)
335{
336 unregister_sound_mixer(module_data.dev_mixer);
337 unregister_sound_dsp(module_data.dev_audio);
338}
339
340module_init(hostaudio_init_module);
341module_exit(hostaudio_cleanup_module);
342
343/*
344 * Overrides for Emacs so that we follow Linus's tabbing style.
345 * Emacs will notice this stuff at the end of the file and automatically
346 * adjust the settings for this buffer only. This must remain at the end
347 * of the file.
348 * ---------------------------------------------------------------------------
349 * Local variables:
350 * c-file-style: "linux"
351 * End:
352 */