Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002 Steve Schmidtke | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
1da177e4 LT |
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 | ||
17 | struct hostaudio_state { | |
d471c0fc | 18 | int fd; |
1da177e4 LT |
19 | }; |
20 | ||
21 | struct hostmixer_state { | |
d471c0fc | 22 | int fd; |
1da177e4 LT |
23 | }; |
24 | ||
25 | #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp" | |
26 | #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer" | |
27 | ||
b612e475 JD |
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 | */ | |
32 | static char *dsp = HOSTAUDIO_DEV_DSP; | |
33 | static char *mixer = HOSTAUDIO_DEV_MIXER; | |
1da177e4 LT |
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 | |
44 | static 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 | ||
52 | static 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 | ||
20a64f1d | 62 | module_param(dsp, charp, 0644); |
1da177e4 LT |
63 | MODULE_PARM_DESC(dsp, DSP_HELP); |
64 | ||
20a64f1d | 65 | module_param(mixer, charp, 0644); |
1da177e4 LT |
66 | MODULE_PARM_DESC(mixer, MIXER_HELP); |
67 | ||
68 | #endif | |
69 | ||
70 | /* /dev/dsp file operations */ | |
71 | ||
4d338e1a AV |
72 | static ssize_t hostaudio_read(struct file *file, char __user *buffer, |
73 | size_t count, loff_t *ppos) | |
1da177e4 | 74 | { |
d471c0fc | 75 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
76 | void *kbuf; |
77 | int err; | |
78 | ||
79 | #ifdef DEBUG | |
d471c0fc | 80 | printk("hostaudio: read called, count = %d\n", count); |
1da177e4 LT |
81 | #endif |
82 | ||
83 | kbuf = kmalloc(count, GFP_KERNEL); | |
84 | if(kbuf == NULL) | |
85 | return(-ENOMEM); | |
86 | ||
3d564047 | 87 | err = os_read_file_k(state->fd, kbuf, count); |
1da177e4 LT |
88 | if(err < 0) |
89 | goto out; | |
90 | ||
91 | if(copy_to_user(buffer, kbuf, err)) | |
92 | err = -EFAULT; | |
93 | ||
d471c0fc | 94 | out: |
1da177e4 LT |
95 | kfree(kbuf); |
96 | return(err); | |
97 | } | |
98 | ||
4d338e1a | 99 | static ssize_t hostaudio_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
100 | size_t count, loff_t *ppos) |
101 | { | |
d471c0fc | 102 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
103 | void *kbuf; |
104 | int err; | |
105 | ||
106 | #ifdef DEBUG | |
d471c0fc | 107 | printk("hostaudio: write called, count = %d\n", count); |
1da177e4 LT |
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 | ||
3d564047 | 118 | err = os_write_file_k(state->fd, kbuf, count); |
1da177e4 LT |
119 | if(err < 0) |
120 | goto out; | |
121 | *ppos += err; | |
122 | ||
123 | out: | |
124 | kfree(kbuf); | |
125 | return(err); | |
126 | } | |
127 | ||
128 | static unsigned int hostaudio_poll(struct file *file, | |
129 | struct poll_table_struct *wait) | |
130 | { | |
d471c0fc | 131 | unsigned int mask = 0; |
1da177e4 LT |
132 | |
133 | #ifdef DEBUG | |
d471c0fc | 134 | printk("hostaudio: poll called (unimplemented)\n"); |
1da177e4 LT |
135 | #endif |
136 | ||
d471c0fc | 137 | return(mask); |
1da177e4 LT |
138 | } |
139 | ||
140 | static int hostaudio_ioctl(struct inode *inode, struct file *file, | |
141 | unsigned int cmd, unsigned long arg) | |
142 | { | |
d471c0fc | 143 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
144 | unsigned long data = 0; |
145 | int err; | |
146 | ||
147 | #ifdef DEBUG | |
d471c0fc | 148 | printk("hostaudio: ioctl called, cmd = %u\n", cmd); |
1da177e4 LT |
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: | |
4d338e1a | 157 | if(get_user(data, (int __user *) arg)) |
1da177e4 LT |
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: | |
4d338e1a | 173 | if(put_user(data, (int __user *) arg)) |
1da177e4 LT |
174 | return(-EFAULT); |
175 | break; | |
176 | default: | |
177 | break; | |
178 | } | |
179 | ||
180 | return(err); | |
181 | } | |
182 | ||
183 | static int hostaudio_open(struct inode *inode, struct file *file) | |
184 | { | |
d471c0fc JD |
185 | struct hostaudio_state *state; |
186 | int r = 0, w = 0; | |
187 | int ret; | |
1da177e4 LT |
188 | |
189 | #ifdef DEBUG | |
d471c0fc | 190 | printk("hostaudio: open called (host: %s)\n", dsp); |
1da177e4 LT |
191 | #endif |
192 | ||
d471c0fc JD |
193 | state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); |
194 | if(state == NULL) | |
1da177e4 LT |
195 | return(-ENOMEM); |
196 | ||
d471c0fc JD |
197 | if(file->f_mode & FMODE_READ) r = 1; |
198 | if(file->f_mode & FMODE_WRITE) w = 1; | |
1da177e4 LT |
199 | |
200 | ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); | |
d471c0fc | 201 | if(ret < 0){ |
1da177e4 LT |
202 | kfree(state); |
203 | return(ret); | |
d471c0fc | 204 | } |
1da177e4 | 205 | state->fd = ret; |
d471c0fc JD |
206 | file->private_data = state; |
207 | return(0); | |
1da177e4 LT |
208 | } |
209 | ||
210 | static int hostaudio_release(struct inode *inode, struct file *file) | |
211 | { | |
d471c0fc | 212 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
213 | |
214 | #ifdef DEBUG | |
d471c0fc | 215 | printk("hostaudio: release called\n"); |
1da177e4 | 216 | #endif |
d471c0fc JD |
217 | os_close_file(state->fd); |
218 | kfree(state); | |
1da177e4 LT |
219 | |
220 | return(0); | |
221 | } | |
222 | ||
223 | /* /dev/mixer file operations */ | |
224 | ||
225 | static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file, | |
226 | unsigned int cmd, unsigned long arg) | |
227 | { | |
d471c0fc | 228 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
229 | |
230 | #ifdef DEBUG | |
d471c0fc | 231 | printk("hostmixer: ioctl called\n"); |
1da177e4 LT |
232 | #endif |
233 | ||
234 | return(os_ioctl_generic(state->fd, cmd, arg)); | |
235 | } | |
236 | ||
237 | static int hostmixer_open_mixdev(struct inode *inode, struct file *file) | |
238 | { | |
d471c0fc JD |
239 | struct hostmixer_state *state; |
240 | int r = 0, w = 0; | |
241 | int ret; | |
1da177e4 LT |
242 | |
243 | #ifdef DEBUG | |
d471c0fc | 244 | printk("hostmixer: open called (host: %s)\n", mixer); |
1da177e4 LT |
245 | #endif |
246 | ||
d471c0fc JD |
247 | state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); |
248 | if(state == NULL) return(-ENOMEM); | |
1da177e4 | 249 | |
d471c0fc JD |
250 | if(file->f_mode & FMODE_READ) r = 1; |
251 | if(file->f_mode & FMODE_WRITE) w = 1; | |
1da177e4 LT |
252 | |
253 | ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); | |
254 | ||
d471c0fc | 255 | if(ret < 0){ |
1da177e4 LT |
256 | printk("hostaudio_open_mixdev failed to open '%s', err = %d\n", |
257 | dsp, -ret); | |
258 | kfree(state); | |
259 | return(ret); | |
d471c0fc | 260 | } |
1da177e4 | 261 | |
d471c0fc JD |
262 | file->private_data = state; |
263 | return(0); | |
1da177e4 LT |
264 | } |
265 | ||
266 | static int hostmixer_release(struct inode *inode, struct file *file) | |
267 | { | |
d471c0fc | 268 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
269 | |
270 | #ifdef DEBUG | |
d471c0fc | 271 | printk("hostmixer: release called\n"); |
1da177e4 LT |
272 | #endif |
273 | ||
d471c0fc JD |
274 | os_close_file(state->fd); |
275 | kfree(state); | |
1da177e4 LT |
276 | |
277 | return(0); | |
278 | } | |
279 | ||
1da177e4 LT |
280 | /* kernel module operations */ |
281 | ||
5e7672ec | 282 | static const struct file_operations hostaudio_fops = { |
d471c0fc JD |
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, | |
1da177e4 LT |
292 | }; |
293 | ||
5e7672ec | 294 | static const struct file_operations hostmixer_fops = { |
d471c0fc JD |
295 | .owner = THIS_MODULE, |
296 | .llseek = no_llseek, | |
297 | .ioctl = hostmixer_ioctl_mixdev, | |
298 | .open = hostmixer_open_mixdev, | |
299 | .release = hostmixer_release, | |
1da177e4 LT |
300 | }; |
301 | ||
302 | struct { | |
303 | int dev_audio; | |
304 | int dev_mixer; | |
305 | } module_data; | |
306 | ||
307 | MODULE_AUTHOR("Steve Schmidtke"); | |
308 | MODULE_DESCRIPTION("UML Audio Relay"); | |
309 | MODULE_LICENSE("GPL"); | |
310 | ||
311 | static int __init hostaudio_init_module(void) | |
312 | { | |
d471c0fc | 313 | printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", |
1da177e4 LT |
314 | dsp, mixer); |
315 | ||
316 | module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); | |
d471c0fc JD |
317 | if(module_data.dev_audio < 0){ |
318 | printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); | |
319 | return -ENODEV; | |
320 | } | |
1da177e4 LT |
321 | |
322 | module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); | |
d471c0fc JD |
323 | if(module_data.dev_mixer < 0){ |
324 | printk(KERN_ERR "hostmixer: couldn't register mixer " | |
1da177e4 | 325 | "device!\n"); |
d471c0fc JD |
326 | unregister_sound_dsp(module_data.dev_audio); |
327 | return -ENODEV; | |
328 | } | |
1da177e4 | 329 | |
d471c0fc | 330 | return 0; |
1da177e4 LT |
331 | } |
332 | ||
333 | static void __exit hostaudio_cleanup_module (void) | |
334 | { | |
d471c0fc JD |
335 | unregister_sound_mixer(module_data.dev_mixer); |
336 | unregister_sound_dsp(module_data.dev_audio); | |
1da177e4 LT |
337 | } |
338 | ||
339 | module_init(hostaudio_init_module); | |
340 | module_exit(hostaudio_cleanup_module); |