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1da177e4 LT |
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 | ||
18 | struct hostaudio_state { | |
19 | int fd; | |
20 | }; | |
21 | ||
22 | struct 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 */ | |
30 | char *dsp = HOSTAUDIO_DEV_DSP; | |
31 | char *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 | |
42 | static 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 | ||
50 | static 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 | ||
60 | MODULE_PARM(dsp, "s"); | |
61 | MODULE_PARM_DESC(dsp, DSP_HELP); | |
62 | ||
63 | MODULE_PARM(mixer, "s"); | |
64 | MODULE_PARM_DESC(mixer, MIXER_HELP); | |
65 | ||
66 | #endif | |
67 | ||
68 | /* /dev/dsp file operations */ | |
69 | ||
70 | static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count, | |
71 | 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 | ||
97 | static ssize_t hostaudio_write(struct file *file, const char *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 | ||
126 | static 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 | ||
138 | static 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 *) 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 *) arg)) | |
172 | return(-EFAULT); | |
173 | break; | |
174 | default: | |
175 | break; | |
176 | } | |
177 | ||
178 | return(err); | |
179 | } | |
180 | ||
181 | static 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 | ||
209 | static 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 | ||
225 | static 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 | ||
237 | static 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 | ||
266 | static 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 | ||
283 | static 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 | ||
295 | static 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 | ||
303 | struct { | |
304 | int dev_audio; | |
305 | int dev_mixer; | |
306 | } module_data; | |
307 | ||
308 | MODULE_AUTHOR("Steve Schmidtke"); | |
309 | MODULE_DESCRIPTION("UML Audio Relay"); | |
310 | MODULE_LICENSE("GPL"); | |
311 | ||
312 | static 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 | ||
334 | static 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 | ||
340 | module_init(hostaudio_init_module); | |
341 | module_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 | */ |