]>
Commit | Line | Data |
---|---|---|
cb8fa61c JD |
1 | /* |
2 | * Copyright (C) 2002 Steve Schmidtke | |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
37185b33 AV |
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> | |
1da177e4 LT |
15 | |
16 | struct hostaudio_state { | |
d471c0fc | 17 | int fd; |
1da177e4 LT |
18 | }; |
19 | ||
20 | struct hostmixer_state { | |
d471c0fc | 21 | int fd; |
1da177e4 LT |
22 | }; |
23 | ||
24 | #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp" | |
25 | #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer" | |
26 | ||
cb8fa61c JD |
27 | /* |
28 | * Changed either at boot time or module load time. At boot, this is | |
b612e475 JD |
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 | ||
e3c6cf61 FT |
43 | module_param(dsp, charp, 0644); |
44 | MODULE_PARM_DESC(dsp, DSP_HELP); | |
45 | module_param(mixer, charp, 0644); | |
46 | MODULE_PARM_DESC(mixer, MIXER_HELP); | |
47 | ||
1da177e4 LT |
48 | #ifndef MODULE |
49 | static int set_dsp(char *name, int *add) | |
50 | { | |
51 | dsp = name; | |
cb8fa61c | 52 | return 0; |
1da177e4 LT |
53 | } |
54 | ||
55 | __uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP); | |
56 | ||
57 | static int set_mixer(char *name, int *add) | |
58 | { | |
59 | mixer = name; | |
cb8fa61c | 60 | return 0; |
1da177e4 LT |
61 | } |
62 | ||
63 | __uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP); | |
1da177e4 LT |
64 | #endif |
65 | ||
9a181c58 AB |
66 | static DEFINE_MUTEX(hostaudio_mutex); |
67 | ||
1da177e4 LT |
68 | /* /dev/dsp file operations */ |
69 | ||
4d338e1a AV |
70 | static ssize_t hostaudio_read(struct file *file, char __user *buffer, |
71 | size_t count, loff_t *ppos) | |
1da177e4 | 72 | { |
d471c0fc | 73 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
74 | void *kbuf; |
75 | int err; | |
76 | ||
77 | #ifdef DEBUG | |
cb8fa61c | 78 | printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count); |
1da177e4 LT |
79 | #endif |
80 | ||
81 | kbuf = kmalloc(count, GFP_KERNEL); | |
cb8fa61c JD |
82 | if (kbuf == NULL) |
83 | return -ENOMEM; | |
1da177e4 | 84 | |
a6ea4cce | 85 | err = os_read_file(state->fd, kbuf, count); |
cb8fa61c | 86 | if (err < 0) |
1da177e4 LT |
87 | goto out; |
88 | ||
cb8fa61c | 89 | if (copy_to_user(buffer, kbuf, err)) |
1da177e4 LT |
90 | err = -EFAULT; |
91 | ||
d471c0fc | 92 | out: |
1da177e4 | 93 | kfree(kbuf); |
cb8fa61c | 94 | return err; |
1da177e4 LT |
95 | } |
96 | ||
4d338e1a | 97 | static ssize_t hostaudio_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
98 | size_t count, loff_t *ppos) |
99 | { | |
d471c0fc | 100 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
101 | void *kbuf; |
102 | int err; | |
103 | ||
104 | #ifdef DEBUG | |
cb8fa61c | 105 | printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count); |
1da177e4 LT |
106 | #endif |
107 | ||
108 | kbuf = kmalloc(count, GFP_KERNEL); | |
cb8fa61c JD |
109 | if (kbuf == NULL) |
110 | return -ENOMEM; | |
1da177e4 LT |
111 | |
112 | err = -EFAULT; | |
cb8fa61c | 113 | if (copy_from_user(kbuf, buffer, count)) |
1da177e4 LT |
114 | goto out; |
115 | ||
a6ea4cce | 116 | err = os_write_file(state->fd, kbuf, count); |
cb8fa61c | 117 | if (err < 0) |
1da177e4 LT |
118 | goto out; |
119 | *ppos += err; | |
120 | ||
121 | out: | |
122 | kfree(kbuf); | |
cb8fa61c | 123 | return err; |
1da177e4 LT |
124 | } |
125 | ||
cb8fa61c | 126 | static unsigned int hostaudio_poll(struct file *file, |
1da177e4 LT |
127 | struct poll_table_struct *wait) |
128 | { | |
d471c0fc | 129 | unsigned int mask = 0; |
1da177e4 LT |
130 | |
131 | #ifdef DEBUG | |
cb8fa61c | 132 | printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); |
1da177e4 LT |
133 | #endif |
134 | ||
cb8fa61c | 135 | return mask; |
1da177e4 LT |
136 | } |
137 | ||
d6c89d9a | 138 | static long hostaudio_ioctl(struct file *file, |
1da177e4 LT |
139 | unsigned int cmd, unsigned long arg) |
140 | { | |
d471c0fc | 141 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
142 | unsigned long data = 0; |
143 | int err; | |
144 | ||
145 | #ifdef DEBUG | |
cb8fa61c | 146 | printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); |
1da177e4 LT |
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: | |
cb8fa61c | 155 | if (get_user(data, (int __user *) arg)) |
484f1e2c | 156 | return -EFAULT; |
1da177e4 LT |
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: | |
cb8fa61c JD |
171 | if (put_user(data, (int __user *) arg)) |
172 | return -EFAULT; | |
1da177e4 LT |
173 | break; |
174 | default: | |
175 | break; | |
176 | } | |
177 | ||
cb8fa61c | 178 | return err; |
1da177e4 LT |
179 | } |
180 | ||
181 | static int hostaudio_open(struct inode *inode, struct file *file) | |
182 | { | |
d471c0fc JD |
183 | struct hostaudio_state *state; |
184 | int r = 0, w = 0; | |
185 | int ret; | |
1da177e4 LT |
186 | |
187 | #ifdef DEBUG | |
d6d1b650 | 188 | kparam_block_sysfs_write(dsp); |
cb8fa61c | 189 | printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); |
d6d1b650 | 190 | kparam_unblock_sysfs_write(dsp); |
1da177e4 LT |
191 | #endif |
192 | ||
d471c0fc | 193 | state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); |
cb8fa61c JD |
194 | if (state == NULL) |
195 | return -ENOMEM; | |
1da177e4 | 196 | |
cb8fa61c JD |
197 | if (file->f_mode & FMODE_READ) |
198 | r = 1; | |
199 | if (file->f_mode & FMODE_WRITE) | |
200 | w = 1; | |
1da177e4 | 201 | |
d6d1b650 | 202 | kparam_block_sysfs_write(dsp); |
9a181c58 | 203 | mutex_lock(&hostaudio_mutex); |
1da177e4 | 204 | ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); |
9a181c58 | 205 | mutex_unlock(&hostaudio_mutex); |
d6d1b650 | 206 | kparam_unblock_sysfs_write(dsp); |
90dc763f | 207 | |
cb8fa61c | 208 | if (ret < 0) { |
1da177e4 | 209 | kfree(state); |
cb8fa61c | 210 | return ret; |
d471c0fc | 211 | } |
1da177e4 | 212 | state->fd = ret; |
d471c0fc | 213 | file->private_data = state; |
cb8fa61c | 214 | return 0; |
1da177e4 LT |
215 | } |
216 | ||
217 | static int hostaudio_release(struct inode *inode, struct file *file) | |
218 | { | |
d471c0fc | 219 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
220 | |
221 | #ifdef DEBUG | |
cb8fa61c | 222 | printk(KERN_DEBUG "hostaudio: release called\n"); |
1da177e4 | 223 | #endif |
d471c0fc JD |
224 | os_close_file(state->fd); |
225 | kfree(state); | |
1da177e4 | 226 | |
cb8fa61c | 227 | return 0; |
1da177e4 LT |
228 | } |
229 | ||
230 | /* /dev/mixer file operations */ | |
231 | ||
d6c89d9a | 232 | static long hostmixer_ioctl_mixdev(struct file *file, |
1da177e4 LT |
233 | unsigned int cmd, unsigned long arg) |
234 | { | |
d471c0fc | 235 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
236 | |
237 | #ifdef DEBUG | |
cb8fa61c | 238 | printk(KERN_DEBUG "hostmixer: ioctl called\n"); |
1da177e4 LT |
239 | #endif |
240 | ||
cb8fa61c | 241 | return os_ioctl_generic(state->fd, cmd, arg); |
1da177e4 LT |
242 | } |
243 | ||
244 | static int hostmixer_open_mixdev(struct inode *inode, struct file *file) | |
245 | { | |
d471c0fc JD |
246 | struct hostmixer_state *state; |
247 | int r = 0, w = 0; | |
248 | int ret; | |
1da177e4 LT |
249 | |
250 | #ifdef DEBUG | |
cb8fa61c | 251 | printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); |
1da177e4 LT |
252 | #endif |
253 | ||
d471c0fc | 254 | state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); |
cb8fa61c JD |
255 | if (state == NULL) |
256 | return -ENOMEM; | |
1da177e4 | 257 | |
cb8fa61c JD |
258 | if (file->f_mode & FMODE_READ) |
259 | r = 1; | |
260 | if (file->f_mode & FMODE_WRITE) | |
261 | w = 1; | |
1da177e4 | 262 | |
d6d1b650 | 263 | kparam_block_sysfs_write(mixer); |
9a181c58 | 264 | mutex_lock(&hostaudio_mutex); |
1da177e4 | 265 | ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); |
9a181c58 | 266 | mutex_unlock(&hostaudio_mutex); |
d6d1b650 | 267 | kparam_unblock_sysfs_write(mixer); |
cb8fa61c JD |
268 | |
269 | if (ret < 0) { | |
d6d1b650 | 270 | kparam_block_sysfs_write(dsp); |
cb8fa61c JD |
271 | printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " |
272 | "err = %d\n", dsp, -ret); | |
d6d1b650 | 273 | kparam_unblock_sysfs_write(dsp); |
1da177e4 | 274 | kfree(state); |
cb8fa61c | 275 | return ret; |
d471c0fc | 276 | } |
1da177e4 | 277 | |
d471c0fc | 278 | file->private_data = state; |
cb8fa61c | 279 | return 0; |
1da177e4 LT |
280 | } |
281 | ||
282 | static int hostmixer_release(struct inode *inode, struct file *file) | |
283 | { | |
d471c0fc | 284 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
285 | |
286 | #ifdef DEBUG | |
cb8fa61c | 287 | printk(KERN_DEBUG "hostmixer: release called\n"); |
1da177e4 LT |
288 | #endif |
289 | ||
d471c0fc JD |
290 | os_close_file(state->fd); |
291 | kfree(state); | |
1da177e4 | 292 | |
cb8fa61c | 293 | return 0; |
1da177e4 LT |
294 | } |
295 | ||
1da177e4 LT |
296 | /* kernel module operations */ |
297 | ||
5e7672ec | 298 | static const struct file_operations hostaudio_fops = { |
d471c0fc JD |
299 | .owner = THIS_MODULE, |
300 | .llseek = no_llseek, | |
301 | .read = hostaudio_read, | |
302 | .write = hostaudio_write, | |
303 | .poll = hostaudio_poll, | |
d6c89d9a | 304 | .unlocked_ioctl = hostaudio_ioctl, |
d471c0fc JD |
305 | .mmap = NULL, |
306 | .open = hostaudio_open, | |
307 | .release = hostaudio_release, | |
1da177e4 LT |
308 | }; |
309 | ||
5e7672ec | 310 | static const struct file_operations hostmixer_fops = { |
d471c0fc JD |
311 | .owner = THIS_MODULE, |
312 | .llseek = no_llseek, | |
d6c89d9a | 313 | .unlocked_ioctl = hostmixer_ioctl_mixdev, |
d471c0fc JD |
314 | .open = hostmixer_open_mixdev, |
315 | .release = hostmixer_release, | |
1da177e4 LT |
316 | }; |
317 | ||
318 | struct { | |
319 | int dev_audio; | |
320 | int dev_mixer; | |
321 | } module_data; | |
322 | ||
323 | MODULE_AUTHOR("Steve Schmidtke"); | |
324 | MODULE_DESCRIPTION("UML Audio Relay"); | |
325 | MODULE_LICENSE("GPL"); | |
326 | ||
327 | static int __init hostaudio_init_module(void) | |
328 | { | |
d6d1b650 | 329 | __kernel_param_lock(); |
d471c0fc | 330 | printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", |
1da177e4 | 331 | dsp, mixer); |
d6d1b650 | 332 | __kernel_param_unlock(); |
1da177e4 LT |
333 | |
334 | module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); | |
cb8fa61c | 335 | if (module_data.dev_audio < 0) { |
d471c0fc JD |
336 | printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); |
337 | return -ENODEV; | |
338 | } | |
1da177e4 LT |
339 | |
340 | module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); | |
cb8fa61c | 341 | if (module_data.dev_mixer < 0) { |
d471c0fc | 342 | printk(KERN_ERR "hostmixer: couldn't register mixer " |
1da177e4 | 343 | "device!\n"); |
d471c0fc JD |
344 | unregister_sound_dsp(module_data.dev_audio); |
345 | return -ENODEV; | |
346 | } | |
1da177e4 | 347 | |
d471c0fc | 348 | return 0; |
1da177e4 LT |
349 | } |
350 | ||
351 | static void __exit hostaudio_cleanup_module (void) | |
352 | { | |
d471c0fc JD |
353 | unregister_sound_mixer(module_data.dev_mixer); |
354 | unregister_sound_dsp(module_data.dev_audio); | |
1da177e4 LT |
355 | } |
356 | ||
357 | module_init(hostaudio_init_module); | |
358 | module_exit(hostaudio_cleanup_module); |