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Commit | Line | Data |
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cb8fa61c JD |
1 | /* |
2 | * Copyright (C) 2002 Steve Schmidtke | |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
cb8fa61c | 6 | #include "linux/fs.h" |
1da177e4 | 7 | #include "linux/module.h" |
1da177e4 | 8 | #include "linux/slab.h" |
1da177e4 LT |
9 | #include "linux/sound.h" |
10 | #include "linux/soundcard.h" | |
90dc763f | 11 | #include "linux/smp_lock.h" |
1da177e4 | 12 | #include "asm/uaccess.h" |
1da177e4 LT |
13 | #include "init.h" |
14 | #include "os.h" | |
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 | ||
66 | /* /dev/dsp file operations */ | |
67 | ||
4d338e1a AV |
68 | static ssize_t hostaudio_read(struct file *file, char __user *buffer, |
69 | size_t count, loff_t *ppos) | |
1da177e4 | 70 | { |
d471c0fc | 71 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
72 | void *kbuf; |
73 | int err; | |
74 | ||
75 | #ifdef DEBUG | |
cb8fa61c | 76 | printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count); |
1da177e4 LT |
77 | #endif |
78 | ||
79 | kbuf = kmalloc(count, GFP_KERNEL); | |
cb8fa61c JD |
80 | if (kbuf == NULL) |
81 | return -ENOMEM; | |
1da177e4 | 82 | |
a6ea4cce | 83 | err = os_read_file(state->fd, kbuf, count); |
cb8fa61c | 84 | if (err < 0) |
1da177e4 LT |
85 | goto out; |
86 | ||
cb8fa61c | 87 | if (copy_to_user(buffer, kbuf, err)) |
1da177e4 LT |
88 | err = -EFAULT; |
89 | ||
d471c0fc | 90 | out: |
1da177e4 | 91 | kfree(kbuf); |
cb8fa61c | 92 | return err; |
1da177e4 LT |
93 | } |
94 | ||
4d338e1a | 95 | static ssize_t hostaudio_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
96 | size_t count, loff_t *ppos) |
97 | { | |
d471c0fc | 98 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
99 | void *kbuf; |
100 | int err; | |
101 | ||
102 | #ifdef DEBUG | |
cb8fa61c | 103 | printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count); |
1da177e4 LT |
104 | #endif |
105 | ||
106 | kbuf = kmalloc(count, GFP_KERNEL); | |
cb8fa61c JD |
107 | if (kbuf == NULL) |
108 | return -ENOMEM; | |
1da177e4 LT |
109 | |
110 | err = -EFAULT; | |
cb8fa61c | 111 | if (copy_from_user(kbuf, buffer, count)) |
1da177e4 LT |
112 | goto out; |
113 | ||
a6ea4cce | 114 | err = os_write_file(state->fd, kbuf, count); |
cb8fa61c | 115 | if (err < 0) |
1da177e4 LT |
116 | goto out; |
117 | *ppos += err; | |
118 | ||
119 | out: | |
120 | kfree(kbuf); | |
cb8fa61c | 121 | return err; |
1da177e4 LT |
122 | } |
123 | ||
cb8fa61c | 124 | static unsigned int hostaudio_poll(struct file *file, |
1da177e4 LT |
125 | struct poll_table_struct *wait) |
126 | { | |
d471c0fc | 127 | unsigned int mask = 0; |
1da177e4 LT |
128 | |
129 | #ifdef DEBUG | |
cb8fa61c | 130 | printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); |
1da177e4 LT |
131 | #endif |
132 | ||
cb8fa61c | 133 | return mask; |
1da177e4 LT |
134 | } |
135 | ||
d6c89d9a | 136 | static long hostaudio_ioctl(struct file *file, |
1da177e4 LT |
137 | unsigned int cmd, unsigned long arg) |
138 | { | |
d471c0fc | 139 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
140 | unsigned long data = 0; |
141 | int err; | |
142 | ||
143 | #ifdef DEBUG | |
cb8fa61c | 144 | printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); |
1da177e4 LT |
145 | #endif |
146 | switch(cmd){ | |
147 | case SNDCTL_DSP_SPEED: | |
148 | case SNDCTL_DSP_STEREO: | |
149 | case SNDCTL_DSP_GETBLKSIZE: | |
150 | case SNDCTL_DSP_CHANNELS: | |
151 | case SNDCTL_DSP_SUBDIVIDE: | |
152 | case SNDCTL_DSP_SETFRAGMENT: | |
cb8fa61c | 153 | if (get_user(data, (int __user *) arg)) |
484f1e2c | 154 | return -EFAULT; |
1da177e4 LT |
155 | break; |
156 | default: | |
157 | break; | |
158 | } | |
159 | ||
160 | err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data); | |
161 | ||
162 | switch(cmd){ | |
163 | case SNDCTL_DSP_SPEED: | |
164 | case SNDCTL_DSP_STEREO: | |
165 | case SNDCTL_DSP_GETBLKSIZE: | |
166 | case SNDCTL_DSP_CHANNELS: | |
167 | case SNDCTL_DSP_SUBDIVIDE: | |
168 | case SNDCTL_DSP_SETFRAGMENT: | |
cb8fa61c JD |
169 | if (put_user(data, (int __user *) arg)) |
170 | return -EFAULT; | |
1da177e4 LT |
171 | break; |
172 | default: | |
173 | break; | |
174 | } | |
175 | ||
cb8fa61c | 176 | return err; |
1da177e4 LT |
177 | } |
178 | ||
179 | static int hostaudio_open(struct inode *inode, struct file *file) | |
180 | { | |
d471c0fc JD |
181 | struct hostaudio_state *state; |
182 | int r = 0, w = 0; | |
183 | int ret; | |
1da177e4 LT |
184 | |
185 | #ifdef DEBUG | |
d6d1b650 | 186 | kparam_block_sysfs_write(dsp); |
cb8fa61c | 187 | printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); |
d6d1b650 | 188 | kparam_unblock_sysfs_write(dsp); |
1da177e4 LT |
189 | #endif |
190 | ||
d471c0fc | 191 | state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); |
cb8fa61c JD |
192 | if (state == NULL) |
193 | return -ENOMEM; | |
1da177e4 | 194 | |
cb8fa61c JD |
195 | if (file->f_mode & FMODE_READ) |
196 | r = 1; | |
197 | if (file->f_mode & FMODE_WRITE) | |
198 | w = 1; | |
1da177e4 | 199 | |
d6d1b650 | 200 | kparam_block_sysfs_write(dsp); |
90dc763f | 201 | lock_kernel(); |
1da177e4 | 202 | ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); |
90dc763f | 203 | unlock_kernel(); |
d6d1b650 | 204 | kparam_unblock_sysfs_write(dsp); |
90dc763f | 205 | |
cb8fa61c | 206 | if (ret < 0) { |
1da177e4 | 207 | kfree(state); |
cb8fa61c | 208 | return ret; |
d471c0fc | 209 | } |
1da177e4 | 210 | state->fd = ret; |
d471c0fc | 211 | file->private_data = state; |
cb8fa61c | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
215 | static int hostaudio_release(struct inode *inode, struct file *file) | |
216 | { | |
d471c0fc | 217 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
218 | |
219 | #ifdef DEBUG | |
cb8fa61c | 220 | printk(KERN_DEBUG "hostaudio: release called\n"); |
1da177e4 | 221 | #endif |
d471c0fc JD |
222 | os_close_file(state->fd); |
223 | kfree(state); | |
1da177e4 | 224 | |
cb8fa61c | 225 | return 0; |
1da177e4 LT |
226 | } |
227 | ||
228 | /* /dev/mixer file operations */ | |
229 | ||
d6c89d9a | 230 | static long hostmixer_ioctl_mixdev(struct file *file, |
1da177e4 LT |
231 | unsigned int cmd, unsigned long arg) |
232 | { | |
d471c0fc | 233 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
234 | |
235 | #ifdef DEBUG | |
cb8fa61c | 236 | printk(KERN_DEBUG "hostmixer: ioctl called\n"); |
1da177e4 LT |
237 | #endif |
238 | ||
cb8fa61c | 239 | return os_ioctl_generic(state->fd, cmd, arg); |
1da177e4 LT |
240 | } |
241 | ||
242 | static int hostmixer_open_mixdev(struct inode *inode, struct file *file) | |
243 | { | |
d471c0fc JD |
244 | struct hostmixer_state *state; |
245 | int r = 0, w = 0; | |
246 | int ret; | |
1da177e4 LT |
247 | |
248 | #ifdef DEBUG | |
cb8fa61c | 249 | printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); |
1da177e4 LT |
250 | #endif |
251 | ||
d471c0fc | 252 | state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); |
cb8fa61c JD |
253 | if (state == NULL) |
254 | return -ENOMEM; | |
1da177e4 | 255 | |
cb8fa61c JD |
256 | if (file->f_mode & FMODE_READ) |
257 | r = 1; | |
258 | if (file->f_mode & FMODE_WRITE) | |
259 | w = 1; | |
1da177e4 | 260 | |
d6d1b650 | 261 | kparam_block_sysfs_write(mixer); |
90dc763f | 262 | lock_kernel(); |
1da177e4 | 263 | ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); |
90dc763f | 264 | unlock_kernel(); |
d6d1b650 | 265 | kparam_unblock_sysfs_write(mixer); |
cb8fa61c JD |
266 | |
267 | if (ret < 0) { | |
d6d1b650 | 268 | kparam_block_sysfs_write(dsp); |
cb8fa61c JD |
269 | printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " |
270 | "err = %d\n", dsp, -ret); | |
d6d1b650 | 271 | kparam_unblock_sysfs_write(dsp); |
1da177e4 | 272 | kfree(state); |
cb8fa61c | 273 | return ret; |
d471c0fc | 274 | } |
1da177e4 | 275 | |
d471c0fc | 276 | file->private_data = state; |
cb8fa61c | 277 | return 0; |
1da177e4 LT |
278 | } |
279 | ||
280 | static int hostmixer_release(struct inode *inode, struct file *file) | |
281 | { | |
d471c0fc | 282 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
283 | |
284 | #ifdef DEBUG | |
cb8fa61c | 285 | printk(KERN_DEBUG "hostmixer: release called\n"); |
1da177e4 LT |
286 | #endif |
287 | ||
d471c0fc JD |
288 | os_close_file(state->fd); |
289 | kfree(state); | |
1da177e4 | 290 | |
cb8fa61c | 291 | return 0; |
1da177e4 LT |
292 | } |
293 | ||
1da177e4 LT |
294 | /* kernel module operations */ |
295 | ||
5e7672ec | 296 | static const struct file_operations hostaudio_fops = { |
d471c0fc JD |
297 | .owner = THIS_MODULE, |
298 | .llseek = no_llseek, | |
299 | .read = hostaudio_read, | |
300 | .write = hostaudio_write, | |
301 | .poll = hostaudio_poll, | |
d6c89d9a | 302 | .unlocked_ioctl = hostaudio_ioctl, |
d471c0fc JD |
303 | .mmap = NULL, |
304 | .open = hostaudio_open, | |
305 | .release = hostaudio_release, | |
1da177e4 LT |
306 | }; |
307 | ||
5e7672ec | 308 | static const struct file_operations hostmixer_fops = { |
d471c0fc JD |
309 | .owner = THIS_MODULE, |
310 | .llseek = no_llseek, | |
d6c89d9a | 311 | .unlocked_ioctl = hostmixer_ioctl_mixdev, |
d471c0fc JD |
312 | .open = hostmixer_open_mixdev, |
313 | .release = hostmixer_release, | |
1da177e4 LT |
314 | }; |
315 | ||
316 | struct { | |
317 | int dev_audio; | |
318 | int dev_mixer; | |
319 | } module_data; | |
320 | ||
321 | MODULE_AUTHOR("Steve Schmidtke"); | |
322 | MODULE_DESCRIPTION("UML Audio Relay"); | |
323 | MODULE_LICENSE("GPL"); | |
324 | ||
325 | static int __init hostaudio_init_module(void) | |
326 | { | |
d6d1b650 | 327 | __kernel_param_lock(); |
d471c0fc | 328 | printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", |
1da177e4 | 329 | dsp, mixer); |
d6d1b650 | 330 | __kernel_param_unlock(); |
1da177e4 LT |
331 | |
332 | module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); | |
cb8fa61c | 333 | if (module_data.dev_audio < 0) { |
d471c0fc JD |
334 | printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); |
335 | return -ENODEV; | |
336 | } | |
1da177e4 LT |
337 | |
338 | module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); | |
cb8fa61c | 339 | if (module_data.dev_mixer < 0) { |
d471c0fc | 340 | printk(KERN_ERR "hostmixer: couldn't register mixer " |
1da177e4 | 341 | "device!\n"); |
d471c0fc JD |
342 | unregister_sound_dsp(module_data.dev_audio); |
343 | return -ENODEV; | |
344 | } | |
1da177e4 | 345 | |
d471c0fc | 346 | return 0; |
1da177e4 LT |
347 | } |
348 | ||
349 | static void __exit hostaudio_cleanup_module (void) | |
350 | { | |
d471c0fc JD |
351 | unregister_sound_mixer(module_data.dev_mixer); |
352 | unregister_sound_dsp(module_data.dev_audio); | |
1da177e4 LT |
353 | } |
354 | ||
355 | module_init(hostaudio_init_module); | |
356 | module_exit(hostaudio_cleanup_module); |