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 | ||
1ceb3628 AV |
108 | kbuf = memdup_user(buffer, count); |
109 | if (IS_ERR(kbuf)) | |
110 | return PTR_ERR(kbuf); | |
1da177e4 | 111 | |
a6ea4cce | 112 | err = os_write_file(state->fd, kbuf, count); |
cb8fa61c | 113 | if (err < 0) |
1da177e4 LT |
114 | goto out; |
115 | *ppos += err; | |
116 | ||
117 | out: | |
118 | kfree(kbuf); | |
cb8fa61c | 119 | return err; |
1da177e4 LT |
120 | } |
121 | ||
cb8fa61c | 122 | static unsigned int hostaudio_poll(struct file *file, |
1da177e4 LT |
123 | struct poll_table_struct *wait) |
124 | { | |
d471c0fc | 125 | unsigned int mask = 0; |
1da177e4 LT |
126 | |
127 | #ifdef DEBUG | |
cb8fa61c | 128 | printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); |
1da177e4 LT |
129 | #endif |
130 | ||
cb8fa61c | 131 | return mask; |
1da177e4 LT |
132 | } |
133 | ||
d6c89d9a | 134 | static long hostaudio_ioctl(struct file *file, |
1da177e4 LT |
135 | unsigned int cmd, unsigned long arg) |
136 | { | |
d471c0fc | 137 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
138 | unsigned long data = 0; |
139 | int err; | |
140 | ||
141 | #ifdef DEBUG | |
cb8fa61c | 142 | printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); |
1da177e4 LT |
143 | #endif |
144 | switch(cmd){ | |
145 | case SNDCTL_DSP_SPEED: | |
146 | case SNDCTL_DSP_STEREO: | |
147 | case SNDCTL_DSP_GETBLKSIZE: | |
148 | case SNDCTL_DSP_CHANNELS: | |
149 | case SNDCTL_DSP_SUBDIVIDE: | |
150 | case SNDCTL_DSP_SETFRAGMENT: | |
cb8fa61c | 151 | if (get_user(data, (int __user *) arg)) |
484f1e2c | 152 | return -EFAULT; |
1da177e4 LT |
153 | break; |
154 | default: | |
155 | break; | |
156 | } | |
157 | ||
158 | err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data); | |
159 | ||
160 | switch(cmd){ | |
161 | case SNDCTL_DSP_SPEED: | |
162 | case SNDCTL_DSP_STEREO: | |
163 | case SNDCTL_DSP_GETBLKSIZE: | |
164 | case SNDCTL_DSP_CHANNELS: | |
165 | case SNDCTL_DSP_SUBDIVIDE: | |
166 | case SNDCTL_DSP_SETFRAGMENT: | |
cb8fa61c JD |
167 | if (put_user(data, (int __user *) arg)) |
168 | return -EFAULT; | |
1da177e4 LT |
169 | break; |
170 | default: | |
171 | break; | |
172 | } | |
173 | ||
cb8fa61c | 174 | return err; |
1da177e4 LT |
175 | } |
176 | ||
177 | static int hostaudio_open(struct inode *inode, struct file *file) | |
178 | { | |
d471c0fc JD |
179 | struct hostaudio_state *state; |
180 | int r = 0, w = 0; | |
181 | int ret; | |
1da177e4 LT |
182 | |
183 | #ifdef DEBUG | |
b51d23e4 | 184 | kernel_param_lock(THIS_MODULE); |
cb8fa61c | 185 | printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); |
b51d23e4 | 186 | kernel_param_unlock(THIS_MODULE); |
1da177e4 LT |
187 | #endif |
188 | ||
d471c0fc | 189 | state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); |
cb8fa61c JD |
190 | if (state == NULL) |
191 | return -ENOMEM; | |
1da177e4 | 192 | |
cb8fa61c JD |
193 | if (file->f_mode & FMODE_READ) |
194 | r = 1; | |
195 | if (file->f_mode & FMODE_WRITE) | |
196 | w = 1; | |
1da177e4 | 197 | |
b51d23e4 | 198 | kernel_param_lock(THIS_MODULE); |
9a181c58 | 199 | mutex_lock(&hostaudio_mutex); |
1da177e4 | 200 | ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); |
9a181c58 | 201 | mutex_unlock(&hostaudio_mutex); |
b51d23e4 | 202 | kernel_param_unlock(THIS_MODULE); |
90dc763f | 203 | |
cb8fa61c | 204 | if (ret < 0) { |
1da177e4 | 205 | kfree(state); |
cb8fa61c | 206 | return ret; |
d471c0fc | 207 | } |
1da177e4 | 208 | state->fd = ret; |
d471c0fc | 209 | file->private_data = state; |
cb8fa61c | 210 | return 0; |
1da177e4 LT |
211 | } |
212 | ||
213 | static int hostaudio_release(struct inode *inode, struct file *file) | |
214 | { | |
d471c0fc | 215 | struct hostaudio_state *state = file->private_data; |
1da177e4 LT |
216 | |
217 | #ifdef DEBUG | |
cb8fa61c | 218 | printk(KERN_DEBUG "hostaudio: release called\n"); |
1da177e4 | 219 | #endif |
d471c0fc JD |
220 | os_close_file(state->fd); |
221 | kfree(state); | |
1da177e4 | 222 | |
cb8fa61c | 223 | return 0; |
1da177e4 LT |
224 | } |
225 | ||
226 | /* /dev/mixer file operations */ | |
227 | ||
d6c89d9a | 228 | static long hostmixer_ioctl_mixdev(struct file *file, |
1da177e4 LT |
229 | unsigned int cmd, unsigned long arg) |
230 | { | |
d471c0fc | 231 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
232 | |
233 | #ifdef DEBUG | |
cb8fa61c | 234 | printk(KERN_DEBUG "hostmixer: ioctl called\n"); |
1da177e4 LT |
235 | #endif |
236 | ||
cb8fa61c | 237 | return os_ioctl_generic(state->fd, cmd, arg); |
1da177e4 LT |
238 | } |
239 | ||
240 | static int hostmixer_open_mixdev(struct inode *inode, struct file *file) | |
241 | { | |
d471c0fc JD |
242 | struct hostmixer_state *state; |
243 | int r = 0, w = 0; | |
244 | int ret; | |
1da177e4 LT |
245 | |
246 | #ifdef DEBUG | |
cb8fa61c | 247 | printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); |
1da177e4 LT |
248 | #endif |
249 | ||
d471c0fc | 250 | state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); |
cb8fa61c JD |
251 | if (state == NULL) |
252 | return -ENOMEM; | |
1da177e4 | 253 | |
cb8fa61c JD |
254 | if (file->f_mode & FMODE_READ) |
255 | r = 1; | |
256 | if (file->f_mode & FMODE_WRITE) | |
257 | w = 1; | |
1da177e4 | 258 | |
b51d23e4 | 259 | kernel_param_lock(THIS_MODULE); |
9a181c58 | 260 | mutex_lock(&hostaudio_mutex); |
1da177e4 | 261 | ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); |
9a181c58 | 262 | mutex_unlock(&hostaudio_mutex); |
b51d23e4 | 263 | kernel_param_unlock(THIS_MODULE); |
cb8fa61c JD |
264 | |
265 | if (ret < 0) { | |
b51d23e4 | 266 | kernel_param_lock(THIS_MODULE); |
cb8fa61c JD |
267 | printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " |
268 | "err = %d\n", dsp, -ret); | |
b51d23e4 | 269 | kernel_param_unlock(THIS_MODULE); |
1da177e4 | 270 | kfree(state); |
cb8fa61c | 271 | return ret; |
d471c0fc | 272 | } |
1da177e4 | 273 | |
d471c0fc | 274 | file->private_data = state; |
cb8fa61c | 275 | return 0; |
1da177e4 LT |
276 | } |
277 | ||
278 | static int hostmixer_release(struct inode *inode, struct file *file) | |
279 | { | |
d471c0fc | 280 | struct hostmixer_state *state = file->private_data; |
1da177e4 LT |
281 | |
282 | #ifdef DEBUG | |
cb8fa61c | 283 | printk(KERN_DEBUG "hostmixer: release called\n"); |
1da177e4 LT |
284 | #endif |
285 | ||
d471c0fc JD |
286 | os_close_file(state->fd); |
287 | kfree(state); | |
1da177e4 | 288 | |
cb8fa61c | 289 | return 0; |
1da177e4 LT |
290 | } |
291 | ||
1da177e4 LT |
292 | /* kernel module operations */ |
293 | ||
5e7672ec | 294 | static const struct file_operations hostaudio_fops = { |
d471c0fc JD |
295 | .owner = THIS_MODULE, |
296 | .llseek = no_llseek, | |
297 | .read = hostaudio_read, | |
298 | .write = hostaudio_write, | |
299 | .poll = hostaudio_poll, | |
d6c89d9a | 300 | .unlocked_ioctl = hostaudio_ioctl, |
d471c0fc JD |
301 | .mmap = NULL, |
302 | .open = hostaudio_open, | |
303 | .release = hostaudio_release, | |
1da177e4 LT |
304 | }; |
305 | ||
5e7672ec | 306 | static const struct file_operations hostmixer_fops = { |
d471c0fc JD |
307 | .owner = THIS_MODULE, |
308 | .llseek = no_llseek, | |
d6c89d9a | 309 | .unlocked_ioctl = hostmixer_ioctl_mixdev, |
d471c0fc JD |
310 | .open = hostmixer_open_mixdev, |
311 | .release = hostmixer_release, | |
1da177e4 LT |
312 | }; |
313 | ||
314 | struct { | |
315 | int dev_audio; | |
316 | int dev_mixer; | |
317 | } module_data; | |
318 | ||
319 | MODULE_AUTHOR("Steve Schmidtke"); | |
320 | MODULE_DESCRIPTION("UML Audio Relay"); | |
321 | MODULE_LICENSE("GPL"); | |
322 | ||
323 | static int __init hostaudio_init_module(void) | |
324 | { | |
b51d23e4 | 325 | kernel_param_lock(THIS_MODULE); |
d471c0fc | 326 | printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", |
1da177e4 | 327 | dsp, mixer); |
b51d23e4 | 328 | kernel_param_unlock(THIS_MODULE); |
1da177e4 LT |
329 | |
330 | module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); | |
cb8fa61c | 331 | if (module_data.dev_audio < 0) { |
d471c0fc JD |
332 | printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); |
333 | return -ENODEV; | |
334 | } | |
1da177e4 LT |
335 | |
336 | module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); | |
cb8fa61c | 337 | if (module_data.dev_mixer < 0) { |
d471c0fc | 338 | printk(KERN_ERR "hostmixer: couldn't register mixer " |
1da177e4 | 339 | "device!\n"); |
d471c0fc JD |
340 | unregister_sound_dsp(module_data.dev_audio); |
341 | return -ENODEV; | |
342 | } | |
1da177e4 | 343 | |
d471c0fc | 344 | return 0; |
1da177e4 LT |
345 | } |
346 | ||
347 | static void __exit hostaudio_cleanup_module (void) | |
348 | { | |
d471c0fc JD |
349 | unregister_sound_mixer(module_data.dev_mixer); |
350 | unregister_sound_dsp(module_data.dev_audio); | |
1da177e4 LT |
351 | } |
352 | ||
353 | module_init(hostaudio_init_module); | |
354 | module_exit(hostaudio_cleanup_module); |