1 /* 2 * Copyright (C) 2002 Steve Schmidtke 3 * Licensed under the GPL 4 */ 5 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/smp_lock.h" 12 #include "asm/uaccess.h" 13 #include "init.h" 14 #include "os.h" 15 16 struct hostaudio_state { 17 int fd; 18 }; 19 20 struct hostmixer_state { 21 int fd; 22 }; 23 24 #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp" 25 #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer" 26 27 /* 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; 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 62 module_param(dsp, charp, 0644); 63 MODULE_PARM_DESC(dsp, DSP_HELP); 64 65 module_param(mixer, charp, 0644); 66 MODULE_PARM_DESC(mixer, MIXER_HELP); 67 68 #endif 69 70 /* /dev/dsp file operations */ 71 72 static ssize_t hostaudio_read(struct file *file, char __user *buffer, 73 size_t count, loff_t *ppos) 74 { 75 struct hostaudio_state *state = file->private_data; 76 void *kbuf; 77 int err; 78 79 #ifdef DEBUG 80 printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count); 81 #endif 82 83 kbuf = kmalloc(count, GFP_KERNEL); 84 if (kbuf == NULL) 85 return -ENOMEM; 86 87 err = os_read_file(state->fd, kbuf, count); 88 if (err < 0) 89 goto out; 90 91 if (copy_to_user(buffer, kbuf, err)) 92 err = -EFAULT; 93 94 out: 95 kfree(kbuf); 96 return err; 97 } 98 99 static ssize_t hostaudio_write(struct file *file, const char __user *buffer, 100 size_t count, loff_t *ppos) 101 { 102 struct hostaudio_state *state = file->private_data; 103 void *kbuf; 104 int err; 105 106 #ifdef DEBUG 107 printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count); 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; 117 118 err = os_write_file(state->fd, kbuf, count); 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 { 131 unsigned int mask = 0; 132 133 #ifdef DEBUG 134 printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); 135 #endif 136 137 return mask; 138 } 139 140 static long hostaudio_ioctl(struct file *file, 141 unsigned int cmd, unsigned long arg) 142 { 143 struct hostaudio_state *state = file->private_data; 144 unsigned long data = 0; 145 int err; 146 147 #ifdef DEBUG 148 printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); 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: 157 if (get_user(data, (int __user *) arg)) 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: 173 if (put_user(data, (int __user *) arg)) 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 { 185 struct hostaudio_state *state; 186 int r = 0, w = 0; 187 int ret; 188 189 #ifdef DEBUG 190 printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); 191 #endif 192 193 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); 194 if (state == NULL) 195 return -ENOMEM; 196 197 if (file->f_mode & FMODE_READ) 198 r = 1; 199 if (file->f_mode & FMODE_WRITE) 200 w = 1; 201 202 lock_kernel(); 203 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 204 unlock_kernel(); 205 206 if (ret < 0) { 207 kfree(state); 208 return ret; 209 } 210 state->fd = ret; 211 file->private_data = state; 212 return 0; 213 } 214 215 static int hostaudio_release(struct inode *inode, struct file *file) 216 { 217 struct hostaudio_state *state = file->private_data; 218 219 #ifdef DEBUG 220 printk(KERN_DEBUG "hostaudio: release called\n"); 221 #endif 222 os_close_file(state->fd); 223 kfree(state); 224 225 return 0; 226 } 227 228 /* /dev/mixer file operations */ 229 230 static long hostmixer_ioctl_mixdev(struct file *file, 231 unsigned int cmd, unsigned long arg) 232 { 233 struct hostmixer_state *state = file->private_data; 234 235 #ifdef DEBUG 236 printk(KERN_DEBUG "hostmixer: ioctl called\n"); 237 #endif 238 239 return os_ioctl_generic(state->fd, cmd, arg); 240 } 241 242 static int hostmixer_open_mixdev(struct inode *inode, struct file *file) 243 { 244 struct hostmixer_state *state; 245 int r = 0, w = 0; 246 int ret; 247 248 #ifdef DEBUG 249 printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); 250 #endif 251 252 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); 253 if (state == NULL) 254 return -ENOMEM; 255 256 if (file->f_mode & FMODE_READ) 257 r = 1; 258 if (file->f_mode & FMODE_WRITE) 259 w = 1; 260 261 lock_kernel(); 262 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); 263 unlock_kernel(); 264 265 if (ret < 0) { 266 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " 267 "err = %d\n", dsp, -ret); 268 kfree(state); 269 return ret; 270 } 271 272 file->private_data = state; 273 return 0; 274 } 275 276 static int hostmixer_release(struct inode *inode, struct file *file) 277 { 278 struct hostmixer_state *state = file->private_data; 279 280 #ifdef DEBUG 281 printk(KERN_DEBUG "hostmixer: release called\n"); 282 #endif 283 284 os_close_file(state->fd); 285 kfree(state); 286 287 return 0; 288 } 289 290 /* kernel module operations */ 291 292 static const struct file_operations hostaudio_fops = { 293 .owner = THIS_MODULE, 294 .llseek = no_llseek, 295 .read = hostaudio_read, 296 .write = hostaudio_write, 297 .poll = hostaudio_poll, 298 .unlocked_ioctl = hostaudio_ioctl, 299 .mmap = NULL, 300 .open = hostaudio_open, 301 .release = hostaudio_release, 302 }; 303 304 static const struct file_operations hostmixer_fops = { 305 .owner = THIS_MODULE, 306 .llseek = no_llseek, 307 .unlocked_ioctl = hostmixer_ioctl_mixdev, 308 .open = hostmixer_open_mixdev, 309 .release = hostmixer_release, 310 }; 311 312 struct { 313 int dev_audio; 314 int dev_mixer; 315 } module_data; 316 317 MODULE_AUTHOR("Steve Schmidtke"); 318 MODULE_DESCRIPTION("UML Audio Relay"); 319 MODULE_LICENSE("GPL"); 320 321 static int __init hostaudio_init_module(void) 322 { 323 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 324 dsp, mixer); 325 326 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 327 if (module_data.dev_audio < 0) { 328 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 329 return -ENODEV; 330 } 331 332 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 333 if (module_data.dev_mixer < 0) { 334 printk(KERN_ERR "hostmixer: couldn't register mixer " 335 "device!\n"); 336 unregister_sound_dsp(module_data.dev_audio); 337 return -ENODEV; 338 } 339 340 return 0; 341 } 342 343 static void __exit hostaudio_cleanup_module (void) 344 { 345 unregister_sound_mixer(module_data.dev_mixer); 346 unregister_sound_dsp(module_data.dev_audio); 347 } 348 349 module_init(hostaudio_init_module); 350 module_exit(hostaudio_cleanup_module); 351