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 kparam_block_sysfs_write(dsp); 191 printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); 192 kparam_unblock_sysfs_write(dsp); 193 #endif 194 195 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); 196 if (state == NULL) 197 return -ENOMEM; 198 199 if (file->f_mode & FMODE_READ) 200 r = 1; 201 if (file->f_mode & FMODE_WRITE) 202 w = 1; 203 204 kparam_block_sysfs_write(dsp); 205 lock_kernel(); 206 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 207 unlock_kernel(); 208 kparam_unblock_sysfs_write(dsp); 209 210 if (ret < 0) { 211 kfree(state); 212 return ret; 213 } 214 state->fd = ret; 215 file->private_data = state; 216 return 0; 217 } 218 219 static int hostaudio_release(struct inode *inode, struct file *file) 220 { 221 struct hostaudio_state *state = file->private_data; 222 223 #ifdef DEBUG 224 printk(KERN_DEBUG "hostaudio: release called\n"); 225 #endif 226 os_close_file(state->fd); 227 kfree(state); 228 229 return 0; 230 } 231 232 /* /dev/mixer file operations */ 233 234 static long hostmixer_ioctl_mixdev(struct file *file, 235 unsigned int cmd, unsigned long arg) 236 { 237 struct hostmixer_state *state = file->private_data; 238 239 #ifdef DEBUG 240 printk(KERN_DEBUG "hostmixer: ioctl called\n"); 241 #endif 242 243 return os_ioctl_generic(state->fd, cmd, arg); 244 } 245 246 static int hostmixer_open_mixdev(struct inode *inode, struct file *file) 247 { 248 struct hostmixer_state *state; 249 int r = 0, w = 0; 250 int ret; 251 252 #ifdef DEBUG 253 printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); 254 #endif 255 256 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); 257 if (state == NULL) 258 return -ENOMEM; 259 260 if (file->f_mode & FMODE_READ) 261 r = 1; 262 if (file->f_mode & FMODE_WRITE) 263 w = 1; 264 265 kparam_block_sysfs_write(mixer); 266 lock_kernel(); 267 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); 268 unlock_kernel(); 269 kparam_unblock_sysfs_write(mixer); 270 271 if (ret < 0) { 272 kparam_block_sysfs_write(dsp); 273 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " 274 "err = %d\n", dsp, -ret); 275 kparam_unblock_sysfs_write(dsp); 276 kfree(state); 277 return ret; 278 } 279 280 file->private_data = state; 281 return 0; 282 } 283 284 static int hostmixer_release(struct inode *inode, struct file *file) 285 { 286 struct hostmixer_state *state = file->private_data; 287 288 #ifdef DEBUG 289 printk(KERN_DEBUG "hostmixer: release called\n"); 290 #endif 291 292 os_close_file(state->fd); 293 kfree(state); 294 295 return 0; 296 } 297 298 /* kernel module operations */ 299 300 static const struct file_operations hostaudio_fops = { 301 .owner = THIS_MODULE, 302 .llseek = no_llseek, 303 .read = hostaudio_read, 304 .write = hostaudio_write, 305 .poll = hostaudio_poll, 306 .unlocked_ioctl = hostaudio_ioctl, 307 .mmap = NULL, 308 .open = hostaudio_open, 309 .release = hostaudio_release, 310 }; 311 312 static const struct file_operations hostmixer_fops = { 313 .owner = THIS_MODULE, 314 .llseek = no_llseek, 315 .unlocked_ioctl = hostmixer_ioctl_mixdev, 316 .open = hostmixer_open_mixdev, 317 .release = hostmixer_release, 318 }; 319 320 struct { 321 int dev_audio; 322 int dev_mixer; 323 } module_data; 324 325 MODULE_AUTHOR("Steve Schmidtke"); 326 MODULE_DESCRIPTION("UML Audio Relay"); 327 MODULE_LICENSE("GPL"); 328 329 static int __init hostaudio_init_module(void) 330 { 331 __kernel_param_lock(); 332 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 333 dsp, mixer); 334 __kernel_param_unlock(); 335 336 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 337 if (module_data.dev_audio < 0) { 338 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 339 return -ENODEV; 340 } 341 342 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 343 if (module_data.dev_mixer < 0) { 344 printk(KERN_ERR "hostmixer: couldn't register mixer " 345 "device!\n"); 346 unregister_sound_dsp(module_data.dev_audio); 347 return -ENODEV; 348 } 349 350 return 0; 351 } 352 353 static void __exit hostaudio_cleanup_module (void) 354 { 355 unregister_sound_mixer(module_data.dev_mixer); 356 unregister_sound_dsp(module_data.dev_audio); 357 } 358 359 module_init(hostaudio_init_module); 360 module_exit(hostaudio_cleanup_module); 361