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/mutex.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 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 48 #ifndef MODULE 49 static int set_dsp(char *name, int *add) 50 { 51 dsp = name; 52 return 0; 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; 60 return 0; 61 } 62 63 __uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP); 64 #endif 65 66 static DEFINE_MUTEX(hostaudio_mutex); 67 68 /* /dev/dsp file operations */ 69 70 static ssize_t hostaudio_read(struct file *file, char __user *buffer, 71 size_t count, loff_t *ppos) 72 { 73 struct hostaudio_state *state = file->private_data; 74 void *kbuf; 75 int err; 76 77 #ifdef DEBUG 78 printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count); 79 #endif 80 81 kbuf = kmalloc(count, GFP_KERNEL); 82 if (kbuf == NULL) 83 return -ENOMEM; 84 85 err = os_read_file(state->fd, kbuf, count); 86 if (err < 0) 87 goto out; 88 89 if (copy_to_user(buffer, kbuf, err)) 90 err = -EFAULT; 91 92 out: 93 kfree(kbuf); 94 return err; 95 } 96 97 static ssize_t hostaudio_write(struct file *file, const char __user *buffer, 98 size_t count, loff_t *ppos) 99 { 100 struct hostaudio_state *state = file->private_data; 101 void *kbuf; 102 int err; 103 104 #ifdef DEBUG 105 printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count); 106 #endif 107 108 kbuf = kmalloc(count, GFP_KERNEL); 109 if (kbuf == NULL) 110 return -ENOMEM; 111 112 err = -EFAULT; 113 if (copy_from_user(kbuf, buffer, count)) 114 goto out; 115 116 err = os_write_file(state->fd, kbuf, count); 117 if (err < 0) 118 goto out; 119 *ppos += err; 120 121 out: 122 kfree(kbuf); 123 return err; 124 } 125 126 static unsigned int hostaudio_poll(struct file *file, 127 struct poll_table_struct *wait) 128 { 129 unsigned int mask = 0; 130 131 #ifdef DEBUG 132 printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); 133 #endif 134 135 return mask; 136 } 137 138 static long hostaudio_ioctl(struct file *file, 139 unsigned int cmd, unsigned long arg) 140 { 141 struct hostaudio_state *state = file->private_data; 142 unsigned long data = 0; 143 int err; 144 145 #ifdef DEBUG 146 printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); 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: 155 if (get_user(data, (int __user *) arg)) 156 return -EFAULT; 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: 171 if (put_user(data, (int __user *) arg)) 172 return -EFAULT; 173 break; 174 default: 175 break; 176 } 177 178 return err; 179 } 180 181 static int hostaudio_open(struct inode *inode, struct file *file) 182 { 183 struct hostaudio_state *state; 184 int r = 0, w = 0; 185 int ret; 186 187 #ifdef DEBUG 188 kparam_block_sysfs_write(dsp); 189 printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); 190 kparam_unblock_sysfs_write(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 kparam_block_sysfs_write(dsp); 203 mutex_lock(&hostaudio_mutex); 204 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 205 mutex_unlock(&hostaudio_mutex); 206 kparam_unblock_sysfs_write(dsp); 207 208 if (ret < 0) { 209 kfree(state); 210 return ret; 211 } 212 state->fd = ret; 213 file->private_data = state; 214 return 0; 215 } 216 217 static int hostaudio_release(struct inode *inode, struct file *file) 218 { 219 struct hostaudio_state *state = file->private_data; 220 221 #ifdef DEBUG 222 printk(KERN_DEBUG "hostaudio: release called\n"); 223 #endif 224 os_close_file(state->fd); 225 kfree(state); 226 227 return 0; 228 } 229 230 /* /dev/mixer file operations */ 231 232 static long hostmixer_ioctl_mixdev(struct file *file, 233 unsigned int cmd, unsigned long arg) 234 { 235 struct hostmixer_state *state = file->private_data; 236 237 #ifdef DEBUG 238 printk(KERN_DEBUG "hostmixer: ioctl called\n"); 239 #endif 240 241 return os_ioctl_generic(state->fd, cmd, arg); 242 } 243 244 static int hostmixer_open_mixdev(struct inode *inode, struct file *file) 245 { 246 struct hostmixer_state *state; 247 int r = 0, w = 0; 248 int ret; 249 250 #ifdef DEBUG 251 printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); 252 #endif 253 254 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); 255 if (state == NULL) 256 return -ENOMEM; 257 258 if (file->f_mode & FMODE_READ) 259 r = 1; 260 if (file->f_mode & FMODE_WRITE) 261 w = 1; 262 263 kparam_block_sysfs_write(mixer); 264 mutex_lock(&hostaudio_mutex); 265 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); 266 mutex_unlock(&hostaudio_mutex); 267 kparam_unblock_sysfs_write(mixer); 268 269 if (ret < 0) { 270 kparam_block_sysfs_write(dsp); 271 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " 272 "err = %d\n", dsp, -ret); 273 kparam_unblock_sysfs_write(dsp); 274 kfree(state); 275 return ret; 276 } 277 278 file->private_data = state; 279 return 0; 280 } 281 282 static int hostmixer_release(struct inode *inode, struct file *file) 283 { 284 struct hostmixer_state *state = file->private_data; 285 286 #ifdef DEBUG 287 printk(KERN_DEBUG "hostmixer: release called\n"); 288 #endif 289 290 os_close_file(state->fd); 291 kfree(state); 292 293 return 0; 294 } 295 296 /* kernel module operations */ 297 298 static const struct file_operations hostaudio_fops = { 299 .owner = THIS_MODULE, 300 .llseek = no_llseek, 301 .read = hostaudio_read, 302 .write = hostaudio_write, 303 .poll = hostaudio_poll, 304 .unlocked_ioctl = hostaudio_ioctl, 305 .mmap = NULL, 306 .open = hostaudio_open, 307 .release = hostaudio_release, 308 }; 309 310 static const struct file_operations hostmixer_fops = { 311 .owner = THIS_MODULE, 312 .llseek = no_llseek, 313 .unlocked_ioctl = hostmixer_ioctl_mixdev, 314 .open = hostmixer_open_mixdev, 315 .release = hostmixer_release, 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 { 329 __kernel_param_lock(); 330 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 331 dsp, mixer); 332 __kernel_param_unlock(); 333 334 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 335 if (module_data.dev_audio < 0) { 336 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 337 return -ENODEV; 338 } 339 340 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 341 if (module_data.dev_mixer < 0) { 342 printk(KERN_ERR "hostmixer: couldn't register mixer " 343 "device!\n"); 344 unregister_sound_dsp(module_data.dev_audio); 345 return -ENODEV; 346 } 347 348 return 0; 349 } 350 351 static void __exit hostaudio_cleanup_module (void) 352 { 353 unregister_sound_mixer(module_data.dev_mixer); 354 unregister_sound_dsp(module_data.dev_audio); 355 } 356 357 module_init(hostaudio_init_module); 358 module_exit(hostaudio_cleanup_module); 359