1 /* 2 * Copyright (C) 2002 Steve Schmidtke 3 * Licensed under the GPL 4 */ 5 6 #include "linux/config.h" 7 #include "linux/module.h" 8 #include "linux/init.h" 9 #include "linux/slab.h" 10 #include "linux/fs.h" 11 #include "linux/sound.h" 12 #include "linux/soundcard.h" 13 #include "asm/uaccess.h" 14 #include "kern_util.h" 15 #include "init.h" 16 #include "os.h" 17 18 struct hostaudio_state { 19 int fd; 20 }; 21 22 struct hostmixer_state { 23 int fd; 24 }; 25 26 #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp" 27 #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer" 28 29 /* Only changed from linux_main at boot time */ 30 char *dsp = HOSTAUDIO_DEV_DSP; 31 char *mixer = HOSTAUDIO_DEV_MIXER; 32 33 #define DSP_HELP \ 34 " This is used to specify the host dsp device to the hostaudio driver.\n" \ 35 " The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n" 36 37 #define MIXER_HELP \ 38 " This is used to specify the host mixer device to the hostaudio driver.\n"\ 39 " The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n" 40 41 #ifndef MODULE 42 static int set_dsp(char *name, int *add) 43 { 44 dsp = name; 45 return(0); 46 } 47 48 __uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP); 49 50 static int set_mixer(char *name, int *add) 51 { 52 mixer = name; 53 return(0); 54 } 55 56 __uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP); 57 58 #else /*MODULE*/ 59 60 module_param(dsp, charp, 0644); 61 MODULE_PARM_DESC(dsp, DSP_HELP); 62 63 module_param(mixer, charp, 0644); 64 MODULE_PARM_DESC(mixer, MIXER_HELP); 65 66 #endif 67 68 /* /dev/dsp file operations */ 69 70 static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count, 71 loff_t *ppos) 72 { 73 struct hostaudio_state *state = file->private_data; 74 void *kbuf; 75 int err; 76 77 #ifdef DEBUG 78 printk("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 *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("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("hostaudio: poll called (unimplemented)\n"); 133 #endif 134 135 return(mask); 136 } 137 138 static int hostaudio_ioctl(struct inode *inode, 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("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 *) 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 *) 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 printk("hostaudio: open called (host: %s)\n", dsp); 189 #endif 190 191 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); 192 if(state == NULL) 193 return(-ENOMEM); 194 195 if(file->f_mode & FMODE_READ) r = 1; 196 if(file->f_mode & FMODE_WRITE) w = 1; 197 198 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 199 if(ret < 0){ 200 kfree(state); 201 return(ret); 202 } 203 204 state->fd = ret; 205 file->private_data = state; 206 return(0); 207 } 208 209 static int hostaudio_release(struct inode *inode, struct file *file) 210 { 211 struct hostaudio_state *state = file->private_data; 212 213 #ifdef DEBUG 214 printk("hostaudio: release called\n"); 215 #endif 216 217 os_close_file(state->fd); 218 kfree(state); 219 220 return(0); 221 } 222 223 /* /dev/mixer file operations */ 224 225 static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file, 226 unsigned int cmd, unsigned long arg) 227 { 228 struct hostmixer_state *state = file->private_data; 229 230 #ifdef DEBUG 231 printk("hostmixer: ioctl called\n"); 232 #endif 233 234 return(os_ioctl_generic(state->fd, cmd, arg)); 235 } 236 237 static int hostmixer_open_mixdev(struct inode *inode, struct file *file) 238 { 239 struct hostmixer_state *state; 240 int r = 0, w = 0; 241 int ret; 242 243 #ifdef DEBUG 244 printk("hostmixer: open called (host: %s)\n", mixer); 245 #endif 246 247 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); 248 if(state == NULL) return(-ENOMEM); 249 250 if(file->f_mode & FMODE_READ) r = 1; 251 if(file->f_mode & FMODE_WRITE) w = 1; 252 253 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); 254 255 if(ret < 0){ 256 printk("hostaudio_open_mixdev failed to open '%s', err = %d\n", 257 dsp, -ret); 258 kfree(state); 259 return(ret); 260 } 261 262 file->private_data = state; 263 return(0); 264 } 265 266 static int hostmixer_release(struct inode *inode, struct file *file) 267 { 268 struct hostmixer_state *state = file->private_data; 269 270 #ifdef DEBUG 271 printk("hostmixer: release called\n"); 272 #endif 273 274 os_close_file(state->fd); 275 kfree(state); 276 277 return(0); 278 } 279 280 281 /* kernel module operations */ 282 283 static struct file_operations hostaudio_fops = { 284 .owner = THIS_MODULE, 285 .llseek = no_llseek, 286 .read = hostaudio_read, 287 .write = hostaudio_write, 288 .poll = hostaudio_poll, 289 .ioctl = hostaudio_ioctl, 290 .mmap = NULL, 291 .open = hostaudio_open, 292 .release = hostaudio_release, 293 }; 294 295 static struct file_operations hostmixer_fops = { 296 .owner = THIS_MODULE, 297 .llseek = no_llseek, 298 .ioctl = hostmixer_ioctl_mixdev, 299 .open = hostmixer_open_mixdev, 300 .release = hostmixer_release, 301 }; 302 303 struct { 304 int dev_audio; 305 int dev_mixer; 306 } module_data; 307 308 MODULE_AUTHOR("Steve Schmidtke"); 309 MODULE_DESCRIPTION("UML Audio Relay"); 310 MODULE_LICENSE("GPL"); 311 312 static int __init hostaudio_init_module(void) 313 { 314 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 315 dsp, mixer); 316 317 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 318 if(module_data.dev_audio < 0){ 319 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 320 return -ENODEV; 321 } 322 323 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 324 if(module_data.dev_mixer < 0){ 325 printk(KERN_ERR "hostmixer: couldn't register mixer " 326 "device!\n"); 327 unregister_sound_dsp(module_data.dev_audio); 328 return -ENODEV; 329 } 330 331 return 0; 332 } 333 334 static void __exit hostaudio_cleanup_module (void) 335 { 336 unregister_sound_mixer(module_data.dev_mixer); 337 unregister_sound_dsp(module_data.dev_audio); 338 } 339 340 module_init(hostaudio_init_module); 341 module_exit(hostaudio_cleanup_module); 342 343 /* 344 * Overrides for Emacs so that we follow Linus's tabbing style. 345 * Emacs will notice this stuff at the end of the file and automatically 346 * adjust the settings for this buffer only. This must remain at the end 347 * of the file. 348 * --------------------------------------------------------------------------- 349 * Local variables: 350 * c-file-style: "linux" 351 * End: 352 */ 353