1 /* 2 * Copyright (C) 2002 Steve Schmidtke 3 * Licensed under the GPL 4 */ 5 6 #include "linux/module.h" 7 #include "linux/init.h" 8 #include "linux/slab.h" 9 #include "linux/fs.h" 10 #include "linux/sound.h" 11 #include "linux/soundcard.h" 12 #include "asm/uaccess.h" 13 #include "kern_util.h" 14 #include "init.h" 15 #include "os.h" 16 17 struct hostaudio_state { 18 int fd; 19 }; 20 21 struct hostmixer_state { 22 int fd; 23 }; 24 25 #define HOSTAUDIO_DEV_DSP "/dev/sound/dsp" 26 #define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer" 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("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("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("hostaudio: poll called (unimplemented)\n"); 135 #endif 136 137 return(mask); 138 } 139 140 static int hostaudio_ioctl(struct inode *inode, 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("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("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) r = 1; 198 if(file->f_mode & FMODE_WRITE) w = 1; 199 200 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 201 if(ret < 0){ 202 kfree(state); 203 return(ret); 204 } 205 state->fd = ret; 206 file->private_data = state; 207 return(0); 208 } 209 210 static int hostaudio_release(struct inode *inode, struct file *file) 211 { 212 struct hostaudio_state *state = file->private_data; 213 214 #ifdef DEBUG 215 printk("hostaudio: release called\n"); 216 #endif 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 /* kernel module operations */ 281 282 static const struct file_operations hostaudio_fops = { 283 .owner = THIS_MODULE, 284 .llseek = no_llseek, 285 .read = hostaudio_read, 286 .write = hostaudio_write, 287 .poll = hostaudio_poll, 288 .ioctl = hostaudio_ioctl, 289 .mmap = NULL, 290 .open = hostaudio_open, 291 .release = hostaudio_release, 292 }; 293 294 static const struct file_operations hostmixer_fops = { 295 .owner = THIS_MODULE, 296 .llseek = no_llseek, 297 .ioctl = hostmixer_ioctl_mixdev, 298 .open = hostmixer_open_mixdev, 299 .release = hostmixer_release, 300 }; 301 302 struct { 303 int dev_audio; 304 int dev_mixer; 305 } module_data; 306 307 MODULE_AUTHOR("Steve Schmidtke"); 308 MODULE_DESCRIPTION("UML Audio Relay"); 309 MODULE_LICENSE("GPL"); 310 311 static int __init hostaudio_init_module(void) 312 { 313 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 314 dsp, mixer); 315 316 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 317 if(module_data.dev_audio < 0){ 318 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 319 return -ENODEV; 320 } 321 322 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 323 if(module_data.dev_mixer < 0){ 324 printk(KERN_ERR "hostmixer: couldn't register mixer " 325 "device!\n"); 326 unregister_sound_dsp(module_data.dev_audio); 327 return -ENODEV; 328 } 329 330 return 0; 331 } 332 333 static void __exit hostaudio_cleanup_module (void) 334 { 335 unregister_sound_mixer(module_data.dev_mixer); 336 unregister_sound_dsp(module_data.dev_audio); 337 } 338 339 module_init(hostaudio_init_module); 340 module_exit(hostaudio_cleanup_module); 341