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 16struct hostaudio_state { 17 int fd; 18}; 19 20struct 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 */ 32static char *dsp = HOSTAUDIO_DEV_DSP; 33static 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 43module_param(dsp, charp, 0644); 44MODULE_PARM_DESC(dsp, DSP_HELP); 45module_param(mixer, charp, 0644); 46MODULE_PARM_DESC(mixer, MIXER_HELP); 47 48#ifndef MODULE 49static 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 57static 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/* /dev/dsp file operations */ 67 68static ssize_t hostaudio_read(struct file *file, char __user *buffer, 69 size_t count, loff_t *ppos) 70{ 71 struct hostaudio_state *state = file->private_data; 72 void *kbuf; 73 int err; 74 75#ifdef DEBUG 76 printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count); 77#endif 78 79 kbuf = kmalloc(count, GFP_KERNEL); 80 if (kbuf == NULL) 81 return -ENOMEM; 82 83 err = os_read_file(state->fd, kbuf, count); 84 if (err < 0) 85 goto out; 86 87 if (copy_to_user(buffer, kbuf, err)) 88 err = -EFAULT; 89 90out: 91 kfree(kbuf); 92 return err; 93} 94 95static ssize_t hostaudio_write(struct file *file, const char __user *buffer, 96 size_t count, loff_t *ppos) 97{ 98 struct hostaudio_state *state = file->private_data; 99 void *kbuf; 100 int err; 101 102#ifdef DEBUG 103 printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count); 104#endif 105 106 kbuf = kmalloc(count, GFP_KERNEL); 107 if (kbuf == NULL) 108 return -ENOMEM; 109 110 err = -EFAULT; 111 if (copy_from_user(kbuf, buffer, count)) 112 goto out; 113 114 err = os_write_file(state->fd, kbuf, count); 115 if (err < 0) 116 goto out; 117 *ppos += err; 118 119 out: 120 kfree(kbuf); 121 return err; 122} 123 124static unsigned int hostaudio_poll(struct file *file, 125 struct poll_table_struct *wait) 126{ 127 unsigned int mask = 0; 128 129#ifdef DEBUG 130 printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); 131#endif 132 133 return mask; 134} 135 136static long hostaudio_ioctl(struct file *file, 137 unsigned int cmd, unsigned long arg) 138{ 139 struct hostaudio_state *state = file->private_data; 140 unsigned long data = 0; 141 int err; 142 143#ifdef DEBUG 144 printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); 145#endif 146 switch(cmd){ 147 case SNDCTL_DSP_SPEED: 148 case SNDCTL_DSP_STEREO: 149 case SNDCTL_DSP_GETBLKSIZE: 150 case SNDCTL_DSP_CHANNELS: 151 case SNDCTL_DSP_SUBDIVIDE: 152 case SNDCTL_DSP_SETFRAGMENT: 153 if (get_user(data, (int __user *) arg)) 154 return -EFAULT; 155 break; 156 default: 157 break; 158 } 159 160 err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data); 161 162 switch(cmd){ 163 case SNDCTL_DSP_SPEED: 164 case SNDCTL_DSP_STEREO: 165 case SNDCTL_DSP_GETBLKSIZE: 166 case SNDCTL_DSP_CHANNELS: 167 case SNDCTL_DSP_SUBDIVIDE: 168 case SNDCTL_DSP_SETFRAGMENT: 169 if (put_user(data, (int __user *) arg)) 170 return -EFAULT; 171 break; 172 default: 173 break; 174 } 175 176 return err; 177} 178 179static int hostaudio_open(struct inode *inode, struct file *file) 180{ 181 struct hostaudio_state *state; 182 int r = 0, w = 0; 183 int ret; 184 185#ifdef DEBUG 186 kparam_block_sysfs_write(dsp); 187 printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); 188 kparam_unblock_sysfs_write(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) 196 r = 1; 197 if (file->f_mode & FMODE_WRITE) 198 w = 1; 199 200 kparam_block_sysfs_write(dsp); 201 lock_kernel(); 202 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 203 unlock_kernel(); 204 kparam_unblock_sysfs_write(dsp); 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 215static 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 230static 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 242static 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 kparam_block_sysfs_write(mixer); 262 lock_kernel(); 263 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); 264 unlock_kernel(); 265 kparam_unblock_sysfs_write(mixer); 266 267 if (ret < 0) { 268 kparam_block_sysfs_write(dsp); 269 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " 270 "err = %d\n", dsp, -ret); 271 kparam_unblock_sysfs_write(dsp); 272 kfree(state); 273 return ret; 274 } 275 276 file->private_data = state; 277 return 0; 278} 279 280static int hostmixer_release(struct inode *inode, struct file *file) 281{ 282 struct hostmixer_state *state = file->private_data; 283 284#ifdef DEBUG 285 printk(KERN_DEBUG "hostmixer: release called\n"); 286#endif 287 288 os_close_file(state->fd); 289 kfree(state); 290 291 return 0; 292} 293 294/* kernel module operations */ 295 296static const struct file_operations hostaudio_fops = { 297 .owner = THIS_MODULE, 298 .llseek = no_llseek, 299 .read = hostaudio_read, 300 .write = hostaudio_write, 301 .poll = hostaudio_poll, 302 .unlocked_ioctl = hostaudio_ioctl, 303 .mmap = NULL, 304 .open = hostaudio_open, 305 .release = hostaudio_release, 306}; 307 308static const struct file_operations hostmixer_fops = { 309 .owner = THIS_MODULE, 310 .llseek = no_llseek, 311 .unlocked_ioctl = hostmixer_ioctl_mixdev, 312 .open = hostmixer_open_mixdev, 313 .release = hostmixer_release, 314}; 315 316struct { 317 int dev_audio; 318 int dev_mixer; 319} module_data; 320 321MODULE_AUTHOR("Steve Schmidtke"); 322MODULE_DESCRIPTION("UML Audio Relay"); 323MODULE_LICENSE("GPL"); 324 325static int __init hostaudio_init_module(void) 326{ 327 __kernel_param_lock(); 328 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 329 dsp, mixer); 330 __kernel_param_unlock(); 331 332 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 333 if (module_data.dev_audio < 0) { 334 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 335 return -ENODEV; 336 } 337 338 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 339 if (module_data.dev_mixer < 0) { 340 printk(KERN_ERR "hostmixer: couldn't register mixer " 341 "device!\n"); 342 unregister_sound_dsp(module_data.dev_audio); 343 return -ENODEV; 344 } 345 346 return 0; 347} 348 349static void __exit hostaudio_cleanup_module (void) 350{ 351 unregister_sound_mixer(module_data.dev_mixer); 352 unregister_sound_dsp(module_data.dev_audio); 353} 354 355module_init(hostaudio_init_module); 356module_exit(hostaudio_cleanup_module); 357