1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2002 Steve Schmidtke 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 <linux/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 = memdup_user(buffer, count); 109 if (IS_ERR(kbuf)) 110 return PTR_ERR(kbuf); 111 112 err = os_write_file(state->fd, kbuf, count); 113 if (err < 0) 114 goto out; 115 *ppos += err; 116 117 out: 118 kfree(kbuf); 119 return err; 120 } 121 122 static __poll_t hostaudio_poll(struct file *file, 123 struct poll_table_struct *wait) 124 { 125 __poll_t mask = 0; 126 127 #ifdef DEBUG 128 printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); 129 #endif 130 131 return mask; 132 } 133 134 static long hostaudio_ioctl(struct file *file, 135 unsigned int cmd, unsigned long arg) 136 { 137 struct hostaudio_state *state = file->private_data; 138 unsigned long data = 0; 139 int err; 140 141 #ifdef DEBUG 142 printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd); 143 #endif 144 switch(cmd){ 145 case SNDCTL_DSP_SPEED: 146 case SNDCTL_DSP_STEREO: 147 case SNDCTL_DSP_GETBLKSIZE: 148 case SNDCTL_DSP_CHANNELS: 149 case SNDCTL_DSP_SUBDIVIDE: 150 case SNDCTL_DSP_SETFRAGMENT: 151 if (get_user(data, (int __user *) arg)) 152 return -EFAULT; 153 break; 154 default: 155 break; 156 } 157 158 err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data); 159 160 switch(cmd){ 161 case SNDCTL_DSP_SPEED: 162 case SNDCTL_DSP_STEREO: 163 case SNDCTL_DSP_GETBLKSIZE: 164 case SNDCTL_DSP_CHANNELS: 165 case SNDCTL_DSP_SUBDIVIDE: 166 case SNDCTL_DSP_SETFRAGMENT: 167 if (put_user(data, (int __user *) arg)) 168 return -EFAULT; 169 break; 170 default: 171 break; 172 } 173 174 return err; 175 } 176 177 static int hostaudio_open(struct inode *inode, struct file *file) 178 { 179 struct hostaudio_state *state; 180 int r = 0, w = 0; 181 int ret; 182 183 #ifdef DEBUG 184 kernel_param_lock(THIS_MODULE); 185 printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp); 186 kernel_param_unlock(THIS_MODULE); 187 #endif 188 189 state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL); 190 if (state == NULL) 191 return -ENOMEM; 192 193 if (file->f_mode & FMODE_READ) 194 r = 1; 195 if (file->f_mode & FMODE_WRITE) 196 w = 1; 197 198 kernel_param_lock(THIS_MODULE); 199 mutex_lock(&hostaudio_mutex); 200 ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0); 201 mutex_unlock(&hostaudio_mutex); 202 kernel_param_unlock(THIS_MODULE); 203 204 if (ret < 0) { 205 kfree(state); 206 return ret; 207 } 208 state->fd = ret; 209 file->private_data = state; 210 return 0; 211 } 212 213 static int hostaudio_release(struct inode *inode, struct file *file) 214 { 215 struct hostaudio_state *state = file->private_data; 216 217 #ifdef DEBUG 218 printk(KERN_DEBUG "hostaudio: release called\n"); 219 #endif 220 os_close_file(state->fd); 221 kfree(state); 222 223 return 0; 224 } 225 226 /* /dev/mixer file operations */ 227 228 static long hostmixer_ioctl_mixdev(struct file *file, 229 unsigned int cmd, unsigned long arg) 230 { 231 struct hostmixer_state *state = file->private_data; 232 233 #ifdef DEBUG 234 printk(KERN_DEBUG "hostmixer: ioctl called\n"); 235 #endif 236 237 return os_ioctl_generic(state->fd, cmd, arg); 238 } 239 240 static int hostmixer_open_mixdev(struct inode *inode, struct file *file) 241 { 242 struct hostmixer_state *state; 243 int r = 0, w = 0; 244 int ret; 245 246 #ifdef DEBUG 247 printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer); 248 #endif 249 250 state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL); 251 if (state == NULL) 252 return -ENOMEM; 253 254 if (file->f_mode & FMODE_READ) 255 r = 1; 256 if (file->f_mode & FMODE_WRITE) 257 w = 1; 258 259 kernel_param_lock(THIS_MODULE); 260 mutex_lock(&hostaudio_mutex); 261 ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0); 262 mutex_unlock(&hostaudio_mutex); 263 kernel_param_unlock(THIS_MODULE); 264 265 if (ret < 0) { 266 kernel_param_lock(THIS_MODULE); 267 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', " 268 "err = %d\n", dsp, -ret); 269 kernel_param_unlock(THIS_MODULE); 270 kfree(state); 271 return ret; 272 } 273 274 file->private_data = state; 275 return 0; 276 } 277 278 static int hostmixer_release(struct inode *inode, struct file *file) 279 { 280 struct hostmixer_state *state = file->private_data; 281 282 #ifdef DEBUG 283 printk(KERN_DEBUG "hostmixer: release called\n"); 284 #endif 285 286 os_close_file(state->fd); 287 kfree(state); 288 289 return 0; 290 } 291 292 /* kernel module operations */ 293 294 static const struct file_operations hostaudio_fops = { 295 .owner = THIS_MODULE, 296 .llseek = no_llseek, 297 .read = hostaudio_read, 298 .write = hostaudio_write, 299 .poll = hostaudio_poll, 300 .unlocked_ioctl = hostaudio_ioctl, 301 .compat_ioctl = compat_ptr_ioctl, 302 .mmap = NULL, 303 .open = hostaudio_open, 304 .release = hostaudio_release, 305 }; 306 307 static const struct file_operations hostmixer_fops = { 308 .owner = THIS_MODULE, 309 .llseek = no_llseek, 310 .unlocked_ioctl = hostmixer_ioctl_mixdev, 311 .open = hostmixer_open_mixdev, 312 .release = hostmixer_release, 313 }; 314 315 struct { 316 int dev_audio; 317 int dev_mixer; 318 } module_data; 319 320 MODULE_AUTHOR("Steve Schmidtke"); 321 MODULE_DESCRIPTION("UML Audio Relay"); 322 MODULE_LICENSE("GPL"); 323 324 static int __init hostaudio_init_module(void) 325 { 326 kernel_param_lock(THIS_MODULE); 327 printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n", 328 dsp, mixer); 329 kernel_param_unlock(THIS_MODULE); 330 331 module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1); 332 if (module_data.dev_audio < 0) { 333 printk(KERN_ERR "hostaudio: couldn't register DSP device!\n"); 334 return -ENODEV; 335 } 336 337 module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1); 338 if (module_data.dev_mixer < 0) { 339 printk(KERN_ERR "hostmixer: couldn't register mixer " 340 "device!\n"); 341 unregister_sound_dsp(module_data.dev_audio); 342 return -ENODEV; 343 } 344 345 return 0; 346 } 347 348 static void __exit hostaudio_cleanup_module (void) 349 { 350 unregister_sound_mixer(module_data.dev_mixer); 351 unregister_sound_dsp(module_data.dev_audio); 352 } 353 354 module_init(hostaudio_init_module); 355 module_exit(hostaudio_cleanup_module); 356