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