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 *add = 0; 52 dsp = name; 53 return 0; 54 } 55 56 __uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP); 57 58 static int set_mixer(char *name, int *add) 59 { 60 *add = 0; 61 mixer = name; 62 return 0; 63 } 64 65 __uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP); 66 #endif 67 68 static DEFINE_MUTEX(hostaudio_mutex); 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(KERN_DEBUG "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(KERN_DEBUG "hostaudio: write called, count = %d\n", count); 108 #endif 109 110 kbuf = memdup_user(buffer, count); 111 if (IS_ERR(kbuf)) 112 return PTR_ERR(kbuf); 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 } 123 124 static __poll_t hostaudio_poll(struct file *file, 125 struct poll_table_struct *wait) 126 { 127 #ifdef DEBUG 128 printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n"); 129 #endif 130 131 return 0; 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 .read = hostaudio_read, 297 .write = hostaudio_write, 298 .poll = hostaudio_poll, 299 .unlocked_ioctl = hostaudio_ioctl, 300 .compat_ioctl = compat_ptr_ioctl, 301 .mmap = NULL, 302 .open = hostaudio_open, 303 .release = hostaudio_release, 304 }; 305 306 static const struct file_operations hostmixer_fops = { 307 .owner = THIS_MODULE, 308 .unlocked_ioctl = hostmixer_ioctl_mixdev, 309 .open = hostmixer_open_mixdev, 310 .release = hostmixer_release, 311 }; 312 313 static 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