Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 | /* * Video capture interface for Linux * * A generic video device interface for the LINUX operating system * using a set of device structures/vectors for low level operations. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Author: Alan Cox, <alan@redhat.com> * * Fixes: */ #include <linux/config.h> #include <linux/version.h> #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/videodev.h> #if LINUX_VERSION_CODE >= 0x020100 #include <asm/uaccess.h> #endif #include <asm/system.h> #include <linux/kmod.h> #define VIDEO_NUM_DEVICES 256 /* * Active devices */ static struct video_device *video_device[VIDEO_NUM_DEVICES]; #ifdef CONFIG_VIDEO_BT848 extern int init_bttv_cards(struct video_init *); extern int i2c_tuner_init(struct video_init *); #endif #ifdef CONFIG_VIDEO_SAA5249 extern int init_saa_5249(struct video_init *); #endif #ifdef CONFIG_VIDEO_CQCAM extern int init_colour_qcams(struct video_init *); #endif #ifdef CONFIG_VIDEO_BWQCAM extern int init_bw_qcams(struct video_init *); #endif #ifdef CONFIG_VIDEO_PLANB extern int init_planbs(struct video_init *); #endif #ifdef CONFIG_RADIO_RTRACK2 extern int rtrack2_init(struct video_init *); #endif #ifdef CONFIG_RADIO_SF16FMI extern int fmi_init(struct video_init *); #endif #ifdef CONFIG_RADIO_TYPHOON extern int typhoon_init(struct video_init *); #endif #ifdef CONFIG_RADIO_CADET extern int cadet_init(struct video_init *); #endif #ifdef CONFIG_RADIO_TERRATEC extern int terratec_init(struct video_init *); #endif #ifdef CONFIG_VIDEO_ZORAN extern int init_zoran_cards(struct video_init *); #endif static struct video_init video_init_list[]={ #ifdef CONFIG_VIDEO_BT848 {"i2c-tuner", i2c_tuner_init}, {"bttv", init_bttv_cards}, #endif #ifdef CONFIG_VIDEO_SAA5249 {"saa5249", init_saa_5249}, #endif #ifdef CONFIG_VIDEO_CQCAM {"c-qcam", init_colour_qcams}, #endif #ifdef CONFIG_VIDEO_BWQCAM {"bw-qcam", init_bw_qcams}, #endif #ifdef CONFIG_VIDEO_PLANB {"planb", init_planbs}, #endif #ifdef CONFIG_RADIO_RTRACK2 {"RTrack2", rtrack2_init}, #endif #ifdef CONFIG_RADIO_SF16FMI {"SF16FMI", fmi_init}, #endif #ifdef CONFIG_RADIO_CADET {"Cadet", cadet_init}, #endif #ifdef CONFIG_RADIO_TYPHOON {"radio-typhoon", typhoon_init}, #endif #ifdef CONFIG_RADIO_TERRATEC {"radio-terratec", terratec_init}, #endif #ifdef CONFIG_VIDEO_ZORAN {"zoran", init_zoran_cards}, #endif {"end", NULL} }; /* * Read will do some smarts later on. Buffer pin etc. */ static ssize_t video_read(struct file *file, char *buf, size_t count, loff_t *ppos) { struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)]; if(vfl->read) return vfl->read(vfl, buf, count, file->f_flags&O_NONBLOCK); else return -EINVAL; } /* * Write for now does nothing. No reason it shouldnt do overlay setting * for some boards I guess.. */ static ssize_t video_write(struct file *file, const char *buf, size_t count, loff_t *ppos) { struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)]; if(vfl->write) return vfl->write(vfl, buf, count, file->f_flags&O_NONBLOCK); else return 0; } /* * Poll to see if we're readable, can probably be used for timing on incoming * frames, etc.. */ static unsigned int video_poll(struct file *file, poll_table * wait) { struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)]; if(vfl->poll) return vfl->poll(vfl, file, wait); else return 0; } /* * Open a video device. */ static int video_open(struct inode *inode, struct file *file) { unsigned int minor = MINOR(inode->i_rdev); int err; struct video_device *vfl; if(minor>=VIDEO_NUM_DEVICES) return -ENODEV; vfl=video_device[minor]; if(vfl==NULL) { char modname[20]; sprintf (modname, "char-major-%d-%d", VIDEO_MAJOR, minor); request_module(modname); vfl=video_device[minor]; if (vfl==NULL) return -ENODEV; } if(vfl->busy) return -EBUSY; vfl->busy=1; /* In case vfl->open sleeps */ if(vfl->open) { err=vfl->open(vfl,0); /* Tell the device it is open */ if(err) { vfl->busy=0; return err; } } return 0; } /* * Last close of a video for Linux device */ static int video_release(struct inode *inode, struct file *file) { struct video_device *vfl=video_device[MINOR(inode->i_rdev)]; if(vfl->close) vfl->close(vfl); vfl->busy=0; return 0; } /* * Question: Should we be able to capture and then seek around the * image ? */ #if LINUX_VERSION_CODE >= 0x020100 static long long video_lseek(struct file * file, long long offset, int origin) { return -ESPIPE; } #else static long long video_lseek(struct inode *inode, struct file * file, long long offset, int origin) { return -ESPIPE; } #endif static int video_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct video_device *vfl=video_device[MINOR(inode->i_rdev)]; int err=vfl->ioctl(vfl, cmd, (void *)arg); if(err!=-ENOIOCTLCMD) return err; switch(cmd) { default: return -EINVAL; } } /* * We need to do MMAP support */ #if LINUX_VERSION_CODE >= 0x020100 int video_mmap(struct file *file, struct vm_area_struct *vma) { struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)]; #else static int video_mmap(struct inode * ino, struct file * file, struct vm_area_struct * vma) { struct video_device *vfl=video_device[MINOR(ino->i_rdev)]; #endif if(vfl->mmap) return vfl->mmap(vfl, (char *)vma->vm_start, (unsigned long)(vma->vm_end-vma->vm_start)); return -EINVAL; } /* * Video For Linux device drivers request registration here. */ int video_register_device(struct video_device *vfd, int type) { int i=0; int base; int err; int end; switch(type) { case VFL_TYPE_GRABBER: base=0; end=64; break; case VFL_TYPE_VTX: base=192; end=224; break; case VFL_TYPE_VBI: base=224; end=240; break; case VFL_TYPE_RADIO: base=64; end=128; break; default: return -1; } for(i=base;i<end;i++) { if(video_device[i]==NULL) { video_device[i]=vfd; vfd->minor=i; /* The init call may sleep so we book the slot out then call */ MOD_INC_USE_COUNT; if(vfd->initialize) { err=vfd->initialize(vfd); if(err<0) { video_device[i]=NULL; MOD_DEC_USE_COUNT; return err; } } return 0; } } return -ENFILE; } /* * Unregister an unused video for linux device */ void video_unregister_device(struct video_device *vfd) { if(video_device[vfd->minor]!=vfd) panic("vfd: bad unregister"); video_device[vfd->minor]=NULL; MOD_DEC_USE_COUNT; } static struct file_operations video_fops= { video_lseek, video_read, video_write, NULL, /* readdir */ #if LINUX_VERSION_CODE >= 0x020100 video_poll, /* poll */ #else NULL, #endif video_ioctl, video_mmap, video_open, #if LINUX_VERSION_CODE >= 0x020100 NULL, /* flush */ #endif video_release }; /* * Initialise video for linux */ int videodev_init(void) { struct video_init *vfli = video_init_list; printk(KERN_INFO "Linux video capture interface: v1.00\n"); if(register_chrdev(VIDEO_MAJOR,"video_capture", &video_fops)) { printk("video_dev: unable to get major %d\n", VIDEO_MAJOR); return -EIO; } /* * Init kernel installed video drivers */ while(vfli->init!=NULL) { vfli->init(vfli); vfli++; } return 0; } #ifdef MODULE int init_module(void) { return videodev_init(); } void cleanup_module(void) { unregister_chrdev(VIDEO_MAJOR, "video_capture"); } #endif #if LINUX_VERSION_CODE >= 0x020100 EXPORT_SYMBOL(video_register_device); EXPORT_SYMBOL(video_unregister_device); #endif |