1 /* 2 * Video capture interface for Linux version 2 3 * 4 * A generic video device interface for the LINUX operating system 5 * using a set of device structures/vectors for low level operations. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 * 12 * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1) 13 * Mauro Carvalho Chehab <mchehab@kernel.org> (version 2) 14 * 15 * Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com> 16 * - Added procfs support 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/module.h> 22 #include <linux/types.h> 23 #include <linux/kernel.h> 24 #include <linux/mm.h> 25 #include <linux/string.h> 26 #include <linux/errno.h> 27 #include <linux/init.h> 28 #include <linux/kmod.h> 29 #include <linux/slab.h> 30 #include <linux/uaccess.h> 31 32 #include <media/v4l2-common.h> 33 #include <media/v4l2-device.h> 34 #include <media/v4l2-ioctl.h> 35 36 #define VIDEO_NUM_DEVICES 256 37 #define VIDEO_NAME "video4linux" 38 39 #define dprintk(fmt, arg...) do { \ 40 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 41 __func__, ##arg); \ 42 } while (0) 43 44 45 /* 46 * sysfs stuff 47 */ 48 49 static ssize_t index_show(struct device *cd, 50 struct device_attribute *attr, char *buf) 51 { 52 struct video_device *vdev = to_video_device(cd); 53 54 return sprintf(buf, "%i\n", vdev->index); 55 } 56 static DEVICE_ATTR_RO(index); 57 58 static ssize_t dev_debug_show(struct device *cd, 59 struct device_attribute *attr, char *buf) 60 { 61 struct video_device *vdev = to_video_device(cd); 62 63 return sprintf(buf, "%i\n", vdev->dev_debug); 64 } 65 66 static ssize_t dev_debug_store(struct device *cd, struct device_attribute *attr, 67 const char *buf, size_t len) 68 { 69 struct video_device *vdev = to_video_device(cd); 70 int res = 0; 71 u16 value; 72 73 res = kstrtou16(buf, 0, &value); 74 if (res) 75 return res; 76 77 vdev->dev_debug = value; 78 return len; 79 } 80 static DEVICE_ATTR_RW(dev_debug); 81 82 static ssize_t name_show(struct device *cd, 83 struct device_attribute *attr, char *buf) 84 { 85 struct video_device *vdev = to_video_device(cd); 86 87 return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); 88 } 89 static DEVICE_ATTR_RO(name); 90 91 static struct attribute *video_device_attrs[] = { 92 &dev_attr_name.attr, 93 &dev_attr_dev_debug.attr, 94 &dev_attr_index.attr, 95 NULL, 96 }; 97 ATTRIBUTE_GROUPS(video_device); 98 99 /* 100 * Active devices 101 */ 102 static struct video_device *video_devices[VIDEO_NUM_DEVICES]; 103 static DEFINE_MUTEX(videodev_lock); 104 static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); 105 106 /* Device node utility functions */ 107 108 /* Note: these utility functions all assume that vfl_type is in the range 109 [0, VFL_TYPE_MAX-1]. */ 110 111 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 112 /* Return the bitmap corresponding to vfl_type. */ 113 static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type) 114 { 115 /* Any types not assigned to fixed minor ranges must be mapped to 116 one single bitmap for the purposes of finding a free node number 117 since all those unassigned types use the same minor range. */ 118 int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type; 119 120 return devnode_nums[idx]; 121 } 122 #else 123 /* Return the bitmap corresponding to vfl_type. */ 124 static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type) 125 { 126 return devnode_nums[vfl_type]; 127 } 128 #endif 129 130 /* Mark device node number vdev->num as used */ 131 static inline void devnode_set(struct video_device *vdev) 132 { 133 set_bit(vdev->num, devnode_bits(vdev->vfl_type)); 134 } 135 136 /* Mark device node number vdev->num as unused */ 137 static inline void devnode_clear(struct video_device *vdev) 138 { 139 clear_bit(vdev->num, devnode_bits(vdev->vfl_type)); 140 } 141 142 /* Try to find a free device node number in the range [from, to> */ 143 static inline int devnode_find(struct video_device *vdev, int from, int to) 144 { 145 return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from); 146 } 147 148 struct video_device *video_device_alloc(void) 149 { 150 return kzalloc(sizeof(struct video_device), GFP_KERNEL); 151 } 152 EXPORT_SYMBOL(video_device_alloc); 153 154 void video_device_release(struct video_device *vdev) 155 { 156 kfree(vdev); 157 } 158 EXPORT_SYMBOL(video_device_release); 159 160 void video_device_release_empty(struct video_device *vdev) 161 { 162 /* Do nothing */ 163 /* Only valid when the video_device struct is a static. */ 164 } 165 EXPORT_SYMBOL(video_device_release_empty); 166 167 static inline void video_get(struct video_device *vdev) 168 { 169 get_device(&vdev->dev); 170 } 171 172 static inline void video_put(struct video_device *vdev) 173 { 174 put_device(&vdev->dev); 175 } 176 177 /* Called when the last user of the video device exits. */ 178 static void v4l2_device_release(struct device *cd) 179 { 180 struct video_device *vdev = to_video_device(cd); 181 struct v4l2_device *v4l2_dev = vdev->v4l2_dev; 182 183 mutex_lock(&videodev_lock); 184 if (WARN_ON(video_devices[vdev->minor] != vdev)) { 185 /* should not happen */ 186 mutex_unlock(&videodev_lock); 187 return; 188 } 189 190 /* Free up this device for reuse */ 191 video_devices[vdev->minor] = NULL; 192 193 /* Delete the cdev on this minor as well */ 194 cdev_del(vdev->cdev); 195 /* Just in case some driver tries to access this from 196 the release() callback. */ 197 vdev->cdev = NULL; 198 199 /* Mark device node number as free */ 200 devnode_clear(vdev); 201 202 mutex_unlock(&videodev_lock); 203 204 #if defined(CONFIG_MEDIA_CONTROLLER) 205 if (v4l2_dev->mdev) { 206 /* Remove interfaces and interface links */ 207 media_devnode_remove(vdev->intf_devnode); 208 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) 209 media_device_unregister_entity(&vdev->entity); 210 } 211 #endif 212 213 /* Do not call v4l2_device_put if there is no release callback set. 214 * Drivers that have no v4l2_device release callback might free the 215 * v4l2_dev instance in the video_device release callback below, so we 216 * must perform this check here. 217 * 218 * TODO: In the long run all drivers that use v4l2_device should use the 219 * v4l2_device release callback. This check will then be unnecessary. 220 */ 221 if (v4l2_dev->release == NULL) 222 v4l2_dev = NULL; 223 224 /* Release video_device and perform other 225 cleanups as needed. */ 226 vdev->release(vdev); 227 228 /* Decrease v4l2_device refcount */ 229 if (v4l2_dev) 230 v4l2_device_put(v4l2_dev); 231 } 232 233 static struct class video_class = { 234 .name = VIDEO_NAME, 235 .dev_groups = video_device_groups, 236 }; 237 238 struct video_device *video_devdata(struct file *file) 239 { 240 return video_devices[iminor(file_inode(file))]; 241 } 242 EXPORT_SYMBOL(video_devdata); 243 244 245 /* Priority handling */ 246 247 static inline bool prio_is_valid(enum v4l2_priority prio) 248 { 249 return prio == V4L2_PRIORITY_BACKGROUND || 250 prio == V4L2_PRIORITY_INTERACTIVE || 251 prio == V4L2_PRIORITY_RECORD; 252 } 253 254 void v4l2_prio_init(struct v4l2_prio_state *global) 255 { 256 memset(global, 0, sizeof(*global)); 257 } 258 EXPORT_SYMBOL(v4l2_prio_init); 259 260 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, 261 enum v4l2_priority new) 262 { 263 if (!prio_is_valid(new)) 264 return -EINVAL; 265 if (*local == new) 266 return 0; 267 268 atomic_inc(&global->prios[new]); 269 if (prio_is_valid(*local)) 270 atomic_dec(&global->prios[*local]); 271 *local = new; 272 return 0; 273 } 274 EXPORT_SYMBOL(v4l2_prio_change); 275 276 void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) 277 { 278 v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT); 279 } 280 EXPORT_SYMBOL(v4l2_prio_open); 281 282 void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local) 283 { 284 if (prio_is_valid(local)) 285 atomic_dec(&global->prios[local]); 286 } 287 EXPORT_SYMBOL(v4l2_prio_close); 288 289 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) 290 { 291 if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) 292 return V4L2_PRIORITY_RECORD; 293 if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) 294 return V4L2_PRIORITY_INTERACTIVE; 295 if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) 296 return V4L2_PRIORITY_BACKGROUND; 297 return V4L2_PRIORITY_UNSET; 298 } 299 EXPORT_SYMBOL(v4l2_prio_max); 300 301 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local) 302 { 303 return (local < v4l2_prio_max(global)) ? -EBUSY : 0; 304 } 305 EXPORT_SYMBOL(v4l2_prio_check); 306 307 308 static ssize_t v4l2_read(struct file *filp, char __user *buf, 309 size_t sz, loff_t *off) 310 { 311 struct video_device *vdev = video_devdata(filp); 312 int ret = -ENODEV; 313 314 if (!vdev->fops->read) 315 return -EINVAL; 316 if (video_is_registered(vdev)) 317 ret = vdev->fops->read(filp, buf, sz, off); 318 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && 319 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) 320 dprintk("%s: read: %zd (%d)\n", 321 video_device_node_name(vdev), sz, ret); 322 return ret; 323 } 324 325 static ssize_t v4l2_write(struct file *filp, const char __user *buf, 326 size_t sz, loff_t *off) 327 { 328 struct video_device *vdev = video_devdata(filp); 329 int ret = -ENODEV; 330 331 if (!vdev->fops->write) 332 return -EINVAL; 333 if (video_is_registered(vdev)) 334 ret = vdev->fops->write(filp, buf, sz, off); 335 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && 336 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) 337 dprintk("%s: write: %zd (%d)\n", 338 video_device_node_name(vdev), sz, ret); 339 return ret; 340 } 341 342 static __poll_t v4l2_poll(struct file *filp, struct poll_table_struct *poll) 343 { 344 struct video_device *vdev = video_devdata(filp); 345 __poll_t res = EPOLLERR | EPOLLHUP; 346 347 if (!vdev->fops->poll) 348 return DEFAULT_POLLMASK; 349 if (video_is_registered(vdev)) 350 res = vdev->fops->poll(filp, poll); 351 if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL) 352 dprintk("%s: poll: %08x\n", 353 video_device_node_name(vdev), res); 354 return res; 355 } 356 357 static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 358 { 359 struct video_device *vdev = video_devdata(filp); 360 int ret = -ENODEV; 361 362 if (vdev->fops->unlocked_ioctl) { 363 if (video_is_registered(vdev)) 364 ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); 365 } else 366 ret = -ENOTTY; 367 368 return ret; 369 } 370 371 #ifdef CONFIG_MMU 372 #define v4l2_get_unmapped_area NULL 373 #else 374 static unsigned long v4l2_get_unmapped_area(struct file *filp, 375 unsigned long addr, unsigned long len, unsigned long pgoff, 376 unsigned long flags) 377 { 378 struct video_device *vdev = video_devdata(filp); 379 int ret; 380 381 if (!vdev->fops->get_unmapped_area) 382 return -ENOSYS; 383 if (!video_is_registered(vdev)) 384 return -ENODEV; 385 ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); 386 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) 387 dprintk("%s: get_unmapped_area (%d)\n", 388 video_device_node_name(vdev), ret); 389 return ret; 390 } 391 #endif 392 393 static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) 394 { 395 struct video_device *vdev = video_devdata(filp); 396 int ret = -ENODEV; 397 398 if (!vdev->fops->mmap) 399 return -ENODEV; 400 if (video_is_registered(vdev)) 401 ret = vdev->fops->mmap(filp, vm); 402 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) 403 dprintk("%s: mmap (%d)\n", 404 video_device_node_name(vdev), ret); 405 return ret; 406 } 407 408 /* Override for the open function */ 409 static int v4l2_open(struct inode *inode, struct file *filp) 410 { 411 struct video_device *vdev; 412 int ret = 0; 413 414 /* Check if the video device is available */ 415 mutex_lock(&videodev_lock); 416 vdev = video_devdata(filp); 417 /* return ENODEV if the video device has already been removed. */ 418 if (vdev == NULL || !video_is_registered(vdev)) { 419 mutex_unlock(&videodev_lock); 420 return -ENODEV; 421 } 422 /* and increase the device refcount */ 423 video_get(vdev); 424 mutex_unlock(&videodev_lock); 425 if (vdev->fops->open) { 426 if (video_is_registered(vdev)) 427 ret = vdev->fops->open(filp); 428 else 429 ret = -ENODEV; 430 } 431 432 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) 433 dprintk("%s: open (%d)\n", 434 video_device_node_name(vdev), ret); 435 /* decrease the refcount in case of an error */ 436 if (ret) 437 video_put(vdev); 438 return ret; 439 } 440 441 /* Override for the release function */ 442 static int v4l2_release(struct inode *inode, struct file *filp) 443 { 444 struct video_device *vdev = video_devdata(filp); 445 int ret = 0; 446 447 if (vdev->fops->release) 448 ret = vdev->fops->release(filp); 449 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) 450 dprintk("%s: release\n", 451 video_device_node_name(vdev)); 452 453 /* decrease the refcount unconditionally since the release() 454 return value is ignored. */ 455 video_put(vdev); 456 return ret; 457 } 458 459 static const struct file_operations v4l2_fops = { 460 .owner = THIS_MODULE, 461 .read = v4l2_read, 462 .write = v4l2_write, 463 .open = v4l2_open, 464 .get_unmapped_area = v4l2_get_unmapped_area, 465 .mmap = v4l2_mmap, 466 .unlocked_ioctl = v4l2_ioctl, 467 #ifdef CONFIG_COMPAT 468 .compat_ioctl = v4l2_compat_ioctl32, 469 #endif 470 .release = v4l2_release, 471 .poll = v4l2_poll, 472 .llseek = no_llseek, 473 }; 474 475 /** 476 * get_index - assign stream index number based on v4l2_dev 477 * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned 478 * 479 * Note that when this is called the new device has not yet been registered 480 * in the video_device array, but it was able to obtain a minor number. 481 * 482 * This means that we can always obtain a free stream index number since 483 * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in 484 * use of the video_device array. 485 * 486 * Returns a free index number. 487 */ 488 static int get_index(struct video_device *vdev) 489 { 490 /* This can be static since this function is called with the global 491 videodev_lock held. */ 492 static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); 493 int i; 494 495 bitmap_zero(used, VIDEO_NUM_DEVICES); 496 497 for (i = 0; i < VIDEO_NUM_DEVICES; i++) { 498 if (video_devices[i] != NULL && 499 video_devices[i]->v4l2_dev == vdev->v4l2_dev) { 500 set_bit(video_devices[i]->index, used); 501 } 502 } 503 504 return find_first_zero_bit(used, VIDEO_NUM_DEVICES); 505 } 506 507 #define SET_VALID_IOCTL(ops, cmd, op) \ 508 if (ops->op) \ 509 set_bit(_IOC_NR(cmd), valid_ioctls) 510 511 /* This determines which ioctls are actually implemented in the driver. 512 It's a one-time thing which simplifies video_ioctl2 as it can just do 513 a bit test. 514 515 Note that drivers can override this by setting bits to 1 in 516 vdev->valid_ioctls. If an ioctl is marked as 1 when this function is 517 called, then that ioctl will actually be marked as unimplemented. 518 519 It does that by first setting up the local valid_ioctls bitmap, and 520 at the end do a: 521 522 vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) 523 */ 524 static void determine_valid_ioctls(struct video_device *vdev) 525 { 526 DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); 527 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; 528 bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER; 529 bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; 530 bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; 531 bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR; 532 bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH; 533 bool is_rx = vdev->vfl_dir != VFL_DIR_TX; 534 bool is_tx = vdev->vfl_dir != VFL_DIR_RX; 535 536 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); 537 538 /* vfl_type and vfl_dir independent ioctls */ 539 540 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); 541 set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); 542 set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); 543 544 /* Note: the control handler can also be passed through the filehandle, 545 and that can't be tested here. If the bit for these control ioctls 546 is set, then the ioctl is valid. But if it is 0, then it can still 547 be valid if the filehandle passed the control handler. */ 548 if (vdev->ctrl_handler || ops->vidioc_queryctrl) 549 set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); 550 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl) 551 set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls); 552 if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) 553 set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); 554 if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) 555 set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); 556 if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) 557 set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); 558 if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) 559 set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); 560 if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) 561 set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); 562 if (vdev->ctrl_handler || ops->vidioc_querymenu) 563 set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); 564 SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); 565 SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); 566 SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); 567 #ifdef CONFIG_VIDEO_ADV_DEBUG 568 set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls); 569 set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls); 570 set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls); 571 #endif 572 /* yes, really vidioc_subscribe_event */ 573 SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); 574 SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); 575 SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); 576 if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) 577 set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); 578 579 if (is_vid || is_tch) { 580 /* video and metadata specific ioctls */ 581 if ((is_rx && (ops->vidioc_enum_fmt_vid_cap || 582 ops->vidioc_enum_fmt_vid_cap_mplane || 583 ops->vidioc_enum_fmt_vid_overlay || 584 ops->vidioc_enum_fmt_meta_cap)) || 585 (is_tx && (ops->vidioc_enum_fmt_vid_out || 586 ops->vidioc_enum_fmt_vid_out_mplane))) 587 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 588 if ((is_rx && (ops->vidioc_g_fmt_vid_cap || 589 ops->vidioc_g_fmt_vid_cap_mplane || 590 ops->vidioc_g_fmt_vid_overlay || 591 ops->vidioc_g_fmt_meta_cap)) || 592 (is_tx && (ops->vidioc_g_fmt_vid_out || 593 ops->vidioc_g_fmt_vid_out_mplane || 594 ops->vidioc_g_fmt_vid_out_overlay))) 595 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 596 if ((is_rx && (ops->vidioc_s_fmt_vid_cap || 597 ops->vidioc_s_fmt_vid_cap_mplane || 598 ops->vidioc_s_fmt_vid_overlay || 599 ops->vidioc_s_fmt_meta_cap)) || 600 (is_tx && (ops->vidioc_s_fmt_vid_out || 601 ops->vidioc_s_fmt_vid_out_mplane || 602 ops->vidioc_s_fmt_vid_out_overlay))) 603 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 604 if ((is_rx && (ops->vidioc_try_fmt_vid_cap || 605 ops->vidioc_try_fmt_vid_cap_mplane || 606 ops->vidioc_try_fmt_vid_overlay || 607 ops->vidioc_try_fmt_meta_cap)) || 608 (is_tx && (ops->vidioc_try_fmt_vid_out || 609 ops->vidioc_try_fmt_vid_out_mplane || 610 ops->vidioc_try_fmt_vid_out_overlay))) 611 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 612 SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); 613 SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); 614 SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); 615 SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); 616 SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); 617 SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); 618 SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); 619 SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); 620 SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); 621 SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); 622 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); 623 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); 624 if (ops->vidioc_g_crop || ops->vidioc_g_selection) 625 set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); 626 if (ops->vidioc_s_crop || ops->vidioc_s_selection) 627 set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); 628 SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); 629 SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); 630 if (ops->vidioc_cropcap || ops->vidioc_g_selection) 631 set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); 632 } else if (is_vbi) { 633 /* vbi specific ioctls */ 634 if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || 635 ops->vidioc_g_fmt_sliced_vbi_cap)) || 636 (is_tx && (ops->vidioc_g_fmt_vbi_out || 637 ops->vidioc_g_fmt_sliced_vbi_out))) 638 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 639 if ((is_rx && (ops->vidioc_s_fmt_vbi_cap || 640 ops->vidioc_s_fmt_sliced_vbi_cap)) || 641 (is_tx && (ops->vidioc_s_fmt_vbi_out || 642 ops->vidioc_s_fmt_sliced_vbi_out))) 643 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 644 if ((is_rx && (ops->vidioc_try_fmt_vbi_cap || 645 ops->vidioc_try_fmt_sliced_vbi_cap)) || 646 (is_tx && (ops->vidioc_try_fmt_vbi_out || 647 ops->vidioc_try_fmt_sliced_vbi_out))) 648 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 649 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); 650 } else if (is_sdr && is_rx) { 651 /* SDR receiver specific ioctls */ 652 if (ops->vidioc_enum_fmt_sdr_cap) 653 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 654 if (ops->vidioc_g_fmt_sdr_cap) 655 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 656 if (ops->vidioc_s_fmt_sdr_cap) 657 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 658 if (ops->vidioc_try_fmt_sdr_cap) 659 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 660 } else if (is_sdr && is_tx) { 661 /* SDR transmitter specific ioctls */ 662 if (ops->vidioc_enum_fmt_sdr_out) 663 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 664 if (ops->vidioc_g_fmt_sdr_out) 665 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 666 if (ops->vidioc_s_fmt_sdr_out) 667 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 668 if (ops->vidioc_try_fmt_sdr_out) 669 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 670 } 671 672 if (is_vid || is_vbi || is_sdr || is_tch) { 673 /* ioctls valid for video, metadata, vbi or sdr */ 674 SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); 675 SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); 676 SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); 677 SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); 678 SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); 679 SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); 680 SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); 681 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); 682 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); 683 } 684 685 if (is_vid || is_vbi || is_tch) { 686 /* ioctls valid for video or vbi */ 687 if (ops->vidioc_s_std) 688 set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); 689 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); 690 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); 691 if (is_rx) { 692 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); 693 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); 694 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); 695 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); 696 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); 697 SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); 698 SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); 699 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); 700 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); 701 } 702 if (is_tx) { 703 SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); 704 SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); 705 SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); 706 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); 707 SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); 708 SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); 709 } 710 if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && 711 ops->vidioc_g_std)) 712 set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); 713 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); 714 SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); 715 SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); 716 SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); 717 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); 718 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid); 719 } 720 if (is_tx && (is_radio || is_sdr)) { 721 /* radio transmitter only ioctls */ 722 SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); 723 SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); 724 } 725 if (is_rx) { 726 /* receiver only ioctls */ 727 SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); 728 SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); 729 SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); 730 } 731 732 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, 733 BASE_VIDIOC_PRIVATE); 734 } 735 736 static int video_register_media_controller(struct video_device *vdev, int type) 737 { 738 #if defined(CONFIG_MEDIA_CONTROLLER) 739 u32 intf_type; 740 int ret; 741 742 if (!vdev->v4l2_dev->mdev) 743 return 0; 744 745 vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE; 746 vdev->entity.function = MEDIA_ENT_F_UNKNOWN; 747 748 switch (type) { 749 case VFL_TYPE_GRABBER: 750 intf_type = MEDIA_INTF_T_V4L_VIDEO; 751 vdev->entity.function = MEDIA_ENT_F_IO_V4L; 752 break; 753 case VFL_TYPE_VBI: 754 intf_type = MEDIA_INTF_T_V4L_VBI; 755 vdev->entity.function = MEDIA_ENT_F_IO_VBI; 756 break; 757 case VFL_TYPE_SDR: 758 intf_type = MEDIA_INTF_T_V4L_SWRADIO; 759 vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO; 760 break; 761 case VFL_TYPE_TOUCH: 762 intf_type = MEDIA_INTF_T_V4L_TOUCH; 763 vdev->entity.function = MEDIA_ENT_F_IO_V4L; 764 break; 765 case VFL_TYPE_RADIO: 766 intf_type = MEDIA_INTF_T_V4L_RADIO; 767 /* 768 * Radio doesn't have an entity at the V4L2 side to represent 769 * radio input or output. Instead, the audio input/output goes 770 * via either physical wires or ALSA. 771 */ 772 break; 773 case VFL_TYPE_SUBDEV: 774 intf_type = MEDIA_INTF_T_V4L_SUBDEV; 775 /* Entity will be created via v4l2_device_register_subdev() */ 776 break; 777 default: 778 return 0; 779 } 780 781 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { 782 vdev->entity.name = vdev->name; 783 784 /* Needed just for backward compatibility with legacy MC API */ 785 vdev->entity.info.dev.major = VIDEO_MAJOR; 786 vdev->entity.info.dev.minor = vdev->minor; 787 788 ret = media_device_register_entity(vdev->v4l2_dev->mdev, 789 &vdev->entity); 790 if (ret < 0) { 791 pr_warn("%s: media_device_register_entity failed\n", 792 __func__); 793 return ret; 794 } 795 } 796 797 vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev, 798 intf_type, 799 0, VIDEO_MAJOR, 800 vdev->minor); 801 if (!vdev->intf_devnode) { 802 media_device_unregister_entity(&vdev->entity); 803 return -ENOMEM; 804 } 805 806 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { 807 struct media_link *link; 808 809 link = media_create_intf_link(&vdev->entity, 810 &vdev->intf_devnode->intf, 811 MEDIA_LNK_FL_ENABLED); 812 if (!link) { 813 media_devnode_remove(vdev->intf_devnode); 814 media_device_unregister_entity(&vdev->entity); 815 return -ENOMEM; 816 } 817 } 818 819 /* FIXME: how to create the other interface links? */ 820 821 #endif 822 return 0; 823 } 824 825 int __video_register_device(struct video_device *vdev, 826 enum vfl_devnode_type type, 827 int nr, int warn_if_nr_in_use, 828 struct module *owner) 829 { 830 int i = 0; 831 int ret; 832 int minor_offset = 0; 833 int minor_cnt = VIDEO_NUM_DEVICES; 834 const char *name_base; 835 836 /* A minor value of -1 marks this video device as never 837 having been registered */ 838 vdev->minor = -1; 839 840 /* the release callback MUST be present */ 841 if (WARN_ON(!vdev->release)) 842 return -EINVAL; 843 /* the v4l2_dev pointer MUST be present */ 844 if (WARN_ON(!vdev->v4l2_dev)) 845 return -EINVAL; 846 847 /* v4l2_fh support */ 848 spin_lock_init(&vdev->fh_lock); 849 INIT_LIST_HEAD(&vdev->fh_list); 850 851 /* Part 1: check device type */ 852 switch (type) { 853 case VFL_TYPE_GRABBER: 854 name_base = "video"; 855 break; 856 case VFL_TYPE_VBI: 857 name_base = "vbi"; 858 break; 859 case VFL_TYPE_RADIO: 860 name_base = "radio"; 861 break; 862 case VFL_TYPE_SUBDEV: 863 name_base = "v4l-subdev"; 864 break; 865 case VFL_TYPE_SDR: 866 /* Use device name 'swradio' because 'sdr' was already taken. */ 867 name_base = "swradio"; 868 break; 869 case VFL_TYPE_TOUCH: 870 name_base = "v4l-touch"; 871 break; 872 default: 873 pr_err("%s called with unknown type: %d\n", 874 __func__, type); 875 return -EINVAL; 876 } 877 878 vdev->vfl_type = type; 879 vdev->cdev = NULL; 880 if (vdev->dev_parent == NULL) 881 vdev->dev_parent = vdev->v4l2_dev->dev; 882 if (vdev->ctrl_handler == NULL) 883 vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; 884 /* If the prio state pointer is NULL, then use the v4l2_device 885 prio state. */ 886 if (vdev->prio == NULL) 887 vdev->prio = &vdev->v4l2_dev->prio; 888 889 /* Part 2: find a free minor, device node number and device index. */ 890 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 891 /* Keep the ranges for the first four types for historical 892 * reasons. 893 * Newer devices (not yet in place) should use the range 894 * of 128-191 and just pick the first free minor there 895 * (new style). */ 896 switch (type) { 897 case VFL_TYPE_GRABBER: 898 minor_offset = 0; 899 minor_cnt = 64; 900 break; 901 case VFL_TYPE_RADIO: 902 minor_offset = 64; 903 minor_cnt = 64; 904 break; 905 case VFL_TYPE_VBI: 906 minor_offset = 224; 907 minor_cnt = 32; 908 break; 909 default: 910 minor_offset = 128; 911 minor_cnt = 64; 912 break; 913 } 914 #endif 915 916 /* Pick a device node number */ 917 mutex_lock(&videodev_lock); 918 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); 919 if (nr == minor_cnt) 920 nr = devnode_find(vdev, 0, minor_cnt); 921 if (nr == minor_cnt) { 922 pr_err("could not get a free device node number\n"); 923 mutex_unlock(&videodev_lock); 924 return -ENFILE; 925 } 926 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 927 /* 1-on-1 mapping of device node number to minor number */ 928 i = nr; 929 #else 930 /* The device node number and minor numbers are independent, so 931 we just find the first free minor number. */ 932 for (i = 0; i < VIDEO_NUM_DEVICES; i++) 933 if (video_devices[i] == NULL) 934 break; 935 if (i == VIDEO_NUM_DEVICES) { 936 mutex_unlock(&videodev_lock); 937 pr_err("could not get a free minor\n"); 938 return -ENFILE; 939 } 940 #endif 941 vdev->minor = i + minor_offset; 942 vdev->num = nr; 943 944 /* Should not happen since we thought this minor was free */ 945 if (WARN_ON(video_devices[vdev->minor])) { 946 mutex_unlock(&videodev_lock); 947 pr_err("video_device not empty!\n"); 948 return -ENFILE; 949 } 950 devnode_set(vdev); 951 vdev->index = get_index(vdev); 952 video_devices[vdev->minor] = vdev; 953 mutex_unlock(&videodev_lock); 954 955 if (vdev->ioctl_ops) 956 determine_valid_ioctls(vdev); 957 958 /* Part 3: Initialize the character device */ 959 vdev->cdev = cdev_alloc(); 960 if (vdev->cdev == NULL) { 961 ret = -ENOMEM; 962 goto cleanup; 963 } 964 vdev->cdev->ops = &v4l2_fops; 965 vdev->cdev->owner = owner; 966 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); 967 if (ret < 0) { 968 pr_err("%s: cdev_add failed\n", __func__); 969 kfree(vdev->cdev); 970 vdev->cdev = NULL; 971 goto cleanup; 972 } 973 974 /* Part 4: register the device with sysfs */ 975 vdev->dev.class = &video_class; 976 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); 977 vdev->dev.parent = vdev->dev_parent; 978 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); 979 ret = device_register(&vdev->dev); 980 if (ret < 0) { 981 pr_err("%s: device_register failed\n", __func__); 982 goto cleanup; 983 } 984 /* Register the release callback that will be called when the last 985 reference to the device goes away. */ 986 vdev->dev.release = v4l2_device_release; 987 988 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) 989 pr_warn("%s: requested %s%d, got %s\n", __func__, 990 name_base, nr, video_device_node_name(vdev)); 991 992 /* Increase v4l2_device refcount */ 993 v4l2_device_get(vdev->v4l2_dev); 994 995 /* Part 5: Register the entity. */ 996 ret = video_register_media_controller(vdev, type); 997 998 /* Part 6: Activate this minor. The char device can now be used. */ 999 set_bit(V4L2_FL_REGISTERED, &vdev->flags); 1000 1001 return 0; 1002 1003 cleanup: 1004 mutex_lock(&videodev_lock); 1005 if (vdev->cdev) 1006 cdev_del(vdev->cdev); 1007 video_devices[vdev->minor] = NULL; 1008 devnode_clear(vdev); 1009 mutex_unlock(&videodev_lock); 1010 /* Mark this video device as never having been registered. */ 1011 vdev->minor = -1; 1012 return ret; 1013 } 1014 EXPORT_SYMBOL(__video_register_device); 1015 1016 /** 1017 * video_unregister_device - unregister a video4linux device 1018 * @vdev: the device to unregister 1019 * 1020 * This unregisters the passed device. Future open calls will 1021 * be met with errors. 1022 */ 1023 void video_unregister_device(struct video_device *vdev) 1024 { 1025 /* Check if vdev was ever registered at all */ 1026 if (!vdev || !video_is_registered(vdev)) 1027 return; 1028 1029 mutex_lock(&videodev_lock); 1030 /* This must be in a critical section to prevent a race with v4l2_open. 1031 * Once this bit has been cleared video_get may never be called again. 1032 */ 1033 clear_bit(V4L2_FL_REGISTERED, &vdev->flags); 1034 mutex_unlock(&videodev_lock); 1035 device_unregister(&vdev->dev); 1036 } 1037 EXPORT_SYMBOL(video_unregister_device); 1038 1039 /* 1040 * Initialise video for linux 1041 */ 1042 static int __init videodev_init(void) 1043 { 1044 dev_t dev = MKDEV(VIDEO_MAJOR, 0); 1045 int ret; 1046 1047 pr_info("Linux video capture interface: v2.00\n"); 1048 ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); 1049 if (ret < 0) { 1050 pr_warn("videodev: unable to get major %d\n", 1051 VIDEO_MAJOR); 1052 return ret; 1053 } 1054 1055 ret = class_register(&video_class); 1056 if (ret < 0) { 1057 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); 1058 pr_warn("video_dev: class_register failed\n"); 1059 return -EIO; 1060 } 1061 1062 return 0; 1063 } 1064 1065 static void __exit videodev_exit(void) 1066 { 1067 dev_t dev = MKDEV(VIDEO_MAJOR, 0); 1068 1069 class_unregister(&video_class); 1070 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); 1071 } 1072 1073 subsys_initcall(videodev_init); 1074 module_exit(videodev_exit) 1075 1076 MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@kernel.org>"); 1077 MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); 1078 MODULE_LICENSE("GPL"); 1079 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); 1080