1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Video capture interface for Linux version 2 4 * 5 * A generic video device interface for the LINUX operating system 6 * using a set of device structures/vectors for low level operations. 7 * 8 * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1) 9 * Mauro Carvalho Chehab <mchehab@kernel.org> (version 2) 10 * 11 * Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com> 12 * - Added procfs support 13 */ 14 15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17 #include <linux/debugfs.h> 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/string.h> 23 #include <linux/errno.h> 24 #include <linux/init.h> 25 #include <linux/kmod.h> 26 #include <linux/slab.h> 27 #include <linux/uaccess.h> 28 29 #include <media/v4l2-common.h> 30 #include <media/v4l2-device.h> 31 #include <media/v4l2-ioctl.h> 32 #include <media/v4l2-event.h> 33 34 #define VIDEO_NUM_DEVICES 256 35 #define VIDEO_NAME "video4linux" 36 37 #define dprintk(fmt, arg...) do { \ 38 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 39 __func__, ##arg); \ 40 } while (0) 41 42 /* 43 * sysfs stuff 44 */ 45 46 static ssize_t index_show(struct device *cd, 47 struct device_attribute *attr, char *buf) 48 { 49 struct video_device *vdev = to_video_device(cd); 50 51 return sprintf(buf, "%i\n", vdev->index); 52 } 53 static DEVICE_ATTR_RO(index); 54 55 static ssize_t dev_debug_show(struct device *cd, 56 struct device_attribute *attr, char *buf) 57 { 58 struct video_device *vdev = to_video_device(cd); 59 60 return sprintf(buf, "%i\n", vdev->dev_debug); 61 } 62 63 static ssize_t dev_debug_store(struct device *cd, struct device_attribute *attr, 64 const char *buf, size_t len) 65 { 66 struct video_device *vdev = to_video_device(cd); 67 int res = 0; 68 u16 value; 69 70 res = kstrtou16(buf, 0, &value); 71 if (res) 72 return res; 73 74 vdev->dev_debug = value; 75 return len; 76 } 77 static DEVICE_ATTR_RW(dev_debug); 78 79 static ssize_t name_show(struct device *cd, 80 struct device_attribute *attr, char *buf) 81 { 82 struct video_device *vdev = to_video_device(cd); 83 84 return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); 85 } 86 static DEVICE_ATTR_RO(name); 87 88 static struct attribute *video_device_attrs[] = { 89 &dev_attr_name.attr, 90 &dev_attr_dev_debug.attr, 91 &dev_attr_index.attr, 92 NULL, 93 }; 94 ATTRIBUTE_GROUPS(video_device); 95 96 /* 97 * Active devices 98 */ 99 static struct video_device *video_devices[VIDEO_NUM_DEVICES]; 100 static DEFINE_MUTEX(videodev_lock); 101 static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); 102 103 /* Device node utility functions */ 104 105 /* Note: these utility functions all assume that vfl_type is in the range 106 [0, VFL_TYPE_MAX-1]. */ 107 108 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 109 /* Return the bitmap corresponding to vfl_type. */ 110 static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type) 111 { 112 /* Any types not assigned to fixed minor ranges must be mapped to 113 one single bitmap for the purposes of finding a free node number 114 since all those unassigned types use the same minor range. */ 115 int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type; 116 117 return devnode_nums[idx]; 118 } 119 #else 120 /* Return the bitmap corresponding to vfl_type. */ 121 static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type) 122 { 123 return devnode_nums[vfl_type]; 124 } 125 #endif 126 127 /* Mark device node number vdev->num as used */ 128 static inline void devnode_set(struct video_device *vdev) 129 { 130 set_bit(vdev->num, devnode_bits(vdev->vfl_type)); 131 } 132 133 /* Mark device node number vdev->num as unused */ 134 static inline void devnode_clear(struct video_device *vdev) 135 { 136 clear_bit(vdev->num, devnode_bits(vdev->vfl_type)); 137 } 138 139 /* Try to find a free device node number in the range [from, to> */ 140 static inline int devnode_find(struct video_device *vdev, int from, int to) 141 { 142 return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from); 143 } 144 145 struct video_device *video_device_alloc(void) 146 { 147 return kzalloc(sizeof(struct video_device), GFP_KERNEL); 148 } 149 EXPORT_SYMBOL(video_device_alloc); 150 151 void video_device_release(struct video_device *vdev) 152 { 153 kfree(vdev); 154 } 155 EXPORT_SYMBOL(video_device_release); 156 157 void video_device_release_empty(struct video_device *vdev) 158 { 159 /* Do nothing */ 160 /* Only valid when the video_device struct is a static. */ 161 } 162 EXPORT_SYMBOL(video_device_release_empty); 163 164 static inline void video_get(struct video_device *vdev) 165 { 166 get_device(&vdev->dev); 167 } 168 169 static inline void video_put(struct video_device *vdev) 170 { 171 put_device(&vdev->dev); 172 } 173 174 /* Called when the last user of the video device exits. */ 175 static void v4l2_device_release(struct device *cd) 176 { 177 struct video_device *vdev = to_video_device(cd); 178 struct v4l2_device *v4l2_dev = vdev->v4l2_dev; 179 180 mutex_lock(&videodev_lock); 181 if (WARN_ON(video_devices[vdev->minor] != vdev)) { 182 /* should not happen */ 183 mutex_unlock(&videodev_lock); 184 return; 185 } 186 187 /* Free up this device for reuse */ 188 video_devices[vdev->minor] = NULL; 189 190 /* Delete the cdev on this minor as well */ 191 cdev_del(vdev->cdev); 192 /* Just in case some driver tries to access this from 193 the release() callback. */ 194 vdev->cdev = NULL; 195 196 /* Mark device node number as free */ 197 devnode_clear(vdev); 198 199 mutex_unlock(&videodev_lock); 200 201 #if defined(CONFIG_MEDIA_CONTROLLER) 202 if (v4l2_dev->mdev && vdev->vfl_dir != VFL_DIR_M2M) { 203 /* Remove interfaces and interface links */ 204 media_devnode_remove(vdev->intf_devnode); 205 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) 206 media_device_unregister_entity(&vdev->entity); 207 } 208 #endif 209 210 /* Do not call v4l2_device_put if there is no release callback set. 211 * Drivers that have no v4l2_device release callback might free the 212 * v4l2_dev instance in the video_device release callback below, so we 213 * must perform this check here. 214 * 215 * TODO: In the long run all drivers that use v4l2_device should use the 216 * v4l2_device release callback. This check will then be unnecessary. 217 */ 218 if (v4l2_dev->release == NULL) 219 v4l2_dev = NULL; 220 221 /* Release video_device and perform other 222 cleanups as needed. */ 223 vdev->release(vdev); 224 225 /* Decrease v4l2_device refcount */ 226 if (v4l2_dev) 227 v4l2_device_put(v4l2_dev); 228 } 229 230 static struct class video_class = { 231 .name = VIDEO_NAME, 232 .dev_groups = video_device_groups, 233 }; 234 235 struct video_device *video_devdata(struct file *file) 236 { 237 return video_devices[iminor(file_inode(file))]; 238 } 239 EXPORT_SYMBOL(video_devdata); 240 241 242 /* Priority handling */ 243 244 static inline bool prio_is_valid(enum v4l2_priority prio) 245 { 246 return prio == V4L2_PRIORITY_BACKGROUND || 247 prio == V4L2_PRIORITY_INTERACTIVE || 248 prio == V4L2_PRIORITY_RECORD; 249 } 250 251 void v4l2_prio_init(struct v4l2_prio_state *global) 252 { 253 memset(global, 0, sizeof(*global)); 254 } 255 EXPORT_SYMBOL(v4l2_prio_init); 256 257 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, 258 enum v4l2_priority new) 259 { 260 if (!prio_is_valid(new)) 261 return -EINVAL; 262 if (*local == new) 263 return 0; 264 265 atomic_inc(&global->prios[new]); 266 if (prio_is_valid(*local)) 267 atomic_dec(&global->prios[*local]); 268 *local = new; 269 return 0; 270 } 271 EXPORT_SYMBOL(v4l2_prio_change); 272 273 void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) 274 { 275 v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT); 276 } 277 EXPORT_SYMBOL(v4l2_prio_open); 278 279 void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local) 280 { 281 if (prio_is_valid(local)) 282 atomic_dec(&global->prios[local]); 283 } 284 EXPORT_SYMBOL(v4l2_prio_close); 285 286 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) 287 { 288 if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) 289 return V4L2_PRIORITY_RECORD; 290 if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) 291 return V4L2_PRIORITY_INTERACTIVE; 292 if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) 293 return V4L2_PRIORITY_BACKGROUND; 294 return V4L2_PRIORITY_UNSET; 295 } 296 EXPORT_SYMBOL(v4l2_prio_max); 297 298 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local) 299 { 300 return (local < v4l2_prio_max(global)) ? -EBUSY : 0; 301 } 302 EXPORT_SYMBOL(v4l2_prio_check); 303 304 305 static ssize_t v4l2_read(struct file *filp, char __user *buf, 306 size_t sz, loff_t *off) 307 { 308 struct video_device *vdev = video_devdata(filp); 309 int ret = -ENODEV; 310 311 if (!vdev->fops->read) 312 return -EINVAL; 313 if (video_is_registered(vdev)) 314 ret = vdev->fops->read(filp, buf, sz, off); 315 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && 316 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) 317 dprintk("%s: read: %zd (%d)\n", 318 video_device_node_name(vdev), sz, ret); 319 return ret; 320 } 321 322 static ssize_t v4l2_write(struct file *filp, const char __user *buf, 323 size_t sz, loff_t *off) 324 { 325 struct video_device *vdev = video_devdata(filp); 326 int ret = -ENODEV; 327 328 if (!vdev->fops->write) 329 return -EINVAL; 330 if (video_is_registered(vdev)) 331 ret = vdev->fops->write(filp, buf, sz, off); 332 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && 333 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) 334 dprintk("%s: write: %zd (%d)\n", 335 video_device_node_name(vdev), sz, ret); 336 return ret; 337 } 338 339 static __poll_t v4l2_poll(struct file *filp, struct poll_table_struct *poll) 340 { 341 struct video_device *vdev = video_devdata(filp); 342 __poll_t res = EPOLLERR | EPOLLHUP | EPOLLPRI; 343 344 if (video_is_registered(vdev)) { 345 if (!vdev->fops->poll) 346 res = DEFAULT_POLLMASK; 347 else 348 res = vdev->fops->poll(filp, poll); 349 } 350 if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL) 351 dprintk("%s: poll: %08x %08x\n", 352 video_device_node_name(vdev), res, 353 poll_requested_events(poll)); 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 /* 448 * We need to serialize the release() with queueing new requests. 449 * The release() may trigger the cancellation of a streaming 450 * operation, and that should not be mixed with queueing a new 451 * request at the same time. 452 */ 453 if (vdev->fops->release) { 454 if (v4l2_device_supports_requests(vdev->v4l2_dev)) { 455 mutex_lock(&vdev->v4l2_dev->mdev->req_queue_mutex); 456 ret = vdev->fops->release(filp); 457 mutex_unlock(&vdev->v4l2_dev->mdev->req_queue_mutex); 458 } else { 459 ret = vdev->fops->release(filp); 460 } 461 } 462 463 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) 464 dprintk("%s: release\n", 465 video_device_node_name(vdev)); 466 467 /* decrease the refcount unconditionally since the release() 468 return value is ignored. */ 469 video_put(vdev); 470 return ret; 471 } 472 473 static const struct file_operations v4l2_fops = { 474 .owner = THIS_MODULE, 475 .read = v4l2_read, 476 .write = v4l2_write, 477 .open = v4l2_open, 478 .get_unmapped_area = v4l2_get_unmapped_area, 479 .mmap = v4l2_mmap, 480 .unlocked_ioctl = v4l2_ioctl, 481 #ifdef CONFIG_COMPAT 482 .compat_ioctl = v4l2_compat_ioctl32, 483 #endif 484 .release = v4l2_release, 485 .poll = v4l2_poll, 486 .llseek = no_llseek, 487 }; 488 489 /** 490 * get_index - assign stream index number based on v4l2_dev 491 * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned 492 * 493 * Note that when this is called the new device has not yet been registered 494 * in the video_device array, but it was able to obtain a minor number. 495 * 496 * This means that we can always obtain a free stream index number since 497 * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in 498 * use of the video_device array. 499 * 500 * Returns a free index number. 501 */ 502 static int get_index(struct video_device *vdev) 503 { 504 /* This can be static since this function is called with the global 505 videodev_lock held. */ 506 static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); 507 int i; 508 509 bitmap_zero(used, VIDEO_NUM_DEVICES); 510 511 for (i = 0; i < VIDEO_NUM_DEVICES; i++) { 512 if (video_devices[i] != NULL && 513 video_devices[i]->v4l2_dev == vdev->v4l2_dev) { 514 __set_bit(video_devices[i]->index, used); 515 } 516 } 517 518 return find_first_zero_bit(used, VIDEO_NUM_DEVICES); 519 } 520 521 #define SET_VALID_IOCTL(ops, cmd, op) \ 522 do { if ((ops)->op) __set_bit(_IOC_NR(cmd), valid_ioctls); } while (0) 523 524 /* This determines which ioctls are actually implemented in the driver. 525 It's a one-time thing which simplifies video_ioctl2 as it can just do 526 a bit test. 527 528 Note that drivers can override this by setting bits to 1 in 529 vdev->valid_ioctls. If an ioctl is marked as 1 when this function is 530 called, then that ioctl will actually be marked as unimplemented. 531 532 It does that by first setting up the local valid_ioctls bitmap, and 533 at the end do a: 534 535 vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) 536 */ 537 static void determine_valid_ioctls(struct video_device *vdev) 538 { 539 const u32 vid_caps = V4L2_CAP_VIDEO_CAPTURE | 540 V4L2_CAP_VIDEO_CAPTURE_MPLANE | 541 V4L2_CAP_VIDEO_OUTPUT | 542 V4L2_CAP_VIDEO_OUTPUT_MPLANE | 543 V4L2_CAP_VIDEO_M2M | V4L2_CAP_VIDEO_M2M_MPLANE; 544 const u32 meta_caps = V4L2_CAP_META_CAPTURE | 545 V4L2_CAP_META_OUTPUT; 546 DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); 547 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; 548 bool is_vid = vdev->vfl_type == VFL_TYPE_VIDEO && 549 (vdev->device_caps & vid_caps); 550 bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; 551 bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; 552 bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR; 553 bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH; 554 bool is_meta = vdev->vfl_type == VFL_TYPE_VIDEO && 555 (vdev->device_caps & meta_caps); 556 bool is_rx = vdev->vfl_dir != VFL_DIR_TX; 557 bool is_tx = vdev->vfl_dir != VFL_DIR_RX; 558 bool is_io_mc = vdev->device_caps & V4L2_CAP_IO_MC; 559 bool has_streaming = vdev->device_caps & V4L2_CAP_STREAMING; 560 561 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); 562 563 /* vfl_type and vfl_dir independent ioctls */ 564 565 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); 566 __set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); 567 __set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); 568 569 /* Note: the control handler can also be passed through the filehandle, 570 and that can't be tested here. If the bit for these control ioctls 571 is set, then the ioctl is valid. But if it is 0, then it can still 572 be valid if the filehandle passed the control handler. */ 573 if (vdev->ctrl_handler || ops->vidioc_queryctrl) 574 __set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); 575 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl) 576 __set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls); 577 if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) 578 __set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); 579 if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) 580 __set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); 581 if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) 582 __set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); 583 if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) 584 __set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); 585 if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) 586 __set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); 587 if (vdev->ctrl_handler || ops->vidioc_querymenu) 588 __set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); 589 if (!is_tch) { 590 SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); 591 SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); 592 } 593 SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); 594 #ifdef CONFIG_VIDEO_ADV_DEBUG 595 __set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls); 596 __set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls); 597 __set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls); 598 #endif 599 /* yes, really vidioc_subscribe_event */ 600 SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); 601 SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); 602 SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); 603 if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) 604 __set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); 605 606 if (is_vid) { 607 /* video specific ioctls */ 608 if ((is_rx && (ops->vidioc_enum_fmt_vid_cap || 609 ops->vidioc_enum_fmt_vid_overlay)) || 610 (is_tx && ops->vidioc_enum_fmt_vid_out)) 611 __set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 612 if ((is_rx && (ops->vidioc_g_fmt_vid_cap || 613 ops->vidioc_g_fmt_vid_cap_mplane || 614 ops->vidioc_g_fmt_vid_overlay)) || 615 (is_tx && (ops->vidioc_g_fmt_vid_out || 616 ops->vidioc_g_fmt_vid_out_mplane || 617 ops->vidioc_g_fmt_vid_out_overlay))) 618 __set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 619 if ((is_rx && (ops->vidioc_s_fmt_vid_cap || 620 ops->vidioc_s_fmt_vid_cap_mplane || 621 ops->vidioc_s_fmt_vid_overlay)) || 622 (is_tx && (ops->vidioc_s_fmt_vid_out || 623 ops->vidioc_s_fmt_vid_out_mplane || 624 ops->vidioc_s_fmt_vid_out_overlay))) 625 __set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 626 if ((is_rx && (ops->vidioc_try_fmt_vid_cap || 627 ops->vidioc_try_fmt_vid_cap_mplane || 628 ops->vidioc_try_fmt_vid_overlay)) || 629 (is_tx && (ops->vidioc_try_fmt_vid_out || 630 ops->vidioc_try_fmt_vid_out_mplane || 631 ops->vidioc_try_fmt_vid_out_overlay))) 632 __set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 633 SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); 634 SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); 635 SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); 636 SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); 637 SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); 638 SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); 639 SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); 640 SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); 641 SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); 642 SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); 643 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); 644 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); 645 if (ops->vidioc_g_selection) { 646 __set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); 647 __set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); 648 } 649 if (ops->vidioc_s_selection) 650 __set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); 651 SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); 652 SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); 653 } 654 if (is_meta && is_rx) { 655 /* metadata capture specific ioctls */ 656 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_meta_cap); 657 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_meta_cap); 658 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_meta_cap); 659 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_meta_cap); 660 } else if (is_meta && is_tx) { 661 /* metadata output specific ioctls */ 662 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_meta_out); 663 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_meta_out); 664 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_meta_out); 665 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_meta_out); 666 } 667 if (is_vbi) { 668 /* vbi specific ioctls */ 669 if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || 670 ops->vidioc_g_fmt_sliced_vbi_cap)) || 671 (is_tx && (ops->vidioc_g_fmt_vbi_out || 672 ops->vidioc_g_fmt_sliced_vbi_out))) 673 __set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 674 if ((is_rx && (ops->vidioc_s_fmt_vbi_cap || 675 ops->vidioc_s_fmt_sliced_vbi_cap)) || 676 (is_tx && (ops->vidioc_s_fmt_vbi_out || 677 ops->vidioc_s_fmt_sliced_vbi_out))) 678 __set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 679 if ((is_rx && (ops->vidioc_try_fmt_vbi_cap || 680 ops->vidioc_try_fmt_sliced_vbi_cap)) || 681 (is_tx && (ops->vidioc_try_fmt_vbi_out || 682 ops->vidioc_try_fmt_sliced_vbi_out))) 683 __set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 684 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); 685 } else if (is_tch) { 686 /* touch specific ioctls */ 687 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_vid_cap); 688 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_vid_cap); 689 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_vid_cap); 690 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_vid_cap); 691 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); 692 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); 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_G_PARM, vidioc_g_parm); 697 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); 698 } else if (is_sdr && is_rx) { 699 /* SDR receiver specific ioctls */ 700 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_sdr_cap); 701 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_sdr_cap); 702 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_sdr_cap); 703 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_sdr_cap); 704 } else if (is_sdr && is_tx) { 705 /* SDR transmitter specific ioctls */ 706 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_sdr_out); 707 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_sdr_out); 708 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_sdr_out); 709 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_sdr_out); 710 } 711 712 if (has_streaming) { 713 /* ioctls valid for streaming I/O */ 714 SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); 715 SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); 716 SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); 717 SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); 718 SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); 719 SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); 720 SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); 721 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); 722 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); 723 } 724 725 if (is_vid || is_vbi || is_meta) { 726 /* ioctls valid for video, vbi and metadata */ 727 if (ops->vidioc_s_std) 728 __set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); 729 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); 730 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); 731 if (is_rx) { 732 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); 733 if (is_io_mc) { 734 __set_bit(_IOC_NR(VIDIOC_ENUMINPUT), valid_ioctls); 735 __set_bit(_IOC_NR(VIDIOC_G_INPUT), valid_ioctls); 736 __set_bit(_IOC_NR(VIDIOC_S_INPUT), valid_ioctls); 737 } else { 738 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); 739 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); 740 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); 741 } 742 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); 743 SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); 744 SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); 745 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); 746 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); 747 } 748 if (is_tx) { 749 if (is_io_mc) { 750 __set_bit(_IOC_NR(VIDIOC_ENUMOUTPUT), valid_ioctls); 751 __set_bit(_IOC_NR(VIDIOC_G_OUTPUT), valid_ioctls); 752 __set_bit(_IOC_NR(VIDIOC_S_OUTPUT), valid_ioctls); 753 } else { 754 SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); 755 SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); 756 SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); 757 } 758 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); 759 SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); 760 SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); 761 } 762 if (ops->vidioc_g_parm || ops->vidioc_g_std) 763 __set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); 764 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); 765 SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); 766 SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); 767 SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); 768 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); 769 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid); 770 } 771 if (is_tx && (is_radio || is_sdr)) { 772 /* radio transmitter only ioctls */ 773 SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); 774 SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); 775 } 776 if (is_rx && !is_tch) { 777 /* receiver only ioctls */ 778 SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); 779 SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); 780 SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); 781 } 782 783 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, 784 BASE_VIDIOC_PRIVATE); 785 } 786 787 static int video_register_media_controller(struct video_device *vdev) 788 { 789 #if defined(CONFIG_MEDIA_CONTROLLER) 790 u32 intf_type; 791 int ret; 792 793 /* Memory-to-memory devices are more complex and use 794 * their own function to register its mc entities. 795 */ 796 if (!vdev->v4l2_dev->mdev || vdev->vfl_dir == VFL_DIR_M2M) 797 return 0; 798 799 vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE; 800 vdev->entity.function = MEDIA_ENT_F_UNKNOWN; 801 802 switch (vdev->vfl_type) { 803 case VFL_TYPE_VIDEO: 804 intf_type = MEDIA_INTF_T_V4L_VIDEO; 805 vdev->entity.function = MEDIA_ENT_F_IO_V4L; 806 break; 807 case VFL_TYPE_VBI: 808 intf_type = MEDIA_INTF_T_V4L_VBI; 809 vdev->entity.function = MEDIA_ENT_F_IO_VBI; 810 break; 811 case VFL_TYPE_SDR: 812 intf_type = MEDIA_INTF_T_V4L_SWRADIO; 813 vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO; 814 break; 815 case VFL_TYPE_TOUCH: 816 intf_type = MEDIA_INTF_T_V4L_TOUCH; 817 vdev->entity.function = MEDIA_ENT_F_IO_V4L; 818 break; 819 case VFL_TYPE_RADIO: 820 intf_type = MEDIA_INTF_T_V4L_RADIO; 821 /* 822 * Radio doesn't have an entity at the V4L2 side to represent 823 * radio input or output. Instead, the audio input/output goes 824 * via either physical wires or ALSA. 825 */ 826 break; 827 case VFL_TYPE_SUBDEV: 828 intf_type = MEDIA_INTF_T_V4L_SUBDEV; 829 /* Entity will be created via v4l2_device_register_subdev() */ 830 break; 831 default: 832 return 0; 833 } 834 835 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { 836 vdev->entity.name = vdev->name; 837 838 /* Needed just for backward compatibility with legacy MC API */ 839 vdev->entity.info.dev.major = VIDEO_MAJOR; 840 vdev->entity.info.dev.minor = vdev->minor; 841 842 ret = media_device_register_entity(vdev->v4l2_dev->mdev, 843 &vdev->entity); 844 if (ret < 0) { 845 pr_warn("%s: media_device_register_entity failed\n", 846 __func__); 847 return ret; 848 } 849 } 850 851 vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev, 852 intf_type, 853 0, VIDEO_MAJOR, 854 vdev->minor); 855 if (!vdev->intf_devnode) { 856 media_device_unregister_entity(&vdev->entity); 857 return -ENOMEM; 858 } 859 860 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { 861 struct media_link *link; 862 863 link = media_create_intf_link(&vdev->entity, 864 &vdev->intf_devnode->intf, 865 MEDIA_LNK_FL_ENABLED | 866 MEDIA_LNK_FL_IMMUTABLE); 867 if (!link) { 868 media_devnode_remove(vdev->intf_devnode); 869 media_device_unregister_entity(&vdev->entity); 870 return -ENOMEM; 871 } 872 } 873 874 /* FIXME: how to create the other interface links? */ 875 876 #endif 877 return 0; 878 } 879 880 int __video_register_device(struct video_device *vdev, 881 enum vfl_devnode_type type, 882 int nr, int warn_if_nr_in_use, 883 struct module *owner) 884 { 885 int i = 0; 886 int ret; 887 int minor_offset = 0; 888 int minor_cnt = VIDEO_NUM_DEVICES; 889 const char *name_base; 890 891 /* A minor value of -1 marks this video device as never 892 having been registered */ 893 vdev->minor = -1; 894 895 /* the release callback MUST be present */ 896 if (WARN_ON(!vdev->release)) 897 return -EINVAL; 898 /* the v4l2_dev pointer MUST be present */ 899 if (WARN_ON(!vdev->v4l2_dev)) 900 return -EINVAL; 901 /* the device_caps field MUST be set for all but subdevs */ 902 if (WARN_ON(type != VFL_TYPE_SUBDEV && !vdev->device_caps)) 903 return -EINVAL; 904 905 /* v4l2_fh support */ 906 spin_lock_init(&vdev->fh_lock); 907 INIT_LIST_HEAD(&vdev->fh_list); 908 909 /* Part 1: check device type */ 910 switch (type) { 911 case VFL_TYPE_VIDEO: 912 name_base = "video"; 913 break; 914 case VFL_TYPE_VBI: 915 name_base = "vbi"; 916 break; 917 case VFL_TYPE_RADIO: 918 name_base = "radio"; 919 break; 920 case VFL_TYPE_SUBDEV: 921 name_base = "v4l-subdev"; 922 break; 923 case VFL_TYPE_SDR: 924 /* Use device name 'swradio' because 'sdr' was already taken. */ 925 name_base = "swradio"; 926 break; 927 case VFL_TYPE_TOUCH: 928 name_base = "v4l-touch"; 929 break; 930 default: 931 pr_err("%s called with unknown type: %d\n", 932 __func__, type); 933 return -EINVAL; 934 } 935 936 vdev->vfl_type = type; 937 vdev->cdev = NULL; 938 if (vdev->dev_parent == NULL) 939 vdev->dev_parent = vdev->v4l2_dev->dev; 940 if (vdev->ctrl_handler == NULL) 941 vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; 942 /* If the prio state pointer is NULL, then use the v4l2_device 943 prio state. */ 944 if (vdev->prio == NULL) 945 vdev->prio = &vdev->v4l2_dev->prio; 946 947 /* Part 2: find a free minor, device node number and device index. */ 948 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 949 /* Keep the ranges for the first four types for historical 950 * reasons. 951 * Newer devices (not yet in place) should use the range 952 * of 128-191 and just pick the first free minor there 953 * (new style). */ 954 switch (type) { 955 case VFL_TYPE_VIDEO: 956 minor_offset = 0; 957 minor_cnt = 64; 958 break; 959 case VFL_TYPE_RADIO: 960 minor_offset = 64; 961 minor_cnt = 64; 962 break; 963 case VFL_TYPE_VBI: 964 minor_offset = 224; 965 minor_cnt = 32; 966 break; 967 default: 968 minor_offset = 128; 969 minor_cnt = 64; 970 break; 971 } 972 #endif 973 974 /* Pick a device node number */ 975 mutex_lock(&videodev_lock); 976 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); 977 if (nr == minor_cnt) 978 nr = devnode_find(vdev, 0, minor_cnt); 979 if (nr == minor_cnt) { 980 pr_err("could not get a free device node number\n"); 981 mutex_unlock(&videodev_lock); 982 return -ENFILE; 983 } 984 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 985 /* 1-on-1 mapping of device node number to minor number */ 986 i = nr; 987 #else 988 /* The device node number and minor numbers are independent, so 989 we just find the first free minor number. */ 990 for (i = 0; i < VIDEO_NUM_DEVICES; i++) 991 if (video_devices[i] == NULL) 992 break; 993 if (i == VIDEO_NUM_DEVICES) { 994 mutex_unlock(&videodev_lock); 995 pr_err("could not get a free minor\n"); 996 return -ENFILE; 997 } 998 #endif 999 vdev->minor = i + minor_offset; 1000 vdev->num = nr; 1001 1002 /* Should not happen since we thought this minor was free */ 1003 if (WARN_ON(video_devices[vdev->minor])) { 1004 mutex_unlock(&videodev_lock); 1005 pr_err("video_device not empty!\n"); 1006 return -ENFILE; 1007 } 1008 devnode_set(vdev); 1009 vdev->index = get_index(vdev); 1010 video_devices[vdev->minor] = vdev; 1011 mutex_unlock(&videodev_lock); 1012 1013 if (vdev->ioctl_ops) 1014 determine_valid_ioctls(vdev); 1015 1016 /* Part 3: Initialize the character device */ 1017 vdev->cdev = cdev_alloc(); 1018 if (vdev->cdev == NULL) { 1019 ret = -ENOMEM; 1020 goto cleanup; 1021 } 1022 vdev->cdev->ops = &v4l2_fops; 1023 vdev->cdev->owner = owner; 1024 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); 1025 if (ret < 0) { 1026 pr_err("%s: cdev_add failed\n", __func__); 1027 kfree(vdev->cdev); 1028 vdev->cdev = NULL; 1029 goto cleanup; 1030 } 1031 1032 /* Part 4: register the device with sysfs */ 1033 vdev->dev.class = &video_class; 1034 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); 1035 vdev->dev.parent = vdev->dev_parent; 1036 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); 1037 ret = device_register(&vdev->dev); 1038 if (ret < 0) { 1039 pr_err("%s: device_register failed\n", __func__); 1040 goto cleanup; 1041 } 1042 /* Register the release callback that will be called when the last 1043 reference to the device goes away. */ 1044 vdev->dev.release = v4l2_device_release; 1045 1046 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) 1047 pr_warn("%s: requested %s%d, got %s\n", __func__, 1048 name_base, nr, video_device_node_name(vdev)); 1049 1050 /* Increase v4l2_device refcount */ 1051 v4l2_device_get(vdev->v4l2_dev); 1052 1053 /* Part 5: Register the entity. */ 1054 ret = video_register_media_controller(vdev); 1055 1056 /* Part 6: Activate this minor. The char device can now be used. */ 1057 set_bit(V4L2_FL_REGISTERED, &vdev->flags); 1058 1059 return 0; 1060 1061 cleanup: 1062 mutex_lock(&videodev_lock); 1063 if (vdev->cdev) 1064 cdev_del(vdev->cdev); 1065 video_devices[vdev->minor] = NULL; 1066 devnode_clear(vdev); 1067 mutex_unlock(&videodev_lock); 1068 /* Mark this video device as never having been registered. */ 1069 vdev->minor = -1; 1070 return ret; 1071 } 1072 EXPORT_SYMBOL(__video_register_device); 1073 1074 /** 1075 * video_unregister_device - unregister a video4linux device 1076 * @vdev: the device to unregister 1077 * 1078 * This unregisters the passed device. Future open calls will 1079 * be met with errors. 1080 */ 1081 void video_unregister_device(struct video_device *vdev) 1082 { 1083 /* Check if vdev was ever registered at all */ 1084 if (!vdev || !video_is_registered(vdev)) 1085 return; 1086 1087 mutex_lock(&videodev_lock); 1088 /* This must be in a critical section to prevent a race with v4l2_open. 1089 * Once this bit has been cleared video_get may never be called again. 1090 */ 1091 clear_bit(V4L2_FL_REGISTERED, &vdev->flags); 1092 mutex_unlock(&videodev_lock); 1093 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags)) 1094 v4l2_event_wake_all(vdev); 1095 device_unregister(&vdev->dev); 1096 } 1097 EXPORT_SYMBOL(video_unregister_device); 1098 1099 #if defined(CONFIG_MEDIA_CONTROLLER) 1100 1101 __must_check int video_device_pipeline_start(struct video_device *vdev, 1102 struct media_pipeline *pipe) 1103 { 1104 struct media_entity *entity = &vdev->entity; 1105 1106 if (entity->num_pads != 1) 1107 return -ENODEV; 1108 1109 return media_pipeline_start(&entity->pads[0], pipe); 1110 } 1111 EXPORT_SYMBOL_GPL(video_device_pipeline_start); 1112 1113 __must_check int __video_device_pipeline_start(struct video_device *vdev, 1114 struct media_pipeline *pipe) 1115 { 1116 struct media_entity *entity = &vdev->entity; 1117 1118 if (entity->num_pads != 1) 1119 return -ENODEV; 1120 1121 return __media_pipeline_start(&entity->pads[0], pipe); 1122 } 1123 EXPORT_SYMBOL_GPL(__video_device_pipeline_start); 1124 1125 void video_device_pipeline_stop(struct video_device *vdev) 1126 { 1127 struct media_entity *entity = &vdev->entity; 1128 1129 if (WARN_ON(entity->num_pads != 1)) 1130 return; 1131 1132 return media_pipeline_stop(&entity->pads[0]); 1133 } 1134 EXPORT_SYMBOL_GPL(video_device_pipeline_stop); 1135 1136 void __video_device_pipeline_stop(struct video_device *vdev) 1137 { 1138 struct media_entity *entity = &vdev->entity; 1139 1140 if (WARN_ON(entity->num_pads != 1)) 1141 return; 1142 1143 return __media_pipeline_stop(&entity->pads[0]); 1144 } 1145 EXPORT_SYMBOL_GPL(__video_device_pipeline_stop); 1146 1147 __must_check int video_device_pipeline_alloc_start(struct video_device *vdev) 1148 { 1149 struct media_entity *entity = &vdev->entity; 1150 1151 if (entity->num_pads != 1) 1152 return -ENODEV; 1153 1154 return media_pipeline_alloc_start(&entity->pads[0]); 1155 } 1156 EXPORT_SYMBOL_GPL(video_device_pipeline_alloc_start); 1157 1158 struct media_pipeline *video_device_pipeline(struct video_device *vdev) 1159 { 1160 struct media_entity *entity = &vdev->entity; 1161 1162 if (WARN_ON(entity->num_pads != 1)) 1163 return NULL; 1164 1165 return media_pad_pipeline(&entity->pads[0]); 1166 } 1167 EXPORT_SYMBOL_GPL(video_device_pipeline); 1168 1169 #endif /* CONFIG_MEDIA_CONTROLLER */ 1170 1171 /* 1172 * Initialise video for linux 1173 */ 1174 static int __init videodev_init(void) 1175 { 1176 dev_t dev = MKDEV(VIDEO_MAJOR, 0); 1177 int ret; 1178 1179 pr_info("Linux video capture interface: v2.00\n"); 1180 ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); 1181 if (ret < 0) { 1182 pr_warn("videodev: unable to get major %d\n", 1183 VIDEO_MAJOR); 1184 return ret; 1185 } 1186 1187 ret = class_register(&video_class); 1188 if (ret < 0) { 1189 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); 1190 pr_warn("video_dev: class_register failed\n"); 1191 return -EIO; 1192 } 1193 1194 return 0; 1195 } 1196 1197 static void __exit videodev_exit(void) 1198 { 1199 dev_t dev = MKDEV(VIDEO_MAJOR, 0); 1200 1201 class_unregister(&video_class); 1202 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); 1203 } 1204 1205 subsys_initcall(videodev_init); 1206 module_exit(videodev_exit) 1207 1208 MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@kernel.org>, Bill Dirks, Justin Schoeman, Gerd Knorr"); 1209 MODULE_DESCRIPTION("Video4Linux2 core driver"); 1210 MODULE_LICENSE("GPL"); 1211 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); 1212