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 && vdev->vfl_dir != VFL_DIR_M2M) { 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 /* 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 if (ops->op) \ 523 set_bit(_IOC_NR(cmd), valid_ioctls) 524 525 /* This determines which ioctls are actually implemented in the driver. 526 It's a one-time thing which simplifies video_ioctl2 as it can just do 527 a bit test. 528 529 Note that drivers can override this by setting bits to 1 in 530 vdev->valid_ioctls. If an ioctl is marked as 1 when this function is 531 called, then that ioctl will actually be marked as unimplemented. 532 533 It does that by first setting up the local valid_ioctls bitmap, and 534 at the end do a: 535 536 vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) 537 */ 538 static void determine_valid_ioctls(struct video_device *vdev) 539 { 540 DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); 541 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; 542 bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER; 543 bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; 544 bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; 545 bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR; 546 bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH; 547 bool is_rx = vdev->vfl_dir != VFL_DIR_TX; 548 bool is_tx = vdev->vfl_dir != VFL_DIR_RX; 549 550 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); 551 552 /* vfl_type and vfl_dir independent ioctls */ 553 554 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); 555 set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); 556 set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); 557 558 /* Note: the control handler can also be passed through the filehandle, 559 and that can't be tested here. If the bit for these control ioctls 560 is set, then the ioctl is valid. But if it is 0, then it can still 561 be valid if the filehandle passed the control handler. */ 562 if (vdev->ctrl_handler || ops->vidioc_queryctrl) 563 set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); 564 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl) 565 set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls); 566 if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) 567 set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); 568 if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) 569 set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); 570 if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) 571 set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); 572 if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) 573 set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); 574 if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) 575 set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); 576 if (vdev->ctrl_handler || ops->vidioc_querymenu) 577 set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); 578 SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); 579 SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); 580 SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); 581 #ifdef CONFIG_VIDEO_ADV_DEBUG 582 set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls); 583 set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls); 584 set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls); 585 #endif 586 /* yes, really vidioc_subscribe_event */ 587 SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); 588 SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); 589 SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); 590 if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) 591 set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); 592 593 if (is_vid || is_tch) { 594 /* video and metadata specific ioctls */ 595 if ((is_rx && (ops->vidioc_enum_fmt_vid_cap || 596 ops->vidioc_enum_fmt_vid_cap_mplane || 597 ops->vidioc_enum_fmt_vid_overlay || 598 ops->vidioc_enum_fmt_meta_cap)) || 599 (is_tx && (ops->vidioc_enum_fmt_vid_out || 600 ops->vidioc_enum_fmt_vid_out_mplane))) 601 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 602 if ((is_rx && (ops->vidioc_g_fmt_vid_cap || 603 ops->vidioc_g_fmt_vid_cap_mplane || 604 ops->vidioc_g_fmt_vid_overlay || 605 ops->vidioc_g_fmt_meta_cap)) || 606 (is_tx && (ops->vidioc_g_fmt_vid_out || 607 ops->vidioc_g_fmt_vid_out_mplane || 608 ops->vidioc_g_fmt_vid_out_overlay))) 609 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 610 if ((is_rx && (ops->vidioc_s_fmt_vid_cap || 611 ops->vidioc_s_fmt_vid_cap_mplane || 612 ops->vidioc_s_fmt_vid_overlay || 613 ops->vidioc_s_fmt_meta_cap)) || 614 (is_tx && (ops->vidioc_s_fmt_vid_out || 615 ops->vidioc_s_fmt_vid_out_mplane || 616 ops->vidioc_s_fmt_vid_out_overlay))) 617 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 618 if ((is_rx && (ops->vidioc_try_fmt_vid_cap || 619 ops->vidioc_try_fmt_vid_cap_mplane || 620 ops->vidioc_try_fmt_vid_overlay || 621 ops->vidioc_try_fmt_meta_cap)) || 622 (is_tx && (ops->vidioc_try_fmt_vid_out || 623 ops->vidioc_try_fmt_vid_out_mplane || 624 ops->vidioc_try_fmt_vid_out_overlay))) 625 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 626 SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); 627 SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); 628 SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); 629 SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); 630 SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); 631 SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); 632 SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); 633 SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); 634 SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); 635 SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); 636 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); 637 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); 638 if (ops->vidioc_g_crop || ops->vidioc_g_selection) 639 set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); 640 if (ops->vidioc_s_crop || ops->vidioc_s_selection) 641 set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); 642 SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); 643 SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); 644 if (ops->vidioc_cropcap || ops->vidioc_g_selection) 645 set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); 646 } else if (is_vbi) { 647 /* vbi specific ioctls */ 648 if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || 649 ops->vidioc_g_fmt_sliced_vbi_cap)) || 650 (is_tx && (ops->vidioc_g_fmt_vbi_out || 651 ops->vidioc_g_fmt_sliced_vbi_out))) 652 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 653 if ((is_rx && (ops->vidioc_s_fmt_vbi_cap || 654 ops->vidioc_s_fmt_sliced_vbi_cap)) || 655 (is_tx && (ops->vidioc_s_fmt_vbi_out || 656 ops->vidioc_s_fmt_sliced_vbi_out))) 657 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 658 if ((is_rx && (ops->vidioc_try_fmt_vbi_cap || 659 ops->vidioc_try_fmt_sliced_vbi_cap)) || 660 (is_tx && (ops->vidioc_try_fmt_vbi_out || 661 ops->vidioc_try_fmt_sliced_vbi_out))) 662 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 663 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); 664 } else if (is_sdr && is_rx) { 665 /* SDR receiver specific ioctls */ 666 if (ops->vidioc_enum_fmt_sdr_cap) 667 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 668 if (ops->vidioc_g_fmt_sdr_cap) 669 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 670 if (ops->vidioc_s_fmt_sdr_cap) 671 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 672 if (ops->vidioc_try_fmt_sdr_cap) 673 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 674 } else if (is_sdr && is_tx) { 675 /* SDR transmitter specific ioctls */ 676 if (ops->vidioc_enum_fmt_sdr_out) 677 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); 678 if (ops->vidioc_g_fmt_sdr_out) 679 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); 680 if (ops->vidioc_s_fmt_sdr_out) 681 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); 682 if (ops->vidioc_try_fmt_sdr_out) 683 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); 684 } 685 686 if (is_vid || is_vbi || is_sdr || is_tch) { 687 /* ioctls valid for video, metadata, vbi or sdr */ 688 SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); 689 SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); 690 SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); 691 SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); 692 SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); 693 SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); 694 SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); 695 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); 696 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); 697 } 698 699 if (is_vid || is_vbi || is_tch) { 700 /* ioctls valid for video or vbi */ 701 if (ops->vidioc_s_std) 702 set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); 703 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); 704 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); 705 if (is_rx) { 706 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); 707 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); 708 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); 709 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); 710 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); 711 SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); 712 SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); 713 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); 714 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); 715 } 716 if (is_tx) { 717 SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); 718 SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); 719 SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); 720 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); 721 SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); 722 SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); 723 } 724 if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && 725 ops->vidioc_g_std)) 726 set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); 727 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); 728 SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); 729 SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); 730 SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); 731 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); 732 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid); 733 } 734 if (is_tx && (is_radio || is_sdr)) { 735 /* radio transmitter only ioctls */ 736 SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); 737 SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); 738 } 739 if (is_rx) { 740 /* receiver only ioctls */ 741 SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); 742 SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); 743 SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); 744 } 745 746 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, 747 BASE_VIDIOC_PRIVATE); 748 } 749 750 static int video_register_media_controller(struct video_device *vdev) 751 { 752 #if defined(CONFIG_MEDIA_CONTROLLER) 753 u32 intf_type; 754 int ret; 755 756 /* Memory-to-memory devices are more complex and use 757 * their own function to register its mc entities. 758 */ 759 if (!vdev->v4l2_dev->mdev || vdev->vfl_dir == VFL_DIR_M2M) 760 return 0; 761 762 vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE; 763 vdev->entity.function = MEDIA_ENT_F_UNKNOWN; 764 765 switch (vdev->vfl_type) { 766 case VFL_TYPE_GRABBER: 767 intf_type = MEDIA_INTF_T_V4L_VIDEO; 768 vdev->entity.function = MEDIA_ENT_F_IO_V4L; 769 break; 770 case VFL_TYPE_VBI: 771 intf_type = MEDIA_INTF_T_V4L_VBI; 772 vdev->entity.function = MEDIA_ENT_F_IO_VBI; 773 break; 774 case VFL_TYPE_SDR: 775 intf_type = MEDIA_INTF_T_V4L_SWRADIO; 776 vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO; 777 break; 778 case VFL_TYPE_TOUCH: 779 intf_type = MEDIA_INTF_T_V4L_TOUCH; 780 vdev->entity.function = MEDIA_ENT_F_IO_V4L; 781 break; 782 case VFL_TYPE_RADIO: 783 intf_type = MEDIA_INTF_T_V4L_RADIO; 784 /* 785 * Radio doesn't have an entity at the V4L2 side to represent 786 * radio input or output. Instead, the audio input/output goes 787 * via either physical wires or ALSA. 788 */ 789 break; 790 case VFL_TYPE_SUBDEV: 791 intf_type = MEDIA_INTF_T_V4L_SUBDEV; 792 /* Entity will be created via v4l2_device_register_subdev() */ 793 break; 794 default: 795 return 0; 796 } 797 798 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { 799 vdev->entity.name = vdev->name; 800 801 /* Needed just for backward compatibility with legacy MC API */ 802 vdev->entity.info.dev.major = VIDEO_MAJOR; 803 vdev->entity.info.dev.minor = vdev->minor; 804 805 ret = media_device_register_entity(vdev->v4l2_dev->mdev, 806 &vdev->entity); 807 if (ret < 0) { 808 pr_warn("%s: media_device_register_entity failed\n", 809 __func__); 810 return ret; 811 } 812 } 813 814 vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev, 815 intf_type, 816 0, VIDEO_MAJOR, 817 vdev->minor); 818 if (!vdev->intf_devnode) { 819 media_device_unregister_entity(&vdev->entity); 820 return -ENOMEM; 821 } 822 823 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { 824 struct media_link *link; 825 826 link = media_create_intf_link(&vdev->entity, 827 &vdev->intf_devnode->intf, 828 MEDIA_LNK_FL_ENABLED | 829 MEDIA_LNK_FL_IMMUTABLE); 830 if (!link) { 831 media_devnode_remove(vdev->intf_devnode); 832 media_device_unregister_entity(&vdev->entity); 833 return -ENOMEM; 834 } 835 } 836 837 /* FIXME: how to create the other interface links? */ 838 839 #endif 840 return 0; 841 } 842 843 int __video_register_device(struct video_device *vdev, 844 enum vfl_devnode_type type, 845 int nr, int warn_if_nr_in_use, 846 struct module *owner) 847 { 848 int i = 0; 849 int ret; 850 int minor_offset = 0; 851 int minor_cnt = VIDEO_NUM_DEVICES; 852 const char *name_base; 853 854 /* A minor value of -1 marks this video device as never 855 having been registered */ 856 vdev->minor = -1; 857 858 /* the release callback MUST be present */ 859 if (WARN_ON(!vdev->release)) 860 return -EINVAL; 861 /* the v4l2_dev pointer MUST be present */ 862 if (WARN_ON(!vdev->v4l2_dev)) 863 return -EINVAL; 864 865 /* v4l2_fh support */ 866 spin_lock_init(&vdev->fh_lock); 867 INIT_LIST_HEAD(&vdev->fh_list); 868 869 /* Part 1: check device type */ 870 switch (type) { 871 case VFL_TYPE_GRABBER: 872 name_base = "video"; 873 break; 874 case VFL_TYPE_VBI: 875 name_base = "vbi"; 876 break; 877 case VFL_TYPE_RADIO: 878 name_base = "radio"; 879 break; 880 case VFL_TYPE_SUBDEV: 881 name_base = "v4l-subdev"; 882 break; 883 case VFL_TYPE_SDR: 884 /* Use device name 'swradio' because 'sdr' was already taken. */ 885 name_base = "swradio"; 886 break; 887 case VFL_TYPE_TOUCH: 888 name_base = "v4l-touch"; 889 break; 890 default: 891 pr_err("%s called with unknown type: %d\n", 892 __func__, type); 893 return -EINVAL; 894 } 895 896 vdev->vfl_type = type; 897 vdev->cdev = NULL; 898 if (vdev->dev_parent == NULL) 899 vdev->dev_parent = vdev->v4l2_dev->dev; 900 if (vdev->ctrl_handler == NULL) 901 vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; 902 /* If the prio state pointer is NULL, then use the v4l2_device 903 prio state. */ 904 if (vdev->prio == NULL) 905 vdev->prio = &vdev->v4l2_dev->prio; 906 907 /* Part 2: find a free minor, device node number and device index. */ 908 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 909 /* Keep the ranges for the first four types for historical 910 * reasons. 911 * Newer devices (not yet in place) should use the range 912 * of 128-191 and just pick the first free minor there 913 * (new style). */ 914 switch (type) { 915 case VFL_TYPE_GRABBER: 916 minor_offset = 0; 917 minor_cnt = 64; 918 break; 919 case VFL_TYPE_RADIO: 920 minor_offset = 64; 921 minor_cnt = 64; 922 break; 923 case VFL_TYPE_VBI: 924 minor_offset = 224; 925 minor_cnt = 32; 926 break; 927 default: 928 minor_offset = 128; 929 minor_cnt = 64; 930 break; 931 } 932 #endif 933 934 /* Pick a device node number */ 935 mutex_lock(&videodev_lock); 936 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); 937 if (nr == minor_cnt) 938 nr = devnode_find(vdev, 0, minor_cnt); 939 if (nr == minor_cnt) { 940 pr_err("could not get a free device node number\n"); 941 mutex_unlock(&videodev_lock); 942 return -ENFILE; 943 } 944 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES 945 /* 1-on-1 mapping of device node number to minor number */ 946 i = nr; 947 #else 948 /* The device node number and minor numbers are independent, so 949 we just find the first free minor number. */ 950 for (i = 0; i < VIDEO_NUM_DEVICES; i++) 951 if (video_devices[i] == NULL) 952 break; 953 if (i == VIDEO_NUM_DEVICES) { 954 mutex_unlock(&videodev_lock); 955 pr_err("could not get a free minor\n"); 956 return -ENFILE; 957 } 958 #endif 959 vdev->minor = i + minor_offset; 960 vdev->num = nr; 961 962 /* Should not happen since we thought this minor was free */ 963 if (WARN_ON(video_devices[vdev->minor])) { 964 mutex_unlock(&videodev_lock); 965 pr_err("video_device not empty!\n"); 966 return -ENFILE; 967 } 968 devnode_set(vdev); 969 vdev->index = get_index(vdev); 970 video_devices[vdev->minor] = vdev; 971 mutex_unlock(&videodev_lock); 972 973 if (vdev->ioctl_ops) 974 determine_valid_ioctls(vdev); 975 976 /* Part 3: Initialize the character device */ 977 vdev->cdev = cdev_alloc(); 978 if (vdev->cdev == NULL) { 979 ret = -ENOMEM; 980 goto cleanup; 981 } 982 vdev->cdev->ops = &v4l2_fops; 983 vdev->cdev->owner = owner; 984 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); 985 if (ret < 0) { 986 pr_err("%s: cdev_add failed\n", __func__); 987 kfree(vdev->cdev); 988 vdev->cdev = NULL; 989 goto cleanup; 990 } 991 992 /* Part 4: register the device with sysfs */ 993 vdev->dev.class = &video_class; 994 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); 995 vdev->dev.parent = vdev->dev_parent; 996 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); 997 ret = device_register(&vdev->dev); 998 if (ret < 0) { 999 pr_err("%s: device_register failed\n", __func__); 1000 goto cleanup; 1001 } 1002 /* Register the release callback that will be called when the last 1003 reference to the device goes away. */ 1004 vdev->dev.release = v4l2_device_release; 1005 1006 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) 1007 pr_warn("%s: requested %s%d, got %s\n", __func__, 1008 name_base, nr, video_device_node_name(vdev)); 1009 1010 /* Increase v4l2_device refcount */ 1011 v4l2_device_get(vdev->v4l2_dev); 1012 1013 /* Part 5: Register the entity. */ 1014 ret = video_register_media_controller(vdev); 1015 1016 /* Part 6: Activate this minor. The char device can now be used. */ 1017 set_bit(V4L2_FL_REGISTERED, &vdev->flags); 1018 1019 return 0; 1020 1021 cleanup: 1022 mutex_lock(&videodev_lock); 1023 if (vdev->cdev) 1024 cdev_del(vdev->cdev); 1025 video_devices[vdev->minor] = NULL; 1026 devnode_clear(vdev); 1027 mutex_unlock(&videodev_lock); 1028 /* Mark this video device as never having been registered. */ 1029 vdev->minor = -1; 1030 return ret; 1031 } 1032 EXPORT_SYMBOL(__video_register_device); 1033 1034 /** 1035 * video_unregister_device - unregister a video4linux device 1036 * @vdev: the device to unregister 1037 * 1038 * This unregisters the passed device. Future open calls will 1039 * be met with errors. 1040 */ 1041 void video_unregister_device(struct video_device *vdev) 1042 { 1043 /* Check if vdev was ever registered at all */ 1044 if (!vdev || !video_is_registered(vdev)) 1045 return; 1046 1047 mutex_lock(&videodev_lock); 1048 /* This must be in a critical section to prevent a race with v4l2_open. 1049 * Once this bit has been cleared video_get may never be called again. 1050 */ 1051 clear_bit(V4L2_FL_REGISTERED, &vdev->flags); 1052 mutex_unlock(&videodev_lock); 1053 device_unregister(&vdev->dev); 1054 } 1055 EXPORT_SYMBOL(video_unregister_device); 1056 1057 /* 1058 * Initialise video for linux 1059 */ 1060 static int __init videodev_init(void) 1061 { 1062 dev_t dev = MKDEV(VIDEO_MAJOR, 0); 1063 int ret; 1064 1065 pr_info("Linux video capture interface: v2.00\n"); 1066 ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); 1067 if (ret < 0) { 1068 pr_warn("videodev: unable to get major %d\n", 1069 VIDEO_MAJOR); 1070 return ret; 1071 } 1072 1073 ret = class_register(&video_class); 1074 if (ret < 0) { 1075 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); 1076 pr_warn("video_dev: class_register failed\n"); 1077 return -EIO; 1078 } 1079 1080 return 0; 1081 } 1082 1083 static void __exit videodev_exit(void) 1084 { 1085 dev_t dev = MKDEV(VIDEO_MAJOR, 0); 1086 1087 class_unregister(&video_class); 1088 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); 1089 } 1090 1091 subsys_initcall(videodev_init); 1092 module_exit(videodev_exit) 1093 1094 MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@kernel.org>"); 1095 MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); 1096 MODULE_LICENSE("GPL"); 1097 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); 1098