Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 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 | * |
Alan Cox | d9b0144 | 2008-10-27 15:13:47 -0300 | [diff] [blame] | 12 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1) |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 13 | * Mauro Carvalho Chehab <mchehab@infradead.org> (version 2) |
| 14 | * |
| 15 | * Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com> |
| 16 | * - Added procfs support |
| 17 | */ |
| 18 | |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/kmod.h> |
| 27 | #include <linux/slab.h> |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/system.h> |
| 30 | |
| 31 | #include <media/v4l2-common.h> |
Hans Verkuil | 9bea351 | 2008-12-23 07:35:17 -0300 | [diff] [blame] | 32 | #include <media/v4l2-device.h> |
Hans Verkuil | bec4366 | 2008-12-30 06:58:20 -0300 | [diff] [blame] | 33 | #include <media/v4l2-ioctl.h> |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 34 | |
| 35 | #define VIDEO_NUM_DEVICES 256 |
| 36 | #define VIDEO_NAME "video4linux" |
| 37 | |
| 38 | /* |
| 39 | * sysfs stuff |
| 40 | */ |
| 41 | |
| 42 | static ssize_t show_index(struct device *cd, |
| 43 | struct device_attribute *attr, char *buf) |
| 44 | { |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 45 | struct video_device *vdev = to_video_device(cd); |
Hans Verkuil | bfa8a27 | 2008-08-23 07:48:38 -0300 | [diff] [blame] | 46 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 47 | return sprintf(buf, "%i\n", vdev->index); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | static ssize_t show_name(struct device *cd, |
| 51 | struct device_attribute *attr, char *buf) |
| 52 | { |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 53 | struct video_device *vdev = to_video_device(cd); |
Hans Verkuil | bfa8a27 | 2008-08-23 07:48:38 -0300 | [diff] [blame] | 54 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 55 | return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | static struct device_attribute video_device_attrs[] = { |
| 59 | __ATTR(name, S_IRUGO, show_name, NULL), |
| 60 | __ATTR(index, S_IRUGO, show_index, NULL), |
| 61 | __ATTR_NULL |
| 62 | }; |
| 63 | |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 64 | /* |
| 65 | * Active devices |
| 66 | */ |
| 67 | static struct video_device *video_device[VIDEO_NUM_DEVICES]; |
| 68 | static DEFINE_MUTEX(videodev_lock); |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 69 | static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 70 | |
Hans Verkuil | 5062cb7 | 2009-09-07 03:40:24 -0300 | [diff] [blame] | 71 | /* Device node utility functions */ |
| 72 | |
| 73 | /* Note: these utility functions all assume that vfl_type is in the range |
| 74 | [0, VFL_TYPE_MAX-1]. */ |
| 75 | |
| 76 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
| 77 | /* Return the bitmap corresponding to vfl_type. */ |
| 78 | static inline unsigned long *devnode_bits(int vfl_type) |
| 79 | { |
| 80 | /* Any types not assigned to fixed minor ranges must be mapped to |
| 81 | one single bitmap for the purposes of finding a free node number |
| 82 | since all those unassigned types use the same minor range. */ |
| 83 | int idx = (vfl_type > VFL_TYPE_VTX) ? VFL_TYPE_MAX - 1 : vfl_type; |
| 84 | |
| 85 | return devnode_nums[idx]; |
| 86 | } |
| 87 | #else |
| 88 | /* Return the bitmap corresponding to vfl_type. */ |
| 89 | static inline unsigned long *devnode_bits(int vfl_type) |
| 90 | { |
| 91 | return devnode_nums[vfl_type]; |
| 92 | } |
| 93 | #endif |
| 94 | |
| 95 | /* Mark device node number vdev->num as used */ |
| 96 | static inline void devnode_set(struct video_device *vdev) |
| 97 | { |
| 98 | set_bit(vdev->num, devnode_bits(vdev->vfl_type)); |
| 99 | } |
| 100 | |
| 101 | /* Mark device node number vdev->num as unused */ |
| 102 | static inline void devnode_clear(struct video_device *vdev) |
| 103 | { |
| 104 | clear_bit(vdev->num, devnode_bits(vdev->vfl_type)); |
| 105 | } |
| 106 | |
| 107 | /* Try to find a free device node number in the range [from, to> */ |
| 108 | static inline int devnode_find(struct video_device *vdev, int from, int to) |
| 109 | { |
| 110 | return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from); |
| 111 | } |
| 112 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 113 | struct video_device *video_device_alloc(void) |
| 114 | { |
Hans Verkuil | bfa8a27 | 2008-08-23 07:48:38 -0300 | [diff] [blame] | 115 | return kzalloc(sizeof(struct video_device), GFP_KERNEL); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 116 | } |
| 117 | EXPORT_SYMBOL(video_device_alloc); |
| 118 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 119 | void video_device_release(struct video_device *vdev) |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 120 | { |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 121 | kfree(vdev); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 122 | } |
| 123 | EXPORT_SYMBOL(video_device_release); |
| 124 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 125 | void video_device_release_empty(struct video_device *vdev) |
Hans Verkuil | f9e86b5 | 2008-08-23 05:47:41 -0300 | [diff] [blame] | 126 | { |
| 127 | /* Do nothing */ |
| 128 | /* Only valid when the video_device struct is a static. */ |
| 129 | } |
| 130 | EXPORT_SYMBOL(video_device_release_empty); |
| 131 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 132 | static inline void video_get(struct video_device *vdev) |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 133 | { |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 134 | get_device(&vdev->dev); |
| 135 | } |
| 136 | |
| 137 | static inline void video_put(struct video_device *vdev) |
| 138 | { |
| 139 | put_device(&vdev->dev); |
| 140 | } |
| 141 | |
| 142 | /* Called when the last user of the video device exits. */ |
| 143 | static void v4l2_device_release(struct device *cd) |
| 144 | { |
| 145 | struct video_device *vdev = to_video_device(cd); |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 146 | |
| 147 | mutex_lock(&videodev_lock); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 148 | if (video_device[vdev->minor] != vdev) { |
Hans Verkuil | 6ea9a18 | 2008-08-30 09:40:47 -0300 | [diff] [blame] | 149 | mutex_unlock(&videodev_lock); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 150 | /* should not happen */ |
| 151 | WARN_ON(1); |
Hans Verkuil | 6ea9a18 | 2008-08-30 09:40:47 -0300 | [diff] [blame] | 152 | return; |
| 153 | } |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 154 | |
| 155 | /* Free up this device for reuse */ |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 156 | video_device[vdev->minor] = NULL; |
| 157 | |
| 158 | /* Delete the cdev on this minor as well */ |
| 159 | cdev_del(vdev->cdev); |
| 160 | /* Just in case some driver tries to access this from |
| 161 | the release() callback. */ |
| 162 | vdev->cdev = NULL; |
| 163 | |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 164 | /* Mark device node number as free */ |
Hans Verkuil | 5062cb7 | 2009-09-07 03:40:24 -0300 | [diff] [blame] | 165 | devnode_clear(vdev); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 166 | |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 167 | mutex_unlock(&videodev_lock); |
| 168 | |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 169 | /* Release video_device and perform other |
| 170 | cleanups as needed. */ |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 171 | vdev->release(vdev); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | static struct class video_class = { |
| 175 | .name = VIDEO_NAME, |
| 176 | .dev_attrs = video_device_attrs, |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 177 | }; |
| 178 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 179 | struct video_device *video_devdata(struct file *file) |
| 180 | { |
| 181 | return video_device[iminor(file->f_path.dentry->d_inode)]; |
| 182 | } |
| 183 | EXPORT_SYMBOL(video_devdata); |
| 184 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 185 | static ssize_t v4l2_read(struct file *filp, char __user *buf, |
| 186 | size_t sz, loff_t *off) |
| 187 | { |
| 188 | struct video_device *vdev = video_devdata(filp); |
| 189 | |
| 190 | if (!vdev->fops->read) |
| 191 | return -EINVAL; |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 192 | if (!video_is_registered(vdev)) |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 193 | return -EIO; |
| 194 | return vdev->fops->read(filp, buf, sz, off); |
| 195 | } |
| 196 | |
| 197 | static ssize_t v4l2_write(struct file *filp, const char __user *buf, |
| 198 | size_t sz, loff_t *off) |
| 199 | { |
| 200 | struct video_device *vdev = video_devdata(filp); |
| 201 | |
| 202 | if (!vdev->fops->write) |
| 203 | return -EINVAL; |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 204 | if (!video_is_registered(vdev)) |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 205 | return -EIO; |
| 206 | return vdev->fops->write(filp, buf, sz, off); |
| 207 | } |
| 208 | |
| 209 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) |
| 210 | { |
| 211 | struct video_device *vdev = video_devdata(filp); |
| 212 | |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 213 | if (!vdev->fops->poll || !video_is_registered(vdev)) |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 214 | return DEFAULT_POLLMASK; |
| 215 | return vdev->fops->poll(filp, poll); |
| 216 | } |
| 217 | |
| 218 | static int v4l2_ioctl(struct inode *inode, struct file *filp, |
| 219 | unsigned int cmd, unsigned long arg) |
| 220 | { |
| 221 | struct video_device *vdev = video_devdata(filp); |
| 222 | |
| 223 | if (!vdev->fops->ioctl) |
| 224 | return -ENOTTY; |
| 225 | /* Allow ioctl to continue even if the device was unregistered. |
| 226 | Things like dequeueing buffers might still be useful. */ |
Hans Verkuil | bec4366 | 2008-12-30 06:58:20 -0300 | [diff] [blame] | 227 | return vdev->fops->ioctl(filp, cmd, arg); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 228 | } |
| 229 | |
| 230 | static long v4l2_unlocked_ioctl(struct file *filp, |
| 231 | unsigned int cmd, unsigned long arg) |
| 232 | { |
| 233 | struct video_device *vdev = video_devdata(filp); |
| 234 | |
| 235 | if (!vdev->fops->unlocked_ioctl) |
| 236 | return -ENOTTY; |
| 237 | /* Allow ioctl to continue even if the device was unregistered. |
| 238 | Things like dequeueing buffers might still be useful. */ |
| 239 | return vdev->fops->unlocked_ioctl(filp, cmd, arg); |
| 240 | } |
| 241 | |
Daniel Glöckner | c01f1a5 | 2009-03-26 11:31:08 -0300 | [diff] [blame] | 242 | #ifdef CONFIG_MMU |
| 243 | #define v4l2_get_unmapped_area NULL |
| 244 | #else |
| 245 | static unsigned long v4l2_get_unmapped_area(struct file *filp, |
| 246 | unsigned long addr, unsigned long len, unsigned long pgoff, |
| 247 | unsigned long flags) |
| 248 | { |
| 249 | struct video_device *vdev = video_devdata(filp); |
| 250 | |
| 251 | if (!vdev->fops->get_unmapped_area) |
| 252 | return -ENOSYS; |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 253 | if (!video_is_registered(vdev)) |
Daniel Glöckner | c01f1a5 | 2009-03-26 11:31:08 -0300 | [diff] [blame] | 254 | return -ENODEV; |
| 255 | return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); |
| 256 | } |
| 257 | #endif |
| 258 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 259 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
| 260 | { |
| 261 | struct video_device *vdev = video_devdata(filp); |
| 262 | |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 263 | if (!vdev->fops->mmap || !video_is_registered(vdev)) |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 264 | return -ENODEV; |
| 265 | return vdev->fops->mmap(filp, vm); |
| 266 | } |
| 267 | |
| 268 | /* Override for the open function */ |
| 269 | static int v4l2_open(struct inode *inode, struct file *filp) |
| 270 | { |
| 271 | struct video_device *vdev; |
Hans Verkuil | 65d9ff9 | 2009-03-29 20:19:38 -0300 | [diff] [blame] | 272 | int ret = 0; |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 273 | |
| 274 | /* Check if the video device is available */ |
| 275 | mutex_lock(&videodev_lock); |
| 276 | vdev = video_devdata(filp); |
| 277 | /* return ENODEV if the video device has been removed |
| 278 | already or if it is not registered anymore. */ |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 279 | if (vdev == NULL || !video_is_registered(vdev)) { |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 280 | mutex_unlock(&videodev_lock); |
| 281 | return -ENODEV; |
| 282 | } |
| 283 | /* and increase the device refcount */ |
| 284 | video_get(vdev); |
| 285 | mutex_unlock(&videodev_lock); |
Hans Verkuil | 65d9ff9 | 2009-03-29 20:19:38 -0300 | [diff] [blame] | 286 | if (vdev->fops->open) |
| 287 | ret = vdev->fops->open(filp); |
| 288 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 289 | /* decrease the refcount in case of an error */ |
| 290 | if (ret) |
| 291 | video_put(vdev); |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | /* Override for the release function */ |
| 296 | static int v4l2_release(struct inode *inode, struct file *filp) |
| 297 | { |
| 298 | struct video_device *vdev = video_devdata(filp); |
Hans Verkuil | 65d9ff9 | 2009-03-29 20:19:38 -0300 | [diff] [blame] | 299 | int ret = 0; |
| 300 | |
| 301 | if (vdev->fops->release) |
| 302 | vdev->fops->release(filp); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 303 | |
| 304 | /* decrease the refcount unconditionally since the release() |
| 305 | return value is ignored. */ |
| 306 | video_put(vdev); |
| 307 | return ret; |
| 308 | } |
| 309 | |
| 310 | static const struct file_operations v4l2_unlocked_fops = { |
| 311 | .owner = THIS_MODULE, |
| 312 | .read = v4l2_read, |
| 313 | .write = v4l2_write, |
| 314 | .open = v4l2_open, |
Daniel Glöckner | c01f1a5 | 2009-03-26 11:31:08 -0300 | [diff] [blame] | 315 | .get_unmapped_area = v4l2_get_unmapped_area, |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 316 | .mmap = v4l2_mmap, |
| 317 | .unlocked_ioctl = v4l2_unlocked_ioctl, |
| 318 | #ifdef CONFIG_COMPAT |
Hans Verkuil | 9bb7cde | 2008-12-30 06:42:40 -0300 | [diff] [blame] | 319 | .compat_ioctl = v4l2_compat_ioctl32, |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 320 | #endif |
| 321 | .release = v4l2_release, |
| 322 | .poll = v4l2_poll, |
| 323 | .llseek = no_llseek, |
| 324 | }; |
| 325 | |
| 326 | static const struct file_operations v4l2_fops = { |
| 327 | .owner = THIS_MODULE, |
| 328 | .read = v4l2_read, |
| 329 | .write = v4l2_write, |
| 330 | .open = v4l2_open, |
Daniel Glöckner | c01f1a5 | 2009-03-26 11:31:08 -0300 | [diff] [blame] | 331 | .get_unmapped_area = v4l2_get_unmapped_area, |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 332 | .mmap = v4l2_mmap, |
| 333 | .ioctl = v4l2_ioctl, |
| 334 | #ifdef CONFIG_COMPAT |
Hans Verkuil | 9bb7cde | 2008-12-30 06:42:40 -0300 | [diff] [blame] | 335 | .compat_ioctl = v4l2_compat_ioctl32, |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 336 | #endif |
| 337 | .release = v4l2_release, |
| 338 | .poll = v4l2_poll, |
| 339 | .llseek = no_llseek, |
| 340 | }; |
| 341 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 342 | /** |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 343 | * get_index - assign stream index number based on parent device |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 344 | * @vdev: video_device to assign index number to, vdev->parent should be assigned |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 345 | * |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 346 | * Note that when this is called the new device has not yet been registered |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 347 | * in the video_device array, but it was able to obtain a minor number. |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 348 | * |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 349 | * This means that we can always obtain a free stream index number since |
| 350 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in |
| 351 | * use of the video_device array. |
| 352 | * |
| 353 | * Returns a free index number. |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 354 | */ |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 355 | static int get_index(struct video_device *vdev) |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 356 | { |
Hans Verkuil | 775a05d | 2009-02-14 11:31:01 -0300 | [diff] [blame] | 357 | /* This can be static since this function is called with the global |
| 358 | videodev_lock held. */ |
| 359 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 360 | int i; |
| 361 | |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 362 | /* Some drivers do not set the parent. In that case always return 0. */ |
Hans Verkuil | 806e5b7 | 2008-12-19 09:10:56 -0300 | [diff] [blame] | 363 | if (vdev->parent == NULL) |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 364 | return 0; |
Hans Verkuil | 775a05d | 2009-02-14 11:31:01 -0300 | [diff] [blame] | 365 | |
| 366 | bitmap_zero(used, VIDEO_NUM_DEVICES); |
Hans Verkuil | 806e5b7 | 2008-12-19 09:10:56 -0300 | [diff] [blame] | 367 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 368 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
| 369 | if (video_device[i] != NULL && |
Hans Verkuil | 5e85e73 | 2008-07-20 06:31:39 -0300 | [diff] [blame] | 370 | video_device[i]->parent == vdev->parent) { |
Hans Verkuil | 775a05d | 2009-02-14 11:31:01 -0300 | [diff] [blame] | 371 | set_bit(video_device[i]->index, used); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 372 | } |
| 373 | } |
| 374 | |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 375 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 376 | } |
| 377 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 378 | /** |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 379 | * video_register_device - register video4linux devices |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 380 | * @vdev: video device structure we want to register |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 381 | * @type: type of device to register |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 382 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 383 | * -1 == first free) |
Hans Verkuil | 6b5270d | 2009-09-06 07:54:00 -0300 | [diff] [blame] | 384 | * @warn_if_nr_in_use: warn if the desired device node number |
| 385 | * was already in use and another number was chosen instead. |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 386 | * |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 387 | * The registration code assigns minor numbers and device node numbers |
| 388 | * based on the requested type and registers the new device node with |
| 389 | * the kernel. |
| 390 | * An error is returned if no free minor or device node number could be |
| 391 | * found, or if the registration of the device node failed. |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 392 | * |
| 393 | * Zero is returned on success. |
| 394 | * |
| 395 | * Valid types are |
| 396 | * |
| 397 | * %VFL_TYPE_GRABBER - A frame grabber |
| 398 | * |
| 399 | * %VFL_TYPE_VTX - A teletext device |
| 400 | * |
| 401 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) |
| 402 | * |
| 403 | * %VFL_TYPE_RADIO - A radio card |
| 404 | */ |
Hans Verkuil | 6b5270d | 2009-09-06 07:54:00 -0300 | [diff] [blame] | 405 | static int __video_register_device(struct video_device *vdev, int type, int nr, |
| 406 | int warn_if_nr_in_use) |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 407 | { |
| 408 | int i = 0; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 409 | int ret; |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 410 | int minor_offset = 0; |
| 411 | int minor_cnt = VIDEO_NUM_DEVICES; |
| 412 | const char *name_base; |
Anatolij Gustschin | 1bb6419 | 2010-07-01 14:21:39 -0300 | [diff] [blame] | 413 | void *priv = vdev->dev.p; |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 414 | |
| 415 | /* A minor value of -1 marks this video device as never |
| 416 | having been registered */ |
Trent Piepho | 428c8d1 | 2009-03-03 18:51:52 -0300 | [diff] [blame] | 417 | vdev->minor = -1; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 418 | |
Hans Verkuil | d6e7497 | 2008-08-23 06:27:59 -0300 | [diff] [blame] | 419 | /* the release callback MUST be present */ |
Trent Piepho | 428c8d1 | 2009-03-03 18:51:52 -0300 | [diff] [blame] | 420 | WARN_ON(!vdev->release); |
| 421 | if (!vdev->release) |
Henrik Kretzschmar | ee7aa9f | 2008-08-22 16:41:03 -0300 | [diff] [blame] | 422 | return -EINVAL; |
| 423 | |
Sakari Ailus | 1babcb4 | 2010-03-23 09:25:26 -0300 | [diff] [blame] | 424 | /* v4l2_fh support */ |
| 425 | spin_lock_init(&vdev->fh_lock); |
| 426 | INIT_LIST_HEAD(&vdev->fh_list); |
| 427 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 428 | /* Part 1: check device type */ |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 429 | switch (type) { |
| 430 | case VFL_TYPE_GRABBER: |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 431 | name_base = "video"; |
| 432 | break; |
| 433 | case VFL_TYPE_VTX: |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 434 | name_base = "vtx"; |
| 435 | break; |
| 436 | case VFL_TYPE_VBI: |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 437 | name_base = "vbi"; |
| 438 | break; |
| 439 | case VFL_TYPE_RADIO: |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 440 | name_base = "radio"; |
| 441 | break; |
| 442 | default: |
| 443 | printk(KERN_ERR "%s called with unknown type: %d\n", |
| 444 | __func__, type); |
Henrik Kretzschmar | 46f2c21 | 2008-09-03 16:47:39 -0300 | [diff] [blame] | 445 | return -EINVAL; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 446 | } |
| 447 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 448 | vdev->vfl_type = type; |
| 449 | vdev->cdev = NULL; |
Hans Verkuil | 11bbc1c | 2010-05-16 09:24:06 -0300 | [diff] [blame] | 450 | if (vdev->v4l2_dev) { |
| 451 | if (vdev->v4l2_dev->dev) |
| 452 | vdev->parent = vdev->v4l2_dev->dev; |
| 453 | if (vdev->ctrl_handler == NULL) |
| 454 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; |
| 455 | } |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 456 | |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 457 | /* Part 2: find a free minor, device node number and device index. */ |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 458 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
| 459 | /* Keep the ranges for the first four types for historical |
| 460 | * reasons. |
| 461 | * Newer devices (not yet in place) should use the range |
| 462 | * of 128-191 and just pick the first free minor there |
| 463 | * (new style). */ |
| 464 | switch (type) { |
| 465 | case VFL_TYPE_GRABBER: |
| 466 | minor_offset = 0; |
| 467 | minor_cnt = 64; |
| 468 | break; |
| 469 | case VFL_TYPE_RADIO: |
| 470 | minor_offset = 64; |
| 471 | minor_cnt = 64; |
| 472 | break; |
| 473 | case VFL_TYPE_VTX: |
| 474 | minor_offset = 192; |
| 475 | minor_cnt = 32; |
| 476 | break; |
| 477 | case VFL_TYPE_VBI: |
| 478 | minor_offset = 224; |
| 479 | minor_cnt = 32; |
| 480 | break; |
| 481 | default: |
| 482 | minor_offset = 128; |
| 483 | minor_cnt = 64; |
| 484 | break; |
| 485 | } |
| 486 | #endif |
| 487 | |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 488 | /* Pick a device node number */ |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 489 | mutex_lock(&videodev_lock); |
Hans Verkuil | 5062cb7 | 2009-09-07 03:40:24 -0300 | [diff] [blame] | 490 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 491 | if (nr == minor_cnt) |
Hans Verkuil | 5062cb7 | 2009-09-07 03:40:24 -0300 | [diff] [blame] | 492 | nr = devnode_find(vdev, 0, minor_cnt); |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 493 | if (nr == minor_cnt) { |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 494 | printk(KERN_ERR "could not get a free device node number\n"); |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 495 | mutex_unlock(&videodev_lock); |
| 496 | return -ENFILE; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 497 | } |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 498 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 499 | /* 1-on-1 mapping of device node number to minor number */ |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 500 | i = nr; |
| 501 | #else |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 502 | /* The device node number and minor numbers are independent, so |
| 503 | we just find the first free minor number. */ |
Hans Verkuil | dd89601 | 2008-10-04 08:36:54 -0300 | [diff] [blame] | 504 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
| 505 | if (video_device[i] == NULL) |
| 506 | break; |
| 507 | if (i == VIDEO_NUM_DEVICES) { |
| 508 | mutex_unlock(&videodev_lock); |
| 509 | printk(KERN_ERR "could not get a free minor\n"); |
| 510 | return -ENFILE; |
| 511 | } |
| 512 | #endif |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 513 | vdev->minor = i + minor_offset; |
| 514 | vdev->num = nr; |
Hans Verkuil | 5062cb7 | 2009-09-07 03:40:24 -0300 | [diff] [blame] | 515 | devnode_set(vdev); |
| 516 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 517 | /* Should not happen since we thought this minor was free */ |
| 518 | WARN_ON(video_device[vdev->minor] != NULL); |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 519 | vdev->index = get_index(vdev); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 520 | mutex_unlock(&videodev_lock); |
| 521 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 522 | /* Part 3: Initialize the character device */ |
| 523 | vdev->cdev = cdev_alloc(); |
| 524 | if (vdev->cdev == NULL) { |
| 525 | ret = -ENOMEM; |
| 526 | goto cleanup; |
| 527 | } |
| 528 | if (vdev->fops->unlocked_ioctl) |
| 529 | vdev->cdev->ops = &v4l2_unlocked_fops; |
| 530 | else |
| 531 | vdev->cdev->ops = &v4l2_fops; |
| 532 | vdev->cdev->owner = vdev->fops->owner; |
| 533 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 534 | if (ret < 0) { |
| 535 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 536 | kfree(vdev->cdev); |
| 537 | vdev->cdev = NULL; |
| 538 | goto cleanup; |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 539 | } |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 540 | |
| 541 | /* Part 4: register the device with sysfs */ |
| 542 | memset(&vdev->dev, 0, sizeof(vdev->dev)); |
Anatolij Gustschin | 1bb6419 | 2010-07-01 14:21:39 -0300 | [diff] [blame] | 543 | /* The memset above cleared the device's device_private, so |
Hans Verkuil | 9d95af9 | 2008-08-24 11:18:47 -0300 | [diff] [blame] | 544 | put back the copy we made earlier. */ |
Anatolij Gustschin | 1bb6419 | 2010-07-01 14:21:39 -0300 | [diff] [blame] | 545 | vdev->dev.p = priv; |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 546 | vdev->dev.class = &video_class; |
| 547 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); |
| 548 | if (vdev->parent) |
| 549 | vdev->dev.parent = vdev->parent; |
Hans Verkuil | 22e2212 | 2009-09-06 07:13:14 -0300 | [diff] [blame] | 550 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 551 | ret = device_register(&vdev->dev); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 552 | if (ret < 0) { |
| 553 | printk(KERN_ERR "%s: device_register failed\n", __func__); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 554 | goto cleanup; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 555 | } |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 556 | /* Register the release callback that will be called when the last |
| 557 | reference to the device goes away. */ |
| 558 | vdev->dev.release = v4l2_device_release; |
| 559 | |
Hans Verkuil | 6b5270d | 2009-09-06 07:54:00 -0300 | [diff] [blame] | 560 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
Laurent Pinchart | eac8ea5 | 2009-11-27 13:56:50 -0300 | [diff] [blame] | 561 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
| 562 | name_base, nr, video_device_node_name(vdev)); |
Hans Verkuil | 6b5270d | 2009-09-06 07:54:00 -0300 | [diff] [blame] | 563 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 564 | /* Part 5: Activate this minor. The char device can now be used. */ |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 565 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 566 | mutex_lock(&videodev_lock); |
| 567 | video_device[vdev->minor] = vdev; |
| 568 | mutex_unlock(&videodev_lock); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 569 | return 0; |
| 570 | |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 571 | cleanup: |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 572 | mutex_lock(&videodev_lock); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 573 | if (vdev->cdev) |
| 574 | cdev_del(vdev->cdev); |
Hans Verkuil | 5062cb7 | 2009-09-07 03:40:24 -0300 | [diff] [blame] | 575 | devnode_clear(vdev); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 576 | mutex_unlock(&videodev_lock); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 577 | /* Mark this video device as never having been registered. */ |
| 578 | vdev->minor = -1; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 579 | return ret; |
| 580 | } |
Hans Verkuil | 6b5270d | 2009-09-06 07:54:00 -0300 | [diff] [blame] | 581 | |
| 582 | int video_register_device(struct video_device *vdev, int type, int nr) |
| 583 | { |
| 584 | return __video_register_device(vdev, type, nr, 1); |
| 585 | } |
Hans Verkuil | 7ae0cd9 | 2009-06-19 11:32:56 -0300 | [diff] [blame] | 586 | EXPORT_SYMBOL(video_register_device); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 587 | |
Hans Verkuil | 6b5270d | 2009-09-06 07:54:00 -0300 | [diff] [blame] | 588 | int video_register_device_no_warn(struct video_device *vdev, int type, int nr) |
| 589 | { |
| 590 | return __video_register_device(vdev, type, nr, 0); |
| 591 | } |
| 592 | EXPORT_SYMBOL(video_register_device_no_warn); |
| 593 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 594 | /** |
| 595 | * video_unregister_device - unregister a video4linux device |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 596 | * @vdev: the device to unregister |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 597 | * |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 598 | * This unregisters the passed device. Future open calls will |
| 599 | * be met with errors. |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 600 | */ |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 601 | void video_unregister_device(struct video_device *vdev) |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 602 | { |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 603 | /* Check if vdev was ever registered at all */ |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 604 | if (!vdev || !video_is_registered(vdev)) |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 605 | return; |
| 606 | |
Laurent Pinchart | 957b4aa | 2009-11-27 13:57:22 -0300 | [diff] [blame] | 607 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
Hans Verkuil | dc93a70 | 2008-12-19 21:28:27 -0300 | [diff] [blame] | 608 | device_unregister(&vdev->dev); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 609 | } |
| 610 | EXPORT_SYMBOL(video_unregister_device); |
| 611 | |
| 612 | /* |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 613 | * Initialise video for linux |
| 614 | */ |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 615 | static int __init videodev_init(void) |
| 616 | { |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 617 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 618 | int ret; |
| 619 | |
| 620 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 621 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
| 622 | if (ret < 0) { |
| 623 | printk(KERN_WARNING "videodev: unable to get major %d\n", |
| 624 | VIDEO_MAJOR); |
| 625 | return ret; |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | ret = class_register(&video_class); |
| 629 | if (ret < 0) { |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 630 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 631 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
| 632 | return -EIO; |
| 633 | } |
| 634 | |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static void __exit videodev_exit(void) |
| 639 | { |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 640 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
| 641 | |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 642 | class_unregister(&video_class); |
Hans Verkuil | 7f8ecfa | 2008-08-29 17:31:35 -0300 | [diff] [blame] | 643 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | module_init(videodev_init) |
| 647 | module_exit(videodev_exit) |
| 648 | |
| 649 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); |
| 650 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); |
| 651 | MODULE_LICENSE("GPL"); |
Scott James Remnant | cbb72b0 | 2009-03-02 15:40:57 -0300 | [diff] [blame] | 652 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |
Hans Verkuil | 27a5e6d | 2008-07-20 08:43:17 -0300 | [diff] [blame] | 653 | |
| 654 | |
| 655 | /* |
| 656 | * Local variables: |
| 657 | * c-basic-offset: 8 |
| 658 | * End: |
| 659 | */ |