diff options
Diffstat (limited to 'linux/drivers/media/video/v4l2-dev.c')
| -rw-r--r-- | linux/drivers/media/video/v4l2-dev.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/linux/drivers/media/video/v4l2-dev.c b/linux/drivers/media/video/v4l2-dev.c index 861e3194f..f7e128729 100644 --- a/linux/drivers/media/video/v4l2-dev.c +++ b/linux/drivers/media/video/v4l2-dev.c @@ -236,6 +236,23 @@ static long v4l2_unlocked_ioctl(struct file *filp, return vdev->fops->unlocked_ioctl(filp, cmd, arg); } +#ifdef CONFIG_MMU +#define v4l2_get_unmapped_area NULL +#else +static unsigned long v4l2_get_unmapped_area(struct file *filp, + unsigned long addr, unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + struct video_device *vdev = video_devdata(filp); + + if (!vdev->fops->get_unmapped_area) + return -ENOSYS; + if (video_is_unregistered(vdev)) + return -ENODEV; + return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); +} +#endif + static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) { struct video_device *vdev = video_devdata(filp); @@ -250,7 +267,7 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) static int v4l2_open(struct inode *inode, struct file *filp) { struct video_device *vdev; - int ret; + int ret = 0; /* Check if the video device is available */ mutex_lock(&videodev_lock); @@ -264,7 +281,9 @@ static int v4l2_open(struct inode *inode, struct file *filp) /* and increase the device refcount */ video_get(vdev); mutex_unlock(&videodev_lock); - ret = vdev->fops->open(filp); + if (vdev->fops->open) + ret = vdev->fops->open(filp); + /* decrease the refcount in case of an error */ if (ret) video_put(vdev); @@ -275,7 +294,10 @@ static int v4l2_open(struct inode *inode, struct file *filp) static int v4l2_release(struct inode *inode, struct file *filp) { struct video_device *vdev = video_devdata(filp); - int ret = vdev->fops->release(filp); + int ret = 0; + + if (vdev->fops->release) + vdev->fops->release(filp); /* decrease the refcount unconditionally since the release() return value is ignored. */ @@ -288,6 +310,7 @@ static const struct file_operations v4l2_unlocked_fops = { .read = v4l2_read, .write = v4l2_write, .open = v4l2_open, + .get_unmapped_area = v4l2_get_unmapped_area, .mmap = v4l2_mmap, .unlocked_ioctl = v4l2_unlocked_ioctl, #ifdef CONFIG_COMPAT @@ -303,6 +326,7 @@ static const struct file_operations v4l2_fops = { .read = v4l2_read, .write = v4l2_write, .open = v4l2_open, + .get_unmapped_area = v4l2_get_unmapped_area, .mmap = v4l2_mmap, .ioctl = v4l2_ioctl, #ifdef CONFIG_COMPAT @@ -433,7 +457,7 @@ int video_register_device_index(struct video_device *vdev, int type, int nr, vdev->vfl_type = type; vdev->cdev = NULL; - if (vdev->v4l2_dev) + if (vdev->v4l2_dev && vdev->v4l2_dev->dev) vdev->parent = vdev->v4l2_dev->dev; /* Part 2: find a free minor, kernel number and device index. */ @@ -654,6 +678,7 @@ module_exit(videodev_exit) MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); MODULE_LICENSE("GPL"); +MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); /* |