From 39f77adb32b2939a0c5ffd2cbbe0600a0a83e00b Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Thu, 26 Mar 2009 14:31:08 +0000 Subject: allow v4l2 drivers to provide a get_unmapped_area handler MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Daniel Glöckner Shared memory mappings on nommu machines require a get_unmapped_area file operation that suggests an address for the mapping. This patch adds a way for v4l2 drivers to provide this callback. Signed-off-by: Daniel Glöckner Signed-off-by: Mauro Carvalho Chehab --- linux/drivers/media/video/v4l2-dev.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'linux/drivers/media/video/v4l2-dev.c') diff --git a/linux/drivers/media/video/v4l2-dev.c b/linux/drivers/media/video/v4l2-dev.c index 5e9b46c21..2c4d38979 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); @@ -288,6 +305,7 @@ 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 +321,7 @@ 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 -- cgit v1.2.3