V4L/DVB (11242): allow v4l2 drivers to provide a get_unmapped_area handler

[linux-2.6-omap-h63xx.git] / drivers / media / video / v4l2-dev.c

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index cdc8ce3c4e567c787c3952e52b8b1ec449db9264..91228b3df07d92f639804c89d1a98953829f6bd9 100644 (file)
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -198,6 +198,23 @@ 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);
@@ -250,6 +267,7 @@ 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
@@ -265,6 +283,7 @@ 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