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| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-26 14:31:08 +0000 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-26 14:31:08 +0000 |
| commit | 39f77adb32b2939a0c5ffd2cbbe0600a0a83e00b (patch) | |
| tree | 47e05bb5540a16acff6c8305b81a9fcbf1eb3445 | |
| parent | b522fa7672e6981c4b6649106e2ce67e9a512670 (diff) | |
| download | mediapointer-dvb-s2-39f77adb32b2939a0c5ffd2cbbe0600a0a83e00b.tar.gz mediapointer-dvb-s2-39f77adb32b2939a0c5ffd2cbbe0600a0a83e00b.tar.bz2 | |
allow v4l2 drivers to provide a get_unmapped_area handler
From: Daniel Glöckner <dg@emlix.com>
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 <dg@emlix.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | linux/drivers/media/video/v4l2-dev.c | 19 | ||||
| -rw-r--r-- | linux/include/media/v4l2-dev.h | 2 |
2 files changed, 21 insertions, 0 deletions
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 diff --git a/linux/include/media/v4l2-dev.h b/linux/include/media/v4l2-dev.h index 96b4ea2d9..978e26506 100644 --- a/linux/include/media/v4l2-dev.h +++ b/linux/include/media/v4l2-dev.h @@ -40,6 +40,8 @@ struct v4l2_file_operations { unsigned int (*poll) (struct file *, struct poll_table_struct *); long (*ioctl) (struct file *, unsigned int, unsigned long); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); + unsigned long (*get_unmapped_area) (struct file *, unsigned long, + unsigned long, unsigned long, unsigned long); int (*mmap) (struct file *, struct vm_area_struct *); int (*open) (struct file *); int (*release) (struct file *); |