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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 19:09:16 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 19:09:16 +0100
commit6a5df38f5f07981dda5457ec6c05efe1c4200d84 (patch)
treed82c3862f7ba719d7723111140a0c89e6387cb19 /Documentation/video4linux/v4l2-framework.txt
parentMerge branch 'akpm' (diff)
parentV4L/DVB (13698): pms: replace asm/uaccess.h to linux/uaccess.h (diff)
downloadlinux-6a5df38f5f07981dda5457ec6c05efe1c4200d84.tar.xz
linux-6a5df38f5f07981dda5457ec6c05efe1c4200d84.zip
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (116 commits) V4L/DVB (13698): pms: replace asm/uaccess.h to linux/uaccess.h V4L/DVB (13690): radio/si470x: #include <sched.h> V4L/DVB (13688): au8522: modify the attributes of local filter coefficients V4L/DVB (13687): cx231xx: use NULL when pointer is needed V4L/DVB: Davinci VPFE Capture: remove unused #include <linux/version.h> V4L/DVB (13685): Correct code taking the size of a pointer V4L/DVB (13684): Fix some cut-and-paste noise in dib0090.h V4L/DVB (13683): sanio-ms: clean up init, exit and id_table V4L/DVB (13682): dib8000: make some constant static V4L/DVB: lgs8gxx: Use shifts rather than multiply/divide when possible V4L/DVB (13680b): DocBook/media: create links for included sources V4L/DVB (13680a): DocBook/media: copy images after building HTML V4L/DVB (13678): Add support for yet another DvbWorld, TeVii and Prof USB devices V4L/DVB (13676): configurable IRQ mode on NetUP Dual DVB-S2 CI; IRQ from CAM processing (CI interface works faster) V4L/DVB (13674): stv090x: Add DiSEqC envelope mode V4L/DVB (13673): lnbp21: Implement 22 kHz tone control V4L/DVB (13671): sh_mobile_ceu_camera: Remove frame size page alignment V4L/DVB (13670): soc-camera: Add mt9t112 camera driver V4L/DVB (13669): tw9910: Add sync polarity support V4L/DVB (13668): tw9910: remove cropping ...
Diffstat (limited to 'Documentation/video4linux/v4l2-framework.txt')
-rw-r--r--Documentation/video4linux/v4l2-framework.txt16
1 files changed, 14 insertions, 2 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index b806edaf3e75..74d677c8b036 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -561,6 +561,8 @@ video_device helper functions
There are a few useful helper functions:
+- file/video_device private data
+
You can set/get driver private data in the video_device struct using:
void *video_get_drvdata(struct video_device *vdev);
@@ -575,8 +577,7 @@ struct video_device *video_devdata(struct file *file);
returns the video_device belonging to the file struct.
-The final helper function combines video_get_drvdata with
-video_devdata:
+The video_drvdata function combines video_get_drvdata with video_devdata:
void *video_drvdata(struct file *file);
@@ -584,6 +585,17 @@ You can go from a video_device struct to the v4l2_device struct using:
struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
+- Device node name
+
+The video_device node kernel name can be retrieved using
+
+const char *video_device_node_name(struct video_device *vdev);
+
+The name is used as a hint by userspace tools such as udev. The function
+should be used where possible instead of accessing the video_device::num and
+video_device::minor fields.
+
+
video buffer helper functions
-----------------------------