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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 20:35:10 -0500 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 20:35:10 -0500 |
commit | 21fbd5809ad126b949206d78e0a0e07ec872ea11 (patch) | |
tree | a824045df99fc1f0690095a925cceb50207e332b /Documentation/video4linux/v4l2-controls.txt | |
parent | d9978ec5680059d727b39d6c706777c6973587f2 (diff) | |
parent | ed72d37a33fdf43dc47787fe220532cdec9da528 (diff) |
Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
- Some cleanups at V4L2 documentation
- new drivers: ts2020 frontend, ov9650 sensor, s5c73m3 sensor,
sh-mobile veu mem2mem driver, radio-ma901, davinci_vpfe staging
driver
- Lots of missing MAINTAINERS entries added
- several em28xx driver improvements, including its conversion to
videobuf2
- several fixups on drivers to make them to better comply with the API
- DVB core: add support for DVBv5 stats, allowing the implementation of
statistics for new standards like ISDB
- mb86a20s: add statistics to the driver
- lots of new board additions, cleanups, and driver improvements.
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (596 commits)
[media] media: Add 0x3009 USB PID to ttusb2 driver (fixed diff)
[media] rtl28xxu: Add USB IDs for Compro VideoMate U620F
[media] em28xx: add usb id for terratec h5 rev. 3
[media] media: rc: gpio-ir-recv: add support for device tree parsing
[media] mceusb: move check earlier to make smatch happy
[media] radio-si470x doc: add info about v4l2-ctl and sox+alsa
[media] staging: media: Remove unnecessary OOM messages
[media] sh_vou: Use vou_dev instead of vou_file wherever possible
[media] sh_vou: Use video_drvdata()
[media] drivers/media/platform/soc_camera/pxa_camera.c: use devm_ functions
[media] mt9t112: mt9t111 format set up differs from mt9t112
[media] sh-mobile-ceu-camera: fix SHARPNESS control default
Revert "[media] fc0011: Return early, if the frequency is already tuned"
[media] cx18/ivtv: fix regression: remove __init from a non-init function
[media] em28xx: fix analog streaming with USB bulk transfers
[media] stv0900: remove unnecessary null pointer check
[media] fc0011: Return early, if the frequency is already tuned
[media] fc0011: Add some sanity checks and cleanups
[media] fc0011: Fix xin value clamping
Revert "[media] [PATH,1/2] mxl5007 move reset to attach"
...
Diffstat (limited to 'Documentation/video4linux/v4l2-controls.txt')
-rw-r--r-- | Documentation/video4linux/v4l2-controls.txt | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index cfe52c798d74..676f87366025 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt | |||
@@ -715,14 +715,20 @@ a control of this type whenever the first control belonging to a new control | |||
715 | class is added. | 715 | class is added. |
716 | 716 | ||
717 | 717 | ||
718 | Proposals for Extensions | 718 | Adding Notify Callbacks |
719 | ======================== | 719 | ======================= |
720 | |||
721 | Sometimes the platform or bridge driver needs to be notified when a control | ||
722 | from a sub-device driver changes. You can set a notify callback by calling | ||
723 | this function: | ||
720 | 724 | ||
721 | Some ideas for future extensions to the spec: | 725 | void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, |
726 | void (*notify)(struct v4l2_ctrl *ctrl, void *priv), void *priv); | ||
722 | 727 | ||
723 | 1) Add a V4L2_CTRL_FLAG_HEX to have values shown as hexadecimal instead of | 728 | Whenever the give control changes value the notify callback will be called |
724 | decimal. Useful for e.g. video_mute_yuv. | 729 | with a pointer to the control and the priv pointer that was passed with |
730 | v4l2_ctrl_notify. Note that the control's handler lock is held when the | ||
731 | notify function is called. | ||
725 | 732 | ||
726 | 2) It is possible to mark in the controls array which controls have been | 733 | There can be only one notify function per control handler. Any attempt |
727 | successfully written and which failed by for example adding a bit to the | 734 | to set another notify function will cause a WARN_ON. |
728 | control ID. Not sure if it is worth the effort, though. | ||