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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-06-19 22:07:07 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-06-19 22:07:07 +0800 |
| commit | c0b59fafe31bf91f589736be304d739b13952fdd (patch) | |
| tree | 0088a41c6b68132739294643be06734e3af67677 /Documentation/DocBook/media/v4l/vidioc-queryctrl.xml | |
| parent | 28bceeaaf81140d69647acd0eb7dc9312f27844a (diff) | |
| parent | bfa1ce5f38938cc9e6c7f2d1011f88eba2b9e2b2 (diff) | |
Merge branch 'mvebu/drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Merge the mvebu/drivers branch of the arm-soc tree which contains
just a single patch bfa1ce5f38938cc9e6c7f2d1011f88eba2b9e2b2 ("bus:
mvebu-mbus: add mv_mbus_dram_info_nooverlap()") that happens to be
a prerequisite of the new marvell/cesa crypto driver.
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-queryctrl.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-queryctrl.xml | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml index 2bd98fd7a4e5..dc83ad70f8dc 100644 --- a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml +++ b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml @@ -600,7 +600,9 @@ writing a value will cause the device to carry out a given action changes continuously. A typical example would be the current gain value if the device is in auto-gain mode. In such a case the hardware calculates the gain value based on the lighting conditions which can change over time. Note that setting a new value for -a volatile control will have no effect. The new value will just be ignored.</entry> +a volatile control will have no effect and no <constant>V4L2_EVENT_CTRL_CH_VALUE</constant> +will be sent, unless the <constant>V4L2_CTRL_FLAG_EXECUTE_ON_WRITE</constant> flag +(see below) is also set. Otherwise the new value will just be ignored.</entry> </row> <row> <entry><constant>V4L2_CTRL_FLAG_HAS_PAYLOAD</constant></entry> @@ -610,6 +612,14 @@ using one of the pointer fields of &v4l2-ext-control;. This flag is set for cont that are an array, string, or have a compound type. In all cases you have to set a pointer to memory containing the payload of the control.</entry> </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_EXECUTE_ON_WRITE</constant></entry> + <entry>0x0200</entry> + <entry>The value provided to the control will be propagated to the driver +even if remains constant. This is required when the control represents an action +on the hardware. For example: clearing an error flag or triggering the flash. All the +controls of the type <constant>V4L2_CTRL_TYPE_BUTTON</constant> have this flag set.</entry> + </row> </tbody> </tgroup> </table> |