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authorSylwester Nawrocki <s.nawrocki@samsung.com>2011-09-04 19:08:54 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-11-03 18:29:09 -0200
commitd26a6635b24210791cf4b71fd861738270c8cc3c (patch)
tree2f5a40c24c58a456bf6882b372f8d7620cb9d9b0
parent2e56d933fd967a72d5ee4250e1cb6f9de29d936f (diff)
[media] v4l: Add AUTO option for the V4L2_CID_POWER_LINE_FREQUENCY control
V4L2_CID_POWER_LINE_FREQUENCY control allows applications to instruct a driver what is the power line frequency so an appropriate filter can be used by the device to cancel flicker by compensating the light intensity ripple. Currently in the menu we have entries for 50 Hz and 60 Hz and for entirely disabling the anti-flicker filter. However some devices are capable of automatically detecting the frequency, so add V4L2_CID_POWER_LINE_FREQUENCY_AUTO entry for them. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--Documentation/DocBook/media/v4l/controls.xml5
-rw-r--r--drivers/media/video/v4l2-ctrls.c1
-rw-r--r--include/linux/videodev2.h1
3 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index 23fdf79f8cf3..3bc5ee8b2c74 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -232,8 +232,9 @@ control is deprecated. New drivers and applications should use the
<entry>Enables a power line frequency filter to avoid
flicker. Possible values for <constant>enum v4l2_power_line_frequency</constant> are:
<constant>V4L2_CID_POWER_LINE_FREQUENCY_DISABLED</constant> (0),
-<constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1) and
-<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2).</entry>
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1),
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2) and
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_AUTO</constant> (3).</entry>
</row>
<row>
<entry><constant>V4L2_CID_HUE_AUTO</constant></entry>
diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index fc8666ae408f..5552f8137571 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -210,6 +210,7 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
"Disabled",
"50 Hz",
"60 Hz",
+ "Auto",
NULL
};
static const char * const camera_exposure_auto[] = {
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 66945a6f628d..4b752d5ee80e 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1169,6 +1169,7 @@ enum v4l2_power_line_frequency {
V4L2_CID_POWER_LINE_FREQUENCY_DISABLED = 0,
V4L2_CID_POWER_LINE_FREQUENCY_50HZ = 1,
V4L2_CID_POWER_LINE_FREQUENCY_60HZ = 2,
+ V4L2_CID_POWER_LINE_FREQUENCY_AUTO = 3,
};
#define V4L2_CID_HUE_AUTO (V4L2_CID_BASE+25)
#define V4L2_CID_WHITE_BALANCE_TEMPERATURE (V4L2_CID_BASE+26)