forked from luck/tmp_suning_uos_patched
[media] v4l2-controls.txt: update to latest v4l2-ctrl.c changes
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -277,16 +277,13 @@ implement g_volatile_ctrl like this:
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{
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switch (ctrl->id) {
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case V4L2_CID_BRIGHTNESS:
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ctrl->cur.val = read_reg(0x123);
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ctrl->val = read_reg(0x123);
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break;
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}
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}
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The 'new value' union is not used in g_volatile_ctrl. In general controls
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that need to implement g_volatile_ctrl are read-only controls.
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Note that if one or more controls in a control cluster are marked as volatile,
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then all the controls in the cluster are seen as volatile.
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Note that you use the 'new value' union as well in g_volatile_ctrl. In general
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controls that need to implement g_volatile_ctrl are read-only controls.
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To mark a control as volatile you have to set the is_volatile flag:
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@ -636,9 +633,7 @@ button controls are write-only controls.
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-EINVAL as the spec says.
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5) The spec does not mention what should happen when you try to set/get a
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control class controls. ivtv currently returns -EINVAL (indicating that the
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control ID does not exist) while the framework will return -EACCES, which
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makes more sense.
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control class controls. The framework will return -EACCES.
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Proposals for Extensions
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