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V4L/DVB (8498): uvcvideo: Return sensible min and max values when querying a boolean control. 

Although the V4L2 spec states that the minimum and maximum fields may not be
valid for control types other than V4L2_CTRL_TYPE_INTEGER, it makes sense
to set the bounds to 0 and 1 for boolean controls instead of returning
uninitialized values.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Laurent Pinchart 2008-07-17 07:37:37 -03:00 committed by Mauro Carvalho Chehab
parent 90ac5ea37f
commit 54812c77bc
1 changed files with 12 additions and 1 deletions
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13
drivers/media/video/uvc/uvc_ctrl.c
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@ -592,6 +592,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
if (ctrl == NULL)
return -EINVAL;
memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
v4l2_ctrl->id = mapping->id;
v4l2_ctrl->type = mapping->v4l2_type;
strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
@ -608,7 +609,8 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
v4l2_ctrl->default_value = uvc_get_le_value(data, mapping);
}
if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
switch (mapping->v4l2_type) {
case V4L2_CTRL_TYPE_MENU:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = mapping->menu_count - 1;
v4l2_ctrl->step = 1;
@ -622,6 +624,15 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
}
return 0;
case V4L2_CTRL_TYPE_BOOLEAN:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = 1;
v4l2_ctrl->step = 1;
return 0;
default:
break;
}
if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {