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[media] v4l: uvcvideo: Add support for pan/tilt speed controls 

Map V4L2_CID_TILT_SPEED and V4L2_CID_PAN_SPEED to the standard UVC
CT_PANTILT_RELATIVE_CONTROL terminal control request.

Tested by plugging a Logitech ConferenceCam C3000e USB camera
and controlling pan/tilt from the userspace using the VIDIOC_S_CTRL ioctl.
Verified that it can pan and tilt at the same time in both directions.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Vincent Palatin 2014-09-03 21:47:48 -03:00 committed by Mauro Carvalho Chehab
parent e3d6eb1c16
commit 3ea375239c
1 changed files with 55 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/media/usb/uvc/uvc_ctrl.c
View File

@ -309,9 +309,8 @@ static struct uvc_control_info uvc_ctrls[] = {
.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
.index = 12,
.size = 4,
.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
| UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
| UVC_CTRL_FLAG_GET_DEF
.flags = UVC_CTRL_FLAG_SET_CUR
| UVC_CTRL_FLAG_GET_RANGE
| UVC_CTRL_FLAG_AUTO_UPDATE,
},
{
@ -391,6 +390,35 @@ static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
data[2] = min((int)abs(value), 0xff);
}
static __s32 uvc_ctrl_get_rel_speed(struct uvc_control_mapping *mapping,
__u8 query, const __u8 *data)
{
unsigned int first = mapping->offset / 8;
__s8 rel = (__s8)data[first];
switch (query) {
case UVC_GET_CUR:
return (rel == 0) ? 0 : (rel > 0 ? data[first+1]
: -data[first+1]);
case UVC_GET_MIN:
return -data[first+1];
case UVC_GET_MAX:
case UVC_GET_RES:
case UVC_GET_DEF:
default:
return data[first+1];
}
}
static void uvc_ctrl_set_rel_speed(struct uvc_control_mapping *mapping,
__s32 value, __u8 *data)
{
unsigned int first = mapping->offset / 8;
data[first] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
data[first+1] = min_t(int, abs(value), 0xff);
}
static struct uvc_control_mapping uvc_ctrl_mappings[] = {
{
.id = V4L2_CID_BRIGHTNESS,
@ -676,6 +704,30 @@ static struct uvc_control_mapping uvc_ctrl_mappings[] = {
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
},
{
.id = V4L2_CID_PAN_SPEED,
.name = "Pan (Speed)",
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
.get = uvc_ctrl_get_rel_speed,
.set = uvc_ctrl_set_rel_speed,
},
{
.id = V4L2_CID_TILT_SPEED,
.name = "Tilt (Speed)",
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
.size = 16,
.offset = 16,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
.get = uvc_ctrl_get_rel_speed,
.set = uvc_ctrl_set_rel_speed,
},
{
.id = V4L2_CID_PRIVACY,
.name = "Privacy",