V4L2 integer controls are stored in signed 32-bit values. However, UVC
controls can be either signed or unsigned. Take the UVC control
signedness into account when clamping the control value to the min-max
range.
Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
drivers/media/usb/uvc/uvc_ctrl.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
Hi James,
Does this patch fix your problem ?
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 3e0b66e..516a5b1 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1455,8 +1455,12 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
if (step == 0)
step = 1;
- xctrl->value = min + (xctrl->value - min + step/2) / step *
step;
- xctrl->value = clamp(xctrl->value, min, max);
+ xctrl->value = min + ((u32)(xctrl->value - min) + step / 2)
+ / step * step;
+ if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
+ xctrl->value = clamp(xctrl->value, min, max);
+ else
+ xctrl->value = clamp_t(u32, xctrl->value, min, max);
value = xctrl->value;
break;
--
Regards,
Laurent Pinchart
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