diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2012-09-26 13:15:24 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-11-28 13:31:14 +0100 |
| commit | 64ae9958a623708336ed67fe38c33571390aed1e (patch) | |
| tree | 5627e3ef1ab2e1dbe6093f60b9705cbe119d41ef /drivers/media | |
| parent | [media] uvcvideo: Mark first output terminal as default video node (diff) | |
| download | linux-64ae9958a623708336ed67fe38c33571390aed1e.tar.xz linux-64ae9958a623708336ed67fe38c33571390aed1e.zip | |
[media] uvcvideo: Fix control value clamping for unsigned integer controls
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.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_ctrl.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 3e0b66efc9ba..516a5b188ea5 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; |