From: Antonio Ospite Date: Mon, 1 Mar 2010 11:53:34 +0000 (-0300) Subject: V4L/DVB: gspca - ov534: Fix and document setting manual exposure X-Git-Tag: MMI-PSA29.97-13-9~23880^2~375 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=18cf8c91ad558f8d2d0177656df493f81949cfe6;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git V4L/DVB: gspca - ov534: Fix and document setting manual exposure Document that even if the state is a u8 value, both MSB and LSB are set as sd->exposure represents half of the value we are going to set into registers. Skip setting exposure when AEC is enabled. Signed-off-by: Antonio Ospite Signed-off-by: Jean-François Moine Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c index 2d8965003077..4fda0980be04 100644 --- a/drivers/media/video/gspca/ov534.c +++ b/drivers/media/video/gspca/ov534.c @@ -686,6 +686,15 @@ static void setexposure(struct gspca_dev *gspca_dev) struct sd *sd = (struct sd *) gspca_dev; u8 val; + if (sd->aec) + return; + + /* 'val' is one byte and represents half of the exposure value we are + * going to set into registers, a two bytes value: + * + * MSB: ((u16) val << 1) >> 8 == val >> 7 + * LSB: ((u16) val << 1) & 0xff == val << 1 + */ val = sd->exposure; sccb_reg_write(gspca_dev, 0x08, val >> 7); sccb_reg_write(gspca_dev, 0x10, val << 1);