From 18cf8c91ad558f8d2d0177656df493f81949cfe6 Mon Sep 17 00:00:00 2001 From: Antonio Ospite Date: Mon, 1 Mar 2010 08:53:34 -0300 Subject: [PATCH] V4L/DVB: gspca - ov534: Fix and document setting manual exposure MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 --- drivers/media/video/gspca/ov534.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c index 2d89650..4fda098 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); -- 2.7.4