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| author | Antonio Ospite <ospite@studenti.unina.it> | 2010-03-01 11:53:34 (GMT) |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-18 03:46:56 (GMT) |
| commit | 18cf8c91ad558f8d2d0177656df493f81949cfe6 (patch) | |
| tree | 92f98683a2c911f1656e239ad20f89a8ab9d29be /drivers | |
| parent | f2938822523739e99a39fd634943865a432e9c00 (diff) | |
| download | linux-fsl-qoriq-18cf8c91ad558f8d2d0177656df493f81949cfe6.tar.xz | |
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 <ospite@studenti.unina.it>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/gspca/ov534.c | 9 |
1 files changed, 9 insertions, 0 deletions
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); |