omap3isp: CCDC black level compensation control

Add a function to modify the black level DC offset for the OMAP3 ISP
CCDC.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/isp/controls.c b/isp/controls.c
index c7ceee2..4dc943f 100644
--- a/isp/controls.c
+++ b/isp/controls.c
@@ -153,6 +153,31 @@ static void matrix_float_to_s12q8(__u16 out[3][3], const struct matrix *in)
 }
 
 /* -----------------------------------------------------------------------------
+ * CCDC parameters configuration
+ */
+
+int omap3_isp_ccdc_set_black_level(struct omap3_isp_device *isp, unsigned int value)
+{
+	struct omap3isp_ccdc_update_config config;
+	struct omap3isp_ccdc_bclamp bclamp;
+	int ret;
+
+	memset(&config, 0, sizeof config);
+	config.update = OMAP3ISP_CCDC_BLCLAMP;
+	config.flag = 0;
+	config.bclamp = &bclamp;
+
+	memset(&bclamp, 0, sizeof bclamp);
+	bclamp.dcsubval = value;
+
+	ret = ioctl(isp->ccdc->fd, VIDIOC_OMAP3ISP_CCDC_CFG, &config);
+	if (ret < 0)
+		return -errno;
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
  * Preview engine parameters configuration
  */