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Subject: media: i2c: ov4689: Implement manual color balance controls
Author: Mikhail Rudenko <mike.rude...@gmail.com>
Date: Tue Apr 16 23:45:22 2024 +0100
The OV4689 sensor has separate red and blue gain settings (up to 4x).
Implement appropriate controls in the driver. Default gain values
are not modified.
Signed-off-by: Mikhail Rudenko <mike.rude...@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>
drivers/media/i2c/ov4689.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
index 612ceaaa029c..1d4c5cd975c1 100644
--- a/drivers/media/i2c/ov4689.c
+++ b/drivers/media/i2c/ov4689.c
@@ -56,6 +56,13 @@
#define OV4689_TIMING_FLIP_BOTH (OV4689_TIMING_FLIP_ARRAY |\
OV4689_TIMING_FLIP_DIGITAL)
+#define OV4689_REG_WB_GAIN_RED CCI_REG16(0x500c)
+#define OV4689_REG_WB_GAIN_BLUE CCI_REG16(0x5010)
+#define OV4689_WB_GAIN_MIN 1
+#define OV4689_WB_GAIN_MAX 0xfff
+#define OV4689_WB_GAIN_STEP 1
+#define OV4689_WB_GAIN_DEFAULT 0x400
+
#define OV4689_REG_TEST_PATTERN CCI_REG8(0x5040)
#define OV4689_TEST_PATTERN_ENABLE 0x80
#define OV4689_TEST_PATTERN_DISABLE 0x0
@@ -632,6 +639,12 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_DIGITAL_GAIN:
cci_write(regmap, OV4689_REG_DIG_GAIN, ctrl->val, &ret);
break;
+ case V4L2_CID_RED_BALANCE:
+ cci_write(regmap, OV4689_REG_WB_GAIN_RED, ctrl->val, &ret);
+ break;
+ case V4L2_CID_BLUE_BALANCE:
+ cci_write(regmap, OV4689_REG_WB_GAIN_BLUE, ctrl->val, &ret);
+ break;
default:
dev_warn(dev, "%s Unhandled id:0x%x, val:0x%x\n",
__func__, ctrl->id, ctrl->val);
@@ -662,7 +675,7 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
handler = &ov4689->ctrl_handler;
mode = ov4689->cur_mode;
- ret = v4l2_ctrl_handler_init(handler, 13);
+ ret = v4l2_ctrl_handler_init(handler, 15);
if (ret)
return ret;
@@ -709,6 +722,14 @@ static int ov4689_initialize_controls(struct ov4689
*ov4689)
OV4689_DIG_GAIN_MIN, OV4689_DIG_GAIN_MAX,
OV4689_DIG_GAIN_STEP, OV4689_DIG_GAIN_DEFAULT);
+ v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_RED_BALANCE,
+ OV4689_WB_GAIN_MIN, OV4689_WB_GAIN_MAX,
+ OV4689_WB_GAIN_STEP, OV4689_WB_GAIN_DEFAULT);
+
+ v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_BLUE_BALANCE,
+ OV4689_WB_GAIN_MIN, OV4689_WB_GAIN_MAX,
+ OV4689_WB_GAIN_STEP, OV4689_WB_GAIN_DEFAULT);
+
if (handler->error) {
ret = handler->error;
dev_err(ov4689->dev, "Failed to init controls(%d)\n", ret);
