[PATCH 32/57] media: atomisp: ov2680: Add exposure and gain controls

Hans de Goede
2023-01-23T12:55:08Z

Add exposure and gain controls. This allows controlling
the exposure and gain through standard v4l2 IOCTLs.

Note the register defines for the exposure and gain registers
are renamed to match the datasheet.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
.../media/atomisp/i2c/atomisp-ov2680.c | 27 +++++++++++++++----
drivers/staging/media/atomisp/i2c/ov2680.h | 9 +++----
2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
index d508c02444eb..14002a1c22d2 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
@@ -117,6 +117,16 @@ static int ov2680_set_hflip(struct ov2680_device *sensor, s32 val)
return 0;
}

+static int ov2680_exposure_set(struct ov2680_device *sensor, u32 exp)
+{
+ return ovxxxx_write_reg24(sensor->client, OV2680_REG_EXPOSURE_PK_HIGH, exp << 4);
+}
+
+static int ov2680_gain_set(struct ov2680_device *sensor, u32 gain)
+{
+ return ovxxxx_write_reg16(sensor->client, OV2680_REG_GAIN_PK, gain);
+}
+
static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
@@ -135,6 +145,12 @@ static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_HFLIP:
ret = ov2680_set_hflip(sensor, ctrl->val);
break;
+ case V4L2_CID_EXPOSURE:
+ ret = ov2680_exposure_set(sensor, ctrl->val);
+ break;
+ case V4L2_CID_GAIN:
+ ret = ov2680_gain_set(sensor, ctrl->val);
+ break;
default:
ret = -EINVAL;
}
@@ -392,10 +408,7 @@ static int ov2680_set_fmt(struct v4l2_subdev *sd,
goto err;
}

- /*
- * recall flip functions to avoid flip registers
- * were overridden by default setting
- */
+ /* Restore value of all ctrls */
ret = __v4l2_ctrl_handler_setup(&dev->ctrls.handler);
if (ret < 0)
goto err;
@@ -634,13 +647,17 @@ static int ov2680_init_controls(struct ov2680_device *sensor)
const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
struct ov2680_ctrls *ctrls = &sensor->ctrls;
struct v4l2_ctrl_handler *hdl = &ctrls->handler;
+ int exp_max = sensor->res->lines_per_frame - OV2680_INTEGRATION_TIME_MARGIN;

- v4l2_ctrl_handler_init(hdl, 2);
+ v4l2_ctrl_handler_init(hdl, 4);

hdl->lock = &sensor->input_lock;

ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
+ ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
+ 0, exp_max, 1, exp_max);
+ ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 1023, 1, 250);

ctrls->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
ctrls->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
diff --git a/drivers/staging/media/atomisp/i2c/ov2680.h b/drivers/staging/media/atomisp/i2c/ov2680.h
index 45eb1f93b847..e3ad20a7ffd5 100644
--- a/drivers/staging/media/atomisp/i2c/ov2680.h
+++ b/drivers/staging/media/atomisp/i2c/ov2680.h
@@ -90,11 +90,8 @@

#define OV2680_GROUP_ACCESS 0x3208 /*Bit[7:4] Group control, Bit[3:0] Group ID*/

-#define OV2680_EXPOSURE_H 0x3500 /*Bit[3:0] Bit[19:16] of exposure, remaining 16 bits lies in Reg0x3501&Reg0x3502*/
-#define OV2680_EXPOSURE_M 0x3501
-#define OV2680_EXPOSURE_L 0x3502
-#define OV2680_AGC_H 0x350A /*Bit[1:0] means Bit[9:8] of gain*/
-#define OV2680_AGC_L 0x350B /*Bit[7:0] of gain*/
+#define OV2680_REG_EXPOSURE_PK_HIGH 0x3500
+#define OV2680_REG_GAIN_PK 0x350a

#define OV2680_HORIZONTAL_START_H 0x3800 /*Bit[11:8]*/
#define OV2680_HORIZONTAL_START_L 0x3801 /*Bit[7:0]*/
@@ -172,6 +169,8 @@ struct ov2680_device {
struct v4l2_ctrl_handler handler;
struct v4l2_ctrl *hflip;
struct v4l2_ctrl *vflip;
+ struct v4l2_ctrl *exposure;
+ struct v4l2_ctrl *gain;
} ctrls;
};

--
2.39.0