media: ccs: Add digital gain support

CCS supports global (all-component) digital gain. Add support for it.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ccs/ccs-core.c

@@ -670,6 +670,11 @@ static int ccs_set_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_ANALOGUE_GAIN:
 		rval = ccs_write(sensor, ANALOG_GAIN_CODE_GLOBAL, ctrl->val);
 
+		break;
+
+	case V4L2_CID_DIGITAL_GAIN:
+		rval = ccs_write(sensor, DIGITAL_GAIN_GLOBAL, ctrl->val);
+
 		break;
 	case V4L2_CID_EXPOSURE:
 		rval = ccs_write(sensor, COARSE_INTEGRATION_TIME, ctrl->val);
@@ -739,7 +744,7 @@ static int ccs_init_controls(struct ccs_sensor *sensor)
 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
 	int rval;
 
-	rval = v4l2_ctrl_handler_init(&sensor->pixel_array->ctrl_handler, 12);
+	rval = v4l2_ctrl_handler_init(&sensor->pixel_array->ctrl_handler, 13);
 	if (rval)
 		return rval;
 
@@ -753,6 +758,16 @@ static int ccs_init_controls(struct ccs_sensor *sensor)
 		max(CCS_LIM(sensor, ANALOG_GAIN_CODE_STEP), 1U),
 		CCS_LIM(sensor, ANALOG_GAIN_CODE_MIN));
 
+	if (CCS_LIM(sensor, DIGITAL_GAIN_CAPABILITY) ==
+	    CCS_DIGITAL_GAIN_CAPABILITY_GLOBAL)
+		v4l2_ctrl_new_std(&sensor->pixel_array->ctrl_handler,
+				  &ccs_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
+				  CCS_LIM(sensor, DIGITAL_GAIN_MIN),
+				  CCS_LIM(sensor, DIGITAL_GAIN_MAX),
+				  max(CCS_LIM(sensor, DIGITAL_GAIN_STEP_SIZE),
+				      1U),
+				  0x100);
+
 	/* Exposure limits will be updated soon, use just something here. */
 	sensor->exposure = v4l2_ctrl_new_std(
 		&sensor->pixel_array->ctrl_handler, &ccs_ctrl_ops,