KEYP_SCAN
rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val);
rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val);
rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);