lp855x_write_byte
ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val);
ret = lp855x_write_byte(lp, addr, val);
return lp855x_write_byte(lp, lp->cfg->reg_brightness,
return lp855x_write_byte(lp, reg, tmp);