static ssize_t show_tabletStylusLower(struct device *dev, char *buf)
static ssize_t show_tabletStylusLower(struct device *dev, struct device_attribute *attr, char *buf)
static ssize_t show_tabletStylusLower(struct device *dev, char *buf){	struct aiptek *aiptek = dev_get_drvdata(dev);	char *s;	if (aiptek == NULL)		return 0;	switch (aiptek->curSetting.stylusButtonLower) {	case AIPTEK_STYLUS_UPPER_BUTTON:		s = "upper";		break;	case AIPTEK_STYLUS_LOWER_BUTTON:		s = "lower";		break;	default:		s = "unknown";		break;	}	return snprintf(buf, PAGE_SIZE, "%s\n", s);}