static ssize_t show_tabletMouseMiddle(struct device *dev, char *buf)
static ssize_t show_tabletMouseMiddle(struct device *dev, struct device_attribute *attr, char *buf)
static ssize_t show_tabletMouseMiddle(struct device *dev, char *buf){	struct aiptek *aiptek = dev_get_drvdata(dev);	char *s;	if (aiptek == NULL)		return 0;	switch (aiptek->curSetting.mouseButtonMiddle) {	case AIPTEK_MOUSE_LEFT_BUTTON:		s = "left";		break;	case AIPTEK_MOUSE_MIDDLE_BUTTON:		s = "middle";		break;	case AIPTEK_MOUSE_RIGHT_BUTTON:		s = "right";		break;	default:		s = "unknown";		break;	}	return snprintf(buf, PAGE_SIZE, "%s\n", s);}