static ssize_t show_tabletProductId(struct device *dev, char *buf)
static ssize_t show_tabletProductId(struct device *dev, struct device_attribute *attr, char *buf)
static ssize_t show_tabletProductId(struct device *dev, char *buf){	struct aiptek *aiptek = dev_get_drvdata(dev);	if (aiptek == NULL)		return 0;	return snprintf(buf, PAGE_SIZE, "0x%04x\n",			aiptek->inputdev.id.product);}