I added an entry to a sysfs device (drivers/mtd/nand/omap2.c) like this: static int __devinit omap_nand_probe(struct platform_device *pdev) { ... ... ret = sysfs_create_group(&pdev->dev.kobj, &ef_group); if (ret) { err = -ENOMEM; goto out_free_info; } ... ... } that works, I get the following files: /sys/devices/platform/omap2-nand.0/0xEF/set /sys/devices/platform/omap2-nand.0/0xEF/unset (I added the 0xEF directory and the set and unset files) then in the store function of one of the attributes I do this, in an attempt to get the original pdev back: static ssize_t EF_set_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct kobject *nand_kobj = kobj->parent; struct device *dev = container_of(nand_kobj, struct device, kobj); struct platform_device *pdev = container_of(dev, struct platform_device, dev); printk(KERN_ALERT "pdev is 0x%x\n", (unsigned int)pdev); return count; } but I'm not getting the same address back. Not sure why. thanks, Chris