p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);	return (p - buf);}static ssize_tedd_show_default_heads(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += scnprintf(p, left, "%u\n", info->params.num_default_heads);	return (p - buf);}static ssize_tedd_show_default_sectors_per_track(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);	return (p - buf);}static ssize_tedd_show_sectors(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);	return (p - buf);}/* * Some device instances may not have all the above attributes, * or the attribute values may be meaningless (i.e. if * the device is < EDD 3.0, it won't have host_bus and interface * information), so don't bother making files for them.  Likewise * if the default_{cylinders,heads,sectors_per_track} values * are zero, the BIOS doesn't provide sane values, don't bother * creating files for them either. */static intedd_has_legacy_max_cylinder(struct edd_device *edev){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	return info->legacy_max_cylinder > 0;}static intedd_has_legacy_max_head(struct edd_device *edev){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	return info->legacy_max_head > 0;}static intedd_has_legacy_sectors_per_track(struct edd_device *edev){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	return info->legacy_sectors_per_track > 0;}static intedd_has_default_cylinders(struct edd_device *edev){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	return info->params.num_default_cylinders > 0;}static intedd_has_default_heads(struct edd_device *edev){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	return info->params.num_default_heads > 0;}static intedd_has_default_sectors_per_track(struct edd_device *edev){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	return info->params.sectors_per_track > 0;}static intedd_has_edd30(struct edd_device *edev){	struct edd_info *info;	int i, nonzero_path = 0;	char c;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (!info)		return 0;	if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {		return 0;	}	for (i = 30; i <= 73; i++) {		c = *(((uint8_t *) info) + i + 4);		if (c) {			nonzero_path++;			break;		}	}	if (!nonzero_path) {		return 0;	}	return 1;}static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,                       edd_show_legacy_max_cylinder,		       edd_has_legacy_max_cylinder);static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,		       edd_has_legacy_max_head);static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,                       edd_show_legacy_sectors_per_track,		       edd_has_legacy_sectors_per_track);static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,		       edd_has_default_cylinders);static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,		       edd_has_default_heads);static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,		       edd_show_default_sectors_per_track,		       edd_has_default_sectors_per_track);static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);/* These are default attributes that are added for every edd * device discovered.  There are none. */static struct attribute * def_attrs[] = {	NULL,};/* These attributes are conditional and only added for some devices. */static struct edd_attribute * edd_attrs[] = {	&edd_attr_raw_data,	&edd_attr_version,	&edd_attr_extensions,	&edd_attr_info_flags,	&edd_attr_sectors,	&edd_attr_legacy_max_cylinder,	&edd_attr_legacy_max_head,	&edd_attr_legacy_sectors_per_track,	&edd_attr_default_cylinders,	&edd_attr_default_heads,	&edd_attr_default_sectors_per_track,	&edd_attr_interface,	&edd_attr_host_bus,	&edd_attr_mbr_signature,	NULL,};/** *	edd_release - free edd structure *	@kobj:	kobject of edd structure * *	This is called when the refcount of the edd structure *	reaches 0. This should happen right after we unregister, *	but just in case, we use the release callback anyway. */static void edd_release(struct kobject * kobj){	struct edd_device * dev = to_edd_device(kobj);	kfree(dev);}static struct kobj_type ktype_edd = {	.release	= edd_release,	.sysfs_ops	= &edd_attr_ops,	.default_attrs	= def_attrs,};static decl_subsys(edd,&ktype_edd,NULL);/** * edd_dev_is_type() - is this EDD device a 'type' device? * @edev * @type - a host bus or interface identifier string per the EDD spec * * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise. */static intedd_dev_is_type(struct edd_device *edev, const char *type){	struct edd_info *info;	if (!edev)		return 0;	info = edd_dev_get_info(edev);	if (type && info) {		if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||		    !strncmp(info->params.interface_type, type, strlen(type)))			return 1;	}	return 0;}/** * edd_get_pci_dev() - finds pci_dev that matches edev * @edev - edd_device * * Returns pci_dev if found, or NULL */static struct pci_dev *edd_get_pci_dev(struct edd_device *edev){	struct edd_info *info = edd_dev_get_info(edev);	if (edd_dev_is_type(edev, "PCI")) {		return pci_find_slot(info->params.interface_path.pci.bus,				     PCI_DEVFN(info->params.interface_path.pci.slot,					       info->params.interface_path.pci.					       function));	}	return NULL;}static intedd_create_symlink_to_pcidev(struct edd_device *edev){	struct pci_dev *pci_dev = edd_get_pci_dev(edev);	if (!pci_dev)		return 1;	return sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");}static inline voidedd_device_unregister(struct edd_device *edev){	kobject_unregister(&edev->kobj);}static void edd_populate_dir(struct edd_device * edev){	struct edd_attribute * attr;	int error = 0;	int i;	for (i = 0; (attr = edd_attrs[i]) && !error; i++) {		if (!attr->test ||		    (attr->test && attr->test(edev)))			error = sysfs_create_file(&edev->kobj,&attr->attr);	}	if (!error) {		edd_create_symlink_to_pcidev(edev);	}}static intedd_device_register(struct edd_device *edev, int i){	int error;	if (!edev)		return 1;	edd_dev_set_info(edev, i);	kobject_set_name(&edev->kobj, "int13_dev%02x",			 0x80 + i);	kobj_set_kset_s(edev,edd_subsys);	error = kobject_register(&edev->kobj);	if (!error)		edd_populate_dir(edev);	return error;}static inline int edd_num_devices(void){	return max_t(unsigned char,		     min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),		     min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));}/** * edd_init() - creates sysfs tree of EDD data */static int __initedd_init(void){	unsigned int i;	int rc=0;	struct edd_device *edev;	printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",	       EDD_VERSION, EDD_DATE, edd_num_devices());	if (!edd_num_devices()) {		printk(KERN_INFO "EDD information not available.\n");		return 1;	}	rc = firmware_register(&edd_subsys);	if (rc)		return rc;	for (i = 0; i < edd_num_devices() && !rc; i++) {		edev = kzalloc(sizeof (*edev), GFP_KERNEL);		if (!edev)			return -ENOMEM;		rc = edd_device_register(edev, i);		if (rc) {			kfree(edev);			break;		}		edd_devices[i] = edev;	}	if (rc)		firmware_unregister(&edd_subsys);	return rc;}static void __exitedd_exit(void){	int i;	struct edd_device *edev;	for (i = 0; i < edd_num_devices(); i++) {		if ((edev = edd_devices[i]))			edd_device_unregister(edev);	}	firmware_unregister(&edd_subsys);}late_initcall(edd_init);module_exit(edd_exit);