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path: root/drivers/firmware/edd.c
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Diffstat (limited to 'drivers/firmware/edd.c')
-rw-r--r--drivers/firmware/edd.c801
1 files changed, 801 insertions, 0 deletions
diff --git a/drivers/firmware/edd.c b/drivers/firmware/edd.c
new file mode 100644
index 000000000..e22957665
--- /dev/null
+++ b/drivers/firmware/edd.c
@@ -0,0 +1,801 @@
+/*
+ * linux/drivers/firmware/edd.c
+ * Copyright (C) 2002, 2003, 2004 Dell Inc.
+ * by Matt Domsch <Matt_Domsch@dell.com>
+ * disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
+ * legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
+ *
+ * BIOS Enhanced Disk Drive Services (EDD)
+ * conformant to T13 Committee www.t13.org
+ * projects 1572D, 1484D, 1386D, 1226DT
+ *
+ * This code takes information provided by BIOS EDD calls
+ * fn41 - Check Extensions Present and
+ * fn48 - Get Device Parameters with EDD extensions
+ * made in setup.S, copied to safe structures in setup.c,
+ * and presents it in sysfs.
+ *
+ * Please see http://linux.dell.com/edd/results.html for
+ * the list of BIOSs which have been reported to implement EDD.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/limits.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/edd.h>
+
+#define EDD_VERSION "0.16"
+#define EDD_DATE "2004-Jun-25"
+
+MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
+MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(EDD_VERSION);
+
+#define left (PAGE_SIZE - (p - buf) - 1)
+
+struct edd_device {
+ unsigned int index;
+ unsigned int mbr_signature;
+ struct edd_info *info;
+ struct kobject kobj;
+};
+
+struct edd_attribute {
+ struct attribute attr;
+ ssize_t(*show) (struct edd_device * edev, char *buf);
+ int (*test) (struct edd_device * edev);
+};
+
+/* forward declarations */
+static int edd_dev_is_type(struct edd_device *edev, const char *type);
+static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
+
+static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
+
+#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
+struct edd_attribute edd_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode }, \
+ .show = _show, \
+ .test = _test, \
+};
+
+static int
+edd_has_mbr_signature(struct edd_device *edev)
+{
+ return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
+}
+
+static int
+edd_has_edd_info(struct edd_device *edev)
+{
+ return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
+}
+
+static inline struct edd_info *
+edd_dev_get_info(struct edd_device *edev)
+{
+ return edev->info;
+}
+
+static inline void
+edd_dev_set_info(struct edd_device *edev, int i)
+{
+ edev->index = i;
+ if (edd_has_mbr_signature(edev))
+ edev->mbr_signature = edd.mbr_signature[i];
+ if (edd_has_edd_info(edev))
+ edev->info = &edd.edd_info[i];
+}
+
+#define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
+#define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
+
+static ssize_t
+edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
+{
+ struct edd_device *dev = to_edd_device(kobj);
+ struct edd_attribute *edd_attr = to_edd_attr(attr);
+ ssize_t ret = -EIO;
+
+ if (edd_attr->show)
+ ret = edd_attr->show(dev, buf);
+ return ret;
+}
+
+static const struct sysfs_ops edd_attr_ops = {
+ .show = edd_attr_show,
+};
+
+static ssize_t
+edd_show_host_bus(struct edd_device *edev, char *buf)
+{
+ struct edd_info *info;
+ char *p = buf;
+ int i;
+
+ if (!edev)
+ return -EINVAL;
+ info = edd_dev_get_info(edev);
+ if (!info || !buf)
+ return -EINVAL;
+
+ for (i = 0; i < 4; i++) {
+ if (isprint(info->params.host_bus_type[i])) {
+ p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
+ } else {
+ p += scnprintf(p, left, " ");
+ }
+ }
+
+ if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
+ p += scnprintf(p, left, "\tbase_address: %x\n",
+ info->params.interface_path.isa.base_address);
+ } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
+ !strncmp(info->params.host_bus_type, "PCI", 3) ||
+ !strncmp(info->params.host_bus_type, "XPRS", 4)) {
+ p += scnprintf(p, left,
+ "\t%02x:%02x.%d channel: %u\n",
+ info->params.interface_path.pci.bus,
+ info->params.interface_path.pci.slot,
+ info->params.interface_path.pci.function,
+ info->params.interface_path.pci.channel);
+ } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
+ !strncmp(info->params.host_bus_type, "HTPT", 4)) {
+ p += scnprintf(p, left,
+ "\tTBD: %llx\n",
+ info->params.interface_path.ibnd.reserved);
+
+ } else {
+ p += scnprintf(p, left, "\tunknown: %llx\n",
+ info->params.interface_path.unknown.reserved);
+ }
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_interface(struct edd_device *edev, char *buf)
+{
+ struct edd_info *info;
+ char *p = buf;
+ int i;
+
+ if (!edev)
+ return -EINVAL;
+ info = edd_dev_get_info(edev);
+ if (!info || !buf)
+ return -EINVAL;
+
+ for (i = 0; i < 8; i++) {
+ if (isprint(info->params.interface_type[i])) {
+ p += scnprintf(p, left, "%c", info->params.interface_type[i]);
+ } else {
+ p += scnprintf(p, left, " ");
+ }
+ }
+ if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
+ p += scnprintf(p, left, "\tdevice: %u lun: %u\n",
+ info->params.device_path.atapi.device,
+ info->params.device_path.atapi.lun);
+ } else if (!strncmp(info->params.interface_type, "ATA", 3)) {
+ p += scnprintf(p, left, "\tdevice: %u\n",
+ info->params.device_path.ata.device);
+ } else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
+ p += scnprintf(p, left, "\tid: %u lun: %llu\n",
+ info->params.device_path.scsi.id,
+ info->params.device_path.scsi.lun);
+ } else if (!strncmp(info->params.interface_type, "USB", 3)) {
+ p += scnprintf(p, left, "\tserial_number: %llx\n",
+ info->params.device_path.usb.serial_number);
+ } else if (!strncmp(info->params.interface_type, "1394", 4)) {
+ p += scnprintf(p, left, "\teui: %llx\n",
+ info->params.device_path.i1394.eui);
+ } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
+ p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
+ info->params.device_path.fibre.wwid,
+ info->params.device_path.fibre.lun);
+ } else if (!strncmp(info->params.interface_type, "I2O", 3)) {
+ p += scnprintf(p, left, "\tidentity_tag: %llx\n",
+ info->params.device_path.i2o.identity_tag);
+ } else if (!strncmp(info->params.interface_type, "RAID", 4)) {
+ p += scnprintf(p, left, "\tidentity_tag: %x\n",
+ info->params.device_path.raid.array_number);
+ } else if (!strncmp(info->params.interface_type, "SATA", 4)) {
+ p += scnprintf(p, left, "\tdevice: %u\n",
+ info->params.device_path.sata.device);
+ } else {
+ p += scnprintf(p, left, "\tunknown: %llx %llx\n",
+ info->params.device_path.unknown.reserved1,
+ info->params.device_path.unknown.reserved2);
+ }
+
+ return (p - buf);
+}
+
+/**
+ * edd_show_raw_data() - copies raw data to buffer for userspace to parse
+ * @edev: target edd_device
+ * @buf: output buffer
+ *
+ * Returns: number of bytes written, or -EINVAL on failure
+ */
+static ssize_t
+edd_show_raw_data(struct edd_device *edev, char *buf)
+{
+ struct edd_info *info;
+ ssize_t len = sizeof (info->params);
+ if (!edev)
+ return -EINVAL;
+ info = edd_dev_get_info(edev);
+ if (!info || !buf)
+ return -EINVAL;
+
+ if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
+ len = info->params.length;
+
+ /* In case of buggy BIOSs */
+ if (len > (sizeof(info->params)))
+ len = sizeof(info->params);
+
+ memcpy(buf, &info->params, len);
+ return len;
+}
+
+static ssize_t
+edd_show_version(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, "0x%02x\n", info->version);
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_mbr_signature(struct edd_device *edev, char *buf)
+{
+ char *p = buf;
+ p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_extensions(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;
+
+ if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
+ p += scnprintf(p, left, "Fixed disk access\n");
+ }
+ if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
+ p += scnprintf(p, left, "Device locking and ejecting\n");
+ }
+ if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
+ p += scnprintf(p, left, "Enhanced Disk Drive support\n");
+ }
+ if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
+ p += scnprintf(p, left, "64-bit extensions\n");
+ }
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_info_flags(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;
+
+ if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
+ p += scnprintf(p, left, "DMA boundary error transparent\n");
+ if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
+ p += scnprintf(p, left, "geometry valid\n");
+ if (info->params.info_flags & EDD_INFO_REMOVABLE)
+ p += scnprintf(p, left, "removable\n");
+ if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
+ p += scnprintf(p, left, "write verify\n");
+ if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
+ p += scnprintf(p, left, "media change notification\n");
+ if (info->params.info_flags & EDD_INFO_LOCKABLE)
+ p += scnprintf(p, left, "lockable\n");
+ if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
+ p += scnprintf(p, left, "no media present\n");
+ if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
+ p += scnprintf(p, left, "use int13 fn50\n");
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_legacy_max_cylinder(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 += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_legacy_max_head(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 += snprintf(p, left, "%u\n", info->legacy_max_head);
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_legacy_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 += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
+ return (p - buf);
+}
+
+static ssize_t
+edd_show_default_cylinders(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_cylinders);
+ return (p - buf);
+}
+
+static ssize_t
+edd_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_t
+edd_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_t
+edd_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 int
+edd_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 int
+edd_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 int
+edd_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 int
+edd_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 int
+edd_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 int
+edd_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 int
+edd_has_edd30(struct edd_device *edev)
+{
+ struct edd_info *info;
+ int i;
+ u8 csum = 0;
+
+ 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;
+ }
+
+
+ /* We support only T13 spec */
+ if (info->params.device_path_info_length != 44)
+ return 0;
+
+ for (i = 30; i < info->params.device_path_info_length + 30; i++)
+ csum += *(((u8 *)&info->params) + i);
+
+ if (csum)
+ 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 edd_ktype = {
+ .release = edd_release,
+ .sysfs_ops = &edd_attr_ops,
+ .default_attrs = def_attrs,
+};
+
+static struct kset *edd_kset;
+
+
+/**
+ * edd_dev_is_type() - is this EDD device a 'type' device?
+ * @edev: target edd_device
+ * @type: a host bus or interface identifier string per the EDD spec
+ *
+ * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
+ */
+static int
+edd_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") || edd_dev_is_type(edev, "XPRS")) {
+ return pci_get_bus_and_slot(info->params.interface_path.pci.bus,
+ PCI_DEVFN(info->params.interface_path.pci.slot,
+ info->params.interface_path.pci.
+ function));
+ }
+ return NULL;
+}
+
+static int
+edd_create_symlink_to_pcidev(struct edd_device *edev)
+{
+
+ struct pci_dev *pci_dev = edd_get_pci_dev(edev);
+ int ret;
+ if (!pci_dev)
+ return 1;
+ ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
+ pci_dev_put(pci_dev);
+ return ret;
+}
+
+static inline void
+edd_device_unregister(struct edd_device *edev)
+{
+ kobject_put(&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 int
+edd_device_register(struct edd_device *edev, int i)
+{
+ int error;
+
+ if (!edev)
+ return 1;
+ edd_dev_set_info(edev, i);
+ edev->kobj.kset = edd_kset;
+ error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
+ "int13_dev%02x", 0x80 + i);
+ if (!error) {
+ edd_populate_dir(edev);
+ kobject_uevent(&edev->kobj, KOBJ_ADD);
+ }
+ 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 __init
+edd_init(void)
+{
+ 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 -ENODEV;
+ }
+
+ edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
+ if (!edd_kset)
+ return -ENOMEM;
+
+ for (i = 0; i < edd_num_devices(); i++) {
+ edev = kzalloc(sizeof (*edev), GFP_KERNEL);
+ if (!edev) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ rc = edd_device_register(edev, i);
+ if (rc) {
+ kfree(edev);
+ goto out;
+ }
+ edd_devices[i] = edev;
+ }
+
+ return 0;
+
+out:
+ while (--i >= 0)
+ edd_device_unregister(edd_devices[i]);
+ kset_unregister(edd_kset);
+ return rc;
+}
+
+static void __exit
+edd_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);
+ }
+ kset_unregister(edd_kset);
+}
+
+late_initcall(edd_init);
+module_exit(edd_exit);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 12:32:47 +0000