![Randy Dunlap](/assets/img/avatar_default.png)
Cleanup kernel-doc notation in drivers/firmware/edd.c. Add edd.c to DocBook/kernel-api.tmpl. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Matt Domsch <Matt_Domsch@dell.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
792 lines
20 KiB
C
792 lines
20 KiB
C
/*
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* linux/drivers/firmware/edd.c
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* Copyright (C) 2002, 2003, 2004 Dell Inc.
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* by Matt Domsch <Matt_Domsch@dell.com>
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* disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
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* legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
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*
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* BIOS Enhanced Disk Drive Services (EDD)
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* conformant to T13 Committee www.t13.org
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* projects 1572D, 1484D, 1386D, 1226DT
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*
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* This code takes information provided by BIOS EDD calls
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* fn41 - Check Extensions Present and
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* fn48 - Get Device Parametes with EDD extensions
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* made in setup.S, copied to safe structures in setup.c,
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* and presents it in sysfs.
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*
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* Please see http://linux.dell.com/edd30/results.html for
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* the list of BIOSs which have been reported to implement EDD.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/stat.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <linux/limits.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/blkdev.h>
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#include <linux/edd.h>
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#define EDD_VERSION "0.16"
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#define EDD_DATE "2004-Jun-25"
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MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
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MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(EDD_VERSION);
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#define left (PAGE_SIZE - (p - buf) - 1)
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struct edd_device {
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unsigned int index;
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unsigned int mbr_signature;
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struct edd_info *info;
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struct kobject kobj;
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};
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struct edd_attribute {
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struct attribute attr;
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ssize_t(*show) (struct edd_device * edev, char *buf);
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int (*test) (struct edd_device * edev);
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};
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/* forward declarations */
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static int edd_dev_is_type(struct edd_device *edev, const char *type);
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static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
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static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
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#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
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struct edd_attribute edd_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
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.show = _show, \
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.test = _test, \
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};
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static int
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edd_has_mbr_signature(struct edd_device *edev)
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{
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return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
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}
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static int
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edd_has_edd_info(struct edd_device *edev)
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{
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return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
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}
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static inline struct edd_info *
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edd_dev_get_info(struct edd_device *edev)
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{
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return edev->info;
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}
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static inline void
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edd_dev_set_info(struct edd_device *edev, int i)
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{
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edev->index = i;
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if (edd_has_mbr_signature(edev))
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edev->mbr_signature = edd.mbr_signature[i];
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if (edd_has_edd_info(edev))
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edev->info = &edd.edd_info[i];
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}
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#define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
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#define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
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static ssize_t
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edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
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{
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struct edd_device *dev = to_edd_device(kobj);
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struct edd_attribute *edd_attr = to_edd_attr(attr);
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ssize_t ret = -EIO;
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if (edd_attr->show)
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ret = edd_attr->show(dev, buf);
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return ret;
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}
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static struct sysfs_ops edd_attr_ops = {
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.show = edd_attr_show,
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};
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static ssize_t
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edd_show_host_bus(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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int i;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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for (i = 0; i < 4; i++) {
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if (isprint(info->params.host_bus_type[i])) {
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p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
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} else {
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p += scnprintf(p, left, " ");
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}
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}
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if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
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p += scnprintf(p, left, "\tbase_address: %x\n",
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info->params.interface_path.isa.base_address);
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} else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
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!strncmp(info->params.host_bus_type, "PCI", 3)) {
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p += scnprintf(p, left,
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"\t%02x:%02x.%d channel: %u\n",
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info->params.interface_path.pci.bus,
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info->params.interface_path.pci.slot,
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info->params.interface_path.pci.function,
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info->params.interface_path.pci.channel);
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} else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
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!strncmp(info->params.host_bus_type, "XPRS", 4) ||
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!strncmp(info->params.host_bus_type, "HTPT", 4)) {
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p += scnprintf(p, left,
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"\tTBD: %llx\n",
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info->params.interface_path.ibnd.reserved);
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} else {
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p += scnprintf(p, left, "\tunknown: %llx\n",
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info->params.interface_path.unknown.reserved);
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}
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return (p - buf);
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}
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static ssize_t
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edd_show_interface(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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int i;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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for (i = 0; i < 8; i++) {
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if (isprint(info->params.interface_type[i])) {
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p += scnprintf(p, left, "%c", info->params.interface_type[i]);
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} else {
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p += scnprintf(p, left, " ");
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}
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}
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if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
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p += scnprintf(p, left, "\tdevice: %u lun: %u\n",
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info->params.device_path.atapi.device,
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info->params.device_path.atapi.lun);
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} else if (!strncmp(info->params.interface_type, "ATA", 3)) {
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p += scnprintf(p, left, "\tdevice: %u\n",
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info->params.device_path.ata.device);
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} else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
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p += scnprintf(p, left, "\tid: %u lun: %llu\n",
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info->params.device_path.scsi.id,
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info->params.device_path.scsi.lun);
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} else if (!strncmp(info->params.interface_type, "USB", 3)) {
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p += scnprintf(p, left, "\tserial_number: %llx\n",
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info->params.device_path.usb.serial_number);
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} else if (!strncmp(info->params.interface_type, "1394", 4)) {
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p += scnprintf(p, left, "\teui: %llx\n",
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info->params.device_path.i1394.eui);
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} else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
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p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
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info->params.device_path.fibre.wwid,
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info->params.device_path.fibre.lun);
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} else if (!strncmp(info->params.interface_type, "I2O", 3)) {
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p += scnprintf(p, left, "\tidentity_tag: %llx\n",
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info->params.device_path.i2o.identity_tag);
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} else if (!strncmp(info->params.interface_type, "RAID", 4)) {
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p += scnprintf(p, left, "\tidentity_tag: %x\n",
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info->params.device_path.raid.array_number);
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} else if (!strncmp(info->params.interface_type, "SATA", 4)) {
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p += scnprintf(p, left, "\tdevice: %u\n",
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info->params.device_path.sata.device);
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} else {
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p += scnprintf(p, left, "\tunknown: %llx %llx\n",
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info->params.device_path.unknown.reserved1,
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info->params.device_path.unknown.reserved2);
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}
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return (p - buf);
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}
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/**
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* edd_show_raw_data() - copies raw data to buffer for userspace to parse
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* @edev: target edd_device
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* @buf: output buffer
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*
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* Returns: number of bytes written, or -EINVAL on failure
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*/
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static ssize_t
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edd_show_raw_data(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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ssize_t len = sizeof (info->params);
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
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len = info->params.length;
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/* In case of buggy BIOSs */
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if (len > (sizeof(info->params)))
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len = sizeof(info->params);
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memcpy(buf, &info->params, len);
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return len;
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}
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static ssize_t
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edd_show_version(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += scnprintf(p, left, "0x%02x\n", info->version);
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return (p - buf);
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}
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static ssize_t
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edd_show_mbr_signature(struct edd_device *edev, char *buf)
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{
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char *p = buf;
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p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
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return (p - buf);
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}
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static ssize_t
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edd_show_extensions(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
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p += scnprintf(p, left, "Fixed disk access\n");
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}
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if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
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p += scnprintf(p, left, "Device locking and ejecting\n");
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}
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if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
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p += scnprintf(p, left, "Enhanced Disk Drive support\n");
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}
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if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
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p += scnprintf(p, left, "64-bit extensions\n");
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}
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return (p - buf);
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}
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static ssize_t
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edd_show_info_flags(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
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p += scnprintf(p, left, "DMA boundary error transparent\n");
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if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
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p += scnprintf(p, left, "geometry valid\n");
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if (info->params.info_flags & EDD_INFO_REMOVABLE)
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p += scnprintf(p, left, "removable\n");
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if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
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p += scnprintf(p, left, "write verify\n");
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if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
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p += scnprintf(p, left, "media change notification\n");
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if (info->params.info_flags & EDD_INFO_LOCKABLE)
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p += scnprintf(p, left, "lockable\n");
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if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
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p += scnprintf(p, left, "no media present\n");
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if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
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p += scnprintf(p, left, "use int13 fn50\n");
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return (p - buf);
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}
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static ssize_t
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edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
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return (p - buf);
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}
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static ssize_t
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edd_show_legacy_max_head(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += snprintf(p, left, "%u\n", info->legacy_max_head);
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return (p - buf);
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}
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static ssize_t
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edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
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return (p - buf);
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}
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static ssize_t
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edd_show_default_cylinders(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
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return (p - buf);
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}
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static ssize_t
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edd_show_default_heads(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
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return (p - buf);
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}
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static ssize_t
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edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
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return (p - buf);
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}
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static ssize_t
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edd_show_sectors(struct edd_device *edev, char *buf)
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{
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struct edd_info *info;
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char *p = buf;
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if (!edev)
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return -EINVAL;
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info = edd_dev_get_info(edev);
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if (!info || !buf)
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return -EINVAL;
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p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
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return (p - buf);
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}
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/*
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* Some device instances may not have all the above attributes,
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* or the attribute values may be meaningless (i.e. if
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* the device is < EDD 3.0, it won't have host_bus and interface
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* information), so don't bother making files for them. Likewise
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* if the default_{cylinders,heads,sectors_per_track} values
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* are zero, the BIOS doesn't provide sane values, don't bother
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* creating files for them either.
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*/
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static int
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edd_has_legacy_max_cylinder(struct edd_device *edev)
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{
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struct edd_info *info;
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if (!edev)
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return 0;
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info = edd_dev_get_info(edev);
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if (!info)
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return 0;
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|
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, 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: 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")) {
|
|
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 int
|
|
edd_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 void
|
|
edd_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 int
|
|
edd_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 __init
|
|
edd_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 __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);
|
|
}
|
|
firmware_unregister(&edd_subsys);
|
|
}
|
|
|
|
late_initcall(edd_init);
|
|
module_exit(edd_exit);
|