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/*
* Purpose: Export the firmware instance and label associated with
* a pci device to sysfs
* Copyright (C) 2010 Dell Inc.
* by Narendra K <Narendra_K@dell.com>,
* Jordan Hargrave <Jordan_Hargrave@dell.com>
*
* SMBIOS defines type 41 for onboard pci devices. This code retrieves
* the instance number and string from the type 41 record and exports
* it to sysfs.
*
* Please see http://linux.dell.com/wiki/index.php/Oss/libnetdevname for more
* information.
*/
#include <linux/dmi.h>
#include <linux/sysfs.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/module.h>
#include <linux/device.h>
#include "pci.h"
enum smbios_attr_enum {
SMBIOS_ATTR_NONE = 0,
SMBIOS_ATTR_LABEL_SHOW,
SMBIOS_ATTR_INSTANCE_SHOW,
};
static mode_t
find_smbios_instance_string(struct pci_dev *pdev, char *buf,
enum smbios_attr_enum attribute)
{
const struct dmi_device *dmi;
struct dmi_dev_onboard *donboard;
int bus;
int devfn;
bus = pdev->bus->number;
devfn = pdev->devfn;
dmi = NULL;
while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD,
NULL, dmi)) != NULL) {
donboard = dmi->device_data;
if (donboard && donboard->bus == bus &&
donboard->devfn == devfn) {
if (buf) {
if (attribute == SMBIOS_ATTR_INSTANCE_SHOW)
return scnprintf(buf, PAGE_SIZE,
"%d\n",
donboard->instance);
else if (attribute == SMBIOS_ATTR_LABEL_SHOW)
return scnprintf(buf, PAGE_SIZE,
"%s\n",
dmi->name);
}
return strlen(dmi->name);
}
}
return 0;
}
static mode_t
smbios_instance_string_exist(struct kobject *kobj, struct attribute *attr,
int n)
{
struct device *dev;
struct pci_dev *pdev;
dev = container_of(kobj, struct device, kobj);
pdev = to_pci_dev(dev);
return find_smbios_instance_string(pdev, NULL, SMBIOS_ATTR_NONE) ?
S_IRUGO : 0;
}
static ssize_t
smbioslabel_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev;
pdev = to_pci_dev(dev);
return find_smbios_instance_string(pdev, buf,
SMBIOS_ATTR_LABEL_SHOW);
}
static ssize_t
smbiosinstance_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev;
pdev = to_pci_dev(dev);
return find_smbios_instance_string(pdev, buf,
SMBIOS_ATTR_INSTANCE_SHOW);
}
static struct device_attribute smbios_attr_label = {
.attr = {.name = "label", .mode = 0444},
.show = smbioslabel_show,
};
static struct device_attribute smbios_attr_instance = {
.attr = {.name = "index", .mode = 0444},
.show = smbiosinstance_show,
};
static struct attribute *smbios_attributes[] = {
&smbios_attr_label.attr,
&smbios_attr_instance.attr,
NULL,
};
static struct attribute_group smbios_attr_group = {
.attrs = smbios_attributes,
.is_visible = smbios_instance_string_exist,
};
static int
pci_create_smbiosname_file(struct pci_dev *pdev)
{
if (!sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group))
return 0;
return -ENODEV;
}
static void
pci_remove_smbiosname_file(struct pci_dev *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
}
void pci_create_firmware_label_files(struct pci_dev *pdev)
{
if (!pci_create_smbiosname_file(pdev))
;
}
void pci_remove_firmware_label_files(struct pci_dev *pdev)
{
pci_remove_smbiosname_file(pdev);
}
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