/* * 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); }