1 /* 2 * Purpose: Export the firmware instance and label associated with 3 * a pci device to sysfs 4 * Copyright (C) 2010 Dell Inc. 5 * by Narendra K <Narendra_K@dell.com>, 6 * Jordan Hargrave <Jordan_Hargrave@dell.com> 7 * 8 * SMBIOS defines type 41 for onboard pci devices. This code retrieves 9 * the instance number and string from the type 41 record and exports 10 * it to sysfs. 11 * 12 * Please see http://linux.dell.com/wiki/index.php/Oss/libnetdevname for more 13 * information. 14 */ 15 16 #include <linux/dmi.h> 17 #include <linux/sysfs.h> 18 #include <linux/pci.h> 19 #include <linux/pci_ids.h> 20 #include <linux/module.h> 21 #include <linux/device.h> 22 #include "pci.h" 23 24 enum smbios_attr_enum { 25 SMBIOS_ATTR_NONE = 0, 26 SMBIOS_ATTR_LABEL_SHOW, 27 SMBIOS_ATTR_INSTANCE_SHOW, 28 }; 29 30 static mode_t 31 find_smbios_instance_string(struct pci_dev *pdev, char *buf, 32 enum smbios_attr_enum attribute) 33 { 34 const struct dmi_device *dmi; 35 struct dmi_dev_onboard *donboard; 36 int bus; 37 int devfn; 38 39 bus = pdev->bus->number; 40 devfn = pdev->devfn; 41 42 dmi = NULL; 43 while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, 44 NULL, dmi)) != NULL) { 45 donboard = dmi->device_data; 46 if (donboard && donboard->bus == bus && 47 donboard->devfn == devfn) { 48 if (buf) { 49 if (attribute == SMBIOS_ATTR_INSTANCE_SHOW) 50 return scnprintf(buf, PAGE_SIZE, 51 "%d\n", 52 donboard->instance); 53 else if (attribute == SMBIOS_ATTR_LABEL_SHOW) 54 return scnprintf(buf, PAGE_SIZE, 55 "%s\n", 56 dmi->name); 57 } 58 return strlen(dmi->name); 59 } 60 } 61 return 0; 62 } 63 64 static mode_t 65 smbios_instance_string_exist(struct kobject *kobj, struct attribute *attr, 66 int n) 67 { 68 struct device *dev; 69 struct pci_dev *pdev; 70 71 dev = container_of(kobj, struct device, kobj); 72 pdev = to_pci_dev(dev); 73 74 return find_smbios_instance_string(pdev, NULL, SMBIOS_ATTR_NONE) ? 75 S_IRUGO : 0; 76 } 77 78 static ssize_t 79 smbioslabel_show(struct device *dev, struct device_attribute *attr, char *buf) 80 { 81 struct pci_dev *pdev; 82 pdev = to_pci_dev(dev); 83 84 return find_smbios_instance_string(pdev, buf, 85 SMBIOS_ATTR_LABEL_SHOW); 86 } 87 88 static ssize_t 89 smbiosinstance_show(struct device *dev, 90 struct device_attribute *attr, char *buf) 91 { 92 struct pci_dev *pdev; 93 pdev = to_pci_dev(dev); 94 95 return find_smbios_instance_string(pdev, buf, 96 SMBIOS_ATTR_INSTANCE_SHOW); 97 } 98 99 static struct device_attribute smbios_attr_label = { 100 .attr = {.name = "label", .mode = 0444}, 101 .show = smbioslabel_show, 102 }; 103 104 static struct device_attribute smbios_attr_instance = { 105 .attr = {.name = "index", .mode = 0444}, 106 .show = smbiosinstance_show, 107 }; 108 109 static struct attribute *smbios_attributes[] = { 110 &smbios_attr_label.attr, 111 &smbios_attr_instance.attr, 112 NULL, 113 }; 114 115 static struct attribute_group smbios_attr_group = { 116 .attrs = smbios_attributes, 117 .is_visible = smbios_instance_string_exist, 118 }; 119 120 static int 121 pci_create_smbiosname_file(struct pci_dev *pdev) 122 { 123 if (!sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group)) 124 return 0; 125 return -ENODEV; 126 } 127 128 static void 129 pci_remove_smbiosname_file(struct pci_dev *pdev) 130 { 131 sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group); 132 } 133 134 void pci_create_firmware_label_files(struct pci_dev *pdev) 135 { 136 if (!pci_create_smbiosname_file(pdev)) 137 ; 138 } 139 140 void pci_remove_firmware_label_files(struct pci_dev *pdev) 141 { 142 pci_remove_smbiosname_file(pdev); 143 } 144