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authorNarendra K <Narendra_K@dell.com>2010-07-26 06:56:50 -0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-07-30 12:36:01 -0400
commit911e1c9b05a8e3559a7aa89083930700a0b9e7ee (patch)
treef0b95455c3808c7732ae819bfbb33332830bae00 /drivers/pci/pci-label.c
parent8633328be242677fdedc42052838dd0608e7f342 (diff)
PCI: export SMBIOS provided firmware instance and label to sysfs
This patch exports SMBIOS provided firmware instance and label of onboard PCI devices to sysfs. New files are: /sys/bus/pci/devices/.../label which contains the firmware name for the device in question, and /sys/bus/pci/devices/.../index which contains the firmware device type instance for the given device. Signed-off-by: Jordan Hargrave <jordan_hargrave@dell.com> Signed-off-by: Narendra K <narendra_k@dell.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-label.c')
-rw-r--r--drivers/pci/pci-label.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
new file mode 100644
index 000000000000..111500e86f94
--- /dev/null
+++ b/drivers/pci/pci-label.c
@@ -0,0 +1,143 @@
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
24enum smbios_attr_enum {
25 SMBIOS_ATTR_NONE = 0,
26 SMBIOS_ATTR_LABEL_SHOW,
27 SMBIOS_ATTR_INSTANCE_SHOW,
28};
29
30static mode_t
31find_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
64static mode_t
65smbios_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
78static ssize_t
79smbioslabel_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
88static ssize_t
89smbiosinstance_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
99static struct device_attribute smbios_attr_label = {
100 .attr = {.name = "label", .mode = 0444, .owner = THIS_MODULE},
101 .show = smbioslabel_show,
102};
103
104static struct device_attribute smbios_attr_instance = {
105 .attr = {.name = "index", .mode = 0444, .owner = THIS_MODULE},
106 .show = smbiosinstance_show,
107};
108
109static struct attribute *smbios_attributes[] = {
110 &smbios_attr_label.attr,
111 &smbios_attr_instance.attr,
112 NULL,
113};
114
115static struct attribute_group smbios_attr_group = {
116 .attrs = smbios_attributes,
117 .is_visible = smbios_instance_string_exist,
118};
119
120static int
121pci_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
128static void
129pci_remove_smbiosname_file(struct pci_dev *pdev)
130{
131 sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
132}
133
134void pci_create_firmware_label_files(struct pci_dev *pdev)
135{
136 if (!pci_create_smbiosname_file(pdev))
137 ;
138}
139
140void pci_remove_firmware_label_files(struct pci_dev *pdev)
141{
142 pci_remove_smbiosname_file(pdev);
143}