aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pci/pci-label.c
blob: 90c0a729cd3aeed726763a11a24c0dec3c751c5a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*
 * 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);
}