1 /*
2 * The PCI Library -- Looking up Names via UDEV and HWDB
3 *
4 * Copyright (c) 2013--2014 Tom Gundersen <[email protected]>
5 * Copyright (c) 2014 Martin Mares <[email protected]>
6 *
7 * Can be freely distributed and used under the terms of the GNU GPL v2+.
8 *
9 * SPDX-License-Identifier: GPL-2.0-or-later
10 */
11
12 #include <string.h>
13
14 #include "internal.h"
15 #include "names.h"
16
17 #ifdef PCI_HAVE_HWDB
18
19 #include <libudev.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22
23 char *
pci_id_hwdb_lookup(struct pci_access * a,int cat,int id1,int id2,int id3,int id4 UNUSED)24 pci_id_hwdb_lookup(struct pci_access *a, int cat, int id1, int id2, int id3, int id4 UNUSED)
25 {
26 char modalias[64];
27 const char *key = NULL;
28
29 const char *disabled = pci_get_param(a, "hwdb.disable");
30 if (disabled && atoi(disabled))
31 return NULL;
32
33 switch (cat)
34 {
35 case ID_VENDOR:
36 sprintf(modalias, "pci:v%08X*", id1);
37 key = "ID_VENDOR_FROM_DATABASE";
38 break;
39 case ID_DEVICE:
40 sprintf(modalias, "pci:v%08Xd%08X*", id1, id2);
41 key = "ID_MODEL_FROM_DATABASE";
42 break;
43 case ID_SUBSYSTEM:
44 /*
45 * There is no udev hwdb key which returns subsystem. Also note that query
46 * modalias "pci:v%08Xd%08Xsv%08Xsd%08X*" matches also hwdb device with
47 * modalias "pci:v%08Xd%08Xsv*sd*" (which is the default modalias), so
48 * there is no way to get information specific for the subsystem.
49 */
50 return NULL;
51 case ID_GEN_SUBSYSTEM:
52 /* There is no udev hwdb key which returns generic subsystem. */
53 return NULL;
54 case ID_CLASS:
55 sprintf(modalias, "pci:v*d*sv*sd*bc%02X*", id1);
56 key = "ID_PCI_CLASS_FROM_DATABASE";
57 break;
58 case ID_SUBCLASS:
59 sprintf(modalias, "pci:v*d*sv*sd*bc%02Xsc%02X*", id1, id2);
60 key = "ID_PCI_SUBCLASS_FROM_DATABASE";
61 break;
62 case ID_PROGIF:
63 sprintf(modalias, "pci:v*d*sv*sd*bc%02Xsc%02Xi%02X*", id1, id2, id3);
64 key = "ID_PCI_INTERFACE_FROM_DATABASE";
65 break;
66 }
67
68 if (key)
69 {
70 if (!a->id_udev_hwdb)
71 {
72 a->debug("Initializing UDEV HWDB\n");
73 a->id_udev = udev_new();
74 a->id_udev_hwdb = udev_hwdb_new(a->id_udev);
75 }
76
77 struct udev_list_entry *entry;
78 udev_list_entry_foreach(entry, udev_hwdb_get_properties_list_entry(a->id_udev_hwdb, modalias, 0))
79 {
80 const char *entry_name = udev_list_entry_get_name(entry);
81 if (entry_name && !strcmp(entry_name, key))
82 {
83 const char *entry_value = udev_list_entry_get_value(entry);
84 if (entry_value)
85 return pci_strdup(a, entry_value);
86 }
87 }
88 }
89
90 return NULL;
91 }
92
93 void
pci_id_hwdb_free(struct pci_access * a)94 pci_id_hwdb_free(struct pci_access *a)
95 {
96 if (a->id_udev_hwdb)
97 {
98 udev_hwdb_unref(a->id_udev_hwdb);
99 a->id_udev_hwdb = NULL;
100 }
101 if (a->id_udev)
102 {
103 udev_unref(a->id_udev);
104 a->id_udev = NULL;
105 }
106 }
107
108 #else
109
110 char *
pci_id_hwdb_lookup(struct pci_access * a UNUSED,int cat UNUSED,int id1 UNUSED,int id2 UNUSED,int id3 UNUSED,int id4 UNUSED)111 pci_id_hwdb_lookup(struct pci_access *a UNUSED, int cat UNUSED, int id1 UNUSED, int id2 UNUSED, int id3 UNUSED, int id4 UNUSED)
112 {
113 return NULL;
114 }
115
116 void
pci_id_hwdb_free(struct pci_access * a UNUSED)117 pci_id_hwdb_free(struct pci_access *a UNUSED)
118 {
119 }
120
121 #endif
122