]>
Commit | Line | Data |
---|---|---|
53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2001208c | 2 | /*** |
8b516fde | 3 | Copyright Tom Gundersen <teg@jklm.no> |
2001208c KS |
4 | ***/ |
5 | ||
8b516fde | 6 | #include "sd-hwdb.h" |
07630cea | 7 | |
b5efdb8a | 8 | #include "alloc-util.h" |
8b516fde | 9 | #include "hwdb-util.h" |
07630cea | 10 | #include "libudev-private.h" |
2001208c KS |
11 | |
12 | /** | |
13 | * SECTION:libudev-hwdb | |
14 | * @short_description: retrieve properties from the hardware database | |
15 | * | |
f2d433e1 | 16 | * Libudev hardware database interface. |
2001208c KS |
17 | */ |
18 | ||
19 | /** | |
20 | * udev_hwdb: | |
21 | * | |
22 | * Opaque object representing the hardware database. | |
23 | */ | |
24 | struct udev_hwdb { | |
25 | struct udev *udev; | |
26 | int refcount; | |
27 | ||
8b516fde | 28 | sd_hwdb *hwdb; |
2001208c KS |
29 | |
30 | struct udev_list properties_list; | |
31 | }; | |
32 | ||
2001208c KS |
33 | /** |
34 | * udev_hwdb_new: | |
35 | * @udev: udev library context | |
36 | * | |
37 | * Create a hardware database context to query properties for devices. | |
38 | * | |
39 | * Returns: a hwdb context. | |
40 | **/ | |
41 | _public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) { | |
4afd3348 | 42 | _cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb_internal = NULL; |
2001208c | 43 | struct udev_hwdb *hwdb; |
8b516fde | 44 | int r; |
2001208c | 45 | |
309f631d | 46 | assert_return_errno(udev, NULL, EINVAL); |
33488f19 | 47 | |
8b516fde | 48 | r = sd_hwdb_new(&hwdb_internal); |
309f631d LP |
49 | if (r < 0) { |
50 | errno = -r; | |
2001208c | 51 | return NULL; |
309f631d | 52 | } |
2001208c | 53 | |
8b516fde | 54 | hwdb = new0(struct udev_hwdb, 1); |
309f631d LP |
55 | if (!hwdb) { |
56 | errno = ENOMEM; | |
2001208c | 57 | return NULL; |
309f631d | 58 | } |
2001208c | 59 | |
8b516fde | 60 | hwdb->refcount = 1; |
1cc6c93a | 61 | hwdb->hwdb = TAKE_PTR(hwdb_internal); |
2001208c | 62 | |
8b516fde | 63 | udev_list_init(udev, &hwdb->properties_list, true); |
2001208c | 64 | |
2001208c KS |
65 | return hwdb; |
66 | } | |
67 | ||
68 | /** | |
69 | * udev_hwdb_ref: | |
70 | * @hwdb: context | |
71 | * | |
72 | * Take a reference of a hwdb context. | |
73 | * | |
74 | * Returns: the passed enumeration context | |
75 | **/ | |
76 | _public_ struct udev_hwdb *udev_hwdb_ref(struct udev_hwdb *hwdb) { | |
77 | if (!hwdb) | |
78 | return NULL; | |
79 | hwdb->refcount++; | |
80 | return hwdb; | |
81 | } | |
82 | ||
83 | /** | |
84 | * udev_hwdb_unref: | |
85 | * @hwdb: context | |
86 | * | |
87 | * Drop a reference of a hwdb context. If the refcount reaches zero, | |
88 | * all resources of the hwdb context will be released. | |
89 | * | |
725d7e6c | 90 | * Returns: #NULL |
2001208c KS |
91 | **/ |
92 | _public_ struct udev_hwdb *udev_hwdb_unref(struct udev_hwdb *hwdb) { | |
93 | if (!hwdb) | |
94 | return NULL; | |
95 | hwdb->refcount--; | |
96 | if (hwdb->refcount > 0) | |
725d7e6c | 97 | return NULL; |
8b516fde | 98 | sd_hwdb_unref(hwdb->hwdb); |
2001208c | 99 | udev_list_cleanup(&hwdb->properties_list); |
5fecf46d | 100 | return mfree(hwdb); |
2001208c KS |
101 | } |
102 | ||
2001208c KS |
103 | /** |
104 | * udev_hwdb_get_properties_list_entry: | |
105 | * @hwdb: context | |
106 | * @modalias: modalias string | |
107 | * @flags: (unused) | |
108 | * | |
109 | * Lookup a matching device in the hardware database. The lookup key is a | |
110 | * modalias string, whose formats are defined for the Linux kernel modules. | |
111 | * Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry | |
112 | * of a list of retrieved properties is returned. | |
113 | * | |
114 | * Returns: a udev_list_entry. | |
115 | */ | |
116 | _public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned int flags) { | |
8b516fde | 117 | const char *key, *value; |
309f631d | 118 | struct udev_list_entry *e; |
2001208c | 119 | |
8b516fde | 120 | if (!hwdb || !modalias) { |
2001208c KS |
121 | errno = EINVAL; |
122 | return NULL; | |
123 | } | |
124 | ||
9485d98d | 125 | udev_list_cleanup(&hwdb->properties_list); |
8b516fde | 126 | |
0b931571 | 127 | SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value) { |
8b516fde TG |
128 | if (udev_list_entry_add(&hwdb->properties_list, key, value) == NULL) { |
129 | errno = ENOMEM; | |
130 | return NULL; | |
131 | } | |
2001208c | 132 | } |
8b516fde | 133 | |
309f631d LP |
134 | e = udev_list_get_entry(&hwdb->properties_list); |
135 | if (!e) | |
136 | errno = ENODATA; | |
137 | ||
138 | return e; | |
2001208c | 139 | } |