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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2001208c | 2 | |
5ea78a39 YW |
3 | #include <errno.h> |
4 | ||
8b516fde | 5 | #include "sd-hwdb.h" |
07630cea | 6 | |
b5efdb8a | 7 | #include "alloc-util.h" |
8b516fde | 8 | #include "hwdb-util.h" |
5ea78a39 | 9 | #include "libudev-list-internal.h" |
2001208c KS |
10 | |
11 | /** | |
12 | * SECTION:libudev-hwdb | |
13 | * @short_description: retrieve properties from the hardware database | |
14 | * | |
f2d433e1 | 15 | * Libudev hardware database interface. |
2001208c KS |
16 | */ |
17 | ||
18 | /** | |
19 | * udev_hwdb: | |
20 | * | |
21 | * Opaque object representing the hardware database. | |
22 | */ | |
23 | struct udev_hwdb { | |
3c6ac219 | 24 | unsigned n_ref; |
8b516fde | 25 | sd_hwdb *hwdb; |
2001208c KS |
26 | struct udev_list properties_list; |
27 | }; | |
28 | ||
2001208c KS |
29 | /** |
30 | * udev_hwdb_new: | |
b485aa58 | 31 | * @udev: udev library context (unused) |
2001208c KS |
32 | * |
33 | * Create a hardware database context to query properties for devices. | |
34 | * | |
35 | * Returns: a hwdb context. | |
36 | **/ | |
37 | _public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) { | |
4afd3348 | 38 | _cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb_internal = NULL; |
2001208c | 39 | struct udev_hwdb *hwdb; |
8b516fde | 40 | int r; |
2001208c | 41 | |
8b516fde | 42 | r = sd_hwdb_new(&hwdb_internal); |
309f631d LP |
43 | if (r < 0) { |
44 | errno = -r; | |
2001208c | 45 | return NULL; |
309f631d | 46 | } |
2001208c | 47 | |
68b80b85 | 48 | hwdb = new(struct udev_hwdb, 1); |
309f631d LP |
49 | if (!hwdb) { |
50 | errno = ENOMEM; | |
2001208c | 51 | return NULL; |
309f631d | 52 | } |
2001208c | 53 | |
68b80b85 YW |
54 | *hwdb = (struct udev_hwdb) { |
55 | .n_ref = 1, | |
56 | .hwdb = TAKE_PTR(hwdb_internal), | |
57 | }; | |
2001208c | 58 | |
8b516fde | 59 | udev_list_init(udev, &hwdb->properties_list, true); |
2001208c | 60 | |
2001208c KS |
61 | return hwdb; |
62 | } | |
63 | ||
3c6ac219 YW |
64 | static struct udev_hwdb *udev_hwdb_free(struct udev_hwdb *hwdb) { |
65 | assert(hwdb); | |
66 | ||
67 | sd_hwdb_unref(hwdb->hwdb); | |
68 | udev_list_cleanup(&hwdb->properties_list); | |
69 | return mfree(hwdb); | |
70 | } | |
71 | ||
2001208c KS |
72 | /** |
73 | * udev_hwdb_ref: | |
74 | * @hwdb: context | |
75 | * | |
76 | * Take a reference of a hwdb context. | |
77 | * | |
78 | * Returns: the passed enumeration context | |
79 | **/ | |
2001208c KS |
80 | |
81 | /** | |
82 | * udev_hwdb_unref: | |
83 | * @hwdb: context | |
84 | * | |
85 | * Drop a reference of a hwdb context. If the refcount reaches zero, | |
86 | * all resources of the hwdb context will be released. | |
87 | * | |
725d7e6c | 88 | * Returns: #NULL |
2001208c | 89 | **/ |
3c6ac219 | 90 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(struct udev_hwdb, udev_hwdb, udev_hwdb_free); |
2001208c | 91 | |
2001208c KS |
92 | /** |
93 | * udev_hwdb_get_properties_list_entry: | |
94 | * @hwdb: context | |
95 | * @modalias: modalias string | |
96 | * @flags: (unused) | |
97 | * | |
98 | * Lookup a matching device in the hardware database. The lookup key is a | |
99 | * modalias string, whose formats are defined for the Linux kernel modules. | |
100 | * Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry | |
101 | * of a list of retrieved properties is returned. | |
102 | * | |
103 | * Returns: a udev_list_entry. | |
104 | */ | |
14cb109d | 105 | _public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned flags) { |
8b516fde | 106 | const char *key, *value; |
309f631d | 107 | struct udev_list_entry *e; |
2001208c | 108 | |
2b19953a YW |
109 | assert_return_errno(hwdb, NULL, EINVAL); |
110 | assert_return_errno(modalias, NULL, EINVAL); | |
2001208c | 111 | |
9485d98d | 112 | udev_list_cleanup(&hwdb->properties_list); |
8b516fde | 113 | |
0b931571 | 114 | SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value) { |
f921b457 | 115 | if (!udev_list_entry_add(&hwdb->properties_list, key, value)) { |
8b516fde TG |
116 | errno = ENOMEM; |
117 | return NULL; | |
118 | } | |
2001208c | 119 | } |
8b516fde | 120 | |
309f631d LP |
121 | e = udev_list_get_entry(&hwdb->properties_list); |
122 | if (!e) | |
123 | errno = ENODATA; | |
124 | ||
125 | return e; | |
2001208c | 126 | } |