2 This file is part of systemd.
4 Copyright 2012 Kay Sievers <kay@vrfy.org>
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
32 #include "hwdb-util.h"
36 int udev_builtin_hwdb_lookup(struct udev_device *dev,
37 const char *prefix, const char *modalias,
38 const char *filter, bool test) {
39 _cleanup_free_ const char *lookup = NULL;
40 const char *key, *value;
47 lookup = strjoin(prefix, modalias, NULL);
53 SD_HWDB_FOREACH_PROPERTY(hwdb, modalias, key, value) {
54 if (filter && fnmatch(filter, key, FNM_NOESCAPE) != 0)
57 if (udev_builtin_add_property(dev, test, key, value) < 0)
64 static const char *modalias_usb(struct udev_device *dev, char *s, size_t size) {
68 v = udev_device_get_sysattr_value(dev, "idVendor");
71 p = udev_device_get_sysattr_value(dev, "idProduct");
74 vn = strtol(v, NULL, 16);
77 pn = strtol(p, NULL, 16);
80 snprintf(s, size, "usb:v%04Xp%04X*", vn, pn);
84 static int udev_builtin_hwdb_search(struct udev_device *dev, struct udev_device *srcdev,
85 const char *subsystem, const char *prefix,
86 const char *filter, bool test) {
87 struct udev_device *d;
92 for (d = srcdev; d && !last; d = udev_device_get_parent(d)) {
94 const char *modalias = NULL;
96 dsubsys = udev_device_get_subsystem(d);
100 /* look only at devices of a specific subsystem */
101 if (subsystem && !streq(dsubsys, subsystem))
104 modalias = udev_device_get_property_value(d, "MODALIAS");
106 if (streq(dsubsys, "usb") && streq_ptr(udev_device_get_devtype(d), "usb_device")) {
107 /* if the usb_device does not have a modalias, compose one */
109 modalias = modalias_usb(d, s, sizeof(s));
111 /* avoid looking at any parent device, they are usually just a USB hub */
118 r = udev_builtin_hwdb_lookup(dev, prefix, modalias, filter, test);
126 static int builtin_hwdb(struct udev_device *dev, int argc, char *argv[], bool test) {
127 static const struct option options[] = {
128 { "filter", required_argument, NULL, 'f' },
129 { "device", required_argument, NULL, 'd' },
130 { "subsystem", required_argument, NULL, 's' },
131 { "lookup-prefix", required_argument, NULL, 'p' },
134 const char *filter = NULL;
135 const char *device = NULL;
136 const char *subsystem = NULL;
137 const char *prefix = NULL;
138 struct udev_device *srcdev;
146 option = getopt_long(argc, argv, "f:d:s:p:", options, NULL);
169 /* query a specific key given as argument */
171 if (udev_builtin_hwdb_lookup(dev, prefix, argv[optind], filter, test) > 0)
176 /* read data from another device than the device we will store the data */
178 srcdev = udev_device_new_from_device_id(udev_device_get_udev(dev), device);
184 if (udev_builtin_hwdb_search(dev, srcdev, subsystem, prefix, filter, test) > 0)
189 /* called at udev startup and reload */
190 static int builtin_hwdb_init(struct udev *udev) {
196 r = sd_hwdb_new(&hwdb);
203 /* called on udev shutdown and reload request */
204 static void builtin_hwdb_exit(struct udev *udev) {
205 hwdb = sd_hwdb_unref(hwdb);
208 /* called every couple of seconds during event activity; 'true' if config has changed */
209 static bool builtin_hwdb_validate(struct udev *udev) {
210 return hwdb_validate(hwdb);
213 const struct udev_builtin udev_builtin_hwdb = {
216 .init = builtin_hwdb_init,
217 .exit = builtin_hwdb_exit,
218 .validate = builtin_hwdb_validate,
219 .help = "Hardware database",