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/***
This file is part of systemd.
Copyright 2012 Kay Sievers <kay@vrfy.org>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
#include <getopt.h>
#include "udev.h"
static struct udev_hwdb *hwdb;
int udev_builtin_hwdb_lookup(struct udev_device *dev, const char *modalias, bool test) {
struct udev_list_entry *entry;
int n = 0;
if (!hwdb)
return -ENOENT;
udev_list_entry_foreach(entry, udev_hwdb_get_properties_list_entry(hwdb, modalias, 0)) {
if (udev_builtin_add_property(dev, test,
udev_list_entry_get_name(entry),
udev_list_entry_get_value(entry)) < 0)
return -ENOMEM;
n++;
}
return n;
}
static const char *modalias_usb(struct udev_device *dev, char *s, size_t size) {
const char *v, *p;
int vn, pn;
v = udev_device_get_sysattr_value(dev, "idVendor");
if (!v)
return NULL;
p = udev_device_get_sysattr_value(dev, "idProduct");
if (!p)
return NULL;
vn = strtol(v, NULL, 16);
if (vn <= 0)
return NULL;
pn = strtol(p, NULL, 16);
if (pn <= 0)
return NULL;
snprintf(s, size, "usb:v%04Xp%04X*", vn, pn);
return s;
}
static int udev_builtin_hwdb_search(struct udev_device *dev, const char *subsystem, bool test) {
struct udev_device *d;
char s[16];
int n = 0;
for (d = dev; d; d = udev_device_get_parent(d)) {
const char *dsubsys;
const char *modalias = NULL;
dsubsys = udev_device_get_subsystem(d);
if (!dsubsys)
continue;
/* look only at devices of a specific subsystem */
if (subsystem && !streq(dsubsys, subsystem))
continue;
/* the usb_device does not have a modalias, compose one */
if (streq(dsubsys, "usb"))
modalias = modalias_usb(dev, s, sizeof(s));
if (!modalias)
modalias = udev_device_get_property_value(d, "MODALIAS");
if (!modalias)
continue;
n = udev_builtin_hwdb_lookup(dev, modalias, test);
if (n > 0)
break;
}
return n;
}
static int builtin_hwdb(struct udev_device *dev, int argc, char *argv[], bool test) {
static const struct option options[] = {
{ "subsystem", required_argument, NULL, 's' },
{}
};
const char *subsystem = NULL;
if (!hwdb)
return EXIT_FAILURE;
for (;;) {
int option;
option = getopt_long(argc, argv, "s", options, NULL);
if (option == -1)
break;
switch (option) {
case 's':
subsystem = optarg;
break;
}
}
if (udev_builtin_hwdb_search(dev, subsystem, test) < 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
/* called at udev startup and reload */
static int builtin_hwdb_init(struct udev *udev)
{
if (hwdb)
return 0;
hwdb = udev_hwdb_new(udev);
if (!hwdb)
return -ENOMEM;
return 0;
}
/* called on udev shutdown and reload request */
static void builtin_hwdb_exit(struct udev *udev)
{
hwdb = udev_hwdb_unref(hwdb);
}
/* called every couple of seconds during event activity; 'true' if config has changed */
static bool builtin_hwdb_validate(struct udev *udev)
{
return udev_hwdb_validate(hwdb);
}
const struct udev_builtin udev_builtin_hwdb = {
.name = "hwdb",
.cmd = builtin_hwdb,
.init = builtin_hwdb_init,
.exit = builtin_hwdb_exit,
.validate = builtin_hwdb_validate,
.help = "hardware database",
};
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