man/hwdb-usb-device.c

   1 /* SPDX-License-Identifier: MIT-0 */
   2
   3 #define _GNU_SOURCE 1
   4 #include <stdio.h>
   5 #include <stdint.h>
   6 #include <systemd/sd-hwdb.h>
   7
   8 int print_usb_properties(uint16_t vid, uint16_t pid) {
   9   char match[128];
  10   sd_hwdb *hwdb;
  11   const char *key, *value;
  12   int r;
  13
  14   /* Match this USB vendor and product ID combination */
  15   snprintf(match, sizeof match, "usb:v%04Xp%04X", vid, pid);
  16
  17   r = sd_hwdb_new(&hwdb);
  18   if (r < 0)
  19     return r;
  20
  21   SD_HWDB_FOREACH_PROPERTY(hwdb, match, key, value)
  22     printf("%s: \"%s\" → \"%s\"\n", match, key, value);
  23
  24   sd_hwdb_unref(hwdb);
  25   return 0;
  26 }
  27
  28 int main(int argc, char **argv) {
  29   print_usb_properties(0x046D, 0xC534);
  30   return 0;
  31 }