util-linux/lsusb.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * lsusb implementation for busybox
   4  *
   5  * Copyright (C) 2009  Malek Degachi <malek-degachi@laposte.net>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 //config:config LSUSB
  10 //config:       bool "lsusb (4.2 kb)"
  11 //config:       default y
  12 //config:       #select PLATFORM_LINUX
  13 //config:       help
  14 //config:       lsusb is a utility for displaying information about USB buses in the
  15 //config:       system and devices connected to them.
  16 //config:
  17 //config:       This version uses sysfs (/sys/bus/usb/devices) only.
  18
  19 //applet:IF_LSUSB(APPLET_NOEXEC(lsusb, lsusb, BB_DIR_USR_BIN, BB_SUID_DROP, lsusb))
  20
  21 //kbuild:lib-$(CONFIG_LSUSB) += lsusb.o
  22
  23 //usage:#define lsusb_trivial_usage NOUSAGE_STR
  24 //usage:#define lsusb_full_usage ""
  25
  26 #include "libbb.h"
  27
  28 static int FAST_FUNC fileAction(
  29                 const char *fileName,
  30                 struct stat *statbuf UNUSED_PARAM,
  31                 void *userData UNUSED_PARAM,
  32                 int depth UNUSED_PARAM)
  33 {
  34         parser_t *parser;
  35         char *tokens[4];
  36         char *busnum = NULL, *devnum = NULL;
  37         int product_vid = 0, product_did = 0;
  38         char *uevent_filename = concat_path_file(fileName, "/uevent");
  39
  40         parser = config_open2(uevent_filename, fopen_for_read);
  41         free(uevent_filename);
  42
  43         while (config_read(parser, tokens, 4, 2, "\\/=", PARSE_NORMAL)) {
  44                 if ((parser->lineno == 1) && strcmp(tokens[0], "DEVTYPE") == 0) {
  45                         break;
  46                 }
  47
  48                 if (strcmp(tokens[0], "PRODUCT") == 0) {
  49                         product_vid = xstrtou(tokens[1], 16);
  50                         product_did = xstrtou(tokens[2], 16);
  51                         continue;
  52                 }
  53
  54                 if (strcmp(tokens[0], "BUSNUM") == 0) {
  55                         busnum = xstrdup(tokens[1]);
  56                         continue;
  57                 }
  58
  59                 if (strcmp(tokens[0], "DEVNUM") == 0) {
  60                         devnum = xstrdup(tokens[1]);
  61                         continue;
  62                 }
  63         }
  64         config_close(parser);
  65
  66         if (busnum) {
  67                 printf("Bus %s Device %s: ID %04x:%04x\n", busnum, devnum, product_vid, product_did);
  68                 free(busnum);
  69                 free(devnum);
  70         }
  71
  72         return TRUE;
  73 }
  74
  75 int lsusb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  76 int lsusb_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  77 {
  78         /* no options, no getopt */
  79
  80         recursive_action("/sys/bus/usb/devices",
  81                         ACTION_RECURSE,
  82                         fileAction,
  83                         NULL, /* dirAction */
  84                         NULL, /* userData */
  85                         0 /* depth */);
  86
  87         return EXIT_SUCCESS;
  88 }