util-linux/lspci.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * lspci 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 LSPCI
  10 //config:       bool "lspci (6.3 kb)"
  11 //config:       default y
  12 //config:       #select PLATFORM_LINUX
  13 //config:       help
  14 //config:       lspci is a utility for displaying information about PCI buses in the
  15 //config:       system and devices connected to them.
  16 //config:
  17 //config:       This version uses sysfs (/sys/bus/pci/devices) only.
  18
  19 //applet:IF_LSPCI(APPLET_NOEXEC(lspci, lspci, BB_DIR_USR_BIN, BB_SUID_DROP, lspci))
  20
  21 //kbuild:lib-$(CONFIG_LSPCI) += lspci.o
  22
  23 //usage:#define lspci_trivial_usage
  24 //usage:       "[-mk]"
  25 //usage:#define lspci_full_usage "\n\n"
  26 //usage:       "List all PCI devices"
  27 //usage:     "\n"
  28 //usage:     "\n        -m      Parsable output"
  29 //usage:     "\n        -k      Show driver"
  30
  31 #include "libbb.h"
  32
  33 enum {
  34         OPT_m = (1 << 0),
  35         OPT_k = (1 << 1),
  36 };
  37
  38 /*
  39  * PCI_SLOT_NAME PCI_CLASS: PCI_VID:PCI_DID [PCI_SUBSYS_VID:PCI_SUBSYS_DID] [DRIVER]
  40  */
  41 static int FAST_FUNC fileAction(
  42                 const char *fileName,
  43                 struct stat *statbuf UNUSED_PARAM,
  44                 void *userData UNUSED_PARAM,
  45                 int depth UNUSED_PARAM)
  46 {
  47         parser_t *parser;
  48         char *tokens[3];
  49         char *pci_slot_name = NULL, *driver = NULL;
  50         int pci_class = 0, pci_vid = 0, pci_did = 0;
  51         int pci_subsys_vid = 0, pci_subsys_did = 0;
  52
  53         char *uevent_filename = concat_path_file(fileName, "/uevent");
  54         parser = config_open2(uevent_filename, fopen_for_read);
  55         free(uevent_filename);
  56
  57         while (config_read(parser, tokens, 3, 2, "\0:=", PARSE_NORMAL)) {
  58                 if (strcmp(tokens[0], "DRIVER") == 0) {
  59                         driver = xstrdup(tokens[1]);
  60                         continue;
  61                 }
  62
  63                 if (strcmp(tokens[0], "PCI_CLASS") == 0) {
  64                         pci_class = xstrtou(tokens[1], 16)>>8;
  65                         continue;
  66                 }
  67
  68                 if (strcmp(tokens[0], "PCI_ID") == 0) {
  69                         pci_vid = xstrtou(tokens[1], 16);
  70                         pci_did = xstrtou(tokens[2], 16);
  71                         continue;
  72                 }
  73
  74                 if (strcmp(tokens[0], "PCI_SUBSYS_ID") == 0) {
  75                         pci_subsys_vid = xstrtou(tokens[1], 16);
  76                         pci_subsys_did = xstrtou(tokens[2], 16);
  77                         continue;
  78                 }
  79
  80                 if (strcmp(tokens[0], "PCI_SLOT_NAME") == 0) {
  81                         pci_slot_name = xstrdup(tokens[2]);
  82                         continue;
  83                 }
  84         }
  85         config_close(parser);
  86
  87
  88         if (option_mask32 & OPT_m) {
  89                 printf("%s \"Class %04x\" \"%04x\" \"%04x\" \"%04x\" \"%04x\"",
  90                         pci_slot_name, pci_class, pci_vid, pci_did,
  91                         pci_subsys_vid, pci_subsys_did);
  92         } else {
  93                 printf("%s Class %04x: %04x:%04x",
  94                         pci_slot_name, pci_class, pci_vid, pci_did);
  95         }
  96
  97         if ((option_mask32 & OPT_k) && driver) {
  98                 if (option_mask32 & OPT_m) {
  99                         printf(" \"%s\"", driver);
 100                 } else {
 101                         printf(" %s", driver);
 102                 }
 103         }
 104         bb_putchar('\n');
 105
 106         free(driver);
 107         free(pci_slot_name);
 108
 109         return TRUE;
 110 }
 111
 112 int lspci_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 113 int lspci_main(int argc UNUSED_PARAM, char **argv)
 114 {
 115         getopt32(argv, "m" /*non-compat:*/ "k" /*ignored:*/ "nv");
 116
 117         recursive_action("/sys/bus/pci/devices",
 118                         ACTION_RECURSE,
 119                         fileAction,
 120                         NULL, /* dirAction */
 121                         NULL, /* userData */
 122                         0 /* depth */);
 123
 124         return EXIT_SUCCESS;
 125 }