sys/dev/drm/linux_dmi.c

   1 /*
   2  * Copyright (c) 2019 François Tigeot <ftigeot@wolfpond.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <linux/types.h>
  28 #include <linux/string.h>
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/ctype.h>
  32 #include <linux/dmi.h>
  33 #include <asm/unaligned.h>
  34
  35 bool
  36 dmi_match(enum dmi_field f, const char *str)
  37 {
  38         const char *s = NULL;
  39
  40         switch (f) {
  41         case DMI_NONE:
  42                 break;
  43         case DMI_SYS_VENDOR:
  44                 s = kgetenv("smbios.system.maker");
  45                 if (s != NULL && !strcmp(s, str))
  46                         return true;
  47                 break;
  48         case DMI_BOARD_VENDOR:
  49                 s = kgetenv("smbios.planar.maker");
  50                 if (s != NULL && !strcmp(s, str))
  51                         return true;
  52                 break;
  53         case DMI_PRODUCT_NAME:
  54                 s = kgetenv("smbios.system.product");
  55                 if (s != NULL && !strcmp(s, str))
  56                         return true;
  57                 break;
  58         case DMI_BOARD_NAME:
  59                 s = kgetenv("smbios.planar.product");
  60                 if (s != NULL && !strcmp(s, str))
  61                         return true;
  62                 break;
  63         default:
  64                 return false;
  65         }
  66
  67         return false;
  68 }