drivers/hwmon/hwmon-vid.c

   1 /*
   2     hwmon-vid.c - VID/VRM/VRD voltage conversions
   3
   4     Copyright (c) 2004 Rudolf Marek <r.marek@sh.cvut.cz>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/hwmon-vid.h>
  25
  26 struct vrm_model {
  27         u8 vendor;
  28         u8 eff_family;
  29         u8 eff_model;
  30         int vrm_type;
  31 };
  32
  33 #define ANY 0xFF
  34
  35 #ifdef CONFIG_X86
  36
  37 static struct vrm_model vrm_models[] = {
  38         {X86_VENDOR_AMD, 0x6, ANY, 90},         /* Athlon Duron etc */
  39         {X86_VENDOR_AMD, 0xF, ANY, 24},         /* Athlon 64, Opteron */
  40         {X86_VENDOR_INTEL, 0x6, 0x9, 85},       /* 0.13um too */
  41         {X86_VENDOR_INTEL, 0x6, 0xB, 85},       /* Tualatin */
  42         {X86_VENDOR_INTEL, 0x6, ANY, 82},       /* any P6 */
  43         {X86_VENDOR_INTEL, 0x7, ANY, 0},        /* Itanium */
  44         {X86_VENDOR_INTEL, 0xF, 0x3, 100},      /* P4 Prescott */
  45         {X86_VENDOR_INTEL, 0xF, ANY, 90},       /* P4 before Prescott */
  46         {X86_VENDOR_INTEL, 0x10,ANY, 0},        /* Itanium 2 */
  47         {X86_VENDOR_UNKNOWN, ANY, ANY, 0}       /* stop here */
  48 };
  49
  50 static int find_vrm(u8 eff_family, u8 eff_model, u8 vendor)
  51 {
  52         int i = 0;
  53
  54         while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) {
  55                 if (vrm_models[i].vendor==vendor)
  56                         if ((vrm_models[i].eff_family==eff_family)
  57                          && ((vrm_models[i].eff_model==eff_model) ||
  58                              (vrm_models[i].eff_model==ANY)))
  59                                 return vrm_models[i].vrm_type;
  60                 i++;
  61         }
  62
  63         return 0;
  64 }
  65
  66 int vid_which_vrm(void)
  67 {
  68         struct cpuinfo_x86 *c = cpu_data;
  69         u32 eax;
  70         u8 eff_family, eff_model;
  71         int vrm_ret;
  72
  73         if (c->x86 < 6)         /* Any CPU with family lower than 6 */
  74                 return 0;       /* doesn't have VID and/or CPUID */
  75
  76         eax = cpuid_eax(1);
  77         eff_family = ((eax & 0x00000F00)>>8);
  78         eff_model  = ((eax & 0x000000F0)>>4);
  79         if (eff_family == 0xF) {        /* use extended model & family */
  80                 eff_family += ((eax & 0x00F00000)>>20);
  81                 eff_model += ((eax & 0x000F0000)>>16)<<4;
  82         }
  83         vrm_ret = find_vrm(eff_family,eff_model,c->x86_vendor);
  84         if (vrm_ret == 0)
  85                 printk(KERN_INFO "hwmon-vid: Unknown VRM version of your "
  86                        "x86 CPU\n");
  87         return vrm_ret;
  88 }
  89
  90 /* and now something completely different for the non-x86 world */
  91 #else
  92 int vid_which_vrm(void)
  93 {
  94         printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n");
  95         return 0;
  96 }
  97 #endif
  98
  99 EXPORT_SYMBOL(vid_which_vrm);
 100
 101 MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");
 102
 103 MODULE_DESCRIPTION("hwmon-vid driver");
 104 MODULE_LICENSE("GPL");