drivers/i2c/i2c-sensor-vid.c

   1 /*
   2     i2c-sensor-vid.c -  Part of lm_sensors, Linux kernel modules for hardware
   3                         monitoring
   4
   5     Copyright (c) 2004 Rudolf Marek <r.marek@sh.cvut.cz>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include <linux/config.h>
  23 #include <linux/module.h>
  24 #include <linux/kernel.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},       /* 0xB 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 i2c_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) return 0;       /* any CPU with familly lower than 6
  74                                         dont have VID and/or CPUID */
  75         eax = cpuid_eax(1);
  76         eff_family = ((eax & 0x00000F00)>>8);
  77         eff_model  = ((eax & 0x000000F0)>>4);
  78         if (eff_family == 0xF) {        /* use extended model & family */
  79                 eff_family += ((eax & 0x00F00000)>>20);
  80                 eff_model += ((eax & 0x000F0000)>>16)<<4;
  81         }
  82         vrm_ret = find_vrm(eff_family,eff_model,c->x86_vendor);
  83         if (vrm_ret == 0)
  84                 printk(KERN_INFO "i2c-sensor.o: Unknown VRM version of your"
  85                 " x86 CPU\n");
  86         return vrm_ret;
  87 }
  88
  89 /* and now for something completely different for Non-x86 world*/
  90 #else
  91 int i2c_which_vrm(void)
  92 {
  93         printk(KERN_INFO "i2c-sensor.o: Unknown VRM version of your CPU\n");
  94         return 0;
  95 }
  96 #endif
  97
  98 EXPORT_SYMBOL(i2c_which_vrm);