linux/include/linux/hwmon-vid.h
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   1/*
   2    hwmon-vid.h - VID/VRM/VRD voltage conversions
   3
   4    Originally part of lm_sensors
   5    Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
   6    With assistance from Trent Piepho <xyzzy@speakeasy.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21*/
  22
  23#ifndef _LINUX_HWMON_VID_H
  24#define _LINUX_HWMON_VID_H
  25
  26int vid_from_reg(int val, u8 vrm);
  27u8 vid_which_vrm(void);
  28
  29/* vrm is the VRM/VRD document version multiplied by 10.
  30   val is in mV to avoid floating point in the kernel.
  31   Returned value is the 4-, 5- or 6-bit VID code.
  32   Note that only VRM 9.x is supported for now. */
  33static inline int vid_to_reg(int val, u8 vrm)
  34{
  35        switch (vrm) {
  36        case 91:                /* VRM 9.1 */
  37        case 90:                /* VRM 9.0 */
  38                return ((val >= 1100) && (val <= 1850) ?
  39                        ((18499 - val * 10) / 25 + 5) / 10 : -1);
  40        default:
  41                return -1;
  42        }
  43}
  44
  45#endif /* _LINUX_HWMON_VID_H */
  46
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