include/linux/hwmon-vid.h

   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
  26 int vid_from_reg(int val, u8 vrm);
  27 u8 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. */
  33 static 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 */