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 -EINVAL; 42 } 43 } 44 45 #endif /* _LINUX_HWMON_VID_H */ 46