1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 hwmon-vid.h - VID/VRM/VRD voltage conversions 4 5 Originally part of lm_sensors 6 Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> 7 With assistance from Trent Piepho <xyzzy@speakeasy.org> 8 9 */ 10 11 #ifndef _LINUX_HWMON_VID_H 12 #define _LINUX_HWMON_VID_H 13 14 int vid_from_reg(int val, u8 vrm); 15 u8 vid_which_vrm(void); 16 17 /* vrm is the VRM/VRD document version multiplied by 10. 18 val is in mV to avoid floating point in the kernel. 19 Returned value is the 4-, 5- or 6-bit VID code. 20 Note that only VRM 9.x is supported for now. */ 21 static inline int vid_to_reg(int val, u8 vrm) 22 { 23 switch (vrm) { 24 case 91: /* VRM 9.1 */ 25 case 90: /* VRM 9.0 */ 26 return ((val >= 1100) && (val <= 1850) ? 27 ((18499 - val * 10) / 25 + 5) / 10 : -1); 28 default: 29 return -EINVAL; 30 } 31 } 32 33 #endif /* _LINUX_HWMON_VID_H */ 34