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
14int vid_from_reg(int val, u8 vrm);
15u8 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. */
21static 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