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
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