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 | |