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
26int vid_from_reg(int val, u8 vrm);
27u8 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. */
33static 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