blob: da0a680e2f6d759d44c3e6e770e60db1dd8b8bc6 [file] [log] [blame]
hwmon-vid.h - VID/VRM/VRD voltage conversions
Originally part of lm_sensors
Copyright (c) 2002 Mark D. Studebaker <>
With assistance from Trent Piepho <>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
int vid_from_reg(int val, u8 vrm);
u8 vid_which_vrm(void);
/* vrm is the VRM/VRD document version multiplied by 10.
val is in mV to avoid floating point in the kernel.
Returned value is the 4-, 5- or 6-bit VID code.
Note that only VRM 9.x is supported for now. */
static inline int vid_to_reg(int val, u8 vrm)
switch (vrm) {
case 91: /* VRM 9.1 */
case 90: /* VRM 9.0 */
return ((val >= 1100) && (val <= 1850) ?
((18499 - val * 10) / 25 + 5) / 10 : -1);
return -EINVAL;
#endif /* _LINUX_HWMON_VID_H */