summaryrefslogtreecommitdiff
path: root/include/linux/hwmon-vid.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/hwmon-vid.h')
-rw-r--r--include/linux/hwmon-vid.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/hwmon-vid.h b/include/linux/hwmon-vid.h
new file mode 100644
index 000000000000..cd4b7a042b86
--- /dev/null
+++ b/include/linux/hwmon-vid.h
@@ -0,0 +1,45 @@
+/*
+ hwmon-vid.h - VID/VRM/VRD voltage conversions
+
+ Originally part of lm_sensors
+ Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ With assistance from Trent Piepho <xyzzy@speakeasy.org>
+
+ 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
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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.
+*/
+
+#ifndef _LINUX_HWMON_VID_H
+#define _LINUX_HWMON_VID_H
+
+int vid_from_reg(int val, int vrm);
+int 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, int 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);
+ default:
+ return -1;
+ }
+}
+
+#endif /* _LINUX_HWMON_VID_H */