hwmon-vid.h 1.5 KB

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  1. /*
  2. hwmon-vid.h - VID/VRM/VRD voltage conversions
  3. Originally part of lm_sensors
  4. Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
  5. With assistance from Trent Piepho <xyzzy@speakeasy.org>
  6. This program is free software; you can redistribute it and/or modify
  7. it under the terms of the GNU General Public License as published by
  8. the Free Software Foundation; either version 2 of the License, or
  9. (at your option) any later version.
  10. This program is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13. GNU General Public License for more details.
  14. You should have received a copy of the GNU General Public License
  15. along with this program; if not, write to the Free Software
  16. Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17. */
  18. #ifndef _LINUX_HWMON_VID_H
  19. #define _LINUX_HWMON_VID_H
  20. int vid_from_reg(int val, u8 vrm);
  21. u8 vid_which_vrm(void);
  22. /* vrm is the VRM/VRD document version multiplied by 10.
  23. val is in mV to avoid floating point in the kernel.
  24. Returned value is the 4-, 5- or 6-bit VID code.
  25. Note that only VRM 9.x is supported for now. */
  26. static inline int vid_to_reg(int val, u8 vrm)
  27. {
  28. switch (vrm) {
  29. case 91: /* VRM 9.1 */
  30. case 90: /* VRM 9.0 */
  31. return ((val >= 1100) && (val <= 1850) ?
  32. ((18499 - val * 10) / 25 + 5) / 10 : -1);
  33. default:
  34. return -1;
  35. }
  36. }
  37. #endif /* _LINUX_HWMON_VID_H */