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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | i2c-vid.h - Part of lm_sensors, Linux kernel modules for hardware |
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| 3 | monitoring |
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| 4 | Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> |
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| 5 | With assistance from Trent Piepho <xyzzy@speakeasy.org> |
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| 6 | |||
| 7 | This program is free software; you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation; either version 2 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |||
| 12 | This program is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |||
| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with this program; if not, write to the Free Software |
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| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 20 | */ |
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| 21 | |||
| 22 | /* |
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| 23 | This file contains common code for decoding VID pins. |
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| 24 | This file is #included in various chip drivers in this directory. |
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| 25 | As the user is unlikely to load more than one driver which |
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| 26 | includes this code we don't worry about the wasted space. |
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| 27 | Reference: VRM x.y DC-DC Converter Design Guidelines, |
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| 28 | available at http://developer.intel.com |
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| 29 | */ |
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| 30 | |||
| 31 | /* |
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| 32 | Legal val values 00 - 1F. |
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| 33 | vrm is the Intel VRM document version. |
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| 34 | Note: vrm version is scaled by 10 and the return value is scaled by 1000 |
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| 35 | to avoid floating point in the kernel. |
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| 36 | */ |
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| 37 | |||
| 38 | #define DEFAULT_VRM 82 |
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| 39 | |||
| 40 | static inline int vid_from_reg(int val, int vrm) |
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| 41 | { |
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| 42 | switch(vrm) { |
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| 43 | |||
| 44 | case 91: /* VRM 9.1 */ |
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| 45 | case 90: /* VRM 9.0 */ |
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| 46 | return(val == 0x1f ? 0 : |
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| 47 | 1850 - val * 25); |
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| 48 | |||
| 49 | case 85: /* VRM 8.5 */ |
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| 50 | return((val & 0x10 ? 25 : 0) + |
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| 51 | ((val & 0x0f) > 0x04 ? 2050 : 1250) - |
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| 52 | ((val & 0x0f) * 50)); |
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| 53 | |||
| 54 | case 84: /* VRM 8.4 */ |
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| 55 | val &= 0x0f; |
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| 56 | /* fall through */ |
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| 57 | default: /* VRM 8.2 */ |
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| 58 | return(val == 0x1f ? 0 : |
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| 59 | val & 0x10 ? 5100 - (val) * 100 : |
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| 60 | 2050 - (val) * 50); |
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| 61 | } |
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| 62 | } |