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40 lines
1.1 KiB
40 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* lm75.h - Part of lm_sensors, Linux kernel modules for hardware monitoring |
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* Copyright (c) 2003 Mark M. Hoffman <[email protected]> |
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*/ |
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/* |
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* This file contains common code for encoding/decoding LM75 type |
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* temperature readings, which are emulated by many of the chips |
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* we support. As the user is unlikely to load more than one driver |
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* which contains this code, we don't worry about the wasted space. |
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*/ |
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#include <linux/kernel.h> |
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/* straight from the datasheet */ |
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#define LM75_TEMP_MIN (-55000) |
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#define LM75_TEMP_MAX 125000 |
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#define LM75_SHUTDOWN 0x01 |
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/* |
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* TEMP: 0.001C/bit (-55C to +125C) |
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* REG: (0.5C/bit, two's complement) << 7 |
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*/ |
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static inline u16 LM75_TEMP_TO_REG(long temp) |
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{ |
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int ntemp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
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ntemp += (ntemp < 0 ? -250 : 250); |
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return (u16)((ntemp / 500) << 7); |
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} |
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static inline int LM75_TEMP_FROM_REG(u16 reg) |
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{ |
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/* |
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* use integer division instead of equivalent right shift to |
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* guarantee arithmetic shift and preserve the sign |
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*/ |
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return ((s16)reg / 128) * 500; |
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}
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