Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * lm75.h - Part of lm_sensors, Linux kernel modules for hardware monitoring
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (c) 2003 Mark M. Hoffman <mhoffman@lightlink.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * This file contains common code for encoding/decoding LM75 type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * temperature readings, which are emulated by many of the chips
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * we support.  As the user is unlikely to load more than one driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * which contains this code, we don't worry about the wasted space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* straight from the datasheet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define LM75_TEMP_MIN (-55000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define LM75_TEMP_MAX 125000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define LM75_SHUTDOWN 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * TEMP: 0.001C/bit (-55C to +125C)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * REG: (0.5C/bit, two's complement) << 7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline u16 LM75_TEMP_TO_REG(long temp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	int ntemp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	ntemp += (ntemp < 0 ? -250 : 250);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	return (u16)((ntemp / 500) << 7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static inline int LM75_TEMP_FROM_REG(u16 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	 * use integer division instead of equivalent right shift to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	 * guarantee arithmetic shift and preserve the sign
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	return ((s16)reg / 128) * 500;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }