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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Temperature sensor module for Chrome EC */
#ifndef __CROS_EC_TEMP_SENSOR_H
#define __CROS_EC_TEMP_SENSOR_H
#include "common.h"
#include "board.h"
#define TEMP_SENSOR_POWER_NONE 0x0
#define TEMP_SENSOR_POWER_VS 0x1
#define TEMP_SENSOR_POWER_CPU 0x2
/* "enum temp_sensor_id" must be defined for each board in board.h. */
enum temp_sensor_id;
/* Type of temperature sensors. */
enum temp_sensor_type {
/* Ignore this temperature sensor. */
TEMP_SENSOR_TYPE_IGNORED = -1,
/* CPU temperature sensors. */
TEMP_SENSOR_TYPE_CPU = 0,
/* Other on-board temperature sensors. */
TEMP_SENSOR_TYPE_BOARD,
/* Case temperature sensors. */
TEMP_SENSOR_TYPE_CASE,
TEMP_SENSOR_TYPE_COUNT
};
struct temp_sensor_t {
const char* name;
/* Flags indicating power needed by temp sensor. */
int8_t power_flags;
/* Temperature sensor type. */
enum temp_sensor_type type;
/* Read sensor value and return temperature in K. */
int (*read)(int idx);
/* Index among the same kind of sensors. */
int idx;
/* Delay between reading temperature and taking action about it,
* in seconds. */
int action_delay_sec;
};
/* Return the most recently measured temperature for the sensor in K,
* or -1 if error. */
int temp_sensor_read(enum temp_sensor_id id);
/* Return non-zero if sensor is powered. */
int temp_sensor_powered(enum temp_sensor_id id);
#endif /* __CROS_EC_TEMP_SENSOR_H */
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