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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 */
#include "adc.h"
#include "common.h"
#include "hooks.h"
#include "lm4_adc.h"
/* Initialize temperature reading to a sane value (27 C) */
static int last_val = 300;
static void chip_temp_sensor_poll(void)
{
last_val = adc_read_channel(ADC_CH_EC_TEMP);
}
DECLARE_HOOK(HOOK_SECOND, chip_temp_sensor_poll, HOOK_PRIO_DEFAULT);
int chip_temp_sensor_get_val(int idx, int *temp_ptr)
{
if (last_val == ADC_READ_ERROR)
return EC_ERROR_UNKNOWN;
*temp_ptr = last_val;
return EC_SUCCESS;
}
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