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/* Copyright (c) 2016 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.
*/
/* TMP112 temperature sensor module for Chrome EC */
#include "common.h"
#include "console.h"
#include "tmp112.h"
#include "i2c.h"
#include "hooks.h"
#include "util.h"
#define TMP112_RESOLUTION 12
#define TMP112_SHIFT1 (16 - TMP112_RESOLUTION)
#define TMP112_SHIFT2 (TMP112_RESOLUTION - 8)
static int temp_val_local;
static int raw_read16(const int offset, int *data_ptr)
{
return i2c_read16__7bf(I2C_PORT_THERMAL, TMP112_I2C_ADDR__7bf,
offset, data_ptr);
}
static int raw_write16(const int offset, int data)
{
return i2c_write16__7bf(I2C_PORT_THERMAL, TMP112_I2C_ADDR__7bf,
offset, data);
}
static int get_temp(int *temp_ptr)
{
int rv;
int temp_raw = 0;
rv = raw_read16(TMP112_REG_TEMP, &temp_raw);
if (rv < 0)
return rv;
*temp_ptr = (int)(int16_t)temp_raw;
return EC_SUCCESS;
}
static inline int tmp112_reg_to_c(int16_t reg)
{
int tmp;
tmp = (((reg >> TMP112_SHIFT1) * 1000 ) >> TMP112_SHIFT2);
return tmp / 1000;
}
int tmp112_get_val(int idx, int *temp_ptr)
{
*temp_ptr = temp_val_local;
return EC_SUCCESS;
}
static void tmp112_poll(void)
{
int temp_c = 0;
if (get_temp(&temp_c) == EC_SUCCESS)
temp_val_local = C_TO_K(tmp112_reg_to_c(temp_c));
}
DECLARE_HOOK(HOOK_SECOND, tmp112_poll, HOOK_PRIO_TEMP_SENSOR);
static void tmp112_init(void)
{
int tmp;
int set_mask, clr_mask;
/* 12 bit mode */
set_mask = (3 << 5);
/* not oneshot mode */
clr_mask = (1 << 7);
raw_read16(TMP112_REG_CONF, &tmp);
raw_write16(TMP112_REG_CONF, (tmp & ~clr_mask) | set_mask);
}
DECLARE_HOOK(HOOK_INIT, tmp112_init, HOOK_PRIO_DEFAULT);
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