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/* Copyright 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 "math_util.h"
#include "util.h"
#define TMP112_RESOLUTION 12
#define TMP112_SHIFT1 (16 - TMP112_RESOLUTION)
#define TMP112_SHIFT2 (TMP112_RESOLUTION - 8)
#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)
static int temp_mk_local[TMP112_COUNT];
static int raw_read16(int sensor, const int offset, int *data_ptr)
{
#ifdef CONFIG_I2C_BUS_MAY_BE_UNPOWERED
/*
* Don't try to read if the port is unpowered
*/
if (!board_is_i2c_port_powered(tmp112_sensors[sensor].i2c_port))
return EC_ERROR_NOT_POWERED;
#endif
return i2c_read16(tmp112_sensors[sensor].i2c_port,
tmp112_sensors[sensor].i2c_addr_flags,
offset, data_ptr);
}
static int raw_write16(int sensor, const int offset, int data)
{
#ifdef CONFIG_I2C_BUS_MAY_BE_UNPOWERED
/*
* Don't try to write if the port is unpowered
*/
if (!board_is_i2c_port_powered(tmp112_sensors[sensor].i2c_port))
return EC_ERROR_NOT_POWERED;
#endif
return i2c_write16(tmp112_sensors[sensor].i2c_port,
tmp112_sensors[sensor].i2c_addr_flags,
offset, data);
}
static int get_reg_temp(int sensor, int *temp_ptr)
{
int rv;
int temp_raw = 0;
rv = raw_read16(sensor, TMP112_REG_TEMP, &temp_raw);
if (rv)
return rv;
*temp_ptr = (int)(int16_t)temp_raw;
return EC_SUCCESS;
}
static inline int tmp112_reg_to_mk(int16_t reg)
{
int temp_mc;
temp_mc = (((reg >> TMP112_SHIFT1) * 1000) >> TMP112_SHIFT2);
return MILLI_CELSIUS_TO_MILLI_KELVIN(temp_mc);
}
int tmp112_get_val_k(int idx, int *temp_k_ptr)
{
if (idx >= TMP112_COUNT)
return EC_ERROR_INVAL;
*temp_k_ptr = MILLI_KELVIN_TO_KELVIN(temp_mk_local[idx]);
return EC_SUCCESS;
}
int tmp112_get_val_mk(int idx, int *temp_mk_ptr)
{
if (idx >= TMP112_COUNT)
return EC_ERROR_INVAL;
*temp_mk_ptr = temp_mk_local[idx];
return EC_SUCCESS;
}
static void tmp112_poll(void)
{
int s;
int temp_reg = 0;
for (s = 0; s < TMP112_COUNT; s++) {
if (get_reg_temp(s, &temp_reg) == EC_SUCCESS)
temp_mk_local[s] = tmp112_reg_to_mk(temp_reg);
}
}
DECLARE_HOOK(HOOK_SECOND, tmp112_poll, HOOK_PRIO_TEMP_SENSOR);
void tmp112_init(void)
{
int tmp, s, rv;
int set_mask, clr_mask;
/* 12 bit mode */
set_mask = (3 << 5);
/* not oneshot mode */
clr_mask = BIT(7);
for (s = 0; s < TMP112_COUNT; s++) {
rv = raw_read16(s, TMP112_REG_CONF, &tmp);
if (rv != EC_SUCCESS) {
CPRINTS("TMP112-%d: Failed to init (rv %d)", s, rv);
continue;
}
raw_write16(s, TMP112_REG_CONF, (tmp & ~clr_mask) | set_mask);
}
}
DECLARE_HOOK(HOOK_INIT, tmp112_init, HOOK_PRIO_DEFAULT);
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