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/* Copyright 2021 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.
*/
/* PCT2075 temperature sensor module for Chrome EC */
#include "common.h"
#include "console.h"
#include "i2c.h"
#include "hooks.h"
#include "math_util.h"
#include "temp_sensor/pct2075.h"
#include "util.h"
#ifdef CONFIG_ZEPHYR
#include "temp_sensor/temp_sensor.h"
#endif
#define PCT2075_RESOLUTION 11
#define PCT2075_SHIFT1 (16 - PCT2075_RESOLUTION)
#define PCT2075_SHIFT2 (PCT2075_RESOLUTION - 8)
#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)
static int temp_mk_local[PCT2075_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(pct2075_sensors[sensor].i2c_port))
return EC_ERROR_NOT_POWERED;
#endif
return i2c_read16(pct2075_sensors[sensor].i2c_port,
pct2075_sensors[sensor].i2c_addr_flags,
offset, data_ptr);
}
static int get_reg_temp(int sensor, int *temp_ptr)
{
int temp_raw = 0;
RETURN_ERROR(raw_read16(sensor, PCT2075_REG_TEMP, &temp_raw));
*temp_ptr = (int)(int16_t)temp_raw;
return EC_SUCCESS;
}
static inline int pct2075_reg_to_mk(int16_t reg)
{
int temp_mc;
temp_mc = (((reg >> PCT2075_SHIFT1) * 1000) >> PCT2075_SHIFT2);
return MILLI_CELSIUS_TO_MILLI_KELVIN(temp_mc);
}
int pct2075_get_val_k(int idx, int *temp_k_ptr)
{
if (idx >= PCT2075_COUNT)
return EC_ERROR_INVAL;
*temp_k_ptr = MILLI_KELVIN_TO_KELVIN(temp_mk_local[idx]);
return EC_SUCCESS;
}
int pct2075_get_val_mk(int idx, int *temp_mk_ptr)
{
if (idx >= PCT2075_COUNT)
return EC_ERROR_INVAL;
*temp_mk_ptr = temp_mk_local[idx];
return EC_SUCCESS;
}
static void pct2075_poll(void)
{
int s;
int temp_reg = 0;
for (s = 0; s < PCT2075_COUNT; s++) {
if (get_reg_temp(s, &temp_reg) == EC_SUCCESS)
temp_mk_local[s] = pct2075_reg_to_mk(temp_reg);
}
}
DECLARE_HOOK(HOOK_SECOND, pct2075_poll, HOOK_PRIO_TEMP_SENSOR);
void pct2075_init(void)
{
/* Incase we need to initialize somthing */
}
DECLARE_HOOK(HOOK_INIT, pct2075_init, HOOK_PRIO_DEFAULT);
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