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/* Copyright 2018 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* TMP468 temperature sensor module for Chrome EC */
#include "common.h"
#include "console.h"
#include "tmp432.h"
#include "gpio.h"
#include "i2c.h"
#include "hooks.h"
#include "util.h"
#include "tmp468.h"
static int fake_temp[TMP468_CHANNEL_COUNT] = { -1, -1, -1, -1, -1,
-1, -1, -1, -1 };
static int temp_val[TMP468_CHANNEL_COUNT] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static uint8_t is_sensor_shutdown;
static int has_power(void)
{
return !is_sensor_shutdown;
}
static int raw_read16(const int offset, int *data_ptr)
{
return i2c_read16(I2C_PORT_THERMAL, TMP468_I2C_ADDR_FLAGS, offset,
data_ptr);
}
static int raw_write16(const int offset, int data_ptr)
{
return i2c_write16(I2C_PORT_THERMAL, TMP468_I2C_ADDR_FLAGS, offset,
data_ptr);
}
static int tmp468_shutdown(uint8_t want_shutdown)
{
int ret, value;
if (want_shutdown == is_sensor_shutdown)
return EC_SUCCESS;
ret = raw_read16(TMP468_CONFIGURATION, &value);
if (ret < 0) {
ccprintf("ERROR: Temp sensor I2C read16 error.\n");
return ret;
}
if (want_shutdown)
value |= TMP468_SHUTDOWN;
else
value &= ~TMP468_SHUTDOWN;
ret = raw_write16(TMP468_CONFIGURATION, value);
if (ret == EC_SUCCESS)
is_sensor_shutdown = want_shutdown;
return EC_SUCCESS;
}
int tmp468_get_val(int idx, int *temp_ptr)
{
if (!has_power())
return EC_ERROR_NOT_POWERED;
if (idx < TMP468_CHANNEL_COUNT) {
*temp_ptr = C_TO_K(temp_val[idx]);
return EC_SUCCESS;
}
return EC_ERROR_INVAL;
}
static void temp_sensor_poll(void)
{
int i, ret;
if (!has_power())
return;
for (i = 0; i < TMP468_CHANNEL_COUNT; i++)
if (fake_temp[i] != -1) {
temp_val[i] = fake_temp[i];
} else {
ret = raw_read16(TMP468_LOCAL + i, &temp_val[i]);
if (ret < 0)
return;
temp_val[i] >>= TMP468_SHIFT1;
}
}
DECLARE_HOOK(HOOK_SECOND, temp_sensor_poll, HOOK_PRIO_TEMP_SENSOR);
int tmp468_set_power(enum tmp468_power_state power_on)
{
uint8_t shutdown = (power_on == TMP468_POWER_OFF) ? 1 : 0;
return tmp468_shutdown(shutdown);
}
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