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/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* OTI502 temperature sensor module for Chrome EC */
#include "common.h"
#include "console.h"
#include "oti502.h"
#include "i2c.h"
#include "hooks.h"
#include "util.h"
static int temp_val_ambient; /* Ambient is chip temperature*/
static int temp_val_object; /* Object is IR temperature */
static int oti502_read_block(const int offset, uint8_t *data, int len)
{
return i2c_read_block(I2C_PORT_THERMAL, OTI502_I2C_ADDR_FLAGS, offset,
data, len);
}
int oti502_get_val(int idx, int *temp_ptr)
{
switch (idx) {
case OTI502_IDX_AMBIENT:
*temp_ptr = temp_val_ambient;
break;
case OTI502_IDX_OBJECT:
*temp_ptr = temp_val_object;
break;
default:
return EC_ERROR_UNKNOWN;
}
return EC_SUCCESS;
}
static void temp_sensor_poll(void)
{
uint8_t temp_val[6];
memset(temp_val, 0, sizeof(temp_val));
oti502_read_block(0x80, temp_val, sizeof(temp_val));
if (temp_val[2] >= 0x80) {
/* Treat temperature as 0 degree C if temperature is negative*/
temp_val_ambient = 0;
ccprintf("Temperature ambient is negative !\n");
} else {
temp_val_ambient = ((temp_val[1] << 8) + temp_val[0]) / 200;
temp_val_ambient = C_TO_K(temp_val_ambient);
}
if (temp_val[5] >= 0x80) {
/* Treat temperature as 0 degree C if temperature is negative*/
temp_val_object = 0;
ccprintf("Temperature object is negative !\n");
} else {
temp_val_object = ((temp_val[4] << 8) + temp_val[5]) / 200;
temp_val_object = C_TO_K(temp_val_object);
}
}
DECLARE_HOOK(HOOK_SECOND, temp_sensor_poll, HOOK_PRIO_TEMP_SENSOR);
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