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/* Copyright (c) 2011 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.
*/
/* Temperature sensor module for Chrome EC */
#include "chip_temp_sensor.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "i2c.h"
#include "host_command.h"
#include "peci.h"
#include "task.h"
#include "temp_sensor.h"
#include "thermal.h"
#include "timer.h"
#include "tmp006.h"
#include "util.h"
/* Defined in board_temp_sensor.c. Must be in the same order as
* in enum temp_sensor_id.
*/
extern const struct temp_sensor_t temp_sensors[TEMP_SENSOR_COUNT];
int temp_sensor_read(enum temp_sensor_id id, int *temp_ptr)
{
const struct temp_sensor_t *sensor;
if (id < 0 || id >= TEMP_SENSOR_COUNT)
return EC_ERROR_INVAL;
sensor = temp_sensors + id;
return sensor->read(sensor->idx, temp_ptr);
}
void poll_slow_sensors(void)
{
/* Poll every second */
#ifdef CONFIG_TMP006
tmp006_poll();
#endif
#ifdef CHIP_lm4
chip_temp_sensor_poll();
#endif
}
static void poll_fast_sensors(void)
{
/* Poll every 1/4 second */
#ifdef CONFIG_PECI
peci_temp_sensor_poll();
#endif
}
static void update_mapped_memory(void)
{
int i, t;
uint8_t *mptr = host_get_memmap(EC_MEMMAP_TEMP_SENSOR);
for (i = 0; i < TEMP_SENSOR_COUNT; i++, mptr++) {
/*
* Switch to second range if first one is full, or stop if
* second range is also full.
*/
if (i == EC_TEMP_SENSOR_ENTRIES)
mptr = host_get_memmap(EC_MEMMAP_TEMP_SENSOR_B);
else if (i >= EC_TEMP_SENSOR_ENTRIES +
EC_TEMP_SENSOR_B_ENTRIES)
break;
switch (temp_sensor_read(i, &t)) {
case EC_ERROR_NOT_POWERED:
*mptr = EC_TEMP_SENSOR_NOT_POWERED;
break;
case EC_SUCCESS:
*mptr = t - EC_TEMP_SENSOR_OFFSET;
break;
default:
*mptr = EC_TEMP_SENSOR_ERROR;
}
}
}
void temp_sensor_task(void)
{
int i;
uint8_t *base, *base_b;
/*
* Initialize memory-mapped data. We initialize valid sensors to 23 C
* so that if a temperature value is read before we actually poll the
* sensors, we don't end up with an insane value.
*/
base = host_get_memmap(EC_MEMMAP_TEMP_SENSOR);
base_b = host_get_memmap(EC_MEMMAP_TEMP_SENSOR_B);
for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
if (i < EC_TEMP_SENSOR_ENTRIES)
base[i] = 0x60; /* 23 C */
else
base_b[i - EC_TEMP_SENSOR_ENTRIES] = 0x60; /* 23 C */
}
/* Set the rest of memory region to SENSOR_NOT_PRESENT */
for (; i < EC_TEMP_SENSOR_ENTRIES + EC_TEMP_SENSOR_B_ENTRIES; ++i) {
if (i < EC_TEMP_SENSOR_ENTRIES)
base[i] = EC_TEMP_SENSOR_NOT_PRESENT;
else
base_b[i - EC_TEMP_SENSOR_ENTRIES] =
EC_TEMP_SENSOR_NOT_PRESENT;
}
/* Temp sensor data is present, with B range supported. */
*host_get_memmap(EC_MEMMAP_THERMAL_VERSION) = 2;
while (1) {
for (i = 0; i < 4; ++i) {
usleep(250000);
poll_fast_sensors();
}
poll_slow_sensors();
update_mapped_memory();
}
}
/*****************************************************************************/
/* Console commands */
static int command_temps(int argc, char **argv)
{
int t, i;
int rv, rv1 = EC_SUCCESS;
for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
ccprintf(" %-20s: ", temp_sensors[i].name);
rv = temp_sensor_read(i, &t);
if (rv) {
ccprintf("Error %d\n", rv);
rv1 = rv;
} else
ccprintf("%d K = %d C\n", t, t - 273);
}
return rv1;
}
DECLARE_CONSOLE_COMMAND(temps, command_temps,
NULL,
"Print temp sensors",
NULL);
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