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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 "i2c.h"
#include "temp_sensor.h"
#include "uart.h"
#include "util.h"
#include "console.h"
#include "board.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)
{
const struct temp_sensor_t *sensor;
if (id < 0 || id >= TEMP_SENSOR_COUNT)
return -1;
sensor = temp_sensors + id;
return sensor->read(sensor);
}
int temp_sensor_tmp006_read_die_temp(const struct temp_sensor_t* sensor)
{
int traw, t;
int rv;
int addr = sensor->addr;
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
if (rv)
return -1;
t = (int)(int16_t)traw / 128;
return t + 273;
}
/* Calculate the remote object temperature.
* Parameters:
* Tdie: Die temperature in 1/100 K.
* Vobj: Voltage read from register 0. In nV.
* S0: Sensitivity factor in 1/1000.
* Return:
* Object temperature in 1/100 K.
*/
int temp_sensor_tmp006_calculate_object_temp(int Tdie, int Vobj, int S0)
{
int32_t Tx, S19, Vos, Vx, fv9, ub, lb;
/* Calculate according to TMP006 users guide.
* Division is delayed when possible to preserve precision, but should
* not cause overflow.
* Assuming Tdie is between 200K and 400K, and S0 between 3e-14 and
* 9e-14, the maximum value during the calculation should be less than
* (1 << 30), which fits in int32_t.
*/
Tx = Tdie - 29815;
/* S19 is the sensitivity multipled by 1e19 */
S19 = S0 * (100000 + 175 * Tx / 100 -
1678 * Tx / 100 * Tx / 100000) / 1000;
/* Vos is the offset voltage in nV */
Vos = -29400 - 570 * Tx / 100 + 463 * Tx / 100 * Tx / 10000;
Vx = Vobj - Vos;
/* fv9 is Seebeck coefficient f(Vobj) multipled by 1e9 */
fv9 = Vx + 134 * Vx / 100000 * Vx / 100000;
/* The last step in the calculation involves square root, so we use
* binary search.
* Assuming the object temperature is between 200K and 400K, the search
* should take at most 14 iterations.
*/
ub = 40000;
lb = 20000;
while (lb != ub) {
int32_t t, rhs, lhs;
t = (ub + lb) / 2;
lhs = t / 100 * t / 10000 * t / 10000 * (S19/100) / 1000 * t;
rhs = Tdie / 100 * Tdie / 10000 * Tdie / 10000 * (S19/100) / 1000 *
Tdie + fv9 * 1000;
if (lhs > rhs)
ub = t;
else
lb = t + 1;
}
return ub;
}
int temp_sensor_tmp006_read_object_temp(const struct temp_sensor_t* sensor)
{
int traw, t;
int vraw, v;
int rv;
int addr = sensor->addr;
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
if (rv)
return -1;
t = (int)(int16_t)traw / 128 + 273;
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
if (rv)
return -1;
v = ((int)(int16_t)vraw * 15625) / 100;
return temp_sensor_tmp006_calculate_object_temp(t * 100, v, 6400);
}
void temp_sensor_tmp006_config(const struct temp_sensor_t* sensor)
{
int addr = sensor->addr;
/* Configure the sensor:
* 0x7000 = bits 14:12 = continuous conversion
* 0x0400 = bits 11:9 = ADC conversion rate (1/sec)
* 0x0100 = bit 8 = DRDY pin enabled */
/* TODO: support shutdown mode for power-saving? */
i2c_write16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, 0x7500);
}
int temp_sensor_tmp006_print(const struct temp_sensor_t* sensor)
{
int vraw, v;
int traw, t;
int rv;
int d;
int addr = sensor->addr;
uart_printf("Debug data from %s:\n", sensor->name);
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xfe, &d);
if (rv)
return rv;
uart_printf(" Manufacturer ID: 0x%04x\n", d);
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xff, &d);
uart_printf(" Device ID: 0x%04x\n", d);
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &d);
uart_printf(" Config: 0x%04x\n", d);
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
v = ((int)(int16_t)vraw * 15625) / 100;
uart_printf(" Voltage: 0x%04x = %d nV\n", vraw, v);
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
t = ((int)(int16_t)traw * 100) / 128;
uart_printf(" Temperature: 0x%04x = %d.%02d C\n",
traw, t / 100, t > 0 ? t % 100 : 100 - (t % 100));
return EC_SUCCESS;
}
/*****************************************************************************/
/* Console commands */
static int command_temps(int argc, char **argv)
{
int i;
int rv = 0;
int t;
uart_puts("Reading temperature sensors...\n");
for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
uart_printf(" Temp from %s: ", temp_sensors[i].name);
t = temp_sensor_read(i);
if (t < 0) {
uart_printf("Error.\n\n");
rv = -1;
}
else
uart_printf("%d K\n\n", t);
}
if (rv == -1)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(temps, command_temps);
static int command_sensor_info(int argc, char **argv)
{
int i;
int rv;
const struct temp_sensor_t* sensor;
for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
sensor = temp_sensors + i;
if (sensor->print == TEMP_SENSOR_NO_PRINT)
continue;
rv = sensor->print(sensor);
if (rv != EC_SUCCESS)
return rv;
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(tempsinfo, command_sensor_info);
/* TMP006 object temperature calculation command.
* TODO: This command is only for debugging. Remove it when temporal correciton
* is done.
*/
static int command_sensor_remote(int argc, char **argv)
{
char *e;
int32_t Td2, Vobj9, Sm03;
if (argc != 4) {
uart_puts("Usage: tempcorrect <Tdie*100> <Vobj*10^9> <S0*10^11>\n");
return EC_ERROR_UNKNOWN;
}
Td2 = strtoi(argv[1], &e, 0);
if (e && *e) {
uart_puts("Bad Tdie.\n");
return EC_ERROR_UNKNOWN;
}
Vobj9 = strtoi(argv[2], &e, 0);
if (e && *e) {
uart_puts("Bad Vobj.\n");
return EC_ERROR_UNKNOWN;
}
Sm03 = strtoi(argv[3], &e, 0);
if (e && *e) {
uart_puts("Bad S0.\n");
return EC_ERROR_UNKNOWN;
}
uart_printf("%d\n",
temp_sensor_tmp006_calculate_object_temp(Td2, Vobj9, Sm03));
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(tempremote, command_sensor_remote);
/*****************************************************************************/
/* Initialization */
int temp_sensor_init(void)
{
return EC_SUCCESS;
}
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