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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 "adc.h"
#include "board.h"
#include "console.h"
#include "i2c.h"
#include "temp_sensor.h"
#include "uart.h"
#include "util.h"
/* Address of first temp sensor in system */
#define TEMP0_ADDR ((0x40 << 1) | I2C_FLAG_BIG_ENDIAN)
/* TODO: support all 6 temp sensors */
/* Address of battery charger */
#define CHARGER_ADDR 0x12
/* Address of battery */
#define BATTERY_ADDR 0x16
int temp_sensor_read(enum temp_sensor_id id)
{
int traw, t;
int rv;
switch(id) {
case TEMP_SENSOR_CASE:
/* TODO: fix temperature correction factor. For now,
* just return the die temperature. */
return temp_sensor_read(TEMP_SENSOR_CASE_DIE);
case TEMP_SENSOR_CASE_DIE:
rv = i2c_read16(I2C_PORT_THERMAL, TEMP0_ADDR, 0x01, &traw);
if (rv)
return -1;
t = (int)(int16_t)traw / 128;
return t + 273;
case TEMP_SENSOR_EC_INTERNAL:
return adc_read_ec_temperature();
}
/* If we're still here, we don't handle that sensor */
return -1;
}
/*****************************************************************************/
/* Console commands */
static int command_temps(int argc, char **argv)
{
int vraw, v;
int traw, t;
int rv;
int d;
uart_puts("Reading temperature sensors...\n");
uart_printf(" Temp from die: %d K\n\n",
temp_sensor_read(TEMP_SENSOR_CASE_DIE));
uart_puts("Debug data:\n");
rv = i2c_read16(I2C_PORT_THERMAL, TEMP0_ADDR, 0xfe, &d);
if (rv)
return rv;
uart_printf(" Manufacturer ID: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_THERMAL, TEMP0_ADDR, 0xff, &d);
uart_printf(" Device ID: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_THERMAL, TEMP0_ADDR, 0x02, &d);
uart_printf(" Config: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_THERMAL, TEMP0_ADDR, 0x00, &vraw);
v = ((int)(int16_t)vraw * 15625) / 100;
uart_printf(" Voltage: 0x%04x = %d nV\n", vraw, v);
rv = i2c_read16(I2C_PORT_THERMAL, TEMP0_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));
/* TODO: correction factor from voltage offset */
return EC_SUCCESS;
}
/* TODO: the battery charger would normally be on a separate I2C bus.
* For evaluation, it's on the same bus as the thermal sensor, so I
* put the debug command here for now. */
static int command_charger(int argc, char **argv)
{
int rv;
int d;
uart_puts("Reading battery charger...\n");
rv = i2c_read16(I2C_PORT_CHARGER, CHARGER_ADDR, 0xfe, &d);
if (rv)
return rv;
uart_printf(" Manufacturer ID: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_CHARGER, CHARGER_ADDR, 0xff, &d);
uart_printf(" Device ID: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_CHARGER, CHARGER_ADDR, 0x12, &d);
uart_printf(" Option: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_CHARGER, CHARGER_ADDR, 0x14, &d);
uart_printf(" Charge current: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_CHARGER, CHARGER_ADDR, 0x15, &d);
uart_printf(" Charge voltage: 0x%04x\n", d);
rv = i2c_read16(I2C_PORT_CHARGER, CHARGER_ADDR, 0x3f, &d);
uart_printf(" Input current: 0x%04x\n", d);
return EC_SUCCESS;
}
/* TODO: the battery would normally be on a separate I2C bus. For
* evaluation, it's on the same bus as the thermal sensor so I put the
* debug command here for now. */
static int command_battery(int argc, char **argv)
{
int rv;
int d;
uart_puts("Reading battery...\n");
rv = i2c_read16(I2C_PORT_BATTERY, BATTERY_ADDR, 0x08, &d);
if (rv)
return rv;
uart_printf(" Temperature: 0x%04x = %d C\n",
d, (d-2731)/10);
rv = i2c_read16(I2C_PORT_BATTERY, BATTERY_ADDR, 0x09, &d);
uart_printf(" Voltage: 0x%04x = %d mV\n", d, d);
rv = i2c_read16(I2C_PORT_BATTERY, BATTERY_ADDR, 0x0f, &d);
uart_printf(" Remaining capacity: 0x%04x = %d mAh\n", d, d);
rv = i2c_read16(I2C_PORT_BATTERY, BATTERY_ADDR, 0x10, &d);
uart_printf(" Full charge capacity: 0x%04x = %d mAh\n", d, d);
rv = i2c_read16(I2C_PORT_BATTERY, BATTERY_ADDR, 0x14, &d);
uart_printf(" Desired charge current: 0x%04x = %d mA\n", d, d);
rv = i2c_read16(I2C_PORT_BATTERY, BATTERY_ADDR, 0x15, &d);
uart_printf(" Desired charge voltage: 0x%04x = %d mV\n", d, d);
return EC_SUCCESS;
}
static const struct console_command console_commands[] = {
{"temps", command_temps},
{"charger", command_charger},
{"battery", command_battery},
};
static const struct console_group command_group = {
"Temp sensor", console_commands, ARRAY_SIZE(console_commands)
};
/*****************************************************************************/
/* Initialization */
int temp_sensor_init(void)
{
volatile uint32_t scratch __attribute__((unused));
#ifdef CONFIG_SENSOR
/* TODO: not necessary since these are the power-on defaults,
* except for the DRDY pin. It's unclear DRDY will be used
* anyway. */
/* 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(I2C_PORT_THERMAL, TEMP0_ADDR, 0x02, 0x7500);
#endif
console_register_commands(&command_group);
return EC_SUCCESS;
}
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