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driver/temp_sensor: Add support thermistor on EC's own ADC

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Add support for ADC / thermistor reads on the EC's ADC
This will support now only ncp15wb but we can expand it
at future time.

BUG=chrome-os-partner:44764
TEST=make buildall -j
Manual on celes with subsequent commit. Boot to S0, run "temps".
Verify that temperatures are. See temperature is changing
BRANCH=None

Change-Id: If26d24b803dcff00c4c24e4e1f71d3b0de8e6738
Signed-off-by: Wonjoon Lee <woojoo.lee@samsung.com>
Reviewed-on: https://chromium-review.googlesource.com/296872
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Wonjoon Lee
2015-09-02 13:41:27 +09:00
committed by chrome-bot
parent 502dc50f04
commit 8acda59faa
4 changed files with 82 additions and 0 deletions
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1
driver/build.mk
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@@ -54,6 +54,7 @@ driver-$(CONFIG_REGULATOR_IR357X)+=regulator_ir357x.o
# Temperature sensors
driver-$(CONFIG_TEMP_SENSOR_BD99992GW)+=temp_sensor/bd99992gw.o
driver-$(CONFIG_TEMP_SENSOR_EC_ADC)+=temp_sensor/ec_adc.o
driver-$(CONFIG_TEMP_SENSOR_G781)+=temp_sensor/g781.o
driver-$(CONFIG_TEMP_SENSOR_TMP006)+=temp_sensor/tmp006.o
driver-$(CONFIG_TEMP_SENSOR_TMP432)+=temp_sensor/tmp432.o

56
driver/temp_sensor/ec_adc.c Normal file
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@@ -0,0 +1,56 @@
/* Copyright 2015 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.
*/
/* EC_ADC driver for Chrome EC */
#include "adc.h"
#include "common.h"
#include "console.h"
#include "ec_adc.h"
#include "thermistor.h"
#include "util.h"
/* Get temperature from requested sensor */
static int get_temp(int idx, int *temp_ptr)
{
int temp_raw = 0;
/* Read 10-bit ADC result */
temp_raw = adc_read_channel(idx);
if (temp_raw == ADC_READ_ERROR)
return EC_ERROR_UNKNOWN;
/* TODO : Need modification here if the result is not 10-bit */
/* If there is no thermistor calculation function.
* 1. Add adjusting function like thermistor_ncp15wb.c
* 2. Place function here with ifdef
* 3. define it on board.h
*/
#ifdef CONFIG_THERMISTOR_NCP15WB
*temp_ptr = ncp15wb_calculate_temp((uint16_t) temp_raw);
#else
#error "Unknown thermistor for ec_adc"
return EC_ERROR_UNKNOWN;
#endif
return EC_SUCCESS;
}
int ec_adc_get_val(int idx, int *temp_ptr)
{
int ret;
int temp_c;
if(idx < 0 || idx >= ADC_CH_COUNT)
return EC_ERROR_INVAL;
ret = get_temp(idx, &temp_c);
if (ret == EC_SUCCESS)
*temp_ptr = C_TO_K(temp_c);
return ret;
}

24
driver/temp_sensor/ec_adc.h Normal file
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@@ -0,0 +1,24 @@
/* Copyright 2015 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.
*/
/* ec_adc which uses adc and thermistors module for Chrome EC
* Some EC has it's own ADC modules, define here EC's max ADC channels.
* We can consider every channel as a thermal sensor.
*/
#ifndef __CROS_EC_TEMP_SENSOR_EC_ADC_H
#define __CROS_EC_TEMP_SENSOR_EC_ADC_H
/**
* Get the latest value from the sensor.
*
* @param idx ADC channel to read.
* @param temp_ptr Destination for temperature in K.
*
* @return EC_SUCCESS if successful, non-zero if error.
*/
int ec_adc_get_val(int idx, int *temp_ptr);
#endif /* __CROS_EC_TEMP_SENSOR_EC_ADC_H */

1
include/config.h
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@@ -1493,6 +1493,7 @@
/* Support particular temperature sensor chips */
#undef CONFIG_TEMP_SENSOR_BD99992GW /* BD99992GW PMIC, on I2C bus */
#undef CONFIG_TEMP_SENSOR_EC_ADC /* Thermistors on EC's own ADC */
#undef CONFIG_TEMP_SENSOR_G781 /* G781 sensor, on I2C bus */
#undef CONFIG_TEMP_SENSOR_TMP006 /* TI TMP006 sensor, on I2C bus */
#undef CONFIG_TEMP_SENSOR_TMP432 /* TI TMP432 sensor, on I2C bus */