diff options
| -rw-r--r-- | driver/build.mk | 1 | ||||
| -rw-r--r-- | driver/temp_sensor/ec_adc.c | 56 | ||||
| -rw-r--r-- | driver/temp_sensor/ec_adc.h | 24 | ||||
| -rw-r--r-- | include/config.h | 1 |
4 files changed, 82 insertions, 0 deletions
diff --git a/driver/build.mk b/driver/build.mk index 70745ae07d..8875d45ccb 100644 --- a/driver/build.mk +++ b/driver/build.mk @@ -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 diff --git a/driver/temp_sensor/ec_adc.c b/driver/temp_sensor/ec_adc.c new file mode 100644 index 0000000000..db174e33dc --- /dev/null +++ b/driver/temp_sensor/ec_adc.c @@ -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; +} diff --git a/driver/temp_sensor/ec_adc.h b/driver/temp_sensor/ec_adc.h new file mode 100644 index 0000000000..8ff213e95d --- /dev/null +++ b/driver/temp_sensor/ec_adc.h @@ -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 */ diff --git a/include/config.h b/include/config.h index e301633315..e35f40d241 100644 --- a/include/config.h +++ b/include/config.h @@ -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 */ |