diff options
author | Wonjoon Lee <woojoo.lee@samsung.com> | 2015-09-02 13:41:27 +0900 |
---|---|---|
committer | chrome-bot <chrome-bot@chromium.org> | 2015-09-11 00:45:38 -0700 |
commit | 8acda59faaf9b71768a95ec2c36eb756c7643194 (patch) | |
tree | 8fb56f59b64716bb4d2c3bcb7b6390e128f398a9 /driver/temp_sensor | |
parent | 502dc50f04c5df787e95982cef4971b20e501cba (diff) | |
download | chrome-ec-8acda59faaf9b71768a95ec2c36eb756c7643194.tar.gz |
driver/temp_sensor: Add support thermistor on EC's own ADC
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>
Diffstat (limited to 'driver/temp_sensor')
-rw-r--r-- | driver/temp_sensor/ec_adc.c | 56 | ||||
-rw-r--r-- | driver/temp_sensor/ec_adc.h | 24 |
2 files changed, 80 insertions, 0 deletions
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 */ |