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/* Copyright 2021 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.
*/
#include <zephyr.h>
#include <ztest.h>
#include <drivers/adc.h>
#include <drivers/adc/adc_emul.h>
#include <drivers/gpio.h>
#include <drivers/gpio/gpio_emul.h>
#include "common.h"
#include "../driver/temp_sensor/thermistor.h"
#define GPIO_PG_EC_DSW_PWROK_PATH DT_PATH(named_gpios, pg_ec_dsw_pwrok)
#define GPIO_PG_EC_DSW_PWROK_PORT DT_GPIO_PIN(GPIO_PG_EC_DSW_PWROK_PATH, gpios)
#define ADC_DEVICE_NODE DT_NODELABEL(adc0)
#define TEMP_3V3_13K7_47K_4050B_INST DT_INST(0, temp_3v3_13k7_47k_4050b)
#define ADC_CHANNEL_3V3_13K7_47K_4050B \
DT_PROP(DT_PHANDLE(TEMP_3V3_13K7_47K_4050B_INST, adc), channel)
#define TEMP_3V3_30K9_47K_4050B_INST DT_INST(0, temp_3v3_30k9_47k_4050b)
#define ADC_CHANNEL_3V3_30K9_47K_4050B \
DT_PROP(DT_PHANDLE(TEMP_3V3_30K9_47K_4050B_INST, adc), channel)
#define TEMP_3V3_51K1_47K_4050B_INST DT_INST(0, temp_3v3_51k1_47k_4050b)
#define ADC_CHANNEL_3V3_51K1_47K_4050B \
DT_PROP(DT_PHANDLE(TEMP_3V3_51K1_47K_4050B_INST, adc), channel)
#define TEMP_3V0_22K6_47K_4050B_INST DT_INST(0, temp_3v0_22k6_47k_4050b)
#define ADC_CHANNEL_3V0_22K6_47K_4050B \
DT_PROP(DT_PHANDLE(TEMP_3V0_22K6_47K_4050B_INST, adc), channel)
/* Conversion of temperature doesn't need to be 100% accurate */
#define TEMP_EPS 2
/**
* Test if get temp function return expected error when ADC is not powered
* (indicated as GPIO pin set to low) and return success after powering on ADC.
*/
static void test_thermistor_power_pin(void)
{
const struct device *gpio_dev =
DEVICE_DT_GET(DT_GPIO_CTLR(GPIO_PG_EC_DSW_PWROK_PATH, gpios));
const struct device *adc_dev = DEVICE_DT_GET(ADC_DEVICE_NODE);
int temp;
zassert_not_null(gpio_dev, "Cannot get GPIO device");
zassert_not_null(adc_dev, "Cannot get ADC device");
/* Make sure that ADC return any valid value */
zassert_ok(adc_emul_const_value_set(adc_dev,
ADC_CHANNEL_3V3_13K7_47K_4050B,
1000),
"adc_emul_const_value_set() failed");
zassert_ok(adc_emul_const_value_set(adc_dev,
ADC_CHANNEL_3V3_30K9_47K_4050B,
1000),
"adc_emul_const_value_set() failed");
zassert_ok(adc_emul_const_value_set(adc_dev,
ADC_CHANNEL_3V3_51K1_47K_4050B,
1000),
"adc_emul_const_value_set() failed");
zassert_ok(adc_emul_const_value_set(adc_dev,
ADC_CHANNEL_3V0_22K6_47K_4050B,
1000),
"adc_emul_const_value_set() failed");
/* pg_ec_dsw_pwrok = 0 means ADC is not powered. */
zassert_ok(gpio_emul_input_set(gpio_dev, GPIO_PG_EC_DSW_PWROK_PORT, 0),
NULL);
zassert_equal(EC_ERROR_NOT_POWERED,
get_temp_3v3_13k7_47k_4050b(
ADC_CHANNEL_3V3_13K7_47K_4050B, &temp),
NULL);
zassert_equal(EC_ERROR_NOT_POWERED,
get_temp_3v3_30k9_47k_4050b(
ADC_CHANNEL_3V3_30K9_47K_4050B, &temp),
NULL);
zassert_equal(EC_ERROR_NOT_POWERED,
get_temp_3v3_51k1_47k_4050b(
ADC_CHANNEL_3V3_51K1_47K_4050B, &temp),
NULL);
zassert_equal(EC_ERROR_NOT_POWERED,
get_temp_3v0_22k6_47k_4050b(
ADC_CHANNEL_3V0_22K6_47K_4050B, &temp),
NULL);
/* pg_ec_dsw_pwrok = 1 means ADC is powered. */
zassert_ok(gpio_emul_input_set(gpio_dev, GPIO_PG_EC_DSW_PWROK_PORT, 1),
NULL);
zassert_equal(EC_SUCCESS,
get_temp_3v3_13k7_47k_4050b(
ADC_CHANNEL_3V3_13K7_47K_4050B, &temp),
NULL);
zassert_equal(EC_SUCCESS,
get_temp_3v3_30k9_47k_4050b(
ADC_CHANNEL_3V3_30K9_47K_4050B, &temp),
NULL);
zassert_equal(EC_SUCCESS,
get_temp_3v3_51k1_47k_4050b(
ADC_CHANNEL_3V3_51K1_47K_4050B, &temp),
NULL);
zassert_equal(EC_SUCCESS,
get_temp_3v0_22k6_47k_4050b(
ADC_CHANNEL_3V0_22K6_47K_4050B, &temp),
NULL);
}
/** Simple ADC emulator custom function which always return error */
static int adc_error_func(const struct device *dev, unsigned int channel,
void *param, uint32_t *result)
{
return -EINVAL;
}
/** Test if get temp function return expected error on ADC malfunction */
static void test_thermistor_adc_read_error(void)
{
const struct device *adc_dev = DEVICE_DT_GET(ADC_DEVICE_NODE);
int temp;
zassert_not_null(adc_dev, "Cannot get ADC device");
/* Return error on all ADC channels */
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V3_13K7_47K_4050B,
adc_error_func, NULL),
"adc_emul_value_func_set() failed");
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V3_30K9_47K_4050B,
adc_error_func, NULL),
"adc_emul_value_func_set() failed");
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V3_51K1_47K_4050B,
adc_error_func, NULL),
"adc_emul_value_func_set() failed");
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V0_22K6_47K_4050B,
adc_error_func, NULL),
"adc_emul_value_func_set() failed");
zassert_equal(EC_ERROR_UNKNOWN,
get_temp_3v3_13k7_47k_4050b(
ADC_CHANNEL_3V3_13K7_47K_4050B, &temp),
NULL);
zassert_equal(EC_ERROR_UNKNOWN,
get_temp_3v3_30k9_47k_4050b(
ADC_CHANNEL_3V3_30K9_47K_4050B, &temp),
NULL);
zassert_equal(EC_ERROR_UNKNOWN,
get_temp_3v3_51k1_47k_4050b(
ADC_CHANNEL_3V3_51K1_47K_4050B, &temp),
NULL);
zassert_equal(EC_ERROR_UNKNOWN,
get_temp_3v0_22k6_47k_4050b(
ADC_CHANNEL_3V0_22K6_47K_4050B, &temp),
NULL);
}
/** Get resistance of thermistor for given temperature */
static int resistance(int t)
{
/* Thermistor manufacturer resistance lookup table*/
int r_table[] = {
155700, 147900, 140600, 133700, 127200, /* 0*C - 4*C */
121000, 115100, 109600, 104300, 99310, /* 5*C - 9*C */
94600, 90130, 85890, 81870, 78070, /* 10*C - 14*C */
74450, 71020, 67770, 64680, 61750, /* 15*C - 19*C */
58970, 56320, 53810, 51430, 49160, /* 20*C - 24*C */
47000, 44950, 42990, 41130, 39360, /* 25*C - 29*C */
37680, 36070, 34540, 33080, 31690, /* 30*C - 34*C */
30360, 29100, 27900, 26750, 25650, /* 35*C - 39*C */
24610, 23610, 22660, 21750, 20880, /* 40*C - 44*C */
20050, 19260, 18500, 17780, 17090, /* 45*C - 49*C */
16430, 15800, 15200, 14620, 14070, /* 50*C - 54*C */
13540, 13030, 12550, 12090, 11640, /* 55*C - 59*C */
11210, 10800, 10410, 10040, 9676, /* 60*C - 64*C */
9331, 8999, 8680, 8374, 8081, /* 65*C - 69*C */
7799, 7528, 7268, 7018, 6777, /* 70*C - 74*C */
6546, 6324, 6111, 5906, 5708, /* 75*C - 79*C */
5518, 5335, 5160, 4990, 4827, /* 80*C - 84*C */
4671, 4519, 4374, 4233, 4098, /* 85*C - 89*C */
3968, 3842, 3721, 3605, 3492, /* 90*C - 94*C */
3384, 3279, 3179, 3082, 2988, /* 95*C - 99*C */
2898 /* 100*C */
};
t -= 273;
if (t < 0)
return r_table[0] + 10000;
if (t >= ARRAY_SIZE(r_table))
return r_table[ARRAY_SIZE(r_table) - 1] - 100;
return r_table[t];
}
/**
* Calculate output voltage in voltage divider circuit using formula
* Vout = Vs * r2 / (r1 + r2)
*/
static int volt_divider(int vs, int r1, int r2)
{
return vs * r2 / (r1 + r2);
}
struct thermistor_state {
const int v;
const int r;
int temp_expected;
};
/** ADC emulator function which calculate output voltage for given thermistor */
static int adc_temperature_func(const struct device *dev, unsigned int channel,
void *param, uint32_t *result)
{
struct thermistor_state *s = (struct thermistor_state *)param;
*result = volt_divider(s->v, s->r, resistance(s->temp_expected));
return 0;
}
/** Test conversion from ADC raw value to temperature */
static void test_thermistor_3v3_13k7_47k_4050b(void)
{
const struct device *adc_dev = DEVICE_DT_GET(ADC_DEVICE_NODE);
struct thermistor_state state = {
.v = 3300,
.r = 13700,
};
int temp_expected;
int temp;
zassert_not_null(adc_dev, "Cannot get ADC device");
/* Setup ADC channel */
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V3_13K7_47K_4050B,
adc_temperature_func, &state),
"adc_emul_value_func_set() failed");
/* Makes sure that reference voltage is correct for given thermistor */
zassert_ok(adc_emul_ref_voltage_set(adc_dev, ADC_REF_INTERNAL, state.v),
"adc_emul_ref_voltage_set() failed");
/* Test whole supported range from 0*C to 100*C (273*K to 373*K) */
for (temp_expected = 273; temp_expected <= 373; temp_expected++) {
state.temp_expected = temp_expected;
zassert_equal(EC_SUCCESS,
get_temp_3v3_13k7_47k_4050b(
ADC_CHANNEL_3V3_13K7_47K_4050B, &temp),
NULL);
zassert_within(temp_expected, temp, TEMP_EPS,
"Expected %d*K, got %d*K", temp_expected, temp);
}
/* Temperatures below 0*C should be reported as 0*C */
state.temp_expected = -15 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v3_13k7_47k_4050b(
ADC_CHANNEL_3V3_13K7_47K_4050B, &temp),
NULL);
zassert_equal(273, temp, "Expected %d*K, got %d*K", 273, temp);
/* Temperatures above 100*C should be reported as 100*C */
state.temp_expected = 115 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v3_13k7_47k_4050b(
ADC_CHANNEL_3V3_13K7_47K_4050B, &temp),
NULL);
zassert_equal(373, temp, "Expected %d*K, got %d*K", 373, temp);
}
/** Test conversion from ADC raw value to temperature */
static void test_thermistor_3v3_30k9_47k_4050b(void)
{
const struct device *adc_dev = DEVICE_DT_GET(ADC_DEVICE_NODE);
struct thermistor_state state = {
.v = 3300,
.r = 30900,
};
int temp_expected;
int temp;
zassert_not_null(adc_dev, "Cannot get ADC device");
/* Setup ADC channel */
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V3_30K9_47K_4050B,
adc_temperature_func, &state),
"adc_emul_value_func_set() failed");
/* Makes sure that reference voltage is correct for given thermistor */
zassert_ok(adc_emul_ref_voltage_set(adc_dev, ADC_REF_INTERNAL, state.v),
"adc_emul_ref_voltage_set() failed");
/* Test whole supported range from 0*C to 100*C (273*K to 373*K) */
for (temp_expected = 273; temp_expected <= 373; temp_expected++) {
state.temp_expected = temp_expected;
zassert_equal(EC_SUCCESS,
get_temp_3v3_30k9_47k_4050b(
ADC_CHANNEL_3V3_30K9_47K_4050B, &temp),
NULL);
zassert_within(temp_expected, temp, TEMP_EPS,
"Expected %d*K, got %d*K", temp_expected, temp);
}
/* Temperatures below 0*C should be reported as 0*C */
state.temp_expected = -15 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v3_30k9_47k_4050b(
ADC_CHANNEL_3V3_30K9_47K_4050B, &temp),
NULL);
zassert_equal(273, temp, "Expected %d*K, got %d*K", 273, temp);
/* Temperatures above 100*C should be reported as 100*C */
state.temp_expected = 115 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v3_30k9_47k_4050b(
ADC_CHANNEL_3V3_30K9_47K_4050B, &temp),
NULL);
zassert_equal(373, temp, "Expected %d*K, got %d*K", 373, temp);
}
/** Test conversion from ADC raw value to temperature */
static void test_thermistor_3v3_51k1_47k_4050b(void)
{
const struct device *adc_dev = DEVICE_DT_GET(ADC_DEVICE_NODE);
struct thermistor_state state = {
.v = 3300,
.r = 51100,
};
int temp_expected;
int temp;
zassert_not_null(adc_dev, "Cannot get ADC device");
/* Setup ADC channel */
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V3_51K1_47K_4050B,
adc_temperature_func, &state),
"adc_emul_value_func_set() failed");
/* Makes sure that reference voltage is correct for given thermistor */
zassert_ok(adc_emul_ref_voltage_set(adc_dev, ADC_REF_INTERNAL, state.v),
"adc_emul_ref_voltage_set() failed");
/* Test whole supported range from 0*C to 100*C (273*K to 373*K) */
for (temp_expected = 273; temp_expected <= 373; temp_expected++) {
state.temp_expected = temp_expected;
zassert_equal(EC_SUCCESS,
get_temp_3v3_51k1_47k_4050b(
ADC_CHANNEL_3V3_51K1_47K_4050B, &temp),
NULL);
zassert_within(temp_expected, temp, TEMP_EPS,
"Expected %d*K, got %d*K", temp_expected, temp);
}
/* Temperatures below 0*C should be reported as 0*C */
state.temp_expected = -15 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v3_51k1_47k_4050b(
ADC_CHANNEL_3V3_51K1_47K_4050B, &temp),
NULL);
zassert_equal(273, temp, "Expected %d*K, got %d*K", 273, temp);
/* Temperatures above 100*C should be reported as 100*C */
state.temp_expected = 115 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v3_51k1_47k_4050b(
ADC_CHANNEL_3V3_51K1_47K_4050B, &temp),
NULL);
zassert_equal(373, temp, "Expected %d*K, got %d*K", 373, temp);
}
/** Test conversion from ADC raw value to temperature */
static void test_thermistor_3v0_22k6_47k_4050b(void)
{
const struct device *adc_dev = DEVICE_DT_GET(ADC_DEVICE_NODE);
struct thermistor_state state = {
.v = 3000,
.r = 22600,
};
int temp_expected;
int temp;
zassert_not_null(adc_dev, "Cannot get ADC device");
/* Setup ADC channel */
zassert_ok(adc_emul_value_func_set(adc_dev,
ADC_CHANNEL_3V0_22K6_47K_4050B,
adc_temperature_func, &state),
"adc_emul_value_func_set() failed");
/* Makes sure that reference voltage is correct for given thermistor */
zassert_ok(adc_emul_ref_voltage_set(adc_dev, ADC_REF_INTERNAL, state.v),
"adc_emul_ref_voltage_set() failed");
/* Test whole supported range from 0*C to 100*C (273*K to 373*K) */
for (temp_expected = 273; temp_expected <= 373; temp_expected++) {
state.temp_expected = temp_expected;
zassert_equal(EC_SUCCESS,
get_temp_3v0_22k6_47k_4050b(
ADC_CHANNEL_3V0_22K6_47K_4050B, &temp),
NULL);
zassert_within(temp_expected, temp, TEMP_EPS,
"Expected %d*K, got %d*K", temp_expected, temp);
}
/* Temperatures below 0*C should be reported as 0*C */
state.temp_expected = -15 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v0_22k6_47k_4050b(
ADC_CHANNEL_3V0_22K6_47K_4050B, &temp),
NULL);
zassert_equal(273, temp, "Expected %d*K, got %d*K", 273, temp);
/* Temperatures above 100*C should be reported as 100*C */
state.temp_expected = 115 + 273;
zassert_equal(EC_SUCCESS,
get_temp_3v0_22k6_47k_4050b(
ADC_CHANNEL_3V0_22K6_47K_4050B, &temp),
NULL);
zassert_equal(373, temp, "Expected %d*K, got %d*K", 373, temp);
}
void test_suite_thermistor(void)
{
const struct device *dev =
DEVICE_DT_GET(DT_GPIO_CTLR(GPIO_PG_EC_DSW_PWROK_PATH, gpios));
zassert_not_null(dev, NULL);
/* Before tests make sure that power pin is set. */
zassert_ok(gpio_emul_input_set(dev, GPIO_PG_EC_DSW_PWROK_PORT, 1),
NULL);
ztest_test_suite(thermistor,
ztest_user_unit_test(test_thermistor_power_pin),
ztest_user_unit_test(test_thermistor_adc_read_error),
ztest_user_unit_test(
test_thermistor_3v3_13k7_47k_4050b),
ztest_user_unit_test(
test_thermistor_3v3_30k9_47k_4050b),
ztest_user_unit_test(
test_thermistor_3v3_51k1_47k_4050b),
ztest_user_unit_test(
test_thermistor_3v0_22k6_47k_4050b));
ztest_run_test_suite(thermistor);
}
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