edgar: Add thermal sensor from ADC0

Add thermal sensor from ADC0

BUG=none
BRANCH=firmware-strago-7287.B
TEST=Read temperature and mapping with measure.

Change-Id: Idfaf09bea112a7d209b54c3cc912aaf64fe251aa
Signed-off-by: michael5 <michael5_chen@pegatroncorp.com>
Reviewed-on: https://chromium-review.googlesource.com/319706
Reviewed-by: Shawn N <shawnn@chromium.org>

2 files changed, 58 insertions, 1 deletions

diff --git a/board/edgar/board.c b/board/edgar/board.c
index 6a33fb5cd2..229bc02ed4 100644
--- a/board/edgar/board.c
+++ b/board/edgar/board.c
@@ -27,6 +27,7 @@
 #include "thermal.h"
 #include "uart.h"
 #include "util.h"
+#include "adc_chip.h"
 
 #define GPIO_KB_INPUT (GPIO_INPUT | GPIO_PULL_UP)
 #define GPIO_KB_OUTPUT (GPIO_ODR_HIGH)
@@ -34,6 +35,8 @@
 
 #include "gpio_list.h"
 
+static int adc_get_val(int idx, int *temp_ptr);
+
 /* power signal list.  Must match order of enum power_signal. */
 const struct power_signal_info power_signal_list[] = {
 	{GPIO_ALL_SYS_PGOOD,     1, "ALL_SYS_PWRGD"},
@@ -43,6 +46,11 @@ const struct power_signal_info power_signal_list[] = {
 };
 BUILD_ASSERT(ARRAY_SIZE(power_signal_list) == POWER_SIGNAL_COUNT);
 
+const struct adc_t adc_channels[] = {
+	{"ADC0", 1, 1, 0, 0},
+};
+BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
+
 const struct i2c_port_t i2c_ports[]  = {
 	{"batt_chg", MEC1322_I2C0_0, 100,
 		GPIO_I2C_PORT0_0_SCL, GPIO_I2C_PORT0_0_SDA},
@@ -69,6 +77,8 @@ const struct temp_sensor_t temp_sensors[] = {
 		TMP432_IDX_REMOTE1, 4},
 	{"TMP432_Sensor_2", TEMP_SENSOR_TYPE_BOARD, tmp432_get_val,
 		TMP432_IDX_REMOTE2, 4},
+	{"ADC_Sensor_1", TEMP_SENSOR_TYPE_BOARD, adc_get_val,
+		ADC_CH_0, 4},
 	{"Battery", TEMP_SENSOR_TYPE_BATTERY, charge_temp_sensor_get_val,
 		0, 4},
 };
@@ -81,6 +91,7 @@ struct ec_thermal_config thermal_params[] = {
 	{{0, 0, 0}, 0, 0}, /* TMP432_Internal */
 	{{0, 0, 0}, 0, 0}, /* TMP432_Sensor_1 */
 	{{0, 0, 0}, 0, 0}, /* TMP432_Sensor_2 */
+	{{0, 0, 0}, 0, 0}, /* ADC_Sensor_1 */
 	{{0, 0, 0}, 0, 0}, /* Battery Sensor */
 };
 BUILD_ASSERT(ARRAY_SIZE(thermal_params) == TEMP_SENSOR_COUNT);
@@ -92,3 +103,45 @@ static void adc_pre_init(void)
 	gpio_config_module(MODULE_ADC, 1);
 }
 DECLARE_HOOK(HOOK_INIT, adc_pre_init, HOOK_PRIO_INIT_ADC - 1);
+
+static const int adc_temp[] = {
+	158780, 150690, 143060, 135870, 129070, 122660, 116600, 110870,
+	105450, 100330,  95488,  90904,  86565,  82456,  78565,  74878,
+	 71384,  68071,  64930,  61951,  59124,  56442,  53895,  51478,
+	 49181,  47000,  44927,  42957,  41084,  39303,  37609,  35997,
+	 34463,  33004,  31614,  30290,  29029,  27828,  26683,  25592,
+	 24551,  23559,  22613,  21710,  20848,  20025,  19239,  18489,
+	 17772,  17087,  16432,  15807,  15208,  14636,  14088,  13564,
+	 13063,  12582,  12123,  11682,  11260,  10856,  10468,  10097,
+	  9704,   9398,   9070,   8756,   8454,   8164,   7885,   7618,
+	  7361,   7114,   6876,   6648,   6429,   6217,   6014,   5819,
+	  5631,   5450,   5276,   5108,   4947,   4791,   4641,   4496,
+	  4357,   4223,   4093,   3968,   3848,   3732,   3620,   3511,
+	  3407,   3306,   3209,   3115,   3024,   2936,   2851,   2769,
+};
+
+static int adc_get_val(int idx, int *temp_ptr)
+{
+	int head, tail, mid;
+	int voltage_value = adc_read_channel(idx);
+	int ohm_value = (voltage_value == 1023)
+		? 158780 : (24900 * voltage_value) / (1023 - voltage_value);
+
+	/* Binary search to find proper table entry */
+	head = 0;
+	tail = ARRAY_SIZE(adc_temp)-1;
+	while (head != tail) {
+		mid = (head + tail) / 2;
+		if (adc_temp[mid] >= ohm_value &&
+		    adc_temp[mid+1] < ohm_value)
+			break;
+		if (adc_temp[mid] > ohm_value)
+			head = mid + 1;
+		else
+			tail = mid;
+	}
+
+	/* Offset 3 dergee */
+	*temp_ptr = C_TO_K(mid) + 3;
+	return EC_SUCCESS;
+}
diff --git a/board/edgar/board.h b/board/edgar/board.h
index e18a1ab87d..a4cd6e3328 100644
--- a/board/edgar/board.h
+++ b/board/edgar/board.h
@@ -62,6 +62,7 @@
 #define CONFIG_LED_COMMON
 
 #define CONFIG_I2C
+#define CONFIG_ADC
 
 /* Wireless signals */
 #define WIRELESS_GPIO_WLAN	GPIO_WLAN_OFF_L
@@ -72,7 +73,6 @@
 #undef CONFIG_PSTORE
 #undef CONFIG_PECI
 #undef CONFIG_FANS
-#undef CONFIG_ADC
 #ifndef __ASSEMBLER__
 
 #include "gpio_signal.h"
@@ -85,6 +85,8 @@
 
 /* ADC signal */
 enum adc_channel {
+	ADC_CH_0 = 0,
+
 	/* Number of ADC channels */
 	ADC_CH_COUNT
 };
@@ -105,6 +107,8 @@ enum temp_sensor_id {
 	TEMP_SENSOR_I2C_TMP432_LOCAL,
 	TEMP_SENSOR_I2C_TMP432_REMOTE1,
 	TEMP_SENSOR_I2C_TMP432_REMOTE2,
+	/* ADC Sensors */
+	TEMP_SENSOR_ADC_SENSOR1,
 
 	/* Battery temperature sensor */
 	TEMP_SENSOR_BATTERY,