brya: Add thermistor support

This adds support for the two thermistors on brya.

BRANCH=none
BUG=b:173575131
TEST=buildall passes

Change-Id: I198e1ce72910d1798c51cf5c99c9f1f0601f3c31
Signed-off-by: Caveh Jalali <caveh@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2706263
Commit-Queue: Keith Short <keithshort@chromium.org>
Reviewed-by: Keith Short <keithshort@chromium.org>

3 files changed, 65 insertions, 1 deletions

diff --git a/board/brya/board.h b/board/brya/board.h
index 4a603df8ee..d5e1b23d70 100644
--- a/board/brya/board.h
+++ b/board/brya/board.h
@@ -14,7 +14,6 @@
 /*
  * Disable features enabled by default.
  */
-#undef CONFIG_ADC
 #undef CONFIG_HIBERNATE
 #undef CONFIG_SPI_FLASH
 #undef CONFIG_SWITCH
@@ -71,11 +70,29 @@
 #define I2C_PORT_CHARGER	NPCX_I2C_PORT7_0
 #define I2C_PORT_EEPROM		NPCX_I2C_PORT7_0
 
+/* Thermal features */
+#define CONFIG_THERMISTOR
+#define CONFIG_TEMP_SENSOR
+#define CONFIG_TEMP_SENSOR_POWER_GPIO	GPIO_SEQ_EC_DSW_PWROK
+#define CONFIG_STEINHART_HART_3V3_30K9_47K_4050B
+
 #ifndef __ASSEMBLER__
 
 #include "gpio_signal.h"	/* needed by registers.h */
 #include "registers.h"
 
+enum adc_channel {
+	ADC_TEMP_SENSOR_1_DDR_SOC,
+	ADC_TEMP_SENSOR_2_CHARGER,
+	ADC_CH_COUNT
+};
+
+enum temp_sensor_id {
+	TEMP_SENSOR_1_DDR_SOC,
+	TEMP_SENSOR_2_CHARGER,
+	TEMP_SENSOR_COUNT
+};
+
 enum ioex_port {
 	IOEX_C0_NCT38XX = 0,
 	IOEX_C2_NCT38XX,
diff --git a/board/brya/build.mk b/board/brya/build.mk
index ce658b6e2f..bfe748269e 100644
--- a/board/brya/build.mk
+++ b/board/brya/build.mk
@@ -17,4 +17,5 @@ board-y+=board.o
 board-y+=fans.o
 board-y+=i2c.o
 board-y+=pwm.o
+board-y+=sensors.o
 board-y+=usbc_config.o
diff --git a/board/brya/sensors.c b/board/brya/sensors.c
new file mode 100644
index 0000000000..bb51eb245b
--- /dev/null
+++ b/board/brya/sensors.c
@@ -0,0 +1,46 @@
+/* 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 "common.h"
+
+#include "adc_chip.h"
+#include "temp_sensor.h"
+#include "thermistor.h"
+
+/* ADC configuration */
+const struct adc_t adc_channels[] = {
+	[ADC_TEMP_SENSOR_1_DDR_SOC] = {
+		.name = "TEMP_DDR_SOC",
+		.input_ch = NPCX_ADC_CH0,
+		.factor_mul = ADC_MAX_VOLT,
+		.factor_div = ADC_READ_MAX + 1,
+		.shift = 0,
+	},
+	[ADC_TEMP_SENSOR_2_CHARGER] = {
+		.name = "TEMP_CHARGER",
+		.input_ch = NPCX_ADC_CH1,
+		.factor_mul = ADC_MAX_VOLT,
+		.factor_div = ADC_READ_MAX + 1,
+		.shift = 0,
+	},
+};
+BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
+
+/* Temperature sensor configuration */
+const struct temp_sensor_t temp_sensors[] = {
+	[TEMP_SENSOR_1_DDR_SOC] = {
+		.name = "DDR and SOC",
+		.type = TEMP_SENSOR_TYPE_BOARD,
+		.read = get_temp_3v3_30k9_47k_4050b,
+		.idx = ADC_TEMP_SENSOR_1_DDR_SOC
+	},
+	[TEMP_SENSOR_2_CHARGER] = {
+		.name = "Charger",
+		.type = TEMP_SENSOR_TYPE_BOARD,
+		.read = get_temp_3v3_30k9_47k_4050b,
+		.idx = ADC_TEMP_SENSOR_2_CHARGER
+	},
+};
+BUILD_ASSERT(ARRAY_SIZE(temp_sensors) == TEMP_SENSOR_COUNT);