kukui: implement pogo adc interrupt

enable/disable pogo power supply when POGO_ADC_INT_L detected.

BUG=b:131389131
TEST=make
BRANCH=None

Change-Id: I875b8b65c3077d2e7aeca312f244d178917e634b
Signed-off-by: Ting Shen <phoenixshen@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1585485
Commit-Ready: Ting Shen <phoenixshen@chromium.org>
Tested-by: Ting Shen <phoenixshen@chromium.org>
Reviewed-by: Yilun Lin <yllin@chromium.org>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>

5 files changed, 100 insertions, 4 deletions

diff --git a/board/kukui/base_detect_krane.c b/board/kukui/base_detect_krane.c
new file mode 100644
index 0000000000..b39375860d
--- /dev/null
+++ b/board/kukui/base_detect_krane.c
@@ -0,0 +1,86 @@
+/* Copyright 2019 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 "adc.h"
+#include "board.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "timer.h"
+
+/* Krane base detection code */
+
+/* Base detection and debouncing */
+#define BASE_DETECT_DEBOUNCE_US (20 * MSEC)
+
+/*
+ * If the base status is unclear (i.e. not within expected ranges, read
+ * the ADC value again every 500ms.
+ */
+#define BASE_DETECT_RETRY_US (500 * MSEC)
+
+/**
+ * ADC value to indicate device is attached to a keyboard.
+ * 3.3V, 10K + 1K ohm => 0.3V, +10% margin.
+ */
+#define KEYBOARD_DETECT_MIN_MV 270
+#define KEYBOARD_DETECT_MAX_MV 330
+
+/**
+ * Minimum ADC value to indicate device is attached to a dock, or disconnected.
+ * 3.3V, 10K + 100K ohm => 3V, +10% margin.
+ */
+#define DOCK_DETECT_MIN_MV 2700
+
+static uint64_t base_detect_debounce_time;
+
+static void base_detect_deferred(void);
+DECLARE_DEFERRED(base_detect_deferred);
+
+static void base_detect_deferred(void)
+{
+	uint64_t time_now = get_time().val;
+	int v;
+
+	if (base_detect_debounce_time > time_now) {
+		hook_call_deferred(&base_detect_deferred_data,
+				   base_detect_debounce_time - time_now);
+		return;
+	}
+
+	v = adc_read_channel(ADC_POGO_ADC_INT_L);
+	if (v == ADC_READ_ERROR)
+		return;
+
+	if (v >= KEYBOARD_DETECT_MIN_MV && v <= KEYBOARD_DETECT_MAX_MV) {
+		gpio_set_level(GPIO_EN_PP3300_POGO, 1);
+		return;
+	}
+
+	if (v >= DOCK_DETECT_MIN_MV) {
+		gpio_set_level(GPIO_EN_PP3300_POGO, 0);
+		return;
+	}
+
+	/* Unclear base status, schedule again in a while. */
+	hook_call_deferred(&base_detect_deferred_data, BASE_DETECT_RETRY_US);
+}
+
+void pogo_adc_interrupt(enum gpio_signal signal)
+{
+	uint64_t time_now = get_time().val;
+
+	if (base_detect_debounce_time <= time_now) {
+		hook_call_deferred(&base_detect_deferred_data,
+				   BASE_DETECT_DEBOUNCE_US);
+	}
+
+	base_detect_debounce_time = time_now + BASE_DETECT_DEBOUNCE_US;
+}
+
+static void base_init(void)
+{
+	hook_call_deferred(&base_detect_deferred_data, 0);
+}
+DECLARE_HOOK(HOOK_INIT, base_init, HOOK_PRIO_DEFAULT + 1);
diff --git a/board/kukui/board.c b/board/kukui/board.c
index 46e387ae62..166ea32fe1 100644
--- a/board/kukui/board.c
+++ b/board/kukui/board.c
@@ -204,6 +204,13 @@ int pd_snk_is_vbus_provided(int port)
 	return rt946x_is_vbus_ready();
 }
 
+#ifdef BOARD_KUKUI
+/* dummy interrupt function for kukui */
+void pogo_adc_interrupt(enum gpio_signal signal)
+{
+}
+#endif
+
 static void board_init(void)
 {
 	/* If the reset cause is external, pulse PMIC force reset. */
@@ -235,6 +242,9 @@ static void board_init(void)
 
 	/* Enable gauge interrupt from max17055 */
 	gpio_enable_interrupt(GPIO_GAUGE_INT_ODL);
+
+	/* Enable pogo interrupt */
+	gpio_enable_interrupt(GPIO_POGO_ADC_INT_L);
 }
 DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
 
diff --git a/board/kukui/board.h b/board/kukui/board.h
index 3eff3b3d9e..01b91d5c29 100644
--- a/board/kukui/board.h
+++ b/board/kukui/board.h
@@ -242,6 +242,7 @@ void emmc_cmd_interrupt(enum gpio_signal signal);
 void board_reset_pd_mcu(void);
 int board_get_version(void);
 int board_is_sourcing_vbus(int port);
+void pogo_adc_interrupt(enum gpio_signal signal);
 
 #endif /* !__ASSEMBLER__ */
 
diff --git a/board/kukui/build.mk b/board/kukui/build.mk
index 02ef585861..5c408de94a 100644
--- a/board/kukui/build.mk
+++ b/board/kukui/build.mk
@@ -13,5 +13,6 @@ CHIP_VARIANT:=stm32f09x
 
 board-y=battery.o board.o usb_pd_policy.o led.o
 board-$(CONFIG_BOOTBLOCK)+=emmc.o
+board-$(BOARD_KRANE)+=base_detect_krane.o
 
 $(out)/RO/board/$(BOARD)/emmc.o: $(out)/bootblock_data.h
diff --git a/board/kukui/gpio.inc b/board/kukui/gpio.inc
index 2581810d68..1b5333fbeb 100644
--- a/board/kukui/gpio.inc
+++ b/board/kukui/gpio.inc
@@ -43,10 +43,8 @@ GPIO_INT(HALL_INT_L,        PIN(C, 5),  GPIO_INT_FALLING,
          hall_interrupt)
 GPIO_INT(GAUGE_INT_ODL,     PIN(C, 9),  GPIO_INT_FALLING | GPIO_PULL_UP,
          gauge_interrupt)
-
-/* Interrupts not implemented yet */
-/* TODO(b:122993147): It's also an analog input. */
-GPIO(POGO_ADC_INT_L,        PIN(A, 6), GPIO_INPUT)
+GPIO_INT(POGO_ADC_INT_L,    PIN(A, 6),  GPIO_INT_BOTH | GPIO_ANALOG,
+         pogo_adc_interrupt)
 
 /* Reset pins */
 GPIO(AP_SYS_RST_L,         PIN(C, 11), GPIO_OUT_LOW)