1 files changed, 70 insertions, 0 deletions
diff --git a/baseboard/volteer/battery_presence.c b/baseboard/volteer/battery_presence.c
new file mode 100644
index 0000000000..0d6590011f
--- /dev/null
+++ b/baseboard/volteer/battery_presence.c
@@ -0,0 +1,70 @@
+/* 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.
+ *
+ * Common battery presence checking for Volteer family.
+ * Each board should implement board_battery_info[] to define the specific
+ * battery packs supported.
+ */
+#include <stdbool.h>
+
+#include "battery.h"
+#include "battery_smart.h"
+#include "gpio.h"
+
+static enum battery_present batt_pres_prev = BP_NOT_SURE;
+
+enum battery_present battery_hw_present(void)
+{
+	/* The GPIO is low when the battery is physically present */
+	return gpio_get_level(GPIO_EC_BATT_PRES_ODL) ? BP_NO : BP_YES;
+}
+
+static bool battery_init(void)
+{
+	int batt_status;
+
+	return battery_status(&batt_status) ? 0 :
+		!!(batt_status & STATUS_INITIALIZED);
+}
+
+/*
+ * Physical detection of battery.
+ */
+static enum battery_present battery_check_present_status(void)
+{
+	enum battery_present batt_pres;
+
+	/* Get the physical hardware status */
+	batt_pres = battery_hw_present();
+
+	/*
+	 * If the battery is not physically connected, then no need to perform
+	 * any more checks.
+	 */
+	if (batt_pres != BP_YES)
+		return batt_pres;
+
+	/*
+	 * If the battery is present now and was present last time we checked,
+	 * return early.
+	 */
+	if (batt_pres == batt_pres_prev)
+		return batt_pres;
+
+	/*
+	 * Ensure that battery is:
+	 * 1. Not in cutoff
+	 * 2. Initialized
+	 */
+	if (battery_is_cut_off() || !battery_init())
+		batt_pres = BP_NO;
+
+	return batt_pres;
+}
+
+enum battery_present battery_is_present(void)
+{
+	batt_pres_prev = battery_check_present_status();
+	return batt_pres_prev;
+}