Add inductive charging control module

This module controls the inductive charging transmitter. For now, the
policy is to charge whenever possible.

BUG=chrome-os-partner:31392
TEST=Unit test passed
BRANCH=None

Change-Id: Ie48a38ad92fe2bc3329c4962e96572f2bc40b4e6
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/212715

1 files changed, 103 insertions, 0 deletions

diff --git a/test/inductive_charging.c b/test/inductive_charging.c
new file mode 100644
index 0000000000..8a4a94df5f
--- /dev/null
+++ b/test/inductive_charging.c
@@ -0,0 +1,103 @@
+/* Copyright 2014 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.
+ *
+ * Test inductive charging module.
+ */
+
+#include "common.h"
+#include "console.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "inductive_charging.h"
+#include "lid_switch.h"
+#include "test_util.h"
+#include "timer.h"
+#include "util.h"
+
+static void wait_for_lid_debounce(void)
+{
+	while (lid_is_open() != gpio_get_level(GPIO_LID_OPEN))
+		msleep(20);
+}
+
+static void set_lid_open(int lid_open)
+{
+	gpio_set_level(GPIO_LID_OPEN, lid_open);
+	wait_for_lid_debounce();
+}
+
+static int test_lid(void)
+{
+	/* Lid is open initially */
+	set_lid_open(1);
+	gpio_set_level(GPIO_CHARGE_DONE, 0);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 0);
+
+	/* Close the lid. Transmitter should be enabled. */
+	set_lid_open(0);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 1);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 1);
+
+	/* Open the lid. Charging should stop. */
+	set_lid_open(1);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 0);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 0);
+
+	return EC_SUCCESS;
+}
+
+static int test_charge_done(void)
+{
+	/* Close the lid to start charging */
+	set_lid_open(0);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 1);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 1);
+
+	/* Charging is done. Stop charging, but don't turn off transmitter. */
+	gpio_set_level(GPIO_CHARGE_DONE, 1);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 1);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 0);
+
+	/* Oops, need charging again. */
+	gpio_set_level(GPIO_CHARGE_DONE, 0);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 1);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 1);
+
+	return EC_SUCCESS;
+}
+
+static int test_lid_open_during_charging(void)
+{
+	/* Close the lid. Start charging. */
+	set_lid_open(0);
+	gpio_set_level(GPIO_CHARGE_DONE, 0);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 1);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 1);
+
+	/* Open the lid. Transmitter should be turned off. */
+	set_lid_open(1);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 0);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 0);
+
+	/* Toggle charge done signal. Charging should not start. */
+	gpio_set_level(GPIO_CHARGE_DONE, 1);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 0);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 0);
+	gpio_set_level(GPIO_CHARGE_DONE, 0);
+	TEST_ASSERT(gpio_get_level(GPIO_BASE_CHG_VDD_EN) == 0);
+	TEST_ASSERT(gpio_get_level(GPIO_CHARGE_EN) == 0);
+
+	return EC_SUCCESS;
+}
+
+void run_test(void)
+{
+	test_reset();
+
+	RUN_TEST(test_lid);
+	RUN_TEST(test_charge_done);
+	RUN_TEST(test_lid_open_during_charging);
+
+	test_print_result();
+}