tests: pm: Add device wakeup test

Add a test to exercise PM device wakeup API.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>

tests/subsys/pm/device_wakeup_api/CMakeLists.txt

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+# Copyright (c) 2021 Intel Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(pm-states-test)
+
+target_sources(app PRIVATE src/main.c)

tests/subsys/pm/device_wakeup_api/boards/native_posix.overlay

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+/*
+ * Copyright (c) 2021 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&gpio0 {
+	compatible = "zephyr,gpio-emul";
+	gpio-controller;
+	wakeup-source;
+};

tests/subsys/pm/device_wakeup_api/prj.conf

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+CONFIG_ZTEST=y
+CONFIG_PM_DEVICE=y
+CONFIG_PM=y
+CONFIG_PM_POLICY_APP=y
+
+CONFIG_GPIO=y
+CONFIG_GPIO_EMUL=y

tests/subsys/pm/device_wakeup_api/src/main.c

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+/*
+ * Copyright (c) 2021 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <ztest.h>
+#include <device.h>
+#include <pm/pm.h>
+
+#define DEV_NAME DT_NODELABEL(gpio0)
+
+
+static const struct device *dev;
+static uint8_t sleep_count;
+
+
+void pm_power_state_set(struct pm_state_info info)
+{
+	ARG_UNUSED(info);
+
+	enum pm_device_state state;
+
+	switch (sleep_count) {
+	case 1:
+		/* Just  a sanity check that the system is the right state.
+		 * Devices are suspended before SoC on PM_STATE_SUSPEND_TO_RAM, that is why
+		 * we can check the device state here.
+		 */
+		zassert_equal(info.state, PM_STATE_SUSPEND_TO_RAM, "Wrong system state");
+
+		(void)pm_device_state_get(dev, &state);
+		zassert_equal(state, PM_DEVICE_STATE_SUSPENDED, "Wrong device state");
+
+		/* Enable wakeup source. Next time the system is called
+		 * to sleep, this device will still be active.
+		 */
+		(void)pm_device_wakeup_enable((struct device *)dev, true);
+		break;
+	case 2:
+		zassert_equal(info.state, PM_STATE_SUSPEND_TO_RAM, "Wrong system state");
+
+		/* Second time this function is called, the system is asked to standby
+		 * and devices were suspended.
+		 */
+		(void)pm_device_state_get(dev, &state);
+		zassert_equal(state, PM_DEVICE_STATE_ACTIVE, "Wrong device state");
+		break;
+	default:
+		break;
+	}
+}
+
+void pm_power_state_exit_post_ops(struct pm_state_info info)
+{
+	irq_unlock(0);
+}
+
+struct pm_state_info pm_policy_next_state(int32_t ticks)
+{
+	while (sleep_count < 3) {
+		sleep_count++;
+		return (struct pm_state_info){PM_STATE_SUSPEND_TO_RAM, 0, 0, 0};
+	}
+
+	return (struct pm_state_info){PM_STATE_ACTIVE, 0, 0, 0};
+}
+
+void test_wakeup_device_api(void)
+{
+	bool ret = false;
+
+	dev = DEVICE_DT_GET(DEV_NAME);
+	zassert_not_null(dev, "Failed to get device");
+
+	ret = pm_device_wakeup_is_capable(dev);
+	zassert_true(ret, "Device marked as capable");
+
+	ret = pm_device_wakeup_enable((struct device *)dev, true);
+	zassert_true(ret, "Could not enable wakeup source");
+
+	ret = pm_device_wakeup_is_enabled(dev);
+	zassert_true(ret, "Wakeup source not enabled");
+
+	ret = pm_device_wakeup_enable((struct device *)dev, false);
+	zassert_true(ret, "Could not disable wakeup source");
+
+	ret = pm_device_wakeup_is_enabled(dev);
+	zassert_false(ret, "Wakeup source is enabled");
+}
+
+void test_wakeup_device_system_pm(void)
+{
+	/*
+	 * Trigger system PM. The policy manager will return
+	 * PM_STATE_SUSPEND_TO_RAM and then the PM subsystem will
+	 * suspend all devices. As gpio is wakeup capability is not
+	 * enabled, the device will be suspended.  This will be
+	 * confirmed in pm_power_state_set().
+	 *
+	 * As the native posix implementation does not properly sleeps,
+	 * the idle thread will call several times the PM subsystem. This
+	 * test workaround this problem keeping track of the calls using
+	 * the sleep_count variable.
+	 */
+	k_sleep(K_SECONDS(1));
+}
+
+void test_main(void)
+{
+	ztest_test_suite(wakeup_device_test,
+			 ztest_1cpu_unit_test(test_wakeup_device_api),
+			 ztest_1cpu_unit_test(test_wakeup_device_system_pm)
+		);
+	ztest_run_test_suite(wakeup_device_test);
+}

tests/subsys/pm/device_wakeup_api/testcase.yaml

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+tests:
+  pm-device-wakeup-api.dts:
+    tags: power
+    platform_allow: native_posix