Revised GPIO module interface + GPIO discovery logic
* The GpioHandler class is no longer a static singleton, rather an
ordinary object with a dynamic guard against multiple instances. This
makes testing/mocking a lot easier and simplifies implementation.
* It uses a basic, mockable udev interface; the module comes with
complete unit testing of the discovery mechanism.
* Corresponding changes to user classes, including UpdateAttempter and
UpdateCheckScheduler.
Note that the implementation of the test mode signaling protocol is
currently a no-op, always returning false, and hence has no effect on
the update process yet. This mechanism will be implemented in a later
CL.
BUG=chromium-os:25397
TEST=Builds and passes unit tests (including new ones)
Change-Id: I2f6254db6799ff5ef8616314890833f6e3269ff6
Reviewed-on: https://gerrit.chromium.org/gerrit/22869
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Commit-Ready: Gilad Arnold <garnold@chromium.org>
diff --git a/gpio_handler_unittest.h b/gpio_handler_unittest.h
new file mode 100644
index 0000000..5780eaa
--- /dev/null
+++ b/gpio_handler_unittest.h
@@ -0,0 +1,31 @@
+// Copyright (c) 2012 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.
+
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_GPIO_HANDLER_UNITTEST_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_GPIO_HANDLER_UNITTEST_H__
+
+// This file contains various definitions that are shared by different mock
+// implementations that emulate GPIO behavior in the system.
+
+// Some common strings used by the different cooperating mocks for this module.
+// We use preprocessor constants to allow concatenation at compile-time.
+#define MOCK_GPIO_CHIP_ID "100"
+#define MOCK_DUTFLAGA_GPIO_ID "101"
+#define MOCK_DUTFLAGB_GPIO_ID "102"
+#define MOCK_SYSFS_PREFIX "/mock/sys/class/gpio"
+
+namespace chromeos_update_engine {
+
+// Mock GPIO identifiers, used by all mocks involved in unit testing the GPIO
+// module. These represent the GPIOs which the unit tests can cover. They should
+// generally match the GPIOs specified inside GpioHandler.
+enum MockGpioId {
+ kMockGpioIdDutflaga = 0,
+ kMockGpioIdDutflagb,
+ kMockGpioIdMax // marker, do not remove!
+};
+
+} // chromeos_update_engine
+
+#endif /* CHROMEOS_PLATFORM_UPDATE_ENGINE_GPIO_HANDLER_UNITTEST_H__ */