evdevpp: Add C++ bindings for libevdev
Change-Id: Iff27168588ee0767902801e6df3c6745a643ac9a
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/configure.ac b/configure.ac
index e9b8065..b7842fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,6 +30,8 @@
[AC_MSG_ERROR([Could not find systemd...systemd developement package required])])
PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces], ,
[AC_MSG_ERROR([Could not find phosphor-dbus-interfaces...openbmc/phosphor-dbus-interfaces package required])])
+PKG_CHECK_MODULES([LIBEVDEV], [libevdev], ,
+[AC_MSG_ERROR([The libevdev package is required])])
# Checks for library functions.
LT_INIT # Required for systemd linking
@@ -132,8 +134,6 @@
])
AS_IF([test "x$enable_cooling_type" != "xno"], [
- PKG_CHECK_MODULES([LIBEVDEV], [libevdev], ,
- [AC_MSG_ERROR([The libevdev package is required])])
AC_CONFIG_FILES([cooling-type/Makefile])
])
AS_IF([test "x$enable_monitor" != "xno"], [
diff --git a/evdevpp/evdev.hpp b/evdevpp/evdev.hpp
new file mode 100644
index 0000000..1861982
--- /dev/null
+++ b/evdevpp/evdev.hpp
@@ -0,0 +1,127 @@
+#pragma once
+
+#include <fcntl.h>
+#include <libevdev/libevdev.h>
+#include <memory>
+#include <phosphor-logging/elog.hpp>
+#include <phosphor-logging/elog-errors.hpp>
+#include <string>
+#include <tuple>
+#include <unistd.h>
+#include <xyz/openbmc_project/Common/error.hpp>
+
+namespace evdevpp
+{
+namespace evdev
+{
+
+using EvDevPtr = libevdev*;
+
+namespace details
+{
+
+/** @brief unique_ptr functor to release an evdev reference. */
+struct EvDevDeleter
+{
+ void operator()(libevdev* ptr) const
+ {
+ deleter(ptr);
+ }
+
+ decltype(&libevdev_free) deleter = libevdev_free;
+};
+
+/* @brief Alias evdev to a unique_ptr type for auto-release. */
+using EvDev = std::unique_ptr<libevdev, EvDevDeleter>;
+
+} // namespace details
+
+/** @class EvDev
+ * @brief Provides C++ bindings to the libevdev C API.
+ */
+class EvDev
+{
+ private:
+ using InternalFailure = sdbusplus::xyz::openbmc_project::Common::
+ Error::InternalFailure;
+
+ public:
+ /* Define all of the basic class operations:
+ * Not allowed:
+ * - Default constructor to avoid nullptrs.
+ * - Copy operations due to internal unique_ptr.
+ * Allowed:
+ * - Move operations.
+ * - Destructor.
+ */
+ EvDev() = delete;
+ EvDev(const EvDev&) = delete;
+ EvDev& operator=(const EvDev&) = delete;
+ EvDev(EvDev&&) = default;
+ EvDev& operator=(EvDev&&) = default;
+ ~EvDev() = default;
+
+ /** @brief Conversion constructor from evdev. */
+ explicit EvDev(EvDevPtr ptr) : evdev(ptr) {}
+
+ /** @brief Get the current event state. */
+ auto fetch(unsigned int type, unsigned int code)
+ {
+ int val;
+ auto rc = libevdev_fetch_event_value(
+ evdev.get(), type, code, &val);
+ if (!rc)
+ {
+ phosphor::logging::elog<InternalFailure>();
+ }
+
+ return val;
+ }
+
+ /** @brief Get the next event. */
+ auto next()
+ {
+ struct input_event ev;
+ while (true)
+ {
+ auto rc = libevdev_next_event(
+ evdev.get(), LIBEVDEV_READ_FLAG_NORMAL, &ev);
+ if (rc < 0)
+ {
+ phosphor::logging::elog<InternalFailure>();
+ }
+
+ if (ev.type == EV_SYN && ev.code == SYN_REPORT)
+ continue;
+
+ break;
+ }
+ return std::make_tuple(ev.type, ev.code, ev.value);
+ }
+
+ private:
+ EvDevPtr get()
+ {
+ return evdev.get();
+ }
+
+ details::EvDev evdev;
+};
+
+inline auto newFromFD(int fd)
+{
+ using InternalFailure = sdbusplus::xyz::openbmc_project::Common::
+ Error::InternalFailure;
+
+ EvDevPtr dev = nullptr;
+ auto rc = libevdev_new_from_fd(fd, &dev);
+
+ if (rc)
+ {
+ phosphor::logging::elog<InternalFailure>();
+ }
+
+ return EvDev(dev);
+}
+} // namespace evdev
+} // namespace evdevpp
diff --git a/presence/Makefile.am b/presence/Makefile.am
index 0f7e7dd..c3c32a5 100644
--- a/presence/Makefile.am
+++ b/presence/Makefile.am
@@ -15,11 +15,13 @@
$(top_builddir)/libfan.la \
$(SDBUSPLUS_LIBS) \
$(PHOSPHOR_LOGGING_LIBS) \
- ${PHOSPHOR_DBUS_INTERFACES_LIBS}
+ ${PHOSPHOR_DBUS_INTERFACES_LIBS} \
+ $(LIBEVDEV_LIBS)
phosphor_fan_presence_tach_CXXFLAGS = \
$(SDBUSPLUS_CFLAGS) \
$(PHOSPHOR_LOGGING_CFLAGS) \
- ${PHOSPHOR_DBUS_INTERFACES_CFLAGS}
+ ${PHOSPHOR_DBUS_INTERFACES_CFLAGS} \
+ $(LIBEVDEV_CFLAGS)
BUILT_SOURCES = fan_detect_defs.cpp