Attention Handler gpio monitor
Register an async-io service for monitoring the attention GPIO and use the attention handler as the GPIO event handler. The GPIO monitor will respond to changes on the attention GPIO and in response will call the attention handler base logic to handle the attention events.
Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: I3cdc0cb34bc3067b54cb64ab49d98fa2182e7fa1
diff --git a/attn/attn_monitor.hpp b/attn/attn_monitor.hpp
new file mode 100644
index 0000000..5231d7e
--- /dev/null
+++ b/attn/attn_monitor.hpp
@@ -0,0 +1,71 @@
+#pragma once
+
+#include <gpiod.h>
+
+#include <boost/asio/io_service.hpp>
+#include <boost/asio/posix/stream_descriptor.hpp>
+
+namespace attn
+{
+
+/**
+ * @brief Responsible for monitoring attention GPIO state change
+ */
+class AttnMonitor
+{
+ public:
+ AttnMonitor() = delete;
+ ~AttnMonitor() = default;
+
+ /** @brief Constructs AttnMonitor object.
+ *
+ * The AttnMonitor constructor will create a new object and start
+ * the objects associated GPIO listener.
+ *
+ * @param line GPIO line handle
+ * @param config configuration of line
+ * @param io io service
+ */
+ AttnMonitor(gpiod_line* line, gpiod_line_request_config& config,
+ boost::asio::io_service& io) :
+ iv_gpioLine(line),
+ iv_gpioConfig(config), iv_gpioEventDescriptor(io)
+ {
+
+ requestGPIOEvent(); // registers the event handler
+ }
+
+ // delete copy constructor
+ AttnMonitor(const AttnMonitor&) = delete;
+
+ // delete assignment operator
+ AttnMonitor& operator=(const AttnMonitor&) = delete;
+
+ // delere move copy consructor
+ AttnMonitor(AttnMonitor&&) = delete;
+
+ // delete move assignment operator
+ AttnMonitor& operator=(AttnMonitor&&) = delete;
+
+ private: // instance variables
+ /** @brief gpiod handle to gpio line */
+ gpiod_line* iv_gpioLine;
+
+ /** @brief gpiod line config data */
+ gpiod_line_request_config iv_gpioConfig;
+
+ /** @brief GPIO event descriptor */
+ boost::asio::posix::stream_descriptor iv_gpioEventDescriptor;
+
+ private: // class methods
+ /** @brief schedule a gpio event handler */
+ void scheduleGPIOEvent();
+
+ /** @brief handle the GPIO event */
+ void handleGPIOEvent();
+
+ /** @brief register for a gpio event */
+ void requestGPIOEvent();
+};
+
+} // namespace attn