Add GPIO class

This class is used for accessing a GPIO via the
/dev/gpiochipX interface.

It requests a GPIO line handle from the GPIO device to
do the actual operation on.

The GPIO number to use, for AST chips at least, is the
actual GPIO number, such as GPIOA0 = 0 and GPIOA7 = 7.

The class currently only supports writes.

Change-Id: I1c2ae38c23c5db502d5f14bcf9aa2e35094f1e9b
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/file.hpp b/file.hpp
index 9ba4cbb..ee8fd4b 100644
--- a/file.hpp
+++ b/file.hpp
@@ -15,7 +15,7 @@ class FileDescriptor
         int fd = -1;
 
     public:
-        FileDescriptor() = delete;
+        FileDescriptor() = default;
         FileDescriptor(const FileDescriptor&) = delete;
         FileDescriptor& operator=(const FileDescriptor&) = delete;
         FileDescriptor(FileDescriptor&&) = delete;
@@ -42,6 +42,16 @@ class FileDescriptor
         {
             return fd;
         }
+
+        operator bool() const
+        {
+            return fd != -1;
+        }
+
+        void set(int descriptor)
+        {
+            fd = descriptor;
+        }
 };
 
 } // namespace gpio