[dev] minimal generic gpio device api
diff --git a/include/dev/gpio.h b/include/dev/gpio.h
new file mode 100644
index 0000000..22ca9e4
--- /dev/null
+++ b/include/dev/gpio.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2008, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __DEV_GPIO_H
+#define __DEV_GPIO_H
+
+#define GPIO_INPUT 0x0000
+#define GPIO_OUTPUT 0x0001
+
+#define GPIO_LEVEL 0x0000
+#define GPIO_EDGE 0x0010
+
+#define GPIO_RISING 0x0020
+#define GPIO_FALLING 0x0040
+
+#define GPIO_HIGH 0x0020
+#define GPIO_LOW 0x0040
+
+#define GPIO_PULLUP 0x0100
+#define GPIO_PULLDOWN 0x0200
+
+int gpio_config(unsigned nr, unsigned flags);
+void gpio_set(unsigned nr, unsigned on);
+int gpio_get(unsigned nr);
+
+#endif