gpio: add gpio framework

Define the gpio ops in gpio driver.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/include/drivers/gpio.h b/include/drivers/gpio.h
new file mode 100644
index 00000000..a5cb5c7f
--- /dev/null
+++ b/include/drivers/gpio.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. 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.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * 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 HOLDER 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 __GPIO_H__
+#define __GPIO_H__
+
+#define GPIO_DIR_OUT		0
+#define GPIO_DIR_IN		1
+
+#define GPIO_LEVEL_LOW		0
+#define GPIO_LEVEL_HIGH		1
+
+typedef struct gpio_ops {
+	int (*get_direction)(int gpio);
+	void (*set_direction)(int gpio, int direction);
+	int (*get_value)(int gpio);
+	void (*set_value)(int gpio, int value);
+} gpio_ops_t;
+
+int gpio_get_direction(int gpio);
+void gpio_set_direction(int gpio, int direction);
+int gpio_get_value(int gpio);
+void gpio_set_value(int gpio, int value);
+void gpio_init(const gpio_ops_t *ops);
+
+#endif	/* __GPIO_H__ */