1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
new file mode 100644
index 00000000..62f3dc25
--- /dev/null
+++ b/drivers/gpio/gpio.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * GPIO -- General Purpose Input/Output
+ *
+ * Defines a simple and generic interface to access GPIO device.
+ *
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <gpio.h>
+
+/*
+ * The gpio implementation
+ */
+static const gpio_ops_t *ops;
+
+int gpio_get_direction(int gpio)
+{
+	assert(ops);
+	assert(ops->get_direction != 0);
+	assert(gpio >= 0);
+
+	return ops->get_direction(gpio);
+}
+
+void gpio_set_direction(int gpio, int direction)
+{
+	assert(ops);
+	assert(ops->set_direction != 0);
+	assert((direction == GPIO_DIR_OUT) || (direction == GPIO_DIR_IN));
+	assert(gpio >= 0);
+
+	ops->set_direction(gpio, direction);
+}
+
+int gpio_get_value(int gpio)
+{
+	assert(ops);
+	assert(ops->get_value != 0);
+	assert(gpio >= 0);
+
+	return ops->get_value(gpio);
+}
+
+void gpio_set_value(int gpio, int value)
+{
+	assert(ops);
+	assert(ops->set_value != 0);
+	assert((value == GPIO_LEVEL_LOW) || (value == GPIO_LEVEL_HIGH));
+	assert(gpio >= 0);
+
+	ops->set_value(gpio, value);
+}
+
+void gpio_set_pull(int gpio, int pull)
+{
+	assert(ops);
+	assert(ops->set_pull != 0);
+	assert((pull == GPIO_PULL_NONE) || (pull == GPIO_PULL_UP) ||
+	       (pull == GPIO_PULL_DOWN));
+	assert(gpio >= 0);
+
+	ops->set_pull(gpio, pull);
+}
+
+int gpio_get_pull(int gpio)
+{
+	assert(ops);
+	assert(ops->get_pull != 0);
+	assert(gpio >= 0);
+
+	return ops->get_pull(gpio);
+}
+
+/*
+ * Initialize the gpio. The fields in the provided gpio
+ * ops pointer must be valid.
+ */
+void gpio_init(const gpio_ops_t *ops_ptr)
+{
+	assert(ops_ptr != 0  &&
+	       (ops_ptr->get_direction != 0) &&
+	       (ops_ptr->set_direction != 0) &&
+	       (ops_ptr->get_value != 0) &&
+	       (ops_ptr->set_value != 0));
+
+	ops = ops_ptr;
+}