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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:13:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:13:47 +0000
commit102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch)
treebcf648efac40ca6139842707f0eba5a4496a6dd2 /drivers/gpio
parentInitial commit. (diff)
downloadarm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.tar.xz
arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.zip
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
new file mode 100644
index 0000000..76612b2
--- /dev/null
+++ b/drivers/gpio/gpio.c
@@ -0,0 +1,93 @@
+/*
+ * 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 <drivers/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;
+}