mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-25 00:11:07 +00:00
81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
/*
|
|
* \brief Access to GPIO driver configuration
|
|
* \author Stefan Kalkowski
|
|
* \date 2013-05-06
|
|
*
|
|
* Taken from the OMAP4 GPIO driver written by Ivan Loskutov.
|
|
*
|
|
* Configure GPIO
|
|
* Example:
|
|
* <config>
|
|
* <gpio num="123" mode="I"/>
|
|
* <gpio num="124" mode="O" value="0"/>
|
|
* </config>
|
|
*
|
|
* num - GPIO pin number
|
|
* mode - input(I) or output(O)
|
|
* value - output level (1 or 0), only for output mode
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2010-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__GPIO__CONFIG_H_
|
|
#define _INCLUDE__GPIO__CONFIG_H_
|
|
|
|
#include <base/exception.h>
|
|
#include <os/config.h>
|
|
#include <gpio/driver.h>
|
|
|
|
namespace Gpio {
|
|
|
|
class Invalid_gpio_number : Genode::Exception {};
|
|
class Invalid_mode : Genode::Exception {};
|
|
|
|
static void process_config(Gpio::Driver &driver);
|
|
}
|
|
|
|
|
|
void Gpio::process_config(Gpio::Driver &driver)
|
|
{
|
|
try {
|
|
Genode::Xml_node gpio_node = Genode::config()->xml_node().sub_node("gpio");
|
|
|
|
for (;; gpio_node = gpio_node.next("gpio")) {
|
|
unsigned num = 0;
|
|
char mode[2] = {0};
|
|
unsigned value = 0;
|
|
|
|
try {
|
|
gpio_node.attribute("num").value(&num);
|
|
if (!driver.gpio_valid(num)) throw Invalid_gpio_number();
|
|
gpio_node.attribute("mode").value(mode, sizeof(mode));
|
|
if (mode[0] == 'O' || mode[0] == 'o') {
|
|
gpio_node.attribute("value").value(&value);
|
|
driver.write(num, value);
|
|
driver.direction(num, false);
|
|
} else if (mode[0] == 'I' || mode[0] == 'i') {
|
|
driver.direction(num, true);
|
|
} else throw Invalid_mode();
|
|
|
|
PINF("gpio %d mode %s value=%d", num, mode, value);
|
|
|
|
} catch(Genode::Xml_node::Nonexistent_attribute) {
|
|
PWRN("Missing attribute. Ignore node.");
|
|
} catch(Gpio::Invalid_gpio_number) {
|
|
PWRN("Invalid GPIO number %d. Ignore node", num);
|
|
}
|
|
if (gpio_node.is_last("gpio")) break;
|
|
}
|
|
}
|
|
catch (Genode::Xml_node::Nonexistent_sub_node) {
|
|
PWRN("No GPIO config");
|
|
}
|
|
}
|
|
|
|
#endif /* _INCLUDE__GPIO__CONFIG_H_ */
|