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81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
/*
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* \brief Access to GPIO driver configuration
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* \author Stefan Kalkowski
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* \date 2013-05-06
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*
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* Taken from the OMAP4 GPIO driver written by Ivan Loskutov.
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*
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* Configure GPIO
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* Example:
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* <config>
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* <gpio num="123" mode="I"/>
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* <gpio num="124" mode="O" value="0"/>
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* </config>
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*
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* num - GPIO pin number
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* mode - input(I) or output(O)
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* value - output level (1 or 0), only for output mode
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*/
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/*
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* Copyright (C) 2010-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__GPIO__CONFIG_H_
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#define _INCLUDE__GPIO__CONFIG_H_
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/* Genode includes */
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#include <base/exception.h>
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#include <gpio/driver.h>
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#include <util/xml_node.h>
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namespace Gpio {
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class Invalid_mode : Genode::Exception {};
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static void process_config(Genode::Xml_node const &config, Gpio::Driver &driver);
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}
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void Gpio::process_config(Genode::Xml_node const &config, Gpio::Driver &driver)
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{
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if (!config.has_sub_node("gpio"))
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Genode::warning("no GPIO config");
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config.for_each_sub_node("gpio", [&] (Genode::Xml_node const &gpio_node) {
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unsigned const num = gpio_node.attribute_value("num", 0U);
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Pin gpio { num };
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if (!driver.gpio_valid(gpio)) {
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Genode::warning("invalid GPIO number ", num, ", ignore node");
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return;
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}
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using Mode = Genode::String<2>;
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Mode const mode = gpio_node.attribute_value("mode", Mode());
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unsigned value = 0;
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if (mode == "O" || mode == "o") {
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value = gpio_node.attribute_value("value", value);
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driver.write(gpio, value);
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driver.direction(Pin {num}, false);
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}
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else if (mode == "I" || mode == "i") {
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driver.direction(Pin {num}, true);
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}
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else {
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Genode::error("gpio ", num, " has invalid mode, must be I or O");
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throw Invalid_mode();
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}
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Genode::log("gpio ", num, " mode ", mode, " value=", value);
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});
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}
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#endif /* _INCLUDE__GPIO__CONFIG_H_ */
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