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ca92984bcc
Changes GPIO session interface to a one-GPIO-pin-per-session style. Moreover, this commit introduces a generic driver interface for GPIO drivers. Thereby generalizes root- and session component for GPIO.
79 lines
2.0 KiB
C++
79 lines
2.0 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) 2010-2013 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 General Public License version 2.
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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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#include <base/exception.h>
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#include <os/config.h>
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#include <gpio/driver.h>
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namespace Gpio {
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class Invalid_gpio_number : Genode::Exception {};
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class Invalid_mode : Genode::Exception {};
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static void process_config(Gpio::Driver &driver);
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}
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void Gpio::process_config(Gpio::Driver &driver) {
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try {
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Genode::Xml_node gpio_node = Genode::config()->xml_node().sub_node("gpio");
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for (;; gpio_node = gpio_node.next("gpio")) {
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unsigned num = 0;
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char mode[2] = {0};
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unsigned value = 0;
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try {
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gpio_node.attribute("num").value(&num);
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if (!driver.gpio_valid(num)) throw Invalid_gpio_number();
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gpio_node.attribute("mode").value(mode, sizeof(mode));
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if (mode[0] == 'O' || mode[0] == 'o') {
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gpio_node.attribute("value").value(&value);
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driver.write(num, value);
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driver.direction(num, false);
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} else if (mode[0] == 'I' || mode[0] == 'i') {
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driver.direction(num, true);
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} else throw Invalid_mode();
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PINF("gpio %d mode %s value=%d", num, mode, value);
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} catch(Genode::Xml_node::Nonexistent_attribute) {
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PWRN("Missing attribute. Ignore node.");
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} catch(Gpio::Invalid_gpio_number) {
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PWRN("Invalid GPIO number %d. Ignore node", num);
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}
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if (gpio_node.is_last("gpio")) break;
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}
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}
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catch (Genode::Xml_node::Nonexistent_sub_node) {
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PWRN("No GPIO config");
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}
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}
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#endif /* _INCLUDE__GPIO__CONFIG_H_ */
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