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The new interfaces are meant to gradually replace the existing Gpio_session interface. - Each session refers to a single pin. - The session types distiguish the direction of the signal as input or output. - Pin coordinates can be selected via session labels. - GPIO interrupts are covered by the regular IRQ session interface. The interfaces are accompanied by framework utilities and interfaces: - os/pin_driver.h - pin_control_session/component.h - pin_state_session/component.h These headers relieve GPIO drivers from implementing boilerplate code by providing device-agnostic portions. The A64 pio driver serves as reference for using those utilities. https://github.com/nfeske/genode-allwinner/tree/master/src/drivers/pin/a64 Fixes #4315
71 lines
1.5 KiB
C++
71 lines
1.5 KiB
C++
/*
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* \brief Pin-state service
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* \author Norman Feske
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* \date 2021-04-20
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*/
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/*
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* Copyright (C) 2021 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__PIN_STATE_SESSION__COMPONENT_H_
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#define _INCLUDE__PIN_STATE_SESSION__COMPONENT_H_
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#include <pin_state_session/pin_state_session.h>
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#include <base/session_object.h>
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#include <os/pin_driver.h>
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namespace Pin_state {
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template <typename> class Session_component;
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template <typename ID>
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struct Root : Pin::Root<Session_component<ID>, Pin::Direction::IN>
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{
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using Pin::Root<Session_component<ID>, Pin::Direction::IN>::Root;
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};
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}
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template <typename ID>
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class Pin_state::Session_component : public Session_object<Session>
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{
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private:
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Pin::Assignment<ID> _assignment;
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public:
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using Pin_id = ID;
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Session_component(Entrypoint &ep, Resources const &resources,
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Label const &label, Diag &diag, Pin::Driver<ID> &driver)
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:
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Session_object<Session>(ep, resources, label, diag),
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_assignment(driver)
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{
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update_assignment();
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}
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/**
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* Pin_state::Session interface
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*/
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bool state() const override
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{
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if (!_assignment.target.constructed())
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return false;
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return _assignment.driver.pin_state(_assignment.target->id);
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}
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void update_assignment()
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{
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_assignment.update(label(), Pin::Direction::IN);
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}
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};
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#endif /* _INCLUDE__PIN_STATE_SESSION__COMPONENT_H_ */
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