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151 lines
3.6 KiB
C++
151 lines
3.6 KiB
C++
/*
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* \brief GPIO-session component
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* \author Stefan Kalkowski
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* \date 2013-05-03
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*/
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/*
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* Copyright (C) 2011-2015 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__COMPONENT_H_
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#define _INCLUDE__GPIO__COMPONENT_H_
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#include <base/printf.h>
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#include <root/component.h>
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#include <gpio_session/gpio_session.h>
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#include <gpio/driver.h>
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namespace Gpio {
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class Session_component;
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class Root;
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};
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class Gpio::Session_component : public Genode::Rpc_object<Gpio::Session>
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{
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private:
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struct Irq_session_component : public Genode::Rpc_object<Genode::Irq_session>
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{
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Driver &_driver;
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unsigned long _pin;
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Irq_session_component(Driver &driver, unsigned long pin)
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: _driver(driver), _pin(pin) { }
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/***************************
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** Irq_session interface **
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***************************/
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void ack_irq() override { _driver.ack_irq(_pin); }
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void sigh(Genode::Signal_context_capability sigh) override {
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_driver.register_signal(_pin, sigh); }
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Info info() override {
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return { .type = Genode::Irq_session::Info::Type::INVALID }; }
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};
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Genode::Rpc_entrypoint &_ep;
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Driver &_driver;
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unsigned long _pin;
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Irq_session_component _irq_component;
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Genode::Irq_session_capability _irq_cap;
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public:
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Session_component(Genode::Rpc_entrypoint &ep,
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Driver &driver,
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unsigned long gpio_pin)
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: _ep(ep), _driver(driver), _pin(gpio_pin),
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_irq_component(_driver, _pin),
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_irq_cap(_ep.manage(&_irq_component)) { }
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~Session_component() { _ep.dissolve(&_irq_component); }
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/*****************************
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** Gpio::Session interface **
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*****************************/
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void direction(Direction d) { _driver.direction(_pin, (d == IN)); }
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void write(bool level) { _driver.write(_pin, level); }
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bool read() { return _driver.read(_pin); }
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void debouncing(unsigned int us)
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{
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if (us) {
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_driver.debounce_time(_pin, us);
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_driver.debounce_enable(_pin, true);
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} else
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_driver.debounce_enable(_pin, false);
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}
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Genode::Irq_session_capability irq_session(Irq_type type)
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{
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switch (type) {
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case HIGH_LEVEL:
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_driver.high_detect(_pin);
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break;
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case LOW_LEVEL:
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_driver.low_detect(_pin);
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break;
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case RISING_EDGE:
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_driver.rising_detect(_pin);
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break;
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case FALLING_EDGE:
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_driver.falling_detect(_pin);
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};
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_driver.irq_enable(_pin, true);
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return _irq_cap;
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}
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};
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class Gpio::Root : public Genode::Root_component<Gpio::Session_component>
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{
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private:
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Genode::Rpc_entrypoint &_ep;
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Driver &_driver;
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protected:
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Session_component *_create_session(const char *args)
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{
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unsigned long pin =
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Genode::Arg_string::find_arg(args, "gpio").ulong_value(0);
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Genode::size_t ram_quota =
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Genode::Arg_string::find_arg(args, "ram_quota").ulong_value(0);
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if (!_driver.gpio_valid(pin))
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throw Invalid_args();
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if (ram_quota < sizeof(Session_component)) {
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PWRN("Insufficient dontated ram_quota (%zd bytes), require %zd bytes",
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ram_quota, sizeof(Session_component));
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throw Genode::Root::Quota_exceeded();
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}
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return new (md_alloc()) Session_component(_ep, _driver, pin);
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}
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public:
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Root(Genode::Rpc_entrypoint *session_ep,
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Genode::Allocator *md_alloc, Driver &driver)
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: Genode::Root_component<Gpio::Session_component>(session_ep, md_alloc),
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_ep(*session_ep), _driver(driver) { }
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};
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#endif /* _INCLUDE__GPIO__COMPONENT_H_ */
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