DeviceServer.cpp

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "LogLevelFile.h"
#include "DeviceServer.h"
 
DeviceServer::DeviceServer(const char *path)
    : FileSystemServer(new Directory(1), path)
{
}
 
DeviceServer::~DeviceServer()
{
}
 
FileSystem::Result DeviceServer::initialize()
{
    // Initialize all devices
    for (Size i = 0; i < m_devices.count(); i++)
    {
        Device *dev = m_devices[i];
        if (dev != ZERO)
        {
            const FileSystem::Result result = dev->initialize();
            if (result != FileSystem::Success)
            {
                ERROR("failed to initialize device " << (*dev->getIdentifier()) <<
                      ": result = " << (int)result);
                return result;
            }
        }
    }
 
    // Add log level pseudo file
    const FileSystem::Result logResult = registerFile(new LogLevelFile(getNextInode()), "loglevel");
    if (logResult != FileSystem::Success)
    {
        ERROR("failed to register LogLevelFile: result = " << (int) logResult);
        return logResult;
    }
 
    // Mount on the root file system
    const FileSystem::Result result = mount();
    if (result != FileSystem::Success)
    {
        ERROR("failed to mount to path " << m_mountPath << ": result = " << (int)result);
        return result;
    }
 
    return FileSystem::Success;
}
 
void DeviceServer::registerDevice(Device *dev, const char *path)
{
    FileSystemServer::registerFile(dev, path);
 
    // Add to the list of Devices
    const bool result = m_devices.insert(dev);
    if (!result)
    {
        FATAL("failed to register device on path: " << path);
    }
}
 
void DeviceServer::registerInterrupt(Device *dev, Size vector)
{
    if (!m_interrupts.get(vector))
    {
        m_interrupts.insertAt(vector, new List<Device *>);
    }
    m_interrupts[vector]->append(dev);
 
    // Register to kernel
    const API::Result watchResult = ProcessCtl(SELF, WatchIRQ, vector);
    if (watchResult != API::Success)
    {
        ERROR("failed to register IRQ handler using WatchIRQ: result = " << (int) watchResult);
        return;
    }
 
    const API::Result enableResult = ProcessCtl(SELF, EnableIRQ, vector);
    if (enableResult != API::Success)
    {
        ERROR("failed to enable IRQ handler using EnableIRQ: result = " << (int) enableResult);
        return;
    }
 
    // Register interrupt handler
    addIRQHandler(vector, (IRQHandlerFunction) &DeviceServer::interruptHandler);
}
 
void DeviceServer::interruptHandler(Size vector)
{
    List<Device *> *lst = m_interrupts.get(vector);
 
    // Do we have any Devices with this interrupt vector?
    if (lst)
    {
        // Loop all Devices of interest. Invoke callback.
        for (ListIterator<Device *> i(lst); i.hasCurrent(); i++)
        {
            i.current()->interrupt(vector);
        }
    }
 
    // Keep retrying any pending requests, if any
    retryAllRequests();
}