Update Opie Documentation

1 files changed, 60 insertions, 4 deletions

diff --git a/libopie2/opiecore/device/odevice.cpp b/libopie2/opiecore/device/odevice.cpp
index 2b10034..ec861ee 100644
--- a/libopie2/opiecore/device/odevice.cpp
+++ b/libopie2/opiecore/device/odevice.cpp
@@ -1,794 +1,850 @@
 /*
                              This file is part of the Opie Project
                              Copyright (C) The Opie Team <opie-devel@handhelds.org>
               =.
             .=l.
            .>+-=
  _;:,     .>    :=|.         This program is free software; you can
 .> <`_,   >  .   <=          redistribute it and/or  modify it under
 :`=1 )Y*s>-.--   :           the terms of the GNU Library General Public
 .="- .-=="i,     .._         License as published by the Free Software
  - .   .-<_>     .<>         Foundation; either version 2 of the License,
      ._= =}       :          or (at your option) any later version.
     .%`+i>       _;_.
     .i_,=:_.      -<s.       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
 ..}^=.=       =       ;      Library General Public License for more
 ++=   -.     .`     .:       details.
  :     =  ...= . :.=-
  -.   .:....=;==+<;          You should have received a copy of the GNU
   -_. . .   )=.  =           Library General Public License along with
     --        :-=`           this library; see the file COPYING.LIB.
                              If not, write to the Free Software Foundation,
                              Inc., 59 Temple Place - Suite 330,
                              Boston, MA 02111-1307, USA.
 */
 
 #include "odevice_beagle.h"
 #include "odevice_ipaq.h"
 #include "odevice_jornada.h"
 #include "odevice_ramses.h"
 #include "odevice_simpad.h"
 #include "odevice_yopy.h"
 #include "odevice_zaurus.h"
 
 /* QT */
 #include <qapplication.h>
 #include <qfile.h>
 #include <qtextstream.h>
 #include <qwindowsystem_qws.h>
 
 /* OPIE */
 #include <qpe/config.h>
 #include <qpe/resource.h>
 #include <qpe/sound.h>
 #include <qpe/qcopenvelope_qws.h>
 #include <qpe/sound.h>
 #include <opie2/okeyfilter.h>
 
 /* STD */
 #include <fcntl.h>
 #include <math.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <sys/ioctl.h>
 #include <sys/time.h>
 #include <unistd.h>
 #ifndef QT_NO_SOUND
 #include <linux/soundcard.h>
 #endif
 
 namespace Opie {
 namespace Core {
 
 static const char* PATH_PROC_CPUINFO = "/proc/cpuinfo";
 
 
 /* STATIC and common implementation */
 /* EXPORT */ ODistribution distributions[] = {
     { System_Familiar,        "FamiliarLinux",   "/etc/familiar-version" },
     { System_OpenZaurus,      "OpenZaurus",      "/etc/oz_version" },
     { System_OpenEmbedded,    "OpenEmbedded",    "/etc/oe-version" },
     { System_Unknown,         "Linux",           "/etc/issue" },
 };
 
 
 /* EXPORT */ bool isQWS(){
     return qApp ? ( qApp->type() == QApplication::GuiServer ) : false;
 }
 
 /* EXPORT */ QCString makeChannel ( const char *str ){
     if ( str && !::strchr ( str, '/' ))
         return QCString ( "QPE/Application/" ) + str;
     else
         return str;
 }
 
 
 
 /* Now the default implementation of ODevice */
 
 struct default_button default_buttons [] =  {
     { Qt::Key_F9, QT_TRANSLATE_NOOP("Button", "Calendar Button"),
     "devicebuttons/z_calendar",
     "datebook", "nextView()",
     "today", "raise()" },
     { Qt::Key_F10, QT_TRANSLATE_NOOP("Button", "Contacts Button"),
     "devicebuttons/z_contact",
     "addressbook", "raise()",
     "addressbook", "beamBusinessCard()" },
     { Qt::Key_F12, QT_TRANSLATE_NOOP("Button", "Home Button"),
     "devicebuttons/z_home",
     "QPE/Launcher", "home()",
     "buttonsettings", "raise()" },
     { Qt::Key_F11, QT_TRANSLATE_NOOP("Button", "Menu Button"),
     "devicebuttons/z_menu",
     "QPE/TaskBar", "toggleMenu()",
     "QPE/TaskBar", "toggleStartMenu()" },
     { Qt::Key_F13, QT_TRANSLATE_NOOP("Button", "Mail Button"),
     "devicebuttons/z_mail",
     "opiemail", "raise()",
     "opiemail", "newMail()" },
 };
 
 ODevice *ODevice::inst()
 {
     static ODevice *dev = 0;
 
     // rewrite this to only use /proc/cpuinfo or so
     QString cpu_info;
 
     if ( !dev )
     {
         QFile f( PATH_PROC_CPUINFO );
         if ( f.open( IO_ReadOnly ) )
         {
             QTextStream s( &f );
             while ( !s.atEnd() )
             {
                 QString line;
                 line = s.readLine();
                 if ( line.startsWith( "Hardware" ) )
                 {
                     qDebug( "ODevice() - found '%s'", (const char*) line );
                     cpu_info = line;
                     if ( line.contains( "sharp", false ) ) dev = new Internal::Zaurus();
                     else if ( line.contains( "ipaq", false ) ) dev = new Internal::iPAQ();
                     else if ( line.contains( "simpad", false ) ) dev = new Internal::SIMpad();
                     else if ( line.contains( "jornada", false ) ) dev = new Internal::Jornada();
                     else if ( line.contains( "ramses", false ) ) dev = new Internal::Ramses();
                     else if ( line.contains( "Tradesquare.NL", false ) ) dev = new Internal::Beagle();
                     else qWarning( "ODevice() - unknown hardware - using default." );
                     break;
                 }
             }
         }
         else
         {
             qWarning( "ODevice() - can't open '%s' - unknown hardware - using default.", PATH_PROC_CPUINFO );
         }
         if ( !dev ) dev = new ODevice();
         dev->init(cpu_info);
     }
     return dev;
 }
 
 ODevice::ODevice()
 {
     d = new ODeviceData;
 
     d->m_modelstr = "Unknown";
     d->m_model = Model_Unknown;
     d->m_vendorstr = "Unknown";
     d->m_vendor = Vendor_Unknown;
     d->m_systemstr = "Unknown";
     d->m_system = System_Unknown;
     d->m_sysverstr = "0.0";
     d->m_rotation = Rot0;
     d->m_direction = CW;
 
     d->m_holdtime = 1000; // 1000ms
     d->m_buttons = 0;
     d->m_cpu_frequencies = new QStrList;
 
 
     /* mixer */
     d->m_sound = d->m_vol   = d->m_mixer = -1;
 
     // New distribution detection code first checks for legacy distributions,
     // identified by /etc/familiar-version or /etc/oz_version.
     // Then check for OpenEmbedded and lastly, read /etc/issue
 
     for ( unsigned int i = 0; i < sizeof distributions; ++i )
     {
         if ( QFile::exists( distributions[i].sysvfile ) )
         {
             d->m_systemstr = distributions[i].sysstr;
             d->m_system = distributions[i].system;
             d->m_sysverstr = "<Unknown>";
             QFile f( distributions[i].sysvfile );
             if ( f.open( IO_ReadOnly ) )
             {
                 QTextStream ts( &f );
                 d->m_sysverstr = ts.readLine().replace( QRegExp( "\\\\." ), "" );
             }
             break;
         }
     }
 }
 
 void ODevice::systemMessage( const QCString &msg, const QByteArray & )
 {
     if ( msg == "deviceButtonMappingChanged()" ) {
         reloadButtonMapping();
     }
 }
 
 void ODevice::init(const QString&)
 {
 }
 
 /**
 * This method initialises the button mapping
 */
 void ODevice::initButtons()
 {
     if ( d->m_buttons )
         return;
 
     qDebug ( "init Buttons" );
     d->m_buttons = new QValueList <ODeviceButton>;
     for ( uint i = 0; i < ( sizeof( default_buttons ) / sizeof( default_button )); i++ ) {
         default_button *db = default_buttons + i;
         ODeviceButton b;
         b. setKeycode ( db->code );
         b. setUserText ( QObject::tr ( "Button", db->utext ));
         b. setPixmap ( Resource::loadPixmap ( db->pix ));
         b. setFactoryPresetPressedAction ( OQCopMessage ( makeChannel ( db->fpressedservice ), db->fpressedaction ));
         b. setFactoryPresetHeldAction ( OQCopMessage ( makeChannel ( db->fheldservice ), db->fheldaction ));
         d->m_buttons->append ( b );
     }
 
     reloadButtonMapping();
 
     QCopChannel *sysch = new QCopChannel ( "QPE/System", this );
     connect ( sysch, SIGNAL( received(const QCString&,const QByteArray&)), this, SLOT( systemMessage(const QCString&,const QByteArray&)));
 }
 
 ODevice::~ODevice()
 {
 // we leak m_devicebuttons and m_cpu_frequency
 // but it's a singleton and it is not so importantant
 // -zecke
     delete d;
 }
 
 bool ODevice::setSoftSuspend ( bool /*soft*/ )
 {
     return false;
 }
 
 //#include <linux/apm_bios.h>
 
 #define APM_IOC_SUSPEND          OD_IO( 'A', 2 )
 
 /**
 * This method will try to suspend the device
 * It only works if the user is the QWS Server and the apm application
 * is installed.
 * It tries to suspend and then waits some time cause some distributions
 * do have asynchronus apm implementations.
 * This method will either fail and return false or it'll suspend the
 * device and return once the device got woken up
 *
 * @return if the device got suspended
 */
 bool ODevice::suspend()
 {
     if ( !isQWS( ) ) // only qwsserver is allowed to suspend
         return false;
 
     if ( d->m_model == Model_Unknown ) // better don't suspend in qvfb / on unkown devices
         return false;
 
     bool res = false;
     ODevice::sendSuspendmsg();
 
     struct timeval tvs, tvn;
     ::gettimeofday ( &tvs, 0 );
 
     ::sync(); // flush fs caches
     res = ( ::system ( "apm --suspend" ) == 0 );
 
     // This is needed because the iPAQ apm implementation is asynchronous and we
     // can not be sure when exactly the device is really suspended
     // This can be deleted as soon as a stable familiar with a synchronous apm implementation exists.
 
     if ( res ) {
         do { // wait at most 1.5 sec: either suspend didn't work or the device resumed
             ::usleep ( 200 * 1000 );
             ::gettimeofday ( &tvn, 0 );
         } while ((( tvn. tv_sec - tvs. tv_sec ) * 1000 + ( tvn. tv_usec - tvs. tv_usec ) / 1000 ) < 1500 );
     }
 
     return res;
 }
 
 //#include <linux/fb.h> better not rely on kernel headers in userspace ...
 
 #define FBIOBLANK             OD_IO( 'F', 0x11 ) // 0x4611
 
 /* VESA Blanking Levels */
 #define VESA_NO_BLANKING      0
 #define VESA_VSYNC_SUSPEND    1
 #define VESA_HSYNC_SUSPEND    2
 #define VESA_POWERDOWN        3
 
 /**
 * This sets the display on or off
 */
 bool ODevice::setDisplayStatus ( bool on )
 {
     qDebug("ODevice::setDisplayStatus(%d)", on);
 
     if ( d->m_model == Model_Unknown )
         return false;
 
     bool res = false;
     int fd;
 
 #ifdef QT_QWS_DEVFS
     if (( fd = ::open ( "/dev/fb/0", O_RDWR )) >= 0 ) {
 #else
     if (( fd = ::open ( "/dev/fb0", O_RDWR )) >= 0 ) {
 #endif
         res = ( ::ioctl ( fd, FBIOBLANK, on ? VESA_NO_BLANKING : VESA_POWERDOWN ) == 0 );
         ::close ( fd );
     }
     return res;
 }
 
 /**
 * This sets the display brightness
 *
 * @param p The brightness to be set on a scale from 0 to 255
 * @return success or failure
 */
 bool ODevice::setDisplayBrightness ( int p)
 {
         Q_UNUSED( p )
     return false;
 }
 
 /**
-* @return returns the number of steppings on the brightness slider
-* in the Light-'n-Power settings.
-*/
+ * 
+ * @return Returns the number of steppings on the brightness slider
+ * in the Light-'n-Power settings. Values smaller zero and bigger
+ * than 255 do not make sense.
+ *
+ * \sa QSlider::setLineStep
+ * \sa QSlider::setPageStep
+ */
 int ODevice::displayBrightnessResolution() const
 {
     return 16;
 }
 
 /**
 * This sets the display contrast
 * @param p The contrast to be set on a scale from 0 to 255
 * @return success or failure
 */
 bool ODevice::setDisplayContrast ( int p)
 {
         Q_UNUSED( p )
     return false;
 }
 
 /**
 * @return return the max value for the brightness settings slider
 *         or 0 if the device doesn't support setting of a contrast
 */
 int ODevice::displayContrastResolution() const
 {
     return 0;
 }
 
 /**
 * This returns the vendor as string
 * @return Vendor as QString
 */
 QString ODevice::vendorString() const
 {
     return d->m_vendorstr;
 }
 
 /**
 * This returns the vendor as one of the values of OVendor
 * @return OVendor
 */
 OVendor ODevice::vendor() const
 {
     return d->m_vendor;
 }
 
 /**
 * This returns the model as a string
 * @return A string representing the model
 */
 QString ODevice::modelString() const
 {
     return d->m_modelstr;
 }
 
 /**
 * This does return the OModel used
 */
 OModel ODevice::model() const
 {
     return d->m_model;
 }
 
 /**
 * This does return the systen name
 */
 QString ODevice::systemString() const
 {
     return d->m_systemstr;
 }
 
 /**
 * Return System as OSystem value
 */
 OSystem ODevice::system() const
 {
     return d->m_system;
 }
 
 /**
 * @return the version string of the base system
 */
 QString ODevice::systemVersionString() const
 {
     return d->m_sysverstr;
 }
 
 /**
 *  @return the current Transformation
 */
 Transformation ODevice::rotation() const
 {
     return d->m_rotation;
 }
 
 /**
 *  @return the current rotation direction
 */
 ODirection ODevice::direction() const
 {
     return d->m_direction;
 }
 
 /**
 * This plays an alarm sound
 */
 void ODevice::playAlarmSound()
 {
 #ifndef QT_NO_SOUND
     static Sound snd ( "alarm" );
 
     if ( snd. isFinished())
         snd. play();
 #endif
 }
 
 /**
 * This plays a key sound
 */
 void ODevice::playKeySound()
 {
 #ifndef QT_NO_SOUND
     static Sound snd ( "keysound" );
 
     if ( snd. isFinished())
         snd. play();
 #endif
 }
 
 /**
 * This plays a touch sound
 */
 void ODevice::playTouchSound()
 {
 #ifndef QT_NO_SOUND
     static Sound snd ( "touchsound" );
 
     if ( snd. isFinished())
         snd. play();
 #endif
 }
 
 /**
 * This method will return a list of leds
 * available on this device
 * @return a list of LEDs.
 */
 QValueList <OLed> ODevice::ledList() const
 {
     return QValueList <OLed>();
 }
 
 /**
 * This does return the state of the LEDs
 */
 QValueList <OLedState> ODevice::ledStateList ( OLed /*which*/ ) const
 {
     return QValueList <OLedState>();
 }
 
 /**
 * @return the state for a given OLed
 */
 OLedState ODevice::ledState ( OLed /*which*/ ) const
 {
     return Led_Off;
 }
 
 /**
 * Set the state for a LED
 * @param which Which OLed to use
 * @param st The state to set
 * @return success or failure
 */
 bool ODevice::setLedState ( OLed which, OLedState st )
 {
         Q_UNUSED( which )
         Q_UNUSED( st    )
     return false;
 }
 
 /**
 * @return if the device has a light sensor
 */
 bool ODevice::hasLightSensor() const
 {
     return false;
 }
 
 /**
 * @return a value from the light sensor
 */
 int ODevice::readLightSensor()
 {
     return -1;
 }
 
 /**
 * @return the light sensor resolution
 */
 int ODevice::lightSensorResolution() const
 {
     return 0;
 }
 
 /**
 * @return if the device has a hinge sensor
 */
 bool ODevice::hasHingeSensor() const
 {
     return false;
 }
 
 /**
 * @return a value from the hinge sensor
 */
 OHingeStatus ODevice::readHingeSensor()
 {
     return CASE_UNKNOWN;
 }
 
 /**
 * @return a list with CPU frequencies supported by the hardware
 */
 const QStrList &ODevice::allowedCpuFrequencies() const
 {
     return *d->m_cpu_frequencies;
 }
 
 
 /**
 * Set desired CPU frequency
 *
 * @param index index into d->m_cpu_frequencies of the frequency to be set
 */
 bool ODevice::setCurrentCpuFrequency(uint index)
 {
     if (index >= d->m_cpu_frequencies->count())
         return false;
 
     char *freq = d->m_cpu_frequencies->at(index);
     qWarning("set freq to %s", freq);
 
     int fd;
 
     if ((fd = ::open("/proc/sys/cpu/0/speed", O_WRONLY)) >= 0) {
         char writeCommand[50];
         const int count = sprintf(writeCommand, "%s\n", freq);
         int res = (::write(fd, writeCommand, count) != -1);
         ::close(fd);
         return res;
     }
 
     return false;
 }
 
 
 /**
 * @return a list of hardware buttons
 */
 const QValueList <ODeviceButton> &ODevice::buttons()
 {
     initButtons();
 
     return *d->m_buttons;
 }
 
 /**
 * @return The amount of time that would count as a hold
 */
 uint ODevice::buttonHoldTime() const
 {
     return d->m_holdtime;
 }
 
 /**
 * This method return a ODeviceButton for a key code
 * or 0 if no special hardware button is available for the device
 *
 * @return The devicebutton or 0l
 * @see ODeviceButton
 */
 const ODeviceButton *ODevice::buttonForKeycode ( ushort code )
 {
     initButtons();
 
     for ( QValueListConstIterator<ODeviceButton> it = d->m_buttons->begin(); it != d->m_buttons->end(); ++it ) {
         if ( (*it). keycode() == code )
             return &(*it);
     }
     return 0;
 }
 
 void ODevice::reloadButtonMapping()
 {
     initButtons();
 
     Config cfg ( "ButtonSettings" );
 
     for ( uint i = 0; i < d->m_buttons->count(); i++ ) {
         ODeviceButton &b = ( *d->m_buttons ) [i];
         QString group = "Button" + QString::number ( i );
 
         QCString pch, hch;
         QCString pm, hm;
         QByteArray pdata, hdata;
 
         if ( cfg. hasGroup ( group )) {
             cfg. setGroup ( group );
             pch = cfg. readEntry ( "PressedActionChannel" ). latin1();
             pm  = cfg. readEntry ( "PressedActionMessage" ). latin1();
             // pdata = decodeBase64 ( buttonFile. readEntry ( "PressedActionArgs" ));
 
             hch = cfg. readEntry ( "HeldActionChannel" ). latin1();
             hm  = cfg. readEntry ( "HeldActionMessage" ). latin1();
             // hdata = decodeBase64 ( buttonFile. readEntry ( "HeldActionArgs" ));
         }
 
         b. setPressedAction ( OQCopMessage ( pch, pm, pdata ));
 
         b. setHeldAction ( OQCopMessage ( hch, hm, hdata ));
     }
 }
 
 void ODevice::remapPressedAction ( int button, const OQCopMessage &action )
 {
     initButtons();
 
     QString mb_chan;
 
     if ( button >= (int) d->m_buttons->count())
         return;
 
     ODeviceButton &b = ( *d->m_buttons ) [button];
         b. setPressedAction ( action );
 
     mb_chan=b. pressedAction(). channel();
 
     Config buttonFile ( "ButtonSettings" );
     buttonFile. setGroup ( "Button" + QString::number ( button ));
     buttonFile. writeEntry ( "PressedActionChannel", (const char*) mb_chan);
     buttonFile. writeEntry ( "PressedActionMessage", (const char*) b. pressedAction(). message());
 
 //  buttonFile. writeEntry ( "PressedActionArgs", encodeBase64 ( b. pressedAction(). data()));
 
     QCopEnvelope ( "QPE/System", "deviceButtonMappingChanged()" );
 }
 
 void ODevice::remapHeldAction ( int button, const OQCopMessage &action )
 {
     initButtons();
 
     if ( button >= (int) d->m_buttons->count())
         return;
 
     ODeviceButton &b = ( *d->m_buttons ) [button];
         b. setHeldAction ( action );
 
     Config buttonFile ( "ButtonSettings" );
     buttonFile. setGroup ( "Button" + QString::number ( button ));
     buttonFile. writeEntry ( "HeldActionChannel", (const char *) b. heldAction(). channel());
     buttonFile. writeEntry ( "HeldActionMessage", (const char *) b. heldAction(). message());
 
 //  buttonFile. writeEntry ( "HeldActionArgs", decodeBase64 ( b. heldAction(). data()));
 
     QCopEnvelope ( "QPE/System", "deviceButtonMappingChanged()" );
 }
+
+/**
+ * @internal
+ */
 void ODevice::virtual_hook(int, void* ){
 
 }
 
 /**
+ * \brief Send a QCOP Message before suspending
+ *
  * Sends a QCOP message to channel QPE/System
  * with the message "aboutToSuspend()" if this
- * is the windowing server
+ * is the windowing server.
+ * 
+ * Call this in your custom \sa suspend() Method
+ * before going to suspend.
+ * 
  */
 void ODevice::sendSuspendmsg()
 {
     if ( isQWS() )
         return;
 
     QCopEnvelope ( "QPE/System", "aboutToSuspend()" );
 }
 
 /**
  * \brief Prepend the QWSServer::KeyboardFilter to the list of installed KeyFilters
  *
  * Prepend a QWSServer::KeyboardFilter to the List of Keyboard
  * Filters. This function is the only way to prepend a KeyFilter.
  *
  * @param aFilter The KeyFilter to be prepended to the list of filters
  *
  * @see Opie::Core::OKeyFilter
  * @see Opie::Core::OKeyFilter::inst()
  */
 void ODevice::addPreHandler(QWSServer::KeyboardFilter*aFilter)
 {
     Opie::Core::OKeyFilter::inst()->addPreHandler(aFilter);
 }
 
 /**
  * \brief Remove the QWSServer::KeyboardFilter in the param from the list
  *
  * Remove the QWSServer::KeyboardFilter \par aFilter from the List
  * of Keyfilters. Call this when you delete the KeyFilter!
  *
  * @param aFilter The filter to be removed from the Opie::Core::OKeyFilter
  * @see Opie::Core::ODevice::addPreHandler
  */
 void ODevice::remPreHandler(QWSServer::KeyboardFilter*aFilter)
 {
     Opie::Core::OKeyFilter::inst()->remPreHandler(aFilter);
 }
 
+
+/**
+ * @internal
+ * 
+ * @see changeMixerForAlarm
+ */
 void ODevice::playingStopped() {
     const_cast<QObject*>(sender())->disconnect( this );
 #ifndef QT_NO_SOUND
     if ( d->m_sound >= 0 ) {
         ::ioctl ( d->m_sound, MIXER_WRITE( d->m_mixer ), &d->m_vol );
         ::close ( d->m_sound );
     }
 #endif
 }
 
+
+/**
+ * \brief Change the Volume for the Alarm and set it back after playing is finished
+ *
+ * If you play an Alarm Sound you might want to change the Mixer to
+ * full volume and ignore the user setting. After it \sa Sound::isFinished
+ * you would turn the volume back to the user preference.
+ * The problem is that we used to enter the event loop while waiting
+ * for the sound to be finished triggering all kind of reentrance
+ * problems what a library shouldn't introduce.
+ * Instead of manually waiting for the sound to be finished use
+ * this Method and it will automatically restore the Mixer to
+ * the user configuration after the sound finished playing.
+ *
+ * Note: The onwership of \param snd is not transfered and playing
+ * is not started in this method. If 'snd' gets deleted before
+ * playing is finished the volume doesn't get set back to
+ * the user preference!
+ *
+ * \code
+ * static Sound snd("alarm");
+ * if(!snd.isFinished())
+ *    return;
+ *
+ * changeMixerForAlarm( my_channel, "/dev/mixer", &snd );
+ * snd.play()
+ * \endcode
+ * 
+ * 
+ *
+ * @param mixer The mixer number/channel to use
+ * @param file  The file name. If you convert from QString use QFile::encodeName
+ * @param snd   The sound to wait for finishing
+ * 
+ */
 void ODevice::changeMixerForAlarm( int mixer, const char* file, Sound *snd ) {
 #ifndef QT_NO_SOUND
     if (( d->m_sound = ::open ( file, O_RDWR )) >= 0 ) {
         if ( ::ioctl ( d->m_sound, MIXER_READ( mixer ), &d->m_vol ) >= 0 ) {
             Config cfg ( "qpe" );
             cfg. setGroup ( "Volume" );
 
             int volalarm = cfg. readNumEntry ( "AlarmPercent", 50 );
             if ( volalarm < 0 )
                 volalarm = 0;
             else if ( volalarm > 100 )
                 volalarm = 100;
             volalarm |= ( volalarm << 8 );
 
             if ( ::ioctl ( d->m_sound, MIXER_WRITE( mixer ), &volalarm ) >= 0 )
                 register_qpe_sound_finished(snd, this, SLOT(playingStopped()));
         }
         d->m_mixer = mixer;
     }
 #endif
 }
 
 }
 }