/**

  * $Id$

  *

  * OSX support functions for handling the IOKit registry. 

  * Currently this manages access to CD/DVD drives + media, plus HID devices.

  * 

  * The HID part is much simpler...

  *

  * Copyright (c) 2008 Nathan Keynes.

  *

  * 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 2 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.

  */

 #include <glib.h>

 #include <sys/param.h>

 #include <paths.h>

 #include <string.h>

 #include <unistd.h>

 #include <stdio.h>

 #include <fcntl.h>

 #include <CoreFoundation/CFRunLoop.h>

 #include <IOKit/IOMessage.h>

 #include <IOKit/hid/IOHIDLib.h>

 #include "osx_iokit.h"

 static IONotificationPortRef notify_port = 0;

 static io_iterator_t iokit_iterators[4] = {0,0,0,0};

 struct osx_cdrom_drive {

     io_string_t ioservice_path;

     io_string_t vendor_name;

     io_string_t product_name;

     char media_path[MAXPATHLEN]; // BSD device path if media present, otherwise the empty string.

     io_iterator_t media_load_iterator;

     io_iterator_t media_unload_iterator;

     int media_fh; // BSD device handle if open, otherwise -1

     media_changed_callback_t media_changed;

     void *media_changed_user_data;

 };

 static gboolean get_bsdname_for_iomedia( io_object_t iomedia, char *buf, int buflen );

 static gboolean get_boolean_property( io_object_t io, CFStringRef key, gboolean def );

 /***************** IOKit Callbacks ******************/

 /**

  * Called from IOKit for any IOMessages on an IOMedia. Currently the only message

  * we're interested in is service termination.

  */

 static void osx_cdrom_media_notify( void *ref, io_service_t service, uint32_t msgType,

                                     void *msgArgument )

 {

     if( msgType == kIOMessageServiceIsTerminated ) {

         osx_cdrom_drive_t drive = (osx_cdrom_drive_t)ref;

         if( drive->media_changed != NULL ) {

             drive->media_changed( drive, FALSE, drive->media_changed_user_data );

         }

         if( drive->media_fh != -1 ) {

             close(drive->media_fh);

             drive->media_fh = -1;

         }

         drive->media_path[0] = '\0';

         IOObjectRelease( drive->media_unload_iterator );

     }

 }

 /**

  * Called from IOKit when an IOMedia is inserted that we have be interested in.

  * FIXME: Can the matcher be restricted to descendents of the drive node? currently

  * we watch for all IOMedia events and compare the device path to see if it's one we

  * care about.

  * FIXME: We assume for now that a drive has at most one piece of media at a time. 

  * If this isn't the case, the system may get a little confused.

  */

 static void osx_cdrom_media_inserted( void *ref, io_iterator_t iterator )

 {

     osx_cdrom_drive_t drive = (osx_cdrom_drive_t)ref;

     io_object_t object;

     while( (object = IOIteratorNext(iterator)) != 0 ) {

         io_string_t iopath = "";

         IORegistryEntryGetPath( object, kIOServicePlane, iopath );

         if( drive != NULL && g_str_has_prefix(iopath, drive->ioservice_path ) &&

             get_boolean_property(object, CFSTR("Whole"), TRUE) &&

             get_bsdname_for_iomedia(object, drive->media_path, sizeof(drive->media_path)) ) {

             // A disc was inserted within the drive of interest

             if( drive->media_fh != -1 ) {

                 close(drive->media_fh);

                 drive->media_fh = -1;

             }

             if( drive->media_changed != NULL ) {

                 drive->media_changed(drive, TRUE, drive->media_changed_user_data);

             }

             // Add a notification listener to get removal events.

             IOServiceAddInterestNotification( notify_port, object, kIOGeneralInterest, 

                                               osx_cdrom_media_notify, drive, &drive->media_unload_iterator ); 

         }

         IOObjectRelease( object );

     }

 }

 static void osx_drives_changed( void *ref, io_iterator_t iterator )

 {

     io_object_t object;

     while( (object = IOIteratorNext(iterator)) != 0 ) {

         IOObjectRelease(object);

     }

 }

 /******************** Support functions *********************/

 /**

  * Determine the BSD device name (ie "/dev/rdisk1") for a given IO object.

  * @return TRUE if the device name was retrieved, FALSE if the request failed.

  */

 static gboolean get_bsdname_for_iomedia( io_object_t iomedia, char *buf, int buflen )

 {

     gboolean result = FALSE;

     CFTypeRef pathRef = IORegistryEntryCreateCFProperty(iomedia, CFSTR(kIOBSDNameKey),

             kCFAllocatorDefault, 0 );

     if( pathRef ) {

         char pathlen;

         strcpy( buf, _PATH_DEV "r" );

         pathlen = strlen(buf);

         if( CFStringGetCString( pathRef, buf + pathlen, buflen-pathlen,

                 kCFStringEncodingASCII ) != noErr ) {

             result = TRUE;

         }

         CFRelease(pathRef);

     }

     return result;

 }

 /**

  * Retrieve a boolean property from the io object, and return as a gboolean. If

  * the key is not present, return def instead.

  */

 static gboolean get_boolean_property( io_object_t io, CFStringRef key, gboolean def )

 {

     gboolean result = def;

     CFTypeRef ref = IORegistryEntryCreateCFProperty(io, key, kCFAllocatorDefault, 0 );

     if( ref ) {

     	result = CFBooleanGetValue(ref);

         CFRelease(ref);

     }

     return result;

  }

 static gboolean osx_cdrom_drive_get_name( io_object_t object, char *vendor, int vendor_len,

                                           char *product, int product_len )

 {

     gboolean result = FALSE;

     CFMutableDictionaryRef props = 0;

     if( IORegistryEntryCreateCFProperties(object, &props, kCFAllocatorDefault, kNilOptions) == KERN_SUCCESS ) {

         CFDictionaryRef dict = 

             (CFDictionaryRef)CFDictionaryGetValue(props, CFSTR(kIOPropertyDeviceCharacteristicsKey));

         if( dict != NULL ) {

             CFTypeRef value = CFDictionaryGetValue(dict, CFSTR(kIOPropertyVendorNameKey));

             if( value && CFGetTypeID(value) == CFStringGetTypeID() ) {

                 CFStringGetCString( (CFStringRef)value, vendor, vendor_len, kCFStringEncodingUTF8 );

             } else {

                 vendor[0] = 0;

             }

             value = CFDictionaryGetValue(dict, CFSTR(kIOPropertyProductNameKey));

             if ( value && CFGetTypeID(value) == CFStringGetTypeID() ) {

                 CFStringGetCString( (CFStringRef)value, product, product_len, kCFStringEncodingUTF8 );

             } else {

                 product[0] = 0;

             }

             result = TRUE;

         }

         CFRelease(props);

     }

     return result;

 }

 /**

  * Construct and initialize a new osx_cdrom_drive object, including registering

  * it's media inserted notification.

  */

 static osx_cdrom_drive_t osx_cdrom_drive_new( io_object_t device )  

 {

     osx_cdrom_drive_t drive = g_malloc0(sizeof(struct osx_cdrom_drive));

     IORegistryEntryGetPath( device, kIOServicePlane, drive->ioservice_path );

     osx_cdrom_drive_get_name( device, drive->vendor_name, sizeof(drive->vendor_name),

                               drive->product_name, sizeof(drive->product_name) );

     drive->media_path[0] = '\0';

     drive->media_changed = NULL;

     drive->media_changed_user_data = NULL;

     drive->media_fh = -1;

     IOServiceAddMatchingNotification( notify_port, kIOFirstPublishNotification, 

                                       IOServiceMatching("IOMedia"),

                                       osx_cdrom_media_inserted, drive, 

                                       &drive->media_load_iterator );

     osx_cdrom_media_inserted( drive, drive->media_load_iterator );

     return drive;

 }

 /************************ Exported functions *************************/ 

 osx_cdrom_drive_t osx_cdrom_open_drive( const char *devname )

 {

     io_object_t object = IORegistryEntryFromPath( kIOMasterPortDefault, devname );

     if( object == MACH_PORT_NULL ) {

         return NULL;

     }

     osx_cdrom_drive_t drive = osx_cdrom_drive_new( object );

     IOObjectRelease( object );

     return drive;

 }

 void osx_cdrom_set_media_changed_callback( osx_cdrom_drive_t drive, 

                                            media_changed_callback_t callback,

                                            void *user_data )

 {

     drive->media_changed = callback;

     drive->media_changed_user_data = user_data;

 }

 void osx_cdrom_close_drive( osx_cdrom_drive_t drive )

 {

     IOObjectRelease( drive->media_load_iterator );

     IOObjectRelease( drive->media_unload_iterator );

     if( drive->media_fh != -1 ) {

         close(drive->media_fh);

         drive->media_fh = -1;

     }

     g_free( drive );

 }

 int osx_cdrom_get_media_handle( osx_cdrom_drive_t drive )

 {

     if( drive->media_fh == -1 ) {

         if( drive->media_path[0] != '\0' ) {

             drive->media_fh = open( drive->media_path, O_RDONLY|O_NONBLOCK );

         }

     }

     return drive->media_fh;

 }

 void osx_cdrom_release_media_handle( osx_cdrom_drive_t drive )

 {

     if( drive->media_fh != -1 ) {

         close( drive->media_fh );

         drive->media_fh = -1; 

     }

 }

 static io_object_t iterator_find_cdrom( io_object_t iterator, find_drive_callback_t callback, void *user_data )

 {

     io_object_t object;

     while( (object = IOIteratorNext(iterator)) != 0 ) {

         io_string_t iopath = "";

         char product[256], vendor[256];

         IORegistryEntryGetPath( object, kIOServicePlane, iopath );

         osx_cdrom_drive_get_name( object, vendor, sizeof(vendor), product, sizeof(product) );

         if( callback( object, vendor, product, iopath, user_data ) ) {

             IOObjectRelease(iterator);

             return object;

         }

         IOObjectRelease(object);

     }

     IOObjectRelease(iterator);

     return 0;

 }

 /**

  * Search for a CD or DVD drive (instance of IODVDServices or IOCompactDiscServices).

  * The callback will be called repeatedly until either it returns TRUE, or all drives

  * have been iterated over.

  * 

  * @return an IO registry entry for the matched drive, or 0 if no drives matched.

  * 

  * Note: Use of IOCompactDiscServices is somewhat tentative since I don't have a Mac

  * with a CD-Rom drive.

  */ 

 io_object_t find_cdrom_drive( find_drive_callback_t callback, void *user_data )

 {

     mach_port_t master_port;

     CFMutableDictionaryRef match;

     io_iterator_t services;

     io_object_t result;

     if( IOMasterPort( MACH_PORT_NULL, &master_port ) != KERN_SUCCESS ) {

         return 0; // Failed to get the master port?

     }

     match = IOServiceMatching("IODVDServices");

     if( IOServiceGetMatchingServices(master_port, match, &services) != kIOReturnSuccess ) {

         return 0;

     }

     result = iterator_find_cdrom( services, callback, user_data );

     if( result != 0 ) {

         return result;

     }

     match = IOServiceMatching("IOCompactDiscServices");

     if( IOServiceGetMatchingServices(master_port, match, &services) != kIOReturnSuccess ) {

         return 0;

     }

     return iterator_find_cdrom( services, callback, user_data );

 }

 // *********************** Notification management ************************/

 static void osx_hid_inserted( void *ref, io_iterator_t iterator )

 {

     io_object_t object;

     while( (object = IOIteratorNext(iterator)) != 0 ) {

         io_string_t iopath = "";

         IORegistryEntryGetPath( object, kIOServicePlane, iopath );

         IOObjectRelease( object );

     }

 }

 gboolean osx_register_iokit_notifications()

 {

     notify_port = IONotificationPortCreate( kIOMasterPortDefault );

     CFRunLoopSourceRef runloop_source = IONotificationPortGetRunLoopSource( notify_port );

     CFRunLoopAddSource( CFRunLoopGetCurrent(), runloop_source, kCFRunLoopCommonModes );

     // Drive notifications

     if( IOServiceAddMatchingNotification( notify_port, kIOFirstPublishNotification,

             IOServiceMatching("IOCompactDiscServies"),

             osx_drives_changed, NULL, &iokit_iterators[0] ) != kIOReturnSuccess ) {

         ERROR( "IOServiceAddMatchingNotification failed" );

     }

     osx_drives_changed(NULL, iokit_iterators[0]);

     if( IOServiceAddMatchingNotification( notify_port, kIOFirstPublishNotification,

             IOServiceMatching("IODVDServies"),

             osx_drives_changed, NULL, &iokit_iterators[1] ) != kIOReturnSuccess ) {

         ERROR( "IOServiceAddMatchingNotification failed" );

     }

     osx_drives_changed(NULL, iokit_iterators[1]);

     if( IOServiceAddMatchingNotification( notify_port, kIOFirstPublishNotification, 

             IOServiceMatching(kIOHIDDeviceKey),

             osx_hid_inserted, NULL, &iokit_iterators[2] ) != kIOReturnSuccess ) {

         ERROR( "IOServiceAddMatchingNotification failed" );

     }

     osx_hid_inserted(NULL, iokit_iterators[2]);

     return TRUE;

 }

 void osx_unregister_iokit_notifications()

 {

     CFRunLoopSourceRef runloop_source = IONotificationPortGetRunLoopSource( notify_port );

     CFRunLoopRemoveSource( CFRunLoopGetCurrent(), runloop_source, kCFRunLoopCommonModes );

     IONotificationPortDestroy( notify_port );

     notify_port = 0;

 }