/* * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* File: USBNotificationExample.c Description: This sample demonstrates how to use IOKitLib and IOUSBLib to set up asynchronous callbacks when a USB device is attached to or removed from the system. It also shows how to associate arbitrary data with each device instance. Copyright: © Copyright 2001 Apple Computer, Inc. All rights reserved. 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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ //================================================================================================ // Includes //================================================================================================ // #include <CoreFoundation/CoreFoundation.h> #include <IOKit/IOKitLib.h> #include <IOKit/IOMessage.h> #include <IOKit/IOCFPlugIn.h> #include <IOKit/usb/IOUSBLib.h> #include <mach/mach.h> #include <unistd.h> //================================================================================================ // Typedefs and Defines //================================================================================================ // #define kMyVendorID 1351 #define kMyProductID 8193 typedef struct MyPrivateData { io_object_t notification; IOUSBDeviceInterface245 * *deviceInterface; CFStringRef deviceName; UInt32 locationID; } MyPrivateData; //================================================================================================ // Globals //================================================================================================ // static IONotificationPortRef gNotifyPort; static io_iterator_t gAddedIter; static CFRunLoopRef gRunLoop; //================================================================================================ // // DeviceNotification // // This routine will get called whenever any kIOGeneralInterest notification happens. We are // interested in the kIOMessageServiceIsTerminated message so that's what we look for. Other // messages are defined in IOMessage.h. // //================================================================================================ // void DeviceNotification( void * refCon, io_service_t service, natural_t messageType, void * messageArgument ) { kern_return_t kr; MyPrivateData *privateDataRef = (MyPrivateData *) refCon; printf("Device 0x%08x received message 0x%x.\n", service, messageType); if (messageType == kIOMessageServiceIsTerminated) { printf("Device 0x%08x removed.\n", service); // Dump our private data to stdout just to see what it looks like. // CFShow(privateDataRef->deviceName); printf("It was at location: 0x%lx\n",privateDataRef->locationID); // Free the data we're no longer using now that the device is going away // CFRelease(privateDataRef->deviceName); if ( privateDataRef->deviceInterface ) kr = (*privateDataRef->deviceInterface)->Release (privateDataRef->deviceInterface); kr = IOObjectRelease(privateDataRef->notification); free(privateDataRef); } } //================================================================================================ // // DeviceAdded // // This routine is the callback for our IOServiceAddMatchingNotification. When we get called // we will look at all the devices that were added and we will: // // 1. Create some private data to relate to each device (in this case we use the service's name // and the location ID of the device // 2. Submit an IOServiceAddInterestNotification of type kIOGeneralInterest for this device, // using the refCon field to store a pointer to our private data. When we get called with // this interest notification, we can grab the refCon and access our private data. // //================================================================================================ // void DeviceAdded(void *refCon, io_iterator_t iterator) { kern_return_t kr; io_service_t usbDevice; IOCFPlugInInterface **plugInInterface=NULL; SInt32 score; HRESULT res; while ( (usbDevice = IOIteratorNext(iterator)) ) { io_name_t deviceName; CFStringRef deviceNameAsCFString; MyPrivateData *privateDataRef = NULL; UInt32 locationID; printf("Device 0x%08x added.\n", usbDevice); // Add some app-specific information about this device. // Create a buffer to hold the data. privateDataRef = malloc(sizeof(MyPrivateData)); bzero( privateDataRef, sizeof(MyPrivateData)); // In this sample we'll just use the service's name. // kr = IORegistryEntryGetName(usbDevice, deviceName); if (KERN_SUCCESS != kr) { deviceName[0] = '\0'; } deviceNameAsCFString = CFStringCreateWithCString(kCFAllocatorDefault, deviceName, kCFStringEncodingASCII); // Dump our data to stdout just to see what it looks like. // CFShow(deviceNameAsCFString); privateDataRef->deviceName = deviceNameAsCFString; // Now, get the locationID of this device. In order to do this, we need to create an IOUSBDeviceInterface for // our device. This will create the necessary connections between our user land application and the kernel object // for the USB Device. // kr = IOCreatePlugInInterfaceForService(usbDevice, kIOUSBDeviceUserClientTypeID, kIOCFPlugInInterfaceID, &plugInInterface, &score); if ((kIOReturnSuccess != kr) || !plugInInterface) { printf("unable to create a plugin (%08x)\n", kr); continue; } // I have the device plugin, I need the device interface // res = (*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(kIOUSBDeviceInterfaceID245), (LPVOID)&privateDataRef->deviceInterface); IODestroyPlugInInterface(plugInInterface); // done with this if (res || !privateDataRef->deviceInterface) { printf("couldn't create a device interface (%08x)\n", (int) res); continue; } // Now that we have the IOUSBDeviceInterface, we can call the routines in IOUSBLib.h // In this case, we just want the locationID. // kr = (*privateDataRef->deviceInterface)->GetLocationID(privateDataRef->deviceInterface, &locationID); if (KERN_SUCCESS != kr) { printf("GetLocationID returned %08x\n", kr); continue; } else { printf("Location ID: 0x%lx\n", locationID); } privateDataRef->locationID = locationID; // Register for an interest notification for this device. Pass the reference to our // private data as the refCon for the notification. // kr = IOServiceAddInterestNotification( gNotifyPort, // notifyPort usbDevice, // service kIOGeneralInterest, // interestType DeviceNotification, // callback privateDataRef, // refCon &(privateDataRef->notification) // notification ); if (KERN_SUCCESS != kr) { printf("IOServiceAddInterestNotification returned 0x%08x\n", kr); } // Done with this io_service_t // kr = IOObjectRelease(usbDevice); } } //================================================================================================ // // SignalHandler // // This routine will get called when we interrupt the program (usually with a Ctrl-C from the // command line). We clean up so that we don't leak. // //================================================================================================ // void SignalHandler(int sigraised) { printf("\nInterrupted\n"); // Clean up here IONotificationPortDestroy(gNotifyPort); if (gAddedIter) { IOObjectRelease(gAddedIter); gAddedIter = 0; } // exit(0) should not be called from a signal handler. Use _exit(0) instead // _exit(0); } //================================================================================================ // main //================================================================================================ // int main (int argc, const char *argv[]) { mach_port_t masterPort; CFMutableDictionaryRef matchingDict; CFRunLoopSourceRef runLoopSource; CFNumberRef numberRef; kern_return_t kr; long usbVendor = kMyVendorID; long usbProduct = kMyProductID; sig_t oldHandler; // pick up command line arguments // if (argc > 1) usbVendor = atoi(argv[1]); if (argc > 2) usbProduct = atoi(argv[2]); // Set up a signal handler so we can clean up when we're interrupted from the command line // Otherwise we stay in our run loop forever. // oldHandler = signal(SIGINT, SignalHandler); if (oldHandler == SIG_ERR) printf("Could not establish new signal handler"); // first create a master_port for my task // kr = IOMasterPort(MACH_PORT_NULL, &masterPort); if (kr || !masterPort) { printf("ERR: Couldn't create a master IOKit Port(%08x)\n", kr); return -1; } printf("Looking for devices matching vendor ID=%ld and product ID=%ld\n", usbVendor, usbProduct); // Set up the matching criteria for the devices we're interested in. The matching criteria needs to follow // the same rules as kernel drivers: mainly it needs to follow the USB Common Class Specification, pp. 6-7. // See also http://developer.apple.com/qa/qa2001/qa1076.html // One exception is that you can use the matching dictionary "as is", i.e. without adding any matching criteria // to it and it will match every IOUSBDevice in the system. IOServiceAddMatchingNotification will consume this // dictionary reference, so there is no need to release it later on. // matchingDict = IOServiceMatching(kIOUSBDeviceClassName); // Interested in instances of class // IOUSBDevice and its subclasses if (!matchingDict) { printf("Can't create a USB matching dictionary\n"); mach_port_deallocate(mach_task_self(), masterPort); return -1; } // We are interested in all USB Devices (as opposed to USB interfaces). The Common Class Specification // tells us that we need to specify the idVendor, idProduct, and bcdDevice fields, or, if we're not interested // in particular bcdDevices, just the idVendor and idProduct. Note that if we were trying to match an IOUSBInterface, // we would need to set more values in the matching dictionary (e.g. idVendor, idProduct, bInterfaceNumber and // bConfigurationValue. // // Create a CFNumber for the idVendor and set the value in the dictionary // numberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &usbVendor); CFDictionarySetValue( matchingDict, CFSTR(kUSBVendorID), numberRef); CFRelease(numberRef); // Create a CFNumber for the idProduct and set the value in the dictionary // numberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &usbProduct); CFDictionarySetValue( matchingDict, CFSTR(kUSBProductID), numberRef); CFRelease(numberRef); numberRef = 0; // Create a notification port and add its run loop event source to our run loop // This is how async notifications get set up. // gNotifyPort = IONotificationPortCreate(masterPort); runLoopSource = IONotificationPortGetRunLoopSource(gNotifyPort); gRunLoop = CFRunLoopGetCurrent(); CFRunLoopAddSource(gRunLoop, runLoopSource, kCFRunLoopDefaultMode); // Now set up a notification to be called when a device is first matched by I/O Kit. // Note that this will not catch any devices that were already plugged in so we take // care of those later. // kr = IOServiceAddMatchingNotification(gNotifyPort, // notifyPort kIOFirstMatchNotification, // notificationType matchingDict, // matching DeviceAdded, // callback NULL, // refCon &gAddedIter // notification ); // Iterate once to get already-present devices and arm the notification // DeviceAdded(NULL, gAddedIter); // Now done with the master_port mach_port_deallocate(mach_task_self(), masterPort); masterPort = 0; // Start the run loop. Now we'll receive notifications. // printf("Starting run loop.\n"); CFRunLoopRun(); // We should never get here // printf("Unexpectedly back from CFRunLoopRun()!\n"); return 0; }