After iOS beta 2. download in iPhone 12 touch not work properly. Please fix this issue and please understand my problem. It’s a difficult problem for me. Please fix this issue as soon as possible.

The only one I can find it are some code comments in head files, would like to know any detialed workflow or sample code for it. Thanks!

Hi, does anyone know if IOUSBDeviceInterface187 and IOUSBInterfaceInterface190 interfaces will be available on application level next years and there is no any deprecation plans ? Common Recommendations are to use USBDriverKit, but is there a real need to complicate USB communication in this way?

大家好，我正在尝试制作一个关于如何检测手机屏幕前是否有物体的演示。如果有物体，屏幕将显示红色，如果没有物体，则显示绿色。这可能需要调用距离传感器，但我不知道如何调用它。希望大家能给我一个回应。谢谢。

I searched for MFi's authentication information, but did not specify the need to add an MFI chip to the USB-C interface. Have you resolved the communication issue between the APP and external USBC?

When the product of USB drive we made connected to iPhone 15, what should we set for TransportComponentName? Should we set ‘USB Connector’ for TransportComponentName? The default value is 'Lightning Connector' before. But how about the Type-C port of iPhone 15 now?

Greetings. I'm trying to build an Apple Silicon driver for a Roland keyboard which is no longer supported by the manufacturer. The most recent official driver is from 2010. From my limited understanding of the Apple documentation, it seems to be telling me that I need to build a codeless dext which overrides some sort of base class. The keyboard uses bog standard USB 1.0 to communicate with the host. Total newb in the driver area so if anyone could point me in the right direction on where to start I would be totally grateful.

Hi. I wish I'd found a way to determine the USB hub port to which an iPad is connected, even if it means creating a one-time mapping of identifiers and ports beforehand. I thought I'd find some hardware identifiers that might help, but they appear to fluctuate depending on how the iPad carts are connected to the Mac. Is there anything reliable to achieve the desired result? Thanks for your insights. Franck

Can anyone advise, or give example of, communicating large (>128 byte) incoming buffers from a dext to a user-space app? My specific situation is interrupt reads from a USB device. These return reports which are too large to fit into the asyncData field of an AsyncCompletion call. Apple's CommunicatingBetweenADriverKitExtensionAndAClientApp sample shows examples of returning a "large" struct, but the example is synchronous. The asynchronous example returns data by copying into a IOUserClientAsyncArgumentsArray, which isn't very big. I can allocate a single buffer larger than 4K in user space, and communicate that buffer to my driver as an IOMemoryDescriptor when I set up my async callback. The driver retains the descriptor, maps it into its memory space and can thus write into it when the hardware returns interrupt data. The driver then calls AsyncCompletion, which will cause my user-side callback to be called, so the user side software knows that there's new data available in the previously allocated buffer. That's fine, it works, but there are data race problems - since USB interrupt reads complete whenever the hardware has provided data, incoming completions happen at unpredictable times, so the shared buffer contents could change while the user side code is examining them. Is there an example somewhere of how to deal with this? Can I allocate memory on the driver side on demand, create an IOMemoryDescriptor for it and return that descriptor packed inside the asyncData? If so, how does the driver know when it can relinquish that memory? I have a feeling there's something here I just don't understand...

this is a repost with more appropriate tags. The original is here: https://developer.apple.com/forums/thread/744268 Can anyone advise, or give example of, communicating large (>128 byte) incoming buffers from a dext to a user-space app? My specific situation is interrupt reads from a USB device. These return reports which are too large to fit into the asyncData field of an AsyncCompletion call. Apple's CommunicatingBetweenADriverKitExtensionAndAClientApp sample shows examples of returning a "large" struct, but the example is synchronous. The asynchronous example returns data by copying into a IOUserClientAsyncArgumentsArray, which isn't very big. I can allocate a single buffer larger than 4K in user space, and communicate that buffer to my driver as an IOMemoryDescriptor when I set up my async callback. The driver retains the descriptor, maps it into its memory space and can thus write into it when the hardware returns interrupt data. The driver then calls AsyncCompletion, which will cause my user-side callback to be called, so the user side software knows that there's new data available in the previously allocated buffer. That's fine, it works, but there are data race problems - since USB interrupt reads complete whenever the hardware has provided data, incoming completions happen at unpredictable times, so the shared buffer contents could change while the user side code is examining them. Is there an example somewhere of how to deal with this? Can I allocate memory on the driver side on demand, create an IOMemoryDescriptor for it and return that descriptor packed inside the asyncData? If so, how does the driver know when it can relinquish that memory? I have a feeling there's something here I just don't understand...

I am currently in the process of developing a DEXT for a USB based external mass storage device using the USBDriverKit framework. IOUSBHostInterface is used as the provider to communicate with the interface's endpoints and I am successful in it. As per the IOUSBHostInterface documentation, To use a host interface object, call Open to create a new session between the interface and your driver. After successfully opening your session, you can request information from the interface and set up pipes to communicate with the interface's endpoints. Remember to close the session you opened in the Stop method of your driver. However, calling Open gains exclusive access to the USB interface and does not allow other services to access the interface. Also, to let go of the exclusive access, Close method can be called but in the Stop method which is called only once during the lifecycle of the extension (when the DEXT is unloaded). As a result of this, Apple's mass storage related KEXTs (media and partition related specifically) do not match the interface and so the filesystem of the drive in question does not get mounted whenever the DEXT has matched the interface. Is this exclusive access a limitation of USBDriverkit or is there any way to get around this issue in this case?

Hi. I have a class-compliant usb device which announces its serial number as m4121095, as per its kUSBSerialNumberString property. However, the file name it is provided is tty.usbmodemm41210951 – it's the serial number with an additional 1 at the end. What is the meaning of this appendage? (I'm tempted to believe that the 1 at the end is there in the unlikely case another device with the same SN is connected, but there's no way to test this possibility). In the end, I would like to obtain a filename that is guaranteed to be representing a connection to exactly this device. Can I assume that the filename of a device that follows the same protocol of serial numbering will be consistently appended with a number that can in some way be inferred? Thank you.

I am writing a C program on Mac that calls the libUSB API. However, I found some performance differences between the same programs on MAC x64 and MAC M2 systems. Program on Mac m2 call libusb_control_transfer() function is much slower than programs on Mac x64. For example, running a program on Mac x64 takes 3 seconds to complete a function, while on Mac m2 it takes 10 seconds. I try to count the number of times a program calls libusb_control_transfer() and the time it takes each time, and finally calculate the average time it takes to call libusb_control_transfer(). The following figure shows the performance of the program on Mac m2.(Unit is us per time) The following figure shows the performance of the program on Mac x64. (Unit is us per time) The difference in average time spent calling a function has reached over 10 times. Is this performance gap caused by the USB driver or the libUSB library? Thanks.

Seems like both Dropbox and Google Drive has a pretty sad implementation/bug that acquire exclusive access to USB devices that expose MTP (media transfer protocol). The way google and dropbox did it is just wrong as they 1) should ask for permission for reading data on new devices, 2) not open the usb device in exclusive mode... 3) make use of MTP's Multi-Session mode. Well, as it will take them about 4.5 years to correct this, I wonder if there is a way for a app-store/user-space application in macOS 11/12/13 (big sur, monterey, ventura) to do the following: Detect if there is another app that has exclusive lock to a specific usb device Get the name of the app so that an alert could say, "please quit google-drive for this to work..." Release the exclusive lock, i.e. hand over the usb peripheral to my application

Hi, I want to enable/disable my USB Storage stick with using MQTT server. I can connect my server, listen and publish some datas. Is it possible to do change USB status with Swift, in XCode? It should be only change storage device, because i don't want to disconnect my mouse or etc.

I am creating a macOS app that will send commands to a USB device when it is plugged into a Mac. There are only two steps to accomplish this: send request commands to the USB and receive response messages from it. The USB has an attached SCSI, but I am unsure of how to send SCSI commands to macOS. Research has indicated that a kernel driver must be written for the USB to function on macOS. I have a .cpp file that can be converted into a .dll file to work on the Windows side. Is it possible to reuse this .cpp file and convert it into a .so file that can run on the macOS side? Is there someone interested in this project? I am looking to outsource it.

Hello We have a USB camera. My Mac can recognize it and we can get frames with any software. There is a physical button on it and the vendor says the camera is UVC-compliant. But button doesn't work anyway. I captured some USB traffic data and saw that it has two interfaces. One for streaming and other one for interrupting (like button click). I read UVC 1.5 standards to understand it and it is working like written in UVC 1.5. So, I can get a data with an interrupt transfer when clicking the button. I checked these two interfaces, they use UVCAssistant for driver(System Extension). I tried to use libusb, I can get data from button click. But for frames I had to use libuvc, but it wasn't work for my camera (I think it is related with USB descriptor parsing in libuvc). I thought that I should write a driver for single interface and so second interface will use same UVC assistant driver and first interface will use my driver. I wrote a driver and it matches with first interface. But second interface is empty (unhandled by any driver). I want to load UVCAssistant for second interface of USB port. How can I do this? Output before loading my driver After loading: IOKitPersonalities that I used:

USB-Devices without macOS support Every so often I find usefull USB consumer hardware without any macOS support. At best accompanied with some sample code aimed at Linux using libUSB and/or a datasheet [1]. Using code snippets from long since archived IOKit documentation I can deal with that. IOUSBHost Using working IOKit based ObjC Foundation command-line code[2] as reference I am attempting to use theIOUSBHost framework (ObjC Foundation tool). IOUSBHost documentation[3] has all the ingredients but lacks a recipy. Starting with a plugged-in USBDevice and using its idVendor and idProduct[4] I can initialize and destroy base class IOUSBObject and get notified when I unplug the USBDevice. initialize and destroy IOUSBHostDevice[5] and retrieve various descriptors [6] and configure with value: 0, and even do a vendor bmRequestType request without error. But since I already beforehand know the content of my descriptors I can start with IOUSBHostInterface?[7] , needed for my 3 pipes, interrupt, bulk in and out. But Error:Unable to open io_service_t object and create user client. with reason: Exclusive open of usb object failed, whether I asked for exclusive access or not. So I could do with some guidance on how to use IOUSBHost[8]. Let Any Pointer bring joy. Using: Apple M1 Max, MacOS 13.0.1 (22A400), Xcode 14.1 (14B47b) Alternatives considered: Raspberry Pi using UDP (JSON;) over wifi. [1] e.g. https://www.digchip.com/datasheets/parts/datasheet/280/DS2490-pdf.php [2] depending on usage this might need a runloop [3] including dec 2022 https://www.usb.org/sites/default/files/usb_32_202206.zip I failed to find the phrase 'Host-mode'. HINT start by inspecting chapter 9 to get a taste of the terms like function, class, address and value and number. Those wordings will also appear in Apple's documentation. NOTE Tables in chapter 9: Assuming D[n]: stands for bitNr[n] in a bitmap where D[0] is the least significant bit. USEFULL No. [4] use the IORegistryExplorer.app and/or ioreg in Terminal [5] IOUSBHostInterface.h tells me: CFMutableDictionaryRef to be used with IOService matching methods. To be released by caller. But as far a I know CFFoundation is now under ARC. [6] IOUSBInterfaceDescriptor * next = IOUSBGetNextInterfaceDescriptor(configurationDescriptor, nil); while (next != nil) // needs cast (IOUSBDescriptorHeader *)next [7] signed to run locally [8] My next step would be using Swift. Off topic but related and disturbing in a type safe world https://forums.swift.org/t/nsdata-data-vs-data-withunsafebytes/50231/5 Please please please never use NSData.bytes in Swift code. Is this why IOUSBHostObject ioDataWithCapacity uses NSMutableData? Quote: Because the kernel backs the NSMutableData object, the length and capacity aren’t mutable. Any changes to the length or capacity throws an exception. Effectively treating NSMutableData as NSData, only the compiler complains beforehand when an attempt is made to modify the length of NSData (data.bytes ARE mutable)

I have a command line tool and am trying to connect to a USB device using:    _device = [[IOUSBHostDevice alloc] initWithIOService:_service    options:IOUSBHostObjectInitOptionsDeviceCapture    queue:_queue    error:&error    interestHandler:^(IOUSBHostObject * _Nonnull hostObject, uint32_t messageType, void * _Nullable messageArgument) {     NSLog(@"Interest handler...");    }]; However, when I run this tool (even under sudo), I'm hitting the error: Error:Unable to open io\_service\_t object and create user client. with reason: Exclusive open of usb object failed. The documentation for IOUSBHostObjectInitOptionsDeviceCapture implies that using this option and having root privilege should gain exclusive access to the device. The alternative is to use an entitlement, but the executable is terminated immediately in that case probably due to code signing. I would have expected that running the tool under sudo would have been sufficient to avoid this issue. I just want to first get things working locally on my Mac for a proof of concept, so I don't really want to deal with code signing up front unless that is absolutely necessary. What do I need to do to get exclusive access to the USB device? Thanks in advance.

I connected the Prolific USB to Serial converter but it does not work, checking the driver does not appear after installation, could you help me Thank you