Dear Linux USB Subsystem Community, I hope this email finds you well. We are currently working on a USB device driver in the Linux kernel space, which supports the suspend/resume functionality for a USB device using the struct usb_driver's .suspend and .resume callbacks. In our driver code, we perform a check to determine if the device has remote wakeup capability. If the device supports remote wakeup, we enable the device's autosuspend mode by setting the struct usb_device->dev.power.autosuspend_delay parameter and then calling usb_enable_autosuspend(). Similarly, to resume the suspended device, we expose an API to user space via IOCTL. In this process, we set struct usb_device->dev.power.autosuspend_delay to -1 and then call usb_disable_autosuspend(). While we have successfully converted most of the USB device driver functionality from kernel space to user space using libusb, we are now seeking guidance on how to implement USB device suspend/resume in user space. Specifically, we would like to know if libusb provides support for achieving the suspend/resume functionality mentioned above. Additionally, any insights or suggestions on how to accomplish this task would be greatly appreciated. It's worth mentioning that our USB device driver also supports Bulk\Coontrol I/O transfers and other functionalities. Thank you in advance for any assistance you can provide. I look forward to your valuable inputs and recommendations. -- Thanks, Sekhar
