OS X and iOS Kernel Programming

Summary

• At the time of writing, the Universal Serial Bus Specification exists in three major revisions, the latest being USB 3.0. USB 3.0, although emerging rapidly in the PC segment, has not yet been adopted by Apple, which at the time of writing only supports USB 2.0,
• A USB uses a shared bus topology, where up to 127 devices can be controlled by a single host. The host controller is the master of the bus, and controls all activity on the bus. A device is never allowed to use the bus without permission from the host.
• A USB device is described by a hierarchical structure of descriptors, which contain information about the class, type, capabilities, and requirements of the device.
• A USB device may consist of zero or more interfaces, which are ...