MODULE_USB_DRIVER(9) Host-Side Data Types and Macro MODULE_USB_DRIVER(9)NAME
module_usb_driver - Helper macro for registering a USB driver
Helper macro for USB drivers which do not do anything special in module init/exit. This eliminates a lot of boilerplate. Each module may
only use this macro once, and calling it replaces module_init and module_exit
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 MODULE_USB_DRIVER(9)
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USB_MAKE_PATH(9) Host-Side Data Types and Macro USB_MAKE_PATH(9)NAME
usb_make_path - returns stable device path in the usb tree
int usb_make_path(struct usb_device * dev, char * buf, size_t size);
the device whose path is being constructed
where to put the string
how big is "buf"?
Length of the string (> 0) or negative if size was too small.
This identifier is intended to be "stable", reflecting physical paths in hardware such as physical bus addresses for host controllers or
ports on USB hubs. That makes it stay the same until systems are physically reconfigured, by re-cabling a tree of USB devices or by moving
USB host controllers. Adding and removing devices, including virtual root hubs in host controller driver modules, does not change these
path identifiers; neither does rebooting or re-enumerating. These are more useful identifiers than changeable ("unstable") ones like bus
numbers or device addresses.
With a partial exception for devices connected to USB 2.0 root hubs, these identifiers are also predictable. So long as the device tree
isn't changed, plugging any USB device into a given hub port always gives it the same path. Because of the use of "companion" controllers,
devices connected to ports on USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are high speed, and a different one if
they are full or low speed.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_MAKE_PATH(9)
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