USB_DEVICE_INFO(9) Host-Side Data Types and Macro USB_DEVICE_INFO(9)NAME
USB_DEVICE_INFO - macro used to describe a class of usb devices
SYNOPSIS
USB_DEVICE_INFO(cl, sc, pr);
ARGUMENTS
cl
bDeviceClass value
sc
bDeviceSubClass value
pr
bDeviceProtocol value
DESCRIPTION
This macro is used to create a struct usb_device_id that matches a specific class of devices.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_DEVICE_INFO(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
SYNOPSIS
int usb_make_path(struct usb_device * dev, char * buf, size_t size);
ARGUMENTS
dev
the device whose path is being constructed
buf
where to put the string
size
how big is "buf"?
DESCRIPTION
Returns 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 identifers; 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 2.6. July 2010 USB_MAKE_PATH(9)
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