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USB_DRIVER_SET_CONFI(9) USB Core APIs USB_DRIVER_SET_CONFI(9)

NAME

usb_driver_set_configuration - Provide a way for drivers to change device configurations

SYNOPSIS

int usb_driver_set_configuration(struct usb_device * udev, int config);

ARGUMENTS

udev

the device whose configuration is being updated

config

the configuration being chosen.

CONTEXT

In process context, must be able to sleep

DESCRIPTION

Device interface drivers are not allowed to change device configurations. This is because changing configurations will destroy the interface the driver is bound to and create new ones; it would be like a floppy-disk driver telling the computer to replace the floppy-disk drive with a tape drive!

Still, in certain specialized circumstances the need may arise. This routine gets around the normal restrictions by using a work thread to submit the change-config request.

RETURN

0 if the request was successfully queued, error code otherwise. The caller has no way to know whether the queued request will eventually succeed.

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June 2024 Kernel Hackers Manual 3.10