usb_autopm_get_interface
Prev | Chapter 5. USB Core APIs | Next

## Name

usb_autopm_get_interface — increment a USB interface's PM-usage counter

## Synopsis

`int usb_autopm_get_interface (` | struct usb_interface * intf`)`;

## Arguments

`intf`

  the usb_interface whose counter should be incremented

## Description

This routine should be called by an interface driver when it wants to use `intf` and needs to guarantee that it is not suspended. In addition, the routine prevents `intf` from being autosuspended subsequently. (Note that this will not prevent suspend events originating in the PM core.) This prevention will persist until `usb_autopm_put_interface` is called or `intf` is unbound. A typical example would be a character-device driver when its device file is opened.

`intf`'s usage counter is incremented to prevent subsequent autosuspends. However if the autoresume fails then the counter is re-decremented.

This routine can run only in process context.

## Return

0 on success.

Prev | Up | Next
usb_autopm_put_interface_no_suspend | Home | usb_autopm_get_interface_async