USB_IFNUM_TO_IF(9) USB Core APIs USB_IFNUM_TO_IF(9)NAME
usb_ifnum_to_if - get the interface object with a given interface number
SYNOPSIS
struct usb_interface * usb_ifnum_to_if(const struct usb_device * dev, unsigned ifnum);
ARGUMENTS
dev
the device whose current configuration is considered
ifnum
the desired interface
DESCRIPTION
This walks the device descriptor for the currently active configuration and returns a pointer to the interface with that particular
interface number, or null.
Note that configuration descriptors are not required to assign interface numbers sequentially, so that it would be incorrect to assume that
the first interface in that descriptor corresponds to interface zero. This routine helps device drivers avoid such mistakes. However, you
should make sure that you do the right thing with any alternate settings available for this interfaces.
Don't call this function unless you are bound to one of the interfaces on this device or you have locked the device!
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_IFNUM_TO_IF(9)
Check Out this Related Man Page
STRUCT USB_HOST_CONF(9) Host-Side Data Types and Macro STRUCT USB_HOST_CONF(9)NAME
struct_usb_host_config - representation of a device's configuration
SYNOPSIS
struct usb_host_config {
struct usb_config_descriptor desc;
char * string;
struct usb_interface_assoc_descriptor * intf_assoc[USB_MAXIADS];
struct usb_interface * interface[USB_MAXINTERFACES];
struct usb_interface_cache * intf_cache[USB_MAXINTERFACES];
unsigned char * extra;
int extralen;
};
MEMBERS
desc
the device's configuration descriptor.
string
pointer to the cached version of the iConfiguration string, if present for this configuration.
intf_assoc[USB_MAXIADS]
list of any interface association descriptors in this config
interface[USB_MAXINTERFACES]
array of pointers to usb_interface structures, one for each interface in the configuration. The number of interfaces is stored in
desc.bNumInterfaces. These pointers are valid only while the the configuration is active.
intf_cache[USB_MAXINTERFACES]
array of pointers to usb_interface_cache structures, one for each interface in the configuration. These structures exist for the entire
life of the device.
extra
pointer to buffer containing all extra descriptors associated with this configuration (those preceding the first interface descriptor).
extralen
length of the extra descriptors buffer.
DESCRIPTION
USB devices may have multiple configurations, but only one can be active at any time. Each encapsulates a different operational
environment; for example, a dual-speed device would have separate configurations for full-speed and high-speed operation. The number of
configurations available is stored in the device descriptor as bNumConfigurations.
A configuration can contain multiple interfaces. Each corresponds to a different function of the USB device, and all are available whenever
the configuration is active. The USB standard says that interfaces are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
of devices get this wrong. In addition, the interface array is not guaranteed to be sorted in numerical order. Use usb_ifnum_to_if to look
up an interface entry based on its number.
Device drivers should not attempt to activate configurations. The choice of which configuration to install is a policy decision based on
such considerations as available power, functionality provided, and the user's desires (expressed through userspace tools). However,
drivers can call usb_reset_configuration to reinitialize the current configuration and all its interfaces.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT USB_HOST_CONF(9)