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# USB Gadget support on a system involves
# (a) a peripheral controller, and
# (b) the gadget driver using it.
# NOTE: Gadget support ** DOES NOT ** depend on host-side CONFIG_USB !!
# - Host systems (like PCs) need CONFIG_USB (with "A" jacks).
# - Peripherals (like PDAs) need CONFIG_USB_GADGET (with "B" jacks).
# - Some systems have both kinds of of controller.
# With help from a special transceiver and a "Mini-AB" jack, systems with
# both kinds of controller can also support "USB On-the-Go" (CONFIG_USB_OTG).
menu "USB Gadget Support"
tristate "Support for USB Gadgets"
USB is a master/slave protocol, organized with one master
host (such as a PC) controlling up to 127 peripheral devices.
The USB hardware is asymmetric, which makes it easier to set up:
you can't connect a "to-the-host" connector to a peripheral.
Linux can run in the host, or in the peripheral. In both cases
you need a low level bus controller driver, and some software
talking to it. Peripheral controllers are often discrete silicon,
or are integrated with the CPU in a microcontroller. The more
familiar host side controllers have names like like "EHCI", "OHCI",
or "UHCI", and are usually integrated into southbridges on PC
Enable this configuration option if you want to run Linux inside
a USB peripheral device. Configure one hardware driver for your
peripheral/device side bus controller, and a "gadget driver" for
your peripheral protocol. (If you use modular gadget drivers,
you may configure more than one.)
If in doubt, say "N" and don't enable these drivers; most people
don't have this kind of hardware (except maybe inside Linux PDAs).
For more information, see <> and
the kernel DocBook documentation for this API.
boolean "Debugging information files"
depends on USB_GADGET && PROC_FS
Some of the drivers in the "gadget" framework can expose
debugging information in files such as /proc/driver/udc
(for a peripheral controller). The information in these
files may help when you're troubleshooting or bringing up a
driver on a new board. Enable these files by choosing "Y"
here. If in doubt, or to conserve kernel memory, say "N".
# USB Peripheral Controller Support
prompt "USB Peripheral Controller"
depends on USB_GADGET
A USB device uses a controller to talk to its host.
Systems should have only one such upstream link.
Many controller drivers are platform-specific; these
often need board-specific hooks.
config USB_GADGET_NET2280
boolean "NetChip 2280"
depends on PCI
NetChip 2280 is a PCI based USB peripheral controller which
supports both full and high speed USB 2.0 data transfers.
It has six configurable endpoints, as well as endpoint zero
(for control transfers) and several endpoints with dedicated
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "net2280" and force all
gadget drivers to also be dynamically linked.
config USB_NET2280
depends on USB_GADGET_NET2280
default USB_GADGET
boolean "PXA 2xx or IXP 4xx"
depends on ARCH_PXA || ARCH_IXP4XX
Intel's PXA 2xx series XScale ARM-5TE processors include
an integrated full speed USB 1.1 device controller. The
controller in the IXP 4xx series is register-compatible.
It has fifteen fixed-function endpoints, as well as endpoint
zero (for control transfers).
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "pxa2xx_udc" and force all
gadget drivers to also be dynamically linked.
config USB_PXA2XX
depends on USB_GADGET_PXA2XX
default USB_GADGET
# if there's only one gadget driver, using only two bulk endpoints,
# don't waste memory for the other endpoints
depends on USB_GADGET_PXA2XX
default n if USB_ETH_RNDIS
default y if USB_ZERO
default y if USB_ETH
default y if USB_G_SERIAL
boolean "Toshiba TC86C001 'Goku-S'"
depends on PCI
The Toshiba TC86C001 is a PCI device which includes controllers
for full speed USB devices, IDE, I2C, SIO, plus a USB host (OHCI).
The device controller has three configurable (bulk or interrupt)
endpoints, plus endpoint zero (for control transfers).
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "goku_udc" and to force all
gadget drivers to also be dynamically linked.
config USB_GOKU
depends on USB_GADGET_GOKU
default USB_GADGET
# this could be built elsewhere (doesn't yet exist)
config USB_GADGET_SA1100
boolean "SA 1100"
depends on ARCH_SA1100
Intel's SA-1100 is an ARM-4 processor with an integrated
full speed USB 1.1 device controller.
It has two fixed-function endpoints, as well as endpoint
zero (for control transfers).
config USB_SA1100
depends on USB_GADGET_SA1100
default USB_GADGET
boolean "LH7A40X"
depends on ARCH_LH7A40X
This driver provides USB Device Controller driver for LH7A40x
config USB_LH7A40X
depends on USB_GADGET_LH7A40X
default USB_GADGET
boolean "Dummy HCD (DEVELOPMENT)"
depends on USB && EXPERIMENTAL
This host controller driver emulates USB, looping all data transfer
requests back to a USB "gadget driver" in the same host. The host
side is the master; the gadget side is the slave. Gadget drivers
can be high, full, or low speed; and they have access to endpoints
like those from NET2280, PXA2xx, or SA1100 hardware.
This may help in some stages of creating a driver to embed in a
Linux device, since it lets you debug several parts of the gadget
driver without its hardware or drivers being involved.
Since such a gadget side driver needs to interoperate with a host
side Linux-USB device driver, this may help to debug both sides
of a USB protocol stack.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "dummy_hcd" and force all
gadget drivers to also be dynamically linked.
default USB_GADGET
boolean "OMAP USB Device Controller"
depends on ARCH_OMAP
select ISP1301_OMAP if MACH_OMAP_H2
Many Texas Instruments OMAP processors have flexible full
speed USB device controllers, with support for up to 30
endpoints (plus endpoint zero). This driver supports the
controller in the OMAP 1611, and should work with controllers
in other OMAP processors too, given minor tweaks.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "omap_udc" and force all
gadget drivers to also be dynamically linked.
config USB_OMAP
depends on USB_GADGET_OMAP
default USB_GADGET
config USB_OTG
boolean "OTG Support"
The most notable feature of USB OTG is support for a
"Dual-Role" device, which can act as either a device
or a host. The initial role choice can be changed
later, when two dual-role devices talk to each other.
Select this only if your OMAP board has a Mini-AB connector.
depends on USB_GADGET
default n
Means that gadget drivers should include extra descriptors
and code to handle dual-speed controllers.
# USB Gadget Drivers
tristate "USB Gadget Drivers"
depends on USB_GADGET
default USB_ETH
A Linux "Gadget Driver" talks to the USB Peripheral Controller
driver through the abstract "gadget" API. Some other operating
systems call these "client" drivers, of which "class drivers"
are a subset (implementing a USB device class specification).
A gadget driver implements one or more USB functions using
the peripheral hardware.
Gadget drivers are hardware-neutral, or "platform independent",
except that they sometimes must understand quirks or limitations
of the particular controllers they work with. For example, when
a controller doesn't support alternate configurations or provide
enough of the right types of endpoints, the gadget driver might
not be able work with that controller, or might need to implement
a less common variant of a device class protocol.
# this first set of drivers all depend on bulk-capable hardware.
config USB_ZERO
tristate "Gadget Zero (DEVELOPMENT)"
Gadget Zero is a two-configuration device. It either sinks and
sources bulk data; or it loops back a configurable number of
transfers. It also implements control requests, for "chapter 9"
conformance. The driver needs only two bulk-capable endpoints, so
it can work on top of most device-side usb controllers. It's
useful for testing, and is also a working example showing how
USB "gadget drivers" can be written.
Make this be the first driver you try using on top of any new
USB peripheral controller driver. Then you can use host-side
test software, like the "usbtest" driver, to put your hardware
and its driver through a basic set of functional tests.
Gadget Zero also works with the host-side "usb-skeleton" driver,
and with many kinds of host-side test software. You may need
to tweak product and vendor IDs before host software knows about
this device, and arrange to select an appropriate configuration.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_zero".
boolean "HNP Test Device"
depends on USB_ZERO && USB_OTG
You can configure this device to enumerate using the device
identifiers of the USB-OTG test device. That means that when
this gadget connects to another OTG device, with this one using
the "B-Peripheral" role, that device will use HNP to let this
one serve as the USB host instead (in the "B-Host" role).
config USB_ETH
tristate "Ethernet Gadget (with CDC Ethernet support)"
depends on NET
This driver implements Ethernet style communication, in either
of two ways:
- The "Communication Device Class" (CDC) Ethernet Control Model.
That protocol is often avoided with pure Ethernet adapters, in
favor of simpler vendor-specific hardware, but is widely
supported by firmware for smart network devices.
- On hardware can't implement that protocol, a simple CDC subset
is used, placing fewer demands on USB.
RNDIS support is a third option, more demanding than that subset.
Within the USB device, this gadget driver exposes a network device
"usbX", where X depends on what other networking devices you have.
Treat it like a two-node Ethernet link: host, and gadget.
The Linux-USB host-side "usbnet" driver interoperates with this
driver, so that deep I/O queues can be supported. On 2.4 kernels,
use "CDCEther" instead, if you're using the CDC option. That CDC
mode should also interoperate with standard CDC Ethernet class
drivers on other host operating systems.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_ether".
bool "RNDIS support (EXPERIMENTAL)"
default y
Microsoft Windows XP bundles the "Remote NDIS" (RNDIS) protocol,
and Microsoft provides redistributable binary RNDIS drivers for
older versions of Windows.
If you say "y" here, the Ethernet gadget driver will try to provide
a second device configuration, supporting RNDIS to talk to such
Microsoft USB hosts.
To make MS-Windows work with this, use Documentation/usb/linux.inf
as the "driver info file". For versions of MS-Windows older than
XP, you'll need to download drivers from Microsoft's website; a URL
is given in comments found in that info file.
tristate "Gadget Filesystem (EXPERIMENTAL)"
This driver provides a filesystem based API that lets user mode
programs implement a single-configuration USB device, including
endpoint I/O and control requests that don't relate to enumeration.
All endpoints, transfer speeds, and transfer types supported by
the hardware are available, through read() and write() calls.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "gadgetfs".
tristate "File-backed Storage Gadget"
# we don't support the SA1100 because of its limitations
depends on USB_GADGET_SA1100 = n
The File-backed Storage Gadget acts as a USB Mass Storage
disk drive. As its storage repository it can use a regular
file or a block device (in much the same way as the "loop"
device driver), specified as a module parameter.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_file_storage".
bool "File-backed Storage Gadget testing version"
default n
Say "y" to generate the larger testing version of the
File-backed Storage Gadget, useful for probing the
behavior of USB Mass Storage hosts. Not needed for
normal operation.
tristate "Serial Gadget (with CDC ACM support)"
The Serial Gadget talks to the Linux-USB generic serial driver.
This driver supports a CDC-ACM module option, which can be used
to interoperate with MS-Windows hosts or with the Linux-USB
"cdc-acm" driver.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_serial".
For more information, see Documentation/usb/gadget_serial.txt
which includes instructions and a "driver info file" needed to
make MS-Windows work with this driver.
# put drivers that need isochronous transfer support (for audio
# or video class gadget drivers), or specific hardware, here.
# - none yet