xref: /openbmc/linux/drivers/usb/gadget/Kconfig (revision 028b271b)

#
# 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"

config USB_GADGET
	tristate "Support for USB Gadgets"
	help
	   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
	   motherboards.

	   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 <http://www.linux-usb.org/gadget> and
	   the kernel DocBook documentation for this API.

config USB_GADGET_DEBUG_FILES
	boolean "Debugging information files"
	depends on USB_GADGET && PROC_FS
	help
	   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".

config	USB_GADGET_SELECTED
	boolean

#
# USB Peripheral Controller Support
#
choice
	prompt "USB Peripheral Controller"
	depends on USB_GADGET
	help
	   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
	select USB_GADGET_DUALSPEED
	help
	   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
	   functions.

	   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
	tristate
	depends on USB_GADGET_NET2280
	default USB_GADGET
	select USB_GADGET_SELECTED

config USB_GADGET_PXA2XX
	boolean "PXA 25x or IXP 4xx"
	depends on (ARCH_PXA && PXA25x) || ARCH_IXP4XX
	help
	   Intel's PXA 25x 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
	tristate
	depends on USB_GADGET_PXA2XX
	default USB_GADGET
	select USB_GADGET_SELECTED

# if there's only one gadget driver, using only two bulk endpoints,
# don't waste memory for the other endpoints
config USB_PXA2XX_SMALL
	depends on USB_GADGET_PXA2XX
	bool
	default n if USB_ETH_RNDIS
	default y if USB_ZERO
	default y if USB_ETH
	default y if USB_G_SERIAL

config USB_GADGET_GOKU
	boolean "Toshiba TC86C001 'Goku-S'"
	depends on PCI
	help
	   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
	tristate
	depends on USB_GADGET_GOKU
	default USB_GADGET
	select USB_GADGET_SELECTED


config USB_GADGET_LH7A40X
	boolean "LH7A40X"
	depends on ARCH_LH7A40X
	help
    This driver provides USB Device Controller driver for LH7A40x

config USB_LH7A40X
	tristate
	depends on USB_GADGET_LH7A40X
	default USB_GADGET
	select USB_GADGET_SELECTED


config USB_GADGET_OMAP
	boolean "OMAP USB Device Controller"
	depends on ARCH_OMAP
	select ISP1301_OMAP if MACH_OMAP_H2 || MACH_OMAP_H3
	help
	   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
	tristate
	depends on USB_GADGET_OMAP
	default USB_GADGET
	select USB_GADGET_SELECTED

config USB_OTG
	boolean "OTG Support"
	depends on USB_GADGET_OMAP && ARCH_OMAP_OTG && USB_OHCI_HCD
	help
	   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.


config USB_GADGET_DUMMY_HCD
	boolean "Dummy HCD (DEVELOPMENT)"
	depends on USB && EXPERIMENTAL
	select USB_GADGET_DUALSPEED
	help
	  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.

config USB_DUMMY_HCD
	tristate
	depends on USB_GADGET_DUMMY_HCD
	default USB_GADGET
	select USB_GADGET_SELECTED

# NOTE:  Please keep dummy_hcd LAST so that "real hardware" appears
# first and will be selected by default.

endchoice

config USB_GADGET_DUALSPEED
	bool
	depends on USB_GADGET
	default n
	help
	  Means that gadget drivers should include extra descriptors
	  and code to handle dual-speed controllers.

#
# USB Gadget Drivers
#
choice
	tristate "USB Gadget Drivers"
	depends on USB_GADGET && USB_GADGET_SELECTED
	default USB_ETH
	help
	  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)"
	depends on EXPERIMENTAL
	help
	  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".

config USB_ZERO_HNPTEST
	boolean "HNP Test Device"
	depends on USB_ZERO && USB_OTG
	help
	  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
	help
	  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".

config USB_ETH_RNDIS
	bool "RNDIS support (EXPERIMENTAL)"
	depends on USB_ETH && EXPERIMENTAL
	default y
	help
	   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.

config USB_GADGETFS
	tristate "Gadget Filesystem (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  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".

config USB_FILE_STORAGE
	tristate "File-backed Storage Gadget"
	help
	  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".

config USB_FILE_STORAGE_TEST
	bool "File-backed Storage Gadget testing version"
	depends on USB_FILE_STORAGE
	default n
	help
	  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.

config USB_G_SERIAL
	tristate "Serial Gadget (with CDC ACM support)"
	help
	  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

endchoice

endmenu