drivers/usb/gadget/Kconfig - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 #
 # 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 controllers.
 #
 # 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 "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 228x"
 	depends on PCI
 	select USB_GADGET_DUALSPEED
 	help
 	   NetChip 2280 / 2282 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_AT91
 	boolean "AT91 USB Device Port"
 	depends on ARCH_AT91RM9200
 	select USB_GADGET_SELECTED
 	help
 	   Many Atmel AT91 processors (such as the AT91RM2000) have a
 	   full speed USB Device Port with support for five configurable
 	   endpoints (plus endpoint zero).

 	   Say "y" to link the driver statically, or "m" to build a
 	   dynamically linked module called "at91_udc" and force all
 	   gadget drivers to also be dynamically linked.

 config USB_AT91
 	tristate
 	depends on USB_GADGET_AT91
 	default USB_GADGET

 config USB_GADGET_DUMMY_HCD
 	boolean "Dummy HCD (DEVELOPMENT)"
 	depends on (USB=y || (USB=m && USB_GADGET=m)) && 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.

 config USB_MIDI_GADGET
 	tristate "MIDI Gadget (EXPERIMENTAL)"
 	depends on SND && EXPERIMENTAL
 	select SND_RAWMIDI
 	help
 	  The MIDI Gadget acts as a USB Audio device, with one MIDI
 	  input and one MIDI output. These MIDI jacks appear as
 	  a sound "card" in the ALSA sound system. Other MIDI
 	  connections can then be made on the gadget system, using
 	  ALSA's aconnect utility etc.

 	  Say "y" to link the driver statically, or "m" to build a
 	  dynamically linked module called "g_midi".


 # put drivers that need isochronous transfer support (for audio
 # or video class gadget drivers), or specific hardware, here.

 # - none yet

 endchoice

 endmenu
	#
	# 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 controllers.
	#
	# 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 "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 228x"
	depends on PCI
	select USB_GADGET_DUALSPEED
	help
	NetChip 2280 / 2282 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_AT91
	boolean "AT91 USB Device Port"
	depends on ARCH_AT91RM9200
	select USB_GADGET_SELECTED
	help
	Many Atmel AT91 processors (such as the AT91RM2000) have a
	full speed USB Device Port with support for five configurable
	endpoints (plus endpoint zero).

	Say "y" to link the driver statically, or "m" to build a
	dynamically linked module called "at91_udc" and force all
	gadget drivers to also be dynamically linked.

	config USB_AT91
	tristate
	depends on USB_GADGET_AT91
	default USB_GADGET

	config USB_GADGET_DUMMY_HCD
	boolean "Dummy HCD (DEVELOPMENT)"
	depends on (USB=y \|\| (USB=m && USB_GADGET=m)) && 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.

	config USB_MIDI_GADGET
	tristate "MIDI Gadget (EXPERIMENTAL)"
	depends on SND && EXPERIMENTAL
	select SND_RAWMIDI
	help
	The MIDI Gadget acts as a USB Audio device, with one MIDI
	input and one MIDI output. These MIDI jacks appear as
	a sound "card" in the ALSA sound system. Other MIDI
	connections can then be made on the gadget system, using
	ALSA's aconnect utility etc.

	Say "y" to link the driver statically, or "m" to build a
	dynamically linked module called "g_midi".


	# put drivers that need isochronous transfer support (for audio
	# or video class gadget drivers), or specific hardware, here.

	# - none yet

	endchoice

	endmenu