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linux-stable/drivers/usb/gadget/Kconfig
Per Forlin 6532c7fdb2 usb: gadget: storage: make FSG_NUM_BUFFERS variable size 
FSG_NUM_BUFFERS is set to 2 as default.
Usually 2 buffers are enough to establish a good buffering pipeline.
The number may be increased in order to compensate a for bursty VFS
behaviour.

Here follows a description of system that may require more than
2 buffers.
 * CPU ondemand governor active
 * latency cost for wake up and/or frequency change
 * DMA for IO

Use case description.
 * Data transfer from MMC via VFS to USB.
 * DMA shuffles data from MMC and to USB.
 * The CPU wakes up every now and then to pass data in and out from VFS,
   which cause the bursty VFS behaviour.

Test set up
 * Running dd on the host reading from the mass storage device
 * cmdline: dd if=/dev/sdb of=/dev/null bs=4k count=$((256*100))
 * Caches are dropped on the host and on the device before each run

Measurements on a Snowball board with ondemand_governor active.

FSG_NUM_BUFFERS 2
104857600 bytes (105 MB) copied, 5.62173 s, 18.7 MB/s
104857600 bytes (105 MB) copied, 5.61811 s, 18.7 MB/s
104857600 bytes (105 MB) copied, 5.57817 s, 18.8 MB/s

FSG_NUM_BUFFERS 4
104857600 bytes (105 MB) copied, 5.26839 s, 19.9 MB/s
104857600 bytes (105 MB) copied, 5.2691 s, 19.9 MB/s
104857600 bytes (105 MB) copied, 5.2711 s, 19.9 MB/s

There may not be one optimal number for all boards. This is why
the number is added to Kconfig. If selecting USB_GADGET_DEBUG_FILES
this value may be set by a module parameter as well.

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2011-09-09 13:06:04 +03:00

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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 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).
#
menuconfig USB_GADGET
tristate "USB Gadget Support"
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.
if USB_GADGET
config USB_GADGET_DEBUG
boolean "Debugging messages (DEVELOPMENT)"
depends on DEBUG_KERNEL
help
Many controller and gadget drivers will print some debugging
messages if you use this option to ask for those messages.
Avoid enabling these messages, even if you're actively
debugging such a driver. Many drivers will emit so many
messages that the driver timings are affected, which will
either create new failure modes or remove the one you're
trying to track down. Never enable these messages for a
production build.
config USB_GADGET_DEBUG_FILES
boolean "Debugging information files (DEVELOPMENT)"
depends on 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_DEBUG_FS
boolean "Debugging information files in debugfs (DEVELOPMENT)"
depends on DEBUG_FS
help
Some of the drivers in the "gadget" framework can expose
debugging information in files under /sys/kernel/debug/.
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_VBUS_DRAW
int "Maximum VBUS Power usage (2-500 mA)"
range 2 500
default 2
help
Some devices need to draw power from USB when they are
configured, perhaps to operate circuitry or to recharge
batteries. This is in addition to any local power supply,
such as an AC adapter or batteries.
Enter the maximum power your device draws through USB, in
milliAmperes. The permitted range of values is 2 - 500 mA;
0 mA would be legal, but can make some hosts misbehave.
This value will be used except for system-specific gadget
drivers that have more specific information.
config USB_GADGET_STORAGE_NUM_BUFFERS
int "Number of storage pipeline buffers"
range 2 4
default 2
help
Usually 2 buffers are enough to establish a good buffering
pipeline. The number may be increased in order to compensate
for a bursty VFS behaviour. For instance there may be CPU wake up
latencies that makes the VFS to appear bursty in a system with
an CPU on-demand governor. Especially if DMA is doing IO to
offload the CPU. In this case the CPU will go into power
save often and spin up occasionally to move data within VFS.
If selecting USB_GADGET_DEBUG_FILES this value may be set by
a module parameter as well.
If unsure, say 2.
#
# USB Peripheral Controller Support
#
# The order here is alphabetical, except that integrated controllers go
# before discrete ones so they will be the initial/default value:
# - integrated/SOC controllers first
# - licensed IP used in both SOC and discrete versions
# - discrete ones (including all PCI-only controllers)
# - debug/dummy gadget+hcd is last.
#
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.
#
# Integrated controllers
#
config USB_AT91
tristate "Atmel AT91 USB Device Port"
depends on ARCH_AT91 && !ARCH_AT91SAM9RL && !ARCH_AT91CAP9 && !ARCH_AT91SAM9G45
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_ATMEL_USBA
tristate "Atmel USBA"
select USB_GADGET_DUALSPEED
depends on AVR32 || ARCH_AT91CAP9 || ARCH_AT91SAM9RL || ARCH_AT91SAM9G45
help
USBA is the integrated high-speed USB Device controller on
the AT32AP700x, some AT91SAM9 and AT91CAP9 processors from Atmel.
config USB_FSL_USB2
tristate "Freescale Highspeed USB DR Peripheral Controller"
depends on FSL_SOC || ARCH_MXC
select USB_GADGET_DUALSPEED
select USB_FSL_MPH_DR_OF if OF
help
Some of Freescale PowerPC processors have a High Speed
Dual-Role(DR) USB controller, which supports device mode.
The number of programmable endpoints is different through
SOC revisions.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "fsl_usb2_udc" and force
all gadget drivers to also be dynamically linked.
config USB_FUSB300
tristate "Faraday FUSB300 USB Peripheral Controller"
depends on !PHYS_ADDR_T_64BIT
select USB_GADGET_DUALSPEED
help
Faraday usb device controller FUSB300 driver
config USB_OMAP
tristate "OMAP USB Device Controller"
depends on ARCH_OMAP
select ISP1301_OMAP if MACH_OMAP_H2 || MACH_OMAP_H3 || MACH_OMAP_H4_OTG
select USB_OTG_UTILS if ARCH_OMAP
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_PXA25X
tristate "PXA 25x or IXP 4xx"
depends on (ARCH_PXA && PXA25x) || ARCH_IXP4XX
select USB_OTG_UTILS
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 "pxa25x_udc" and force all
gadget drivers to also be dynamically linked.
# if there's only one gadget driver, using only two bulk endpoints,
# don't waste memory for the other endpoints
config USB_PXA25X_SMALL
depends on USB_PXA25X
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_R8A66597
tristate "Renesas R8A66597 USB Peripheral Controller"
select USB_GADGET_DUALSPEED
help
R8A66597 is a discrete USB host and peripheral controller chip that
supports both full and high speed USB 2.0 data transfers.
It has nine configurable endpoints, and endpoint zero.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "r8a66597_udc" and force all
gadget drivers to also be dynamically linked.
config USB_RENESAS_USBHS_UDC
tristate 'Renesas USBHS controller'
depends on SUPERH || ARCH_SHMOBILE
depends on USB_RENESAS_USBHS
select USB_GADGET_DUALSPEED
help
Renesas USBHS is a discrete USB host and peripheral controller chip
that supports both full and high speed USB 2.0 data transfers.
It has nine or more configurable endpoints, and endpoint zero.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "renesas_usbhs" and force all
gadget drivers to also be dynamically linked.
config USB_PXA27X
tristate "PXA 27x"
depends on ARCH_PXA && (PXA27x || PXA3xx)
select USB_OTG_UTILS
help
Intel's PXA 27x series XScale ARM v5TE processors include
an integrated full speed USB 1.1 device controller.
It has up to 23 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 "pxa27x_udc" and force all
gadget drivers to also be dynamically linked.
config USB_S3C_HSOTG
tristate "S3C HS/OtG USB Device controller"
depends on S3C_DEV_USB_HSOTG
select USB_GADGET_S3C_HSOTG_PIO
select USB_GADGET_DUALSPEED
help
The Samsung S3C64XX USB2.0 high-speed gadget controller
integrated into the S3C64XX series SoC.
config USB_IMX
tristate "Freescale i.MX1 USB Peripheral Controller"
depends on ARCH_MXC
help
Freescale's i.MX1 includes an integrated full speed
USB 1.1 device controller.
It has Six 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 "imx_udc" and force all
gadget drivers to also be dynamically linked.
config USB_S3C2410
tristate "S3C2410 USB Device Controller"
depends on ARCH_S3C2410
help
Samsung's S3C2410 is an ARM-4 processor with an integrated
full speed USB 1.1 device controller. It has 4 configurable
endpoints, as well as endpoint zero (for control transfers).
This driver has been tested on the S3C2410, S3C2412, and
S3C2440 processors.
config USB_S3C2410_DEBUG
boolean "S3C2410 udc debug messages"
depends on USB_S3C2410
config USB_S3C_HSUDC
tristate "S3C2416, S3C2443 and S3C2450 USB Device Controller"
depends on ARCH_S3C2410
select USB_GADGET_DUALSPEED
help
Samsung's S3C2416, S3C2443 and S3C2450 is an ARM9 based SoC
integrated with dual speed USB 2.0 device controller. It has
8 endpoints, as well as endpoint zero.
This driver has been tested on S3C2416 and S3C2450 processors.
config USB_PXA_U2O
tristate "PXA9xx Processor USB2.0 controller"
depends on ARCH_MMP
select USB_GADGET_DUALSPEED
help
PXA9xx Processor series include a high speed USB2.0 device
controller, which support high speed and full speed USB peripheral.
config USB_GADGET_DWC3
tristate "DesignWare USB3.0 (DRD) Controller"
depends on USB_DWC3
select USB_GADGET_DUALSPEED
select USB_GADGET_SUPERSPEED
help
DesignWare USB3.0 controller is a SuperSpeed USB3.0 Controller
which can be configured for peripheral-only, host-only, hub-only
and Dual-Role operation. This Controller was first integrated into
the OMAP5 series of processors. More information about the OMAP5
version of this controller, refer to http://www.ti.com/omap5.
#
# Controllers available in both integrated and discrete versions
#
# musb builds in ../musb along with host support
config USB_GADGET_MUSB_HDRC
tristate "Inventra HDRC USB Peripheral (TI, ADI, ...)"
depends on USB_MUSB_HDRC
select USB_GADGET_DUALSPEED
help
This OTG-capable silicon IP is used in dual designs including
the TI DaVinci, OMAP 243x, OMAP 343x, TUSB 6010, and ADI Blackfin
config USB_M66592
tristate "Renesas M66592 USB Peripheral Controller"
select USB_GADGET_DUALSPEED
help
M66592 is a discrete USB peripheral controller chip that
supports both full and high speed USB 2.0 data transfers.
It has seven configurable endpoints, and endpoint zero.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "m66592_udc" and force all
gadget drivers to also be dynamically linked.
#
# Controllers available only in discrete form (and all PCI controllers)
#
config USB_AMD5536UDC
tristate "AMD5536 UDC"
depends on PCI
select USB_GADGET_DUALSPEED
help
The AMD5536 UDC is part of the AMD Geode CS5536, an x86 southbridge.
It is a USB Highspeed DMA capable USB device controller. Beside ep0
it provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
The UDC port supports OTG operation, and may be used as a host port
if it's not being used to implement peripheral or OTG roles.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "amd5536udc" and force all
gadget drivers to also be dynamically linked.
config USB_FSL_QE
tristate "Freescale QE/CPM USB Device Controller"
depends on FSL_SOC && (QUICC_ENGINE || CPM)
help
Some of Freescale PowerPC processors have a Full Speed
QE/CPM2 USB controller, which support device mode with 4
programmable endpoints. This driver supports the
controller in the MPC8360 and MPC8272, and should work with
controllers having QE or CPM2, given minor tweaks.
Set CONFIG_USB_GADGET to "m" to build this driver as a
dynamically linked module called "fsl_qe_udc".
config USB_CI13XXX_PCI
tristate "MIPS USB CI13xxx PCI UDC"
depends on PCI
select USB_GADGET_DUALSPEED
help
MIPS USB IP core family device controller
Currently it only supports IP part number CI13412
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "ci13xxx_udc" and force all
gadget drivers to also be dynamically linked.
config USB_NET2272
tristate "PLX NET2272"
select USB_GADGET_DUALSPEED
help
PLX NET2272 is a USB peripheral controller which supports
both full and high speed USB 2.0 data transfers.
It has three configurable endpoints, as well as endpoint zero
(for control transfer).
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "net2272" and force all
gadget drivers to also be dynamically linked.
config USB_NET2272_DMA
boolean "Support external DMA controller"
depends on USB_NET2272
help
The NET2272 part can optionally support an external DMA
controller, but your board has to have support in the
driver itself.
If unsure, say "N" here. The driver works fine in PIO mode.
config USB_NET2280
tristate "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_GOKU
tristate "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_LANGWELL
tristate "Intel Langwell USB Device Controller"
depends on PCI
depends on !PHYS_ADDR_T_64BIT
select USB_GADGET_DUALSPEED
help
Intel Langwell USB Device Controller is a High-Speed USB
On-The-Go device controller.
The number of programmable endpoints is different through
controller revision.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "langwell_udc" and force all
gadget drivers to also be dynamically linked.
config USB_EG20T
tristate "Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH UDC"
depends on PCI
select USB_GADGET_DUALSPEED
help
This is a USB device driver for EG20T PCH.
EG20T PCH is the platform controller hub that is used in Intel's
general embedded platform. EG20T PCH has USB device interface.
Using this interface, it is able to access system devices connected
to USB device.
This driver enables USB device function.
USB device is a USB peripheral controller which
supports both full and high speed USB 2.0 data transfers.
This driver supports both control transfer and bulk transfer modes.
This driver dose not support interrupt transfer or isochronous
transfer modes.
This driver also can be used for OKI SEMICONDUCTOR's ML7213 which is
for IVI(In-Vehicle Infotainment) use.
ML7213 is companion chip for Intel Atom E6xx series.
ML7213 is completely compatible for Intel EG20T PCH.
config USB_CI13XXX_MSM
tristate "MIPS USB CI13xxx for MSM"
depends on ARCH_MSM
select USB_GADGET_DUALSPEED
select USB_MSM_OTG
help
MSM SoC has chipidea USB controller. This driver uses
ci13xxx_udc core.
This driver depends on OTG driver for PHY initialization,
clock management, powering up VBUS, and power management.
This driver is not supported on boards like trout which
has an external PHY.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "ci13xxx_msm" and force all
gadget drivers to also be dynamically linked.
#
# LAST -- dummy/emulated controller
#
config USB_DUMMY_HCD
tristate "Dummy HCD (DEVELOPMENT)"
depends on USB=y || (USB=m && USB_GADGET=m)
select USB_GADGET_DUALSPEED
select USB_GADGET_SUPERSPEED
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.
# NOTE: Please keep dummy_hcd LAST so that "real hardware" appears
# first and will be selected by default.
endchoice
# Selected by UDC drivers that support high-speed operation.
config USB_GADGET_DUALSPEED
bool
depends on USB_GADGET
# Selected by UDC drivers that support super-speed opperation
config USB_GADGET_SUPERSPEED
bool
depends on USB_GADGET
depends on USB_GADGET_DUALSPEED
#
# USB Gadget Drivers
#
choice
tristate "USB Gadget Drivers"
depends on USB_GADGET
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)"
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_AUDIO
tristate "Audio Gadget (EXPERIMENTAL)"
depends on SND
select SND_PCM
help
Gadget Audio is compatible with USB Audio Class specification 1.0.
It will include at least one AudioControl interface, zero or more
AudioStream interface and zero or more MIDIStream interface.
Gadget Audio will use on-board ALSA (CONFIG_SND) audio card to
playback or capture audio stream.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_audio".
config USB_ETH
tristate "Ethernet Gadget (with CDC Ethernet support)"
depends on NET
select CRC32
help
This driver implements Ethernet style communication, in one of
several 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.
- CDC Ethernet Emulation Model (EEM) is a newer standard that has
a simpler interface that can be used by more USB hardware.
RNDIS support is an additional option, more demanding than than
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"
depends on USB_ETH
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_ETH_EEM
bool "Ethernet Emulation Model (EEM) support"
depends on USB_ETH
default n
help
CDC EEM is a newer USB standard that is somewhat simpler than CDC ECM
and therefore can be supported by more hardware. Technically ECM and
EEM are designed for different applications. The ECM model extends
the network interface to the target (e.g. a USB cable modem), and the
EEM model is for mobile devices to communicate with hosts using
ethernet over USB. For Linux gadgets, however, the interface with
the host is the same (a usbX device), so the differences are minimal.
If you say "y" here, the Ethernet gadget driver will use the EEM
protocol rather than ECM. If unsure, say "n".
config USB_G_NCM
tristate "Network Control Model (NCM) support"
depends on NET
select CRC32
help
This driver implements USB CDC NCM subclass standard. NCM is
an advanced protocol for Ethernet encapsulation, allows grouping
of several ethernet frames into one USB transfer and diffferent
alignment possibilities.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_ncm".
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.
Currently, this option is still labelled as EXPERIMENTAL because
of existing race conditions in the underlying in-kernel AIO core.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "gadgetfs".
config USB_FUNCTIONFS
tristate "Function Filesystem (EXPERIMENTAL)"
depends on EXPERIMENTAL
select USB_FUNCTIONFS_GENERIC if !(USB_FUNCTIONFS_ETH || USB_FUNCTIONFS_RNDIS)
help
The Function Filesystem (FunctionFS) lets one create USB
composite functions in user space in the same way GadgetFS
lets one create USB gadgets in user space. This allows creation
of composite gadgets such that some of the functions are
implemented in kernel space (for instance Ethernet, serial or
mass storage) and other are implemented in user space.
If you say "y" or "m" here you will be able what kind of
configurations the gadget will provide.
Say "y" to link the driver statically, or "m" to build
a dynamically linked module called "g_ffs".
config USB_FUNCTIONFS_ETH
bool "Include configuration with CDC ECM (Ethernet)"
depends on USB_FUNCTIONFS && NET
help
Include a configuration with CDC ECM function (Ethernet) and the
Function Filesystem.
config USB_FUNCTIONFS_RNDIS
bool "Include configuration with RNDIS (Ethernet)"
depends on USB_FUNCTIONFS && NET
help
Include a configuration with RNDIS function (Ethernet) and the Filesystem.
config USB_FUNCTIONFS_GENERIC
bool "Include 'pure' configuration"
depends on USB_FUNCTIONFS
help
Include a configuration with the Function Filesystem alone with
no Ethernet interface.
config USB_FILE_STORAGE
tristate "File-backed Storage Gadget (DEPRECATED)"
depends on BLOCK
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".
NOTE: This driver is deprecated. Its replacement is the
Mass Storage Gadget.
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_MASS_STORAGE
tristate "Mass Storage Gadget"
depends on BLOCK
help
The Mass 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 or sysfs option.
This driver is an updated replacement for the deprecated
File-backed Storage Gadget (g_file_storage).
Say "y" to link the driver statically, or "m" to build
a dynamically linked module called "g_mass_storage".
config USB_G_SERIAL
tristate "Serial Gadget (with CDC ACM and CDC OBEX 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.
This driver also supports a CDC-OBEX option. You will need a
user space OBEX server talking to /dev/ttyGS*, since the kernel
itself doesn't implement the OBEX protocol.
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 CDC ACM.
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".
config USB_G_PRINTER
tristate "Printer Gadget"
help
The Printer Gadget channels data between the USB host and a
userspace program driving the print engine. The user space
program reads and writes the device file /dev/g_printer to
receive or send printer data. It can use ioctl calls to
the device file to get or set printer status.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_printer".
For more information, see Documentation/usb/gadget_printer.txt
which includes sample code for accessing the device file.
config USB_CDC_COMPOSITE
tristate "CDC Composite Device (Ethernet and ACM)"
depends on NET
help
This driver provides two functions in one configuration:
a CDC Ethernet (ECM) link, and a CDC ACM (serial port) link.
This driver requires four bulk and two interrupt endpoints,
plus the ability to handle altsettings. Not all peripheral
controllers are that capable.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module.
config USB_G_NOKIA
tristate "Nokia composite gadget"
depends on PHONET
help
The Nokia composite gadget provides support for acm, obex
and phonet in only one composite gadget driver.
It's only really useful for N900 hardware. If you're building
a kernel for N900, say Y or M here. If unsure, say N.
config USB_G_MULTI
tristate "Multifunction Composite Gadget (EXPERIMENTAL)"
depends on BLOCK && NET
select USB_G_MULTI_CDC if !USB_G_MULTI_RNDIS
help
The Multifunction Composite Gadget provides Ethernet (RNDIS
and/or CDC Ethernet), mass storage and ACM serial link
interfaces.
You will be asked to choose which of the two configurations is
to be available in the gadget. At least one configuration must
be chosen to make the gadget usable. Selecting more than one
configuration will prevent Windows from automatically detecting
the gadget as a composite gadget, so an INF file will be needed to
use the gadget.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_multi".
config USB_G_MULTI_RNDIS
bool "RNDIS + CDC Serial + Storage configuration"
depends on USB_G_MULTI
default y
help
This option enables a configuration with RNDIS, CDC Serial and
Mass Storage functions available in the Multifunction Composite
Gadget. This is the configuration dedicated for Windows since RNDIS
is Microsoft's protocol.
If unsure, say "y".
config USB_G_MULTI_CDC
bool "CDC Ethernet + CDC Serial + Storage configuration"
depends on USB_G_MULTI
default n
help
This option enables a configuration with CDC Ethernet (ECM), CDC
Serial and Mass Storage functions available in the Multifunction
Composite Gadget.
If unsure, say "y".
config USB_G_HID
tristate "HID Gadget"
help
The HID gadget driver provides generic emulation of USB
Human Interface Devices (HID).
For more information, see Documentation/usb/gadget_hid.txt which
includes sample code for accessing the device files.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_hid".
config USB_G_DBGP
tristate "EHCI Debug Device Gadget"
help
This gadget emulates an EHCI Debug device. This is useful when you want
to interact with an EHCI Debug Port.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_dbgp".
if USB_G_DBGP
choice
prompt "EHCI Debug Device mode"
default USB_G_DBGP_SERIAL
config USB_G_DBGP_PRINTK
depends on USB_G_DBGP
bool "printk"
help
Directly printk() received data. No interaction.
config USB_G_DBGP_SERIAL
depends on USB_G_DBGP
bool "serial"
help
Userland can interact using /dev/ttyGSxxx.
endchoice
endif
# put drivers that need isochronous transfer support (for audio
# or video class gadget drivers), or specific hardware, here.
config USB_G_WEBCAM
tristate "USB Webcam Gadget"
depends on VIDEO_DEV
help
The Webcam Gadget acts as a composite USB Audio and Video Class
device. It provides a userspace API to process UVC control requests
and stream video data to the host.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_webcam".
endchoice
endif # USB_GADGET
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