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linux_dsm_epyc7002/drivers/usb/gadget/legacy/Kconfig
Masahiro Yamada df8df5e4bc usb: get rid of 'choice' for legacy gadget drivers 
drivers/usb/gadget/legacy/Kconfig creates a 'choice' inside another
'choice'.

The outer choice: line 17 "USB Gadget precomposed configurations"
The inner choice: line 484 "EHCI Debug Device mode"

I wondered why the whole legacy gadget drivers reside in such a big
choice block.

This dates back to 2003, "[PATCH] USB: fix for multiple definition of
`usb_gadget_get_string'". [1]

At that time, the global function, usb_gadget_get_string(), was linked
into multiple drivers. That was why only one driver was able to become
built-in at the same time.

Later, commit a84d9e5361 ("usb: gadget: start with libcomposite")
moved usb_gadget_get_string() to a separate module, libcomposite.ko
instead of including usbstring.c from multiple modules.

More and more refactoring was done, and after commit 1bcce93947
("usb: gadget: multi: convert to new interface of f_mass_storage"),
you can link multiple gadget drivers into vmlinux without causing
multiple definition error.

This is the only user of the nested choice structure ever. Removing
this mess will make some Kconfig cleanups possible.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=fee4cf49a81381e072c063571d1aadbb29207408

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Felipe Balbi <balbi@kernel.org>
Link: https://lore.kernel.org/r/20200315154948.26569-1-masahiroy@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-03-16 08:36:35 +01:00

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# SPDX-License-Identifier: GPL-2.0
#
# 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).
#
# 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.
#
# The available choices each represent a single precomposed USB
# gadget configuration. In the device model, each option contains
# both the device instantiation as a child for a USB gadget
# controller, and the relevant drivers for each function declared
# by the device.
menu "USB Gadget precomposed configurations"
config USB_ZERO
tristate "Gadget Zero (DEVELOPMENT)"
select USB_LIBCOMPOSITE
select USB_F_SS_LB
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
bool "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"
depends on SND
select USB_LIBCOMPOSITE
select SND_PCM
select USB_F_UAC1 if (GADGET_UAC1 && !GADGET_UAC1_LEGACY)
select USB_F_UAC1_LEGACY if (GADGET_UAC1 && GADGET_UAC1_LEGACY)
select USB_F_UAC2 if !GADGET_UAC1
select USB_U_AUDIO if (USB_F_UAC2 || USB_F_UAC1)
help
This Gadget Audio driver is compatible with USB Audio Class
specification 2.0. It implements 1 AudioControl interface,
1 AudioStreaming Interface each for USB-OUT and USB-IN.
Number of channels, sample rate and sample size can be
specified as module parameters.
This driver doesn't expect any real Audio codec to be present
on the device - the audio streams are simply sinked to and
sourced from a virtual ALSA sound card created. The user-space
application may choose to do whatever it wants with the data
received from the USB Host and choose to provide whatever it
wants as audio data to the USB Host.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_audio".
config GADGET_UAC1
bool "UAC 1.0"
depends on USB_AUDIO
help
If you instead want older USB Audio Class specification 1.0 support
with similar driver capabilities.
config GADGET_UAC1_LEGACY
bool "UAC 1.0 (Legacy)"
depends on GADGET_UAC1
help
If you instead want legacy UAC Spec-1.0 driver that also has audio
paths hardwired to the Audio codec chip on-board and doesn't work
without one.
config USB_ETH
tristate "Ethernet Gadget (with CDC Ethernet support)"
depends on NET
select USB_LIBCOMPOSITE
select USB_U_ETHER
select USB_F_ECM
select USB_F_SUBSET
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 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
select USB_LIBCOMPOSITE
select USB_F_RNDIS
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
select USB_LIBCOMPOSITE
select USB_F_EEM
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 USB_LIBCOMPOSITE
select USB_U_ETHER
select USB_F_NCM
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 different
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"
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_FUNCTIONFS
tristate "Function Filesystem"
select USB_LIBCOMPOSITE
select USB_F_FS
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
select USB_U_ETHER
select USB_F_ECM
select USB_F_SUBSET
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
select USB_U_ETHER
select USB_F_RNDIS
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_MASS_STORAGE
tristate "Mass Storage Gadget"
depends on BLOCK
select USB_LIBCOMPOSITE
select USB_F_MASS_STORAGE
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 a replacement for now removed 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_GADGET_TARGET
tristate "USB Gadget Target Fabric Module"
depends on TARGET_CORE
select USB_LIBCOMPOSITE
select USB_F_TCM
help
This fabric is an USB gadget. Two USB protocols are supported that is
BBB or BOT (Bulk Only Transport) and UAS (USB Attached SCSI). BOT is
advertised on alternative interface 0 (primary) and UAS is on
alternative interface 1. Both protocols can work on USB2.0 and USB3.0.
UAS utilizes the USB 3.0 feature called streams support.
config USB_G_SERIAL
tristate "Serial Gadget (with CDC ACM and CDC OBEX support)"
depends on TTY
select USB_U_SERIAL
select USB_F_ACM
select USB_F_SERIAL
select USB_F_OBEX
select USB_LIBCOMPOSITE
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.rst
which includes instructions and a "driver info file" needed to
make MS-Windows work with CDC ACM.
config USB_MIDI_GADGET
tristate "MIDI Gadget"
depends on SND
select USB_LIBCOMPOSITE
select SND_RAWMIDI
select USB_F_MIDI
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"
select USB_LIBCOMPOSITE
select USB_F_PRINTER
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.rst
which includes sample code for accessing the device file.
if TTY
config USB_CDC_COMPOSITE
tristate "CDC Composite Device (Ethernet and ACM)"
depends on NET
select USB_LIBCOMPOSITE
select USB_U_SERIAL
select USB_U_ETHER
select USB_F_ACM
select USB_F_ECM
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
depends on BLOCK
select USB_LIBCOMPOSITE
select USB_U_SERIAL
select USB_U_ETHER
select USB_F_ACM
select USB_F_OBEX
select USB_F_PHONET
select USB_F_ECM
select USB_F_MASS_STORAGE
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_ACM_MS
tristate "CDC Composite Device (ACM and mass storage)"
depends on BLOCK
select USB_LIBCOMPOSITE
select USB_U_SERIAL
select USB_F_ACM
select USB_F_MASS_STORAGE
help
This driver provides two functions in one configuration:
a mass storage, and a CDC ACM (serial port) link.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_acm_ms".
config USB_G_MULTI
tristate "Multifunction Composite Gadget"
depends on BLOCK && NET
select USB_G_MULTI_CDC if !USB_G_MULTI_RNDIS
select USB_LIBCOMPOSITE
select USB_U_SERIAL
select USB_U_ETHER
select USB_F_ACM
select USB_F_MASS_STORAGE
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
select USB_F_RNDIS
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
select USB_F_ECM
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".
endif # TTY
config USB_G_HID
tristate "HID Gadget"
select USB_LIBCOMPOSITE
select USB_F_HID
help
The HID gadget driver provides generic emulation of USB
Human Interface Devices (HID).
For more information, see Documentation/usb/gadget_hid.rst 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".
# Standalone / single function gadgets
config USB_G_DBGP
tristate "EHCI Debug Device Gadget"
depends on TTY
select USB_LIBCOMPOSITE
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
select USB_U_SERIAL
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_V4L2
select USB_LIBCOMPOSITE
select VIDEOBUF2_VMALLOC
select USB_F_UVC
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".
config USB_RAW_GADGET
tristate "USB Raw Gadget"
help
USB Raw Gadget is a kernel module that provides a userspace interface
for the USB Gadget subsystem. Essentially it allows to emulate USB
devices from userspace. See Documentation/usb/raw-gadget.rst for
details.
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "raw_gadget".
endmenu
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