drivers/usb/gadget/Kconfig

   1 #
   2 # USB Gadget support on a system involves
   3 #    (a) a peripheral controller, and
   4 #    (b) the gadget driver using it.
   5 #
   6 # NOTE:  Gadget support ** DOES NOT ** depend on host-side CONFIG_USB !!
   7 #
   8 #  - Host systems (like PCs) need CONFIG_USB (with "A" jacks).
   9 #  - Peripherals (like PDAs) need CONFIG_USB_GADGET (with "B" jacks).
  10 #  - Some systems have both kinds of controllers.
  11 #
  12 # With help from a special transceiver and a "Mini-AB" jack, systems with
  13 # both kinds of controller can also support "USB On-the-Go" (CONFIG_USB_OTG).
  14 #
  15
  16 menuconfig USB_GADGET
  17         tristate "USB Gadget Support"
  18         help
  19            USB is a master/slave protocol, organized with one master
  20            host (such as a PC) controlling up to 127 peripheral devices.
  21            The USB hardware is asymmetric, which makes it easier to set up:
  22            you can't connect a "to-the-host" connector to a peripheral.
  23
  24            Linux can run in the host, or in the peripheral.  In both cases
  25            you need a low level bus controller driver, and some software
  26            talking to it.  Peripheral controllers are often discrete silicon,
  27            or are integrated with the CPU in a microcontroller.  The more
  28            familiar host side controllers have names like "EHCI", "OHCI",
  29            or "UHCI", and are usually integrated into southbridges on PC
  30            motherboards.
  31
  32            Enable this configuration option if you want to run Linux inside
  33            a USB peripheral device.  Configure one hardware driver for your
  34            peripheral/device side bus controller, and a "gadget driver" for
  35            your peripheral protocol.  (If you use modular gadget drivers,
  36            you may configure more than one.)
  37
  38            If in doubt, say "N" and don't enable these drivers; most people
  39            don't have this kind of hardware (except maybe inside Linux PDAs).
  40
  41            For more information, see <http://www.linux-usb.org/gadget> and
  42            the kernel DocBook documentation for this API.
  43
  44 if USB_GADGET
  45
  46 config USB_GADGET_DEBUG
  47         boolean "Debugging messages (DEVELOPMENT)"
  48         depends on DEBUG_KERNEL
  49         help
  50            Many controller and gadget drivers will print some debugging
  51            messages if you use this option to ask for those messages.
  52
  53            Avoid enabling these messages, even if you're actively
  54            debugging such a driver.  Many drivers will emit so many
  55            messages that the driver timings are affected, which will
  56            either create new failure modes or remove the one you're
  57            trying to track down.  Never enable these messages for a
  58            production build.
  59
  60 config USB_GADGET_DEBUG_FILES
  61         boolean "Debugging information files (DEVELOPMENT)"
  62         depends on PROC_FS
  63         help
  64            Some of the drivers in the "gadget" framework can expose
  65            debugging information in files such as /proc/driver/udc
  66            (for a peripheral controller).  The information in these
  67            files may help when you're troubleshooting or bringing up a
  68            driver on a new board.   Enable these files by choosing "Y"
  69            here.  If in doubt, or to conserve kernel memory, say "N".
  70
  71 config USB_GADGET_DEBUG_FS
  72         boolean "Debugging information files in debugfs (DEVELOPMENT)"
  73         depends on DEBUG_FS
  74         help
  75            Some of the drivers in the "gadget" framework can expose
  76            debugging information in files under /sys/kernel/debug/.
  77            The information in these files may help when you're
  78            troubleshooting or bringing up a driver on a new board.
  79            Enable these files by choosing "Y" here.  If in doubt, or
  80            to conserve kernel memory, say "N".
  81
  82 config USB_GADGET_VBUS_DRAW
  83         int "Maximum VBUS Power usage (2-500 mA)"
  84         range 2 500
  85         default 2
  86         help
  87            Some devices need to draw power from USB when they are
  88            configured, perhaps to operate circuitry or to recharge
  89            batteries.  This is in addition to any local power supply,
  90            such as an AC adapter or batteries.
  91
  92            Enter the maximum power your device draws through USB, in
  93            milliAmperes.  The permitted range of values is 2 - 500 mA;
  94            0 mA would be legal, but can make some hosts misbehave.
  95
  96            This value will be used except for system-specific gadget
  97            drivers that have more specific information.
  98
  99 config  USB_GADGET_SELECTED
 100         boolean
 101
 102 #
 103 # USB Peripheral Controller Support
 104 #
 105 # The order here is alphabetical, except that integrated controllers go
 106 # before discrete ones so they will be the initial/default value:
 107 #   - integrated/SOC controllers first
 108 #   - licensed IP used in both SOC and discrete versions
 109 #   - discrete ones (including all PCI-only controllers)
 110 #   - debug/dummy gadget+hcd is last.
 111 #
 112 choice
 113         prompt "USB Peripheral Controller"
 114         depends on USB_GADGET
 115         help
 116            A USB device uses a controller to talk to its host.
 117            Systems should have only one such upstream link.
 118            Many controller drivers are platform-specific; these
 119            often need board-specific hooks.
 120
 121 #
 122 # Integrated controllers
 123 #
 124
 125 config USB_GADGET_AT91
 126         boolean "Atmel AT91 USB Device Port"
 127         depends on ARCH_AT91 && !ARCH_AT91SAM9RL && !ARCH_AT91CAP9
 128         select USB_GADGET_SELECTED
 129         help
 130            Many Atmel AT91 processors (such as the AT91RM2000) have a
 131            full speed USB Device Port with support for five configurable
 132            endpoints (plus endpoint zero).
 133
 134            Say "y" to link the driver statically, or "m" to build a
 135            dynamically linked module called "at91_udc" and force all
 136            gadget drivers to also be dynamically linked.
 137
 138 config USB_AT91
 139         tristate
 140         depends on USB_GADGET_AT91
 141         default USB_GADGET
 142
 143 config USB_GADGET_ATMEL_USBA
 144         boolean "Atmel USBA"
 145         select USB_GADGET_DUALSPEED
 146         depends on AVR32 || ARCH_AT91CAP9 || ARCH_AT91SAM9RL
 147         help
 148           USBA is the integrated high-speed USB Device controller on
 149           the AT32AP700x, some AT91SAM9 and AT91CAP9 processors from Atmel.
 150
 151 config USB_ATMEL_USBA
 152         tristate
 153         depends on USB_GADGET_ATMEL_USBA
 154         default USB_GADGET
 155         select USB_GADGET_SELECTED
 156
 157 config USB_GADGET_FSL_USB2
 158         boolean "Freescale Highspeed USB DR Peripheral Controller"
 159         depends on FSL_SOC || ARCH_MXC
 160         select USB_GADGET_DUALSPEED
 161         help
 162            Some of Freescale PowerPC processors have a High Speed
 163            Dual-Role(DR) USB controller, which supports device mode.
 164
 165            The number of programmable endpoints is different through
 166            SOC revisions.
 167
 168            Say "y" to link the driver statically, or "m" to build a
 169            dynamically linked module called "fsl_usb2_udc" and force
 170            all gadget drivers to also be dynamically linked.
 171
 172 config USB_FSL_USB2
 173         tristate
 174         depends on USB_GADGET_FSL_USB2
 175         default USB_GADGET
 176         select USB_GADGET_SELECTED
 177
 178 config USB_GADGET_LH7A40X
 179         boolean "LH7A40X"
 180         depends on ARCH_LH7A40X
 181         help
 182            This driver provides USB Device Controller driver for LH7A40x
 183
 184 config USB_LH7A40X
 185         tristate
 186         depends on USB_GADGET_LH7A40X
 187         default USB_GADGET
 188         select USB_GADGET_SELECTED
 189
 190 config USB_GADGET_OMAP
 191         boolean "OMAP USB Device Controller"
 192         depends on ARCH_OMAP
 193         select ISP1301_OMAP if MACH_OMAP_H2 || MACH_OMAP_H3 || MACH_OMAP_H4_OTG
 194         select USB_OTG_UTILS if ARCH_OMAP
 195         help
 196            Many Texas Instruments OMAP processors have flexible full
 197            speed USB device controllers, with support for up to 30
 198            endpoints (plus endpoint zero).  This driver supports the
 199            controller in the OMAP 1611, and should work with controllers
 200            in other OMAP processors too, given minor tweaks.
 201
 202            Say "y" to link the driver statically, or "m" to build a
 203            dynamically linked module called "omap_udc" and force all
 204            gadget drivers to also be dynamically linked.
 205
 206 config USB_OMAP
 207         tristate
 208         depends on USB_GADGET_OMAP
 209         default USB_GADGET
 210         select USB_GADGET_SELECTED
 211
 212 config USB_OTG
 213         boolean "OTG Support"
 214         depends on USB_GADGET_OMAP && ARCH_OMAP_OTG && USB_OHCI_HCD
 215         help
 216            The most notable feature of USB OTG is support for a
 217            "Dual-Role" device, which can act as either a device
 218            or a host.  The initial role choice can be changed
 219            later, when two dual-role devices talk to each other.
 220
 221            Select this only if your OMAP board has a Mini-AB connector.
 222
 223 config USB_GADGET_PXA25X
 224         boolean "PXA 25x or IXP 4xx"
 225         depends on (ARCH_PXA && PXA25x) || ARCH_IXP4XX
 226         help
 227            Intel's PXA 25x series XScale ARM-5TE processors include
 228            an integrated full speed USB 1.1 device controller.  The
 229            controller in the IXP 4xx series is register-compatible.
 230
 231            It has fifteen fixed-function endpoints, as well as endpoint
 232            zero (for control transfers).
 233
 234            Say "y" to link the driver statically, or "m" to build a
 235            dynamically linked module called "pxa25x_udc" and force all
 236            gadget drivers to also be dynamically linked.
 237
 238 config USB_PXA25X
 239         tristate
 240         depends on USB_GADGET_PXA25X
 241         default USB_GADGET
 242         select USB_GADGET_SELECTED
 243
 244 # if there's only one gadget driver, using only two bulk endpoints,
 245 # don't waste memory for the other endpoints
 246 config USB_PXA25X_SMALL
 247         depends on USB_GADGET_PXA25X
 248         bool
 249         default n if USB_ETH_RNDIS
 250         default y if USB_ZERO
 251         default y if USB_ETH
 252         default y if USB_G_SERIAL
 253
 254 config USB_GADGET_PXA27X
 255         boolean "PXA 27x"
 256         depends on ARCH_PXA && (PXA27x || PXA3xx)
 257         select USB_OTG_UTILS
 258         help
 259            Intel's PXA 27x series XScale ARM v5TE processors include
 260            an integrated full speed USB 1.1 device controller.
 261
 262            It has up to 23 endpoints, as well as endpoint zero (for
 263            control transfers).
 264
 265            Say "y" to link the driver statically, or "m" to build a
 266            dynamically linked module called "pxa27x_udc" and force all
 267            gadget drivers to also be dynamically linked.
 268
 269 config USB_PXA27X
 270         tristate
 271         depends on USB_GADGET_PXA27X
 272         default USB_GADGET
 273         select USB_GADGET_SELECTED
 274
 275 config USB_GADGET_S3C_HSOTG
 276         boolean "S3C HS/OtG USB Device controller"
 277         depends on S3C_DEV_USB_HSOTG
 278         select USB_GADGET_S3C_HSOTG_PIO
 279         help
 280           The Samsung S3C64XX USB2.0 high-speed gadget controller
 281           integrated into the S3C64XX series SoC.
 282
 283 config USB_S3C_HSOTG
 284         tristate
 285         depends on USB_GADGET_S3C_HSOTG
 286         default USB_GADGET
 287         select USB_GADGET_SELECTED
 288
 289 config USB_GADGET_S3C2410
 290         boolean "S3C2410 USB Device Controller"
 291         depends on ARCH_S3C2410
 292         help
 293           Samsung's S3C2410 is an ARM-4 processor with an integrated
 294           full speed USB 1.1 device controller.  It has 4 configurable
 295           endpoints, as well as endpoint zero (for control transfers).
 296
 297           This driver has been tested on the S3C2410, S3C2412, and
 298           S3C2440 processors.
 299
 300 config USB_S3C2410
 301         tristate
 302         depends on USB_GADGET_S3C2410
 303         default USB_GADGET
 304         select USB_GADGET_SELECTED
 305
 306 config USB_S3C2410_DEBUG
 307         boolean "S3C2410 udc debug messages"
 308         depends on USB_GADGET_S3C2410
 309
 310 #
 311 # Controllers available in both integrated and discrete versions
 312 #
 313
 314 # musb builds in ../musb along with host support
 315 config USB_GADGET_MUSB_HDRC
 316         boolean "Inventra HDRC USB Peripheral (TI, ADI, ...)"
 317         depends on USB_MUSB_HDRC && (USB_MUSB_PERIPHERAL || USB_MUSB_OTG)
 318         select USB_GADGET_DUALSPEED
 319         select USB_GADGET_SELECTED
 320         help
 321           This OTG-capable silicon IP is used in dual designs including
 322           the TI DaVinci, OMAP 243x, OMAP 343x, TUSB 6010, and ADI Blackfin
 323
 324 config USB_GADGET_IMX
 325         boolean "Freescale IMX USB Peripheral Controller"
 326         depends on ARCH_MX1
 327         help
 328            Freescale's IMX series include an integrated full speed
 329            USB 1.1 device controller.  The controller in the IMX series
 330            is register-compatible.
 331
 332            It has Six fixed-function endpoints, as well as endpoint
 333            zero (for control transfers).
 334
 335            Say "y" to link the driver statically, or "m" to build a
 336            dynamically linked module called "imx_udc" and force all
 337            gadget drivers to also be dynamically linked.
 338
 339 config USB_IMX
 340         tristate
 341         depends on USB_GADGET_IMX
 342         default USB_GADGET
 343         select USB_GADGET_SELECTED
 344
 345 config USB_GADGET_M66592
 346         boolean "Renesas M66592 USB Peripheral Controller"
 347         select USB_GADGET_DUALSPEED
 348         help
 349            M66592 is a discrete USB peripheral controller chip that
 350            supports both full and high speed USB 2.0 data transfers.
 351            It has seven configurable endpoints, and endpoint zero.
 352
 353            Say "y" to link the driver statically, or "m" to build a
 354            dynamically linked module called "m66592_udc" and force all
 355            gadget drivers to also be dynamically linked.
 356
 357 config USB_M66592
 358         tristate
 359         depends on USB_GADGET_M66592
 360         default USB_GADGET
 361         select USB_GADGET_SELECTED
 362
 363 config SUPERH_BUILT_IN_M66592
 364         boolean "Enable SuperH built-in USB like the M66592"
 365         depends on USB_GADGET_M66592 && CPU_SUBTYPE_SH7722
 366         help
 367            SH7722 has USB like the M66592.
 368
 369            The transfer rate is very slow when use "Ethernet Gadget".
 370            However, this problem is improved if change a value of
 371            NET_IP_ALIGN to 4.
 372
 373 #
 374 # Controllers available only in discrete form (and all PCI controllers)
 375 #
 376
 377 config USB_GADGET_AMD5536UDC
 378         boolean "AMD5536 UDC"
 379         depends on PCI
 380         select USB_GADGET_DUALSPEED
 381         help
 382            The AMD5536 UDC is part of the AMD Geode CS5536, an x86 southbridge.
 383            It is a USB Highspeed DMA capable USB device controller. Beside ep0
 384            it provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
 385            The UDC port supports OTG operation, and may be used as a host port
 386            if it's not being used to implement peripheral or OTG roles.
 387
 388            Say "y" to link the driver statically, or "m" to build a
 389            dynamically linked module called "amd5536udc" and force all
 390            gadget drivers to also be dynamically linked.
 391
 392 config USB_AMD5536UDC
 393         tristate
 394         depends on USB_GADGET_AMD5536UDC
 395         default USB_GADGET
 396         select USB_GADGET_SELECTED
 397
 398 config USB_GADGET_FSL_QE
 399         boolean "Freescale QE/CPM USB Device Controller"
 400         depends on FSL_SOC && (QUICC_ENGINE || CPM)
 401         help
 402            Some of Freescale PowerPC processors have a Full Speed
 403            QE/CPM2 USB controller, which support device mode with 4
 404            programmable endpoints. This driver supports the
 405            controller in the MPC8360 and MPC8272, and should work with
 406            controllers having QE or CPM2, given minor tweaks.
 407
 408            Set CONFIG_USB_GADGET to "m" to build this driver as a
 409            dynamically linked module called "fsl_qe_udc".
 410
 411 config USB_FSL_QE
 412         tristate
 413         depends on USB_GADGET_FSL_QE
 414         default USB_GADGET
 415         select USB_GADGET_SELECTED
 416
 417 config USB_GADGET_CI13XXX
 418         boolean "MIPS USB CI13xxx"
 419         depends on PCI
 420         select USB_GADGET_DUALSPEED
 421         help
 422           MIPS USB IP core family device controller
 423           Currently it only supports IP part number CI13412
 424
 425           Say "y" to link the driver statically, or "m" to build a
 426           dynamically linked module called "ci13xxx_udc" and force all
 427           gadget drivers to also be dynamically linked.
 428
 429 config USB_CI13XXX
 430         tristate
 431         depends on USB_GADGET_CI13XXX
 432         default USB_GADGET
 433         select USB_GADGET_SELECTED
 434
 435 config USB_GADGET_NET2280
 436         boolean "NetChip 228x"
 437         depends on PCI
 438         select USB_GADGET_DUALSPEED
 439         help
 440            NetChip 2280 / 2282 is a PCI based USB peripheral controller which
 441            supports both full and high speed USB 2.0 data transfers.
 442
 443            It has six configurable endpoints, as well as endpoint zero
 444            (for control transfers) and several endpoints with dedicated
 445            functions.
 446
 447            Say "y" to link the driver statically, or "m" to build a
 448            dynamically linked module called "net2280" and force all
 449            gadget drivers to also be dynamically linked.
 450
 451 config USB_NET2280
 452         tristate
 453         depends on USB_GADGET_NET2280
 454         default USB_GADGET
 455         select USB_GADGET_SELECTED
 456
 457 config USB_GADGET_GOKU
 458         boolean "Toshiba TC86C001 'Goku-S'"
 459         depends on PCI
 460         help
 461            The Toshiba TC86C001 is a PCI device which includes controllers
 462            for full speed USB devices, IDE, I2C, SIO, plus a USB host (OHCI).
 463
 464            The device controller has three configurable (bulk or interrupt)
 465            endpoints, plus endpoint zero (for control transfers).
 466
 467            Say "y" to link the driver statically, or "m" to build a
 468            dynamically linked module called "goku_udc" and to force all
 469            gadget drivers to also be dynamically linked.
 470
 471 config USB_GOKU
 472         tristate
 473         depends on USB_GADGET_GOKU
 474         default USB_GADGET
 475         select USB_GADGET_SELECTED
 476
 477 config USB_GADGET_LANGWELL
 478         boolean "Intel Langwell USB Device Controller"
 479         depends on PCI
 480         select USB_GADGET_DUALSPEED
 481         help
 482            Intel Langwell USB Device Controller is a High-Speed USB
 483            On-The-Go device controller.
 484
 485            The number of programmable endpoints is different through
 486            controller revision.
 487
 488            Say "y" to link the driver statically, or "m" to build a
 489            dynamically linked module called "langwell_udc" and force all
 490            gadget drivers to also be dynamically linked.
 491
 492 config USB_LANGWELL
 493         tristate
 494         depends on USB_GADGET_LANGWELL
 495         default USB_GADGET
 496         select USB_GADGET_SELECTED
 497
 498
 499 #
 500 # LAST -- dummy/emulated controller
 501 #
 502
 503 config USB_GADGET_DUMMY_HCD
 504         boolean "Dummy HCD (DEVELOPMENT)"
 505         depends on USB=y || (USB=m && USB_GADGET=m)
 506         select USB_GADGET_DUALSPEED
 507         help
 508           This host controller driver emulates USB, looping all data transfer
 509           requests back to a USB "gadget driver" in the same host.  The host
 510           side is the master; the gadget side is the slave.  Gadget drivers
 511           can be high, full, or low speed; and they have access to endpoints
 512           like those from NET2280, PXA2xx, or SA1100 hardware.
 513
 514           This may help in some stages of creating a driver to embed in a
 515           Linux device, since it lets you debug several parts of the gadget
 516           driver without its hardware or drivers being involved.
 517
 518           Since such a gadget side driver needs to interoperate with a host
 519           side Linux-USB device driver, this may help to debug both sides
 520           of a USB protocol stack.
 521
 522           Say "y" to link the driver statically, or "m" to build a
 523           dynamically linked module called "dummy_hcd" and force all
 524           gadget drivers to also be dynamically linked.
 525
 526 config USB_DUMMY_HCD
 527         tristate
 528         depends on USB_GADGET_DUMMY_HCD
 529         default USB_GADGET
 530         select USB_GADGET_SELECTED
 531
 532 # NOTE:  Please keep dummy_hcd LAST so that "real hardware" appears
 533 # first and will be selected by default.
 534
 535 endchoice
 536
 537 config USB_GADGET_DUALSPEED
 538         bool
 539         depends on USB_GADGET
 540         default n
 541         help
 542           Means that gadget drivers should include extra descriptors
 543           and code to handle dual-speed controllers.
 544
 545 #
 546 # USB Gadget Drivers
 547 #
 548 choice
 549         tristate "USB Gadget Drivers"
 550         depends on USB_GADGET && USB_GADGET_SELECTED
 551         default USB_ETH
 552         help
 553           A Linux "Gadget Driver" talks to the USB Peripheral Controller
 554           driver through the abstract "gadget" API.  Some other operating
 555           systems call these "client" drivers, of which "class drivers"
 556           are a subset (implementing a USB device class specification).
 557           A gadget driver implements one or more USB functions using
 558           the peripheral hardware.
 559
 560           Gadget drivers are hardware-neutral, or "platform independent",
 561           except that they sometimes must understand quirks or limitations
 562           of the particular controllers they work with.  For example, when
 563           a controller doesn't support alternate configurations or provide
 564           enough of the right types of endpoints, the gadget driver might
 565           not be able work with that controller, or might need to implement
 566           a less common variant of a device class protocol.
 567
 568 # this first set of drivers all depend on bulk-capable hardware.
 569
 570 config USB_ZERO
 571         tristate "Gadget Zero (DEVELOPMENT)"
 572         help
 573           Gadget Zero is a two-configuration device.  It either sinks and
 574           sources bulk data; or it loops back a configurable number of
 575           transfers.  It also implements control requests, for "chapter 9"
 576           conformance.  The driver needs only two bulk-capable endpoints, so
 577           it can work on top of most device-side usb controllers.  It's
 578           useful for testing, and is also a working example showing how
 579           USB "gadget drivers" can be written.
 580
 581           Make this be the first driver you try using on top of any new
 582           USB peripheral controller driver.  Then you can use host-side
 583           test software, like the "usbtest" driver, to put your hardware
 584           and its driver through a basic set of functional tests.
 585
 586           Gadget Zero also works with the host-side "usb-skeleton" driver,
 587           and with many kinds of host-side test software.  You may need
 588           to tweak product and vendor IDs before host software knows about
 589           this device, and arrange to select an appropriate configuration.
 590
 591           Say "y" to link the driver statically, or "m" to build a
 592           dynamically linked module called "g_zero".
 593
 594 config USB_ZERO_HNPTEST
 595         boolean "HNP Test Device"
 596         depends on USB_ZERO && USB_OTG
 597         help
 598           You can configure this device to enumerate using the device
 599           identifiers of the USB-OTG test device.  That means that when
 600           this gadget connects to another OTG device, with this one using
 601           the "B-Peripheral" role, that device will use HNP to let this
 602           one serve as the USB host instead (in the "B-Host" role).
 603
 604 config USB_AUDIO
 605         tristate "Audio Gadget (EXPERIMENTAL)"
 606         depends on SND
 607         help
 608           Gadget Audio is compatible with USB Audio Class specification 1.0.
 609           It will include at least one AudioControl interface, zero or more
 610           AudioStream interface and zero or more MIDIStream interface.
 611
 612           Gadget Audio will use on-board ALSA (CONFIG_SND) audio card to
 613           playback or capture audio stream.
 614
 615           Say "y" to link the driver statically, or "m" to build a
 616           dynamically linked module called "g_audio".
 617
 618 config USB_ETH
 619         tristate "Ethernet Gadget (with CDC Ethernet support)"
 620         depends on NET
 621         help
 622           This driver implements Ethernet style communication, in either
 623           of two ways:
 624
 625            - The "Communication Device Class" (CDC) Ethernet Control Model.
 626              That protocol is often avoided with pure Ethernet adapters, in
 627              favor of simpler vendor-specific hardware, but is widely
 628              supported by firmware for smart network devices.
 629
 630            - On hardware can't implement that protocol, a simple CDC subset
 631              is used, placing fewer demands on USB.
 632
 633           RNDIS support is a third option, more demanding than that subset.
 634
 635           Within the USB device, this gadget driver exposes a network device
 636           "usbX", where X depends on what other networking devices you have.
 637           Treat it like a two-node Ethernet link:  host, and gadget.
 638
 639           The Linux-USB host-side "usbnet" driver interoperates with this
 640           driver, so that deep I/O queues can be supported.  On 2.4 kernels,
 641           use "CDCEther" instead, if you're using the CDC option. That CDC
 642           mode should also interoperate with standard CDC Ethernet class
 643           drivers on other host operating systems.
 644
 645           Say "y" to link the driver statically, or "m" to build a
 646           dynamically linked module called "g_ether".
 647
 648 config USB_ETH_RNDIS
 649         bool "RNDIS support"
 650         depends on USB_ETH
 651         default y
 652         help
 653            Microsoft Windows XP bundles the "Remote NDIS" (RNDIS) protocol,
 654            and Microsoft provides redistributable binary RNDIS drivers for
 655            older versions of Windows.
 656
 657            If you say "y" here, the Ethernet gadget driver will try to provide
 658            a second device configuration, supporting RNDIS to talk to such
 659            Microsoft USB hosts.
 660
 661            To make MS-Windows work with this, use Documentation/usb/linux.inf
 662            as the "driver info file".  For versions of MS-Windows older than
 663            XP, you'll need to download drivers from Microsoft's website; a URL
 664            is given in comments found in that info file.
 665
 666 config USB_GADGETFS
 667         tristate "Gadget Filesystem (EXPERIMENTAL)"
 668         depends on EXPERIMENTAL
 669         help
 670           This driver provides a filesystem based API that lets user mode
 671           programs implement a single-configuration USB device, including
 672           endpoint I/O and control requests that don't relate to enumeration.
 673           All endpoints, transfer speeds, and transfer types supported by
 674           the hardware are available, through read() and write() calls.
 675
 676           Currently, this option is still labelled as EXPERIMENTAL because
 677           of existing race conditions in the underlying in-kernel AIO core.
 678
 679           Say "y" to link the driver statically, or "m" to build a
 680           dynamically linked module called "gadgetfs".
 681
 682 config USB_FILE_STORAGE
 683         tristate "File-backed Storage Gadget"
 684         depends on BLOCK
 685         help
 686           The File-backed Storage Gadget acts as a USB Mass Storage
 687           disk drive.  As its storage repository it can use a regular
 688           file or a block device (in much the same way as the "loop"
 689           device driver), specified as a module parameter.
 690
 691           Say "y" to link the driver statically, or "m" to build a
 692           dynamically linked module called "g_file_storage".
 693
 694 config USB_FILE_STORAGE_TEST
 695         bool "File-backed Storage Gadget testing version"
 696         depends on USB_FILE_STORAGE
 697         default n
 698         help
 699           Say "y" to generate the larger testing version of the
 700           File-backed Storage Gadget, useful for probing the
 701           behavior of USB Mass Storage hosts.  Not needed for
 702           normal operation.
 703
 704 config USB_G_SERIAL
 705         tristate "Serial Gadget (with CDC ACM and CDC OBEX support)"
 706         help
 707           The Serial Gadget talks to the Linux-USB generic serial driver.
 708           This driver supports a CDC-ACM module option, which can be used
 709           to interoperate with MS-Windows hosts or with the Linux-USB
 710           "cdc-acm" driver.
 711
 712           This driver also supports a CDC-OBEX option.  You will need a
 713           user space OBEX server talking to /dev/ttyGS*, since the kernel
 714           itself doesn't implement the OBEX protocol.
 715
 716           Say "y" to link the driver statically, or "m" to build a
 717           dynamically linked module called "g_serial".
 718
 719           For more information, see Documentation/usb/gadget_serial.txt
 720           which includes instructions and a "driver info file" needed to
 721           make MS-Windows work with CDC ACM.
 722
 723 config USB_MIDI_GADGET
 724         tristate "MIDI Gadget (EXPERIMENTAL)"
 725         depends on SND && EXPERIMENTAL
 726         select SND_RAWMIDI
 727         help
 728           The MIDI Gadget acts as a USB Audio device, with one MIDI
 729           input and one MIDI output. These MIDI jacks appear as
 730           a sound "card" in the ALSA sound system. Other MIDI
 731           connections can then be made on the gadget system, using
 732           ALSA's aconnect utility etc.
 733
 734           Say "y" to link the driver statically, or "m" to build a
 735           dynamically linked module called "g_midi".
 736
 737 config USB_G_PRINTER
 738         tristate "Printer Gadget"
 739         help
 740           The Printer Gadget channels data between the USB host and a
 741           userspace program driving the print engine. The user space
 742           program reads and writes the device file /dev/g_printer to
 743           receive or send printer data. It can use ioctl calls to
 744           the device file to get or set printer status.
 745
 746           Say "y" to link the driver statically, or "m" to build a
 747           dynamically linked module called "g_printer".
 748
 749           For more information, see Documentation/usb/gadget_printer.txt
 750           which includes sample code for accessing the device file.
 751
 752 config USB_CDC_COMPOSITE
 753         tristate "CDC Composite Device (Ethernet and ACM)"
 754         depends on NET
 755         help
 756           This driver provides two functions in one configuration:
 757           a CDC Ethernet (ECM) link, and a CDC ACM (serial port) link.
 758
 759           This driver requires four bulk and two interrupt endpoints,
 760           plus the ability to handle altsettings.  Not all peripheral
 761           controllers are that capable.
 762
 763           Say "y" to link the driver statically, or "m" to build a
 764           dynamically linked module.
 765
 766 # put drivers that need isochronous transfer support (for audio
 767 # or video class gadget drivers), or specific hardware, here.
 768
 769 # - none yet
 770
 771 endchoice
 772
 773 endif # USB_GADGET