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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-23 04:34:11 +08:00
linux-next/Documentation/usb
Andrey Konovalov f2c2e71764 usb: gadget: add raw-gadget interface
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. Enabled with CONFIG_USB_RAW_GADGET. Raw Gadget is
currently a strictly debugging feature and shouldn't be used in
production.

Raw Gadget is similar to GadgetFS, but provides a more low-level and
direct access to the USB Gadget layer for the userspace. The key
differences are:

1. Every USB request is passed to the userspace to get a response, while
   GadgetFS responds to some USB requests internally based on the provided
   descriptors. However note, that the UDC driver might respond to some
   requests on its own and never forward them to the Gadget layer.

2. GadgetFS performs some sanity checks on the provided USB descriptors,
   while Raw Gadget allows you to provide arbitrary data as responses to
   USB requests.

3. Raw Gadget provides a way to select a UDC device/driver to bind to,
   while GadgetFS currently binds to the first available UDC.

4. Raw Gadget uses predictable endpoint names (handles) across different
   UDCs (as long as UDCs have enough endpoints of each required transfer
   type).

5. Raw Gadget has ioctl-based interface instead of a filesystem-based one.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-03-15 11:34:48 +02:00
..
acm.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
authorization.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
chipidea.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
CREDITS documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
dwc3.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
ehci.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
functionfs.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
gadget_configfs.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
gadget_hid.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
gadget_multi.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
gadget_printer.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
gadget_serial.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
gadget-testing.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
index.rst usb: gadget: add raw-gadget interface 2020-03-15 11:34:48 +02:00
iuu_phoenix.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
linux-cdc-acm.inf USB: linux-cdc-acm.inf: add support for the acm_ms gadget 2011-11-29 09:59:29 +09:00
linux.inf USB: gadget: g_multi: fixed vendor and product ID in inf files 2011-04-29 16:45:22 -07:00
mass-storage.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
misc_usbsevseg.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
mtouchusb.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
ohci.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
raw-gadget.rst usb: gadget: add raw-gadget interface 2020-03-15 11:34:48 +02:00
text_files.rst docs: usb: remove some broken references 2020-01-28 13:41:22 -07:00
usb-help.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
usb-serial.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
usbdevfs-drop-permissions.c usb: devio: Add ioctl to disallow detaching kernel USB drivers. 2016-03-05 12:05:01 -08:00
usbip_protocol.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
usbmon.rst docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00