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/linux/drivers/usb/gadget/function/
H A Df_acm.c1 // SPDX-License-Identifier: GPL-2.0+
3 * f_acm.c -- USB CDC serial (ACM) function driver
24 * This CDC ACM function support just wraps control functions and
25 * notifications around the generic serial-over-usb code.
27 * Because CDC ACM is standardized by the USB-IF, many host operating
28 * systems have drivers for it. Accordingly, ACM is the preferred
29 * interop solution for serial-port type connections. The control
31 * this bare-bones implementation.
33 * Note that even MS-Windows has some support for ACM. However, that
34 * support is somewhat broken because when you use ACM in a composite
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H A Du_serial.h1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * u_serial.h - interface to USB gadget "serial port"/TTY utilities
13 #include <linux/usb/cdc.h>
27 * One non-multiplexed "serial" I/O port ... there can be several of these
34 * REVISIT at least ACM could support tiocmget() if needed.
47 /* REVISIT avoid this CDC-ACM support harder ... */
48 struct usb_cdc_line_coding port_line_coding; /* 9600-8-N-1 etc */
H A Df_rndis.c1 // SPDX-License-Identifier: GPL-2.0+
3 * f_rndis.c -- RNDIS link function driver
5 * Copyright (C) 2003-2005,2008 David Brownell
6 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
29 * This function is an RNDIS Ethernet port -- a Microsoft protocol that's
30 * been promoted instead of the standard CDC Ethernet. The published RNDIS
36 * doesn't support the CDC Ethernet standard.
40 * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM
41 * (modem, not Ethernet) veneer, with those ACM descriptors being entirely
46 * There is a single technical advantage of RNDIS over CDC Ethernet, if you
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/linux/drivers/usb/gadget/legacy/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
7 # NOTE: Gadget support ** DOES NOT ** depend on host-side CONFIG_USB !!
9 # - Host systems (like PCs) need CONFIG_USB (with "A" jacks).
10 # - Peripherals (like PDAs) need CONFIG_USB_GADGET (with "B" jacks).
11 # - Some systems have both kinds of controllers.
13 # With help from a special transceiver and a "Mini-AB" jack, systems with
14 # both kinds of controller can also support "USB On-the-Go" (CONFIG_USB_OTG).
23 # Gadget drivers are hardware-neutral, or "platform independent",
44 Gadget Zero is a two-configuration device. It either sinks and
47 conformance. The driver needs only two bulk-capable endpoints, so
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H A Dcdc2.c1 // SPDX-License-Identifier: GPL-2.0+
3 * cdc2.c -- CDC Composite driver, with ECM and ACM support
17 #define DRIVER_DESC "CDC Composite Gadget"
20 /*-------------------------------------------------------------------------*/
22 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
23 * Instead: allocate your own, using normal USB-IF procedures.
27 * It's for devices with only this composite CDC configuration.
30 #define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
36 /*-------------------------------------------------------------------------*/
70 .language = 0x0409, /* en-us */
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H A Dserial.c1 // SPDX-License-Identifier: GPL-2.0+
3 * serial.c -- USB gadget serial driver
28 /*-------------------------------------------------------------------------*/
33 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
34 * Instead: allocate your own, using normal USB-IF procedures.
37 #define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
38 #define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
39 #define GS_CDC_OBEX_PRODUCT_ID 0xa4a9 /* ... as CDC-OBEX */
54 .language = 0x0409, /* en-us */
81 /*-------------------------------------------------------------------------*/
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H A Dether.c1 // SPDX-License-Identifier: GPL-2.0+
3 * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
5 * Copyright (C) 2003-2005,2008 David Brownell
6 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
26 * Ethernet gadget driver -- with CDC and non-CDC options
29 * CDC Ethernet is the standard USB solution for sending Ethernet frames
32 * this USB-IF standard as its open-systems interoperability solution;
35 * This is sometimes called "CDC ECM" (Ethernet Control Model) to support
36 * TLA-soup. "CDC ACM" (Abstract Control Model) is for modems, and a new
37 * "CDC EEM" (Ethernet Emulation Model) is starting to spread.
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/linux/Documentation/usb/
H A Dgadget_multi.rst13 with RNDIS[1] (that is Ethernet), USB CDC[2] ACM (that is serial) and
16 A CDC ECM (Ethernet) function may be turned on via a Kconfig option
18 have two configurations -- one with RNDIS and another with CDC ECM[3].
20 Please note that if you use non-standard configuration (that is enable
21 CDC ECM) you may need to change vendor and/or product ID.
26 To make use of the gadget one needs to make it work on host side --
31 ------------------
38 This is also true for two configuration set-up with RNDIS
40 configuration with CDC ECM which should work better under Linux.
43 --------------------
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H A Dgadget_serial.rst7 (updated 8-May-2008 for v2.3)
11 ----------------------
25 MA 02111-1307 USA.
35 -------------
55 --------
61 The gadget serial driver talks over USB to either a CDC ACM driver
65 --------------------------------------
66 | Host-Side CDC ACM USB Host |
68 | System | Generic USB | Driver |--------
71 -------------------------------------- |
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H A Dacm.rst2 Linux ACM driver v0.16
23 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 Should you need to contact me, the author, you can do so either by e-mail -
34 The drivers/usb/class/cdc-acm.c drivers works with USB modems and USB ISDN terminal
36 Abstract Control Model (USB CDC ACM) specification.
40 - 3Com OfficeConnect 56k
41 - 3Com Voice FaxModem Pro
42 - 3Com Sportster
43 - MultiTech MultiModem 56k
44 - Zoom 2986L FaxModem
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H A Dtext_files.rst1 Linux CDC ACM inf
2 -----------------
4 .. include:: linux-cdc-acm.inf
8 ---------
14 ---------------------------------
16 .. literalinclude:: usbdevfs-drop-permissions.c
20 -------
H A Dlinux-cdc-acm.inf1 ; Windows USB CDC ACM Setup File
7 ; <http://msdn.microsoft.com/en-us/cc300389.aspx#MLPL>.
13 ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
24 ;------------------------------------------------------------------------------
25 ; Windows 2000/XP/Vista-32bit Sections
26 ;------------------------------------------------------------------------------
51 ;------------------------------------------------------------------------------
52 ; Vista-64bit Sections
53 ;------------------------------------------------------------------------------
79 ;------------------------------------------------------------------------------
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/linux/drivers/usb/class/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
8 tristate "USB Modem (CDC ACM) support"
13 Please read <file:Documentation/usb/acm.rst> for details.
20 module will be called cdc-acm.
35 of cell phones compliant to the CDC WMC specification. You can use
39 module will be called cdc-wdm.
H A Dcdc-acm.h1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Includes for cdc-acm.c
6 * Mainly take from usbnet's cdc-ether part
32 * and proceed to issue several 1-character writes, assuming they will fit.
45 struct acm *instance;
54 struct acm *instance;
57 struct acm { struct
97 unsigned int minor; /* acm minor number */ argument
H A DMakefile1 # SPDX-License-Identifier: GPL-2.0
7 obj-$(CONFIG_USB_ACM) += cdc-acm.o
8 obj-$(CONFIG_USB_PRINTER) += usblp.o
9 obj-$(CONFIG_USB_WDM) += cdc-wdm.o
10 obj-$(CONFIG_USB_TMC) += usbtmc.o
/linux/include/uapi/linux/usb/
H A Dcdc.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
3 * USB Communications Device Class (CDC) definitions
5 * CDC says how to talk to lots of different types of network adapters,
40 /*-------------------------------------------------------------------------*/
43 * Class-Specific descriptors ... there are a couple dozen of them
62 /* "Header Functional Descriptor" from CDC spec 5.2.3.1 */
71 /* "Call Management Descriptor" from CDC spec 5.2.3.2 */
84 /* "Abstract Control Management Descriptor" from CDC spec 5.2.3.3 */
100 /* "Union Functional Descriptor" from CDC spec 5.2.3.8 */
111 /* "Country Selection Functional Descriptor" from CDC spec 5.2.3.9 */
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/linux/drivers/usb/serial/
H A Dqcaux.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
8 * Devices listed here usually provide a CDC ACM port on which normal modem
9 * AT commands and PPP can be used. But when that port is in-use by PPP it
21 /* NOTE: for now, only use this driver for devices that provide a CDC-ACM port
23 * QCDM-capable ports. Devices that do not provide a CDC-ACM port should
30 #define UTSTARCOM_PRODUCT_PC5750 0x3702 /* aka Pantech PX-500 */
47 #define SANYO_PRODUCT_KATANA_LX 0x0754 /* SCP-3800 (Katana LX) */
51 #define SAMSUNG_PRODUCT_U520 0x6640 /* SCH-U520 */
/linux/Documentation/devicetree/bindings/serial/
H A Desp,esp32-acm.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
4 ---
5 $id: http://devicetree.org/schemas/serial/esp,esp32-acm.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: ESP32S3 ACM gadget controller
11 - Max Filippov <jcmvbkbc@gmail.com>
14 Fixed function USB CDC-ACM gadget controller of the Espressif ESP32S3 SoC.
17 - $ref: serial.yaml#
21 const: esp,esp32s3-acm
30 - compatible
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/linux/drivers/usb/gadget/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
7 # NOTE: Gadget support ** DOES NOT ** depend on host-side CONFIG_USB !!
9 # - Host systems (like PCs) need CONFIG_USB (with "A" jacks).
10 # - Peripherals (like PDAs) need CONFIG_USB_GADGET (with "B" jacks).
11 # - Some systems have both kinds of controllers.
13 # With help from a special transceiver and a "Mini-AB" jack, systems with
14 # both kinds of controller can also support "USB On-the-Go" (CONFIG_USB_OTG).
25 you can't connect a "to-the-host" connector to a peripheral.
44 For more information, see <http://www.linux-usb.org/gadget> and
100 int "Maximum VBUS Power usage (2-500 mA)"
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/linux/drivers/net/usb/
H A Drndis_host.c1 // SPDX-License-Identifier: GPL-2.0-or-later
14 #include <linux/usb/cdc.h>
20 * RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of
21 * course ACM was intended for modems, not Ethernet links! USB's standard
22 * for Ethernet links is "CDC Ethernet", which is significantly simpler.
26 * - Power management in particular relies on information that's scattered
29 * - There are various undocumented protocol requirements, such as the
30 * need to send unused garbage in control-OUT messages.
31 * - In some cases, MS-Windows will emit undocumented requests; this
34 * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
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H A Dcdc_ether.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * CDC Ethernet based networking peripherals
4 * Copyright (C) 2003-2005 by David Brownell
18 #include <linux/usb/cdc.h>
26 return (desc->bInterfaceClass == USB_CLASS_COMM && in is_rndis()
27 desc->bInterfaceSubClass == 2 && in is_rndis()
28 desc->bInterfaceProtocol == 0xff); in is_rndis()
33 return (desc->bInterfaceClass == USB_CLASS_MISC && in is_activesync()
34 desc->bInterfaceSubClass == 1 && in is_activesync()
35 desc->bInterfaceProtocol == 1); in is_activesync()
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H A Dlg-vl600.c1 // SPDX-License-Identifier: GPL-2.0-or-later
12 #include <linux/usb/cdc.h>
20 * The device has a CDC ACM port for modem control (it claims to be
21 * CDC ACM anyway) and a CDC Ethernet port for actual network data.
27 * sent/received from the CDC Ethernet port. The proprietary header
62 return -ENOMEM; in vl600_bind()
70 dev->driver_priv = s; in vl600_bind()
79 dev->net->flags |= IFF_NOARP; in vl600_bind()
81 dev->net->flags |= IFF_MULTICAST; in vl600_bind()
88 struct vl600_state *s = dev->driver_priv; in vl600_unbind()
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H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
5 comment "Host-side USB support is needed for USB Network Adapter support"
16 tristate "USB CATC NetMate-based Ethernet device support"
35 tristate "USB KLSI KL5USB101-based ethernet device support"
40 ADS USB-10BT
45 D-Link DSB-650C and DU-E10
47 I-O DATA USB-ET/T
51 Mobility USB-Ethernet Adapter
52 NetGear EA-101
61 SmartBridges smartNIC or on Belkin F5U111 devices - you should use
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H A Dkalmia.c1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Samsung GT-B3730 and GT-B3710.
22 #include <linux/usb/cdc.h>
27 * The Samsung Kalmia based LTE USB modems have a CDC ACM port for modem control
34 * connect the modem using AT commands through the ACM port and then use
43 * https://github.com/mkotsbak/Samsung-GT-B3730-linux-driver
53 /*-------------------------------------------------------------------------*/
62 netdev_dbg(dev->net, "Sending init packet"); in kalmia_send_init_packet()
64 status = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 0x02), in kalmia_send_init_packet()
67 netdev_err(dev->net, in kalmia_send_init_packet()
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/linux/Documentation/driver-api/usb/
H A Dgadget.rst11 This document presents a Linux-USB "Gadget" kernel mode API, for use
17 - Supports USB 2.0, for high speed devices which can stream data at
20 - Handles devices with dozens of endpoints just as well as ones with
21 just two fixed-function ones. Gadget drivers can be written so
24 - Flexible enough to expose more complex USB device capabilities such
28 - USB "On-The-Go" (OTG) support, in conjunction with updates to the
29 Linux-USB host side.
31 - Sharing data structures and API models with the Linux-USB host side
32 API. This helps the OTG support, and looks forward to more-symmetric
36 - Minimalist, so it's easier to support new device controller hardware.
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