1 .\" Copyright (c) 1997, 1998 Nick Hibma <n_hibma@FreeBSD.org>
2 .\" Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
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25 .\" $FreeBSD: head/share/man/man4/usb.4 258618 2013-11-26 07:52:40Z lwhsu $
32 .Nd Universal Serial Bus
34 To compile this driver into the kernel,
35 place the following line in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
41 Alternatively, to load the driver as a
42 module at boot time, place the following line in
44 .Bd -literal -offset indent
47 .Sh USERLAND PROGRAMMING
48 USB functions can be accessed from userland through the libusb library.
54 provides machine-independent bus support and drivers for
56 devices in host and device side mode.
60 driver has three layers:
61 .Bl -tag -width 6n -offset indent
62 .It USB Controller (Bus)
67 The controller attaches to a physical bus
72 bus attaches to the controller, and the root hub attaches
74 Any devices attached to the bus will attach to the root hub
75 or another hub attached to the
81 device will always be present as it is needed for the
85 provides support for the following devices.
87 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
91 Mass Storage Devices, e.g., external disk drives
93 Mass storage driver for device-side mode
95 .Ss Wired network interfaces
96 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
98 ADMtek AN986 Pegasus Ethernet driver
100 ASIX Electronics AX88x7x/760 USB Ethernet driver
102 ASIX Electronics AX88178A/AX88179 USB Gigabit Ethernet driver
104 CATC USB-EL1210A Ethernet driver
106 USB Apple iPhone/iPad tethered Ethernet driver
108 Kawasaki LSI KL5KUSB101B Ethernet driver
110 .\"USB CDC (communication device class) driver for the LG P-500 smartphone
112 Moschip MCS7730/MCS7830/MCS7832 USB Ethernet driver
114 .\"RealTek RTL8150 Ethernet driver
116 Davicom DM9601 USB Ethernet driver
118 .Ss Wireless network interfaces
119 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
121 NDIS miniport driver wrapper
123 Ralink Technology RT2501USB/RT2601USB IEEE 802.11 driver
125 Ralink Technology RT2700U/RT2800U/RT3000U IEEE 802.11 driver
127 .\"Bluetooth adapters
129 .\"Ralink Technology RT2500USB IEEE 802.11 driver
131 RNDIS USB ethernet driver
133 Realtek RTL8188CU/RTL8192CU IEEE 802.11 driver
135 .Ss Serial and parallel interfaces
136 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
138 .\"MosChip Semiconductor MCS7703 based serial adapters
140 support for 3G datacards
142 Arkmicro Technologies ARK3116 based serial adapters
144 Belkin serial adapters
146 support for BWCT console serial adapters
148 WinChipHead CH341/CH340 serial adapters
152 Cypress CY7C63743 and CY7C64013 USB to RS232 bridges
156 serial devices based on the FTDI chips
158 generic serial device
160 support for iPAQ units
164 serial adapters based on the MCS7820 and MCS7840 chips
166 Magic Control Technology USB-232 based serial adapters
170 serial adapters based on the MCS7703 chip
172 Prolific PL-2303/2303X/2303HX serial adapters
174 Silicon Laboratories CP2101, CP2102 and CP2103 USB to serial bridge
176 .\"Texas Instruments TUSB3410 RS232 to USB converter
178 support for the Handspring Visor, a Palmpilot compatible PDA
180 SUNTAC Slipper U VS-10U serial adapters
183 .\".Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
184 .\".It Xr snd_uaudio 4
185 .\"audio device driver
187 .\"driver for the Rio500 MP3 player
189 .Ss Radio receiver devices
190 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
192 Cypress Semiconductor FM Radio
194 .Ss Human Interface Devices
195 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
197 eGalax touchscreen driver
199 generic driver for Human Interface Devices
201 keyboards that follow the boot protocol
205 .\".Ss Miscellaneous devices
206 .\".Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
210 .Sh INTRODUCTION TO USB
213 is a system where external devices can be connected to a PC.
214 The most common USB speeds are:
215 .Bl -tag -width 6n -offset indent
216 .It Low Speed (1.5MBit/sec)
217 .It Full Speed (12MBit/sec)
218 .It High Speed (480MBit/sec)
223 has a USB controller that is the master of the bus.
224 The physical communication is simplex which means the host controller only communicates with one USB device at a time.
226 There can be up to 127 devices connected to an USB HUB tree.
227 The addresses are assigned
228 dynamically by the host when each device is attached to the bus.
230 Within each device there can be up to 16 endpoints.
232 is individually addressed and the addresses are static.
233 Each of these endpoints will communicate in one of four different modes:
234 .Em control , isochronous , bulk ,
237 A device always has at least one endpoint.
238 This endpoint has address 0 and is a control
239 endpoint and is used to give commands to and extract basic data,
240 such as descriptors, from the device.
241 Each endpoint, except the control endpoint, is unidirectional.
243 The endpoints in a device are grouped into interfaces.
244 An interface is a logical unit within a device; e.g.\&
245 a compound device with both a keyboard and a trackball would present
246 one interface for each.
247 An interface can sometimes be set into different modes,
248 called alternate settings, which affects how it operates.
249 Different alternate settings can have different endpoints
252 A device may operate in different configurations.
254 configuration, the device may present different sets of endpoints
257 The bus enumeration of the
259 bus proceeds in several steps:
262 Any interface specific driver can attach to the device.
264 If none is found, generic interface class drivers can attach.
269 specifications can be found at:
271 .D1 Pa http://www.usb.org/developers/docs/
325 module complies with the USB 2.0 standard.
329 module has been inspired by the
331 USB stack initially written by Lennart Augustsson.
334 module was written by
335 .An Hans Petter Selasky Aq Mt hselasky@FreeBSD.org .