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 CATC USB-EL1210A Ethernet driver
104 USB Apple iPhone/iPad tethered Ethernet driver
106 Kawasaki LSI KL5KUSB101B Ethernet driver
108 .\"USB CDC (communication device class) driver for the LG P-500 smartphone
110 Moschip MCS7730/MCS7830/MCS7832 USB Ethernet driver
112 .\"RealTek RTL8150 Ethernet driver
114 Davicom DM9601 USB Ethernet driver
116 .Ss Wireless network interfaces
117 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
119 NDIS miniport driver wrapper
121 Ralink Technology RT2501USB/RT2601USB IEEE 802.11 driver
123 Ralink Technology RT2700U/RT2800U/RT3000U IEEE 802.11 driver
125 .\"Bluetooth adapters
127 .\"Ralink Technology RT2500USB IEEE 802.11 driver
129 RNDIS USB ethernet driver
131 Realtek RTL8188CU/RTL8192CU IEEE 802.11 driver
133 .Ss Serial and parallel interfaces
134 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
136 .\"MosChip Semiconductor MCS7703 based serial adapters
138 support for 3G datacards
140 Arkmicro Technologies ARK3116 based serial adapters
142 Belkin serial adapters
144 support for BWCT console serial adapters
146 WinChipHead CH341/CH340 serial adapters
150 Cypress CY7C63743 and CY7C64013 USB to RS232 bridges
154 serial devices based on the FTDI chips
156 generic serial device
158 support for iPAQ units
162 serial adapters based on the MCS7820 and MCS7840 chips
164 Magic Control Technology USB-232 based serial adapters
168 serial adapters based on the MCS7703 chip
170 Prolific PL-2303/2303X/2303HX serial adapters
172 Silicon Laboratories CP2101, CP2102 and CP2103 USB to serial bridge
174 .\"Texas Instruments TUSB3410 RS232 to USB converter
176 support for the Handspring Visor, a Palmpilot compatible PDA
178 SUNTAC Slipper U VS-10U serial adapters
181 .\".Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
182 .\".It Xr snd_uaudio 4
183 .\"audio device driver
185 .\"driver for the Rio500 MP3 player
187 .Ss Radio receiver devices
188 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
190 Cypress Semiconductor FM Radio
192 .Ss Human Interface Devices
193 .Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
195 eGalax touchscreen driver
197 generic driver for Human Interface Devices
199 keyboards that follow the boot protocol
203 .\".Ss Miscellaneous devices
204 .\".Bl -tag -width ".Xr snd_uaudio 4" -offset indent -compact
208 .Sh INTRODUCTION TO USB
211 is a system where external devices can be connected to a PC.
212 The most common USB speeds are:
213 .Bl -tag -width 6n -offset indent
214 .It Low Speed (1.5MBit/sec)
215 .It Full Speed (12MBit/sec)
216 .It High Speed (480MBit/sec)
221 has a USB controller that is the master of the bus.
222 The physical communication is simplex which means the host controller only communicates with one USB device at a time.
224 There can be up to 127 devices connected to an USB HUB tree.
225 The addresses are assigned
226 dynamically by the host when each device is attached to the bus.
228 Within each device there can be up to 16 endpoints.
230 is individually addressed and the addresses are static.
231 Each of these endpoints will communicate in one of four different modes:
232 .Em control , isochronous , bulk ,
235 A device always has at least one endpoint.
236 This endpoint has address 0 and is a control
237 endpoint and is used to give commands to and extract basic data,
238 such as descriptors, from the device.
239 Each endpoint, except the control endpoint, is unidirectional.
241 The endpoints in a device are grouped into interfaces.
242 An interface is a logical unit within a device; e.g.\&
243 a compound device with both a keyboard and a trackball would present
244 one interface for each.
245 An interface can sometimes be set into different modes,
246 called alternate settings, which affects how it operates.
247 Different alternate settings can have different endpoints
250 A device may operate in different configurations.
252 configuration, the device may present different sets of endpoints
255 The bus enumeration of the
257 bus proceeds in several steps:
260 Any interface specific driver can attach to the device.
262 If none is found, generic interface class drivers can attach.
267 specifications can be found at:
269 .D1 Pa http://www.usb.org/developers/docs/
323 module complies with the USB 2.0 standard.
327 module has been inspired by the
329 USB stack initially written by Lennart Augustsson.
332 module was written by
333 .An Hans Petter Selasky Aq Mt hselasky@FreeBSD.org .