1 .\" $NetBSD: ugen.4,v 1.13 2001/09/11 22:52:54 wiz Exp $
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7 .\" by Lennart Augustsson.
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37 .\" $FreeBSD: src/share/man/man4/ugen.4,v 1.1.2.2 2001/12/17 11:30:12 ru Exp $
44 .Nd USB generic device support
50 driver provides support for all USB devices that do not have
52 It supports access to all parts of the device,
53 but not in a way that is as convenient as a special purpose driver.
55 There can be up to 127 USB devices connected to a USB bus.
56 Each USB device can have up to 16 endpoints.
57 Each of these endpoints
58 will communicate in one of four different modes: control, isochronous,
60 Each of the endpoints will have a different
62 The four least significant bits in the minor device
63 number determines which endpoint the device accesses and the rest
64 of the bits determines which USB device.
66 If an endpoint address is used both for input and output the device
67 can be opened for both read or write.
69 To find out what endpoints that exist there are a series of
71 operation on the control endpoint that returns the USB descriptors
72 of the device, configurations, interfaces, and endpoints.
74 The control transfer mode can only happen on the control endpoint
75 which is always endpoint 0.
76 The control endpoint accepts request
77 and may respond with an answer to such request.
83 .\" The isochronous transfer mode can be in or out depending on the
85 .\" To perform I/O on an isochronous endpoint
90 .\" Before any I/O operations can take place the transfer rate in
91 .\" bytes/second has to be set.
94 .\" .Dv USB_SET_ISO_RATE .
95 .\" Performing this call sets up a buffer corresponding to
96 .\" about 1 second of data.
98 The bulk transfer mode can be in or out depending on the
100 To perform I/O on a bulk endpoint
105 All I/O operations on a bulk endpoint are unbuffered.
107 The interrupt transfer mode can only be in.
108 To perform input from an interrupt endpoint
111 A moderate amount of buffering is done
114 All endpoints handle the following
117 .Bl -tag -width indent
118 .It Dv USB_SET_SHORT_XFER Pq Vt int
119 Allow short read transfer.
120 Normally a transfer from the device
121 which is shorter than the request specified is reported as an
123 .It Dv USB_SET_TIMEOUT Pq Vt int
124 Set the timeout on the device operations, the time is specified
126 The value 0 is used to indicate that there is
130 The control endpoint (endpoint 0) handles the following
133 .Bl -tag -width indent
134 .It Dv USB_GET_CONFIG Pq Vt int
135 Get the device configuration number.
136 .It Dv USB_SET_CONFIG Pq Vt int
137 Set the device into the given configuration number.
139 This operation can only be performed when the control endpoint
140 is the sole open endpoint.
141 .It Dv USB_GET_ALTINTERFACE Pq Vt "struct usb_alt_interface"
142 Get the alternative setting number for the interface with the given
146 is ignored in this call.
148 struct usb_alt_interface {
154 .It Dv USB_SET_ALTINTERFACE Pq Vt "struct usb_alt_interface"
155 Set the alternative setting to the given number in the interface with the
159 is ignored in this call.
161 This operation can only be performed when no endpoints for the interface
163 .It Dv USB_GET_NO_ALT Pq Vt "struct usb_alt_interface"
164 Return the number of different alternate settings in the
167 .It Dv USB_GET_DEVICE_DESC Pq Vt usb_device_descriptor_t
168 Return the device descriptor.
169 .It Dv USB_GET_CONFIG_DESC Pq Vt "struct usb_config_desc"
170 Return the descriptor for the configuration with the given index.
171 For convenience the current configuration can be specified by
172 .Dv USB_CURRENT_CONFIG_INDEX .
174 struct usb_config_desc {
176 usb_config_descriptor_t desc;
179 .It Dv USB_GET_INTERFACE_DESC Pq Vt "struct usb_interface_desc"
180 Return the interface descriptor for an interface specified by its
181 configuration index, interface index, and alternative index.
182 For convenience the current alternative can be specified by
183 .Dv USB_CURRENT_ALT_INDEX .
185 struct usb_interface_desc {
189 usb_interface_descriptor_t desc;
192 .It Dv USB_GET_ENDPOINT_DESC Pq Vt "struct usb_endpoint_desc"
193 Return the endpoint descriptor for the endpoint specified by its
194 configuration index, interface index, alternative index, and
197 struct usb_endpoint_desc {
202 usb_endpoint_descriptor_t desc;
205 .It Dv USB_GET_FULL_DESC Pq Vt "struct usb_full_desc"
206 Return all the descriptors for the given configuration.
208 struct usb_full_desc {
216 field should point to a memory area of the size given in the
219 The proper size can be determined by first issuing a
220 .Dv USB_GET_CONFIG_DESC
224 .It Dv USB_GET_STRING_DESC Pq Vt "struct usb_string_desc"
225 Get a string descriptor for the given language ID and
228 struct usb_string_desc {
231 usb_string_descriptor_t desc;
234 .It Dv USB_DO_REQUEST Pq Vt "struct usb_ctl_request"
235 Send a USB request to the device on the control endpoint.
236 Any data sent to/from the device is located at
238 The size of the transferred data is determined from the
242 field is ignored in this call.
245 field can be used to flag that the request is allowed to
246 be shorter than the requested size, and the
248 will contain the actual size on completion.
250 struct usb_ctl_request {
252 usb_device_request_t request;
255 #define USBD_SHORT_XFER_OK 0x04 /* allow short reads */
256 int actlen; /* actual length transferred */
259 This is a dangerous operation in that it can perform arbitrary operations
261 Some of the most dangerous (e.g., changing the device
262 address) are not allowed.
263 .It Dv USB_GET_DEVICEINFO Pq Vt "struct usb_device_info"
264 Get an information summary for the device.
266 issue any USB transactions.
269 Note that there are two different ways of addressing configurations, interfaces,
270 alternatives, and endpoints: by index or by number.
271 The index is the ordinal number (starting from 0) of the descriptor
272 as presented by the device.
273 The number is the respective number of
274 the entity as found in its descriptor.
275 Enumeration of descriptors
276 use the index, getting and setting typically uses numbers.
279 all endpoints (except the control endpoint) for the current configuration
280 can be found by iterating the
283 .Va config_desc->bNumInterface Ns \-1
284 and for each of these iterating the
287 .Va interface_desc->bNumEndpoints .
291 .Dv USB_CURRENT_CONFIG_INDEX
295 .Dv USB_CURRENT_ALT_INDEX .
297 .Bl -tag -width ".Pa /dev/ugen Ns Ar N Ns Pa \&. Ns Ar EE" -compact
298 .It Pa /dev/ugen Ns Ar N Ns Pa \&. Ns Ar EE
313 .\" The driver is not yet finished; there is no access to isochronous endpoints.