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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44 .Nd USB generic device support
47 is integrated into the
53 driver provides support for all USB devices that do not have
55 It supports access to all parts of the device,
56 but not in a way that is as convenient as a special purpose driver.
58 There can be up to 127 USB devices connected to a USB bus.
59 Each USB device can have up to 16 endpoints.
60 Each of these endpoints
61 will communicate in one of four different modes: control, isochronous,
63 Each of the endpoints will have a different
65 The four least significant bits in the minor device
66 number determine which endpoint the device accesses, and the rest
67 of the bits determine which USB device.
69 If an endpoint address is used both for input and output, the device
70 can be opened for both read or write.
72 To find out which endpoints exist, there are a series of
74 operations on the control endpoint that return the USB descriptors
75 of the device, configurations, interfaces, and endpoints.
77 The control transfer mode can only happen on the control endpoint
78 which is always endpoint 0.
79 The control endpoint accepts a request
80 and may respond with an answer to such a request.
86 .\" The isochronous transfer mode can be in or out depending on the
88 .\" To perform I/O on an isochronous endpoint
93 .\" Before any I/O operations can take place the transfer rate in
94 .\" bytes/second has to be set.
97 .\" .Dv USB_SET_ISO_RATE .
98 .\" Performing this call sets up a buffer corresponding to
99 .\" about 1 second of data.
101 The bulk transfer mode can be in or out depending on the
103 To perform I/O on a bulk endpoint
108 All I/O operations on a bulk endpoint are unbuffered.
110 The interrupt transfer mode can be in or out depending on the
112 To perform I/O on an interrupt endpoint
117 A moderate amount of buffering is done
120 All endpoints handle the following
123 .Bl -tag -width indent
124 .It Dv USB_SET_SHORT_XFER Pq Vt int
125 Allow short read transfer.
126 Normally a transfer from the device
127 which is shorter than the request specified is reported as an
129 .It Dv USB_SET_TIMEOUT Pq Vt int
130 Set the timeout on the device operations
131 The time is specified in milliseconds.
132 The value 0 is used to indicate that there is
136 The control endpoint (endpoint 0) handles the following
139 .Bl -tag -width indent
140 .It Dv USB_GET_CONFIG Pq Vt int
141 Get the device configuration number.
142 .It Dv USB_SET_CONFIG Pq Vt int
143 Set the device into the given configuration number.
145 This operation can only be performed when the control endpoint
146 is the sole open endpoint.
147 .It Dv USB_GET_ALTINTERFACE Pq Vt "struct usb_alt_interface"
148 Get the alternative setting number for the interface with the given
152 is ignored in this call.
154 struct usb_alt_interface {
155 int uai_config_index;
156 int uai_interface_index;
160 .It Dv USB_SET_ALTINTERFACE Pq Vt "struct usb_alt_interface"
161 Set the alternative setting to the given number in the interface with the
165 is ignored in this call.
167 This operation can only be performed when no endpoints for the interface
169 .It Dv USB_GET_NO_ALT Pq Vt "struct usb_alt_interface"
170 Return the number of different alternate settings in the
173 .It Dv USB_GET_DEVICE_DESC Pq Vt usb_device_descriptor_t
174 Return the device descriptor.
175 .It Dv USB_GET_CONFIG_DESC Pq Vt "struct usb_config_desc"
176 Return the descriptor for the configuration with the given index.
177 For convenience, the current configuration can be specified by
178 .Dv USB_CURRENT_CONFIG_INDEX .
180 struct usb_config_desc {
181 int ucd_config_index;
182 usb_config_descriptor_t ucd_desc;
185 .It Dv USB_GET_INTERFACE_DESC Pq Vt "struct usb_interface_desc"
186 Return the interface descriptor for an interface specified by its
187 configuration index, interface index, and alternative index.
188 For convenience, the current alternative can be specified by
189 .Dv USB_CURRENT_ALT_INDEX .
191 struct usb_interface_desc {
192 int uid_config_index;
193 int uid_interface_index;
195 usb_interface_descriptor_t uid_desc;
198 .It Dv USB_GET_ENDPOINT_DESC Pq Vt "struct usb_endpoint_desc"
199 Return the endpoint descriptor for the endpoint specified by its
200 configuration index, interface index, alternative index, and
203 struct usb_endpoint_desc {
204 int ued_config_index;
205 int ued_interface_index;
207 int ued_endpoint_index;
208 usb_endpoint_descriptor_t ued_desc;
211 .It Dv USB_GET_FULL_DESC Pq Vt "struct usb_full_desc"
212 Return all the descriptors for the given configuration.
214 struct usb_full_desc {
215 int ufd_config_index;
222 field should point to a memory area of the size given in the
225 The proper size can be determined by first issuing a
226 .Dv USB_GET_CONFIG_DESC
230 .It Dv USB_GET_STRING_DESC Pq Vt "struct usb_string_desc"
231 Get a string descriptor for the given language ID and
234 struct usb_string_desc {
235 int usd_string_index;
237 usb_string_descriptor_t usd_desc;
240 .It Dv USB_DO_REQUEST Pq Vt "struct usb_ctl_request"
241 Send a USB request to the device on the control endpoint.
242 Any data sent to/from the device is located at
244 The size of the transferred data is determined from the
248 field is ignored in this call.
251 field can be used to flag that the request is allowed to
252 be shorter than the requested size, and
254 will contain the actual size on completion.
256 struct usb_ctl_request {
258 usb_device_request_t ucr_request;
261 #define USBD_SHORT_XFER_OK 0x04 /* allow short reads */
262 int ucr_actlen; /* actual length transferred */
265 This is a dangerous operation in that it can perform arbitrary operations
267 Some of the most dangerous (e.g., changing the device
268 address) are not allowed.
269 .It Dv USB_GET_DEVICEINFO Pq Vt "struct usb_device_info"
270 Get an information summary for the device.
271 This call will not issue any USB transactions.
274 Note that there are two different ways of addressing configurations,
275 interfaces, alternatives, and endpoints: by index or by number.
276 The index is the ordinal number (starting from 0) of the descriptor
277 as presented by the device.
278 The number is the respective number of
279 the entity as found in its descriptor.
280 Enumeration of descriptors
281 uses the index, getting and setting typically uses numbers.
284 all endpoints (except the control endpoint) for the current configuration
285 can be found by iterating the
288 .Va config_desc->bNumInterface Ns \-1
289 and for each of these, iterating the
292 .Va interface_desc->bNumEndpoints .
296 .Dv USB_CURRENT_CONFIG_INDEX
300 .Dv USB_CURRENT_ALT_INDEX .
302 .Bl -tag -width ".Pa /dev/ugen Ns Ar N Ns Pa \&. Ns Ar EE" -compact
303 .It Pa /dev/ugen Ns Ar N Ns Pa \&. Ns Ar EE
318 .\" The driver is not yet finished; there is no access to isochronous endpoints.