1 What: /sys/bus/usb/devices/<INTERFAC !! 1 What: /sys/bus/usb/devices/INTERFACE/authorized
2 Date: August 2015 2 Date: August 2015
3 Description: 3 Description:
4 This allows to authorize (1) o 4 This allows to authorize (1) or deauthorize (0)
5 individual interfaces instead 5 individual interfaces instead a whole device
6 in contrast to the device auth 6 in contrast to the device authorization.
7 If a deauthorized interface wi 7 If a deauthorized interface will be authorized
8 so the driver probing must be 8 so the driver probing must be triggered manually
9 by writing INTERFACE to /sys/b 9 by writing INTERFACE to /sys/bus/usb/drivers_probe
10 This allows to avoid side-effe 10 This allows to avoid side-effects with drivers
11 that need multiple interfaces. 11 that need multiple interfaces.
12 <<
13 A deauthorized interface canno 12 A deauthorized interface cannot be probed or claimed.
14 13
15 What: /sys/bus/usb/devices/usbX/inte 14 What: /sys/bus/usb/devices/usbX/interface_authorized_default
16 Date: August 2015 15 Date: August 2015
17 Description: 16 Description:
18 This is used as value that det 17 This is used as value that determines if interfaces
19 would be authorized by default 18 would be authorized by default.
20 The value can be 1 or 0. It's 19 The value can be 1 or 0. It's by default 1.
21 20
22 What: /sys/bus/usb/device/.../author 21 What: /sys/bus/usb/device/.../authorized
23 Date: July 2008 22 Date: July 2008
24 KernelVersion: 2.6.26 23 KernelVersion: 2.6.26
25 Contact: David Vrabel <david.vrabel@csr. 24 Contact: David Vrabel <david.vrabel@csr.com>
26 Description: 25 Description:
27 Authorized devices are availab 26 Authorized devices are available for use by device
28 drivers, non-authorized one ar 27 drivers, non-authorized one are not. By default, wired
29 USB devices are authorized. 28 USB devices are authorized.
30 29
>> 30 Certified Wireless USB devices are not authorized
>> 31 initially and should be (by writing 1) after the
>> 32 device has been authenticated.
>> 33
>> 34 What: /sys/bus/usb/device/.../wusb_cdid
>> 35 Date: July 2008
>> 36 KernelVersion: 2.6.27
>> 37 Contact: David Vrabel <david.vrabel@csr.com>
>> 38 Description:
>> 39 For Certified Wireless USB devices only.
>> 40
>> 41 A devices's CDID, as 16 space-separated hex octets.
>> 42
>> 43 What: /sys/bus/usb/device/.../wusb_ck
>> 44 Date: July 2008
>> 45 KernelVersion: 2.6.27
>> 46 Contact: David Vrabel <david.vrabel@csr.com>
>> 47 Description:
>> 48 For Certified Wireless USB devices only.
>> 49
>> 50 Write the device's connection key (CK) to start the
>> 51 authentication of the device. The CK is 16
>> 52 space-separated hex octets.
>> 53
>> 54 What: /sys/bus/usb/device/.../wusb_disconnect
>> 55 Date: July 2008
>> 56 KernelVersion: 2.6.27
>> 57 Contact: David Vrabel <david.vrabel@csr.com>
>> 58 Description:
>> 59 For Certified Wireless USB devices only.
>> 60
>> 61 Write a 1 to force the device to disconnect
>> 62 (equivalent to unplugging a wired USB device).
>> 63
31 What: /sys/bus/usb/drivers/.../new_i 64 What: /sys/bus/usb/drivers/.../new_id
32 Date: October 2011 65 Date: October 2011
33 Contact: linux-usb@vger.kernel.org 66 Contact: linux-usb@vger.kernel.org
34 Description: 67 Description:
35 Writing a device ID to this fi 68 Writing a device ID to this file will attempt to
36 dynamically add a new device I 69 dynamically add a new device ID to a USB device driver.
37 This may allow the driver to s 70 This may allow the driver to support more hardware than
38 was included in the driver's s 71 was included in the driver's static device ID support
39 table at compile time. The for 72 table at compile time. The format for the device ID is:
40 idVendor idProduct bInterfaceC 73 idVendor idProduct bInterfaceClass RefIdVendor RefIdProduct
41 The vendor ID and device ID fi 74 The vendor ID and device ID fields are required, the
42 rest is optional. The `Ref*` t !! 75 rest is optional. The Ref* tuple can be used to tell the
43 driver to use the same driver_ 76 driver to use the same driver_data for the new device as
44 it is used for the reference d 77 it is used for the reference device.
45 Upon successfully adding an ID 78 Upon successfully adding an ID, the driver will probe
46 for the device and attempt to !! 79 for the device and attempt to bind to it. For example:
47 !! 80 # echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id
48 # echo "8086 10f5" > /sys/bu <<
49 81
50 Here add a new device (0458:70 82 Here add a new device (0458:7045) using driver_data from
51 an already supported device (0 !! 83 an already supported device (0458:704c):
52 !! 84 # echo "0458 7045 0 0458 704c" > /sys/bus/usb/drivers/foo/new_id
53 # echo "0458 7045 0 0458 704 <<
54 85
55 Reading from this file will li 86 Reading from this file will list all dynamically added
56 device IDs in the same format, 87 device IDs in the same format, with one entry per
57 line. For example:: !! 88 line. For example:
58 !! 89 # cat /sys/bus/usb/drivers/foo/new_id
59 # cat /sys/bus/usb/drivers/f !! 90 8086 10f5
60 8086 10f5 !! 91 dead beef 06
61 dead beef 06 !! 92 f00d cafe
62 f00d cafe <<
63 93
64 The list will be truncated at 94 The list will be truncated at PAGE_SIZE bytes due to
65 sysfs restrictions. 95 sysfs restrictions.
66 96
67 What: /sys/bus/usb-serial/drivers/.. 97 What: /sys/bus/usb-serial/drivers/.../new_id
68 Date: October 2011 98 Date: October 2011
69 Contact: linux-usb@vger.kernel.org 99 Contact: linux-usb@vger.kernel.org
70 Description: 100 Description:
71 For serial USB drivers, this a 101 For serial USB drivers, this attribute appears under the
72 extra bus folder "usb-serial" 102 extra bus folder "usb-serial" in sysfs; apart from that
73 difference, all descriptions f 103 difference, all descriptions from the entry
74 "/sys/bus/usb/drivers/.../new_ 104 "/sys/bus/usb/drivers/.../new_id" apply.
75 105
76 What: /sys/bus/usb/drivers/.../remov 106 What: /sys/bus/usb/drivers/.../remove_id
77 Date: November 2009 107 Date: November 2009
78 Contact: CHENG Renquan <rqcheng@smu.edu. 108 Contact: CHENG Renquan <rqcheng@smu.edu.sg>
79 Description: 109 Description:
80 Writing a device ID to this fi 110 Writing a device ID to this file will remove an ID
81 that was dynamically added via 111 that was dynamically added via the new_id sysfs entry.
82 The format for the device ID i 112 The format for the device ID is:
83 idVendor idProduct. After 113 idVendor idProduct. After successfully
84 removing an ID, the driver wil 114 removing an ID, the driver will no longer support the
85 device. This is useful to ens 115 device. This is useful to ensure auto probing won't
86 match the driver to the device 116 match the driver to the device. For example:
87 # echo "046d c315" > /sys/bus/ 117 # echo "046d c315" > /sys/bus/usb/drivers/foo/remove_id
88 118
89 Reading from this file will li 119 Reading from this file will list the dynamically added
90 device IDs, exactly like readi 120 device IDs, exactly like reading from the entry
91 "/sys/bus/usb/drivers/.../new_ 121 "/sys/bus/usb/drivers/.../new_id"
92 122
93 What: /sys/bus/usb/devices/.../power 123 What: /sys/bus/usb/devices/.../power/usb2_hardware_lpm
94 Date: September 2011 124 Date: September 2011
95 Contact: Andiry Xu <andiry.xu@amd.com> 125 Contact: Andiry Xu <andiry.xu@amd.com>
96 Description: 126 Description:
97 If CONFIG_PM is set and a USB 127 If CONFIG_PM is set and a USB 2.0 lpm-capable device is plugged
98 in to a xHCI host which suppor 128 in to a xHCI host which support link PM, it will perform a LPM
99 test; if the test is passed an 129 test; if the test is passed and host supports USB2 hardware LPM
100 (xHCI 1.0 feature), USB2 hardw 130 (xHCI 1.0 feature), USB2 hardware LPM will be enabled for the
101 device and the USB device dire 131 device and the USB device directory will contain a file named
102 power/usb2_hardware_lpm. The 132 power/usb2_hardware_lpm. The file holds a string value (enable
103 or disable) indicating whether 133 or disable) indicating whether or not USB2 hardware LPM is
104 enabled for the device. Develo 134 enabled for the device. Developer can write y/Y/1 or n/N/0 to
105 the file to enable/disable the 135 the file to enable/disable the feature.
106 136
107 What: /sys/bus/usb/devices/.../power 137 What: /sys/bus/usb/devices/.../power/usb3_hardware_lpm_u1
108 /sys/bus/usb/devices/.../power 138 /sys/bus/usb/devices/.../power/usb3_hardware_lpm_u2
109 Date: November 2015 139 Date: November 2015
110 Contact: Kevin Strasser <kevin.strasser@ 140 Contact: Kevin Strasser <kevin.strasser@linux.intel.com>
111 Lu Baolu <baolu.lu@linux.intel. 141 Lu Baolu <baolu.lu@linux.intel.com>
112 Description: 142 Description:
113 If CONFIG_PM is set and a USB 143 If CONFIG_PM is set and a USB 3.0 lpm-capable device is plugged
114 in to a xHCI host which suppor 144 in to a xHCI host which supports link PM, it will check if U1
115 and U2 exit latencies have bee 145 and U2 exit latencies have been set in the BOS descriptor; if
116 the check is passed and the ho 146 the check is passed and the host supports USB3 hardware LPM,
117 USB3 hardware LPM will be enab 147 USB3 hardware LPM will be enabled for the device and the USB
118 device directory will contain 148 device directory will contain two files named
119 power/usb3_hardware_lpm_u1 and 149 power/usb3_hardware_lpm_u1 and power/usb3_hardware_lpm_u2. These
120 files hold a string value (ena 150 files hold a string value (enable or disable) indicating whether
121 or not USB3 hardware LPM U1 or 151 or not USB3 hardware LPM U1 or U2 is enabled for the device.
122 152
>> 153 What: /sys/bus/usb/devices/.../removable
>> 154 Date: February 2012
>> 155 Contact: Matthew Garrett <mjg@redhat.com>
>> 156 Description:
>> 157 Some information about whether a given USB device is
>> 158 physically fixed to the platform can be inferred from a
>> 159 combination of hub descriptor bits and platform-specific data
>> 160 such as ACPI. This file will read either "removable" or
>> 161 "fixed" if the information is available, and "unknown"
>> 162 otherwise.
>> 163
123 What: /sys/bus/usb/devices/.../ltm_c 164 What: /sys/bus/usb/devices/.../ltm_capable
124 Date: July 2012 165 Date: July 2012
125 Contact: Sarah Sharp <sarah.a.sharp@linu 166 Contact: Sarah Sharp <sarah.a.sharp@linux.intel.com>
126 Description: 167 Description:
127 USB 3.0 devices may optionally 168 USB 3.0 devices may optionally support Latency Tolerance
128 Messaging (LTM). They indicat 169 Messaging (LTM). They indicate their support by setting a bit
129 in the bmAttributes field of t 170 in the bmAttributes field of their SuperSpeed BOS descriptors.
130 If that bit is set for the dev 171 If that bit is set for the device, ltm_capable will read "yes".
131 If the device doesn't support 172 If the device doesn't support LTM, the file will read "no".
132 The file will be present for a 173 The file will be present for all speeds of USB devices, and will
133 always read "no" for USB 1.1 a 174 always read "no" for USB 1.1 and USB 2.0 devices.
134 175
135 What: /sys/bus/usb/devices/<INTERFAC !! 176 What: /sys/bus/usb/devices/.../(hub interface)/portX
136 Date: February 2023 <<
137 Contact: Bastien Nocera <hadess@hadess.n <<
138 Description: <<
139 Some USB devices use a USB rec <<
140 wirelessly with their device u <<
141 attribute allows user-space to <<
142 connected to its receiver dong <<
143 the device to be absent when c <<
144 device's battery, show a heads <<
145 an on-screen keyboard if the o <<
146 turned off. <<
147 This attribute is not to be us <<
148 statuses available in WWAN, WL <<
149 If the device does not use a r <<
150 device, then this attribute wi <<
151 <<
152 What: /sys/bus/usb/devices/.../<hub_ <<
153 Date: August 2012 177 Date: August 2012
154 Contact: Lan Tianyu <tianyu.lan@intel.co 178 Contact: Lan Tianyu <tianyu.lan@intel.com>
155 Description: 179 Description:
156 The /sys/bus/usb/devices/.../< !! 180 The /sys/bus/usb/devices/.../(hub interface)/portX
157 is usb port device's sysfs dir 181 is usb port device's sysfs directory.
158 182
159 What: /sys/bus/usb/devices/.../<hub_ !! 183 What: /sys/bus/usb/devices/.../(hub interface)/portX/connect_type
160 Date: January 2013 184 Date: January 2013
161 Contact: Lan Tianyu <tianyu.lan@intel.co 185 Contact: Lan Tianyu <tianyu.lan@intel.com>
162 Description: 186 Description:
163 Some platforms provide usb por 187 Some platforms provide usb port connect types through ACPI.
164 This attribute is to expose th 188 This attribute is to expose these information to user space.
165 The file will read "hotplug", 189 The file will read "hotplug", "hardwired" and "not used" if the
166 information is available, and 190 information is available, and "unknown" otherwise.
167 191
168 What: /sys/bus/usb/devices/.../<hub_ !! 192 What: /sys/bus/usb/devices/.../(hub interface)/portX/location
169 Date: October 2018 193 Date: October 2018
170 Contact: Bjørn Mork <bjorn@mork.no> 194 Contact: Bjørn Mork <bjorn@mork.no>
171 Description: 195 Description:
172 Some platforms provide usb por 196 Some platforms provide usb port physical location through
173 firmware. This is used by the 197 firmware. This is used by the kernel to pair up logical ports
174 mapping to the same physical c 198 mapping to the same physical connector. The attribute exposes the
175 raw location value as a hex in 199 raw location value as a hex integer.
176 200
177 201
178 What: /sys/bus/usb/devices/.../<hub_ !! 202 What: /sys/bus/usb/devices/.../(hub interface)/portX/quirks
179 Date: May 2018 203 Date: May 2018
180 Contact: Nicolas Boichat <drinkcat@chrom 204 Contact: Nicolas Boichat <drinkcat@chromium.org>
181 Description: 205 Description:
182 In some cases, we care about t 206 In some cases, we care about time-to-active for devices
183 connected on a specific port ( 207 connected on a specific port (e.g. non-standard USB port like
184 pogo pins), where the device t 208 pogo pins), where the device to be connected is known in
185 advance, and behaves well acco 209 advance, and behaves well according to the specification.
186 This attribute is a bit-field 210 This attribute is a bit-field that controls the behavior of
187 a specific port: 211 a specific port:
188 <<
189 - Bit 0 of this field selects 212 - Bit 0 of this field selects the "old" enumeration scheme,
190 as it is considerably faste 213 as it is considerably faster (it only causes one USB reset
191 instead of 2). 214 instead of 2).
192 <<
193 The old enumeration scheme 215 The old enumeration scheme can also be selected globally
194 using /sys/module/usbcore/p 216 using /sys/module/usbcore/parameters/old_scheme_first, but
195 it is often not desirable a 217 it is often not desirable as the new scheme was introduced to
196 increase compatibility with 218 increase compatibility with more devices.
197 - Bit 1 reduces TRSTRCY to th 219 - Bit 1 reduces TRSTRCY to the 10 ms that are required by the
198 USB 2.0 specification, inst 220 USB 2.0 specification, instead of the 50 ms that are normally
199 used to help make enumerati 221 used to help make enumeration work better on some high speed
200 devices. 222 devices.
201 223
202 What: /sys/bus/usb/devices/.../<hub_ !! 224 What: /sys/bus/usb/devices/.../(hub interface)/portX/over_current_count
203 Date: February 2018 225 Date: February 2018
204 Contact: Richard Leitner <richard.leitne 226 Contact: Richard Leitner <richard.leitner@skidata.com>
205 Description: 227 Description:
206 Most hubs are able to detect o 228 Most hubs are able to detect over-current situations on their
207 ports and report them to the k 229 ports and report them to the kernel. This attribute is to expose
208 the number of over-current sit 230 the number of over-current situation occurred on a specific port
209 to user space. This file will 231 to user space. This file will contain an unsigned 32 bit value
210 which wraps to 0 after its max 232 which wraps to 0 after its maximum is reached. This file supports
211 poll() for monitoring changes 233 poll() for monitoring changes to this value in user space.
212 234
213 Any time this value changes th 235 Any time this value changes the corresponding hub device will send a
214 udev event with the following !! 236 udev event with the following attributes:
215 237
216 OVER_CURRENT_PORT=/sys/bus/u !! 238 OVER_CURRENT_PORT=/sys/bus/usb/devices/.../(hub interface)/portX
217 OVER_CURRENT_COUNT=[current !! 239 OVER_CURRENT_COUNT=[current value of this sysfs attribute]
218 240
219 What: /sys/bus/usb/devices/.../<hub_ !! 241 What: /sys/bus/usb/devices/.../(hub interface)/portX/usb3_lpm_permit
220 Date: November 2015 242 Date: November 2015
221 Contact: Lu Baolu <baolu.lu@linux.intel. 243 Contact: Lu Baolu <baolu.lu@linux.intel.com>
222 Description: 244 Description:
223 Some USB3.0 devices are not fr 245 Some USB3.0 devices are not friendly to USB3 LPM. usb3_lpm_permit
224 attribute allows enabling/disa 246 attribute allows enabling/disabling usb3 lpm of a port. It takes
225 effect both before and after a 247 effect both before and after a usb device is enumerated. Supported
226 values are "0" if both u1 and 248 values are "0" if both u1 and u2 are NOT permitted, "u1" if only u1
227 is permitted, "u2" if only u2 249 is permitted, "u2" if only u2 is permitted, "u1_u2" if both u1 and
228 u2 are permitted. 250 u2 are permitted.
229 251
230 What: /sys/bus/usb/devices/.../<hub_ <<
231 Date: December 2021 <<
232 Contact: Heikki Krogerus <heikki.krogeru <<
233 Description: <<
234 Link to the USB Type-C connect <<
235 only created when USB Type-C C <<
236 only if the system firmware is <<
237 connection between a port and <<
238 <<
239 What: /sys/bus/usb/devices/.../<hub_ <<
240 Date: June 2022 <<
241 Contact: Michael Grzeschik <m.grzeschik@ <<
242 Description: <<
243 This file controls the state o <<
244 Vbus power output (but only on <<
245 power switching -- most hubs d <<
246 a port is disabled, the port i <<
247 attached to the port will not <<
248 or enumerated. <<
249 <<
250 What: /sys/bus/usb/devices/.../<hub_ <<
251 Date: Sep 2022 <<
252 Contact: Ray Chi <raychi@google.com> <<
253 Description: <<
254 Some USB hosts have some watch <<
255 may enter ramdump if it takes <<
256 This attribute allows each por <<
257 port initialization will be fa <<
258 which is marked with early_sto <<
259 all future connections until t <<
260 <<
261 What: /sys/bus/usb/devices/.../<hub_ <<
262 Date: June 2023 <<
263 Contact: Roy Luo <royluo@google.com> <<
264 Description: <<
265 Indicates current state of the <<
266 Valid states are: 'not-attache <<
267 'reconnecting', 'unauthenticat <<
268 'configured', and 'suspended'. <<
269 monitor the state change from <<
270 <<
271 What: /sys/bus/usb/devices/.../power 252 What: /sys/bus/usb/devices/.../power/usb2_lpm_l1_timeout
272 Date: May 2013 253 Date: May 2013
273 Contact: Mathias Nyman <mathias.nyman@li 254 Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
274 Description: 255 Description:
275 USB 2.0 devices may support ha 256 USB 2.0 devices may support hardware link power management (LPM)
276 L1 sleep state. The usb2_lpm_l 257 L1 sleep state. The usb2_lpm_l1_timeout attribute allows
277 tuning the timeout for L1 inac 258 tuning the timeout for L1 inactivity timer (LPM timer), e.g.
278 needed inactivity time before 259 needed inactivity time before host requests the device to go to L1 sleep.
279 Useful for power management tu 260 Useful for power management tuning.
280 Supported values are 0 - 65535 261 Supported values are 0 - 65535 microseconds.
281 262
282 What: /sys/bus/usb/devices/.../power 263 What: /sys/bus/usb/devices/.../power/usb2_lpm_besl
283 Date: May 2013 264 Date: May 2013
284 Contact: Mathias Nyman <mathias.nyman@li 265 Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
285 Description: 266 Description:
286 USB 2.0 devices that support h 267 USB 2.0 devices that support hardware link power management (LPM)
287 L1 sleep state now use a best 268 L1 sleep state now use a best effort service latency value (BESL) to
288 indicate the best effort to re 269 indicate the best effort to resumption of service to the device after the
289 initiation of the resume event 270 initiation of the resume event.
290 If the device does not have a 271 If the device does not have a preferred besl value then the host can select
291 one instead. This usb2_lpm_bes 272 one instead. This usb2_lpm_besl attribute allows to tune the host selected besl
292 value in order to tune power s 273 value in order to tune power saving and service latency.
293 274
294 Supported values are 0 - 15. 275 Supported values are 0 - 15.
295 More information on how besl v 276 More information on how besl values map to microseconds can be found in
296 USB 2.0 ECN Errata for Link Po 277 USB 2.0 ECN Errata for Link Power Management, section 4.10)
297 278
298 What: /sys/bus/usb/devices/.../rx_la 279 What: /sys/bus/usb/devices/.../rx_lanes
299 Date: March 2018 280 Date: March 2018
300 Contact: Mathias Nyman <mathias.nyman@li 281 Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
301 Description: 282 Description:
302 Number of rx lanes the device 283 Number of rx lanes the device is using.
303 USB 3.2 adds Dual-lane support 284 USB 3.2 adds Dual-lane support, 2 rx and 2 tx lanes over Type-C.
304 Inter-Chip SSIC devices suppor 285 Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
305 direction. Devices before USB 286 direction. Devices before USB 3.2 are single lane (rx_lanes = 1)
306 287
307 What: /sys/bus/usb/devices/.../tx_la 288 What: /sys/bus/usb/devices/.../tx_lanes
308 Date: March 2018 289 Date: March 2018
309 Contact: Mathias Nyman <mathias.nyman@li 290 Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
310 Description: 291 Description:
311 Number of tx lanes the device 292 Number of tx lanes the device is using.
312 USB 3.2 adds Dual-lane support 293 USB 3.2 adds Dual-lane support, 2 rx and 2 tx -lanes over Type-C.
313 Inter-Chip SSIC devices suppor 294 Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
314 direction. Devices before USB 295 direction. Devices before USB 3.2 are single lane (tx_lanes = 1)
315 <<
316 What: /sys/bus/usb/devices/.../typec <<
317 Date: November 2023 <<
318 Contact: Heikki Krogerus <heikki.krogeru <<
319 Description: <<
320 Symlink to the USB Type-C part <<
321 represents the component that <<
322 Configuration Channel (CC sign <<
323 cables) with the local port. <<
324 <<
325 What: /sys/bus/usb/devices/usbX/bAlt <<
326 Description: <<
327 The current interface alternat <<
328 <<
329 See USB specs for its meaning. <<
330 <<
331 What: /sys/bus/usb/devices/usbX/bcdD <<
332 Description: <<
333 The device's release number, i <<
334 <<
335 See USB specs for its meaning. <<
336 <<
337 What: /sys/bus/usb/devices/usbX/bCon <<
338 Description: <<
339 While a USB device typically h <<
340 setting, some devices support <<
341 <<
342 This value shows the current c <<
343 <<
344 Changing its value will change <<
345 to another setting. <<
346 <<
347 The number of configurations s <<
348 <<
349 /sys/bus/usb/devices/u <<
350 <<
351 See USB specs for its meaning. <<
352 <<
353 What: /sys/bus/usb/devices/usbX/bDev <<
354 Description: <<
355 Class code of the device, in h <<
356 <<
357 See USB specs for its meaning. <<
358 <<
359 What: /sys/bus/usb/devices/usbX/bDev <<
360 Description: <<
361 Protocol code of the device, i <<
362 <<
363 See USB specs for its meaning. <<
364 <<
365 What: /sys/bus/usb/devices/usbX/bDev <<
366 Description: <<
367 Subclass code of the device, i <<
368 <<
369 See USB specs for its meaning. <<
370 <<
371 What: /sys/bus/usb/devices/usbX/bInt <<
372 Description: <<
373 Class code of the interface, i <<
374 <<
375 See USB specs for its meaning. <<
376 <<
377 What: /sys/bus/usb/devices/usbX/bInt <<
378 Description: <<
379 Interface number, in hexadecim <<
380 <<
381 See USB specs for its meaning. <<
382 <<
383 What: /sys/bus/usb/devices/usbX/bInt <<
384 Description: <<
385 Protocol code of the interface <<
386 <<
387 See USB specs for its meaning. <<
388 <<
389 What: /sys/bus/usb/devices/usbX/bInt <<
390 Description: <<
391 Subclass code of the interface <<
392 <<
393 See USB specs for its meaning. <<
394 <<
395 What: /sys/bus/usb/devices/usbX/bmAt <<
396 Description: <<
397 Attributes of the current conf <<
398 <<
399 See USB specs for its meaning. <<
400 <<
401 What: /sys/bus/usb/devices/usbX/bMax <<
402 Description: <<
403 Maximum endpoint 0 packet size <<
404 <<
405 See USB specs for its meaning. <<
406 <<
407 What: /sys/bus/usb/devices/usbX/bMax <<
408 Description: <<
409 Maximum power consumption of t <<
410 the device, in miliamperes. <<
411 <<
412 What: /sys/bus/usb/devices/usbX/bNum <<
413 Description: <<
414 Number of the possible configu <<
415 decimal. The current configura <<
416 <<
417 /sys/bus/usb/devices/u <<
418 <<
419 See USB specs for its meaning. <<
420 <<
421 What: /sys/bus/usb/devices/usbX/bNum <<
422 Description: <<
423 Number of endpoints used on th <<
424 <<
425 See USB specs for its meaning. <<
426 <<
427 What: /sys/bus/usb/devices/usbX/bNum <<
428 Description: <<
429 Number of interfaces on this d <<
430 <<
431 What: /sys/bus/usb/devices/usbX/busn <<
432 Description: <<
433 Number of the bus. <<
434 <<
435 What: /sys/bus/usb/devices/usbX/conf <<
436 Description: <<
437 Contents of the string descrip <<
438 current configuration. It may <<
439 of a device and/or its serial <<
440 <<
441 What: /sys/bus/usb/devices/usbX/desc <<
442 Description: <<
443 Contains the interface descrip <<
444 <<
445 What: /sys/bus/usb/devices/usbX/bos_ <<
446 Date: March 2024 <<
447 Contact: Elbert Mai <code@elbertmai.com> <<
448 Description: <<
449 Binary file containing the cac <<
450 of the device. This consists o <<
451 set of device capability descr <<
452 this file are in bus-endian fo <<
453 request the BOS from a device <<
454 <<
455 What: /sys/bus/usb/devices/usbX/idPr <<
456 Description: <<
457 Product ID, in hexadecimal. <<
458 <<
459 What: /sys/bus/usb/devices/usbX/idVe <<
460 Description: <<
461 Vendor ID, in hexadecimal. <<
462 <<
463 What: /sys/bus/usb/devices/usbX/devs <<
464 Description: <<
465 Displays the Device Tree Open <<
466 <<
467 What: /sys/bus/usb/devices/usbX/avoi <<
468 Description: <<
469 Most devices have this set to <<
470 <<
471 If the value is 1, enable a US <<
472 device to use reset. <<
473 <<
474 (read/write) <<
475 <<
476 What: /sys/bus/usb/devices/usbX/devn <<
477 Description: <<
478 USB interface device number, i <<
479 <<
480 What: /sys/bus/usb/devices/usbX/devp <<
481 Description: <<
482 String containing the USB inte <<
483 <<
484 What: /sys/bus/usb/devices/usbX/manu <<
485 Description: <<
486 Vendor specific string contain <<
487 manufacturer of the device. <<
488 <<
489 What: /sys/bus/usb/devices/usbX/maxc <<
490 Description: <<
491 Number of ports of an USB hub <<
492 <<
493 What: /sys/bus/usb/devices/usbX/pers <<
494 Description: <<
495 Keeps the device even if it ge <<
496 <<
497 What: /sys/bus/usb/devices/usbX/prod <<
498 Description: <<
499 Vendor specific string contain <<
500 device's product. <<
501 <<
502 What: /sys/bus/usb/devices/usbX/spee <<
503 Description: <<
504 Shows the device's max speed, <<
505 in Mbps. <<
506 Can be: <<
507 <<
508 ======= ====== <<
509 Unknown speed <<
510 1.5 Low sp <<
511 15 Full s <<
512 480 High S <<
513 5000 Super <<
514 10000 Super <<
515 20000 Super <<
516 ======= ====== <<
517 <<
518 What: /sys/bus/usb/devices/usbX/supp <<
519 Description: <<
520 Returns 1 if the device doesn' <<
521 Otherwise, returns 0. <<
522 <<
523 What: /sys/bus/usb/devices/usbX/urbn <<
524 Description: <<
525 Number of URBs submitted for t <<
526 <<
527 What: /sys/bus/usb/devices/usbX/vers <<
528 Description: <<
529 String containing the USB devi <<
530 at the BCD descriptor. <<
531 <<
532 What: /sys/bus/usb/devices/usbX/powe <<
533 Description: <<
534 Time in milliseconds for the d <<
535 value is negative, then autosu <<
536 <<
537 (read/write) <<
538 <<
539 What: /sys/bus/usb/devices/usbX/powe <<
540 Description: <<
541 The total time the device has <<
542 <<
543 What: /sys/bus/usb/devices/usbX/powe <<
544 Description: <<
545 The total time (in msec) that <<
546 <<
547 What: /sys/bus/usb/devices/usbX/powe <<
548 Description: <<
549 <<
550 What: /sys/bus/usb/devices/usbX/ep_< <<
551 Description: <<
552 The address of the endpoint de <<
553 in hexadecimal. The endpoint d <<
554 is also shown at: <<
555 <<
556 /sys/bus/usb/devices/u <<
557 <<
558 See USB specs for its meaning. <<
559 <<
560 What: /sys/bus/usb/devices/usbX/ep_< <<
561 Description: <<
562 The interval of the endpoint a <<
563 in hexadecimal. The actual int <<
564 of the USB. Also shown in time <<
565 /sys/bus/usb/devices/usbX/ep_< <<
566 <<
567 What: /sys/bus/usb/devices/usbX/ep_< <<
568 Description: <<
569 Number of bytes of the endpoin <<
570 <<
571 What: /sys/bus/usb/devices/usbX/ep_< <<
572 Description: <<
573 Attributes which apply to the <<
574 descriptor, in hexadecimal. Th <<
575 bitmapped field is also shown <<
576 <<
577 /sys/bus/usb/devices/u <<
578 <<
579 See USB specs for its meaning. <<
580 <<
581 What: /sys/bus/usb/devices/usbX/ep_< <<
582 Description: <<
583 Direction of the endpoint. Can <<
584 <<
585 - both (on control endpoin <<
586 - in <<
587 - out <<
588 <<
589 What: /sys/bus/usb/devices/usbX/ep_< <<
590 Description: <<
591 Interval for polling endpoint <<
592 milisseconds or microseconds. <<
593 <<
594 What: /sys/bus/usb/devices/usbX/ep_< <<
595 Description: <<
596 Descriptor type. Can be: <<
597 <<
598 - Control <<
599 - Isoc <<
600 - Bulk <<
601 - Interrupt <<
602 - unknown <<
603 <<
604 What: /sys/bus/usb/devices/usbX/ep_< <<
605 Description: <<
606 Maximum packet size this endpo <<
607 sending or receiving, in hexad <<
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