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linux
1#
2# USB Core configuration
3#
4config USB_DEBUG
5 bool "USB verbose debug messages"
6 depends on USB
7 help
8 Say Y here if you want the USB core & hub drivers to produce a bunch
9 of debug messages to the system log. Select this if you are having a
10 problem with USB support and want to see more of what is going on.
11
12comment "Miscellaneous USB options"
13 depends on USB
14
15config USB_DEVICEFS
16 bool "USB device filesystem"
17 depends on USB
18 ---help---
19 If you say Y here (and to "/proc file system support" in the "File
20 systems" section, above), you will get a file /proc/bus/usb/devices
21 which lists the devices currently connected to your USB bus or
22 busses, and for every connected device a file named
23 "/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
24 device number; the latter files can be used by user space programs
25 to talk directly to the device. These files are "virtual", meaning
26 they are generated on the fly and not stored on the hard drive.
27
28 You may need to mount the usbfs file system to see the files, use
29 mount -t usbfs none /proc/bus/usb
30
31 For the format of the various /proc/bus/usb/ files, please read
32 <file:Documentation/usb/proc_usb_info.txt>.
33
34 Most users want to say Y here.
35
36config USB_BANDWIDTH
37 bool "Enforce USB bandwidth allocation (EXPERIMENTAL)"
38 depends on USB && EXPERIMENTAL
39 help
40 If you say Y here, the USB subsystem enforces USB bandwidth
41 allocation and will prevent some device opens from succeeding
42 if they would cause USB bandwidth usage to go above 90% of
43 the bus bandwidth.
44
45 If you say N here, these conditions will cause warning messages
46 about USB bandwidth usage to be logged and some devices or
47 drivers may not work correctly.
48
49config USB_DYNAMIC_MINORS
50 bool "Dynamic USB minor allocation (EXPERIMENTAL)"
51 depends on USB && EXPERIMENTAL
52 help
53 If you say Y here, the USB subsystem will use dynamic minor
54 allocation for any device that uses the USB major number.
55 This means that you can have more than 16 of a single type
56 of device (like USB printers).
57
58 If you are unsure about this, say N here.
59
60config USB_SUSPEND
61 bool "USB selective suspend/resume and wakeup (EXPERIMENTAL)"
62 depends on USB && PM && EXPERIMENTAL
63 help
64 If you say Y here, you can use driver calls or the sysfs
65 "power/state" file to suspend or resume individual USB
66 peripherals.
67
68 Also, USB "remote wakeup" signaling is supported, whereby some
69 USB devices (like keyboards and network adapters) can wake up
70 their parent hub. That wakeup cascades up the USB tree, and
71 could wake the system from states like suspend-to-RAM.
72
73 If you are unsure about this, say N here.
74
75
76config USB_OTG
77 bool
78 depends on USB && EXPERIMENTAL
79 select USB_SUSPEND
80 default n
81
82
83config USB_OTG_WHITELIST
84 bool "Rely on OTG Targeted Peripherals List"
85 depends on USB_OTG
86 default y
87 help
88 If you say Y here, the "otg_whitelist.h" file will be used as a
89 product whitelist, so USB peripherals not listed there will be
90 rejected during enumeration. This behavior is required by the
91 USB OTG specification for all devices not on your product's
92 "Targeted Peripherals List".
93
94 Otherwise, peripherals not listed there will only generate a
95 warning and enumeration will continue. That's more like what
96 normal Linux-USB hosts do (other than the warning), and is
97 convenient for many stages of product development.
98
99config USB_OTG_BLACKLIST_HUB
100 bool "Disable external hubs"
101 depends on USB_OTG
102 help
103 If you say Y here, then Linux will refuse to enumerate
104 external hubs. OTG hosts are allowed to reduce hardware
105 and software costs by not supporting external hubs.
106