1
2
3
4config USB_DEBUG
5 bool "USB verbose debug messages"
6 help
7 Say Y here if you want the USB core & hub drivers to produce a bunch
8 of debug messages to the system log. Select this if you are having a
9 problem with USB support and want to see more of what is going on.
10
11config USB_ANNOUNCE_NEW_DEVICES
12 bool "USB announce new devices"
13 default N
14 help
15 Say Y here if you want the USB core to always announce the
16 idVendor, idProduct, Manufacturer, Product, and SerialNumber
17 strings for every new USB device to the syslog. This option is
18 usually used by distro vendors to help with debugging and to
19 let users know what specific device was added to the machine
20 in what location.
21
22 If you do not want this kind of information sent to the system
23 log, or have any doubts about this, say N here.
24
25comment "Miscellaneous USB options"
26
27config USB_DEFAULT_PERSIST
28 bool "Enable USB persist by default"
29 default y
30 help
31 Say N here if you don't want USB power session persistence
32 enabled by default. If you say N it will make suspended USB
33 devices that lose power get reenumerated as if they had been
34 unplugged, causing any mounted filesystems to be lost. The
35 persist feature can still be enabled for individual devices
36 through the power/persist sysfs node. See
37 Documentation/usb/persist.txt for more info.
38
39 If you have any questions about this, say Y here, only say N
40 if you know exactly what you are doing.
41
42config USB_DYNAMIC_MINORS
43 bool "Dynamic USB minor allocation"
44 help
45 If you say Y here, the USB subsystem will use dynamic minor
46 allocation for any device that uses the USB major number.
47 This means that you can have more than 16 of a single type
48 of device (like USB printers).
49
50 If you are unsure about this, say N here.
51
52config USB_OTG
53 bool "OTG support"
54 depends on PM_RUNTIME
55 default n
56 help
57 The most notable feature of USB OTG is support for a
58 "Dual-Role" device, which can act as either a device
59 or a host. The initial role is decided by the type of
60 plug inserted and can be changed later when two dual
61 role devices talk to each other.
62
63 Select this only if your board has Mini-AB/Micro-AB
64 connector.
65
66config USB_OTG_WHITELIST
67 bool "Rely on OTG Targeted Peripherals List"
68 depends on USB_OTG || EXPERT
69 default y if USB_OTG
70 help
71 If you say Y here, the "otg_whitelist.h" file will be used as a
72 product whitelist, so USB peripherals not listed there will be
73 rejected during enumeration. This behavior is required by the
74 USB OTG specification for all devices not on your product's
75 "Targeted Peripherals List". "Embedded Hosts" are likewise
76 allowed to support only a limited number of peripherals.
77
78 Otherwise, peripherals not listed there will only generate a
79 warning and enumeration will continue. That's more like what
80 normal Linux-USB hosts do (other than the warning), and is
81 convenient for many stages of product development.
82
83config USB_OTG_BLACKLIST_HUB
84 bool "Disable external hubs"
85 depends on USB_OTG || EXPERT
86 help
87 If you say Y here, then Linux will refuse to enumerate
88 external hubs. OTG hosts are allowed to reduce hardware
89 and software costs by not supporting external hubs. So
90 are "Embedded Hosts" that don't offer OTG support.
91
92
