1# SPDX-License-Identifier: GPL-2.0
  2#
  3# USB Core configuration
  4#
 
 
 
 
 
 
 
 
  5config USB_ANNOUNCE_NEW_DEVICES
  6	bool "USB announce new devices"
 
 
  7	help
  8	  Say Y here if you want the USB core to always announce the
  9	  idVendor, idProduct, Manufacturer, Product, and SerialNumber
 10	  strings for every new USB device to the syslog.  This option is
 11	  usually used by distro vendors to help with debugging and to
 12	  let users know what specific device was added to the machine
 13	  in what location.
 14
 15	  If you do not want this kind of information sent to the system
 16	  log, or have any doubts about this, say N here.
 17
 18comment "Miscellaneous USB options"
 19
 20config USB_DEFAULT_PERSIST
 21	bool "Enable USB persist by default"
 22	default y
 23	help
 24	  Say N here if you don't want USB power session persistence
 25	  enabled by default.  If you say N it will make suspended USB
 26	  devices that lose power get reenumerated as if they had been
 27	  unplugged, causing any mounted filesystems to be lost.  The
 28	  persist feature can still be enabled for individual devices
 29	  through the power/persist sysfs node. See
 30	  Documentation/driver-api/usb/persist.rst for more info.
 31
 32	  If you have any questions about this, say Y here, only say N
 33	  if you know exactly what you are doing.
 34
 35config USB_FEW_INIT_RETRIES
 36	bool "Limit USB device initialization to only a few retries"
 37	help
 38	  When a new USB device is detected, the kernel tries very hard
 39	  to initialize and enumerate it, with lots of nested retry loops.
 40	  This almost always works, but when it fails it can take a long time.
 41	  This option tells the kernel to make only a few retry attempts,
 42	  so that the total time required for a failed initialization is
 43	  no more than 30 seconds (as required by the USB OTG spec).
 44
 45	  Say N here unless you require new-device enumeration failure to
 46	  occur within 30 seconds (as might be needed in an embedded
 47	  application).
 48
 49config USB_DYNAMIC_MINORS
 50	bool "Dynamic USB minor allocation"
 
 51	help
 52	  If you say Y here, the USB subsystem will use dynamic minor
 53	  allocation for any device that uses the USB major number.
 54	  This means that you can have more than 16 of a single type
 55	  of device (like USB printers).
 56
 57	  If you are unsure about this, say N here.
 58
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 59config USB_OTG
 60	bool "OTG support"
 61	depends on PM
 
 
 62	help
 63	  The most notable feature of USB OTG is support for a
 64	  "Dual-Role" device, which can act as either a device
 65	  or a host. The initial role is decided by the type of
 66	  plug inserted and can be changed later when two dual
 67	  role devices talk to each other.
 68
 69	  Select this only if your board has Mini-AB/Micro-AB
 70	  connector.
 71
 72config USB_OTG_PRODUCTLIST
 73	bool "Rely on OTG and EH Targeted Peripherals List"
 74	depends on USB
 
 75	help
 76	  If you say Y here, the "otg_productlist.h" file will be used as a
 77	  product list, so USB peripherals not listed there will be
 78	  rejected during enumeration.  This behavior is required by the
 79	  USB OTG and EH specification for all devices not on your product's
 80	  "Targeted Peripherals List".  "Embedded Hosts" are likewise
 81	  allowed to support only a limited number of peripherals.
 82
 83config USB_OTG_DISABLE_EXTERNAL_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
 92config USB_OTG_FSM
 93	tristate "USB 2.0 OTG FSM implementation"
 94	depends on USB && USB_OTG
 95	select USB_PHY
 96	help
 97	  Implements OTG Finite State Machine as specified in On-The-Go
 98	  and Embedded Host Supplement to the USB Revision 2.0 Specification.
 99
100config USB_LEDS_TRIGGER_USBPORT
101	tristate "USB port LED trigger"
102	depends on USB && LEDS_TRIGGERS
103	help
104	  This driver allows LEDs to be controlled by USB events. Enabling this
105	  trigger allows specifying list of USB ports that should turn on LED
106	  when some USB device gets connected.
107
108config USB_AUTOSUSPEND_DELAY
109	int "Default autosuspend delay"
110	depends on USB
111	default 2
112	help
113	  The default autosuspend delay in seconds.  Can be overridden
114	  with the usbcore.autosuspend command line or module parameter.
115
116	  The default value Linux has always had is 2 seconds.  Change
117	  this value if you want a different delay and cannot modify
118	  the command line or module parameter.

 
 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
12config USB_ANNOUNCE_NEW_DEVICES
13	bool "USB announce new devices"
14	depends on USB
15	default N
16	help
17	  Say Y here if you want the USB core to always announce the
18	  idVendor, idProduct, Manufacturer, Product, and SerialNumber
19	  strings for every new USB device to the syslog.  This option is
20	  usually used by distro vendors to help with debugging and to
21	  let users know what specific device was added to the machine
22	  in what location.
23
24	  If you do not want this kind of information sent to the system
25	  log, or have any doubts about this, say N here.
26
27comment "Miscellaneous USB options"
28	depends on USB
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
29
30config USB_DYNAMIC_MINORS
31	bool "Dynamic USB minor allocation"
32	depends on USB
33	help
34	  If you say Y here, the USB subsystem will use dynamic minor
35	  allocation for any device that uses the USB major number.
36	  This means that you can have more than 16 of a single type
37	  of device (like USB printers).
38
39	  If you are unsure about this, say N here.
40
41config USB_SUSPEND
42	bool "USB runtime power management (autosuspend) and wakeup"
43	depends on USB && PM_RUNTIME
44	help
45	  If you say Y here, you can use driver calls or the sysfs
46	  "power/control" file to enable or disable autosuspend for
47	  individual USB peripherals (see
48	  Documentation/usb/power-management.txt for more details).
49
50	  Also, USB "remote wakeup" signaling is supported, whereby some
51	  USB devices (like keyboards and network adapters) can wake up
52	  their parent hub.  That wakeup cascades up the USB tree, and
53	  could wake the system from states like suspend-to-RAM.
54
55	  If you are unsure about this, say N here.
56
57config USB_OTG
58	bool "OTG support"
59	depends on USB && EXPERIMENTAL
60	depends on USB_SUSPEND
61	default n
62	help
63	  The most notable feature of USB OTG is support for a
64	  "Dual-Role" device, which can act as either a device
65	  or a host. The initial role is decided by the type of
66	  plug inserted and can be changed later when two dual
67	  role devices talk to each other.
68
69	  Select this only if your board has Mini-AB/Micro-AB
70	  connector.
71
72config USB_OTG_WHITELIST
73	bool "Rely on OTG Targeted Peripherals List"
74	depends on USB_OTG || EXPERT
75	default y if USB_OTG
76	help
77	  If you say Y here, the "otg_whitelist.h" file will be used as a
78	  product whitelist, so USB peripherals not listed there will be
79	  rejected during enumeration.  This behavior is required by the
80	  USB OTG specification for all devices not on your product's
81	  "Targeted Peripherals List".  "Embedded Hosts" are likewise
82	  allowed to support only a limited number of peripherals.
83
84	  Otherwise, peripherals not listed there will only generate a
85	  warning and enumeration will continue.  That's more like what
86	  normal Linux-USB hosts do (other than the warning), and is
87	  convenient for many stages of product development.
88
89config USB_OTG_BLACKLIST_HUB
90	bool "Disable external hubs"
91	depends on USB_OTG || EXPERT
92	help
93	  If you say Y here, then Linux will refuse to enumerate
94	  external hubs.  OTG hosts are allowed to reduce hardware
95	  and software costs by not supporting external hubs.  So
96	  are "Embedded Hosts" that don't offer OTG support.
97