NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0644"
config USB_DYNAMIC_MINORS
- bool "Dynamic USB minor allocation (EXPERIMENTAL)"
- depends on USB && EXPERIMENTAL
+ bool "Dynamic USB minor allocation"
+ depends on USB
help
If you say Y here, the USB subsystem will use dynamic minor
allocation for any device that uses the USB major number.
If you are unsure about this, say N here.
-config USB_PERSIST
- bool "USB device persistence during system suspend (DANGEROUS)"
- depends on USB && PM && EXPERIMENTAL
- default n
- help
-
- If you say Y here and enable the "power/persist" attribute
- for a USB device, the device's data structures will remain
- persistent across system suspend, even if the USB bus loses
- power. (This includes hibernation, also known as swsusp or
- suspend-to-disk.) The devices will reappear as if by magic
- when the system wakes up, with no need to unmount USB
- filesystems, rmmod host-controller drivers, or do anything
- else.
-
- WARNING: This option can be dangerous!
-
- If a USB device is replaced by another of the same type while
- the system is asleep, there's a good chance the kernel won't
- detect the change. Likewise if the media in a USB storage
- device is replaced. When this happens it's almost certain to
- cause data corruption and maybe even crash your system.
-
- If you are unsure, say N here.
-
config USB_OTG
bool
depends on USB && EXPERIMENTAL
config USB_OTG_WHITELIST
bool "Rely on OTG Targeted Peripherals List"
- depends on USB_OTG
- default y
+ depends on USB_OTG || EMBEDDED
+ default y if USB_OTG
+ default n if EMBEDDED
help
If you say Y here, the "otg_whitelist.h" file will be used as a
product whitelist, so USB peripherals not listed there will be
rejected during enumeration. This behavior is required by the
USB OTG specification for all devices not on your product's
- "Targeted Peripherals List".
+ "Targeted Peripherals List". "Embedded Hosts" are likewise
+ allowed to support only a limited number of peripherals.
Otherwise, peripherals not listed there will only generate a
warning and enumeration will continue. That's more like what
config USB_OTG_BLACKLIST_HUB
bool "Disable external hubs"
- depends on USB_OTG
+ depends on USB_OTG || EMBEDDED
help
If you say Y here, then Linux will refuse to enumerate
external hubs. OTG hosts are allowed to reduce hardware
- and software costs by not supporting external hubs.
+ and software costs by not supporting external hubs. So
+ are "Embedded Hosts" that don't offer OTG support.