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authorRobin Getz <rgetz@blackfin.uclinux.org>2008-03-05 23:17:38 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-24 21:16:40 -0700
commit22552b286b44b8988e08fb74379507a9b32521b0 (patch)
treeb19e2da5cabbc9e1411f1c4f3b00ded44d6ae4bd
parentb56394bf325820e9f338eaef2941f18b17b98098 (diff)
USB: partial USB embedded host support
This provides better support for USB "Embedded Host" functionality, which is a subset of the USB OTG options: * External hub support can be disabled; * USB peripherals not whitelisted in "otg_whitelist.h" will be rejected during enumeration. These options can allow some savings in software and support. Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/core/Kconfig13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index c15621d6457..fee864c9e62 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -111,14 +111,16 @@ config USB_OTG
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
@@ -127,9 +129,10 @@ config USB_OTG_WHITELIST
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 "Emedded Hosts" that don't offer OTG support.