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authorDavid Brownell <david-b@pacbell.net>2006-04-02 10:18:09 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-14 11:12:23 -0700
commit89ccbdc91bc5a433fa256c0136fbe181d7c5d474 (patch)
tree7c0e78a7d908534db7d423d20cb8e6eea4ec62e4 /drivers/usb/core
parent4d45e21867bee51e3bb42e95bc2929231d7c8192 (diff)
[PATCH] USB: otg hub support is optional
USB OTG devices are not required to support external hubs. This adds a configuration option to disable that support. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/Kconfig7
-rw-r--r--drivers/usb/core/hub.c7
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index ff03184da40..a08787e253a 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -99,4 +99,11 @@ config USB_OTG_WHITELIST
normal Linux-USB hosts do (other than the warning), and is
convenient for many stages of product development.
+config USB_OTG_BLACKLIST_HUB
+ bool "Disable external hubs"
+ depends on USB_OTG
+ 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.
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 3c76f7e17c0..0c87f73f293 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -836,6 +836,13 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
desc = intf->cur_altsetting;
hdev = interface_to_usbdev(intf);
+#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
+ if (hdev->parent) {
+ dev_warn(&intf->dev, "ignoring external hub\n");
+ return -ENODEV;
+ }
+#endif
+
/* Some hubs have a subclass of 1, which AFAICT according to the */
/* specs is not defined, but it works */
if ((desc->desc.bInterfaceSubClass != 0) &&