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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-12-03 09:44:34 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 11:55:27 -0800
commit91017f9cf5fcfb601b8d583c896ac7de7d200c57 (patch)
treeca601c606ded366e14df0ac019ecd4c43c5b11d9 /include/linux
parent06df572909080786e128eabdb2e39a12bce239de (diff)
USB: Refactor code to find alternate interface settings.
Refactor out the code to find alternate interface settings into usb_find_alt_setting(). Print a debugging message and return null if the alt setting is not found. While we're at it, correct a bug in the refactored code. The interfaces in the configuration's interface cache are not necessarily in numerical order, so we can't just use the interface number as an array index. Loop through the interface caches, looking for the correct interface. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/usb.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 6af3581e111..e101a2d04d7 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -619,6 +619,10 @@ extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
unsigned ifnum);
extern struct usb_host_interface *usb_altnum_to_altsetting(
const struct usb_interface *intf, unsigned int altnum);
+extern struct usb_host_interface *usb_find_alt_setting(
+ struct usb_host_config *config,
+ unsigned int iface_num,
+ unsigned int alt_num);
/**