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authorDavid Brownell <david-b@pacbell.net>2007-04-18 04:51:38 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-04-28 00:28:39 +0400
commitaa2ce5ca6be480cb139e21258671c2c27826f8ff (patch)
treec6e0cf5fc2693de690fbb970ed8a9b0e9637bf35 /include
parent8c9862e512f59ae3f41f83c109be12f93e37bb2d (diff)
downloadlinux-aa2ce5ca6be480cb139e21258671c2c27826f8ff.tar.xz
USB: <linux/usb/ch9.h> minor doc update
Minor doc update to <linux/usb/ch9.h> ... say where USB_DT_CS_* came from and update the definitions to match how they're derived there. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/usb/ch9.h15
1 files changed, 9 insertions, 6 deletions
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 1122a6c2c1a3..6169438ec5a2 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -181,12 +181,15 @@ struct usb_ctrlrequest {
#define USB_DT_WIRE_ADAPTER 0x21
#define USB_DT_RPIPE 0x22
-/* conventional codes for class-specific descriptors */
-#define USB_DT_CS_DEVICE 0x21
-#define USB_DT_CS_CONFIG 0x22
-#define USB_DT_CS_STRING 0x23
-#define USB_DT_CS_INTERFACE 0x24
-#define USB_DT_CS_ENDPOINT 0x25
+/* Conventional codes for class-specific descriptors. The convention is
+ * defined in the USB "Common Class" Spec (3.11). Individual class specs
+ * are authoritative for their usage, not the "common class" writeup.
+ */
+#define USB_DT_CS_DEVICE (USB_TYPE_CLASS | USB_DT_DEVICE)
+#define USB_DT_CS_CONFIG (USB_TYPE_CLASS | USB_DT_CONFIG)
+#define USB_DT_CS_STRING (USB_TYPE_CLASS | USB_DT_STRING)
+#define USB_DT_CS_INTERFACE (USB_TYPE_CLASS | USB_DT_INTERFACE)
+#define USB_DT_CS_ENDPOINT (USB_TYPE_CLASS | USB_DT_ENDPOINT)
/* All standard descriptors have these 2 fields at the beginning */
struct usb_descriptor_header {