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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>

authored by

David Brownell and committed by
Greg Kroah-Hartman aa2ce5ca 8c9862e5

+9 -6
+9 -6
include/linux/usb/ch9.h
··· 181 181 #define USB_DT_WIRE_ADAPTER 0x21 182 182 #define USB_DT_RPIPE 0x22 183 183 184 - /* conventional codes for class-specific descriptors */ 185 - #define USB_DT_CS_DEVICE 0x21 186 - #define USB_DT_CS_CONFIG 0x22 187 - #define USB_DT_CS_STRING 0x23 188 - #define USB_DT_CS_INTERFACE 0x24 189 - #define USB_DT_CS_ENDPOINT 0x25 184 + /* Conventional codes for class-specific descriptors. The convention is 185 + * defined in the USB "Common Class" Spec (3.11). Individual class specs 186 + * are authoritative for their usage, not the "common class" writeup. 187 + */ 188 + #define USB_DT_CS_DEVICE (USB_TYPE_CLASS | USB_DT_DEVICE) 189 + #define USB_DT_CS_CONFIG (USB_TYPE_CLASS | USB_DT_CONFIG) 190 + #define USB_DT_CS_STRING (USB_TYPE_CLASS | USB_DT_STRING) 191 + #define USB_DT_CS_INTERFACE (USB_TYPE_CLASS | USB_DT_INTERFACE) 192 + #define USB_DT_CS_ENDPOINT (USB_TYPE_CLASS | USB_DT_ENDPOINT) 190 193 191 194 /* All standard descriptors have these 2 fields at the beginning */ 192 195 struct usb_descriptor_header {