usb: core: Add support to parse config summary capability descriptors
This descriptor describes the list of functions present in a given
configuration. There should be one such descriptor per configuration
supported by the device. The order in which these descriptors appear
in the BOS descriptor reflects the order of preference of configurations
as desired by the device for optimal functionality. Configuration Summary
descriptors are used by Host software to decide which Configuration to set
to obtain the desired functionality.
Change-Id: I7ec095ce19caa690c0d3dc0fdd3add5ad37a74f3
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index a8acc24..0e5ce0d 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -1051,6 +1051,30 @@
*/
#define USB_DT_USB_SSP_CAP_SIZE(ssac) (16 + ssac * 4)
+/*
+ * Configuration Summary descriptors: Defines a list of functions in the
+ * configuration. This descriptor may be used by Host software to decide
+ * which Configuration to use to obtain the desired functionality.
+ */
+#define USB_CAP_TYPE_CONFIG_SUMMARY 0x10
+
+struct function_class_info {
+ __u8 bClass;
+ __u8 bSubClass;
+ __u8 bProtocol;
+};
+
+struct usb_config_summary_descriptor {
+ __u8 bLength;
+ __u8 bDescriptorType;
+ __u8 bDevCapabilityType;
+ __u16 bcdVersion;
+ __u8 bConfigurationValue;
+ __u8 bMaxPower;
+ __u8 bNumFunctions;
+ struct function_class_info cs_info[];
+} __attribute__((packed));
+
/*-------------------------------------------------------------------------*/
/* USB_DT_WIRELESS_ENDPOINT_COMP: companion descriptor associated with