usb: gadget: f_fs: add usb_functionfs_descs_head_v2 structure

The structure can be used with user space tools that use the new
functionfs description format, for example as follows:

static const struct {
	struct usb_functionfs_descs_head_v2 header;
	__le32 fs_count;
	__le32 hs_count;
	struct {
		…
	} fs_desc;
	struct {
		…
	} hs_desc;
} descriptors = {
	.header = {
		.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
		.length = cpu_to_le32(sizeof(descriptors)),
		.flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
				     FUNCTIONFS_HAS_HS_DESC)
	},
	.fs_count = cpu_to_le32(X),
	.fs_desc = {
		…
	},
	.hs_count = cpu_to_le32(Y),
	.hs_desc = {
		…
	}
};

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h
index 0154b28..3ca03de 100644 (file)
--- a/include/uapi/linux/usb/functionfs.h
+++ b/include/uapi/linux/usb/functionfs.h
@@ -32,6 +32,16 @@ struct usb_endpoint_descriptor_no_audio {
        __u8  bInterval;
 } __attribute__((packed));
 
+struct usb_functionfs_descs_head_v2 {
+       __le32 magic;
+       __le32 length;
+       __le32 flags;
+       /*
+        * __le32 fs_count, hs_count, fs_count; must be included manually in
+        * the structure taking flags into consideration.
+        */
+} __attribute__((packed));
+
 /* Legacy format, deprecated as of 3.14. */
 struct usb_functionfs_descs_head {
        __le32 magic;