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usb: gadget: configfs: OS Extended Properties descriptors support

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Add handling of OS Extended Properties descriptors from configfs interface.
One kind of "OS Descriptors" are "Extended Properties" descriptors, which
need to be specified per interface or per group of interfaces described
by an IAD. This patch adds support for creating subdirectories
in interface.<n> directory located in the function's directory.
Names of subdirectories created become names of properties.
Each property contains two attributes: "type" and "data".
The type can be a numeric value 1..7 while data is a blob interpreted
depending on the type specified.
The types are:
1 - unicode string
2 - unicode string with environment variables
3 - binary
4 - little-endian 32-bit
5 - big-endian 32-bit
6 - unicode string with a symbolic link
7 - multiple unicode strings

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2014-05-08 14:06:28 +02:00 • committed by Felipe Balbi
parent a747b0958b
commit 7419485f19
3 changed files with 226 additions and 0 deletions
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4
include/linux/usb/composite.h
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@ -64,6 +64,7 @@ struct usb_configuration;
* @name: Extended Property name
* @data_len: Length of Extended Property blob (for unicode store double len)
* @data: Extended Property blob
* @item: Represents this Extended Property in configfs
*/
struct usb_os_desc_ext_prop {
struct list_head entry;
@ -72,6 +73,7 @@ struct usb_os_desc_ext_prop {
char *name;
int data_len;
char *data;
struct config_item item;
};
/**
@ -82,6 +84,7 @@ struct usb_os_desc_ext_prop {
* @ext_prop_count: Number of Extended Properties
* @opts_mutex: Optional mutex protecting config data of a usb_function_instance
* @group: Represents OS descriptors associated with an interface in configfs
* @owner: Module associated with this OS descriptor
*/
struct usb_os_desc {
char *ext_compat_id;
@ -90,6 +93,7 @@ struct usb_os_desc {
int ext_prop_count;
struct mutex *opts_mutex;
struct config_group group;
struct module *owner;
};
/**