Documentation/usb/gadget_configfs.rst

50 http://www.spinics.net/lists/linux-usb/msg76388.html)
55 	$ mount none $CONFIGFS_HOME -t configfs
60 -----------------------
104 ------------------------------
134 -------------------------
150 Each function provides its specific set of attributes, with either read-only
151 or read-write access. Where applicable they need to be written to as
153 Please refer to Documentation/ABI/testing/configfs-usb-gadget for more information.
156 ------------------------------------------------------
164 	$ ln -s functions/<name>.<instance name> configs/<name>.<number>
168 	$ ln -s functions/ncm.usb0 configs/c.1
175 ----------------------
190   ./configs/c.1/ncm.usb0 -> ../../../../usb_gadget/g1/functions/ncm.usb0
223 	$ echo s3c-hsotg > UDC
227 -----------------------
234 --------------
309 In configfs there are items and groups, both represented as directories.
311 other groups. In the picture below only an item is shown.
312 Both items and groups can have attributes, which are represented as files.
314 which can be read-only or read-write, depending on what they represent.
316 The filesystem part of configfs operates on config_items/groups and
318 configured elements. However, they are embedded in usage-specific
327      +--sa    (file)
349                          +----------------------------------+
351   +-----------------+    |  (*store)(cs *, buffer, length); |
353   | +-------------+ |    |       +------------------+       |
354   | | struct      |-|----|------>|struct            |       |
356   | +-------------+ |    |       +------------------+       |
357   |                 |    +----------------------------------+
360   +-----------------+                .
364 a number of its default sub-groups created automatically.
372 idProduct etc) and default sub-groups (configs, functions, strings).
374 appropriate locations. In the configs, functions and strings sub-groups
375 a user can create their sub-groups to represent configurations, functions,
376 and groups of strings in a given language.
387 	- gadget's config_group
388 	- gadget's default groups (configs, functions, strings)
389 	- associating functions with configurations (symlinks)