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author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2012-12-23 21:10:00 +0100 |
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committer | Felipe Balbi <balbi@ti.com> | 2013-01-21 20:52:40 +0200 |
commit | de53c25447117eae6b3f8952f663f08a09e0dbb7 (patch) | |
tree | 3474ccbad34a526bd9a6826e4512162e4801cafb /net/9p | |
parent | 78f46f09a80a39fe646fe415a21435f2a05df6c2 (diff) |
usb: gadget: add some infracture to register/unregister functions
This patch provides an infrastructure to register & unregister a USB
function. This allows to turn a function into a module and avoid the
'#include "f_.*.c"' magic and we get a clear API / cut between the bare
gadget and its functions.
The concept is simple:
Each function defines the DECLARE_USB_FUNCTION_INIT macro whith an unique
name of the function and two allocation functions.
- one to create an "instance". The instance holds the current configuration
set. In case there are two usb_configudations with one function there will
be one instance and two usb_functions
- one to create an "function" from the instance.
The name of the instance is used to automaticaly load the module if it the
instance is not yet available.
The usb_function callbacks are slightly modified and extended:
- usb_get_function()
creates a struct usb_function inclunding all pointers (bind,
unbind,…). It uses the "instance" to map its configuration. So we can
have _two_ struct usb_function, one for each usb_configuration.
- ->unbind()
Since the struct usb_function was not allocated in ->bind() it should
not kfree()d here. This function should only reverse what happens in
->bind() that is request cleanup and the cleanup of allocated
descriptors.
- ->free_func()
a simple kfree() of the struct usb_function
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'net/9p')
0 files changed, 0 insertions, 0 deletions