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usb: gadget: composite: redirect setup requests 

If there are setup requests not directed to an endpont or an interface,
current config's setup() has been attempted so far.
This patch, in case the above fails, adds code which tries the setup() of
configuration's function if there is only one function in the configuration.

This behavior is required to provide equivalent of gadget zero with configfs.

The gadget zero has a "config driver" for sourcesink, but all it does is
delegating the request to the function proper. So when the equivalent gadget
is set up with configfs it needs to handle requests directed to
"config driver", but with configfs it is not possible to specify
"config drivers".

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2013-11-07 08:41:25 +01:00 committed by Felipe Balbi
parent 5ace3d00fa
commit a01091e5ce
1 changed files with 15 additions and 1 deletions
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16
drivers/usb/gadget/composite.c
View File

@ -1451,8 +1451,22 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
struct usb_configuration *c;
c = cdev->config;
if (c && c->setup)
if (!c)
goto done;
/* try current config's setup */
if (c->setup) {
value = c->setup(c, ctrl);
goto done;
}
/* try the only function in the current config */
if (!list_is_singular(&c->functions))
goto done;
f = list_first_entry(&c->functions, struct usb_function,
list);
if (f->setup)
value = f->setup(f, ctrl);
}
goto done;