> -----Original Message----- > From: Felipe Balbi [mailto:balbi@xxxxxx] > Sent: Monday, January 19, 2015 7:59 PM > To: Krzysztof Opasiak > Cc: balbi@xxxxxx; linux-usb@xxxxxxxxxxxxxxx; > gregkh@xxxxxxxxxxxxxxxxxxx; bigeasy@xxxxxxxxxxxxx; > s.wadas@xxxxxxxxxxx; k.lewandowsk@xxxxxxxxxxx; > m.szyprowski@xxxxxxxxxxx; andrzej.p@xxxxxxxxxxx > Subject: Re: [PATCH] usb: gadget: composite: Provide list of > registered functions > > On Mon, Jan 19, 2015 at 02:17:19PM +0100, Krzysztof Opasiak wrote: > > Driver which provides implementation of some USB functions > registers > > usb_function_driver structure in composite framework. > > Function drivers are identifed using registered name. > > > > When gadget is composed using configfs user must know what names > has > > been registered. If function is compiled as a module this > information > > can be found in modules.alias file. If function is compiled-in, > there > > is no way to discover what usb functions are available in > currently > > running kernel. > > > > Such situation is nothing new for linux kernel. > > Similar situation is with file systems. While mounting user can > > provide an fs type argument using -t option in mount. > > Those type names are registered by drivers. To make those names > > discoverable there is a /proc/filesystems which exports the list > of > > currently registered file systems. > > > > This patch adds /proc/usb-functions attribute which exports the > list > > of currently registered function drivers. > > This allows user to discover list of both compiled-in functions > and > > from loaded kernel modules. > > > > Signed-off-by: Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx> > > you need to document the new file under Documentation/ABI/ > I have just sent v2 version with documentation. I have done some more research and it looks like /sys/kernel could be a good alternative if you find that proc usage is not a good idea. What do you thing? Should we continue with /proc/usb-functions or replace this patch with /sys/kernel/usb-functions or maybe /sys/kernel/usb-gadget/usb-functions to have a directory for some future attributes related to usb gadget? -- Krzysztof Opasiak Samsung R&D Institute Poland Samsung Electronics k.opasiak@xxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
