usb gadget serial: split out CDC ACM function
Split out CDC ACM parts of "gadget serial" to a "function driver". Some key structural differences from the previous ACM support, shared with with the generic serial function (next patch): - As a function driver, it can be combined with other functions. One gadget configuration could offer both serial and network links, as an example. - One serial port can be exposed in multiple configurations; the /dev/ttyGS0 node could be exposed regardless of which config the host selected. - One configuration can expose multiple serial ports, such as ttyGS0, ttyGS1, ttyGS2, and ttyGS3. This code should be a lot easier to understand than the previous all-in-one-big-file version of the driver. Signed-off-by:David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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drivers/usb/gadget/f_acm.c
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