Hi all,
Over the past few years, handhelds.org has been maintaining a small gadget
inside of its own tree called "g_char". g_char was spawned in the days
before g_serial, as a response to the new USB gadget API's replacement of
the old way of doing things (usb_char talking to gadget controller drivers
with no common API). [1]
Recently, I found that g_serial was a little too complex for our needs for a
current project (Linux as Bootloader), so I decided to spend some hours
resurrecting g_char, and I think I have it in a state in which it's ready to
push upstream.
g_char is a g_zero-derived gadget, as many others are, supporting one
configuration. It registers a misc device (10, 240 -- is there something I
should be doing with this that's better? I believe that's what usb-char did
in the past), which can be opened once the gadget has been bound. Reads are
buffered, but writes are not. It emulates a seriial device in that it does
not error if there is nothing on the other side, which is a characteristic
that is vital for LAB (at the moment).
It is not as fully functional as g_serial, but it does not intend to be --
its main goal is to stay small in a situation where every byte counts:
text data bss dec hex filename
14454 596 332 15382 3c16 drivers/usb/gadget/g_serial.o
6220 484 104 6808 1a98 drivers/usb/gadget/g_char.o
[EMAIL PROTECTED]:~/Code/iPAQ/kernel26$ wc -l drivers/usb/gadget/serial.c
drivers/usb/gadget/char.c
2437 drivers/usb/gadget/serial.c
921 drivers/usb/gadget/char.c
It can be presently retrieved from handhelds.org CVS, or downloaded from my
site[2].
The requisite line in Makefile is as such:
g_serial-objs := serial.o usbstring.o config.o epautoconf.o
and the requisite Kconfig goo is as such:
config USB_G_CHAR
tristate "Character Gadget"
help
Character Gadget is what usb-char used to be. Have fun.
I understand that it'll probably not be ready for a commit now, but it's a
lot cleaner than it used to be. Can someone run a pair of eyes over it and
tell me if anything is glaringly preventing it from going into the tree?
Thanks,
joshua
[1] http://marc.theaimsgroup.com/?l=linux-usb-devel&m=106254956522642&w=2
[2] http://joshuawise.com/char.c
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