Here I present the conversion of everthing that is required to provide
the equivalent of g_ncm.ko with configfs.
This is the second version of the series after discussion with Alan
and Michal's review - thank you guys.
A branch will be available here (from 24th April 2013):
git://git.infradead.org/users/kmpark/linux-samsung usb-gadget-configfs
v1..v2:
- delayed registering a network interface until gadgets's bind
(per Alan's request)
- created a helper macro to define USB Ethernet modules' parameters (Michal's
review)
- fixed and simplified some helper functions (Michal's review)
- changed hostaddr variable name to host_mac in several modules
(Michal's review)
BACKWARD COMPATIBILITY
==
Please note that the old g_ncm.ko is still available and works.
USING THE NEW GADGET
==
Please refer to this post:
http://www.spinics.net/lists/linux-usb/msg76388.html
for general information from Sebastian on how to use configfs-based
gadgets (*).
Here is the description specific to using g_ncm.ko equivalent.
The old g_ncm.ko offered three parameters:
qmult - queue length multiplier for high/super -speed devices
dev_addr - device's MAC address
host_addr - host's MAC address
With configfs the procedure is as follows, compared to the information
mentioned above (*):
instead of mkdir functions/acm.ttyS1 do
mkdir functions/ncm.instance name
e.g. mkdir functions/ncm.usb0
In functions/ncm.instance name there will be the following attribute files:
qmult
dev_addr
host_addr
ifname
and after creating the functions/ncm.instance name they contain default
values: qmult is 5, dev_addr and host_addr are randomly selected.
Except for ifname they can be written to until the function is linked to a
configuration. The ifname is read-only and contains the name of the interface
which was assigned by the net core, e. g. usb0.
The rest of the procedure (*) remains the same.
After unbinding the gadget with echo UDC
the symbolic links in the configuration directory can be removed,
the strings/* subdirectories in the configuration directory can
be removed, the strings/* subdirectories at the gadget level can
be removed and the configs/* subdirectories can be removed.
The functions/* subdirectories can be removed.
After that the gadget directory can be removed.
After that the respective modules can be unloaded.
TESTING THE FUNCTIONS (actually there is just one)
==
ncm)
On the device: ping host's IP
On the host: ping device's IP
Andrzej Pietrasiewicz (8):
usb/gadget: u_ether: convert into module
usb/gadget: rndis: convert into module
usb/gadget: u_ether: construct with default values and add
setters/getters
usb/gadget: f_ncm: convert to new function interface with backward
compatibility
usb/gadget: ncm: convert to new function interface
usb/gadget: f_ncm: remove compatibility layer
usb/gadget: f_ncm: use usb_gstrings_attach
usb/gadget: f_ncm: add configfs support
drivers/usb/gadget/Kconfig | 20 +++
drivers/usb/gadget/Makefile |5 +
drivers/usb/gadget/cdc2.c| 10 +-
drivers/usb/gadget/ether.c | 18 ++-
drivers/usb/gadget/f_ncm.c | 323 +-
drivers/usb/gadget/g_ffs.c | 15 ++-
drivers/usb/gadget/multi.c | 15 ++-
drivers/usb/gadget/ncm.c | 58 +---
drivers/usb/gadget/nokia.c | 11 +-
drivers/usb/gadget/rndis.c | 16 ++
drivers/usb/gadget/rndis.h |1 +
drivers/usb/gadget/u_ether.c | 223 ++---
drivers/usb/gadget/u_ether.h | 155 +++-
drivers/usb/gadget/u_ncm.h | 35 +
14 files changed, 765 insertions(+), 140 deletions(-)
create mode 100644 drivers/usb/gadget/u_ncm.h
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