gb_module_interface_init() looks for the interface corresponding
to the supplied interface_id, but fails to configure the
device_id that goes with it. This results in a set route command
being set with an uninitialized and bogus value. Fix it.
Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We don't need a callback for bulk out urbs to do anything except put the
urb back in the pool.  Document why we do this and what is involved.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We aren't using an id_table for "drivers" at this moment, as the whole
driver model interaction is under heavy rework.  So remove these for now
to keep things easier to understand for future patches.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Remove some #if 0 chunks for the old-style greybus driver macros
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

No one is using sdio yet, but convert to the connection interface to
remove the last user of the "old" module interface.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We aren't going to have individual modules for the gb protocols, so just
remove this useless code, it was throwing up warnings in sparse.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

This is part 1 of abstracting the connection operations into a set
of methods.  This will avoid some big switch statements, but more
importantly this will be needed for supporting multiple versions of
each protocol.

For now only two methods are defined.  The init method is used
to set up the device (or whatever the CPort represents) and the exit
method tears it down.  There may need to be additional operations
added in the future, and once versioning is used we might stash
the version number in this structure as well.

The next patch adds dynamic registratration of these protocol
handlers, and will do away with the switch statement now found
in gb_connection_init().
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

This was added in 3.11, and we need it for 3.10
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We do properly check for duplicate module ids, as fixed in
008d85d90ae1ab31f1f7b80f245f6ee2eb5aed49 "module: don't create duplicate
module ids", so remove the XXX marker.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Now that we have proper reference counting for modules, interfaces, and
connections, no need to worry about grabbing a pointer to your "parent"
structure, all is good.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

The uart-gb code needs to init the tty core before it can add devices.
Previously we hard-coded this in the greybus core, move this to be
"dynamic" and self-contained within the uart-gb.c file.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Move the uart code over to use the "new" connection interface, instead
of the "old" module interface.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We don't need to dynamically allocate the i2c adapter structure, we
can just embed it right in struct gb_i2c_device.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

This field is never used (and not needed) so get rid of it.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

An operation is what can timeout, not a connection itself.  So notify
the operation timedout, and the connection can then do with it as it
sees fit, if necessary.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We can't do anything if killing a gbuf fails, so just make this function
"always" be successful.

At the same time, make the host controller function also be called
"kill_gbuf" to keep the terminology in sync.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: Alex Elder <elder@linaro.org>

When registering a host controller, verify that all of the needed
callbacks are present, so we don't have to do the testing on any "hot"
paths when we want to send real data.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: Alex Elder <elder@linaro.org.

Hook up gbuf_kill_gbuf() by implementing yet-another-host-controller
callback and a gbuf-specific pointer to hold the tracking data the hcd
needs in order to be able to abort a transfer.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Not like we are ever going to use a BE cpu, but it's good to be
"correct"...
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

One of which was "real".
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

If we somehow get a hotplug event for a module id that we already have
created[1], don't try to create it again, or sysfs will complain loudly.
Instead, abort the creation properly.

[1] If, for example, you happened to run a script on a greybus emulator
twice in a row...
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Use the connection, not the host controller, as the parent device of the
i2c device.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We were thinking that module attributes were known at the time the
device was created in the system, so we could query them to know if the
sysfs file was present or not.  Unfortunatly that's not the case, we
create the device before we parse the values, so just always show the
sysfs attributes.  If there is no such attribute, the sysfs file will be
empty (i.e. for the string attributes.)
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

I screwed up the error handling in a patch the other day.  If we get
an error on an input URB we should not re-submit it.
Signed-off-by: Alex Elder <elder@linaro.org>

This patch hooks up modules, interfaces, and connections to the driver
model.  Now we have a correct hierarchy, and drivers can be correctly
bound to the proper portions in the future.  Devices are correctly
reference counted and torn down in the proper order on removal of a
module.

Some basic sysfs attributes have been created for interfaces and
connections.  Module attributes are not working properly, but that will
be fixed in future changes.

This has been tested on Alex's machine, with multiple hotplug and unplug
operations of a module working correctly.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Rename and renumber the values for the AP ID service message
and related symbols to match the recently-updated spec.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

The route for a connection needs to be set *before* we initialize
the connection.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

We removed the DDB function messages from the spec as they are
not needed. Now remove it from the code.
Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Rather than bringing up all interfaces described in the manifest,
wait until we get a link up message, and at that time go initialize
the link.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Give svc_set_route_send() non-private scope so it can be used by a
function outside "ap.c" in the next patch.  Change its type so it
can tell its caller if an error occurs.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Define the state of a connection.  A connection will not be
enabled until it has been successfully set up.  Once it starts
getting torn down its state will move to "being destroyed".

Don't send any operation request messages unless the connection is
enabled.  And drop any incoming messages if if the connection is
not enabled.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Define a new function operation_cancel() that cancels an
outstanding operation.  Use it to clear out any operations that
might be pending at the time a connection is torn down.

Note:  This code isn't really functional yet, partially because
greybus_kill_gbuf() is not implemented.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Arrange for operation requests that takke too long to time out.
At the moment, nothing happens when that occurs (other than a silly
message getting printed).  When the connection and operation and
interface and module code are cleaned up properly, this event should
most likely cause the affected module to get torn down.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Also properly clean up all modules when you remove a host driver
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

When the AP receives a link up event, request that the SVC set a
route to the interface's device id (this device id has been
previously reported to the AP). In the future, we may not always
immediately set a route upon receiving a link up event but this
is sufficient for the known use cases at this time.
Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

CPort connections are being handled in the application layer connection
protocol and the layer 3 switch doesn't care about them. Also, the
switch doesn't care about a source device id when setting up the route
table. Reduce the message to just the necessary destination device ID.

As the SVC is aware of which switch port it found the module/interface
and assigned the device ID, we can simply tell the SVC to set a route
to the device ID it has reported to the AP as being active.
Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

The link up message is the event that tells the AP what device ID
has been assigned to a particular interface on a module during
enumeration. The link up is sent *only* after the hotplug event
for a particular module has been sent to the AP.

The link up payload must carry the Module ID and Interface ID
to uniquely identify the struct gb_interface to which the
Device ID has been assigned.

After processing of the link up message, the interface's device_id
field will contain the assigned Device ID so that the AP has the
information necessary to issue network route commands.
Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Add support for getting a struct gb_interface from an
Interface ID.
Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>