platform/kernel/linux-rpi.git
9 years agogreybus: svc: remove the DDB function message support
Matt Porter [Wed, 22 Oct 2014 07:22:48 +0000 (03:22 -0400)]
greybus: svc: remove the DDB function message support

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>
9 years agogreybus: only initialize interfaces when up
Alex Elder [Wed, 22 Oct 2014 07:04:32 +0000 (02:04 -0500)]
greybus: only initialize interfaces when up

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>
9 years agogreybus: make svc_set_route_send() public
Alex Elder [Wed, 22 Oct 2014 07:04:31 +0000 (02:04 -0500)]
greybus: make svc_set_route_send() public

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>
9 years agogreybus: define connection state
Alex Elder [Wed, 22 Oct 2014 07:04:30 +0000 (02:04 -0500)]
greybus: define connection state

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>
9 years agogreybus: define operation_cancel()
Alex Elder [Wed, 22 Oct 2014 07:04:29 +0000 (02:04 -0500)]
greybus: define operation_cancel()

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>
9 years agogreybus: time out operation requests
Alex Elder [Wed, 22 Oct 2014 07:04:28 +0000 (02:04 -0500)]
greybus: time out operation requests

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>
9 years agogreybus: module: fix double free of module
Greg Kroah-Hartman [Wed, 22 Oct 2014 08:38:07 +0000 (16:38 +0800)]
greybus: module: fix double free of module

Also properly clean up all modules when you remove a host driver

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agogreybus: ap: add svc_set_route_send() command and use it on a link up event
Matt Porter [Wed, 22 Oct 2014 06:06:09 +0000 (02:06 -0400)]
greybus: ap: add svc_set_route_send() command and use it on a link up event

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>
9 years agogreybus: svc: remove unneeded fields from the unipro set route message payload
Matt Porter [Wed, 22 Oct 2014 06:06:08 +0000 (02:06 -0400)]
greybus: svc: remove unneeded fields from the unipro set route message payload

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>
9 years agogreybus: ap: process the UniPro link up message
Matt Porter [Wed, 22 Oct 2014 02:43:31 +0000 (22:43 -0400)]
greybus: ap: process the UniPro link up message

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>
9 years agogreybus: interface: add gb_interface_find()
Matt Porter [Wed, 22 Oct 2014 02:43:30 +0000 (22:43 -0400)]
greybus: interface: add gb_interface_find()

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>
9 years agogreybus: module: add gb_module_find()
Matt Porter [Wed, 22 Oct 2014 02:43:29 +0000 (22:43 -0400)]
greybus: module: add gb_module_find()

Add support for getting a struct gb_module from a
Module ID.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: battery-gb: Allow kernel values to get out of sync with greybus spec
Greg Kroah-Hartman [Tue, 21 Oct 2014 08:25:13 +0000 (16:25 +0800)]
greybus: battery-gb: Allow kernel values to get out of sync with greybus spec

We can't know that the greybus values and the kernel values for a number
of battery enumerated types will remain in sync.  And as theses are sent
by an external device from the kernel, we have to explicitly check these
values.

Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: battery-gb.c: fix memory leak found by Viresh
Greg Kroah-Hartman [Tue, 21 Oct 2014 07:51:53 +0000 (15:51 +0800)]
greybus: battery-gb.c: fix memory leak found by Viresh

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Merge branch 'gregkh_work' into master
Greg Kroah-Hartman [Tue, 21 Oct 2014 06:37:44 +0000 (14:37 +0800)]
greybus: Merge branch 'gregkh_work' into master

This pulls in the battery driver work I did there.

9 years agogreybus: ap: add support for the AP Device ID unipro management function message
Matt Porter [Tue, 21 Oct 2014 05:52:27 +0000 (01:52 -0400)]
greybus: ap: add support for the AP Device ID unipro management function message

The AP needs to know its assigned Device ID in order to establish
Greybus connections between CPorts. We could have pulled the Device
ID from the controller hardware in a driver specific manner, but
instead we define one generic message from the SVC to let the
AP know this information. Add this additional unipro management
message and handle it by setting the supplied Device ID in the
struct greybus_host_device. The greybus core will use this to
populate the source Device ID when establishing a connection
between the AP and another module's CPort.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: improve module cleanup code
Alex Elder [Tue, 21 Oct 2014 04:01:04 +0000 (23:01 -0500)]
greybus: improve module cleanup code

When a module gets destroyed all of its state and the state of its
interfaces and connections (etc.) need to be torn down.  This is
not now being done properly.  Add this teardown code.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: stash power supply pointer in connection
Alex Elder [Tue, 21 Oct 2014 04:01:03 +0000 (23:01 -0500)]
greybus: stash power supply pointer in connection

The battery code was not stashing a copy of its private data
pointer.  It'll be needed in the next patch.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix op_cycle logic
Alex Elder [Tue, 21 Oct 2014 04:01:02 +0000 (23:01 -0500)]
greybus: fix op_cycle logic

The function that computes the operation id for a connection is
wrongly using MOD rather than AND.  Fix that.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: battery-gb: Add battery communication with the module
Greg Kroah-Hartman [Tue, 21 Oct 2014 06:31:24 +0000 (14:31 +0800)]
greybus: battery-gb: Add battery communication with the module

This adds support to talk to the battery to get the various requests
made to it, based on the battery protocol defined in the Greybus
Specification.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: leverage ap_disconnect() in ap_probe()
Alex Elder [Mon, 20 Oct 2014 15:28:00 +0000 (10:28 -0500)]
greybus: leverage ap_disconnect() in ap_probe()

With a few minor changes, ap_disconnect() can correctly handle
cleaning up even a partially initialized USB interface.  Make those
changes, and then use ap_disconnect() to simplify cleanup for all
the error paths in ap_probe().  Reset all fields as they're cleaned
up to facilitate debugging.

Signed-off-by: Alex Elder <elder@linaro.org>
9 years agogreybus: move ap_disconnect()
Alex Elder [Mon, 20 Oct 2014 15:27:59 +0000 (10:27 -0500)]
greybus: move ap_disconnect()

The next patch has ap_probe() reference ap_disconnect().  To prepare
for that, move ap_disconnect() up in the file.

This is done as a separate commit to make it easier to see this move
involves no other change to that function.  This and the next commit
can be squashed if desired.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: remove cports and strings from gb_module
Alex Elder [Mon, 20 Oct 2014 15:27:58 +0000 (10:27 -0500)]
greybus: remove cports and strings from gb_module

We no longer keep copies of strings found in the manifuest in
a module's strings array, so we can get rid of the strings array.
Similarly, the new manifest parsing code sets up connections for
each cport id advertised for a module, so the cport array is
no longer needed either.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: drop gb_* device fields from gb_module
Alex Elder [Mon, 20 Oct 2014 15:27:57 +0000 (10:27 -0500)]
greybus: drop gb_* device fields from gb_module

A struct gb_module has a bunch of fields from the earlier skeleton
code, where a module was assumed to possibly have one of every
type of device available on the GP Bridge.  The manifest parsing
code changed it so these things will be related to connection
endpoints, so these gb_module fields are no longer needed.

A few of these (battery and sdio) haven't been implemented the "new
way" yet, so just leave a bit of the code that was there commented
out for now.

Also, gb_tty seems to be partially implemented and I don't want to
remove that without knowing where it's headed, so that one stays.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: create a slab cache for operations
Alex Elder [Mon, 20 Oct 2014 15:27:56 +0000 (10:27 -0500)]
greybus: create a slab cache for operations

Everything we do on greybus will involve an operation, so create a
slab cache for that frequently-allocated data structure.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: properly drop device reference
Alex Elder [Mon, 20 Oct 2014 15:27:55 +0000 (10:27 -0500)]
greybus: properly drop device reference

Drop the USB device reference taken at the top of ap_probe() in the
event greybus_create_hd() fails.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: .gitignore: minor updates
Viresh Kumar [Mon, 20 Oct 2014 11:16:18 +0000 (16:46 +0530)]
greybus: .gitignore: minor updates

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Fix parameters of core_param()
Viresh Kumar [Mon, 20 Oct 2014 11:15:50 +0000 (16:45 +0530)]
greybus: Fix parameters of core_param()

core_param() takes four parameters instead of three and so results in this
compilation error:

greybus/core.c:25:33: error: macro "core_param" requires 4 arguments, but only 3 given
 core_param(nogreybus, bool, 0444);
                                 ^

Fix this by adding proper arguments to it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: gpio-gb: fix offset error checking and usage
Matt Porter [Mon, 20 Oct 2014 10:39:45 +0000 (06:39 -0400)]
greybus: gpio-gb: fix offset error checking and usage

Offset (or hwgpio num) is the offset within a gpiochip, not the
unique gpio namespace number. Adjust the error checking and use
of offset in our operation calls to fix this.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add LED protocol numbers
Greg Kroah-Hartman [Mon, 20 Oct 2014 08:02:56 +0000 (16:02 +0800)]
greybus: add LED protocol numbers

9 years agogreybus: battery: some hooking up to the greybus core
Greg Kroah-Hartman [Mon, 20 Oct 2014 07:24:57 +0000 (15:24 +0800)]
greybus: battery: some hooking up to the greybus core

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: gpio-gb: remove unused status field from struct gb_gpio_get_value_request
Matt Porter [Mon, 20 Oct 2014 05:51:18 +0000 (01:51 -0400)]
greybus: gpio-gb: remove unused status field from struct gb_gpio_get_value_request

probably a cut and paste error got this unused status field. remove it.

Signed-off-by: Matt Porter <mporter@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: battery-gb: provide accessors for a few more functions
Greg Kroah-Hartman [Mon, 20 Oct 2014 07:09:49 +0000 (15:09 +0800)]
greybus: battery-gb: provide accessors for a few more functions

Put the hard coded values in a function to make it easier to see what
needs to be done here.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: gpio-gb: allow it to build properly for all current kernel versions.
Greg Kroah-Hartman [Mon, 20 Oct 2014 05:40:02 +0000 (13:40 +0800)]
greybus: gpio-gb: allow it to build properly for all current kernel versions.

GPIO remove changed the api for 3.17 to try to make up for some
previously foolish design decisions.  Handle that in kernel_ver.h to
make the code simple.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: greybus_manifest.h: fix up class protocol numbers to match the spec.
Greg Kroah-Hartman [Mon, 20 Oct 2014 05:27:42 +0000 (13:27 +0800)]
greybus: greybus_manifest.h: fix up class protocol numbers to match the spec.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: report gbuf errors
Alex Elder [Sat, 18 Oct 2014 02:03:49 +0000 (21:03 -0500)]
greybus: report gbuf errors

If a gbuf completion indicates an error has occurred, report it.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: update gbuf status for completion handlers
Alex Elder [Fri, 17 Oct 2014 10:18:22 +0000 (05:18 -0500)]
greybus: update gbuf status for completion handlers

Currently, if a USB urb completes with an error, that error status
is not transferred back to the gbuf that it's associated with.  For
inbound data there's not a lot we can do about an error, but for
outbound data, this means there is no notification to the submitter
that something went wrong.

For outbound data copy the urb status directly back to the gbuf as
its status.  Follow USB's lead and set the status to -EINPROGRESS
while a gbuf is "in flight."  Assign a gbuf an initial status value
of -EBADR to help identify use of never-set status values.

When an inbound urb fails (SVC or CPort), currently the urb is just
leaked, more or less (i.e., we lose an urb posted to receive
incoming data).  Change that so such an error is reported, but
then re-submitted.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add write retry support for i2c
Alex Elder [Fri, 17 Oct 2014 10:09:21 +0000 (05:09 -0500)]
greybus: add write retry support for i2c

It is expected that i2c writes may fail, and in that case the driver
simply retries some number of times before actually treating it as a
failure.  Define a GB_OP_RETRY status, which is interpreted by the
i2c driver as an indication a retry is in order.  We just translate
that into an EAGAIN error passed back to the i2c core.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: initial operations-based GPIO driver
Alex Elder [Thu, 16 Oct 2014 11:35:39 +0000 (06:35 -0500)]
greybus: initial operations-based GPIO driver

First cut.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add i2c driver
Alex Elder [Thu, 16 Oct 2014 11:35:38 +0000 (06:35 -0500)]
greybus: add i2c driver

This patch adds the i2c driver, based on the use of Greybus operations
over Greybus connections.  It basically replaces almost all of what
was previously found in "i2c-gb.c".

When gb_connection_device_init(connection) is called, any connection
that talks the GREYBUS_PROTOCOL_I2C is passed to gb_i2c_device_init()
to be initialized.

Initialization involves verifying the code is able to support the
version of the protocol.  For I2C, we then query the functionality
mask, and set the retry count and timeout to default values.

After that, we set up the i2c device and associate it with the
connection.  The i2c_algorithm methods are then implemented
by translating them into Greybus operations.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill old cport handlers
Alex Elder [Thu, 16 Oct 2014 11:35:37 +0000 (06:35 -0500)]
greybus: kill old cport handlers

The original CPort message handlers are not needed.  All incoming
data is passed to handlers based on the protocol used over the
connection over which the data was transferred.  So get rid of the
old CPort handler code.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill off gbuf work queue
Alex Elder [Thu, 16 Oct 2014 11:35:36 +0000 (06:35 -0500)]
greybus: kill off gbuf work queue

At this point all incoming messages are handled by the operation
code, so this obviates the need for the gbuf workqueue.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add device initialization
Alex Elder [Thu, 16 Oct 2014 11:35:35 +0000 (06:35 -0500)]
greybus: add device initialization

Set up the infrastructure for initializing connections based on
their protocol.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: move receive handling to operation layer
Alex Elder [Thu, 16 Oct 2014 11:35:34 +0000 (06:35 -0500)]
greybus: move receive handling to operation layer

Create a work queue to do the bulk of processing of received
operation request or response messages.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: let operation layer examine incoming data
Alex Elder [Thu, 16 Oct 2014 11:35:33 +0000 (06:35 -0500)]
greybus: let operation layer examine incoming data

Give the operation layer a chance to examine incoming data so that
it can handle it appropriately.

Treat the data as an operation message header.  If it's a response,
look up the operation it's associated with.  If it's not, create a
new operation.  Copy the incoming data into the request or response
buffer.  The next patch adds a work queue to pick up handling
the request or response from there.

Get rid of gb_operation_submit().  Instead, we have two functions,
one for sending an operation's request message, the other for
sending an operation's response message.

Not fully functional yet, still just filling things in...

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add gb_operation_find()
Alex Elder [Thu, 16 Oct 2014 11:35:32 +0000 (06:35 -0500)]
greybus: add gb_operation_find()

Add a red-black tree indexed by operation id to a connection to
allow pending operations (whose requests are in-flight) to be
found when their matching response is recieved.

Assign the id at the time an operation is inserted, and update
the operation's message header(s) to include it.

Rename gb_connection_op_id() to be more consistent with the
naming conventions being used elsewhere.

(Noting now that this may switch to a simple list implementation
based on Greg's assertion that lists are faster than red-black trees
for up to a few hundred entries.)

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add response buffer to an operation
Alex Elder [Thu, 16 Oct 2014 11:35:31 +0000 (06:35 -0500)]
greybus: add response buffer to an operation

We need to track both request messages and response messages in
operations.  So add another gbuf (and payload pointer) field to
the operation structure, and rename them to indicate which one
is which.  Allow the creator specify the size of the response
buffer; just leave it a null pointer if the size is 0.

Define a new helper function gb_operation_gbuf_create() to
encapsulate creating either a request or a response buffer.

Any buffer associated with a connection will (eventually) have been
created as part of an operation.  So stash the operation pointer in
the gbuf as the context pointer.  Whether a buffer is for the
request or the response can be determined by pointer comparison.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: stop init_subdevs stuff
Alex Elder [Thu, 16 Oct 2014 11:35:30 +0000 (06:35 -0500)]
greybus: stop init_subdevs stuff

Upcoming patches are going to set up devices based on what is
discovered in the module manifest.  Get rid of the hard-coded
initialization done by gb_init_subdevs(), along with other related
code.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: drop hd arg from submit_gbuf method
Alex Elder [Thu, 16 Oct 2014 11:35:29 +0000 (06:35 -0500)]
greybus: drop hd arg from submit_gbuf method

Every gbuf is associated with a connection when it is created.  And
a connection contains a pointer to the host device that will carry
messages.  So there's no need for the submit_gbuf() method to have
the host device pointer passed to it, the function can get it from
the gbuf's connection.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: zero all data buffers
Alex Elder [Thu, 16 Oct 2014 11:35:28 +0000 (06:35 -0500)]
greybus: zero all data buffers

Don't assume the buffer data area will all be overwritten.  Zero all
buffer space, to avoid sending crap over the wire.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: don't restrict input buffer size
Alex Elder [Thu, 16 Oct 2014 11:35:27 +0000 (06:35 -0500)]
greybus: don't restrict input buffer size

Don't assume that input buffers have any particular content.  The
only thing the gbuf layer needs to be concerned with is the presence
of the cport_id byte at the beginning of a transfer.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: unlock hd mutex on free
Alex Elder [Thu, 16 Oct 2014 11:35:26 +0000 (06:35 -0500)]
greybus: unlock hd mutex on free

When free_hd() is called, hd_mutex is held.  It is the
responsibility of free_hd() to drop that mutex.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: unlock gbuf mutex on free
Alex Elder [Thu, 16 Oct 2014 11:35:25 +0000 (06:35 -0500)]
greybus: unlock gbuf mutex on free

To drop a reference on a gbuf, greybus_free_gbuf() is called.  That
uses kref_put_mutex() to drop the refernce under protection of
gbuf_mutex.  However the release routine, free_gbuf(), never
releases the mutex as it should.  Fix that.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: don't assume subdevs are valid
Alex Elder [Thu, 16 Oct 2014 11:35:24 +0000 (06:35 -0500)]
greybus: don't assume subdevs are valid

Most of the disconnect routines for the "subdevs" of a module
blindly assume that initialization of the subdev was successful.

Fix this by checking for null pointers.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: es1-ap-usb: handle -EPROTO in check_urb_status()
Matt Porter [Mon, 13 Oct 2014 07:00:53 +0000 (03:00 -0400)]
greybus: es1-ap-usb: handle -EPROTO in check_urb_status()

On a disconnect we can also have a status of -EPROTO. This results in
a flood of error messages due to the -EAGAIN handling of unsupported
status results. Fix this by also returning status when we have -EPROTO.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Changes required for integrating into the Android build
John Stultz [Fri, 10 Oct 2014 21:42:33 +0000 (14:42 -0700)]
greybus: Changes required for integrating into the Android build

In order to easily integrate into the Android build, include
an Android.mk.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: greybus_manifest.h: add BSD license so that firmware can share it.
Greg Kroah-Hartman [Tue, 7 Oct 2014 03:37:53 +0000 (20:37 -0700)]
greybus: greybus_manifest.h: add BSD license so that firmware can share it.

9 years agogreybus: svc_msg.h: add bsd license to file so that firmware can use it.
Greg Kroah-Hartman [Tue, 7 Oct 2014 03:37:18 +0000 (20:37 -0700)]
greybus: svc_msg.h: add bsd license to file so that firmware can use it.

9 years agogreybus: greybus_id.h: checkpatch cleanup
Greg Kroah-Hartman [Tue, 7 Oct 2014 03:37:08 +0000 (20:37 -0700)]
greybus: greybus_id.h: checkpatch cleanup

9 years agogreybus: greybus.h: remove transfer_flags
Greg Kroah-Hartman [Tue, 7 Oct 2014 03:34:48 +0000 (20:34 -0700)]
greybus: greybus.h: remove transfer_flags

We didn't use them, so drop it.

Also some other checkpatch cleanups while I was in there.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agogreybus: connection: properly lock idr
Greg Kroah-Hartman [Tue, 7 Oct 2014 03:29:40 +0000 (20:29 -0700)]
greybus: connection: properly lock idr

We had a lock, but we never used it, so move it to be per-hd, like the
idr structure is.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agogreybus: fix gb_manifest_parse() successful return path
Matt Porter [Mon, 6 Oct 2014 17:46:36 +0000 (13:46 -0400)]
greybus: fix gb_manifest_parse() successful return path

Even if we successfully parse a manifest we are returning
failure. Instead, we now proudly proclaim success.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: gb_hd_connection_find(): fix "not found" case
Marti Bolivar [Mon, 6 Oct 2014 17:26:02 +0000 (13:26 -0400)]
greybus: gb_hd_connection_find(): fix "not found" case

Without this, null-testing the return value of this function is
broken.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix manifest parsing problem with descriptor payload
Matt Porter [Mon, 6 Oct 2014 13:58:44 +0000 (09:58 -0400)]
greybus: fix manifest parsing problem with descriptor payload

The internal struct manifest_desc needs the data payload, rather
than the entire descriptor with header to be populated into the
data field. Also fix two places where the parser was trying to
extract the entire descriptor with header for the data payload
field.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: get rid of gbuf->hdpriv
Alex Elder [Mon, 6 Oct 2014 11:53:13 +0000 (06:53 -0500)]
greybus: get rid of gbuf->hdpriv

Last time I tried to kill off gbuf->context my efforts were shot
down.  Now that I've got the connection infrastructure in place,
maybe I'll have more luck getting rid of gbuf->hdpriv.

The only place it's used is to stash the es1_ap_dev structure
pointer in the buffer.  But that information is now available
through the buffer's connection, so we don't need to use the
hdpriv field any more.

So get rid of it, and use hd_to_es1(gbuf->connection->hd) to
get at what we need.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill __alloc_gbuf()
Alex Elder [Mon, 6 Oct 2014 11:53:12 +0000 (06:53 -0500)]
greybus: kill __alloc_gbuf()

GEt rid of __alloc_gbuf(), now that it's used in only one place.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: use alloc_gbuf_data() for both directions
Alex Elder [Mon, 6 Oct 2014 11:53:11 +0000 (06:53 -0500)]
greybus: use alloc_gbuf_data() for both directions

Change the "direction" flag field of a gbuf to be a Boolean called
"outbound".

Add a Boolean outbound flag to alloc_gbuf_data(), and use it for
allocating the data buffer for gbufs for data being transferred in
either direction.

Update free_gbuf_data() accordingly--letting the host device
driver's gbuf data free function handle all of them.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: allocate gbufs using the connection
Alex Elder [Mon, 6 Oct 2014 11:53:10 +0000 (06:53 -0500)]
greybus: allocate gbufs using the connection

Switch to using the connection rather than the host device as
the locus for doing Greybus buffer allocation.  A connection
encapsulates both the host device (whose driver is what's required
for allocation) and the *destination* cport id.  Record the
connection a gbuf is associated with rather than the host module and
(unspecified) cport id.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: look up connection for recevied messages
Alex Elder [Mon, 6 Oct 2014 11:53:09 +0000 (06:53 -0500)]
greybus: look up connection for recevied messages

Look up the connection that an incoming message is associated with.
This is the start of making message handling oriented toward the
the connection rather than the cport.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add bg_hd_connection_find()
Alex Elder [Mon, 6 Oct 2014 11:53:08 +0000 (06:53 -0500)]
greybus: add bg_hd_connection_find()

Add a function that looks up a connection given the host device
pointer an the host cport id.  This will be used to determine which
connection an incoming message is associated with.

Replace the list tracking host device connections with a red-black
tree so lookup can scale and be done quickly.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: bury some dead code
Alex Elder [Mon, 6 Oct 2014 11:53:07 +0000 (06:53 -0500)]
greybus: bury some dead code

One data structure and a few fields in another one are no longer
used, and were not removed when they should have been.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix two misnamed functions
Alex Elder [Mon, 6 Oct 2014 11:53:06 +0000 (06:53 -0500)]
greybus: fix two misnamed functions

I guess I got a little hd crazy.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: manifest.c: minor sparse cleanup
Greg Kroah-Hartman [Sun, 5 Oct 2014 01:43:41 +0000 (18:43 -0700)]
greybus: manifest.c: minor sparse cleanup

9 years agogreybus: define gb_connection_err()
Alex Elder [Fri, 3 Oct 2014 20:05:22 +0000 (15:05 -0500)]
greybus: define gb_connection_err()

Define a function that prints error information about a Greybus
connection in a standard format.  This adopts the convention that
[M:I:C] represents the "path" the connection represents--specifying
the module id, the interface number on that module, and the
connection id on that interface.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: add a connection->private field
Alex Elder [Fri, 3 Oct 2014 20:05:21 +0000 (15:05 -0500)]
greybus: add a connection->private field

This will be used for driver-specific data for whatever drives the
other end of the connection.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: specify type when creating an operation
Alex Elder [Fri, 3 Oct 2014 20:05:20 +0000 (15:05 -0500)]
greybus: specify type when creating an operation

The type of an operation belongs in the operation header, which
shouldn't be touched by users of the interface.  So specify it
at operation creation time.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: gbuf: have caller set actual_length
Alex Elder [Fri, 3 Oct 2014 20:05:19 +0000 (15:05 -0500)]
greybus: gbuf: have caller set actual_length

A Greybus buffer has both a transfer_buffer_size field, which is the
size in bytes of the transfer buffer, and an actual_length field,
which is the number of bytes in that buffer that are actually
consumed.  The user of the buffer--and not the buffer allocation
method--should be setting the actual_length field.

Stop setting the actual length on the es1-ap-usb alloc_gbuf_data
method.  And *do* set it in gb_operation_create(), where we can
presume the operation being allocated will consume all the bytes
requested.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix module setup
Alex Elder [Fri, 3 Oct 2014 19:14:25 +0000 (14:14 -0500)]
greybus: fix module setup

The code that was setting up a module was not properly initializing
the module data structure.  Fixing this required a little rework.

Now gb_add_module() (which the host device pointer and module id)
allocates and initializes the structure, and passes it to
gb_manifest_parse() for populating it further.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: use ida for cport id allocation
Alex Elder [Fri, 3 Oct 2014 19:14:24 +0000 (14:14 -0500)]
greybus: use ida for cport id allocation

The ida mechanism for allocating ids may be overkill but it works.

Don't preallocate the id 0 for control.  That should be done
when initializing connections based on the manifest anyway.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix greybus_class_type symbol names
Alex Elder [Fri, 3 Oct 2014 19:14:23 +0000 (14:14 -0500)]
greybus: fix greybus_class_type symbol names

These were inadvertently not fixed when the type name was changed.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix some hasty bugs
Alex Elder [Fri, 3 Oct 2014 19:14:22 +0000 (14:14 -0500)]
greybus: fix some hasty bugs

Fix some omissions found in the code.
    - initialize and use the host device connections list
    - rename the interface connections list (was "functions")
    - use the interface connections list
    - define a spinlock protecting the connections lists
    - declare gb_operation_submit() in "operation.h"

And the cport id map lock is per-host device, it's shared across all
host devices.  There's no need for one in struct greybus_host_device.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: implement core module removal path
Matt Porter [Fri, 3 Oct 2014 18:32:35 +0000 (14:32 -0400)]
greybus: implement core module removal path

Implement gb_remove_module() by finding the gb_module to
be removed via the supplied module_id. Add support for
removing the actual device into greybus_remove_device()
after all the subdevs are disconnected.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix gb_add_module() by enabling the device_add()
Matt Porter [Fri, 3 Oct 2014 17:38:24 +0000 (13:38 -0400)]
greybus: fix gb_add_module() by enabling the device_add()

Without the gb_module device being added, we have no parent
device for any of the greybus subdevs to be added. Do the
device_add() before creating subdevs as we need it then
to register any children in the various greybus protocol
drivers.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: manifest: some minor sparse warning fixups.
Greg Kroah-Hartman [Fri, 3 Oct 2014 04:26:26 +0000 (21:26 -0700)]
greybus: manifest: some minor sparse warning fixups.

9 years agogreybus: operation: fix endian issue in the operation message header size field.
Greg Kroah-Hartman [Fri, 3 Oct 2014 04:25:21 +0000 (21:25 -0700)]
greybus: operation: fix endian issue in the operation message header size field.

9 years agogreybus: record connection protocol
Alex Elder [Thu, 2 Oct 2014 17:30:06 +0000 (12:30 -0500)]
greybus: record connection protocol

Record the protocol association with a connection when it gets
created.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: get rid of functions now...
Alex Elder [Thu, 2 Oct 2014 17:30:05 +0000 (12:30 -0500)]
greybus: get rid of functions now...

We decided yesterday that we would no longer support the notion of a
"function."  Instead, a connection will simply exist between the AP
and an interface on a module (and a CPort Id on each end).  What
was previously considered the "function type" will now be handled
as the "protocol" associated with the connection.

Update gb_connection_create() to take just the interface and a cport
id associated with that interface.

Right now every module points back to a host device, so for now
we'll establish the connection back to that.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: allocate connection host cport id
Alex Elder [Thu, 2 Oct 2014 17:30:04 +0000 (12:30 -0500)]
greybus: allocate connection host cport id

Allocate a cport id from the host device whenever creating a
connection.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: create host device cport id map
Alex Elder [Thu, 2 Oct 2014 17:30:03 +0000 (12:30 -0500)]
greybus: create host device cport id map

A Greybus host device has a pool of CPort Ids it can use.  When we
establish a connection with a CPort on another module we will need
to allocate one from those that are available.

This patch adds a bitmap to the greybus host device structure that
allows cport ids to be allocated and freed as needed.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: October 1 updates
Alex Elder [Thu, 2 Oct 2014 17:30:02 +0000 (12:30 -0500)]
greybus: October 1 updates

Update the definitions in "greybus_manifest.h" to reflect the
changes to the Greybus specification made on October 1.

They are:
    - renaming "device" to be "interface"
    - renumbering greybus descriptor type
    - eliminating the notion of a "function"
    - defining a CPort's protocol in the CPort descriptor
    - having a "class" take on the types previously used for "function"
    - renaming "serial number" to be "unique id" (for now)
    - relying on an interface's maximum cport id to determine how
      much device+cport address space the interface consumes
    - adding a simple class descriptor
    - renaming gb_interface->interface_id to be gb_interface->id

This also reorders some things to match ordering in the document,
and adds some commentary for the various structures.

Since greybus_function_type is gone, we eliminate the "type" field
from a function structure.  (Functions are going away, next.)

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix connection header declarations
Alex Elder [Thu, 2 Oct 2014 17:30:01 +0000 (12:30 -0500)]
greybus: fix connection header declarations

Changes to the create/destroy connection functions were not properly
reflected in the header file.  Fix that.  There's also no need to
include anything other than "greybus.h".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill off old manifest code
Alex Elder [Thu, 2 Oct 2014 02:54:19 +0000 (21:54 -0500)]
greybus: kill off old manifest code

Now that the new manifest code is in place, delete the old stuff
from "core.c".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: manifest cport descriptor parsing
Alex Elder [Thu, 2 Oct 2014 02:54:18 +0000 (21:54 -0500)]
greybus: manifest cport descriptor parsing

Add support for parsing one or more cports descriptors in a module
manifest.  There must be at least one for each interface, but we impose
no limit on the number of interfaces associated with a module.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: manifest interface descriptor parsing
Alex Elder [Thu, 2 Oct 2014 02:54:17 +0000 (21:54 -0500)]
greybus: manifest interface descriptor parsing

Add support for parsing one or more interface descriptors in a module
manifest.  There must be at least one, but we impose no limit on the
number of interfaces associated with a module.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: start improving manifest parsing
Alex Elder [Thu, 2 Oct 2014 02:54:16 +0000 (21:54 -0500)]
greybus: start improving manifest parsing

Currently the module manifest parsing code is sort of representative
only and is not really very useful.

This patch begins doing "real" parsing of the module manifest.
It scans the module manifest to identify the descriptors it holds.
It then verifies there's only one module descriptor found, and
initializes new some fields in the gb_module structure based on what
it contains (converting what's found to native byte order).
Note that if anything unexpected is found or other errors occur when
parsing the manifest, the parse fails.

Because we now save this converted information when it's parsed we
no longer have a greybus_descriptor_module struct within a struct
gb_module.  And because we've already converted these values, we can
do a little less work displaying values in sysfs.  (We also now show
vendor, product, and version values in the right byte order.)  This
eliminates the need for greybus_string(), so get rid of it.

It also slightly simplifies the greybus module matching code.

Move some existing parsing code into a new file, "manifest.c".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: introduce an operation abstraction
Alex Elder [Thu, 2 Oct 2014 02:54:15 +0000 (21:54 -0500)]
greybus: introduce an operation abstraction

This patch defines a new "operation" abstraction.  An operation is a
request from by one end of a connection to the function (or AP) on
the other, coupled with a matching response returned to the requestor.
The request indicates some action to be performed by the target of
the request (such as "read some data").  Once the action has
completed the target sends back an operation response message.
Additional data can be supplied by the sender with its request,
and/or by the target with its resposne message.

Each request message has a unique id, generated by the sender.
The sender recognizes the matching response by the presence
of this id value.  Each end of a connection is responsible
for creating unique ids for the requests it sends.

An operation also has a type, whose interpretation is dependent on
the function type on the end of the connection opposite the sender.
It is up to the creator of an operation to fill in the data (if any)
to be sent with the request.

Note that not all requests are initiated by the AP.  Incoming data
on a module function can result in a request message being sent from
that function to the AP to notify of the data's arrival.  Once the
AP has processed this, it sends a response to the sender.

Every operation response contains a status byte.  If it's value
is 0, the operation was successful.  Any other value indicates
an error.

Add a defintion of U16_MAX to "kernel_ver.h".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: introduce a connection abstraction
Alex Elder [Thu, 2 Oct 2014 02:54:14 +0000 (21:54 -0500)]
greybus: introduce a connection abstraction

Within a UniPro network a pair of CPorts can be linked to form a
UniPro Connection.  This patch creates a new abstraction to
represent an AP CPort that is connected with a CPort used by a
function within a Greybus module.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: define greybus function abstraction
Alex Elder [Thu, 2 Oct 2014 02:54:13 +0000 (21:54 -0500)]
greybus: define greybus function abstraction

Define new source files "function.h" and "function.c" to contain the
definitions of the Greybus function abstraction.  A Greybus function
represents an active entity connected to a CPort implemented by a
Greybus interface.  A Greybus function has a type, which defines the
protocol to be used to interact with the function.  A Greybus
interface normally has at least two functions, but potentially many
more.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: define greybus interface abstraction
Alex Elder [Thu, 2 Oct 2014 02:54:12 +0000 (21:54 -0500)]
greybus: define greybus interface abstraction

Define new source files "interface.h" and "interface.c" to contain
the definitions of the Greybus interface abstraction.  A Greybus
interface represents a UniPro device present in a UniPro module.
For Project Ara, each interface block on a module implements a
UniPro interface.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: isolate greybus module code
Alex Elder [Thu, 2 Oct 2014 02:54:11 +0000 (21:54 -0500)]
greybus: isolate greybus module code

Define new source files "module.h" and "module.c" to separate the
definitions of the Greybus module abstraction from other code.

Rename "greybus_module" to be "gb_module", for brevity.  Do the same
for a few other symbols with "greybus_module" in their names.  A few
(like greybus_module_id) are more visible outside this kernel module
so we'll keep their names more descriptive.

Add a definition for U8_MAX in "kernel_ver.h" (it appeared in 3.14).

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>