platform/kernel/linux-starfive.git
9 years agogreybus: distinguish incoming from outgoing requests
Alex Elder [Wed, 19 Nov 2014 23:55:02 +0000 (17:55 -0600)]
greybus: distinguish incoming from outgoing requests

When we remove the mandatory status byte from response messages we
will no longer be able to use a zero-sized response to indicate
an operation is to be used for an incoming request.

Define a new function gb_operation_create_incoming() to be used
for incoming operations.  Change (and rename) gb_operation_create()
to be a helper that takes a Boolean to indicate which type is to be
created, and use a simple wrapper to expose the outgoing operation
creation routine.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: get rid of uart request_operation()
Alex Elder [Wed, 19 Nov 2014 23:55:01 +0000 (17:55 -0600)]
greybus: get rid of uart request_operation()

In "uart-gb.c", request_operation() function is only used by
get_version().  Since it's not reused, it probably subtracts
rather than adds value.  So just incorporate what it does
into get_version() and get rid of request_operation().

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: uart-gb: handle throttle/unthrottle properly
Greg Kroah-Hartman [Wed, 19 Nov 2014 22:23:00 +0000 (14:23 -0800)]
greybus: uart-gb: handle throttle/unthrottle properly

This hooks up throttle/unthrottle to properly toggle the RTS line or do
XON/XOFF if that is how the port is set up.

Note, if the UART itself can handle XON/XOFF, we would need to send the
correct character down to it, to have the firmware in the device set up
the chip to use it automatically when needed.  The odds of someone
wanting to use this type of flow control is slim, so this isn't
implemented at this point in time.

Also fill in a few more fields in the get_serial_info ioctl, to make
tools like stty(1) happier.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix vibrator request_operation()
Alex Elder [Wed, 19 Nov 2014 23:05:14 +0000 (17:05 -0600)]
greybus: fix vibrator request_operation()

And this fixes a problem similar the last two, this time found in
the vibrator protcool driver code.

Change a variable name in get_version() to reflect that it holds
a response message, not a request message.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix uart request_operation()
Alex Elder [Wed, 19 Nov 2014 22:29:15 +0000 (16:29 -0600)]
greybus: fix uart request_operation()

This fixes a problem similar to what was found in the battery
protcool driver code.

There's no need to allocate a local buffer, that already set up
by gb_operation_create().  Just use that instead.

Change a few variable names to reflect that they hold response
messages, not request messages.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix battery_operation()
Alex Elder [Wed, 19 Nov 2014 22:29:14 +0000 (16:29 -0600)]
greybus: fix battery_operation()

This patch fixes some problems with the battery protocol driver.

First, when gb_operation_create() is called, it creates buffers of
the requested sizes to hold the operation request and response
messages.  There is therefore no reason to allocate a local response
buffer.  By the time the (synchronous) gb_operation_request_send()
call returns, the operation response buffer will have been filled in.

(In addition, the content of local_response was not being filled
before its contents were used...)

Next, all the message structures are misnamed.  The structures that
are defined are all the content of operation response messages (not
request messages).  So this changes all the types names to properly
reflect their role.

All the local variables using these types are similarly renamed.

I added a new type, gb_generic_battery_response, to be used for
casting the fake_response used in battery_operation().

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: operation: don't complete operation twice
Viresh Kumar [Wed, 19 Nov 2014 11:55:00 +0000 (17:25 +0530)]
greybus: operation: don't complete operation twice

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: refactor gb_connection_recv()
Alex Elder [Wed, 19 Nov 2014 18:27:17 +0000 (12:27 -0600)]
greybus: refactor gb_connection_recv()

Define two helper functions to break down handling of a received
message.  One is used to handle receiving an incoming request
message, the other for a response message.

Three other changes are made:
    - We verify message size recorded in the message header does not
      exceed the amount of data that's arriving.
    - We no longer warn if a request' recorded message size differs
      from the number of bytes that have arrived.
    - We now record the operation id for an incoming request.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: use "operation_id" for certain values
Alex Elder [Wed, 19 Nov 2014 18:27:16 +0000 (12:27 -0600)]
greybus: use "operation_id" for certain values

A message header contains a field "id" that is an operation id.
Since the field doesn't identify the message itself, rename this
field so it's clearer what it's referring to.

Similarly gb_pending_operation_find() has a parameter "id" that
is really an operation id, so rename that as well.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: get rid of message status
Alex Elder [Wed, 19 Nov 2014 18:27:15 +0000 (12:27 -0600)]
greybus: get rid of message status

We (sort of) maintain the status of each message, but we shouldn't
need to.  Right now we're not using it consistently in any case.

If a message fails to send, the caller will know to destroy the
operation that contained it.

If a message has been sent (i.e., handed to the host device layer)
it'll have a non-null cookie pointer.

If a does complete in error, we can update the status of the
operation that contains it.  That isn't happening right now but
it will soon.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: tidy up svc_in_callback() and cport_in_callback()
Alex Elder [Wed, 19 Nov 2014 18:27:14 +0000 (12:27 -0600)]
greybus: tidy up svc_in_callback() and cport_in_callback()

The only use of local variable "es1" in in svc_in_callback() and
cport_in_callback() is to get at its hd field.  But we already have
that, so we can get rid of that local variable.

Also, rename the "cport" variable "cport_id" in cport_in_callback()
is to match the convention used elsewhere, and make it the proper
u16 type.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: explicitly mark cookies as opaque
Alex Elder [Wed, 19 Nov 2014 18:27:13 +0000 (12:27 -0600)]
greybus: explicitly mark cookies as opaque

Use simple macros to mark the conversion of an URB pointer into an
opaque cookie value (and vice-versa).  We scramble some bits, but
the main point is to make it explicit where we're returning and
using opaque values.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: ap: function_id is already set by svc_msg_alloc()
Viresh Kumar [Wed, 19 Nov 2014 11:54:59 +0000 (17:24 +0530)]
greybus: ap: function_id is already set by svc_msg_alloc()

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Pass '*ptr' to sizeof() wherever possible
Viresh Kumar [Wed, 19 Nov 2014 11:54:58 +0000 (17:24 +0530)]
greybus: Pass '*ptr' to sizeof() wherever possible

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: ap: keep all svc function routines together
Viresh Kumar [Wed, 19 Nov 2014 11:54:57 +0000 (17:24 +0530)]
greybus: ap: keep all svc function routines together

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: ap: remove extra parameter to convert_ap_message()
Viresh Kumar [Wed, 19 Nov 2014 11:54:56 +0000 (17:24 +0530)]
greybus: ap: remove extra parameter to convert_ap_message()

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: vibrator-gb.c: fix up incorrect comment
Greg Kroah-Hartman [Wed, 19 Nov 2014 18:36:23 +0000 (10:36 -0800)]
greybus: vibrator-gb.c: fix up incorrect comment

s/i2c/vibrator/

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Merge branch 'master' into vibrator-gb
Greg Kroah-Hartman [Tue, 18 Nov 2014 20:54:35 +0000 (12:54 -0800)]
greybus: Merge branch 'master' into vibrator-gb

9 years agogreybus: pass gfp_flags for message allocation
Alex Elder [Tue, 18 Nov 2014 19:26:54 +0000 (13:26 -0600)]
greybus: pass gfp_flags for message allocation

The only reason gb_operation_message_init() gets its "outbound"
argument is so we can determine what allocation flags to use.
Just pass the flags in directly instead.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: stop storing dest_cport_id in message
Alex Elder [Tue, 18 Nov 2014 19:26:53 +0000 (13:26 -0600)]
greybus: stop storing dest_cport_id in message

We can derive the destination CPort id of any (outbound) message
from the connection it's operation is associated with.  So we don't
need to store that information in every message.

As a result, we no longer need to record it at message initialization
time.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: stop storing hd in message
Alex Elder [Tue, 18 Nov 2014 19:26:52 +0000 (13:26 -0600)]
greybus: stop storing hd in message

The host device pointer doesn't have to be stored in every message.
It can be derived by following up the chain of pointers back to
the operation's connection.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill the last gbuf remnants
Alex Elder [Tue, 18 Nov 2014 19:26:51 +0000 (13:26 -0600)]
greybus: kill the last gbuf remnants

All the code has now been adjusted such that we can do away with the
old gbuf structure.

Three unused references remained in "greybus.h", so those are deleted.

Other than that most of the changes were done by simple global
substitution.  The gb_message structure incorporates the fields that
were previously found its embedded gbuf structure.  A few names have
been changed in the process:
    gbuf->transfer_buffer       message->buffer
    gbuf->transfer_buffer_size  message->buffer_size
    gbuf->hcd_data;             message->cookie

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: rework receve handling
Alex Elder [Tue, 18 Nov 2014 19:26:50 +0000 (13:26 -0600)]
greybus: rework receve handling

Rework gb_connection_operation_recv() to be more oriented toward an
operation message, and to no longer use a struct gbuf local variable.
Rename it to be a little more wieldy.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: cancel messages, not gbufs
Alex Elder [Tue, 18 Nov 2014 19:26:49 +0000 (13:26 -0600)]
greybus: cancel messages, not gbufs

Rework greybus_kill_gbuf() to be oriented toward an operation
message rather than a gbuf, and rename it.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: send messages, not gbufs
Alex Elder [Tue, 18 Nov 2014 19:26:48 +0000 (13:26 -0600)]
greybus: send messages, not gbufs

Rework greybus_submit_gbuf() to be oriented toward an operation
message rather than a gbuf, and rename it accordingly.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: rework message initialization
Alex Elder [Tue, 18 Nov 2014 19:26:47 +0000 (13:26 -0600)]
greybus: rework message initialization

Rework gb_opreation_message_init() so it doesn't use a struct gbuf
local variable.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: send buffers without gbufs
Alex Elder [Tue, 18 Nov 2014 19:26:46 +0000 (13:26 -0600)]
greybus: send buffers without gbufs

Change the method that sends messages so that it sends "raw" buffers
rather than gbufs.  To do this, we supply the host device and
destination CPort when sending.  As with other recent patches,
change the name of the method to reflect that we're no longer
dealing with gbufs.

The interface has changed as well.  Now this routine will return a
"cookie" value.  The cookie is used to represent the outgoing
request, and is supplied by the caller if necessary to cancel a
previously-sent buffer.  We'll store the result in gbuf->hcd_data
for now (which produces the same result as before...).

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: stash hd as context for all URBs
Alex Elder [Tue, 18 Nov 2014 19:26:45 +0000 (13:26 -0600)]
greybus: stash hd as context for all URBs

This changes the context value stashed with each USB URB so that it
is always the host device pointer.

In cport_out_callback() this allows us to get away with *not*
requiring the gbuf for handling completions any more.  We are
(currently) ignoring the gbuf status value returned anyway, so
we'll skip setting it altogether.

Greg's comments in cport_out_callback() point out that ignoring
this was misguided, and handling send errors will be put in
place in an upcoming patch.

The context is set to the host device pointer for SVC receive and
CPort receive URBs for consistency--because we can.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: cancel buffers via magic cookie
Alex Elder [Tue, 18 Nov 2014 19:26:44 +0000 (13:26 -0600)]
greybus: cancel buffers via magic cookie

Change the interface for canceling in-flight buffers to take a magic
cookie value as argument rather than a gbuf.  Right now we pass the
gbuf->hcd_data pointer that's assumed to have been set by the submit
routine.  But the next patch will change the submit routine to
return the cookie to be used, and the caller will be responsible for
keeping track of it.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: free space without gbufs
Alex Elder [Tue, 18 Nov 2014 19:26:43 +0000 (13:26 -0600)]
greybus: free space without gbufs

Switch the host driver free routine to take a pointer to the
previously-allocated buffer that should be freed.

Rename the method to reflect it's no longer tied to a gbuf.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: allocate space without gbufs
Alex Elder [Tue, 18 Nov 2014 19:26:42 +0000 (13:26 -0600)]
greybus: allocate space without gbufs

This begins the transition to buffer allocation that does not rely
on the gbuf construct.

The host driver allocation routine will return a pointer to the
buffer to be used, and the caller will be responsible for keeping
track of that pointer, as well as the requested buffer size.

Rename the allocation method to reflect it's no longer tied to a
gbuf.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fill in destination data at send time
Alex Elder [Tue, 18 Nov 2014 19:26:41 +0000 (13:26 -0600)]
greybus: fill in destination data at send time

For ES1 we need to insert the destination CPort id before the data
to be sent over UniPro.  Currently this is done at the time the
buffer is created, but there's no need to do so until we're actually
going to send the content of the buffer.

Move the setting of that destination information into submit_gbuf().
Note that this allows us to defer initializing a few other gbuf
fields until after we know the buffer allocation has succeeded.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: improve data buffer alignment
Alex Elder [Tue, 18 Nov 2014 19:26:40 +0000 (13:26 -0600)]
greybus: improve data buffer alignment

For ES1 we need to insert the destination CPort id in whatever we
supply for sending over UniPro.  Currently we allocate one extra
byte supply the caller with an address that's offset by one from
the beginning of the allocated space.

As a result we always return a poorly-aligned buffer pointer.

Instead, allocate enough space so that we can return a better
aligned buffer to the caller.

Notes:
    - It may be that it's more important to supply an aligned
      address to the hardware.
    - We probably need to be more careful about writing into
      these buffers at unaligned offsets anyway.  (E.g., writing
      a 2-byte value at an odd offset can't be assumed to work.)

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: prepend cport byte for all gbufs
Alex Elder [Tue, 18 Nov 2014 19:26:39 +0000 (13:26 -0600)]
greybus: prepend cport byte for all gbufs

Treat communication buffers for both inbound and outbound data the
same way, prepending a "destination cport id" byte before the data
in the buffer.  Currently this is done only for outbound data
buffers.

This isn't needed for inbound data, but handling it this way
allows the free routine to work without knowing whether the
buffer was used for sending or receiving.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: fix an allocation flag bug
Alex Elder [Tue, 18 Nov 2014 19:26:38 +0000 (13:26 -0600)]
greybus: fix an allocation flag bug

We allocate message buffers with GFP_KERNEL allocation flags if
possible.  However when an incoming request message is received we
can be in interrupt context, so we must use GFP_ATOMIC in that case.

The computation of gfp_flags in gb_operation_message_init() is
wrong.  It is needlessly using GFP_ATOMIC when allocating outbound
response buffers.  Fix the flawed logic.

Change the name of "data_out" to be "outbound" to be consistent with
usage elsewhere.  (Data/messages are "inbound" or "outbound";
requests are "incoming" or "outgoing".)

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: vibrator-gb: fix up api changes
Greg Kroah-Hartman [Tue, 18 Nov 2014 20:21:27 +0000 (12:21 -0800)]
greybus: vibrator-gb: fix up api changes

responses changed in 'master' so fix up things so that the vibrator
driver works properly.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Merge branch 'master' into vibrator-gb
Greg Kroah-Hartman [Tue, 18 Nov 2014 20:18:35 +0000 (12:18 -0800)]
greybus: Merge branch 'master' into vibrator-gb

9 years agogreybus: kill off the last of gbuf.c
Alex Elder [Tue, 18 Nov 2014 00:08:37 +0000 (18:08 -0600)]
greybus: kill off the last of gbuf.c

Only three functions remain in "gbuf.c".  Move one of them into
"connection.c" and the other two into "operation.c".

Some more cleanup is coming that will further straighten out gbufs
but for now there's no sense in drawing this out any longer.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill the gbuf slab cache
Alex Elder [Tue, 18 Nov 2014 00:08:36 +0000 (18:08 -0600)]
greybus: kill the gbuf slab cache

Nobody dynamically allocates gbufs any more, so we can get rid of
the allocation and free routines, as as the slab cache and its
related code.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: embed gbufs into operation message structure
Alex Elder [Tue, 18 Nov 2014 00:08:35 +0000 (18:08 -0600)]
greybus: embed gbufs into operation message structure

Embed the gbuf structures for operation messages into the message
structure rather than pointing to a dynamically allocated one.

Use a null gbuf->transfer_buffer pointer rather than a null gbuf
pointer to indicate an unused gbuf.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: use null gbuf->transfer_buffer
Alex Elder [Tue, 18 Nov 2014 00:08:34 +0000 (18:08 -0600)]
greybus: use null gbuf->transfer_buffer

Make sure gbuf->transfer_buffer gets reset to NULL when the buffer
is freed.  We can leverage that to do a little extra error checking.
We'll also use a null transfer buffer in the next patch to indicate
an unused gbuf.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: move gbuf initialization to caller
Alex Elder [Tue, 18 Nov 2014 00:08:33 +0000 (18:08 -0600)]
greybus: move gbuf initialization to caller

Change greybus_alloc_gbuf() so all it does is allocate the gbuf data
structure.  Move all of the initialization of the gbuf structure in
the caller.  Do the inverse in the caller prior to freeing the gbuf
structure via greybus_free_gbuf().  Use a null gbuf->transfer_buffer
pointer rather than a null gbuf pointer to indicate an unused gbuf.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: start using struct gb_message
Alex Elder [Tue, 18 Nov 2014 00:08:32 +0000 (18:08 -0600)]
greybus: start using struct gb_message

This converts some of the operation code to start leveraging the
new gb_message type.  Instead of creating the request and response
gbufs, we initialize (and tear down with a new function) the
request and response message structures.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: define struct gb_message
Alex Elder [Tue, 18 Nov 2014 00:08:31 +0000 (18:08 -0600)]
greybus: define struct gb_message

A Greybus buffer (gbuf) is a generic buffer used for data transfer
over a Greybus interconnect.  We only ever use gbufs in operations,
which always involve exactly two of them.  The lifetime of a gbuf is
therefore directly connected to the lifetime of an operation, so
there no real need to manage gbufs separate from operations.

This patch begins the process of removing the gbuf abstraction, on
favor of a new data type, gb_message.  The purpose of a gb_message
is--like a gbuf--to represent data to be transferred over Greybus.
However a gb_message is oriented toward the more restrictive way
we do Greybus transfers--as operation messages (either a request or
a response).

This patch simply defines the structure in its initial form, and
defines the request and response fields in a Greybus operation
structure as embedded instances of that type.  The gbuf pointer
is defined within the gb_message structure, and as a result lots
of code needs to be tweaked to reference the request and response
gbufs as subfields of the request and response structures.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: move the definition of struct gbuf
Alex Elder [Tue, 18 Nov 2014 00:08:30 +0000 (18:08 -0600)]
greybus: move the definition of struct gbuf

We no longer need struct gbuf defined in "greybus.h".  An upcoming
patch will embed a gbuf struct (not a pointer) into the operation
structure, and to do that we'll need the struct defined prior to the
operation.  Just move the gbuf definition into "operation.h".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill gbuf->kref
Alex Elder [Tue, 18 Nov 2014 00:08:29 +0000 (18:08 -0600)]
greybus: kill gbuf->kref

Since there is only ever one reference to a gbuf, we don't need a
kref to figure out when it can be freed.  Get rid of the kref and
its supporting code.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill greybus_{get,put}_gbuf()
Alex Elder [Tue, 18 Nov 2014 00:08:28 +0000 (18:08 -0600)]
greybus: kill greybus_{get,put}_gbuf()

These functions are never used, so we can get rid of them.
Since there's no reference-getting function any more, we no
longer need "gbuf_mutex" to avoid racing gets and puts, so
get rid of that too.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: vibrator-gb: proper allocate minor numbers
Greg Kroah-Hartman [Tue, 18 Nov 2014 01:12:50 +0000 (17:12 -0800)]
greybus: vibrator-gb: proper allocate minor numbers

Change the driver to allocate minors in a proper manner, using the idr
interface.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: vibrator-gb: fixes based on Marti's review comments.
Greg Kroah-Hartman [Tue, 18 Nov 2014 00:55:54 +0000 (16:55 -0800)]
greybus: vibrator-gb: fixes based on Marti's review comments.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: vibrator-gb: add vibrator driver
Greg Kroah-Hartman [Tue, 18 Nov 2014 00:03:34 +0000 (16:03 -0800)]
greybus: vibrator-gb: add vibrator driver

This driver implements the Greybus vibrator protocol, as defined in the
Greybus protocol specification.  It interacts to userspace with a single
sysfs file, "timeout", and a separate "class" called "vibrator".  That
interface can/should be changed in the future depending on what Android
wants for its HAL, but for now should be good enough to test with.

There are some changes needed to kernel_ver.h to support some
sysfs/driver core changes that happened after the 3.10 kernel was
released to try to make the code simpler.  Even with those changes,
there are #ifdefs in the code to do different things depending on the
kernel version to implement the same userspace api.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: greybus_manifest.h: update with full list of protocols
Greg Kroah-Hartman [Mon, 17 Nov 2014 23:19:14 +0000 (15:19 -0800)]
greybus: greybus_manifest.h: update with full list of protocols

The protocol values had gotten out of sync with the Greybus Protocol
specification document, so bring them back into sync by changing a few
values, and adding the missing values.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: uart: handle NULL size requests in request_operation()
Greg Kroah-Hartman [Mon, 17 Nov 2014 23:15:34 +0000 (15:15 -0800)]
greybus: uart: handle NULL size requests in request_operation()

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: get rid of cport_id_map_lock
Alex Elder [Mon, 17 Nov 2014 14:08:45 +0000 (08:08 -0600)]
greybus: get rid of cport_id_map_lock

The only time we get a cport id is when setting up a new connection.
We already have a (coarser-grained) spin lock that's used to protect
the connection lists, and we can use that same lock for protecting
the hd's connection id map.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: use a simple list of hd connections
Alex Elder [Mon, 17 Nov 2014 14:08:44 +0000 (08:08 -0600)]
greybus: use a simple list of hd connections

First of all, there's a bug in _gb_hd_connection_insert, which
Viresh found.  But pointing out that problem just called attention
to the fact that I have planning to to remove the affected block of
code.

The set of connections associated with a host device is currently
maintained in a red-black tree.  The number of connections we're
likely to have is on the order of a hundred, and at least for now
isn't even going to approach that.  When this code first went in,
Greg asserted that using a list is speedier than a red-black tree
for smallish numbers of elements (maybe up to a few hundred?).

So this patch just removes the host device's red-black tree of
connections, using a simple list instead.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: record the host device in a gbuf
Alex Elder [Mon, 17 Nov 2014 14:08:43 +0000 (08:08 -0600)]
greybus: record the host device in a gbuf

The only thing we now use the gbuf->operation pointer for is
to get access to its connection's host device.

Record the host device pointer directly in the gbuf, rather
than keeping a pointer to the operation.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: use gbuf's destination cport id
Alex Elder [Mon, 17 Nov 2014 14:08:42 +0000 (08:08 -0600)]
greybus: use gbuf's destination cport id

If the buffer allocated in the ES1 alloc_gbuf_data() routine is for
outbound data, we are getting the destination CPort id from the
connection.  Switch to using the copy of the destination cport id
we now have in the gbuf instead.

Check for a valid CPort id there only if we're inserting it into
the buffer.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: record a gbuf's destination CPort id
Alex Elder [Mon, 17 Nov 2014 14:08:41 +0000 (08:08 -0600)]
greybus: record a gbuf's destination CPort id

Rather than indicating whether a gbuf is intended for outbound data,
record its destination CPort id.  That's what's really needed by
the ES1 host driver.  Use CPORT_ID_BAD when the buffer is intended
for inbound data.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: reference count operations
Alex Elder [Mon, 17 Nov 2014 14:08:40 +0000 (08:08 -0600)]
greybus: reference count operations

Add a reference counter to the operations structure.  We'll
need this when operations are actually allowed to complete
asynchronously.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: clean up gb_connection_operation_recv()
Alex Elder [Mon, 17 Nov 2014 14:08:39 +0000 (08:08 -0600)]
greybus: clean up gb_connection_operation_recv()

This patch does some cleanup of gb_connection_operation_recv().
    - Improve the header comments
    - Verify message is big enough for header before interpreting
      beginning of the message as a header
    - Verify at buffer creation time rather than receive time that
      no operation buffer is bigger than the maximum allowed.  We
      can then compare the incoming data size against the buffer.
    - When a response message arrives, record its status in the
      operation result, not in the buffer status.
    - Record a buffer overflow as an operation error.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: kill gb_operation_gbuf_complete()
Alex Elder [Mon, 17 Nov 2014 14:08:38 +0000 (08:08 -0600)]
greybus: kill gb_operation_gbuf_complete()

It's possible this function was destined to do something important,
but at this point it's pretty pointless.  Get rid of it.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: delete some lines in "greybus.h"
Alex Elder [Mon, 17 Nov 2014 14:08:37 +0000 (08:08 -0600)]
greybus: delete some lines in "greybus.h"

This gets rid of a block of unnecessary forward declarations in
"greybus.h".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: move operation timeout teardown
Alex Elder [Mon, 17 Nov 2014 14:08:36 +0000 (08:08 -0600)]
greybus: move operation timeout teardown

Move the cancel_delayed_work() call so it's done separate from the
removing the operation from the pending list.

This should have been part of this commit:
    d3809f7 greybus: move timeout out of gb_operation_insert()

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: Greybus UART connection driver
Greg Kroah-Hartman [Sun, 16 Nov 2014 02:30:00 +0000 (18:30 -0800)]
greybus: Greybus UART connection driver

Flush out the Greybus UART driver to actually implement greybus
requests.  The number of Greybus Protocol operations has been reduced
down to a managable number, and, if you look closely, you will notice it
follows the CDC ACM USB specification, which can drive UART devices
quite well, no need for complex UART state changes, leave all of that
logic up to the firmware, if it wants/needs it.

The Greybus Protocol spec has been updated to match the driver.

TODO: There are 2 requests from the device to the host that need to be
implemented.  As this isn't fully hooked up in the Greybus core, that is
not implemented here yet either.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
9 years agogreybus: skeleton for future uevents.
Greg Kroah-Hartman [Sat, 15 Nov 2014 20:12:16 +0000 (12:12 -0800)]
greybus: skeleton for future uevents.

Implement a skeleton for the uevent framework, to be filled in later
when we figure out what type of module "matching" we want to do for
things (connections, interfaces, modules, etc.)

Based on a patch from Viresh Kumar <viresh.kumar@linaro.org>

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: Revert "manifest: remove extra loop for finding module descriptor"
Greg Kroah-Hartman [Fri, 14 Nov 2014 22:37:56 +0000 (14:37 -0800)]
greybus: Revert "manifest: remove extra loop for finding module descriptor"

This reverts commit 4d1529e6687d53878b71cdcd646e28e10d62c2e8.

Alex reports that this causes problems.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: Revert "manifest: improve print message"
Greg Kroah-Hartman [Fri, 14 Nov 2014 22:37:32 +0000 (14:37 -0800)]
greybus: Revert "manifest: improve print message"

This reverts commit b8ba855506906de71df5b12b50cdbbf7259a930c.

needed to revert an older change.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: interface: move gb_module_interface_init() to interface.c
Viresh Kumar [Fri, 14 Nov 2014 11:55:08 +0000 (17:25 +0530)]
greybus: interface: move gb_module_interface_init() to interface.c

That's where it belong to. Also rename it in a similar way to:
gb_interface_create() and gb_interface_destroy().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: module: move module specific code to module.c
Viresh Kumar [Fri, 14 Nov 2014 11:55:07 +0000 (17:25 +0530)]
greybus: module: move module specific code to module.c

Some of module specific routines were present in core.c instead of module.c.
Move them to the right place.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: module: move gb_module_find() to a more logical location
Viresh Kumar [Fri, 14 Nov 2014 11:55:06 +0000 (17:25 +0530)]
greybus: module: move gb_module_find() to a more logical location

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: core: re-use gb_module_find() in gb_remove_module()
Viresh Kumar [Fri, 14 Nov 2014 11:55:05 +0000 (17:25 +0530)]
greybus: core: re-use gb_module_find() in gb_remove_module()

Also fix print message.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: connection: fix duplicating naming in _gb_hd_connection_insert()
Viresh Kumar [Fri, 14 Nov 2014 11:55:04 +0000 (17:25 +0530)]
greybus: connection: fix duplicating naming in _gb_hd_connection_insert()

Though this doesn't cause any logical issues as far as the behavior of the
routine is concerned as the local variable would be considered inside the
'while' loop.

But its better not to use the same name for variables at different levels.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: manifest: make sure manifest_descs list is empty before parsing manifest
Viresh Kumar [Fri, 14 Nov 2014 11:55:03 +0000 (17:25 +0530)]
greybus: manifest: make sure manifest_descs list is empty before parsing manifest

Just an extra check to make sure the list isn't corrupted.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: connection: try cancelling operations only if list isn't empty
Viresh Kumar [Fri, 14 Nov 2014 11:55:02 +0000 (17:25 +0530)]
greybus: connection: try cancelling operations only if list isn't empty

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: nullify dangling pointers
Viresh Kumar [Fri, 14 Nov 2014 11:55:01 +0000 (17:25 +0530)]
greybus: nullify dangling pointers

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: operation: free resources in the reverse order of allocation
Viresh Kumar [Fri, 14 Nov 2014 11:55:00 +0000 (17:25 +0530)]
greybus: operation: free resources in the reverse order of allocation

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: core: use 'drv' instead of dev->driver
Viresh Kumar [Fri, 14 Nov 2014 11:54:59 +0000 (17:24 +0530)]
greybus: core: use 'drv' instead of dev->driver

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: core: remove unnecessary braces
Viresh Kumar [Fri, 14 Nov 2014 11:54:58 +0000 (17:24 +0530)]
greybus: core: remove unnecessary braces

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: manifest: improve print message
Viresh Kumar [Fri, 14 Nov 2014 04:17:39 +0000 (09:47 +0530)]
greybus: manifest: improve print message

Suggested-by: Alex Elder <elder@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: manifest: remove extra loop for finding module descriptor
Viresh Kumar [Thu, 13 Nov 2014 12:44:40 +0000 (18:14 +0530)]
greybus: manifest: remove extra loop for finding module descriptor

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: connection: free resources properly on failures
Viresh Kumar [Thu, 13 Nov 2014 12:44:39 +0000 (18:14 +0530)]
greybus: connection: free resources properly on failures

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: interface: free resources properly on failures
Viresh Kumar [Thu, 13 Nov 2014 12:44:38 +0000 (18:14 +0530)]
greybus: interface: free resources properly on failures

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: module: free resources properly on failures
Viresh Kumar [Thu, 13 Nov 2014 12:44:37 +0000 (18:14 +0530)]
greybus: module: free resources properly on failures

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: sysfs: generalize gb_module_attr() to capture more cases
Viresh Kumar [Thu, 13 Nov 2014 12:44:36 +0000 (18:14 +0530)]
greybus: sysfs: generalize gb_module_attr() to capture more cases

Most of the attribute routines are created with gb_module_attr() and few are
left out because they weren't printing 32 bit hexadecimal values.

Extend gb_module_attr() to cover more cases.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: debug: mark debug messages with pr_debug() instead of printk
Viresh Kumar [Thu, 13 Nov 2014 12:44:35 +0000 (18:14 +0530)]
greybus: debug: mark debug messages with pr_debug() instead of printk

Also fix indentation.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: don't set ->dev.driver to NULL when it is already NULL
Viresh Kumar [Thu, 13 Nov 2014 12:44:34 +0000 (18:14 +0530)]
greybus: don't set ->dev.driver to NULL when it is already NULL

Parent objects of 'dev' are allocated with kzalloc() and so all of their fields
are initialized with 0. Hence no need of marking them NULL again.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: Fix missing gb_protocol_exit() on gb_exit()
Viresh Kumar [Thu, 13 Nov 2014 12:44:33 +0000 (18:14 +0530)]
greybus: Fix missing gb_protocol_exit() on gb_exit()

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: manifest: don't free unallocated resources
Viresh Kumar [Thu, 13 Nov 2014 12:44:32 +0000 (18:14 +0530)]
greybus: manifest: don't free unallocated resources

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: manifest: initialize variable during definition
Viresh Kumar [Thu, 13 Nov 2014 12:44:31 +0000 (18:14 +0530)]
greybus: manifest: initialize variable during definition

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: manifest: no need to initialize 'result'
Viresh Kumar [Thu, 13 Nov 2014 12:44:30 +0000 (18:14 +0530)]
greybus: manifest: no need to initialize 'result'

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: gitignore: few more additions
Viresh Kumar [Thu, 13 Nov 2014 12:44:29 +0000 (18:14 +0530)]
greybus: gitignore: few more additions

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: remove unused gb_connection_handler externs
Matt Porter [Wed, 12 Nov 2014 20:59:32 +0000 (15:59 -0500)]
greybus: remove unused gb_connection_handler externs

Remove some leftover cruft from recent refactoring of
connection handlers.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: pass operation type on request receive
Alex Elder [Wed, 12 Nov 2014 21:17:55 +0000 (15:17 -0600)]
greybus: pass operation type on request receive

When an incoming request is received, the operation type is encoded
in the header and is not available in the payload.  Add the
operation type as a parameter to the request_recv method so the
request handler knows what to do.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 years agogreybus: op_cycle doesn't need to be atomic
Alex Elder [Wed, 12 Nov 2014 21:17:54 +0000 (15:17 -0600)]
greybus: op_cycle doesn't need to be atomic

We can update a connection's operation id counter under spinlock,
and thereby avoid the need to maintain it in an atomic variable.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 years agogreybus: simplify pending operations tracking
Alex Elder [Wed, 12 Nov 2014 21:17:53 +0000 (15:17 -0600)]
greybus: simplify pending operations tracking

Greg raised the alarm when I first put in the red-black tree for
tracking pending operations.  The reality as that we're not likely
to have that many operations in flight at any one time, so the
complexity of the red-black tree is most likely unwarranted.  I
already

This pulls out the red-black tree and uses a simple list instead.  A
connection maintains two lists of operations.  An operation starts
on its connection's operations list.  It is moved to the pending
list when its request message is sent.  And it is moved back to
the operations list when the response message arrives.  It is
removed from whatever list it's in when the operation is destroyed.
We reuse the single operation->links field for both lists.

Only outgoing requests are ever "pending."  Incoming requests are
transient--we receive them, process them, send the response, and
then we're done.

Change a few function names so it's clear we're working with the
pending list.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 years agogreybus: move timeout out of gb_operation_insert()
Alex Elder [Wed, 12 Nov 2014 21:17:52 +0000 (15:17 -0600)]
greybus: move timeout out of gb_operation_insert()

Currently, gb_operation_insert() arranges to time out a request if
it takes too long.  Move this out of that function and into
gb_operation_request_send(), so we know it's getting set up after
the request has actually be sent.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 years agogreybus: fix request timeout bug
Alex Elder [Wed, 12 Nov 2014 21:17:51 +0000 (15:17 -0600)]
greybus: fix request timeout bug

This commit changed the timeout behavior for operations:
    6a8732e operation: make the timeout a per-operation thing...

It unfortunately left in place some code that was only
appropriate for per-connection timeouts.  In particular,
the timer for an operation is currently getting started
only if no existing operations are in flight.

Fix that oversight, and schedule an operation's timer
unconditionally.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 years agogreybus: don't assume PAGE_SIZE for URB size
Alex Elder [Wed, 12 Nov 2014 21:17:50 +0000 (15:17 -0600)]
greybus: don't assume PAGE_SIZE for URB size

The buffers allocated for CPort URBS are ES1_GBUF_MSG_SIZE bytes.
But usb_fill_bulk_urb() passes PAGE_SIZE as its size.  They happen
to be the same, but the code is wrong, so fix it.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 years agogreybus: add pwm protocol driver
Matt Porter [Thu, 13 Nov 2014 14:14:13 +0000 (09:14 -0500)]
greybus: add pwm protocol driver

Add a PWM driver that implements the Greybus PWM protocol.

Signed-off-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: kill gbuf->complete
Alex Elder [Thu, 6 Nov 2014 13:01:06 +0000 (07:01 -0600)]
greybus: kill gbuf->complete

The gbuf complete method is a callback that allows the creator of a
gbuf to know when all processing on a gbuf is done.

We now only ever allocate gbufs for use in Greybus operations, and
in that case we only ever supply gb_operation_gbuf_complete() as the
completion callback.  Furthermore, the only place gbuf->complete()
is called is in gb_operation_recv_work().

Knowing this, we can just call gb_operation_gbuf_complete() directly
from gb_operation_recv_work(), and get rid of the gbuf->complete()
method entirely.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
10 years agogreybus: move gb_operation_gbuf_complete()
Alex Elder [Thu, 6 Nov 2014 13:01:05 +0000 (07:01 -0600)]
greybus: move gb_operation_gbuf_complete()

Simple move of a block of code, done as a separate commit to make it
easier to see that's all that's going on.

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