speakers: Rename to oxfw and rename some members

This commit renames 'firewire-speakers' to 'oxfw' to enhance support for
devices which based on OXFW970/971. A line for MODULE_ALIAS is added.

Additionally, to help for works in followed paches, some members
in private structure are renamed.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Move to its own directory

Followed commits add much codes. To make the work easy, this commit creates
own directory and move current file to it.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Split stream functionality to a new file and add a header file

This is a help for works in followed patches.

And this commit remove 'fw_unit_get()/fw_unit_put()' because these
are called by helper functions in 'snd-firewire-lib'.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Split PCM functionality to a new file

This is a help for works in followed patches.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Split control functionality to a new file

This is a help for works in followed patches.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Change the way to name card

The 'struct snd_card' has 4 members for name. They're 'driver', 'shortname',
'longname' and 'mixername'. This commit names these 4 members according to
two members in model-specific structure and reduce rest of members in the
structure.

The reason that alias names are still used it that currently supported devices,
Griffin FireWave and LaCie Firewire Speaker have too long names for model and
vendor field in their config rom to be over allocated buffer for the names.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Change the way to make PCM rules/constraints

For PCM rules/constrains, drivers need to know stream formation at each
supported sampling rates in advance. This commit adds
'struct snd_oxfw_stream_formation' to save formation information to create
PCM rules/constraints.

According to datasheet of OXFW970/971, they support 32.0kHz to 196.0kHz.
As long as developers investigate, some devices are confirmed to have several
entries for the same sampling rate.
oxfw: Add proc interface for debugging purpose

This commit adds proc interface to get information about:
 - stream formation
 - current sampling rate
oxfw: Change the way to start stream

In past commit, this driver can keep stream formations for each sampling
rate. So its stream functionality can decide stream formations when given
some parameters.

This commit moves related codes from PCM functionality to stream
functionality.
oxfw: Change the way to decide stream formations via AV/C stream format command

OXFW970/971 may supports AV/C Stream Format Information Specification 1.1
Working Draft (Apr 2005, 1394TA). This commit changes the way to decide stream
formations via some commands in the specification.

This commit adds 'EXTENDED STREAM FORMAT INFORMATION' command. This command
has two subfunctions, 'SINGLE' and 'LIST'. Drivers can use 'SINGLE' subfunction
to know/set current formation of AMDTP stream, Drivers can use 'LIST'
subfunction to know an available formation of AMDTP stream in a certain sampling
rate.

But some devices don't implement the 'LIST' subfunction. So this commit uses
an assumption that 'if they don't implement it, they don't change stream
formation depending on current each sampling rate'. With this assumption, this
driver generates formations for such devices by:
 1.getting current formation by SINGLE subfunction
 2.getting supported sampling rates
 3.applying current formation for all of supported sampling rates
oxfw: Add a quirk for Griffin FireWave

Griffin FireWave has 7 entries for stream formation. But via 'LIST'
subfunction of AV/C Stream Format Information command, 6 of
them can be retrieved. The rest can be retrieved via 'SINGLE'
subfunction of the command.

This commit adds a workaround for this quirk.
oxfw: Add support for Behringer/Mackie devices

Some devices produced by Behringer/Mackie are based on OXFW970/971. This
commit adds support for them. Additionally, this commit changes the way to
name card with some information in config rom.

The devices support capture/playback of PCM-samples and some of them
supports capture/playback of MIDI messages. These functionalities are
implemented by followed commits.
oxfw: Add support AMDTP in-stream and PCM capture

Previous commit adds support for some devices which can capture PCM samples.
These devices transmit AMDTP stream in non-blocking mode. This commit adds
functionality to handle AMDTP incoming stream and to capture PCM samples.

OXFW seems to have two quirks:
 - Transmits packets with non-zero dbc in its beginning
 - Transmits packets with wrong values in syt field

For the first quirk, this commit adds CIP_SKIP_INIT_DBC_CHECK flag for
incoming stream to skip first check of dbc.

For the second quirk, this commit doesn't add duplex stream which
Fireworks/BeBoB drivers use. So OXFW driver generates syt value for outgoing
stream.

Here are examples of a sequence of packets transmitted by Behringer F-Control
Audio 202. There are differences between sequences of syt value when OXFW
driver transfers outgoing stream or not. It's noticable that there is no
packets with 'No Information' code.

When driver gives no outgoing stream:
Index	Payload	CIP_Header_0	CIP_Header_1
38	14	00020092	900103D1
39	12	00020098	900102FF
40	12	0002009D	9001027F
41	14	000200A2	90010396
42	14	000200A8	900102E8
43	12	000200AE	90010219
44	14	000200B3	90010331
45	12	000200B9	9001025F
46	14	000200BE	90010376
47	12	000200C4	900102A1
00	12	000200C9	9001023E
01	14	000200CE	90010358
02	12	000200D4	90010289
03	16	000200D9	900103A3
04	12	000200E0	900102DD
05	14	000200E5	900103F1
06	12	000200EB	90010335
07	12	000200F0	90010263
08	14	000200F5	9001037C
09	12	000200FB	900102AE

When driver gives outgoing stream:
Index	Payload	CIP_Header_0	CIP_Header_1
38	12	000200BD	900104A8
39	14	000200C2	900104A8
40	12	000200C8	900104AC
41	14	000200CD	900104A9
42	12	000200D3	900104B1
43	14	000200D8	900104A8
44	12	000200DE	900104AA
45	14	000200E3	900104A9
46	14	000200E9	900104AE
47	12	000200EF	900104A8
00	14	000200F4	900104AD
01	12	000200FA	900104A7
02	14	000200FF	900104A9
03	12	00020005	900104A9
04	14	0002000A	900104B1
05	12	00020010	900104AA
06	14	00020015	900104AD
07	12	0002001B	900104A7
08	14	00020020	900104AC
09	12	00020026	900104A7

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
oxfw: Add support for capture/playback MIDI messages

This commit adds MIDI functionality with an assumption of 'if the device
has MIDI comformant data channels in its stream formation, the device has
one MIDI port'.

When no streams have already started, MIDI functionality starts stream
with current sampling rate.

When MIDI functionality has already starts some streams and PCM
functionality is going to start streams at different sampling rate,
this driver stops streams once and changes sampling rate, then restarts
streams for both PCM/MIDI substreams.
oxfw: Add hwdep interface

This interface is designed for mixer/control application. By using hwdep
interface, an application can get information about firewire node, can
lock/unlock kernel streaming and can get notification at starting/stopping
kernel streaming.