ALSA: firewire-tascam: add note for FE-8

ALSA: firewire-tascam: add note for FE-8

TASCAM FE-8 is the rest of model in TASCAM FireWire series. This device
has no functionality to process audio signal and MIDI messages. Instead,
it transfers control messages to host system corresponding to operations
for some faders, buttons and knobs on its surface.

Unlike the other devices in this series, the control messages are
transmitted by asynchronous transactions. Some registers of device are
used for registration of destination address for the transaction. The
transaction includes quadlet-aligned data up to 32 quadlets.

Userspace applications can receive the transaction and parse it for
control message via Linux FireWire subsystem, without any support by
ALSA firewire-tascam driver. Therefore the driver gives no support
for it.

This commit removes placeholder for FE-8 and add some comment for its
functionalities as notes.

$ python2 linux-firewire-utils/src/crpp < ~/git/am-config-rom/tascam/tascam-fe8.img
               ROM header and bus information block
               -----------------------------------------------------------------
400  040f4798  bus_info_length 4, crc_length 15, crc 18328 (should be 14256)
404  31333934  bus_name "1394"
408  20ff7002  irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256)
40c  00022eff  company_id 00022e     |
410  a094dcb7  device_id ffa094dcb7  | EUI-64 00022effa094dcb7

               root directory
               -----------------------------------------------------------------
414  0004bccc  directory_length 4, crc 48332
418  0300022e  vendor
41c  0c0083c0  node capabilities per IEEE 1394
420  8d000006  --> eui-64 leaf at 438
424  d1000001  --> unit directory at 428

               unit directory at 428
               -----------------------------------------------------------------
428  0003eda4  directory_length 3, crc 60836
42c  1200022e  specifier id
430  13800001  version
434  d4000004  --> dependent info directory at 444

               eui-64 leaf at 438
               -----------------------------------------------------------------
438  0002461e  leaf_length 2, crc 17950
43c  00022eff  company_id 00022e     |
440  a094dcb7  device_id ffa094dcb7  | EUI-64 00022effa094dcb7

               dependent info directory at 444
               -----------------------------------------------------------------
444  0002ae47  directory_length 2, crc 44615
448  81000002  --> descriptor leaf at 450
44c  82000006  --> bus dependent info leaf at 464

               descriptor leaf at 450
               -----------------------------------------------------------------
450  0004a79e  leaf_length 4, crc 42910
454  00000000  textual descriptor
458  00000000  minimal ASCII
45c  54415343  "TASC"
460  414d0000  "AM"

               bus dependent info leaf at 464
               -----------------------------------------------------------------
464  0004a7d8  leaf_length 4, crc 42968
468  00000000
46c  00000000
470  46452d38
474  00000000

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20190906125544.13800-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>