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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2021-06-16 17:28:46 +0900
committerTakashi Iwai <tiwai@suse.de>2021-06-17 11:37:08 +0200
commitd13d6b284d8b80802e3ab1c33f210579884c3060 (patch)
tree3659e2efe00936c2497a0edb5d35102c2f706a52 /sound/firewire/Kconfig
parent36d1a6729be5b0d784f632aa1fd1fd11511e11c0 (diff)
ALSA: firewire-motu: add support for MOTU 828
MOTU 828 is a first model in MOTU FireWire series, produced in 2001. This model consists of three chips: * Texas Instruments TSB41AB1 (Physical layer for IEEE 1394 bus) * Philips Semiconductors 1394L21BE (Link layer for IEEE 1394 bus and packet processing layer) * QuickLogic QuickRAM QL4016 (Data block processing layer and digital signal processing) This commit adds a support for this model, with its unique protocol as version 1. The features of this protocol are: * no MIDI support. * Rx packets have no data chunks for control and status messages. * Tx packets have 2 data chunks for control and status messages in the end of each data block. The chunks consist of data block counter (4 byte) and message (2 byte). * All of settings are represented in bit flag in one quadlet address (0x'ffff'f000'0b00). * When optical interface is configured as S/PDIF, signals of the interface is multiplexed for packets, instead of signals of coaxial interface. * The internal multiplexer is not configured by software. I note that the device has a quirk to mute output voluntarily during receiving batch of packets in the beginning of packet streaming. The operation to unmute should be done by software enough after the device shifts the state, however it's not deterministic. Furthermore, just after switching rate of sampling clock, the device keeps the state longer. This patch manages to sleep 100 msec before unmute operation, but it may fail to release the mute in the case that the rate is changed. As a workaround, users can restart packet streaming at the same rate, or write to specific register from userspace. $ python3 crpp < /sys/bus/firewire/devices/fw1/config_rom ROM header and bus information block ----------------------------------------------------------------- 400 04105c54 bus_info_length 4, crc_length 16, crc 23636 404 31333934 bus_name "1394" 408 20001000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 0, max_rec 1 (4) 40c 0001f200 company_id 0001f2 | 410 00005015 device_id 0000005015 | EUI-64 0001f20000005015 root directory ----------------------------------------------------------------- 414 0004c65c directory_length 4, crc 50780 418 030001f2 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 00035052 directory_length 3, crc 20562 42c 120001f2 specifier id 430 13000001 version 434 17101800 model eui-64 leaf at 438 ----------------------------------------------------------------- 438 0002eeb6 leaf_length 2, crc 61110 43c 0001f200 company_id 0001f2 | 440 00005015 device_id 0000005015 | EUI-64 0001f20000005015 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210616082847.124688-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/Kconfig')
-rw-r--r--sound/firewire/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index a08a0dbfc951..a70732bbddab 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -165,6 +165,7 @@ config SND_FIREWIRE_MOTU
select SND_HWDEP
help
Say Y here to enable support for FireWire devices which MOTU produced:
+ * 828
* 828mk2
* Traveler
* Ultralite