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* ALSA: firewire-motu: add support for MOTU 896 mk3 FireWire and HybridTakashi Sakamoto2024-01-291-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mark of the Unicorn released 896 mk3 FireWire in 2008 as part of the third generation of its FireWire series. In 2011, 896 mk3 hybrid was released to support USB protocol. It supports sampling transfer frequency up to 192.0 kHz. The packet format differs depending on both of current sampling transfer frequency and the type of signal in optical interfaces. The model supports transmission of PCM frames as well as MIDI messages. The 896 mk3 FireWire consists of below ICs: * Texas Instruments TSB41AB2 * Xilinx Spartan-3A FPGA, XC3S500E * Texas Instruments TMS320C6722 * Microchip (Atmel) AT91SAM SAM7S256 It supports sampling transfer frequency up to 192.0 kHz. The packet format differs depending on both of current sampling transfer frequency and the type of signal in two pairs of optical interfaces. The model supports transmission of PCM frames, while has no port for MIDi messages. The model supports command mechanism to configure internal DSP. Hardware meter information is available in the first 2 chunks of each data block of tx packet. This commit adds support for it. The 896 mk3 FireWire is just tested, but the 896 mk3 Hybrid is not yet. $ config-rom-pretty-printer < motu-896mk3fw.img ROM header and bus information block ----------------------------------------------------------------- 1024 04100ce1 bus_info_length 4, crc_length 16, crc 3297 1028 31333934 bus_name "1394" 1032 20ff7000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256) 1036 0001f200 company_id 0001f2 | 1040 00093add device_id 0000604893 | EUI-64 0547556791237341 root directory ----------------------------------------------------------------- 1044 0004ef04 directory_length 4, crc 61188 1048 030001f2 vendor 1052 0c0083c0 node capabilities: per IEEE 1394 1056 d1000002 --> unit directory at 1064 1060 8d000005 --> eui-64 leaf at 1080 unit directory at 1064 ----------------------------------------------------------------- 1064 0003998d directory_length 3, crc 39309 1068 120001f2 specifier id 1072 13000017 version 1076 17101800 model eui-64 leaf at 1080 ----------------------------------------------------------------- 1080 0002cc82 leaf_length 2, crc 52354 1084 0001f200 company_id 0001f2 | 1088 00093add device_id 0000604893 | EUI-64 0547556791237341 $ config-rom-pretty-printer < motu-896mk3hybrid.img ROM header and bus information block ----------------------------------------------------------------- 1024 04103cbe bus_info_length 4, crc_length 16, crc 15550 1028 31333934 bus_name "1394" 1032 20ff7000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256) 1036 0001f200 company_id 0001f2 | 1040 000ae601 device_id 0000714241 | EUI-64 0547556791346689 root directory ----------------------------------------------------------------- 1044 0004ef04 directory_length 4, crc 61188 1048 030001f2 vendor 1052 0c0083c0 node capabilities: per IEEE 1394 1056 d1000002 --> unit directory at 1064 1060 8d000005 --> eui-64 leaf at 1080 unit directory at 1064 ----------------------------------------------------------------- 1064 000394ac directory_length 3, crc 38060 1068 120001f2 specifier id 1072 13000037 version 1076 17102800 model eui-64 leaf at 1080 ----------------------------------------------------------------- 1080 0002cf69 leaf_length 2, crc 53097 1084 0001f200 company_id 0001f2 | 1088 000ae601 device_id 0000714241 | EUI-64 0547556791346689 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20240129022711.254383-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add support for MOTU Track 16Takashi Sakamoto2021-11-081-3/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mark of the Unicorn designed Track 16 2011 as one of models in third generation of its FireWire series. The model is already discontinued. It consists of below ICs: * Texas Instruments TSB41AB1 * Microchip (SMSC) USB3300 * Xilinx Spartan-3A FPGA, XC3S700A * Texas Instruments TMS320C6722 * Microchip (Atmel) AT91SAM SAM7S512 It supports sampling transfer frequency up to 192.0 kHz. The packet format differs depending on both of current sampling transfer frequency and the type of signal in optical interfaces. The model supports transmission of PCM frames as well as MIDI messages. The model supports command mechanism to configure internal DSP. Hardware meter information is available in the first 2 chunks of each data block of tx packet. This commit adds support for it. $ cd linux-firewire-tools/src $ python crpp < /sys/bus/firewire/devices/fw1/config_rom ROM header and bus information block ----------------------------------------------------------------- 400 04107d95 bus_info_length 4, crc_length 16, crc 32149 404 31333934 bus_name "1394" 408 20ff7000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256) 40c 0001f200 company_id 0001f2 | 410 000a83c4 device_id 00000a83c4 | EUI-64 0001f200000a83c4 root directory ----------------------------------------------------------------- 414 0004ef04 directory_length 4, crc 61188 418 030001f2 vendor 41c 0c0083c0 node capabilities per IEEE 1394 420 d1000002 --> unit directory at 428 424 8d000005 --> eui-64 leaf at 438 unit directory at 428 ----------------------------------------------------------------- 428 00035b04 directory_length 3, crc 23300 42c 120001f2 specifier id 430 13000039 version 434 17102800 model eui-64 leaf at 438 ----------------------------------------------------------------- 438 0002b25f leaf_length 2, crc 45663 43c 0001f200 company_id 0001f2 | 440 000a83c4 device_id 00000a83c4 | EUI-64 0001f200000a83c4 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20211107110644.23511-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add support for MOTU Traveler mk3Takashi Sakamoto2021-11-041-3/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mark of the Unicorn (MOTU) shipped Traveler mk3 as one of models in third generation of its FireWire series, and discontinued it already. The model consists of below ICs: * Texas Instruments TSB41AB2 * Phillips Semiconductors PDI1394L40 * Altera cyclone EP1C3 * Texas Instruments TMS320VC5402 It supports sampling transfer frequency up to 192.0 kHz. The packet format differs depending on both of current sampling transfer frequency and whether to enable ADAT channels in rx/tx packets. The model supports transmission of PCM frames as well as MIDI messages. The model supports command mechanism to configure internal DSP. Hardware meter information is available in the first 2 chunks of each data block of tx packet. This commit adds support for it. $ cd linux-firewire-tools/src $ python crpp < /sys/bus/firewire/devices/fw1/config_rom ROM header and bus information block ----------------------------------------------------------------- 400 0410af0a bus_info_length 4, crc_length 16, crc 44810 404 31333934 bus_name "1394" 408 20ff7000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256) 40c 0001f200 company_id 0001f2 | 410 00090911 device_id 0000090911 | EUI-64 0001f20000090911 root directory ----------------------------------------------------------------- 414 0004ef04 directory_length 4, crc 61188 418 030001f2 vendor 41c 0c0083c0 node capabilities per IEEE 1394 420 d1000002 --> unit directory at 428 424 8d000005 --> eui-64 leaf at 438 unit directory at 428 ----------------------------------------------------------------- 428 00031733 directory_length 3, crc 5939 42c 120001f2 specifier id 430 1300001b version 434 17102800 model eui-64 leaf at 438 ----------------------------------------------------------------- 438 00028484 leaf_length 2, crc 33924 43c 0001f200 company_id 0001f2 | 440 00090911 device_id 0000090911 | EUI-64 0001f20000090911 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20211104110627.94469-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add message parser for meter information in command DSP ↵Takashi Sakamoto2021-10-151-4/+6
| | | | | | | | | | | | | | | | model Some of MOTU models allows software to configure their DSP parameters by command included in asynchronous transaction. The models multiplex messages for hardware meters into isochronous packet as well as PCM frames. For convenience, I call them as 'command DSP' model. This patch adds message parser for them to gather hardware meter information. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20211015080826.34847-3-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add message parser to gather meter information in ↵Takashi Sakamoto2021-10-151-1/+3
| | | | | | | | | | | | | | | | | register DSP model Some of MOTU models allows software to configure their DSP parameters by accessing to their registers. The models multiplex messages for status of DSP into isochronous packet as well as PCM frames. The message includes information of hardware metering, MIDI message, current parameters of DSP. For my convenience, I call them as 'register DSP' model. This patch adds message parser for them to gather hardware meter information. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20211015080826.34847-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: use macro instead of magic number for clock source in ↵Takashi Sakamoto2021-06-231-7/+13
| | | | | | | | | | | v3 protocol This commit adds a series of macro for source of sampling clock in version 3 protocol. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210623075941.72562-8-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: code refactoring for source detection of sampling clock ↵Takashi Sakamoto2021-06-231-47/+12
| | | | | | | | | | | | in v3 protocol Current implementation of driver has two similar helper functions for source detection of sampling clock. This commit merges them as a code refactoring. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210623075941.72562-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: fix rx packet format at higher rate for MOTU 828 mk3 HybridTakashi Sakamoto2021-06-181-3/+12
| | | | | | | | | | | | | | I assumed that the combination of packet formats for MOTU 828 mk3 Hybrid is the same as MOTU 828 mk3 FireWire. However at higher sampling rate, it is different. MOTU 828 mk3 Hybrid has additional 4 dummy data chunks for rx packet. This commit fixes the issue to which I address at a commit f2ac3b839540 ("ALSA: firewire-motu: sequence replay for source packet header"). Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210618040713.114611-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: wait for notification when changing clock configuration ↵Takashi Sakamoto2020-06-151-3/+13
| | | | | | | | | | | | | | | | | for protocol v3 It costs expensive to change clock configuration for models of protocol version 3. In current implementation, speculative strategy is used to finish the operation; just waiting for 4 seconds. As long as I investigate, when accepting and changing clock status actually, the device sends notification with mask. This commit uses wise way to wait for the notification after changing sampling clock rate during 4 seconds. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200614141221.53527-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add support for MOTU UltraLite-mk3 (FireWire only model)Takashi Sakamoto2020-05-251-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | UltraLite-mk3 was shipped 2008 by MOTU. This model has two lineups; FireWire-only and FireWire/USB2.0 Hybrid model. Additionally, the latter has two variants in respect of the type of IEEE 1394 connector; alpha and beta connector. This commit adds support for the FireWire-only model, which is already discontinued. $ python3 crpp < /sys/bus/firewire/devices/fw1/config_rom ROM header and bus information block ----------------------------------------------------------------- 400 0410353a bus_info_length 4, crc_length 16, crc 13626 404 31333934 bus_name "1394" 408 20ff7000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256) 40c 0001f200 company_id 0001f2 | 410 000902c7 device_id 00000902c7 | EUI-64 0001f200000902c7 root directory ----------------------------------------------------------------- 414 0004ef04 directory_length 4, crc 61188 418 030001f2 vendor 41c 0c0083c0 node capabilities per IEEE 1394 420 d1000002 --> unit directory at 428 424 8d000005 --> eui-64 leaf at 438 unit directory at 428 ----------------------------------------------------------------- 428 00035556 directory_length 3, crc 21846 42c 120001f2 specifier id 430 13000019 version 434 17100800 model eui-64 leaf at 438 ----------------------------------------------------------------- 438 0002f3c5 leaf_length 2, crc 62405 43c 0001f200 company_id 0001f2 | 440 000902c7 device_id 00000902c7 | EUI-64 0001f200000902c7 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200523071733.170129-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: refactoring protocol v3 for clock source getterTakashi Sakamoto2020-05-221-26/+72
| | | | | | | | | This commit splits the method to get clock source for protocol version 3 so that model-dependent operations are explicitly defined. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-14-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: remove obsoleted codesTakashi Sakamoto2020-05-221-156/+2
| | | | | | | | | The way to decide CIP payload size by calculation with any flag is now obsoleted. This commit removes the codes. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-12-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add alternative functions to detect packet format for ↵Takashi Sakamoto2020-05-221-5/+61
| | | | | | | | | | | protocol v3 This commit adds alternative functions to detect packet format so that each function corresponds to each model. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-9-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add model-specific table of chunk countTakashi Sakamoto2020-05-221-1/+6
| | | | | | | | | | | | | | | | | | | In MOTU protocol, data block consists of SPH and 24-bit chunks aligned to quadlet. The number of chunks per data block is specific to model. For models with optical interface, the number differs depending on I/O settings for the interface (ADAT, TOSLINK). Currently the number is calculated from flags in model-specific data. However this is weak in the case that the model has quirks. Actually, for quirks of some models, flags are used against their original meanings. This commit adds model-specific table of chunk count. For future integration, this table is based on the calculation. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: drop protocol structureTakashi Sakamoto2020-05-221-5/+0
| | | | | | | | Now protocol structure becomes useless. This commit drops it. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-6-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add wrapper functions for protocol-dependent operationsTakashi Sakamoto2020-05-221-11/+9
| | | | | | | | | This commit adds helper functions which wraps function call for each protocol. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-5-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: localize protocol dataTakashi Sakamoto2020-05-221-1/+4
| | | | | | | | | This commit adds enumerations of protocol version to localize protocol data. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-4-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: move spec data to v3 protocol fileTakashi Sakamoto2020-05-221-0/+42
| | | | | | | | | | | The most of members in spec data is used in each protocol file. It's better to capsulate the data to the file. This commit moves the data to the file for protocol version 3. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200519111641.123211-3-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: detect SPH source of sampling clockTakashi Sakamoto2019-10-301-0/+2
| | | | | | | | | | | | | In MOTU FireWire series, devices have a mode to generate sampling clock from a sequence of source packet header (SPH) included in each data block of received packet. This mode is used for several purposes such as mode for SMPTE time code, sync to the other sound cards and so on. This commit adds support for the SPH mode. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191030080644.1704-4-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: fix wrong spelling for macroTakashi Sakamoto2019-10-301-1/+1
| | | | | | | | Just replace 'SEPARETED' with 'SEPARATED' for macro. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191030080644.1704-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 345Thomas Gleixner2019-06-051-2/+1
| | | | | | | | | | | | | | | | | | | Based on 1 normalized pattern(s): licensed under the terms of the gnu general public license version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 88 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000437.521539229@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ALSA: firewire-motu: add a flag for AES/EBU on XLR interfaceTakashi Sakamoto2018-06-191-0/+5
| | | | | | | | | MOTU Traveler supports AES/EBU on XLR interface and data block of rx/tx packet includes two chunk for the interface. This commit adds a flag for this purpose. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add a flag for chunks for main 1/2 outTakashi Sakamoto2018-06-191-5/+9
| | | | | | | | | | | This driver explicitly assumes that all of supported models have main data chunk separated from chunk for analog ports. However, MOTU Traveler doesn't support the separated main data chunk. This commit adds a flag for the separated main data chunk. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add specification flag for position of flag for MIDI ↵Takashi Sakamoto2017-08-211-5/+0
| | | | | | | | | | | | | | | | messages In protocols of MOTU FireWire series, when transferring MIDI messages, transmitter set existence flag to one byte on first several quadlets. The position differs depending on protocols and models, however two cases are confirmed; in 5th byte and 8th byte from MSB side. This commit adds a series of specification flag to describe them. When the existence flag is in the 5th byte, SND_MOTU_SPEC_[R|T]X_MIDI_2ND_Q is used. Else, another set of the flag is used. Here, '_Q' means quadlet. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: remove invalid bitshift for register valueTakashi Sakamoto2017-04-051-2/+1
| | | | | | | | | | | | | | In protocol version 3, drivers can read current sampling clock status from register 0x'ffff'f000'0b14. 8 bits of LSB of this register represents type of signal as source of clock. Current driver code includes invalid bitshift to handle the parameter. This commit fixes the bug. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Fixes: 5992e30034c4 ("ALSA: firewire-motu: add support for MOTU 828mk3 (FireWire/Hybrid) as a model with protocol version 3") Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: add support for MOTU 828mk3 (FireWire/Hybrid) as a ↵Takashi Sakamoto2017-03-281-0/+312
model with protocol version 3 MOTU 828mk3 (FireWire/Hybrid) is one of third generation in MOTU FireWire series, produced in 2008/2014. This model consists of three chips for functionality on IEEE 1394 bus: * TI TSB41AB2 (Physical layer for IEEE 1394 bus) * Xilinx Spartan-3E FPGA Family (Link layer for IEEE 1394 bus, packet processing and data block processing layer) * TI TMS320C6722 (Digital signal processing) This commit adds a support for this model, with its unique protocol as version 3. This protocol has some additional features to protocol version 2. * Support several optical interfaces. * Support a data chunk for return of reverb effect. * Have a quirk of tx packets. * Support heartbeat asynchronous transaction. In this protocol, series of transferred packets has some quirks. Below fields in CIP headers of the packets are out of IEC 61883-1: - SID (source node id): always 0x0d - DBS (data block size): always 0x04 - DBC (data block counter): always 0x00 - EOH (End of header): always 0x00 Below is an actual sample of transferred packets. quads CIP1 CIP2 520 0x0D040400 0x22FFFFFF 8 0x0D040400 0x22FFFFFF 520 0x0D040400 0x22FFFFFF 520 0x0D040400 0x22FFFFFF 8 0x0D040400 0x22FFFFFF Status of clock is configured by write transactions to 0x'ffff'f000'0b14, as well as version 2, while meanings of fields are different from the former protocols. Modes of optical interfaces are configured by write transactions to 0x'ffff'f000'0c94. Drivers can register its address to receive heatbeat transactions from the unit. 0x'ffff'f000'0b0c is for the higher part and 0x'ffff'f000'0b10 is for the lower part. Nevertheless, this feature is not useless for this driver and this commit omits it. Each data block consists of two parts in a point of the number of included data chunks. In both of 'fixed' and 'differed' parts, the number of included data blocks are a multiple of 4, thus depending on models there's some empty data chunks. For example, 828mk3 includes one pair of empty data chunks in its fixed part. When optical interface is configured to S/PDIF, 828mk3 includes one pair of empty data chunks in its differed part. To reduce consumption of CPU cycles with additional conditions/loops, this commit just exposes these empty chunks to user space as PCM channels. Additionally, 828mk3 has a non-negligible overhead to change its sampling transfer frequency. When softwares send asynchronous transaction to perform it, LED on the unit starts to blink. In a worst case, it continues blink during several seconds; e.g. 10 seconds. When stopping blinking, the unit seems to be prepared for the requested sampling transfer frequency. To wait for the preparation, this commit forces the driver to call task scheduler and applications sleeps for 4 seconds. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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