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Diffstat (limited to '')
-rw-r--r-- | sound/firewire/bebob/bebob_yamaha_terratec.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/sound/firewire/bebob/bebob_yamaha_terratec.c b/sound/firewire/bebob/bebob_yamaha_terratec.c new file mode 100644 index 000000000..ce1975e6a --- /dev/null +++ b/sound/firewire/bebob/bebob_yamaha_terratec.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * bebob_yamaha.c - a part of driver for BeBoB based devices + * + * Copyright (c) 2013-2014 Takashi Sakamoto + */ + +#include "./bebob.h" + +/* + * NOTE: + * Yamaha GO44 is not designed to be used as stand-alone mixer. So any streams + * must be accompanied. If changing the state, a LED on the device starts to + * blink and its sync status is false. In this state, the device sounds nothing + * even if streaming. To start streaming at the current sampling rate is only + * way to recover this state. GO46 is better for stand-alone mixer. + * + * Both of them have a capability to change its sampling rate up to 192.0kHz. + * At 192.0kHz, the device reports 4 PCM-in, 1 MIDI-in, 6 PCM-out, 1 MIDI-out. + * But Yamaha's driver reduce 2 PCM-in, 1 MIDI-in, 2 PCM-out, 1 MIDI-out to use + * 'Extended Stream Format Information Command - Single Request' in 'Additional + * AVC commands' defined by BridgeCo. + * This ALSA driver don't do this because a bit tiresome. Then isochronous + * streaming with many asynchronous transactions brings sounds with noises. + * Unfortunately current 'ffado-mixer' generated many asynchronous transaction + * to observe device's state, mainly check cmp connection and signal format. I + * recommend users to close ffado-mixer at 192.0kHz if mixer is needless. + * + * Terratec PHASE 24 FW and PHASE X24 FW are internally the same as + * Yamaha GO 44 and GO 46. Yamaha and Terratec had cooperated for these models. + */ + +static const enum snd_bebob_clock_type clk_src_types[] = { + SND_BEBOB_CLOCK_TYPE_INTERNAL, + SND_BEBOB_CLOCK_TYPE_EXTERNAL, /* S/PDIF */ +}; +static int +clk_src_get(struct snd_bebob *bebob, unsigned int *id) +{ + int err; + + err = avc_audio_get_selector(bebob->unit, 0, 4, id); + if (err < 0) + return err; + + if (*id >= ARRAY_SIZE(clk_src_types)) + return -EIO; + + return 0; +} +static const struct snd_bebob_clock_spec clock_spec = { + .num = ARRAY_SIZE(clk_src_types), + .types = clk_src_types, + .get = &clk_src_get, +}; +static const struct snd_bebob_rate_spec rate_spec = { + .get = &snd_bebob_stream_get_rate, + .set = &snd_bebob_stream_set_rate, +}; +const struct snd_bebob_spec yamaha_terratec_spec = { + .clock = &clock_spec, + .rate = &rate_spec, + .meter = NULL +}; |