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