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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * bebob_yamaha.c - a part of driver for BeBoB based devices4 *5 * Copyright (c) 2013-2014 Takashi Sakamoto6 */7 8#include "./bebob.h"9 10/*11 * NOTE:12 * Yamaha GO44 is not designed to be used as stand-alone mixer. So any streams13 * must be accompanied. If changing the state, a LED on the device starts to14 * blink and its sync status is false. In this state, the device sounds nothing15 * even if streaming. To start streaming at the current sampling rate is only16 * way to recover this state. GO46 is better for stand-alone mixer.17 *18 * Both of them have a capability to change its sampling rate up to 192.0kHz.19 * At 192.0kHz, the device reports 4 PCM-in, 1 MIDI-in, 6 PCM-out, 1 MIDI-out.20 * But Yamaha's driver reduce 2 PCM-in, 1 MIDI-in, 2 PCM-out, 1 MIDI-out to use21 * 'Extended Stream Format Information Command - Single Request' in 'Additional22 * AVC commands' defined by BridgeCo.23 * This ALSA driver don't do this because a bit tiresome. Then isochronous24 * streaming with many asynchronous transactions brings sounds with noises.25 * Unfortunately current 'ffado-mixer' generated many asynchronous transaction26 * to observe device's state, mainly check cmp connection and signal format. I27 * recommend users to close ffado-mixer at 192.0kHz if mixer is needless.28 *29 * Terratec PHASE 24 FW and PHASE X24 FW are internally the same as30 * Yamaha GO 44 and GO 46. Yamaha and Terratec had cooperated for these models.31 */32 33static const enum snd_bebob_clock_type clk_src_types[] = {34 SND_BEBOB_CLOCK_TYPE_INTERNAL,35 SND_BEBOB_CLOCK_TYPE_EXTERNAL, /* S/PDIF */36};37static int38clk_src_get(struct snd_bebob *bebob, unsigned int *id)39{40 int err;41 42 err = avc_audio_get_selector(bebob->unit, 0, 4, id);43 if (err < 0)44 return err;45 46 if (*id >= ARRAY_SIZE(clk_src_types))47 return -EIO;48 49 return 0;50}51static const struct snd_bebob_clock_spec clock_spec = {52 .num = ARRAY_SIZE(clk_src_types),53 .types = clk_src_types,54 .get = &clk_src_get,55};56static const struct snd_bebob_rate_spec rate_spec = {57 .get = &snd_bebob_stream_get_rate,58 .set = &snd_bebob_stream_set_rate,59};60const struct snd_bebob_spec yamaha_terratec_spec = {61 .clock = &clock_spec,62 .rate = &rate_spec,63 .meter = NULL64};65