1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * bebob_yamaha.c - a part of driver for BeBoB based devices 4 * 5 * Copyright (c) 2013-2014 Takashi Sakamoto 6 */ 7 8 #include "./bebob.h" 9 10 /* 11 * NOTE: 12 * Yamaha GO44 is not designed to be used as stand-alone mixer. So any streams 13 * must be accompanied. If changing the state, a LED on the device starts to 14 * blink and its sync status is false. In this state, the device sounds nothing 15 * even if streaming. To start streaming at the current sampling rate is only 16 * 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 use 21 * 'Extended Stream Format Information Command - Single Request' in 'Additional 22 * AVC commands' defined by BridgeCo. 23 * This ALSA driver don't do this because a bit tiresome. Then isochronous 24 * streaming with many asynchronous transactions brings sounds with noises. 25 * Unfortunately current 'ffado-mixer' generated many asynchronous transaction 26 * to observe device's state, mainly check cmp connection and signal format. I 27 * 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 as 30 * Yamaha GO 44 and GO 46. Yamaha and Terratec had cooperated for these models. 31 */ 32 33 static const enum snd_bebob_clock_type clk_src_types[] = { 34 SND_BEBOB_CLOCK_TYPE_INTERNAL, 35 SND_BEBOB_CLOCK_TYPE_EXTERNAL, /* S/PDIF */ 36 }; 37 static int 38 clk_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 } 51 static 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 }; 56 static const struct snd_bebob_rate_spec rate_spec = { 57 .get = &snd_bebob_stream_get_rate, 58 .set = &snd_bebob_stream_set_rate, 59 }; 60 const struct snd_bebob_spec yamaha_terratec_spec = { 61 .clock = &clock_spec, 62 .rate = &rate_spec, 63 .meter = NULL 64 }; 65