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8ac98a35 TS |
1 | /* |
2 | * bebob_yamaha.c - a part of driver for BeBoB based devices | |
3 | * | |
4 | * Copyright (c) 2013-2014 Takashi Sakamoto | |
5 | * | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include "./bebob.h" | |
10 | ||
11 | /* | |
12 | * NOTE: | |
13 | * Yamaha GO44 is not designed to be used as stand-alone mixer. So any streams | |
14 | * must be accompanied. If changing the state, a LED on the device starts to | |
15 | * blink and its sync status is false. In this state, the device sounds nothing | |
16 | * even if streaming. To start streaming at the current sampling rate is only | |
17 | * way to revocer this state. GO46 is better for stand-alone mixer. | |
18 | * | |
19 | * Both of them have a capability to change its sampling rate up to 192.0kHz. | |
20 | * At 192.0kHz, the device reports 4 PCM-in, 1 MIDI-in, 6 PCM-out, 1 MIDI-out. | |
21 | * But Yamaha's driver reduce 2 PCM-in, 1 MIDI-in, 2 PCM-out, 1 MIDI-out to use | |
22 | * 'Extended Stream Format Information Command - Single Request' in 'Additional | |
23 | * AVC commands' defined by BridgeCo. | |
24 | * This ALSA driver don't do this because a bit tiresome. Then isochronous | |
25 | * streaming with many asynchronous transactions brings sounds with noises. | |
26 | * Unfortunately current 'ffado-mixer' generated many asynchronous transaction | |
27 | * to observe device's state, mainly check cmp connection and signal format. I | |
28 | * reccomend users to close ffado-mixer at 192.0kHz if mixer is needless. | |
29 | */ | |
30 | ||
e7ced413 | 31 | static const char *const clk_src_labels[] = {SND_BEBOB_CLOCK_INTERNAL, "SPDIF"}; |
8ac98a35 TS |
32 | static int |
33 | clk_src_get(struct snd_bebob *bebob, unsigned int *id) | |
34 | { | |
35 | return avc_audio_get_selector(bebob->unit, 0, 4, id); | |
36 | } | |
37 | static struct snd_bebob_clock_spec clock_spec = { | |
38 | .num = ARRAY_SIZE(clk_src_labels), | |
39 | .labels = clk_src_labels, | |
40 | .get = &clk_src_get, | |
41 | }; | |
42 | static struct snd_bebob_rate_spec rate_spec = { | |
43 | .get = &snd_bebob_stream_get_rate, | |
44 | .set = &snd_bebob_stream_set_rate, | |
45 | }; | |
46 | struct snd_bebob_spec yamaha_go_spec = { | |
47 | .clock = &clock_spec, | |
48 | .rate = &rate_spec, | |
49 | .meter = NULL | |
50 | }; |