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(unit: bebob->unit, subunit_id: 0, fb_id: 4, num: 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 | |