treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / media / pci / cx18 / cx18-audio.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  cx18 audio-related functions
4  *
5  *  Derived from ivtv-audio.c
6  *
7  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
8  */
9
10 #include "cx18-driver.h"
11 #include "cx18-io.h"
12 #include "cx18-cards.h"
13 #include "cx18-audio.h"
14
15 #define CX18_AUDIO_ENABLE    0xc72014
16 #define CX18_AI1_MUX_MASK    0x30
17 #define CX18_AI1_MUX_I2S1    0x00
18 #define CX18_AI1_MUX_I2S2    0x10
19 #define CX18_AI1_MUX_843_I2S 0x20
20
21 /* Selects the audio input and output according to the current
22    settings. */
23 int cx18_audio_set_io(struct cx18 *cx)
24 {
25         const struct cx18_card_audio_input *in;
26         u32 u, v;
27         int err;
28
29         /* Determine which input to use */
30         if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
31                 in = &cx->card->radio_input;
32         else
33                 in = &cx->card->audio_inputs[cx->audio_input];
34
35         /* handle muxer chips */
36         v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
37                          (u32) in->muxer_input, 0, 0);
38
39         err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
40                                audio, s_routing, in->audio_input, 0, 0);
41         if (err)
42                 return err;
43
44         /* FIXME - this internal mux should be abstracted to a subdev */
45         u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
46         v = u & ~CX18_AI1_MUX_MASK;
47         switch (in->audio_input) {
48         case CX18_AV_AUDIO_SERIAL1:
49                 v |= CX18_AI1_MUX_I2S1;
50                 break;
51         case CX18_AV_AUDIO_SERIAL2:
52                 v |= CX18_AI1_MUX_I2S2;
53                 break;
54         default:
55                 v |= CX18_AI1_MUX_843_I2S;
56                 break;
57         }
58         if (v == u) {
59                 /* force a toggle of some AI1 MUX control bits */
60                 u &= ~CX18_AI1_MUX_MASK;
61                 switch (in->audio_input) {
62                 case CX18_AV_AUDIO_SERIAL1:
63                         u |= CX18_AI1_MUX_843_I2S;
64                         break;
65                 case CX18_AV_AUDIO_SERIAL2:
66                         u |= CX18_AI1_MUX_843_I2S;
67                         break;
68                 default:
69                         u |= CX18_AI1_MUX_I2S1;
70                         break;
71                 }
72                 cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
73                                       u, CX18_AI1_MUX_MASK);
74         }
75         cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
76                               v, CX18_AI1_MUX_MASK);
77         return 0;
78 }