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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * PCM DRM helpers
4 */
5#include <linux/export.h>
6#include <linux/types.h>
7#include <sound/asoundef.h>
8#include <sound/pcm.h>
9#include <sound/pcm_params.h>
10#include <sound/pcm_iec958.h>
11
12static int create_iec958_consumer(uint rate, uint sample_width,
13 u8 *cs, size_t len)
14{
15 unsigned int fs, ws;
16
17 if (len < 4)
18 return -EINVAL;
19
20 switch (rate) {
21 case 32000:
22 fs = IEC958_AES3_CON_FS_32000;
23 break;
24 case 44100:
25 fs = IEC958_AES3_CON_FS_44100;
26 break;
27 case 48000:
28 fs = IEC958_AES3_CON_FS_48000;
29 break;
30 case 88200:
31 fs = IEC958_AES3_CON_FS_88200;
32 break;
33 case 96000:
34 fs = IEC958_AES3_CON_FS_96000;
35 break;
36 case 176400:
37 fs = IEC958_AES3_CON_FS_176400;
38 break;
39 case 192000:
40 fs = IEC958_AES3_CON_FS_192000;
41 break;
42 default:
43 return -EINVAL;
44 }
45
46 if (len > 4) {
47 switch (sample_width) {
48 case 16:
49 ws = IEC958_AES4_CON_WORDLEN_20_16;
50 break;
51 case 18:
52 ws = IEC958_AES4_CON_WORDLEN_22_18;
53 break;
54 case 20:
55 ws = IEC958_AES4_CON_WORDLEN_20_16 |
56 IEC958_AES4_CON_MAX_WORDLEN_24;
57 break;
58 case 24:
59 case 32: /* Assume 24-bit width for 32-bit samples. */
60 ws = IEC958_AES4_CON_WORDLEN_24_20 |
61 IEC958_AES4_CON_MAX_WORDLEN_24;
62 break;
63
64 default:
65 return -EINVAL;
66 }
67 }
68
69 memset(cs, 0, len);
70
71 cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
72 cs[1] = IEC958_AES1_CON_GENERAL;
73 cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
74 cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs;
75
76 if (len > 4)
77 cs[4] = ws;
78
79 return len;
80}
81
82/**
83 * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
84 * @runtime: pcm runtime structure with ->rate filled in
85 * @cs: channel status buffer, at least four bytes
86 * @len: length of channel status buffer
87 *
88 * Create the consumer format channel status data in @cs of maximum size
89 * @len corresponding to the parameters of the PCM runtime @runtime.
90 *
91 * Drivers may wish to tweak the contents of the buffer after creation.
92 *
93 * Returns: length of buffer, or negative error code if something failed.
94 */
95int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
96 size_t len)
97{
98 return create_iec958_consumer(runtime->rate,
99 snd_pcm_format_width(runtime->format),
100 cs, len);
101}
102EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
103
104/**
105 * snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status
106 * @hw_params: the hw_params instance for extracting rate and sample format
107 * @cs: channel status buffer, at least four bytes
108 * @len: length of channel status buffer
109 *
110 * Create the consumer format channel status data in @cs of maximum size
111 * @len corresponding to the parameters of the PCM runtime @runtime.
112 *
113 * Drivers may wish to tweak the contents of the buffer after creation.
114 *
115 * Returns: length of buffer, or negative error code if something failed.
116 */
117int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
118 u8 *cs, size_t len)
119{
120 return create_iec958_consumer(params_rate(params), params_width(params),
121 cs, len);
122}
123EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);
1/*
2 * PCM DRM helpers
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#include <linux/export.h>
9#include <linux/types.h>
10#include <sound/asoundef.h>
11#include <sound/pcm.h>
12#include <sound/pcm_params.h>
13#include <sound/pcm_iec958.h>
14
15static int create_iec958_consumer(uint rate, uint sample_width,
16 u8 *cs, size_t len)
17{
18 unsigned int fs, ws;
19
20 if (len < 4)
21 return -EINVAL;
22
23 switch (rate) {
24 case 32000:
25 fs = IEC958_AES3_CON_FS_32000;
26 break;
27 case 44100:
28 fs = IEC958_AES3_CON_FS_44100;
29 break;
30 case 48000:
31 fs = IEC958_AES3_CON_FS_48000;
32 break;
33 case 88200:
34 fs = IEC958_AES3_CON_FS_88200;
35 break;
36 case 96000:
37 fs = IEC958_AES3_CON_FS_96000;
38 break;
39 case 176400:
40 fs = IEC958_AES3_CON_FS_176400;
41 break;
42 case 192000:
43 fs = IEC958_AES3_CON_FS_192000;
44 break;
45 default:
46 return -EINVAL;
47 }
48
49 if (len > 4) {
50 switch (sample_width) {
51 case 16:
52 ws = IEC958_AES4_CON_WORDLEN_20_16;
53 break;
54 case 18:
55 ws = IEC958_AES4_CON_WORDLEN_22_18;
56 break;
57 case 20:
58 ws = IEC958_AES4_CON_WORDLEN_20_16 |
59 IEC958_AES4_CON_MAX_WORDLEN_24;
60 break;
61 case 24:
62 case 32: /* Assume 24-bit width for 32-bit samples. */
63 ws = IEC958_AES4_CON_WORDLEN_24_20 |
64 IEC958_AES4_CON_MAX_WORDLEN_24;
65 break;
66
67 default:
68 return -EINVAL;
69 }
70 }
71
72 memset(cs, 0, len);
73
74 cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
75 cs[1] = IEC958_AES1_CON_GENERAL;
76 cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
77 cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs;
78
79 if (len > 4)
80 cs[4] = ws;
81
82 return len;
83}
84
85/**
86 * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
87 * @runtime: pcm runtime structure with ->rate filled in
88 * @cs: channel status buffer, at least four bytes
89 * @len: length of channel status buffer
90 *
91 * Create the consumer format channel status data in @cs of maximum size
92 * @len corresponding to the parameters of the PCM runtime @runtime.
93 *
94 * Drivers may wish to tweak the contents of the buffer after creation.
95 *
96 * Returns: length of buffer, or negative error code if something failed.
97 */
98int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
99 size_t len)
100{
101 return create_iec958_consumer(runtime->rate,
102 snd_pcm_format_width(runtime->format),
103 cs, len);
104}
105EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
106
107/**
108 * snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status
109 * @hw_params: the hw_params instance for extracting rate and sample format
110 * @cs: channel status buffer, at least four bytes
111 * @len: length of channel status buffer
112 *
113 * Create the consumer format channel status data in @cs of maximum size
114 * @len corresponding to the parameters of the PCM runtime @runtime.
115 *
116 * Drivers may wish to tweak the contents of the buffer after creation.
117 *
118 * Returns: length of buffer, or negative error code if something failed.
119 */
120int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
121 u8 *cs, size_t len)
122{
123 return create_iec958_consumer(params_rate(params), params_width(params),
124 cs, len);
125}
126EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);