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hc
2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/sound/core/pcm_iec958.c
....@@ -1,9 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  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.
74  */
85 #include <linux/export.h>
96 #include <linux/types.h>
....@@ -12,41 +9,85 @@
129 #include <sound/pcm_params.h>
1310 #include <sound/pcm_iec958.h>
1411 
15
-static int create_iec958_consumer(uint rate, uint sample_width,
16
-				  u8 *cs, size_t len)
12
+/**
13
+ * snd_pcm_create_iec958_consumer_default - create default consumer format IEC958 channel status
14
+ * @cs: channel status buffer, at least four bytes
15
+ * @len: length of channel status buffer
16
+ *
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+ * Create the consumer format channel status data in @cs of maximum size
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+ * @len. When relevant, the configuration-dependant bits will be set as
19
+ * unspecified.
20
+ *
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+ * Drivers should then call einter snd_pcm_fill_iec958_consumer() or
22
+ * snd_pcm_fill_iec958_consumer_hw_params() to replace these unspecified
23
+ * bits by their actual values.
24
+ *
25
+ * Drivers may wish to tweak the contents of the buffer after creation.
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+ *
27
+ * Returns: length of buffer, or negative error code if something failed.
28
+ */
29
+int snd_pcm_create_iec958_consumer_default(u8 *cs, size_t len)
1730 {
18
-	unsigned int fs, ws;
19
-
2031 	if (len < 4)
2132 		return -EINVAL;
2233 
23
-	switch (rate) {
24
-	case 32000:
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-		fs = IEC958_AES3_CON_FS_32000;
26
-		break;
27
-	case 44100:
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-		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:
34
+	memset(cs, 0, len);
35
+
36
+	cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
37
+	cs[1] = IEC958_AES1_CON_GENERAL;
38
+	cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
39
+	cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | IEC958_AES3_CON_FS_NOTID;
40
+
41
+	if (len > 4)
42
+		cs[4] = IEC958_AES4_CON_WORDLEN_NOTID;
43
+
44
+	return len;
45
+}
46
+EXPORT_SYMBOL_GPL(snd_pcm_create_iec958_consumer_default);
47
+
48
+static int fill_iec958_consumer(uint rate, uint sample_width,
49
+				u8 *cs, size_t len)
50
+{
51
+	if (len < 4)
4652 		return -EINVAL;
53
+
54
+	if ((cs[3] & IEC958_AES3_CON_FS) == IEC958_AES3_CON_FS_NOTID) {
55
+		unsigned int fs;
56
+
57
+		switch (rate) {
58
+			case 32000:
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+				fs = IEC958_AES3_CON_FS_32000;
60
+				break;
61
+			case 44100:
62
+				fs = IEC958_AES3_CON_FS_44100;
63
+				break;
64
+			case 48000:
65
+				fs = IEC958_AES3_CON_FS_48000;
66
+				break;
67
+			case 88200:
68
+				fs = IEC958_AES3_CON_FS_88200;
69
+				break;
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+			case 96000:
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+				fs = IEC958_AES3_CON_FS_96000;
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+				break;
73
+			case 176400:
74
+				fs = IEC958_AES3_CON_FS_176400;
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+				break;
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+			case 192000:
77
+				fs = IEC958_AES3_CON_FS_192000;
78
+				break;
79
+			default:
80
+				return -EINVAL;
81
+		}
82
+
83
+		cs[3] &= ~IEC958_AES3_CON_FS;
84
+		cs[3] |= fs;
4785 	}
4886 
49
-	if (len > 4) {
87
+	if (len > 4 &&
88
+	    (cs[4] & IEC958_AES4_CON_WORDLEN) == IEC958_AES4_CON_WORDLEN_NOTID) {
89
+		unsigned int ws;
90
+
5091 		switch (sample_width) {
5192 		case 16:
5293 			ws = IEC958_AES4_CON_WORDLEN_20_16;
....@@ -67,20 +108,57 @@
67108 		default:
68109 			return -EINVAL;
69110 		}
111
+
112
+		cs[4] &= ~IEC958_AES4_CON_WORDLEN;
113
+		cs[4] |= ws;
70114 	}
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;
81115 
82116 	return len;
83117 }
118
+
119
+/**
120
+ * snd_pcm_fill_iec958_consumer - Fill consumer format IEC958 channel status
121
+ * @runtime: pcm runtime structure with ->rate filled in
122
+ * @cs: channel status buffer, at least four bytes
123
+ * @len: length of channel status buffer
124
+ *
125
+ * Fill the unspecified bits in an IEC958 status bits array using the
126
+ * parameters of the PCM runtime @runtime.
127
+ *
128
+ * Drivers may wish to tweak the contents of the buffer after its been
129
+ * filled.
130
+ *
131
+ * Returns: length of buffer, or negative error code if something failed.
132
+ */
133
+int snd_pcm_fill_iec958_consumer(struct snd_pcm_runtime *runtime,
134
+				 u8 *cs, size_t len)
135
+{
136
+	return fill_iec958_consumer(runtime->rate,
137
+				    snd_pcm_format_width(runtime->format),
138
+				    cs, len);
139
+}
140
+EXPORT_SYMBOL_GPL(snd_pcm_fill_iec958_consumer);
141
+
142
+/**
143
+ * snd_pcm_fill_iec958_consumer_hw_params - Fill consumer format IEC958 channel status
144
+ * @params: the hw_params instance for extracting rate and sample format
145
+ * @cs: channel status buffer, at least four bytes
146
+ * @len: length of channel status buffer
147
+ *
148
+ * Fill the unspecified bits in an IEC958 status bits array using the
149
+ * parameters of the PCM hardware parameters @params.
150
+ *
151
+ * Drivers may wish to tweak the contents of the buffer after its been
152
+ * filled..
153
+ *
154
+ * Returns: length of buffer, or negative error code if something failed.
155
+ */
156
+int snd_pcm_fill_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
157
+					   u8 *cs, size_t len)
158
+{
159
+	return fill_iec958_consumer(params_rate(params), params_width(params), cs, len);
160
+}
161
+EXPORT_SYMBOL_GPL(snd_pcm_fill_iec958_consumer_hw_params);
84162 
85163 /**
86164  * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
....@@ -98,15 +176,19 @@
98176 int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
99177 	size_t len)
100178 {
101
-	return create_iec958_consumer(runtime->rate,
102
-				      snd_pcm_format_width(runtime->format),
103
-				      cs, len);
179
+	int ret;
180
+
181
+	ret = snd_pcm_create_iec958_consumer_default(cs, len);
182
+	if (ret < 0)
183
+		return ret;
184
+
185
+	return snd_pcm_fill_iec958_consumer(runtime, cs, len);
104186 }
105187 EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
106188 
107189 /**
108190  * snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status
109
- * @hw_params: the hw_params instance for extracting rate and sample format
191
+ * @params: the hw_params instance for extracting rate and sample format
110192  * @cs: channel status buffer, at least four bytes
111193  * @len: length of channel status buffer
112194  *
....@@ -120,7 +202,12 @@
120202 int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
121203 					     u8 *cs, size_t len)
122204 {
123
-	return create_iec958_consumer(params_rate(params), params_width(params),
124
-				      cs, len);
205
+	int ret;
206
+
207
+	ret = snd_pcm_create_iec958_consumer_default(cs, len);
208
+	if (ret < 0)
209
+		return ret;
210
+
211
+	return fill_iec958_consumer(params_rate(params), params_width(params), cs, len);
125212 }
126213 EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);