1 files changed, 95 insertions, 0 deletions

diff --git a/sound/core/pcm_iec958.c b/sound/core/pcm_iec958.c
new file mode 100644
index 000000000000..36b2d7aca1bd
--- /dev/null
+++ b/sound/core/pcm_iec958.c
@@ -0,0 +1,95 @@
+/*
+ *  PCM DRM helpers
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License version 2 as
+ *   published by the Free Software Foundation.
+ */
+#include <linux/export.h>
+#include <linux/types.h>
+#include <sound/asoundef.h>
+#include <sound/pcm.h>
+#include <sound/pcm_iec958.h>
+
+/**
+ * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
+ * @runtime: pcm runtime structure with ->rate filled in
+ * @cs: channel status buffer, at least four bytes
+ * @len: length of channel status buffer
+ *
+ * Create the consumer format channel status data in @cs of maximum size
+ * @len corresponding to the parameters of the PCM runtime @runtime.
+ *
+ * Drivers may wish to tweak the contents of the buffer after creation.
+ *
+ * Returns: length of buffer, or negative error code if something failed.
+ */
+int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
+        size_t len)
+{
+        unsigned int fs, ws;
+
+        if (len < 4)
+                return -EINVAL;
+
+        switch (runtime->rate) {
+        case 32000:
+                fs = IEC958_AES3_CON_FS_32000;
+                break;
+        case 44100:
+                fs = IEC958_AES3_CON_FS_44100;
+                break;
+        case 48000:
+                fs = IEC958_AES3_CON_FS_48000;
+                break;
+        case 88200:
+                fs = IEC958_AES3_CON_FS_88200;
+                break;
+        case 96000:
+                fs = IEC958_AES3_CON_FS_96000;
+                break;
+        case 176400:
+                fs = IEC958_AES3_CON_FS_176400;
+                break;
+        case 192000:
+                fs = IEC958_AES3_CON_FS_192000;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (len > 4) {
+                switch (snd_pcm_format_width(runtime->format)) {
+                case 16:
+                        ws = IEC958_AES4_CON_WORDLEN_20_16;
+                        break;
+                case 18:
+                        ws = IEC958_AES4_CON_WORDLEN_22_18;
+                        break;
+                case 20:
+                        ws = IEC958_AES4_CON_WORDLEN_20_16 |
+                             IEC958_AES4_CON_MAX_WORDLEN_24;
+                        break;
+                case 24:
+                        ws = IEC958_AES4_CON_WORDLEN_24_20 |
+                             IEC958_AES4_CON_MAX_WORDLEN_24;
+                        break;
+
+                default:
+                        return -EINVAL;
+                }
+        }
+
+        memset(cs, 0, len);
+
+        cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
+        cs[1] = IEC958_AES1_CON_GENERAL;
+        cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
+        cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs;
+
+        if (len > 4)
+                cs[4] = ws;
+
+        return len;
+}
+EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);