ALSA: pcm: add IEC958 channel status helper for hw_params

Add IEC958 channel status helper that gets the audio properties from
snd_pcm_hw_params instead of snd_pcm_runtime. This is needed to
produce the channel status bits already in audio stream configuration
phase.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/pcm_iec958.h b/include/sound/pcm_iec958.h
index 0eed397..36f023a 100644 (file)
--- a/include/sound/pcm_iec958.h
+++ b/include/sound/pcm_iec958.h
@@ -6,4 +6,6 @@
 int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
        size_t len);
 
+int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
+                                            u8 *cs, size_t len);
 #endif

diff --git a/sound/core/pcm_iec958.c b/sound/core/pcm_iec958.c
index 36b2d7a..e016871 100644 (file)
--- a/sound/core/pcm_iec958.c
+++ b/sound/core/pcm_iec958.c
@@ -9,30 +9,18 @@
 #include <linux/types.h>
 #include <sound/asoundef.h>
 #include <sound/pcm.h>
+#include <sound/pcm_params.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)
+static int create_iec958_consumer(uint rate, uint sample_width,
+                                 u8 *cs, size_t len)
 {
        unsigned int fs, ws;
 
        if (len < 4)
                return -EINVAL;
 
-       switch (runtime->rate) {
+       switch (rate) {
        case 32000:
                fs = IEC958_AES3_CON_FS_32000;
                break;
@@ -59,7 +47,7 @@ int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
        }
 
        if (len > 4) {
-               switch (snd_pcm_format_width(runtime->format)) {
+               switch (sample_width) {
                case 16:
                        ws = IEC958_AES4_CON_WORDLEN_20_16;
                        break;
@@ -92,4 +80,46 @@ int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
 
        return len;
 }
+
+/**
+ * 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)
+{
+       return create_iec958_consumer(runtime->rate,
+                                     snd_pcm_format_width(runtime->format),
+                                     cs, len);
+}
 EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
+
+/**
+ * snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status
+ * @hw_params: the hw_params instance for extracting rate and sample format
+ * @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_hw_params(struct snd_pcm_hw_params *params,
+                                            u8 *cs, size_t len)
+{
+       return create_iec958_consumer(params_rate(params), params_width(params),
+                                     cs, len);
+}
+EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);