ALSA: firewire-lib: move PCM substream constraint to AM824 layer

In IEC 61883-6, PCM frames are transferred in Multi Bit Linear Audio data
channel. The data channel transfers 16/20/24 bit PCM samples. Thus, PCM
substream has a constrain about it.

This commit moves codes related to the constraint from packet streaming
layer to AM824 data block processing layer.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

7 files changed, 29 insertions, 9 deletions

diff --git a/sound/firewire/amdtp-am824.c b/sound/firewire/amdtp-am824.c
index f5edcbfa3157..7adaba356579 100644
--- a/sound/firewire/amdtp-am824.c
+++ b/sound/firewire/amdtp-am824.c
@@ -53,6 +53,26 @@ int amdtp_am824_set_parameters(struct amdtp_stream *s, unsigned int rate,
 EXPORT_SYMBOL_GPL(amdtp_am824_set_parameters);
 
 /**
+ * amdtp_am824_add_pcm_hw_constraints - add hw constraints for PCM substream
+ * @s:          the AMDTP stream for AM824 data block, must be initialized.
+ * @runtime:    the PCM substream runtime
+ *
+ */
+int amdtp_am824_add_pcm_hw_constraints(struct amdtp_stream *s,
+                                       struct snd_pcm_runtime *runtime)
+{
+        int err;
+
+        err = amdtp_stream_add_pcm_hw_constraints(s, runtime);
+        if (err < 0)
+                return err;
+
+        /* AM824 in IEC 61883-6 can deliver 24bit data. */
+        return snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
+}
+EXPORT_SYMBOL_GPL(amdtp_am824_add_pcm_hw_constraints);
+
+/**
  * amdtp_am824_init - initialize an AMDTP stream structure to handle AM824
  *                    data block
  * @s: the AMDTP stream to initialize
diff --git a/sound/firewire/amdtp-am824.h b/sound/firewire/amdtp-am824.h
index cfc0d61e0db4..4aaed9048d82 100644
--- a/sound/firewire/amdtp-am824.h
+++ b/sound/firewire/amdtp-am824.h
@@ -1,6 +1,8 @@
 #ifndef SOUND_FIREWIRE_AMDTP_AM824_H_INCLUDED
 #define SOUND_FIREWIRE_AMDTP_AM824_H_INCLUDED
 
+#include <sound/pcm.h>
+
 #include "amdtp-stream.h"
 
 int amdtp_am824_set_parameters(struct amdtp_stream *s, unsigned int rate,
@@ -8,6 +10,9 @@ int amdtp_am824_set_parameters(struct amdtp_stream *s, unsigned int rate,
                                unsigned int midi_ports,
                                bool double_pcm_frames);
 
+int amdtp_am824_add_pcm_hw_constraints(struct amdtp_stream *s,
+                                       struct snd_pcm_runtime *runtime);
+
 int amdtp_am824_init(struct amdtp_stream *s, struct fw_unit *unit,
                      enum amdtp_stream_direction dir, enum cip_flags flags);
 #endif
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 53d84e9bf241..def4fb4b1cce 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -140,11 +140,6 @@ int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
 {
         int err;
 
-        /* AM824 in IEC 61883-6 can deliver 24bit data */
-        err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
-        if (err < 0)
-                goto end;
-
         /*
          * Currently firewire-lib processes 16 packets in one software
          * interrupt callback. This equals to 2msec but actually the
diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
index c0f018a61fdc..50610ca4b480 100644
--- a/sound/firewire/bebob/bebob_pcm.c
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -146,7 +146,7 @@ pcm_init_hw_params(struct snd_bebob *bebob,
         if (err < 0)
                 goto end;
 
-        err = amdtp_stream_add_pcm_hw_constraints(s, runtime);
+        err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
 end:
         return err;
 }
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 4e67b1da0fe6..f5f30079311f 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -156,7 +156,7 @@ static int init_hw_info(struct snd_dice *dice,
         if (err < 0)
                 goto end;
 
-        err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
+        err = amdtp_am824_add_pcm_hw_constraints(stream, runtime);
 end:
         return err;
 }
diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c
index c30b2ffa8dfb..f186ab70f429 100644
--- a/sound/firewire/fireworks/fireworks_pcm.c
+++ b/sound/firewire/fireworks/fireworks_pcm.c
@@ -187,7 +187,7 @@ pcm_init_hw_params(struct snd_efw *efw,
         if (err < 0)
                 goto end;
 
-        err = amdtp_stream_add_pcm_hw_constraints(s, runtime);
+        err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
 end:
         return err;
 }
diff --git a/sound/firewire/oxfw/oxfw-pcm.c b/sound/firewire/oxfw/oxfw-pcm.c
index 9c73930d0278..bddd28743a65 100644
--- a/sound/firewire/oxfw/oxfw-pcm.c
+++ b/sound/firewire/oxfw/oxfw-pcm.c
@@ -158,7 +158,7 @@ static int init_hw_params(struct snd_oxfw *oxfw,
         if (err < 0)
                 goto end;
 
-        err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
+        err = amdtp_am824_add_pcm_hw_constraints(stream, runtime);
 end:
         return err;
 }