ALSA: firewire-lib: Add some AV/C general commands

This commit adds three commands, which may be used by some firewire device
drivers. These commands are defined in 'AV/C Digital Interface Command Set
General Specification Version 4.2 (2004006, 1394TA)'.

1. PLUG INFO command (clause 10.1)
2. INPUT PLUG SIGNAL FORMAT command (clause 10.10)
3. OUTPUT PLUG SIGNAL FORMAT command (clause 10.11)

By the command 1, the drivers can get the number of plugs for AV/C unit or
subunit.
By the command 2 and 3, the drivers can get/set sampling frequency.

The 'firewire-speakers' already uses INPUT PLUG SIGNAL FORMAT command to set
sampling rate. So this commit also affects the driver.

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

1 files changed, 13 insertions, 11 deletions

diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 7c814ace9e58..5b8846123474 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -105,6 +105,17 @@ const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = {
 };
 EXPORT_SYMBOL(amdtp_syt_intervals);
 
+const unsigned int amdtp_rate_table[] = {
+        [CIP_SFC_32000]  =  32000,
+        [CIP_SFC_44100]  =  44100,
+        [CIP_SFC_48000]  =  48000,
+        [CIP_SFC_88200]  =  88200,
+        [CIP_SFC_96000]  =  96000,
+        [CIP_SFC_176400] = 176400,
+        [CIP_SFC_192000] = 192000,
+};
+EXPORT_SYMBOL(amdtp_rate_table);
+
 /**
  * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream
  * @s:          the AMDTP stream, which must be initialized.
@@ -176,15 +187,6 @@ void amdtp_stream_set_parameters(struct amdtp_stream *s,
                                  unsigned int pcm_channels,
                                  unsigned int midi_ports)
 {
-        static const unsigned int rates[] = {
-                [CIP_SFC_32000]  =  32000,
-                [CIP_SFC_44100]  =  44100,
-                [CIP_SFC_48000]  =  48000,
-                [CIP_SFC_88200]  =  88200,
-                [CIP_SFC_96000]  =  96000,
-                [CIP_SFC_176400] = 176400,
-                [CIP_SFC_192000] = 192000,
-        };
         unsigned int i, sfc, midi_channels;
 
         midi_channels = DIV_ROUND_UP(midi_ports, 8);
@@ -194,8 +196,8 @@ void amdtp_stream_set_parameters(struct amdtp_stream *s,
             WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI))
                 return;
 
-        for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc)
-                if (rates[sfc] == rate)
+        for (sfc = 0; sfc < sizeof(amdtp_rate_table); ++sfc)
+                if (amdtp_rate_table[sfc] == rate)
                         goto sfc_found;
         WARN_ON(1);
         return;