ALSA: firewire-motu: refactoring protocol v3 for clock source getter

This commit splits the method to get clock source for protocol
version 3 so that model-dependent operations are explicitly defined.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200519111641.123211-14-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/motu/motu-protocol-v3.c b/sound/firewire/motu/motu-protocol-v3.c
index cc100d7..fd49d1f 100644 (file)
--- a/sound/firewire/motu/motu-protocol-v3.c
+++ b/sound/firewire/motu/motu-protocol-v3.c
@@ -87,54 +87,100 @@ int snd_motu_protocol_v3_set_clock_rate(struct snd_motu *motu,
        return 0;
 }
 
-int snd_motu_protocol_v3_get_clock_source(struct snd_motu *motu,
-                                         enum snd_motu_clock_source *src)
+static int detect_clock_source_828mk3(struct snd_motu *motu, u32 data,
+                                     enum snd_motu_clock_source *src)
 {
-       __be32 reg;
-       u32 data;
-       unsigned int val;
-       int err;
-
-       err = snd_motu_transaction_read(motu, V3_CLOCK_STATUS_OFFSET, &reg,
-                                       sizeof(reg));
-       if (err < 0)
-               return err;
-       data = be32_to_cpu(reg);
-
-       val = data & V3_CLOCK_SOURCE_MASK;
-       if (val == 0x00) {
+       switch (data) {
+       case 0x00:
                *src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
-       } else if (val == 0x01) {
+               break;
+       case 0x01:
                *src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
-       } else if (val == 0x02) {
+               break;
+       case 0x02:
                *src = SND_MOTU_CLOCK_SOURCE_SPH;
-       } else if (val == 0x10) {
+               break;
+       case 0x10:
                *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
-       } else if (val == 0x18 || val == 0x19) {
-               err = snd_motu_transaction_read(motu, V3_OPT_IFACE_MODE_OFFSET,
-                                               &reg, sizeof(reg));
+               break;
+       case 0x18:
+       case 0x19:
+       {
+               __be32 reg;
+               u32 options;
+               int err;
+
+               err = snd_motu_transaction_read(motu,
+                               V3_OPT_IFACE_MODE_OFFSET, &reg, sizeof(reg));
                if (err < 0)
                        return err;
-               data = be32_to_cpu(reg);
+               options = be32_to_cpu(reg);
 
-               if (val == 0x18) {
-                       if (data & V3_NO_ADAT_OPT_IN_IFACE_A)
+               if (data == 0x18) {
+                       if (options & V3_NO_ADAT_OPT_IN_IFACE_A)
                                *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_OPT_A;
                        else
                                *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT_A;
                } else {
-                       if (data & V3_NO_ADAT_OPT_IN_IFACE_B)
+                       if (options & V3_NO_ADAT_OPT_IN_IFACE_B)
                                *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_OPT_B;
                        else
                                *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT_B;
                }
-       } else {
+
+               break;
+       }
+       default:
                *src = SND_MOTU_CLOCK_SOURCE_UNKNOWN;
+               break;
        }
 
        return 0;
 }
 
+static int v3_detect_clock_source(struct snd_motu *motu, u32 data,
+                                 enum snd_motu_clock_source *src)
+{
+       switch (data) {
+       case 0x00:
+               *src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
+               break;
+       case 0x01:
+               *src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
+               break;
+       case 0x02:
+               *src = SND_MOTU_CLOCK_SOURCE_SPH;
+               break;
+       case 0x10:
+               *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
+               break;
+       default:
+               *src = SND_MOTU_CLOCK_SOURCE_UNKNOWN;
+               break;
+       }
+
+       return 0;
+}
+
+int snd_motu_protocol_v3_get_clock_source(struct snd_motu *motu,
+                                         enum snd_motu_clock_source *src)
+{
+       __be32 reg;
+       u32 data;
+       int err;
+
+       err = snd_motu_transaction_read(motu, V3_CLOCK_STATUS_OFFSET, &reg,
+                                       sizeof(reg));
+       if (err < 0)
+               return err;
+       data = be32_to_cpu(reg) & V3_CLOCK_SOURCE_MASK;
+
+       if (motu->spec == &snd_motu_spec_828mk3)
+               return detect_clock_source_828mk3(motu, data, src);
+       else
+               return v3_detect_clock_source(motu, data, src);
+}
+
 int snd_motu_protocol_v3_switch_fetching_mode(struct snd_motu *motu,
                                              bool enable)
 {