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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2018-12-11 19:17:30 +0900
committerTakashi Iwai <tiwai@suse.de>2018-12-11 14:56:20 +0100
commit3c3b892b3735edcc9e0be0aa129c72613e3f156e (patch)
tree1cec4e0a5d49534d57c30f3d9788125966e75228 /sound/firewire/fireface/ff-transaction.c
parent72f10f08b6e95cfeb7cad9ebd165d5cca771e0e7 (diff)
ALSA: fireface: share helper function to get current sampling rate and clock source
As long as investigating packet dumps from Fireface 400/800, bits on status registers for clock synchronization are the same. This commit moves a parser for a register of clock configuration to obsolete model-specific operations. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/fireface/ff-transaction.c')
-rw-r--r--sound/firewire/fireface/ff-transaction.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/sound/firewire/fireface/ff-transaction.c b/sound/firewire/fireface/ff-transaction.c
index 332b29f8ed75..1dad51da13e0 100644
--- a/sound/firewire/fireface/ff-transaction.c
+++ b/sound/firewire/fireface/ff-transaction.c
@@ -8,6 +8,65 @@
#include "ff.h"
+int snd_ff_transaction_get_clock(struct snd_ff *ff, unsigned int *rate,
+ enum snd_ff_clock_src *src)
+{
+ __le32 reg;
+ u32 data;
+ int err;
+
+ err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST,
+ SND_FF_REG_CLOCK_CONFIG, &reg, sizeof(reg), 0);
+ if (err < 0)
+ return err;
+ data = le32_to_cpu(reg);
+
+ /* Calculate sampling rate. */
+ switch ((data >> 1) & 0x03) {
+ case 0x01:
+ *rate = 32000;
+ break;
+ case 0x00:
+ *rate = 44100;
+ break;
+ case 0x03:
+ *rate = 48000;
+ break;
+ case 0x02:
+ default:
+ return -EIO;
+ }
+
+ if (data & 0x08)
+ *rate *= 2;
+ else if (data & 0x10)
+ *rate *= 4;
+
+ /* Calculate source of clock. */
+ if (data & 0x01) {
+ *src = SND_FF_CLOCK_SRC_INTERNAL;
+ } else {
+ /* TODO: 0x00, 0x01, 0x02, 0x06, 0x07? */
+ switch ((data >> 10) & 0x07) {
+ case 0x03:
+ *src = SND_FF_CLOCK_SRC_SPDIF;
+ break;
+ case 0x04:
+ *src = SND_FF_CLOCK_SRC_WORD;
+ break;
+ case 0x05:
+ *src = SND_FF_CLOCK_SRC_LTC;
+ break;
+ case 0x00:
+ default:
+ *src = SND_FF_CLOCK_SRC_ADAT;
+ break;
+ }
+ }
+
+ return 0;
+}
+
static void finish_transmit_midi_msg(struct snd_ff *ff, unsigned int port,
int rcode)
{