diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2018-12-11 19:17:30 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-12-11 14:56:20 +0100 |
| commit | 3c3b892b3735edcc9e0be0aa129c72613e3f156e (patch) | |
| tree | 1cec4e0a5d49534d57c30f3d9788125966e75228 /sound/firewire/fireface/ff-transaction.c | |
| parent | 72f10f08b6e95cfeb7cad9ebd165d5cca771e0e7 (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.c | 59 |
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, ®, 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) { |