diff options
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) { |