LATTER_FETCH_MODE, ®, sizeof(reg), 0);
}
-static int keep_resources(struct snd_ff *ff, unsigned int rate)
+static int latter_allocate_resources(struct snd_ff *ff, unsigned int rate)
{
enum snd_ff_stream_mode mode;
+ unsigned int code;
+ __le32 reg;
+ unsigned int count;
int i;
int err;
- // Check whether the given value is supported or not.
- for (i = 0; i < CIP_SFC_COUNT; i++) {
- if (amdtp_rate_table[i] == rate)
+ // Set the number of data blocks transferred in a second.
+ if (rate % 32000 == 0)
+ code = 0x00;
+ else if (rate % 44100 == 0)
+ code = 0x02;
+ else if (rate % 48000 == 0)
+ code = 0x04;
+ else
+ return -EINVAL;
+
+ if (rate >= 64000 && rate < 128000)
+ code |= 0x08;
+ else if (rate >= 128000 && rate < 192000)
+ code |= 0x10;
+
+ reg = cpu_to_le32(code);
+ err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
+ LATTER_STF, ®, sizeof(reg), 0);
+ if (err < 0)
+ return err;
+
+ // Confirm to shift transmission clock.
+ count = 0;
+ while (count++ < 10) {
+ unsigned int curr_rate;
+ enum snd_ff_clock_src src;
+
+ err = latter_get_clock(ff, &curr_rate, &src);
+ if (err < 0)
+ return err;
+
+ if (curr_rate == rate)
break;
}
- if (i >= CIP_SFC_COUNT)
+ if (count == 10)
+ return -ETIMEDOUT;
+
+ for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); ++i) {
+ if (rate == amdtp_rate_table[i])
+ break;
+ }
+ if (i == ARRAY_SIZE(amdtp_rate_table))
return -EINVAL;
err = snd_ff_stream_get_multiplier_mode(i, &mode);
if (err < 0)
return err;
- /* Keep resources for in-stream. */
+ // Keep resources for in-stream.
ff->tx_resources.channels_mask = 0x00000000000000ffuLL;
err = fw_iso_resources_allocate(&ff->tx_resources,
amdtp_stream_get_max_payload(&ff->tx_stream),
if (err < 0)
return err;
- /* Keep resources for out-stream. */
+ // Keep resources for out-stream.
ff->rx_resources.channels_mask = 0x00000000000000ffuLL;
err = fw_iso_resources_allocate(&ff->rx_resources,
amdtp_stream_get_max_payload(&ff->rx_stream),
static int latter_begin_session(struct snd_ff *ff, unsigned int rate)
{
- static const struct {
- unsigned int stf;
- unsigned int code;
- unsigned int flag;
- } *entry, rate_table[] = {
- { 32000, 0x00, 0x92, },
- { 44100, 0x02, 0x92, },
- { 48000, 0x04, 0x92, },
- { 64000, 0x08, 0x8e, },
- { 88200, 0x0a, 0x8e, },
- { 96000, 0x0c, 0x8e, },
- { 128000, 0x10, 0x8c, },
- { 176400, 0x12, 0x8c, },
- { 192000, 0x14, 0x8c, },
- };
+ unsigned int flag;
u32 data;
__le32 reg;
- unsigned int count;
- int i;
int err;
- for (i = 0; i < ARRAY_SIZE(rate_table); ++i) {
- entry = rate_table + i;
- if (entry->stf == rate)
- break;
- }
- if (i == ARRAY_SIZE(rate_table))
+ if (rate >= 32000 && rate <= 48000)
+ flag = 0x92;
+ else if (rate >= 64000 && rate <= 96000)
+ flag = 0x8e;
+ else if (rate >= 128000 && rate <= 192000)
+ flag = 0x8c;
+ else
return -EINVAL;
- reg = cpu_to_le32(entry->code);
- err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
- LATTER_STF, ®, sizeof(reg), 0);
- if (err < 0)
- return err;
-
- // Confirm to shift transmission clock.
- count = 0;
- while (count++ < 10) {
- unsigned int curr_rate;
- enum snd_ff_clock_src src;
-
- err = latter_get_clock(ff, &curr_rate, &src);
- if (err < 0)
- return err;
-
- if (curr_rate == rate)
- break;
- }
- if (count == 10)
- return -ETIMEDOUT;
-
- err = keep_resources(ff, rate);
- if (err < 0)
- return err;
-
data = (ff->tx_resources.channel << 8) | ff->rx_resources.channel;
reg = cpu_to_le32(data);
err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
// Always use the maximum number of data channels in data block of
// packet.
- reg = cpu_to_le32(entry->flag);
+ reg = cpu_to_le32(flag);
return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
LATTER_ISOC_START, ®, sizeof(reg), 0);
}
.fill_midi_msg = latter_fill_midi_msg,
.get_clock = latter_get_clock,
.switch_fetching_mode = latter_switch_fetching_mode,
+ .allocate_resources = latter_allocate_resources,
.begin_session = latter_begin_session,
.finish_session = latter_finish_session,
.dump_status = latter_dump_status,