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ALSA: fireface: share helper function to switch fetching mode

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Both of Fireface 400/800 have the same register to switch frame fetching
mode regardless of difference of available number of PCM frames in
rx isochronous packet.

This commit moves a helper function from model-dependent implementation.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
2018-12-16 17:32:29 +09:00
committed by Takashi Iwai
parent 3d16200a3e
commit d4a0b6cbf2
3 changed files with 36 additions and 33 deletions
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30
sound/firewire/fireface/ff-protocol-ff400.c
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@@ -76,35 +76,6 @@ static void ff400_finish_session(struct snd_ff *ff)
FF400_ISOC_COMM_STOP, &reg, sizeof(reg), 0);
}
static int ff400_switch_fetching_mode(struct snd_ff *ff, bool enable)
{
__le32 *reg;
int i;
int err;
reg = kcalloc(18, sizeof(__le32), GFP_KERNEL);
if (reg == NULL)
return -ENOMEM;
if (!enable) {
/*
* Each quadlet is corresponding to data channels in a data
* blocks in reverse order. Precisely, quadlets for available
* data channels should be enabled. Here, I take second best
* to fetch PCM frames from all of data channels regardless of
* stf.
*/
for (i = 0; i < 18; ++i)
reg[i] = cpu_to_le32(0x00000001);
}
err = snd_fw_transaction(ff->unit, TCODE_WRITE_BLOCK_REQUEST,
SND_FF_REG_FETCH_PCM_FRAMES, reg,
sizeof(__le32) * 18, 0);
kfree(reg);
return err;
}
static void ff400_handle_midi_msg(struct snd_ff *ff, __le32 *buf, size_t length)
{
int i;
@@ -146,5 +117,4 @@ const struct snd_ff_protocol snd_ff_protocol_ff400 = {
.handle_midi_msg = ff400_handle_midi_msg,
.begin_session = ff400_begin_session,
.finish_session = ff400_finish_session,
.switch_fetching_mode = ff400_switch_fetching_mode,
};