Commit 75be43d9 authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
Browse files

ALSA: fireface: support allocate_resources operation in ff400 protocol 



This commit is a part of preparation to perform allocation/release
of isochronous channels in pcm.hw_params/hw_free callbacks.

This commit implements allocate_resources callback for ff400 protocol.
In this callback, sampling transfer frequency is configured to the
device as well.

Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ca8159a8

sound/firewire/fireface/ff-protocol-former.c

+16 −20
Original line number Diff line number Diff line
@@ -429,12 +429,11 @@ const struct snd_ff_protocol snd_ff_protocol_ff800 = { 
#define FF400_TX_PACKET_FORMAT	0x00008010050cull

#define FF400_ISOC_COMM_STOP	0x000080100510ull



/*

 * Fireface 400 manages isochronous channel number in 3 bit field. Therefore,

 * we can allocate between 0 and 7 channel.

 */

static int keep_resources(struct snd_ff *ff, unsigned int rate)

// Fireface 400 manages isochronous channel number in 3 bit field. Therefore,

// we can allocate between 0 and 7 channel.

static int ff400_allocate_resources(struct snd_ff *ff, unsigned int rate)

{

	__le32 reg;

	enum snd_ff_stream_mode mode;

	int i;

	int err;
@@ -447,11 +446,20 @@ static int keep_resources(struct snd_ff *ff, unsigned int rate) 
	if (i >= CIP_SFC_COUNT)

		return -EINVAL;



	// Set the number of data blocks transferred in a second.

	reg = cpu_to_le32(rate);

	err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,

				 FF400_STF, &reg, sizeof(reg), 0);

	if (err < 0)

		return err;



	msleep(100);



	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),
@@ -459,7 +467,7 @@ static int keep_resources(struct snd_ff *ff, unsigned int rate) 
	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),
@@ -475,19 +483,6 @@ static int ff400_begin_session(struct snd_ff *ff, unsigned int rate) 
	__le32 reg;

	int err;



	err = keep_resources(ff, rate);

	if (err < 0)

		return err;



	/* Set the number of data blocks transferred in a second. */

	reg = cpu_to_le32(rate);

	err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,

				 FF400_STF, &reg, sizeof(reg), 0);

	if (err < 0)

		return err;



	msleep(100);



	/*

	 * Set isochronous channel and the number of quadlets of received

	 * packets.
@@ -589,6 +584,7 @@ const struct snd_ff_protocol snd_ff_protocol_ff400 = { 
	.fill_midi_msg		= former_fill_midi_msg,

	.get_clock		= former_get_clock,

	.switch_fetching_mode	= former_switch_fetching_mode,

	.allocate_resources	= ff400_allocate_resources,

	.begin_session		= ff400_begin_session,

	.finish_session		= ff400_finish_session,

	.dump_status		= former_dump_status,

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