Commit 5b59d809 authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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ALSA: oxfw: Add support for AV/C stream format command to get/set supported stream formation 



OXFW970/971 may supports AV/C Stream Format Information Specification 1.1
Working Draft (Apr 2005, 1394TA). By using this command, drivers can get to know
stream formations which device supports.

This commit adds 'EXTENDED STREAM FORMAT INFORMATION' command. This command
has two subfunctions, 'SINGLE' and 'LIST'. Drivers can use 'SINGLE' subfunction
to know/set current formation of AMDTP stream, Drivers can use 'LIST'
subfunction to know an available formation of AMDTP stream in a certain sampling
rate.

But some devices don't implement the 'LIST' subfunction. So this commit uses
an assumption that 'if they don't implement it, they don't change stream
formation depending on current each sampling rate'. With this assumption, this
driver generates formations for such devices by:
 1.getting current formation by SINGLE subfunction
 2.getting supported sampling rates
 3.applying current formation for all of supported sampling rates

Followed commit implements a parser of this format information.

Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent fec7b753

sound/firewire/oxfw/Makefile

+1 −1
Original line number Diff line number Diff line 
snd-oxfw-objs := oxfw-stream.o oxfw-control.o oxfw-pcm.o oxfw.o

snd-oxfw-objs := oxfw-command.o oxfw-stream.o oxfw-control.o oxfw-pcm.o oxfw.o

obj-m += snd-oxfw.o

sound/firewire/oxfw/oxfw-command.c

0 → 100644
+153 −0
Original line number Diff line number Diff line 
/*

 * oxfw_command.c - a part of driver for OXFW970/971 based devices

 *

 * Copyright (c) 2014 Takashi Sakamoto

 *

 * Licensed under the terms of the GNU General Public License, version 2.

 */



#include "oxfw.h"



int avc_stream_set_format(struct fw_unit *unit, enum avc_general_plug_dir dir,

			  unsigned int pid, u8 *format, unsigned int len)

{

	u8 *buf;

	int err;



	buf = kmalloc(len + 10, GFP_KERNEL);

	if (buf == NULL)

		return -ENOMEM;



	buf[0] = 0x00;		/* CONTROL */

	buf[1] = 0xff;		/* UNIT */

	buf[2] = 0xbf;		/* EXTENDED STREAM FORMAT INFORMATION */

	buf[3] = 0xc0;		/* SINGLE subfunction */

	buf[4] = dir;		/* Plug Direction */

	buf[5] = 0x00;		/* UNIT */

	buf[6] = 0x00;		/* PCR (Isochronous Plug) */

	buf[7] = 0xff & pid;	/* Plug ID */

	buf[8] = 0xff;		/* Padding */

	buf[9] = 0xff;		/* Support status in response */

	memcpy(buf + 10, format, len);



	/* do transaction and check buf[1-8] are the same against command */

	err = fcp_avc_transaction(unit, buf, len + 10, buf, len + 10,

				  BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |

				  BIT(6) | BIT(7) | BIT(8));

	if ((err > 0) && (err < len + 10))

		err = -EIO;

	else if (buf[0] == 0x08) /* NOT IMPLEMENTED */

		err = -ENOSYS;

	else if (buf[0] == 0x0a) /* REJECTED */

		err = -EINVAL;

	else

		err = 0;



	kfree(buf);



	return err;

}



int avc_stream_get_format(struct fw_unit *unit,

			  enum avc_general_plug_dir dir, unsigned int pid,

			  u8 *buf, unsigned int *len, unsigned int eid)

{

	unsigned int subfunc;

	int err;



	if (eid == 0xff)

		subfunc = 0xc0;	/* SINGLE */

	else

		subfunc = 0xc1;	/* LIST */



	buf[0] = 0x01;		/* STATUS */

	buf[1] = 0xff;		/* UNIT */

	buf[2] = 0xbf;		/* EXTENDED STREAM FORMAT INFORMATION */

	buf[3] = subfunc;	/* SINGLE or LIST */

	buf[4] = dir;		/* Plug Direction */

	buf[5] = 0x00;		/* Unit */

	buf[6] = 0x00;		/* PCR (Isochronous Plug) */

	buf[7] = 0xff & pid;	/* Plug ID */

	buf[8] = 0xff;		/* Padding */

	buf[9] = 0xff;		/* support status in response */

	buf[10] = 0xff & eid;	/* entry ID for LIST subfunction */

	buf[11] = 0xff;		/* padding */



	/* do transaction and check buf[1-7] are the same against command */

	err = fcp_avc_transaction(unit, buf, 12, buf, *len,

				  BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |

				  BIT(6) | BIT(7));

	if ((err > 0) && (err < 10))

		err = -EIO;

	else if (buf[0] == 0x08)	/* NOT IMPLEMENTED */

		err = -ENOSYS;

	else if (buf[0] == 0x0a)	/* REJECTED */

		err = -EINVAL;

	else if (buf[0] == 0x0b)	/* IN TRANSITION */

		err = -EAGAIN;

	/* LIST subfunction has entry ID */

	else if ((subfunc == 0xc1) && (buf[10] != eid))

		err = -EIO;

	if (err < 0)

		goto end;



	/* keep just stream format information */

	if (subfunc == 0xc0) {

		memmove(buf, buf + 10, err - 10);

		*len = err - 10;

	} else {

		memmove(buf, buf + 11, err - 11);

		*len = err - 11;

	}



	err = 0;

end:

	return err;

}



int avc_general_inquiry_sig_fmt(struct fw_unit *unit, unsigned int rate,

				enum avc_general_plug_dir dir,

				unsigned short pid)

{

	unsigned int sfc;

	u8 *buf;

	int err;



	for (sfc = 0; sfc < CIP_SFC_COUNT; sfc++) {

		if (amdtp_rate_table[sfc] == rate)

			break;

	}

	if (sfc == CIP_SFC_COUNT)

		return -EINVAL;



	buf = kzalloc(8, GFP_KERNEL);

	if (buf == NULL)

		return -ENOMEM;



	buf[0] = 0x02;		/* SPECIFIC INQUIRY */

	buf[1] = 0xff;		/* UNIT */

	if (dir == AVC_GENERAL_PLUG_DIR_IN)

		buf[2] = 0x19;	/* INPUT PLUG SIGNAL FORMAT */

	else

		buf[2] = 0x18;	/* OUTPUT PLUG SIGNAL FORMAT */

	buf[3] = 0xff & pid;	/* plug id */

	buf[4] = 0x90;		/* EOH_1, Form_1, FMT. AM824 */

	buf[5] = 0x07 & sfc;	/* FDF-hi. AM824, frequency */

	buf[6] = 0xff;		/* FDF-mid. AM824, SYT hi (not used) */

	buf[7] = 0xff;		/* FDF-low. AM824, SYT lo (not used) */



	/* do transaction and check buf[1-5] are the same against command */

	err = fcp_avc_transaction(unit, buf, 8, buf, 8,

				  BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5));

	if ((err > 0) && (err < 8))

		err = -EIO;

	else if (buf[0] == 0x08)	/* NOT IMPLEMENTED */

		err = -ENOSYS;

	if (err < 0)

		goto end;



	err = 0;

end:

	kfree(buf);

	return err;

}

sound/firewire/oxfw/oxfw.h

+33 −0
Original line number Diff line number Diff line
@@ -49,6 +49,39 @@ struct snd_oxfw { 
	s16 volume_max;

};



/*

 * AV/C Stream Format Information Specification 1.1 Working Draft

 * (Apr 2005, 1394TA)

 */

int avc_stream_set_format(struct fw_unit *unit, enum avc_general_plug_dir dir,

			  unsigned int pid, u8 *format, unsigned int len);

int avc_stream_get_format(struct fw_unit *unit,

			  enum avc_general_plug_dir dir, unsigned int pid,

			  u8 *buf, unsigned int *len, unsigned int eid);

static inline int

avc_stream_get_format_single(struct fw_unit *unit,

			     enum avc_general_plug_dir dir, unsigned int pid,

			     u8 *buf, unsigned int *len)

{

	return avc_stream_get_format(unit, dir, pid, buf, len, 0xff);

}

static inline int

avc_stream_get_format_list(struct fw_unit *unit,

			   enum avc_general_plug_dir dir, unsigned int pid,

			   u8 *buf, unsigned int *len,

			   unsigned int eid)

{

	return avc_stream_get_format(unit, dir, pid, buf, len, eid);

}



/*

 * AV/C Digital Interface Command Set General Specification 4.2

 * (Sep 2004, 1394TA)

 */

int avc_general_inquiry_sig_fmt(struct fw_unit *unit, unsigned int rate,

				enum avc_general_plug_dir dir,

				unsigned short pid);



int snd_oxfw_stream_init_simplex(struct snd_oxfw *oxfw);

int snd_oxfw_stream_start_simplex(struct snd_oxfw *oxfw);

void snd_oxfw_stream_stop_simplex(struct snd_oxfw *oxfw);

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