drivers/i2c/busses/i2c-parport.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/* ------------------------------------------------------------------------ *
 * i2c-parport.h I2C bus over parallel port                                 *
 * ------------------------------------------------------------------------ *
   Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de>

 * ------------------------------------------------------------------------ */

#define PORT_DATA	0
#define PORT_STAT	1
#define PORT_CTRL	2

struct lineop {
	u8 val;
	u8 port;
	u8 inverted;
};

struct adapter_parm {
	struct lineop setsda;
	struct lineop setscl;
	struct lineop getsda;
	struct lineop getscl;
	struct lineop init;
	unsigned int smbus_alert:1;
};

static const struct adapter_parm adapter_parm[] = {
	/* type 0: Philips adapter */
	{
		.setsda	= { 0x80, PORT_DATA, 1 },
		.setscl	= { 0x08, PORT_CTRL, 0 },
		.getsda	= { 0x80, PORT_STAT, 0 },
		.getscl	= { 0x08, PORT_STAT, 0 },
	},
	/* type 1: home brew teletext adapter */
	{
		.setsda	= { 0x02, PORT_DATA, 0 },
		.setscl	= { 0x01, PORT_DATA, 0 },
		.getsda	= { 0x80, PORT_STAT, 1 },
	},
	/* type 2: Velleman K8000 adapter */
	{
		.setsda	= { 0x02, PORT_CTRL, 1 },
		.setscl	= { 0x08, PORT_CTRL, 1 },
		.getsda	= { 0x10, PORT_STAT, 0 },
	},
	/* type 3: ELV adapter */
	{
		.setsda	= { 0x02, PORT_DATA, 1 },
		.setscl	= { 0x01, PORT_DATA, 1 },
		.getsda	= { 0x40, PORT_STAT, 1 },
		.getscl	= { 0x08, PORT_STAT, 1 },
	},
	/* type 4: ADM1032 evaluation board */
	{
		.setsda	= { 0x02, PORT_DATA, 1 },
		.setscl	= { 0x01, PORT_DATA, 1 },
		.getsda	= { 0x10, PORT_STAT, 1 },
		.init	= { 0xf0, PORT_DATA, 0 },
		.smbus_alert = 1,
	},
	/* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */
	{
		.setsda	= { 0x02, PORT_DATA, 1 },
		.setscl	= { 0x01, PORT_DATA, 1 },
		.getsda	= { 0x10, PORT_STAT, 1 },
	},
	/* type 6: Barco LPT->DVI (K5800236) adapter */
	{
		.setsda	= { 0x02, PORT_DATA, 1 },
		.setscl	= { 0x01, PORT_DATA, 1 },
		.getsda	= { 0x20, PORT_STAT, 0 },
		.getscl	= { 0x40, PORT_STAT, 0 },
		.init	= { 0xfc, PORT_DATA, 0 },
	},
	/* type 7: One For All JP1 parallel port adapter */
	{
		.setsda	= { 0x01, PORT_DATA, 0 },
		.setscl	= { 0x02, PORT_DATA, 0 },
		.getsda	= { 0x80, PORT_STAT, 1 },
		.init	= { 0x04, PORT_DATA, 1 },
	},
	/* type 8: VCT-jig */
	{
		.setsda	= { 0x04, PORT_DATA, 1 },
		.setscl	= { 0x01, PORT_DATA, 1 },
		.getsda	= { 0x40, PORT_STAT, 0 },
		.getscl	= { 0x80, PORT_STAT, 1 },
	},
};

static int type = -1;
module_param(type, int, 0);
MODULE_PARM_DESC(type,
	"Type of adapter:\n"
	" 0 = Philips adapter\n"
	" 1 = home brew teletext adapter\n"
	" 2 = Velleman K8000 adapter\n"
	" 3 = ELV adapter\n"
	" 4 = ADM1032 evaluation board\n"
	" 5 = ADM1025, ADM1030 and ADM1031 evaluation boards\n"
	" 6 = Barco LPT->DVI (K5800236) adapter\n"
	" 7 = One For All JP1 parallel port adapter\n"
	" 8 = VCT-jig\n"
);