linux/drivers/i2c/busses/i2c-parport.h
Mark M. Hoffman e97b81ddbb [PATCH] i2c-parport: Make type parameter mandatory
This patch forces the user to specify what type of adapter is present when
loading i2c-parport or i2c-parport-light.  If none is specified, the driver
init simply fails - instead of assuming adapter type 0.

This alleviates the sometimes lengthy boot time delays which can be caused
by accidentally building one of these into a kernel along with several i2c
slave drivers that have lengthy probe routines (e.g. hwmon drivers).

Kconfig and documentation updated accordingly.

Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-04-14 11:18:34 -07:00

105 lines
2.8 KiB
C

/* ------------------------------------------------------------------------ *
* i2c-parport.h I2C bus over parallel port *
* ------------------------------------------------------------------------ *
Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* ------------------------------------------------------------------------ */
#ifdef DATA
#undef DATA
#endif
#define DATA 0
#define STAT 1
#define 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;
};
static struct adapter_parm adapter_parm[] = {
/* type 0: Philips adapter */
{
.setsda = { 0x80, DATA, 1 },
.setscl = { 0x08, CTRL, 0 },
.getsda = { 0x80, STAT, 0 },
.getscl = { 0x08, STAT, 0 },
},
/* type 1: home brew teletext adapter */
{
.setsda = { 0x02, DATA, 0 },
.setscl = { 0x01, DATA, 0 },
.getsda = { 0x80, STAT, 1 },
},
/* type 2: Velleman K8000 adapter */
{
.setsda = { 0x02, CTRL, 1 },
.setscl = { 0x08, CTRL, 1 },
.getsda = { 0x10, STAT, 0 },
},
/* type 3: ELV adapter */
{
.setsda = { 0x02, DATA, 1 },
.setscl = { 0x01, DATA, 1 },
.getsda = { 0x40, STAT, 1 },
.getscl = { 0x08, STAT, 1 },
},
/* type 4: ADM1032 evaluation board */
{
.setsda = { 0x02, DATA, 1 },
.setscl = { 0x01, DATA, 1 },
.getsda = { 0x10, STAT, 1 },
.init = { 0xf0, DATA, 0 },
},
/* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */
{
.setsda = { 0x02, DATA, 1 },
.setscl = { 0x01, DATA, 1 },
.getsda = { 0x10, STAT, 1 },
},
/* type 6: Barco LPT->DVI (K5800236) adapter */
{
.setsda = { 0x02, DATA, 1 },
.setscl = { 0x01, DATA, 1 },
.getsda = { 0x20, STAT, 0 },
.getscl = { 0x40, STAT, 0 },
.init = { 0xfc, DATA, 0 },
},
};
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"
);