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e97b81ddbb
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>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/* ------------------------------------------------------------------------ *
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* i2c-parport.h I2C bus over parallel port *
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* ------------------------------------------------------------------------ *
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Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* ------------------------------------------------------------------------ */
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#ifdef DATA
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#undef DATA
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#endif
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#define DATA 0
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#define STAT 1
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#define CTRL 2
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struct lineop {
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u8 val;
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u8 port;
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u8 inverted;
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};
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struct adapter_parm {
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struct lineop setsda;
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struct lineop setscl;
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struct lineop getsda;
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struct lineop getscl;
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struct lineop init;
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};
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static struct adapter_parm adapter_parm[] = {
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/* type 0: Philips adapter */
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{
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.setsda = { 0x80, DATA, 1 },
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.setscl = { 0x08, CTRL, 0 },
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.getsda = { 0x80, STAT, 0 },
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.getscl = { 0x08, STAT, 0 },
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},
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/* type 1: home brew teletext adapter */
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{
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.setsda = { 0x02, DATA, 0 },
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.setscl = { 0x01, DATA, 0 },
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.getsda = { 0x80, STAT, 1 },
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},
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/* type 2: Velleman K8000 adapter */
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{
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.setsda = { 0x02, CTRL, 1 },
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.setscl = { 0x08, CTRL, 1 },
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.getsda = { 0x10, STAT, 0 },
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},
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/* type 3: ELV adapter */
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{
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.setsda = { 0x02, DATA, 1 },
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.setscl = { 0x01, DATA, 1 },
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.getsda = { 0x40, STAT, 1 },
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.getscl = { 0x08, STAT, 1 },
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},
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/* type 4: ADM1032 evaluation board */
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{
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.setsda = { 0x02, DATA, 1 },
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.setscl = { 0x01, DATA, 1 },
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.getsda = { 0x10, STAT, 1 },
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.init = { 0xf0, DATA, 0 },
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},
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/* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */
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{
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.setsda = { 0x02, DATA, 1 },
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.setscl = { 0x01, DATA, 1 },
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.getsda = { 0x10, STAT, 1 },
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},
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/* type 6: Barco LPT->DVI (K5800236) adapter */
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{
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.setsda = { 0x02, DATA, 1 },
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.setscl = { 0x01, DATA, 1 },
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.getsda = { 0x20, STAT, 0 },
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.getscl = { 0x40, STAT, 0 },
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.init = { 0xfc, DATA, 0 },
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},
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};
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static int type = -1;
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module_param(type, int, 0);
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MODULE_PARM_DESC(type,
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"Type of adapter:\n"
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" 0 = Philips adapter\n"
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" 1 = home brew teletext adapter\n"
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" 2 = Velleman K8000 adapter\n"
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" 3 = ELV adapter\n"
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" 4 = ADM1032 evaluation board\n"
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" 5 = ADM1025, ADM1030 and ADM1031 evaluation boards\n"
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" 6 = Barco LPT->DVI (K5800236) adapter\n"
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);
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