mirror of
https://github.com/lm-sensors/lm-sensors.git
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Frodo Looijaard
11e88380d5
README.directories contains a description of the directories I created; read it if you have questions about them. doc/design is the design document I sent before through email. doc/useful_addresses.html contains links to I2C, SMBus and sensors information. Note that we may have to change minor i2c things, like Makefiles; this is why I put it in the archive too (we should, of course, send important changes to Simon Vogl). git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3 7894878c-1315-0410-8ee3-d5d059ff63e0
147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/* ------------------------------------------------------------------------- */
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/* bit-elv.c i2c-hw access for philips style parallel port adapters */
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/* ------------------------------------------------------------------------- */
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/* Copyright (C) 1995-97 Simon G. Vogl
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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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static char rcsid[] = "$Id: bit-elv.c,v 1.1 1998/09/05 18:20:09 i2c Exp $";
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/*
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* $Log: bit-elv.c,v $
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* Revision 1.1 1998/09/05 18:20:09 i2c
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* Initial revision
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*
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* Revision 1.3 1998/01/20 10:01:29 i2c
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* *** empty log message ***
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*
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* Revision 1.2 1997/06/15 14:21:37 i2c
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* *** empty log message ***
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*
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*
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <asm/io.h>
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#include <linux/errno.h>
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#include "i2c.h"
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#include "i2c-priv.h"
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/* ----- global defines ----------------------------------------------- */
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#define DEB(x) /* should be reasonable open, close &c. */
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#define DEB2(x) /* low level debugging - very slow */
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#define DEBE(x) x /* error messages */
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#define DEBINIT(x) x /* detection status messages */
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/* ----- local functions ---------------------------------------------- */
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#if (BITADAPS) == 1
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#define Local inline
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#define bit_elv_getscl getscl
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#define bit_elv_setscl setscl
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#define bit_elv_getsda getsda
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#define bit_elv_setsda setsda
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#define bit_elv_bit_init bit_init
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#define bit_elv_bit_exit bit_exit
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#else
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#define Local static
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#endif
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#define portData(minor) ((char)((int)i2c_table[minor].minor_data))
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Local void bit_elv_setscl(int minor, int state)
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{
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if (state) {
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portData(minor)&=0xfe;
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} else {
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portData(minor)|=1;
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}
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outb(portData(minor), DATA);
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}
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Local void bit_elv_setsda(int minor, int state)
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{
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if (state) {
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portData(minor)&=0xfd;
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} else {
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portData(minor)|=2;
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}
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outb(portData(minor), DATA);
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}
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Local int bit_elv_getscl(int minor)
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{
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return ( 0 == ( (inb_p(STAT)) & 0x08 ) );
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}
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Local int bit_elv_getsda(int minor)
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{
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return ( 0 == ( (inb_p(STAT)) & 0x40 ) );
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}
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Local int bit_elv_bit_init(int minor)
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{
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if (check_region(i2c_table[minor].base,
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(i2c_table[minor].base == 0x3bc)? 3 : 8) < 0 ) {
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return -ENODEV;
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} else {
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/* test for ELV adap. */
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if (inb(STAT) & 0x80) { /* BUSY should be high */
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DEBINIT(printk("i2c ELV: Busy was low.\n"));
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return -ENODEV;
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} else {
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outb(0x04,CTRL); /* SLCT auf low */
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udelay(40);
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if ( inb(STAT) && 0x10 ) {
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outb(0x0c,CTRL);
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DEBINIT(printk("i2c ELV: Select was high.\n"));
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return -ENODEV;
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}
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}
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request_region(i2c_table[minor].base,
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(i2c_table[minor].base == 0x3bc)? 3 : 8,
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"i2c (ELV adapter)");
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portData(minor) = 0;
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outb(0,DATA);
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}
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DEBINIT(printk("i2c%d: scl: %d sda %d \n",minor,
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bit_elv_getscl(minor),bit_elv_getsda(minor)) );
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return 0;
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}
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Local void bit_elv_bit_exit(int minor)
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{
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outb(0,DATA);
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outb(0x0c,CTRL);
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release_region( i2c_table[minor].base ,
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(i2c_table[minor].base == 0x3bc)? 3 : 8 );
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}
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/* ------------------------------------------------------------------------
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* Encapsulate the above functions in the correct operations structure.
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* This is only done when more than one hardware adapter is supported.
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*/
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#if (BITADAPS) > 1
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struct i2c_bit_opns bit_elv_ops = {
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bit_elv_setscl,
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bit_elv_setsda,
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bit_elv_getscl,
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bit_elv_getsda,
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bit_elv_bit_init,
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bit_elv_bit_exit
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};
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#endif
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