mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-24 12:04:33 +00:00
Frodo Looijaard
634cb32ac0
I really hope I did not forget an add or remove. If strange things happen when you compile, please let me know. There may still be problems with the EXPORT_* stuff; it seems to work now for kernel 2.0.36pre19, but it may give trouble for earlier kernels. We need to check that. Some i2c modules may be a bit verbose at this moment. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@184 7894878c-1315-0410-8ee3-d5d059ff63e0
199 lines
4.9 KiB
C
199 lines
4.9 KiB
C
/* ------------------------------------------------------------------------- */
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/* bit-velle.c i2c-hw access for Velleman K9000 adapters */
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/* ------------------------------------------------------------------------- */
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/* Copyright (C) 1995-96 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-velle.c,v 1.4 1998/12/30 08:36:08 i2c Exp i2c $";
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/*
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* $Log: bit-velle.c,v $
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* Revision 1.4 1998/12/30 08:36:08 i2c
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* *** empty log message ***
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*
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* Revision 1.3 1998/09/15 18:50:04 i2c
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* *** empty log message ***
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*
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* Revision 1.2 1998/09/13 16:54:55 i2c
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* *** empty log message ***
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*
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* Revision 1.1 1998/07/29 08:09:35 i2c
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* Initial revision
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*
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* Revision 1.1 1998/01/20 10:01:29 i2c
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* Initial revision
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*
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* Revision 1.1 1996/11/17 11:00:03 i2c
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* Initial revision
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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/ioport.h>
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#include <linux/module.h>
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#include <linux/string.h> /* for 2.0 kernels to get NULL */
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#include <asm/errno.h> /* for 2.0 kernels to get ENODEV */
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#include <asm/io.h>
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#include "i2c.h"
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#include "algo-bit.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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/* Pin Port Inverted name */
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#define I2C_SDA 0x02 /* ctrl bit 1 (inv) */
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#define I2C_SCL 0x08 /* ctrl bit 3 (inv) */
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#define I2C_SDAIN 0x10 /* stat bit 4 */
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#define I2C_SCLIN 0x08 /* ctrl bit 3 (inv) (reads own output) */
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#define I2C_DMASK 0xfd
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#define I2C_CMASK 0xf7
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/* --- Convenience defines for the parallel port: */
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#define BASE (unsigned int)(data)
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#define DATA BASE /* Centronics data port */
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#define STAT (BASE+1) /* Centronics status port */
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#define CTRL (BASE+2) /* Centronics control port */
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#define DEFAULT_BASE 0x378
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int base=0;
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/* ----- local functions --------------------------------------------------- */
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void bit_velle_setscl(void *data, int state)
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{
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if (state) {
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outb(inb(CTRL) & I2C_CMASK, CTRL);
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} else {
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outb(inb(CTRL) | I2C_SCL, CTRL);
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}
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}
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void bit_velle_setsda(void *data, int state)
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{
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if (state) {
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outb(inb(CTRL) & I2C_DMASK , CTRL);
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} else {
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outb(inb(CTRL) | I2C_SDA, CTRL);
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}
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}
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int bit_velle_getscl(void *data)
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{
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return ( 0 == ( (inb(CTRL)) & I2C_SCLIN ) );
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}
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int bit_velle_getsda(void *data)
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{
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return ( 0 != ( (inb(STAT)) & I2C_SDAIN ) );
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}
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int bit_velle_init(void)
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{
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if (check_region(base,(base == 0x3bc)? 3 : 8) < 0 ) {
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DEBE(printk("i2c_init: Port %#x already in use.\n", base));
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return -ENODEV;
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} else {
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request_region(base, (base == 0x3bc)? 3 : 8,
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"i2c (Vellemann adapter)");
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bit_velle_setsda((void*)base,1);
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bit_velle_setscl((void*)base,1);
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}
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return 0;
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}
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void bit_velle_exit(void)
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{
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release_region( base , (base == 0x3bc)? 3 : 8 );
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}
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int bit_velle_reg(struct i2c_client *client)
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{
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MOD_INC_USE_COUNT;
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return 0;
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}
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int bit_velle_unreg(struct i2c_client *client)
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{
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MOD_DEC_USE_COUNT;
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return 0;
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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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struct bit_adapter bit_velle_ops = {
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"Philips Parallel port adapter",
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HW_B_LP,
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NULL,
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bit_velle_setsda,
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bit_velle_setscl,
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bit_velle_getsda,
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bit_velle_getscl,
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bit_velle_reg,
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bit_velle_unreg,
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10, 10, 100, /* waits, timeout */
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};
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#ifdef MODULE
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MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
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MODULE_DESCRIPTION("I2C-Bus adapter routines for Velleman K9000 adapter");
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MODULE_PARM(base, "i");
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int init_module(void)
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{
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if (base==0) {
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/* probe some values */
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base=DEFAULT_BASE;
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bit_velle_ops.data=(void*)DEFAULT_BASE;
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if (bit_velle_init()==0) {
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i2c_bit_add_bus(&bit_velle_ops);
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} else {
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return -ENODEV;
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}
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} else {
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bit_velle_ops.data=(void*)base;
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if (bit_velle_init()==0) {
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i2c_bit_add_bus(&bit_velle_ops);
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} else {
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return -ENODEV;
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}
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}
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printk("bit_velle: found device at %#x.\n",base);
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return 0;
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}
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void cleanup_module(void)
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{
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i2c_bit_del_bus(&bit_velle_ops);
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bit_velle_exit();
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}
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#endif
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