+++ /dev/null
-/* ------------------------------------------------------------------------- */
-/* i2c-elv.c i2c-hw access for philips style parallel port adapters */
-/* ------------------------------------------------------------------------- */
-/* Copyright (C) 1995-2000 Simon G. Vogl
-
- 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. */
-/* ------------------------------------------------------------------------- */
-
-/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
- Frodo Looijaard <frodol@dds.nl> */
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/errno.h>
-#include <linux/i2c.h>
-#include <linux/i2c-algo-bit.h>
-#include <asm/io.h>
-
-#define DEFAULT_BASE 0x378
-static long base=0;
-static unsigned char port_data = 0;
-
-/* --- Convenience defines for the parallel port: */
-#define BASE (unsigned long)(data)
-#define DATA BASE /* Centronics data port */
-#define STAT (BASE+1) /* Centronics status port */
-#define CTRL (BASE+2) /* Centronics control port */
-
-
-/* ----- local functions ---------------------------------------------- */
-
-
-static void bit_elv_setscl(void *data, int state)
-{
- if (state) {
- port_data &= 0xfe;
- } else {
- port_data |=1;
- }
- outb(port_data, DATA);
-}
-
-static void bit_elv_setsda(void *data, int state)
-{
- if (state) {
- port_data &=0xfd;
- } else {
- port_data |=2;
- }
- outb(port_data, DATA);
-}
-
-static int bit_elv_getscl(void *data)
-{
- return ( 0 == ( (inb_p(STAT)) & 0x08 ) );
-}
-
-static int bit_elv_getsda(void *data)
-{
- return ( 0 == ( (inb_p(STAT)) & 0x40 ) );
-}
-
-static int bit_elv_init(void)
-{
- if (!request_region(base, (base == 0x3bc) ? 3 : 8,
- "i2c (ELV adapter)"))
- return -ENODEV;
-
- if (inb(base+1) & 0x80) { /* BUSY should be high */
- pr_debug("i2c-elv: Busy was low.\n");
- goto fail;
- }
-
- outb(0x0c,base+2); /* SLCT auf low */
- udelay(400);
- if (!(inb(base+1) && 0x10)) {
- outb(0x04,base+2);
- pr_debug("i2c-elv: Select was high.\n");
- goto fail;
- }
-
- port_data = 0;
- bit_elv_setsda((void*)base,1);
- bit_elv_setscl((void*)base,1);
- return 0;
-
-fail:
- release_region(base , (base == 0x3bc) ? 3 : 8);
- return -ENODEV;
-}
-
-/* ------------------------------------------------------------------------
- * Encapsulate the above functions in the correct operations structure.
- * This is only done when more than one hardware adapter is supported.
- */
-static struct i2c_algo_bit_data bit_elv_data = {
- .setsda = bit_elv_setsda,
- .setscl = bit_elv_setscl,
- .getsda = bit_elv_getsda,
- .getscl = bit_elv_getscl,
- .udelay = 80,
- .mdelay = 80,
- .timeout = HZ
-};
-
-static struct i2c_adapter bit_elv_ops = {
- .owner = THIS_MODULE,
- .algo_data = &bit_elv_data,
- .name = "ELV Parallel port adaptor",
-};
-
-static int __init i2c_bitelv_init(void)
-{
- printk(KERN_INFO "i2c ELV parallel port adapter driver\n");
- if (base==0) {
- /* probe some values */
- base=DEFAULT_BASE;
- bit_elv_data.data=(void*)DEFAULT_BASE;
- if (bit_elv_init()==0) {
- if(i2c_bit_add_bus(&bit_elv_ops) < 0)
- return -ENODEV;
- } else {
- return -ENODEV;
- }
- } else {
- i2c_set_adapdata(&bit_elv_ops, (void *)base);
- if (bit_elv_init()==0) {
- if(i2c_bit_add_bus(&bit_elv_ops) < 0)
- return -ENODEV;
- } else {
- return -ENODEV;
- }
- }
- pr_debug("i2c-elv: found device at %#lx.\n",base);
- return 0;
-}
-
-static void __exit i2c_bitelv_exit(void)
-{
- i2c_bit_del_bus(&bit_elv_ops);
- release_region(base , (base == 0x3bc) ? 3 : 8);
-}
-
-MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
-MODULE_DESCRIPTION("I2C-Bus adapter routines for ELV parallel port adapter");
-MODULE_LICENSE("GPL");
-
-MODULE_PARM(base, "i");
-
-module_init(i2c_bitelv_init);
-module_exit(i2c_bitelv_exit);
projects / history.git / commitdiff