/* ------------------------------------------------------------------------- */ /* i2c-velleman.c i2c-hw access for Velleman K9000 adapters */ /* ------------------------------------------------------------------------- */ /* Copyright (C) 1995-96, 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. */ /* ------------------------------------------------------------------------- */ /* $Id: i2c-velleman.c,v 1.29 2003/01/21 08:08:16 kmalkki Exp $ */ #include <linux/kernel.h> #include <linux/ioport.h> #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/i2c-algo-bit.h> #include <asm/io.h> /* ----- global defines ----------------------------------------------- */ #define DEB(x) /* should be reasonable open, close &c. */ #define DEB2(x) /* low level debugging - very slow */ #define DEBE(x) x /* error messages */ /* Pin Port Inverted name */ #define I2C_SDA 0x02 /* ctrl bit 1 (inv) */ #define I2C_SCL 0x08 /* ctrl bit 3 (inv) */ #define I2C_SDAIN 0x10 /* stat bit 4 */ #define I2C_SCLIN 0x08 /* ctrl bit 3 (inv)(reads own output)*/ #define I2C_DMASK 0xfd #define I2C_CMASK 0xf7 /* --- Convenience defines for the parallel port: */ #define BASE (unsigned int)(data) #define DATA BASE /* Centronics data port */ #define STAT (BASE+1) /* Centronics status port */ #define CTRL (BASE+2) /* Centronics control port */ #define DEFAULT_BASE 0x378 static int base=0; /* ----- local functions --------------------------------------------------- */ static void bit_velle_setscl(void *data, int state) { if (state) { outb(inb(CTRL) & I2C_CMASK, CTRL); } else { outb(inb(CTRL) | I2C_SCL, CTRL); } } static void bit_velle_setsda(void *data, int state) { if (state) { outb(inb(CTRL) & I2C_DMASK , CTRL); } else { outb(inb(CTRL) | I2C_SDA, CTRL); } } static int bit_velle_getscl(void *data) { return ( 0 == ( (inb(CTRL)) & I2C_SCLIN ) ); } static int bit_velle_getsda(void *data) { return ( 0 != ( (inb(STAT)) & I2C_SDAIN ) ); } static int bit_velle_init(void) { if (!request_region(base, (base == 0x3bc) ? 3 : 8, "i2c (Vellemann adapter)")) return -ENODEV; bit_velle_setsda((void*)base,1); bit_velle_setscl((void*)base,1); return 0; } /* ------------------------------------------------------------------------ * 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_velle_data = { .setsda = bit_velle_setsda, .setscl = bit_velle_setscl, .getsda = bit_velle_getsda, .getscl = bit_velle_getscl, .udelay = 10, .mdelay = 10, .timeout = HZ }; static struct i2c_adapter bit_velle_ops = { .owner = THIS_MODULE, .algo_data = &bit_velle_data, .name = "Velleman K8000", }; static int __init i2c_bitvelle_init(void) { printk(KERN_INFO "i2c-velleman.o: i2c Velleman K8000 adapter module version %s (%s)\n", I2C_VERSION, I2C_DATE); if (base==0) { /* probe some values */ base=DEFAULT_BASE; bit_velle_data.data=(void*)DEFAULT_BASE; if (bit_velle_init()==0) { if(i2c_bit_add_bus(&bit_velle_ops) < 0) return -ENODEV; } else { return -ENODEV; } } else { bit_velle_data.data=(void*)base; if (bit_velle_init()==0) { if(i2c_bit_add_bus(&bit_velle_ops) < 0) return -ENODEV; } else { return -ENODEV; } } printk(KERN_DEBUG "i2c-velleman.o: found device at %#x.\n",base); return 0; } static void __exit i2c_bitvelle_exit(void) { i2c_bit_del_bus(&bit_velle_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 Velleman K8000 adapter"); MODULE_LICENSE("GPL"); MODULE_PARM(base, "i"); module_init(i2c_bitvelle_init); module_exit(i2c_bitvelle_exit);