/* *  i2c-pca-isa.c driver for PCA9564 on ISA boards *    Copyright (C) 2004 Arcom Control Systems * *  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. */#include <linux/config.h>#include <linux/kernel.h>#include <linux/ioport.h>#include <linux/module.h>#include <linux/moduleparam.h>#include <linux/delay.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/pci.h>#include <linux/wait.h>#include <linux/i2c.h>#include <linux/i2c-algo-pca.h>#include <asm/io.h>#include <asm/irq.h>#include "../algos/i2c-algo-pca.h"#define IO_SIZE 4#undef DEBUG_IO//#define DEBUG_IOstatic unsigned long base   = 0x330;static int irq 	  = 10;/* Data sheet recommends 59kHz for 100kHz operation due to variation * in the actual clock rate */static int clock  = I2C_PCA_CON_59kHz;static int own    = 0x55;static wait_queue_head_t pca_wait;static int pca_isa_getown(struct i2c_algo_pca_data *adap){	return (own);}static int pca_isa_getclock(struct i2c_algo_pca_data *adap){	return (clock);}static voidpca_isa_writebyte(struct i2c_algo_pca_data *adap, int reg, int val){#ifdef DEBUG_IO	static char *names[] = { "T/O", "DAT", "ADR", "CON" };	printk("*** write %s at %#lx <= %#04x\n", names[reg], base+reg, val);#endif	outb(val, base+reg);}static intpca_isa_readbyte(struct i2c_algo_pca_data *adap, int reg){	int res = inb(base+reg);#ifdef DEBUG_IO	{		static char *names[] = { "STA", "DAT", "ADR", "CON" };			printk("*** read  %s => %#04x\n", names[reg], res);	}#endif	return res;}static int pca_isa_waitforinterrupt(struct i2c_algo_pca_data *adap){	int ret = 0;	if (irq > -1) {		ret = wait_event_interruptible(pca_wait,					       pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI);	} else {		while ((pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0) 			udelay(100);	}	return ret;}static irqreturn_t pca_handler(int this_irq, void *dev_id, struct pt_regs *regs) {	wake_up_interruptible(&pca_wait);	return IRQ_HANDLED;}static struct i2c_algo_pca_data pca_isa_data = {	.get_own		= pca_isa_getown,	.get_clock		= pca_isa_getclock,	.write_byte		= pca_isa_writebyte,	.read_byte		= pca_isa_readbyte,	.wait_for_interrupt	= pca_isa_waitforinterrupt,};static struct i2c_adapter pca_isa_ops = {	.owner          = THIS_MODULE,	.id		= I2C_HW_A_ISA,	.algo_data	= &pca_isa_data,	.name		= "PCA9564 ISA Adapter",};static int __init pca_isa_init(void){	init_waitqueue_head(&pca_wait);	printk(KERN_INFO "i2c-pca-isa: i/o base %#08lx. irq %d\n", base, irq);	if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {		printk(KERN_ERR "i2c-pca-isa: I/O address %#08lx is in use.\n", base);		goto out;	}	if (irq > -1) {		if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) {			printk(KERN_ERR "i2c-pca-isa: Request irq%d failed\n", irq);			goto out_region;		}	}	if (i2c_pca_add_bus(&pca_isa_ops) < 0) {		printk(KERN_ERR "i2c-pca-isa: Failed to add i2c bus\n");		goto out_irq;	}	return 0; out_irq:	if (irq > -1)		free_irq(irq, &pca_isa_ops); out_region:	release_region(base, IO_SIZE); out:	return -ENODEV;}static void pca_isa_exit(void){	i2c_pca_del_bus(&pca_isa_ops);	if (irq > 0) {		disable_irq(irq);		free_irq(irq, &pca_isa_ops);	}	release_region(base, IO_SIZE);}MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");MODULE_DESCRIPTION("ISA base PCA9564 driver");MODULE_LICENSE("GPL");module_param(base, ulong, 0);MODULE_PARM_DESC(base, "I/O base address");module_param(irq, int, 0);MODULE_PARM_DESC(irq, "IRQ");module_param(clock, int, 0);MODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet");module_param(own, int, 0); /* the driver can't do slave mode, so there's no real point in this */module_init(pca_isa_init);module_exit(pca_isa_exit);