i2c-pca-isa.c revision 3269711b76ba27b78862c48398b0d313ccaa99c2
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * i2c-pca-isa.c driver for PCA9564 on ISA boards 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2004 Arcom Control Systems 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * it under the terms of the GNU General Public License as published by 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (at your option) any later version. 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is distributed in the hope that it will be useful, 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * GNU General Public License for more details. 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * You should have received a copy of the GNU General Public License 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * along with this program; if not, write to the Free Software 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioport.h> 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/moduleparam.h> 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/delay.h> 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/interrupt.h> 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/pci.h> 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/wait.h> 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/i2c.h> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/i2c-algo-pca.h> 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/io.h> 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/irq.h> 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "../algos/i2c-algo-pca.h" 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define IO_SIZE 4 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef DEBUG_IO 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds//#define DEBUG_IO 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long base = 0x330; 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int irq = 10; 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Data sheet recommends 59kHz for 100kHz operation due to variation 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in the actual clock rate */ 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int clock = I2C_PCA_CON_59kHz; 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int own = 0x55; 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic wait_queue_head_t pca_wait; 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int pca_isa_getown(struct i2c_algo_pca_data *adap) 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (own); 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int pca_isa_getclock(struct i2c_algo_pca_data *adap) 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (clock); 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldspca_isa_writebyte(struct i2c_algo_pca_data *adap, int reg, int val) 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef DEBUG_IO 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds static char *names[] = { "T/O", "DAT", "ADR", "CON" }; 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("*** write %s at %#lx <= %#04x\n", names[reg], base+reg, val); 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb(val, base+reg); 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldspca_isa_readbyte(struct i2c_algo_pca_data *adap, int reg) 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int res = inb(base+reg); 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef DEBUG_IO 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds static char *names[] = { "STA", "DAT", "ADR", "CON" }; 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("*** read %s => %#04x\n", names[reg], res); 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int pca_isa_waitforinterrupt(struct i2c_algo_pca_data *adap) 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = 0; 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (irq > -1) { 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = wait_event_interruptible(pca_wait, 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI); 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0) 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds udelay(100); 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1027d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t pca_handler(int this_irq, void *dev_id) { 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wake_up_interruptible(&pca_wait); 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct i2c_algo_pca_data pca_isa_data = { 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .get_own = pca_isa_getown, 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .get_clock = pca_isa_getclock, 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .write_byte = pca_isa_writebyte, 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .read_byte = pca_isa_readbyte, 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .wait_for_interrupt = pca_isa_waitforinterrupt, 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct i2c_adapter pca_isa_ops = { 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .id = I2C_HW_A_ISA, 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .algo_data = &pca_isa_data, 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "PCA9564 ISA Adapter", 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init pca_isa_init(void) 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds init_waitqueue_head(&pca_wait); 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "i2c-pca-isa: i/o base %#08lx. irq %d\n", base, irq); 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!request_region(base, IO_SIZE, "i2c-pca-isa")) { 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "i2c-pca-isa: I/O address %#08lx is in use.\n", base); 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (irq > -1) { 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) { 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "i2c-pca-isa: Request irq%d failed\n", irq); 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_region; 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c_pca_add_bus(&pca_isa_ops) < 0) { 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "i2c-pca-isa: Failed to add i2c bus\n"); 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_irq; 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_irq: 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (irq > -1) 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_irq(irq, &pca_isa_ops); 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_region: 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds release_region(base, IO_SIZE); 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENODEV; 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void pca_isa_exit(void) 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1593269711b76ba27b78862c48398b0d313ccaa99c2Jean Delvare i2c_del_adapter(&pca_isa_ops); 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (irq > 0) { 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds disable_irq(irq); 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_irq(irq, &pca_isa_ops); 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds release_region(base, IO_SIZE); 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>"); 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("ISA base PCA9564 driver"); 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(base, ulong, 0); 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_PARM_DESC(base, "I/O base address"); 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(irq, int, 0); 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_PARM_DESC(irq, "IRQ"); 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(clock, int, 0); 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet"); 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(own, int, 0); /* the driver can't do slave mode, so there's no real point in this */ 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(pca_isa_init); 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(pca_isa_exit); 184