11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * i2c-pca-isa.c driver for PCA9564 on ISA boards 31da177e4SLinus Torvalds * Copyright (C) 2004 Arcom Control Systems 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 61da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 71da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 81da177e4SLinus Torvalds * (at your option) any later version. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 111da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 121da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 131da177e4SLinus Torvalds * GNU General Public License for more details. 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 161da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 171da177e4SLinus Torvalds * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include <linux/kernel.h> 211da177e4SLinus Torvalds #include <linux/ioport.h> 221da177e4SLinus Torvalds #include <linux/module.h> 231da177e4SLinus Torvalds #include <linux/moduleparam.h> 241da177e4SLinus Torvalds #include <linux/delay.h> 251da177e4SLinus Torvalds #include <linux/slab.h> 261da177e4SLinus Torvalds #include <linux/init.h> 271da177e4SLinus Torvalds #include <linux/interrupt.h> 281da177e4SLinus Torvalds #include <linux/wait.h> 291da177e4SLinus Torvalds 305cedb05dSJean Delvare #include <linux/isa.h> 311da177e4SLinus Torvalds #include <linux/i2c.h> 321da177e4SLinus Torvalds #include <linux/i2c-algo-pca.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include <asm/io.h> 351da177e4SLinus Torvalds #include <asm/irq.h> 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds #include "../algos/i2c-algo-pca.h" 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define IO_SIZE 4 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds #undef DEBUG_IO 421da177e4SLinus Torvalds //#define DEBUG_IO 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds static unsigned long base = 0x330; 451da177e4SLinus Torvalds static int irq = 10; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds /* Data sheet recommends 59kHz for 100kHz operation due to variation 481da177e4SLinus Torvalds * in the actual clock rate */ 491da177e4SLinus Torvalds static int clock = I2C_PCA_CON_59kHz; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds static int own = 0x55; 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds static wait_queue_head_t pca_wait; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static int pca_isa_getown(struct i2c_algo_pca_data *adap) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds return (own); 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds static int pca_isa_getclock(struct i2c_algo_pca_data *adap) 611da177e4SLinus Torvalds { 621da177e4SLinus Torvalds return (clock); 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds static void 661da177e4SLinus Torvalds pca_isa_writebyte(struct i2c_algo_pca_data *adap, int reg, int val) 671da177e4SLinus Torvalds { 681da177e4SLinus Torvalds #ifdef DEBUG_IO 691da177e4SLinus Torvalds static char *names[] = { "T/O", "DAT", "ADR", "CON" }; 701da177e4SLinus Torvalds printk("*** write %s at %#lx <= %#04x\n", names[reg], base+reg, val); 711da177e4SLinus Torvalds #endif 721da177e4SLinus Torvalds outb(val, base+reg); 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static int 761da177e4SLinus Torvalds pca_isa_readbyte(struct i2c_algo_pca_data *adap, int reg) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds int res = inb(base+reg); 791da177e4SLinus Torvalds #ifdef DEBUG_IO 801da177e4SLinus Torvalds { 811da177e4SLinus Torvalds static char *names[] = { "STA", "DAT", "ADR", "CON" }; 821da177e4SLinus Torvalds printk("*** read %s => %#04x\n", names[reg], res); 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds #endif 851da177e4SLinus Torvalds return res; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds static int pca_isa_waitforinterrupt(struct i2c_algo_pca_data *adap) 891da177e4SLinus Torvalds { 901da177e4SLinus Torvalds int ret = 0; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds if (irq > -1) { 931da177e4SLinus Torvalds ret = wait_event_interruptible(pca_wait, 941da177e4SLinus Torvalds pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI); 951da177e4SLinus Torvalds } else { 961da177e4SLinus Torvalds while ((pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0) 971da177e4SLinus Torvalds udelay(100); 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds return ret; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 1027d12e780SDavid Howells static irqreturn_t pca_handler(int this_irq, void *dev_id) { 1031da177e4SLinus Torvalds wake_up_interruptible(&pca_wait); 1041da177e4SLinus Torvalds return IRQ_HANDLED; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds static struct i2c_algo_pca_data pca_isa_data = { 1081da177e4SLinus Torvalds .get_own = pca_isa_getown, 1091da177e4SLinus Torvalds .get_clock = pca_isa_getclock, 1101da177e4SLinus Torvalds .write_byte = pca_isa_writebyte, 1111da177e4SLinus Torvalds .read_byte = pca_isa_readbyte, 1121da177e4SLinus Torvalds .wait_for_interrupt = pca_isa_waitforinterrupt, 1131da177e4SLinus Torvalds }; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds static struct i2c_adapter pca_isa_ops = { 1161da177e4SLinus Torvalds .owner = THIS_MODULE, 1171da177e4SLinus Torvalds .id = I2C_HW_A_ISA, 1181da177e4SLinus Torvalds .algo_data = &pca_isa_data, 1191da177e4SLinus Torvalds .name = "PCA9564 ISA Adapter", 1201da177e4SLinus Torvalds }; 1211da177e4SLinus Torvalds 1225cedb05dSJean Delvare static int __devinit pca_isa_probe(struct device *dev, unsigned int id) 1231da177e4SLinus Torvalds { 1241da177e4SLinus Torvalds init_waitqueue_head(&pca_wait); 1251da177e4SLinus Torvalds 1265cedb05dSJean Delvare dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq); 1271da177e4SLinus Torvalds 128104cb574SChristian Krafft #ifdef CONFIG_PPC_MERGE 129104cb574SChristian Krafft if (check_legacy_ioport(base)) { 130104cb574SChristian Krafft dev_err(dev, "I/O address %#08lx is not available\n", base); 131104cb574SChristian Krafft goto out; 132104cb574SChristian Krafft } 133104cb574SChristian Krafft #endif 134104cb574SChristian Krafft 1351da177e4SLinus Torvalds if (!request_region(base, IO_SIZE, "i2c-pca-isa")) { 1365cedb05dSJean Delvare dev_err(dev, "I/O address %#08lx is in use\n", base); 1371da177e4SLinus Torvalds goto out; 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds if (irq > -1) { 1411da177e4SLinus Torvalds if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) { 1425cedb05dSJean Delvare dev_err(dev, "Request irq%d failed\n", irq); 1431da177e4SLinus Torvalds goto out_region; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds if (i2c_pca_add_bus(&pca_isa_ops) < 0) { 1485cedb05dSJean Delvare dev_err(dev, "Failed to add i2c bus\n"); 1491da177e4SLinus Torvalds goto out_irq; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds return 0; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds out_irq: 1551da177e4SLinus Torvalds if (irq > -1) 1561da177e4SLinus Torvalds free_irq(irq, &pca_isa_ops); 1571da177e4SLinus Torvalds out_region: 1581da177e4SLinus Torvalds release_region(base, IO_SIZE); 1591da177e4SLinus Torvalds out: 1601da177e4SLinus Torvalds return -ENODEV; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 1635cedb05dSJean Delvare static int __devexit pca_isa_remove(struct device *dev, unsigned int id) 1641da177e4SLinus Torvalds { 1653269711bSJean Delvare i2c_del_adapter(&pca_isa_ops); 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds if (irq > 0) { 1681da177e4SLinus Torvalds disable_irq(irq); 1691da177e4SLinus Torvalds free_irq(irq, &pca_isa_ops); 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds release_region(base, IO_SIZE); 1725cedb05dSJean Delvare 1735cedb05dSJean Delvare return 0; 1745cedb05dSJean Delvare } 1755cedb05dSJean Delvare 1765cedb05dSJean Delvare static struct isa_driver pca_isa_driver = { 1775cedb05dSJean Delvare .probe = pca_isa_probe, 1785cedb05dSJean Delvare .remove = __devexit_p(pca_isa_remove), 1795cedb05dSJean Delvare .driver = { 1805cedb05dSJean Delvare .owner = THIS_MODULE, 1815cedb05dSJean Delvare .name = "i2c-pca-isa", 1825cedb05dSJean Delvare } 1835cedb05dSJean Delvare }; 1845cedb05dSJean Delvare 1855cedb05dSJean Delvare static int __init pca_isa_init(void) 1865cedb05dSJean Delvare { 1875cedb05dSJean Delvare return isa_register_driver(&pca_isa_driver, 1); 1885cedb05dSJean Delvare } 1895cedb05dSJean Delvare 1905cedb05dSJean Delvare static void __exit pca_isa_exit(void) 1915cedb05dSJean Delvare { 1925cedb05dSJean Delvare isa_unregister_driver(&pca_isa_driver); 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>"); 1961da177e4SLinus Torvalds MODULE_DESCRIPTION("ISA base PCA9564 driver"); 1971da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds module_param(base, ulong, 0); 2001da177e4SLinus Torvalds MODULE_PARM_DESC(base, "I/O base address"); 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds module_param(irq, int, 0); 2031da177e4SLinus Torvalds MODULE_PARM_DESC(irq, "IRQ"); 2041da177e4SLinus Torvalds module_param(clock, int, 0); 2051da177e4SLinus Torvalds MODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet"); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds module_param(own, int, 0); /* the driver can't do slave mode, so there's no real point in this */ 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds module_init(pca_isa_init); 2101da177e4SLinus Torvalds module_exit(pca_isa_exit); 211