/*
* i2c-pca-isa.c driver for PCA9564 on ISA boards
* Copyright (C) 2004 Arcom Control Systems
+ * Copyright (C) 2008 Pengutronix
*
* 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
* 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/isa.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 DRIVER "i2c-pca-isa"
#define IO_SIZE 4
-#undef DEBUG_IO
-//#define DEBUG_IO
-
-static unsigned long base = 0x330;
-static int irq = 10;
+static unsigned long base;
+static int irq = -1;
/* 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 void
-pca_isa_writebyte(struct i2c_algo_pca_data *adap, int reg, int val)
+static void pca_isa_writebyte(void *pd, int reg, int val)
{
#ifdef DEBUG_IO
static char *names[] = { "T/O", "DAT", "ADR", "CON" };
outb(val, base+reg);
}
-static int
-pca_isa_readbyte(struct i2c_algo_pca_data *adap, int reg)
+static int pca_isa_readbyte(void *pd, int reg)
{
int res = inb(base+reg);
#ifdef DEBUG_IO
{
- static char *names[] = { "STA", "DAT", "ADR", "CON" };
+ 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)
+static int pca_isa_waitforcompletion(void *pd)
{
int ret = 0;
if (irq > -1) {
ret = wait_event_interruptible(pca_wait,
- pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI);
+ pca_isa_readbyte(pd, I2C_PCA_CON) & I2C_PCA_CON_SI);
} else {
- while ((pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
+ while ((pca_isa_readbyte(pd, 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) {
+static void pca_isa_resetchip(void *pd)
+{
+ /* apparently only an external reset will do it. not a lot can be done */
+ printk(KERN_WARNING DRIVER ": Haven't figured out how to do a reset yet\n");
+}
+
+static irqreturn_t pca_handler(int this_irq, void *dev_id) {
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,
+ /* .data intentionally left NULL, not needed with ISA */
.write_byte = pca_isa_writebyte,
.read_byte = pca_isa_readbyte,
- .wait_for_interrupt = pca_isa_waitforinterrupt,
+ .wait_for_completion = pca_isa_waitforcompletion,
+ .reset_chip = pca_isa_resetchip,
};
static struct i2c_adapter pca_isa_ops = {
.id = I2C_HW_A_ISA,
.algo_data = &pca_isa_data,
.name = "PCA9564 ISA Adapter",
+ .timeout = 100,
};
-static int __init pca_isa_init(void)
+static int __devinit pca_isa_match(struct device *dev, unsigned int id)
{
+ int match = base != 0;
+ if (match) {
+ if (irq <= -1)
+ dev_warn(dev, "Using polling mode (specify irq)\n");
+ } else
+ dev_err(dev, "Please specify I/O base\n");
+
+ return match;
+}
+
+static int __devinit pca_isa_probe(struct device *dev, unsigned int id)
+{
init_waitqueue_head(&pca_wait);
- printk(KERN_INFO "i2c-pca-isa: i/o base %#08lx. irq %d\n", base, irq);
+ dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);
+
+#ifdef CONFIG_PPC
+ if (check_legacy_ioport(base)) {
+ dev_err(dev, "I/O address %#08lx is not available\n", base);
+ goto out;
+ }
+#endif
if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
- printk(KERN_ERR "i2c-pca-isa: I/O address %#08lx is in use.\n", base);
+ dev_err(dev, "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);
+ dev_err(dev, "Request irq%d failed\n", irq);
goto out_region;
}
}
+ pca_isa_data.i2c_clock = clock;
if (i2c_pca_add_bus(&pca_isa_ops) < 0) {
- printk(KERN_ERR "i2c-pca-isa: Failed to add i2c bus\n");
+ dev_err(dev, "Failed to add i2c bus\n");
goto out_irq;
}
return -ENODEV;
}
-static void pca_isa_exit(void)
+static int __devexit pca_isa_remove(struct device *dev, unsigned int id)
{
- i2c_pca_del_bus(&pca_isa_ops);
+ i2c_del_adapter(&pca_isa_ops);
- if (irq > 0) {
+ if (irq > -1) {
disable_irq(irq);
free_irq(irq, &pca_isa_ops);
}
release_region(base, IO_SIZE);
+
+ return 0;
+}
+
+static struct isa_driver pca_isa_driver = {
+ .match = pca_isa_match,
+ .probe = pca_isa_probe,
+ .remove = __devexit_p(pca_isa_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER,
+ }
+};
+
+static int __init pca_isa_init(void)
+{
+ return isa_register_driver(&pca_isa_driver, 1);
+}
+
+static void __exit pca_isa_exit(void)
+{
+ isa_unregister_driver(&pca_isa_driver);
}
MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff