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path: root/drivers/i2c/busses/i2c-pca-isa.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-pca-isa.c')
-rw-r--r--drivers/i2c/busses/i2c-pca-isa.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
index a119784bae10..9eb76268ec78 100644
--- a/drivers/i2c/busses/i2c-pca-isa.c
+++ b/drivers/i2c/busses/i2c-pca-isa.c
@@ -36,8 +36,8 @@
#define DRIVER "i2c-pca-isa"
#define IO_SIZE 4
-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 */
@@ -107,13 +107,26 @@ static struct i2c_adapter pca_isa_ops = {
.timeout = 100,
};
+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);
dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);
-#ifdef CONFIG_PPC_MERGE
+#ifdef CONFIG_PPC
if (check_legacy_ioport(base)) {
dev_err(dev, "I/O address %#08lx is not available\n", base);
goto out;
@@ -153,7 +166,7 @@ static int __devexit pca_isa_remove(struct device *dev, unsigned int id)
{
i2c_del_adapter(&pca_isa_ops);
- if (irq > 0) {
+ if (irq > -1) {
disable_irq(irq);
free_irq(irq, &pca_isa_ops);
}
@@ -163,6 +176,7 @@ static int __devexit pca_isa_remove(struct device *dev, unsigned int id)
}
static struct isa_driver pca_isa_driver = {
+ .match = pca_isa_match,
.probe = pca_isa_probe,
.remove = __devexit_p(pca_isa_remove),
.driver = {