i2c: Check for ACPI resource conflicts
Check for ACPI resource conflicts in i2c bus drivers. I've included
all recent SMBus master drivers for PC hardware.
I've voluntarily left out:
* Drivers that don't run on PCs: they can't conflict with ACPI.
* Bit-banged bus device drivers: it's very unlikely that ACPI would
deal with such buses.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
index 2654f20..3b19bc4 100644
--- a/drivers/i2c/busses/i2c-nforce2.c
+++ b/drivers/i2c/busses/i2c-nforce2.c
@@ -51,6 +51,7 @@
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/dmi.h>
+#include <linux/acpi.h>
#include <asm/io.h>
MODULE_LICENSE("GPL");
@@ -343,6 +344,11 @@
smbus->size = 64;
}
+ error = acpi_check_region(smbus->base, smbus->size,
+ nforce2_driver.name);
+ if (error)
+ return -1;
+
if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
smbus->base, smbus->base+smbus->size-1, name);