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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-ali1563.c b/drivers/i2c/busses/i2c-ali1563.c
index 4b55ae19db8d..fc3e5b026423 100644
--- a/drivers/i2c/busses/i2c-ali1563.c
+++ b/drivers/i2c/busses/i2c-ali1563.c
@@ -21,6 +21,7 @@
 #include <linux/i2c.h>
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/acpi.h>
 
 #define ALI1563_MAX_TIMEOUT     500
 #define ALI1563_SMBBA           0x80
@@ -356,6 +357,10 @@ static int __devinit ali1563_setup(struct pci_dev * dev)
                 }
         }
 
+        if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
+                              ali1563_pci_driver.name))
+                goto Err;
+
         if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
                             ali1563_pci_driver.name)) {
                 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",