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, 6 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-ali1535.c b/drivers/i2c/busses/i2c-ali1535.c
index 8d1d90ab3a90..442d559b1aa9 100644
--- a/drivers/i2c/busses/i2c-ali1535.c
+++ b/drivers/i2c/busses/i2c-ali1535.c
@@ -61,6 +61,7 @@
 #include <linux/ioport.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
+#include <linux/acpi.h>
 #include <asm/io.h>
 
 
@@ -159,6 +160,11 @@ static int ali1535_setup(struct pci_dev *dev)
                 goto exit;
         }
 
+        retval = acpi_check_region(ali1535_smba, ALI1535_SMB_IOSIZE,
+                                   ali1535_driver.name);
+        if (retval)
+                goto exit;
+
         if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE,
                             ali1535_driver.name)) {
                 dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",