i2c-parport-light: Don't register a platform device resource

The i2c-parport-light driver isn't a real platform driver, so it
should not instantiate platform devices with resources. The resource
management system can't cope with colliding resources, and we are
likely to create such a colliding resource.

So, better just try to grab the I/O ports we need right at module
initialization time, and bail out if we can't. It has the added
benefit that the module will no longer load if it isn't going to work,
which is definitely more user-friendly.

Signed-off-by: Jean Delvare <[e-mail]>

drivers/i2c/busses/i2c-parport-light.c

···
 static int __devinit i2c_parport_probe(struct platform_device *pdev)
 {
 	int err;
-	struct resource *res;
-
-	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-	if (!request_region(res->start, res->end - res->start + 1, DRVNAME))
-		return -EBUSY;
 
 	/* Reset hardware to a sane state (SCL and SDA high) */
 	parport_setsda(NULL, 1);
···
 
 	parport_adapter.dev.parent = &pdev->dev;
 	err = i2c_bit_add_bus(&parport_adapter);
-	if (err) {
+	if (err)
 		dev_err(&pdev->dev, "Unable to register with I2C\n");
-		goto exit_region;
-	}
-	return 0;
-
-exit_region:
-	release_region(res->start, res->end - res->start + 1);
 	return err;
 }
 
 static int __devexit i2c_parport_remove(struct platform_device *pdev)
 {
-	struct resource *res;
-
 	i2c_del_adapter(&parport_adapter);
 
 	/* Un-init if needed (power off...) */
 	if (adapter_parm[type].init.val)
 		line_set(0, &adapter_parm[type].init);
 
-	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-	release_region(res->start, res->end - res->start + 1);
 	return 0;
 }
 
···
 
 static int __init i2c_parport_device_add(u16 address)
 {
-	struct resource res = {
-		.start	= address,
-		.end	= address + 2,
-		.name	= DRVNAME,
-		.flags	= IORESOURCE_IO,
-	};
 	int err;
 
 	pdev = platform_device_alloc(DRVNAME, -1);
···
 		err = -ENOMEM;
 		printk(KERN_ERR DRVNAME ": Device allocation failed\n");
 		goto exit;
-	}
-
-	err = platform_device_add_resources(pdev, &res, 1);
-	if (err) {
-		printk(KERN_ERR DRVNAME ": Device resource addition failed "
-		       "(%d)\n", err);
-		goto exit_device_put;
 	}
 
 	err = platform_device_add(pdev);
···
 		base = DEFAULT_BASE;
 	}
 
+	if (!request_region(base, 3, DRVNAME))
+		return -EBUSY;
+
         if (!adapter_parm[type].getscl.val)
 		parport_algo_data.getscl = NULL;
 
 	/* Sets global pdev as a side effect */
 	err = i2c_parport_device_add(base);
 	if (err)
-		goto exit;
+		goto exit_release;
 
 	err = platform_driver_register(&i2c_parport_driver);
 	if (err)
···
 
 exit_device:
 	platform_device_unregister(pdev);
-exit:
+exit_release:
+	release_region(base, 3);
 	return err;
 }
 
···
 {
 	platform_driver_unregister(&i2c_parport_driver);
 	platform_device_unregister(pdev);
+	release_region(base, 3);
 }
 
 MODULE_AUTHOR("Jean Delvare <[e-mail]>");