i2c-parport-light: Port to the new device driver model

Also fix a small race on driver unload: we need to unregister the
i2c adapter before we power it off.
Signed-off-by: Jean Delvare <khali@linux-fr.org>

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

 /* ------------------------------------------------------------------------ *
- * i2c-parport.c I2C bus over parallel port                                 *
+ * i2c-parport-light.c I2C bus over parallel port                           *
  * ------------------------------------------------------------------------ *
-   Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+   Copyright (C) 2003-2007 Jean Delvare <khali@linux-fr.org>
    
    Based on older i2c-velleman.c driver
    Copyright (C) 1995-2000 Simon G. Vogl
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/platform_device.h>
 #include <linux/ioport.h>
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
@@ -34,6 +35,9 @@
 #include "i2c-parport.h"
 
 #define DEFAULT_BASE 0x378
+#define DRVNAME "i2c-parport-light"
+
+static struct platform_device *pdev;
 
 static u16 base;
 module_param(base, ushort, 0);
@@ -106,7 +110,7 @@ static struct i2c_algo_bit_data parport_algo_data = {
 	.timeout	= HZ,
 }; 
 
-/* ----- I2c structure ---------------------------------------------------- */
+/* ----- Driver registration ---------------------------------------------- */
 
 static struct i2c_adapter parport_adapter = {
 	.owner		= THIS_MODULE,
@@ -116,55 +120,141 @@ static struct i2c_adapter parport_adapter = {
 	.name		= "Parallel port adapter (light)",
 };
 
-/* ----- Module loading, unloading and information ------------------------ */
+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_setscl(NULL, 1);
+	/* Other init if needed (power on...) */
+	if (adapter_parm[type].init.val)
+		line_set(1, &adapter_parm[type].init);
+
+	parport_adapter.dev.parent = &pdev->dev;
+	err = i2c_bit_add_bus(&parport_adapter);
+	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 struct platform_driver i2c_parport_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= DRVNAME,
+	},
+	.probe		= i2c_parport_probe,
+	.remove		= __devexit_p(i2c_parport_remove),
+};
+
+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);
+	if (!pdev) {
+		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);
+	if (err) {
+		printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
+		       err);
+		goto exit_device_put;
+	}
+
+	return 0;
+
+exit_device_put:
+	platform_device_put(pdev);
+exit:
+	return err;
+}
 
 static int __init i2c_parport_init(void)
 {
+	int err;
+
 	if (type < 0) {
-		printk(KERN_WARNING "i2c-parport: adapter type unspecified\n");
+		printk(KERN_ERR DRVNAME ": adapter type unspecified\n");
 		return -ENODEV;
 	}
 
 	if (type >= ARRAY_SIZE(adapter_parm)) {
-		printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
+		printk(KERN_ERR DRVNAME ": invalid type (%d)\n", type);
 		return -ENODEV;
 	}
 
 	if (base == 0) {
-		printk(KERN_INFO "i2c-parport: using default base 0x%x\n", DEFAULT_BASE);
+		pr_info(DRVNAME ": using default base 0x%x\n", DEFAULT_BASE);
 		base = DEFAULT_BASE;
 	}
 
-	if (!request_region(base, 3, "i2c-parport"))
-		return -ENODEV;
-
         if (!adapter_parm[type].getscl.val)
 		parport_algo_data.getscl = NULL;
 
-	/* Reset hardware to a sane state (SCL and SDA high) */
-	parport_setsda(NULL, 1);
-	parport_setscl(NULL, 1);
-	/* Other init if needed (power on...) */
-	if (adapter_parm[type].init.val)
-		line_set(1, &adapter_parm[type].init);
+	/* Sets global pdev as a side effect */
+	err = i2c_parport_device_add(base);
+	if (err)
+		goto exit;
 
-	if (i2c_bit_add_bus(&parport_adapter) < 0) {
-		printk(KERN_ERR "i2c-parport: Unable to register with I2C\n");
-		release_region(base, 3);
-		return -ENODEV;
-	}
+	err = platform_driver_register(&i2c_parport_driver);
+	if (err)
+		goto exit_device;
 
 	return 0;
+
+exit_device:
+	platform_device_unregister(pdev);
+exit:
+	return err;
 }
 
 static void __exit i2c_parport_exit(void)
 {
-	/* Un-init if needed (power off...) */
-	if (adapter_parm[type].init.val)
-		line_set(0, &adapter_parm[type].init);
-
-	i2c_del_adapter(&parport_adapter);
-	release_region(base, 3);
+	platform_driver_unregister(&i2c_parport_driver);
+	platform_device_unregister(pdev);
 }
 
 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");