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>

1 files changed, 117 insertions, 27 deletions

diff --git a/drivers/i2c/busses/i2c-parport-light.c b/drivers/i2c/busses/i2c-parport-light.c
index 4bc42810b9aa..49a95e2887bc 100644
--- a/drivers/i2c/busses/i2c-parport-light.c
+++ b/drivers/i2c/busses/i2c-parport-light.c
@@ -1,7 +1,7 @@
 /* ------------------------------------------------------------------------ *
- * 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>");