[PATCH 2/2] ar7_wdt: convert to become a platform driver

[Florian Fainelli <florian@openwrt.org>]

This patch converts the ar7_wdt driver to become a platform
driver. The AR7 SoC specific identification and base register
calculation is performed by the board code, therefore we no
longer need to have access to ar7_chip_id.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
---
diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c
index bfce332..9c2c4e7 100644
--- a/drivers/watchdog/ar7_wdt.c
+++ b/drivers/watchdog/ar7_wdt.c
@@ -28,6 +28,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/miscdevice.h>
+#include <linux/platform_device.h>
 #include <linux/watchdog.h>
 #include <linux/notifier.h>
 #include <linux/reboot.h>
@@ -76,24 +77,10 @@ static unsigned expect_close;
 /* XXX currently fixed, allows max margin ~68.72 secs */
 #define prescale_value 0xffff
 
-/* Offset of the WDT registers */
-static unsigned long ar7_regs_wdt;
+/* Resource of the WDT registers */
+static struct resource *ar7_regs_wdt;
 /* Pointer to the remapped WDT IO space */
 static struct ar7_wdt *ar7_wdt;
-static void ar7_wdt_get_regs(void)
-{
-       u16 chip_id = ar7_chip_id();
-       switch (chip_id) {
-       case AR7_CHIP_7100:
-       case AR7_CHIP_7200:
-               ar7_regs_wdt = AR7_REGS_WDT;
-               break;
-       default:
-               ar7_regs_wdt = UR8_REGS_WDT;
-               break;
-       }
-}
-
 
 static void ar7_wdt_kick(u32 value)
 {
@@ -298,22 +285,33 @@ static struct miscdevice ar7_wdt_miscdev = {
        .fops           = &ar7_wdt_fops,
 };
 
-static int __init ar7_wdt_init(void)
+static int __init ar7_wdt_probe(struct platform_device *pdev)
 {
        int rc;
 
        spin_lock_init(&wdt_lock);
 
-       ar7_wdt_get_regs();
+       ar7_regs_wdt =
+               platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+       if (!ar7_regs_wdt) {
+               printk(KERN_ERR DRVNAME ": could not get registers resource\n");
+               rc = -ENODEV;
+               goto out;
+       }
 
-       if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
-                                                       LONGNAME)) {
+       if (!request_mem_region(ar7_regs_wdt->start,
+                               resource_size(ar7_regs_wdt), LONGNAME)) {
                printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
-               return -EBUSY;
+               rc = -EBUSY;
+               goto out;
        }
 
-       ar7_wdt = (struct ar7_wdt *)
-                       ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt));
+       ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+       if (!ar7_wdt) {
+               printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
+               rc = -ENXIO;
+               goto out;
+       }
 
        ar7_wdt_disable_wdt();
        ar7_wdt_prescale(prescale_value);
@@ -337,17 +335,35 @@ out_register:
        unregister_reboot_notifier(&ar7_wdt_notifier);
 out_alloc:
        iounmap(ar7_wdt);
-       release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+       release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
 out:
        return rc;
 }
 
-static void __exit ar7_wdt_cleanup(void)
+static int __devexit ar7_wdt_remove(struct platform_device *pdev)
 {
        misc_deregister(&ar7_wdt_miscdev);
        unregister_reboot_notifier(&ar7_wdt_notifier);
        iounmap(ar7_wdt);
-       release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+       release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+
+       return 0;
+}
+
+static struct platform_driver ar7_wdt_driver = {
+       .driver.name = "ar7_wdt",
+       .probe = ar7_wdt_probe,
+       .remove = __devexit_p(ar7_wdt_remove),
+};
+
+static int __init ar7_wdt_init(void)
+{
+       return platform_driver_register(&ar7_wdt_driver);
+}
+
+static void __exit ar7_wdt_cleanup(void)
+{
+       platform_driver_unregister(&ar7_wdt_driver);
 }
 
 module_init(ar7_wdt_init);