[WATCHDOG] Convert mtx1 wdt to be a platform device and use generic GPIO API

This patch converts the MTX-1 to be a platform device, use the available
generic GPIO API for the MTX-1 board and register the miscdev alias.

Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 30 insertions, 5 deletions

diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
index 98451747d3c..789831b3fa0 100644
--- a/drivers/watchdog/mtx-1_wdt.c
+++ b/drivers/watchdog/mtx-1_wdt.c
@@ -45,10 +45,13 @@
 #include <linux/completion.h>
 #include <linux/jiffies.h>
 #include <linux/watchdog.h>
+#include <linux/platform_device.h>
+
 #include <asm/io.h>
 #include <asm/uaccess.h>
 
 #include <asm/mach-au1x00/au1000.h>
+#include <asm/gpio.h>
 
 #define MTX1_WDT_INTERVAL       (5 * HZ)
 
@@ -61,6 +64,7 @@ static struct {
         volatile int queue;
         int default_ticks;
         unsigned long inuse;
+        unsigned gpio;
 } mtx1_wdt_device;
 
 static void mtx1_wdt_trigger(unsigned long unused)
@@ -73,7 +77,8 @@ static void mtx1_wdt_trigger(unsigned long unused)
          * toggle GPIO2_15
          */
         tmp = au_readl(GPIO2_DIR);
-        tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
+        tmp = (tmp & ~(1 << mtx1_wdt_device.gpio)) |
+              ((~tmp) & (1 << mtx1_wdt_device.gpio));
         au_writel (tmp, GPIO2_DIR);
 
         if (mtx1_wdt_device.queue && ticks)
@@ -93,7 +98,7 @@ static void mtx1_wdt_start(void)
 {
         if (!mtx1_wdt_device.queue) {
                 mtx1_wdt_device.queue = 1;
-                au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
+                gpio_set_value(mtx1_wdt_device.gpio, 1);
                 mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
         }
         mtx1_wdt_device.running++;
@@ -103,7 +108,7 @@ static int mtx1_wdt_stop(void)
 {
         if (mtx1_wdt_device.queue) {
                 mtx1_wdt_device.queue = 0;
-                au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
+                gpio_set_value(mtx1_wdt_device.gpio, 0);
         }
 
         ticks = mtx1_wdt_device.default_ticks;
@@ -197,10 +202,12 @@ static struct miscdevice mtx1_wdt_misc = {
 };
 
 
-static int __init mtx1_wdt_init(void)
+static int mtx1_wdt_probe(struct platform_device *pdev)
 {
         int ret;
 
+        mtx1_wdt_device.gpio = pdev->resource[0].start;
+
         if ((ret = misc_register(&mtx1_wdt_misc)) < 0) {
                 printk(KERN_ERR " mtx-1_wdt : failed to register\n");
                 return ret;
@@ -222,13 +229,30 @@ static int __init mtx1_wdt_init(void)
         return 0;
 }
 
-static void __exit mtx1_wdt_exit(void)
+static int mtx1_wdt_remove(struct platform_device *pdev)
 {
         if (mtx1_wdt_device.queue) {
                 mtx1_wdt_device.queue = 0;
                 wait_for_completion(&mtx1_wdt_device.stop);
         }
         misc_deregister(&mtx1_wdt_misc);
+        return 0;
+}
+
+static struct platform_driver mtx1_wdt = {
+        .probe = mtx1_wdt_probe,
+        .remove = mtx1_wdt_remove,
+        .driver.name = "mtx1-wdt",
+};
+
+static int __init mtx1_wdt_init(void)
+{
+        return platform_driver_register(&mtx1_wdt);
+}
+
+static void __exit mtx1_wdt_exit(void)
+{
+        platform_driver_unregister(&mtx1_wdt);
 }
 
 module_init(mtx1_wdt_init);
@@ -237,3 +261,4 @@ module_exit(mtx1_wdt_exit);
 MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
 MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);