[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>

diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
index 98451747d3cda0dd1b28fa87dda13a9685a6ee48..789831b3fa00a9cbbe050d4bde6b3053a702c280 100644 (file)
--- 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);