watchdog: Convert ep93xx driver to watchdog core

Convert the ep93xx_wdt driver to the watchdog framework API.

Also, use the dev_<fmt> functions instead of pr_<fmt> for logging.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Cc: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

2 files changed, 55 insertions, 149 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index af7444188f5c..7a8895396ecd 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -219,6 +219,7 @@ config MPCORE_WATCHDOG
 config EP93XX_WATCHDOG
         tristate "EP93xx Watchdog"
         depends on ARCH_EP93XX
+        select WATCHDOG_CORE
         help
           Say Y here if to include support for the watchdog timer
           embedded in the Cirrus Logic EP93xx family of devices.
diff --git a/drivers/watchdog/ep93xx_wdt.c b/drivers/watchdog/ep93xx_wdt.c
index bd01bde27c4a..414ce8fdecc9 100644
--- a/drivers/watchdog/ep93xx_wdt.c
+++ b/drivers/watchdog/ep93xx_wdt.c
@@ -8,6 +8,9 @@
  * Authors: Ray Lehtiniemi <rayl@mail.com>,
  *      Alessandro Zummo <a.zummo@towertech.it>
  *
+ * Copyright (c) 2012 H Hartley Sweeten <hsweeten@visionengravers.com>
+ *      Convert to a platform device and use the watchdog framework API
+ *
  * This file is licensed under the terms of the GNU General Public
  * License version 2. This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
@@ -23,33 +26,31 @@
  *      - Add a few missing ioctls
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
 #include <linux/platform_device.h>
 #include <linux/module.h>
-#include <linux/fs.h>
 #include <linux/miscdevice.h>
 #include <linux/watchdog.h>
 #include <linux/timer.h>
-#include <linux/uaccess.h>
 #include <linux/io.h>
 
-#define WDT_VERSION     "0.3"
+#define WDT_VERSION     "0.4"
 
 /* default timeout (secs) */
 #define WDT_TIMEOUT 30
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
+
 static int timeout = WDT_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+        "Watchdog timeout in seconds. (1<=timeout<=3600, default="
+                                __MODULE_STRING(WDT_TIMEOUT) ")");
 
 static void __iomem *mmio_base;
 static struct timer_list timer;
 static unsigned long next_heartbeat;
-static unsigned long wdt_status;
-static unsigned long boot_status;
-
-#define WDT_IN_USE              0
-#define WDT_OK_TO_CLOSE         1
 
 #define EP93XX_WATCHDOG         0x00
 #define EP93XX_WDSTATUS         0x04
@@ -57,155 +58,60 @@ static unsigned long boot_status;
 /* reset the wdt every ~200ms */
 #define WDT_INTERVAL (HZ/5)
 
-static void wdt_enable(void)
-{
-        writel(0xaaaa, mmio_base + EP93XX_WATCHDOG);
-}
-
-static void wdt_disable(void)
+static void ep93xx_wdt_timer_ping(unsigned long data)
 {
-        writel(0xaa55, mmio_base + EP93XX_WATCHDOG);
-}
+        if (time_before(jiffies, next_heartbeat))
+                writel(0x5555, mmio_base + EP93XX_WATCHDOG);
 
-static inline void wdt_ping(void)
-{
-        writel(0x5555, mmio_base + EP93XX_WATCHDOG);
+        /* Re-set the timer interval */
+        mod_timer(&timer, jiffies + WDT_INTERVAL);
 }
 
-static void wdt_startup(void)
+static int ep93xx_wdt_start(struct watchdog_device *wdd)
 {
         next_heartbeat = jiffies + (timeout * HZ);
 
-        wdt_enable();
+        writel(0xaaaa, mmio_base + EP93XX_WATCHDOG);
         mod_timer(&timer, jiffies + WDT_INTERVAL);
+
+        return 0;
 }
 
-static void wdt_shutdown(void)
+static int ep93xx_wdt_stop(struct watchdog_device *wdd)
 {
         del_timer_sync(&timer);
-        wdt_disable();
+        writel(0xaa55, mmio_base + EP93XX_WATCHDOG);
+
+        return 0;
 }
 
-static void wdt_keepalive(void)
+static int ep93xx_wdt_keepalive(struct watchdog_device *wdd)
 {
         /* user land ping */
         next_heartbeat = jiffies + (timeout * HZ);
-}
-
-static int ep93xx_wdt_open(struct inode *inode, struct file *file)
-{
-        if (test_and_set_bit(WDT_IN_USE, &wdt_status))
-                return -EBUSY;
-
-        clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-
-        wdt_startup();
-
-        return nonseekable_open(inode, file);
-}
-
-static ssize_t
-ep93xx_wdt_write(struct file *file, const char __user *data, size_t len,
-                 loff_t *ppos)
-{
-        if (len) {
-                if (!nowayout) {
-                        size_t i;
-
-                        clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-
-                        for (i = 0; i != len; i++) {
-                                char c;
 
-                                if (get_user(c, data + i))
-                                        return -EFAULT;
-
-                                if (c == 'V')
-                                        set_bit(WDT_OK_TO_CLOSE, &wdt_status);
-                                else
-                                        clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-                        }
-                }
-                wdt_keepalive();
-        }
-
-        return len;
+        return 0;
 }
 
-static const struct watchdog_info ident = {
-        .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE,
-        .identity = "EP93xx Watchdog",
+static const struct watchdog_info ep93xx_wdt_ident = {
+        .options        = WDIOF_CARDRESET |
+                          WDIOF_MAGICCLOSE |
+                          WDIOF_KEEPALIVEPING,
+        .identity       = "EP93xx Watchdog",
 };
 
-static long ep93xx_wdt_ioctl(struct file *file,
-                                        unsigned int cmd, unsigned long arg)
-{
-        int ret = -ENOTTY;
-
-        switch (cmd) {
-        case WDIOC_GETSUPPORT:
-                ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
-                                sizeof(ident)) ? -EFAULT : 0;
-                break;
-
-        case WDIOC_GETSTATUS:
-                ret = put_user(0, (int __user *)arg);
-                break;
-
-        case WDIOC_GETBOOTSTATUS:
-                ret = put_user(boot_status, (int __user *)arg);
-                break;
-
-        case WDIOC_KEEPALIVE:
-                wdt_keepalive();
-                ret = 0;
-                break;
-
-        case WDIOC_GETTIMEOUT:
-                /* actually, it is 0.250 seconds.... */
-                ret = put_user(1, (int __user *)arg);
-                break;
-        }
-        return ret;
-}
-
-static int ep93xx_wdt_release(struct inode *inode, struct file *file)
-{
-        if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
-                wdt_shutdown();
-        else
-                pr_crit("Device closed unexpectedly - timer will not stop\n");
-
-        clear_bit(WDT_IN_USE, &wdt_status);
-        clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-
-        return 0;
-}
-
-static const struct file_operations ep93xx_wdt_fops = {
+static struct watchdog_ops ep93xx_wdt_ops = {
         .owner          = THIS_MODULE,
-        .write          = ep93xx_wdt_write,
-        .unlocked_ioctl = ep93xx_wdt_ioctl,
-        .open           = ep93xx_wdt_open,
-        .release        = ep93xx_wdt_release,
-        .llseek         = no_llseek,
+        .start          = ep93xx_wdt_start,
+        .stop           = ep93xx_wdt_stop,
+        .ping           = ep93xx_wdt_keepalive,
 };
 
-static struct miscdevice ep93xx_wdt_miscdev = {
-        .minor          = WATCHDOG_MINOR,
-        .name           = "watchdog",
-        .fops           = &ep93xx_wdt_fops,
+static struct watchdog_device ep93xx_wdt_wdd = {
+        .info           = &ep93xx_wdt_ident,
+        .ops            = &ep93xx_wdt_ops,
 };
 
-static void ep93xx_timer_ping(unsigned long data)
-{
-        if (time_before(jiffies, next_heartbeat))
-                wdt_ping();
-
-        /* Re-set the timer interval */
-        mod_timer(&timer, jiffies + WDT_INTERVAL);
-}
-
 static int __devinit ep93xx_wdt_probe(struct platform_device *pdev)
 {
         struct resource *res;
@@ -226,26 +132,32 @@ static int __devinit ep93xx_wdt_probe(struct platform_device *pdev)
 
         if (timeout < 1 || timeout > 3600) {
                 timeout = WDT_TIMEOUT;
-                pr_info("timeout value must be 1<=x<=3600, using %d\n",
+                dev_warn(&pdev->dev,
+                        "timeout value must be 1<=x<=3600, using %d\n",
                         timeout);
         }
 
         val = readl(mmio_base + EP93XX_WATCHDOG);
-        boot_status = val & 0x01 ? 1 : 0;
+        ep93xx_wdt_wdd.bootstatus = (val & 0x01) ? WDIOF_CARDRESET : 0;
+
+        watchdog_set_nowayout(&ep93xx_wdt_wdd, nowayout);
 
-        setup_timer(&timer, ep93xx_timer_ping, 1);
+        setup_timer(&timer, ep93xx_wdt_timer_ping, 1);
 
-        err = misc_register(&ep93xx_wdt_miscdev);
+        err = watchdog_register_device(&ep93xx_wdt_wdd);
+        if (err)
+                return err;
 
-        pr_info("EP93XX watchdog, driver version " WDT_VERSION "%s\n",
+        dev_info(&pdev->dev,
+                "EP93XX watchdog, driver version " WDT_VERSION "%s\n",
                 (val & 0x08) ? " (nCS1 disable detected)" : "");
-        return err;
+
+        return 0;
 }
 
 static int __devexit ep93xx_wdt_remove(struct platform_device *pdev)
 {
-        wdt_shutdown();
-        misc_deregister(&ep93xx_wdt_miscdev);
+        watchdog_unregister_device(&ep93xx_wdt_wdd);
         return 0;
 }
 
@@ -260,16 +172,9 @@ static struct platform_driver ep93xx_wdt_driver = {
 
 module_platform_driver(ep93xx_wdt_driver);
 
-module_param(nowayout, bool, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
-
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout,
-        "Watchdog timeout in seconds. (1<=timeout<=3600, default="
-                                __MODULE_STRING(WDT_TIMEOUT) ")");
-
 MODULE_AUTHOR("Ray Lehtiniemi <rayl@mail.com>,"
-                "Alessandro Zummo <a.zummo@towertech.it>");
+                "Alessandro Zummo <a.zummo@towertech.it>,"
+                "H Hartley Sweeten <hsweeten@visionengravers.com>");
 MODULE_DESCRIPTION("EP93xx Watchdog");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(WDT_VERSION);