watchdog: at91sam9_wdt: Convert to use the watchdog framework
According to Documentation/watchdog/convert_drivers_to_kernel_api.txt,
remove the file_operations struct, miscdevice, and obsolete includes
Since the at91sam watchdog inherent characteristics, add the watchdog
operations: at91wdt_start, at91wdt_stop and at91wdt_ping.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: linux-watchdog@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index f3aae8c..83ac1f7 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -125,6 +125,7 @@
config AT91SAM9X_WATCHDOG
tristate "AT91SAM9X / AT91CAP9 watchdog"
depends on ARCH_AT91 && !ARCH_AT91RM9200
+ select WATCHDOG_CORE
help
Watchdog timer embedded into AT91SAM9X and AT91CAP9 chips. This will
reboot your system when the timeout is reached.
diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
index feb203f..8038b20 100644
--- a/drivers/watchdog/at91sam9_wdt.c
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -18,11 +18,9 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/errno.h>
-#include <linux/fs.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
-#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
@@ -68,19 +66,17 @@
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+static struct watchdog_device at91_wdt_dev;
static void at91_ping(unsigned long data);
static struct {
void __iomem *base;
unsigned long next_heartbeat; /* the next_heartbeat for the timer */
- unsigned long open;
- char expect_close;
struct timer_list timer; /* The timer that pings the watchdog */
} at91wdt_private;
/* ......................................................................... */
-
/*
* Reload the watchdog timer. (ie, pat the watchdog)
*/
@@ -95,39 +91,37 @@
static void at91_ping(unsigned long data)
{
if (time_before(jiffies, at91wdt_private.next_heartbeat) ||
- (!nowayout && !at91wdt_private.open)) {
+ (!watchdog_active(&at91_wdt_dev))) {
at91_wdt_reset();
mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
} else
pr_crit("I will reset your machine !\n");
}
-/*
- * Watchdog device is opened, and watchdog starts running.
- */
-static int at91_wdt_open(struct inode *inode, struct file *file)
+static int at91_wdt_ping(struct watchdog_device *wdd)
{
- if (test_and_set_bit(0, &at91wdt_private.open))
- return -EBUSY;
-
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
- mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
-
- return nonseekable_open(inode, file);
+ /* calculate when the next userspace timeout will be */
+ at91wdt_private.next_heartbeat = jiffies + wdd->timeout * HZ;
+ return 0;
}
-/*
- * Close the watchdog device.
- */
-static int at91_wdt_close(struct inode *inode, struct file *file)
+static int at91_wdt_start(struct watchdog_device *wdd)
{
- clear_bit(0, &at91wdt_private.open);
+ /* calculate the next userspace timeout and modify the timer */
+ at91_wdt_ping(wdd);
+ mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
+ return 0;
+}
- /* stop internal ping */
- if (!at91wdt_private.expect_close)
- del_timer(&at91wdt_private.timer);
+static int at91_wdt_stop(struct watchdog_device *wdd)
+{
+ /* The watchdog timer hardware can not be stopped... */
+ return 0;
+}
- at91wdt_private.expect_close = 0;
+static int at91_wdt_set_timeout(struct watchdog_device *wdd, unsigned int new_timeout)
+{
+ wdd->timeout = new_timeout;
return 0;
}
@@ -163,96 +157,27 @@
return 0;
}
+/* ......................................................................... */
+
static const struct watchdog_info at91_wdt_info = {
.identity = DRV_NAME,
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
};
-/*
- * Handle commands from user-space.
- */
-static long at91_wdt_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_value;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &at91_wdt_info,
- sizeof(at91_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_KEEPALIVE:
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_value, p))
- return -EFAULT;
-
- heartbeat = new_value;
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
-
- return put_user(new_value, p); /* return current value */
-
- case WDIOC_GETTIMEOUT:
- return put_user(heartbeat, p);
- }
- return -ENOTTY;
-}
-
-/*
- * Pat the watchdog whenever device is written to.
- */
-static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len,
- loff_t *ppos)
-{
- if (!len)
- return 0;
-
- /* Scan for magic character */
- if (!nowayout) {
- size_t i;
-
- at91wdt_private.expect_close = 0;
-
- for (i = 0; i < len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V') {
- at91wdt_private.expect_close = 42;
- break;
- }
- }
- }
-
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
-
- return len;
-}
-
-/* ......................................................................... */
-
-static const struct file_operations at91wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .unlocked_ioctl = at91_wdt_ioctl,
- .open = at91_wdt_open,
- .release = at91_wdt_close,
- .write = at91_wdt_write,
+static const struct watchdog_ops at91_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = at91_wdt_start,
+ .stop = at91_wdt_stop,
+ .ping = at91_wdt_ping,
+ .set_timeout = at91_wdt_set_timeout,
};
-static struct miscdevice at91wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &at91wdt_fops,
+static struct watchdog_device at91_wdt_dev = {
+ .info = &at91_wdt_info,
+ .ops = &at91_wdt_ops,
+ .min_timeout = 1,
+ .max_timeout = 0xFFFF,
};
static int __init at91wdt_probe(struct platform_device *pdev)
@@ -260,10 +185,6 @@
struct resource *r;
int res;
- if (at91wdt_miscdev.parent)
- return -EBUSY;
- at91wdt_miscdev.parent = &pdev->dev;
-
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENODEV;
@@ -273,16 +194,20 @@
return -ENOMEM;
}
+ at91_wdt_dev.timeout = heartbeat;
+ at91_wdt_dev.parent = &pdev->dev;
+ watchdog_set_nowayout(&at91_wdt_dev, nowayout);
+
/* Set watchdog */
res = at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
if (res)
return res;
- res = misc_register(&at91wdt_miscdev);
+ res = watchdog_register_device(&at91_wdt_dev);
if (res)
return res;
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+ at91wdt_private.next_heartbeat = jiffies + at91_wdt_dev.timeout * HZ;
setup_timer(&at91wdt_private.timer, at91_ping, 0);
mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
@@ -294,13 +219,12 @@
static int __exit at91wdt_remove(struct platform_device *pdev)
{
- int res;
+ watchdog_unregister_device(&at91_wdt_dev);
- res = misc_deregister(&at91wdt_miscdev);
- if (!res)
- at91wdt_miscdev.parent = NULL;
+ pr_warn("I quit now, hardware will probably reboot!\n");
+ del_timer(&at91wdt_private.timer);
- return res;
+ return 0;
}
#if defined(CONFIG_OF)
@@ -326,4 +250,3 @@
MODULE_AUTHOR("Renaud CERRATO <r.cerrato@til-technologies.fr>");
MODULE_DESCRIPTION("Watchdog driver for Atmel AT91SAM9x processors");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);