* which is based on wdt.c.
* Original copyright messages:
*
- * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
+ * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
*
* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
*
#define WATCHDOG_NAME "w83697hf/hg WDT"
#define PFX WATCHDOG_NAME ": "
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
+#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */
static unsigned long wdt_is_open;
static char expect_close;
-static spinlock_t io_lock;
+static DEFINE_SPINLOCK(io_lock);
/* You must set this - there is no sane way to probe for this board. */
static int wdt_io = 0x2e;
static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255 (default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+static int early_disable = WATCHDOG_EARLY_DISABLE;
+module_param(early_disable, int, 0);
+MODULE_PARM_DESC(early_disable, "Watchdog gets disabled at boot time (default=" __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
+
/*
* Kernel methods.
*/
w83697hf_deselect_wdt();
}
-static int
+static void
wdt_ping(void)
{
spin_lock(&io_lock);
w83697hf_deselect_wdt();
spin_unlock(&io_lock);
- return 0;
}
-static int
+static void
wdt_enable(void)
{
spin_lock(&io_lock);
w83697hf_deselect_wdt();
spin_unlock(&io_lock);
- return 0;
}
-static int
+static void
wdt_disable(void)
{
spin_lock(&io_lock);
w83697hf_deselect_wdt();
spin_unlock(&io_lock);
- return 0;
+}
+
+static unsigned char
+wdt_running(void)
+{
+ unsigned char t;
+
+ spin_lock(&io_lock);
+ w83697hf_select_wdt();
+
+ t = w83697hf_get_reg(0xF4); /* Read timer */
+
+ w83697hf_deselect_wdt();
+ spin_unlock(&io_lock);
+
+ return t;
}
static int
{
int ret, i, found = 0;
- spin_lock_init(&io_lock);
-
printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");
if (wdt_io == 0) {
}
w83697hf_init();
- wdt_disable(); /* Disable watchdog until first use */
+ if (early_disable) {
+ if (wdt_running())
+ printk (KERN_WARNING PFX "Stopping previously enabled watchdog until userland kicks in\n");
+ wdt_disable();
+ }
if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);