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[WATCHDOG] mv64x60_wdt: Support the WDIOF_MAGICCLOSE feature

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Disallow disabling of the watchdog timer unless a particular
character ('V') was recently written to the watchdog device.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Dale Farnsworth 2007-07-24 11:18:14 -07:00 committed by Wim Van Sebroeck
parent d37a5c3ddf
commit bf2fc92cae
1 changed files with 24 additions and 4 deletions
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28
drivers/char/watchdog/mv64x60_wdt.c
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@ -44,6 +44,7 @@ static int wdt_status;
static void __iomem *mv64x60_wdt_regs;
static int mv64x60_wdt_timeout;
static unsigned int bus_clk;
static char expect_close;
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
@ -115,10 +116,14 @@ static int mv64x60_wdt_open(struct inode *inode, struct file *file)
static int mv64x60_wdt_release(struct inode *inode, struct file *file)
{
mv64x60_wdt_service();
if (!nowayout)
if (expect_close == 42)
mv64x60_wdt_handler_disable();
else {
printk(KERN_CRIT
"mv64x60_wdt: unexpected close, not stopping timer!\n");
mv64x60_wdt_service();
}
expect_close = 0;
clear_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags);
@ -128,8 +133,22 @@ static int mv64x60_wdt_release(struct inode *inode, struct file *file)
static ssize_t mv64x60_wdt_write(struct file *file, const char __user *data,
size_t len, loff_t * ppos)
{
if (len)
if (len) {
if (!nowayout) {
size_t i;
expect_close = 0;
for (i = 0; i != len; i++) {
char c;
if(get_user(c, data + i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
}
}
mv64x60_wdt_service();
}
return len;
}
@ -142,6 +161,7 @@ static int mv64x60_wdt_ioctl(struct inode *inode, struct file *file,
void __user *argp = (void __user *)arg;
static struct watchdog_info info = {
.options = WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE |
WDIOF_KEEPALIVEPING,
.firmware_version = 0,
.identity = "MV64x60 watchdog",