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watchdog: Add WDIOC_GETTIMELEFT ioctl support to w83627 watchdog driver 

Add WDIOC_GETTIMELEFT ioctl allowing you to check how much time is left
on the watchdog counter before a reset occurs.

Signed-off-by: Greg Lee <glee [at] swspec.com>
Signed-off-by: Padraig Brady <P@draigbrady.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@google.com>
This commit is contained in:
Greg Lee 2011-09-12 20:28:46 -04:00 committed by Wim Van Sebroeck
parent 86b5912880
commit c63b6d02be
1 changed files with 27 additions and 6 deletions
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33
drivers/watchdog/w83627hf_wdt.c
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@ -142,7 +142,7 @@ static void w83627hf_init(void)
w83627hf_unselect_wd_register();
}
static void wdt_ctrl(int timeout)
static void wdt_set_time(int timeout)
{
spin_lock(&io_lock);
@ -158,13 +158,13 @@ static void wdt_ctrl(int timeout)
static int wdt_ping(void)
{
wdt_ctrl(timeout);
wdt_set_time(timeout);
return 0;
}
static int wdt_disable(void)
{
wdt_ctrl(0);
wdt_set_time(0);
return 0;
}
@ -176,6 +176,24 @@ static int wdt_set_heartbeat(int t)
return 0;
}
static int wdt_get_time(void)
{
int timeleft;
spin_lock(&io_lock);
w83627hf_select_wd_register();
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
timeleft = inb_p(WDT_EFDR); /* Read Timeout counter to CRF6 */
w83627hf_unselect_wd_register();
spin_unlock(&io_lock);
return timeleft;
}
static ssize_t wdt_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -202,7 +220,7 @@ static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_timeout;
int timeval;
static const struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
@ -238,14 +256,17 @@ static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
wdt_ping();
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, p))
if (get_user(timeval, p))
return -EFAULT;
if (wdt_set_heartbeat(new_timeout))
if (wdt_set_heartbeat(timeval))
return -EINVAL;
wdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
case WDIOC_GETTIMELEFT:
timeval = wdt_get_time();
return put_user(timeval, p);
default:
return -ENOTTY;
}