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authorViresh Kumar <viresh.kumar@st.com>2012-03-16 09:14:00 +0100
committerWim Van Sebroeck <wim@iguana.be>2012-03-27 20:15:37 +0200
commitfd7b673c92731fc6c0b1e999adfd87b6762ee797 (patch)
tree35fafd733a2846acb1dd7a06cb7078a7fe59086f
parent2ca1606359695cc7ce371c7829c4082d9095fc06 (diff)
watchdog: Add support for WDIOC_GETTIMELEFT IOCTL in watchdog core
This patch adds support for WDIOC_GETTIMELEFT IOCTL in watchdog core. So, there is another function pointer added to struct watchdog_ops, which can be passed by drivers to support this IOCTL. Related documentation is updated too. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
-rw-r--r--Documentation/watchdog/convert_drivers_to_kernel_api.txt4
-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt4
-rw-r--r--drivers/watchdog/watchdog_dev.c5
-rw-r--r--include/linux/watchdog.h2
4 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/watchdog/convert_drivers_to_kernel_api.txt b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
index be8119bb15d2..271b8850dde7 100644
--- a/Documentation/watchdog/convert_drivers_to_kernel_api.txt
+++ b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
@@ -59,6 +59,10 @@ Here is a overview of the functions and probably needed actions:
WDIOC_GETTIMEOUT:
No preparations needed
+ WDIOC_GETTIMELEFT:
+ It needs get_timeleft() callback to be defined. Otherwise it
+ will return EOPNOTSUPP
+
Other IOCTLs can be served using the ioctl-callback. Note that this is mainly
intended for porting old drivers; new drivers should not invent private IOCTLs.
Private IOCTLs are processed first. When the callback returns with
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 7d9d1da762b6..227f6cd0e5fa 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -1,6 +1,6 @@
The Linux WatchDog Timer Driver Core kernel API.
===============================================
-Last reviewed: 29-Nov-2011
+Last reviewed: 16-Mar-2012
Wim Van Sebroeck <wim@iguana.be>
@@ -77,6 +77,7 @@ struct watchdog_ops {
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
+ unsigned int (*get_timeleft)(struct watchdog_device *);
long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
};
@@ -123,6 +124,7 @@ they are supported. These optional routines/operations are:
because the watchdog does not necessarily has a 1 second resolution).
(Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the
watchdog's info structure).
+* get_timeleft: this routines returns the time that's left before a reset.
* ioctl: if this routine is present then it will be called first before we do
our own internal ioctl call handling. This routine should return -ENOIOCTLCMD
if a command is not supported. The parameters that are passed to the ioctl
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index c6e1b8dd80cc..8558da912c42 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -236,6 +236,11 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
if (wdd->timeout == 0)
return -EOPNOTSUPP;
return put_user(wdd->timeout, p);
+ case WDIOC_GETTIMELEFT:
+ if (!wdd->ops->get_timeleft)
+ return -EOPNOTSUPP;
+
+ return put_user(wdd->ops->get_timeleft(wdd), p);
default:
return -ENOTTY;
}
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index de75167093bf..ac40716b44e9 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -66,6 +66,7 @@ struct watchdog_device;
* @ping: The routine that sends a keepalive ping to the watchdog device.
* @status: The routine that shows the status of the watchdog device.
* @set_timeout:The routine for setting the watchdog devices timeout value.
+ * @get_timeleft:The routine that get's the time that's left before a reset.
* @ioctl: The routines that handles extra ioctl calls.
*
* The watchdog_ops structure contains a list of low-level operations
@@ -82,6 +83,7 @@ struct watchdog_ops {
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
+ unsigned int (*get_timeleft)(struct watchdog_device *);
long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
};