Merge branch 'stable/for-jens-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / include / linux / watchdog.h

diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index ac40716..da70f0f 100644 (file)
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -45,6 +45,8 @@ struct watchdog_info {
 #define        WDIOF_SETTIMEOUT        0x0080  /* Set timeout (in seconds) */
 #define        WDIOF_MAGICCLOSE        0x0100  /* Supports magic close char */
 #define        WDIOF_PRETIMEOUT        0x0200  /* Pretimeout (in seconds), get/set */
+#define        WDIOF_ALARMONLY         0x0400  /* Watchdog triggers a management or
+                                          other external alarm not a reboot */
 #define        WDIOF_KEEPALIVEPING     0x8000  /* Keep alive ping reply */
 
 #define        WDIOS_DISABLECARD       0x0001  /* Turn off the watchdog timer */
@@ -54,6 +56,8 @@ struct watchdog_info {
 #ifdef __KERNEL__
 
 #include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
 
 struct watchdog_ops;
 struct watchdog_device;
@@ -67,6 +71,8 @@ struct 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.
+ * @ref:       The ref operation for dyn. allocated watchdog_device structs
+ * @unref:     The unref operation for dyn. allocated watchdog_device structs
  * @ioctl:     The routines that handles extra ioctl calls.
  *
  * The watchdog_ops structure contains a list of low-level operations
@@ -84,11 +90,17 @@ struct watchdog_ops {
        unsigned int (*status)(struct watchdog_device *);
        int (*set_timeout)(struct watchdog_device *, unsigned int);
        unsigned int (*get_timeleft)(struct watchdog_device *);
+       void (*ref)(struct watchdog_device *);
+       void (*unref)(struct watchdog_device *);
        long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
 };
 
 /** struct watchdog_device - The structure that defines a watchdog device
  *
+ * @id:                The watchdog's ID. (Allocated by watchdog_register_device)
+ * @cdev:      The watchdog's Character device.
+ * @dev:       The device for our watchdog
+ * @parent:    The parent bus device
  * @info:      Pointer to a watchdog_info structure.
  * @ops:       Pointer to the list of watchdog operations.
  * @bootstatus:        Status of the watchdog device at boot.
@@ -96,6 +108,7 @@ struct watchdog_ops {
  * @min_timeout:The watchdog devices minimum timeout value.
  * @max_timeout:The watchdog devices maximum timeout value.
  * @driver-data:Pointer to the drivers private data.
+ * @lock:      Lock for watchdog core internal use only.
  * @status:    Field that contains the devices internal status bits.
  *
  * The watchdog_device structure contains all information about a
@@ -103,8 +116,15 @@ struct watchdog_ops {
  *
  * The driver-data field may not be accessed directly. It must be accessed
  * via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
+ *
+ * The lock field is for watchdog core internal use only and should not be
+ * touched.
  */
 struct watchdog_device {
+       int id;
+       struct cdev cdev;
+       struct device *dev;
+       struct device *parent;
        const struct watchdog_info *info;
        const struct watchdog_ops *ops;
        unsigned int bootstatus;
@@ -112,12 +132,14 @@ struct watchdog_device {
        unsigned int min_timeout;
        unsigned int max_timeout;
        void *driver_data;
+       struct mutex lock;
        unsigned long status;
 /* Bit numbers for status flags */
 #define WDOG_ACTIVE            0       /* Is the watchdog running/active */
 #define WDOG_DEV_OPEN          1       /* Opened via /dev/watchdog ? */
 #define WDOG_ALLOW_RELEASE     2       /* Did we receive the magic char ? */
 #define WDOG_NO_WAY_OUT                3       /* Is 'nowayout' feature set ? */
+#define WDOG_UNREGISTERED      4       /* Has the device been unregistered */
 };
 
 #ifdef CONFIG_WATCHDOG_NOWAYOUT
@@ -128,6 +150,12 @@ struct watchdog_device {
 #define WATCHDOG_NOWAYOUT_INIT_STATUS  0
 #endif
 
+/* Use the following function to check wether or not the watchdog is active */
+static inline bool watchdog_active(struct watchdog_device *wdd)
+{
+       return test_bit(WDOG_ACTIVE, &wdd->status);
+}
+
 /* Use the following function to set the nowayout feature */
 static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout)
 {