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TOMOYO Linux Cross Reference
Linux/include/linux/watchdog.h

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  1 /*
  2  *      Generic watchdog defines. Derived from..
  3  *
  4  * Berkshire PC Watchdog Defines
  5  * by Ken Hollis <khollis@bitgate.com>
  6  *
  7  */
  8 #ifndef _LINUX_WATCHDOG_H
  9 #define _LINUX_WATCHDOG_H
 10 
 11 
 12 #include <linux/bitops.h>
 13 #include <linux/device.h>
 14 #include <linux/cdev.h>
 15 #include <uapi/linux/watchdog.h>
 16 
 17 struct watchdog_ops;
 18 struct watchdog_device;
 19 
 20 /** struct watchdog_ops - The watchdog-devices operations
 21  *
 22  * @owner:      The module owner.
 23  * @start:      The routine for starting the watchdog device.
 24  * @stop:       The routine for stopping the watchdog device.
 25  * @ping:       The routine that sends a keepalive ping to the watchdog device.
 26  * @status:     The routine that shows the status of the watchdog device.
 27  * @set_timeout:The routine for setting the watchdog devices timeout value.
 28  * @get_timeleft:The routine that get's the time that's left before a reset.
 29  * @ref:        The ref operation for dyn. allocated watchdog_device structs
 30  * @unref:      The unref operation for dyn. allocated watchdog_device structs
 31  * @ioctl:      The routines that handles extra ioctl calls.
 32  *
 33  * The watchdog_ops structure contains a list of low-level operations
 34  * that control a watchdog device. It also contains the module that owns
 35  * these operations. The start and stop function are mandatory, all other
 36  * functions are optonal.
 37  */
 38 struct watchdog_ops {
 39         struct module *owner;
 40         /* mandatory operations */
 41         int (*start)(struct watchdog_device *);
 42         int (*stop)(struct watchdog_device *);
 43         /* optional operations */
 44         int (*ping)(struct watchdog_device *);
 45         unsigned int (*status)(struct watchdog_device *);
 46         int (*set_timeout)(struct watchdog_device *, unsigned int);
 47         unsigned int (*get_timeleft)(struct watchdog_device *);
 48         void (*ref)(struct watchdog_device *);
 49         void (*unref)(struct watchdog_device *);
 50         long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
 51 };
 52 
 53 /** struct watchdog_device - The structure that defines a watchdog device
 54  *
 55  * @id:         The watchdog's ID. (Allocated by watchdog_register_device)
 56  * @cdev:       The watchdog's Character device.
 57  * @dev:        The device for our watchdog
 58  * @parent:     The parent bus device
 59  * @info:       Pointer to a watchdog_info structure.
 60  * @ops:        Pointer to the list of watchdog operations.
 61  * @bootstatus: Status of the watchdog device at boot.
 62  * @timeout:    The watchdog devices timeout value.
 63  * @min_timeout:The watchdog devices minimum timeout value.
 64  * @max_timeout:The watchdog devices maximum timeout value.
 65  * @driver-data:Pointer to the drivers private data.
 66  * @lock:       Lock for watchdog core internal use only.
 67  * @status:     Field that contains the devices internal status bits.
 68  *
 69  * The watchdog_device structure contains all information about a
 70  * watchdog timer device.
 71  *
 72  * The driver-data field may not be accessed directly. It must be accessed
 73  * via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
 74  *
 75  * The lock field is for watchdog core internal use only and should not be
 76  * touched.
 77  */
 78 struct watchdog_device {
 79         int id;
 80         struct cdev cdev;
 81         struct device *dev;
 82         struct device *parent;
 83         const struct watchdog_info *info;
 84         const struct watchdog_ops *ops;
 85         unsigned int bootstatus;
 86         unsigned int timeout;
 87         unsigned int min_timeout;
 88         unsigned int max_timeout;
 89         void *driver_data;
 90         struct mutex lock;
 91         unsigned long status;
 92 /* Bit numbers for status flags */
 93 #define WDOG_ACTIVE             0       /* Is the watchdog running/active */
 94 #define WDOG_DEV_OPEN           1       /* Opened via /dev/watchdog ? */
 95 #define WDOG_ALLOW_RELEASE      2       /* Did we receive the magic char ? */
 96 #define WDOG_NO_WAY_OUT         3       /* Is 'nowayout' feature set ? */
 97 #define WDOG_UNREGISTERED       4       /* Has the device been unregistered */
 98 };
 99 
100 #ifdef CONFIG_WATCHDOG_NOWAYOUT
101 #define WATCHDOG_NOWAYOUT               1
102 #define WATCHDOG_NOWAYOUT_INIT_STATUS   (1 << WDOG_NO_WAY_OUT)
103 #else
104 #define WATCHDOG_NOWAYOUT               0
105 #define WATCHDOG_NOWAYOUT_INIT_STATUS   0
106 #endif
107 
108 /* Use the following function to check wether or not the watchdog is active */
109 static inline bool watchdog_active(struct watchdog_device *wdd)
110 {
111         return test_bit(WDOG_ACTIVE, &wdd->status);
112 }
113 
114 /* Use the following function to set the nowayout feature */
115 static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout)
116 {
117         if (nowayout)
118                 set_bit(WDOG_NO_WAY_OUT, &wdd->status);
119 }
120 
121 /* Use the following functions to manipulate watchdog driver specific data */
122 static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
123 {
124         wdd->driver_data = data;
125 }
126 
127 static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
128 {
129         return wdd->driver_data;
130 }
131 
132 /* drivers/watchdog/core/watchdog_core.c */
133 extern int watchdog_register_device(struct watchdog_device *);
134 extern void watchdog_unregister_device(struct watchdog_device *);
135 
136 #endif  /* ifndef _LINUX_WATCHDOG_H */
137 

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