// SPDX-License-Identifier: GPL-2.0-or-later /* * W83977F Watchdog Timer Driver for Winbond W83977F I/O Chip * * (c) Copyright 2005 Jose Goncalves <[email protected]> * * Based on w83877f_wdt.c by Scott Jennings, * and wdt977.c by Woody Suwalski * * ----------------------- */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/watchdog.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/uaccess.h> #include <linux/io.h> #define WATCHDOG_VERSION … #define WATCHDOG_NAME … #define IO_INDEX_PORT … #define IO_DATA_PORT … #define UNLOCK_DATA … #define LOCK_DATA … #define DEVICE_REGISTER … #define DEFAULT_TIMEOUT … static int timeout = …; static int timeoutW; /* timeout in watchdog counter units */ static unsigned long timer_alive; static int testmode; static char expect_close; static DEFINE_SPINLOCK(spinlock); module_param(timeout, int, 0); MODULE_PARM_DESC(…) …; module_param(testmode, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; /* * Start the watchdog */ static int wdt_start(void) { … } /* * Stop the watchdog */ static int wdt_stop(void) { … } /* * Send a keepalive ping to the watchdog * This is done by simply re-writing the timeout to reg. 0xF2 */ static int wdt_keepalive(void) { … } /* * Set the watchdog timeout value */ static int wdt_set_timeout(int t) { … } /* * Get the watchdog status */ static int wdt_get_status(int *status) { … } /* * /dev/watchdog handling */ static int wdt_open(struct inode *inode, struct file *file) { … } static int wdt_release(struct inode *inode, struct file *file) { … } /* * wdt_write: * @file: file handle to the watchdog * @buf: buffer to write (unused as data does not matter here * @count: count of bytes * @ppos: pointer to the position to write. No seeks allowed * * A write to a watchdog device is defined as a keepalive signal. Any * write of data will do, as we don't define content meaning. */ static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { … } /* * wdt_ioctl: * @inode: inode of the device * @file: file handle to the device * @cmd: watchdog command * @arg: argument pointer * * The watchdog API defines a common set of functions for all watchdogs * according to their available features. */ static const struct watchdog_info ident = …; static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { … } static const struct file_operations wdt_fops = …; static struct miscdevice wdt_miscdev = …; static struct notifier_block wdt_notifier = …; static int __init w83977f_wdt_init(void) { … } static void __exit w83977f_wdt_exit(void) { … } module_init(…) …; module_exit(w83977f_wdt_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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