// SPDX-License-Identifier: GPL-2.0-or-later /* * National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver * (c) Copyright 2002 Zwane Mwaikambo <[email protected]>, * All Rights Reserved. * Based on wdt.c and wdt977.c by Alan Cox and Woody Suwalski respectively. * * The author(s) of this software shall not be held liable for damages * of any nature resulting due to the use of this software. This * software is provided AS-IS with no warranties. * * Changelog: * 20020220 Zwane Mwaikambo Code based on datasheet, no hardware. * 20020221 Zwane Mwaikambo Cleanups as suggested by Jeff Garzik * and Alan Cox. * 20020222 Zwane Mwaikambo Added probing. * 20020225 Zwane Mwaikambo Added ISAPNP support. * 20020412 Rob Radez Broke out start/stop functions * <[email protected]> Return proper status instead of * temperature warning * Add WDIOC_GETBOOTSTATUS and * WDIOC_SETOPTIONS ioctls * Fix CONFIG_WATCHDOG_NOWAYOUT * 20020530 Joel Becker Add Matt Domsch's nowayout module * option * 20030116 Adam Belay Updated to the latest pnp code */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/ioport.h> #include <linux/spinlock.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/init.h> #include <linux/pnp.h> #include <linux/fs.h> #include <linux/semaphore.h> #include <linux/io.h> #include <linux/uaccess.h> #define SC1200_MODULE_VER … #define SC1200_MODULE_NAME … #define MAX_TIMEOUT … #define PMIR … #define PMDR … /* Data Register indexes */ #define FER1 … #define FER2 … #define PMC1 … #define PMC2 … #define PMC3 … #define WDTO … #define WDCF … #define WDST … /* WDCF bitfields - which devices assert WDO */ #define KBC_IRQ … #define MSE_IRQ … #define UART1_IRQ … #define UART2_IRQ … /* 5 -7 are reserved */ static int timeout = …; static int io = …; static int io_len = …; /* for non plug and play */ static unsigned long open_flag; static char expect_close; static DEFINE_SPINLOCK(sc1200wdt_lock); /* io port access serialisation */ #if defined CONFIG_PNP static int isapnp = …; static struct pnp_dev *wdt_dev; module_param(isapnp, int, 0); MODULE_PARM_DESC(…) …; #endif module_param_hw(io, int, ioport, 0); MODULE_PARM_DESC(…) …; module_param(timeout, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; /* Read from Data Register */ static inline void __sc1200wdt_read_data(unsigned char index, unsigned char *data) { … } static void sc1200wdt_read_data(unsigned char index, unsigned char *data) { … } /* Write to Data Register */ static inline void __sc1200wdt_write_data(unsigned char index, unsigned char data) { … } static inline void sc1200wdt_write_data(unsigned char index, unsigned char data) { … } static void sc1200wdt_start(void) { … } static void sc1200wdt_stop(void) { … } /* This returns the status of the WDO signal, inactive high. */ static inline int sc1200wdt_status(void) { … } static int sc1200wdt_open(struct inode *inode, struct file *file) { … } static long sc1200wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } static int sc1200wdt_release(struct inode *inode, struct file *file) { … } static ssize_t sc1200wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { … } static int sc1200wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { … } static struct notifier_block sc1200wdt_notifier = …; static const struct file_operations sc1200wdt_fops = …; static struct miscdevice sc1200wdt_miscdev = …; static int __init sc1200wdt_probe(void) { … } #if defined CONFIG_PNP static const struct pnp_device_id scl200wdt_pnp_devices[] = …; static int scl200wdt_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) { … } static void scl200wdt_pnp_remove(struct pnp_dev *dev) { … } static struct pnp_driver scl200wdt_pnp_driver = …; #endif /* CONFIG_PNP */ static int __init sc1200wdt_init(void) { … } static void __exit sc1200wdt_exit(void) { … } module_init(…) …; module_exit(sc1200wdt_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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