// SPDX-License-Identifier: GPL-2.0-or-later /* * Watchdog Timer Driver * for ITE IT87xx Environment Control - Low Pin Count Input / Output * * (c) Copyright 2007 Oliver Schuster <[email protected]> * * Based on softdog.c by Alan Cox, * 83977f_wdt.c by Jose Goncalves, * it87.c by Chris Gauthron, Jean Delvare * * Data-sheets: Publicly available at the ITE website * http://www.ite.com.tw/ * * Support of the watchdog timers, which are available on * IT8607, IT8613, IT8620, IT8622, IT8625, IT8628, IT8655, IT8659, * IT8665, IT8686, IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, * IT8726, IT8728, IT8772, IT8783, IT8784 and IT8786. */ #define pr_fmt(fmt) … #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/watchdog.h> #define WATCHDOG_NAME … /* Defaults for Module Parameter */ #define DEFAULT_TIMEOUT … #define DEFAULT_TESTMODE … #define DEFAULT_NOWAYOUT … /* IO Ports */ #define REG … #define VAL … /* Logical device Numbers LDN */ #define GPIO … /* Configuration Registers and Functions */ #define LDNREG … #define CHIPID … #define CHIPREV … /* Chip Id numbers */ #define NO_DEV_ID … #define IT8607_ID … #define IT8613_ID … #define IT8620_ID … #define IT8622_ID … #define IT8625_ID … #define IT8628_ID … #define IT8655_ID … #define IT8659_ID … #define IT8665_ID … #define IT8686_ID … #define IT8702_ID … #define IT8705_ID … #define IT8712_ID … #define IT8716_ID … #define IT8718_ID … #define IT8720_ID … #define IT8721_ID … #define IT8726_ID … #define IT8728_ID … #define IT8772_ID … #define IT8783_ID … #define IT8784_ID … #define IT8786_ID … /* GPIO Configuration Registers LDN=0x07 */ #define WDTCTRL … #define WDTCFG … #define WDTVALLSB … #define WDTVALMSB … /* GPIO Bits WDTCFG */ #define WDT_TOV1 … #define WDT_KRST … #define WDT_TOVE … #define WDT_PWROK … #define WDT_INT_MASK … static unsigned int max_units, chip_type; static unsigned int timeout = …; static int testmode = …; static bool nowayout = … DEFAULT_NOWAYOUT; module_param(timeout, int, 0); MODULE_PARM_DESC(…) …; module_param(testmode, int, 0); MODULE_PARM_DESC(…) …; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; /* Superio Chip */ static inline int superio_enter(void) { … } static inline void superio_exit(void) { … } static inline void superio_select(int ldn) { … } static inline int superio_inb(int reg) { … } static inline void superio_outb(int val, int reg) { … } static inline int superio_inw(int reg) { … } /* Internal function, should be called after superio_select(GPIO) */ static void _wdt_update_timeout(unsigned int t) { … } static int wdt_update_timeout(unsigned int t) { … } static int wdt_round_time(int t) { … } /* watchdog timer handling */ static int wdt_start(struct watchdog_device *wdd) { … } static int wdt_stop(struct watchdog_device *wdd) { … } /** * wdt_set_timeout - set a new timeout value with watchdog ioctl * @wdd: pointer to the watchdog_device structure * @t: timeout value in seconds * * The hardware device has a 8 or 16 bit watchdog timer (depends on * chip version) that can be configured to count seconds or minutes. * * Used within WDIOC_SETTIMEOUT watchdog device ioctl. * * Return: 0 if the timeout was set successfully, or a negative error code on * failure. */ static int wdt_set_timeout(struct watchdog_device *wdd, unsigned int t) { … } static const struct watchdog_info ident = …; static const struct watchdog_ops wdt_ops = …; static struct watchdog_device wdt_dev = …; static int __init it87_wdt_init(void) { … } static void __exit it87_wdt_exit(void) { … } module_init(…) …; module_exit(it87_wdt_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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