static void pc87413_disable(void) { unsigned int swc_base_addr; spin_lock(&io_lock); pc87413_select_wdt_out(); pc87413_enable_swc(); swc_base_addr = pc87413_get_swc_base(); pc87413_swc_bank3(swc_base_addr); pc87413_disable_sw_wd_tren(swc_base_addr); pc87413_disable_sw_wd_trg(swc_base_addr); pc87413_programm_wdto(swc_base_addr, 0); spin_unlock(&io_lock); }
static long pc87413_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int new_timeout; union { struct watchdog_info __user *ident; int __user *i; } uarg; static const struct watchdog_info ident = { .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = "PC87413(HF/F) watchdog", }; uarg.i = (int __user *)arg; switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(uarg.ident, &ident, sizeof(ident)) ? -EFAULT : 0; case WDIOC_GETSTATUS: return put_user(pc87413_status(), uarg.i); case WDIOC_GETBOOTSTATUS: return put_user(0, uarg.i); case WDIOC_SETOPTIONS: { int options, retval = -EINVAL; if (get_user(options, uarg.i)) return -EFAULT; if (options & WDIOS_DISABLECARD) { pc87413_disable(); retval = 0; } if (options & WDIOS_ENABLECARD) { pc87413_enable(); retval = 0; } return retval; } case WDIOC_KEEPALIVE: pc87413_refresh(); #ifdef DEBUG pr_info(DPFX "keepalive\n"); #endif return 0; case WDIOC_SETTIMEOUT: if (get_user(new_timeout, uarg.i)) return -EFAULT; /* the API states this is given in secs */ new_timeout /= 60; if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) return -EINVAL; timeout = new_timeout; pc87413_refresh(); /* fall through and return the new timeout... */ case WDIOC_GETTIMEOUT: new_timeout = timeout * 60; return put_user(new_timeout, uarg.i); default: return -ENOTTY; } } /* -- Notifier funtions -----------------------------------------*/ /** * notify_sys: * @this: our notifier block * @code: the event being reported * @unused: unused * * Our notifier is called on system shutdowns. We want to turn the card * off at reboot otherwise the machine will reboot again during memory * test or worse yet during the following fsck. This would suck, in fact * trust me - if it happens it does suck. */ static int pc87413_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) /* Turn the card off */ pc87413_disable(); return NOTIFY_DONE; } /* -- Module's structures ---------------------------------------*/ static const struct file_operations pc87413_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = pc87413_write, .unlocked_ioctl = pc87413_ioctl, .open = pc87413_open, .release = pc87413_release, }; static struct notifier_block pc87413_notifier = { .notifier_call = pc87413_notify_sys, }; static struct miscdevice pc87413_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &pc87413_fops, }; /* -- Module init functions -------------------------------------*/ /** * pc87413_init: module's "constructor" * * Set up the WDT watchdog board. All we have to do is grab the * resources we require and bitch if anyone beat us to them. * The open() function will actually kick the board off. */ static int __init pc87413_init(void) { int ret; pr_info("Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT); if (!request_muxed_region(io, 2, MODNAME)) return -EBUSY; ret = register_reboot_notifier(&pc87413_notifier); if (ret != 0) { pr_err("cannot register reboot notifier (err=%d)\n", ret); } ret = misc_register(&pc87413_miscdev); if (ret != 0) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); goto reboot_unreg; } pr_info("initialized. timeout=%d min\n", timeout); pc87413_select_wdt_out(); pc87413_enable_swc(); pc87413_get_swc_base_addr(); if (!request_region(swc_base_addr, 0x20, MODNAME)) { pr_err("cannot request SWC region at 0x%x\n", swc_base_addr); ret = -EBUSY; goto misc_unreg; } pc87413_enable(); release_region(io, 2); return 0; misc_unreg: misc_deregister(&pc87413_miscdev); reboot_unreg: unregister_reboot_notifier(&pc87413_notifier); release_region(io, 2); return ret; } /** * pc87413_exit: module's "destructor" * * Unload the watchdog. You cannot do this with any file handles open. * If your watchdog is set to continue ticking on close and you unload * it, well it keeps ticking. We won't get the interrupt but the board * will not touch PC memory so all is fine. You just have to load a new * module in 60 seconds or reboot. */ static void __exit pc87413_exit(void) { /* Stop the timer before we leave */ if (!nowayout) { pc87413_disable(); pr_info("Watchdog disabled\n"); } misc_deregister(&pc87413_miscdev); unregister_reboot_notifier(&pc87413_notifier); release_region(swc_base_addr, 0x20); pr_info("watchdog component driver removed\n"); } module_init(pc87413_init); module_exit(pc87413_exit); MODULE_AUTHOR("Sven Anders <*****@*****.**>, " "Marcus Junker <*****@*****.**>,"); MODULE_DESCRIPTION("PC87413 WDT driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); module_param(io, int, 0); MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(IO_DEFAULT) ")."); module_param(timeout, int, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")."); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");