static void w83697hf_select_wdt(void) { w83697hf_unlock(); w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */ }
static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; int new_timeout; static struct watchdog_info ident = { .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = "W83697HF WDT", }; switch (cmd) { case WDIOC_GETSUPPORT: if (copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; break; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_KEEPALIVE: wdt_ping(); break; case WDIOC_SETTIMEOUT: if (get_user(new_timeout, p)) return -EFAULT; if (wdt_set_heartbeat(new_timeout)) return -EINVAL; wdt_ping(); /* Fall */ case WDIOC_GETTIMEOUT: return put_user(timeout, p); case WDIOC_SETOPTIONS: { int options, retval = -EINVAL; if (get_user(options, p)) return -EFAULT; if (options & WDIOS_DISABLECARD) { wdt_disable(); retval = 0; } if (options & WDIOS_ENABLECARD) { wdt_enable(); retval = 0; } return retval; } default: return -ENOTTY; } return 0; } static int wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(0, &wdt_is_open)) return -EBUSY; /* * Activate */ wdt_enable(); return nonseekable_open(inode, file); } static int wdt_close(struct inode *inode, struct file *file) { if (expect_close == 42) { wdt_disable(); } else { printk (KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); wdt_ping(); } expect_close = 0; clear_bit(0, &wdt_is_open); return 0; } /* * Notifier for system down */ static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) { /* Turn the WDT off */ wdt_disable(); } return NOTIFY_DONE; } /* * Kernel Interfaces */ static const struct file_operations wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = wdt_write, .ioctl = wdt_ioctl, .open = wdt_open, .release = wdt_close, }; static struct miscdevice wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &wdt_fops, }; /* * The WDT needs to learn about soft shutdowns in order to * turn the timebomb registers off. */ static struct notifier_block wdt_notifier = { .notifier_call = wdt_notify_sys, }; static int w83697hf_check_wdt(void) { if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { printk (KERN_ERR PFX "I/O address 0x%x already in use\n", wdt_io); return -EIO; } printk (KERN_DEBUG PFX "Looking for watchdog at address 0x%x\n", wdt_io); w83697hf_unlock(); if (w83697hf_get_reg(0x20) == 0x60) { printk (KERN_INFO PFX "watchdog found at address 0x%x\n", wdt_io); w83697hf_lock(); return 0; } w83697hf_lock(); /* Reprotect in case it was a compatible device */ printk (KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io); release_region(wdt_io, 2); return -EIO; } static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 }; static int __init wdt_init(void) { int ret, i, found = 0; printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n"); if (wdt_io == 0) { /* we will autodetect the W83697HF/HG watchdog */ for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) { wdt_io = w83697hf_ioports[i]; if (!w83697hf_check_wdt()) found++; } } else { if (!w83697hf_check_wdt()) found++; } if (!found) { printk (KERN_ERR PFX "No W83697HF/HG could be found\n"); ret = -EIO; goto out; } w83697hf_init(); if (early_disable) { if (wdt_running()) printk (KERN_WARNING PFX "Stopping previously enabled watchdog until userland kicks in\n"); wdt_disable(); } if (wdt_set_heartbeat(timeout)) { wdt_set_heartbeat(WATCHDOG_TIMEOUT); printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n", WATCHDOG_TIMEOUT); } ret = register_reboot_notifier(&wdt_notifier); if (ret != 0) { printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret); goto unreg_regions; } ret = misc_register(&wdt_miscdev); if (ret != 0) { printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); goto unreg_reboot; } printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", timeout, nowayout); out: return ret; unreg_reboot: unregister_reboot_notifier(&wdt_notifier); unreg_regions: release_region(wdt_io, 2); goto out; } static void __exit wdt_exit(void) { misc_deregister(&wdt_miscdev); unregister_reboot_notifier(&wdt_notifier); release_region(wdt_io, 2); }
static void w83697hf_select_wdt(void) { w83697hf_unlock(); w83697hf_set_reg(0x07, 0x08); }