static long ar7_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { static const struct watchdog_info ident = { .identity = LONGNAME, .firmware_version = 1, .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE), }; int new_margin; switch (cmd) { case WDIOC_GETSUPPORT: if (copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))) return -EFAULT; return 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: if (put_user(0, (int *)arg)) return -EFAULT; return 0; case WDIOC_KEEPALIVE: ar7_wdt_kick(1); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_margin, (int *)arg)) return -EFAULT; if (new_margin < 1) return -EINVAL; spin_lock(&wdt_lock); ar7_wdt_update_margin(new_margin); ar7_wdt_kick(1); spin_unlock(&wdt_lock); case WDIOC_GETTIMEOUT: if (put_user(margin, (int *)arg)) return -EFAULT; return 0; default: return -ENOTTY; } } static const struct file_operations ar7_wdt_fops = { .owner = THIS_MODULE, .write = ar7_wdt_write, .unlocked_ioctl = ar7_wdt_ioctl, .open = ar7_wdt_open, .release = ar7_wdt_release, .llseek = no_llseek, }; static struct miscdevice ar7_wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &ar7_wdt_fops, }; static int __devinit ar7_wdt_probe(struct platform_device *pdev) { int rc; ar7_regs_wdt = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"); if (!ar7_regs_wdt) { pr_err("could not get registers resource\n"); return -ENODEV; } ar7_wdt = devm_request_and_ioremap(&pdev->dev, ar7_regs_wdt); if (!ar7_wdt) { pr_err("could not ioremap registers\n"); return -ENXIO; } vbus_clk = clk_get(NULL, "vbus"); if (IS_ERR(vbus_clk)) { pr_err("could not get vbus clock\n"); return PTR_ERR(vbus_clk); } ar7_wdt_disable_wdt(); ar7_wdt_prescale(prescale_value); ar7_wdt_update_margin(margin); rc = misc_register(&ar7_wdt_miscdev); if (rc) { pr_err("unable to register misc device\n"); goto out; } return 0; out: clk_put(vbus_clk); vbus_clk = NULL; return rc; } static int __devexit ar7_wdt_remove(struct platform_device *pdev) { misc_deregister(&ar7_wdt_miscdev); clk_put(vbus_clk); vbus_clk = NULL; return 0; }
static void ar7_wdt_enable_wdt(void) { pr_debug("enabling watchdog timer\n"); ar7_wdt_disable(1); ar7_wdt_kick(1); }
static void ar7_wdt_enable_wdt(void) { printk(KERN_DEBUG DRVNAME ": enabling watchdog timer\n"); ar7_wdt_disable(1); ar7_wdt_kick(1); }