static int lpc18xx_wdt_probe()

in lpc18xx_wdt.c [205:288]

• 64 lines of code
• 10 McCabe index (conditional complexity)

static int lpc18xx_wdt_probe(struct platform_device *pdev)
{
	struct lpc18xx_wdt_dev *lpc18xx_wdt;
	struct device *dev = &pdev->dev;
	int ret;

	lpc18xx_wdt = devm_kzalloc(dev, sizeof(*lpc18xx_wdt), GFP_KERNEL);
	if (!lpc18xx_wdt)
		return -ENOMEM;

	lpc18xx_wdt->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(lpc18xx_wdt->base))
		return PTR_ERR(lpc18xx_wdt->base);

	lpc18xx_wdt->reg_clk = devm_clk_get(dev, "reg");
	if (IS_ERR(lpc18xx_wdt->reg_clk)) {
		dev_err(dev, "failed to get the reg clock\n");
		return PTR_ERR(lpc18xx_wdt->reg_clk);
	}

	lpc18xx_wdt->wdt_clk = devm_clk_get(dev, "wdtclk");
	if (IS_ERR(lpc18xx_wdt->wdt_clk)) {
		dev_err(dev, "failed to get the wdt clock\n");
		return PTR_ERR(lpc18xx_wdt->wdt_clk);
	}

	ret = clk_prepare_enable(lpc18xx_wdt->reg_clk);
	if (ret) {
		dev_err(dev, "could not prepare or enable sys clock\n");
		return ret;
	}
	ret = devm_add_action_or_reset(dev, lpc18xx_clk_disable_unprepare,
				       lpc18xx_wdt->reg_clk);
	if (ret)
		return ret;

	ret = clk_prepare_enable(lpc18xx_wdt->wdt_clk);
	if (ret) {
		dev_err(dev, "could not prepare or enable wdt clock\n");
		return ret;
	}
	ret = devm_add_action_or_reset(dev, lpc18xx_clk_disable_unprepare,
				       lpc18xx_wdt->wdt_clk);
	if (ret)
		return ret;

	/* We use the clock rate to calculate timeouts */
	lpc18xx_wdt->clk_rate = clk_get_rate(lpc18xx_wdt->wdt_clk);
	if (lpc18xx_wdt->clk_rate == 0) {
		dev_err(dev, "failed to get clock rate\n");
		return -EINVAL;
	}

	lpc18xx_wdt->wdt_dev.info = &lpc18xx_wdt_info;
	lpc18xx_wdt->wdt_dev.ops = &lpc18xx_wdt_ops;

	lpc18xx_wdt->wdt_dev.min_timeout = DIV_ROUND_UP(LPC18XX_WDT_TC_MIN *
				LPC18XX_WDT_CLK_DIV, lpc18xx_wdt->clk_rate);

	lpc18xx_wdt->wdt_dev.max_timeout = (LPC18XX_WDT_TC_MAX *
				LPC18XX_WDT_CLK_DIV) / lpc18xx_wdt->clk_rate;

	lpc18xx_wdt->wdt_dev.timeout = min(lpc18xx_wdt->wdt_dev.max_timeout,
					   LPC18XX_WDT_DEF_TIMEOUT);

	spin_lock_init(&lpc18xx_wdt->lock);

	lpc18xx_wdt->wdt_dev.parent = dev;
	watchdog_set_drvdata(&lpc18xx_wdt->wdt_dev, lpc18xx_wdt);

	watchdog_init_timeout(&lpc18xx_wdt->wdt_dev, heartbeat, dev);

	__lpc18xx_wdt_set_timeout(lpc18xx_wdt);

	timer_setup(&lpc18xx_wdt->timer, lpc18xx_wdt_timer_feed, 0);

	watchdog_set_nowayout(&lpc18xx_wdt->wdt_dev, nowayout);
	watchdog_set_restart_priority(&lpc18xx_wdt->wdt_dev, 128);

	platform_set_drvdata(pdev, lpc18xx_wdt);

	watchdog_stop_on_reboot(&lpc18xx_wdt->wdt_dev);
	return devm_watchdog_register_device(dev, &lpc18xx_wdt->wdt_dev);
}