static int pwm_sifive_probe()

in pwm-sifive.c [230:287]

• 46 lines of code
• 7 McCabe index (conditional complexity)

static int pwm_sifive_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct pwm_sifive_ddata *ddata;
	struct pwm_chip *chip;
	int ret;

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

	mutex_init(&ddata->lock);
	chip = &ddata->chip;
	chip->dev = dev;
	chip->ops = &pwm_sifive_ops;
	chip->npwm = 4;

	ddata->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(ddata->regs))
		return PTR_ERR(ddata->regs);

	ddata->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(ddata->clk))
		return dev_err_probe(dev, PTR_ERR(ddata->clk),
				     "Unable to find controller clock\n");

	ret = clk_prepare_enable(ddata->clk);
	if (ret) {
		dev_err(dev, "failed to enable clock for pwm: %d\n", ret);
		return ret;
	}

	/* Watch for changes to underlying clock frequency */
	ddata->notifier.notifier_call = pwm_sifive_clock_notifier;
	ret = clk_notifier_register(ddata->clk, &ddata->notifier);
	if (ret) {
		dev_err(dev, "failed to register clock notifier: %d\n", ret);
		goto disable_clk;
	}

	ret = pwmchip_add(chip);
	if (ret < 0) {
		dev_err(dev, "cannot register PWM: %d\n", ret);
		goto unregister_clk;
	}

	platform_set_drvdata(pdev, ddata);
	dev_dbg(dev, "SiFive PWM chip registered %d PWMs\n", chip->npwm);

	return 0;

unregister_clk:
	clk_notifier_unregister(ddata->clk, &ddata->notifier);
disable_clk:
	clk_disable_unprepare(ddata->clk);

	return ret;
}