static int exynos_adc_probe()

in adc/exynos_adc.c [790:947]

• 128 lines of code
• 26 McCabe index (conditional complexity)

static int exynos_adc_probe(struct platform_device *pdev)
{
	struct exynos_adc *info = NULL;
	struct device_node *np = pdev->dev.of_node;
	struct s3c2410_ts_mach_info *pdata = dev_get_platdata(&pdev->dev);
	struct iio_dev *indio_dev = NULL;
	bool has_ts = false;
	int ret;
	int irq;

	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct exynos_adc));
	if (!indio_dev) {
		dev_err(&pdev->dev, "failed allocating iio device\n");
		return -ENOMEM;
	}

	info = iio_priv(indio_dev);

	info->data = exynos_adc_get_data(pdev);
	if (!info->data) {
		dev_err(&pdev->dev, "failed getting exynos_adc_data\n");
		return -EINVAL;
	}

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


	if (info->data->needs_adc_phy) {
		info->pmu_map = syscon_regmap_lookup_by_phandle(
					pdev->dev.of_node,
					"samsung,syscon-phandle");
		if (IS_ERR(info->pmu_map)) {
			dev_err(&pdev->dev, "syscon regmap lookup failed.\n");
			return PTR_ERR(info->pmu_map);
		}
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;
	info->irq = irq;

	irq = platform_get_irq(pdev, 1);
	if (irq == -EPROBE_DEFER)
		return irq;

	info->tsirq = irq;

	info->dev = &pdev->dev;

	init_completion(&info->completion);

	info->clk = devm_clk_get(&pdev->dev, "adc");
	if (IS_ERR(info->clk)) {
		dev_err(&pdev->dev, "failed getting clock, err = %ld\n",
							PTR_ERR(info->clk));
		return PTR_ERR(info->clk);
	}

	if (info->data->needs_sclk) {
		info->sclk = devm_clk_get(&pdev->dev, "sclk");
		if (IS_ERR(info->sclk)) {
			dev_err(&pdev->dev,
				"failed getting sclk clock, err = %ld\n",
				PTR_ERR(info->sclk));
			return PTR_ERR(info->sclk);
		}
	}

	info->vdd = devm_regulator_get(&pdev->dev, "vdd");
	if (IS_ERR(info->vdd))
		return dev_err_probe(&pdev->dev, PTR_ERR(info->vdd),
				     "failed getting regulator");

	ret = regulator_enable(info->vdd);
	if (ret)
		return ret;

	ret = exynos_adc_prepare_clk(info);
	if (ret)
		goto err_disable_reg;

	ret = exynos_adc_enable_clk(info);
	if (ret)
		goto err_unprepare_clk;

	platform_set_drvdata(pdev, indio_dev);

	indio_dev->name = dev_name(&pdev->dev);
	indio_dev->info = &exynos_adc_iio_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = exynos_adc_iio_channels;
	indio_dev->num_channels = info->data->num_channels;

	mutex_init(&info->lock);

	ret = request_irq(info->irq, exynos_adc_isr,
					0, dev_name(&pdev->dev), info);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
							info->irq);
		goto err_disable_clk;
	}

	ret = iio_device_register(indio_dev);
	if (ret)
		goto err_irq;

	if (info->data->init_hw)
		info->data->init_hw(info);

	/* leave out any TS related code if unreachable */
	if (IS_REACHABLE(CONFIG_INPUT)) {
		has_ts = of_property_read_bool(pdev->dev.of_node,
					       "has-touchscreen") || pdata;
	}

	if (pdata)
		info->delay = pdata->delay;
	else
		info->delay = 10000;

	if (has_ts)
		ret = exynos_adc_ts_init(info);
	if (ret)
		goto err_iio;

	ret = of_platform_populate(np, exynos_adc_match, NULL, &indio_dev->dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed adding child nodes\n");
		goto err_of_populate;
	}

	return 0;

err_of_populate:
	device_for_each_child(&indio_dev->dev, NULL,
				exynos_adc_remove_devices);
	if (has_ts) {
		input_unregister_device(info->input);
		free_irq(info->tsirq, info);
	}
err_iio:
	iio_device_unregister(indio_dev);
err_irq:
	free_irq(info->irq, info);
err_disable_clk:
	if (info->data->exit_hw)
		info->data->exit_hw(info);
	exynos_adc_disable_clk(info);
err_unprepare_clk:
	exynos_adc_unprepare_clk(info);
err_disable_reg:
	regulator_disable(info->vdd);
	return ret;
}