static int pwm_samsung_probe()

in pwm-samsung.c [523:592]

• 56 lines of code
• 14 McCabe index (conditional complexity)

static int pwm_samsung_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct samsung_pwm_chip *chip;
	unsigned int chan;
	int ret;

	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	chip->chip.dev = &pdev->dev;
	chip->chip.ops = &pwm_samsung_ops;
	chip->chip.npwm = SAMSUNG_PWM_NUM;
	chip->inverter_mask = BIT(SAMSUNG_PWM_NUM) - 1;

	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
		ret = pwm_samsung_parse_dt(chip);
		if (ret)
			return ret;
	} else {
		if (!pdev->dev.platform_data) {
			dev_err(&pdev->dev, "no platform data specified\n");
			return -EINVAL;
		}

		memcpy(&chip->variant, pdev->dev.platform_data,
							sizeof(chip->variant));
	}

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

	chip->base_clk = devm_clk_get(&pdev->dev, "timers");
	if (IS_ERR(chip->base_clk)) {
		dev_err(dev, "failed to get timer base clk\n");
		return PTR_ERR(chip->base_clk);
	}

	ret = clk_prepare_enable(chip->base_clk);
	if (ret < 0) {
		dev_err(dev, "failed to enable base clock\n");
		return ret;
	}

	for (chan = 0; chan < SAMSUNG_PWM_NUM; ++chan)
		if (chip->variant.output_mask & BIT(chan))
			pwm_samsung_set_invert(chip, chan, true);

	/* Following clocks are optional. */
	chip->tclk0 = devm_clk_get(&pdev->dev, "pwm-tclk0");
	chip->tclk1 = devm_clk_get(&pdev->dev, "pwm-tclk1");

	platform_set_drvdata(pdev, chip);

	ret = pwmchip_add(&chip->chip);
	if (ret < 0) {
		dev_err(dev, "failed to register PWM chip\n");
		clk_disable_unprepare(chip->base_clk);
		return ret;
	}

	dev_dbg(dev, "base_clk at %lu, tclk0 at %lu, tclk1 at %lu\n",
		clk_get_rate(chip->base_clk),
		!IS_ERR(chip->tclk0) ? clk_get_rate(chip->tclk0) : 0,
		!IS_ERR(chip->tclk1) ? clk_get_rate(chip->tclk1) : 0);

	return 0;
}