static SIMPLE_DEV_PM_OPS()

in misc/pm8941-pwrkey.c [166:304]

• 112 lines of code
• 21 McCabe index (conditional complexity)

static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
			 pm8941_pwrkey_suspend, pm8941_pwrkey_resume);

static int pm8941_pwrkey_probe(struct platform_device *pdev)
{
	struct pm8941_pwrkey *pwrkey;
	bool pull_up;
	struct device *parent;
	u32 req_delay;
	int error;

	if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay))
		req_delay = 15625;

	if (req_delay > 2000000 || req_delay == 0) {
		dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay);
		return -EINVAL;
	}

	pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up");

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

	pwrkey->dev = &pdev->dev;
	pwrkey->data = of_device_get_match_data(&pdev->dev);

	parent = pdev->dev.parent;
	pwrkey->regmap = dev_get_regmap(parent, NULL);
	if (!pwrkey->regmap) {
		/*
		 * We failed to get regmap for parent. Let's see if we are
		 * a child of pon node and read regmap and reg from its
		 * parent.
		 */
		pwrkey->regmap = dev_get_regmap(parent->parent, NULL);
		if (!pwrkey->regmap) {
			dev_err(&pdev->dev, "failed to locate regmap\n");
			return -ENODEV;
		}

		error = of_property_read_u32(parent->of_node,
					     "reg", &pwrkey->baseaddr);
	} else {
		error = of_property_read_u32(pdev->dev.of_node, "reg",
					     &pwrkey->baseaddr);
	}
	if (error)
		return error;

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

	error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2,
			    &pwrkey->revision);
	if (error) {
		dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
		return error;
	}

	error = of_property_read_u32(pdev->dev.of_node, "linux,code",
				     &pwrkey->code);
	if (error) {
		dev_dbg(&pdev->dev,
			"no linux,code assuming power (%d)\n", error);
		pwrkey->code = KEY_POWER;
	}

	pwrkey->input = devm_input_allocate_device(&pdev->dev);
	if (!pwrkey->input) {
		dev_dbg(&pdev->dev, "unable to allocate input device\n");
		return -ENOMEM;
	}

	input_set_capability(pwrkey->input, EV_KEY, pwrkey->code);

	pwrkey->input->name = pwrkey->data->name;
	pwrkey->input->phys = pwrkey->data->phys;

	if (pwrkey->data->supports_debounce_config) {
		req_delay = (req_delay << 6) / USEC_PER_SEC;
		req_delay = ilog2(req_delay);

		error = regmap_update_bits(pwrkey->regmap,
					   pwrkey->baseaddr + PON_DBC_CTL,
					   PON_DBC_DELAY_MASK,
					   req_delay);
		if (error) {
			dev_err(&pdev->dev, "failed to set debounce: %d\n",
				error);
			return error;
		}
	}

	if (pwrkey->data->pull_up_bit) {
		error = regmap_update_bits(pwrkey->regmap,
					   pwrkey->baseaddr + PON_PULL_CTL,
					   pwrkey->data->pull_up_bit,
					   pull_up ? pwrkey->data->pull_up_bit :
						     0);
		if (error) {
			dev_err(&pdev->dev, "failed to set pull: %d\n", error);
			return error;
		}
	}

	error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq,
					  NULL, pm8941_pwrkey_irq,
					  IRQF_ONESHOT,
					  pwrkey->data->name, pwrkey);
	if (error) {
		dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error);
		return error;
	}

	error = input_register_device(pwrkey->input);
	if (error) {
		dev_err(&pdev->dev, "failed to register input device: %d\n",
			error);
		return error;
	}

	if (pwrkey->data->supports_ps_hold_poff_config) {
		pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify;
		error = register_reboot_notifier(&pwrkey->reboot_notifier);
		if (error) {
			dev_err(&pdev->dev, "failed to register reboot notifier: %d\n",
				error);
			return error;
		}
	}

	platform_set_drvdata(pdev, pwrkey);
	device_init_wakeup(&pdev->dev, 1);

	return 0;
}