static int abb5zes3_probe()

in rtc-ab-b5ze-s3.c [820:901]

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

static int abb5zes3_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct abb5zes3_rtc_data *data = NULL;
	struct device *dev = &client->dev;
	struct regmap *regmap;
	int ret;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_I2C_BLOCK))
		return -ENODEV;

	regmap = devm_regmap_init_i2c(client, &abb5zes3_rtc_regmap_config);
	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(dev, "%s: regmap allocation failed: %d\n",
			__func__, ret);
		return ret;
	}

	ret = abb5zes3_i2c_validate_chip(regmap);
	if (ret)
		return ret;

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

	data->regmap = regmap;
	dev_set_drvdata(dev, data);

	ret = abb5zes3_rtc_check_setup(dev);
	if (ret)
		return ret;

	data->rtc = devm_rtc_allocate_device(dev);
	ret = PTR_ERR_OR_ZERO(data->rtc);
	if (ret) {
		dev_err(dev, "%s: unable to allocate RTC device (%d)\n",
			__func__, ret);
		return ret;
	}

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(dev, client->irq, NULL,
						_abb5zes3_rtc_interrupt,
						IRQF_SHARED | IRQF_ONESHOT,
						DRV_NAME, client);
		if (!ret) {
			device_init_wakeup(dev, true);
			data->irq = client->irq;
			dev_dbg(dev, "%s: irq %d used by RTC\n", __func__,
				client->irq);
		} else {
			dev_err(dev, "%s: irq %d unavailable (%d)\n",
				__func__, client->irq, ret);
			goto err;
		}
	}

	data->rtc->ops = &rtc_ops;
	data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	data->rtc->range_max = RTC_TIMESTAMP_END_2099;

	/* Enable battery low detection interrupt if battery not already low */
	if (!data->battery_low && data->irq) {
		ret = _abb5zes3_rtc_battery_low_irq_enable(regmap, true);
		if (ret) {
			dev_err(dev, "%s: enabling battery low interrupt generation failed (%d)\n",
				__func__, ret);
			goto err;
		}
	}

	ret = devm_rtc_register_device(data->rtc);

err:
	if (ret && data->irq)
		device_init_wakeup(dev, false);
	return ret;
}