static int qpnp_tm_probe()

in qcom/qcom-spmi-temp-alarm.c [370:469]

• 75 lines of code
• 18 McCabe index (conditional complexity)

static int qpnp_tm_probe(struct platform_device *pdev)
{
	struct qpnp_tm_chip *chip;
	struct device_node *node;
	u8 type, subtype, dig_major;
	u32 res;
	int ret, irq;

	node = pdev->dev.of_node;

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

	dev_set_drvdata(&pdev->dev, chip);
	chip->dev = &pdev->dev;

	mutex_init(&chip->lock);

	chip->map = dev_get_regmap(pdev->dev.parent, NULL);
	if (!chip->map)
		return -ENXIO;

	ret = of_property_read_u32(node, "reg", &res);
	if (ret < 0)
		return ret;

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

	/* ADC based measurements are optional */
	chip->adc = devm_iio_channel_get(&pdev->dev, "thermal");
	if (IS_ERR(chip->adc)) {
		ret = PTR_ERR(chip->adc);
		chip->adc = NULL;
		if (ret == -EPROBE_DEFER)
			return ret;
	}

	chip->base = res;

	ret = qpnp_tm_read(chip, QPNP_TM_REG_TYPE, &type);
	if (ret < 0) {
		dev_err(&pdev->dev, "could not read type\n");
		return ret;
	}

	ret = qpnp_tm_read(chip, QPNP_TM_REG_SUBTYPE, &subtype);
	if (ret < 0) {
		dev_err(&pdev->dev, "could not read subtype\n");
		return ret;
	}

	ret = qpnp_tm_read(chip, QPNP_TM_REG_DIG_MAJOR, &dig_major);
	if (ret < 0) {
		dev_err(&pdev->dev, "could not read dig_major\n");
		return ret;
	}

	if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1
				     && subtype != QPNP_TM_SUBTYPE_GEN2)) {
		dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
			type, subtype);
		return -ENODEV;
	}

	chip->subtype = subtype;
	if (subtype == QPNP_TM_SUBTYPE_GEN2 && dig_major >= 1)
		chip->temp_map = &temp_map_gen2_v1;
	else
		chip->temp_map = &temp_map_gen1;

	/*
	 * Register the sensor before initializing the hardware to be able to
	 * read the trip points. get_temp() returns the default temperature
	 * before the hardware initialization is completed.
	 */
	chip->tz_dev = devm_thermal_zone_of_sensor_register(
		&pdev->dev, 0, chip, &qpnp_tm_sensor_ops);
	if (IS_ERR(chip->tz_dev)) {
		dev_err(&pdev->dev, "failed to register sensor\n");
		return PTR_ERR(chip->tz_dev);
	}

	ret = qpnp_tm_init(chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "init failed\n");
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, qpnp_tm_isr,
					IRQF_ONESHOT, node->name, chip);
	if (ret < 0)
		return ret;

	thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);

	return 0;
}