text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   */
  
  #include <linux/err.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/pm.h>
  #include <linux/slab.h>
  #include <linux/thermal.h>
  #include "tsens.h"
  
  static int tsens_get_temp(void *data, int *temp)
  {
  	const struct tsens_sensor *s = data;
  	struct tsens_priv *priv = s->priv;
  
  	return priv->ops->get_temp(priv, s->id, temp);
  }
  
  static int tsens_get_trend(void *data, int trip, enum thermal_trend *trend)
  {
  	const struct tsens_sensor *s = data;
  	struct tsens_priv *priv = s->priv;
  
  	if (priv->ops->get_trend)
  		return priv->ops->get_trend(priv, s->id, trend);
  
  	return -ENOTSUPP;
  }
  
  static int  __maybe_unused tsens_suspend(struct device *dev)
  {
  	struct tsens_priv *priv = dev_get_drvdata(dev);
  
  	if (priv->ops && priv->ops->suspend)
  		return priv->ops->suspend(priv);
  
  	return 0;
  }
  
  static int __maybe_unused tsens_resume(struct device *dev)
  {
  	struct tsens_priv *priv = dev_get_drvdata(dev);
  
  	if (priv->ops && priv->ops->resume)
  		return priv->ops->resume(priv);
  
  	return 0;
  }
  
  static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume);
  
  static const struct of_device_id tsens_table[] = {
  	{
  		.compatible = "qcom,msm8916-tsens",
  		.data = &data_8916,
  	}, {
  		.compatible = "qcom,msm8974-tsens",
  		.data = &data_8974,
  	}, {
  		.compatible = "qcom,msm8996-tsens",
  		.data = &data_8996,
  	}, {
  		.compatible = "qcom,tsens-v1",
  		.data = &data_tsens_v1,
  	}, {
  		.compatible = "qcom,tsens-v2",
  		.data = &data_tsens_v2,
  	},
  	{}
  };
  MODULE_DEVICE_TABLE(of, tsens_table);
  
  static const struct thermal_zone_of_device_ops tsens_of_ops = {
  	.get_temp = tsens_get_temp,
  	.get_trend = tsens_get_trend,
  };
  
  static int tsens_register(struct tsens_priv *priv)
  {
  	int i;
  	struct thermal_zone_device *tzd;
  
  	for (i = 0;  i < priv->num_sensors; i++) {
  		priv->sensor[i].priv = priv;
  		priv->sensor[i].id = i;
  		tzd = devm_thermal_zone_of_sensor_register(priv->dev, i,
  							   &priv->sensor[i],
  							   &tsens_of_ops);
  		if (IS_ERR(tzd))
  			continue;
  		priv->sensor[i].tzd = tzd;
  		if (priv->ops->enable)
  			priv->ops->enable(priv, i);
  	}
  	return 0;
  }
  
  static int tsens_probe(struct platform_device *pdev)
  {
  	int ret, i;
  	struct device *dev;
  	struct device_node *np;
  	struct tsens_priv *priv;
  	const struct tsens_plat_data *data;
  	const struct of_device_id *id;
  	u32 num_sensors;
  
  	if (pdev->dev.of_node)
  		dev = &pdev->dev;
  	else
  		dev = pdev->dev.parent;
  
  	np = dev->of_node;
  
  	id = of_match_node(tsens_table, np);
  	if (id)
  		data = id->data;
  	else
  		data = &data_8960;
  
  	num_sensors = data->num_sensors;
  
  	if (np)
  		of_property_read_u32(np, "#qcom,sensors", &num_sensors);
  
  	if (num_sensors <= 0) {
  		dev_err(dev, "invalid number of sensors\n");
  		return -EINVAL;
  	}
  
  	priv = devm_kzalloc(dev,
  			     struct_size(priv, sensor, num_sensors),
  			     GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
  
  	priv->dev = dev;
  	priv->num_sensors = num_sensors;
  	priv->ops = data->ops;
  	for (i = 0;  i < priv->num_sensors; i++) {
  		if (data->hw_ids)
  			priv->sensor[i].hw_id = data->hw_ids[i];
  		else
  			priv->sensor[i].hw_id = i;
  	}
  	priv->feat = data->feat;
  	priv->fields = data->fields;
  
  	if (!priv->ops || !priv->ops->init || !priv->ops->get_temp)
  		return -EINVAL;
  
  	ret = priv->ops->init(priv);
  	if (ret < 0) {
  		dev_err(dev, "tsens init failed\n");
  		return ret;
  	}
  
  	if (priv->ops->calibrate) {
  		ret = priv->ops->calibrate(priv);
  		if (ret < 0) {
  			if (ret != -EPROBE_DEFER)
  				dev_err(dev, "tsens calibration failed\n");
  			return ret;
  		}
  	}
  
  	ret = tsens_register(priv);
  
  	platform_set_drvdata(pdev, priv);
  
  	return ret;
  }
  
  static int tsens_remove(struct platform_device *pdev)
  {
  	struct tsens_priv *priv = platform_get_drvdata(pdev);
  
  	if (priv->ops->disable)
  		priv->ops->disable(priv);
  
  	return 0;
  }
  
  static struct platform_driver tsens_driver = {
  	.probe = tsens_probe,
  	.remove = tsens_remove,
  	.driver = {
  		.name = "qcom-tsens",
  		.pm	= &tsens_pm_ops,
  		.of_match_table = tsens_table,
  	},
  };
  module_platform_driver(tsens_driver);
  
  MODULE_LICENSE("GPL v2");
  MODULE_DESCRIPTION("QCOM Temperature Sensor driver");
  MODULE_ALIAS("platform:qcom-tsens");
  