drivers/thermal/qcom/tsens.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/err.h>
   7 #include <linux/module.h>
   8 #include <linux/of.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/pm.h>
  11 #include <linux/slab.h>
  12 #include <linux/thermal.h>
  13 #include "tsens.h"
  14
  15 static int tsens_get_temp(void *data, int *temp)
  16 {
  17         const struct tsens_sensor *s = data;
  18         struct tsens_priv *priv = s->priv;
  19
  20         return priv->ops->get_temp(priv, s->id, temp);
  21 }
  22
  23 static int tsens_get_trend(void *data, int trip, enum thermal_trend *trend)
  24 {
  25         const struct tsens_sensor *s = data;
  26         struct tsens_priv *priv = s->priv;
  27
  28         if (priv->ops->get_trend)
  29                 return priv->ops->get_trend(priv, s->id, trend);
  30
  31         return -ENOTSUPP;
  32 }
  33
  34 static int  __maybe_unused tsens_suspend(struct device *dev)
  35 {
  36         struct tsens_priv *priv = dev_get_drvdata(dev);
  37
  38         if (priv->ops && priv->ops->suspend)
  39                 return priv->ops->suspend(priv);
  40
  41         return 0;
  42 }
  43
  44 static int __maybe_unused tsens_resume(struct device *dev)
  45 {
  46         struct tsens_priv *priv = dev_get_drvdata(dev);
  47
  48         if (priv->ops && priv->ops->resume)
  49                 return priv->ops->resume(priv);
  50
  51         return 0;
  52 }
  53
  54 static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume);
  55
  56 static const struct of_device_id tsens_table[] = {
  57         {
  58                 .compatible = "qcom,msm8916-tsens",
  59                 .data = &data_8916,
  60         }, {
  61                 .compatible = "qcom,msm8974-tsens",
  62                 .data = &data_8974,
  63         }, {
  64                 .compatible = "qcom,msm8996-tsens",
  65                 .data = &data_8996,
  66         }, {
  67                 .compatible = "qcom,tsens-v1",
  68                 .data = &data_tsens_v1,
  69         }, {
  70                 .compatible = "qcom,tsens-v2",
  71                 .data = &data_tsens_v2,
  72         },
  73         {}
  74 };
  75 MODULE_DEVICE_TABLE(of, tsens_table);
  76
  77 static const struct thermal_zone_of_device_ops tsens_of_ops = {
  78         .get_temp = tsens_get_temp,
  79         .get_trend = tsens_get_trend,
  80 };
  81
  82 static int tsens_register(struct tsens_priv *priv)
  83 {
  84         int i;
  85         struct thermal_zone_device *tzd;
  86
  87         for (i = 0;  i < priv->num_sensors; i++) {
  88                 if (!is_sensor_enabled(priv, priv->sensor[i].hw_id)) {
  89                         dev_err(priv->dev, "sensor %d: disabled\n",
  90                                 priv->sensor[i].hw_id);
  91                         continue;
  92                 }
  93                 priv->sensor[i].priv = priv;
  94                 priv->sensor[i].id = i;
  95                 tzd = devm_thermal_zone_of_sensor_register(priv->dev, i,
  96                                                            &priv->sensor[i],
  97                                                            &tsens_of_ops);
  98                 if (IS_ERR(tzd))
  99                         continue;
 100                 priv->sensor[i].tzd = tzd;
 101                 if (priv->ops->enable)
 102                         priv->ops->enable(priv, i);
 103         }
 104         return 0;
 105 }
 106
 107 static int tsens_probe(struct platform_device *pdev)
 108 {
 109         int ret, i;
 110         struct device *dev;
 111         struct device_node *np;
 112         struct tsens_priv *priv;
 113         const struct tsens_plat_data *data;
 114         const struct of_device_id *id;
 115         u32 num_sensors;
 116
 117         if (pdev->dev.of_node)
 118                 dev = &pdev->dev;
 119         else
 120                 dev = pdev->dev.parent;
 121
 122         np = dev->of_node;
 123
 124         id = of_match_node(tsens_table, np);
 125         if (id)
 126                 data = id->data;
 127         else
 128                 data = &data_8960;
 129
 130         num_sensors = data->num_sensors;
 131
 132         if (np)
 133                 of_property_read_u32(np, "#qcom,sensors", &num_sensors);
 134
 135         if (num_sensors <= 0) {
 136                 dev_err(dev, "invalid number of sensors\n");
 137                 return -EINVAL;
 138         }
 139
 140         priv = devm_kzalloc(dev,
 141                              struct_size(priv, sensor, num_sensors),
 142                              GFP_KERNEL);
 143         if (!priv)
 144                 return -ENOMEM;
 145
 146         priv->dev = dev;
 147         priv->num_sensors = num_sensors;
 148         priv->ops = data->ops;
 149         for (i = 0;  i < priv->num_sensors; i++) {
 150                 if (data->hw_ids)
 151                         priv->sensor[i].hw_id = data->hw_ids[i];
 152                 else
 153                         priv->sensor[i].hw_id = i;
 154         }
 155         priv->feat = data->feat;
 156         priv->fields = data->fields;
 157
 158         if (!priv->ops || !priv->ops->init || !priv->ops->get_temp)
 159                 return -EINVAL;
 160
 161         ret = priv->ops->init(priv);
 162         if (ret < 0) {
 163                 dev_err(dev, "tsens init failed\n");
 164                 return ret;
 165         }
 166
 167         if (priv->ops->calibrate) {
 168                 ret = priv->ops->calibrate(priv);
 169                 if (ret < 0) {
 170                         if (ret != -EPROBE_DEFER)
 171                                 dev_err(dev, "tsens calibration failed\n");
 172                         return ret;
 173                 }
 174         }
 175
 176         ret = tsens_register(priv);
 177
 178         platform_set_drvdata(pdev, priv);
 179
 180         return ret;
 181 }
 182
 183 static int tsens_remove(struct platform_device *pdev)
 184 {
 185         struct tsens_priv *priv = platform_get_drvdata(pdev);
 186
 187         if (priv->ops->disable)
 188                 priv->ops->disable(priv);
 189
 190         return 0;
 191 }
 192
 193 static struct platform_driver tsens_driver = {
 194         .probe = tsens_probe,
 195         .remove = tsens_remove,
 196         .driver = {
 197                 .name = "qcom-tsens",
 198                 .pm     = &tsens_pm_ops,
 199                 .of_match_table = tsens_table,
 200         },
 201 };
 202 module_platform_driver(tsens_driver);
 203
 204 MODULE_LICENSE("GPL v2");
 205 MODULE_DESCRIPTION("QCOM Temperature Sensor driver");
 206 MODULE_ALIAS("platform:qcom-tsens");