drivers/thermal/qcom/tsens.c

   1 /*
   2  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm.h>
  20 #include <linux/slab.h>
  21 #include <linux/thermal.h>
  22 #include "tsens.h"
  23
  24 static int tsens_get_temp(void *data, int *temp)
  25 {
  26         const struct tsens_sensor *s = data;
  27         struct tsens_device *tmdev = s->tmdev;
  28
  29         return tmdev->ops->get_temp(tmdev, s->id, temp);
  30 }
  31
  32 static int tsens_get_trend(void *p, int trip, enum thermal_trend *trend)
  33 {
  34         const struct tsens_sensor *s = p;
  35         struct tsens_device *tmdev = s->tmdev;
  36
  37         if (tmdev->ops->get_trend)
  38                 return  tmdev->ops->get_trend(tmdev, s->id, trend);
  39
  40         return -ENOTSUPP;
  41 }
  42
  43 static int  __maybe_unused tsens_suspend(struct device *dev)
  44 {
  45         struct tsens_device *tmdev = dev_get_drvdata(dev);
  46
  47         if (tmdev->ops && tmdev->ops->suspend)
  48                 return tmdev->ops->suspend(tmdev);
  49
  50         return 0;
  51 }
  52
  53 static int __maybe_unused tsens_resume(struct device *dev)
  54 {
  55         struct tsens_device *tmdev = dev_get_drvdata(dev);
  56
  57         if (tmdev->ops && tmdev->ops->resume)
  58                 return tmdev->ops->resume(tmdev);
  59
  60         return 0;
  61 }
  62
  63 static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume);
  64
  65 static const struct of_device_id tsens_table[] = {
  66         {
  67                 .compatible = "qcom,msm8916-tsens",
  68                 .data = &data_8916,
  69         }, {
  70                 .compatible = "qcom,msm8974-tsens",
  71                 .data = &data_8974,
  72         }, {
  73                 .compatible = "qcom,msm8996-tsens",
  74                 .data = &data_8996,
  75         }, {
  76                 .compatible = "qcom,tsens-v2",
  77                 .data = &data_tsens_v2,
  78         },
  79         {}
  80 };
  81 MODULE_DEVICE_TABLE(of, tsens_table);
  82
  83 static const struct thermal_zone_of_device_ops tsens_of_ops = {
  84         .get_temp = tsens_get_temp,
  85         .get_trend = tsens_get_trend,
  86 };
  87
  88 static int tsens_register(struct tsens_device *tmdev)
  89 {
  90         int i;
  91         struct thermal_zone_device *tzd;
  92         u32 *hw_id, n = tmdev->num_sensors;
  93
  94         hw_id = devm_kcalloc(tmdev->dev, n, sizeof(u32), GFP_KERNEL);
  95         if (!hw_id)
  96                 return -ENOMEM;
  97
  98         for (i = 0;  i < tmdev->num_sensors; i++) {
  99                 tmdev->sensor[i].tmdev = tmdev;
 100                 tmdev->sensor[i].id = i;
 101                 tzd = devm_thermal_zone_of_sensor_register(tmdev->dev, i,
 102                                                            &tmdev->sensor[i],
 103                                                            &tsens_of_ops);
 104                 if (IS_ERR(tzd))
 105                         continue;
 106                 tmdev->sensor[i].tzd = tzd;
 107                 if (tmdev->ops->enable)
 108                         tmdev->ops->enable(tmdev, i);
 109         }
 110         return 0;
 111 }
 112
 113 static int tsens_probe(struct platform_device *pdev)
 114 {
 115         int ret, i;
 116         struct device *dev;
 117         struct device_node *np;
 118         struct tsens_device *tmdev;
 119         const struct tsens_data *data;
 120         const struct of_device_id *id;
 121         u32 num_sensors;
 122
 123         if (pdev->dev.of_node)
 124                 dev = &pdev->dev;
 125         else
 126                 dev = pdev->dev.parent;
 127
 128         np = dev->of_node;
 129
 130         id = of_match_node(tsens_table, np);
 131         if (id)
 132                 data = id->data;
 133         else
 134                 data = &data_8960;
 135
 136         num_sensors = data->num_sensors;
 137
 138         if (np)
 139                 of_property_read_u32(np, "#qcom,sensors", &num_sensors);
 140
 141         if (num_sensors <= 0) {
 142                 dev_err(dev, "invalid number of sensors\n");
 143                 return -EINVAL;
 144         }
 145
 146         tmdev = devm_kzalloc(dev,
 147                              struct_size(tmdev, sensor, num_sensors),
 148                              GFP_KERNEL);
 149         if (!tmdev)
 150                 return -ENOMEM;
 151
 152         tmdev->dev = dev;
 153         tmdev->num_sensors = num_sensors;
 154         tmdev->ops = data->ops;
 155         for (i = 0;  i < tmdev->num_sensors; i++) {
 156                 if (data->hw_ids)
 157                         tmdev->sensor[i].hw_id = data->hw_ids[i];
 158                 else
 159                         tmdev->sensor[i].hw_id = i;
 160         }
 161
 162         if (!tmdev->ops || !tmdev->ops->init || !tmdev->ops->get_temp)
 163                 return -EINVAL;
 164
 165         ret = tmdev->ops->init(tmdev);
 166         if (ret < 0) {
 167                 dev_err(dev, "tsens init failed\n");
 168                 return ret;
 169         }
 170
 171         if (tmdev->ops->calibrate) {
 172                 ret = tmdev->ops->calibrate(tmdev);
 173                 if (ret < 0) {
 174                         if (ret != -EPROBE_DEFER)
 175                                 dev_err(dev, "tsens calibration failed\n");
 176                         return ret;
 177                 }
 178         }
 179
 180         ret = tsens_register(tmdev);
 181
 182         platform_set_drvdata(pdev, tmdev);
 183
 184         return ret;
 185 }
 186
 187 static int tsens_remove(struct platform_device *pdev)
 188 {
 189         struct tsens_device *tmdev = platform_get_drvdata(pdev);
 190
 191         if (tmdev->ops->disable)
 192                 tmdev->ops->disable(tmdev);
 193
 194         return 0;
 195 }
 196
 197 static struct platform_driver tsens_driver = {
 198         .probe = tsens_probe,
 199         .remove = tsens_remove,
 200         .driver = {
 201                 .name = "qcom-tsens",
 202                 .pm     = &tsens_pm_ops,
 203                 .of_match_table = tsens_table,
 204         },
 205 };
 206 module_platform_driver(tsens_driver);
 207
 208 MODULE_LICENSE("GPL v2");
 209 MODULE_DESCRIPTION("QCOM Temperature Sensor driver");
 210 MODULE_ALIAS("platform:qcom-tsens");