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 {} 77 }; 78 MODULE_DEVICE_TABLE(of, tsens_table); 79 80 static const struct thermal_zone_of_device_ops tsens_of_ops = { 81 .get_temp = tsens_get_temp, 82 .get_trend = tsens_get_trend, 83 }; 84 85 static int tsens_register(struct tsens_device *tmdev) 86 { 87 int i; 88 struct thermal_zone_device *tzd; 89 u32 *hw_id, n = tmdev->num_sensors; 90 91 hw_id = devm_kcalloc(tmdev->dev, n, sizeof(u32), GFP_KERNEL); 92 if (!hw_id) 93 return -ENOMEM; 94 95 for (i = 0; i < tmdev->num_sensors; i++) { 96 tmdev->sensor[i].tmdev = tmdev; 97 tmdev->sensor[i].id = i; 98 tzd = devm_thermal_zone_of_sensor_register(tmdev->dev, i, 99 &tmdev->sensor[i], 100 &tsens_of_ops); 101 if (IS_ERR(tzd)) 102 continue; 103 tmdev->sensor[i].tzd = tzd; 104 if (tmdev->ops->enable) 105 tmdev->ops->enable(tmdev, i); 106 } 107 return 0; 108 } 109 110 static int tsens_probe(struct platform_device *pdev) 111 { 112 int ret, i; 113 struct device *dev; 114 struct device_node *np; 115 struct tsens_device *tmdev; 116 const struct tsens_data *data; 117 const struct of_device_id *id; 118 u32 num_sensors; 119 120 if (pdev->dev.of_node) 121 dev = &pdev->dev; 122 else 123 dev = pdev->dev.parent; 124 125 np = dev->of_node; 126 127 id = of_match_node(tsens_table, np); 128 if (id) 129 data = id->data; 130 else 131 data = &data_8960; 132 133 num_sensors = data->num_sensors; 134 135 if (np) 136 of_property_read_u32(np, "#qcom,sensors", &num_sensors); 137 138 if (num_sensors <= 0) { 139 dev_err(dev, "invalid number of sensors\n"); 140 return -EINVAL; 141 } 142 143 tmdev = devm_kzalloc(dev, 144 struct_size(tmdev, sensor, num_sensors), 145 GFP_KERNEL); 146 if (!tmdev) 147 return -ENOMEM; 148 149 tmdev->dev = dev; 150 tmdev->num_sensors = num_sensors; 151 tmdev->ops = data->ops; 152 for (i = 0; i < tmdev->num_sensors; i++) { 153 if (data->hw_ids) 154 tmdev->sensor[i].hw_id = data->hw_ids[i]; 155 else 156 tmdev->sensor[i].hw_id = i; 157 } 158 159 if (!tmdev->ops || !tmdev->ops->init || !tmdev->ops->get_temp) 160 return -EINVAL; 161 162 ret = tmdev->ops->init(tmdev); 163 if (ret < 0) { 164 dev_err(dev, "tsens init failed\n"); 165 return ret; 166 } 167 168 if (tmdev->ops->calibrate) { 169 ret = tmdev->ops->calibrate(tmdev); 170 if (ret < 0) { 171 dev_err(dev, "tsens calibration failed\n"); 172 return ret; 173 } 174 } 175 176 ret = tsens_register(tmdev); 177 178 platform_set_drvdata(pdev, tmdev); 179 180 return ret; 181 } 182 183 static int tsens_remove(struct platform_device *pdev) 184 { 185 struct tsens_device *tmdev = platform_get_drvdata(pdev); 186 187 if (tmdev->ops->disable) 188 tmdev->ops->disable(tmdev); 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"); 207