1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2015, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/debugfs.h> 7 #include <linux/err.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/of_platform.h> 11 #include <linux/platform_device.h> 12 #include <linux/pm.h> 13 #include <linux/slab.h> 14 #include <linux/thermal.h> 15 #include "tsens.h" 16 17 static int tsens_get_temp(void *data, int *temp) 18 { 19 struct tsens_sensor *s = data; 20 struct tsens_priv *priv = s->priv; 21 22 return priv->ops->get_temp(s, temp); 23 } 24 25 static int tsens_get_trend(void *data, int trip, enum thermal_trend *trend) 26 { 27 struct tsens_sensor *s = data; 28 struct tsens_priv *priv = s->priv; 29 30 if (priv->ops->get_trend) 31 return priv->ops->get_trend(s, trend); 32 33 return -ENOTSUPP; 34 } 35 36 static int __maybe_unused tsens_suspend(struct device *dev) 37 { 38 struct tsens_priv *priv = dev_get_drvdata(dev); 39 40 if (priv->ops && priv->ops->suspend) 41 return priv->ops->suspend(priv); 42 43 return 0; 44 } 45 46 static int __maybe_unused tsens_resume(struct device *dev) 47 { 48 struct tsens_priv *priv = dev_get_drvdata(dev); 49 50 if (priv->ops && priv->ops->resume) 51 return priv->ops->resume(priv); 52 53 return 0; 54 } 55 56 static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume); 57 58 static const struct of_device_id tsens_table[] = { 59 { 60 .compatible = "qcom,msm8916-tsens", 61 .data = &data_8916, 62 }, { 63 .compatible = "qcom,msm8974-tsens", 64 .data = &data_8974, 65 }, { 66 .compatible = "qcom,msm8976-tsens", 67 .data = &data_8976, 68 }, { 69 .compatible = "qcom,msm8996-tsens", 70 .data = &data_8996, 71 }, { 72 .compatible = "qcom,tsens-v1", 73 .data = &data_tsens_v1, 74 }, { 75 .compatible = "qcom,tsens-v2", 76 .data = &data_tsens_v2, 77 }, 78 {} 79 }; 80 MODULE_DEVICE_TABLE(of, tsens_table); 81 82 static const struct thermal_zone_of_device_ops tsens_of_ops = { 83 .get_temp = tsens_get_temp, 84 .get_trend = tsens_get_trend, 85 .set_trips = tsens_set_trips, 86 }; 87 88 static int tsens_register(struct tsens_priv *priv) 89 { 90 int i, ret, irq; 91 struct thermal_zone_device *tzd; 92 struct platform_device *pdev; 93 94 for (i = 0; i < priv->num_sensors; i++) { 95 priv->sensor[i].priv = priv; 96 tzd = devm_thermal_zone_of_sensor_register(priv->dev, priv->sensor[i].hw_id, 97 &priv->sensor[i], 98 &tsens_of_ops); 99 if (IS_ERR(tzd)) 100 continue; 101 priv->sensor[i].tzd = tzd; 102 if (priv->ops->enable) 103 priv->ops->enable(priv, i); 104 } 105 106 pdev = of_find_device_by_node(priv->dev->of_node); 107 if (!pdev) 108 return -ENODEV; 109 110 irq = platform_get_irq_byname(pdev, "uplow"); 111 if (irq < 0) { 112 ret = irq; 113 /* For old DTs with no IRQ defined */ 114 if (irq == -ENXIO) 115 ret = 0; 116 goto err_put_device; 117 } 118 119 ret = devm_request_threaded_irq(&pdev->dev, irq, 120 NULL, tsens_irq_thread, 121 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 122 dev_name(&pdev->dev), priv); 123 if (ret) { 124 dev_err(&pdev->dev, "%s: failed to get irq\n", __func__); 125 goto err_put_device; 126 } 127 128 enable_irq_wake(irq); 129 130 err_put_device: 131 put_device(&pdev->dev); 132 return ret; 133 } 134 135 static int tsens_probe(struct platform_device *pdev) 136 { 137 int ret, i; 138 struct device *dev; 139 struct device_node *np; 140 struct tsens_priv *priv; 141 const struct tsens_plat_data *data; 142 const struct of_device_id *id; 143 u32 num_sensors; 144 145 if (pdev->dev.of_node) 146 dev = &pdev->dev; 147 else 148 dev = pdev->dev.parent; 149 150 np = dev->of_node; 151 152 id = of_match_node(tsens_table, np); 153 if (id) 154 data = id->data; 155 else 156 data = &data_8960; 157 158 num_sensors = data->num_sensors; 159 160 if (np) 161 of_property_read_u32(np, "#qcom,sensors", &num_sensors); 162 163 if (num_sensors <= 0) { 164 dev_err(dev, "%s: invalid number of sensors\n", __func__); 165 return -EINVAL; 166 } 167 168 priv = devm_kzalloc(dev, 169 struct_size(priv, sensor, num_sensors), 170 GFP_KERNEL); 171 if (!priv) 172 return -ENOMEM; 173 174 priv->dev = dev; 175 priv->num_sensors = num_sensors; 176 priv->ops = data->ops; 177 for (i = 0; i < priv->num_sensors; i++) { 178 if (data->hw_ids) 179 priv->sensor[i].hw_id = data->hw_ids[i]; 180 else 181 priv->sensor[i].hw_id = i; 182 } 183 priv->feat = data->feat; 184 priv->fields = data->fields; 185 186 platform_set_drvdata(pdev, priv); 187 188 if (!priv->ops || !priv->ops->init || !priv->ops->get_temp) 189 return -EINVAL; 190 191 ret = priv->ops->init(priv); 192 if (ret < 0) { 193 dev_err(dev, "%s: init failed\n", __func__); 194 return ret; 195 } 196 197 if (priv->ops->calibrate) { 198 ret = priv->ops->calibrate(priv); 199 if (ret < 0) { 200 if (ret != -EPROBE_DEFER) 201 dev_err(dev, "%s: calibration failed\n", __func__); 202 return ret; 203 } 204 } 205 206 return tsens_register(priv); 207 } 208 209 static int tsens_remove(struct platform_device *pdev) 210 { 211 struct tsens_priv *priv = platform_get_drvdata(pdev); 212 213 debugfs_remove_recursive(priv->debug_root); 214 tsens_disable_irq(priv); 215 if (priv->ops->disable) 216 priv->ops->disable(priv); 217 218 return 0; 219 } 220 221 static struct platform_driver tsens_driver = { 222 .probe = tsens_probe, 223 .remove = tsens_remove, 224 .driver = { 225 .name = "qcom-tsens", 226 .pm = &tsens_pm_ops, 227 .of_match_table = tsens_table, 228 }, 229 }; 230 module_platform_driver(tsens_driver); 231 232 MODULE_LICENSE("GPL v2"); 233 MODULE_DESCRIPTION("QCOM Temperature Sensor driver"); 234 MODULE_ALIAS("platform:qcom-tsens"); 235