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_irq(struct tsens_priv *priv, char *irqname, 89 irq_handler_t thread_fn) 90 { 91 struct platform_device *pdev; 92 int ret, irq; 93 94 pdev = of_find_device_by_node(priv->dev->of_node); 95 if (!pdev) 96 return -ENODEV; 97 98 irq = platform_get_irq_byname(pdev, irqname); 99 if (irq < 0) { 100 ret = irq; 101 /* For old DTs with no IRQ defined */ 102 if (irq == -ENXIO) 103 ret = 0; 104 } else { 105 ret = devm_request_threaded_irq(&pdev->dev, irq, 106 NULL, thread_fn, 107 IRQF_ONESHOT, 108 dev_name(&pdev->dev), priv); 109 if (ret) 110 dev_err(&pdev->dev, "%s: failed to get irq\n", 111 __func__); 112 else 113 enable_irq_wake(irq); 114 } 115 116 put_device(&pdev->dev); 117 return ret; 118 } 119 120 static int tsens_register(struct tsens_priv *priv) 121 { 122 int i, ret; 123 struct thermal_zone_device *tzd; 124 125 for (i = 0; i < priv->num_sensors; i++) { 126 priv->sensor[i].priv = priv; 127 tzd = devm_thermal_zone_of_sensor_register(priv->dev, priv->sensor[i].hw_id, 128 &priv->sensor[i], 129 &tsens_of_ops); 130 if (IS_ERR(tzd)) 131 continue; 132 priv->sensor[i].tzd = tzd; 133 if (priv->ops->enable) 134 priv->ops->enable(priv, i); 135 } 136 137 ret = tsens_register_irq(priv, "uplow", tsens_irq_thread); 138 if (ret < 0) 139 return ret; 140 141 if (priv->feat->crit_int) 142 ret = tsens_register_irq(priv, "critical", 143 tsens_critical_irq_thread); 144 145 return ret; 146 } 147 148 static int tsens_probe(struct platform_device *pdev) 149 { 150 int ret, i; 151 struct device *dev; 152 struct device_node *np; 153 struct tsens_priv *priv; 154 const struct tsens_plat_data *data; 155 const struct of_device_id *id; 156 u32 num_sensors; 157 158 if (pdev->dev.of_node) 159 dev = &pdev->dev; 160 else 161 dev = pdev->dev.parent; 162 163 np = dev->of_node; 164 165 id = of_match_node(tsens_table, np); 166 if (id) 167 data = id->data; 168 else 169 data = &data_8960; 170 171 num_sensors = data->num_sensors; 172 173 if (np) 174 of_property_read_u32(np, "#qcom,sensors", &num_sensors); 175 176 if (num_sensors <= 0) { 177 dev_err(dev, "%s: invalid number of sensors\n", __func__); 178 return -EINVAL; 179 } 180 181 priv = devm_kzalloc(dev, 182 struct_size(priv, sensor, num_sensors), 183 GFP_KERNEL); 184 if (!priv) 185 return -ENOMEM; 186 187 priv->dev = dev; 188 priv->num_sensors = num_sensors; 189 priv->ops = data->ops; 190 for (i = 0; i < priv->num_sensors; i++) { 191 if (data->hw_ids) 192 priv->sensor[i].hw_id = data->hw_ids[i]; 193 else 194 priv->sensor[i].hw_id = i; 195 } 196 priv->feat = data->feat; 197 priv->fields = data->fields; 198 199 platform_set_drvdata(pdev, priv); 200 201 if (!priv->ops || !priv->ops->init || !priv->ops->get_temp) 202 return -EINVAL; 203 204 ret = priv->ops->init(priv); 205 if (ret < 0) { 206 dev_err(dev, "%s: init failed\n", __func__); 207 return ret; 208 } 209 210 if (priv->ops->calibrate) { 211 ret = priv->ops->calibrate(priv); 212 if (ret < 0) { 213 if (ret != -EPROBE_DEFER) 214 dev_err(dev, "%s: calibration failed\n", __func__); 215 return ret; 216 } 217 } 218 219 return tsens_register(priv); 220 } 221 222 static int tsens_remove(struct platform_device *pdev) 223 { 224 struct tsens_priv *priv = platform_get_drvdata(pdev); 225 226 debugfs_remove_recursive(priv->debug_root); 227 tsens_disable_irq(priv); 228 if (priv->ops->disable) 229 priv->ops->disable(priv); 230 231 return 0; 232 } 233 234 static struct platform_driver tsens_driver = { 235 .probe = tsens_probe, 236 .remove = tsens_remove, 237 .driver = { 238 .name = "qcom-tsens", 239 .pm = &tsens_pm_ops, 240 .of_match_table = tsens_table, 241 }, 242 }; 243 module_platform_driver(tsens_driver); 244 245 MODULE_LICENSE("GPL v2"); 246 MODULE_DESCRIPTION("QCOM Temperature Sensor driver"); 247 MODULE_ALIAS("platform:qcom-tsens"); 248