1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Copyright (C) 2012 ARM Limited 5 */ 6 7 #define DRVNAME "vexpress-hwmon" 8 #define pr_fmt(fmt) DRVNAME ": " fmt 9 10 #include <linux/device.h> 11 #include <linux/err.h> 12 #include <linux/hwmon.h> 13 #include <linux/hwmon-sysfs.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/vexpress.h> 18 19 struct vexpress_hwmon_data { 20 struct device *hwmon_dev; 21 struct regmap *reg; 22 }; 23 24 static ssize_t vexpress_hwmon_label_show(struct device *dev, 25 struct device_attribute *dev_attr, char *buffer) 26 { 27 const char *label = of_get_property(dev->of_node, "label", NULL); 28 29 return sysfs_emit(buffer, "%s\n", label); 30 } 31 32 static ssize_t vexpress_hwmon_u32_show(struct device *dev, 33 struct device_attribute *dev_attr, char *buffer) 34 { 35 struct vexpress_hwmon_data *data = dev_get_drvdata(dev); 36 int err; 37 u32 value; 38 39 err = regmap_read(data->reg, 0, &value); 40 if (err) 41 return err; 42 43 return sysfs_emit(buffer, "%u\n", value / 44 to_sensor_dev_attr(dev_attr)->index); 45 } 46 47 static ssize_t vexpress_hwmon_u64_show(struct device *dev, 48 struct device_attribute *dev_attr, char *buffer) 49 { 50 struct vexpress_hwmon_data *data = dev_get_drvdata(dev); 51 int err; 52 u32 value_hi, value_lo; 53 54 err = regmap_read(data->reg, 0, &value_lo); 55 if (err) 56 return err; 57 58 err = regmap_read(data->reg, 1, &value_hi); 59 if (err) 60 return err; 61 62 return sysfs_emit(buffer, "%llu\n", 63 div_u64(((u64)value_hi << 32) | value_lo, 64 to_sensor_dev_attr(dev_attr)->index)); 65 } 66 67 static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj, 68 struct attribute *attr, int index) 69 { 70 struct device *dev = kobj_to_dev(kobj); 71 struct device_attribute *dev_attr = container_of(attr, 72 struct device_attribute, attr); 73 74 if (dev_attr->show == vexpress_hwmon_label_show && 75 !of_property_present(dev->of_node, "label")) 76 return 0; 77 78 return attr->mode; 79 } 80 81 struct vexpress_hwmon_type { 82 const char *name; 83 const struct attribute_group **attr_groups; 84 }; 85 86 #if !defined(CONFIG_REGULATOR_VEXPRESS) 87 static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL); 88 static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000); 89 static struct attribute *vexpress_hwmon_attrs_volt[] = { 90 &dev_attr_in1_label.attr, 91 &sensor_dev_attr_in1_input.dev_attr.attr, 92 NULL 93 }; 94 static struct attribute_group vexpress_hwmon_group_volt = { 95 .is_visible = vexpress_hwmon_attr_is_visible, 96 .attrs = vexpress_hwmon_attrs_volt, 97 }; 98 static struct vexpress_hwmon_type vexpress_hwmon_volt = { 99 .name = "vexpress_volt", 100 .attr_groups = (const struct attribute_group *[]) { 101 &vexpress_hwmon_group_volt, 102 NULL, 103 }, 104 }; 105 #endif 106 107 static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL); 108 static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000); 109 static struct attribute *vexpress_hwmon_attrs_amp[] = { 110 &dev_attr_curr1_label.attr, 111 &sensor_dev_attr_curr1_input.dev_attr.attr, 112 NULL 113 }; 114 static struct attribute_group vexpress_hwmon_group_amp = { 115 .is_visible = vexpress_hwmon_attr_is_visible, 116 .attrs = vexpress_hwmon_attrs_amp, 117 }; 118 static struct vexpress_hwmon_type vexpress_hwmon_amp = { 119 .name = "vexpress_amp", 120 .attr_groups = (const struct attribute_group *[]) { 121 &vexpress_hwmon_group_amp, 122 NULL 123 }, 124 }; 125 126 static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL); 127 static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000); 128 static struct attribute *vexpress_hwmon_attrs_temp[] = { 129 &dev_attr_temp1_label.attr, 130 &sensor_dev_attr_temp1_input.dev_attr.attr, 131 NULL 132 }; 133 static struct attribute_group vexpress_hwmon_group_temp = { 134 .is_visible = vexpress_hwmon_attr_is_visible, 135 .attrs = vexpress_hwmon_attrs_temp, 136 }; 137 static struct vexpress_hwmon_type vexpress_hwmon_temp = { 138 .name = "vexpress_temp", 139 .attr_groups = (const struct attribute_group *[]) { 140 &vexpress_hwmon_group_temp, 141 NULL 142 }, 143 }; 144 145 static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL); 146 static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1); 147 static struct attribute *vexpress_hwmon_attrs_power[] = { 148 &dev_attr_power1_label.attr, 149 &sensor_dev_attr_power1_input.dev_attr.attr, 150 NULL 151 }; 152 static struct attribute_group vexpress_hwmon_group_power = { 153 .is_visible = vexpress_hwmon_attr_is_visible, 154 .attrs = vexpress_hwmon_attrs_power, 155 }; 156 static struct vexpress_hwmon_type vexpress_hwmon_power = { 157 .name = "vexpress_power", 158 .attr_groups = (const struct attribute_group *[]) { 159 &vexpress_hwmon_group_power, 160 NULL 161 }, 162 }; 163 164 static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL); 165 static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1); 166 static struct attribute *vexpress_hwmon_attrs_energy[] = { 167 &dev_attr_energy1_label.attr, 168 &sensor_dev_attr_energy1_input.dev_attr.attr, 169 NULL 170 }; 171 static struct attribute_group vexpress_hwmon_group_energy = { 172 .is_visible = vexpress_hwmon_attr_is_visible, 173 .attrs = vexpress_hwmon_attrs_energy, 174 }; 175 static struct vexpress_hwmon_type vexpress_hwmon_energy = { 176 .name = "vexpress_energy", 177 .attr_groups = (const struct attribute_group *[]) { 178 &vexpress_hwmon_group_energy, 179 NULL 180 }, 181 }; 182 183 static const struct of_device_id vexpress_hwmon_of_match[] = { 184 #if !defined(CONFIG_REGULATOR_VEXPRESS) 185 { 186 .compatible = "arm,vexpress-volt", 187 .data = &vexpress_hwmon_volt, 188 }, 189 #endif 190 { 191 .compatible = "arm,vexpress-amp", 192 .data = &vexpress_hwmon_amp, 193 }, { 194 .compatible = "arm,vexpress-temp", 195 .data = &vexpress_hwmon_temp, 196 }, { 197 .compatible = "arm,vexpress-power", 198 .data = &vexpress_hwmon_power, 199 }, { 200 .compatible = "arm,vexpress-energy", 201 .data = &vexpress_hwmon_energy, 202 }, 203 {} 204 }; 205 MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); 206 207 static int vexpress_hwmon_probe(struct platform_device *pdev) 208 { 209 struct vexpress_hwmon_data *data; 210 const struct vexpress_hwmon_type *type; 211 212 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 213 if (!data) 214 return -ENOMEM; 215 platform_set_drvdata(pdev, data); 216 217 type = of_device_get_match_data(&pdev->dev); 218 if (!type) 219 return -ENODEV; 220 221 data->reg = devm_regmap_init_vexpress_config(&pdev->dev); 222 if (IS_ERR(data->reg)) 223 return PTR_ERR(data->reg); 224 225 data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, 226 type->name, data, type->attr_groups); 227 228 return PTR_ERR_OR_ZERO(data->hwmon_dev); 229 } 230 231 static struct platform_driver vexpress_hwmon_driver = { 232 .probe = vexpress_hwmon_probe, 233 .driver = { 234 .name = DRVNAME, 235 .of_match_table = vexpress_hwmon_of_match, 236 }, 237 }; 238 239 module_platform_driver(vexpress_hwmon_driver); 240 241 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); 242 MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); 243 MODULE_LICENSE("GPL"); 244 MODULE_ALIAS("platform:vexpress-hwmon"); 245