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/of_device.h> 17 #include <linux/platform_device.h> 18 #include <linux/vexpress.h> 19 20 struct vexpress_hwmon_data { 21 struct device *hwmon_dev; 22 struct regmap *reg; 23 }; 24 25 static ssize_t vexpress_hwmon_label_show(struct device *dev, 26 struct device_attribute *dev_attr, char *buffer) 27 { 28 const char *label = of_get_property(dev->of_node, "label", NULL); 29 30 return sysfs_emit(buffer, "%s\n", label); 31 } 32 33 static ssize_t vexpress_hwmon_u32_show(struct device *dev, 34 struct device_attribute *dev_attr, char *buffer) 35 { 36 struct vexpress_hwmon_data *data = dev_get_drvdata(dev); 37 int err; 38 u32 value; 39 40 err = regmap_read(data->reg, 0, &value); 41 if (err) 42 return err; 43 44 return sysfs_emit(buffer, "%u\n", value / 45 to_sensor_dev_attr(dev_attr)->index); 46 } 47 48 static ssize_t vexpress_hwmon_u64_show(struct device *dev, 49 struct device_attribute *dev_attr, char *buffer) 50 { 51 struct vexpress_hwmon_data *data = dev_get_drvdata(dev); 52 int err; 53 u32 value_hi, value_lo; 54 55 err = regmap_read(data->reg, 0, &value_lo); 56 if (err) 57 return err; 58 59 err = regmap_read(data->reg, 1, &value_hi); 60 if (err) 61 return err; 62 63 return sysfs_emit(buffer, "%llu\n", 64 div_u64(((u64)value_hi << 32) | value_lo, 65 to_sensor_dev_attr(dev_attr)->index)); 66 } 67 68 static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj, 69 struct attribute *attr, int index) 70 { 71 struct device *dev = kobj_to_dev(kobj); 72 struct device_attribute *dev_attr = container_of(attr, 73 struct device_attribute, attr); 74 75 if (dev_attr->show == vexpress_hwmon_label_show && 76 !of_get_property(dev->of_node, "label", NULL)) 77 return 0; 78 79 return attr->mode; 80 } 81 82 struct vexpress_hwmon_type { 83 const char *name; 84 const struct attribute_group **attr_groups; 85 }; 86 87 #if !defined(CONFIG_REGULATOR_VEXPRESS) 88 static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL); 89 static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000); 90 static struct attribute *vexpress_hwmon_attrs_volt[] = { 91 &dev_attr_in1_label.attr, 92 &sensor_dev_attr_in1_input.dev_attr.attr, 93 NULL 94 }; 95 static struct attribute_group vexpress_hwmon_group_volt = { 96 .is_visible = vexpress_hwmon_attr_is_visible, 97 .attrs = vexpress_hwmon_attrs_volt, 98 }; 99 static struct vexpress_hwmon_type vexpress_hwmon_volt = { 100 .name = "vexpress_volt", 101 .attr_groups = (const struct attribute_group *[]) { 102 &vexpress_hwmon_group_volt, 103 NULL, 104 }, 105 }; 106 #endif 107 108 static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL); 109 static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000); 110 static struct attribute *vexpress_hwmon_attrs_amp[] = { 111 &dev_attr_curr1_label.attr, 112 &sensor_dev_attr_curr1_input.dev_attr.attr, 113 NULL 114 }; 115 static struct attribute_group vexpress_hwmon_group_amp = { 116 .is_visible = vexpress_hwmon_attr_is_visible, 117 .attrs = vexpress_hwmon_attrs_amp, 118 }; 119 static struct vexpress_hwmon_type vexpress_hwmon_amp = { 120 .name = "vexpress_amp", 121 .attr_groups = (const struct attribute_group *[]) { 122 &vexpress_hwmon_group_amp, 123 NULL 124 }, 125 }; 126 127 static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL); 128 static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000); 129 static struct attribute *vexpress_hwmon_attrs_temp[] = { 130 &dev_attr_temp1_label.attr, 131 &sensor_dev_attr_temp1_input.dev_attr.attr, 132 NULL 133 }; 134 static struct attribute_group vexpress_hwmon_group_temp = { 135 .is_visible = vexpress_hwmon_attr_is_visible, 136 .attrs = vexpress_hwmon_attrs_temp, 137 }; 138 static struct vexpress_hwmon_type vexpress_hwmon_temp = { 139 .name = "vexpress_temp", 140 .attr_groups = (const struct attribute_group *[]) { 141 &vexpress_hwmon_group_temp, 142 NULL 143 }, 144 }; 145 146 static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL); 147 static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1); 148 static struct attribute *vexpress_hwmon_attrs_power[] = { 149 &dev_attr_power1_label.attr, 150 &sensor_dev_attr_power1_input.dev_attr.attr, 151 NULL 152 }; 153 static struct attribute_group vexpress_hwmon_group_power = { 154 .is_visible = vexpress_hwmon_attr_is_visible, 155 .attrs = vexpress_hwmon_attrs_power, 156 }; 157 static struct vexpress_hwmon_type vexpress_hwmon_power = { 158 .name = "vexpress_power", 159 .attr_groups = (const struct attribute_group *[]) { 160 &vexpress_hwmon_group_power, 161 NULL 162 }, 163 }; 164 165 static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL); 166 static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1); 167 static struct attribute *vexpress_hwmon_attrs_energy[] = { 168 &dev_attr_energy1_label.attr, 169 &sensor_dev_attr_energy1_input.dev_attr.attr, 170 NULL 171 }; 172 static struct attribute_group vexpress_hwmon_group_energy = { 173 .is_visible = vexpress_hwmon_attr_is_visible, 174 .attrs = vexpress_hwmon_attrs_energy, 175 }; 176 static struct vexpress_hwmon_type vexpress_hwmon_energy = { 177 .name = "vexpress_energy", 178 .attr_groups = (const struct attribute_group *[]) { 179 &vexpress_hwmon_group_energy, 180 NULL 181 }, 182 }; 183 184 static const struct of_device_id vexpress_hwmon_of_match[] = { 185 #if !defined(CONFIG_REGULATOR_VEXPRESS) 186 { 187 .compatible = "arm,vexpress-volt", 188 .data = &vexpress_hwmon_volt, 189 }, 190 #endif 191 { 192 .compatible = "arm,vexpress-amp", 193 .data = &vexpress_hwmon_amp, 194 }, { 195 .compatible = "arm,vexpress-temp", 196 .data = &vexpress_hwmon_temp, 197 }, { 198 .compatible = "arm,vexpress-power", 199 .data = &vexpress_hwmon_power, 200 }, { 201 .compatible = "arm,vexpress-energy", 202 .data = &vexpress_hwmon_energy, 203 }, 204 {} 205 }; 206 MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); 207 208 static int vexpress_hwmon_probe(struct platform_device *pdev) 209 { 210 const struct of_device_id *match; 211 struct vexpress_hwmon_data *data; 212 const struct vexpress_hwmon_type *type; 213 214 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 215 if (!data) 216 return -ENOMEM; 217 platform_set_drvdata(pdev, data); 218 219 match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); 220 if (!match) 221 return -ENODEV; 222 type = match->data; 223 224 data->reg = devm_regmap_init_vexpress_config(&pdev->dev); 225 if (IS_ERR(data->reg)) 226 return PTR_ERR(data->reg); 227 228 data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, 229 type->name, data, type->attr_groups); 230 231 return PTR_ERR_OR_ZERO(data->hwmon_dev); 232 } 233 234 static struct platform_driver vexpress_hwmon_driver = { 235 .probe = vexpress_hwmon_probe, 236 .driver = { 237 .name = DRVNAME, 238 .of_match_table = vexpress_hwmon_of_match, 239 }, 240 }; 241 242 module_platform_driver(vexpress_hwmon_driver); 243 244 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); 245 MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); 246 MODULE_LICENSE("GPL"); 247 MODULE_ALIAS("platform:vexpress-hwmon"); 248