drivers/hwmon/vexpress-hwmon.c

   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_get_property(dev->of_node, "label", NULL))
  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");