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/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 snprintf(buffer, PAGE_SIZE, "%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 snprintf(buffer, PAGE_SIZE, "%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 snprintf(buffer, PAGE_SIZE, "%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");