1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2 as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * Copyright (C) 2012 ARM Limited 12 */ 13 14 #define DRVNAME "vexpress-hwmon" 15 #define pr_fmt(fmt) DRVNAME ": " fmt 16 17 #include <linux/device.h> 18 #include <linux/err.h> 19 #include <linux/hwmon.h> 20 #include <linux/hwmon-sysfs.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/platform_device.h> 25 #include <linux/vexpress.h> 26 27 struct vexpress_hwmon_data { 28 struct device *hwmon_dev; 29 struct regmap *reg; 30 }; 31 32 static ssize_t vexpress_hwmon_label_show(struct device *dev, 33 struct device_attribute *dev_attr, char *buffer) 34 { 35 const char *label = of_get_property(dev->of_node, "label", NULL); 36 37 return snprintf(buffer, PAGE_SIZE, "%s\n", label); 38 } 39 40 static ssize_t vexpress_hwmon_u32_show(struct device *dev, 41 struct device_attribute *dev_attr, char *buffer) 42 { 43 struct vexpress_hwmon_data *data = dev_get_drvdata(dev); 44 int err; 45 u32 value; 46 47 err = regmap_read(data->reg, 0, &value); 48 if (err) 49 return err; 50 51 return snprintf(buffer, PAGE_SIZE, "%u\n", value / 52 to_sensor_dev_attr(dev_attr)->index); 53 } 54 55 static ssize_t vexpress_hwmon_u64_show(struct device *dev, 56 struct device_attribute *dev_attr, char *buffer) 57 { 58 struct vexpress_hwmon_data *data = dev_get_drvdata(dev); 59 int err; 60 u32 value_hi, value_lo; 61 62 err = regmap_read(data->reg, 0, &value_lo); 63 if (err) 64 return err; 65 66 err = regmap_read(data->reg, 1, &value_hi); 67 if (err) 68 return err; 69 70 return snprintf(buffer, PAGE_SIZE, "%llu\n", 71 div_u64(((u64)value_hi << 32) | value_lo, 72 to_sensor_dev_attr(dev_attr)->index)); 73 } 74 75 static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj, 76 struct attribute *attr, int index) 77 { 78 struct device *dev = kobj_to_dev(kobj); 79 struct device_attribute *dev_attr = container_of(attr, 80 struct device_attribute, attr); 81 82 if (dev_attr->show == vexpress_hwmon_label_show && 83 !of_get_property(dev->of_node, "label", NULL)) 84 return 0; 85 86 return attr->mode; 87 } 88 89 struct vexpress_hwmon_type { 90 const char *name; 91 const struct attribute_group **attr_groups; 92 }; 93 94 #if !defined(CONFIG_REGULATOR_VEXPRESS) 95 static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); 96 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show, 97 NULL, 1000); 98 static struct attribute *vexpress_hwmon_attrs_volt[] = { 99 &dev_attr_in1_label.attr, 100 &sensor_dev_attr_in1_input.dev_attr.attr, 101 NULL 102 }; 103 static struct attribute_group vexpress_hwmon_group_volt = { 104 .is_visible = vexpress_hwmon_attr_is_visible, 105 .attrs = vexpress_hwmon_attrs_volt, 106 }; 107 static struct vexpress_hwmon_type vexpress_hwmon_volt = { 108 .name = "vexpress_volt", 109 .attr_groups = (const struct attribute_group *[]) { 110 &vexpress_hwmon_group_volt, 111 NULL, 112 }, 113 }; 114 #endif 115 116 static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); 117 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show, 118 NULL, 1000); 119 static struct attribute *vexpress_hwmon_attrs_amp[] = { 120 &dev_attr_curr1_label.attr, 121 &sensor_dev_attr_curr1_input.dev_attr.attr, 122 NULL 123 }; 124 static struct attribute_group vexpress_hwmon_group_amp = { 125 .is_visible = vexpress_hwmon_attr_is_visible, 126 .attrs = vexpress_hwmon_attrs_amp, 127 }; 128 static struct vexpress_hwmon_type vexpress_hwmon_amp = { 129 .name = "vexpress_amp", 130 .attr_groups = (const struct attribute_group *[]) { 131 &vexpress_hwmon_group_amp, 132 NULL 133 }, 134 }; 135 136 static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); 137 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show, 138 NULL, 1000); 139 static struct attribute *vexpress_hwmon_attrs_temp[] = { 140 &dev_attr_temp1_label.attr, 141 &sensor_dev_attr_temp1_input.dev_attr.attr, 142 NULL 143 }; 144 static struct attribute_group vexpress_hwmon_group_temp = { 145 .is_visible = vexpress_hwmon_attr_is_visible, 146 .attrs = vexpress_hwmon_attrs_temp, 147 }; 148 static struct vexpress_hwmon_type vexpress_hwmon_temp = { 149 .name = "vexpress_temp", 150 .attr_groups = (const struct attribute_group *[]) { 151 &vexpress_hwmon_group_temp, 152 NULL 153 }, 154 }; 155 156 static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); 157 static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show, 158 NULL, 1); 159 static struct attribute *vexpress_hwmon_attrs_power[] = { 160 &dev_attr_power1_label.attr, 161 &sensor_dev_attr_power1_input.dev_attr.attr, 162 NULL 163 }; 164 static struct attribute_group vexpress_hwmon_group_power = { 165 .is_visible = vexpress_hwmon_attr_is_visible, 166 .attrs = vexpress_hwmon_attrs_power, 167 }; 168 static struct vexpress_hwmon_type vexpress_hwmon_power = { 169 .name = "vexpress_power", 170 .attr_groups = (const struct attribute_group *[]) { 171 &vexpress_hwmon_group_power, 172 NULL 173 }, 174 }; 175 176 static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); 177 static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show, 178 NULL, 1); 179 static struct attribute *vexpress_hwmon_attrs_energy[] = { 180 &dev_attr_energy1_label.attr, 181 &sensor_dev_attr_energy1_input.dev_attr.attr, 182 NULL 183 }; 184 static struct attribute_group vexpress_hwmon_group_energy = { 185 .is_visible = vexpress_hwmon_attr_is_visible, 186 .attrs = vexpress_hwmon_attrs_energy, 187 }; 188 static struct vexpress_hwmon_type vexpress_hwmon_energy = { 189 .name = "vexpress_energy", 190 .attr_groups = (const struct attribute_group *[]) { 191 &vexpress_hwmon_group_energy, 192 NULL 193 }, 194 }; 195 196 static const struct of_device_id vexpress_hwmon_of_match[] = { 197 #if !defined(CONFIG_REGULATOR_VEXPRESS) 198 { 199 .compatible = "arm,vexpress-volt", 200 .data = &vexpress_hwmon_volt, 201 }, 202 #endif 203 { 204 .compatible = "arm,vexpress-amp", 205 .data = &vexpress_hwmon_amp, 206 }, { 207 .compatible = "arm,vexpress-temp", 208 .data = &vexpress_hwmon_temp, 209 }, { 210 .compatible = "arm,vexpress-power", 211 .data = &vexpress_hwmon_power, 212 }, { 213 .compatible = "arm,vexpress-energy", 214 .data = &vexpress_hwmon_energy, 215 }, 216 {} 217 }; 218 MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); 219 220 static int vexpress_hwmon_probe(struct platform_device *pdev) 221 { 222 const struct of_device_id *match; 223 struct vexpress_hwmon_data *data; 224 const struct vexpress_hwmon_type *type; 225 226 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 227 if (!data) 228 return -ENOMEM; 229 platform_set_drvdata(pdev, data); 230 231 match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); 232 if (!match) 233 return -ENODEV; 234 type = match->data; 235 236 data->reg = devm_regmap_init_vexpress_config(&pdev->dev); 237 if (IS_ERR(data->reg)) 238 return PTR_ERR(data->reg); 239 240 data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, 241 type->name, data, type->attr_groups); 242 243 return PTR_ERR_OR_ZERO(data->hwmon_dev); 244 } 245 246 static struct platform_driver vexpress_hwmon_driver = { 247 .probe = vexpress_hwmon_probe, 248 .driver = { 249 .name = DRVNAME, 250 .of_match_table = vexpress_hwmon_of_match, 251 }, 252 }; 253 254 module_platform_driver(vexpress_hwmon_driver); 255 256 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); 257 MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); 258 MODULE_LICENSE("GPL"); 259 MODULE_ALIAS("platform:vexpress-hwmon"); 260