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, 0444, vexpress_hwmon_label_show, NULL); 96 static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000); 97 static struct attribute *vexpress_hwmon_attrs_volt[] = { 98 &dev_attr_in1_label.attr, 99 &sensor_dev_attr_in1_input.dev_attr.attr, 100 NULL 101 }; 102 static struct attribute_group vexpress_hwmon_group_volt = { 103 .is_visible = vexpress_hwmon_attr_is_visible, 104 .attrs = vexpress_hwmon_attrs_volt, 105 }; 106 static struct vexpress_hwmon_type vexpress_hwmon_volt = { 107 .name = "vexpress_volt", 108 .attr_groups = (const struct attribute_group *[]) { 109 &vexpress_hwmon_group_volt, 110 NULL, 111 }, 112 }; 113 #endif 114 115 static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL); 116 static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000); 117 static struct attribute *vexpress_hwmon_attrs_amp[] = { 118 &dev_attr_curr1_label.attr, 119 &sensor_dev_attr_curr1_input.dev_attr.attr, 120 NULL 121 }; 122 static struct attribute_group vexpress_hwmon_group_amp = { 123 .is_visible = vexpress_hwmon_attr_is_visible, 124 .attrs = vexpress_hwmon_attrs_amp, 125 }; 126 static struct vexpress_hwmon_type vexpress_hwmon_amp = { 127 .name = "vexpress_amp", 128 .attr_groups = (const struct attribute_group *[]) { 129 &vexpress_hwmon_group_amp, 130 NULL 131 }, 132 }; 133 134 static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL); 135 static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000); 136 static struct attribute *vexpress_hwmon_attrs_temp[] = { 137 &dev_attr_temp1_label.attr, 138 &sensor_dev_attr_temp1_input.dev_attr.attr, 139 NULL 140 }; 141 static struct attribute_group vexpress_hwmon_group_temp = { 142 .is_visible = vexpress_hwmon_attr_is_visible, 143 .attrs = vexpress_hwmon_attrs_temp, 144 }; 145 static struct vexpress_hwmon_type vexpress_hwmon_temp = { 146 .name = "vexpress_temp", 147 .attr_groups = (const struct attribute_group *[]) { 148 &vexpress_hwmon_group_temp, 149 NULL 150 }, 151 }; 152 153 static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL); 154 static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1); 155 static struct attribute *vexpress_hwmon_attrs_power[] = { 156 &dev_attr_power1_label.attr, 157 &sensor_dev_attr_power1_input.dev_attr.attr, 158 NULL 159 }; 160 static struct attribute_group vexpress_hwmon_group_power = { 161 .is_visible = vexpress_hwmon_attr_is_visible, 162 .attrs = vexpress_hwmon_attrs_power, 163 }; 164 static struct vexpress_hwmon_type vexpress_hwmon_power = { 165 .name = "vexpress_power", 166 .attr_groups = (const struct attribute_group *[]) { 167 &vexpress_hwmon_group_power, 168 NULL 169 }, 170 }; 171 172 static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL); 173 static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1); 174 static struct attribute *vexpress_hwmon_attrs_energy[] = { 175 &dev_attr_energy1_label.attr, 176 &sensor_dev_attr_energy1_input.dev_attr.attr, 177 NULL 178 }; 179 static struct attribute_group vexpress_hwmon_group_energy = { 180 .is_visible = vexpress_hwmon_attr_is_visible, 181 .attrs = vexpress_hwmon_attrs_energy, 182 }; 183 static struct vexpress_hwmon_type vexpress_hwmon_energy = { 184 .name = "vexpress_energy", 185 .attr_groups = (const struct attribute_group *[]) { 186 &vexpress_hwmon_group_energy, 187 NULL 188 }, 189 }; 190 191 static const struct of_device_id vexpress_hwmon_of_match[] = { 192 #if !defined(CONFIG_REGULATOR_VEXPRESS) 193 { 194 .compatible = "arm,vexpress-volt", 195 .data = &vexpress_hwmon_volt, 196 }, 197 #endif 198 { 199 .compatible = "arm,vexpress-amp", 200 .data = &vexpress_hwmon_amp, 201 }, { 202 .compatible = "arm,vexpress-temp", 203 .data = &vexpress_hwmon_temp, 204 }, { 205 .compatible = "arm,vexpress-power", 206 .data = &vexpress_hwmon_power, 207 }, { 208 .compatible = "arm,vexpress-energy", 209 .data = &vexpress_hwmon_energy, 210 }, 211 {} 212 }; 213 MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); 214 215 static int vexpress_hwmon_probe(struct platform_device *pdev) 216 { 217 const struct of_device_id *match; 218 struct vexpress_hwmon_data *data; 219 const struct vexpress_hwmon_type *type; 220 221 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 222 if (!data) 223 return -ENOMEM; 224 platform_set_drvdata(pdev, data); 225 226 match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); 227 if (!match) 228 return -ENODEV; 229 type = match->data; 230 231 data->reg = devm_regmap_init_vexpress_config(&pdev->dev); 232 if (IS_ERR(data->reg)) 233 return PTR_ERR(data->reg); 234 235 data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, 236 type->name, data, type->attr_groups); 237 238 return PTR_ERR_OR_ZERO(data->hwmon_dev); 239 } 240 241 static struct platform_driver vexpress_hwmon_driver = { 242 .probe = vexpress_hwmon_probe, 243 .driver = { 244 .name = DRVNAME, 245 .of_match_table = vexpress_hwmon_of_match, 246 }, 247 }; 248 249 module_platform_driver(vexpress_hwmon_driver); 250 251 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); 252 MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); 253 MODULE_LICENSE("GPL"); 254 MODULE_ALIAS("platform:vexpress-hwmon"); 255