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
vexpress_hwmon_label_show(struct device * dev,struct device_attribute * dev_attr,char * buffer)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
vexpress_hwmon_u32_show(struct device * dev,struct device_attribute * dev_attr,char * buffer)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
vexpress_hwmon_u64_show(struct device * dev,struct device_attribute * dev_attr,char * buffer)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
vexpress_hwmon_attr_is_visible(struct kobject * kobj,struct attribute * attr,int index)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_property_present(dev->of_node, "label"))
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
vexpress_hwmon_probe(struct platform_device * pdev)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");
245