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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
20struct vexpress_hwmon_data {
21 struct device *hwmon_dev;
22 struct regmap *reg;
23};
24
25static 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 sysfs_emit(buffer, "%s\n", label);
31}
32
33static 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 sysfs_emit(buffer, "%u\n", value /
45 to_sensor_dev_attr(dev_attr)->index);
46}
47
48static 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 sysfs_emit(buffer, "%llu\n",
64 div_u64(((u64)value_hi << 32) | value_lo,
65 to_sensor_dev_attr(dev_attr)->index));
66}
67
68static 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
82struct vexpress_hwmon_type {
83 const char *name;
84 const struct attribute_group **attr_groups;
85};
86
87#if !defined(CONFIG_REGULATOR_VEXPRESS)
88static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
89static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
90static struct attribute *vexpress_hwmon_attrs_volt[] = {
91 &dev_attr_in1_label.attr,
92 &sensor_dev_attr_in1_input.dev_attr.attr,
93 NULL
94};
95static struct attribute_group vexpress_hwmon_group_volt = {
96 .is_visible = vexpress_hwmon_attr_is_visible,
97 .attrs = vexpress_hwmon_attrs_volt,
98};
99static 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
108static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
109static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
110static struct attribute *vexpress_hwmon_attrs_amp[] = {
111 &dev_attr_curr1_label.attr,
112 &sensor_dev_attr_curr1_input.dev_attr.attr,
113 NULL
114};
115static struct attribute_group vexpress_hwmon_group_amp = {
116 .is_visible = vexpress_hwmon_attr_is_visible,
117 .attrs = vexpress_hwmon_attrs_amp,
118};
119static 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
127static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
128static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
129static struct attribute *vexpress_hwmon_attrs_temp[] = {
130 &dev_attr_temp1_label.attr,
131 &sensor_dev_attr_temp1_input.dev_attr.attr,
132 NULL
133};
134static struct attribute_group vexpress_hwmon_group_temp = {
135 .is_visible = vexpress_hwmon_attr_is_visible,
136 .attrs = vexpress_hwmon_attrs_temp,
137};
138static 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
146static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
147static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
148static struct attribute *vexpress_hwmon_attrs_power[] = {
149 &dev_attr_power1_label.attr,
150 &sensor_dev_attr_power1_input.dev_attr.attr,
151 NULL
152};
153static struct attribute_group vexpress_hwmon_group_power = {
154 .is_visible = vexpress_hwmon_attr_is_visible,
155 .attrs = vexpress_hwmon_attrs_power,
156};
157static 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
165static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
166static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
167static struct attribute *vexpress_hwmon_attrs_energy[] = {
168 &dev_attr_energy1_label.attr,
169 &sensor_dev_attr_energy1_input.dev_attr.attr,
170 NULL
171};
172static struct attribute_group vexpress_hwmon_group_energy = {
173 .is_visible = vexpress_hwmon_attr_is_visible,
174 .attrs = vexpress_hwmon_attrs_energy,
175};
176static 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
184static 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};
206MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
207
208static 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
234static 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
242module_platform_driver(vexpress_hwmon_driver);
243
244MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
245MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
246MODULE_LICENSE("GPL");
247MODULE_ALIAS("platform:vexpress-hwmon");
248
