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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
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 snprintf(buffer, PAGE_SIZE, "%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 snprintf(buffer, PAGE_SIZE, "%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 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
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");
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
19struct vexpress_hwmon_data {
20 struct device *hwmon_dev;
21 struct regmap *reg;
22};
23
24static 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
32static 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
47static 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
67static 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_get_property(dev->of_node, "label", NULL))
76 return 0;
77
78 return attr->mode;
79}
80
81struct vexpress_hwmon_type {
82 const char *name;
83 const struct attribute_group **attr_groups;
84};
85
86#if !defined(CONFIG_REGULATOR_VEXPRESS)
87static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
88static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
89static struct attribute *vexpress_hwmon_attrs_volt[] = {
90 &dev_attr_in1_label.attr,
91 &sensor_dev_attr_in1_input.dev_attr.attr,
92 NULL
93};
94static struct attribute_group vexpress_hwmon_group_volt = {
95 .is_visible = vexpress_hwmon_attr_is_visible,
96 .attrs = vexpress_hwmon_attrs_volt,
97};
98static 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
107static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
108static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
109static struct attribute *vexpress_hwmon_attrs_amp[] = {
110 &dev_attr_curr1_label.attr,
111 &sensor_dev_attr_curr1_input.dev_attr.attr,
112 NULL
113};
114static struct attribute_group vexpress_hwmon_group_amp = {
115 .is_visible = vexpress_hwmon_attr_is_visible,
116 .attrs = vexpress_hwmon_attrs_amp,
117};
118static 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
126static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
127static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
128static struct attribute *vexpress_hwmon_attrs_temp[] = {
129 &dev_attr_temp1_label.attr,
130 &sensor_dev_attr_temp1_input.dev_attr.attr,
131 NULL
132};
133static struct attribute_group vexpress_hwmon_group_temp = {
134 .is_visible = vexpress_hwmon_attr_is_visible,
135 .attrs = vexpress_hwmon_attrs_temp,
136};
137static 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
145static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
146static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
147static struct attribute *vexpress_hwmon_attrs_power[] = {
148 &dev_attr_power1_label.attr,
149 &sensor_dev_attr_power1_input.dev_attr.attr,
150 NULL
151};
152static struct attribute_group vexpress_hwmon_group_power = {
153 .is_visible = vexpress_hwmon_attr_is_visible,
154 .attrs = vexpress_hwmon_attrs_power,
155};
156static 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
164static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
165static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
166static struct attribute *vexpress_hwmon_attrs_energy[] = {
167 &dev_attr_energy1_label.attr,
168 &sensor_dev_attr_energy1_input.dev_attr.attr,
169 NULL
170};
171static struct attribute_group vexpress_hwmon_group_energy = {
172 .is_visible = vexpress_hwmon_attr_is_visible,
173 .attrs = vexpress_hwmon_attrs_energy,
174};
175static 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
183static 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};
205MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
206
207static 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
231static 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
239module_platform_driver(vexpress_hwmon_driver);
240
241MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
242MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
243MODULE_LICENSE("GPL");
244MODULE_ALIAS("platform:vexpress-hwmon");