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