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_get_property(dev->of_node, "label", NULL))
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