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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
48ed8877 | 2 | /* |
48ed8877 PM |
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> | |
08245ad8 | 15 | #include <linux/of.h> |
48ed8877 PM |
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; | |
3b9334ac | 22 | struct regmap *reg; |
48ed8877 PM |
23 | }; |
24 | ||
48ed8877 PM |
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 | ||
48ed8877 PM |
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 | ||
3b9334ac | 40 | err = regmap_read(data->reg, 0, &value); |
48ed8877 PM |
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 | ||
3b9334ac | 55 | err = regmap_read(data->reg, 0, &value_lo); |
48ed8877 PM |
56 | if (err) |
57 | return err; | |
58 | ||
3b9334ac | 59 | err = regmap_read(data->reg, 1, &value_hi); |
48ed8877 PM |
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 | ||
b2e5411e PM |
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 | ||
52feaca5 PM |
82 | struct vexpress_hwmon_type { |
83 | const char *name; | |
84 | const struct attribute_group **attr_groups; | |
85 | }; | |
86 | ||
48ed8877 | 87 | #if !defined(CONFIG_REGULATOR_VEXPRESS) |
fa75f745 GR |
88 | static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL); |
89 | static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000); | |
78cebd08 PM |
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 | }; | |
48ed8877 | 95 | static struct attribute_group vexpress_hwmon_group_volt = { |
b2e5411e | 96 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
97 | .attrs = vexpress_hwmon_attrs_volt, |
98 | }; | |
52feaca5 PM |
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 | }; | |
48ed8877 PM |
106 | #endif |
107 | ||
fa75f745 GR |
108 | static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL); |
109 | static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000); | |
78cebd08 PM |
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 | }; | |
48ed8877 | 115 | static struct attribute_group vexpress_hwmon_group_amp = { |
b2e5411e | 116 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
117 | .attrs = vexpress_hwmon_attrs_amp, |
118 | }; | |
52feaca5 PM |
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 | }; | |
48ed8877 | 126 | |
fa75f745 GR |
127 | static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL); |
128 | static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000); | |
78cebd08 PM |
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 | }; | |
48ed8877 | 134 | static struct attribute_group vexpress_hwmon_group_temp = { |
b2e5411e | 135 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
136 | .attrs = vexpress_hwmon_attrs_temp, |
137 | }; | |
52feaca5 PM |
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 | }; | |
48ed8877 | 145 | |
fa75f745 GR |
146 | static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL); |
147 | static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1); | |
78cebd08 PM |
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 | }; | |
48ed8877 | 153 | static struct attribute_group vexpress_hwmon_group_power = { |
b2e5411e | 154 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
155 | .attrs = vexpress_hwmon_attrs_power, |
156 | }; | |
52feaca5 PM |
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 | }; | |
48ed8877 | 164 | |
fa75f745 GR |
165 | static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL); |
166 | static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1); | |
78cebd08 PM |
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 | }; | |
48ed8877 | 172 | static struct attribute_group vexpress_hwmon_group_energy = { |
b2e5411e | 173 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
174 | .attrs = vexpress_hwmon_attrs_energy, |
175 | }; | |
52feaca5 PM |
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 | }; | |
48ed8877 | 183 | |
d720acac | 184 | static const struct of_device_id vexpress_hwmon_of_match[] = { |
48ed8877 PM |
185 | #if !defined(CONFIG_REGULATOR_VEXPRESS) |
186 | { | |
187 | .compatible = "arm,vexpress-volt", | |
52feaca5 | 188 | .data = &vexpress_hwmon_volt, |
48ed8877 PM |
189 | }, |
190 | #endif | |
191 | { | |
192 | .compatible = "arm,vexpress-amp", | |
52feaca5 | 193 | .data = &vexpress_hwmon_amp, |
48ed8877 PM |
194 | }, { |
195 | .compatible = "arm,vexpress-temp", | |
52feaca5 | 196 | .data = &vexpress_hwmon_temp, |
48ed8877 PM |
197 | }, { |
198 | .compatible = "arm,vexpress-power", | |
52feaca5 | 199 | .data = &vexpress_hwmon_power, |
48ed8877 PM |
200 | }, { |
201 | .compatible = "arm,vexpress-energy", | |
52feaca5 | 202 | .data = &vexpress_hwmon_energy, |
48ed8877 PM |
203 | }, |
204 | {} | |
205 | }; | |
206 | MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); | |
207 | ||
208 | static int vexpress_hwmon_probe(struct platform_device *pdev) | |
209 | { | |
48ed8877 PM |
210 | const struct of_device_id *match; |
211 | struct vexpress_hwmon_data *data; | |
52feaca5 | 212 | const struct vexpress_hwmon_type *type; |
48ed8877 PM |
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; | |
52feaca5 | 222 | type = match->data; |
48ed8877 | 223 | |
3b9334ac PM |
224 | data->reg = devm_regmap_init_vexpress_config(&pdev->dev); |
225 | if (IS_ERR(data->reg)) | |
226 | return PTR_ERR(data->reg); | |
48ed8877 | 227 | |
78cebd08 PM |
228 | data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, |
229 | type->name, data, type->attr_groups); | |
48ed8877 | 230 | |
78cebd08 | 231 | return PTR_ERR_OR_ZERO(data->hwmon_dev); |
48ed8877 PM |
232 | } |
233 | ||
234 | static struct platform_driver vexpress_hwmon_driver = { | |
235 | .probe = vexpress_hwmon_probe, | |
48ed8877 PM |
236 | .driver = { |
237 | .name = DRVNAME, | |
48ed8877 PM |
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"); |