Commit | Line | Data |
---|---|---|
48ed8877 PM |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * Copyright (C) 2012 ARM Limited | |
12 | */ | |
13 | ||
14 | #define DRVNAME "vexpress-hwmon" | |
15 | #define pr_fmt(fmt) DRVNAME ": " fmt | |
16 | ||
17 | #include <linux/device.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/hwmon.h> | |
20 | #include <linux/hwmon-sysfs.h> | |
21 | #include <linux/module.h> | |
08245ad8 | 22 | #include <linux/of.h> |
48ed8877 PM |
23 | #include <linux/of_device.h> |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/vexpress.h> | |
26 | ||
27 | struct vexpress_hwmon_data { | |
28 | struct device *hwmon_dev; | |
3b9334ac | 29 | struct regmap *reg; |
48ed8877 PM |
30 | }; |
31 | ||
48ed8877 PM |
32 | static ssize_t vexpress_hwmon_label_show(struct device *dev, |
33 | struct device_attribute *dev_attr, char *buffer) | |
34 | { | |
35 | const char *label = of_get_property(dev->of_node, "label", NULL); | |
36 | ||
48ed8877 PM |
37 | return snprintf(buffer, PAGE_SIZE, "%s\n", label); |
38 | } | |
39 | ||
40 | static ssize_t vexpress_hwmon_u32_show(struct device *dev, | |
41 | struct device_attribute *dev_attr, char *buffer) | |
42 | { | |
43 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
44 | int err; | |
45 | u32 value; | |
46 | ||
3b9334ac | 47 | err = regmap_read(data->reg, 0, &value); |
48ed8877 PM |
48 | if (err) |
49 | return err; | |
50 | ||
51 | return snprintf(buffer, PAGE_SIZE, "%u\n", value / | |
52 | to_sensor_dev_attr(dev_attr)->index); | |
53 | } | |
54 | ||
55 | static ssize_t vexpress_hwmon_u64_show(struct device *dev, | |
56 | struct device_attribute *dev_attr, char *buffer) | |
57 | { | |
58 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
59 | int err; | |
60 | u32 value_hi, value_lo; | |
61 | ||
3b9334ac | 62 | err = regmap_read(data->reg, 0, &value_lo); |
48ed8877 PM |
63 | if (err) |
64 | return err; | |
65 | ||
3b9334ac | 66 | err = regmap_read(data->reg, 1, &value_hi); |
48ed8877 PM |
67 | if (err) |
68 | return err; | |
69 | ||
70 | return snprintf(buffer, PAGE_SIZE, "%llu\n", | |
71 | div_u64(((u64)value_hi << 32) | value_lo, | |
72 | to_sensor_dev_attr(dev_attr)->index)); | |
73 | } | |
74 | ||
b2e5411e PM |
75 | static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj, |
76 | struct attribute *attr, int index) | |
77 | { | |
78 | struct device *dev = kobj_to_dev(kobj); | |
79 | struct device_attribute *dev_attr = container_of(attr, | |
80 | struct device_attribute, attr); | |
81 | ||
82 | if (dev_attr->show == vexpress_hwmon_label_show && | |
83 | !of_get_property(dev->of_node, "label", NULL)) | |
84 | return 0; | |
85 | ||
86 | return attr->mode; | |
87 | } | |
88 | ||
52feaca5 PM |
89 | struct vexpress_hwmon_type { |
90 | const char *name; | |
91 | const struct attribute_group **attr_groups; | |
92 | }; | |
93 | ||
48ed8877 | 94 | #if !defined(CONFIG_REGULATOR_VEXPRESS) |
fa75f745 GR |
95 | static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL); |
96 | static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000); | |
78cebd08 PM |
97 | static struct attribute *vexpress_hwmon_attrs_volt[] = { |
98 | &dev_attr_in1_label.attr, | |
99 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
100 | NULL | |
101 | }; | |
48ed8877 | 102 | static struct attribute_group vexpress_hwmon_group_volt = { |
b2e5411e | 103 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
104 | .attrs = vexpress_hwmon_attrs_volt, |
105 | }; | |
52feaca5 PM |
106 | static struct vexpress_hwmon_type vexpress_hwmon_volt = { |
107 | .name = "vexpress_volt", | |
108 | .attr_groups = (const struct attribute_group *[]) { | |
109 | &vexpress_hwmon_group_volt, | |
110 | NULL, | |
111 | }, | |
112 | }; | |
48ed8877 PM |
113 | #endif |
114 | ||
fa75f745 GR |
115 | static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL); |
116 | static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000); | |
78cebd08 PM |
117 | static struct attribute *vexpress_hwmon_attrs_amp[] = { |
118 | &dev_attr_curr1_label.attr, | |
119 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
120 | NULL | |
121 | }; | |
48ed8877 | 122 | static struct attribute_group vexpress_hwmon_group_amp = { |
b2e5411e | 123 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
124 | .attrs = vexpress_hwmon_attrs_amp, |
125 | }; | |
52feaca5 PM |
126 | static struct vexpress_hwmon_type vexpress_hwmon_amp = { |
127 | .name = "vexpress_amp", | |
128 | .attr_groups = (const struct attribute_group *[]) { | |
129 | &vexpress_hwmon_group_amp, | |
130 | NULL | |
131 | }, | |
132 | }; | |
48ed8877 | 133 | |
fa75f745 GR |
134 | static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL); |
135 | static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000); | |
78cebd08 PM |
136 | static struct attribute *vexpress_hwmon_attrs_temp[] = { |
137 | &dev_attr_temp1_label.attr, | |
138 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
139 | NULL | |
140 | }; | |
48ed8877 | 141 | static struct attribute_group vexpress_hwmon_group_temp = { |
b2e5411e | 142 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
143 | .attrs = vexpress_hwmon_attrs_temp, |
144 | }; | |
52feaca5 PM |
145 | static struct vexpress_hwmon_type vexpress_hwmon_temp = { |
146 | .name = "vexpress_temp", | |
147 | .attr_groups = (const struct attribute_group *[]) { | |
148 | &vexpress_hwmon_group_temp, | |
149 | NULL | |
150 | }, | |
151 | }; | |
48ed8877 | 152 | |
fa75f745 GR |
153 | static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL); |
154 | static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1); | |
78cebd08 PM |
155 | static struct attribute *vexpress_hwmon_attrs_power[] = { |
156 | &dev_attr_power1_label.attr, | |
157 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
158 | NULL | |
159 | }; | |
48ed8877 | 160 | static struct attribute_group vexpress_hwmon_group_power = { |
b2e5411e | 161 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
162 | .attrs = vexpress_hwmon_attrs_power, |
163 | }; | |
52feaca5 PM |
164 | static struct vexpress_hwmon_type vexpress_hwmon_power = { |
165 | .name = "vexpress_power", | |
166 | .attr_groups = (const struct attribute_group *[]) { | |
167 | &vexpress_hwmon_group_power, | |
168 | NULL | |
169 | }, | |
170 | }; | |
48ed8877 | 171 | |
fa75f745 GR |
172 | static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL); |
173 | static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1); | |
78cebd08 PM |
174 | static struct attribute *vexpress_hwmon_attrs_energy[] = { |
175 | &dev_attr_energy1_label.attr, | |
176 | &sensor_dev_attr_energy1_input.dev_attr.attr, | |
177 | NULL | |
178 | }; | |
48ed8877 | 179 | static struct attribute_group vexpress_hwmon_group_energy = { |
b2e5411e | 180 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
181 | .attrs = vexpress_hwmon_attrs_energy, |
182 | }; | |
52feaca5 PM |
183 | static struct vexpress_hwmon_type vexpress_hwmon_energy = { |
184 | .name = "vexpress_energy", | |
185 | .attr_groups = (const struct attribute_group *[]) { | |
186 | &vexpress_hwmon_group_energy, | |
187 | NULL | |
188 | }, | |
189 | }; | |
48ed8877 | 190 | |
d720acac | 191 | static const struct of_device_id vexpress_hwmon_of_match[] = { |
48ed8877 PM |
192 | #if !defined(CONFIG_REGULATOR_VEXPRESS) |
193 | { | |
194 | .compatible = "arm,vexpress-volt", | |
52feaca5 | 195 | .data = &vexpress_hwmon_volt, |
48ed8877 PM |
196 | }, |
197 | #endif | |
198 | { | |
199 | .compatible = "arm,vexpress-amp", | |
52feaca5 | 200 | .data = &vexpress_hwmon_amp, |
48ed8877 PM |
201 | }, { |
202 | .compatible = "arm,vexpress-temp", | |
52feaca5 | 203 | .data = &vexpress_hwmon_temp, |
48ed8877 PM |
204 | }, { |
205 | .compatible = "arm,vexpress-power", | |
52feaca5 | 206 | .data = &vexpress_hwmon_power, |
48ed8877 PM |
207 | }, { |
208 | .compatible = "arm,vexpress-energy", | |
52feaca5 | 209 | .data = &vexpress_hwmon_energy, |
48ed8877 PM |
210 | }, |
211 | {} | |
212 | }; | |
213 | MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); | |
214 | ||
215 | static int vexpress_hwmon_probe(struct platform_device *pdev) | |
216 | { | |
48ed8877 PM |
217 | const struct of_device_id *match; |
218 | struct vexpress_hwmon_data *data; | |
52feaca5 | 219 | const struct vexpress_hwmon_type *type; |
48ed8877 PM |
220 | |
221 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
222 | if (!data) | |
223 | return -ENOMEM; | |
224 | platform_set_drvdata(pdev, data); | |
225 | ||
226 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
227 | if (!match) | |
228 | return -ENODEV; | |
52feaca5 | 229 | type = match->data; |
48ed8877 | 230 | |
3b9334ac PM |
231 | data->reg = devm_regmap_init_vexpress_config(&pdev->dev); |
232 | if (IS_ERR(data->reg)) | |
233 | return PTR_ERR(data->reg); | |
48ed8877 | 234 | |
78cebd08 PM |
235 | data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, |
236 | type->name, data, type->attr_groups); | |
48ed8877 | 237 | |
78cebd08 | 238 | return PTR_ERR_OR_ZERO(data->hwmon_dev); |
48ed8877 PM |
239 | } |
240 | ||
241 | static struct platform_driver vexpress_hwmon_driver = { | |
242 | .probe = vexpress_hwmon_probe, | |
48ed8877 PM |
243 | .driver = { |
244 | .name = DRVNAME, | |
48ed8877 PM |
245 | .of_match_table = vexpress_hwmon_of_match, |
246 | }, | |
247 | }; | |
248 | ||
249 | module_platform_driver(vexpress_hwmon_driver); | |
250 | ||
251 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
252 | MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); | |
253 | MODULE_LICENSE("GPL"); | |
254 | MODULE_ALIAS("platform:vexpress-hwmon"); |