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; | |
29 | struct vexpress_config_func *func; | |
52feaca5 | 30 | const char *name; |
48ed8877 PM |
31 | }; |
32 | ||
33 | static ssize_t vexpress_hwmon_name_show(struct device *dev, | |
34 | struct device_attribute *dev_attr, char *buffer) | |
35 | { | |
52feaca5 | 36 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); |
48ed8877 | 37 | |
52feaca5 | 38 | return sprintf(buffer, "%s\n", data->name); |
48ed8877 PM |
39 | } |
40 | ||
41 | static ssize_t vexpress_hwmon_label_show(struct device *dev, | |
42 | struct device_attribute *dev_attr, char *buffer) | |
43 | { | |
44 | const char *label = of_get_property(dev->of_node, "label", NULL); | |
45 | ||
48ed8877 PM |
46 | return snprintf(buffer, PAGE_SIZE, "%s\n", label); |
47 | } | |
48 | ||
49 | static ssize_t vexpress_hwmon_u32_show(struct device *dev, | |
50 | struct device_attribute *dev_attr, char *buffer) | |
51 | { | |
52 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
53 | int err; | |
54 | u32 value; | |
55 | ||
56 | err = vexpress_config_read(data->func, 0, &value); | |
57 | if (err) | |
58 | return err; | |
59 | ||
60 | return snprintf(buffer, PAGE_SIZE, "%u\n", value / | |
61 | to_sensor_dev_attr(dev_attr)->index); | |
62 | } | |
63 | ||
64 | static ssize_t vexpress_hwmon_u64_show(struct device *dev, | |
65 | struct device_attribute *dev_attr, char *buffer) | |
66 | { | |
67 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
68 | int err; | |
69 | u32 value_hi, value_lo; | |
70 | ||
71 | err = vexpress_config_read(data->func, 0, &value_lo); | |
72 | if (err) | |
73 | return err; | |
74 | ||
75 | err = vexpress_config_read(data->func, 1, &value_hi); | |
76 | if (err) | |
77 | return err; | |
78 | ||
79 | return snprintf(buffer, PAGE_SIZE, "%llu\n", | |
80 | div_u64(((u64)value_hi << 32) | value_lo, | |
81 | to_sensor_dev_attr(dev_attr)->index)); | |
82 | } | |
83 | ||
b2e5411e PM |
84 | static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj, |
85 | struct attribute *attr, int index) | |
86 | { | |
87 | struct device *dev = kobj_to_dev(kobj); | |
88 | struct device_attribute *dev_attr = container_of(attr, | |
89 | struct device_attribute, attr); | |
90 | ||
91 | if (dev_attr->show == vexpress_hwmon_label_show && | |
92 | !of_get_property(dev->of_node, "label", NULL)) | |
93 | return 0; | |
94 | ||
95 | return attr->mode; | |
96 | } | |
97 | ||
48ed8877 PM |
98 | static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL); |
99 | ||
100 | #define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \ | |
101 | struct attribute *vexpress_hwmon_attrs_##_name[] = { \ | |
102 | &dev_attr_name.attr, \ | |
103 | &dev_attr_##_label_attr.attr, \ | |
104 | &sensor_dev_attr_##_input_attr.dev_attr.attr, \ | |
105 | NULL \ | |
106 | } | |
107 | ||
52feaca5 PM |
108 | struct vexpress_hwmon_type { |
109 | const char *name; | |
110 | const struct attribute_group **attr_groups; | |
111 | }; | |
112 | ||
48ed8877 PM |
113 | #if !defined(CONFIG_REGULATOR_VEXPRESS) |
114 | static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
115 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
116 | NULL, 1000); | |
117 | static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input); | |
118 | static struct attribute_group vexpress_hwmon_group_volt = { | |
b2e5411e | 119 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
120 | .attrs = vexpress_hwmon_attrs_volt, |
121 | }; | |
52feaca5 PM |
122 | static struct vexpress_hwmon_type vexpress_hwmon_volt = { |
123 | .name = "vexpress_volt", | |
124 | .attr_groups = (const struct attribute_group *[]) { | |
125 | &vexpress_hwmon_group_volt, | |
126 | NULL, | |
127 | }, | |
128 | }; | |
48ed8877 PM |
129 | #endif |
130 | ||
131 | static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
132 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
133 | NULL, 1000); | |
134 | static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input); | |
135 | static struct attribute_group vexpress_hwmon_group_amp = { | |
b2e5411e | 136 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
137 | .attrs = vexpress_hwmon_attrs_amp, |
138 | }; | |
52feaca5 PM |
139 | static struct vexpress_hwmon_type vexpress_hwmon_amp = { |
140 | .name = "vexpress_amp", | |
141 | .attr_groups = (const struct attribute_group *[]) { | |
142 | &vexpress_hwmon_group_amp, | |
143 | NULL | |
144 | }, | |
145 | }; | |
48ed8877 PM |
146 | |
147 | static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
148 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
149 | NULL, 1000); | |
150 | static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input); | |
151 | static struct attribute_group vexpress_hwmon_group_temp = { | |
b2e5411e | 152 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
153 | .attrs = vexpress_hwmon_attrs_temp, |
154 | }; | |
52feaca5 PM |
155 | static struct vexpress_hwmon_type vexpress_hwmon_temp = { |
156 | .name = "vexpress_temp", | |
157 | .attr_groups = (const struct attribute_group *[]) { | |
158 | &vexpress_hwmon_group_temp, | |
159 | NULL | |
160 | }, | |
161 | }; | |
48ed8877 PM |
162 | |
163 | static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
164 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
165 | NULL, 1); | |
166 | static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input); | |
167 | static struct attribute_group vexpress_hwmon_group_power = { | |
b2e5411e | 168 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
169 | .attrs = vexpress_hwmon_attrs_power, |
170 | }; | |
52feaca5 PM |
171 | static struct vexpress_hwmon_type vexpress_hwmon_power = { |
172 | .name = "vexpress_power", | |
173 | .attr_groups = (const struct attribute_group *[]) { | |
174 | &vexpress_hwmon_group_power, | |
175 | NULL | |
176 | }, | |
177 | }; | |
48ed8877 PM |
178 | |
179 | static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
180 | static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show, | |
181 | NULL, 1); | |
182 | static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input); | |
183 | static struct attribute_group vexpress_hwmon_group_energy = { | |
b2e5411e | 184 | .is_visible = vexpress_hwmon_attr_is_visible, |
48ed8877 PM |
185 | .attrs = vexpress_hwmon_attrs_energy, |
186 | }; | |
52feaca5 PM |
187 | static struct vexpress_hwmon_type vexpress_hwmon_energy = { |
188 | .name = "vexpress_energy", | |
189 | .attr_groups = (const struct attribute_group *[]) { | |
190 | &vexpress_hwmon_group_energy, | |
191 | NULL | |
192 | }, | |
193 | }; | |
48ed8877 PM |
194 | |
195 | static struct of_device_id vexpress_hwmon_of_match[] = { | |
196 | #if !defined(CONFIG_REGULATOR_VEXPRESS) | |
197 | { | |
198 | .compatible = "arm,vexpress-volt", | |
52feaca5 | 199 | .data = &vexpress_hwmon_volt, |
48ed8877 PM |
200 | }, |
201 | #endif | |
202 | { | |
203 | .compatible = "arm,vexpress-amp", | |
52feaca5 | 204 | .data = &vexpress_hwmon_amp, |
48ed8877 PM |
205 | }, { |
206 | .compatible = "arm,vexpress-temp", | |
52feaca5 | 207 | .data = &vexpress_hwmon_temp, |
48ed8877 PM |
208 | }, { |
209 | .compatible = "arm,vexpress-power", | |
52feaca5 | 210 | .data = &vexpress_hwmon_power, |
48ed8877 PM |
211 | }, { |
212 | .compatible = "arm,vexpress-energy", | |
52feaca5 | 213 | .data = &vexpress_hwmon_energy, |
48ed8877 PM |
214 | }, |
215 | {} | |
216 | }; | |
217 | MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); | |
218 | ||
219 | static int vexpress_hwmon_probe(struct platform_device *pdev) | |
220 | { | |
221 | int err; | |
222 | const struct of_device_id *match; | |
223 | struct vexpress_hwmon_data *data; | |
52feaca5 | 224 | const struct vexpress_hwmon_type *type; |
48ed8877 PM |
225 | |
226 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
227 | if (!data) | |
228 | return -ENOMEM; | |
229 | platform_set_drvdata(pdev, data); | |
230 | ||
231 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
232 | if (!match) | |
233 | return -ENODEV; | |
52feaca5 PM |
234 | type = match->data; |
235 | data->name = type->name; | |
48ed8877 PM |
236 | |
237 | data->func = vexpress_config_func_get_by_dev(&pdev->dev); | |
238 | if (!data->func) | |
239 | return -ENODEV; | |
240 | ||
52feaca5 | 241 | err = sysfs_create_groups(&pdev->dev.kobj, type->attr_groups); |
48ed8877 PM |
242 | if (err) |
243 | goto error; | |
244 | ||
245 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
246 | if (IS_ERR(data->hwmon_dev)) { | |
247 | err = PTR_ERR(data->hwmon_dev); | |
248 | goto error; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | ||
253 | error: | |
254 | sysfs_remove_group(&pdev->dev.kobj, match->data); | |
255 | vexpress_config_func_put(data->func); | |
256 | return err; | |
257 | } | |
258 | ||
0fe763c5 | 259 | static int vexpress_hwmon_remove(struct platform_device *pdev) |
48ed8877 PM |
260 | { |
261 | struct vexpress_hwmon_data *data = platform_get_drvdata(pdev); | |
262 | const struct of_device_id *match; | |
263 | ||
264 | hwmon_device_unregister(data->hwmon_dev); | |
265 | ||
266 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
267 | sysfs_remove_group(&pdev->dev.kobj, match->data); | |
268 | ||
269 | vexpress_config_func_put(data->func); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static struct platform_driver vexpress_hwmon_driver = { | |
275 | .probe = vexpress_hwmon_probe, | |
0fe763c5 | 276 | .remove = vexpress_hwmon_remove, |
48ed8877 PM |
277 | .driver = { |
278 | .name = DRVNAME, | |
279 | .owner = THIS_MODULE, | |
280 | .of_match_table = vexpress_hwmon_of_match, | |
281 | }, | |
282 | }; | |
283 | ||
284 | module_platform_driver(vexpress_hwmon_driver); | |
285 | ||
286 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
287 | MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); | |
288 | MODULE_LICENSE("GPL"); | |
289 | MODULE_ALIAS("platform:vexpress-hwmon"); |