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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; | |
30 | }; | |
31 | ||
32 | static ssize_t vexpress_hwmon_name_show(struct device *dev, | |
33 | struct device_attribute *dev_attr, char *buffer) | |
34 | { | |
35 | const char *compatible = of_get_property(dev->of_node, "compatible", | |
36 | NULL); | |
37 | ||
38 | return sprintf(buffer, "%s\n", compatible); | |
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 | ||
46 | if (!label) | |
47 | return -ENOENT; | |
48 | ||
49 | return snprintf(buffer, PAGE_SIZE, "%s\n", label); | |
50 | } | |
51 | ||
52 | static ssize_t vexpress_hwmon_u32_show(struct device *dev, | |
53 | struct device_attribute *dev_attr, char *buffer) | |
54 | { | |
55 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
56 | int err; | |
57 | u32 value; | |
58 | ||
59 | err = vexpress_config_read(data->func, 0, &value); | |
60 | if (err) | |
61 | return err; | |
62 | ||
63 | return snprintf(buffer, PAGE_SIZE, "%u\n", value / | |
64 | to_sensor_dev_attr(dev_attr)->index); | |
65 | } | |
66 | ||
67 | static ssize_t vexpress_hwmon_u64_show(struct device *dev, | |
68 | struct device_attribute *dev_attr, char *buffer) | |
69 | { | |
70 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
71 | int err; | |
72 | u32 value_hi, value_lo; | |
73 | ||
74 | err = vexpress_config_read(data->func, 0, &value_lo); | |
75 | if (err) | |
76 | return err; | |
77 | ||
78 | err = vexpress_config_read(data->func, 1, &value_hi); | |
79 | if (err) | |
80 | return err; | |
81 | ||
82 | return snprintf(buffer, PAGE_SIZE, "%llu\n", | |
83 | div_u64(((u64)value_hi << 32) | value_lo, | |
84 | to_sensor_dev_attr(dev_attr)->index)); | |
85 | } | |
86 | ||
87 | static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL); | |
88 | ||
89 | #define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \ | |
90 | struct attribute *vexpress_hwmon_attrs_##_name[] = { \ | |
91 | &dev_attr_name.attr, \ | |
92 | &dev_attr_##_label_attr.attr, \ | |
93 | &sensor_dev_attr_##_input_attr.dev_attr.attr, \ | |
94 | NULL \ | |
95 | } | |
96 | ||
97 | #if !defined(CONFIG_REGULATOR_VEXPRESS) | |
98 | static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
99 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
100 | NULL, 1000); | |
101 | static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input); | |
102 | static struct attribute_group vexpress_hwmon_group_volt = { | |
103 | .attrs = vexpress_hwmon_attrs_volt, | |
104 | }; | |
105 | #endif | |
106 | ||
107 | static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
108 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
109 | NULL, 1000); | |
110 | static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input); | |
111 | static struct attribute_group vexpress_hwmon_group_amp = { | |
112 | .attrs = vexpress_hwmon_attrs_amp, | |
113 | }; | |
114 | ||
115 | static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
116 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
117 | NULL, 1000); | |
118 | static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input); | |
119 | static struct attribute_group vexpress_hwmon_group_temp = { | |
120 | .attrs = vexpress_hwmon_attrs_temp, | |
121 | }; | |
122 | ||
123 | static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
124 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
125 | NULL, 1); | |
126 | static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input); | |
127 | static struct attribute_group vexpress_hwmon_group_power = { | |
128 | .attrs = vexpress_hwmon_attrs_power, | |
129 | }; | |
130 | ||
131 | static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
132 | static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show, | |
133 | NULL, 1); | |
134 | static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input); | |
135 | static struct attribute_group vexpress_hwmon_group_energy = { | |
136 | .attrs = vexpress_hwmon_attrs_energy, | |
137 | }; | |
138 | ||
139 | static struct of_device_id vexpress_hwmon_of_match[] = { | |
140 | #if !defined(CONFIG_REGULATOR_VEXPRESS) | |
141 | { | |
142 | .compatible = "arm,vexpress-volt", | |
143 | .data = &vexpress_hwmon_group_volt, | |
144 | }, | |
145 | #endif | |
146 | { | |
147 | .compatible = "arm,vexpress-amp", | |
148 | .data = &vexpress_hwmon_group_amp, | |
149 | }, { | |
150 | .compatible = "arm,vexpress-temp", | |
151 | .data = &vexpress_hwmon_group_temp, | |
152 | }, { | |
153 | .compatible = "arm,vexpress-power", | |
154 | .data = &vexpress_hwmon_group_power, | |
155 | }, { | |
156 | .compatible = "arm,vexpress-energy", | |
157 | .data = &vexpress_hwmon_group_energy, | |
158 | }, | |
159 | {} | |
160 | }; | |
161 | MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); | |
162 | ||
163 | static int vexpress_hwmon_probe(struct platform_device *pdev) | |
164 | { | |
165 | int err; | |
166 | const struct of_device_id *match; | |
167 | struct vexpress_hwmon_data *data; | |
168 | ||
169 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
170 | if (!data) | |
171 | return -ENOMEM; | |
172 | platform_set_drvdata(pdev, data); | |
173 | ||
174 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
175 | if (!match) | |
176 | return -ENODEV; | |
177 | ||
178 | data->func = vexpress_config_func_get_by_dev(&pdev->dev); | |
179 | if (!data->func) | |
180 | return -ENODEV; | |
181 | ||
182 | err = sysfs_create_group(&pdev->dev.kobj, match->data); | |
183 | if (err) | |
184 | goto error; | |
185 | ||
186 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
187 | if (IS_ERR(data->hwmon_dev)) { | |
188 | err = PTR_ERR(data->hwmon_dev); | |
189 | goto error; | |
190 | } | |
191 | ||
192 | return 0; | |
193 | ||
194 | error: | |
195 | sysfs_remove_group(&pdev->dev.kobj, match->data); | |
196 | vexpress_config_func_put(data->func); | |
197 | return err; | |
198 | } | |
199 | ||
0fe763c5 | 200 | static int vexpress_hwmon_remove(struct platform_device *pdev) |
48ed8877 PM |
201 | { |
202 | struct vexpress_hwmon_data *data = platform_get_drvdata(pdev); | |
203 | const struct of_device_id *match; | |
204 | ||
205 | hwmon_device_unregister(data->hwmon_dev); | |
206 | ||
207 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
208 | sysfs_remove_group(&pdev->dev.kobj, match->data); | |
209 | ||
210 | vexpress_config_func_put(data->func); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static struct platform_driver vexpress_hwmon_driver = { | |
216 | .probe = vexpress_hwmon_probe, | |
0fe763c5 | 217 | .remove = vexpress_hwmon_remove, |
48ed8877 PM |
218 | .driver = { |
219 | .name = DRVNAME, | |
220 | .owner = THIS_MODULE, | |
221 | .of_match_table = vexpress_hwmon_of_match, | |
222 | }, | |
223 | }; | |
224 | ||
225 | module_platform_driver(vexpress_hwmon_driver); | |
226 | ||
227 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
228 | MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); | |
229 | MODULE_LICENSE("GPL"); | |
230 | MODULE_ALIAS("platform:vexpress-hwmon"); |