]>
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> | |
22 | #include <linux/of_device.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/vexpress.h> | |
25 | ||
26 | struct vexpress_hwmon_data { | |
27 | struct device *hwmon_dev; | |
28 | struct vexpress_config_func *func; | |
29 | }; | |
30 | ||
31 | static ssize_t vexpress_hwmon_name_show(struct device *dev, | |
32 | struct device_attribute *dev_attr, char *buffer) | |
33 | { | |
34 | const char *compatible = of_get_property(dev->of_node, "compatible", | |
35 | NULL); | |
36 | ||
37 | return sprintf(buffer, "%s\n", compatible); | |
38 | } | |
39 | ||
40 | static ssize_t vexpress_hwmon_label_show(struct device *dev, | |
41 | struct device_attribute *dev_attr, char *buffer) | |
42 | { | |
43 | const char *label = of_get_property(dev->of_node, "label", NULL); | |
44 | ||
45 | if (!label) | |
46 | return -ENOENT; | |
47 | ||
48 | return snprintf(buffer, PAGE_SIZE, "%s\n", label); | |
49 | } | |
50 | ||
51 | static ssize_t vexpress_hwmon_u32_show(struct device *dev, | |
52 | struct device_attribute *dev_attr, char *buffer) | |
53 | { | |
54 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
55 | int err; | |
56 | u32 value; | |
57 | ||
58 | err = vexpress_config_read(data->func, 0, &value); | |
59 | if (err) | |
60 | return err; | |
61 | ||
62 | return snprintf(buffer, PAGE_SIZE, "%u\n", value / | |
63 | to_sensor_dev_attr(dev_attr)->index); | |
64 | } | |
65 | ||
66 | static ssize_t vexpress_hwmon_u64_show(struct device *dev, | |
67 | struct device_attribute *dev_attr, char *buffer) | |
68 | { | |
69 | struct vexpress_hwmon_data *data = dev_get_drvdata(dev); | |
70 | int err; | |
71 | u32 value_hi, value_lo; | |
72 | ||
73 | err = vexpress_config_read(data->func, 0, &value_lo); | |
74 | if (err) | |
75 | return err; | |
76 | ||
77 | err = vexpress_config_read(data->func, 1, &value_hi); | |
78 | if (err) | |
79 | return err; | |
80 | ||
81 | return snprintf(buffer, PAGE_SIZE, "%llu\n", | |
82 | div_u64(((u64)value_hi << 32) | value_lo, | |
83 | to_sensor_dev_attr(dev_attr)->index)); | |
84 | } | |
85 | ||
86 | static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL); | |
87 | ||
88 | #define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \ | |
89 | struct attribute *vexpress_hwmon_attrs_##_name[] = { \ | |
90 | &dev_attr_name.attr, \ | |
91 | &dev_attr_##_label_attr.attr, \ | |
92 | &sensor_dev_attr_##_input_attr.dev_attr.attr, \ | |
93 | NULL \ | |
94 | } | |
95 | ||
96 | #if !defined(CONFIG_REGULATOR_VEXPRESS) | |
97 | static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
98 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
99 | NULL, 1000); | |
100 | static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input); | |
101 | static struct attribute_group vexpress_hwmon_group_volt = { | |
102 | .attrs = vexpress_hwmon_attrs_volt, | |
103 | }; | |
104 | #endif | |
105 | ||
106 | static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
107 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
108 | NULL, 1000); | |
109 | static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input); | |
110 | static struct attribute_group vexpress_hwmon_group_amp = { | |
111 | .attrs = vexpress_hwmon_attrs_amp, | |
112 | }; | |
113 | ||
114 | static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
115 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
116 | NULL, 1000); | |
117 | static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input); | |
118 | static struct attribute_group vexpress_hwmon_group_temp = { | |
119 | .attrs = vexpress_hwmon_attrs_temp, | |
120 | }; | |
121 | ||
122 | static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
123 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show, | |
124 | NULL, 1); | |
125 | static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input); | |
126 | static struct attribute_group vexpress_hwmon_group_power = { | |
127 | .attrs = vexpress_hwmon_attrs_power, | |
128 | }; | |
129 | ||
130 | static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); | |
131 | static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show, | |
132 | NULL, 1); | |
133 | static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input); | |
134 | static struct attribute_group vexpress_hwmon_group_energy = { | |
135 | .attrs = vexpress_hwmon_attrs_energy, | |
136 | }; | |
137 | ||
138 | static struct of_device_id vexpress_hwmon_of_match[] = { | |
139 | #if !defined(CONFIG_REGULATOR_VEXPRESS) | |
140 | { | |
141 | .compatible = "arm,vexpress-volt", | |
142 | .data = &vexpress_hwmon_group_volt, | |
143 | }, | |
144 | #endif | |
145 | { | |
146 | .compatible = "arm,vexpress-amp", | |
147 | .data = &vexpress_hwmon_group_amp, | |
148 | }, { | |
149 | .compatible = "arm,vexpress-temp", | |
150 | .data = &vexpress_hwmon_group_temp, | |
151 | }, { | |
152 | .compatible = "arm,vexpress-power", | |
153 | .data = &vexpress_hwmon_group_power, | |
154 | }, { | |
155 | .compatible = "arm,vexpress-energy", | |
156 | .data = &vexpress_hwmon_group_energy, | |
157 | }, | |
158 | {} | |
159 | }; | |
160 | MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); | |
161 | ||
162 | static int vexpress_hwmon_probe(struct platform_device *pdev) | |
163 | { | |
164 | int err; | |
165 | const struct of_device_id *match; | |
166 | struct vexpress_hwmon_data *data; | |
167 | ||
168 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
169 | if (!data) | |
170 | return -ENOMEM; | |
171 | platform_set_drvdata(pdev, data); | |
172 | ||
173 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
174 | if (!match) | |
175 | return -ENODEV; | |
176 | ||
177 | data->func = vexpress_config_func_get_by_dev(&pdev->dev); | |
178 | if (!data->func) | |
179 | return -ENODEV; | |
180 | ||
181 | err = sysfs_create_group(&pdev->dev.kobj, match->data); | |
182 | if (err) | |
183 | goto error; | |
184 | ||
185 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
186 | if (IS_ERR(data->hwmon_dev)) { | |
187 | err = PTR_ERR(data->hwmon_dev); | |
188 | goto error; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | ||
193 | error: | |
194 | sysfs_remove_group(&pdev->dev.kobj, match->data); | |
195 | vexpress_config_func_put(data->func); | |
196 | return err; | |
197 | } | |
198 | ||
199 | static int __devexit vexpress_hwmon_remove(struct platform_device *pdev) | |
200 | { | |
201 | struct vexpress_hwmon_data *data = platform_get_drvdata(pdev); | |
202 | const struct of_device_id *match; | |
203 | ||
204 | hwmon_device_unregister(data->hwmon_dev); | |
205 | ||
206 | match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); | |
207 | sysfs_remove_group(&pdev->dev.kobj, match->data); | |
208 | ||
209 | vexpress_config_func_put(data->func); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static struct platform_driver vexpress_hwmon_driver = { | |
215 | .probe = vexpress_hwmon_probe, | |
216 | .remove = __devexit_p(vexpress_hwmon_remove), | |
217 | .driver = { | |
218 | .name = DRVNAME, | |
219 | .owner = THIS_MODULE, | |
220 | .of_match_table = vexpress_hwmon_of_match, | |
221 | }, | |
222 | }; | |
223 | ||
224 | module_platform_driver(vexpress_hwmon_driver); | |
225 | ||
226 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
227 | MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); | |
228 | MODULE_LICENSE("GPL"); | |
229 | MODULE_ALIAS("platform:vexpress-hwmon"); |