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1 | /* |
2 | * System Control and Power Interface(SCPI) based hwmon sensor driver | |
3 | * | |
4 | * Copyright (C) 2015 ARM Ltd. | |
5 | * Punit Agrawal <punit.agrawal@arm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
12 | * kind, whether express or implied; without even the implied warranty | |
13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/hwmon.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/scpi_protocol.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/sysfs.h> | |
23 | ||
24 | struct sensor_data { | |
25 | struct scpi_sensor_info info; | |
26 | struct device_attribute dev_attr_input; | |
27 | struct device_attribute dev_attr_label; | |
28 | char input[20]; | |
29 | char label[20]; | |
30 | }; | |
31 | ||
32 | struct scpi_sensors { | |
33 | struct scpi_ops *scpi_ops; | |
34 | struct sensor_data *data; | |
35 | struct attribute **attrs; | |
36 | struct attribute_group group; | |
37 | const struct attribute_group *groups[2]; | |
38 | }; | |
39 | ||
40 | /* hwmon callback functions */ | |
41 | static ssize_t | |
42 | scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf) | |
43 | { | |
44 | struct scpi_sensors *scpi_sensors = dev_get_drvdata(dev); | |
45 | struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops; | |
46 | struct sensor_data *sensor; | |
47 | u32 value; | |
48 | int ret; | |
49 | ||
50 | sensor = container_of(attr, struct sensor_data, dev_attr_input); | |
51 | ||
52 | ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value); | |
53 | if (ret) | |
54 | return ret; | |
55 | ||
56 | return sprintf(buf, "%u\n", value); | |
57 | } | |
58 | ||
59 | static ssize_t | |
60 | scpi_show_label(struct device *dev, struct device_attribute *attr, char *buf) | |
61 | { | |
62 | struct sensor_data *sensor; | |
63 | ||
64 | sensor = container_of(attr, struct sensor_data, dev_attr_label); | |
65 | ||
66 | return sprintf(buf, "%s\n", sensor->info.name); | |
67 | } | |
68 | ||
69 | static int scpi_hwmon_probe(struct platform_device *pdev) | |
70 | { | |
71 | u16 nr_sensors, i; | |
72 | int num_temp = 0, num_volt = 0, num_current = 0, num_power = 0; | |
73 | struct scpi_ops *scpi_ops; | |
74 | struct device *hwdev, *dev = &pdev->dev; | |
75 | struct scpi_sensors *scpi_sensors; | |
76 | int ret; | |
77 | ||
78 | scpi_ops = get_scpi_ops(); | |
79 | if (!scpi_ops) | |
80 | return -EPROBE_DEFER; | |
81 | ||
82 | ret = scpi_ops->sensor_get_capability(&nr_sensors); | |
83 | if (ret) | |
84 | return ret; | |
85 | ||
86 | if (!nr_sensors) | |
87 | return -ENODEV; | |
88 | ||
89 | scpi_sensors = devm_kzalloc(dev, sizeof(*scpi_sensors), GFP_KERNEL); | |
90 | if (!scpi_sensors) | |
91 | return -ENOMEM; | |
92 | ||
93 | scpi_sensors->data = devm_kcalloc(dev, nr_sensors, | |
94 | sizeof(*scpi_sensors->data), GFP_KERNEL); | |
95 | if (!scpi_sensors->data) | |
96 | return -ENOMEM; | |
97 | ||
98 | scpi_sensors->attrs = devm_kcalloc(dev, (nr_sensors * 2) + 1, | |
99 | sizeof(*scpi_sensors->attrs), GFP_KERNEL); | |
100 | if (!scpi_sensors->attrs) | |
101 | return -ENOMEM; | |
102 | ||
103 | scpi_sensors->scpi_ops = scpi_ops; | |
104 | ||
105 | for (i = 0; i < nr_sensors; i++) { | |
106 | struct sensor_data *sensor = &scpi_sensors->data[i]; | |
107 | ||
108 | ret = scpi_ops->sensor_get_info(i, &sensor->info); | |
109 | if (ret) | |
110 | return ret; | |
111 | ||
112 | switch (sensor->info.class) { | |
113 | case TEMPERATURE: | |
114 | snprintf(sensor->input, sizeof(sensor->input), | |
115 | "temp%d_input", num_temp + 1); | |
116 | snprintf(sensor->label, sizeof(sensor->input), | |
117 | "temp%d_label", num_temp + 1); | |
118 | num_temp++; | |
119 | break; | |
120 | case VOLTAGE: | |
121 | snprintf(sensor->input, sizeof(sensor->input), | |
122 | "in%d_input", num_volt); | |
123 | snprintf(sensor->label, sizeof(sensor->input), | |
124 | "in%d_label", num_volt); | |
125 | num_volt++; | |
126 | break; | |
127 | case CURRENT: | |
128 | snprintf(sensor->input, sizeof(sensor->input), | |
129 | "curr%d_input", num_current + 1); | |
130 | snprintf(sensor->label, sizeof(sensor->input), | |
131 | "curr%d_label", num_current + 1); | |
132 | num_current++; | |
133 | break; | |
134 | case POWER: | |
135 | snprintf(sensor->input, sizeof(sensor->input), | |
136 | "power%d_input", num_power + 1); | |
137 | snprintf(sensor->label, sizeof(sensor->input), | |
138 | "power%d_label", num_power + 1); | |
139 | num_power++; | |
140 | break; | |
141 | default: | |
142 | break; | |
143 | } | |
144 | ||
145 | sensor->dev_attr_input.attr.mode = S_IRUGO; | |
146 | sensor->dev_attr_input.show = scpi_show_sensor; | |
147 | sensor->dev_attr_input.attr.name = sensor->input; | |
148 | ||
149 | sensor->dev_attr_label.attr.mode = S_IRUGO; | |
150 | sensor->dev_attr_label.show = scpi_show_label; | |
151 | sensor->dev_attr_label.attr.name = sensor->label; | |
152 | ||
153 | scpi_sensors->attrs[i << 1] = &sensor->dev_attr_input.attr; | |
154 | scpi_sensors->attrs[(i << 1) + 1] = &sensor->dev_attr_label.attr; | |
155 | ||
156 | sysfs_attr_init(scpi_sensors->attrs[i << 1]); | |
157 | sysfs_attr_init(scpi_sensors->attrs[(i << 1) + 1]); | |
158 | } | |
159 | ||
160 | scpi_sensors->group.attrs = scpi_sensors->attrs; | |
161 | scpi_sensors->groups[0] = &scpi_sensors->group; | |
162 | ||
163 | hwdev = devm_hwmon_device_register_with_groups(dev, | |
164 | "scpi_sensors", scpi_sensors, scpi_sensors->groups); | |
165 | ||
166 | return PTR_ERR_OR_ZERO(hwdev); | |
167 | } | |
168 | ||
169 | static const struct of_device_id scpi_of_match[] = { | |
170 | {.compatible = "arm,scpi-sensors"}, | |
171 | {}, | |
172 | }; | |
173 | ||
174 | static struct platform_driver scpi_hwmon_platdrv = { | |
175 | .driver = { | |
176 | .name = "scpi-hwmon", | |
177 | .owner = THIS_MODULE, | |
178 | .of_match_table = scpi_of_match, | |
179 | }, | |
180 | .probe = scpi_hwmon_probe, | |
181 | }; | |
182 | module_platform_driver(scpi_hwmon_platdrv); | |
183 | ||
184 | MODULE_AUTHOR("Punit Agrawal <punit.agrawal@arm.com>"); | |
185 | MODULE_DESCRIPTION("ARM SCPI HWMON interface driver"); | |
186 | MODULE_LICENSE("GPL v2"); |