thermal: qcom: tsens: Allow number of sensors to come from DT
[muen/linux.git] / drivers / thermal / qcom / tsens.c
1 /*
2  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 and
6  * only version 2 as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  */
14
15 #include <linux/err.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm.h>
20 #include <linux/slab.h>
21 #include <linux/thermal.h>
22 #include "tsens.h"
23
24 static int tsens_get_temp(void *data, int *temp)
25 {
26         const struct tsens_sensor *s = data;
27         struct tsens_device *tmdev = s->tmdev;
28
29         return tmdev->ops->get_temp(tmdev, s->id, temp);
30 }
31
32 static int tsens_get_trend(void *p, int trip, enum thermal_trend *trend)
33 {
34         const struct tsens_sensor *s = p;
35         struct tsens_device *tmdev = s->tmdev;
36
37         if (tmdev->ops->get_trend)
38                 return  tmdev->ops->get_trend(tmdev, s->id, trend);
39
40         return -ENOTSUPP;
41 }
42
43 static int  __maybe_unused tsens_suspend(struct device *dev)
44 {
45         struct tsens_device *tmdev = dev_get_drvdata(dev);
46
47         if (tmdev->ops && tmdev->ops->suspend)
48                 return tmdev->ops->suspend(tmdev);
49
50         return 0;
51 }
52
53 static int __maybe_unused tsens_resume(struct device *dev)
54 {
55         struct tsens_device *tmdev = dev_get_drvdata(dev);
56
57         if (tmdev->ops && tmdev->ops->resume)
58                 return tmdev->ops->resume(tmdev);
59
60         return 0;
61 }
62
63 static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume);
64
65 static const struct of_device_id tsens_table[] = {
66         {
67                 .compatible = "qcom,msm8916-tsens",
68                 .data = &data_8916,
69         }, {
70                 .compatible = "qcom,msm8974-tsens",
71                 .data = &data_8974,
72         }, {
73                 .compatible = "qcom,msm8996-tsens",
74                 .data = &data_8996,
75         },
76         {}
77 };
78 MODULE_DEVICE_TABLE(of, tsens_table);
79
80 static const struct thermal_zone_of_device_ops tsens_of_ops = {
81         .get_temp = tsens_get_temp,
82         .get_trend = tsens_get_trend,
83 };
84
85 static int tsens_register(struct tsens_device *tmdev)
86 {
87         int i;
88         struct thermal_zone_device *tzd;
89         u32 *hw_id, n = tmdev->num_sensors;
90
91         hw_id = devm_kcalloc(tmdev->dev, n, sizeof(u32), GFP_KERNEL);
92         if (!hw_id)
93                 return -ENOMEM;
94
95         for (i = 0;  i < tmdev->num_sensors; i++) {
96                 tmdev->sensor[i].tmdev = tmdev;
97                 tmdev->sensor[i].id = i;
98                 tzd = devm_thermal_zone_of_sensor_register(tmdev->dev, i,
99                                                            &tmdev->sensor[i],
100                                                            &tsens_of_ops);
101                 if (IS_ERR(tzd))
102                         continue;
103                 tmdev->sensor[i].tzd = tzd;
104                 if (tmdev->ops->enable)
105                         tmdev->ops->enable(tmdev, i);
106         }
107         return 0;
108 }
109
110 static int tsens_probe(struct platform_device *pdev)
111 {
112         int ret, i;
113         struct device *dev;
114         struct device_node *np;
115         struct tsens_sensor *s;
116         struct tsens_device *tmdev;
117         const struct tsens_data *data;
118         const struct of_device_id *id;
119         u32 num_sensors;
120
121         if (pdev->dev.of_node)
122                 dev = &pdev->dev;
123         else
124                 dev = pdev->dev.parent;
125
126         np = dev->of_node;
127
128         id = of_match_node(tsens_table, np);
129         if (id)
130                 data = id->data;
131         else
132                 data = &data_8960;
133
134         num_sensors = data->num_sensors;
135
136         if (np)
137                 of_property_read_u32(np, "#qcom,sensors", &num_sensors);
138
139         if (num_sensors <= 0) {
140                 dev_err(dev, "invalid number of sensors\n");
141                 return -EINVAL;
142         }
143
144         tmdev = devm_kzalloc(dev, sizeof(*tmdev) +
145                              num_sensors * sizeof(*s), GFP_KERNEL);
146         if (!tmdev)
147                 return -ENOMEM;
148
149         tmdev->dev = dev;
150         tmdev->num_sensors = num_sensors;
151         tmdev->ops = data->ops;
152         for (i = 0;  i < tmdev->num_sensors; i++) {
153                 if (data->hw_ids)
154                         tmdev->sensor[i].hw_id = data->hw_ids[i];
155                 else
156                         tmdev->sensor[i].hw_id = i;
157         }
158
159         if (!tmdev->ops || !tmdev->ops->init || !tmdev->ops->get_temp)
160                 return -EINVAL;
161
162         ret = tmdev->ops->init(tmdev);
163         if (ret < 0) {
164                 dev_err(dev, "tsens init failed\n");
165                 return ret;
166         }
167
168         if (tmdev->ops->calibrate) {
169                 ret = tmdev->ops->calibrate(tmdev);
170                 if (ret < 0) {
171                         dev_err(dev, "tsens calibration failed\n");
172                         return ret;
173                 }
174         }
175
176         ret = tsens_register(tmdev);
177
178         platform_set_drvdata(pdev, tmdev);
179
180         return ret;
181 }
182
183 static int tsens_remove(struct platform_device *pdev)
184 {
185         struct tsens_device *tmdev = platform_get_drvdata(pdev);
186
187         if (tmdev->ops->disable)
188                 tmdev->ops->disable(tmdev);
189
190         return 0;
191 }
192
193 static struct platform_driver tsens_driver = {
194         .probe = tsens_probe,
195         .remove = tsens_remove,
196         .driver = {
197                 .name = "qcom-tsens",
198                 .pm     = &tsens_pm_ops,
199                 .of_match_table = tsens_table,
200         },
201 };
202 module_platform_driver(tsens_driver);
203
204 MODULE_LICENSE("GPL v2");
205 MODULE_DESCRIPTION("QCOM Temperature Sensor driver");
206 MODULE_ALIAS("platform:qcom-tsens");