hwmon: (coretemp) Drop duplicate function get_pkg_tjmax
[linux-2.6.git] / drivers / hwmon / wm831x-hwmon.c
1 /*
2  * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
3  *                                hardware monitoring features.
4  *
5  * Copyright (C) 2009 Wolfson Microelectronics plc
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License v2 as published by the
9  * Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/platform_device.h>
24 #include <linux/err.h>
25 #include <linux/hwmon.h>
26 #include <linux/hwmon-sysfs.h>
27 #include <linux/slab.h>
28
29 #include <linux/mfd/wm831x/core.h>
30 #include <linux/mfd/wm831x/auxadc.h>
31
32 struct wm831x_hwmon {
33         struct wm831x *wm831x;
34         struct device *classdev;
35 };
36
37 static ssize_t show_name(struct device *dev,
38                          struct device_attribute *attr, char *buf)
39 {
40         return sprintf(buf, "wm831x\n");
41 }
42
43 static const char *input_names[] = {
44         [WM831X_AUX_SYSVDD]    = "SYSVDD",
45         [WM831X_AUX_USB]       = "USB",
46         [WM831X_AUX_BKUP_BATT] = "Backup battery",
47         [WM831X_AUX_BATT]      = "Battery",
48         [WM831X_AUX_WALL]      = "WALL",
49         [WM831X_AUX_CHIP_TEMP] = "PMIC",
50         [WM831X_AUX_BATT_TEMP] = "Battery",
51 };
52
53
54 static ssize_t show_voltage(struct device *dev,
55                             struct device_attribute *attr, char *buf)
56 {
57         struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
58         int channel = to_sensor_dev_attr(attr)->index;
59         int ret;
60
61         ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel);
62         if (ret < 0)
63                 return ret;
64
65         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
66 }
67
68 static ssize_t show_chip_temp(struct device *dev,
69                               struct device_attribute *attr, char *buf)
70 {
71         struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
72         int channel = to_sensor_dev_attr(attr)->index;
73         int ret;
74
75         ret = wm831x_auxadc_read(hwmon->wm831x, channel);
76         if (ret < 0)
77                 return ret;
78
79         /* Degrees celsius = (512.18-ret) / 1.0983 */
80         ret = 512180 - (ret * 1000);
81         ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
82
83         return sprintf(buf, "%d\n", ret);
84 }
85
86 static ssize_t show_label(struct device *dev,
87                           struct device_attribute *attr, char *buf)
88 {
89         int channel = to_sensor_dev_attr(attr)->index;
90
91         return sprintf(buf, "%s\n", input_names[channel]);
92 }
93
94 #define WM831X_VOLTAGE(id, name) \
95         static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
96                                   NULL, name)
97
98 #define WM831X_NAMED_VOLTAGE(id, name) \
99         WM831X_VOLTAGE(id, name); \
100         static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,  \
101                                   NULL, name)
102
103 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
104
105 WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
106 WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
107 WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
108 WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
109
110 WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
111 WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
112 WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
113 WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
114 WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
115
116 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
117                           WM831X_AUX_CHIP_TEMP);
118 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
119                           WM831X_AUX_CHIP_TEMP);
120 /* Report as a voltage since conversion depends on external components
121  * and that's what the ABI wants. */
122 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
123                           WM831X_AUX_BATT_TEMP);
124 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
125                           WM831X_AUX_BATT_TEMP);
126
127 static struct attribute *wm831x_attributes[] = {
128         &dev_attr_name.attr,
129
130         &sensor_dev_attr_in0_input.dev_attr.attr,
131         &sensor_dev_attr_in1_input.dev_attr.attr,
132         &sensor_dev_attr_in2_input.dev_attr.attr,
133         &sensor_dev_attr_in3_input.dev_attr.attr,
134
135         &sensor_dev_attr_in4_input.dev_attr.attr,
136         &sensor_dev_attr_in4_label.dev_attr.attr,
137         &sensor_dev_attr_in5_input.dev_attr.attr,
138         &sensor_dev_attr_in5_label.dev_attr.attr,
139         &sensor_dev_attr_in6_input.dev_attr.attr,
140         &sensor_dev_attr_in6_label.dev_attr.attr,
141         &sensor_dev_attr_in7_input.dev_attr.attr,
142         &sensor_dev_attr_in7_label.dev_attr.attr,
143         &sensor_dev_attr_in8_input.dev_attr.attr,
144         &sensor_dev_attr_in8_label.dev_attr.attr,
145
146         &sensor_dev_attr_temp1_input.dev_attr.attr,
147         &sensor_dev_attr_temp1_label.dev_attr.attr,
148         &sensor_dev_attr_temp2_input.dev_attr.attr,
149         &sensor_dev_attr_temp2_label.dev_attr.attr,
150
151         NULL
152 };
153
154 static const struct attribute_group wm831x_attr_group = {
155         .attrs  = wm831x_attributes,
156 };
157
158 static int __devinit wm831x_hwmon_probe(struct platform_device *pdev)
159 {
160         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
161         struct wm831x_hwmon *hwmon;
162         int ret;
163
164         hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL);
165         if (!hwmon)
166                 return -ENOMEM;
167
168         hwmon->wm831x = wm831x;
169
170         ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group);
171         if (ret)
172                 goto err;
173
174         hwmon->classdev = hwmon_device_register(&pdev->dev);
175         if (IS_ERR(hwmon->classdev)) {
176                 ret = PTR_ERR(hwmon->classdev);
177                 goto err_sysfs;
178         }
179
180         platform_set_drvdata(pdev, hwmon);
181
182         return 0;
183
184 err_sysfs:
185         sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
186 err:
187         kfree(hwmon);
188         return ret;
189 }
190
191 static int __devexit wm831x_hwmon_remove(struct platform_device *pdev)
192 {
193         struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev);
194
195         hwmon_device_unregister(hwmon->classdev);
196         sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
197         platform_set_drvdata(pdev, NULL);
198         kfree(hwmon);
199
200         return 0;
201 }
202
203 static struct platform_driver wm831x_hwmon_driver = {
204         .probe = wm831x_hwmon_probe,
205         .remove = __devexit_p(wm831x_hwmon_remove),
206         .driver = {
207                 .name = "wm831x-hwmon",
208                 .owner = THIS_MODULE,
209         },
210 };
211
212 static int __init wm831x_hwmon_init(void)
213 {
214         return platform_driver_register(&wm831x_hwmon_driver);
215 }
216 module_init(wm831x_hwmon_init);
217
218 static void __exit wm831x_hwmon_exit(void)
219 {
220         platform_driver_unregister(&wm831x_hwmon_driver);
221 }
222 module_exit(wm831x_hwmon_exit);
223
224 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
225 MODULE_DESCRIPTION("WM831x Hardware Monitoring");
226 MODULE_LICENSE("GPL");
227 MODULE_ALIAS("platform:wm831x-hwmon");