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Diffstat (limited to 'drivers/hwmon/wm831x-hwmon.c')
-rw-r--r--drivers/hwmon/wm831x-hwmon.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/hwmon/wm831x-hwmon.c b/drivers/hwmon/wm831x-hwmon.c
new file mode 100644
index 00000000000..c16e9e74c35
--- /dev/null
+++ b/drivers/hwmon/wm831x-hwmon.c
@@ -0,0 +1,226 @@
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
28#include <linux/mfd/wm831x/core.h>
29#include <linux/mfd/wm831x/auxadc.h>
30
31struct wm831x_hwmon {
32 struct wm831x *wm831x;
33 struct device *classdev;
34};
35
36static ssize_t show_name(struct device *dev,
37 struct device_attribute *attr, char *buf)
38{
39 return sprintf(buf, "wm831x\n");
40}
41
42static const char *input_names[] = {
43 [WM831X_AUX_SYSVDD] = "SYSVDD",
44 [WM831X_AUX_USB] = "USB",
45 [WM831X_AUX_BKUP_BATT] = "Backup battery",
46 [WM831X_AUX_BATT] = "Battery",
47 [WM831X_AUX_WALL] = "WALL",
48 [WM831X_AUX_CHIP_TEMP] = "PMIC",
49 [WM831X_AUX_BATT_TEMP] = "Battery",
50};
51
52
53static ssize_t show_voltage(struct device *dev,
54 struct device_attribute *attr, char *buf)
55{
56 struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
57 int channel = to_sensor_dev_attr(attr)->index;
58 int ret;
59
60 ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel);
61 if (ret < 0)
62 return ret;
63
64 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
65}
66
67static ssize_t show_chip_temp(struct device *dev,
68 struct device_attribute *attr, char *buf)
69{
70 struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
71 int channel = to_sensor_dev_attr(attr)->index;
72 int ret;
73
74 ret = wm831x_auxadc_read(hwmon->wm831x, channel);
75 if (ret < 0)
76 return ret;
77
78 /* Degrees celsius = (512.18-ret) / 1.0983 */
79 ret = 512180 - (ret * 1000);
80 ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
81
82 return sprintf(buf, "%d\n", ret);
83}
84
85static ssize_t show_label(struct device *dev,
86 struct device_attribute *attr, char *buf)
87{
88 int channel = to_sensor_dev_attr(attr)->index;
89
90 return sprintf(buf, "%s\n", input_names[channel]);
91}
92
93#define WM831X_VOLTAGE(id, name) \
94 static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
95 NULL, name)
96
97#define WM831X_NAMED_VOLTAGE(id, name) \
98 WM831X_VOLTAGE(id, name); \
99 static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
100 NULL, name)
101
102static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
103
104WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
105WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
106WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
107WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
108
109WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
110WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
111WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
112WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
113WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
114
115static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
116 WM831X_AUX_CHIP_TEMP);
117static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
118 WM831X_AUX_CHIP_TEMP);
119/* Report as a voltage since conversion depends on external components
120 * and that's what the ABI wants. */
121static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
122 WM831X_AUX_BATT_TEMP);
123static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
124 WM831X_AUX_BATT_TEMP);
125
126static struct attribute *wm831x_attributes[] = {
127 &dev_attr_name.attr,
128
129 &sensor_dev_attr_in0_input.dev_attr.attr,
130 &sensor_dev_attr_in1_input.dev_attr.attr,
131 &sensor_dev_attr_in2_input.dev_attr.attr,
132 &sensor_dev_attr_in3_input.dev_attr.attr,
133
134 &sensor_dev_attr_in4_input.dev_attr.attr,
135 &sensor_dev_attr_in4_label.dev_attr.attr,
136 &sensor_dev_attr_in5_input.dev_attr.attr,
137 &sensor_dev_attr_in5_label.dev_attr.attr,
138 &sensor_dev_attr_in6_input.dev_attr.attr,
139 &sensor_dev_attr_in6_label.dev_attr.attr,
140 &sensor_dev_attr_in7_input.dev_attr.attr,
141 &sensor_dev_attr_in7_label.dev_attr.attr,
142 &sensor_dev_attr_in8_input.dev_attr.attr,
143 &sensor_dev_attr_in8_label.dev_attr.attr,
144
145 &sensor_dev_attr_temp1_input.dev_attr.attr,
146 &sensor_dev_attr_temp1_label.dev_attr.attr,
147 &sensor_dev_attr_temp2_input.dev_attr.attr,
148 &sensor_dev_attr_temp2_label.dev_attr.attr,
149
150 NULL
151};
152
153static const struct attribute_group wm831x_attr_group = {
154 .attrs = wm831x_attributes,
155};
156
157static int __devinit wm831x_hwmon_probe(struct platform_device *pdev)
158{
159 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
160 struct wm831x_hwmon *hwmon;
161 int ret;
162
163 hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL);
164 if (!hwmon)
165 return -ENOMEM;
166
167 hwmon->wm831x = wm831x;
168
169 ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group);
170 if (ret)
171 goto err;
172
173 hwmon->classdev = hwmon_device_register(&pdev->dev);
174 if (IS_ERR(hwmon->classdev)) {
175 ret = PTR_ERR(hwmon->classdev);
176 goto err_sysfs;
177 }
178
179 platform_set_drvdata(pdev, hwmon);
180
181 return 0;
182
183err_sysfs:
184 sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
185err:
186 kfree(hwmon);
187 return ret;
188}
189
190static int __devexit wm831x_hwmon_remove(struct platform_device *pdev)
191{
192 struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev);
193
194 hwmon_device_unregister(hwmon->classdev);
195 sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
196 platform_set_drvdata(pdev, NULL);
197 kfree(hwmon);
198
199 return 0;
200}
201
202static struct platform_driver wm831x_hwmon_driver = {
203 .probe = wm831x_hwmon_probe,
204 .remove = __devexit_p(wm831x_hwmon_remove),
205 .driver = {
206 .name = "wm831x-hwmon",
207 .owner = THIS_MODULE,
208 },
209};
210
211static int __init wm831x_hwmon_init(void)
212{
213 return platform_driver_register(&wm831x_hwmon_driver);
214}
215module_init(wm831x_hwmon_init);
216
217static void __exit wm831x_hwmon_exit(void)
218{
219 platform_driver_unregister(&wm831x_hwmon_driver);
220}
221module_exit(wm831x_hwmon_exit);
222
223MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
224MODULE_DESCRIPTION("WM831x Hardware Monitoring");
225MODULE_LICENSE("GPL");
226MODULE_ALIAS("platform:wm831x-hwmon");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 06:44:13 -0500