Commit | Line | Data |
---|---|---|
08bad5a8 MB |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
08bad5a8 MB |
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 | ||
a6100f6b | 43 | static const char * const input_names[] = { |
08bad5a8 MB |
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); | |
07de3dfb GR |
120 | /* |
121 | * Report as a voltage since conversion depends on external components | |
122 | * and that's what the ABI wants. | |
123 | */ | |
08bad5a8 MB |
124 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL, |
125 | WM831X_AUX_BATT_TEMP); | |
126 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, | |
127 | WM831X_AUX_BATT_TEMP); | |
128 | ||
129 | static struct attribute *wm831x_attributes[] = { | |
130 | &dev_attr_name.attr, | |
131 | ||
132 | &sensor_dev_attr_in0_input.dev_attr.attr, | |
133 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
134 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
135 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
136 | ||
137 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
138 | &sensor_dev_attr_in4_label.dev_attr.attr, | |
139 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
140 | &sensor_dev_attr_in5_label.dev_attr.attr, | |
141 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
142 | &sensor_dev_attr_in6_label.dev_attr.attr, | |
143 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
144 | &sensor_dev_attr_in7_label.dev_attr.attr, | |
145 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
146 | &sensor_dev_attr_in8_label.dev_attr.attr, | |
147 | ||
148 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
149 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
150 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
151 | &sensor_dev_attr_temp2_label.dev_attr.attr, | |
152 | ||
153 | NULL | |
154 | }; | |
155 | ||
156 | static const struct attribute_group wm831x_attr_group = { | |
157 | .attrs = wm831x_attributes, | |
158 | }; | |
159 | ||
6c931ae1 | 160 | static int wm831x_hwmon_probe(struct platform_device *pdev) |
08bad5a8 MB |
161 | { |
162 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
163 | struct wm831x_hwmon *hwmon; | |
164 | int ret; | |
165 | ||
e7d5bf7e GR |
166 | hwmon = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_hwmon), |
167 | GFP_KERNEL); | |
08bad5a8 MB |
168 | if (!hwmon) |
169 | return -ENOMEM; | |
170 | ||
171 | hwmon->wm831x = wm831x; | |
172 | ||
173 | ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group); | |
174 | if (ret) | |
e7d5bf7e | 175 | return ret; |
08bad5a8 MB |
176 | |
177 | hwmon->classdev = hwmon_device_register(&pdev->dev); | |
178 | if (IS_ERR(hwmon->classdev)) { | |
179 | ret = PTR_ERR(hwmon->classdev); | |
180 | goto err_sysfs; | |
181 | } | |
182 | ||
183 | platform_set_drvdata(pdev, hwmon); | |
184 | ||
185 | return 0; | |
186 | ||
187 | err_sysfs: | |
188 | sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); | |
08bad5a8 MB |
189 | return ret; |
190 | } | |
191 | ||
281dfd0b | 192 | static int wm831x_hwmon_remove(struct platform_device *pdev) |
08bad5a8 MB |
193 | { |
194 | struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev); | |
195 | ||
196 | hwmon_device_unregister(hwmon->classdev); | |
197 | sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); | |
08bad5a8 MB |
198 | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static struct platform_driver wm831x_hwmon_driver = { | |
203 | .probe = wm831x_hwmon_probe, | |
9e5e9b7a | 204 | .remove = wm831x_hwmon_remove, |
08bad5a8 MB |
205 | .driver = { |
206 | .name = "wm831x-hwmon", | |
207 | .owner = THIS_MODULE, | |
208 | }, | |
209 | }; | |
210 | ||
25a236a5 | 211 | module_platform_driver(wm831x_hwmon_driver); |
08bad5a8 MB |
212 | |
213 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
214 | MODULE_DESCRIPTION("WM831x Hardware Monitoring"); | |
215 | MODULE_LICENSE("GPL"); | |
216 | MODULE_ALIAS("platform:wm831x-hwmon"); |