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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 | ||
31 | struct wm831x_hwmon { | |
32 | struct wm831x *wm831x; | |
33 | struct device *classdev; | |
34 | }; | |
35 | ||
36 | static ssize_t show_name(struct device *dev, | |
37 | struct device_attribute *attr, char *buf) | |
38 | { | |
39 | return sprintf(buf, "wm831x\n"); | |
40 | } | |
41 | ||
42 | static 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 | ||
53 | static 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 | ||
67 | static 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 | ||
85 | static 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 | ||
102 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
103 | ||
104 | WM831X_VOLTAGE(0, WM831X_AUX_AUX1); | |
105 | WM831X_VOLTAGE(1, WM831X_AUX_AUX2); | |
106 | WM831X_VOLTAGE(2, WM831X_AUX_AUX3); | |
107 | WM831X_VOLTAGE(3, WM831X_AUX_AUX4); | |
108 | ||
109 | WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD); | |
110 | WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB); | |
111 | WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT); | |
112 | WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL); | |
113 | WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT); | |
114 | ||
115 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL, | |
116 | WM831X_AUX_CHIP_TEMP); | |
117 | static 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. */ | |
121 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL, | |
122 | WM831X_AUX_BATT_TEMP); | |
123 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, | |
124 | WM831X_AUX_BATT_TEMP); | |
125 | ||
126 | static 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 | ||
153 | static const struct attribute_group wm831x_attr_group = { | |
154 | .attrs = wm831x_attributes, | |
155 | }; | |
156 | ||
157 | static 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 | ||
183 | err_sysfs: | |
184 | sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); | |
185 | err: | |
186 | kfree(hwmon); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | static 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 | ||
202 | static 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 | ||
211 | static int __init wm831x_hwmon_init(void) | |
212 | { | |
213 | return platform_driver_register(&wm831x_hwmon_driver); | |
214 | } | |
215 | module_init(wm831x_hwmon_init); | |
216 | ||
217 | static void __exit wm831x_hwmon_exit(void) | |
218 | { | |
219 | platform_driver_unregister(&wm831x_hwmon_driver); | |
220 | } | |
221 | module_exit(wm831x_hwmon_exit); | |
222 | ||
223 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
224 | MODULE_DESCRIPTION("WM831x Hardware Monitoring"); | |
225 | MODULE_LICENSE("GPL"); | |
226 | MODULE_ALIAS("platform:wm831x-hwmon"); |