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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> | |
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 | ||
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"); |