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1 | /* |
2 | * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 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/err.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-sysfs.h> | |
27 | ||
28 | #include <linux/mfd/wm8350/core.h> | |
29 | #include <linux/mfd/wm8350/comparator.h> | |
30 | ||
a68abd32 | 31 | static const char * const input_names[] = { |
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32 | [WM8350_AUXADC_USB] = "USB", |
33 | [WM8350_AUXADC_LINE] = "Line", | |
34 | [WM8350_AUXADC_BATT] = "Battery", | |
35 | }; | |
36 | ||
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37 | static ssize_t show_voltage(struct device *dev, |
38 | struct device_attribute *attr, char *buf) | |
39 | { | |
40 | struct wm8350 *wm8350 = dev_get_drvdata(dev); | |
41 | int channel = to_sensor_dev_attr(attr)->index; | |
42 | int val; | |
43 | ||
44 | val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; | |
45 | val = DIV_ROUND_CLOSEST(val, 1000); | |
46 | ||
47 | return sprintf(buf, "%d\n", val); | |
48 | } | |
49 | ||
50 | static ssize_t show_label(struct device *dev, | |
51 | struct device_attribute *attr, char *buf) | |
52 | { | |
53 | int channel = to_sensor_dev_attr(attr)->index; | |
54 | ||
55 | return sprintf(buf, "%s\n", input_names[channel]); | |
56 | } | |
57 | ||
58 | #define WM8350_NAMED_VOLTAGE(id, name) \ | |
59 | static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ | |
60 | NULL, name); \ | |
61 | static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ | |
62 | NULL, name) | |
63 | ||
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64 | WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); |
65 | WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); | |
66 | WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); | |
67 | ||
b3aabd6d | 68 | static struct attribute *wm8350_attrs[] = { |
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69 | &sensor_dev_attr_in0_input.dev_attr.attr, |
70 | &sensor_dev_attr_in0_label.dev_attr.attr, | |
71 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
72 | &sensor_dev_attr_in1_label.dev_attr.attr, | |
73 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
74 | &sensor_dev_attr_in2_label.dev_attr.attr, | |
75 | ||
76 | NULL, | |
77 | }; | |
78 | ||
b3aabd6d | 79 | ATTRIBUTE_GROUPS(wm8350); |
fb6c023a | 80 | |
6c931ae1 | 81 | static int wm8350_hwmon_probe(struct platform_device *pdev) |
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82 | { |
83 | struct wm8350 *wm8350 = platform_get_drvdata(pdev); | |
b3aabd6d | 84 | struct device *hwmon_dev; |
fb6c023a | 85 | |
b3aabd6d AL |
86 | hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350", |
87 | wm8350, | |
88 | wm8350_groups); | |
89 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
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90 | } |
91 | ||
92 | static struct platform_driver wm8350_hwmon_driver = { | |
93 | .probe = wm8350_hwmon_probe, | |
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94 | .driver = { |
95 | .name = "wm8350-hwmon", | |
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96 | }, |
97 | }; | |
98 | ||
25a236a5 | 99 | module_platform_driver(wm8350_hwmon_driver); |
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100 | |
101 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
102 | MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); | |
103 | MODULE_LICENSE("GPL"); | |
104 | MODULE_ALIAS("platform:wm8350-hwmon"); |