PageRenderTime 25ms CodeModel.GetById 12ms app.highlight 8ms RepoModel.GetById 2ms app.codeStats 0ms

/drivers/hwmon/wm8350-hwmon.c

http://github.com/mirrors/linux
C | 92 lines | 67 code | 18 blank | 7 comment | 0 complexity | 5f17371cbaace5818844963c57108d76 MD5 | raw file
 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC
 4 *                                  hardware monitoring features.
 5 *
 6 * Copyright (C) 2009 Wolfson Microelectronics plc
 7 */
 8
 9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/err.h>
12#include <linux/platform_device.h>
13#include <linux/hwmon.h>
14#include <linux/hwmon-sysfs.h>
15
16#include <linux/mfd/wm8350/core.h>
17#include <linux/mfd/wm8350/comparator.h>
18
19static const char * const input_names[] = {
20	[WM8350_AUXADC_USB]  = "USB",
21	[WM8350_AUXADC_LINE] = "Line",
22	[WM8350_AUXADC_BATT] = "Battery",
23};
24
25static ssize_t show_voltage(struct device *dev,
26			    struct device_attribute *attr, char *buf)
27{
28	struct wm8350 *wm8350 = dev_get_drvdata(dev);
29	int channel = to_sensor_dev_attr(attr)->index;
30	int val;
31
32	val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF;
33	val = DIV_ROUND_CLOSEST(val, 1000);
34
35	return sprintf(buf, "%d\n", val);
36}
37
38static ssize_t show_label(struct device *dev,
39			  struct device_attribute *attr, char *buf)
40{
41	int channel = to_sensor_dev_attr(attr)->index;
42
43	return sprintf(buf, "%s\n", input_names[channel]);
44}
45
46#define WM8350_NAMED_VOLTAGE(id, name) \
47	static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\
48				  NULL, name);		\
49	static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,	\
50				  NULL, name)
51
52WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
53WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
54WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
55
56static struct attribute *wm8350_attrs[] = {
57	&sensor_dev_attr_in0_input.dev_attr.attr,
58	&sensor_dev_attr_in0_label.dev_attr.attr,
59	&sensor_dev_attr_in1_input.dev_attr.attr,
60	&sensor_dev_attr_in1_label.dev_attr.attr,
61	&sensor_dev_attr_in2_input.dev_attr.attr,
62	&sensor_dev_attr_in2_label.dev_attr.attr,
63
64	NULL,
65};
66
67ATTRIBUTE_GROUPS(wm8350);
68
69static int wm8350_hwmon_probe(struct platform_device *pdev)
70{
71	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
72	struct device *hwmon_dev;
73
74	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350",
75							   wm8350,
76							   wm8350_groups);
77	return PTR_ERR_OR_ZERO(hwmon_dev);
78}
79
80static struct platform_driver wm8350_hwmon_driver = {
81	.probe = wm8350_hwmon_probe,
82	.driver = {
83		.name = "wm8350-hwmon",
84	},
85};
86
87module_platform_driver(wm8350_hwmon_driver);
88
89MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
90MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
91MODULE_LICENSE("GPL");
92MODULE_ALIAS("platform:wm8350-hwmon");