1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC
4*4882a593Smuzhiyun * hardware monitoring features.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2009 Wolfson Microelectronics plc
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/err.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun #include <linux/hwmon.h>
14*4882a593Smuzhiyun #include <linux/hwmon-sysfs.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <linux/mfd/wm8350/core.h>
17*4882a593Smuzhiyun #include <linux/mfd/wm8350/comparator.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static const char * const input_names[] = {
20*4882a593Smuzhiyun [WM8350_AUXADC_USB] = "USB",
21*4882a593Smuzhiyun [WM8350_AUXADC_LINE] = "Line",
22*4882a593Smuzhiyun [WM8350_AUXADC_BATT] = "Battery",
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
show_voltage(struct device * dev,struct device_attribute * attr,char * buf)25*4882a593Smuzhiyun static ssize_t show_voltage(struct device *dev,
26*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct wm8350 *wm8350 = dev_get_drvdata(dev);
29*4882a593Smuzhiyun int channel = to_sensor_dev_attr(attr)->index;
30*4882a593Smuzhiyun int val;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF;
33*4882a593Smuzhiyun val = DIV_ROUND_CLOSEST(val, 1000);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return sprintf(buf, "%d\n", val);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
show_label(struct device * dev,struct device_attribute * attr,char * buf)38*4882a593Smuzhiyun static ssize_t show_label(struct device *dev,
39*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun int channel = to_sensor_dev_attr(attr)->index;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun return sprintf(buf, "%s\n", input_names[channel]);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun #define WM8350_NAMED_VOLTAGE(id, name) \
47*4882a593Smuzhiyun static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\
48*4882a593Smuzhiyun NULL, name); \
49*4882a593Smuzhiyun static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
50*4882a593Smuzhiyun NULL, name)
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
53*4882a593Smuzhiyun WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
54*4882a593Smuzhiyun WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun static struct attribute *wm8350_attrs[] = {
57*4882a593Smuzhiyun &sensor_dev_attr_in0_input.dev_attr.attr,
58*4882a593Smuzhiyun &sensor_dev_attr_in0_label.dev_attr.attr,
59*4882a593Smuzhiyun &sensor_dev_attr_in1_input.dev_attr.attr,
60*4882a593Smuzhiyun &sensor_dev_attr_in1_label.dev_attr.attr,
61*4882a593Smuzhiyun &sensor_dev_attr_in2_input.dev_attr.attr,
62*4882a593Smuzhiyun &sensor_dev_attr_in2_label.dev_attr.attr,
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun NULL,
65*4882a593Smuzhiyun };
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun ATTRIBUTE_GROUPS(wm8350);
68*4882a593Smuzhiyun
wm8350_hwmon_probe(struct platform_device * pdev)69*4882a593Smuzhiyun static int wm8350_hwmon_probe(struct platform_device *pdev)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun struct wm8350 *wm8350 = platform_get_drvdata(pdev);
72*4882a593Smuzhiyun struct device *hwmon_dev;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350",
75*4882a593Smuzhiyun wm8350,
76*4882a593Smuzhiyun wm8350_groups);
77*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(hwmon_dev);
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun static struct platform_driver wm8350_hwmon_driver = {
81*4882a593Smuzhiyun .probe = wm8350_hwmon_probe,
82*4882a593Smuzhiyun .driver = {
83*4882a593Smuzhiyun .name = "wm8350-hwmon",
84*4882a593Smuzhiyun },
85*4882a593Smuzhiyun };
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun module_platform_driver(wm8350_hwmon_driver);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
90*4882a593Smuzhiyun MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
91*4882a593Smuzhiyun MODULE_LICENSE("GPL");
92*4882a593Smuzhiyun MODULE_ALIAS("platform:wm8350-hwmon");
93