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 | |
19 | static const char * const input_names[] = { |
20 | [WM8350_AUXADC_USB] = "USB" , |
21 | [WM8350_AUXADC_LINE] = "Line" , |
22 | [WM8350_AUXADC_BATT] = "Battery" , |
23 | }; |
24 | |
25 | static 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, scale: 0, vref: 0) * WM8350_AUX_COEFF; |
33 | val = DIV_ROUND_CLOSEST(val, 1000); |
34 | |
35 | return sprintf(buf, fmt: "%d\n" , val); |
36 | } |
37 | |
38 | static 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, fmt: "%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 | |
52 | WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); |
53 | WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); |
54 | WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); |
55 | |
56 | static 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 | |
67 | ATTRIBUTE_GROUPS(wm8350); |
68 | |
69 | static 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(dev: &pdev->dev, name: "wm8350" , |
75 | drvdata: wm8350, |
76 | groups: wm8350_groups); |
77 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
78 | } |
79 | |
80 | static struct platform_driver wm8350_hwmon_driver = { |
81 | .probe = wm8350_hwmon_probe, |
82 | .driver = { |
83 | .name = "wm8350-hwmon" , |
84 | }, |
85 | }; |
86 | |
87 | module_platform_driver(wm8350_hwmon_driver); |
88 | |
89 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>" ); |
90 | MODULE_DESCRIPTION("WM8350 Hardware Monitoring" ); |
91 | MODULE_LICENSE("GPL" ); |
92 | MODULE_ALIAS("platform:wm8350-hwmon" ); |
93 | |