xref: /openbmc/linux/drivers/hwmon/wm8350-hwmon.c (revision 21eb0be9)
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 
show_voltage(struct device * dev,struct device_attribute * attr,char * buf)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, 0, 0) * WM8350_AUX_COEFF;
33 	val = DIV_ROUND_CLOSEST(val, 1000);
34 
35 	return sprintf(buf, "%d\n", val);
36 }
37 
show_label(struct device * dev,struct device_attribute * attr,char * buf)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, "%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 
wm8350_hwmon_probe(struct platform_device * pdev)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(&pdev->dev, "wm8350",
75 							   wm8350,
76 							   wm8350_groups);
77 	return PTR_ERR_OR_ZERO(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