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
31static const char * const input_names[] = {
32 [WM8350_AUXADC_USB] = "USB",
33 [WM8350_AUXADC_LINE] = "Line",
34 [WM8350_AUXADC_BATT] = "Battery",
35};
36
37static 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
50static 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
64WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
65WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
66WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
67
68static struct attribute *wm8350_attrs[] = {
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
79ATTRIBUTE_GROUPS(wm8350);
80
81static int wm8350_hwmon_probe(struct platform_device *pdev)
82{
83 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
84 struct device *hwmon_dev;
85
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);
90}
91
92static struct platform_driver wm8350_hwmon_driver = {
93 .probe = wm8350_hwmon_probe,
94 .driver = {
95 .name = "wm8350-hwmon",
96 },
97};
98
99module_platform_driver(wm8350_hwmon_driver);
100
101MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
102MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
103MODULE_LICENSE("GPL");
104MODULE_ALIAS("platform:wm8350-hwmon");
105