LXR linux/drivers/hwmon/wm8350-hwmon.c

   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");
  93