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
  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, 0, 0) * WM8350_AUX_COEFF;
  33         val = DIV_ROUND_CLOSEST(val, 1000);
  34
  35         return sprintf(buf, "%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, "%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(&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");