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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC4 * hardware monitoring features.5 *6 * Copyright (C) 2009 Wolfson Microelectronics plc7 */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