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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x 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/platform_device.h>12#include <linux/err.h>13#include <linux/hwmon.h>14#include <linux/hwmon-sysfs.h>15#include <linux/slab.h>16 17#include <linux/mfd/wm831x/core.h>18#include <linux/mfd/wm831x/auxadc.h>19 20static const char * const input_names[] = {21 [WM831X_AUX_SYSVDD] = "SYSVDD",22 [WM831X_AUX_USB] = "USB",23 [WM831X_AUX_BKUP_BATT] = "Backup battery",24 [WM831X_AUX_BATT] = "Battery",25 [WM831X_AUX_WALL] = "WALL",26 [WM831X_AUX_CHIP_TEMP] = "PMIC",27 [WM831X_AUX_BATT_TEMP] = "Battery",28};29 30static ssize_t show_voltage(struct device *dev,31 struct device_attribute *attr, char *buf)32{33 struct wm831x *wm831x = dev_get_drvdata(dev);34 int channel = to_sensor_dev_attr(attr)->index;35 int ret;36 37 ret = wm831x_auxadc_read_uv(wm831x, channel);38 if (ret < 0)39 return ret;40 41 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));42}43 44static ssize_t show_chip_temp(struct device *dev,45 struct device_attribute *attr, char *buf)46{47 struct wm831x *wm831x = dev_get_drvdata(dev);48 int channel = to_sensor_dev_attr(attr)->index;49 int ret;50 51 ret = wm831x_auxadc_read(wm831x, channel);52 if (ret < 0)53 return ret;54 55 /* Degrees celsius = (512.18-ret) / 1.0983 */56 ret = 512180 - (ret * 1000);57 ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);58 59 return sprintf(buf, "%d\n", ret);60}61 62static ssize_t show_label(struct device *dev,63 struct device_attribute *attr, char *buf)64{65 int channel = to_sensor_dev_attr(attr)->index;66 67 return sprintf(buf, "%s\n", input_names[channel]);68}69 70#define WM831X_VOLTAGE(id, name) \71 static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \72 NULL, name)73 74#define WM831X_NAMED_VOLTAGE(id, name) \75 WM831X_VOLTAGE(id, name); \76 static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \77 NULL, name)78 79WM831X_VOLTAGE(0, WM831X_AUX_AUX1);80WM831X_VOLTAGE(1, WM831X_AUX_AUX2);81WM831X_VOLTAGE(2, WM831X_AUX_AUX3);82WM831X_VOLTAGE(3, WM831X_AUX_AUX4);83 84WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);85WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);86WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);87WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);88WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);89 90static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,91 WM831X_AUX_CHIP_TEMP);92static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,93 WM831X_AUX_CHIP_TEMP);94/*95 * Report as a voltage since conversion depends on external components96 * and that's what the ABI wants.97 */98static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,99 WM831X_AUX_BATT_TEMP);100static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,101 WM831X_AUX_BATT_TEMP);102 103static struct attribute *wm831x_attrs[] = {104 &sensor_dev_attr_in0_input.dev_attr.attr,105 &sensor_dev_attr_in1_input.dev_attr.attr,106 &sensor_dev_attr_in2_input.dev_attr.attr,107 &sensor_dev_attr_in3_input.dev_attr.attr,108 109 &sensor_dev_attr_in4_input.dev_attr.attr,110 &sensor_dev_attr_in4_label.dev_attr.attr,111 &sensor_dev_attr_in5_input.dev_attr.attr,112 &sensor_dev_attr_in5_label.dev_attr.attr,113 &sensor_dev_attr_in6_input.dev_attr.attr,114 &sensor_dev_attr_in6_label.dev_attr.attr,115 &sensor_dev_attr_in7_input.dev_attr.attr,116 &sensor_dev_attr_in7_label.dev_attr.attr,117 &sensor_dev_attr_in8_input.dev_attr.attr,118 &sensor_dev_attr_in8_label.dev_attr.attr,119 120 &sensor_dev_attr_temp1_input.dev_attr.attr,121 &sensor_dev_attr_temp1_label.dev_attr.attr,122 &sensor_dev_attr_temp2_input.dev_attr.attr,123 &sensor_dev_attr_temp2_label.dev_attr.attr,124 125 NULL126};127 128ATTRIBUTE_GROUPS(wm831x);129 130static int wm831x_hwmon_probe(struct platform_device *pdev)131{132 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);133 struct device *hwmon_dev;134 135 hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x",136 wm831x,137 wm831x_groups);138 return PTR_ERR_OR_ZERO(hwmon_dev);139}140 141static struct platform_driver wm831x_hwmon_driver = {142 .probe = wm831x_hwmon_probe,143 .driver = {144 .name = "wm831x-hwmon",145 },146};147 148module_platform_driver(wm831x_hwmon_driver);149 150MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");151MODULE_DESCRIPTION("WM831x Hardware Monitoring");152MODULE_LICENSE("GPL");153MODULE_ALIAS("platform:wm831x-hwmon");154