wm831x-hwmon.c (4455B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x 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/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 components 96 * 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 NULL 126}; 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");