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"); 93