1 /* 2 * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC 3 * hardware monitoring features. 4 * 5 * Copyright (C) 2009 Wolfson Microelectronics plc 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License v2 as published by the 9 * Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/err.h> 24 #include <linux/platform_device.h> 25 #include <linux/hwmon.h> 26 #include <linux/hwmon-sysfs.h> 27 28 #include <linux/mfd/wm8350/core.h> 29 #include <linux/mfd/wm8350/comparator.h> 30 31 static const char * const input_names[] = { 32 [WM8350_AUXADC_USB] = "USB", 33 [WM8350_AUXADC_LINE] = "Line", 34 [WM8350_AUXADC_BATT] = "Battery", 35 }; 36 37 static ssize_t show_voltage(struct device *dev, 38 struct device_attribute *attr, char *buf) 39 { 40 struct wm8350 *wm8350 = dev_get_drvdata(dev); 41 int channel = to_sensor_dev_attr(attr)->index; 42 int val; 43 44 val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; 45 val = DIV_ROUND_CLOSEST(val, 1000); 46 47 return sprintf(buf, "%d\n", val); 48 } 49 50 static ssize_t show_label(struct device *dev, 51 struct device_attribute *attr, char *buf) 52 { 53 int channel = to_sensor_dev_attr(attr)->index; 54 55 return sprintf(buf, "%s\n", input_names[channel]); 56 } 57 58 #define WM8350_NAMED_VOLTAGE(id, name) \ 59 static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ 60 NULL, name); \ 61 static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ 62 NULL, name) 63 64 WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); 65 WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); 66 WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); 67 68 static struct attribute *wm8350_attrs[] = { 69 &sensor_dev_attr_in0_input.dev_attr.attr, 70 &sensor_dev_attr_in0_label.dev_attr.attr, 71 &sensor_dev_attr_in1_input.dev_attr.attr, 72 &sensor_dev_attr_in1_label.dev_attr.attr, 73 &sensor_dev_attr_in2_input.dev_attr.attr, 74 &sensor_dev_attr_in2_label.dev_attr.attr, 75 76 NULL, 77 }; 78 79 ATTRIBUTE_GROUPS(wm8350); 80 81 static int wm8350_hwmon_probe(struct platform_device *pdev) 82 { 83 struct wm8350 *wm8350 = platform_get_drvdata(pdev); 84 struct device *hwmon_dev; 85 86 hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350", 87 wm8350, 88 wm8350_groups); 89 return PTR_ERR_OR_ZERO(hwmon_dev); 90 } 91 92 static struct platform_driver wm8350_hwmon_driver = { 93 .probe = wm8350_hwmon_probe, 94 .driver = { 95 .name = "wm8350-hwmon", 96 }, 97 }; 98 99 module_platform_driver(wm8350_hwmon_driver); 100 101 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 102 MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); 103 MODULE_LICENSE("GPL"); 104 MODULE_ALIAS("platform:wm8350-hwmon"); 105