/* * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC * hardware monitoring features. * * Copyright (C) 2009 Wolfson Microelectronics plc * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License v2 as published by the * Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/mfd/wm8350/core.h> #include <linux/mfd/wm8350/comparator.h> static const char * const input_names[] = { [WM8350_AUXADC_USB] = "USB", [WM8350_AUXADC_LINE] = "Line", [WM8350_AUXADC_BATT] = "Battery", }; static ssize_t show_voltage(struct device *dev, struct device_attribute *attr, char *buf) { struct wm8350 *wm8350 = dev_get_drvdata(dev); int channel = to_sensor_dev_attr(attr)->index; int val; val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; val = DIV_ROUND_CLOSEST(val, 1000); return sprintf(buf, "%d\n", val); } static ssize_t show_label(struct device *dev, struct device_attribute *attr, char *buf) { int channel = to_sensor_dev_attr(attr)->index; return sprintf(buf, "%s\n", input_names[channel]); } #define WM8350_NAMED_VOLTAGE(id, name) \ static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ NULL, name); \ static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ NULL, name) WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); static struct attribute *wm8350_attrs[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in0_label.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in1_label.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in2_label.dev_attr.attr, NULL, }; ATTRIBUTE_GROUPS(wm8350); static int wm8350_hwmon_probe(struct platform_device *pdev) { struct wm8350 *wm8350 = platform_get_drvdata(pdev); struct device *hwmon_dev; hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350", wm8350, wm8350_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static struct platform_driver wm8350_hwmon_driver = { .probe = wm8350_hwmon_probe, .driver = { .name = "wm8350-hwmon", }, }; module_platform_driver(wm8350_hwmon_driver); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8350-hwmon");