1fb6c023aSMark Brown /* 2fb6c023aSMark Brown * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC 3fb6c023aSMark Brown * hardware monitoring features. 4fb6c023aSMark Brown * 5fb6c023aSMark Brown * Copyright (C) 2009 Wolfson Microelectronics plc 6fb6c023aSMark Brown * 7fb6c023aSMark Brown * This program is free software; you can redistribute it and/or modify it 8fb6c023aSMark Brown * under the terms of the GNU General Public License v2 as published by the 9fb6c023aSMark Brown * Free Software Foundation. 10fb6c023aSMark Brown * 11fb6c023aSMark Brown * This program is distributed in the hope that it will be useful, but WITHOUT 12fb6c023aSMark Brown * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13fb6c023aSMark Brown * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14fb6c023aSMark Brown * more details. 15fb6c023aSMark Brown * 16fb6c023aSMark Brown * You should have received a copy of the GNU General Public License along with 17fb6c023aSMark Brown * this program; if not, write to the Free Software Foundation, Inc., 18fb6c023aSMark Brown * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 19fb6c023aSMark Brown */ 20fb6c023aSMark Brown 21fb6c023aSMark Brown #include <linux/kernel.h> 22fb6c023aSMark Brown #include <linux/module.h> 23fb6c023aSMark Brown #include <linux/err.h> 24fb6c023aSMark Brown #include <linux/platform_device.h> 25fb6c023aSMark Brown #include <linux/hwmon.h> 26fb6c023aSMark Brown #include <linux/hwmon-sysfs.h> 27fb6c023aSMark Brown 28fb6c023aSMark Brown #include <linux/mfd/wm8350/core.h> 29fb6c023aSMark Brown #include <linux/mfd/wm8350/comparator.h> 30fb6c023aSMark Brown 31a68abd32SGuenter Roeck static const char * const input_names[] = { 32fb6c023aSMark Brown [WM8350_AUXADC_USB] = "USB", 33fb6c023aSMark Brown [WM8350_AUXADC_LINE] = "Line", 34fb6c023aSMark Brown [WM8350_AUXADC_BATT] = "Battery", 35fb6c023aSMark Brown }; 36fb6c023aSMark Brown 37fb6c023aSMark Brown static ssize_t show_voltage(struct device *dev, 38fb6c023aSMark Brown struct device_attribute *attr, char *buf) 39fb6c023aSMark Brown { 40fb6c023aSMark Brown struct wm8350 *wm8350 = dev_get_drvdata(dev); 41fb6c023aSMark Brown int channel = to_sensor_dev_attr(attr)->index; 42fb6c023aSMark Brown int val; 43fb6c023aSMark Brown 44fb6c023aSMark Brown val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; 45fb6c023aSMark Brown val = DIV_ROUND_CLOSEST(val, 1000); 46fb6c023aSMark Brown 47fb6c023aSMark Brown return sprintf(buf, "%d\n", val); 48fb6c023aSMark Brown } 49fb6c023aSMark Brown 50fb6c023aSMark Brown static ssize_t show_label(struct device *dev, 51fb6c023aSMark Brown struct device_attribute *attr, char *buf) 52fb6c023aSMark Brown { 53fb6c023aSMark Brown int channel = to_sensor_dev_attr(attr)->index; 54fb6c023aSMark Brown 55fb6c023aSMark Brown return sprintf(buf, "%s\n", input_names[channel]); 56fb6c023aSMark Brown } 57fb6c023aSMark Brown 58fb6c023aSMark Brown #define WM8350_NAMED_VOLTAGE(id, name) \ 59fb6c023aSMark Brown static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ 60fb6c023aSMark Brown NULL, name); \ 61fb6c023aSMark Brown static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ 62fb6c023aSMark Brown NULL, name) 63fb6c023aSMark Brown 64fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); 65fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); 66fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); 67fb6c023aSMark Brown 68*b3aabd6dSAxel Lin static struct attribute *wm8350_attrs[] = { 69fb6c023aSMark Brown &sensor_dev_attr_in0_input.dev_attr.attr, 70fb6c023aSMark Brown &sensor_dev_attr_in0_label.dev_attr.attr, 71fb6c023aSMark Brown &sensor_dev_attr_in1_input.dev_attr.attr, 72fb6c023aSMark Brown &sensor_dev_attr_in1_label.dev_attr.attr, 73fb6c023aSMark Brown &sensor_dev_attr_in2_input.dev_attr.attr, 74fb6c023aSMark Brown &sensor_dev_attr_in2_label.dev_attr.attr, 75fb6c023aSMark Brown 76fb6c023aSMark Brown NULL, 77fb6c023aSMark Brown }; 78fb6c023aSMark Brown 79*b3aabd6dSAxel Lin ATTRIBUTE_GROUPS(wm8350); 80fb6c023aSMark Brown 816c931ae1SBill Pemberton static int wm8350_hwmon_probe(struct platform_device *pdev) 82fb6c023aSMark Brown { 83fb6c023aSMark Brown struct wm8350 *wm8350 = platform_get_drvdata(pdev); 84*b3aabd6dSAxel Lin struct device *hwmon_dev; 85fb6c023aSMark Brown 86*b3aabd6dSAxel Lin hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350", 87*b3aabd6dSAxel Lin wm8350, 88*b3aabd6dSAxel Lin wm8350_groups); 89*b3aabd6dSAxel Lin return PTR_ERR_OR_ZERO(hwmon_dev); 90fb6c023aSMark Brown } 91fb6c023aSMark Brown 92fb6c023aSMark Brown static struct platform_driver wm8350_hwmon_driver = { 93fb6c023aSMark Brown .probe = wm8350_hwmon_probe, 94fb6c023aSMark Brown .driver = { 95fb6c023aSMark Brown .name = "wm8350-hwmon", 96fb6c023aSMark Brown .owner = THIS_MODULE, 97fb6c023aSMark Brown }, 98fb6c023aSMark Brown }; 99fb6c023aSMark Brown 10025a236a5SAxel Lin module_platform_driver(wm8350_hwmon_driver); 101fb6c023aSMark Brown 102fb6c023aSMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 103fb6c023aSMark Brown MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); 104fb6c023aSMark Brown MODULE_LICENSE("GPL"); 105fb6c023aSMark Brown MODULE_ALIAS("platform:wm8350-hwmon"); 106