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 31fb6c023aSMark Brown static ssize_t show_name(struct device *dev, 32fb6c023aSMark Brown struct device_attribute *attr, char *buf) 33fb6c023aSMark Brown { 34fb6c023aSMark Brown return sprintf(buf, "wm8350\n"); 35fb6c023aSMark Brown } 36fb6c023aSMark Brown 37fb6c023aSMark Brown static const char *input_names[] = { 38fb6c023aSMark Brown [WM8350_AUXADC_USB] = "USB", 39fb6c023aSMark Brown [WM8350_AUXADC_LINE] = "Line", 40fb6c023aSMark Brown [WM8350_AUXADC_BATT] = "Battery", 41fb6c023aSMark Brown }; 42fb6c023aSMark Brown 43fb6c023aSMark Brown 44fb6c023aSMark Brown static ssize_t show_voltage(struct device *dev, 45fb6c023aSMark Brown struct device_attribute *attr, char *buf) 46fb6c023aSMark Brown { 47fb6c023aSMark Brown struct wm8350 *wm8350 = dev_get_drvdata(dev); 48fb6c023aSMark Brown int channel = to_sensor_dev_attr(attr)->index; 49fb6c023aSMark Brown int val; 50fb6c023aSMark Brown 51fb6c023aSMark Brown val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; 52fb6c023aSMark Brown val = DIV_ROUND_CLOSEST(val, 1000); 53fb6c023aSMark Brown 54fb6c023aSMark Brown return sprintf(buf, "%d\n", val); 55fb6c023aSMark Brown } 56fb6c023aSMark Brown 57fb6c023aSMark Brown static ssize_t show_label(struct device *dev, 58fb6c023aSMark Brown struct device_attribute *attr, char *buf) 59fb6c023aSMark Brown { 60fb6c023aSMark Brown int channel = to_sensor_dev_attr(attr)->index; 61fb6c023aSMark Brown 62fb6c023aSMark Brown return sprintf(buf, "%s\n", input_names[channel]); 63fb6c023aSMark Brown } 64fb6c023aSMark Brown 65fb6c023aSMark Brown #define WM8350_NAMED_VOLTAGE(id, name) \ 66fb6c023aSMark Brown static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ 67fb6c023aSMark Brown NULL, name); \ 68fb6c023aSMark Brown static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ 69fb6c023aSMark Brown NULL, name) 70fb6c023aSMark Brown 71fb6c023aSMark Brown static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 72fb6c023aSMark Brown 73fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); 74fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); 75fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); 76fb6c023aSMark Brown 77fb6c023aSMark Brown static struct attribute *wm8350_attributes[] = { 78fb6c023aSMark Brown &dev_attr_name.attr, 79fb6c023aSMark Brown 80fb6c023aSMark Brown &sensor_dev_attr_in0_input.dev_attr.attr, 81fb6c023aSMark Brown &sensor_dev_attr_in0_label.dev_attr.attr, 82fb6c023aSMark Brown &sensor_dev_attr_in1_input.dev_attr.attr, 83fb6c023aSMark Brown &sensor_dev_attr_in1_label.dev_attr.attr, 84fb6c023aSMark Brown &sensor_dev_attr_in2_input.dev_attr.attr, 85fb6c023aSMark Brown &sensor_dev_attr_in2_label.dev_attr.attr, 86fb6c023aSMark Brown 87fb6c023aSMark Brown NULL, 88fb6c023aSMark Brown }; 89fb6c023aSMark Brown 90fb6c023aSMark Brown static const struct attribute_group wm8350_attr_group = { 91fb6c023aSMark Brown .attrs = wm8350_attributes, 92fb6c023aSMark Brown }; 93fb6c023aSMark Brown 94fb6c023aSMark Brown static int __devinit wm8350_hwmon_probe(struct platform_device *pdev) 95fb6c023aSMark Brown { 96fb6c023aSMark Brown struct wm8350 *wm8350 = platform_get_drvdata(pdev); 97fb6c023aSMark Brown int ret; 98fb6c023aSMark Brown 99fb6c023aSMark Brown ret = sysfs_create_group(&pdev->dev.kobj, &wm8350_attr_group); 100fb6c023aSMark Brown if (ret) 101fb6c023aSMark Brown goto err; 102fb6c023aSMark Brown 103fb6c023aSMark Brown wm8350->hwmon.classdev = hwmon_device_register(&pdev->dev); 104fb6c023aSMark Brown if (IS_ERR(wm8350->hwmon.classdev)) { 105fb6c023aSMark Brown ret = PTR_ERR(wm8350->hwmon.classdev); 106fb6c023aSMark Brown goto err_group; 107fb6c023aSMark Brown } 108fb6c023aSMark Brown 109fb6c023aSMark Brown return 0; 110fb6c023aSMark Brown 111fb6c023aSMark Brown err_group: 112fb6c023aSMark Brown sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group); 113fb6c023aSMark Brown err: 114fb6c023aSMark Brown return ret; 115fb6c023aSMark Brown } 116fb6c023aSMark Brown 117fb6c023aSMark Brown static int __devexit wm8350_hwmon_remove(struct platform_device *pdev) 118fb6c023aSMark Brown { 119fb6c023aSMark Brown struct wm8350 *wm8350 = platform_get_drvdata(pdev); 120fb6c023aSMark Brown 121fb6c023aSMark Brown hwmon_device_unregister(wm8350->hwmon.classdev); 122fb6c023aSMark Brown sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group); 123fb6c023aSMark Brown 124fb6c023aSMark Brown return 0; 125fb6c023aSMark Brown } 126fb6c023aSMark Brown 127fb6c023aSMark Brown static struct platform_driver wm8350_hwmon_driver = { 128fb6c023aSMark Brown .probe = wm8350_hwmon_probe, 129fb6c023aSMark Brown .remove = __devexit_p(wm8350_hwmon_remove), 130fb6c023aSMark Brown .driver = { 131fb6c023aSMark Brown .name = "wm8350-hwmon", 132fb6c023aSMark Brown .owner = THIS_MODULE, 133fb6c023aSMark Brown }, 134fb6c023aSMark Brown }; 135fb6c023aSMark Brown 136*25a236a5SAxel Lin module_platform_driver(wm8350_hwmon_driver); 137fb6c023aSMark Brown 138fb6c023aSMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 139fb6c023aSMark Brown MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); 140fb6c023aSMark Brown MODULE_LICENSE("GPL"); 141fb6c023aSMark Brown MODULE_ALIAS("platform:wm8350-hwmon"); 142