1*fb6c023aSMark Brown /* 2*fb6c023aSMark Brown * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC 3*fb6c023aSMark Brown * hardware monitoring features. 4*fb6c023aSMark Brown * 5*fb6c023aSMark Brown * Copyright (C) 2009 Wolfson Microelectronics plc 6*fb6c023aSMark Brown * 7*fb6c023aSMark Brown * This program is free software; you can redistribute it and/or modify it 8*fb6c023aSMark Brown * under the terms of the GNU General Public License v2 as published by the 9*fb6c023aSMark Brown * Free Software Foundation. 10*fb6c023aSMark Brown * 11*fb6c023aSMark Brown * This program is distributed in the hope that it will be useful, but WITHOUT 12*fb6c023aSMark Brown * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13*fb6c023aSMark Brown * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14*fb6c023aSMark Brown * more details. 15*fb6c023aSMark Brown * 16*fb6c023aSMark Brown * You should have received a copy of the GNU General Public License along with 17*fb6c023aSMark Brown * this program; if not, write to the Free Software Foundation, Inc., 18*fb6c023aSMark Brown * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 19*fb6c023aSMark Brown */ 20*fb6c023aSMark Brown 21*fb6c023aSMark Brown #include <linux/kernel.h> 22*fb6c023aSMark Brown #include <linux/module.h> 23*fb6c023aSMark Brown #include <linux/err.h> 24*fb6c023aSMark Brown #include <linux/platform_device.h> 25*fb6c023aSMark Brown #include <linux/hwmon.h> 26*fb6c023aSMark Brown #include <linux/hwmon-sysfs.h> 27*fb6c023aSMark Brown 28*fb6c023aSMark Brown #include <linux/mfd/wm8350/core.h> 29*fb6c023aSMark Brown #include <linux/mfd/wm8350/comparator.h> 30*fb6c023aSMark Brown 31*fb6c023aSMark Brown static ssize_t show_name(struct device *dev, 32*fb6c023aSMark Brown struct device_attribute *attr, char *buf) 33*fb6c023aSMark Brown { 34*fb6c023aSMark Brown return sprintf(buf, "wm8350\n"); 35*fb6c023aSMark Brown } 36*fb6c023aSMark Brown 37*fb6c023aSMark Brown static const char *input_names[] = { 38*fb6c023aSMark Brown [WM8350_AUXADC_USB] = "USB", 39*fb6c023aSMark Brown [WM8350_AUXADC_LINE] = "Line", 40*fb6c023aSMark Brown [WM8350_AUXADC_BATT] = "Battery", 41*fb6c023aSMark Brown }; 42*fb6c023aSMark Brown 43*fb6c023aSMark Brown 44*fb6c023aSMark Brown static ssize_t show_voltage(struct device *dev, 45*fb6c023aSMark Brown struct device_attribute *attr, char *buf) 46*fb6c023aSMark Brown { 47*fb6c023aSMark Brown struct wm8350 *wm8350 = dev_get_drvdata(dev); 48*fb6c023aSMark Brown int channel = to_sensor_dev_attr(attr)->index; 49*fb6c023aSMark Brown int val; 50*fb6c023aSMark Brown 51*fb6c023aSMark Brown val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; 52*fb6c023aSMark Brown val = DIV_ROUND_CLOSEST(val, 1000); 53*fb6c023aSMark Brown 54*fb6c023aSMark Brown return sprintf(buf, "%d\n", val); 55*fb6c023aSMark Brown } 56*fb6c023aSMark Brown 57*fb6c023aSMark Brown static ssize_t show_label(struct device *dev, 58*fb6c023aSMark Brown struct device_attribute *attr, char *buf) 59*fb6c023aSMark Brown { 60*fb6c023aSMark Brown int channel = to_sensor_dev_attr(attr)->index; 61*fb6c023aSMark Brown 62*fb6c023aSMark Brown return sprintf(buf, "%s\n", input_names[channel]); 63*fb6c023aSMark Brown } 64*fb6c023aSMark Brown 65*fb6c023aSMark Brown #define WM8350_NAMED_VOLTAGE(id, name) \ 66*fb6c023aSMark Brown static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ 67*fb6c023aSMark Brown NULL, name); \ 68*fb6c023aSMark Brown static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ 69*fb6c023aSMark Brown NULL, name) 70*fb6c023aSMark Brown 71*fb6c023aSMark Brown static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 72*fb6c023aSMark Brown 73*fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); 74*fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); 75*fb6c023aSMark Brown WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); 76*fb6c023aSMark Brown 77*fb6c023aSMark Brown static struct attribute *wm8350_attributes[] = { 78*fb6c023aSMark Brown &dev_attr_name.attr, 79*fb6c023aSMark Brown 80*fb6c023aSMark Brown &sensor_dev_attr_in0_input.dev_attr.attr, 81*fb6c023aSMark Brown &sensor_dev_attr_in0_label.dev_attr.attr, 82*fb6c023aSMark Brown &sensor_dev_attr_in1_input.dev_attr.attr, 83*fb6c023aSMark Brown &sensor_dev_attr_in1_label.dev_attr.attr, 84*fb6c023aSMark Brown &sensor_dev_attr_in2_input.dev_attr.attr, 85*fb6c023aSMark Brown &sensor_dev_attr_in2_label.dev_attr.attr, 86*fb6c023aSMark Brown 87*fb6c023aSMark Brown NULL, 88*fb6c023aSMark Brown }; 89*fb6c023aSMark Brown 90*fb6c023aSMark Brown static const struct attribute_group wm8350_attr_group = { 91*fb6c023aSMark Brown .attrs = wm8350_attributes, 92*fb6c023aSMark Brown }; 93*fb6c023aSMark Brown 94*fb6c023aSMark Brown static int __devinit wm8350_hwmon_probe(struct platform_device *pdev) 95*fb6c023aSMark Brown { 96*fb6c023aSMark Brown struct wm8350 *wm8350 = platform_get_drvdata(pdev); 97*fb6c023aSMark Brown int ret; 98*fb6c023aSMark Brown 99*fb6c023aSMark Brown ret = sysfs_create_group(&pdev->dev.kobj, &wm8350_attr_group); 100*fb6c023aSMark Brown if (ret) 101*fb6c023aSMark Brown goto err; 102*fb6c023aSMark Brown 103*fb6c023aSMark Brown wm8350->hwmon.classdev = hwmon_device_register(&pdev->dev); 104*fb6c023aSMark Brown if (IS_ERR(wm8350->hwmon.classdev)) { 105*fb6c023aSMark Brown ret = PTR_ERR(wm8350->hwmon.classdev); 106*fb6c023aSMark Brown goto err_group; 107*fb6c023aSMark Brown } 108*fb6c023aSMark Brown 109*fb6c023aSMark Brown return 0; 110*fb6c023aSMark Brown 111*fb6c023aSMark Brown err_group: 112*fb6c023aSMark Brown sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group); 113*fb6c023aSMark Brown err: 114*fb6c023aSMark Brown return ret; 115*fb6c023aSMark Brown } 116*fb6c023aSMark Brown 117*fb6c023aSMark Brown static int __devexit wm8350_hwmon_remove(struct platform_device *pdev) 118*fb6c023aSMark Brown { 119*fb6c023aSMark Brown struct wm8350 *wm8350 = platform_get_drvdata(pdev); 120*fb6c023aSMark Brown 121*fb6c023aSMark Brown hwmon_device_unregister(wm8350->hwmon.classdev); 122*fb6c023aSMark Brown sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group); 123*fb6c023aSMark Brown 124*fb6c023aSMark Brown return 0; 125*fb6c023aSMark Brown } 126*fb6c023aSMark Brown 127*fb6c023aSMark Brown static struct platform_driver wm8350_hwmon_driver = { 128*fb6c023aSMark Brown .probe = wm8350_hwmon_probe, 129*fb6c023aSMark Brown .remove = __devexit_p(wm8350_hwmon_remove), 130*fb6c023aSMark Brown .driver = { 131*fb6c023aSMark Brown .name = "wm8350-hwmon", 132*fb6c023aSMark Brown .owner = THIS_MODULE, 133*fb6c023aSMark Brown }, 134*fb6c023aSMark Brown }; 135*fb6c023aSMark Brown 136*fb6c023aSMark Brown static int __init wm8350_hwmon_init(void) 137*fb6c023aSMark Brown { 138*fb6c023aSMark Brown return platform_driver_register(&wm8350_hwmon_driver); 139*fb6c023aSMark Brown } 140*fb6c023aSMark Brown module_init(wm8350_hwmon_init); 141*fb6c023aSMark Brown 142*fb6c023aSMark Brown static void __exit wm8350_hwmon_exit(void) 143*fb6c023aSMark Brown { 144*fb6c023aSMark Brown platform_driver_unregister(&wm8350_hwmon_driver); 145*fb6c023aSMark Brown } 146*fb6c023aSMark Brown module_exit(wm8350_hwmon_exit); 147*fb6c023aSMark Brown 148*fb6c023aSMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 149*fb6c023aSMark Brown MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); 150*fb6c023aSMark Brown MODULE_LICENSE("GPL"); 151*fb6c023aSMark Brown MODULE_ALIAS("platform:wm8350-hwmon"); 152