1*08bad5a8SMark Brown /* 2*08bad5a8SMark Brown * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC 3*08bad5a8SMark Brown * hardware monitoring features. 4*08bad5a8SMark Brown * 5*08bad5a8SMark Brown * Copyright (C) 2009 Wolfson Microelectronics plc 6*08bad5a8SMark Brown * 7*08bad5a8SMark Brown * This program is free software; you can redistribute it and/or modify it 8*08bad5a8SMark Brown * under the terms of the GNU General Public License v2 as published by the 9*08bad5a8SMark Brown * Free Software Foundation. 10*08bad5a8SMark Brown * 11*08bad5a8SMark Brown * This program is distributed in the hope that it will be useful, but WITHOUT 12*08bad5a8SMark Brown * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13*08bad5a8SMark Brown * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14*08bad5a8SMark Brown * more details. 15*08bad5a8SMark Brown * 16*08bad5a8SMark Brown * You should have received a copy of the GNU General Public License along with 17*08bad5a8SMark Brown * this program; if not, write to the Free Software Foundation, Inc., 18*08bad5a8SMark Brown * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 19*08bad5a8SMark Brown */ 20*08bad5a8SMark Brown 21*08bad5a8SMark Brown #include <linux/kernel.h> 22*08bad5a8SMark Brown #include <linux/module.h> 23*08bad5a8SMark Brown #include <linux/platform_device.h> 24*08bad5a8SMark Brown #include <linux/err.h> 25*08bad5a8SMark Brown #include <linux/hwmon.h> 26*08bad5a8SMark Brown #include <linux/hwmon-sysfs.h> 27*08bad5a8SMark Brown 28*08bad5a8SMark Brown #include <linux/mfd/wm831x/core.h> 29*08bad5a8SMark Brown #include <linux/mfd/wm831x/auxadc.h> 30*08bad5a8SMark Brown 31*08bad5a8SMark Brown struct wm831x_hwmon { 32*08bad5a8SMark Brown struct wm831x *wm831x; 33*08bad5a8SMark Brown struct device *classdev; 34*08bad5a8SMark Brown }; 35*08bad5a8SMark Brown 36*08bad5a8SMark Brown static ssize_t show_name(struct device *dev, 37*08bad5a8SMark Brown struct device_attribute *attr, char *buf) 38*08bad5a8SMark Brown { 39*08bad5a8SMark Brown return sprintf(buf, "wm831x\n"); 40*08bad5a8SMark Brown } 41*08bad5a8SMark Brown 42*08bad5a8SMark Brown static const char *input_names[] = { 43*08bad5a8SMark Brown [WM831X_AUX_SYSVDD] = "SYSVDD", 44*08bad5a8SMark Brown [WM831X_AUX_USB] = "USB", 45*08bad5a8SMark Brown [WM831X_AUX_BKUP_BATT] = "Backup battery", 46*08bad5a8SMark Brown [WM831X_AUX_BATT] = "Battery", 47*08bad5a8SMark Brown [WM831X_AUX_WALL] = "WALL", 48*08bad5a8SMark Brown [WM831X_AUX_CHIP_TEMP] = "PMIC", 49*08bad5a8SMark Brown [WM831X_AUX_BATT_TEMP] = "Battery", 50*08bad5a8SMark Brown }; 51*08bad5a8SMark Brown 52*08bad5a8SMark Brown 53*08bad5a8SMark Brown static ssize_t show_voltage(struct device *dev, 54*08bad5a8SMark Brown struct device_attribute *attr, char *buf) 55*08bad5a8SMark Brown { 56*08bad5a8SMark Brown struct wm831x_hwmon *hwmon = dev_get_drvdata(dev); 57*08bad5a8SMark Brown int channel = to_sensor_dev_attr(attr)->index; 58*08bad5a8SMark Brown int ret; 59*08bad5a8SMark Brown 60*08bad5a8SMark Brown ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel); 61*08bad5a8SMark Brown if (ret < 0) 62*08bad5a8SMark Brown return ret; 63*08bad5a8SMark Brown 64*08bad5a8SMark Brown return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000)); 65*08bad5a8SMark Brown } 66*08bad5a8SMark Brown 67*08bad5a8SMark Brown static ssize_t show_chip_temp(struct device *dev, 68*08bad5a8SMark Brown struct device_attribute *attr, char *buf) 69*08bad5a8SMark Brown { 70*08bad5a8SMark Brown struct wm831x_hwmon *hwmon = dev_get_drvdata(dev); 71*08bad5a8SMark Brown int channel = to_sensor_dev_attr(attr)->index; 72*08bad5a8SMark Brown int ret; 73*08bad5a8SMark Brown 74*08bad5a8SMark Brown ret = wm831x_auxadc_read(hwmon->wm831x, channel); 75*08bad5a8SMark Brown if (ret < 0) 76*08bad5a8SMark Brown return ret; 77*08bad5a8SMark Brown 78*08bad5a8SMark Brown /* Degrees celsius = (512.18-ret) / 1.0983 */ 79*08bad5a8SMark Brown ret = 512180 - (ret * 1000); 80*08bad5a8SMark Brown ret = DIV_ROUND_CLOSEST(ret * 10000, 10983); 81*08bad5a8SMark Brown 82*08bad5a8SMark Brown return sprintf(buf, "%d\n", ret); 83*08bad5a8SMark Brown } 84*08bad5a8SMark Brown 85*08bad5a8SMark Brown static ssize_t show_label(struct device *dev, 86*08bad5a8SMark Brown struct device_attribute *attr, char *buf) 87*08bad5a8SMark Brown { 88*08bad5a8SMark Brown int channel = to_sensor_dev_attr(attr)->index; 89*08bad5a8SMark Brown 90*08bad5a8SMark Brown return sprintf(buf, "%s\n", input_names[channel]); 91*08bad5a8SMark Brown } 92*08bad5a8SMark Brown 93*08bad5a8SMark Brown #define WM831X_VOLTAGE(id, name) \ 94*08bad5a8SMark Brown static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \ 95*08bad5a8SMark Brown NULL, name) 96*08bad5a8SMark Brown 97*08bad5a8SMark Brown #define WM831X_NAMED_VOLTAGE(id, name) \ 98*08bad5a8SMark Brown WM831X_VOLTAGE(id, name); \ 99*08bad5a8SMark Brown static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ 100*08bad5a8SMark Brown NULL, name) 101*08bad5a8SMark Brown 102*08bad5a8SMark Brown static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 103*08bad5a8SMark Brown 104*08bad5a8SMark Brown WM831X_VOLTAGE(0, WM831X_AUX_AUX1); 105*08bad5a8SMark Brown WM831X_VOLTAGE(1, WM831X_AUX_AUX2); 106*08bad5a8SMark Brown WM831X_VOLTAGE(2, WM831X_AUX_AUX3); 107*08bad5a8SMark Brown WM831X_VOLTAGE(3, WM831X_AUX_AUX4); 108*08bad5a8SMark Brown 109*08bad5a8SMark Brown WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD); 110*08bad5a8SMark Brown WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB); 111*08bad5a8SMark Brown WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT); 112*08bad5a8SMark Brown WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL); 113*08bad5a8SMark Brown WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT); 114*08bad5a8SMark Brown 115*08bad5a8SMark Brown static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL, 116*08bad5a8SMark Brown WM831X_AUX_CHIP_TEMP); 117*08bad5a8SMark Brown static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 118*08bad5a8SMark Brown WM831X_AUX_CHIP_TEMP); 119*08bad5a8SMark Brown /* Report as a voltage since conversion depends on external components 120*08bad5a8SMark Brown * and that's what the ABI wants. */ 121*08bad5a8SMark Brown static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL, 122*08bad5a8SMark Brown WM831X_AUX_BATT_TEMP); 123*08bad5a8SMark Brown static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 124*08bad5a8SMark Brown WM831X_AUX_BATT_TEMP); 125*08bad5a8SMark Brown 126*08bad5a8SMark Brown static struct attribute *wm831x_attributes[] = { 127*08bad5a8SMark Brown &dev_attr_name.attr, 128*08bad5a8SMark Brown 129*08bad5a8SMark Brown &sensor_dev_attr_in0_input.dev_attr.attr, 130*08bad5a8SMark Brown &sensor_dev_attr_in1_input.dev_attr.attr, 131*08bad5a8SMark Brown &sensor_dev_attr_in2_input.dev_attr.attr, 132*08bad5a8SMark Brown &sensor_dev_attr_in3_input.dev_attr.attr, 133*08bad5a8SMark Brown 134*08bad5a8SMark Brown &sensor_dev_attr_in4_input.dev_attr.attr, 135*08bad5a8SMark Brown &sensor_dev_attr_in4_label.dev_attr.attr, 136*08bad5a8SMark Brown &sensor_dev_attr_in5_input.dev_attr.attr, 137*08bad5a8SMark Brown &sensor_dev_attr_in5_label.dev_attr.attr, 138*08bad5a8SMark Brown &sensor_dev_attr_in6_input.dev_attr.attr, 139*08bad5a8SMark Brown &sensor_dev_attr_in6_label.dev_attr.attr, 140*08bad5a8SMark Brown &sensor_dev_attr_in7_input.dev_attr.attr, 141*08bad5a8SMark Brown &sensor_dev_attr_in7_label.dev_attr.attr, 142*08bad5a8SMark Brown &sensor_dev_attr_in8_input.dev_attr.attr, 143*08bad5a8SMark Brown &sensor_dev_attr_in8_label.dev_attr.attr, 144*08bad5a8SMark Brown 145*08bad5a8SMark Brown &sensor_dev_attr_temp1_input.dev_attr.attr, 146*08bad5a8SMark Brown &sensor_dev_attr_temp1_label.dev_attr.attr, 147*08bad5a8SMark Brown &sensor_dev_attr_temp2_input.dev_attr.attr, 148*08bad5a8SMark Brown &sensor_dev_attr_temp2_label.dev_attr.attr, 149*08bad5a8SMark Brown 150*08bad5a8SMark Brown NULL 151*08bad5a8SMark Brown }; 152*08bad5a8SMark Brown 153*08bad5a8SMark Brown static const struct attribute_group wm831x_attr_group = { 154*08bad5a8SMark Brown .attrs = wm831x_attributes, 155*08bad5a8SMark Brown }; 156*08bad5a8SMark Brown 157*08bad5a8SMark Brown static int __devinit wm831x_hwmon_probe(struct platform_device *pdev) 158*08bad5a8SMark Brown { 159*08bad5a8SMark Brown struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 160*08bad5a8SMark Brown struct wm831x_hwmon *hwmon; 161*08bad5a8SMark Brown int ret; 162*08bad5a8SMark Brown 163*08bad5a8SMark Brown hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL); 164*08bad5a8SMark Brown if (!hwmon) 165*08bad5a8SMark Brown return -ENOMEM; 166*08bad5a8SMark Brown 167*08bad5a8SMark Brown hwmon->wm831x = wm831x; 168*08bad5a8SMark Brown 169*08bad5a8SMark Brown ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group); 170*08bad5a8SMark Brown if (ret) 171*08bad5a8SMark Brown goto err; 172*08bad5a8SMark Brown 173*08bad5a8SMark Brown hwmon->classdev = hwmon_device_register(&pdev->dev); 174*08bad5a8SMark Brown if (IS_ERR(hwmon->classdev)) { 175*08bad5a8SMark Brown ret = PTR_ERR(hwmon->classdev); 176*08bad5a8SMark Brown goto err_sysfs; 177*08bad5a8SMark Brown } 178*08bad5a8SMark Brown 179*08bad5a8SMark Brown platform_set_drvdata(pdev, hwmon); 180*08bad5a8SMark Brown 181*08bad5a8SMark Brown return 0; 182*08bad5a8SMark Brown 183*08bad5a8SMark Brown err_sysfs: 184*08bad5a8SMark Brown sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); 185*08bad5a8SMark Brown err: 186*08bad5a8SMark Brown kfree(hwmon); 187*08bad5a8SMark Brown return ret; 188*08bad5a8SMark Brown } 189*08bad5a8SMark Brown 190*08bad5a8SMark Brown static int __devexit wm831x_hwmon_remove(struct platform_device *pdev) 191*08bad5a8SMark Brown { 192*08bad5a8SMark Brown struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev); 193*08bad5a8SMark Brown 194*08bad5a8SMark Brown hwmon_device_unregister(hwmon->classdev); 195*08bad5a8SMark Brown sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); 196*08bad5a8SMark Brown platform_set_drvdata(pdev, NULL); 197*08bad5a8SMark Brown kfree(hwmon); 198*08bad5a8SMark Brown 199*08bad5a8SMark Brown return 0; 200*08bad5a8SMark Brown } 201*08bad5a8SMark Brown 202*08bad5a8SMark Brown static struct platform_driver wm831x_hwmon_driver = { 203*08bad5a8SMark Brown .probe = wm831x_hwmon_probe, 204*08bad5a8SMark Brown .remove = __devexit_p(wm831x_hwmon_remove), 205*08bad5a8SMark Brown .driver = { 206*08bad5a8SMark Brown .name = "wm831x-hwmon", 207*08bad5a8SMark Brown .owner = THIS_MODULE, 208*08bad5a8SMark Brown }, 209*08bad5a8SMark Brown }; 210*08bad5a8SMark Brown 211*08bad5a8SMark Brown static int __init wm831x_hwmon_init(void) 212*08bad5a8SMark Brown { 213*08bad5a8SMark Brown return platform_driver_register(&wm831x_hwmon_driver); 214*08bad5a8SMark Brown } 215*08bad5a8SMark Brown module_init(wm831x_hwmon_init); 216*08bad5a8SMark Brown 217*08bad5a8SMark Brown static void __exit wm831x_hwmon_exit(void) 218*08bad5a8SMark Brown { 219*08bad5a8SMark Brown platform_driver_unregister(&wm831x_hwmon_driver); 220*08bad5a8SMark Brown } 221*08bad5a8SMark Brown module_exit(wm831x_hwmon_exit); 222*08bad5a8SMark Brown 223*08bad5a8SMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 224*08bad5a8SMark Brown MODULE_DESCRIPTION("WM831x Hardware Monitoring"); 225*08bad5a8SMark Brown MODULE_LICENSE("GPL"); 226*08bad5a8SMark Brown MODULE_ALIAS("platform:wm831x-hwmon"); 227