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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | /* * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x 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/platform_device.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/slab.h> #include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/auxadc.h> static const char * const input_names[] = { [WM831X_AUX_SYSVDD] = "SYSVDD", [WM831X_AUX_USB] = "USB", [WM831X_AUX_BKUP_BATT] = "Backup battery", [WM831X_AUX_BATT] = "Battery", [WM831X_AUX_WALL] = "WALL", [WM831X_AUX_CHIP_TEMP] = "PMIC", [WM831X_AUX_BATT_TEMP] = "Battery", }; static ssize_t show_voltage(struct device *dev, struct device_attribute *attr, char *buf) { struct wm831x *wm831x = dev_get_drvdata(dev); int channel = to_sensor_dev_attr(attr)->index; int ret; ret = wm831x_auxadc_read_uv(wm831x, channel); if (ret < 0) return ret; return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000)); } static ssize_t show_chip_temp(struct device *dev, struct device_attribute *attr, char *buf) { struct wm831x *wm831x = dev_get_drvdata(dev); int channel = to_sensor_dev_attr(attr)->index; int ret; ret = wm831x_auxadc_read(wm831x, channel); if (ret < 0) return ret; /* Degrees celsius = (512.18-ret) / 1.0983 */ ret = 512180 - (ret * 1000); ret = DIV_ROUND_CLOSEST(ret * 10000, 10983); return sprintf(buf, "%d\n", ret); } 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 WM831X_VOLTAGE(id, name) \ static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \ NULL, name) #define WM831X_NAMED_VOLTAGE(id, name) \ WM831X_VOLTAGE(id, name); \ static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ NULL, name) WM831X_VOLTAGE(0, WM831X_AUX_AUX1); WM831X_VOLTAGE(1, WM831X_AUX_AUX2); WM831X_VOLTAGE(2, WM831X_AUX_AUX3); WM831X_VOLTAGE(3, WM831X_AUX_AUX4); WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD); WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB); WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT); WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL); WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT); static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL, WM831X_AUX_CHIP_TEMP); static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, WM831X_AUX_CHIP_TEMP); /* * Report as a voltage since conversion depends on external components * and that's what the ABI wants. */ static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL, WM831X_AUX_BATT_TEMP); static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, WM831X_AUX_BATT_TEMP); static struct attribute *wm831x_attrs[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in4_label.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in5_label.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, &sensor_dev_attr_in6_label.dev_attr.attr, &sensor_dev_attr_in7_input.dev_attr.attr, &sensor_dev_attr_in7_label.dev_attr.attr, &sensor_dev_attr_in8_input.dev_attr.attr, &sensor_dev_attr_in8_label.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_label.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp2_label.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(wm831x); static int wm831x_hwmon_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct device *hwmon_dev; hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x", wm831x, wm831x_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static struct platform_driver wm831x_hwmon_driver = { .probe = wm831x_hwmon_probe, .driver = { .name = "wm831x-hwmon", }, }; module_platform_driver(wm831x_hwmon_driver); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("WM831x Hardware Monitoring"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm831x-hwmon"); |