/* * 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> struct wm831x_hwmon { struct wm831x *wm831x; struct device *classdev; }; static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "wm831x\n"); } 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_hwmon *hwmon = dev_get_drvdata(dev); int channel = to_sensor_dev_attr(attr)->index; int ret; ret = wm831x_auxadc_read_uv(hwmon->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_hwmon *hwmon = dev_get_drvdata(dev); int channel = to_sensor_dev_attr(attr)->index; int ret; ret = wm831x_auxadc_read(hwmon->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) static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 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_attributes[] = { &dev_attr_name.attr, &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 }; static const struct attribute_group wm831x_attr_group = { .attrs = wm831x_attributes, }; static int __devinit wm831x_hwmon_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_hwmon *hwmon; int ret; hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL); if (!hwmon) return -ENOMEM; hwmon->wm831x = wm831x; ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group); if (ret) goto err; hwmon->classdev = hwmon_device_register(&pdev->dev); if (IS_ERR(hwmon->classdev)) { ret = PTR_ERR(hwmon->classdev); goto err_sysfs; } platform_set_drvdata(pdev, hwmon); return 0; err_sysfs: sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); err: kfree(hwmon); return ret; } static int __devexit wm831x_hwmon_remove(struct platform_device *pdev) { struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev); hwmon_device_unregister(hwmon->classdev); sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); platform_set_drvdata(pdev, NULL); kfree(hwmon); return 0; } static struct platform_driver wm831x_hwmon_driver = { .probe = wm831x_hwmon_probe, .remove = __devexit_p(wm831x_hwmon_remove), .driver = { .name = "wm831x-hwmon", .owner = THIS_MODULE, }, }; 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");