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227 lines
6.2 KiB
227 lines
6.2 KiB
/*
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* drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
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* hardware monitoring features.
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*
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* Copyright (C) 2009 Wolfson Microelectronics plc
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License v2 as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/slab.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/auxadc.h>
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struct wm831x_hwmon {
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struct wm831x *wm831x;
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struct device *classdev;
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};
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static ssize_t show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "wm831x\n");
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}
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static const char *input_names[] = {
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[WM831X_AUX_SYSVDD] = "SYSVDD",
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[WM831X_AUX_USB] = "USB",
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[WM831X_AUX_BKUP_BATT] = "Backup battery",
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[WM831X_AUX_BATT] = "Battery",
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[WM831X_AUX_WALL] = "WALL",
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[WM831X_AUX_CHIP_TEMP] = "PMIC",
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[WM831X_AUX_BATT_TEMP] = "Battery",
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};
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static ssize_t show_voltage(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
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int channel = to_sensor_dev_attr(attr)->index;
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int ret;
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ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
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}
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static ssize_t show_chip_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
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int channel = to_sensor_dev_attr(attr)->index;
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int ret;
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ret = wm831x_auxadc_read(hwmon->wm831x, channel);
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if (ret < 0)
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return ret;
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/* Degrees celsius = (512.18-ret) / 1.0983 */
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ret = 512180 - (ret * 1000);
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ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
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return sprintf(buf, "%d\n", ret);
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}
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static ssize_t show_label(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int channel = to_sensor_dev_attr(attr)->index;
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return sprintf(buf, "%s\n", input_names[channel]);
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}
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#define WM831X_VOLTAGE(id, name) \
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static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
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NULL, name)
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#define WM831X_NAMED_VOLTAGE(id, name) \
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WM831X_VOLTAGE(id, name); \
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static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
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NULL, name)
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
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WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
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WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
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WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
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WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
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WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
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WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
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WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
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WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
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WM831X_AUX_CHIP_TEMP);
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static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
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WM831X_AUX_CHIP_TEMP);
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/* Report as a voltage since conversion depends on external components
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* and that's what the ABI wants. */
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
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WM831X_AUX_BATT_TEMP);
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static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
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WM831X_AUX_BATT_TEMP);
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static struct attribute *wm831x_attributes[] = {
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&dev_attr_name.attr,
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in4_label.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in5_label.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_in6_label.dev_attr.attr,
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&sensor_dev_attr_in7_input.dev_attr.attr,
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&sensor_dev_attr_in7_label.dev_attr.attr,
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&sensor_dev_attr_in8_input.dev_attr.attr,
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&sensor_dev_attr_in8_label.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_label.dev_attr.attr,
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NULL
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};
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static const struct attribute_group wm831x_attr_group = {
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.attrs = wm831x_attributes,
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};
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static int __devinit wm831x_hwmon_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_hwmon *hwmon;
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int ret;
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hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL);
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if (!hwmon)
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return -ENOMEM;
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hwmon->wm831x = wm831x;
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ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group);
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if (ret)
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goto err;
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hwmon->classdev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(hwmon->classdev)) {
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ret = PTR_ERR(hwmon->classdev);
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goto err_sysfs;
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}
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platform_set_drvdata(pdev, hwmon);
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return 0;
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err_sysfs:
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sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
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err:
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kfree(hwmon);
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return ret;
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}
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static int __devexit wm831x_hwmon_remove(struct platform_device *pdev)
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{
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struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev);
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hwmon_device_unregister(hwmon->classdev);
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sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
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platform_set_drvdata(pdev, NULL);
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kfree(hwmon);
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return 0;
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}
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static struct platform_driver wm831x_hwmon_driver = {
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.probe = wm831x_hwmon_probe,
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.remove = __devexit_p(wm831x_hwmon_remove),
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.driver = {
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.name = "wm831x-hwmon",
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.owner = THIS_MODULE,
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},
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};
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static int __init wm831x_hwmon_init(void)
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{
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return platform_driver_register(&wm831x_hwmon_driver);
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}
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module_init(wm831x_hwmon_init);
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static void __exit wm831x_hwmon_exit(void)
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{
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platform_driver_unregister(&wm831x_hwmon_driver);
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}
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module_exit(wm831x_hwmon_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM831x Hardware Monitoring");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-hwmon");
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