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fb6c023a2b
This driver provides reporting of the status supply voltage rails of the WM835x series of PMICs via the hwmon API. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
152 lines
4.0 KiB
C
152 lines
4.0 KiB
C
/*
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* drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 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/err.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/mfd/wm8350/comparator.h>
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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, "wm8350\n");
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}
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static const char *input_names[] = {
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[WM8350_AUXADC_USB] = "USB",
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[WM8350_AUXADC_LINE] = "Line",
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[WM8350_AUXADC_BATT] = "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 wm8350 *wm8350 = dev_get_drvdata(dev);
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int channel = to_sensor_dev_attr(attr)->index;
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int val;
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val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF;
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val = DIV_ROUND_CLOSEST(val, 1000);
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return sprintf(buf, "%d\n", val);
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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 WM8350_NAMED_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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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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WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
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WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
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WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
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static struct attribute *wm8350_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_in0_label.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_label.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in2_label.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group wm8350_attr_group = {
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.attrs = wm8350_attributes,
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};
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static int __devinit wm8350_hwmon_probe(struct platform_device *pdev)
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{
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struct wm8350 *wm8350 = platform_get_drvdata(pdev);
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int ret;
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ret = sysfs_create_group(&pdev->dev.kobj, &wm8350_attr_group);
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if (ret)
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goto err;
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wm8350->hwmon.classdev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(wm8350->hwmon.classdev)) {
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ret = PTR_ERR(wm8350->hwmon.classdev);
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goto err_group;
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}
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return 0;
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err_group:
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sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group);
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err:
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return ret;
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}
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static int __devexit wm8350_hwmon_remove(struct platform_device *pdev)
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{
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struct wm8350 *wm8350 = platform_get_drvdata(pdev);
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hwmon_device_unregister(wm8350->hwmon.classdev);
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sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group);
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return 0;
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}
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static struct platform_driver wm8350_hwmon_driver = {
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.probe = wm8350_hwmon_probe,
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.remove = __devexit_p(wm8350_hwmon_remove),
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.driver = {
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.name = "wm8350-hwmon",
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.owner = THIS_MODULE,
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},
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};
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static int __init wm8350_hwmon_init(void)
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{
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return platform_driver_register(&wm8350_hwmon_driver);
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}
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module_init(wm8350_hwmon_init);
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static void __exit wm8350_hwmon_exit(void)
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{
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platform_driver_unregister(&wm8350_hwmon_driver);
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}
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module_exit(wm8350_hwmon_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8350-hwmon");
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