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153 lines
4.4 KiB
153 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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#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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static const char * const 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 *wm831x = 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(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 *wm831x = 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(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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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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/* |
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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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*/ |
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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_attrs[] = { |
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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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ATTRIBUTE_GROUPS(wm831x); |
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static int 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 device *hwmon_dev; |
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hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x", |
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wm831x, |
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wm831x_groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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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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.driver = { |
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.name = "wm831x-hwmon", |
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}, |
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}; |
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module_platform_driver(wm831x_hwmon_driver); |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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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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