[PATCH] I2C hwmon: hwmon sysfs class (1236441f) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/hwmon/Kconfig

+6 −1

Original line number	Diff line number	Diff line
		@@ -12,7 +12,12 @@ config HWMON
		of a system. Most modern motherboards include such a device. It
		can include temperature sensors, voltage sensors, fan speed
		sensors and various additional features such as the ability to
		control the speed of the fans.
		control the speed of the fans. If you want this support you
		should say Y here and also to the specific driver(s) for your
		sensors chip(s) below.

		This support can also be built as a module. If so, the module
		will be called hwmon.

		config SENSORS_ADM1021
		tristate "Analog Devices ADM1021 and compatibles"

drivers/hwmon/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -2,6 +2,8 @@
		# Makefile for sensor chip drivers.
		#

		obj-$(CONFIG_HWMON) += hwmon.o

		# asb100, then w83781d go first, as they can override other drivers' addresses.
		obj-$(CONFIG_SENSORS_ASB100) += asb100.o
		obj-$(CONFIG_SENSORS_W83627HF) += w83627hf.o

drivers/hwmon/hwmon.c

0 → 100644

+98 −0

Original line number	Diff line number	Diff line
		/*
		hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring

		This file defines the sysfs class "hwmon", for use by sensors drivers.

		Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>

		This program is free software; you can redistribute it and/or modify
		it under the terms of the GNU General Public License as published by
		the Free Software Foundation; version 2 of the License.
		*/

		#include <linux/module.h>
		#include <linux/device.h>
		#include <linux/err.h>
		#include <linux/kdev_t.h>
		#include <linux/idr.h>
		#include <linux/hwmon.h>

		#define HWMON_ID_PREFIX "hwmon"
		#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"

		static struct class *hwmon_class;

		static DEFINE_IDR(hwmon_idr);

		/**
		* hwmon_device_register - register w/ hwmon sysfs class
		* @dev: the device to register
		*
		* hwmon_device_unregister() must be called when the class device is no
		* longer needed.
		*
		* Returns the pointer to the new struct class device.
		*/
		struct class_device hwmon_device_register(struct device dev)
		{
		struct class_device *cdev;
		int id;

		if (idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0)
		return ERR_PTR(-ENOMEM);

		if (idr_get_new(&hwmon_idr, NULL, &id) < 0)
		return ERR_PTR(-ENOMEM);

		id = id & MAX_ID_MASK;
		cdev = class_device_create(hwmon_class, MKDEV(0,0), dev,
		HWMON_ID_FORMAT, id);

		if (IS_ERR(cdev))
		idr_remove(&hwmon_idr, id);

		return cdev;
		}

		/**
		* hwmon_device_unregister - removes the previously registered class device
		*
		* @cdev: the class device to destroy
		*/
		void hwmon_device_unregister(struct class_device *cdev)
		{
		int id;

		if (sscanf(cdev->class_id, HWMON_ID_FORMAT, &id) == 1) {
		class_device_unregister(cdev);
		idr_remove(&hwmon_idr, id);
		} else
		dev_dbg(cdev->dev,
		"hwmon_device_unregister() failed: bad class ID!\n");
		}

		static int __init hwmon_init(void)
		{
		hwmon_class = class_create(THIS_MODULE, "hwmon");
		if (IS_ERR(hwmon_class)) {
		printk(KERN_ERR "hwmon.c: couldn't create sysfs class\n");
		return PTR_ERR(hwmon_class);
		}
		return 0;
		}

		static void __exit hwmon_exit(void)
		{
		class_destroy(hwmon_class);
		}

		module_init(hwmon_init);
		module_exit(hwmon_exit);

		EXPORT_SYMBOL_GPL(hwmon_device_register);
		EXPORT_SYMBOL_GPL(hwmon_device_unregister);

		MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
		MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
		MODULE_LICENSE("GPL");

include/linux/hwmon.h

0 → 100644

+24 −0

Original line number	Diff line number	Diff line
		/*
		hwmon.h - part of lm_sensors, Linux kernel modules for hardware monitoring

		This file declares helper functions for the sysfs class "hwmon",
		for use by sensors drivers.

		Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>

		This program is free software; you can redistribute it and/or modify
		it under the terms of the GNU General Public License as published by
		the Free Software Foundation; version 2 of the License.
		*/

		#ifndef _HWMON_H_
		#define _HWMON_H_

		#include <linux/device.h>

		struct class_device hwmon_device_register(struct device dev);

		void hwmon_device_unregister(struct class_device *cdev);

		#endif