288 lines
6.8 KiB
C
288 lines
6.8 KiB
C
/*
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* hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
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*
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* This file defines the sysfs class "hwmon", for use by sensors drivers.
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*
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* Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/kdev_t.h>
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#include <linux/idr.h>
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#include <linux/hwmon.h>
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#include <linux/gfp.h>
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#include <linux/spinlock.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#define HWMON_ID_PREFIX "hwmon"
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#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
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struct hwmon_device {
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const char *name;
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struct device dev;
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};
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#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
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static ssize_t
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show_name(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
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}
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static struct attribute *hwmon_dev_attrs[] = {
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&dev_attr_name.attr,
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NULL
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};
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static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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if (to_hwmon_device(dev)->name == NULL)
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return 0;
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return attr->mode;
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}
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static struct attribute_group hwmon_dev_attr_group = {
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.attrs = hwmon_dev_attrs,
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.is_visible = hwmon_dev_name_is_visible,
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};
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static const struct attribute_group *hwmon_dev_attr_groups[] = {
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&hwmon_dev_attr_group,
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NULL
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};
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static void hwmon_dev_release(struct device *dev)
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{
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kfree(to_hwmon_device(dev));
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}
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static struct class hwmon_class = {
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.name = "hwmon",
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.owner = THIS_MODULE,
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.dev_groups = hwmon_dev_attr_groups,
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.dev_release = hwmon_dev_release,
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};
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static DEFINE_IDA(hwmon_ida);
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/**
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* hwmon_device_register_with_groups - register w/ hwmon
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* @dev: the parent device
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* @name: hwmon name attribute
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* @drvdata: driver data to attach to created device
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* @groups: List of attribute groups to create
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*
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* hwmon_device_unregister() must be called when the device is no
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* longer needed.
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*
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* Returns the pointer to the new device.
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*/
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struct device *
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hwmon_device_register_with_groups(struct device *dev, const char *name,
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void *drvdata,
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const struct attribute_group **groups)
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{
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struct hwmon_device *hwdev;
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int err, id;
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/* Do not accept invalid characters in hwmon name attribute */
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if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
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return ERR_PTR(-EINVAL);
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id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
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if (id < 0)
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return ERR_PTR(id);
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hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
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if (hwdev == NULL) {
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err = -ENOMEM;
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goto ida_remove;
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}
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hwdev->name = name;
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hwdev->dev.class = &hwmon_class;
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hwdev->dev.parent = dev;
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hwdev->dev.groups = groups;
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hwdev->dev.of_node = dev ? dev->of_node : NULL;
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dev_set_drvdata(&hwdev->dev, drvdata);
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dev_set_name(&hwdev->dev, HWMON_ID_FORMAT, id);
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err = device_register(&hwdev->dev);
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if (err)
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goto free;
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return &hwdev->dev;
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free:
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kfree(hwdev);
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ida_remove:
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ida_simple_remove(&hwmon_ida, id);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
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/**
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* hwmon_device_register - register w/ hwmon
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* @dev: the device to register
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*
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* hwmon_device_unregister() must be called when the device is no
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* longer needed.
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*
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* Returns the pointer to the new device.
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*/
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struct device *hwmon_device_register(struct device *dev)
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{
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return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(hwmon_device_register);
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/**
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* hwmon_device_unregister - removes the previously registered class device
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*
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* @dev: the class device to destroy
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*/
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void hwmon_device_unregister(struct device *dev)
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{
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int id;
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if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
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device_unregister(dev);
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ida_simple_remove(&hwmon_ida, id);
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} else
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dev_dbg(dev->parent,
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"hwmon_device_unregister() failed: bad class ID!\n");
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}
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EXPORT_SYMBOL_GPL(hwmon_device_unregister);
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static void devm_hwmon_release(struct device *dev, void *res)
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{
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struct device *hwdev = *(struct device **)res;
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hwmon_device_unregister(hwdev);
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}
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/**
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* devm_hwmon_device_register_with_groups - register w/ hwmon
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* @dev: the parent device
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* @name: hwmon name attribute
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* @drvdata: driver data to attach to created device
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* @groups: List of attribute groups to create
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*
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* Returns the pointer to the new device. The new device is automatically
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* unregistered with the parent device.
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*/
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struct device *
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devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
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void *drvdata,
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const struct attribute_group **groups)
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{
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struct device **ptr, *hwdev;
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if (!dev)
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return ERR_PTR(-EINVAL);
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ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
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if (IS_ERR(hwdev))
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goto error;
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*ptr = hwdev;
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devres_add(dev, ptr);
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return hwdev;
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error:
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devres_free(ptr);
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return hwdev;
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}
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EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
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static int devm_hwmon_match(struct device *dev, void *res, void *data)
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{
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struct device **hwdev = res;
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return *hwdev == data;
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}
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/**
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* devm_hwmon_device_unregister - removes a previously registered hwmon device
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*
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* @dev: the parent device of the device to unregister
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*/
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void devm_hwmon_device_unregister(struct device *dev)
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{
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WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
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}
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EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
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static void __init hwmon_pci_quirks(void)
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{
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#if defined CONFIG_X86 && defined CONFIG_PCI
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struct pci_dev *sb;
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u16 base;
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u8 enable;
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/* Open access to 0x295-0x296 on MSI MS-7031 */
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sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
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if (sb) {
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if (sb->subsystem_vendor == 0x1462 && /* MSI */
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sb->subsystem_device == 0x0031) { /* MS-7031 */
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pci_read_config_byte(sb, 0x48, &enable);
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pci_read_config_word(sb, 0x64, &base);
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if (base == 0 && !(enable & BIT(2))) {
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dev_info(&sb->dev,
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"Opening wide generic port at 0x295\n");
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pci_write_config_word(sb, 0x64, 0x295);
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pci_write_config_byte(sb, 0x48,
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enable | BIT(2));
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}
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}
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pci_dev_put(sb);
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}
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#endif
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}
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static int __init hwmon_init(void)
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{
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int err;
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hwmon_pci_quirks();
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err = class_register(&hwmon_class);
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if (err) {
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pr_err("couldn't register hwmon sysfs class\n");
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return err;
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}
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return 0;
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}
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static void __exit hwmon_exit(void)
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{
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class_unregister(&hwmon_class);
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}
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subsys_initcall(hwmon_init);
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module_exit(hwmon_exit);
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MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
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MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
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MODULE_LICENSE("GPL");
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