mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
648cd48c9e
hwmon name attributes must not include '-', as specified in Documentation/hwmon/sysfs-interface. Also filter out spaces, tabs, wildcards, and newline characters. Tested-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
288 lines
6.8 KiB
C
288 lines
6.8 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/string.h>
|
|
|
|
#define HWMON_ID_PREFIX "hwmon"
|
|
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
|
|
|
|
struct hwmon_device {
|
|
const char *name;
|
|
struct device dev;
|
|
};
|
|
#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
|
|
|
|
static ssize_t
|
|
show_name(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
|
|
}
|
|
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
|
|
|
|
static struct attribute *hwmon_dev_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
NULL
|
|
};
|
|
|
|
static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
|
|
if (to_hwmon_device(dev)->name == NULL)
|
|
return 0;
|
|
|
|
return attr->mode;
|
|
}
|
|
|
|
static struct attribute_group hwmon_dev_attr_group = {
|
|
.attrs = hwmon_dev_attrs,
|
|
.is_visible = hwmon_dev_name_is_visible,
|
|
};
|
|
|
|
static const struct attribute_group *hwmon_dev_attr_groups[] = {
|
|
&hwmon_dev_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static void hwmon_dev_release(struct device *dev)
|
|
{
|
|
kfree(to_hwmon_device(dev));
|
|
}
|
|
|
|
static struct class hwmon_class = {
|
|
.name = "hwmon",
|
|
.owner = THIS_MODULE,
|
|
.dev_groups = hwmon_dev_attr_groups,
|
|
.dev_release = hwmon_dev_release,
|
|
};
|
|
|
|
static DEFINE_IDA(hwmon_ida);
|
|
|
|
/**
|
|
* hwmon_device_register_with_groups - register w/ hwmon
|
|
* @dev: the parent device
|
|
* @name: hwmon name attribute
|
|
* @drvdata: driver data to attach to created device
|
|
* @groups: List of attribute groups to create
|
|
*
|
|
* hwmon_device_unregister() must be called when the device is no
|
|
* longer needed.
|
|
*
|
|
* Returns the pointer to the new device.
|
|
*/
|
|
struct device *
|
|
hwmon_device_register_with_groups(struct device *dev, const char *name,
|
|
void *drvdata,
|
|
const struct attribute_group **groups)
|
|
{
|
|
struct hwmon_device *hwdev;
|
|
int err, id;
|
|
|
|
/* Do not accept invalid characters in hwmon name attribute */
|
|
if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
|
|
if (id < 0)
|
|
return ERR_PTR(id);
|
|
|
|
hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
|
|
if (hwdev == NULL) {
|
|
err = -ENOMEM;
|
|
goto ida_remove;
|
|
}
|
|
|
|
hwdev->name = name;
|
|
hwdev->dev.class = &hwmon_class;
|
|
hwdev->dev.parent = dev;
|
|
hwdev->dev.groups = groups;
|
|
hwdev->dev.of_node = dev ? dev->of_node : NULL;
|
|
dev_set_drvdata(&hwdev->dev, drvdata);
|
|
dev_set_name(&hwdev->dev, HWMON_ID_FORMAT, id);
|
|
err = device_register(&hwdev->dev);
|
|
if (err)
|
|
goto free;
|
|
|
|
return &hwdev->dev;
|
|
|
|
free:
|
|
kfree(hwdev);
|
|
ida_remove:
|
|
ida_simple_remove(&hwmon_ida, id);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
|
|
|
|
/**
|
|
* hwmon_device_register - register w/ hwmon
|
|
* @dev: the device to register
|
|
*
|
|
* hwmon_device_unregister() must be called when the device is no
|
|
* longer needed.
|
|
*
|
|
* Returns the pointer to the new device.
|
|
*/
|
|
struct device *hwmon_device_register(struct device *dev)
|
|
{
|
|
return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hwmon_device_register);
|
|
|
|
/**
|
|
* hwmon_device_unregister - removes the previously registered class device
|
|
*
|
|
* @dev: the class device to destroy
|
|
*/
|
|
void hwmon_device_unregister(struct device *dev)
|
|
{
|
|
int id;
|
|
|
|
if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
|
|
device_unregister(dev);
|
|
ida_simple_remove(&hwmon_ida, id);
|
|
} else
|
|
dev_dbg(dev->parent,
|
|
"hwmon_device_unregister() failed: bad class ID!\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(hwmon_device_unregister);
|
|
|
|
static void devm_hwmon_release(struct device *dev, void *res)
|
|
{
|
|
struct device *hwdev = *(struct device **)res;
|
|
|
|
hwmon_device_unregister(hwdev);
|
|
}
|
|
|
|
/**
|
|
* devm_hwmon_device_register_with_groups - register w/ hwmon
|
|
* @dev: the parent device
|
|
* @name: hwmon name attribute
|
|
* @drvdata: driver data to attach to created device
|
|
* @groups: List of attribute groups to create
|
|
*
|
|
* Returns the pointer to the new device. The new device is automatically
|
|
* unregistered with the parent device.
|
|
*/
|
|
struct device *
|
|
devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
|
|
void *drvdata,
|
|
const struct attribute_group **groups)
|
|
{
|
|
struct device **ptr, *hwdev;
|
|
|
|
if (!dev)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
|
|
if (IS_ERR(hwdev))
|
|
goto error;
|
|
|
|
*ptr = hwdev;
|
|
devres_add(dev, ptr);
|
|
return hwdev;
|
|
|
|
error:
|
|
devres_free(ptr);
|
|
return hwdev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
|
|
|
|
static int devm_hwmon_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct device **hwdev = res;
|
|
|
|
return *hwdev == data;
|
|
}
|
|
|
|
/**
|
|
* devm_hwmon_device_unregister - removes a previously registered hwmon device
|
|
*
|
|
* @dev: the parent device of the device to unregister
|
|
*/
|
|
void devm_hwmon_device_unregister(struct device *dev)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
|
|
|
|
static void __init hwmon_pci_quirks(void)
|
|
{
|
|
#if defined CONFIG_X86 && defined CONFIG_PCI
|
|
struct pci_dev *sb;
|
|
u16 base;
|
|
u8 enable;
|
|
|
|
/* Open access to 0x295-0x296 on MSI MS-7031 */
|
|
sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
|
|
if (sb) {
|
|
if (sb->subsystem_vendor == 0x1462 && /* MSI */
|
|
sb->subsystem_device == 0x0031) { /* MS-7031 */
|
|
pci_read_config_byte(sb, 0x48, &enable);
|
|
pci_read_config_word(sb, 0x64, &base);
|
|
|
|
if (base == 0 && !(enable & BIT(2))) {
|
|
dev_info(&sb->dev,
|
|
"Opening wide generic port at 0x295\n");
|
|
pci_write_config_word(sb, 0x64, 0x295);
|
|
pci_write_config_byte(sb, 0x48,
|
|
enable | BIT(2));
|
|
}
|
|
}
|
|
pci_dev_put(sb);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int __init hwmon_init(void)
|
|
{
|
|
int err;
|
|
|
|
hwmon_pci_quirks();
|
|
|
|
err = class_register(&hwmon_class);
|
|
if (err) {
|
|
pr_err("couldn't register hwmon sysfs class\n");
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit hwmon_exit(void)
|
|
{
|
|
class_unregister(&hwmon_class);
|
|
}
|
|
|
|
subsys_initcall(hwmon_init);
|
|
module_exit(hwmon_exit);
|
|
|
|
MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
|
|
MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
|
|
MODULE_LICENSE("GPL");
|
|
|