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/*
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/kdev_t.h>
#include <linux/idr.h>
#include <linux/hwmon.h>
#include <linux/gfp.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
static struct class *hwmon_class;
static DEFINE_IDA(hwmon_ida);
/**
* 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)
{
struct device *hwdev;
int id;
id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
if (id < 0)
return ERR_PTR(id);
hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
HWMON_ID_FORMAT, id);
if (IS_ERR(hwdev))
ida_simple_remove(&hwmon_ida, id);
return hwdev;
}
/**
* 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");
}
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 &&
(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));
}
}
#endif
}
static int __init hwmon_init(void)
{
hwmon_pci_quirks();
hwmon_class = class_create(THIS_MODULE, "hwmon");
if (IS_ERR(hwmon_class)) {
pr_err("couldn't create sysfs class\n");
return PTR_ERR(hwmon_class);
}
return 0;
}
static void __exit hwmon_exit(void)
{
class_destroy(hwmon_class);
}
subsys_initcall(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");
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