145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/*
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hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
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This file defines the sysfs class "hwmon", for use by sensors drivers.
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Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
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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/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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#define HWMON_ID_PREFIX "hwmon"
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#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
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static struct class *hwmon_class;
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static DEFINE_IDR(hwmon_idr);
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static DEFINE_SPINLOCK(idr_lock);
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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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struct device *hwdev;
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int id, err;
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again:
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if (unlikely(idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0))
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return ERR_PTR(-ENOMEM);
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spin_lock(&idr_lock);
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err = idr_get_new(&hwmon_idr, NULL, &id);
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spin_unlock(&idr_lock);
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if (unlikely(err == -EAGAIN))
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goto again;
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else if (unlikely(err))
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return ERR_PTR(err);
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id = id & MAX_ID_MASK;
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hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
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HWMON_ID_FORMAT, id);
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if (IS_ERR(hwdev)) {
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spin_lock(&idr_lock);
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idr_remove(&hwmon_idr, id);
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spin_unlock(&idr_lock);
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}
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return hwdev;
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}
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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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spin_lock(&idr_lock);
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idr_remove(&hwmon_idr, id);
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spin_unlock(&idr_lock);
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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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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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(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, enable | BIT(2));
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}
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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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hwmon_pci_quirks();
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hwmon_class = class_create(THIS_MODULE, "hwmon");
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if (IS_ERR(hwmon_class)) {
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pr_err("couldn't create sysfs class\n");
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return PTR_ERR(hwmon_class);
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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_destroy(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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EXPORT_SYMBOL_GPL(hwmon_device_register);
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EXPORT_SYMBOL_GPL(hwmon_device_unregister);
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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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