2 hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
4 This file defines the sysfs class "hwmon", for use by sensors drivers.
6 Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; version 2 of the License.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/err.h>
18 #include <linux/kdev_t.h>
19 #include <linux/idr.h>
20 #include <linux/hwmon.h>
21 #include <linux/gfp.h>
22 #include <linux/spinlock.h>
23 #include <linux/pci.h>
25 #define HWMON_ID_PREFIX "hwmon"
26 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
28 static struct class *hwmon_class
;
30 static DEFINE_IDR(hwmon_idr
);
31 static DEFINE_SPINLOCK(idr_lock
);
34 * hwmon_device_register - register w/ hwmon
35 * @dev: the device to register
37 * hwmon_device_unregister() must be called when the device is no
40 * Returns the pointer to the new device.
42 struct device
*hwmon_device_register(struct device
*dev
)
48 if (unlikely(idr_pre_get(&hwmon_idr
, GFP_KERNEL
) == 0))
49 return ERR_PTR(-ENOMEM
);
52 err
= idr_get_new(&hwmon_idr
, NULL
, &id
);
53 spin_unlock(&idr_lock
);
55 if (unlikely(err
== -EAGAIN
))
57 else if (unlikely(err
))
60 id
= id
& MAX_ID_MASK
;
61 hwdev
= device_create(hwmon_class
, dev
, MKDEV(0, 0), NULL
,
66 idr_remove(&hwmon_idr
, id
);
67 spin_unlock(&idr_lock
);
74 * hwmon_device_unregister - removes the previously registered class device
76 * @dev: the class device to destroy
78 void hwmon_device_unregister(struct device
*dev
)
82 if (likely(sscanf(dev_name(dev
), HWMON_ID_FORMAT
, &id
) == 1)) {
83 device_unregister(dev
);
85 idr_remove(&hwmon_idr
, id
);
86 spin_unlock(&idr_lock
);
89 "hwmon_device_unregister() failed: bad class ID!\n");
92 static void __init
hwmon_pci_quirks(void)
94 #if defined CONFIG_X86 && defined CONFIG_PCI
99 /* Open access to 0x295-0x296 on MSI MS-7031 */
100 sb
= pci_get_device(PCI_VENDOR_ID_ATI
, 0x436c, NULL
);
102 (sb
->subsystem_vendor
== 0x1462 && /* MSI */
103 sb
->subsystem_device
== 0x0031)) { /* MS-7031 */
105 pci_read_config_byte(sb
, 0x48, &enable
);
106 pci_read_config_word(sb
, 0x64, &base
);
108 if (base
== 0 && !(enable
& BIT(2))) {
110 "Opening wide generic port at 0x295\n");
111 pci_write_config_word(sb
, 0x64, 0x295);
112 pci_write_config_byte(sb
, 0x48, enable
| BIT(2));
118 static int __init
hwmon_init(void)
122 hwmon_class
= class_create(THIS_MODULE
, "hwmon");
123 if (IS_ERR(hwmon_class
)) {
124 pr_err("couldn't create sysfs class\n");
125 return PTR_ERR(hwmon_class
);
130 static void __exit
hwmon_exit(void)
132 class_destroy(hwmon_class
);
135 subsys_initcall(hwmon_init
);
136 module_exit(hwmon_exit
);
138 EXPORT_SYMBOL_GPL(hwmon_device_register
);
139 EXPORT_SYMBOL_GPL(hwmon_device_unregister
);
141 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
142 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
143 MODULE_LICENSE("GPL");
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