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_IDA(hwmon_ida
);
33 * hwmon_device_register - register w/ hwmon
34 * @dev: the device to register
36 * hwmon_device_unregister() must be called when the device is no
39 * Returns the pointer to the new device.
41 struct device
*hwmon_device_register(struct device
*dev
)
46 id
= ida_simple_get(&hwmon_ida
, 0, 0, GFP_KERNEL
);
50 hwdev
= device_create(hwmon_class
, dev
, MKDEV(0, 0), NULL
,
54 ida_simple_remove(&hwmon_ida
, id
);
60 * hwmon_device_unregister - removes the previously registered class device
62 * @dev: the class device to destroy
64 void hwmon_device_unregister(struct device
*dev
)
68 if (likely(sscanf(dev_name(dev
), HWMON_ID_FORMAT
, &id
) == 1)) {
69 device_unregister(dev
);
70 ida_simple_remove(&hwmon_ida
, id
);
73 "hwmon_device_unregister() failed: bad class ID!\n");
76 static void __init
hwmon_pci_quirks(void)
78 #if defined CONFIG_X86 && defined CONFIG_PCI
83 /* Open access to 0x295-0x296 on MSI MS-7031 */
84 sb
= pci_get_device(PCI_VENDOR_ID_ATI
, 0x436c, NULL
);
86 (sb
->subsystem_vendor
== 0x1462 && /* MSI */
87 sb
->subsystem_device
== 0x0031)) { /* MS-7031 */
89 pci_read_config_byte(sb
, 0x48, &enable
);
90 pci_read_config_word(sb
, 0x64, &base
);
92 if (base
== 0 && !(enable
& BIT(2))) {
94 "Opening wide generic port at 0x295\n");
95 pci_write_config_word(sb
, 0x64, 0x295);
96 pci_write_config_byte(sb
, 0x48, enable
| BIT(2));
102 static int __init
hwmon_init(void)
106 hwmon_class
= class_create(THIS_MODULE
, "hwmon");
107 if (IS_ERR(hwmon_class
)) {
108 pr_err("couldn't create sysfs class\n");
109 return PTR_ERR(hwmon_class
);
114 static void __exit
hwmon_exit(void)
116 class_destroy(hwmon_class
);
119 subsys_initcall(hwmon_init
);
120 module_exit(hwmon_exit
);
122 EXPORT_SYMBOL_GPL(hwmon_device_register
);
123 EXPORT_SYMBOL_GPL(hwmon_device_unregister
);
125 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
126 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
127 MODULE_LICENSE("GPL");