1/*
2 * edac_module.c
3 *
4 * (C) 2007 www.softwarebitmaker.com
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 *
10 * Author: Doug Thompson <dougthompson@xmission.com>
11 *
12 */
13#include <linux/edac.h>
14
15#include "edac_mc.h"
16#include "edac_module.h"
17
18#define EDAC_VERSION "Ver: 3.0.0"
19
20#ifdef CONFIG_EDAC_DEBUG
21
22static int edac_set_debug_level(const char *buf,
23				const struct kernel_param *kp)
24{
25	unsigned long val;
26	int ret;
27
28	ret = kstrtoul(buf, 0, &val);
29	if (ret)
30		return ret;
31
32	if (val > 4)
33		return -EINVAL;
34
35	return param_set_int(buf, kp);
36}
37
38/* Values of 0 to 4 will generate output */
39int edac_debug_level = 2;
40EXPORT_SYMBOL_GPL(edac_debug_level);
41
42module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
43		  &edac_debug_level, 0644);
44MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
45#endif
46
47/*
48 * edac_op_state_to_string()
49 */
50char *edac_op_state_to_string(int opstate)
51{
52	if (opstate == OP_RUNNING_POLL)
53		return "POLLED";
54	else if (opstate == OP_RUNNING_INTERRUPT)
55		return "INTERRUPT";
56	else if (opstate == OP_RUNNING_POLL_INTR)
57		return "POLL-INTR";
58	else if (opstate == OP_ALLOC)
59		return "ALLOC";
60	else if (opstate == OP_OFFLINE)
61		return "OFFLINE";
62
63	return "UNKNOWN";
64}
65
66/*
67 * sysfs object: /sys/devices/system/edac
68 *	need to export to other files
69 */
70static const struct bus_type edac_subsys = {
71	.name = "edac",
72	.dev_name = "edac",
73};
74
75static int edac_subsys_init(void)
76{
77	int err;
78
79	/* create the /sys/devices/system/edac directory */
80	err = subsys_system_register(&edac_subsys, NULL);
81	if (err)
82		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
83
84	return err;
85}
86
87static void edac_subsys_exit(void)
88{
89	bus_unregister(&edac_subsys);
90}
91
92/* return pointer to the 'edac' node in sysfs */
93const struct bus_type *edac_get_sysfs_subsys(void)
94{
95	return &edac_subsys;
96}
97EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
98/*
99 * edac_init
100 *      module initialization entry point
101 */
102static int __init edac_init(void)
103{
104	int err = 0;
105
106	edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");
107
108	err = edac_subsys_init();
109	if (err)
110		return err;
111
112	/*
113	 * Harvest and clear any boot/initialization PCI parity errors
114	 *
115	 * FIXME: This only clears errors logged by devices present at time of
116	 *      module initialization.  We should also do an initial clear
117	 *      of each newly hotplugged device.
118	 */
119	edac_pci_clear_parity_errors();
120
121	err = edac_mc_sysfs_init();
122	if (err)
123		goto err_sysfs;
124
125	edac_debugfs_init();
126
127	err = edac_workqueue_setup();
128	if (err) {
129		edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n");
130		goto err_wq;
131	}
132
133	return 0;
134
135err_wq:
136	edac_debugfs_exit();
137	edac_mc_sysfs_exit();
138
139err_sysfs:
140	edac_subsys_exit();
141
142	return err;
143}
144
145/*
146 * edac_exit()
147 *      module exit/termination function
148 */
149static void __exit edac_exit(void)
150{
151	edac_dbg(0, "\n");
152
153	/* tear down the various subsystems */
154	edac_workqueue_teardown();
155	edac_mc_sysfs_exit();
156	edac_debugfs_exit();
157	edac_subsys_exit();
158}
159
160/*
161 * Inform the kernel of our entry and exit points
162 */
163subsys_initcall(edac_init);
164module_exit(edac_exit);
165
166MODULE_LICENSE("GPL");
167MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
168MODULE_DESCRIPTION("Core library routines for EDAC reporting");
169