bus-osm.c revision 3e05d2b8d3dd34b0237f489e991ed081cb0bf007 
1/*
2 *	Bus Adapter OSM
3 *
4 *	Copyright (C) 2005	Markus Lidel <Markus.Lidel@shadowconnect.com>
5 *
6 *	This program is free software; you can redistribute it and/or modify it
7 *	under the terms of the GNU General Public License as published by the
8 *	Free Software Foundation; either version 2 of the License, or (at your
9 *	option) any later version.
10 *
11 *	Fixes/additions:
12 *		Markus Lidel <Markus.Lidel@shadowconnect.com>
13 *			initial version.
14 */
15
16#include <linux/module.h>
17#include <linux/i2o.h>
18
19#define OSM_NAME	"bus-osm"
20#define OSM_VERSION	"$Rev$"
21#define OSM_DESCRIPTION	"I2O Bus Adapter OSM"
22
23static struct i2o_driver i2o_bus_driver;
24
25/* Bus OSM class handling definition */
26static struct i2o_class_id i2o_bus_class_id[] = {
27	{I2O_CLASS_BUS_ADAPTER},
28	{I2O_CLASS_END}
29};
30
31/**
32 *	i2o_bus_scan - Scan the bus for new devices
33 *	@dev: I2O device of the bus, which should be scanned
34 *
35 *	Scans the bus dev for new / removed devices. After the scan a new LCT
36 *	will be fetched automatically.
37 *
38 *	Returns 0 on success or negative error code on failure.
39 */
40static int i2o_bus_scan(struct i2o_device *dev)
41{
42	struct i2o_message __iomem *msg;
43	u32 m;
44
45	m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
46	if (m == I2O_QUEUE_EMPTY)
47		return -ETIMEDOUT;
48
49	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
50	writel(I2O_CMD_BUS_SCAN << 24 | HOST_TID << 12 | dev->lct_data.tid,
51	       &msg->u.head[1]);
52
53	return i2o_msg_post_wait(dev->iop, m, 60);
54};
55
56/**
57 *	i2o_bus_store_scan - Scan the I2O Bus Adapter
58 *	@d: device which should be scanned
59 *
60 *	Returns count.
61 */
62static ssize_t i2o_bus_store_scan(struct device *d, struct device_attribute *attr, const char *buf,
63				  size_t count)
64{
65	struct i2o_device *i2o_dev = to_i2o_device(d);
66	int rc;
67
68	if ((rc = i2o_bus_scan(i2o_dev)))
69		osm_warn("bus scan failed %d\n", rc);
70
71	return count;
72}
73
74/* Bus Adapter OSM device attributes */
75static DEVICE_ATTR(scan, S_IWUSR, NULL, i2o_bus_store_scan);
76
77/**
78 *	i2o_bus_probe - verify if dev is a I2O Bus Adapter device and install it
79 *	@dev: device to verify if it is a I2O Bus Adapter device
80 *
81 *	Because we want all Bus Adapters always return 0.
82 *
83 *	Returns 0.
84 */
85static int i2o_bus_probe(struct device *dev)
86{
87	struct i2o_device *i2o_dev = to_i2o_device(get_device(dev));
88
89	device_create_file(dev, &dev_attr_scan);
90
91	osm_info("device added (TID: %03x)\n", i2o_dev->lct_data.tid);
92
93	return 0;
94};
95
96/**
97 *	i2o_bus_remove - remove the I2O Bus Adapter device from the system again
98 *	@dev: I2O Bus Adapter device which should be removed
99 *
100 *	Always returns 0.
101 */
102static int i2o_bus_remove(struct device *dev)
103{
104	struct i2o_device *i2o_dev = to_i2o_device(dev);
105
106	device_remove_file(dev, &dev_attr_scan);
107
108	put_device(dev);
109
110	osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
111
112	return 0;
113};
114
115/* Bus Adapter OSM driver struct */
116static struct i2o_driver i2o_bus_driver = {
117	.name = OSM_NAME,
118	.classes = i2o_bus_class_id,
119	.driver = {
120		   .probe = i2o_bus_probe,
121		   .remove = i2o_bus_remove,
122		   },
123};
124
125/**
126 *	i2o_bus_init - Bus Adapter OSM initialization function
127 *
128 *	Only register the Bus Adapter OSM in the I2O core.
129 *
130 *	Returns 0 on success or negative error code on failure.
131 */
132static int __init i2o_bus_init(void)
133{
134	int rc;
135
136	printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
137
138	/* Register Bus Adapter OSM into I2O core */
139	rc = i2o_driver_register(&i2o_bus_driver);
140	if (rc) {
141		osm_err("Could not register Bus Adapter OSM\n");
142		return rc;
143	}
144
145	return 0;
146};
147
148/**
149 *	i2o_bus_exit - Bus Adapter OSM exit function
150 *
151 *	Unregisters Bus Adapter OSM from I2O core.
152 */
153static void __exit i2o_bus_exit(void)
154{
155	i2o_driver_unregister(&i2o_bus_driver);
156};
157
158MODULE_AUTHOR("Markus Lidel <Markus.Lidel@shadowconnect.com>");
159MODULE_LICENSE("GPL");
160MODULE_DESCRIPTION(OSM_DESCRIPTION);
161MODULE_VERSION(OSM_VERSION);
162
163module_init(i2o_bus_init);
164module_exit(i2o_bus_exit);
165