tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 "i2o.h"
18
19#define OSM_NAME "bus-osm"
20#define OSM_VERSION "1.317"
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 *msg;
43
44 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
45 if (IS_ERR(msg))
46 return -ETIMEDOUT;
47
48 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
49 msg->u.head[1] =
50 cpu_to_le32(I2O_CMD_BUS_SCAN << 24 | HOST_TID << 12 | dev->lct_data.
51 tid);
52
53 return i2o_msg_post_wait(dev->iop, msg, 60);
54};
55
56/**
57 * i2o_bus_store_scan - Scan the I2O Bus Adapter
58 * @d: device which should be scanned
59 * @attr: device_attribute
60 * @buf: output buffer
61 * @count: buffer size
62 *
63 * Returns count.
64 */
65static ssize_t i2o_bus_store_scan(struct device *d,
66 struct device_attribute *attr,
67 const char *buf, size_t count)
68{
69 struct i2o_device *i2o_dev = to_i2o_device(d);
70 int rc;
71
72 rc = i2o_bus_scan(i2o_dev);
73 if (rc)
74 osm_warn("bus scan failed %d\n", rc);
75
76 return count;
77}
78
79/* Bus Adapter OSM device attributes */
80static DEVICE_ATTR(scan, S_IWUSR, NULL, i2o_bus_store_scan);
81
82/**
83 * i2o_bus_probe - verify if dev is a I2O Bus Adapter device and install it
84 * @dev: device to verify if it is a I2O Bus Adapter device
85 *
86 * Because we want all Bus Adapters always return 0.
87 * Except when we fail. Then we are sad.
88 *
89 * Returns 0, except when we fail to excel.
90 */
91static int i2o_bus_probe(struct device *dev)
92{
93 struct i2o_device *i2o_dev = to_i2o_device(get_device(dev));
94 int rc;
95
96 rc = device_create_file(dev, &dev_attr_scan);
97 if (rc)
98 goto err_out;
99
100 osm_info("device added (TID: %03x)\n", i2o_dev->lct_data.tid);
101
102 return 0;
103
104err_out:
105 put_device(dev);
106 return rc;
107};
108
109/**
110 * i2o_bus_remove - remove the I2O Bus Adapter device from the system again
111 * @dev: I2O Bus Adapter device which should be removed
112 *
113 * Always returns 0.
114 */
115static int i2o_bus_remove(struct device *dev)
116{
117 struct i2o_device *i2o_dev = to_i2o_device(dev);
118
119 device_remove_file(dev, &dev_attr_scan);
120
121 put_device(dev);
122
123 osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
124
125 return 0;
126};
127
128/* Bus Adapter OSM driver struct */
129static struct i2o_driver i2o_bus_driver = {
130 .name = OSM_NAME,
131 .classes = i2o_bus_class_id,
132 .driver = {
133 .probe = i2o_bus_probe,
134 .remove = i2o_bus_remove,
135 },
136};
137
138/**
139 * i2o_bus_init - Bus Adapter OSM initialization function
140 *
141 * Only register the Bus Adapter OSM in the I2O core.
142 *
143 * Returns 0 on success or negative error code on failure.
144 */
145static int __init i2o_bus_init(void)
146{
147 int rc;
148
149 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
150
151 /* Register Bus Adapter OSM into I2O core */
152 rc = i2o_driver_register(&i2o_bus_driver);
153 if (rc) {
154 osm_err("Could not register Bus Adapter OSM\n");
155 return rc;
156 }
157
158 return 0;
159};
160
161/**
162 * i2o_bus_exit - Bus Adapter OSM exit function
163 *
164 * Unregisters Bus Adapter OSM from I2O core.
165 */
166static void __exit i2o_bus_exit(void)
167{
168 i2o_driver_unregister(&i2o_bus_driver);
169};
170
171MODULE_AUTHOR("Markus Lidel <Markus.Lidel@shadowconnect.com>");
172MODULE_LICENSE("GPL");
173MODULE_DESCRIPTION(OSM_DESCRIPTION);
174MODULE_VERSION(OSM_VERSION);
175
176module_init(i2o_bus_init);
177module_exit(i2o_bus_exit);