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 "1.317"
21 #define OSM_DESCRIPTION "I2O Bus Adapter OSM"
22
23 static struct i2o_driver i2o_bus_driver;
24
25 /* Bus OSM class handling definition */
26 static 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 */
i2o_bus_scan(struct i2o_device * dev)40 static 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 */
i2o_bus_store_scan(struct device * d,struct device_attribute * attr,const char * buf,size_t count)65 static 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 if ((rc = i2o_bus_scan(i2o_dev)))
73 osm_warn("bus scan failed %d\n", rc);
74
75 return count;
76 }
77
78 /* Bus Adapter OSM device attributes */
79 static DEVICE_ATTR(scan, S_IWUSR, NULL, i2o_bus_store_scan);
80
81 /**
82 * i2o_bus_probe - verify if dev is a I2O Bus Adapter device and install it
83 * @dev: device to verify if it is a I2O Bus Adapter device
84 *
85 * Because we want all Bus Adapters always return 0.
86 * Except when we fail. Then we are sad.
87 *
88 * Returns 0, except when we fail to excel.
89 */
i2o_bus_probe(struct device * dev)90 static int i2o_bus_probe(struct device *dev)
91 {
92 struct i2o_device *i2o_dev = to_i2o_device(get_device(dev));
93 int rc;
94
95 rc = device_create_file(dev, &dev_attr_scan);
96 if (rc)
97 goto err_out;
98
99 osm_info("device added (TID: %03x)\n", i2o_dev->lct_data.tid);
100
101 return 0;
102
103 err_out:
104 put_device(dev);
105 return rc;
106 };
107
108 /**
109 * i2o_bus_remove - remove the I2O Bus Adapter device from the system again
110 * @dev: I2O Bus Adapter device which should be removed
111 *
112 * Always returns 0.
113 */
i2o_bus_remove(struct device * dev)114 static int i2o_bus_remove(struct device *dev)
115 {
116 struct i2o_device *i2o_dev = to_i2o_device(dev);
117
118 device_remove_file(dev, &dev_attr_scan);
119
120 put_device(dev);
121
122 osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
123
124 return 0;
125 };
126
127 /* Bus Adapter OSM driver struct */
128 static struct i2o_driver i2o_bus_driver = {
129 .name = OSM_NAME,
130 .classes = i2o_bus_class_id,
131 .driver = {
132 .probe = i2o_bus_probe,
133 .remove = i2o_bus_remove,
134 },
135 };
136
137 /**
138 * i2o_bus_init - Bus Adapter OSM initialization function
139 *
140 * Only register the Bus Adapter OSM in the I2O core.
141 *
142 * Returns 0 on success or negative error code on failure.
143 */
i2o_bus_init(void)144 static int __init i2o_bus_init(void)
145 {
146 int rc;
147
148 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
149
150 /* Register Bus Adapter OSM into I2O core */
151 rc = i2o_driver_register(&i2o_bus_driver);
152 if (rc) {
153 osm_err("Could not register Bus Adapter OSM\n");
154 return rc;
155 }
156
157 return 0;
158 };
159
160 /**
161 * i2o_bus_exit - Bus Adapter OSM exit function
162 *
163 * Unregisters Bus Adapter OSM from I2O core.
164 */
i2o_bus_exit(void)165 static void __exit i2o_bus_exit(void)
166 {
167 i2o_driver_unregister(&i2o_bus_driver);
168 };
169
170 MODULE_AUTHOR("Markus Lidel <Markus.Lidel@shadowconnect.com>");
171 MODULE_LICENSE("GPL");
172 MODULE_DESCRIPTION(OSM_DESCRIPTION);
173 MODULE_VERSION(OSM_VERSION);
174
175 module_init(i2o_bus_init);
176 module_exit(i2o_bus_exit);
177