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
 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	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 */
 79static 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 */
 90static 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
103err_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 */
114static 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 */
128static 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 */
144static 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 */
165static void __exit i2o_bus_exit(void)
166{
167	i2o_driver_unregister(&i2o_bus_driver);
168};
169
170MODULE_AUTHOR("Markus Lidel <Markus.Lidel@shadowconnect.com>");
171MODULE_LICENSE("GPL");
172MODULE_DESCRIPTION(OSM_DESCRIPTION);
173MODULE_VERSION(OSM_VERSION);
174
175module_init(i2o_bus_init);
176module_exit(i2o_bus_exit);