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16#include <linux/device.h>
17#include <linux/module.h>
18#include <linux/rwsem.h>
19#include <linux/i2o.h>
20#include <linux/workqueue.h>
21#include <linux/string.h>
22#include <linux/slab.h>
23#include "core.h"
24
25#define OSM_NAME "i2o"
26
27
28static unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
29module_param_named(max_drivers, i2o_max_drivers, uint, 0);
30MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
31
32
33static spinlock_t i2o_drivers_lock;
34static struct i2o_driver **i2o_drivers;
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45
46static int i2o_bus_match(struct device *dev, struct device_driver *drv)
47{
48 struct i2o_device *i2o_dev = to_i2o_device(dev);
49 struct i2o_driver *i2o_drv = to_i2o_driver(drv);
50 struct i2o_class_id *ids = i2o_drv->classes;
51
52 if (ids)
53 while (ids->class_id != I2O_CLASS_END) {
54 if (ids->class_id == i2o_dev->lct_data.class_id)
55 return 1;
56 ids++;
57 }
58 return 0;
59};
60
61
62struct bus_type i2o_bus_type = {
63 .name = "i2o",
64 .match = i2o_bus_match,
65 .dev_attrs = i2o_device_attrs
66};
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76
77int i2o_driver_register(struct i2o_driver *drv)
78{
79 struct i2o_controller *c;
80 int i;
81 int rc = 0;
82 unsigned long flags;
83
84 osm_debug("Register driver %s\n", drv->name);
85
86 if (drv->event) {
87 drv->event_queue = alloc_workqueue(drv->name,
88 WQ_MEM_RECLAIM, 1);
89 if (!drv->event_queue) {
90 osm_err("Could not initialize event queue for driver "
91 "%s\n", drv->name);
92 return -EFAULT;
93 }
94 osm_debug("Event queue initialized for driver %s\n", drv->name);
95 } else
96 drv->event_queue = NULL;
97
98 drv->driver.name = drv->name;
99 drv->driver.bus = &i2o_bus_type;
100
101 spin_lock_irqsave(&i2o_drivers_lock, flags);
102
103 for (i = 0; i2o_drivers[i]; i++)
104 if (i >= i2o_max_drivers) {
105 osm_err("too many drivers registered, increase "
106 "max_drivers\n");
107 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
108 return -EFAULT;
109 }
110
111 drv->context = i;
112 i2o_drivers[i] = drv;
113
114 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
115
116 osm_debug("driver %s gets context id %d\n", drv->name, drv->context);
117
118 list_for_each_entry(c, &i2o_controllers, list) {
119 struct i2o_device *i2o_dev;
120
121 i2o_driver_notify_controller_add(drv, c);
122 list_for_each_entry(i2o_dev, &c->devices, list)
123 i2o_driver_notify_device_add(drv, i2o_dev);
124 }
125
126 rc = driver_register(&drv->driver);
127 if (rc) {
128 if (drv->event) {
129 destroy_workqueue(drv->event_queue);
130 drv->event_queue = NULL;
131 }
132 }
133
134 return rc;
135};
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143
144void i2o_driver_unregister(struct i2o_driver *drv)
145{
146 struct i2o_controller *c;
147 unsigned long flags;
148
149 osm_debug("unregister driver %s\n", drv->name);
150
151 driver_unregister(&drv->driver);
152
153 list_for_each_entry(c, &i2o_controllers, list) {
154 struct i2o_device *i2o_dev;
155
156 list_for_each_entry(i2o_dev, &c->devices, list)
157 i2o_driver_notify_device_remove(drv, i2o_dev);
158
159 i2o_driver_notify_controller_remove(drv, c);
160 }
161
162 spin_lock_irqsave(&i2o_drivers_lock, flags);
163 i2o_drivers[drv->context] = NULL;
164 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
165
166 if (drv->event_queue) {
167 destroy_workqueue(drv->event_queue);
168 drv->event_queue = NULL;
169 osm_debug("event queue removed for %s\n", drv->name);
170 }
171};
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185int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
186{
187 struct i2o_driver *drv;
188 struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
189 u32 context = le32_to_cpu(msg->u.s.icntxt);
190 unsigned long flags;
191
192 if (unlikely(context >= i2o_max_drivers)) {
193 osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
194 context);
195 return -EIO;
196 }
197
198 spin_lock_irqsave(&i2o_drivers_lock, flags);
199 drv = i2o_drivers[context];
200 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
201
202 if (unlikely(!drv)) {
203 osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
204 context);
205 return -EIO;
206 }
207
208 if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
209 struct i2o_device *dev, *tmp;
210 struct i2o_event *evt;
211 u16 size;
212 u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;
213
214 osm_debug("event received from device %d\n", tid);
215
216 if (!drv->event)
217 return -EIO;
218
219
220 size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;
221
222 evt = kzalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
223 if (!evt)
224 return -ENOMEM;
225
226 evt->size = size;
227 evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
228 evt->event_indicator = le32_to_cpu(msg->body[0]);
229 memcpy(&evt->data, &msg->body[1], size * 4);
230
231 list_for_each_entry_safe(dev, tmp, &c->devices, list)
232 if (dev->lct_data.tid == tid) {
233 evt->i2o_dev = dev;
234 break;
235 }
236
237 INIT_WORK(&evt->work, drv->event);
238 queue_work(drv->event_queue, &evt->work);
239 return 1;
240 }
241
242 if (unlikely(!drv->reply)) {
243 osm_debug("%s: Reply to driver %s, but no reply function"
244 " defined!\n", c->name, drv->name);
245 return -EIO;
246 }
247
248 return drv->reply(c, m, msg);
249}
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258void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
259{
260 int i;
261 struct i2o_driver *drv;
262
263 for (i = 0; i < i2o_max_drivers; i++) {
264 drv = i2o_drivers[i];
265
266 if (drv)
267 i2o_driver_notify_controller_add(drv, c);
268 }
269}
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278void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
279{
280 int i;
281 struct i2o_driver *drv;
282
283 for (i = 0; i < i2o_max_drivers; i++) {
284 drv = i2o_drivers[i];
285
286 if (drv)
287 i2o_driver_notify_controller_remove(drv, c);
288 }
289}
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297void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
298{
299 int i;
300 struct i2o_driver *drv;
301
302 for (i = 0; i < i2o_max_drivers; i++) {
303 drv = i2o_drivers[i];
304
305 if (drv)
306 i2o_driver_notify_device_add(drv, i2o_dev);
307 }
308}
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316void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
317{
318 int i;
319 struct i2o_driver *drv;
320
321 for (i = 0; i < i2o_max_drivers; i++) {
322 drv = i2o_drivers[i];
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324 if (drv)
325 i2o_driver_notify_device_remove(drv, i2o_dev);
326 }
327}
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336int __init i2o_driver_init(void)
337{
338 int rc = 0;
339
340 spin_lock_init(&i2o_drivers_lock);
341
342 if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64)) {
343 osm_warn("max_drivers set to %d, but must be >=2 and <= 64\n",
344 i2o_max_drivers);
345 i2o_max_drivers = I2O_MAX_DRIVERS;
346 }
347 osm_info("max drivers = %d\n", i2o_max_drivers);
348
349 i2o_drivers =
350 kcalloc(i2o_max_drivers, sizeof(*i2o_drivers), GFP_KERNEL);
351 if (!i2o_drivers)
352 return -ENOMEM;
353
354 rc = bus_register(&i2o_bus_type);
355
356 if (rc < 0)
357 kfree(i2o_drivers);
358
359 return rc;
360};
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367void i2o_driver_exit(void)
368{
369 bus_unregister(&i2o_bus_type);
370 kfree(i2o_drivers);
371};
372
373EXPORT_SYMBOL(i2o_driver_register);
374EXPORT_SYMBOL(i2o_driver_unregister);
375EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
376EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
377EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
378EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);
379