2 * Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
4 * Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com>
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.
12 * Markus Lidel <Markus.Lidel@shadowconnect.com>
16 #include <linux/device.h>
17 #include <linux/module.h>
18 #include <linux/rwsem.h>
19 #include <linux/i2o.h>
22 /* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
23 unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
24 module_param_named(max_drivers, i2o_max_drivers, uint, 0);
25 MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
27 /* I2O drivers lock and array */
28 static spinlock_t i2o_drivers_lock = SPIN_LOCK_UNLOCKED;
29 static struct i2o_driver **i2o_drivers;
32 * i2o_bus_match - Tell if a I2O device class id match the class ids of
33 * the I2O driver (OSM)
35 * @dev: device which should be verified
36 * @drv: the driver to match against
38 * Used by the bus to check if the driver wants to handle the device.
40 * Returns 1 if the class ids of the driver match the class id of the
41 * device, otherwise 0.
43 static int i2o_bus_match(struct device *dev, struct device_driver *drv)
45 struct i2o_device *i2o_dev = to_i2o_device(dev);
46 struct i2o_driver *i2o_drv = to_i2o_driver(drv);
47 struct i2o_class_id *ids = i2o_drv->classes;
50 while (ids->class_id != I2O_CLASS_END) {
51 if (ids->class_id == i2o_dev->lct_data.class_id)
59 struct bus_type i2o_bus_type = {
61 .match = i2o_bus_match,
65 * i2o_driver_register - Register a I2O driver (OSM) in the I2O core
66 * @drv: I2O driver which should be registered
68 * Registers the OSM drv in the I2O core and creates an event queues if
71 * Returns 0 on success or negative error code on failure.
73 int i2o_driver_register(struct i2o_driver *drv)
75 struct i2o_controller *c;
80 pr_debug("Register driver %s\n", drv->name);
83 drv->event_queue = create_workqueue(drv->name);
84 if (!drv->event_queue) {
85 printk(KERN_ERR "i2o: Could not initialize event queue "
86 "for driver %s\n", drv->name);
89 pr_debug("Event queue initialized for driver %s\n", drv->name);
91 drv->event_queue = NULL;
93 drv->driver.name = drv->name;
94 drv->driver.bus = &i2o_bus_type;
96 spin_lock_irqsave(&i2o_drivers_lock, flags);
98 for (i = 0; i2o_drivers[i]; i++)
99 if (i >= i2o_max_drivers) {
100 printk(KERN_ERR "i2o: too many drivers registered, "
101 "increase max_drivers\n");
102 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
107 i2o_drivers[i] = drv;
109 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
111 pr_debug("driver %s gets context id %d\n", drv->name, drv->context);
113 list_for_each_entry(c, &i2o_controllers, list) {
114 struct i2o_device *i2o_dev;
116 i2o_driver_notify_controller_add(drv, c);
117 list_for_each_entry(i2o_dev, &c->devices, list)
118 i2o_driver_notify_device_add(drv, i2o_dev);
122 rc = driver_register(&drv->driver);
124 destroy_workqueue(drv->event_queue);
130 * i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
131 * @drv: I2O driver which should be unregistered
133 * Unregisters the OSM drv from the I2O core and cleanup event queues if
136 void i2o_driver_unregister(struct i2o_driver *drv)
138 struct i2o_controller *c;
141 pr_debug("unregister driver %s\n", drv->name);
143 driver_unregister(&drv->driver);
145 list_for_each_entry(c, &i2o_controllers, list) {
146 struct i2o_device *i2o_dev;
148 list_for_each_entry(i2o_dev, &c->devices, list)
149 i2o_driver_notify_device_remove(drv, i2o_dev);
151 i2o_driver_notify_controller_remove(drv, c);
154 spin_lock_irqsave(&i2o_drivers_lock, flags);
155 i2o_drivers[drv->context] = NULL;
156 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
158 if (drv->event_queue) {
159 destroy_workqueue(drv->event_queue);
160 drv->event_queue = NULL;
161 pr_debug("event queue removed for %s\n", drv->name);
166 * i2o_driver_dispatch - dispatch an I2O reply message
167 * @c: I2O controller of the message
168 * @m: I2O message number
169 * @msg: I2O message to be delivered
171 * The reply is delivered to the driver from which the original message
172 * was. This function is only called from interrupt context.
174 * Returns 0 on success and the message should not be flushed. Returns > 0
175 * on success and if the message should be flushed afterwords. Returns
176 * negative error code on failure (the message will be flushed too).
178 int i2o_driver_dispatch(struct i2o_controller *c, u32 m,
179 struct i2o_message *msg)
181 struct i2o_driver *drv;
182 u32 context = readl(&msg->u.s.icntxt);
184 if (likely(context < i2o_max_drivers)) {
185 spin_lock(&i2o_drivers_lock);
186 drv = i2o_drivers[context];
187 spin_unlock(&i2o_drivers_lock);
189 if (unlikely(!drv)) {
190 printk(KERN_WARNING "i2o: Spurious reply to unknown "
191 "driver %d\n", context);
195 if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
196 struct i2o_device *dev, *tmp;
197 struct i2o_event *evt;
201 tid = readl(&msg->u.head[1]) & 0x1fff;
203 pr_debug("%s: event received from device %d\n", c->name,
206 /* cut of header from message size (in 32-bit words) */
207 size = (readl(&msg->u.head[0]) >> 16) - 5;
209 evt = kmalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
212 memset(evt, 0, size * 4 + sizeof(*evt));
215 memcpy_fromio(&evt->tcntxt, &msg->u.s.tcntxt,
218 list_for_each_entry_safe(dev, tmp, &c->devices, list)
219 if (dev->lct_data.tid == tid) {
224 INIT_WORK(&evt->work, (void (*)(void *))drv->event,
226 queue_work(drv->event_queue, &evt->work);
230 if (likely(drv->reply))
231 return drv->reply(c, m, msg);
233 pr_debug("%s: Reply to driver %s, but no reply function"
234 " defined!\n", c->name, drv->name);
237 printk(KERN_WARNING "i2o: Spurious reply to unknown driver "
238 "%d\n", readl(&msg->u.s.icntxt));
243 * i2o_driver_notify_controller_add_all - Send notify of added controller
246 * Send notifications to all registered drivers that a new controller was
249 void i2o_driver_notify_controller_add_all(struct i2o_controller *c) {
251 struct i2o_driver *drv;
253 for(i = 0; i < I2O_MAX_DRIVERS; i ++) {
254 drv = i2o_drivers[i];
257 i2o_driver_notify_controller_add(drv, c);
262 * i2o_driver_notify_controller_remove_all - Send notify of removed
263 * controller to all I2O drivers
265 * Send notifications to all registered drivers that a controller was
268 void i2o_driver_notify_controller_remove_all(struct i2o_controller *c) {
270 struct i2o_driver *drv;
272 for(i = 0; i < I2O_MAX_DRIVERS; i ++) {
273 drv = i2o_drivers[i];
276 i2o_driver_notify_controller_remove(drv, c);
281 * i2o_driver_notify_device_add_all - Send notify of added device to all
284 * Send notifications to all registered drivers that a device was added.
286 void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev) {
288 struct i2o_driver *drv;
290 for(i = 0; i < I2O_MAX_DRIVERS; i ++) {
291 drv = i2o_drivers[i];
294 i2o_driver_notify_device_add(drv, i2o_dev);
299 * i2o_driver_notify_device_remove_all - Send notify of removed device to
302 * Send notifications to all registered drivers that a device was removed.
304 void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev) {
306 struct i2o_driver *drv;
308 for(i = 0; i < I2O_MAX_DRIVERS; i ++) {
309 drv = i2o_drivers[i];
312 i2o_driver_notify_device_remove(drv, i2o_dev);
317 * i2o_driver_init - initialize I2O drivers (OSMs)
319 * Registers the I2O bus and allocate memory for the array of OSMs.
321 * Returns 0 on success or negative error code on failure.
323 int __init i2o_driver_init(void)
327 if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) ||
328 ((i2o_max_drivers ^ (i2o_max_drivers - 1)) !=
329 (2 * i2o_max_drivers - 1))) {
330 printk(KERN_WARNING "i2o: max_drivers set to %d, but must be "
331 ">=2 and <= 64 and a power of 2\n", i2o_max_drivers);
332 i2o_max_drivers = I2O_MAX_DRIVERS;
334 printk(KERN_INFO "i2o: max_drivers=%d\n", i2o_max_drivers);
337 kmalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL);
341 memset(i2o_drivers, 0, i2o_max_drivers * sizeof(*i2o_drivers));
343 rc = bus_register(&i2o_bus_type);
352 * i2o_driver_exit - clean up I2O drivers (OSMs)
354 * Unregisters the I2O bus and free driver array.
356 void __exit i2o_driver_exit(void)
358 bus_unregister(&i2o_bus_type);
362 EXPORT_SYMBOL(i2o_driver_register);
363 EXPORT_SYMBOL(i2o_driver_unregister);
364 EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
365 EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
366 EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
367 EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);