Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * The Serio abstraction module |
| 3 | * |
| 4 | * Copyright (c) 1999-2004 Vojtech Pavlik |
| 5 | * Copyright (c) 2004 Dmitry Torokhov |
| 6 | * Copyright (c) 2003 Daniele Bellucci |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | * |
| 24 | * Should you need to contact me, the author, you can do so either by |
| 25 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: |
| 26 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic |
| 27 | */ |
| 28 | |
| 29 | #include <linux/stddef.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/serio.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/wait.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/slab.h> |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 36 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 39 | MODULE_DESCRIPTION("Serio abstraction core"); |
| 40 | MODULE_LICENSE("GPL"); |
| 41 | |
| 42 | EXPORT_SYMBOL(serio_interrupt); |
| 43 | EXPORT_SYMBOL(__serio_register_port); |
| 44 | EXPORT_SYMBOL(serio_unregister_port); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 45 | EXPORT_SYMBOL(serio_unregister_child_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | EXPORT_SYMBOL(__serio_unregister_port_delayed); |
| 47 | EXPORT_SYMBOL(__serio_register_driver); |
| 48 | EXPORT_SYMBOL(serio_unregister_driver); |
| 49 | EXPORT_SYMBOL(serio_open); |
| 50 | EXPORT_SYMBOL(serio_close); |
| 51 | EXPORT_SYMBOL(serio_rescan); |
| 52 | EXPORT_SYMBOL(serio_reconnect); |
| 53 | |
| 54 | /* |
| 55 | * serio_sem protects entire serio subsystem and is taken every time |
| 56 | * serio port or driver registrered or unregistered. |
| 57 | */ |
| 58 | static DECLARE_MUTEX(serio_sem); |
| 59 | |
| 60 | static LIST_HEAD(serio_list); |
| 61 | |
| 62 | static struct bus_type serio_bus = { |
| 63 | .name = "serio", |
| 64 | }; |
| 65 | |
| 66 | static void serio_add_port(struct serio *serio); |
| 67 | static void serio_destroy_port(struct serio *serio); |
| 68 | static void serio_reconnect_port(struct serio *serio); |
| 69 | static void serio_disconnect_port(struct serio *serio); |
| 70 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 71 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
| 72 | { |
| 73 | int retval; |
| 74 | |
| 75 | down(&serio->drv_sem); |
| 76 | retval = drv->connect(serio, drv); |
| 77 | up(&serio->drv_sem); |
| 78 | |
| 79 | return retval; |
| 80 | } |
| 81 | |
| 82 | static int serio_reconnect_driver(struct serio *serio) |
| 83 | { |
| 84 | int retval = -1; |
| 85 | |
| 86 | down(&serio->drv_sem); |
| 87 | if (serio->drv && serio->drv->reconnect) |
| 88 | retval = serio->drv->reconnect(serio); |
| 89 | up(&serio->drv_sem); |
| 90 | |
| 91 | return retval; |
| 92 | } |
| 93 | |
| 94 | static void serio_disconnect_driver(struct serio *serio) |
| 95 | { |
| 96 | down(&serio->drv_sem); |
| 97 | if (serio->drv) |
| 98 | serio->drv->disconnect(serio); |
| 99 | up(&serio->drv_sem); |
| 100 | } |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
| 103 | { |
| 104 | while (ids->type || ids->proto) { |
| 105 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && |
| 106 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && |
| 107 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && |
| 108 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) |
| 109 | return 1; |
| 110 | ids++; |
| 111 | } |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * Basic serio -> driver core mappings |
| 117 | */ |
| 118 | |
| 119 | static void serio_bind_driver(struct serio *serio, struct serio_driver *drv) |
| 120 | { |
| 121 | down_write(&serio_bus.subsys.rwsem); |
| 122 | |
| 123 | if (serio_match_port(drv->id_table, serio)) { |
| 124 | serio->dev.driver = &drv->driver; |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 125 | if (serio_connect_driver(serio, drv)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | serio->dev.driver = NULL; |
| 127 | goto out; |
| 128 | } |
| 129 | device_bind_driver(&serio->dev); |
| 130 | } |
| 131 | out: |
| 132 | up_write(&serio_bus.subsys.rwsem); |
| 133 | } |
| 134 | |
| 135 | static void serio_release_driver(struct serio *serio) |
| 136 | { |
| 137 | down_write(&serio_bus.subsys.rwsem); |
| 138 | device_release_driver(&serio->dev); |
| 139 | up_write(&serio_bus.subsys.rwsem); |
| 140 | } |
| 141 | |
| 142 | static void serio_find_driver(struct serio *serio) |
| 143 | { |
| 144 | down_write(&serio_bus.subsys.rwsem); |
| 145 | device_attach(&serio->dev); |
| 146 | up_write(&serio_bus.subsys.rwsem); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | /* |
| 151 | * Serio event processing. |
| 152 | */ |
| 153 | |
| 154 | enum serio_event_type { |
| 155 | SERIO_RESCAN, |
| 156 | SERIO_RECONNECT, |
| 157 | SERIO_REGISTER_PORT, |
| 158 | SERIO_UNREGISTER_PORT, |
| 159 | SERIO_REGISTER_DRIVER, |
| 160 | }; |
| 161 | |
| 162 | struct serio_event { |
| 163 | enum serio_event_type type; |
| 164 | void *object; |
| 165 | struct module *owner; |
| 166 | struct list_head node; |
| 167 | }; |
| 168 | |
| 169 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ |
| 170 | static LIST_HEAD(serio_event_list); |
| 171 | static DECLARE_WAIT_QUEUE_HEAD(serio_wait); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 172 | static struct task_struct *serio_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | static void serio_queue_event(void *object, struct module *owner, |
| 175 | enum serio_event_type event_type) |
| 176 | { |
| 177 | unsigned long flags; |
| 178 | struct serio_event *event; |
| 179 | |
| 180 | spin_lock_irqsave(&serio_event_lock, flags); |
| 181 | |
| 182 | /* |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 183 | * Scan event list for the other events for the same serio port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | * starting with the most recent one. If event is the same we |
| 185 | * do not need add new one. If event is of different type we |
| 186 | * need to add this event and should not look further because |
| 187 | * we need to preseve sequence of distinct events. |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 188 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
| 190 | if (event->object == object) { |
| 191 | if (event->type == event_type) |
| 192 | goto out; |
| 193 | break; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) { |
| 198 | if (!try_module_get(owner)) { |
| 199 | printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type); |
| 200 | goto out; |
| 201 | } |
| 202 | |
| 203 | event->type = event_type; |
| 204 | event->object = object; |
| 205 | event->owner = owner; |
| 206 | |
| 207 | list_add_tail(&event->node, &serio_event_list); |
| 208 | wake_up(&serio_wait); |
| 209 | } else { |
| 210 | printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type); |
| 211 | } |
| 212 | out: |
| 213 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 214 | } |
| 215 | |
| 216 | static void serio_free_event(struct serio_event *event) |
| 217 | { |
| 218 | module_put(event->owner); |
| 219 | kfree(event); |
| 220 | } |
| 221 | |
| 222 | static void serio_remove_duplicate_events(struct serio_event *event) |
| 223 | { |
| 224 | struct list_head *node, *next; |
| 225 | struct serio_event *e; |
| 226 | unsigned long flags; |
| 227 | |
| 228 | spin_lock_irqsave(&serio_event_lock, flags); |
| 229 | |
| 230 | list_for_each_safe(node, next, &serio_event_list) { |
| 231 | e = list_entry(node, struct serio_event, node); |
| 232 | if (event->object == e->object) { |
| 233 | /* |
| 234 | * If this event is of different type we should not |
| 235 | * look further - we only suppress duplicate events |
| 236 | * that were sent back-to-back. |
| 237 | */ |
| 238 | if (event->type != e->type) |
| 239 | break; |
| 240 | |
| 241 | list_del_init(node); |
| 242 | serio_free_event(e); |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 247 | } |
| 248 | |
| 249 | |
| 250 | static struct serio_event *serio_get_event(void) |
| 251 | { |
| 252 | struct serio_event *event; |
| 253 | struct list_head *node; |
| 254 | unsigned long flags; |
| 255 | |
| 256 | spin_lock_irqsave(&serio_event_lock, flags); |
| 257 | |
| 258 | if (list_empty(&serio_event_list)) { |
| 259 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | node = serio_event_list.next; |
| 264 | event = list_entry(node, struct serio_event, node); |
| 265 | list_del_init(node); |
| 266 | |
| 267 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 268 | |
| 269 | return event; |
| 270 | } |
| 271 | |
Dmitry Torokhov | 9e50afd | 2005-11-20 00:56:43 -0500 | [diff] [blame] | 272 | static void serio_handle_event(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | { |
| 274 | struct serio_event *event; |
| 275 | struct serio_driver *serio_drv; |
| 276 | |
| 277 | down(&serio_sem); |
| 278 | |
Dmitry Torokhov | 9e50afd | 2005-11-20 00:56:43 -0500 | [diff] [blame] | 279 | /* |
| 280 | * Note that we handle only one event here to give swsusp |
| 281 | * a chance to freeze kseriod thread. Serio events should |
| 282 | * be pretty rare so we are not concerned about taking |
| 283 | * performance hit. |
| 284 | */ |
| 285 | if ((event = serio_get_event())) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | switch (event->type) { |
| 288 | case SERIO_REGISTER_PORT: |
| 289 | serio_add_port(event->object); |
| 290 | break; |
| 291 | |
| 292 | case SERIO_UNREGISTER_PORT: |
| 293 | serio_disconnect_port(event->object); |
| 294 | serio_destroy_port(event->object); |
| 295 | break; |
| 296 | |
| 297 | case SERIO_RECONNECT: |
| 298 | serio_reconnect_port(event->object); |
| 299 | break; |
| 300 | |
| 301 | case SERIO_RESCAN: |
| 302 | serio_disconnect_port(event->object); |
| 303 | serio_find_driver(event->object); |
| 304 | break; |
| 305 | |
| 306 | case SERIO_REGISTER_DRIVER: |
| 307 | serio_drv = event->object; |
| 308 | driver_register(&serio_drv->driver); |
| 309 | break; |
| 310 | |
| 311 | default: |
| 312 | break; |
| 313 | } |
| 314 | |
| 315 | serio_remove_duplicate_events(event); |
| 316 | serio_free_event(event); |
| 317 | } |
| 318 | |
| 319 | up(&serio_sem); |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Remove all events that have been submitted for a given serio port. |
| 324 | */ |
| 325 | static void serio_remove_pending_events(struct serio *serio) |
| 326 | { |
| 327 | struct list_head *node, *next; |
| 328 | struct serio_event *event; |
| 329 | unsigned long flags; |
| 330 | |
| 331 | spin_lock_irqsave(&serio_event_lock, flags); |
| 332 | |
| 333 | list_for_each_safe(node, next, &serio_event_list) { |
| 334 | event = list_entry(node, struct serio_event, node); |
| 335 | if (event->object == serio) { |
| 336 | list_del_init(node); |
| 337 | serio_free_event(event); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Destroy child serio port (if any) that has not been fully registered yet. |
| 346 | * |
| 347 | * Note that we rely on the fact that port can have only one child and therefore |
| 348 | * only one child registration request can be pending. Additionally, children |
| 349 | * are registered by driver's connect() handler so there can't be a grandchild |
| 350 | * pending registration together with a child. |
| 351 | */ |
| 352 | static struct serio *serio_get_pending_child(struct serio *parent) |
| 353 | { |
| 354 | struct serio_event *event; |
| 355 | struct serio *serio, *child = NULL; |
| 356 | unsigned long flags; |
| 357 | |
| 358 | spin_lock_irqsave(&serio_event_lock, flags); |
| 359 | |
| 360 | list_for_each_entry(event, &serio_event_list, node) { |
| 361 | if (event->type == SERIO_REGISTER_PORT) { |
| 362 | serio = event->object; |
| 363 | if (serio->parent == parent) { |
| 364 | child = serio; |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 371 | return child; |
| 372 | } |
| 373 | |
| 374 | static int serio_thread(void *nothing) |
| 375 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | do { |
Dmitry Torokhov | 9e50afd | 2005-11-20 00:56:43 -0500 | [diff] [blame] | 377 | serio_handle_event(); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 378 | wait_event_interruptible(serio_wait, |
| 379 | kthread_should_stop() || !list_empty(&serio_event_list)); |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 380 | try_to_freeze(); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 381 | } while (!kthread_should_stop()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | printk(KERN_DEBUG "serio: kseriod exiting\n"); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 384 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | |
| 388 | /* |
| 389 | * Serio port operations |
| 390 | */ |
| 391 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 392 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | { |
| 394 | struct serio *serio = to_serio_port(dev); |
| 395 | return sprintf(buf, "%s\n", serio->name); |
| 396 | } |
| 397 | |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 398 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
| 399 | { |
| 400 | struct serio *serio = to_serio_port(dev); |
| 401 | |
| 402 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", |
| 403 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
| 404 | } |
| 405 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 406 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | { |
| 408 | struct serio *serio = to_serio_port(dev); |
| 409 | return sprintf(buf, "%02x\n", serio->id.type); |
| 410 | } |
| 411 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 412 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | { |
| 414 | struct serio *serio = to_serio_port(dev); |
| 415 | return sprintf(buf, "%02x\n", serio->id.proto); |
| 416 | } |
| 417 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 418 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | { |
| 420 | struct serio *serio = to_serio_port(dev); |
| 421 | return sprintf(buf, "%02x\n", serio->id.id); |
| 422 | } |
| 423 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 424 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | { |
| 426 | struct serio *serio = to_serio_port(dev); |
| 427 | return sprintf(buf, "%02x\n", serio->id.extra); |
| 428 | } |
| 429 | |
Dmitry Torokhov | baae956 | 2005-05-16 21:53:09 -0700 | [diff] [blame] | 430 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
| 431 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); |
| 432 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); |
| 433 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); |
| 434 | |
| 435 | static struct attribute *serio_device_id_attrs[] = { |
| 436 | &dev_attr_type.attr, |
| 437 | &dev_attr_proto.attr, |
| 438 | &dev_attr_id.attr, |
| 439 | &dev_attr_extra.attr, |
| 440 | NULL |
| 441 | }; |
| 442 | |
| 443 | static struct attribute_group serio_id_attr_group = { |
| 444 | .name = "id", |
| 445 | .attrs = serio_device_id_attrs, |
| 446 | }; |
| 447 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 448 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | { |
| 450 | struct serio *serio = to_serio_port(dev); |
| 451 | struct device_driver *drv; |
| 452 | int retval; |
| 453 | |
| 454 | retval = down_interruptible(&serio_sem); |
| 455 | if (retval) |
| 456 | return retval; |
| 457 | |
| 458 | retval = count; |
| 459 | if (!strncmp(buf, "none", count)) { |
| 460 | serio_disconnect_port(serio); |
| 461 | } else if (!strncmp(buf, "reconnect", count)) { |
| 462 | serio_reconnect_port(serio); |
| 463 | } else if (!strncmp(buf, "rescan", count)) { |
| 464 | serio_disconnect_port(serio); |
| 465 | serio_find_driver(serio); |
| 466 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { |
| 467 | serio_disconnect_port(serio); |
| 468 | serio_bind_driver(serio, to_serio_driver(drv)); |
| 469 | put_driver(drv); |
| 470 | } else { |
| 471 | retval = -EINVAL; |
| 472 | } |
| 473 | |
| 474 | up(&serio_sem); |
| 475 | |
| 476 | return retval; |
| 477 | } |
| 478 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 479 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | { |
| 481 | struct serio *serio = to_serio_port(dev); |
| 482 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); |
| 483 | } |
| 484 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 485 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
| 487 | struct serio *serio = to_serio_port(dev); |
| 488 | int retval; |
| 489 | |
| 490 | retval = count; |
| 491 | if (!strncmp(buf, "manual", count)) { |
| 492 | serio->manual_bind = 1; |
| 493 | } else if (!strncmp(buf, "auto", count)) { |
| 494 | serio->manual_bind = 0; |
| 495 | } else { |
| 496 | retval = -EINVAL; |
| 497 | } |
| 498 | |
| 499 | return retval; |
| 500 | } |
| 501 | |
| 502 | static struct device_attribute serio_device_attrs[] = { |
| 503 | __ATTR(description, S_IRUGO, serio_show_description, NULL), |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 504 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
| 506 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), |
| 507 | __ATTR_NULL |
| 508 | }; |
| 509 | |
| 510 | |
| 511 | static void serio_release_port(struct device *dev) |
| 512 | { |
| 513 | struct serio *serio = to_serio_port(dev); |
| 514 | |
| 515 | kfree(serio); |
| 516 | module_put(THIS_MODULE); |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * Prepare serio port for registration. |
| 521 | */ |
| 522 | static void serio_init_port(struct serio *serio) |
| 523 | { |
| 524 | static atomic_t serio_no = ATOMIC_INIT(0); |
| 525 | |
| 526 | __module_get(THIS_MODULE); |
| 527 | |
| 528 | spin_lock_init(&serio->lock); |
| 529 | init_MUTEX(&serio->drv_sem); |
| 530 | device_initialize(&serio->dev); |
| 531 | snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id), |
| 532 | "serio%ld", (long)atomic_inc_return(&serio_no) - 1); |
| 533 | serio->dev.bus = &serio_bus; |
| 534 | serio->dev.release = serio_release_port; |
| 535 | if (serio->parent) |
| 536 | serio->dev.parent = &serio->parent->dev; |
| 537 | } |
| 538 | |
| 539 | /* |
| 540 | * Complete serio port registration. |
| 541 | * Driver core will attempt to find appropriate driver for the port. |
| 542 | */ |
| 543 | static void serio_add_port(struct serio *serio) |
| 544 | { |
| 545 | if (serio->parent) { |
| 546 | serio_pause_rx(serio->parent); |
| 547 | serio->parent->child = serio; |
| 548 | serio_continue_rx(serio->parent); |
| 549 | } |
| 550 | |
| 551 | list_add_tail(&serio->node, &serio_list); |
| 552 | if (serio->start) |
| 553 | serio->start(serio); |
| 554 | device_add(&serio->dev); |
Dmitry Torokhov | baae956 | 2005-05-16 21:53:09 -0700 | [diff] [blame] | 555 | sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | serio->registered = 1; |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * serio_destroy_port() completes deregistration process and removes |
| 561 | * port from the system |
| 562 | */ |
| 563 | static void serio_destroy_port(struct serio *serio) |
| 564 | { |
| 565 | struct serio *child; |
| 566 | |
| 567 | child = serio_get_pending_child(serio); |
| 568 | if (child) { |
| 569 | serio_remove_pending_events(child); |
| 570 | put_device(&child->dev); |
| 571 | } |
| 572 | |
| 573 | if (serio->stop) |
| 574 | serio->stop(serio); |
| 575 | |
| 576 | if (serio->parent) { |
| 577 | serio_pause_rx(serio->parent); |
| 578 | serio->parent->child = NULL; |
| 579 | serio_continue_rx(serio->parent); |
| 580 | serio->parent = NULL; |
| 581 | } |
| 582 | |
| 583 | if (serio->registered) { |
Dmitry Torokhov | baae956 | 2005-05-16 21:53:09 -0700 | [diff] [blame] | 584 | sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | device_del(&serio->dev); |
| 586 | list_del_init(&serio->node); |
| 587 | serio->registered = 0; |
| 588 | } |
| 589 | |
| 590 | serio_remove_pending_events(serio); |
| 591 | put_device(&serio->dev); |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * Reconnect serio port and all its children (re-initialize attached devices) |
| 596 | */ |
| 597 | static void serio_reconnect_port(struct serio *serio) |
| 598 | { |
| 599 | do { |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 600 | if (serio_reconnect_driver(serio)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | serio_disconnect_port(serio); |
| 602 | serio_find_driver(serio); |
| 603 | /* Ok, old children are now gone, we are done */ |
| 604 | break; |
| 605 | } |
| 606 | serio = serio->child; |
| 607 | } while (serio); |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * serio_disconnect_port() unbinds a port from its driver. As a side effect |
| 612 | * all child ports are unbound and destroyed. |
| 613 | */ |
| 614 | static void serio_disconnect_port(struct serio *serio) |
| 615 | { |
| 616 | struct serio *s, *parent; |
| 617 | |
| 618 | if (serio->child) { |
| 619 | /* |
| 620 | * Children ports should be disconnected and destroyed |
| 621 | * first, staring with the leaf one, since we don't want |
| 622 | * to do recursion |
| 623 | */ |
| 624 | for (s = serio; s->child; s = s->child) |
| 625 | /* empty */; |
| 626 | |
| 627 | do { |
| 628 | parent = s->parent; |
| 629 | |
| 630 | serio_release_driver(s); |
| 631 | serio_destroy_port(s); |
| 632 | } while ((s = parent) != serio); |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Ok, no children left, now disconnect this port |
| 637 | */ |
| 638 | serio_release_driver(serio); |
| 639 | } |
| 640 | |
| 641 | void serio_rescan(struct serio *serio) |
| 642 | { |
| 643 | serio_queue_event(serio, NULL, SERIO_RESCAN); |
| 644 | } |
| 645 | |
| 646 | void serio_reconnect(struct serio *serio) |
| 647 | { |
| 648 | serio_queue_event(serio, NULL, SERIO_RECONNECT); |
| 649 | } |
| 650 | |
| 651 | /* |
| 652 | * Submits register request to kseriod for subsequent execution. |
| 653 | * Note that port registration is always asynchronous. |
| 654 | */ |
| 655 | void __serio_register_port(struct serio *serio, struct module *owner) |
| 656 | { |
| 657 | serio_init_port(serio); |
| 658 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * Synchronously unregisters serio port. |
| 663 | */ |
| 664 | void serio_unregister_port(struct serio *serio) |
| 665 | { |
| 666 | down(&serio_sem); |
| 667 | serio_disconnect_port(serio); |
| 668 | serio_destroy_port(serio); |
| 669 | up(&serio_sem); |
| 670 | } |
| 671 | |
| 672 | /* |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 673 | * Safely unregisters child port if one is present. |
| 674 | */ |
| 675 | void serio_unregister_child_port(struct serio *serio) |
| 676 | { |
| 677 | down(&serio_sem); |
| 678 | if (serio->child) { |
| 679 | serio_disconnect_port(serio->child); |
| 680 | serio_destroy_port(serio->child); |
| 681 | } |
| 682 | up(&serio_sem); |
| 683 | } |
| 684 | |
| 685 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | * Submits register request to kseriod for subsequent execution. |
| 687 | * Can be used when it is not obvious whether the serio_sem is |
| 688 | * taken or not and when delayed execution is feasible. |
| 689 | */ |
| 690 | void __serio_unregister_port_delayed(struct serio *serio, struct module *owner) |
| 691 | { |
| 692 | serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT); |
| 693 | } |
| 694 | |
| 695 | |
| 696 | /* |
| 697 | * Serio driver operations |
| 698 | */ |
| 699 | |
| 700 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) |
| 701 | { |
| 702 | struct serio_driver *driver = to_serio_driver(drv); |
| 703 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); |
| 704 | } |
| 705 | |
| 706 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) |
| 707 | { |
| 708 | struct serio_driver *serio_drv = to_serio_driver(drv); |
| 709 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); |
| 710 | } |
| 711 | |
| 712 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) |
| 713 | { |
| 714 | struct serio_driver *serio_drv = to_serio_driver(drv); |
| 715 | int retval; |
| 716 | |
| 717 | retval = count; |
| 718 | if (!strncmp(buf, "manual", count)) { |
| 719 | serio_drv->manual_bind = 1; |
| 720 | } else if (!strncmp(buf, "auto", count)) { |
| 721 | serio_drv->manual_bind = 0; |
| 722 | } else { |
| 723 | retval = -EINVAL; |
| 724 | } |
| 725 | |
| 726 | return retval; |
| 727 | } |
| 728 | |
| 729 | |
| 730 | static struct driver_attribute serio_driver_attrs[] = { |
| 731 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), |
| 732 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, |
| 733 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), |
| 734 | __ATTR_NULL |
| 735 | }; |
| 736 | |
| 737 | static int serio_driver_probe(struct device *dev) |
| 738 | { |
| 739 | struct serio *serio = to_serio_port(dev); |
| 740 | struct serio_driver *drv = to_serio_driver(dev->driver); |
| 741 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 742 | return serio_connect_driver(serio, drv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | static int serio_driver_remove(struct device *dev) |
| 746 | { |
| 747 | struct serio *serio = to_serio_port(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 749 | serio_disconnect_driver(serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return 0; |
| 751 | } |
| 752 | |
| 753 | void __serio_register_driver(struct serio_driver *drv, struct module *owner) |
| 754 | { |
| 755 | drv->driver.bus = &serio_bus; |
| 756 | drv->driver.probe = serio_driver_probe; |
| 757 | drv->driver.remove = serio_driver_remove; |
| 758 | |
| 759 | serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER); |
| 760 | } |
| 761 | |
| 762 | void serio_unregister_driver(struct serio_driver *drv) |
| 763 | { |
| 764 | struct serio *serio; |
| 765 | |
| 766 | down(&serio_sem); |
| 767 | drv->manual_bind = 1; /* so serio_find_driver ignores it */ |
| 768 | |
| 769 | start_over: |
| 770 | list_for_each_entry(serio, &serio_list, node) { |
| 771 | if (serio->drv == drv) { |
| 772 | serio_disconnect_port(serio); |
| 773 | serio_find_driver(serio); |
| 774 | /* we could've deleted some ports, restart */ |
| 775 | goto start_over; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | driver_unregister(&drv->driver); |
| 780 | up(&serio_sem); |
| 781 | } |
| 782 | |
| 783 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) |
| 784 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | serio_pause_rx(serio); |
| 786 | serio->drv = drv; |
| 787 | serio_continue_rx(serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | static int serio_bus_match(struct device *dev, struct device_driver *drv) |
| 791 | { |
| 792 | struct serio *serio = to_serio_port(dev); |
| 793 | struct serio_driver *serio_drv = to_serio_driver(drv); |
| 794 | |
| 795 | if (serio->manual_bind || serio_drv->manual_bind) |
| 796 | return 0; |
| 797 | |
| 798 | return serio_match_port(serio_drv->id_table, serio); |
| 799 | } |
| 800 | |
| 801 | #ifdef CONFIG_HOTPLUG |
| 802 | |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 803 | #define SERIO_ADD_HOTPLUG_VAR(fmt, val...) \ |
| 804 | do { \ |
| 805 | int err = add_hotplug_env_var(envp, num_envp, &i, \ |
| 806 | buffer, buffer_size, &len, \ |
| 807 | fmt, val); \ |
| 808 | if (err) \ |
| 809 | return err; \ |
| 810 | } while (0) |
| 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
| 813 | { |
| 814 | struct serio *serio; |
| 815 | int i = 0; |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 816 | int len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
| 818 | if (!dev) |
| 819 | return -ENODEV; |
| 820 | |
| 821 | serio = to_serio_port(dev); |
| 822 | |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 823 | SERIO_ADD_HOTPLUG_VAR("SERIO_TYPE=%02x", serio->id.type); |
| 824 | SERIO_ADD_HOTPLUG_VAR("SERIO_PROTO=%02x", serio->id.proto); |
| 825 | SERIO_ADD_HOTPLUG_VAR("SERIO_ID=%02x", serio->id.id); |
| 826 | SERIO_ADD_HOTPLUG_VAR("SERIO_EXTRA=%02x", serio->id.extra); |
| 827 | SERIO_ADD_HOTPLUG_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", |
| 828 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | envp[i] = NULL; |
| 830 | |
| 831 | return 0; |
| 832 | } |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 833 | #undef SERIO_ADD_HOTPLUG_VAR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
| 835 | #else |
| 836 | |
| 837 | static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
| 838 | { |
| 839 | return -ENODEV; |
| 840 | } |
| 841 | |
| 842 | #endif /* CONFIG_HOTPLUG */ |
| 843 | |
| 844 | static int serio_resume(struct device *dev) |
| 845 | { |
| 846 | struct serio *serio = to_serio_port(dev); |
| 847 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 848 | if (serio_reconnect_driver(serio)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | /* |
| 850 | * Driver re-probing can take a while, so better let kseriod |
| 851 | * deal with it. |
| 852 | */ |
| 853 | serio_rescan(serio); |
| 854 | } |
| 855 | |
| 856 | return 0; |
| 857 | } |
| 858 | |
| 859 | /* called from serio_driver->connect/disconnect methods under serio_sem */ |
| 860 | int serio_open(struct serio *serio, struct serio_driver *drv) |
| 861 | { |
| 862 | serio_set_drv(serio, drv); |
| 863 | |
| 864 | if (serio->open && serio->open(serio)) { |
| 865 | serio_set_drv(serio, NULL); |
| 866 | return -1; |
| 867 | } |
| 868 | return 0; |
| 869 | } |
| 870 | |
| 871 | /* called from serio_driver->connect/disconnect methods under serio_sem */ |
| 872 | void serio_close(struct serio *serio) |
| 873 | { |
| 874 | if (serio->close) |
| 875 | serio->close(serio); |
| 876 | |
| 877 | serio_set_drv(serio, NULL); |
| 878 | } |
| 879 | |
| 880 | irqreturn_t serio_interrupt(struct serio *serio, |
| 881 | unsigned char data, unsigned int dfl, struct pt_regs *regs) |
| 882 | { |
| 883 | unsigned long flags; |
| 884 | irqreturn_t ret = IRQ_NONE; |
| 885 | |
| 886 | spin_lock_irqsave(&serio->lock, flags); |
| 887 | |
| 888 | if (likely(serio->drv)) { |
| 889 | ret = serio->drv->interrupt(serio, data, dfl, regs); |
| 890 | } else if (!dfl && serio->registered) { |
| 891 | serio_rescan(serio); |
| 892 | ret = IRQ_HANDLED; |
| 893 | } |
| 894 | |
| 895 | spin_unlock_irqrestore(&serio->lock, flags); |
| 896 | |
| 897 | return ret; |
| 898 | } |
| 899 | |
| 900 | static int __init serio_init(void) |
| 901 | { |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 902 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); |
| 903 | if (IS_ERR(serio_task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | printk(KERN_ERR "serio: Failed to start kseriod\n"); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 905 | return PTR_ERR(serio_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
| 907 | |
| 908 | serio_bus.dev_attrs = serio_device_attrs; |
| 909 | serio_bus.drv_attrs = serio_driver_attrs; |
| 910 | serio_bus.match = serio_bus_match; |
| 911 | serio_bus.hotplug = serio_hotplug; |
| 912 | serio_bus.resume = serio_resume; |
| 913 | bus_register(&serio_bus); |
| 914 | |
| 915 | return 0; |
| 916 | } |
| 917 | |
| 918 | static void __exit serio_exit(void) |
| 919 | { |
| 920 | bus_unregister(&serio_bus); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 921 | kthread_stop(serio_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
| 923 | |
| 924 | module_init(serio_init); |
| 925 | module_exit(serio_exit); |