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 | |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/stddef.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/serio.h> |
| 34 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/slab.h> |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 37 | #include <linux/workqueue.h> |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 38 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 41 | MODULE_DESCRIPTION("Serio abstraction core"); |
| 42 | MODULE_LICENSE("GPL"); |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | /* |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 45 | * serio_mutex protects entire serio subsystem and is taken every time |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 46 | * serio port or driver registered or unregistered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | */ |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 48 | static DEFINE_MUTEX(serio_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | static LIST_HEAD(serio_list); |
| 51 | |
Russell King | 30226f8 | 2006-01-05 14:38:53 +0000 | [diff] [blame] | 52 | static struct bus_type serio_bus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | static void serio_add_port(struct serio *serio); |
Shaohua Li | 6aabcdf | 2008-07-03 10:45:38 -0400 | [diff] [blame] | 55 | static int serio_reconnect_port(struct serio *serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | static void serio_disconnect_port(struct serio *serio); |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 57 | static void serio_reconnect_subtree(struct serio *serio); |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 58 | static void serio_attach_driver(struct serio_driver *drv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 60 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
| 61 | { |
| 62 | int retval; |
| 63 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 64 | mutex_lock(&serio->drv_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 65 | retval = drv->connect(serio, drv); |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 66 | mutex_unlock(&serio->drv_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 67 | |
| 68 | return retval; |
| 69 | } |
| 70 | |
| 71 | static int serio_reconnect_driver(struct serio *serio) |
| 72 | { |
| 73 | int retval = -1; |
| 74 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 75 | mutex_lock(&serio->drv_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 76 | if (serio->drv && serio->drv->reconnect) |
| 77 | retval = serio->drv->reconnect(serio); |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 78 | mutex_unlock(&serio->drv_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 79 | |
| 80 | return retval; |
| 81 | } |
| 82 | |
| 83 | static void serio_disconnect_driver(struct serio *serio) |
| 84 | { |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 85 | mutex_lock(&serio->drv_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 86 | if (serio->drv) |
| 87 | serio->drv->disconnect(serio); |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 88 | mutex_unlock(&serio->drv_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 89 | } |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
| 92 | { |
| 93 | while (ids->type || ids->proto) { |
| 94 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && |
| 95 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && |
| 96 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && |
| 97 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) |
| 98 | return 1; |
| 99 | ids++; |
| 100 | } |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Basic serio -> driver core mappings |
| 106 | */ |
| 107 | |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 108 | static int serio_bind_driver(struct serio *serio, struct serio_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
Dmitry Torokhov | 0a66045 | 2006-10-12 01:06:23 -0400 | [diff] [blame] | 110 | int error; |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | if (serio_match_port(drv->id_table, serio)) { |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | serio->dev.driver = &drv->driver; |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 115 | if (serio_connect_driver(serio, drv)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | serio->dev.driver = NULL; |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 117 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 119 | |
Dmitry Torokhov | 0a66045 | 2006-10-12 01:06:23 -0400 | [diff] [blame] | 120 | error = device_bind_driver(&serio->dev); |
| 121 | if (error) { |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 122 | dev_warn(&serio->dev, |
| 123 | "device_bind_driver() failed for %s (%s) and %s, error: %d\n", |
| 124 | serio->phys, serio->name, |
| 125 | drv->description, error); |
Dmitry Torokhov | 0a66045 | 2006-10-12 01:06:23 -0400 | [diff] [blame] | 126 | serio_disconnect_driver(serio); |
| 127 | serio->dev.driver = NULL; |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 128 | return error; |
Dmitry Torokhov | 0a66045 | 2006-10-12 01:06:23 -0400 | [diff] [blame] | 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 131 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static void serio_find_driver(struct serio *serio) |
| 135 | { |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 136 | int error; |
| 137 | |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 138 | error = device_attach(&serio->dev); |
| 139 | if (error < 0) |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 140 | dev_warn(&serio->dev, |
| 141 | "device_attach() failed for %s (%s), error: %d\n", |
| 142 | serio->phys, serio->name, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | |
| 146 | /* |
| 147 | * Serio event processing. |
| 148 | */ |
| 149 | |
| 150 | enum serio_event_type { |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 151 | SERIO_RESCAN_PORT, |
| 152 | SERIO_RECONNECT_PORT, |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 153 | SERIO_RECONNECT_SUBTREE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | SERIO_REGISTER_PORT, |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 155 | SERIO_ATTACH_DRIVER, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | }; |
| 157 | |
| 158 | struct serio_event { |
| 159 | enum serio_event_type type; |
| 160 | void *object; |
| 161 | struct module *owner; |
| 162 | struct list_head node; |
| 163 | }; |
| 164 | |
| 165 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ |
| 166 | static LIST_HEAD(serio_event_list); |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 167 | |
| 168 | static struct serio_event *serio_get_event(void) |
| 169 | { |
| 170 | struct serio_event *event = NULL; |
| 171 | unsigned long flags; |
| 172 | |
| 173 | spin_lock_irqsave(&serio_event_lock, flags); |
| 174 | |
| 175 | if (!list_empty(&serio_event_list)) { |
| 176 | event = list_first_entry(&serio_event_list, |
| 177 | struct serio_event, node); |
| 178 | list_del_init(&event->node); |
| 179 | } |
| 180 | |
| 181 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 182 | return event; |
| 183 | } |
| 184 | |
| 185 | static void serio_free_event(struct serio_event *event) |
| 186 | { |
| 187 | module_put(event->owner); |
| 188 | kfree(event); |
| 189 | } |
| 190 | |
Duncan Laurie | 19e9554 | 2011-02-02 22:59:54 -0800 | [diff] [blame] | 191 | static void serio_remove_duplicate_events(void *object, |
| 192 | enum serio_event_type type) |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 193 | { |
| 194 | struct serio_event *e, *next; |
| 195 | unsigned long flags; |
| 196 | |
| 197 | spin_lock_irqsave(&serio_event_lock, flags); |
| 198 | |
| 199 | list_for_each_entry_safe(e, next, &serio_event_list, node) { |
Duncan Laurie | 19e9554 | 2011-02-02 22:59:54 -0800 | [diff] [blame] | 200 | if (object == e->object) { |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 201 | /* |
| 202 | * If this event is of different type we should not |
| 203 | * look further - we only suppress duplicate events |
| 204 | * that were sent back-to-back. |
| 205 | */ |
Duncan Laurie | 19e9554 | 2011-02-02 22:59:54 -0800 | [diff] [blame] | 206 | if (type != e->type) |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 207 | break; |
| 208 | |
| 209 | list_del_init(&e->node); |
| 210 | serio_free_event(e); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 215 | } |
| 216 | |
| 217 | static void serio_handle_event(struct work_struct *work) |
| 218 | { |
| 219 | struct serio_event *event; |
| 220 | |
| 221 | mutex_lock(&serio_mutex); |
| 222 | |
| 223 | while ((event = serio_get_event())) { |
| 224 | |
| 225 | switch (event->type) { |
| 226 | |
| 227 | case SERIO_REGISTER_PORT: |
| 228 | serio_add_port(event->object); |
| 229 | break; |
| 230 | |
| 231 | case SERIO_RECONNECT_PORT: |
| 232 | serio_reconnect_port(event->object); |
| 233 | break; |
| 234 | |
| 235 | case SERIO_RESCAN_PORT: |
| 236 | serio_disconnect_port(event->object); |
| 237 | serio_find_driver(event->object); |
| 238 | break; |
| 239 | |
| 240 | case SERIO_RECONNECT_SUBTREE: |
| 241 | serio_reconnect_subtree(event->object); |
| 242 | break; |
| 243 | |
| 244 | case SERIO_ATTACH_DRIVER: |
| 245 | serio_attach_driver(event->object); |
| 246 | break; |
| 247 | } |
| 248 | |
Duncan Laurie | 19e9554 | 2011-02-02 22:59:54 -0800 | [diff] [blame] | 249 | serio_remove_duplicate_events(event->object, event->type); |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 250 | serio_free_event(event); |
| 251 | } |
| 252 | |
| 253 | mutex_unlock(&serio_mutex); |
| 254 | } |
| 255 | |
| 256 | static DECLARE_WORK(serio_event_work, serio_handle_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 258 | static int serio_queue_event(void *object, struct module *owner, |
| 259 | enum serio_event_type event_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | { |
| 261 | unsigned long flags; |
| 262 | struct serio_event *event; |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 263 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
| 265 | spin_lock_irqsave(&serio_event_lock, flags); |
| 266 | |
| 267 | /* |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 268 | * Scan event list for the other events for the same serio port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | * starting with the most recent one. If event is the same we |
| 270 | * do not need add new one. If event is of different type we |
| 271 | * need to add this event and should not look further because |
| 272 | * we need to preseve sequence of distinct events. |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 273 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
| 275 | if (event->object == object) { |
| 276 | if (event->type == event_type) |
| 277 | goto out; |
| 278 | break; |
| 279 | } |
| 280 | } |
| 281 | |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 282 | event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); |
| 283 | if (!event) { |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 284 | pr_err("Not enough memory to queue event %d\n", event_type); |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 285 | retval = -ENOMEM; |
| 286 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | } |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 288 | |
| 289 | if (!try_module_get(owner)) { |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 290 | pr_warning("Can't get module reference, dropping event %d\n", |
| 291 | event_type); |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 292 | kfree(event); |
| 293 | retval = -EINVAL; |
| 294 | goto out; |
| 295 | } |
| 296 | |
| 297 | event->type = event_type; |
| 298 | event->object = object; |
| 299 | event->owner = owner; |
| 300 | |
| 301 | list_add_tail(&event->node, &serio_event_list); |
Dmitry Torokhov | 1d64b65 | 2011-02-23 08:51:28 -0800 | [diff] [blame] | 302 | queue_work(system_long_wq, &serio_event_work); |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | out: |
| 305 | spin_unlock_irqrestore(&serio_event_lock, flags); |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 306 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | /* |
Dmitry Torokhov | e8ef434 | 2008-06-02 00:41:57 -0400 | [diff] [blame] | 310 | * Remove all events that have been submitted for a given |
| 311 | * object, be it serio port or driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | */ |
Dmitry Torokhov | e8ef434 | 2008-06-02 00:41:57 -0400 | [diff] [blame] | 313 | static void serio_remove_pending_events(void *object) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | { |
Dmitry Torokhov | 4516c81 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 315 | struct serio_event *event, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | unsigned long flags; |
| 317 | |
| 318 | spin_lock_irqsave(&serio_event_lock, flags); |
| 319 | |
Dmitry Torokhov | 4516c81 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 320 | list_for_each_entry_safe(event, next, &serio_event_list, node) { |
Dmitry Torokhov | e8ef434 | 2008-06-02 00:41:57 -0400 | [diff] [blame] | 321 | if (event->object == object) { |
Dmitry Torokhov | 4516c81 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 322 | list_del_init(&event->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | serio_free_event(event); |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 328 | } |
| 329 | |
| 330 | /* |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 331 | * Locate child serio port (if any) that has not been fully registered yet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | * |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 333 | * Children are registered by driver's connect() handler so there can't be a |
| 334 | * grandchild pending registration together with a child. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | */ |
| 336 | static struct serio *serio_get_pending_child(struct serio *parent) |
| 337 | { |
| 338 | struct serio_event *event; |
| 339 | struct serio *serio, *child = NULL; |
| 340 | unsigned long flags; |
| 341 | |
| 342 | spin_lock_irqsave(&serio_event_lock, flags); |
| 343 | |
| 344 | list_for_each_entry(event, &serio_event_list, node) { |
| 345 | if (event->type == SERIO_REGISTER_PORT) { |
| 346 | serio = event->object; |
| 347 | if (serio->parent == parent) { |
| 348 | child = serio; |
| 349 | break; |
| 350 | } |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | spin_unlock_irqrestore(&serio_event_lock, flags); |
| 355 | return child; |
| 356 | } |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | /* |
| 359 | * Serio port operations |
| 360 | */ |
| 361 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 362 | 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] | 363 | { |
| 364 | struct serio *serio = to_serio_port(dev); |
| 365 | return sprintf(buf, "%s\n", serio->name); |
| 366 | } |
| 367 | |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 368 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 369 | { |
| 370 | struct serio *serio = to_serio_port(dev); |
| 371 | |
| 372 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", |
| 373 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
| 374 | } |
| 375 | |
Greg Kroah-Hartman | 7eab8de | 2013-10-07 18:08:23 -0700 | [diff] [blame] | 376 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | { |
| 378 | struct serio *serio = to_serio_port(dev); |
| 379 | return sprintf(buf, "%02x\n", serio->id.type); |
| 380 | } |
| 381 | |
Greg Kroah-Hartman | 7eab8de | 2013-10-07 18:08:23 -0700 | [diff] [blame] | 382 | static ssize_t proto_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
| 384 | struct serio *serio = to_serio_port(dev); |
| 385 | return sprintf(buf, "%02x\n", serio->id.proto); |
| 386 | } |
| 387 | |
Greg Kroah-Hartman | 7eab8de | 2013-10-07 18:08:23 -0700 | [diff] [blame] | 388 | static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
| 390 | struct serio *serio = to_serio_port(dev); |
| 391 | return sprintf(buf, "%02x\n", serio->id.id); |
| 392 | } |
| 393 | |
Greg Kroah-Hartman | 7eab8de | 2013-10-07 18:08:23 -0700 | [diff] [blame] | 394 | static ssize_t extra_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
| 396 | struct serio *serio = to_serio_port(dev); |
| 397 | return sprintf(buf, "%02x\n", serio->id.extra); |
| 398 | } |
| 399 | |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 400 | static ssize_t drvctl_store(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] | 401 | { |
| 402 | struct serio *serio = to_serio_port(dev); |
| 403 | struct device_driver *drv; |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 404 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 406 | error = mutex_lock_interruptible(&serio_mutex); |
| 407 | if (error) |
| 408 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (!strncmp(buf, "none", count)) { |
| 411 | serio_disconnect_port(serio); |
| 412 | } else if (!strncmp(buf, "reconnect", count)) { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 413 | serio_reconnect_subtree(serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } else if (!strncmp(buf, "rescan", count)) { |
| 415 | serio_disconnect_port(serio); |
| 416 | serio_find_driver(serio); |
Duncan Laurie | 19e9554 | 2011-02-02 22:59:54 -0800 | [diff] [blame] | 417 | serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { |
| 419 | serio_disconnect_port(serio); |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 420 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
Duncan Laurie | 19e9554 | 2011-02-02 22:59:54 -0800 | [diff] [blame] | 421 | serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | } else { |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 423 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 426 | mutex_unlock(&serio_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 428 | return error ? error : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
| 430 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 431 | 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] | 432 | { |
| 433 | struct serio *serio = to_serio_port(dev); |
| 434 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); |
| 435 | } |
| 436 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 437 | 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] | 438 | { |
| 439 | struct serio *serio = to_serio_port(dev); |
| 440 | int retval; |
| 441 | |
| 442 | retval = count; |
| 443 | if (!strncmp(buf, "manual", count)) { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 444 | serio->manual_bind = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } else if (!strncmp(buf, "auto", count)) { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 446 | serio->manual_bind = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } else { |
| 448 | retval = -EINVAL; |
| 449 | } |
| 450 | |
| 451 | return retval; |
| 452 | } |
| 453 | |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 454 | static DEVICE_ATTR_RO(type); |
| 455 | static DEVICE_ATTR_RO(proto); |
| 456 | static DEVICE_ATTR_RO(id); |
| 457 | static DEVICE_ATTR_RO(extra); |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 458 | |
| 459 | static struct attribute *serio_device_id_attrs[] = { |
| 460 | &dev_attr_type.attr, |
| 461 | &dev_attr_proto.attr, |
| 462 | &dev_attr_id.attr, |
| 463 | &dev_attr_extra.attr, |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 464 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | }; |
| 466 | |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 467 | static struct attribute_group serio_id_attr_group = { |
| 468 | .name = "id", |
| 469 | .attrs = serio_device_id_attrs, |
| 470 | }; |
| 471 | |
Dmitry Torokhov | e696c68 | 2013-12-07 07:13:56 -0800 | [diff] [blame] | 472 | static DEVICE_ATTR_RO(modalias); |
| 473 | static DEVICE_ATTR_WO(drvctl); |
| 474 | static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL); |
| 475 | static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode); |
| 476 | |
| 477 | static struct attribute *serio_device_attrs[] = { |
| 478 | &dev_attr_modalias.attr, |
| 479 | &dev_attr_description.attr, |
| 480 | &dev_attr_drvctl.attr, |
| 481 | &dev_attr_bind_mode.attr, |
| 482 | NULL |
| 483 | }; |
| 484 | |
| 485 | static struct attribute_group serio_device_attr_group = { |
| 486 | .attrs = serio_device_attrs, |
| 487 | }; |
| 488 | |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 489 | static const struct attribute_group *serio_device_attr_groups[] = { |
| 490 | &serio_id_attr_group, |
Dmitry Torokhov | e696c68 | 2013-12-07 07:13:56 -0800 | [diff] [blame] | 491 | &serio_device_attr_group, |
Greg Kroah-Hartman | 3778a212 | 2013-10-07 18:09:08 -0700 | [diff] [blame] | 492 | NULL |
| 493 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | static void serio_release_port(struct device *dev) |
| 496 | { |
| 497 | struct serio *serio = to_serio_port(dev); |
| 498 | |
| 499 | kfree(serio); |
| 500 | module_put(THIS_MODULE); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Prepare serio port for registration. |
| 505 | */ |
| 506 | static void serio_init_port(struct serio *serio) |
| 507 | { |
| 508 | static atomic_t serio_no = ATOMIC_INIT(0); |
| 509 | |
| 510 | __module_get(THIS_MODULE); |
| 511 | |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 512 | INIT_LIST_HEAD(&serio->node); |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 513 | INIT_LIST_HEAD(&serio->child_node); |
| 514 | INIT_LIST_HEAD(&serio->children); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | spin_lock_init(&serio->lock); |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 516 | mutex_init(&serio->drv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | device_initialize(&serio->dev); |
Kay Sievers | a6c2490 | 2008-10-30 00:07:50 -0400 | [diff] [blame] | 518 | dev_set_name(&serio->dev, "serio%ld", |
| 519 | (long)atomic_inc_return(&serio_no) - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | serio->dev.bus = &serio_bus; |
| 521 | serio->dev.release = serio_release_port; |
Dmitry Torokhov | 386d877 | 2010-01-05 17:56:03 -0800 | [diff] [blame] | 522 | serio->dev.groups = serio_device_attr_groups; |
Jiri Kosina | 88aa010 | 2006-10-11 01:45:31 -0400 | [diff] [blame] | 523 | if (serio->parent) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | serio->dev.parent = &serio->parent->dev; |
Jiri Kosina | 88aa010 | 2006-10-11 01:45:31 -0400 | [diff] [blame] | 525 | serio->depth = serio->parent->depth + 1; |
| 526 | } else |
| 527 | serio->depth = 0; |
| 528 | lockdep_set_subclass(&serio->lock, serio->depth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Complete serio port registration. |
| 533 | * Driver core will attempt to find appropriate driver for the port. |
| 534 | */ |
| 535 | static void serio_add_port(struct serio *serio) |
| 536 | { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 537 | struct serio *parent = serio->parent; |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 538 | int error; |
| 539 | |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 540 | if (parent) { |
| 541 | serio_pause_rx(parent); |
| 542 | list_add_tail(&serio->child_node, &parent->children); |
| 543 | serio_continue_rx(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | } |
| 545 | |
| 546 | list_add_tail(&serio->node, &serio_list); |
Dmitry Torokhov | 386d877 | 2010-01-05 17:56:03 -0800 | [diff] [blame] | 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | if (serio->start) |
| 549 | serio->start(serio); |
Dmitry Torokhov | 386d877 | 2010-01-05 17:56:03 -0800 | [diff] [blame] | 550 | |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 551 | error = device_add(&serio->dev); |
| 552 | if (error) |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 553 | dev_err(&serio->dev, |
| 554 | "device_add() failed for %s (%s), error: %d\n", |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 555 | serio->phys, serio->name, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | /* |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 559 | * serio_destroy_port() completes unregistration process and removes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | * port from the system |
| 561 | */ |
| 562 | static void serio_destroy_port(struct serio *serio) |
| 563 | { |
| 564 | struct serio *child; |
| 565 | |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 566 | while ((child = serio_get_pending_child(serio)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | serio_remove_pending_events(child); |
| 568 | put_device(&child->dev); |
| 569 | } |
| 570 | |
| 571 | if (serio->stop) |
| 572 | serio->stop(serio); |
| 573 | |
| 574 | if (serio->parent) { |
| 575 | serio_pause_rx(serio->parent); |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 576 | list_del_init(&serio->child_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | serio_continue_rx(serio->parent); |
| 578 | serio->parent = NULL; |
| 579 | } |
| 580 | |
Dmitry Torokhov | ddf1ffb | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 581 | if (device_is_registered(&serio->dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | device_del(&serio->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 584 | list_del_init(&serio->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | serio_remove_pending_events(serio); |
| 586 | put_device(&serio->dev); |
| 587 | } |
| 588 | |
| 589 | /* |
Shaohua Li | 6aabcdf | 2008-07-03 10:45:38 -0400 | [diff] [blame] | 590 | * Reconnect serio port (re-initialize attached device). |
| 591 | * If reconnect fails (old device is no longer attached or |
| 592 | * there was no device to begin with) we do full rescan in |
| 593 | * hope of finding a driver for the port. |
| 594 | */ |
| 595 | static int serio_reconnect_port(struct serio *serio) |
| 596 | { |
| 597 | int error = serio_reconnect_driver(serio); |
| 598 | |
| 599 | if (error) { |
| 600 | serio_disconnect_port(serio); |
| 601 | serio_find_driver(serio); |
| 602 | } |
| 603 | |
| 604 | return error; |
| 605 | } |
| 606 | |
| 607 | /* |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 608 | * Reconnect serio port and all its children (re-initialize attached |
| 609 | * devices). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | */ |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 611 | static void serio_reconnect_subtree(struct serio *root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 613 | struct serio *s = root; |
| 614 | int error; |
| 615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | do { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 617 | error = serio_reconnect_port(s); |
| 618 | if (!error) { |
| 619 | /* |
| 620 | * Reconnect was successful, move on to do the |
| 621 | * first child. |
| 622 | */ |
| 623 | if (!list_empty(&s->children)) { |
| 624 | s = list_first_entry(&s->children, |
| 625 | struct serio, child_node); |
| 626 | continue; |
| 627 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | } |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 629 | |
| 630 | /* |
| 631 | * Either it was a leaf node or reconnect failed and it |
| 632 | * became a leaf node. Continue reconnecting starting with |
| 633 | * the next sibling of the parent node. |
| 634 | */ |
| 635 | while (s != root) { |
| 636 | struct serio *parent = s->parent; |
| 637 | |
| 638 | if (!list_is_last(&s->child_node, &parent->children)) { |
| 639 | s = list_entry(s->child_node.next, |
| 640 | struct serio, child_node); |
| 641 | break; |
| 642 | } |
| 643 | |
| 644 | s = parent; |
| 645 | } |
| 646 | } while (s != root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | /* |
| 650 | * serio_disconnect_port() unbinds a port from its driver. As a side effect |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 651 | * all children ports are unbound and destroyed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | */ |
| 653 | static void serio_disconnect_port(struct serio *serio) |
| 654 | { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 655 | struct serio *s = serio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 657 | /* |
| 658 | * Children ports should be disconnected and destroyed |
| 659 | * first; we travel the tree in depth-first order. |
| 660 | */ |
| 661 | while (!list_empty(&serio->children)) { |
| 662 | |
| 663 | /* Locate a leaf */ |
| 664 | while (!list_empty(&s->children)) |
| 665 | s = list_first_entry(&s->children, |
| 666 | struct serio, child_node); |
| 667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | /* |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 669 | * Prune this leaf node unless it is the one we |
| 670 | * started with. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | */ |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 672 | if (s != serio) { |
| 673 | struct serio *parent = s->parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 675 | device_release_driver(&s->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | serio_destroy_port(s); |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 677 | |
| 678 | s = parent; |
| 679 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | /* |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 683 | * OK, no children left, now disconnect this port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | */ |
Dmitry Torokhov | 70f256f | 2007-04-10 00:40:27 -0400 | [diff] [blame] | 685 | device_release_driver(&serio->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | } |
| 687 | |
| 688 | void serio_rescan(struct serio *serio) |
| 689 | { |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 690 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 692 | EXPORT_SYMBOL(serio_rescan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | void serio_reconnect(struct serio *serio) |
| 695 | { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 696 | serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 698 | EXPORT_SYMBOL(serio_reconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | /* |
| 701 | * Submits register request to kseriod for subsequent execution. |
| 702 | * Note that port registration is always asynchronous. |
| 703 | */ |
| 704 | void __serio_register_port(struct serio *serio, struct module *owner) |
| 705 | { |
| 706 | serio_init_port(serio); |
| 707 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); |
| 708 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 709 | EXPORT_SYMBOL(__serio_register_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | /* |
| 712 | * Synchronously unregisters serio port. |
| 713 | */ |
| 714 | void serio_unregister_port(struct serio *serio) |
| 715 | { |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 716 | mutex_lock(&serio_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | serio_disconnect_port(serio); |
| 718 | serio_destroy_port(serio); |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 719 | mutex_unlock(&serio_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 721 | EXPORT_SYMBOL(serio_unregister_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
| 723 | /* |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 724 | * Safely unregisters children ports if they are present. |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 725 | */ |
| 726 | void serio_unregister_child_port(struct serio *serio) |
| 727 | { |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 728 | struct serio *s, *next; |
| 729 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 730 | mutex_lock(&serio_mutex); |
Dmitry Eremin-Solenikov | 0982258 | 2010-10-04 21:46:10 -0700 | [diff] [blame] | 731 | list_for_each_entry_safe(s, next, &serio->children, child_node) { |
| 732 | serio_disconnect_port(s); |
| 733 | serio_destroy_port(s); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 734 | } |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 735 | mutex_unlock(&serio_mutex); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 736 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 737 | EXPORT_SYMBOL(serio_unregister_child_port); |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
| 740 | /* |
| 741 | * Serio driver operations |
| 742 | */ |
| 743 | |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 744 | static ssize_t description_show(struct device_driver *drv, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | { |
| 746 | struct serio_driver *driver = to_serio_driver(drv); |
| 747 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); |
| 748 | } |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 749 | static DRIVER_ATTR_RO(description); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 751 | static ssize_t bind_mode_show(struct device_driver *drv, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | { |
| 753 | struct serio_driver *serio_drv = to_serio_driver(drv); |
| 754 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); |
| 755 | } |
| 756 | |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 757 | static ssize_t bind_mode_store(struct device_driver *drv, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | { |
| 759 | struct serio_driver *serio_drv = to_serio_driver(drv); |
| 760 | int retval; |
| 761 | |
| 762 | retval = count; |
| 763 | if (!strncmp(buf, "manual", count)) { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 764 | serio_drv->manual_bind = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | } else if (!strncmp(buf, "auto", count)) { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 766 | serio_drv->manual_bind = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } else { |
| 768 | retval = -EINVAL; |
| 769 | } |
| 770 | |
| 771 | return retval; |
| 772 | } |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 773 | static DRIVER_ATTR_RW(bind_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 775 | static struct attribute *serio_driver_attrs[] = { |
| 776 | &driver_attr_description.attr, |
| 777 | &driver_attr_bind_mode.attr, |
| 778 | NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | }; |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 780 | ATTRIBUTE_GROUPS(serio_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | static int serio_driver_probe(struct device *dev) |
| 783 | { |
| 784 | struct serio *serio = to_serio_port(dev); |
| 785 | struct serio_driver *drv = to_serio_driver(dev->driver); |
| 786 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 787 | return serio_connect_driver(serio, drv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | static int serio_driver_remove(struct device *dev) |
| 791 | { |
| 792 | struct serio *serio = to_serio_port(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Linus Torvalds | 3c803e8 | 2005-06-27 17:49:45 -0700 | [diff] [blame] | 794 | serio_disconnect_driver(serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | return 0; |
| 796 | } |
| 797 | |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 798 | static void serio_cleanup(struct serio *serio) |
| 799 | { |
Dmitry Torokhov | 33143ea | 2007-06-29 01:06:35 -0400 | [diff] [blame] | 800 | mutex_lock(&serio->drv_mutex); |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 801 | if (serio->drv && serio->drv->cleanup) |
| 802 | serio->drv->cleanup(serio); |
Dmitry Torokhov | 33143ea | 2007-06-29 01:06:35 -0400 | [diff] [blame] | 803 | mutex_unlock(&serio->drv_mutex); |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | static void serio_shutdown(struct device *dev) |
| 807 | { |
| 808 | struct serio *serio = to_serio_port(dev); |
| 809 | |
| 810 | serio_cleanup(serio); |
| 811 | } |
| 812 | |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 813 | static void serio_attach_driver(struct serio_driver *drv) |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 814 | { |
| 815 | int error; |
| 816 | |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 817 | error = driver_attach(&drv->driver); |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 818 | if (error) |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 819 | pr_warning("driver_attach() failed for %s with error %d\n", |
| 820 | drv->driver.name, error); |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 821 | } |
| 822 | |
Greg Kroah-Hartman | 4b31562 | 2007-01-15 11:50:02 -0800 | [diff] [blame] | 823 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 825 | bool manual_bind = drv->manual_bind; |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 826 | int error; |
| 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | drv->driver.bus = &serio_bus; |
Greg Kroah-Hartman | 4b31562 | 2007-01-15 11:50:02 -0800 | [diff] [blame] | 829 | drv->driver.owner = owner; |
| 830 | drv->driver.mod_name = mod_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 832 | /* |
| 833 | * Temporarily disable automatic binding because probing |
| 834 | * takes long time and we are better off doing it in kseriod |
| 835 | */ |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 836 | drv->manual_bind = true; |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 837 | |
| 838 | error = driver_register(&drv->driver); |
| 839 | if (error) { |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 840 | pr_err("driver_register() failed for %s, error: %d\n", |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 841 | drv->driver.name, error); |
| 842 | return error; |
| 843 | } |
| 844 | |
| 845 | /* |
| 846 | * Restore original bind mode and let kseriod bind the |
| 847 | * driver to free ports |
| 848 | */ |
| 849 | if (!manual_bind) { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 850 | drv->manual_bind = false; |
Dmitry Torokhov | ed7b1f6 | 2006-11-23 23:34:49 -0500 | [diff] [blame] | 851 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
| 852 | if (error) { |
| 853 | driver_unregister(&drv->driver); |
| 854 | return error; |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 860 | EXPORT_SYMBOL(__serio_register_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | void serio_unregister_driver(struct serio_driver *drv) |
| 863 | { |
| 864 | struct serio *serio; |
| 865 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 866 | mutex_lock(&serio_mutex); |
Dmitry Torokhov | e8ef434 | 2008-06-02 00:41:57 -0400 | [diff] [blame] | 867 | |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 868 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
Dmitry Torokhov | e8ef434 | 2008-06-02 00:41:57 -0400 | [diff] [blame] | 869 | serio_remove_pending_events(drv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
| 871 | start_over: |
| 872 | list_for_each_entry(serio, &serio_list, node) { |
| 873 | if (serio->drv == drv) { |
| 874 | serio_disconnect_port(serio); |
| 875 | serio_find_driver(serio); |
| 876 | /* we could've deleted some ports, restart */ |
| 877 | goto start_over; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | driver_unregister(&drv->driver); |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 882 | mutex_unlock(&serio_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 884 | EXPORT_SYMBOL(serio_unregister_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) |
| 887 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | serio_pause_rx(serio); |
| 889 | serio->drv = drv; |
| 890 | serio_continue_rx(serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | static int serio_bus_match(struct device *dev, struct device_driver *drv) |
| 894 | { |
| 895 | struct serio *serio = to_serio_port(dev); |
| 896 | struct serio_driver *serio_drv = to_serio_driver(drv); |
| 897 | |
| 898 | if (serio->manual_bind || serio_drv->manual_bind) |
| 899 | return 0; |
| 900 | |
| 901 | return serio_match_port(serio_drv->id_table, serio); |
| 902 | } |
| 903 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 904 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 905 | do { \ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 906 | int err = add_uevent_var(env, fmt, val); \ |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 907 | if (err) \ |
| 908 | return err; \ |
| 909 | } while (0) |
| 910 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 911 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | { |
| 913 | struct serio *serio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | |
| 915 | if (!dev) |
| 916 | return -ENODEV; |
| 917 | |
| 918 | serio = to_serio_port(dev); |
| 919 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 920 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
| 921 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); |
| 922 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); |
| 923 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); |
| 924 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", |
Dmitry Torokhov | ae87dff | 2005-06-30 00:48:34 -0500 | [diff] [blame] | 925 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
| 927 | return 0; |
| 928 | } |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 929 | #undef SERIO_ADD_UEVENT_VAR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 931 | #ifdef CONFIG_PM |
Dmitry Torokhov | 633aae2 | 2009-07-22 21:51:36 -0700 | [diff] [blame] | 932 | static int serio_suspend(struct device *dev) |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 933 | { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 934 | struct serio *serio = to_serio_port(dev); |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 935 | |
Dmitry Torokhov | 633aae2 | 2009-07-22 21:51:36 -0700 | [diff] [blame] | 936 | serio_cleanup(serio); |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 937 | |
| 938 | return 0; |
| 939 | } |
| 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | static int serio_resume(struct device *dev) |
| 942 | { |
Dmitry Torokhov | 7e044e0 | 2009-05-09 16:08:05 -0700 | [diff] [blame] | 943 | struct serio *serio = to_serio_port(dev); |
| 944 | |
Shaohua Li | 6aabcdf | 2008-07-03 10:45:38 -0400 | [diff] [blame] | 945 | /* |
| 946 | * Driver reconnect can take a while, so better let kseriod |
| 947 | * deal with it. |
| 948 | */ |
Dmitry Torokhov | 633aae2 | 2009-07-22 21:51:36 -0700 | [diff] [blame] | 949 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
| 951 | return 0; |
| 952 | } |
Dmitry Torokhov | 633aae2 | 2009-07-22 21:51:36 -0700 | [diff] [blame] | 953 | |
| 954 | static const struct dev_pm_ops serio_pm_ops = { |
| 955 | .suspend = serio_suspend, |
| 956 | .resume = serio_resume, |
| 957 | .poweroff = serio_suspend, |
| 958 | .restore = serio_resume, |
| 959 | }; |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 960 | #endif /* CONFIG_PM */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 962 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | int serio_open(struct serio *serio, struct serio_driver *drv) |
| 964 | { |
| 965 | serio_set_drv(serio, drv); |
| 966 | |
| 967 | if (serio->open && serio->open(serio)) { |
| 968 | serio_set_drv(serio, NULL); |
| 969 | return -1; |
| 970 | } |
| 971 | return 0; |
| 972 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 973 | EXPORT_SYMBOL(serio_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
Arjan van de Ven | c4e32e9 | 2006-02-19 00:21:55 -0500 | [diff] [blame] | 975 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | void serio_close(struct serio *serio) |
| 977 | { |
| 978 | if (serio->close) |
| 979 | serio->close(serio); |
| 980 | |
| 981 | serio_set_drv(serio, NULL); |
| 982 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 983 | EXPORT_SYMBOL(serio_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
| 985 | irqreturn_t serio_interrupt(struct serio *serio, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 986 | unsigned char data, unsigned int dfl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | { |
| 988 | unsigned long flags; |
| 989 | irqreturn_t ret = IRQ_NONE; |
| 990 | |
| 991 | spin_lock_irqsave(&serio->lock, flags); |
| 992 | |
| 993 | if (likely(serio->drv)) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 994 | ret = serio->drv->interrupt(serio, data, dfl); |
Dmitry Torokhov | ddf1ffb | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 995 | } else if (!dfl && device_is_registered(&serio->dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | serio_rescan(serio); |
| 997 | ret = IRQ_HANDLED; |
| 998 | } |
| 999 | |
| 1000 | spin_unlock_irqrestore(&serio->lock, flags); |
| 1001 | |
| 1002 | return ret; |
| 1003 | } |
Dmitry Torokhov | 89b09b9 | 2009-04-17 20:12:34 -0700 | [diff] [blame] | 1004 | EXPORT_SYMBOL(serio_interrupt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Marton Nemeth | 1ea2a69 | 2006-11-02 23:27:21 -0500 | [diff] [blame] | 1006 | static struct bus_type serio_bus = { |
| 1007 | .name = "serio", |
Greg Kroah-Hartman | 7048f5d | 2013-08-23 14:24:34 -0700 | [diff] [blame] | 1008 | .drv_groups = serio_driver_groups, |
Marton Nemeth | 1ea2a69 | 2006-11-02 23:27:21 -0500 | [diff] [blame] | 1009 | .match = serio_bus_match, |
| 1010 | .uevent = serio_uevent, |
| 1011 | .probe = serio_driver_probe, |
| 1012 | .remove = serio_driver_remove, |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 1013 | .shutdown = serio_shutdown, |
| 1014 | #ifdef CONFIG_PM |
Dmitry Torokhov | 633aae2 | 2009-07-22 21:51:36 -0700 | [diff] [blame] | 1015 | .pm = &serio_pm_ops, |
Dmitry Torokhov | 82dd9ef | 2007-02-18 01:40:30 -0500 | [diff] [blame] | 1016 | #endif |
Marton Nemeth | 1ea2a69 | 2006-11-02 23:27:21 -0500 | [diff] [blame] | 1017 | }; |
| 1018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | static int __init serio_init(void) |
| 1020 | { |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 1021 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 1023 | error = bus_register(&serio_bus); |
| 1024 | if (error) { |
Dmitry Torokhov | cac9169 | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 1025 | pr_err("Failed to register serio bus, error: %d\n", error); |
Randy Dunlap | 73b59a3 | 2006-07-19 01:14:55 -0400 | [diff] [blame] | 1026 | return error; |
| 1027 | } |
| 1028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | static void __exit serio_exit(void) |
| 1033 | { |
| 1034 | bus_unregister(&serio_bus); |
Dmitry Torokhov | 8ee294c | 2010-11-15 01:39:57 -0800 | [diff] [blame] | 1035 | |
| 1036 | /* |
| 1037 | * There should not be any outstanding events but work may |
| 1038 | * still be scheduled so simply cancel it. |
| 1039 | */ |
| 1040 | cancel_work_sync(&serio_event_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | } |
| 1042 | |
Dmitry Torokhov | 51c38f9 | 2006-02-19 00:22:51 -0500 | [diff] [blame] | 1043 | subsys_initcall(serio_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | module_exit(serio_exit); |