blob: da38d97a51b1c67782f3265a19bac3cdb5fd2686 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * The input core
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
Joe Perchesda0c4902010-11-29 23:33:07 -080013#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/init.h>
Dmitry Torokhovffd0db92009-09-16 01:06:43 -070016#include <linux/types.h>
Henrik Rydberg47c78e82010-11-27 09:16:48 +010017#include <linux/input/mt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/random.h>
21#include <linux/major.h>
22#include <linux/proc_fs.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040023#include <linux/sched.h>
Dmitry Torokhov969b21c2006-04-02 00:09:34 -050024#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/poll.h>
26#include <linux/device.h>
Jes Sorensene676c232006-02-19 00:21:46 -050027#include <linux/mutex.h>
Dmitry Torokhov80064792007-08-30 00:22:11 -040028#include <linux/rcupdate.h>
Dmitry Torokhov15e184a2010-01-11 00:05:43 -080029#include "input-compat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
32MODULE_DESCRIPTION("Input core");
33MODULE_LICENSE("GPL");
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#define INPUT_DEVICES 256
36
37static LIST_HEAD(input_dev_list);
38static LIST_HEAD(input_handler_list);
39
Dmitry Torokhov80064792007-08-30 00:22:11 -040040/*
41 * input_mutex protects access to both input_dev_list and input_handler_list.
42 * This also causes input_[un]register_device and input_[un]register_handler
43 * be mutually exclusive which simplifies locking in drivers implementing
44 * input handlers.
45 */
46static DEFINE_MUTEX(input_mutex);
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static struct input_handler *input_table[8];
49
Dmitry Torokhov80064792007-08-30 00:22:11 -040050static inline int is_event_supported(unsigned int code,
51 unsigned long *bm, unsigned int max)
52{
53 return code <= max && test_bit(code, bm);
54}
55
56static int input_defuzz_abs_event(int value, int old_val, int fuzz)
57{
58 if (fuzz) {
59 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
60 return old_val;
61
62 if (value > old_val - fuzz && value < old_val + fuzz)
63 return (old_val * 3 + value) / 4;
64
65 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
66 return (old_val + value) / 2;
67 }
68
69 return value;
70}
71
72/*
Dmitry Torokhovef7995f2010-01-29 23:59:12 -080073 * Pass event first through all filters and then, if event has not been
74 * filtered out, through all open handles. This function is called with
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040075 * dev->event_lock held and interrupts disabled.
Dmitry Torokhov80064792007-08-30 00:22:11 -040076 */
77static void input_pass_event(struct input_dev *dev,
78 unsigned int type, unsigned int code, int value)
79{
Dmitry Torokhovef7995f2010-01-29 23:59:12 -080080 struct input_handler *handler;
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040081 struct input_handle *handle;
Dmitry Torokhov80064792007-08-30 00:22:11 -040082
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040083 rcu_read_lock();
84
85 handle = rcu_dereference(dev->grab);
Dmitry Torokhov80064792007-08-30 00:22:11 -040086 if (handle)
87 handle->handler->event(handle, type, code, value);
Dmitry Torokhovef7995f2010-01-29 23:59:12 -080088 else {
89 bool filtered = false;
90
91 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
92 if (!handle->open)
93 continue;
94
95 handler = handle->handler;
96 if (!handler->filter) {
97 if (filtered)
98 break;
99
100 handler->event(handle, type, code, value);
101
102 } else if (handler->filter(handle, type, code, value))
103 filtered = true;
104 }
105 }
106
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400107 rcu_read_unlock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400108}
109
110/*
111 * Generate software autorepeat event. Note that we take
112 * dev->event_lock here to avoid racing with input_event
113 * which may cause keys get "stuck".
114 */
115static void input_repeat_key(unsigned long data)
116{
117 struct input_dev *dev = (void *) data;
118 unsigned long flags;
119
120 spin_lock_irqsave(&dev->event_lock, flags);
121
122 if (test_bit(dev->repeat_key, dev->key) &&
123 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
124
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800125 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400126
127 if (dev->sync) {
128 /*
129 * Only send SYN_REPORT if we are not in a middle
130 * of driver parsing a new hardware packet.
131 * Otherwise assume that the driver will send
132 * SYN_REPORT once it's done.
133 */
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800134 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400135 }
136
137 if (dev->rep[REP_PERIOD])
138 mod_timer(&dev->timer, jiffies +
139 msecs_to_jiffies(dev->rep[REP_PERIOD]));
140 }
141
142 spin_unlock_irqrestore(&dev->event_lock, flags);
143}
144
145static void input_start_autorepeat(struct input_dev *dev, int code)
146{
147 if (test_bit(EV_REP, dev->evbit) &&
148 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
149 dev->timer.data) {
150 dev->repeat_key = code;
151 mod_timer(&dev->timer,
152 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
153 }
154}
155
Johannes Berge7b5c1e2009-01-29 23:17:52 -0800156static void input_stop_autorepeat(struct input_dev *dev)
157{
158 del_timer(&dev->timer);
159}
160
Dmitry Torokhov80064792007-08-30 00:22:11 -0400161#define INPUT_IGNORE_EVENT 0
162#define INPUT_PASS_TO_HANDLERS 1
163#define INPUT_PASS_TO_DEVICE 2
164#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
165
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700166static int input_handle_abs_event(struct input_dev *dev,
167 unsigned int code, int *pval)
168{
169 bool is_mt_event;
170 int *pold;
171
172 if (code == ABS_MT_SLOT) {
173 /*
174 * "Stage" the event; we'll flush it later, when we
Dmitry Torokhov144c0f82010-09-03 10:31:05 -0700175 * get actual touch data.
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700176 */
177 if (*pval >= 0 && *pval < dev->mtsize)
178 dev->slot = *pval;
179
180 return INPUT_IGNORE_EVENT;
181 }
182
183 is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST;
184
185 if (!is_mt_event) {
Daniel Mackd31b2862010-08-02 20:18:21 -0700186 pold = &dev->absinfo[code].value;
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700187 } else if (dev->mt) {
188 struct input_mt_slot *mtslot = &dev->mt[dev->slot];
189 pold = &mtslot->abs[code - ABS_MT_FIRST];
190 } else {
191 /*
Dmitry Torokhov144c0f82010-09-03 10:31:05 -0700192 * Bypass filtering for multi-touch events when
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700193 * not employing slots.
194 */
195 pold = NULL;
196 }
197
198 if (pold) {
199 *pval = input_defuzz_abs_event(*pval, *pold,
Daniel Mackd31b2862010-08-02 20:18:21 -0700200 dev->absinfo[code].fuzz);
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700201 if (*pold == *pval)
202 return INPUT_IGNORE_EVENT;
203
204 *pold = *pval;
205 }
206
207 /* Flush pending "slot" event */
Daniel Mack987a6c02010-08-02 20:15:17 -0700208 if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
209 input_abs_set_val(dev, ABS_MT_SLOT, dev->slot);
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800210 input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot);
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700211 }
212
213 return INPUT_PASS_TO_HANDLERS;
214}
215
Dmitry Torokhov80064792007-08-30 00:22:11 -0400216static void input_handle_event(struct input_dev *dev,
217 unsigned int type, unsigned int code, int value)
218{
219 int disposition = INPUT_IGNORE_EVENT;
220
221 switch (type) {
222
223 case EV_SYN:
224 switch (code) {
225 case SYN_CONFIG:
226 disposition = INPUT_PASS_TO_ALL;
227 break;
228
229 case SYN_REPORT:
230 if (!dev->sync) {
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700231 dev->sync = true;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400232 disposition = INPUT_PASS_TO_HANDLERS;
233 }
234 break;
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700235 case SYN_MT_REPORT:
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700236 dev->sync = false;
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700237 disposition = INPUT_PASS_TO_HANDLERS;
238 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400239 }
240 break;
241
242 case EV_KEY:
243 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
244 !!test_bit(code, dev->key) != value) {
245
246 if (value != 2) {
247 __change_bit(code, dev->key);
248 if (value)
249 input_start_autorepeat(dev, code);
Johannes Berge7b5c1e2009-01-29 23:17:52 -0800250 else
251 input_stop_autorepeat(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400252 }
253
254 disposition = INPUT_PASS_TO_HANDLERS;
255 }
256 break;
257
258 case EV_SW:
259 if (is_event_supported(code, dev->swbit, SW_MAX) &&
260 !!test_bit(code, dev->sw) != value) {
261
262 __change_bit(code, dev->sw);
263 disposition = INPUT_PASS_TO_HANDLERS;
264 }
265 break;
266
267 case EV_ABS:
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700268 if (is_event_supported(code, dev->absbit, ABS_MAX))
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800269 disposition = input_handle_abs_event(dev, code, &value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400270
Dmitry Torokhov80064792007-08-30 00:22:11 -0400271 break;
272
273 case EV_REL:
274 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
275 disposition = INPUT_PASS_TO_HANDLERS;
276
277 break;
278
279 case EV_MSC:
280 if (is_event_supported(code, dev->mscbit, MSC_MAX))
281 disposition = INPUT_PASS_TO_ALL;
282
283 break;
284
285 case EV_LED:
286 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
287 !!test_bit(code, dev->led) != value) {
288
289 __change_bit(code, dev->led);
290 disposition = INPUT_PASS_TO_ALL;
291 }
292 break;
293
294 case EV_SND:
295 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
296
297 if (!!test_bit(code, dev->snd) != !!value)
298 __change_bit(code, dev->snd);
299 disposition = INPUT_PASS_TO_ALL;
300 }
301 break;
302
303 case EV_REP:
304 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
305 dev->rep[code] = value;
306 disposition = INPUT_PASS_TO_ALL;
307 }
308 break;
309
310 case EV_FF:
311 if (value >= 0)
312 disposition = INPUT_PASS_TO_ALL;
313 break;
Richard Purdieed2fa4d2008-01-03 10:46:21 -0500314
315 case EV_PWR:
316 disposition = INPUT_PASS_TO_ALL;
317 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400318 }
319
Dmitry Torokhovc9812282008-06-02 01:02:40 -0400320 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700321 dev->sync = false;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400322
323 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
324 dev->event(dev, type, code, value);
325
326 if (disposition & INPUT_PASS_TO_HANDLERS)
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800327 input_pass_event(dev, type, code, value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400328}
329
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400330/**
331 * input_event() - report new input event
Dmitry Torokhov14471902006-11-02 23:26:55 -0500332 * @dev: device that generated the event
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400333 * @type: type of the event
334 * @code: event code
335 * @value: value of the event
336 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400337 * This function should be used by drivers implementing various input
Dmitry Torokhovdf2d4632009-12-11 21:57:31 -0800338 * devices to report input events. See also input_inject_event().
339 *
340 * NOTE: input_event() may be safely used right after input device was
341 * allocated with input_allocate_device(), even before it is registered
342 * with input_register_device(), but the event will not reach any of the
343 * input handlers. Such early invocation of input_event() may be used
344 * to 'seed' initial state of a switch or initial position of absolute
345 * axis, etc.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400346 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400347void input_event(struct input_dev *dev,
348 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400350 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Dmitry Torokhov80064792007-08-30 00:22:11 -0400352 if (is_event_supported(type, dev->evbit, EV_MAX)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Dmitry Torokhov80064792007-08-30 00:22:11 -0400354 spin_lock_irqsave(&dev->event_lock, flags);
355 add_input_randomness(type, code, value);
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800356 input_handle_event(dev, type, code, value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400357 spin_unlock_irqrestore(&dev->event_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400360EXPORT_SYMBOL(input_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400362/**
363 * input_inject_event() - send input event from input handler
364 * @handle: input handle to send event through
365 * @type: type of the event
366 * @code: event code
367 * @value: value of the event
368 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400369 * Similar to input_event() but will ignore event if device is
370 * "grabbed" and handle injecting event is not the one that owns
371 * the device.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400372 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400373void input_inject_event(struct input_handle *handle,
374 unsigned int type, unsigned int code, int value)
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400375{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400376 struct input_dev *dev = handle->dev;
377 struct input_handle *grab;
378 unsigned long flags;
379
380 if (is_event_supported(type, dev->evbit, EV_MAX)) {
381 spin_lock_irqsave(&dev->event_lock, flags);
382
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400383 rcu_read_lock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400384 grab = rcu_dereference(dev->grab);
385 if (!grab || grab == handle)
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800386 input_handle_event(dev, type, code, value);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400387 rcu_read_unlock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400388
389 spin_unlock_irqrestore(&dev->event_lock, flags);
390 }
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400391}
392EXPORT_SYMBOL(input_inject_event);
393
Dmitry Torokhov80064792007-08-30 00:22:11 -0400394/**
Daniel Mackd31b2862010-08-02 20:18:21 -0700395 * input_alloc_absinfo - allocates array of input_absinfo structs
396 * @dev: the input device emitting absolute events
397 *
398 * If the absinfo struct the caller asked for is already allocated, this
399 * functions will not do anything.
400 */
401void input_alloc_absinfo(struct input_dev *dev)
402{
403 if (!dev->absinfo)
404 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
405 GFP_KERNEL);
406
407 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
408}
409EXPORT_SYMBOL(input_alloc_absinfo);
410
411void input_set_abs_params(struct input_dev *dev, unsigned int axis,
412 int min, int max, int fuzz, int flat)
413{
414 struct input_absinfo *absinfo;
415
416 input_alloc_absinfo(dev);
417 if (!dev->absinfo)
418 return;
419
420 absinfo = &dev->absinfo[axis];
421 absinfo->minimum = min;
422 absinfo->maximum = max;
423 absinfo->fuzz = fuzz;
424 absinfo->flat = flat;
425
426 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
427}
428EXPORT_SYMBOL(input_set_abs_params);
429
430
431/**
Dmitry Torokhov80064792007-08-30 00:22:11 -0400432 * input_grab_device - grabs device for exclusive use
433 * @handle: input handle that wants to own the device
434 *
435 * When a device is grabbed by an input handle all events generated by
436 * the device are delivered only to this handle. Also events injected
437 * by other input handles are ignored while device is grabbed.
438 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439int input_grab_device(struct input_handle *handle)
440{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400441 struct input_dev *dev = handle->dev;
442 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Dmitry Torokhov80064792007-08-30 00:22:11 -0400444 retval = mutex_lock_interruptible(&dev->mutex);
445 if (retval)
446 return retval;
447
448 if (dev->grab) {
449 retval = -EBUSY;
450 goto out;
451 }
452
453 rcu_assign_pointer(dev->grab, handle);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400454
455 out:
456 mutex_unlock(&dev->mutex);
457 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400459EXPORT_SYMBOL(input_grab_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Dmitry Torokhov80064792007-08-30 00:22:11 -0400461static void __input_release_device(struct input_handle *handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400463 struct input_dev *dev = handle->dev;
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400464
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400465 if (dev->grab == handle) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400466 rcu_assign_pointer(dev->grab, NULL);
467 /* Make sure input_pass_event() notices that grab is gone */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400468 synchronize_rcu();
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400469
470 list_for_each_entry(handle, &dev->h_list, d_node)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400471 if (handle->open && handle->handler->start)
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400472 handle->handler->start(handle);
473 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474}
Dmitry Torokhov80064792007-08-30 00:22:11 -0400475
476/**
477 * input_release_device - release previously grabbed device
478 * @handle: input handle that owns the device
479 *
480 * Releases previously grabbed device so that other input handles can
481 * start receiving input events. Upon release all handlers attached
482 * to the device have their start() method called so they have a change
483 * to synchronize device state with the rest of the system.
484 */
485void input_release_device(struct input_handle *handle)
486{
487 struct input_dev *dev = handle->dev;
488
489 mutex_lock(&dev->mutex);
490 __input_release_device(handle);
491 mutex_unlock(&dev->mutex);
492}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400493EXPORT_SYMBOL(input_release_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Dmitry Torokhov80064792007-08-30 00:22:11 -0400495/**
496 * input_open_device - open input device
497 * @handle: handle through which device is being accessed
498 *
499 * This function should be called by input handlers when they
500 * want to start receive events from given input device.
501 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502int input_open_device(struct input_handle *handle)
503{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500504 struct input_dev *dev = handle->dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400505 int retval;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500506
Dmitry Torokhov80064792007-08-30 00:22:11 -0400507 retval = mutex_lock_interruptible(&dev->mutex);
508 if (retval)
509 return retval;
510
511 if (dev->going_away) {
512 retval = -ENODEV;
513 goto out;
514 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 handle->open++;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500517
518 if (!dev->users++ && dev->open)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400519 retval = dev->open(dev);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500520
Dmitry Torokhov80064792007-08-30 00:22:11 -0400521 if (retval) {
522 dev->users--;
523 if (!--handle->open) {
524 /*
525 * Make sure we are not delivering any more events
526 * through this handle
527 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400528 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400529 }
530 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500531
Dmitry Torokhov80064792007-08-30 00:22:11 -0400532 out:
Jes Sorensene676c232006-02-19 00:21:46 -0500533 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400534 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400536EXPORT_SYMBOL(input_open_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Dmitry Torokhov80064792007-08-30 00:22:11 -0400538int input_flush_device(struct input_handle *handle, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400540 struct input_dev *dev = handle->dev;
541 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Dmitry Torokhov80064792007-08-30 00:22:11 -0400543 retval = mutex_lock_interruptible(&dev->mutex);
544 if (retval)
545 return retval;
546
547 if (dev->flush)
548 retval = dev->flush(dev, file);
549
550 mutex_unlock(&dev->mutex);
551 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400553EXPORT_SYMBOL(input_flush_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Dmitry Torokhov80064792007-08-30 00:22:11 -0400555/**
556 * input_close_device - close input device
557 * @handle: handle through which device is being accessed
558 *
559 * This function should be called by input handlers when they
560 * want to stop receive events from given input device.
561 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562void input_close_device(struct input_handle *handle)
563{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500564 struct input_dev *dev = handle->dev;
565
Jes Sorensene676c232006-02-19 00:21:46 -0500566 mutex_lock(&dev->mutex);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500567
Dmitry Torokhov80064792007-08-30 00:22:11 -0400568 __input_release_device(handle);
569
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500570 if (!--dev->users && dev->close)
571 dev->close(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400572
573 if (!--handle->open) {
574 /*
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400575 * synchronize_rcu() makes sure that input_pass_event()
Dmitry Torokhov80064792007-08-30 00:22:11 -0400576 * completed and that no more input events are delivered
577 * through this handle
578 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400579 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400580 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500581
Jes Sorensene676c232006-02-19 00:21:46 -0500582 mutex_unlock(&dev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400584EXPORT_SYMBOL(input_close_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Dmitry Torokhov80064792007-08-30 00:22:11 -0400586/*
Oliver Neukum866d7d72010-07-01 09:01:50 -0700587 * Simulate keyup events for all keys that are marked as pressed.
588 * The function must be called with dev->event_lock held.
589 */
590static void input_dev_release_keys(struct input_dev *dev)
591{
592 int code;
593
594 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
595 for (code = 0; code <= KEY_MAX; code++) {
596 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
597 __test_and_clear_bit(code, dev->key)) {
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800598 input_pass_event(dev, EV_KEY, code, 0);
Oliver Neukum866d7d72010-07-01 09:01:50 -0700599 }
600 }
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800601 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
Oliver Neukum866d7d72010-07-01 09:01:50 -0700602 }
603}
604
605/*
Dmitry Torokhov80064792007-08-30 00:22:11 -0400606 * Prepare device for unregistering
607 */
608static void input_disconnect_device(struct input_dev *dev)
609{
610 struct input_handle *handle;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400611
612 /*
613 * Mark device as going away. Note that we take dev->mutex here
614 * not to protect access to dev->going_away but rather to ensure
615 * that there are no threads in the middle of input_open_device()
616 */
617 mutex_lock(&dev->mutex);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -0700618 dev->going_away = true;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400619 mutex_unlock(&dev->mutex);
620
621 spin_lock_irq(&dev->event_lock);
622
623 /*
624 * Simulate keyup events for all pressed keys so that handlers
625 * are not left with "stuck" keys. The driver may continue
626 * generate events even after we done here but they will not
627 * reach any handlers.
628 */
Oliver Neukum866d7d72010-07-01 09:01:50 -0700629 input_dev_release_keys(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400630
631 list_for_each_entry(handle, &dev->h_list, d_node)
632 handle->open = 0;
633
634 spin_unlock_irq(&dev->event_lock);
635}
636
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700637/**
638 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
639 * @ke: keymap entry containing scancode to be converted.
640 * @scancode: pointer to the location where converted scancode should
641 * be stored.
642 *
643 * This function is used to convert scancode stored in &struct keymap_entry
644 * into scalar form understood by legacy keymap handling methods. These
645 * methods expect scancodes to be represented as 'unsigned int'.
646 */
647int input_scancode_to_scalar(const struct input_keymap_entry *ke,
648 unsigned int *scancode)
649{
650 switch (ke->len) {
651 case 1:
652 *scancode = *((u8 *)ke->scancode);
653 break;
654
655 case 2:
656 *scancode = *((u16 *)ke->scancode);
657 break;
658
659 case 4:
660 *scancode = *((u32 *)ke->scancode);
661 break;
662
663 default:
664 return -EINVAL;
665 }
666
667 return 0;
668}
669EXPORT_SYMBOL(input_scancode_to_scalar);
670
671/*
672 * Those routines handle the default case where no [gs]etkeycode() is
673 * defined. In this case, an array indexed by the scancode is used.
674 */
675
676static unsigned int input_fetch_keycode(struct input_dev *dev,
677 unsigned int index)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400678{
679 switch (dev->keycodesize) {
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700680 case 1:
681 return ((u8 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400682
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700683 case 2:
684 return ((u16 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400685
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700686 default:
687 return ((u32 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400688 }
689}
690
691static int input_default_getkeycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700692 struct input_keymap_entry *ke)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400693{
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700694 unsigned int index;
695 int error;
696
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400697 if (!dev->keycodesize)
698 return -EINVAL;
699
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700700 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
701 index = ke->index;
702 else {
703 error = input_scancode_to_scalar(ke, &index);
704 if (error)
705 return error;
706 }
707
708 if (index >= dev->keycodemax)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400709 return -EINVAL;
710
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700711 ke->keycode = input_fetch_keycode(dev, index);
712 ke->index = index;
713 ke->len = sizeof(index);
714 memcpy(ke->scancode, &index, sizeof(index));
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400715
716 return 0;
717}
718
719static int input_default_setkeycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700720 const struct input_keymap_entry *ke,
721 unsigned int *old_keycode)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400722{
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700723 unsigned int index;
724 int error;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400725 int i;
726
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400727 if (!dev->keycodesize)
728 return -EINVAL;
729
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700730 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
731 index = ke->index;
732 } else {
733 error = input_scancode_to_scalar(ke, &index);
734 if (error)
735 return error;
736 }
737
738 if (index >= dev->keycodemax)
739 return -EINVAL;
740
Mattia Dongilide391d12010-11-18 09:06:43 -0800741 if (dev->keycodesize < sizeof(ke->keycode) &&
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700742 (ke->keycode >> (dev->keycodesize * 8)))
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400743 return -EINVAL;
744
745 switch (dev->keycodesize) {
746 case 1: {
747 u8 *k = (u8 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700748 *old_keycode = k[index];
749 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400750 break;
751 }
752 case 2: {
753 u16 *k = (u16 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700754 *old_keycode = k[index];
755 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400756 break;
757 }
758 default: {
759 u32 *k = (u32 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700760 *old_keycode = k[index];
761 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400762 break;
763 }
764 }
765
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700766 __clear_bit(*old_keycode, dev->keybit);
767 __set_bit(ke->keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400768
769 for (i = 0; i < dev->keycodemax; i++) {
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700770 if (input_fetch_keycode(dev, i) == *old_keycode) {
771 __set_bit(*old_keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400772 break; /* Setting the bit twice is useless, so break */
773 }
774 }
775
776 return 0;
777}
778
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400779/**
780 * input_get_keycode - retrieve keycode currently mapped to a given scancode
781 * @dev: input device which keymap is being queried
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700782 * @ke: keymap entry
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400783 *
784 * This function should be called by anyone interested in retrieving current
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700785 * keymap. Presently evdev handlers use it.
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400786 */
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700787int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400788{
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700789 unsigned long flags;
790 int retval;
791
792 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800793 retval = dev->getkeycode(dev, ke);
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700794 spin_unlock_irqrestore(&dev->event_lock, flags);
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800795
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700796 return retval;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400797}
798EXPORT_SYMBOL(input_get_keycode);
799
800/**
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700801 * input_set_keycode - attribute a keycode to a given scancode
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400802 * @dev: input device which keymap is being updated
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700803 * @ke: new keymap entry
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400804 *
805 * This function should be called by anyone needing to update current
806 * keymap. Presently keyboard and evdev handlers use it.
807 */
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800808int input_set_keycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700809 const struct input_keymap_entry *ke)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400810{
811 unsigned long flags;
Dmitry Torokhovfd6cf3d2010-07-14 00:25:21 -0700812 unsigned int old_keycode;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400813 int retval;
814
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700815 if (ke->keycode > KEY_MAX)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400816 return -EINVAL;
817
818 spin_lock_irqsave(&dev->event_lock, flags);
819
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800820 retval = dev->setkeycode(dev, ke, &old_keycode);
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400821 if (retval)
822 goto out;
823
Dmitry Torokhov4f93df42010-01-05 17:56:00 -0800824 /* Make sure KEY_RESERVED did not get enabled. */
825 __clear_bit(KEY_RESERVED, dev->keybit);
826
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400827 /*
828 * Simulate keyup event if keycode is not present
829 * in the keymap anymore
830 */
831 if (test_bit(EV_KEY, dev->evbit) &&
832 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
833 __test_and_clear_bit(old_keycode, dev->key)) {
834
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800835 input_pass_event(dev, EV_KEY, old_keycode, 0);
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400836 if (dev->sync)
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800837 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400838 }
839
840 out:
841 spin_unlock_irqrestore(&dev->event_lock, flags);
842
843 return retval;
844}
845EXPORT_SYMBOL(input_set_keycode);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847#define MATCH_BIT(bit, max) \
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700848 for (i = 0; i < BITS_TO_LONGS(max); i++) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
850 break; \
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700851 if (i != BITS_TO_LONGS(max)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 continue;
853
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800854static const struct input_device_id *input_match_device(struct input_handler *handler,
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400855 struct input_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800857 const struct input_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 int i;
859
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800860 for (id = handler->id_table; id->flags || id->driver_info; id++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400863 if (id->bustype != dev->id.bustype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 continue;
865
866 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400867 if (id->vendor != dev->id.vendor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 continue;
869
870 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400871 if (id->product != dev->id.product)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 continue;
873
874 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400875 if (id->version != dev->id.version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 continue;
877
878 MATCH_BIT(evbit, EV_MAX);
879 MATCH_BIT(keybit, KEY_MAX);
880 MATCH_BIT(relbit, REL_MAX);
881 MATCH_BIT(absbit, ABS_MAX);
882 MATCH_BIT(mscbit, MSC_MAX);
883 MATCH_BIT(ledbit, LED_MAX);
884 MATCH_BIT(sndbit, SND_MAX);
885 MATCH_BIT(ffbit, FF_MAX);
Dmitry Torokhovff13f982005-09-24 02:02:29 -0500886 MATCH_BIT(swbit, SW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800888 if (!handler->match || handler->match(handler, dev))
889 return id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 }
891
892 return NULL;
893}
894
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400895static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
896{
897 const struct input_device_id *id;
898 int error;
899
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800900 id = input_match_device(handler, dev);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400901 if (!id)
902 return -ENODEV;
903
904 error = handler->connect(handler, dev, id);
905 if (error && error != -ENODEV)
Joe Perchesda0c4902010-11-29 23:33:07 -0800906 pr_err("failed to attach handler %s to device %s, error: %d\n",
907 handler->name, kobject_name(&dev->dev.kobj), error);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400908
909 return error;
910}
911
Dmitry Torokhov15e184a2010-01-11 00:05:43 -0800912#ifdef CONFIG_COMPAT
913
914static int input_bits_to_string(char *buf, int buf_size,
915 unsigned long bits, bool skip_empty)
916{
917 int len = 0;
918
919 if (INPUT_COMPAT_TEST) {
920 u32 dword = bits >> 32;
921 if (dword || !skip_empty)
922 len += snprintf(buf, buf_size, "%x ", dword);
923
924 dword = bits & 0xffffffffUL;
925 if (dword || !skip_empty || len)
926 len += snprintf(buf + len, max(buf_size - len, 0),
927 "%x", dword);
928 } else {
929 if (bits || !skip_empty)
930 len += snprintf(buf, buf_size, "%lx", bits);
931 }
932
933 return len;
934}
935
936#else /* !CONFIG_COMPAT */
937
938static int input_bits_to_string(char *buf, int buf_size,
939 unsigned long bits, bool skip_empty)
940{
941 return bits || !skip_empty ?
942 snprintf(buf, buf_size, "%lx", bits) : 0;
943}
944
945#endif
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400946
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947#ifdef CONFIG_PROC_FS
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500948
949static struct proc_dir_entry *proc_bus_input_dir;
950static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
951static int input_devices_state;
952
953static inline void input_wakeup_procfs_readers(void)
954{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 input_devices_state++;
956 wake_up(&input_devices_poll_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957}
958
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500959static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500961 poll_wait(file, &input_devices_poll_wait, wait);
Dmitry Torokhovfa886612009-03-04 00:52:20 -0800962 if (file->f_version != input_devices_state) {
963 file->f_version = input_devices_state;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500964 return POLLIN | POLLRDNORM;
Dmitry Torokhovfa886612009-03-04 00:52:20 -0800965 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400966
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500967 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968}
969
Dmitry Torokhov1572ca22009-10-13 23:37:30 -0700970union input_seq_state {
971 struct {
972 unsigned short pos;
973 bool mutex_acquired;
974 };
975 void *p;
976};
977
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500978static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
979{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -0700980 union input_seq_state *state = (union input_seq_state *)&seq->private;
981 int error;
982
983 /* We need to fit into seq->private pointer */
984 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
985
986 error = mutex_lock_interruptible(&input_mutex);
987 if (error) {
988 state->mutex_acquired = false;
989 return ERR_PTR(error);
990 }
991
992 state->mutex_acquired = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500993
Pavel Emelianovad5d9722007-07-18 00:38:32 -0400994 return seq_list_start(&input_dev_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500995}
996
997static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
998{
Pavel Emelianovad5d9722007-07-18 00:38:32 -0400999 return seq_list_next(v, &input_dev_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001000}
1001
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001002static void input_seq_stop(struct seq_file *seq, void *v)
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001003{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001004 union input_seq_state *state = (union input_seq_state *)&seq->private;
1005
1006 if (state->mutex_acquired)
1007 mutex_unlock(&input_mutex);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001008}
1009
1010static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1011 unsigned long *bitmap, int max)
1012{
1013 int i;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001014 bool skip_empty = true;
1015 char buf[18];
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001016
1017 seq_printf(seq, "B: %s=", name);
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001018
1019 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1020 if (input_bits_to_string(buf, sizeof(buf),
1021 bitmap[i], skip_empty)) {
1022 skip_empty = false;
1023 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1024 }
1025 }
1026
1027 /*
1028 * If no output was produced print a single 0.
1029 */
1030 if (skip_empty)
1031 seq_puts(seq, "0");
1032
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001033 seq_putc(seq, '\n');
1034}
1035
1036static int input_devices_seq_show(struct seq_file *seq, void *v)
1037{
1038 struct input_dev *dev = container_of(v, struct input_dev, node);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001039 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 struct input_handle *handle;
1041
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001042 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1043 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001045 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1046 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1047 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
Dmitry Torokhov15e03ae2007-03-07 23:20:17 -05001048 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001049 seq_printf(seq, "H: Handlers=");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001051 list_for_each_entry(handle, &dev->h_list, d_node)
1052 seq_printf(seq, "%s ", handle->name);
1053 seq_putc(seq, '\n');
Dmitry Torokhov051b2fe2005-09-15 02:01:54 -05001054
Henrik Rydberg85b77202010-12-18 20:51:13 +01001055 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1056
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001057 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1058 if (test_bit(EV_KEY, dev->evbit))
1059 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1060 if (test_bit(EV_REL, dev->evbit))
1061 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1062 if (test_bit(EV_ABS, dev->evbit))
1063 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1064 if (test_bit(EV_MSC, dev->evbit))
1065 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1066 if (test_bit(EV_LED, dev->evbit))
1067 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1068 if (test_bit(EV_SND, dev->evbit))
1069 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1070 if (test_bit(EV_FF, dev->evbit))
1071 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1072 if (test_bit(EV_SW, dev->evbit))
1073 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001075 seq_putc(seq, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001077 kfree(path);
1078 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079}
1080
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001081static const struct seq_operations input_devices_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001082 .start = input_devices_seq_start,
1083 .next = input_devices_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001084 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001085 .show = input_devices_seq_show,
1086};
1087
1088static int input_proc_devices_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089{
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001090 return seq_open(file, &input_devices_seq_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091}
1092
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001093static const struct file_operations input_devices_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001094 .owner = THIS_MODULE,
1095 .open = input_proc_devices_open,
1096 .poll = input_proc_devices_poll,
1097 .read = seq_read,
1098 .llseek = seq_lseek,
1099 .release = seq_release,
1100};
1101
1102static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1103{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001104 union input_seq_state *state = (union input_seq_state *)&seq->private;
1105 int error;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001106
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001107 /* We need to fit into seq->private pointer */
1108 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1109
1110 error = mutex_lock_interruptible(&input_mutex);
1111 if (error) {
1112 state->mutex_acquired = false;
1113 return ERR_PTR(error);
1114 }
1115
1116 state->mutex_acquired = true;
1117 state->pos = *pos;
1118
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001119 return seq_list_start(&input_handler_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001120}
1121
1122static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1123{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001124 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001125
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001126 state->pos = *pos + 1;
1127 return seq_list_next(v, &input_handler_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001128}
1129
1130static int input_handlers_seq_show(struct seq_file *seq, void *v)
1131{
1132 struct input_handler *handler = container_of(v, struct input_handler, node);
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001133 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001134
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001135 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08001136 if (handler->filter)
1137 seq_puts(seq, " (filter)");
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001138 if (handler->fops)
1139 seq_printf(seq, " Minor=%d", handler->minor);
1140 seq_putc(seq, '\n');
1141
1142 return 0;
1143}
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001144
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001145static const struct seq_operations input_handlers_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001146 .start = input_handlers_seq_start,
1147 .next = input_handlers_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001148 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001149 .show = input_handlers_seq_show,
1150};
1151
1152static int input_proc_handlers_open(struct inode *inode, struct file *file)
1153{
1154 return seq_open(file, &input_handlers_seq_ops);
1155}
1156
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001157static const struct file_operations input_handlers_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001158 .owner = THIS_MODULE,
1159 .open = input_proc_handlers_open,
1160 .read = seq_read,
1161 .llseek = seq_lseek,
1162 .release = seq_release,
1163};
Luke Kosewskie334016fc2005-06-01 02:39:28 -05001164
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165static int __init input_proc_init(void)
1166{
1167 struct proc_dir_entry *entry;
1168
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001169 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001170 if (!proc_bus_input_dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 return -ENOMEM;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001172
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001173 entry = proc_create("devices", 0, proc_bus_input_dir,
1174 &input_devices_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001175 if (!entry)
1176 goto fail1;
1177
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001178 entry = proc_create("handlers", 0, proc_bus_input_dir,
1179 &input_handlers_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001180 if (!entry)
1181 goto fail2;
1182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001184
1185 fail2: remove_proc_entry("devices", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001186 fail1: remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001187 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188}
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001189
Andrew Mortonbeffbdc2005-07-01 23:54:30 -05001190static void input_proc_exit(void)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001191{
1192 remove_proc_entry("devices", proc_bus_input_dir);
1193 remove_proc_entry("handlers", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001194 remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001195}
1196
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197#else /* !CONFIG_PROC_FS */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001198static inline void input_wakeup_procfs_readers(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199static inline int input_proc_init(void) { return 0; }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001200static inline void input_proc_exit(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201#endif
1202
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001203#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1204static ssize_t input_dev_show_##name(struct device *dev, \
1205 struct device_attribute *attr, \
1206 char *buf) \
1207{ \
1208 struct input_dev *input_dev = to_input_dev(dev); \
1209 \
1210 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1211 input_dev->name ? input_dev->name : ""); \
1212} \
1213static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001214
1215INPUT_DEV_STRING_ATTR_SHOW(name);
1216INPUT_DEV_STRING_ATTR_SHOW(phys);
1217INPUT_DEV_STRING_ATTR_SHOW(uniq);
1218
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001219static int input_print_modalias_bits(char *buf, int size,
1220 char name, unsigned long *bm,
1221 unsigned int min_bit, unsigned int max_bit)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001222{
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001223 int len = 0, i;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001224
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001225 len += snprintf(buf, max(size, 0), "%c", name);
1226 for (i = min_bit; i < max_bit; i++)
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001227 if (bm[BIT_WORD(i)] & BIT_MASK(i))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001228 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001229 return len;
1230}
1231
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001232static int input_print_modalias(char *buf, int size, struct input_dev *id,
1233 int add_cr)
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001234{
1235 int len;
1236
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001237 len = snprintf(buf, max(size, 0),
1238 "input:b%04Xv%04Xp%04Xe%04X-",
1239 id->id.bustype, id->id.vendor,
1240 id->id.product, id->id.version);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001241
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001242 len += input_print_modalias_bits(buf + len, size - len,
1243 'e', id->evbit, 0, EV_MAX);
1244 len += input_print_modalias_bits(buf + len, size - len,
1245 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1246 len += input_print_modalias_bits(buf + len, size - len,
1247 'r', id->relbit, 0, REL_MAX);
1248 len += input_print_modalias_bits(buf + len, size - len,
1249 'a', id->absbit, 0, ABS_MAX);
1250 len += input_print_modalias_bits(buf + len, size - len,
1251 'm', id->mscbit, 0, MSC_MAX);
1252 len += input_print_modalias_bits(buf + len, size - len,
1253 'l', id->ledbit, 0, LED_MAX);
1254 len += input_print_modalias_bits(buf + len, size - len,
1255 's', id->sndbit, 0, SND_MAX);
1256 len += input_print_modalias_bits(buf + len, size - len,
1257 'f', id->ffbit, 0, FF_MAX);
1258 len += input_print_modalias_bits(buf + len, size - len,
1259 'w', id->swbit, 0, SW_MAX);
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001260
1261 if (add_cr)
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001262 len += snprintf(buf + len, max(size - len, 0), "\n");
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001263
Rusty Russell1d8f4302005-12-07 21:40:34 +01001264 return len;
1265}
1266
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001267static ssize_t input_dev_show_modalias(struct device *dev,
1268 struct device_attribute *attr,
1269 char *buf)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001270{
1271 struct input_dev *id = to_input_dev(dev);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001272 ssize_t len;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001273
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001274 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1275
Richard Purdie8a3cf452006-06-26 01:48:21 -04001276 return min_t(int, len, PAGE_SIZE);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001277}
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001278static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001279
Henrik Rydberg85b77202010-12-18 20:51:13 +01001280static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1281 int max, int add_cr);
1282
1283static ssize_t input_dev_show_properties(struct device *dev,
1284 struct device_attribute *attr,
1285 char *buf)
1286{
1287 struct input_dev *input_dev = to_input_dev(dev);
1288 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1289 INPUT_PROP_MAX, true);
1290 return min_t(int, len, PAGE_SIZE);
1291}
1292static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1293
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001294static struct attribute *input_dev_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001295 &dev_attr_name.attr,
1296 &dev_attr_phys.attr,
1297 &dev_attr_uniq.attr,
1298 &dev_attr_modalias.attr,
Henrik Rydberg85b77202010-12-18 20:51:13 +01001299 &dev_attr_properties.attr,
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001300 NULL
1301};
1302
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001303static struct attribute_group input_dev_attr_group = {
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001304 .attrs = input_dev_attrs,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001305};
1306
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001307#define INPUT_DEV_ID_ATTR(name) \
1308static ssize_t input_dev_show_id_##name(struct device *dev, \
1309 struct device_attribute *attr, \
1310 char *buf) \
1311{ \
1312 struct input_dev *input_dev = to_input_dev(dev); \
1313 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1314} \
1315static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001316
1317INPUT_DEV_ID_ATTR(bustype);
1318INPUT_DEV_ID_ATTR(vendor);
1319INPUT_DEV_ID_ATTR(product);
1320INPUT_DEV_ID_ATTR(version);
1321
1322static struct attribute *input_dev_id_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001323 &dev_attr_bustype.attr,
1324 &dev_attr_vendor.attr,
1325 &dev_attr_product.attr,
1326 &dev_attr_version.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001327 NULL
1328};
1329
1330static struct attribute_group input_dev_id_attr_group = {
1331 .name = "id",
1332 .attrs = input_dev_id_attrs,
1333};
1334
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001335static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1336 int max, int add_cr)
1337{
1338 int i;
1339 int len = 0;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001340 bool skip_empty = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001341
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001342 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1343 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1344 bitmap[i], skip_empty);
1345 if (len) {
1346 skip_empty = false;
1347 if (i > 0)
1348 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1349 }
1350 }
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001351
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001352 /*
1353 * If no output was produced print a single 0.
1354 */
1355 if (len == 0)
1356 len = snprintf(buf, buf_size, "%d", 0);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001357
1358 if (add_cr)
1359 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1360
1361 return len;
1362}
1363
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001364#define INPUT_DEV_CAP_ATTR(ev, bm) \
1365static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1366 struct device_attribute *attr, \
1367 char *buf) \
1368{ \
1369 struct input_dev *input_dev = to_input_dev(dev); \
1370 int len = input_print_bitmap(buf, PAGE_SIZE, \
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001371 input_dev->bm##bit, ev##_MAX, \
1372 true); \
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001373 return min_t(int, len, PAGE_SIZE); \
1374} \
1375static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001376
1377INPUT_DEV_CAP_ATTR(EV, ev);
1378INPUT_DEV_CAP_ATTR(KEY, key);
1379INPUT_DEV_CAP_ATTR(REL, rel);
1380INPUT_DEV_CAP_ATTR(ABS, abs);
1381INPUT_DEV_CAP_ATTR(MSC, msc);
1382INPUT_DEV_CAP_ATTR(LED, led);
1383INPUT_DEV_CAP_ATTR(SND, snd);
1384INPUT_DEV_CAP_ATTR(FF, ff);
1385INPUT_DEV_CAP_ATTR(SW, sw);
1386
1387static struct attribute *input_dev_caps_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001388 &dev_attr_ev.attr,
1389 &dev_attr_key.attr,
1390 &dev_attr_rel.attr,
1391 &dev_attr_abs.attr,
1392 &dev_attr_msc.attr,
1393 &dev_attr_led.attr,
1394 &dev_attr_snd.attr,
1395 &dev_attr_ff.attr,
1396 &dev_attr_sw.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001397 NULL
1398};
1399
1400static struct attribute_group input_dev_caps_attr_group = {
1401 .name = "capabilities",
1402 .attrs = input_dev_caps_attrs,
1403};
1404
David Brownella4dbd672009-06-24 10:06:31 -07001405static const struct attribute_group *input_dev_attr_groups[] = {
Dmitry Torokhovcb9def42007-03-07 23:20:26 -05001406 &input_dev_attr_group,
1407 &input_dev_id_attr_group,
1408 &input_dev_caps_attr_group,
1409 NULL
1410};
1411
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001412static void input_dev_release(struct device *device)
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001413{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001414 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001415
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001416 input_ff_destroy(dev);
Henrik Rydberg40d007e2010-07-15 23:10:10 -07001417 input_mt_destroy_slots(dev);
Daniel Mackd31b2862010-08-02 20:18:21 -07001418 kfree(dev->absinfo);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001419 kfree(dev);
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001420
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001421 module_put(THIS_MODULE);
1422}
1423
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001424/*
Kay Sievers312c0042005-11-16 09:00:00 +01001425 * Input uevent interface - loading event handlers based on
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001426 * device bitfields.
1427 */
Kay Sievers7eff2e72007-08-14 15:15:12 +02001428static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001429 const char *name, unsigned long *bitmap, int max)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001430{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001431 int len;
1432
Henrik Rydbergfcd30272010-12-18 20:28:26 +01001433 if (add_uevent_var(env, "%s", name))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001434 return -ENOMEM;
1435
Kay Sievers7eff2e72007-08-14 15:15:12 +02001436 len = input_print_bitmap(&env->buf[env->buflen - 1],
1437 sizeof(env->buf) - env->buflen,
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001438 bitmap, max, false);
Kay Sievers7eff2e72007-08-14 15:15:12 +02001439 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001440 return -ENOMEM;
1441
Kay Sievers7eff2e72007-08-14 15:15:12 +02001442 env->buflen += len;
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001443 return 0;
1444}
1445
Kay Sievers7eff2e72007-08-14 15:15:12 +02001446static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001447 struct input_dev *dev)
1448{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001449 int len;
1450
1451 if (add_uevent_var(env, "MODALIAS="))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001452 return -ENOMEM;
1453
Kay Sievers7eff2e72007-08-14 15:15:12 +02001454 len = input_print_modalias(&env->buf[env->buflen - 1],
1455 sizeof(env->buf) - env->buflen,
1456 dev, 0);
1457 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001458 return -ENOMEM;
1459
Kay Sievers7eff2e72007-08-14 15:15:12 +02001460 env->buflen += len;
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001461 return 0;
1462}
1463
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001464#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1465 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001466 int err = add_uevent_var(env, fmt, val); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001467 if (err) \
1468 return err; \
1469 } while (0)
1470
1471#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1472 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001473 int err = input_add_uevent_bm_var(env, name, bm, max); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001474 if (err) \
1475 return err; \
1476 } while (0)
1477
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001478#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1479 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001480 int err = input_add_uevent_modalias_var(env, dev); \
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001481 if (err) \
1482 return err; \
1483 } while (0)
1484
Kay Sievers7eff2e72007-08-14 15:15:12 +02001485static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001486{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001487 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001488
1489 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1490 dev->id.bustype, dev->id.vendor,
1491 dev->id.product, dev->id.version);
1492 if (dev->name)
1493 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1494 if (dev->phys)
1495 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
Dmitry Torokhov08de1f02005-11-08 21:34:29 -08001496 if (dev->uniq)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001497 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1498
Henrik Rydberg85b77202010-12-18 20:51:13 +01001499 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1500
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001501 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1502 if (test_bit(EV_KEY, dev->evbit))
1503 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1504 if (test_bit(EV_REL, dev->evbit))
1505 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1506 if (test_bit(EV_ABS, dev->evbit))
1507 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1508 if (test_bit(EV_MSC, dev->evbit))
1509 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1510 if (test_bit(EV_LED, dev->evbit))
1511 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1512 if (test_bit(EV_SND, dev->evbit))
1513 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1514 if (test_bit(EV_FF, dev->evbit))
1515 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1516 if (test_bit(EV_SW, dev->evbit))
1517 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1518
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001519 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001520
1521 return 0;
1522}
1523
Dmitry Torokhov3cc96352009-11-12 23:19:05 -08001524#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1525 do { \
1526 int i; \
1527 bool active; \
1528 \
1529 if (!test_bit(EV_##type, dev->evbit)) \
1530 break; \
1531 \
1532 for (i = 0; i < type##_MAX; i++) { \
1533 if (!test_bit(i, dev->bits##bit)) \
1534 continue; \
1535 \
1536 active = test_bit(i, dev->bits); \
1537 if (!active && !on) \
1538 continue; \
1539 \
1540 dev->event(dev, EV_##type, i, on ? active : 0); \
1541 } \
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001542 } while (0)
1543
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001544static void input_dev_toggle(struct input_dev *dev, bool activate)
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001545{
1546 if (!dev->event)
1547 return;
1548
1549 INPUT_DO_TOGGLE(dev, LED, led, activate);
1550 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1551
1552 if (activate && test_bit(EV_REP, dev->evbit)) {
1553 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1554 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1555 }
1556}
1557
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001558/**
1559 * input_reset_device() - reset/restore the state of input device
1560 * @dev: input device whose state needs to be reset
1561 *
1562 * This function tries to reset the state of an opened input device and
1563 * bring internal state and state if the hardware in sync with each other.
1564 * We mark all keys as released, restore LED state, repeat rate, etc.
1565 */
1566void input_reset_device(struct input_dev *dev)
1567{
1568 mutex_lock(&dev->mutex);
1569
1570 if (dev->users) {
1571 input_dev_toggle(dev, true);
1572
1573 /*
1574 * Keys that have been pressed at suspend time are unlikely
1575 * to be still pressed when we resume.
1576 */
1577 spin_lock_irq(&dev->event_lock);
1578 input_dev_release_keys(dev);
1579 spin_unlock_irq(&dev->event_lock);
1580 }
1581
1582 mutex_unlock(&dev->mutex);
1583}
1584EXPORT_SYMBOL(input_reset_device);
1585
1586#ifdef CONFIG_PM
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001587static int input_dev_suspend(struct device *dev)
1588{
1589 struct input_dev *input_dev = to_input_dev(dev);
1590
1591 mutex_lock(&input_dev->mutex);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001592
1593 if (input_dev->users)
1594 input_dev_toggle(input_dev, false);
1595
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001596 mutex_unlock(&input_dev->mutex);
1597
1598 return 0;
1599}
1600
1601static int input_dev_resume(struct device *dev)
1602{
1603 struct input_dev *input_dev = to_input_dev(dev);
1604
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001605 input_reset_device(input_dev);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001606
1607 return 0;
1608}
1609
1610static const struct dev_pm_ops input_dev_pm_ops = {
1611 .suspend = input_dev_suspend,
1612 .resume = input_dev_resume,
1613 .poweroff = input_dev_suspend,
1614 .restore = input_dev_resume,
1615};
1616#endif /* CONFIG_PM */
1617
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001618static struct device_type input_dev_type = {
1619 .groups = input_dev_attr_groups,
1620 .release = input_dev_release,
1621 .uevent = input_dev_uevent,
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001622#ifdef CONFIG_PM
1623 .pm = &input_dev_pm_ops,
1624#endif
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001625};
1626
Kay Sieverse454cea2009-09-18 23:01:12 +02001627static char *input_devnode(struct device *dev, mode_t *mode)
Kay Sieversaa5ed632009-04-30 15:23:42 +02001628{
1629 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1630}
1631
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07001632struct class input_class = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001633 .name = "input",
Kay Sieverse454cea2009-09-18 23:01:12 +02001634 .devnode = input_devnode,
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001635};
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001636EXPORT_SYMBOL_GPL(input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001637
Dmitry Torokhov14471902006-11-02 23:26:55 -05001638/**
1639 * input_allocate_device - allocate memory for new input device
1640 *
1641 * Returns prepared struct input_dev or NULL.
1642 *
1643 * NOTE: Use input_free_device() to free devices that have not been
1644 * registered; input_unregister_device() should be used for already
1645 * registered devices.
1646 */
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001647struct input_dev *input_allocate_device(void)
1648{
1649 struct input_dev *dev;
1650
1651 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1652 if (dev) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001653 dev->dev.type = &input_dev_type;
1654 dev->dev.class = &input_class;
1655 device_initialize(&dev->dev);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001656 mutex_init(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04001657 spin_lock_init(&dev->event_lock);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001658 INIT_LIST_HEAD(&dev->h_list);
1659 INIT_LIST_HEAD(&dev->node);
Dmitry Torokhov655816e2006-09-14 01:32:14 -04001660
1661 __module_get(THIS_MODULE);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001662 }
1663
1664 return dev;
1665}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001666EXPORT_SYMBOL(input_allocate_device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001667
Dmitry Torokhov14471902006-11-02 23:26:55 -05001668/**
1669 * input_free_device - free memory occupied by input_dev structure
1670 * @dev: input device to free
1671 *
1672 * This function should only be used if input_register_device()
1673 * was not called yet or if it failed. Once device was registered
1674 * use input_unregister_device() and memory will be freed once last
Dmitry Torokhov80064792007-08-30 00:22:11 -04001675 * reference to the device is dropped.
Dmitry Torokhov14471902006-11-02 23:26:55 -05001676 *
1677 * Device should be allocated by input_allocate_device().
1678 *
1679 * NOTE: If there are references to the input device then memory
1680 * will not be freed until last reference is dropped.
1681 */
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001682void input_free_device(struct input_dev *dev)
1683{
Dmitry Torokhov54f9e362007-03-16 00:57:25 -04001684 if (dev)
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001685 input_put_device(dev);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001686}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001687EXPORT_SYMBOL(input_free_device);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001688
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001689/**
1690 * input_set_capability - mark device as capable of a certain event
1691 * @dev: device that is capable of emitting or accepting event
1692 * @type: type of the event (EV_KEY, EV_REL, etc...)
1693 * @code: event code
1694 *
1695 * In addition to setting up corresponding bit in appropriate capability
1696 * bitmap the function also adjusts dev->evbit.
1697 */
1698void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1699{
1700 switch (type) {
1701 case EV_KEY:
1702 __set_bit(code, dev->keybit);
1703 break;
1704
1705 case EV_REL:
1706 __set_bit(code, dev->relbit);
1707 break;
1708
1709 case EV_ABS:
1710 __set_bit(code, dev->absbit);
1711 break;
1712
1713 case EV_MSC:
1714 __set_bit(code, dev->mscbit);
1715 break;
1716
1717 case EV_SW:
1718 __set_bit(code, dev->swbit);
1719 break;
1720
1721 case EV_LED:
1722 __set_bit(code, dev->ledbit);
1723 break;
1724
1725 case EV_SND:
1726 __set_bit(code, dev->sndbit);
1727 break;
1728
1729 case EV_FF:
1730 __set_bit(code, dev->ffbit);
1731 break;
1732
Dmitry Baryshkov22d1c392007-12-14 01:21:03 -05001733 case EV_PWR:
1734 /* do nothing */
1735 break;
1736
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001737 default:
Joe Perchesda0c4902010-11-29 23:33:07 -08001738 pr_err("input_set_capability: unknown type %u (code %u)\n",
1739 type, code);
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001740 dump_stack();
1741 return;
1742 }
1743
1744 __set_bit(type, dev->evbit);
1745}
1746EXPORT_SYMBOL(input_set_capability);
1747
Jeff Brown80b48952011-04-18 10:08:02 -07001748static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1749{
1750 int mt_slots;
1751 int i;
1752 unsigned int events;
1753
1754 if (dev->mtsize) {
1755 mt_slots = dev->mtsize;
1756 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1757 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1758 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
Hans Petter Selasky8c127f02011-05-25 09:24:32 -07001759 mt_slots = clamp(mt_slots, 2, 32);
Jeff Brown80b48952011-04-18 10:08:02 -07001760 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1761 mt_slots = 2;
1762 } else {
1763 mt_slots = 0;
1764 }
1765
1766 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1767
1768 for (i = 0; i < ABS_CNT; i++) {
1769 if (test_bit(i, dev->absbit)) {
1770 if (input_is_mt_axis(i))
1771 events += mt_slots;
1772 else
1773 events++;
1774 }
1775 }
1776
1777 for (i = 0; i < REL_CNT; i++)
1778 if (test_bit(i, dev->relbit))
1779 events++;
1780
1781 return events;
1782}
1783
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08001784#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1785 do { \
1786 if (!test_bit(EV_##type, dev->evbit)) \
1787 memset(dev->bits##bit, 0, \
1788 sizeof(dev->bits##bit)); \
1789 } while (0)
1790
1791static void input_cleanse_bitmasks(struct input_dev *dev)
1792{
1793 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1794 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1795 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1796 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1797 INPUT_CLEANSE_BITMASK(dev, LED, led);
1798 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1799 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1800 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1801}
1802
Dmitry Torokhov80064792007-08-30 00:22:11 -04001803/**
1804 * input_register_device - register device with input core
1805 * @dev: device to be registered
1806 *
1807 * This function registers device with input core. The device must be
1808 * allocated with input_allocate_device() and all it's capabilities
1809 * set up before registering.
1810 * If function fails the device must be freed with input_free_device().
1811 * Once device has been successfully registered it can be unregistered
1812 * with input_unregister_device(); input_free_device() should not be
1813 * called in this case.
1814 */
Dmitry Torokhov5f945482005-11-02 22:51:46 -05001815int input_register_device(struct input_dev *dev)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001816{
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001817 static atomic_t input_no = ATOMIC_INIT(0);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001818 struct input_handler *handler;
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001819 const char *path;
1820 int error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001821
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08001822 /* Every input device generates EV_SYN/SYN_REPORT events. */
Dmitry Torokhov80064792007-08-30 00:22:11 -04001823 __set_bit(EV_SYN, dev->evbit);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001824
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08001825 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1826 __clear_bit(KEY_RESERVED, dev->keybit);
1827
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08001828 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1829 input_cleanse_bitmasks(dev);
1830
Jeff Brown80b48952011-04-18 10:08:02 -07001831 if (!dev->hint_events_per_packet)
1832 dev->hint_events_per_packet =
1833 input_estimate_events_per_packet(dev);
1834
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001835 /*
1836 * If delay and period are pre-set by the driver, then autorepeating
1837 * is handled by the driver itself and we don't do it in input.c.
1838 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001839 init_timer(&dev->timer);
1840 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1841 dev->timer.data = (long) dev;
1842 dev->timer.function = input_repeat_key;
1843 dev->rep[REP_DELAY] = 250;
1844 dev->rep[REP_PERIOD] = 33;
1845 }
1846
Dmitry Torokhovaebd6362011-01-31 21:06:39 -08001847 if (!dev->getkeycode)
1848 dev->getkeycode = input_default_getkeycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -04001849
Dmitry Torokhovaebd6362011-01-31 21:06:39 -08001850 if (!dev->setkeycode)
1851 dev->setkeycode = input_default_setkeycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -04001852
Kay Sieversa6c24902008-10-30 00:07:50 -04001853 dev_set_name(&dev->dev, "input%ld",
1854 (unsigned long) atomic_inc_return(&input_no) - 1);
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001855
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001856 error = device_add(&dev->dev);
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001857 if (error)
1858 return error;
1859
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001860 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
Joe Perchesda0c4902010-11-29 23:33:07 -08001861 pr_info("%s as %s\n",
1862 dev->name ? dev->name : "Unspecified device",
1863 path ? path : "N/A");
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001864 kfree(path);
Greg Kroah-Hartman10204022005-10-27 22:25:43 -07001865
Dmitry Torokhov80064792007-08-30 00:22:11 -04001866 error = mutex_lock_interruptible(&input_mutex);
1867 if (error) {
1868 device_del(&dev->dev);
1869 return error;
1870 }
1871
1872 list_add_tail(&dev->node, &input_dev_list);
1873
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001874 list_for_each_entry(handler, &input_handler_list, node)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001875 input_attach_handler(dev, handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001876
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001877 input_wakeup_procfs_readers();
Dmitry Torokhov5f945482005-11-02 22:51:46 -05001878
Dmitry Torokhov80064792007-08-30 00:22:11 -04001879 mutex_unlock(&input_mutex);
1880
Dmitry Torokhov5f945482005-11-02 22:51:46 -05001881 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001882}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001883EXPORT_SYMBOL(input_register_device);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001884
Dmitry Torokhov80064792007-08-30 00:22:11 -04001885/**
1886 * input_unregister_device - unregister previously registered device
1887 * @dev: device to be unregistered
1888 *
1889 * This function unregisters an input device. Once device is unregistered
1890 * the caller should not try to access it as it may get freed at any moment.
1891 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001892void input_unregister_device(struct input_dev *dev)
1893{
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001894 struct input_handle *handle, *next;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001895
Dmitry Torokhov80064792007-08-30 00:22:11 -04001896 input_disconnect_device(dev);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001897
Dmitry Torokhov80064792007-08-30 00:22:11 -04001898 mutex_lock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001899
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001900 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001901 handle->handler->disconnect(handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001902 WARN_ON(!list_empty(&dev->h_list));
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001903
Dmitry Torokhov80064792007-08-30 00:22:11 -04001904 del_timer_sync(&dev->timer);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001905 list_del_init(&dev->node);
1906
1907 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04001908
1909 mutex_unlock(&input_mutex);
1910
1911 device_unregister(&dev->dev);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001912}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001913EXPORT_SYMBOL(input_unregister_device);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001914
Dmitry Torokhov80064792007-08-30 00:22:11 -04001915/**
1916 * input_register_handler - register a new input handler
1917 * @handler: handler to be registered
1918 *
1919 * This function registers a new input handler (interface) for input
1920 * devices in the system and attaches it to all input devices that
1921 * are compatible with the handler.
1922 */
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001923int input_register_handler(struct input_handler *handler)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001924{
1925 struct input_dev *dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001926 int retval;
1927
1928 retval = mutex_lock_interruptible(&input_mutex);
1929 if (retval)
1930 return retval;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001931
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001932 INIT_LIST_HEAD(&handler->h_list);
1933
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001934 if (handler->fops != NULL) {
Dmitry Torokhov80064792007-08-30 00:22:11 -04001935 if (input_table[handler->minor >> 5]) {
1936 retval = -EBUSY;
1937 goto out;
1938 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001939 input_table[handler->minor >> 5] = handler;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001940 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001941
1942 list_add_tail(&handler->node, &input_handler_list);
1943
1944 list_for_each_entry(dev, &input_dev_list, node)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001945 input_attach_handler(dev, handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001946
1947 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04001948
1949 out:
1950 mutex_unlock(&input_mutex);
1951 return retval;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001952}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001953EXPORT_SYMBOL(input_register_handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001954
Dmitry Torokhov80064792007-08-30 00:22:11 -04001955/**
1956 * input_unregister_handler - unregisters an input handler
1957 * @handler: handler to be unregistered
1958 *
1959 * This function disconnects a handler from its input devices and
1960 * removes it from lists of known handlers.
1961 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001962void input_unregister_handler(struct input_handler *handler)
1963{
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001964 struct input_handle *handle, *next;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001965
Dmitry Torokhov80064792007-08-30 00:22:11 -04001966 mutex_lock(&input_mutex);
1967
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001968 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001969 handler->disconnect(handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001970 WARN_ON(!list_empty(&handler->h_list));
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001971
1972 list_del_init(&handler->node);
1973
1974 if (handler->fops != NULL)
1975 input_table[handler->minor >> 5] = NULL;
1976
1977 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04001978
1979 mutex_unlock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001980}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001981EXPORT_SYMBOL(input_unregister_handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001982
Dmitry Torokhov80064792007-08-30 00:22:11 -04001983/**
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08001984 * input_handler_for_each_handle - handle iterator
1985 * @handler: input handler to iterate
1986 * @data: data for the callback
1987 * @fn: function to be called for each handle
1988 *
1989 * Iterate over @bus's list of devices, and call @fn for each, passing
1990 * it @data and stop when @fn returns a non-zero value. The function is
1991 * using RCU to traverse the list and therefore may be usind in atonic
1992 * contexts. The @fn callback is invoked from RCU critical section and
1993 * thus must not sleep.
1994 */
1995int input_handler_for_each_handle(struct input_handler *handler, void *data,
1996 int (*fn)(struct input_handle *, void *))
1997{
1998 struct input_handle *handle;
1999 int retval = 0;
2000
2001 rcu_read_lock();
2002
2003 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2004 retval = fn(handle, data);
2005 if (retval)
2006 break;
2007 }
2008
2009 rcu_read_unlock();
2010
2011 return retval;
2012}
2013EXPORT_SYMBOL(input_handler_for_each_handle);
2014
2015/**
Dmitry Torokhov80064792007-08-30 00:22:11 -04002016 * input_register_handle - register a new input handle
2017 * @handle: handle to register
2018 *
2019 * This function puts a new input handle onto device's
2020 * and handler's lists so that events can flow through
2021 * it once it is opened using input_open_device().
2022 *
2023 * This function is supposed to be called from handler's
2024 * connect() method.
2025 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002026int input_register_handle(struct input_handle *handle)
2027{
2028 struct input_handler *handler = handle->handler;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002029 struct input_dev *dev = handle->dev;
2030 int error;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002031
Dmitry Torokhov80064792007-08-30 00:22:11 -04002032 /*
2033 * We take dev->mutex here to prevent race with
2034 * input_release_device().
2035 */
2036 error = mutex_lock_interruptible(&dev->mutex);
2037 if (error)
2038 return error;
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08002039
2040 /*
2041 * Filters go to the head of the list, normal handlers
2042 * to the tail.
2043 */
2044 if (handler->filter)
2045 list_add_rcu(&handle->d_node, &dev->h_list);
2046 else
2047 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2048
Dmitry Torokhov80064792007-08-30 00:22:11 -04002049 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04002050
2051 /*
2052 * Since we are supposed to be called from ->connect()
2053 * which is mutually exclusive with ->disconnect()
2054 * we can't be racing with input_unregister_handle()
2055 * and so separate lock is not needed here.
2056 */
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002057 list_add_tail_rcu(&handle->h_node, &handler->h_list);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002058
2059 if (handler->start)
2060 handler->start(handle);
2061
2062 return 0;
2063}
2064EXPORT_SYMBOL(input_register_handle);
2065
Dmitry Torokhov80064792007-08-30 00:22:11 -04002066/**
2067 * input_unregister_handle - unregister an input handle
2068 * @handle: handle to unregister
2069 *
2070 * This function removes input handle from device's
2071 * and handler's lists.
2072 *
2073 * This function is supposed to be called from handler's
2074 * disconnect() method.
2075 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002076void input_unregister_handle(struct input_handle *handle)
2077{
Dmitry Torokhov80064792007-08-30 00:22:11 -04002078 struct input_dev *dev = handle->dev;
2079
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002080 list_del_rcu(&handle->h_node);
Dmitry Torokhov80064792007-08-30 00:22:11 -04002081
2082 /*
2083 * Take dev->mutex to prevent race with input_release_device().
2084 */
2085 mutex_lock(&dev->mutex);
2086 list_del_rcu(&handle->d_node);
2087 mutex_unlock(&dev->mutex);
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002088
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -04002089 synchronize_rcu();
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002090}
2091EXPORT_SYMBOL(input_unregister_handle);
2092
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002093static int input_open_file(struct inode *inode, struct file *file)
2094{
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002095 struct input_handler *handler;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08002096 const struct file_operations *old_fops, *new_fops = NULL;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002097 int err;
2098
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002099 err = mutex_lock_interruptible(&input_mutex);
2100 if (err)
2101 return err;
2102
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002103 /* No load-on-demand here? */
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002104 handler = input_table[iminor(inode) >> 5];
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002105 if (handler)
2106 new_fops = fops_get(handler->fops);
2107
2108 mutex_unlock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002109
2110 /*
2111 * That's _really_ odd. Usually NULL ->open means "nothing special",
2112 * not "no device". Oh, well...
2113 */
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002114 if (!new_fops || !new_fops->open) {
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002115 fops_put(new_fops);
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002116 err = -ENODEV;
2117 goto out;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002118 }
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002119
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002120 old_fops = file->f_op;
2121 file->f_op = new_fops;
2122
2123 err = new_fops->open(inode, file);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002124 if (err) {
2125 fops_put(file->f_op);
2126 file->f_op = fops_get(old_fops);
2127 }
2128 fops_put(old_fops);
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002129out:
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002130 return err;
2131}
2132
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08002133static const struct file_operations input_fops = {
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002134 .owner = THIS_MODULE,
2135 .open = input_open_file,
Arnd Bergmann6038f372010-08-15 18:52:59 +02002136 .llseek = noop_llseek,
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002137};
2138
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139static int __init input_init(void)
2140{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002141 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002143 err = class_register(&input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002144 if (err) {
Joe Perchesda0c4902010-11-29 23:33:07 -08002145 pr_err("unable to register input_dev class\n");
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002146 return err;
2147 }
2148
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002149 err = input_proc_init();
2150 if (err)
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002151 goto fail1;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002152
2153 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2154 if (err) {
Joe Perchesda0c4902010-11-29 23:33:07 -08002155 pr_err("unable to register char major %d", INPUT_MAJOR);
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002156 goto fail2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002158
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002159 return 0;
2160
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002161 fail2: input_proc_exit();
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002162 fail1: class_unregister(&input_class);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002163 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164}
2165
2166static void __exit input_exit(void)
2167{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002168 input_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169 unregister_chrdev(INPUT_MAJOR, "input");
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002170 class_unregister(&input_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171}
2172
2173subsys_initcall(input_init);
2174module_exit(input_exit);