1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31#include <linux/init.h>
32#include <linux/sched.h>
33#include <linux/smp_lock.h>
34#include <linux/input.h>
35#include <linux/module.h>
36#include <linux/random.h>
37
38MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
39MODULE_DESCRIPTION("Input layer module");
40MODULE_LICENSE("GPL");
41
42
43EXPORT_SYMBOL(input_register_device);
44EXPORT_SYMBOL(input_unregister_device);
45EXPORT_SYMBOL(input_register_handler);
46EXPORT_SYMBOL(input_unregister_handler);
47EXPORT_SYMBOL(input_register_minor);
48EXPORT_SYMBOL(input_unregister_minor);
49EXPORT_SYMBOL(input_open_device);
50EXPORT_SYMBOL(input_close_device);
51EXPORT_SYMBOL(input_event);
52
53#define INPUT_MAJOR 13
54#define INPUT_DEVICES 256
55
56static struct input_dev *input_dev;
57static struct input_handler *input_handler;
58static struct input_handler *input_table[8];
59static devfs_handle_t input_devfs_handle;
60static int input_number;
61static long input_devices[NBITS(INPUT_DEVICES)];
62
63void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
64{
65 struct input_handle *handle = dev->handle;
66
67
68
69
70
71 if (type > EV_MAX || !test_bit(type, dev->evbit))
72 return;
73
74 switch (type) {
75
76 case EV_KEY:
77
78 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
79 return;
80
81 if (value == 2) break;
82
83 change_bit(code, dev->key);
84
85 if (test_bit(EV_REP, dev->evbit) && dev->timer.function) {
86 if (value) {
87 mod_timer(&dev->timer, jiffies + dev->rep[REP_DELAY]);
88 dev->repeat_key = code;
89 break;
90 }
91 if (dev->repeat_key == code)
92 del_timer(&dev->timer);
93 }
94
95 break;
96
97 case EV_ABS:
98
99 if (code > ABS_MAX || !test_bit(code, dev->absbit))
100 return;
101
102 if (dev->absfuzz[code]) {
103 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
104 (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
105 return;
106
107 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
108 (value < dev->abs[code] + dev->absfuzz[code]))
109 value = (dev->abs[code] * 3 + value) >> 2;
110
111 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
112 (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
113 value = (dev->abs[code] + value) >> 1;
114 }
115
116 if (dev->abs[code] == value)
117 return;
118
119 dev->abs[code] = value;
120 break;
121
122 case EV_REL:
123
124 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
125 return;
126
127 break;
128
129 case EV_MSC:
130
131 if (code > MSC_MAX || !test_bit(code, dev->mscbit))
132 return;
133
134 if (dev->event) dev->event(dev, type, code, value);
135
136 break;
137
138 case EV_LED:
139
140 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
141 return;
142
143 change_bit(code, dev->led);
144 if (dev->event) dev->event(dev, type, code, value);
145
146 break;
147
148 case EV_SND:
149
150 if (code > SND_MAX || !test_bit(code, dev->sndbit) || !!test_bit(code, dev->snd) == value)
151 return;
152
153 change_bit(code, dev->snd);
154 if (dev->event) dev->event(dev, type, code, value);
155
156 break;
157
158 case EV_REP:
159
160 if (code > REP_MAX || dev->rep[code] == value) return;
161
162 dev->rep[code] = value;
163 if (dev->event) dev->event(dev, type, code, value);
164
165 break;
166
167 case EV_FF:
168 if (dev->event) dev->event(dev, type, code, value);
169 break;
170 }
171
172
173
174
175
176 while (handle) {
177 if (handle->open)
178 handle->handler->event(handle, type, code, value);
179 handle = handle->dnext;
180 }
181}
182
183static void input_repeat_key(unsigned long data)
184{
185 struct input_dev *dev = (void *) data;
186 input_event(dev, EV_KEY, dev->repeat_key, 2);
187 mod_timer(&dev->timer, jiffies + dev->rep[REP_PERIOD]);
188}
189
190int input_open_device(struct input_handle *handle)
191{
192 handle->open++;
193 if (handle->dev->open)
194 return handle->dev->open(handle->dev);
195 return 0;
196}
197
198void input_close_device(struct input_handle *handle)
199{
200 if (handle->dev->close)
201 handle->dev->close(handle->dev);
202 handle->open--;
203}
204
205static void input_link_handle(struct input_handle *handle)
206{
207 handle->dnext = handle->dev->handle;
208 handle->hnext = handle->handler->handle;
209 handle->dev->handle = handle;
210 handle->handler->handle = handle;
211}
212
213static void input_unlink_handle(struct input_handle *handle)
214{
215 struct input_handle **handleptr;
216
217 handleptr = &handle->dev->handle;
218 while (*handleptr && (*handleptr != handle))
219 handleptr = &((*handleptr)->dnext);
220 *handleptr = (*handleptr)->dnext;
221
222 handleptr = &handle->handler->handle;
223 while (*handleptr && (*handleptr != handle))
224 handleptr = &((*handleptr)->hnext);
225 *handleptr = (*handleptr)->hnext;
226}
227
228void input_register_device(struct input_dev *dev)
229{
230 struct input_handler *handler = input_handler;
231 struct input_handle *handle;
232
233
234
235
236
237 init_timer(&dev->timer);
238 dev->timer.data = (long) dev;
239 dev->timer.function = input_repeat_key;
240 dev->rep[REP_DELAY] = HZ/4;
241 dev->rep[REP_PERIOD] = HZ/33;
242
243
244
245
246
247 if (input_number >= INPUT_DEVICES) {
248 printk(KERN_WARNING "input: ran out of input device numbers!\n");
249 dev->number = input_number;
250 } else {
251 dev->number = find_first_zero_bit(input_devices, INPUT_DEVICES);
252 set_bit(dev->number, input_devices);
253 }
254
255 dev->next = input_dev;
256 input_dev = dev;
257 input_number++;
258
259
260
261
262
263 while (handler) {
264 if ((handle = handler->connect(handler, dev)))
265 input_link_handle(handle);
266 handler = handler->next;
267 }
268}
269
270void input_unregister_device(struct input_dev *dev)
271{
272 struct input_handle *handle = dev->handle;
273 struct input_dev **devptr = &input_dev;
274 struct input_handle *dnext;
275
276
277
278
279
280 del_timer(&dev->timer);
281
282
283
284
285
286 while (handle) {
287 dnext = handle->dnext;
288 input_unlink_handle(handle);
289 handle->handler->disconnect(handle);
290 handle = dnext;
291 }
292
293
294
295
296
297 while (*devptr && (*devptr != dev))
298 devptr = &((*devptr)->next);
299 *devptr = (*devptr)->next;
300
301 input_number--;
302
303 if (dev->number < INPUT_DEVICES)
304 clear_bit(dev->number, input_devices);
305}
306
307void input_register_handler(struct input_handler *handler)
308{
309 struct input_dev *dev = input_dev;
310 struct input_handle *handle;
311
312
313
314
315
316 if (handler->fops != NULL)
317 input_table[handler->minor >> 5] = handler;
318
319
320
321
322
323 handler->next = input_handler;
324 input_handler = handler;
325
326
327
328
329
330 while (dev) {
331 if ((handle = handler->connect(handler, dev)))
332 input_link_handle(handle);
333 dev = dev->next;
334 }
335}
336
337void input_unregister_handler(struct input_handler *handler)
338{
339 struct input_handler **handlerptr = &input_handler;
340 struct input_handle *handle = handler->handle;
341 struct input_handle *hnext;
342
343
344
345
346
347 while (handle) {
348 hnext = handle->hnext;
349 input_unlink_handle(handle);
350 handler->disconnect(handle);
351 handle = hnext;
352 }
353
354
355
356
357
358 while (*handlerptr && (*handlerptr != handler))
359 handlerptr = &((*handlerptr)->next);
360
361 *handlerptr = (*handlerptr)->next;
362
363
364
365
366
367 if (handler->fops != NULL)
368 input_table[handler->minor >> 5] = NULL;
369}
370
371static int input_open_file(struct inode *inode, struct file *file)
372{
373 struct input_handler *handler = input_table[MINOR(inode->i_rdev) >> 5];
374 struct file_operations *old_fops, *new_fops = NULL;
375 int err;
376
377
378 if (!handler || !(new_fops = fops_get(handler->fops)))
379 return -ENODEV;
380
381
382
383
384
385 if (!new_fops->open) {
386 fops_put(new_fops);
387 return -ENODEV;
388 }
389 old_fops = file->f_op;
390 file->f_op = new_fops;
391
392 lock_kernel();
393 err = new_fops->open(inode, file);
394 unlock_kernel();
395
396 if (err) {
397 fops_put(file->f_op);
398 file->f_op = fops_get(old_fops);
399 }
400 fops_put(old_fops);
401 return err;
402}
403
404static struct file_operations input_fops = {
405 owner: THIS_MODULE,
406 open: input_open_file,
407};
408
409devfs_handle_t input_register_minor(char *name, int minor, int minor_base)
410{
411 char devfs_name[16];
412 sprintf(devfs_name, name, minor);
413 return devfs_register(input_devfs_handle, devfs_name, DEVFS_FL_DEFAULT, INPUT_MAJOR, minor + minor_base,
414 S_IFCHR | S_IRUGO | S_IWUSR, &input_fops, NULL);
415}
416
417void input_unregister_minor(devfs_handle_t handle)
418{
419 devfs_unregister(handle);
420}
421
422static int __init input_init(void)
423{
424 if (devfs_register_chrdev(INPUT_MAJOR, "input", &input_fops)) {
425 printk(KERN_ERR "input: unable to register char major %d\n", INPUT_MAJOR);
426 return -EBUSY;
427 }
428 input_devfs_handle = devfs_mk_dir(NULL, "input", NULL);
429 return 0;
430}
431
432static void __exit input_exit(void)
433{
434 devfs_unregister(input_devfs_handle);
435 if (devfs_unregister_chrdev(INPUT_MAJOR, "input"))
436 printk(KERN_ERR "input: can't unregister char major %d", INPUT_MAJOR);
437}
438
439module_init(input_init);
440module_exit(input_exit);
441
