projects/linux·blob v2.6.22 · refs

656 lines · 16.7 KiB

1/*
2 * Joystick device driver for the input driver suite.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 1999 Colin Van Dyke
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <asm/io.h>
14#include <asm/system.h>
15#include <linux/delay.h>
16#include <linux/errno.h>
17#include <linux/joystick.h>
18#include <linux/input.h>
19#include <linux/kernel.h>
20#include <linux/major.h>
21#include <linux/slab.h>
22#include <linux/mm.h>
23#include <linux/miscdevice.h>
24#include <linux/module.h>
25#include <linux/poll.h>
26#include <linux/init.h>
27#include <linux/device.h>
28
29MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
30MODULE_DESCRIPTION("Joystick device interfaces");
31MODULE_SUPPORTED_DEVICE("input/js");
32MODULE_LICENSE("GPL");
33
34#define JOYDEV_MINOR_BASE 0
35#define JOYDEV_MINORS 16
36#define JOYDEV_BUFFER_SIZE 64
37
38struct joydev {
39 int exist;
40 int open;
41 int minor;
42 char name[16];
43 struct input_handle handle;
44 wait_queue_head_t wait;
45 struct list_head client_list;
46 struct js_corr corr[ABS_MAX + 1];
47 struct JS_DATA_SAVE_TYPE glue;
48 int nabs;
49 int nkey;
50 __u16 keymap[KEY_MAX - BTN_MISC + 1];
51 __u16 keypam[KEY_MAX - BTN_MISC + 1];
52 __u8 absmap[ABS_MAX + 1];
53 __u8 abspam[ABS_MAX + 1];
54 __s16 abs[ABS_MAX + 1];
55};
56
57struct joydev_client {
58 struct js_event buffer[JOYDEV_BUFFER_SIZE];
59 int head;
60 int tail;
61 int startup;
62 struct fasync_struct *fasync;
63 struct joydev *joydev;
64 struct list_head node;
65};
66
67static struct joydev *joydev_table[JOYDEV_MINORS];
68
69static int joydev_correct(int value, struct js_corr *corr)
70{
71 switch (corr->type) {
72 case JS_CORR_NONE:
73 break;
74 case JS_CORR_BROKEN:
75 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
76 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
77 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
78 break;
79 default:
80 return 0;
81 }
82
83 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
84}
85
86static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
87{
88 struct joydev *joydev = handle->private;
89 struct joydev_client *client;
90 struct js_event event;
91
92 switch (type) {
93
94 case EV_KEY:
95 if (code < BTN_MISC || value == 2)
96 return;
97 event.type = JS_EVENT_BUTTON;
98 event.number = joydev->keymap[code - BTN_MISC];
99 event.value = value;
100 break;
101
102 case EV_ABS:
103 event.type = JS_EVENT_AXIS;
104 event.number = joydev->absmap[code];
105 event.value = joydev_correct(value, joydev->corr + event.number);
106 if (event.value == joydev->abs[event.number])
107 return;
108 joydev->abs[event.number] = event.value;
109 break;
110
111 default:
112 return;
113 }
114
115 event.time = jiffies_to_msecs(jiffies);
116
117 list_for_each_entry(client, &joydev->client_list, node) {
118
119 memcpy(client->buffer + client->head, &event, sizeof(struct js_event));
120
121 if (client->startup == joydev->nabs + joydev->nkey)
122 if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
123 client->startup = 0;
124
125 kill_fasync(&client->fasync, SIGIO, POLL_IN);
126 }
127
128 wake_up_interruptible(&joydev->wait);
129}
130
131static int joydev_fasync(int fd, struct file *file, int on)
132{
133 int retval;
134 struct joydev_client *client = file->private_data;
135
136 retval = fasync_helper(fd, file, on, &client->fasync);
137
138 return retval < 0 ? retval : 0;
139}
140
141static void joydev_free(struct joydev *joydev)
142{
143 joydev_table[joydev->minor] = NULL;
144 kfree(joydev);
145}
146
147static int joydev_release(struct inode *inode, struct file *file)
148{
149 struct joydev_client *client = file->private_data;
150 struct joydev *joydev = client->joydev;
151
152 joydev_fasync(-1, file, 0);
153
154 list_del(&client->node);
155 kfree(client);
156
157 if (!--joydev->open) {
158 if (joydev->exist)
159 input_close_device(&joydev->handle);
160 else
161 joydev_free(joydev);
162 }
163
164 return 0;
165}
166
167static int joydev_open(struct inode *inode, struct file *file)
168{
169 struct joydev_client *client;
170 struct joydev *joydev;
171 int i = iminor(inode) - JOYDEV_MINOR_BASE;
172 int error;
173
174 if (i >= JOYDEV_MINORS)
175 return -ENODEV;
176
177 joydev = joydev_table[i];
178 if (!joydev || !joydev->exist)
179 return -ENODEV;
180
181 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
182 if (!client)
183 return -ENOMEM;
184
185 client->joydev = joydev;
186 list_add_tail(&client->node, &joydev->client_list);
187
188 if (!joydev->open++ && joydev->exist) {
189 error = input_open_device(&joydev->handle);
190 if (error) {
191 list_del(&client->node);
192 kfree(client);
193 return error;
194 }
195 }
196
197 file->private_data = client;
198 return 0;
199}
200
201static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
202{
203 return -EINVAL;
204}
205
206static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
207{
208 struct joydev_client *client = file->private_data;
209 struct joydev *joydev = client->joydev;
210 struct input_dev *input = joydev->handle.dev;
211 int retval = 0;
212
213 if (!joydev->exist)
214 return -ENODEV;
215
216 if (count < sizeof(struct js_event))
217 return -EINVAL;
218
219 if (count == sizeof(struct JS_DATA_TYPE)) {
220
221 struct JS_DATA_TYPE data;
222 int i;
223
224 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
225 data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
226 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
227 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
228
229 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
230 return -EFAULT;
231
232 client->startup = 0;
233 client->tail = client->head;
234
235 return sizeof(struct JS_DATA_TYPE);
236 }
237
238 if (client->startup == joydev->nabs + joydev->nkey &&
239 client->head == client->tail && (file->f_flags & O_NONBLOCK))
240 return -EAGAIN;
241
242 retval = wait_event_interruptible(joydev->wait,
243 !joydev->exist ||
244 client->startup < joydev->nabs + joydev->nkey ||
245 client->head != client->tail);
246 if (retval)
247 return retval;
248
249 if (!joydev->exist)
250 return -ENODEV;
251
252 while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
253
254 struct js_event event;
255
256 event.time = jiffies_to_msecs(jiffies);
257
258 if (client->startup < joydev->nkey) {
259 event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
260 event.number = client->startup;
261 event.value = !!test_bit(joydev->keypam[event.number], input->key);
262 } else {
263 event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
264 event.number = client->startup - joydev->nkey;
265 event.value = joydev->abs[event.number];
266 }
267
268 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
269 return -EFAULT;
270
271 client->startup++;
272 retval += sizeof(struct js_event);
273 }
274
275 while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {
276
277 if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
278 return -EFAULT;
279
280 client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
281 retval += sizeof(struct js_event);
282 }
283
284 return retval;
285}
286
287/* No kernel lock - fine */
288static unsigned int joydev_poll(struct file *file, poll_table *wait)
289{
290 struct joydev_client *client = file->private_data;
291 struct joydev *joydev = client->joydev;
292
293 poll_wait(file, &joydev->wait, wait);
294 return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ?
295 (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR));
296}
297
298static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
299{
300 struct input_dev *dev = joydev->handle.dev;
301 int i, j;
302
303 switch (cmd) {
304
305 case JS_SET_CAL:
306 return copy_from_user(&joydev->glue.JS_CORR, argp,
307 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
308
309 case JS_GET_CAL:
310 return copy_to_user(argp, &joydev->glue.JS_CORR,
311 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
312
313 case JS_SET_TIMEOUT:
314 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
315
316 case JS_GET_TIMEOUT:
317 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
318
319 case JSIOCGVERSION:
320 return put_user(JS_VERSION, (__u32 __user *) argp);
321
322 case JSIOCGAXES:
323 return put_user(joydev->nabs, (__u8 __user *) argp);
324
325 case JSIOCGBUTTONS:
326 return put_user(joydev->nkey, (__u8 __user *) argp);
327
328 case JSIOCSCORR:
329 if (copy_from_user(joydev->corr, argp,
330 sizeof(joydev->corr[0]) * joydev->nabs))
331 return -EFAULT;
332 for (i = 0; i < joydev->nabs; i++) {
333 j = joydev->abspam[i];
334 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
335 }
336 return 0;
337
338 case JSIOCGCORR:
339 return copy_to_user(argp, joydev->corr,
340 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
341
342 case JSIOCSAXMAP:
343 if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
344 return -EFAULT;
345 for (i = 0; i < joydev->nabs; i++) {
346 if (joydev->abspam[i] > ABS_MAX)
347 return -EINVAL;
348 joydev->absmap[joydev->abspam[i]] = i;
349 }
350 return 0;
351
352 case JSIOCGAXMAP:
353 return copy_to_user(argp, joydev->abspam,
354 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
355
356 case JSIOCSBTNMAP:
357 if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
358 return -EFAULT;
359 for (i = 0; i < joydev->nkey; i++) {
360 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
361 return -EINVAL;
362 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
363 }
364 return 0;
365
366 case JSIOCGBTNMAP:
367 return copy_to_user(argp, joydev->keypam,
368 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
369
370 default:
371 if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
372 int len;
373 if (!dev->name)
374 return 0;
375 len = strlen(dev->name) + 1;
376 if (len > _IOC_SIZE(cmd))
377 len = _IOC_SIZE(cmd);
378 if (copy_to_user(argp, dev->name, len))
379 return -EFAULT;
380 return len;
381 }
382 }
383 return -EINVAL;
384}
385
386#ifdef CONFIG_COMPAT
387static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
388{
389 struct joydev_client *client = file->private_data;
390 struct joydev *joydev = client->joydev;
391 void __user *argp = (void __user *)arg;
392 s32 tmp32;
393 struct JS_DATA_SAVE_TYPE_32 ds32;
394 int err;
395
396 if (!joydev->exist)
397 return -ENODEV;
398
399 switch(cmd) {
400 case JS_SET_TIMELIMIT:
401 err = get_user(tmp32, (s32 __user *) arg);
402 if (err == 0)
403 joydev->glue.JS_TIMELIMIT = tmp32;
404 break;
405 case JS_GET_TIMELIMIT:
406 tmp32 = joydev->glue.JS_TIMELIMIT;
407 err = put_user(tmp32, (s32 __user *) arg);
408 break;
409
410 case JS_SET_ALL:
411 err = copy_from_user(&ds32, argp,
412 sizeof(ds32)) ? -EFAULT : 0;
413 if (err == 0) {
414 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
415 joydev->glue.BUSY = ds32.BUSY;
416 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
417 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
418 joydev->glue.JS_SAVE = ds32.JS_SAVE;
419 joydev->glue.JS_CORR = ds32.JS_CORR;
420 }
421 break;
422
423 case JS_GET_ALL:
424 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
425 ds32.BUSY = joydev->glue.BUSY;
426 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
427 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
428 ds32.JS_SAVE = joydev->glue.JS_SAVE;
429 ds32.JS_CORR = joydev->glue.JS_CORR;
430
431 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
432 break;
433
434 default:
435 err = joydev_ioctl_common(joydev, cmd, argp);
436 }
437 return err;
438}
439#endif /* CONFIG_COMPAT */
440
441static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
442{
443 struct joydev_client *client = file->private_data;
444 struct joydev *joydev = client->joydev;
445 void __user *argp = (void __user *)arg;
446
447 if (!joydev->exist)
448 return -ENODEV;
449
450 switch(cmd) {
451 case JS_SET_TIMELIMIT:
452 return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
453 case JS_GET_TIMELIMIT:
454 return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
455 case JS_SET_ALL:
456 return copy_from_user(&joydev->glue, argp,
457 sizeof(joydev->glue)) ? -EFAULT : 0;
458 case JS_GET_ALL:
459 return copy_to_user(argp, &joydev->glue,
460 sizeof(joydev->glue)) ? -EFAULT : 0;
461 default:
462 return joydev_ioctl_common(joydev, cmd, argp);
463 }
464}
465
466static const struct file_operations joydev_fops = {
467 .owner = THIS_MODULE,
468 .read = joydev_read,
469 .write = joydev_write,
470 .poll = joydev_poll,
471 .open = joydev_open,
472 .release = joydev_release,
473 .ioctl = joydev_ioctl,
474#ifdef CONFIG_COMPAT
475 .compat_ioctl = joydev_compat_ioctl,
476#endif
477 .fasync = joydev_fasync,
478};
479
480static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
481 const struct input_device_id *id)
482{
483 struct joydev *joydev;
484 struct class_device *cdev;
485 dev_t devt;
486 int i, j, t, minor;
487 int error;
488
489 for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
490 if (minor == JOYDEV_MINORS) {
491 printk(KERN_ERR "joydev: no more free joydev devices\n");
492 return -ENFILE;
493 }
494
495 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
496 if (!joydev)
497 return -ENOMEM;
498
499 INIT_LIST_HEAD(&joydev->client_list);
500 init_waitqueue_head(&joydev->wait);
501
502 joydev->minor = minor;
503 joydev->exist = 1;
504 joydev->handle.dev = dev;
505 joydev->handle.name = joydev->name;
506 joydev->handle.handler = handler;
507 joydev->handle.private = joydev;
508 sprintf(joydev->name, "js%d", minor);
509
510 for (i = 0; i < ABS_MAX + 1; i++)
511 if (test_bit(i, dev->absbit)) {
512 joydev->absmap[i] = joydev->nabs;
513 joydev->abspam[joydev->nabs] = i;
514 joydev->nabs++;
515 }
516
517 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
518 if (test_bit(i + BTN_MISC, dev->keybit)) {
519 joydev->keymap[i] = joydev->nkey;
520 joydev->keypam[joydev->nkey] = i + BTN_MISC;
521 joydev->nkey++;
522 }
523
524 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
525 if (test_bit(i + BTN_MISC, dev->keybit)) {
526 joydev->keymap[i] = joydev->nkey;
527 joydev->keypam[joydev->nkey] = i + BTN_MISC;
528 joydev->nkey++;
529 }
530
531 for (i = 0; i < joydev->nabs; i++) {
532 j = joydev->abspam[i];
533 if (dev->absmax[j] == dev->absmin[j]) {
534 joydev->corr[i].type = JS_CORR_NONE;
535 joydev->abs[i] = dev->abs[j];
536 continue;
537 }
538 joydev->corr[i].type = JS_CORR_BROKEN;
539 joydev->corr[i].prec = dev->absfuzz[j];
540 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
541 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
542 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
543 continue;
544 joydev->corr[i].coef[2] = (1 << 29) / t;
545 joydev->corr[i].coef[3] = (1 << 29) / t;
546
547 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
548 }
549
550 joydev_table[minor] = joydev;
551
552 devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
553
554 cdev = class_device_create(&input_class, &dev->cdev, devt,
555 dev->cdev.dev, joydev->name);
556 if (IS_ERR(cdev)) {
557 error = PTR_ERR(cdev);
558 goto err_free_joydev;
559 }
560
561 /* temporary symlink to keep userspace happy */
562 error = sysfs_create_link(&input_class.subsys.kobj,
563 &cdev->kobj, joydev->name);
564 if (error)
565 goto err_cdev_destroy;
566
567 error = input_register_handle(&joydev->handle);
568 if (error)
569 goto err_remove_link;
570
571 return 0;
572
573 err_remove_link:
574 sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
575 err_cdev_destroy:
576 class_device_destroy(&input_class, devt);
577 err_free_joydev:
578 joydev_table[minor] = NULL;
579 kfree(joydev);
580 return error;
581}
582
583
584static void joydev_disconnect(struct input_handle *handle)
585{
586 struct joydev *joydev = handle->private;
587 struct joydev_client *client;
588
589 input_unregister_handle(handle);
590
591 sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
592 class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
593 joydev->exist = 0;
594
595 if (joydev->open) {
596 input_close_device(handle);
597 list_for_each_entry(client, &joydev->client_list, node)
598 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
599 wake_up_interruptible(&joydev->wait);
600 } else
601 joydev_free(joydev);
602}
603
604static const struct input_device_id joydev_blacklist[] = {
605 {
606 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
607 .evbit = { BIT(EV_KEY) },
608 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
609 }, /* Avoid itouchpads, touchscreens and tablets */
610 { } /* Terminating entry */
611};
612
613static const struct input_device_id joydev_ids[] = {
614 {
615 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
616 .evbit = { BIT(EV_ABS) },
617 .absbit = { BIT(ABS_X) },
618 },
619 {
620 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
621 .evbit = { BIT(EV_ABS) },
622 .absbit = { BIT(ABS_WHEEL) },
623 },
624 {
625 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
626 .evbit = { BIT(EV_ABS) },
627 .absbit = { BIT(ABS_THROTTLE) },
628 },
629 { } /* Terminating entry */
630};
631
632MODULE_DEVICE_TABLE(input, joydev_ids);
633
634static struct input_handler joydev_handler = {
635 .event = joydev_event,
636 .connect = joydev_connect,
637 .disconnect = joydev_disconnect,
638 .fops = &joydev_fops,
639 .minor = JOYDEV_MINOR_BASE,
640 .name = "joydev",
641 .id_table = joydev_ids,
642 .blacklist = joydev_blacklist,
643};
644
645static int __init joydev_init(void)
646{
647 return input_register_handler(&joydev_handler);
648}
649
650static void __exit joydev_exit(void)
651{
652 input_unregister_handler(&joydev_handler);
653}
654
655module_init(joydev_init);
656module_exit(joydev_exit);