projects/linux·blob v2.6.13 · refs

597 lines · 16.0 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/smp_lock.h>
28#include <linux/device.h>
29#include <linux/devfs_fs_kernel.h>
30
31MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
32MODULE_DESCRIPTION("Joystick device interfaces");
33MODULE_SUPPORTED_DEVICE("input/js");
34MODULE_LICENSE("GPL");
35
36#define JOYDEV_MINOR_BASE 0
37#define JOYDEV_MINORS 16
38#define JOYDEV_BUFFER_SIZE 64
39
40struct joydev {
41 int exist;
42 int open;
43 int minor;
44 char name[16];
45 struct input_handle handle;
46 wait_queue_head_t wait;
47 struct list_head list;
48 struct js_corr corr[ABS_MAX + 1];
49 struct JS_DATA_SAVE_TYPE glue;
50 int nabs;
51 int nkey;
52 __u16 keymap[KEY_MAX - BTN_MISC + 1];
53 __u16 keypam[KEY_MAX - BTN_MISC + 1];
54 __u8 absmap[ABS_MAX + 1];
55 __u8 abspam[ABS_MAX + 1];
56 __s16 abs[ABS_MAX + 1];
57};
58
59struct joydev_list {
60 struct js_event buffer[JOYDEV_BUFFER_SIZE];
61 int head;
62 int tail;
63 int startup;
64 struct fasync_struct *fasync;
65 struct joydev *joydev;
66 struct list_head node;
67};
68
69static struct joydev *joydev_table[JOYDEV_MINORS];
70
71static int joydev_correct(int value, struct js_corr *corr)
72{
73 switch (corr->type) {
74 case JS_CORR_NONE:
75 break;
76 case JS_CORR_BROKEN:
77 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
78 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
79 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
80 break;
81 default:
82 return 0;
83 }
84
85 if (value < -32767) return -32767;
86 if (value > 32767) return 32767;
87
88 return value;
89}
90
91static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
92{
93 struct joydev *joydev = handle->private;
94 struct joydev_list *list;
95 struct js_event event;
96
97 switch (type) {
98
99 case EV_KEY:
100 if (code < BTN_MISC || value == 2) return;
101 event.type = JS_EVENT_BUTTON;
102 event.number = joydev->keymap[code - BTN_MISC];
103 event.value = value;
104 break;
105
106 case EV_ABS:
107 event.type = JS_EVENT_AXIS;
108 event.number = joydev->absmap[code];
109 event.value = joydev_correct(value, joydev->corr + event.number);
110 if (event.value == joydev->abs[event.number]) return;
111 joydev->abs[event.number] = event.value;
112 break;
113
114 default:
115 return;
116 }
117
118 event.time = jiffies_to_msecs(jiffies);
119
120 list_for_each_entry(list, &joydev->list, node) {
121
122 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
123
124 if (list->startup == joydev->nabs + joydev->nkey)
125 if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
126 list->startup = 0;
127
128 kill_fasync(&list->fasync, SIGIO, POLL_IN);
129 }
130
131 wake_up_interruptible(&joydev->wait);
132}
133
134static int joydev_fasync(int fd, struct file *file, int on)
135{
136 int retval;
137 struct joydev_list *list = file->private_data;
138 retval = fasync_helper(fd, file, on, &list->fasync);
139 return retval < 0 ? retval : 0;
140}
141
142static void joydev_free(struct joydev *joydev)
143{
144 joydev_table[joydev->minor] = NULL;
145 kfree(joydev);
146}
147
148static int joydev_release(struct inode * inode, struct file * file)
149{
150 struct joydev_list *list = file->private_data;
151
152 joydev_fasync(-1, file, 0);
153
154 list_del(&list->node);
155
156 if (!--list->joydev->open) {
157 if (list->joydev->exist)
158 input_close_device(&list->joydev->handle);
159 else
160 joydev_free(list->joydev);
161 }
162
163 kfree(list);
164 return 0;
165}
166
167static int joydev_open(struct inode *inode, struct file *file)
168{
169 struct joydev_list *list;
170 int i = iminor(inode) - JOYDEV_MINOR_BASE;
171
172 if (i >= JOYDEV_MINORS || !joydev_table[i])
173 return -ENODEV;
174
175 if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
176 return -ENOMEM;
177 memset(list, 0, sizeof(struct joydev_list));
178
179 list->joydev = joydev_table[i];
180 list_add_tail(&list->node, &joydev_table[i]->list);
181 file->private_data = list;
182
183 if (!list->joydev->open++)
184 if (list->joydev->exist)
185 input_open_device(&list->joydev->handle);
186
187 return 0;
188}
189
190static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
191{
192 return -EINVAL;
193}
194
195static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
196{
197 struct joydev_list *list = file->private_data;
198 struct joydev *joydev = list->joydev;
199 struct input_dev *input = joydev->handle.dev;
200 int retval = 0;
201
202 if (!list->joydev->exist)
203 return -ENODEV;
204
205 if (count < sizeof(struct js_event))
206 return -EINVAL;
207
208 if (count == sizeof(struct JS_DATA_TYPE)) {
209
210 struct JS_DATA_TYPE data;
211 int i;
212
213 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
214 data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
215 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
216 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
217
218 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
219 return -EFAULT;
220
221 list->startup = 0;
222 list->tail = list->head;
223
224 return sizeof(struct JS_DATA_TYPE);
225 }
226
227 if (list->startup == joydev->nabs + joydev->nkey
228 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
229 return -EAGAIN;
230
231 retval = wait_event_interruptible(list->joydev->wait,
232 !list->joydev->exist ||
233 list->startup < joydev->nabs + joydev->nkey ||
234 list->head != list->tail);
235
236 if (retval)
237 return retval;
238
239 if (!list->joydev->exist)
240 return -ENODEV;
241
242 while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
243
244 struct js_event event;
245
246 event.time = jiffies_to_msecs(jiffies);
247
248 if (list->startup < joydev->nkey) {
249 event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
250 event.number = list->startup;
251 event.value = !!test_bit(joydev->keypam[event.number], input->key);
252 } else {
253 event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
254 event.number = list->startup - joydev->nkey;
255 event.value = joydev->abs[event.number];
256 }
257
258 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
259 return -EFAULT;
260
261 list->startup++;
262 retval += sizeof(struct js_event);
263 }
264
265 while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
266
267 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
268 return -EFAULT;
269
270 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
271 retval += sizeof(struct js_event);
272 }
273
274 return retval;
275}
276
277/* No kernel lock - fine */
278static unsigned int joydev_poll(struct file *file, poll_table *wait)
279{
280 struct joydev_list *list = file->private_data;
281 poll_wait(file, &list->joydev->wait, wait);
282 return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
283 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
284}
285
286static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
287{
288 struct input_dev *dev = joydev->handle.dev;
289 int i, j;
290
291 switch (cmd) {
292
293 case JS_SET_CAL:
294 return copy_from_user(&joydev->glue.JS_CORR, argp,
295 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
296 case JS_GET_CAL:
297 return copy_to_user(argp, &joydev->glue.JS_CORR,
298 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
299 case JS_SET_TIMEOUT:
300 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
301 case JS_GET_TIMEOUT:
302 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
303
304 case JSIOCGVERSION:
305 return put_user(JS_VERSION, (__u32 __user *) argp);
306 case JSIOCGAXES:
307 return put_user(joydev->nabs, (__u8 __user *) argp);
308 case JSIOCGBUTTONS:
309 return put_user(joydev->nkey, (__u8 __user *) argp);
310 case JSIOCSCORR:
311 if (copy_from_user(joydev->corr, argp,
312 sizeof(joydev->corr[0]) * joydev->nabs))
313 return -EFAULT;
314 for (i = 0; i < joydev->nabs; i++) {
315 j = joydev->abspam[i];
316 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
317 }
318 return 0;
319 case JSIOCGCORR:
320 return copy_to_user(argp, joydev->corr,
321 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
322 case JSIOCSAXMAP:
323 if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
324 return -EFAULT;
325 for (i = 0; i < joydev->nabs; i++) {
326 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
327 joydev->absmap[joydev->abspam[i]] = i;
328 }
329 return 0;
330 case JSIOCGAXMAP:
331 return copy_to_user(argp, joydev->abspam,
332 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
333 case JSIOCSBTNMAP:
334 if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
335 return -EFAULT;
336 for (i = 0; i < joydev->nkey; i++) {
337 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
338 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
339 }
340 return 0;
341 case JSIOCGBTNMAP:
342 return copy_to_user(argp, joydev->keypam,
343 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
344 default:
345 if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
346 int len;
347 if (!dev->name) return 0;
348 len = strlen(dev->name) + 1;
349 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
350 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
351 return len;
352 }
353 }
354 return -EINVAL;
355}
356
357#ifdef CONFIG_COMPAT
358static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
359{
360 struct joydev_list *list = file->private_data;
361 struct joydev *joydev = list->joydev;
362 void __user *argp = (void __user *)arg;
363 s32 tmp32;
364 struct JS_DATA_SAVE_TYPE_32 ds32;
365 int err;
366
367 if (!joydev->exist) return -ENODEV;
368 switch(cmd) {
369 case JS_SET_TIMELIMIT:
370 err = get_user(tmp32, (s32 __user *) arg);
371 if (err == 0)
372 joydev->glue.JS_TIMELIMIT = tmp32;
373 break;
374 case JS_GET_TIMELIMIT:
375 tmp32 = joydev->glue.JS_TIMELIMIT;
376 err = put_user(tmp32, (s32 __user *) arg);
377 break;
378
379 case JS_SET_ALL:
380 err = copy_from_user(&ds32, argp,
381 sizeof(ds32)) ? -EFAULT : 0;
382 if (err == 0) {
383 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
384 joydev->glue.BUSY = ds32.BUSY;
385 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
386 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
387 joydev->glue.JS_SAVE = ds32.JS_SAVE;
388 joydev->glue.JS_CORR = ds32.JS_CORR;
389 }
390 break;
391
392 case JS_GET_ALL:
393 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
394 ds32.BUSY = joydev->glue.BUSY;
395 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
396 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
397 ds32.JS_SAVE = joydev->glue.JS_SAVE;
398 ds32.JS_CORR = joydev->glue.JS_CORR;
399
400 err = copy_to_user(argp, &ds32,
401 sizeof(ds32)) ? -EFAULT : 0;
402 break;
403
404 default:
405 err = joydev_ioctl_common(joydev, cmd, argp);
406 }
407 return err;
408}
409#endif /* CONFIG_COMPAT */
410
411static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
412{
413 struct joydev_list *list = file->private_data;
414 struct joydev *joydev = list->joydev;
415 void __user *argp = (void __user *)arg;
416
417 if (!joydev->exist) return -ENODEV;
418
419 switch(cmd) {
420 case JS_SET_TIMELIMIT:
421 return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
422 case JS_GET_TIMELIMIT:
423 return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
424 case JS_SET_ALL:
425 return copy_from_user(&joydev->glue, argp,
426 sizeof(joydev->glue)) ? -EFAULT : 0;
427 case JS_GET_ALL:
428 return copy_to_user(argp, &joydev->glue,
429 sizeof(joydev->glue)) ? -EFAULT : 0;
430 default:
431 return joydev_ioctl_common(joydev, cmd, argp);
432 }
433}
434
435static struct file_operations joydev_fops = {
436 .owner = THIS_MODULE,
437 .read = joydev_read,
438 .write = joydev_write,
439 .poll = joydev_poll,
440 .open = joydev_open,
441 .release = joydev_release,
442 .ioctl = joydev_ioctl,
443#ifdef CONFIG_COMPAT
444 .compat_ioctl = joydev_compat_ioctl,
445#endif
446 .fasync = joydev_fasync,
447};
448
449static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
450{
451 struct joydev *joydev;
452 int i, j, t, minor;
453
454 for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
455 if (minor == JOYDEV_MINORS) {
456 printk(KERN_ERR "joydev: no more free joydev devices\n");
457 return NULL;
458 }
459
460 if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
461 return NULL;
462 memset(joydev, 0, sizeof(struct joydev));
463
464 INIT_LIST_HEAD(&joydev->list);
465 init_waitqueue_head(&joydev->wait);
466
467 joydev->minor = minor;
468 joydev->exist = 1;
469 joydev->handle.dev = dev;
470 joydev->handle.name = joydev->name;
471 joydev->handle.handler = handler;
472 joydev->handle.private = joydev;
473 sprintf(joydev->name, "js%d", minor);
474
475 for (i = 0; i < ABS_MAX + 1; i++)
476 if (test_bit(i, dev->absbit)) {
477 joydev->absmap[i] = joydev->nabs;
478 joydev->abspam[joydev->nabs] = i;
479 joydev->nabs++;
480 }
481
482 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
483 if (test_bit(i + BTN_MISC, dev->keybit)) {
484 joydev->keymap[i] = joydev->nkey;
485 joydev->keypam[joydev->nkey] = i + BTN_MISC;
486 joydev->nkey++;
487 }
488
489 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
490 if (test_bit(i + BTN_MISC, dev->keybit)) {
491 joydev->keymap[i] = joydev->nkey;
492 joydev->keypam[joydev->nkey] = i + BTN_MISC;
493 joydev->nkey++;
494 }
495
496 for (i = 0; i < joydev->nabs; i++) {
497 j = joydev->abspam[i];
498 if (dev->absmax[j] == dev->absmin[j]) {
499 joydev->corr[i].type = JS_CORR_NONE;
500 joydev->abs[i] = dev->abs[j];
501 continue;
502 }
503 joydev->corr[i].type = JS_CORR_BROKEN;
504 joydev->corr[i].prec = dev->absfuzz[j];
505 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
506 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
507 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
508 continue;
509 joydev->corr[i].coef[2] = (1 << 29) / t;
510 joydev->corr[i].coef[3] = (1 << 29) / t;
511
512 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
513 }
514
515 joydev_table[minor] = joydev;
516
517 devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
518 S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
519 class_device_create(input_class,
520 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
521 dev->dev, "js%d", minor);
522
523 return &joydev->handle;
524}
525
526static void joydev_disconnect(struct input_handle *handle)
527{
528 struct joydev *joydev = handle->private;
529 struct joydev_list *list;
530
531 class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
532 devfs_remove("input/js%d", joydev->minor);
533 joydev->exist = 0;
534
535 if (joydev->open) {
536 input_close_device(handle);
537 wake_up_interruptible(&joydev->wait);
538 list_for_each_entry(list, &joydev->list, node)
539 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
540 } else
541 joydev_free(joydev);
542}
543
544static struct input_device_id joydev_blacklist[] = {
545 {
546 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
547 .evbit = { BIT(EV_KEY) },
548 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
549 }, /* Avoid itouchpads, touchscreens and tablets */
550 { }, /* Terminating entry */
551};
552
553static struct input_device_id joydev_ids[] = {
554 {
555 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
556 .evbit = { BIT(EV_ABS) },
557 .absbit = { BIT(ABS_X) },
558 },
559 {
560 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
561 .evbit = { BIT(EV_ABS) },
562 .absbit = { BIT(ABS_WHEEL) },
563 },
564 {
565 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
566 .evbit = { BIT(EV_ABS) },
567 .absbit = { BIT(ABS_THROTTLE) },
568 },
569 { }, /* Terminating entry */
570};
571
572MODULE_DEVICE_TABLE(input, joydev_ids);
573
574static struct input_handler joydev_handler = {
575 .event = joydev_event,
576 .connect = joydev_connect,
577 .disconnect = joydev_disconnect,
578 .fops = &joydev_fops,
579 .minor = JOYDEV_MINOR_BASE,
580 .name = "joydev",
581 .id_table = joydev_ids,
582 .blacklist = joydev_blacklist,
583};
584
585static int __init joydev_init(void)
586{
587 input_register_handler(&joydev_handler);
588 return 0;
589}
590
591static void __exit joydev_exit(void)
592{
593 input_unregister_handler(&joydev_handler);
594}
595
596module_init(joydev_init);
597module_exit(joydev_exit);