Linux v2.6.15-rc7
[pohmelfs.git] / drivers / input / joydev.c
blob20e2972b9204f25fd5e60d9c051271f0a32acfb8
1 /*
2 * Joystick device driver for the input driver suite.
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 1999 Colin Van Dyke
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.
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>
30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
31 MODULE_DESCRIPTION("Joystick device interfaces");
32 MODULE_SUPPORTED_DEVICE("input/js");
33 MODULE_LICENSE("GPL");
35 #define JOYDEV_MINOR_BASE 0
36 #define JOYDEV_MINORS 16
37 #define JOYDEV_BUFFER_SIZE 64
39 struct joydev {
40 int exist;
41 int open;
42 int minor;
43 char name[16];
44 struct input_handle handle;
45 wait_queue_head_t wait;
46 struct list_head list;
47 struct js_corr corr[ABS_MAX + 1];
48 struct JS_DATA_SAVE_TYPE glue;
49 int nabs;
50 int nkey;
51 __u16 keymap[KEY_MAX - BTN_MISC + 1];
52 __u16 keypam[KEY_MAX - BTN_MISC + 1];
53 __u8 absmap[ABS_MAX + 1];
54 __u8 abspam[ABS_MAX + 1];
55 __s16 abs[ABS_MAX + 1];
58 struct joydev_list {
59 struct js_event buffer[JOYDEV_BUFFER_SIZE];
60 int head;
61 int tail;
62 int startup;
63 struct fasync_struct *fasync;
64 struct joydev *joydev;
65 struct list_head node;
68 static struct joydev *joydev_table[JOYDEV_MINORS];
70 static int joydev_correct(int value, struct js_corr *corr)
72 switch (corr->type) {
73 case JS_CORR_NONE:
74 break;
75 case JS_CORR_BROKEN:
76 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
77 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
78 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
79 break;
80 default:
81 return 0;
84 if (value < -32767) return -32767;
85 if (value > 32767) return 32767;
87 return value;
90 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
92 struct joydev *joydev = handle->private;
93 struct joydev_list *list;
94 struct js_event event;
96 switch (type) {
98 case EV_KEY:
99 if (code < BTN_MISC || value == 2) return;
100 event.type = JS_EVENT_BUTTON;
101 event.number = joydev->keymap[code - BTN_MISC];
102 event.value = value;
103 break;
105 case EV_ABS:
106 event.type = JS_EVENT_AXIS;
107 event.number = joydev->absmap[code];
108 event.value = joydev_correct(value, joydev->corr + event.number);
109 if (event.value == joydev->abs[event.number]) return;
110 joydev->abs[event.number] = event.value;
111 break;
113 default:
114 return;
117 event.time = jiffies_to_msecs(jiffies);
119 list_for_each_entry(list, &joydev->list, node) {
121 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
123 if (list->startup == joydev->nabs + joydev->nkey)
124 if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
125 list->startup = 0;
127 kill_fasync(&list->fasync, SIGIO, POLL_IN);
130 wake_up_interruptible(&joydev->wait);
133 static int joydev_fasync(int fd, struct file *file, int on)
135 int retval;
136 struct joydev_list *list = file->private_data;
137 retval = fasync_helper(fd, file, on, &list->fasync);
138 return retval < 0 ? retval : 0;
141 static void joydev_free(struct joydev *joydev)
143 joydev_table[joydev->minor] = NULL;
144 kfree(joydev);
147 static int joydev_release(struct inode * inode, struct file * file)
149 struct joydev_list *list = file->private_data;
151 joydev_fasync(-1, file, 0);
153 list_del(&list->node);
155 if (!--list->joydev->open) {
156 if (list->joydev->exist)
157 input_close_device(&list->joydev->handle);
158 else
159 joydev_free(list->joydev);
162 kfree(list);
163 return 0;
166 static int joydev_open(struct inode *inode, struct file *file)
168 struct joydev_list *list;
169 int i = iminor(inode) - JOYDEV_MINOR_BASE;
171 if (i >= JOYDEV_MINORS || !joydev_table[i])
172 return -ENODEV;
174 if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
175 return -ENOMEM;
176 memset(list, 0, sizeof(struct joydev_list));
178 list->joydev = joydev_table[i];
179 list_add_tail(&list->node, &joydev_table[i]->list);
180 file->private_data = list;
182 if (!list->joydev->open++)
183 if (list->joydev->exist)
184 input_open_device(&list->joydev->handle);
186 return 0;
189 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
191 return -EINVAL;
194 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
196 struct joydev_list *list = file->private_data;
197 struct joydev *joydev = list->joydev;
198 struct input_dev *input = joydev->handle.dev;
199 int retval = 0;
201 if (!list->joydev->exist)
202 return -ENODEV;
204 if (count < sizeof(struct js_event))
205 return -EINVAL;
207 if (count == sizeof(struct JS_DATA_TYPE)) {
209 struct JS_DATA_TYPE data;
210 int i;
212 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
213 data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
214 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
215 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
217 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
218 return -EFAULT;
220 list->startup = 0;
221 list->tail = list->head;
223 return sizeof(struct JS_DATA_TYPE);
226 if (list->startup == joydev->nabs + joydev->nkey
227 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
228 return -EAGAIN;
230 retval = wait_event_interruptible(list->joydev->wait,
231 !list->joydev->exist ||
232 list->startup < joydev->nabs + joydev->nkey ||
233 list->head != list->tail);
235 if (retval)
236 return retval;
238 if (!list->joydev->exist)
239 return -ENODEV;
241 while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
243 struct js_event event;
245 event.time = jiffies_to_msecs(jiffies);
247 if (list->startup < joydev->nkey) {
248 event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
249 event.number = list->startup;
250 event.value = !!test_bit(joydev->keypam[event.number], input->key);
251 } else {
252 event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
253 event.number = list->startup - joydev->nkey;
254 event.value = joydev->abs[event.number];
257 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
258 return -EFAULT;
260 list->startup++;
261 retval += sizeof(struct js_event);
264 while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
266 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
267 return -EFAULT;
269 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
270 retval += sizeof(struct js_event);
273 return retval;
276 /* No kernel lock - fine */
277 static unsigned int joydev_poll(struct file *file, poll_table *wait)
279 struct joydev_list *list = file->private_data;
280 poll_wait(file, &list->joydev->wait, wait);
281 return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
282 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
285 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
287 struct input_dev *dev = joydev->handle.dev;
288 int i, j;
290 switch (cmd) {
292 case JS_SET_CAL:
293 return copy_from_user(&joydev->glue.JS_CORR, argp,
294 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
295 case JS_GET_CAL:
296 return copy_to_user(argp, &joydev->glue.JS_CORR,
297 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
298 case JS_SET_TIMEOUT:
299 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
300 case JS_GET_TIMEOUT:
301 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
303 case JSIOCGVERSION:
304 return put_user(JS_VERSION, (__u32 __user *) argp);
305 case JSIOCGAXES:
306 return put_user(joydev->nabs, (__u8 __user *) argp);
307 case JSIOCGBUTTONS:
308 return put_user(joydev->nkey, (__u8 __user *) argp);
309 case JSIOCSCORR:
310 if (copy_from_user(joydev->corr, argp,
311 sizeof(joydev->corr[0]) * joydev->nabs))
312 return -EFAULT;
313 for (i = 0; i < joydev->nabs; i++) {
314 j = joydev->abspam[i];
315 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
317 return 0;
318 case JSIOCGCORR:
319 return copy_to_user(argp, joydev->corr,
320 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
321 case JSIOCSAXMAP:
322 if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
323 return -EFAULT;
324 for (i = 0; i < joydev->nabs; i++) {
325 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
326 joydev->absmap[joydev->abspam[i]] = i;
328 return 0;
329 case JSIOCGAXMAP:
330 return copy_to_user(argp, joydev->abspam,
331 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
332 case JSIOCSBTNMAP:
333 if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
334 return -EFAULT;
335 for (i = 0; i < joydev->nkey; i++) {
336 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
337 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
339 return 0;
340 case JSIOCGBTNMAP:
341 return copy_to_user(argp, joydev->keypam,
342 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
343 default:
344 if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
345 int len;
346 if (!dev->name) return 0;
347 len = strlen(dev->name) + 1;
348 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
349 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
350 return len;
353 return -EINVAL;
356 #ifdef CONFIG_COMPAT
357 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
359 struct joydev_list *list = file->private_data;
360 struct joydev *joydev = list->joydev;
361 void __user *argp = (void __user *)arg;
362 s32 tmp32;
363 struct JS_DATA_SAVE_TYPE_32 ds32;
364 int err;
366 if (!joydev->exist) return -ENODEV;
367 switch(cmd) {
368 case JS_SET_TIMELIMIT:
369 err = get_user(tmp32, (s32 __user *) arg);
370 if (err == 0)
371 joydev->glue.JS_TIMELIMIT = tmp32;
372 break;
373 case JS_GET_TIMELIMIT:
374 tmp32 = joydev->glue.JS_TIMELIMIT;
375 err = put_user(tmp32, (s32 __user *) arg);
376 break;
378 case JS_SET_ALL:
379 err = copy_from_user(&ds32, argp,
380 sizeof(ds32)) ? -EFAULT : 0;
381 if (err == 0) {
382 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
383 joydev->glue.BUSY = ds32.BUSY;
384 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
385 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
386 joydev->glue.JS_SAVE = ds32.JS_SAVE;
387 joydev->glue.JS_CORR = ds32.JS_CORR;
389 break;
391 case JS_GET_ALL:
392 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
393 ds32.BUSY = joydev->glue.BUSY;
394 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
395 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
396 ds32.JS_SAVE = joydev->glue.JS_SAVE;
397 ds32.JS_CORR = joydev->glue.JS_CORR;
399 err = copy_to_user(argp, &ds32,
400 sizeof(ds32)) ? -EFAULT : 0;
401 break;
403 default:
404 err = joydev_ioctl_common(joydev, cmd, argp);
406 return err;
408 #endif /* CONFIG_COMPAT */
410 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
412 struct joydev_list *list = file->private_data;
413 struct joydev *joydev = list->joydev;
414 void __user *argp = (void __user *)arg;
416 if (!joydev->exist) return -ENODEV;
418 switch(cmd) {
419 case JS_SET_TIMELIMIT:
420 return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
421 case JS_GET_TIMELIMIT:
422 return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
423 case JS_SET_ALL:
424 return copy_from_user(&joydev->glue, argp,
425 sizeof(joydev->glue)) ? -EFAULT : 0;
426 case JS_GET_ALL:
427 return copy_to_user(argp, &joydev->glue,
428 sizeof(joydev->glue)) ? -EFAULT : 0;
429 default:
430 return joydev_ioctl_common(joydev, cmd, argp);
434 static struct file_operations joydev_fops = {
435 .owner = THIS_MODULE,
436 .read = joydev_read,
437 .write = joydev_write,
438 .poll = joydev_poll,
439 .open = joydev_open,
440 .release = joydev_release,
441 .ioctl = joydev_ioctl,
442 #ifdef CONFIG_COMPAT
443 .compat_ioctl = joydev_compat_ioctl,
444 #endif
445 .fasync = joydev_fasync,
448 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
450 struct joydev *joydev;
451 struct class_device *cdev;
452 int i, j, t, minor;
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;
460 if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
461 return NULL;
462 memset(joydev, 0, sizeof(struct joydev));
464 INIT_LIST_HEAD(&joydev->list);
465 init_waitqueue_head(&joydev->wait);
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);
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++;
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++;
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++;
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;
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;
512 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
515 joydev_table[minor] = joydev;
517 cdev = class_device_create(&input_class, &dev->cdev,
518 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
519 dev->cdev.dev, joydev->name);
521 /* temporary symlink to keep userspace happy */
522 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
523 joydev->name);
525 return &joydev->handle;
528 static void joydev_disconnect(struct input_handle *handle)
530 struct joydev *joydev = handle->private;
531 struct joydev_list *list;
533 sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name);
534 class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
535 joydev->exist = 0;
537 if (joydev->open) {
538 input_close_device(handle);
539 wake_up_interruptible(&joydev->wait);
540 list_for_each_entry(list, &joydev->list, node)
541 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
542 } else
543 joydev_free(joydev);
546 static struct input_device_id joydev_blacklist[] = {
548 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
549 .evbit = { BIT(EV_KEY) },
550 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
551 }, /* Avoid itouchpads, touchscreens and tablets */
552 { }, /* Terminating entry */
555 static struct input_device_id joydev_ids[] = {
557 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
558 .evbit = { BIT(EV_ABS) },
559 .absbit = { BIT(ABS_X) },
562 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
563 .evbit = { BIT(EV_ABS) },
564 .absbit = { BIT(ABS_WHEEL) },
567 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
568 .evbit = { BIT(EV_ABS) },
569 .absbit = { BIT(ABS_THROTTLE) },
571 { }, /* Terminating entry */
574 MODULE_DEVICE_TABLE(input, joydev_ids);
576 static struct input_handler joydev_handler = {
577 .event = joydev_event,
578 .connect = joydev_connect,
579 .disconnect = joydev_disconnect,
580 .fops = &joydev_fops,
581 .minor = JOYDEV_MINOR_BASE,
582 .name = "joydev",
583 .id_table = joydev_ids,
584 .blacklist = joydev_blacklist,
587 static int __init joydev_init(void)
589 input_register_handler(&joydev_handler);
590 return 0;
593 static void __exit joydev_exit(void)
595 input_unregister_handler(&joydev_handler);
598 module_init(joydev_init);
599 module_exit(joydev_exit);