Root/
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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | |
15 | #include <asm/io.h> |
16 | #include <linux/delay.h> |
17 | #include <linux/errno.h> |
18 | #include <linux/joystick.h> |
19 | #include <linux/input.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/major.h> |
22 | #include <linux/sched.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/mm.h> |
25 | #include <linux/miscdevice.h> |
26 | #include <linux/module.h> |
27 | #include <linux/poll.h> |
28 | #include <linux/init.h> |
29 | #include <linux/device.h> |
30 | #include <linux/cdev.h> |
31 | |
32 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
33 | MODULE_DESCRIPTION("Joystick device interfaces"); |
34 | MODULE_SUPPORTED_DEVICE("input/js"); |
35 | MODULE_LICENSE("GPL"); |
36 | |
37 | #define JOYDEV_MINOR_BASE 0 |
38 | #define JOYDEV_MINORS 16 |
39 | #define JOYDEV_BUFFER_SIZE 64 |
40 | |
41 | struct joydev { |
42 | int open; |
43 | struct input_handle handle; |
44 | wait_queue_head_t wait; |
45 | struct list_head client_list; |
46 | spinlock_t client_lock; /* protects client_list */ |
47 | struct mutex mutex; |
48 | struct device dev; |
49 | struct cdev cdev; |
50 | bool exist; |
51 | |
52 | struct js_corr corr[ABS_CNT]; |
53 | struct JS_DATA_SAVE_TYPE glue; |
54 | int nabs; |
55 | int nkey; |
56 | __u16 keymap[KEY_MAX - BTN_MISC + 1]; |
57 | __u16 keypam[KEY_MAX - BTN_MISC + 1]; |
58 | __u8 absmap[ABS_CNT]; |
59 | __u8 abspam[ABS_CNT]; |
60 | __s16 abs[ABS_CNT]; |
61 | }; |
62 | |
63 | struct joydev_client { |
64 | struct js_event buffer[JOYDEV_BUFFER_SIZE]; |
65 | int head; |
66 | int tail; |
67 | int startup; |
68 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
69 | struct fasync_struct *fasync; |
70 | struct joydev *joydev; |
71 | struct list_head node; |
72 | }; |
73 | |
74 | static int joydev_correct(int value, struct js_corr *corr) |
75 | { |
76 | switch (corr->type) { |
77 | |
78 | case JS_CORR_NONE: |
79 | break; |
80 | |
81 | case JS_CORR_BROKEN: |
82 | value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : |
83 | ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : |
84 | ((corr->coef[2] * (value - corr->coef[0])) >> 14); |
85 | break; |
86 | |
87 | default: |
88 | return 0; |
89 | } |
90 | |
91 | return value < -32767 ? -32767 : (value > 32767 ? 32767 : value); |
92 | } |
93 | |
94 | static void joydev_pass_event(struct joydev_client *client, |
95 | struct js_event *event) |
96 | { |
97 | struct joydev *joydev = client->joydev; |
98 | |
99 | /* |
100 | * IRQs already disabled, just acquire the lock |
101 | */ |
102 | spin_lock(&client->buffer_lock); |
103 | |
104 | client->buffer[client->head] = *event; |
105 | |
106 | if (client->startup == joydev->nabs + joydev->nkey) { |
107 | client->head++; |
108 | client->head &= JOYDEV_BUFFER_SIZE - 1; |
109 | if (client->tail == client->head) |
110 | client->startup = 0; |
111 | } |
112 | |
113 | spin_unlock(&client->buffer_lock); |
114 | |
115 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
116 | } |
117 | |
118 | static void joydev_event(struct input_handle *handle, |
119 | unsigned int type, unsigned int code, int value) |
120 | { |
121 | struct joydev *joydev = handle->private; |
122 | struct joydev_client *client; |
123 | struct js_event event; |
124 | |
125 | switch (type) { |
126 | |
127 | case EV_KEY: |
128 | if (code < BTN_MISC || value == 2) |
129 | return; |
130 | event.type = JS_EVENT_BUTTON; |
131 | event.number = joydev->keymap[code - BTN_MISC]; |
132 | event.value = value; |
133 | break; |
134 | |
135 | case EV_ABS: |
136 | event.type = JS_EVENT_AXIS; |
137 | event.number = joydev->absmap[code]; |
138 | event.value = joydev_correct(value, |
139 | &joydev->corr[event.number]); |
140 | if (event.value == joydev->abs[event.number]) |
141 | return; |
142 | joydev->abs[event.number] = event.value; |
143 | break; |
144 | |
145 | default: |
146 | return; |
147 | } |
148 | |
149 | event.time = jiffies_to_msecs(jiffies); |
150 | |
151 | rcu_read_lock(); |
152 | list_for_each_entry_rcu(client, &joydev->client_list, node) |
153 | joydev_pass_event(client, &event); |
154 | rcu_read_unlock(); |
155 | |
156 | wake_up_interruptible(&joydev->wait); |
157 | } |
158 | |
159 | static int joydev_fasync(int fd, struct file *file, int on) |
160 | { |
161 | struct joydev_client *client = file->private_data; |
162 | |
163 | return fasync_helper(fd, file, on, &client->fasync); |
164 | } |
165 | |
166 | static void joydev_free(struct device *dev) |
167 | { |
168 | struct joydev *joydev = container_of(dev, struct joydev, dev); |
169 | |
170 | input_put_device(joydev->handle.dev); |
171 | kfree(joydev); |
172 | } |
173 | |
174 | static void joydev_attach_client(struct joydev *joydev, |
175 | struct joydev_client *client) |
176 | { |
177 | spin_lock(&joydev->client_lock); |
178 | list_add_tail_rcu(&client->node, &joydev->client_list); |
179 | spin_unlock(&joydev->client_lock); |
180 | } |
181 | |
182 | static void joydev_detach_client(struct joydev *joydev, |
183 | struct joydev_client *client) |
184 | { |
185 | spin_lock(&joydev->client_lock); |
186 | list_del_rcu(&client->node); |
187 | spin_unlock(&joydev->client_lock); |
188 | synchronize_rcu(); |
189 | } |
190 | |
191 | static int joydev_open_device(struct joydev *joydev) |
192 | { |
193 | int retval; |
194 | |
195 | retval = mutex_lock_interruptible(&joydev->mutex); |
196 | if (retval) |
197 | return retval; |
198 | |
199 | if (!joydev->exist) |
200 | retval = -ENODEV; |
201 | else if (!joydev->open++) { |
202 | retval = input_open_device(&joydev->handle); |
203 | if (retval) |
204 | joydev->open--; |
205 | } |
206 | |
207 | mutex_unlock(&joydev->mutex); |
208 | return retval; |
209 | } |
210 | |
211 | static void joydev_close_device(struct joydev *joydev) |
212 | { |
213 | mutex_lock(&joydev->mutex); |
214 | |
215 | if (joydev->exist && !--joydev->open) |
216 | input_close_device(&joydev->handle); |
217 | |
218 | mutex_unlock(&joydev->mutex); |
219 | } |
220 | |
221 | /* |
222 | * Wake up users waiting for IO so they can disconnect from |
223 | * dead device. |
224 | */ |
225 | static void joydev_hangup(struct joydev *joydev) |
226 | { |
227 | struct joydev_client *client; |
228 | |
229 | spin_lock(&joydev->client_lock); |
230 | list_for_each_entry(client, &joydev->client_list, node) |
231 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
232 | spin_unlock(&joydev->client_lock); |
233 | |
234 | wake_up_interruptible(&joydev->wait); |
235 | } |
236 | |
237 | static int joydev_release(struct inode *inode, struct file *file) |
238 | { |
239 | struct joydev_client *client = file->private_data; |
240 | struct joydev *joydev = client->joydev; |
241 | |
242 | joydev_detach_client(joydev, client); |
243 | kfree(client); |
244 | |
245 | joydev_close_device(joydev); |
246 | |
247 | return 0; |
248 | } |
249 | |
250 | static int joydev_open(struct inode *inode, struct file *file) |
251 | { |
252 | struct joydev *joydev = |
253 | container_of(inode->i_cdev, struct joydev, cdev); |
254 | struct joydev_client *client; |
255 | int error; |
256 | |
257 | client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); |
258 | if (!client) |
259 | return -ENOMEM; |
260 | |
261 | spin_lock_init(&client->buffer_lock); |
262 | client->joydev = joydev; |
263 | joydev_attach_client(joydev, client); |
264 | |
265 | error = joydev_open_device(joydev); |
266 | if (error) |
267 | goto err_free_client; |
268 | |
269 | file->private_data = client; |
270 | nonseekable_open(inode, file); |
271 | |
272 | return 0; |
273 | |
274 | err_free_client: |
275 | joydev_detach_client(joydev, client); |
276 | kfree(client); |
277 | return error; |
278 | } |
279 | |
280 | static int joydev_generate_startup_event(struct joydev_client *client, |
281 | struct input_dev *input, |
282 | struct js_event *event) |
283 | { |
284 | struct joydev *joydev = client->joydev; |
285 | int have_event; |
286 | |
287 | spin_lock_irq(&client->buffer_lock); |
288 | |
289 | have_event = client->startup < joydev->nabs + joydev->nkey; |
290 | |
291 | if (have_event) { |
292 | |
293 | event->time = jiffies_to_msecs(jiffies); |
294 | if (client->startup < joydev->nkey) { |
295 | event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; |
296 | event->number = client->startup; |
297 | event->value = !!test_bit(joydev->keypam[event->number], |
298 | input->key); |
299 | } else { |
300 | event->type = JS_EVENT_AXIS | JS_EVENT_INIT; |
301 | event->number = client->startup - joydev->nkey; |
302 | event->value = joydev->abs[event->number]; |
303 | } |
304 | client->startup++; |
305 | } |
306 | |
307 | spin_unlock_irq(&client->buffer_lock); |
308 | |
309 | return have_event; |
310 | } |
311 | |
312 | static int joydev_fetch_next_event(struct joydev_client *client, |
313 | struct js_event *event) |
314 | { |
315 | int have_event; |
316 | |
317 | spin_lock_irq(&client->buffer_lock); |
318 | |
319 | have_event = client->head != client->tail; |
320 | if (have_event) { |
321 | *event = client->buffer[client->tail++]; |
322 | client->tail &= JOYDEV_BUFFER_SIZE - 1; |
323 | } |
324 | |
325 | spin_unlock_irq(&client->buffer_lock); |
326 | |
327 | return have_event; |
328 | } |
329 | |
330 | /* |
331 | * Old joystick interface |
332 | */ |
333 | static ssize_t joydev_0x_read(struct joydev_client *client, |
334 | struct input_dev *input, |
335 | char __user *buf) |
336 | { |
337 | struct joydev *joydev = client->joydev; |
338 | struct JS_DATA_TYPE data; |
339 | int i; |
340 | |
341 | spin_lock_irq(&input->event_lock); |
342 | |
343 | /* |
344 | * Get device state |
345 | */ |
346 | for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) |
347 | data.buttons |= |
348 | test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; |
349 | data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; |
350 | data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; |
351 | |
352 | /* |
353 | * Reset reader's event queue |
354 | */ |
355 | spin_lock(&client->buffer_lock); |
356 | client->startup = 0; |
357 | client->tail = client->head; |
358 | spin_unlock(&client->buffer_lock); |
359 | |
360 | spin_unlock_irq(&input->event_lock); |
361 | |
362 | if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) |
363 | return -EFAULT; |
364 | |
365 | return sizeof(struct JS_DATA_TYPE); |
366 | } |
367 | |
368 | static inline int joydev_data_pending(struct joydev_client *client) |
369 | { |
370 | struct joydev *joydev = client->joydev; |
371 | |
372 | return client->startup < joydev->nabs + joydev->nkey || |
373 | client->head != client->tail; |
374 | } |
375 | |
376 | static ssize_t joydev_read(struct file *file, char __user *buf, |
377 | size_t count, loff_t *ppos) |
378 | { |
379 | struct joydev_client *client = file->private_data; |
380 | struct joydev *joydev = client->joydev; |
381 | struct input_dev *input = joydev->handle.dev; |
382 | struct js_event event; |
383 | int retval; |
384 | |
385 | if (!joydev->exist) |
386 | return -ENODEV; |
387 | |
388 | if (count < sizeof(struct js_event)) |
389 | return -EINVAL; |
390 | |
391 | if (count == sizeof(struct JS_DATA_TYPE)) |
392 | return joydev_0x_read(client, input, buf); |
393 | |
394 | if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) |
395 | return -EAGAIN; |
396 | |
397 | retval = wait_event_interruptible(joydev->wait, |
398 | !joydev->exist || joydev_data_pending(client)); |
399 | if (retval) |
400 | return retval; |
401 | |
402 | if (!joydev->exist) |
403 | return -ENODEV; |
404 | |
405 | while (retval + sizeof(struct js_event) <= count && |
406 | joydev_generate_startup_event(client, input, &event)) { |
407 | |
408 | if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) |
409 | return -EFAULT; |
410 | |
411 | retval += sizeof(struct js_event); |
412 | } |
413 | |
414 | while (retval + sizeof(struct js_event) <= count && |
415 | joydev_fetch_next_event(client, &event)) { |
416 | |
417 | if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) |
418 | return -EFAULT; |
419 | |
420 | retval += sizeof(struct js_event); |
421 | } |
422 | |
423 | return retval; |
424 | } |
425 | |
426 | /* No kernel lock - fine */ |
427 | static unsigned int joydev_poll(struct file *file, poll_table *wait) |
428 | { |
429 | struct joydev_client *client = file->private_data; |
430 | struct joydev *joydev = client->joydev; |
431 | |
432 | poll_wait(file, &joydev->wait, wait); |
433 | return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) | |
434 | (joydev->exist ? 0 : (POLLHUP | POLLERR)); |
435 | } |
436 | |
437 | static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, |
438 | void __user *argp, size_t len) |
439 | { |
440 | __u8 *abspam; |
441 | int i; |
442 | int retval = 0; |
443 | |
444 | len = min(len, sizeof(joydev->abspam)); |
445 | |
446 | /* Validate the map. */ |
447 | abspam = kmalloc(len, GFP_KERNEL); |
448 | if (!abspam) |
449 | return -ENOMEM; |
450 | |
451 | if (copy_from_user(abspam, argp, len)) { |
452 | retval = -EFAULT; |
453 | goto out; |
454 | } |
455 | |
456 | for (i = 0; i < joydev->nabs; i++) { |
457 | if (abspam[i] > ABS_MAX) { |
458 | retval = -EINVAL; |
459 | goto out; |
460 | } |
461 | } |
462 | |
463 | memcpy(joydev->abspam, abspam, len); |
464 | |
465 | for (i = 0; i < joydev->nabs; i++) |
466 | joydev->absmap[joydev->abspam[i]] = i; |
467 | |
468 | out: |
469 | kfree(abspam); |
470 | return retval; |
471 | } |
472 | |
473 | static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, |
474 | void __user *argp, size_t len) |
475 | { |
476 | __u16 *keypam; |
477 | int i; |
478 | int retval = 0; |
479 | |
480 | len = min(len, sizeof(joydev->keypam)); |
481 | |
482 | /* Validate the map. */ |
483 | keypam = kmalloc(len, GFP_KERNEL); |
484 | if (!keypam) |
485 | return -ENOMEM; |
486 | |
487 | if (copy_from_user(keypam, argp, len)) { |
488 | retval = -EFAULT; |
489 | goto out; |
490 | } |
491 | |
492 | for (i = 0; i < joydev->nkey; i++) { |
493 | if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { |
494 | retval = -EINVAL; |
495 | goto out; |
496 | } |
497 | } |
498 | |
499 | memcpy(joydev->keypam, keypam, len); |
500 | |
501 | for (i = 0; i < joydev->nkey; i++) |
502 | joydev->keymap[keypam[i] - BTN_MISC] = i; |
503 | |
504 | out: |
505 | kfree(keypam); |
506 | return retval; |
507 | } |
508 | |
509 | |
510 | static int joydev_ioctl_common(struct joydev *joydev, |
511 | unsigned int cmd, void __user *argp) |
512 | { |
513 | struct input_dev *dev = joydev->handle.dev; |
514 | size_t len; |
515 | int i; |
516 | const char *name; |
517 | |
518 | /* Process fixed-sized commands. */ |
519 | switch (cmd) { |
520 | |
521 | case JS_SET_CAL: |
522 | return copy_from_user(&joydev->glue.JS_CORR, argp, |
523 | sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; |
524 | |
525 | case JS_GET_CAL: |
526 | return copy_to_user(argp, &joydev->glue.JS_CORR, |
527 | sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; |
528 | |
529 | case JS_SET_TIMEOUT: |
530 | return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); |
531 | |
532 | case JS_GET_TIMEOUT: |
533 | return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); |
534 | |
535 | case JSIOCGVERSION: |
536 | return put_user(JS_VERSION, (__u32 __user *) argp); |
537 | |
538 | case JSIOCGAXES: |
539 | return put_user(joydev->nabs, (__u8 __user *) argp); |
540 | |
541 | case JSIOCGBUTTONS: |
542 | return put_user(joydev->nkey, (__u8 __user *) argp); |
543 | |
544 | case JSIOCSCORR: |
545 | if (copy_from_user(joydev->corr, argp, |
546 | sizeof(joydev->corr[0]) * joydev->nabs)) |
547 | return -EFAULT; |
548 | |
549 | for (i = 0; i < joydev->nabs; i++) { |
550 | int val = input_abs_get_val(dev, joydev->abspam[i]); |
551 | joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); |
552 | } |
553 | return 0; |
554 | |
555 | case JSIOCGCORR: |
556 | return copy_to_user(argp, joydev->corr, |
557 | sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; |
558 | |
559 | } |
560 | |
561 | /* |
562 | * Process variable-sized commands (the axis and button map commands |
563 | * are considered variable-sized to decouple them from the values of |
564 | * ABS_MAX and KEY_MAX). |
565 | */ |
566 | switch (cmd & ~IOCSIZE_MASK) { |
567 | |
568 | case (JSIOCSAXMAP & ~IOCSIZE_MASK): |
569 | return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); |
570 | |
571 | case (JSIOCGAXMAP & ~IOCSIZE_MASK): |
572 | len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); |
573 | return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; |
574 | |
575 | case (JSIOCSBTNMAP & ~IOCSIZE_MASK): |
576 | return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); |
577 | |
578 | case (JSIOCGBTNMAP & ~IOCSIZE_MASK): |
579 | len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); |
580 | return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; |
581 | |
582 | case JSIOCGNAME(0): |
583 | name = dev->name; |
584 | if (!name) |
585 | return 0; |
586 | |
587 | len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); |
588 | return copy_to_user(argp, name, len) ? -EFAULT : len; |
589 | } |
590 | |
591 | return -EINVAL; |
592 | } |
593 | |
594 | #ifdef CONFIG_COMPAT |
595 | static long joydev_compat_ioctl(struct file *file, |
596 | unsigned int cmd, unsigned long arg) |
597 | { |
598 | struct joydev_client *client = file->private_data; |
599 | struct joydev *joydev = client->joydev; |
600 | void __user *argp = (void __user *)arg; |
601 | s32 tmp32; |
602 | struct JS_DATA_SAVE_TYPE_32 ds32; |
603 | int retval; |
604 | |
605 | retval = mutex_lock_interruptible(&joydev->mutex); |
606 | if (retval) |
607 | return retval; |
608 | |
609 | if (!joydev->exist) { |
610 | retval = -ENODEV; |
611 | goto out; |
612 | } |
613 | |
614 | switch (cmd) { |
615 | |
616 | case JS_SET_TIMELIMIT: |
617 | retval = get_user(tmp32, (s32 __user *) arg); |
618 | if (retval == 0) |
619 | joydev->glue.JS_TIMELIMIT = tmp32; |
620 | break; |
621 | |
622 | case JS_GET_TIMELIMIT: |
623 | tmp32 = joydev->glue.JS_TIMELIMIT; |
624 | retval = put_user(tmp32, (s32 __user *) arg); |
625 | break; |
626 | |
627 | case JS_SET_ALL: |
628 | retval = copy_from_user(&ds32, argp, |
629 | sizeof(ds32)) ? -EFAULT : 0; |
630 | if (retval == 0) { |
631 | joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; |
632 | joydev->glue.BUSY = ds32.BUSY; |
633 | joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; |
634 | joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; |
635 | joydev->glue.JS_SAVE = ds32.JS_SAVE; |
636 | joydev->glue.JS_CORR = ds32.JS_CORR; |
637 | } |
638 | break; |
639 | |
640 | case JS_GET_ALL: |
641 | ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; |
642 | ds32.BUSY = joydev->glue.BUSY; |
643 | ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; |
644 | ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; |
645 | ds32.JS_SAVE = joydev->glue.JS_SAVE; |
646 | ds32.JS_CORR = joydev->glue.JS_CORR; |
647 | |
648 | retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; |
649 | break; |
650 | |
651 | default: |
652 | retval = joydev_ioctl_common(joydev, cmd, argp); |
653 | break; |
654 | } |
655 | |
656 | out: |
657 | mutex_unlock(&joydev->mutex); |
658 | return retval; |
659 | } |
660 | #endif /* CONFIG_COMPAT */ |
661 | |
662 | static long joydev_ioctl(struct file *file, |
663 | unsigned int cmd, unsigned long arg) |
664 | { |
665 | struct joydev_client *client = file->private_data; |
666 | struct joydev *joydev = client->joydev; |
667 | void __user *argp = (void __user *)arg; |
668 | int retval; |
669 | |
670 | retval = mutex_lock_interruptible(&joydev->mutex); |
671 | if (retval) |
672 | return retval; |
673 | |
674 | if (!joydev->exist) { |
675 | retval = -ENODEV; |
676 | goto out; |
677 | } |
678 | |
679 | switch (cmd) { |
680 | |
681 | case JS_SET_TIMELIMIT: |
682 | retval = get_user(joydev->glue.JS_TIMELIMIT, |
683 | (long __user *) arg); |
684 | break; |
685 | |
686 | case JS_GET_TIMELIMIT: |
687 | retval = put_user(joydev->glue.JS_TIMELIMIT, |
688 | (long __user *) arg); |
689 | break; |
690 | |
691 | case JS_SET_ALL: |
692 | retval = copy_from_user(&joydev->glue, argp, |
693 | sizeof(joydev->glue)) ? -EFAULT : 0; |
694 | break; |
695 | |
696 | case JS_GET_ALL: |
697 | retval = copy_to_user(argp, &joydev->glue, |
698 | sizeof(joydev->glue)) ? -EFAULT : 0; |
699 | break; |
700 | |
701 | default: |
702 | retval = joydev_ioctl_common(joydev, cmd, argp); |
703 | break; |
704 | } |
705 | out: |
706 | mutex_unlock(&joydev->mutex); |
707 | return retval; |
708 | } |
709 | |
710 | static const struct file_operations joydev_fops = { |
711 | .owner = THIS_MODULE, |
712 | .read = joydev_read, |
713 | .poll = joydev_poll, |
714 | .open = joydev_open, |
715 | .release = joydev_release, |
716 | .unlocked_ioctl = joydev_ioctl, |
717 | #ifdef CONFIG_COMPAT |
718 | .compat_ioctl = joydev_compat_ioctl, |
719 | #endif |
720 | .fasync = joydev_fasync, |
721 | .llseek = no_llseek, |
722 | }; |
723 | |
724 | /* |
725 | * Mark device non-existent. This disables writes, ioctls and |
726 | * prevents new users from opening the device. Already posted |
727 | * blocking reads will stay, however new ones will fail. |
728 | */ |
729 | static void joydev_mark_dead(struct joydev *joydev) |
730 | { |
731 | mutex_lock(&joydev->mutex); |
732 | joydev->exist = false; |
733 | mutex_unlock(&joydev->mutex); |
734 | } |
735 | |
736 | static void joydev_cleanup(struct joydev *joydev) |
737 | { |
738 | struct input_handle *handle = &joydev->handle; |
739 | |
740 | joydev_mark_dead(joydev); |
741 | joydev_hangup(joydev); |
742 | |
743 | cdev_del(&joydev->cdev); |
744 | |
745 | /* joydev is marked dead so no one else accesses joydev->open */ |
746 | if (joydev->open) |
747 | input_close_device(handle); |
748 | } |
749 | |
750 | |
751 | static bool joydev_match(struct input_handler *handler, struct input_dev *dev) |
752 | { |
753 | /* Avoid touchpads and touchscreens */ |
754 | if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit)) |
755 | return false; |
756 | |
757 | /* Avoid tablets, digitisers and similar devices */ |
758 | if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit)) |
759 | return false; |
760 | |
761 | return true; |
762 | } |
763 | |
764 | static int joydev_connect(struct input_handler *handler, struct input_dev *dev, |
765 | const struct input_device_id *id) |
766 | { |
767 | struct joydev *joydev; |
768 | int i, j, t, minor, dev_no; |
769 | int error; |
770 | |
771 | minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true); |
772 | if (minor < 0) { |
773 | error = minor; |
774 | pr_err("failed to reserve new minor: %d\n", error); |
775 | return error; |
776 | } |
777 | |
778 | joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); |
779 | if (!joydev) { |
780 | error = -ENOMEM; |
781 | goto err_free_minor; |
782 | } |
783 | |
784 | INIT_LIST_HEAD(&joydev->client_list); |
785 | spin_lock_init(&joydev->client_lock); |
786 | mutex_init(&joydev->mutex); |
787 | init_waitqueue_head(&joydev->wait); |
788 | joydev->exist = true; |
789 | |
790 | dev_no = minor; |
791 | /* Normalize device number if it falls into legacy range */ |
792 | if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS) |
793 | dev_no -= JOYDEV_MINOR_BASE; |
794 | dev_set_name(&joydev->dev, "js%d", dev_no); |
795 | |
796 | joydev->handle.dev = input_get_device(dev); |
797 | joydev->handle.name = dev_name(&joydev->dev); |
798 | joydev->handle.handler = handler; |
799 | joydev->handle.private = joydev; |
800 | |
801 | for (i = 0; i < ABS_CNT; i++) |
802 | if (test_bit(i, dev->absbit)) { |
803 | joydev->absmap[i] = joydev->nabs; |
804 | joydev->abspam[joydev->nabs] = i; |
805 | joydev->nabs++; |
806 | } |
807 | |
808 | for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) |
809 | if (test_bit(i + BTN_MISC, dev->keybit)) { |
810 | joydev->keymap[i] = joydev->nkey; |
811 | joydev->keypam[joydev->nkey] = i + BTN_MISC; |
812 | joydev->nkey++; |
813 | } |
814 | |
815 | for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) |
816 | if (test_bit(i + BTN_MISC, dev->keybit)) { |
817 | joydev->keymap[i] = joydev->nkey; |
818 | joydev->keypam[joydev->nkey] = i + BTN_MISC; |
819 | joydev->nkey++; |
820 | } |
821 | |
822 | for (i = 0; i < joydev->nabs; i++) { |
823 | j = joydev->abspam[i]; |
824 | if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) { |
825 | joydev->corr[i].type = JS_CORR_NONE; |
826 | joydev->abs[i] = input_abs_get_val(dev, j); |
827 | continue; |
828 | } |
829 | joydev->corr[i].type = JS_CORR_BROKEN; |
830 | joydev->corr[i].prec = input_abs_get_fuzz(dev, j); |
831 | |
832 | t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2; |
833 | joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j); |
834 | joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j); |
835 | |
836 | t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2 |
837 | - 2 * input_abs_get_flat(dev, j); |
838 | if (t) { |
839 | joydev->corr[i].coef[2] = (1 << 29) / t; |
840 | joydev->corr[i].coef[3] = (1 << 29) / t; |
841 | |
842 | joydev->abs[i] = |
843 | joydev_correct(input_abs_get_val(dev, j), |
844 | joydev->corr + i); |
845 | } |
846 | } |
847 | |
848 | joydev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
849 | joydev->dev.class = &input_class; |
850 | joydev->dev.parent = &dev->dev; |
851 | joydev->dev.release = joydev_free; |
852 | device_initialize(&joydev->dev); |
853 | |
854 | error = input_register_handle(&joydev->handle); |
855 | if (error) |
856 | goto err_free_joydev; |
857 | |
858 | cdev_init(&joydev->cdev, &joydev_fops); |
859 | joydev->cdev.kobj.parent = &joydev->dev.kobj; |
860 | error = cdev_add(&joydev->cdev, joydev->dev.devt, 1); |
861 | if (error) |
862 | goto err_unregister_handle; |
863 | |
864 | error = device_add(&joydev->dev); |
865 | if (error) |
866 | goto err_cleanup_joydev; |
867 | |
868 | return 0; |
869 | |
870 | err_cleanup_joydev: |
871 | joydev_cleanup(joydev); |
872 | err_unregister_handle: |
873 | input_unregister_handle(&joydev->handle); |
874 | err_free_joydev: |
875 | put_device(&joydev->dev); |
876 | err_free_minor: |
877 | input_free_minor(minor); |
878 | return error; |
879 | } |
880 | |
881 | static void joydev_disconnect(struct input_handle *handle) |
882 | { |
883 | struct joydev *joydev = handle->private; |
884 | |
885 | device_del(&joydev->dev); |
886 | joydev_cleanup(joydev); |
887 | input_free_minor(MINOR(joydev->dev.devt)); |
888 | input_unregister_handle(handle); |
889 | put_device(&joydev->dev); |
890 | } |
891 | |
892 | static const struct input_device_id joydev_ids[] = { |
893 | { |
894 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
895 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
896 | .evbit = { BIT_MASK(EV_ABS) }, |
897 | .absbit = { BIT_MASK(ABS_X) }, |
898 | }, |
899 | { |
900 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
901 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
902 | .evbit = { BIT_MASK(EV_ABS) }, |
903 | .absbit = { BIT_MASK(ABS_WHEEL) }, |
904 | }, |
905 | { |
906 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
907 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
908 | .evbit = { BIT_MASK(EV_ABS) }, |
909 | .absbit = { BIT_MASK(ABS_THROTTLE) }, |
910 | }, |
911 | { |
912 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
913 | INPUT_DEVICE_ID_MATCH_KEYBIT, |
914 | .evbit = { BIT_MASK(EV_KEY) }, |
915 | .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, |
916 | }, |
917 | { |
918 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
919 | INPUT_DEVICE_ID_MATCH_KEYBIT, |
920 | .evbit = { BIT_MASK(EV_KEY) }, |
921 | .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, |
922 | }, |
923 | { |
924 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
925 | INPUT_DEVICE_ID_MATCH_KEYBIT, |
926 | .evbit = { BIT_MASK(EV_KEY) }, |
927 | .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, |
928 | }, |
929 | { } /* Terminating entry */ |
930 | }; |
931 | |
932 | MODULE_DEVICE_TABLE(input, joydev_ids); |
933 | |
934 | static struct input_handler joydev_handler = { |
935 | .event = joydev_event, |
936 | .match = joydev_match, |
937 | .connect = joydev_connect, |
938 | .disconnect = joydev_disconnect, |
939 | .legacy_minors = true, |
940 | .minor = JOYDEV_MINOR_BASE, |
941 | .name = "joydev", |
942 | .id_table = joydev_ids, |
943 | }; |
944 | |
945 | static int __init joydev_init(void) |
946 | { |
947 | return input_register_handler(&joydev_handler); |
948 | } |
949 | |
950 | static void __exit joydev_exit(void) |
951 | { |
952 | input_unregister_handler(&joydev_handler); |
953 | } |
954 | |
955 | module_init(joydev_init); |
956 | module_exit(joydev_exit); |
957 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9