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1 | /* | |
2 | * Input driver to ExplorerPS/2 device driver module. | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | * Copyright (c) 2004 Dmitry Torokhov | |
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 version 2 as published by | |
9 | * the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #define MOUSEDEV_MINOR_BASE 32 | |
15 | #define MOUSEDEV_MINORS 31 | |
16 | #define MOUSEDEV_MIX 63 | |
17 | ||
18 | #include <linux/sched.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/poll.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/input.h> | |
24 | #include <linux/random.h> | |
25 | #include <linux/major.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/cdev.h> | |
28 | #include <linux/kernel.h> | |
29 | ||
30 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
31 | MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
34 | #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X | |
35 | #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 | |
36 | #endif | |
37 | #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y | |
38 | #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 | |
39 | #endif | |
40 | ||
41 | static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; | |
42 | module_param(xres, uint, 0644); | |
43 | MODULE_PARM_DESC(xres, "Horizontal screen resolution"); | |
44 | ||
45 | static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; | |
46 | module_param(yres, uint, 0644); | |
47 | MODULE_PARM_DESC(yres, "Vertical screen resolution"); | |
48 | ||
49 | static unsigned tap_time = 200; | |
50 | module_param(tap_time, uint, 0644); | |
51 | MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); | |
52 | ||
53 | struct mousedev_hw_data { | |
54 | int dx, dy, dz; | |
55 | int x, y; | |
56 | int abs_event; | |
57 | unsigned long buttons; | |
58 | }; | |
59 | ||
60 | struct mousedev { | |
61 | int open; | |
62 | struct input_handle handle; | |
63 | wait_queue_head_t wait; | |
64 | struct list_head client_list; | |
65 | spinlock_t client_lock; /* protects client_list */ | |
66 | struct mutex mutex; | |
67 | struct device dev; | |
68 | struct cdev cdev; | |
69 | bool exist; | |
70 | ||
71 | struct list_head mixdev_node; | |
72 | bool opened_by_mixdev; | |
73 | ||
74 | struct mousedev_hw_data packet; | |
75 | unsigned int pkt_count; | |
76 | int old_x[4], old_y[4]; | |
77 | int frac_dx, frac_dy; | |
78 | unsigned long touch; | |
79 | ||
80 | int (*open_device)(struct mousedev *mousedev); | |
81 | void (*close_device)(struct mousedev *mousedev); | |
82 | }; | |
83 | ||
84 | enum mousedev_emul { | |
85 | MOUSEDEV_EMUL_PS2, | |
86 | MOUSEDEV_EMUL_IMPS, | |
87 | MOUSEDEV_EMUL_EXPS | |
88 | }; | |
89 | ||
90 | struct mousedev_motion { | |
91 | int dx, dy, dz; | |
92 | unsigned long buttons; | |
93 | }; | |
94 | ||
95 | #define PACKET_QUEUE_LEN 16 | |
96 | struct mousedev_client { | |
97 | struct fasync_struct *fasync; | |
98 | struct mousedev *mousedev; | |
99 | struct list_head node; | |
100 | ||
101 | struct mousedev_motion packets[PACKET_QUEUE_LEN]; | |
102 | unsigned int head, tail; | |
103 | spinlock_t packet_lock; | |
104 | int pos_x, pos_y; | |
105 | ||
106 | signed char ps2[6]; | |
107 | unsigned char ready, buffer, bufsiz; | |
108 | unsigned char imexseq, impsseq; | |
109 | enum mousedev_emul mode; | |
110 | unsigned long last_buttons; | |
111 | }; | |
112 | ||
113 | #define MOUSEDEV_SEQ_LEN 6 | |
114 | ||
115 | static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; | |
116 | static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; | |
117 | ||
118 | static struct mousedev *mousedev_mix; | |
119 | static LIST_HEAD(mousedev_mix_list); | |
120 | ||
121 | #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) | |
122 | #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) | |
123 | ||
124 | static void mousedev_touchpad_event(struct input_dev *dev, | |
125 | struct mousedev *mousedev, | |
126 | unsigned int code, int value) | |
127 | { | |
128 | int size, tmp; | |
129 | enum { FRACTION_DENOM = 128 }; | |
130 | ||
131 | switch (code) { | |
132 | ||
133 | case ABS_X: | |
134 | ||
135 | fx(0) = value; | |
136 | if (mousedev->touch && mousedev->pkt_count >= 2) { | |
137 | size = input_abs_get_max(dev, ABS_X) - | |
138 | input_abs_get_min(dev, ABS_X); | |
139 | if (size == 0) | |
140 | size = 256 * 2; | |
141 | ||
142 | tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; | |
143 | tmp += mousedev->frac_dx; | |
144 | mousedev->packet.dx = tmp / FRACTION_DENOM; | |
145 | mousedev->frac_dx = | |
146 | tmp - mousedev->packet.dx * FRACTION_DENOM; | |
147 | } | |
148 | break; | |
149 | ||
150 | case ABS_Y: | |
151 | fy(0) = value; | |
152 | if (mousedev->touch && mousedev->pkt_count >= 2) { | |
153 | /* use X size for ABS_Y to keep the same scale */ | |
154 | size = input_abs_get_max(dev, ABS_X) - | |
155 | input_abs_get_min(dev, ABS_X); | |
156 | if (size == 0) | |
157 | size = 256 * 2; | |
158 | ||
159 | tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; | |
160 | tmp += mousedev->frac_dy; | |
161 | mousedev->packet.dy = tmp / FRACTION_DENOM; | |
162 | mousedev->frac_dy = tmp - | |
163 | mousedev->packet.dy * FRACTION_DENOM; | |
164 | } | |
165 | break; | |
166 | } | |
167 | } | |
168 | ||
169 | static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, | |
170 | unsigned int code, int value) | |
171 | { | |
172 | int min, max, size; | |
173 | ||
174 | switch (code) { | |
175 | ||
176 | case ABS_X: | |
177 | min = input_abs_get_min(dev, ABS_X); | |
178 | max = input_abs_get_max(dev, ABS_X); | |
179 | ||
180 | size = max - min; | |
181 | if (size == 0) | |
182 | size = xres ? : 1; | |
183 | ||
184 | value = clamp(value, min, max); | |
185 | ||
186 | mousedev->packet.x = ((value - min) * xres) / size; | |
187 | mousedev->packet.abs_event = 1; | |
188 | break; | |
189 | ||
190 | case ABS_Y: | |
191 | min = input_abs_get_min(dev, ABS_Y); | |
192 | max = input_abs_get_max(dev, ABS_Y); | |
193 | ||
194 | size = max - min; | |
195 | if (size == 0) | |
196 | size = yres ? : 1; | |
197 | ||
198 | value = clamp(value, min, max); | |
199 | ||
200 | mousedev->packet.y = yres - ((value - min) * yres) / size; | |
201 | mousedev->packet.abs_event = 1; | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | static void mousedev_rel_event(struct mousedev *mousedev, | |
207 | unsigned int code, int value) | |
208 | { | |
209 | switch (code) { | |
210 | case REL_X: | |
211 | mousedev->packet.dx += value; | |
212 | break; | |
213 | ||
214 | case REL_Y: | |
215 | mousedev->packet.dy -= value; | |
216 | break; | |
217 | ||
218 | case REL_WHEEL: | |
219 | mousedev->packet.dz -= value; | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | static void mousedev_key_event(struct mousedev *mousedev, | |
225 | unsigned int code, int value) | |
226 | { | |
227 | int index; | |
228 | ||
229 | switch (code) { | |
230 | ||
231 | case BTN_TOUCH: | |
232 | case BTN_0: | |
233 | case BTN_LEFT: index = 0; break; | |
234 | ||
235 | case BTN_STYLUS: | |
236 | case BTN_1: | |
237 | case BTN_RIGHT: index = 1; break; | |
238 | ||
239 | case BTN_2: | |
240 | case BTN_FORWARD: | |
241 | case BTN_STYLUS2: | |
242 | case BTN_MIDDLE: index = 2; break; | |
243 | ||
244 | case BTN_3: | |
245 | case BTN_BACK: | |
246 | case BTN_SIDE: index = 3; break; | |
247 | ||
248 | case BTN_4: | |
249 | case BTN_EXTRA: index = 4; break; | |
250 | ||
251 | default: return; | |
252 | } | |
253 | ||
254 | if (value) { | |
255 | set_bit(index, &mousedev->packet.buttons); | |
256 | set_bit(index, &mousedev_mix->packet.buttons); | |
257 | } else { | |
258 | clear_bit(index, &mousedev->packet.buttons); | |
259 | clear_bit(index, &mousedev_mix->packet.buttons); | |
260 | } | |
261 | } | |
262 | ||
263 | static void mousedev_notify_readers(struct mousedev *mousedev, | |
264 | struct mousedev_hw_data *packet) | |
265 | { | |
266 | struct mousedev_client *client; | |
267 | struct mousedev_motion *p; | |
268 | unsigned int new_head; | |
269 | int wake_readers = 0; | |
270 | ||
271 | rcu_read_lock(); | |
272 | list_for_each_entry_rcu(client, &mousedev->client_list, node) { | |
273 | ||
274 | /* Just acquire the lock, interrupts already disabled */ | |
275 | spin_lock(&client->packet_lock); | |
276 | ||
277 | p = &client->packets[client->head]; | |
278 | if (client->ready && p->buttons != mousedev->packet.buttons) { | |
279 | new_head = (client->head + 1) % PACKET_QUEUE_LEN; | |
280 | if (new_head != client->tail) { | |
281 | p = &client->packets[client->head = new_head]; | |
282 | memset(p, 0, sizeof(struct mousedev_motion)); | |
283 | } | |
284 | } | |
285 | ||
286 | if (packet->abs_event) { | |
287 | p->dx += packet->x - client->pos_x; | |
288 | p->dy += packet->y - client->pos_y; | |
289 | client->pos_x = packet->x; | |
290 | client->pos_y = packet->y; | |
291 | } | |
292 | ||
293 | client->pos_x += packet->dx; | |
294 | client->pos_x = client->pos_x < 0 ? | |
295 | 0 : (client->pos_x >= xres ? xres : client->pos_x); | |
296 | client->pos_y += packet->dy; | |
297 | client->pos_y = client->pos_y < 0 ? | |
298 | 0 : (client->pos_y >= yres ? yres : client->pos_y); | |
299 | ||
300 | p->dx += packet->dx; | |
301 | p->dy += packet->dy; | |
302 | p->dz += packet->dz; | |
303 | p->buttons = mousedev->packet.buttons; | |
304 | ||
305 | if (p->dx || p->dy || p->dz || | |
306 | p->buttons != client->last_buttons) | |
307 | client->ready = 1; | |
308 | ||
309 | spin_unlock(&client->packet_lock); | |
310 | ||
311 | if (client->ready) { | |
312 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
313 | wake_readers = 1; | |
314 | } | |
315 | } | |
316 | rcu_read_unlock(); | |
317 | ||
318 | if (wake_readers) | |
319 | wake_up_interruptible(&mousedev->wait); | |
320 | } | |
321 | ||
322 | static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) | |
323 | { | |
324 | if (!value) { | |
325 | if (mousedev->touch && | |
326 | time_before(jiffies, | |
327 | mousedev->touch + msecs_to_jiffies(tap_time))) { | |
328 | /* | |
329 | * Toggle left button to emulate tap. | |
330 | * We rely on the fact that mousedev_mix always has 0 | |
331 | * motion packet so we won't mess current position. | |
332 | */ | |
333 | set_bit(0, &mousedev->packet.buttons); | |
334 | set_bit(0, &mousedev_mix->packet.buttons); | |
335 | mousedev_notify_readers(mousedev, &mousedev_mix->packet); | |
336 | mousedev_notify_readers(mousedev_mix, | |
337 | &mousedev_mix->packet); | |
338 | clear_bit(0, &mousedev->packet.buttons); | |
339 | clear_bit(0, &mousedev_mix->packet.buttons); | |
340 | } | |
341 | mousedev->touch = mousedev->pkt_count = 0; | |
342 | mousedev->frac_dx = 0; | |
343 | mousedev->frac_dy = 0; | |
344 | ||
345 | } else if (!mousedev->touch) | |
346 | mousedev->touch = jiffies; | |
347 | } | |
348 | ||
349 | static void mousedev_event(struct input_handle *handle, | |
350 | unsigned int type, unsigned int code, int value) | |
351 | { | |
352 | struct mousedev *mousedev = handle->private; | |
353 | ||
354 | switch (type) { | |
355 | ||
356 | case EV_ABS: | |
357 | /* Ignore joysticks */ | |
358 | if (test_bit(BTN_TRIGGER, handle->dev->keybit)) | |
359 | return; | |
360 | ||
361 | if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) | |
362 | mousedev_touchpad_event(handle->dev, | |
363 | mousedev, code, value); | |
364 | else | |
365 | mousedev_abs_event(handle->dev, mousedev, code, value); | |
366 | ||
367 | break; | |
368 | ||
369 | case EV_REL: | |
370 | mousedev_rel_event(mousedev, code, value); | |
371 | break; | |
372 | ||
373 | case EV_KEY: | |
374 | if (value != 2) { | |
375 | if (code == BTN_TOUCH && | |
376 | test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) | |
377 | mousedev_touchpad_touch(mousedev, value); | |
378 | else | |
379 | mousedev_key_event(mousedev, code, value); | |
380 | } | |
381 | break; | |
382 | ||
383 | case EV_SYN: | |
384 | if (code == SYN_REPORT) { | |
385 | if (mousedev->touch) { | |
386 | mousedev->pkt_count++; | |
387 | /* | |
388 | * Input system eats duplicate events, | |
389 | * but we need all of them to do correct | |
390 | * averaging so apply present one forward | |
391 | */ | |
392 | fx(0) = fx(1); | |
393 | fy(0) = fy(1); | |
394 | } | |
395 | ||
396 | mousedev_notify_readers(mousedev, &mousedev->packet); | |
397 | mousedev_notify_readers(mousedev_mix, &mousedev->packet); | |
398 | ||
399 | mousedev->packet.dx = mousedev->packet.dy = | |
400 | mousedev->packet.dz = 0; | |
401 | mousedev->packet.abs_event = 0; | |
402 | } | |
403 | break; | |
404 | } | |
405 | } | |
406 | ||
407 | static int mousedev_fasync(int fd, struct file *file, int on) | |
408 | { | |
409 | struct mousedev_client *client = file->private_data; | |
410 | ||
411 | return fasync_helper(fd, file, on, &client->fasync); | |
412 | } | |
413 | ||
414 | static void mousedev_free(struct device *dev) | |
415 | { | |
416 | struct mousedev *mousedev = container_of(dev, struct mousedev, dev); | |
417 | ||
418 | input_put_device(mousedev->handle.dev); | |
419 | kfree(mousedev); | |
420 | } | |
421 | ||
422 | static int mousedev_open_device(struct mousedev *mousedev) | |
423 | { | |
424 | int retval; | |
425 | ||
426 | retval = mutex_lock_interruptible(&mousedev->mutex); | |
427 | if (retval) | |
428 | return retval; | |
429 | ||
430 | if (!mousedev->exist) | |
431 | retval = -ENODEV; | |
432 | else if (!mousedev->open++) { | |
433 | retval = input_open_device(&mousedev->handle); | |
434 | if (retval) | |
435 | mousedev->open--; | |
436 | } | |
437 | ||
438 | mutex_unlock(&mousedev->mutex); | |
439 | return retval; | |
440 | } | |
441 | ||
442 | static void mousedev_close_device(struct mousedev *mousedev) | |
443 | { | |
444 | mutex_lock(&mousedev->mutex); | |
445 | ||
446 | if (mousedev->exist && !--mousedev->open) | |
447 | input_close_device(&mousedev->handle); | |
448 | ||
449 | mutex_unlock(&mousedev->mutex); | |
450 | } | |
451 | ||
452 | /* | |
453 | * Open all available devices so they can all be multiplexed in one. | |
454 | * stream. Note that this function is called with mousedev_mix->mutex | |
455 | * held. | |
456 | */ | |
457 | static int mixdev_open_devices(struct mousedev *mixdev) | |
458 | { | |
459 | int error; | |
460 | ||
461 | error = mutex_lock_interruptible(&mixdev->mutex); | |
462 | if (error) | |
463 | return error; | |
464 | ||
465 | if (!mixdev->open++) { | |
466 | struct mousedev *mousedev; | |
467 | ||
468 | list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { | |
469 | if (!mousedev->opened_by_mixdev) { | |
470 | if (mousedev_open_device(mousedev)) | |
471 | continue; | |
472 | ||
473 | mousedev->opened_by_mixdev = true; | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
478 | mutex_unlock(&mixdev->mutex); | |
479 | return 0; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Close all devices that were opened as part of multiplexed | |
484 | * device. Note that this function is called with mousedev_mix->mutex | |
485 | * held. | |
486 | */ | |
487 | static void mixdev_close_devices(struct mousedev *mixdev) | |
488 | { | |
489 | mutex_lock(&mixdev->mutex); | |
490 | ||
491 | if (!--mixdev->open) { | |
492 | struct mousedev *mousedev; | |
493 | ||
494 | list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { | |
495 | if (mousedev->opened_by_mixdev) { | |
496 | mousedev->opened_by_mixdev = false; | |
497 | mousedev_close_device(mousedev); | |
498 | } | |
499 | } | |
500 | } | |
501 | ||
502 | mutex_unlock(&mixdev->mutex); | |
503 | } | |
504 | ||
505 | ||
506 | static void mousedev_attach_client(struct mousedev *mousedev, | |
507 | struct mousedev_client *client) | |
508 | { | |
509 | spin_lock(&mousedev->client_lock); | |
510 | list_add_tail_rcu(&client->node, &mousedev->client_list); | |
511 | spin_unlock(&mousedev->client_lock); | |
512 | } | |
513 | ||
514 | static void mousedev_detach_client(struct mousedev *mousedev, | |
515 | struct mousedev_client *client) | |
516 | { | |
517 | spin_lock(&mousedev->client_lock); | |
518 | list_del_rcu(&client->node); | |
519 | spin_unlock(&mousedev->client_lock); | |
520 | synchronize_rcu(); | |
521 | } | |
522 | ||
523 | static int mousedev_release(struct inode *inode, struct file *file) | |
524 | { | |
525 | struct mousedev_client *client = file->private_data; | |
526 | struct mousedev *mousedev = client->mousedev; | |
527 | ||
528 | mousedev_detach_client(mousedev, client); | |
529 | kfree(client); | |
530 | ||
531 | mousedev->close_device(mousedev); | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int mousedev_open(struct inode *inode, struct file *file) | |
537 | { | |
538 | struct mousedev_client *client; | |
539 | struct mousedev *mousedev; | |
540 | int error; | |
541 | ||
542 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX | |
543 | if (imajor(inode) == MISC_MAJOR) | |
544 | mousedev = mousedev_mix; | |
545 | else | |
546 | #endif | |
547 | mousedev = container_of(inode->i_cdev, struct mousedev, cdev); | |
548 | ||
549 | client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); | |
550 | if (!client) | |
551 | return -ENOMEM; | |
552 | ||
553 | spin_lock_init(&client->packet_lock); | |
554 | client->pos_x = xres / 2; | |
555 | client->pos_y = yres / 2; | |
556 | client->mousedev = mousedev; | |
557 | mousedev_attach_client(mousedev, client); | |
558 | ||
559 | error = mousedev->open_device(mousedev); | |
560 | if (error) | |
561 | goto err_free_client; | |
562 | ||
563 | file->private_data = client; | |
564 | nonseekable_open(inode, file); | |
565 | ||
566 | return 0; | |
567 | ||
568 | err_free_client: | |
569 | mousedev_detach_client(mousedev, client); | |
570 | kfree(client); | |
571 | return error; | |
572 | } | |
573 | ||
574 | static inline int mousedev_limit_delta(int delta, int limit) | |
575 | { | |
576 | return delta > limit ? limit : (delta < -limit ? -limit : delta); | |
577 | } | |
578 | ||
579 | static void mousedev_packet(struct mousedev_client *client, | |
580 | signed char *ps2_data) | |
581 | { | |
582 | struct mousedev_motion *p = &client->packets[client->tail]; | |
583 | ||
584 | ps2_data[0] = 0x08 | | |
585 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); | |
586 | ps2_data[1] = mousedev_limit_delta(p->dx, 127); | |
587 | ps2_data[2] = mousedev_limit_delta(p->dy, 127); | |
588 | p->dx -= ps2_data[1]; | |
589 | p->dy -= ps2_data[2]; | |
590 | ||
591 | switch (client->mode) { | |
592 | case MOUSEDEV_EMUL_EXPS: | |
593 | ps2_data[3] = mousedev_limit_delta(p->dz, 7); | |
594 | p->dz -= ps2_data[3]; | |
595 | ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); | |
596 | client->bufsiz = 4; | |
597 | break; | |
598 | ||
599 | case MOUSEDEV_EMUL_IMPS: | |
600 | ps2_data[0] |= | |
601 | ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); | |
602 | ps2_data[3] = mousedev_limit_delta(p->dz, 127); | |
603 | p->dz -= ps2_data[3]; | |
604 | client->bufsiz = 4; | |
605 | break; | |
606 | ||
607 | case MOUSEDEV_EMUL_PS2: | |
608 | default: | |
609 | ps2_data[0] |= | |
610 | ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); | |
611 | p->dz = 0; | |
612 | client->bufsiz = 3; | |
613 | break; | |
614 | } | |
615 | ||
616 | if (!p->dx && !p->dy && !p->dz) { | |
617 | if (client->tail == client->head) { | |
618 | client->ready = 0; | |
619 | client->last_buttons = p->buttons; | |
620 | } else | |
621 | client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; | |
622 | } | |
623 | } | |
624 | ||
625 | static void mousedev_generate_response(struct mousedev_client *client, | |
626 | int command) | |
627 | { | |
628 | client->ps2[0] = 0xfa; /* ACK */ | |
629 | ||
630 | switch (command) { | |
631 | ||
632 | case 0xeb: /* Poll */ | |
633 | mousedev_packet(client, &client->ps2[1]); | |
634 | client->bufsiz++; /* account for leading ACK */ | |
635 | break; | |
636 | ||
637 | case 0xf2: /* Get ID */ | |
638 | switch (client->mode) { | |
639 | case MOUSEDEV_EMUL_PS2: | |
640 | client->ps2[1] = 0; | |
641 | break; | |
642 | case MOUSEDEV_EMUL_IMPS: | |
643 | client->ps2[1] = 3; | |
644 | break; | |
645 | case MOUSEDEV_EMUL_EXPS: | |
646 | client->ps2[1] = 4; | |
647 | break; | |
648 | } | |
649 | client->bufsiz = 2; | |
650 | break; | |
651 | ||
652 | case 0xe9: /* Get info */ | |
653 | client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; | |
654 | client->bufsiz = 4; | |
655 | break; | |
656 | ||
657 | case 0xff: /* Reset */ | |
658 | client->impsseq = client->imexseq = 0; | |
659 | client->mode = MOUSEDEV_EMUL_PS2; | |
660 | client->ps2[1] = 0xaa; client->ps2[2] = 0x00; | |
661 | client->bufsiz = 3; | |
662 | break; | |
663 | ||
664 | default: | |
665 | client->bufsiz = 1; | |
666 | break; | |
667 | } | |
668 | client->buffer = client->bufsiz; | |
669 | } | |
670 | ||
671 | static ssize_t mousedev_write(struct file *file, const char __user *buffer, | |
672 | size_t count, loff_t *ppos) | |
673 | { | |
674 | struct mousedev_client *client = file->private_data; | |
675 | unsigned char c; | |
676 | unsigned int i; | |
677 | ||
678 | for (i = 0; i < count; i++) { | |
679 | ||
680 | if (get_user(c, buffer + i)) | |
681 | return -EFAULT; | |
682 | ||
683 | spin_lock_irq(&client->packet_lock); | |
684 | ||
685 | if (c == mousedev_imex_seq[client->imexseq]) { | |
686 | if (++client->imexseq == MOUSEDEV_SEQ_LEN) { | |
687 | client->imexseq = 0; | |
688 | client->mode = MOUSEDEV_EMUL_EXPS; | |
689 | } | |
690 | } else | |
691 | client->imexseq = 0; | |
692 | ||
693 | if (c == mousedev_imps_seq[client->impsseq]) { | |
694 | if (++client->impsseq == MOUSEDEV_SEQ_LEN) { | |
695 | client->impsseq = 0; | |
696 | client->mode = MOUSEDEV_EMUL_IMPS; | |
697 | } | |
698 | } else | |
699 | client->impsseq = 0; | |
700 | ||
701 | mousedev_generate_response(client, c); | |
702 | ||
703 | spin_unlock_irq(&client->packet_lock); | |
704 | } | |
705 | ||
706 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
707 | wake_up_interruptible(&client->mousedev->wait); | |
708 | ||
709 | return count; | |
710 | } | |
711 | ||
712 | static ssize_t mousedev_read(struct file *file, char __user *buffer, | |
713 | size_t count, loff_t *ppos) | |
714 | { | |
715 | struct mousedev_client *client = file->private_data; | |
716 | struct mousedev *mousedev = client->mousedev; | |
717 | signed char data[sizeof(client->ps2)]; | |
718 | int retval = 0; | |
719 | ||
720 | if (!client->ready && !client->buffer && mousedev->exist && | |
721 | (file->f_flags & O_NONBLOCK)) | |
722 | return -EAGAIN; | |
723 | ||
724 | retval = wait_event_interruptible(mousedev->wait, | |
725 | !mousedev->exist || client->ready || client->buffer); | |
726 | if (retval) | |
727 | return retval; | |
728 | ||
729 | if (!mousedev->exist) | |
730 | return -ENODEV; | |
731 | ||
732 | spin_lock_irq(&client->packet_lock); | |
733 | ||
734 | if (!client->buffer && client->ready) { | |
735 | mousedev_packet(client, client->ps2); | |
736 | client->buffer = client->bufsiz; | |
737 | } | |
738 | ||
739 | if (count > client->buffer) | |
740 | count = client->buffer; | |
741 | ||
742 | memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); | |
743 | client->buffer -= count; | |
744 | ||
745 | spin_unlock_irq(&client->packet_lock); | |
746 | ||
747 | if (copy_to_user(buffer, data, count)) | |
748 | return -EFAULT; | |
749 | ||
750 | return count; | |
751 | } | |
752 | ||
753 | /* No kernel lock - fine */ | |
754 | static unsigned int mousedev_poll(struct file *file, poll_table *wait) | |
755 | { | |
756 | struct mousedev_client *client = file->private_data; | |
757 | struct mousedev *mousedev = client->mousedev; | |
758 | unsigned int mask; | |
759 | ||
760 | poll_wait(file, &mousedev->wait, wait); | |
761 | ||
762 | mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
763 | if (client->ready || client->buffer) | |
764 | mask |= POLLIN | POLLRDNORM; | |
765 | ||
766 | return mask; | |
767 | } | |
768 | ||
769 | static const struct file_operations mousedev_fops = { | |
770 | .owner = THIS_MODULE, | |
771 | .read = mousedev_read, | |
772 | .write = mousedev_write, | |
773 | .poll = mousedev_poll, | |
774 | .open = mousedev_open, | |
775 | .release = mousedev_release, | |
776 | .fasync = mousedev_fasync, | |
777 | .llseek = noop_llseek, | |
778 | }; | |
779 | ||
780 | /* | |
781 | * Mark device non-existent. This disables writes, ioctls and | |
782 | * prevents new users from opening the device. Already posted | |
783 | * blocking reads will stay, however new ones will fail. | |
784 | */ | |
785 | static void mousedev_mark_dead(struct mousedev *mousedev) | |
786 | { | |
787 | mutex_lock(&mousedev->mutex); | |
788 | mousedev->exist = false; | |
789 | mutex_unlock(&mousedev->mutex); | |
790 | } | |
791 | ||
792 | /* | |
793 | * Wake up users waiting for IO so they can disconnect from | |
794 | * dead device. | |
795 | */ | |
796 | static void mousedev_hangup(struct mousedev *mousedev) | |
797 | { | |
798 | struct mousedev_client *client; | |
799 | ||
800 | spin_lock(&mousedev->client_lock); | |
801 | list_for_each_entry(client, &mousedev->client_list, node) | |
802 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
803 | spin_unlock(&mousedev->client_lock); | |
804 | ||
805 | wake_up_interruptible(&mousedev->wait); | |
806 | } | |
807 | ||
808 | static void mousedev_cleanup(struct mousedev *mousedev) | |
809 | { | |
810 | struct input_handle *handle = &mousedev->handle; | |
811 | ||
812 | mousedev_mark_dead(mousedev); | |
813 | mousedev_hangup(mousedev); | |
814 | ||
815 | cdev_del(&mousedev->cdev); | |
816 | ||
817 | /* mousedev is marked dead so no one else accesses mousedev->open */ | |
818 | if (mousedev->open) | |
819 | input_close_device(handle); | |
820 | } | |
821 | ||
822 | static int mousedev_reserve_minor(bool mixdev) | |
823 | { | |
824 | int minor; | |
825 | ||
826 | if (mixdev) { | |
827 | minor = input_get_new_minor(MOUSEDEV_MIX, 1, false); | |
828 | if (minor < 0) | |
829 | pr_err("failed to reserve mixdev minor: %d\n", minor); | |
830 | } else { | |
831 | minor = input_get_new_minor(MOUSEDEV_MINOR_BASE, | |
832 | MOUSEDEV_MINORS, true); | |
833 | if (minor < 0) | |
834 | pr_err("failed to reserve new minor: %d\n", minor); | |
835 | } | |
836 | ||
837 | return minor; | |
838 | } | |
839 | ||
840 | static struct mousedev *mousedev_create(struct input_dev *dev, | |
841 | struct input_handler *handler, | |
842 | bool mixdev) | |
843 | { | |
844 | struct mousedev *mousedev; | |
845 | int minor; | |
846 | int error; | |
847 | ||
848 | minor = mousedev_reserve_minor(mixdev); | |
849 | if (minor < 0) { | |
850 | error = minor; | |
851 | goto err_out; | |
852 | } | |
853 | ||
854 | mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); | |
855 | if (!mousedev) { | |
856 | error = -ENOMEM; | |
857 | goto err_free_minor; | |
858 | } | |
859 | ||
860 | INIT_LIST_HEAD(&mousedev->client_list); | |
861 | INIT_LIST_HEAD(&mousedev->mixdev_node); | |
862 | spin_lock_init(&mousedev->client_lock); | |
863 | mutex_init(&mousedev->mutex); | |
864 | lockdep_set_subclass(&mousedev->mutex, | |
865 | mixdev ? SINGLE_DEPTH_NESTING : 0); | |
866 | init_waitqueue_head(&mousedev->wait); | |
867 | ||
868 | if (mixdev) { | |
869 | dev_set_name(&mousedev->dev, "mice"); | |
870 | ||
871 | mousedev->open_device = mixdev_open_devices; | |
872 | mousedev->close_device = mixdev_close_devices; | |
873 | } else { | |
874 | int dev_no = minor; | |
875 | /* Normalize device number if it falls into legacy range */ | |
876 | if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS) | |
877 | dev_no -= MOUSEDEV_MINOR_BASE; | |
878 | dev_set_name(&mousedev->dev, "mouse%d", dev_no); | |
879 | ||
880 | mousedev->open_device = mousedev_open_device; | |
881 | mousedev->close_device = mousedev_close_device; | |
882 | } | |
883 | ||
884 | mousedev->exist = true; | |
885 | mousedev->handle.dev = input_get_device(dev); | |
886 | mousedev->handle.name = dev_name(&mousedev->dev); | |
887 | mousedev->handle.handler = handler; | |
888 | mousedev->handle.private = mousedev; | |
889 | ||
890 | mousedev->dev.class = &input_class; | |
891 | if (dev) | |
892 | mousedev->dev.parent = &dev->dev; | |
893 | mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor); | |
894 | mousedev->dev.release = mousedev_free; | |
895 | device_initialize(&mousedev->dev); | |
896 | ||
897 | if (!mixdev) { | |
898 | error = input_register_handle(&mousedev->handle); | |
899 | if (error) | |
900 | goto err_free_mousedev; | |
901 | } | |
902 | ||
903 | cdev_init(&mousedev->cdev, &mousedev_fops); | |
904 | mousedev->cdev.kobj.parent = &mousedev->dev.kobj; | |
905 | error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1); | |
906 | if (error) | |
907 | goto err_unregister_handle; | |
908 | ||
909 | error = device_add(&mousedev->dev); | |
910 | if (error) | |
911 | goto err_cleanup_mousedev; | |
912 | ||
913 | return mousedev; | |
914 | ||
915 | err_cleanup_mousedev: | |
916 | mousedev_cleanup(mousedev); | |
917 | err_unregister_handle: | |
918 | if (!mixdev) | |
919 | input_unregister_handle(&mousedev->handle); | |
920 | err_free_mousedev: | |
921 | put_device(&mousedev->dev); | |
922 | err_free_minor: | |
923 | input_free_minor(minor); | |
924 | err_out: | |
925 | return ERR_PTR(error); | |
926 | } | |
927 | ||
928 | static void mousedev_destroy(struct mousedev *mousedev) | |
929 | { | |
930 | device_del(&mousedev->dev); | |
931 | mousedev_cleanup(mousedev); | |
932 | input_free_minor(MINOR(mousedev->dev.devt)); | |
933 | if (mousedev != mousedev_mix) | |
934 | input_unregister_handle(&mousedev->handle); | |
935 | put_device(&mousedev->dev); | |
936 | } | |
937 | ||
938 | static int mixdev_add_device(struct mousedev *mousedev) | |
939 | { | |
940 | int retval; | |
941 | ||
942 | retval = mutex_lock_interruptible(&mousedev_mix->mutex); | |
943 | if (retval) | |
944 | return retval; | |
945 | ||
946 | if (mousedev_mix->open) { | |
947 | retval = mousedev_open_device(mousedev); | |
948 | if (retval) | |
949 | goto out; | |
950 | ||
951 | mousedev->opened_by_mixdev = true; | |
952 | } | |
953 | ||
954 | get_device(&mousedev->dev); | |
955 | list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); | |
956 | ||
957 | out: | |
958 | mutex_unlock(&mousedev_mix->mutex); | |
959 | return retval; | |
960 | } | |
961 | ||
962 | static void mixdev_remove_device(struct mousedev *mousedev) | |
963 | { | |
964 | mutex_lock(&mousedev_mix->mutex); | |
965 | ||
966 | if (mousedev->opened_by_mixdev) { | |
967 | mousedev->opened_by_mixdev = false; | |
968 | mousedev_close_device(mousedev); | |
969 | } | |
970 | ||
971 | list_del_init(&mousedev->mixdev_node); | |
972 | mutex_unlock(&mousedev_mix->mutex); | |
973 | ||
974 | put_device(&mousedev->dev); | |
975 | } | |
976 | ||
977 | static int mousedev_connect(struct input_handler *handler, | |
978 | struct input_dev *dev, | |
979 | const struct input_device_id *id) | |
980 | { | |
981 | struct mousedev *mousedev; | |
982 | int error; | |
983 | ||
984 | mousedev = mousedev_create(dev, handler, false); | |
985 | if (IS_ERR(mousedev)) | |
986 | return PTR_ERR(mousedev); | |
987 | ||
988 | error = mixdev_add_device(mousedev); | |
989 | if (error) { | |
990 | mousedev_destroy(mousedev); | |
991 | return error; | |
992 | } | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
997 | static void mousedev_disconnect(struct input_handle *handle) | |
998 | { | |
999 | struct mousedev *mousedev = handle->private; | |
1000 | ||
1001 | mixdev_remove_device(mousedev); | |
1002 | mousedev_destroy(mousedev); | |
1003 | } | |
1004 | ||
1005 | static const struct input_device_id mousedev_ids[] = { | |
1006 | { | |
1007 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
1008 | INPUT_DEVICE_ID_MATCH_KEYBIT | | |
1009 | INPUT_DEVICE_ID_MATCH_RELBIT, | |
1010 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, | |
1011 | .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, | |
1012 | .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, | |
1013 | }, /* A mouse like device, at least one button, | |
1014 | two relative axes */ | |
1015 | { | |
1016 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
1017 | INPUT_DEVICE_ID_MATCH_RELBIT, | |
1018 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, | |
1019 | .relbit = { BIT_MASK(REL_WHEEL) }, | |
1020 | }, /* A separate scrollwheel */ | |
1021 | { | |
1022 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
1023 | INPUT_DEVICE_ID_MATCH_KEYBIT | | |
1024 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
1025 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, | |
1026 | .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, | |
1027 | .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, | |
1028 | }, /* A tablet like device, at least touch detection, | |
1029 | two absolute axes */ | |
1030 | { | |
1031 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
1032 | INPUT_DEVICE_ID_MATCH_KEYBIT | | |
1033 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
1034 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, | |
1035 | .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = | |
1036 | BIT_MASK(BTN_TOOL_FINGER) }, | |
1037 | .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | | |
1038 | BIT_MASK(ABS_PRESSURE) | | |
1039 | BIT_MASK(ABS_TOOL_WIDTH) }, | |
1040 | }, /* A touchpad */ | |
1041 | { | |
1042 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
1043 | INPUT_DEVICE_ID_MATCH_KEYBIT | | |
1044 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
1045 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, | |
1046 | .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, | |
1047 | .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, | |
1048 | }, /* Mouse-like device with absolute X and Y but ordinary | |
1049 | clicks, like hp ILO2 High Performance mouse */ | |
1050 | ||
1051 | { }, /* Terminating entry */ | |
1052 | }; | |
1053 | ||
1054 | MODULE_DEVICE_TABLE(input, mousedev_ids); | |
1055 | ||
1056 | static struct input_handler mousedev_handler = { | |
1057 | .event = mousedev_event, | |
1058 | .connect = mousedev_connect, | |
1059 | .disconnect = mousedev_disconnect, | |
1060 | .legacy_minors = true, | |
1061 | .minor = MOUSEDEV_MINOR_BASE, | |
1062 | .name = "mousedev", | |
1063 | .id_table = mousedev_ids, | |
1064 | }; | |
1065 | ||
1066 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX | |
1067 | #include <linux/miscdevice.h> | |
1068 | ||
1069 | static struct miscdevice psaux_mouse = { | |
1070 | .minor = PSMOUSE_MINOR, | |
1071 | .name = "psaux", | |
1072 | .fops = &mousedev_fops, | |
1073 | }; | |
1074 | ||
1075 | static bool psaux_registered; | |
1076 | ||
1077 | static void __init mousedev_psaux_register(void) | |
1078 | { | |
1079 | int error; | |
1080 | ||
1081 | error = misc_register(&psaux_mouse); | |
1082 | if (error) | |
1083 | pr_warn("could not register psaux device, error: %d\n", | |
1084 | error); | |
1085 | else | |
1086 | psaux_registered = true; | |
1087 | } | |
1088 | ||
1089 | static void __exit mousedev_psaux_unregister(void) | |
1090 | { | |
1091 | if (psaux_registered) | |
1092 | misc_deregister(&psaux_mouse); | |
1093 | } | |
1094 | #else | |
1095 | static inline void mousedev_psaux_register(void) { } | |
1096 | static inline void mousedev_psaux_unregister(void) { } | |
1097 | #endif | |
1098 | ||
1099 | static int __init mousedev_init(void) | |
1100 | { | |
1101 | int error; | |
1102 | ||
1103 | mousedev_mix = mousedev_create(NULL, &mousedev_handler, true); | |
1104 | if (IS_ERR(mousedev_mix)) | |
1105 | return PTR_ERR(mousedev_mix); | |
1106 | ||
1107 | error = input_register_handler(&mousedev_handler); | |
1108 | if (error) { | |
1109 | mousedev_destroy(mousedev_mix); | |
1110 | return error; | |
1111 | } | |
1112 | ||
1113 | mousedev_psaux_register(); | |
1114 | ||
1115 | pr_info("PS/2 mouse device common for all mice\n"); | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static void __exit mousedev_exit(void) | |
1121 | { | |
1122 | mousedev_psaux_unregister(); | |
1123 | input_unregister_handler(&mousedev_handler); | |
1124 | mousedev_destroy(mousedev_mix); | |
1125 | } | |
1126 | ||
1127 | module_init(mousedev_init); | |
1128 | module_exit(mousedev_exit); |