1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Input driver to ExplorerPS/2 device driver module. |
4 | * |
5 | * Copyright (c) 1999-2002 Vojtech Pavlik |
6 | * Copyright (c) 2004 Dmitry Torokhov |
7 | */ |
8 | |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | |
11 | #define MOUSEDEV_MINOR_BASE 32 |
12 | #define MOUSEDEV_MINORS 31 |
13 | #define MOUSEDEV_MIX 63 |
14 | |
15 | #include <linux/bitops.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/poll.h> |
19 | #include <linux/module.h> |
20 | #include <linux/init.h> |
21 | #include <linux/input.h> |
22 | #include <linux/random.h> |
23 | #include <linux/major.h> |
24 | #include <linux/device.h> |
25 | #include <linux/cdev.h> |
26 | #include <linux/kernel.h> |
27 | |
28 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>" ); |
29 | MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces" ); |
30 | MODULE_LICENSE("GPL" ); |
31 | |
32 | #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X |
33 | #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 |
34 | #endif |
35 | #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y |
36 | #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 |
37 | #endif |
38 | |
39 | static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; |
40 | module_param(xres, uint, 0644); |
41 | MODULE_PARM_DESC(xres, "Horizontal screen resolution" ); |
42 | |
43 | static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; |
44 | module_param(yres, uint, 0644); |
45 | MODULE_PARM_DESC(yres, "Vertical screen resolution" ); |
46 | |
47 | static unsigned tap_time = 200; |
48 | module_param(tap_time, uint, 0644); |
49 | MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)" ); |
50 | |
51 | struct mousedev_hw_data { |
52 | int dx, dy, dz; |
53 | int x, y; |
54 | int abs_event; |
55 | unsigned long buttons; |
56 | }; |
57 | |
58 | struct mousedev { |
59 | int open; |
60 | struct input_handle handle; |
61 | wait_queue_head_t wait; |
62 | struct list_head client_list; |
63 | spinlock_t client_lock; /* protects client_list */ |
64 | struct mutex mutex; |
65 | struct device dev; |
66 | struct cdev cdev; |
67 | bool exist; |
68 | |
69 | struct list_head mixdev_node; |
70 | bool opened_by_mixdev; |
71 | |
72 | struct mousedev_hw_data packet; |
73 | unsigned int pkt_count; |
74 | int old_x[4], old_y[4]; |
75 | int frac_dx, frac_dy; |
76 | unsigned long touch; |
77 | |
78 | int (*open_device)(struct mousedev *mousedev); |
79 | void (*close_device)(struct mousedev *mousedev); |
80 | }; |
81 | |
82 | enum mousedev_emul { |
83 | MOUSEDEV_EMUL_PS2, |
84 | MOUSEDEV_EMUL_IMPS, |
85 | MOUSEDEV_EMUL_EXPS |
86 | }; |
87 | |
88 | struct mousedev_motion { |
89 | int dx, dy, dz; |
90 | unsigned long buttons; |
91 | }; |
92 | |
93 | #define PACKET_QUEUE_LEN 16 |
94 | struct mousedev_client { |
95 | struct fasync_struct *fasync; |
96 | struct mousedev *mousedev; |
97 | struct list_head node; |
98 | |
99 | struct mousedev_motion packets[PACKET_QUEUE_LEN]; |
100 | unsigned int head, tail; |
101 | spinlock_t packet_lock; |
102 | int pos_x, pos_y; |
103 | |
104 | u8 ps2[6]; |
105 | unsigned char ready, buffer, bufsiz; |
106 | unsigned char imexseq, impsseq; |
107 | enum mousedev_emul mode; |
108 | unsigned long last_buttons; |
109 | }; |
110 | |
111 | #define MOUSEDEV_SEQ_LEN 6 |
112 | |
113 | static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; |
114 | static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; |
115 | |
116 | static struct mousedev *mousedev_mix; |
117 | static LIST_HEAD(mousedev_mix_list); |
118 | |
119 | #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) |
120 | #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) |
121 | |
122 | static void mousedev_touchpad_event(struct input_dev *dev, |
123 | struct mousedev *mousedev, |
124 | unsigned int code, int value) |
125 | { |
126 | int size, tmp; |
127 | enum { FRACTION_DENOM = 128 }; |
128 | |
129 | switch (code) { |
130 | |
131 | case ABS_X: |
132 | |
133 | fx(0) = value; |
134 | if (mousedev->touch && mousedev->pkt_count >= 2) { |
135 | size = input_abs_get_max(dev, ABS_X) - |
136 | input_abs_get_min(dev, ABS_X); |
137 | if (size == 0) |
138 | size = 256 * 2; |
139 | |
140 | tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; |
141 | tmp += mousedev->frac_dx; |
142 | mousedev->packet.dx = tmp / FRACTION_DENOM; |
143 | mousedev->frac_dx = |
144 | tmp - mousedev->packet.dx * FRACTION_DENOM; |
145 | } |
146 | break; |
147 | |
148 | case ABS_Y: |
149 | fy(0) = value; |
150 | if (mousedev->touch && mousedev->pkt_count >= 2) { |
151 | /* use X size for ABS_Y to keep the same scale */ |
152 | size = input_abs_get_max(dev, ABS_X) - |
153 | input_abs_get_min(dev, ABS_X); |
154 | if (size == 0) |
155 | size = 256 * 2; |
156 | |
157 | tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; |
158 | tmp += mousedev->frac_dy; |
159 | mousedev->packet.dy = tmp / FRACTION_DENOM; |
160 | mousedev->frac_dy = tmp - |
161 | mousedev->packet.dy * FRACTION_DENOM; |
162 | } |
163 | break; |
164 | } |
165 | } |
166 | |
167 | static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, |
168 | unsigned int code, int value) |
169 | { |
170 | int min, max, size; |
171 | |
172 | switch (code) { |
173 | |
174 | case ABS_X: |
175 | min = input_abs_get_min(dev, ABS_X); |
176 | max = input_abs_get_max(dev, ABS_X); |
177 | |
178 | size = max - min; |
179 | if (size == 0) |
180 | size = xres ? : 1; |
181 | |
182 | value = clamp(value, min, max); |
183 | |
184 | mousedev->packet.x = ((value - min) * xres) / size; |
185 | mousedev->packet.abs_event = 1; |
186 | break; |
187 | |
188 | case ABS_Y: |
189 | min = input_abs_get_min(dev, ABS_Y); |
190 | max = input_abs_get_max(dev, ABS_Y); |
191 | |
192 | size = max - min; |
193 | if (size == 0) |
194 | size = yres ? : 1; |
195 | |
196 | value = clamp(value, min, max); |
197 | |
198 | mousedev->packet.y = yres - ((value - min) * yres) / size; |
199 | mousedev->packet.abs_event = 1; |
200 | break; |
201 | } |
202 | } |
203 | |
204 | static void mousedev_rel_event(struct mousedev *mousedev, |
205 | unsigned int code, int value) |
206 | { |
207 | switch (code) { |
208 | case REL_X: |
209 | mousedev->packet.dx += value; |
210 | break; |
211 | |
212 | case REL_Y: |
213 | mousedev->packet.dy -= value; |
214 | break; |
215 | |
216 | case REL_WHEEL: |
217 | mousedev->packet.dz -= value; |
218 | break; |
219 | } |
220 | } |
221 | |
222 | static void mousedev_key_event(struct mousedev *mousedev, |
223 | unsigned int code, int value) |
224 | { |
225 | int index; |
226 | |
227 | switch (code) { |
228 | |
229 | case BTN_TOUCH: |
230 | case BTN_0: |
231 | case BTN_LEFT: index = 0; break; |
232 | |
233 | case BTN_STYLUS: |
234 | case BTN_1: |
235 | case BTN_RIGHT: index = 1; break; |
236 | |
237 | case BTN_2: |
238 | case BTN_FORWARD: |
239 | case BTN_STYLUS2: |
240 | case BTN_MIDDLE: index = 2; break; |
241 | |
242 | case BTN_3: |
243 | case BTN_BACK: |
244 | case BTN_SIDE: index = 3; break; |
245 | |
246 | case BTN_4: |
247 | case BTN_EXTRA: index = 4; break; |
248 | |
249 | default: return; |
250 | } |
251 | |
252 | if (value) { |
253 | set_bit(nr: index, addr: &mousedev->packet.buttons); |
254 | set_bit(nr: index, addr: &mousedev_mix->packet.buttons); |
255 | } else { |
256 | clear_bit(nr: index, addr: &mousedev->packet.buttons); |
257 | clear_bit(nr: index, addr: &mousedev_mix->packet.buttons); |
258 | } |
259 | } |
260 | |
261 | static void mousedev_notify_readers(struct mousedev *mousedev, |
262 | struct mousedev_hw_data *packet) |
263 | { |
264 | struct mousedev_client *client; |
265 | struct mousedev_motion *p; |
266 | unsigned int new_head; |
267 | int wake_readers = 0; |
268 | |
269 | rcu_read_lock(); |
270 | list_for_each_entry_rcu(client, &mousedev->client_list, node) { |
271 | |
272 | /* Just acquire the lock, interrupts already disabled */ |
273 | spin_lock(lock: &client->packet_lock); |
274 | |
275 | p = &client->packets[client->head]; |
276 | if (client->ready && p->buttons != mousedev->packet.buttons) { |
277 | new_head = (client->head + 1) % PACKET_QUEUE_LEN; |
278 | if (new_head != client->tail) { |
279 | p = &client->packets[client->head = new_head]; |
280 | memset(p, 0, sizeof(struct mousedev_motion)); |
281 | } |
282 | } |
283 | |
284 | if (packet->abs_event) { |
285 | p->dx += packet->x - client->pos_x; |
286 | p->dy += packet->y - client->pos_y; |
287 | client->pos_x = packet->x; |
288 | client->pos_y = packet->y; |
289 | } |
290 | |
291 | client->pos_x += packet->dx; |
292 | client->pos_x = clamp_val(client->pos_x, 0, xres); |
293 | |
294 | client->pos_y += packet->dy; |
295 | client->pos_y = clamp_val(client->pos_y, 0, yres); |
296 | |
297 | p->dx += packet->dx; |
298 | p->dy += packet->dy; |
299 | p->dz += packet->dz; |
300 | p->buttons = mousedev->packet.buttons; |
301 | |
302 | if (p->dx || p->dy || p->dz || |
303 | p->buttons != client->last_buttons) |
304 | client->ready = 1; |
305 | |
306 | spin_unlock(lock: &client->packet_lock); |
307 | |
308 | if (client->ready) { |
309 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
310 | wake_readers = 1; |
311 | } |
312 | } |
313 | rcu_read_unlock(); |
314 | |
315 | if (wake_readers) |
316 | wake_up_interruptible(&mousedev->wait); |
317 | } |
318 | |
319 | static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) |
320 | { |
321 | if (!value) { |
322 | if (mousedev->touch && |
323 | time_before(jiffies, |
324 | mousedev->touch + msecs_to_jiffies(tap_time))) { |
325 | /* |
326 | * Toggle left button to emulate tap. |
327 | * We rely on the fact that mousedev_mix always has 0 |
328 | * motion packet so we won't mess current position. |
329 | */ |
330 | set_bit(nr: 0, addr: &mousedev->packet.buttons); |
331 | set_bit(nr: 0, addr: &mousedev_mix->packet.buttons); |
332 | mousedev_notify_readers(mousedev, packet: &mousedev_mix->packet); |
333 | mousedev_notify_readers(mousedev: mousedev_mix, |
334 | packet: &mousedev_mix->packet); |
335 | clear_bit(nr: 0, addr: &mousedev->packet.buttons); |
336 | clear_bit(nr: 0, addr: &mousedev_mix->packet.buttons); |
337 | } |
338 | mousedev->touch = mousedev->pkt_count = 0; |
339 | mousedev->frac_dx = 0; |
340 | mousedev->frac_dy = 0; |
341 | |
342 | } else if (!mousedev->touch) |
343 | mousedev->touch = jiffies; |
344 | } |
345 | |
346 | static void mousedev_event(struct input_handle *handle, |
347 | unsigned int type, unsigned int code, int value) |
348 | { |
349 | struct mousedev *mousedev = handle->private; |
350 | |
351 | switch (type) { |
352 | |
353 | case EV_ABS: |
354 | /* Ignore joysticks */ |
355 | if (test_bit(BTN_TRIGGER, handle->dev->keybit)) |
356 | return; |
357 | |
358 | if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) |
359 | mousedev_touchpad_event(dev: handle->dev, |
360 | mousedev, code, value); |
361 | else |
362 | mousedev_abs_event(dev: handle->dev, mousedev, code, value); |
363 | |
364 | break; |
365 | |
366 | case EV_REL: |
367 | mousedev_rel_event(mousedev, code, value); |
368 | break; |
369 | |
370 | case EV_KEY: |
371 | if (value != 2) { |
372 | if (code == BTN_TOUCH && |
373 | test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) |
374 | mousedev_touchpad_touch(mousedev, value); |
375 | else |
376 | mousedev_key_event(mousedev, code, value); |
377 | } |
378 | break; |
379 | |
380 | case EV_SYN: |
381 | if (code == SYN_REPORT) { |
382 | if (mousedev->touch) { |
383 | mousedev->pkt_count++; |
384 | /* |
385 | * Input system eats duplicate events, |
386 | * but we need all of them to do correct |
387 | * averaging so apply present one forward |
388 | */ |
389 | fx(0) = fx(1); |
390 | fy(0) = fy(1); |
391 | } |
392 | |
393 | mousedev_notify_readers(mousedev, packet: &mousedev->packet); |
394 | mousedev_notify_readers(mousedev: mousedev_mix, packet: &mousedev->packet); |
395 | |
396 | mousedev->packet.dx = mousedev->packet.dy = |
397 | mousedev->packet.dz = 0; |
398 | mousedev->packet.abs_event = 0; |
399 | } |
400 | break; |
401 | } |
402 | } |
403 | |
404 | static int mousedev_fasync(int fd, struct file *file, int on) |
405 | { |
406 | struct mousedev_client *client = file->private_data; |
407 | |
408 | return fasync_helper(fd, file, on, &client->fasync); |
409 | } |
410 | |
411 | static void mousedev_free(struct device *dev) |
412 | { |
413 | struct mousedev *mousedev = container_of(dev, struct mousedev, dev); |
414 | |
415 | input_put_device(dev: mousedev->handle.dev); |
416 | kfree(objp: mousedev); |
417 | } |
418 | |
419 | static int mousedev_open_device(struct mousedev *mousedev) |
420 | { |
421 | int retval; |
422 | |
423 | retval = mutex_lock_interruptible(&mousedev->mutex); |
424 | if (retval) |
425 | return retval; |
426 | |
427 | if (!mousedev->exist) |
428 | retval = -ENODEV; |
429 | else if (!mousedev->open++) { |
430 | retval = input_open_device(&mousedev->handle); |
431 | if (retval) |
432 | mousedev->open--; |
433 | } |
434 | |
435 | mutex_unlock(lock: &mousedev->mutex); |
436 | return retval; |
437 | } |
438 | |
439 | static void mousedev_close_device(struct mousedev *mousedev) |
440 | { |
441 | mutex_lock(&mousedev->mutex); |
442 | |
443 | if (mousedev->exist && !--mousedev->open) |
444 | input_close_device(&mousedev->handle); |
445 | |
446 | mutex_unlock(lock: &mousedev->mutex); |
447 | } |
448 | |
449 | /* |
450 | * Open all available devices so they can all be multiplexed in one. |
451 | * stream. Note that this function is called with mousedev_mix->mutex |
452 | * held. |
453 | */ |
454 | static int mixdev_open_devices(struct mousedev *mixdev) |
455 | { |
456 | int error; |
457 | |
458 | error = mutex_lock_interruptible(&mixdev->mutex); |
459 | if (error) |
460 | return error; |
461 | |
462 | if (!mixdev->open++) { |
463 | struct mousedev *mousedev; |
464 | |
465 | list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { |
466 | if (!mousedev->opened_by_mixdev) { |
467 | if (mousedev_open_device(mousedev)) |
468 | continue; |
469 | |
470 | mousedev->opened_by_mixdev = true; |
471 | } |
472 | } |
473 | } |
474 | |
475 | mutex_unlock(lock: &mixdev->mutex); |
476 | return 0; |
477 | } |
478 | |
479 | /* |
480 | * Close all devices that were opened as part of multiplexed |
481 | * device. Note that this function is called with mousedev_mix->mutex |
482 | * held. |
483 | */ |
484 | static void mixdev_close_devices(struct mousedev *mixdev) |
485 | { |
486 | mutex_lock(&mixdev->mutex); |
487 | |
488 | if (!--mixdev->open) { |
489 | struct mousedev *mousedev; |
490 | |
491 | list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { |
492 | if (mousedev->opened_by_mixdev) { |
493 | mousedev->opened_by_mixdev = false; |
494 | mousedev_close_device(mousedev); |
495 | } |
496 | } |
497 | } |
498 | |
499 | mutex_unlock(lock: &mixdev->mutex); |
500 | } |
501 | |
502 | |
503 | static void mousedev_attach_client(struct mousedev *mousedev, |
504 | struct mousedev_client *client) |
505 | { |
506 | spin_lock(lock: &mousedev->client_lock); |
507 | list_add_tail_rcu(new: &client->node, head: &mousedev->client_list); |
508 | spin_unlock(lock: &mousedev->client_lock); |
509 | } |
510 | |
511 | static void mousedev_detach_client(struct mousedev *mousedev, |
512 | struct mousedev_client *client) |
513 | { |
514 | spin_lock(lock: &mousedev->client_lock); |
515 | list_del_rcu(entry: &client->node); |
516 | spin_unlock(lock: &mousedev->client_lock); |
517 | synchronize_rcu(); |
518 | } |
519 | |
520 | static int mousedev_release(struct inode *inode, struct file *file) |
521 | { |
522 | struct mousedev_client *client = file->private_data; |
523 | struct mousedev *mousedev = client->mousedev; |
524 | |
525 | mousedev_detach_client(mousedev, client); |
526 | kfree(objp: client); |
527 | |
528 | mousedev->close_device(mousedev); |
529 | |
530 | return 0; |
531 | } |
532 | |
533 | static int mousedev_open(struct inode *inode, struct file *file) |
534 | { |
535 | struct mousedev_client *client; |
536 | struct mousedev *mousedev; |
537 | int error; |
538 | |
539 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX |
540 | if (imajor(inode) == MISC_MAJOR) |
541 | mousedev = mousedev_mix; |
542 | else |
543 | #endif |
544 | mousedev = container_of(inode->i_cdev, struct mousedev, cdev); |
545 | |
546 | client = kzalloc(size: sizeof(struct mousedev_client), GFP_KERNEL); |
547 | if (!client) |
548 | return -ENOMEM; |
549 | |
550 | spin_lock_init(&client->packet_lock); |
551 | client->pos_x = xres / 2; |
552 | client->pos_y = yres / 2; |
553 | client->mousedev = mousedev; |
554 | mousedev_attach_client(mousedev, client); |
555 | |
556 | error = mousedev->open_device(mousedev); |
557 | if (error) |
558 | goto err_free_client; |
559 | |
560 | file->private_data = client; |
561 | stream_open(inode, filp: file); |
562 | |
563 | return 0; |
564 | |
565 | err_free_client: |
566 | mousedev_detach_client(mousedev, client); |
567 | kfree(objp: client); |
568 | return error; |
569 | } |
570 | |
571 | static void mousedev_packet(struct mousedev_client *client, u8 *ps2_data) |
572 | { |
573 | struct mousedev_motion *p = &client->packets[client->tail]; |
574 | s8 dx, dy, dz; |
575 | |
576 | dx = clamp_val(p->dx, -127, 127); |
577 | p->dx -= dx; |
578 | |
579 | dy = clamp_val(p->dy, -127, 127); |
580 | p->dy -= dy; |
581 | |
582 | ps2_data[0] = BIT(3); |
583 | ps2_data[0] |= ((dx & BIT(7)) >> 3) | ((dy & BIT(7)) >> 2); |
584 | ps2_data[0] |= p->buttons & 0x07; |
585 | ps2_data[1] = dx; |
586 | ps2_data[2] = dy; |
587 | |
588 | switch (client->mode) { |
589 | case MOUSEDEV_EMUL_EXPS: |
590 | dz = clamp_val(p->dz, -7, 7); |
591 | p->dz -= dz; |
592 | |
593 | ps2_data[3] = (dz & 0x0f) | ((p->buttons & 0x18) << 1); |
594 | client->bufsiz = 4; |
595 | break; |
596 | |
597 | case MOUSEDEV_EMUL_IMPS: |
598 | dz = clamp_val(p->dz, -127, 127); |
599 | p->dz -= dz; |
600 | |
601 | ps2_data[0] |= ((p->buttons & 0x10) >> 3) | |
602 | ((p->buttons & 0x08) >> 1); |
603 | ps2_data[3] = dz; |
604 | |
605 | client->bufsiz = 4; |
606 | break; |
607 | |
608 | case MOUSEDEV_EMUL_PS2: |
609 | default: |
610 | p->dz = 0; |
611 | |
612 | ps2_data[0] |= ((p->buttons & 0x10) >> 3) | |
613 | ((p->buttons & 0x08) >> 1); |
614 | |
615 | client->bufsiz = 3; |
616 | break; |
617 | } |
618 | |
619 | if (!p->dx && !p->dy && !p->dz) { |
620 | if (client->tail == client->head) { |
621 | client->ready = 0; |
622 | client->last_buttons = p->buttons; |
623 | } else |
624 | client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; |
625 | } |
626 | } |
627 | |
628 | static void mousedev_generate_response(struct mousedev_client *client, |
629 | int command) |
630 | { |
631 | client->ps2[0] = 0xfa; /* ACK */ |
632 | |
633 | switch (command) { |
634 | |
635 | case 0xeb: /* Poll */ |
636 | mousedev_packet(client, ps2_data: &client->ps2[1]); |
637 | client->bufsiz++; /* account for leading ACK */ |
638 | break; |
639 | |
640 | case 0xf2: /* Get ID */ |
641 | switch (client->mode) { |
642 | case MOUSEDEV_EMUL_PS2: |
643 | client->ps2[1] = 0; |
644 | break; |
645 | case MOUSEDEV_EMUL_IMPS: |
646 | client->ps2[1] = 3; |
647 | break; |
648 | case MOUSEDEV_EMUL_EXPS: |
649 | client->ps2[1] = 4; |
650 | break; |
651 | } |
652 | client->bufsiz = 2; |
653 | break; |
654 | |
655 | case 0xe9: /* Get info */ |
656 | client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; |
657 | client->bufsiz = 4; |
658 | break; |
659 | |
660 | case 0xff: /* Reset */ |
661 | client->impsseq = client->imexseq = 0; |
662 | client->mode = MOUSEDEV_EMUL_PS2; |
663 | client->ps2[1] = 0xaa; client->ps2[2] = 0x00; |
664 | client->bufsiz = 3; |
665 | break; |
666 | |
667 | default: |
668 | client->bufsiz = 1; |
669 | break; |
670 | } |
671 | client->buffer = client->bufsiz; |
672 | } |
673 | |
674 | static ssize_t mousedev_write(struct file *file, const char __user *buffer, |
675 | size_t count, loff_t *ppos) |
676 | { |
677 | struct mousedev_client *client = file->private_data; |
678 | unsigned char c; |
679 | unsigned int i; |
680 | |
681 | for (i = 0; i < count; i++) { |
682 | |
683 | if (get_user(c, buffer + i)) |
684 | return -EFAULT; |
685 | |
686 | spin_lock_irq(lock: &client->packet_lock); |
687 | |
688 | if (c == mousedev_imex_seq[client->imexseq]) { |
689 | if (++client->imexseq == MOUSEDEV_SEQ_LEN) { |
690 | client->imexseq = 0; |
691 | client->mode = MOUSEDEV_EMUL_EXPS; |
692 | } |
693 | } else |
694 | client->imexseq = 0; |
695 | |
696 | if (c == mousedev_imps_seq[client->impsseq]) { |
697 | if (++client->impsseq == MOUSEDEV_SEQ_LEN) { |
698 | client->impsseq = 0; |
699 | client->mode = MOUSEDEV_EMUL_IMPS; |
700 | } |
701 | } else |
702 | client->impsseq = 0; |
703 | |
704 | mousedev_generate_response(client, command: c); |
705 | |
706 | spin_unlock_irq(lock: &client->packet_lock); |
707 | cond_resched(); |
708 | } |
709 | |
710 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
711 | wake_up_interruptible(&client->mousedev->wait); |
712 | |
713 | return count; |
714 | } |
715 | |
716 | static ssize_t mousedev_read(struct file *file, char __user *buffer, |
717 | size_t count, loff_t *ppos) |
718 | { |
719 | struct mousedev_client *client = file->private_data; |
720 | struct mousedev *mousedev = client->mousedev; |
721 | u8 data[sizeof(client->ps2)]; |
722 | int retval = 0; |
723 | |
724 | if (!client->ready && !client->buffer && mousedev->exist && |
725 | (file->f_flags & O_NONBLOCK)) |
726 | return -EAGAIN; |
727 | |
728 | retval = wait_event_interruptible(mousedev->wait, |
729 | !mousedev->exist || client->ready || client->buffer); |
730 | if (retval) |
731 | return retval; |
732 | |
733 | if (!mousedev->exist) |
734 | return -ENODEV; |
735 | |
736 | spin_lock_irq(lock: &client->packet_lock); |
737 | |
738 | if (!client->buffer && client->ready) { |
739 | mousedev_packet(client, ps2_data: client->ps2); |
740 | client->buffer = client->bufsiz; |
741 | } |
742 | |
743 | if (count > client->buffer) |
744 | count = client->buffer; |
745 | |
746 | memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); |
747 | client->buffer -= count; |
748 | |
749 | spin_unlock_irq(lock: &client->packet_lock); |
750 | |
751 | if (copy_to_user(to: buffer, from: data, n: count)) |
752 | return -EFAULT; |
753 | |
754 | return count; |
755 | } |
756 | |
757 | /* No kernel lock - fine */ |
758 | static __poll_t mousedev_poll(struct file *file, poll_table *wait) |
759 | { |
760 | struct mousedev_client *client = file->private_data; |
761 | struct mousedev *mousedev = client->mousedev; |
762 | __poll_t mask; |
763 | |
764 | poll_wait(filp: file, wait_address: &mousedev->wait, p: wait); |
765 | |
766 | mask = mousedev->exist ? EPOLLOUT | EPOLLWRNORM : EPOLLHUP | EPOLLERR; |
767 | if (client->ready || client->buffer) |
768 | mask |= EPOLLIN | EPOLLRDNORM; |
769 | |
770 | return mask; |
771 | } |
772 | |
773 | static const struct file_operations mousedev_fops = { |
774 | .owner = THIS_MODULE, |
775 | .read = mousedev_read, |
776 | .write = mousedev_write, |
777 | .poll = mousedev_poll, |
778 | .open = mousedev_open, |
779 | .release = mousedev_release, |
780 | .fasync = mousedev_fasync, |
781 | .llseek = noop_llseek, |
782 | }; |
783 | |
784 | /* |
785 | * Mark device non-existent. This disables writes, ioctls and |
786 | * prevents new users from opening the device. Already posted |
787 | * blocking reads will stay, however new ones will fail. |
788 | */ |
789 | static void mousedev_mark_dead(struct mousedev *mousedev) |
790 | { |
791 | mutex_lock(&mousedev->mutex); |
792 | mousedev->exist = false; |
793 | mutex_unlock(lock: &mousedev->mutex); |
794 | } |
795 | |
796 | /* |
797 | * Wake up users waiting for IO so they can disconnect from |
798 | * dead device. |
799 | */ |
800 | static void mousedev_hangup(struct mousedev *mousedev) |
801 | { |
802 | struct mousedev_client *client; |
803 | |
804 | spin_lock(lock: &mousedev->client_lock); |
805 | list_for_each_entry(client, &mousedev->client_list, node) |
806 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
807 | spin_unlock(lock: &mousedev->client_lock); |
808 | |
809 | wake_up_interruptible(&mousedev->wait); |
810 | } |
811 | |
812 | static void mousedev_cleanup(struct mousedev *mousedev) |
813 | { |
814 | struct input_handle *handle = &mousedev->handle; |
815 | |
816 | mousedev_mark_dead(mousedev); |
817 | mousedev_hangup(mousedev); |
818 | |
819 | /* mousedev is marked dead so no one else accesses mousedev->open */ |
820 | if (mousedev->open) |
821 | input_close_device(handle); |
822 | } |
823 | |
824 | static int mousedev_reserve_minor(bool mixdev) |
825 | { |
826 | int minor; |
827 | |
828 | if (mixdev) { |
829 | minor = input_get_new_minor(MOUSEDEV_MIX, legacy_num: 1, allow_dynamic: false); |
830 | if (minor < 0) |
831 | pr_err("failed to reserve mixdev minor: %d\n" , minor); |
832 | } else { |
833 | minor = input_get_new_minor(MOUSEDEV_MINOR_BASE, |
834 | MOUSEDEV_MINORS, allow_dynamic: true); |
835 | if (minor < 0) |
836 | pr_err("failed to reserve new minor: %d\n" , minor); |
837 | } |
838 | |
839 | return minor; |
840 | } |
841 | |
842 | static struct mousedev *mousedev_create(struct input_dev *dev, |
843 | struct input_handler *handler, |
844 | bool mixdev) |
845 | { |
846 | struct mousedev *mousedev; |
847 | int minor; |
848 | int error; |
849 | |
850 | minor = mousedev_reserve_minor(mixdev); |
851 | if (minor < 0) { |
852 | error = minor; |
853 | goto err_out; |
854 | } |
855 | |
856 | mousedev = kzalloc(size: sizeof(struct mousedev), GFP_KERNEL); |
857 | if (!mousedev) { |
858 | error = -ENOMEM; |
859 | goto err_free_minor; |
860 | } |
861 | |
862 | INIT_LIST_HEAD(list: &mousedev->client_list); |
863 | INIT_LIST_HEAD(list: &mousedev->mixdev_node); |
864 | spin_lock_init(&mousedev->client_lock); |
865 | mutex_init(&mousedev->mutex); |
866 | lockdep_set_subclass(&mousedev->mutex, |
867 | mixdev ? SINGLE_DEPTH_NESTING : 0); |
868 | init_waitqueue_head(&mousedev->wait); |
869 | |
870 | if (mixdev) { |
871 | dev_set_name(dev: &mousedev->dev, name: "mice" ); |
872 | |
873 | mousedev->open_device = mixdev_open_devices; |
874 | mousedev->close_device = mixdev_close_devices; |
875 | } else { |
876 | int dev_no = minor; |
877 | /* Normalize device number if it falls into legacy range */ |
878 | if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS) |
879 | dev_no -= MOUSEDEV_MINOR_BASE; |
880 | dev_set_name(dev: &mousedev->dev, name: "mouse%d" , dev_no); |
881 | |
882 | mousedev->open_device = mousedev_open_device; |
883 | mousedev->close_device = mousedev_close_device; |
884 | } |
885 | |
886 | mousedev->exist = true; |
887 | mousedev->handle.dev = input_get_device(dev); |
888 | mousedev->handle.name = dev_name(dev: &mousedev->dev); |
889 | mousedev->handle.handler = handler; |
890 | mousedev->handle.private = mousedev; |
891 | |
892 | mousedev->dev.class = &input_class; |
893 | if (dev) |
894 | mousedev->dev.parent = &dev->dev; |
895 | mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
896 | mousedev->dev.release = mousedev_free; |
897 | device_initialize(dev: &mousedev->dev); |
898 | |
899 | if (!mixdev) { |
900 | error = input_register_handle(&mousedev->handle); |
901 | if (error) |
902 | goto err_free_mousedev; |
903 | } |
904 | |
905 | cdev_init(&mousedev->cdev, &mousedev_fops); |
906 | |
907 | error = cdev_device_add(cdev: &mousedev->cdev, dev: &mousedev->dev); |
908 | if (error) |
909 | goto err_cleanup_mousedev; |
910 | |
911 | return mousedev; |
912 | |
913 | err_cleanup_mousedev: |
914 | mousedev_cleanup(mousedev); |
915 | if (!mixdev) |
916 | input_unregister_handle(&mousedev->handle); |
917 | err_free_mousedev: |
918 | put_device(dev: &mousedev->dev); |
919 | err_free_minor: |
920 | input_free_minor(minor); |
921 | err_out: |
922 | return ERR_PTR(error); |
923 | } |
924 | |
925 | static void mousedev_destroy(struct mousedev *mousedev) |
926 | { |
927 | cdev_device_del(cdev: &mousedev->cdev, dev: &mousedev->dev); |
928 | mousedev_cleanup(mousedev); |
929 | input_free_minor(MINOR(mousedev->dev.devt)); |
930 | if (mousedev != mousedev_mix) |
931 | input_unregister_handle(&mousedev->handle); |
932 | put_device(dev: &mousedev->dev); |
933 | } |
934 | |
935 | static int mixdev_add_device(struct mousedev *mousedev) |
936 | { |
937 | int retval; |
938 | |
939 | retval = mutex_lock_interruptible(&mousedev_mix->mutex); |
940 | if (retval) |
941 | return retval; |
942 | |
943 | if (mousedev_mix->open) { |
944 | retval = mousedev_open_device(mousedev); |
945 | if (retval) |
946 | goto out; |
947 | |
948 | mousedev->opened_by_mixdev = true; |
949 | } |
950 | |
951 | get_device(dev: &mousedev->dev); |
952 | list_add_tail(new: &mousedev->mixdev_node, head: &mousedev_mix_list); |
953 | |
954 | out: |
955 | mutex_unlock(lock: &mousedev_mix->mutex); |
956 | return retval; |
957 | } |
958 | |
959 | static void mixdev_remove_device(struct mousedev *mousedev) |
960 | { |
961 | mutex_lock(&mousedev_mix->mutex); |
962 | |
963 | if (mousedev->opened_by_mixdev) { |
964 | mousedev->opened_by_mixdev = false; |
965 | mousedev_close_device(mousedev); |
966 | } |
967 | |
968 | list_del_init(entry: &mousedev->mixdev_node); |
969 | mutex_unlock(lock: &mousedev_mix->mutex); |
970 | |
971 | put_device(dev: &mousedev->dev); |
972 | } |
973 | |
974 | static int mousedev_connect(struct input_handler *handler, |
975 | struct input_dev *dev, |
976 | const struct input_device_id *id) |
977 | { |
978 | struct mousedev *mousedev; |
979 | int error; |
980 | |
981 | mousedev = mousedev_create(dev, handler, mixdev: false); |
982 | if (IS_ERR(ptr: mousedev)) |
983 | return PTR_ERR(ptr: mousedev); |
984 | |
985 | error = mixdev_add_device(mousedev); |
986 | if (error) { |
987 | mousedev_destroy(mousedev); |
988 | return error; |
989 | } |
990 | |
991 | return 0; |
992 | } |
993 | |
994 | static void mousedev_disconnect(struct input_handle *handle) |
995 | { |
996 | struct mousedev *mousedev = handle->private; |
997 | |
998 | mixdev_remove_device(mousedev); |
999 | mousedev_destroy(mousedev); |
1000 | } |
1001 | |
1002 | static const struct input_device_id mousedev_ids[] = { |
1003 | { |
1004 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
1005 | INPUT_DEVICE_ID_MATCH_KEYBIT | |
1006 | INPUT_DEVICE_ID_MATCH_RELBIT, |
1007 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, |
1008 | .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, |
1009 | .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, |
1010 | }, /* A mouse like device, at least one button, |
1011 | two relative axes */ |
1012 | { |
1013 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
1014 | INPUT_DEVICE_ID_MATCH_RELBIT, |
1015 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, |
1016 | .relbit = { BIT_MASK(REL_WHEEL) }, |
1017 | }, /* A separate scrollwheel */ |
1018 | { |
1019 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
1020 | INPUT_DEVICE_ID_MATCH_KEYBIT | |
1021 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
1022 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, |
1023 | .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, |
1024 | .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, |
1025 | }, /* A tablet like device, at least touch detection, |
1026 | two absolute axes */ |
1027 | { |
1028 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
1029 | INPUT_DEVICE_ID_MATCH_KEYBIT | |
1030 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
1031 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, |
1032 | .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = |
1033 | BIT_MASK(BTN_TOOL_FINGER) }, |
1034 | .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | |
1035 | BIT_MASK(ABS_PRESSURE) | |
1036 | BIT_MASK(ABS_TOOL_WIDTH) }, |
1037 | }, /* A touchpad */ |
1038 | { |
1039 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
1040 | INPUT_DEVICE_ID_MATCH_KEYBIT | |
1041 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
1042 | .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, |
1043 | .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, |
1044 | .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, |
1045 | }, /* Mouse-like device with absolute X and Y but ordinary |
1046 | clicks, like hp ILO2 High Performance mouse */ |
1047 | |
1048 | { }, /* Terminating entry */ |
1049 | }; |
1050 | |
1051 | MODULE_DEVICE_TABLE(input, mousedev_ids); |
1052 | |
1053 | static struct input_handler mousedev_handler = { |
1054 | .event = mousedev_event, |
1055 | .connect = mousedev_connect, |
1056 | .disconnect = mousedev_disconnect, |
1057 | .legacy_minors = true, |
1058 | .minor = MOUSEDEV_MINOR_BASE, |
1059 | .name = "mousedev" , |
1060 | .id_table = mousedev_ids, |
1061 | }; |
1062 | |
1063 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX |
1064 | #include <linux/miscdevice.h> |
1065 | |
1066 | static struct miscdevice psaux_mouse = { |
1067 | .minor = PSMOUSE_MINOR, |
1068 | .name = "psaux" , |
1069 | .fops = &mousedev_fops, |
1070 | }; |
1071 | |
1072 | static bool psaux_registered; |
1073 | |
1074 | static void __init mousedev_psaux_register(void) |
1075 | { |
1076 | int error; |
1077 | |
1078 | error = misc_register(misc: &psaux_mouse); |
1079 | if (error) |
1080 | pr_warn("could not register psaux device, error: %d\n" , |
1081 | error); |
1082 | else |
1083 | psaux_registered = true; |
1084 | } |
1085 | |
1086 | static void __exit mousedev_psaux_unregister(void) |
1087 | { |
1088 | if (psaux_registered) |
1089 | misc_deregister(misc: &psaux_mouse); |
1090 | } |
1091 | #else |
1092 | static inline void mousedev_psaux_register(void) { } |
1093 | static inline void mousedev_psaux_unregister(void) { } |
1094 | #endif |
1095 | |
1096 | static int __init mousedev_init(void) |
1097 | { |
1098 | int error; |
1099 | |
1100 | mousedev_mix = mousedev_create(NULL, handler: &mousedev_handler, mixdev: true); |
1101 | if (IS_ERR(ptr: mousedev_mix)) |
1102 | return PTR_ERR(ptr: mousedev_mix); |
1103 | |
1104 | error = input_register_handler(&mousedev_handler); |
1105 | if (error) { |
1106 | mousedev_destroy(mousedev: mousedev_mix); |
1107 | return error; |
1108 | } |
1109 | |
1110 | mousedev_psaux_register(); |
1111 | |
1112 | pr_info("PS/2 mouse device common for all mice\n" ); |
1113 | |
1114 | return 0; |
1115 | } |
1116 | |
1117 | static void __exit mousedev_exit(void) |
1118 | { |
1119 | mousedev_psaux_unregister(); |
1120 | input_unregister_handler(&mousedev_handler); |
1121 | mousedev_destroy(mousedev: mousedev_mix); |
1122 | } |
1123 | |
1124 | module_init(mousedev_init); |
1125 | module_exit(mousedev_exit); |
1126 | |