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1da177e4 LT |
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 | ||
4f00469c | 12 | #define MOUSEDEV_MINOR_BASE 32 |
1da177e4 LT |
13 | #define MOUSEDEV_MINORS 32 |
14 | #define MOUSEDEV_MIX 31 | |
15 | ||
16 | #include <linux/slab.h> | |
17 | #include <linux/poll.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/moduleparam.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/input.h> | |
22 | #include <linux/config.h> | |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/random.h> | |
25 | #include <linux/major.h> | |
26 | #include <linux/device.h> | |
1da177e4 LT |
27 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX |
28 | #include <linux/miscdevice.h> | |
29 | #endif | |
30 | ||
31 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
32 | MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X | |
36 | #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 | |
37 | #endif | |
38 | #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y | |
39 | #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 | |
40 | #endif | |
41 | ||
42 | static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; | |
84c12b24 | 43 | module_param(xres, uint, 0644); |
1da177e4 LT |
44 | MODULE_PARM_DESC(xres, "Horizontal screen resolution"); |
45 | ||
46 | static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; | |
84c12b24 | 47 | module_param(yres, uint, 0644); |
1da177e4 LT |
48 | MODULE_PARM_DESC(yres, "Vertical screen resolution"); |
49 | ||
50 | static unsigned tap_time = 200; | |
84c12b24 | 51 | module_param(tap_time, uint, 0644); |
1da177e4 LT |
52 | MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); |
53 | ||
54 | struct mousedev_hw_data { | |
55 | int dx, dy, dz; | |
56 | int x, y; | |
57 | int abs_event; | |
58 | unsigned long buttons; | |
59 | }; | |
60 | ||
61 | struct mousedev { | |
62 | int exist; | |
63 | int open; | |
64 | int minor; | |
65 | char name[16]; | |
66 | wait_queue_head_t wait; | |
67 | struct list_head list; | |
68 | struct input_handle handle; | |
69 | ||
70 | struct mousedev_hw_data packet; | |
71 | unsigned int pkt_count; | |
72 | int old_x[4], old_y[4]; | |
73 | int frac_dx, frac_dy; | |
74 | unsigned long touch; | |
75 | }; | |
76 | ||
77 | enum mousedev_emul { | |
78 | MOUSEDEV_EMUL_PS2, | |
79 | MOUSEDEV_EMUL_IMPS, | |
80 | MOUSEDEV_EMUL_EXPS | |
81 | }; | |
82 | ||
83 | struct mousedev_motion { | |
84 | int dx, dy, dz; | |
85 | unsigned long buttons; | |
86 | }; | |
87 | ||
88 | #define PACKET_QUEUE_LEN 16 | |
89 | struct mousedev_list { | |
90 | struct fasync_struct *fasync; | |
91 | struct mousedev *mousedev; | |
92 | struct list_head node; | |
93 | ||
94 | struct mousedev_motion packets[PACKET_QUEUE_LEN]; | |
95 | unsigned int head, tail; | |
96 | spinlock_t packet_lock; | |
97 | int pos_x, pos_y; | |
98 | ||
99 | signed char ps2[6]; | |
100 | unsigned char ready, buffer, bufsiz; | |
101 | unsigned char imexseq, impsseq; | |
102 | enum mousedev_emul mode; | |
c1e4c8d3 | 103 | unsigned long last_buttons; |
1da177e4 LT |
104 | }; |
105 | ||
106 | #define MOUSEDEV_SEQ_LEN 6 | |
107 | ||
108 | static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; | |
109 | static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; | |
110 | ||
111 | static struct input_handler mousedev_handler; | |
112 | ||
113 | static struct mousedev *mousedev_table[MOUSEDEV_MINORS]; | |
114 | static struct mousedev mousedev_mix; | |
115 | ||
116 | #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) | |
117 | #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) | |
118 | ||
119 | static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value) | |
120 | { | |
121 | int size, tmp; | |
122 | enum { FRACTION_DENOM = 128 }; | |
123 | ||
124 | if (mousedev->touch) { | |
125 | size = dev->absmax[ABS_X] - dev->absmin[ABS_X]; | |
126 | if (size == 0) size = 256 * 2; | |
127 | switch (code) { | |
128 | case ABS_X: | |
129 | fx(0) = value; | |
130 | if (mousedev->pkt_count >= 2) { | |
131 | tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size; | |
132 | tmp += mousedev->frac_dx; | |
133 | mousedev->packet.dx = tmp / FRACTION_DENOM; | |
134 | mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM; | |
135 | } | |
136 | break; | |
137 | ||
138 | case ABS_Y: | |
139 | fy(0) = value; | |
140 | if (mousedev->pkt_count >= 2) { | |
141 | tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size; | |
142 | tmp += mousedev->frac_dy; | |
143 | mousedev->packet.dy = tmp / FRACTION_DENOM; | |
144 | mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM; | |
145 | } | |
146 | break; | |
147 | } | |
148 | } | |
149 | } | |
150 | ||
151 | static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value) | |
152 | { | |
153 | int size; | |
154 | ||
155 | switch (code) { | |
156 | case ABS_X: | |
157 | size = dev->absmax[ABS_X] - dev->absmin[ABS_X]; | |
84c12b24 | 158 | if (size == 0) size = xres ? : 1; |
1da177e4 LT |
159 | if (value > dev->absmax[ABS_X]) value = dev->absmax[ABS_X]; |
160 | if (value < dev->absmin[ABS_X]) value = dev->absmin[ABS_X]; | |
161 | mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size; | |
162 | mousedev->packet.abs_event = 1; | |
163 | break; | |
164 | ||
165 | case ABS_Y: | |
166 | size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y]; | |
84c12b24 | 167 | if (size == 0) size = yres ? : 1; |
1da177e4 LT |
168 | if (value > dev->absmax[ABS_Y]) value = dev->absmax[ABS_Y]; |
169 | if (value < dev->absmin[ABS_Y]) value = dev->absmin[ABS_Y]; | |
170 | mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size; | |
171 | mousedev->packet.abs_event = 1; | |
172 | break; | |
173 | } | |
174 | } | |
175 | ||
176 | static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value) | |
177 | { | |
178 | switch (code) { | |
179 | case REL_X: mousedev->packet.dx += value; break; | |
180 | case REL_Y: mousedev->packet.dy -= value; break; | |
181 | case REL_WHEEL: mousedev->packet.dz -= value; break; | |
182 | } | |
183 | } | |
184 | ||
185 | static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value) | |
186 | { | |
187 | int index; | |
188 | ||
189 | switch (code) { | |
190 | case BTN_TOUCH: | |
191 | case BTN_0: | |
192 | case BTN_FORWARD: | |
193 | case BTN_LEFT: index = 0; break; | |
194 | case BTN_STYLUS: | |
195 | case BTN_1: | |
196 | case BTN_RIGHT: index = 1; break; | |
197 | case BTN_2: | |
198 | case BTN_STYLUS2: | |
199 | case BTN_MIDDLE: index = 2; break; | |
200 | case BTN_3: | |
201 | case BTN_BACK: | |
202 | case BTN_SIDE: index = 3; break; | |
203 | case BTN_4: | |
204 | case BTN_EXTRA: index = 4; break; | |
205 | default: return; | |
206 | } | |
207 | ||
208 | if (value) { | |
209 | set_bit(index, &mousedev->packet.buttons); | |
210 | set_bit(index, &mousedev_mix.packet.buttons); | |
211 | } else { | |
212 | clear_bit(index, &mousedev->packet.buttons); | |
213 | clear_bit(index, &mousedev_mix.packet.buttons); | |
214 | } | |
215 | } | |
216 | ||
217 | static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet) | |
218 | { | |
219 | struct mousedev_list *list; | |
220 | struct mousedev_motion *p; | |
221 | unsigned long flags; | |
8121152c | 222 | int wake_readers = 0; |
1da177e4 LT |
223 | |
224 | list_for_each_entry(list, &mousedev->list, node) { | |
225 | spin_lock_irqsave(&list->packet_lock, flags); | |
226 | ||
227 | p = &list->packets[list->head]; | |
c1e4c8d3 | 228 | if (list->ready && p->buttons != mousedev->packet.buttons) { |
1da177e4 LT |
229 | unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN; |
230 | if (new_head != list->tail) { | |
231 | p = &list->packets[list->head = new_head]; | |
232 | memset(p, 0, sizeof(struct mousedev_motion)); | |
233 | } | |
234 | } | |
235 | ||
236 | if (packet->abs_event) { | |
237 | p->dx += packet->x - list->pos_x; | |
238 | p->dy += packet->y - list->pos_y; | |
239 | list->pos_x = packet->x; | |
240 | list->pos_y = packet->y; | |
241 | } | |
242 | ||
243 | list->pos_x += packet->dx; | |
244 | list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x); | |
245 | list->pos_y += packet->dy; | |
246 | list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y); | |
247 | ||
248 | p->dx += packet->dx; | |
249 | p->dy += packet->dy; | |
250 | p->dz += packet->dz; | |
251 | p->buttons = mousedev->packet.buttons; | |
252 | ||
c1e4c8d3 PM |
253 | if (p->dx || p->dy || p->dz || p->buttons != list->last_buttons) |
254 | list->ready = 1; | |
1da177e4 LT |
255 | |
256 | spin_unlock_irqrestore(&list->packet_lock, flags); | |
c1e4c8d3 | 257 | |
8121152c | 258 | if (list->ready) { |
c1e4c8d3 | 259 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
8121152c DT |
260 | wake_readers = 1; |
261 | } | |
1da177e4 LT |
262 | } |
263 | ||
8121152c DT |
264 | if (wake_readers) |
265 | wake_up_interruptible(&mousedev->wait); | |
1da177e4 LT |
266 | } |
267 | ||
268 | static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) | |
269 | { | |
270 | if (!value) { | |
271 | if (mousedev->touch && | |
272 | time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) { | |
273 | /* | |
274 | * Toggle left button to emulate tap. | |
275 | * We rely on the fact that mousedev_mix always has 0 | |
276 | * motion packet so we won't mess current position. | |
277 | */ | |
278 | set_bit(0, &mousedev->packet.buttons); | |
279 | set_bit(0, &mousedev_mix.packet.buttons); | |
280 | mousedev_notify_readers(mousedev, &mousedev_mix.packet); | |
281 | mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet); | |
282 | clear_bit(0, &mousedev->packet.buttons); | |
283 | clear_bit(0, &mousedev_mix.packet.buttons); | |
284 | } | |
285 | mousedev->touch = mousedev->pkt_count = 0; | |
286 | mousedev->frac_dx = 0; | |
287 | mousedev->frac_dy = 0; | |
288 | } | |
289 | else | |
290 | if (!mousedev->touch) | |
291 | mousedev->touch = jiffies; | |
292 | } | |
293 | ||
294 | static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) | |
295 | { | |
296 | struct mousedev *mousedev = handle->private; | |
297 | ||
298 | switch (type) { | |
299 | case EV_ABS: | |
300 | /* Ignore joysticks */ | |
301 | if (test_bit(BTN_TRIGGER, handle->dev->keybit)) | |
302 | return; | |
303 | ||
304 | if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) | |
305 | mousedev_touchpad_event(handle->dev, mousedev, code, value); | |
306 | else | |
307 | mousedev_abs_event(handle->dev, mousedev, code, value); | |
308 | ||
309 | break; | |
310 | ||
311 | case EV_REL: | |
312 | mousedev_rel_event(mousedev, code, value); | |
313 | break; | |
314 | ||
315 | case EV_KEY: | |
316 | if (value != 2) { | |
317 | if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) | |
318 | mousedev_touchpad_touch(mousedev, value); | |
319 | else | |
320 | mousedev_key_event(mousedev, code, value); | |
321 | } | |
322 | break; | |
323 | ||
324 | case EV_SYN: | |
325 | if (code == SYN_REPORT) { | |
326 | if (mousedev->touch) { | |
327 | mousedev->pkt_count++; | |
328 | /* Input system eats duplicate events, but we need all of them | |
329 | * to do correct averaging so apply present one forward | |
330 | */ | |
331 | fx(0) = fx(1); | |
332 | fy(0) = fy(1); | |
333 | } | |
334 | ||
335 | mousedev_notify_readers(mousedev, &mousedev->packet); | |
336 | mousedev_notify_readers(&mousedev_mix, &mousedev->packet); | |
337 | ||
338 | mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0; | |
339 | mousedev->packet.abs_event = 0; | |
340 | } | |
341 | break; | |
342 | } | |
343 | } | |
344 | ||
345 | static int mousedev_fasync(int fd, struct file *file, int on) | |
346 | { | |
347 | int retval; | |
348 | struct mousedev_list *list = file->private_data; | |
349 | retval = fasync_helper(fd, file, on, &list->fasync); | |
350 | return retval < 0 ? retval : 0; | |
351 | } | |
352 | ||
353 | static void mousedev_free(struct mousedev *mousedev) | |
354 | { | |
355 | mousedev_table[mousedev->minor] = NULL; | |
356 | kfree(mousedev); | |
357 | } | |
358 | ||
359 | static int mixdev_release(void) | |
360 | { | |
361 | struct input_handle *handle; | |
362 | ||
363 | list_for_each_entry(handle, &mousedev_handler.h_list, h_node) { | |
364 | struct mousedev *mousedev = handle->private; | |
365 | ||
366 | if (!mousedev->open) { | |
367 | if (mousedev->exist) | |
368 | input_close_device(&mousedev->handle); | |
369 | else | |
370 | mousedev_free(mousedev); | |
371 | } | |
372 | } | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | static int mousedev_release(struct inode * inode, struct file * file) | |
378 | { | |
379 | struct mousedev_list *list = file->private_data; | |
380 | ||
381 | mousedev_fasync(-1, file, 0); | |
382 | ||
383 | list_del(&list->node); | |
384 | ||
385 | if (!--list->mousedev->open) { | |
386 | if (list->mousedev->minor == MOUSEDEV_MIX) | |
387 | return mixdev_release(); | |
388 | ||
389 | if (!mousedev_mix.open) { | |
390 | if (list->mousedev->exist) | |
391 | input_close_device(&list->mousedev->handle); | |
392 | else | |
393 | mousedev_free(list->mousedev); | |
394 | } | |
395 | } | |
396 | ||
397 | kfree(list); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static int mousedev_open(struct inode * inode, struct file * file) | |
402 | { | |
403 | struct mousedev_list *list; | |
404 | struct input_handle *handle; | |
405 | struct mousedev *mousedev; | |
406 | int i; | |
407 | ||
408 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX | |
409 | if (imajor(inode) == MISC_MAJOR) | |
410 | i = MOUSEDEV_MIX; | |
411 | else | |
412 | #endif | |
413 | i = iminor(inode) - MOUSEDEV_MINOR_BASE; | |
414 | ||
415 | if (i >= MOUSEDEV_MINORS || !mousedev_table[i]) | |
416 | return -ENODEV; | |
417 | ||
418 | if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL))) | |
419 | return -ENOMEM; | |
420 | memset(list, 0, sizeof(struct mousedev_list)); | |
421 | ||
422 | spin_lock_init(&list->packet_lock); | |
423 | list->pos_x = xres / 2; | |
424 | list->pos_y = yres / 2; | |
425 | list->mousedev = mousedev_table[i]; | |
426 | list_add_tail(&list->node, &mousedev_table[i]->list); | |
427 | file->private_data = list; | |
428 | ||
429 | if (!list->mousedev->open++) { | |
430 | if (list->mousedev->minor == MOUSEDEV_MIX) { | |
431 | list_for_each_entry(handle, &mousedev_handler.h_list, h_node) { | |
432 | mousedev = handle->private; | |
433 | if (!mousedev->open && mousedev->exist) | |
434 | input_open_device(handle); | |
435 | } | |
436 | } else | |
437 | if (!mousedev_mix.open && list->mousedev->exist) | |
438 | input_open_device(&list->mousedev->handle); | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static inline int mousedev_limit_delta(int delta, int limit) | |
445 | { | |
446 | return delta > limit ? limit : (delta < -limit ? -limit : delta); | |
447 | } | |
448 | ||
449 | static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data) | |
450 | { | |
451 | struct mousedev_motion *p; | |
452 | unsigned long flags; | |
453 | ||
454 | spin_lock_irqsave(&list->packet_lock, flags); | |
455 | p = &list->packets[list->tail]; | |
456 | ||
457 | ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); | |
458 | ps2_data[1] = mousedev_limit_delta(p->dx, 127); | |
459 | ps2_data[2] = mousedev_limit_delta(p->dy, 127); | |
460 | p->dx -= ps2_data[1]; | |
461 | p->dy -= ps2_data[2]; | |
462 | ||
463 | switch (list->mode) { | |
464 | case MOUSEDEV_EMUL_EXPS: | |
465 | ps2_data[3] = mousedev_limit_delta(p->dz, 7); | |
466 | p->dz -= ps2_data[3]; | |
467 | ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); | |
468 | list->bufsiz = 4; | |
469 | break; | |
470 | ||
471 | case MOUSEDEV_EMUL_IMPS: | |
472 | ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); | |
473 | ps2_data[3] = mousedev_limit_delta(p->dz, 127); | |
474 | p->dz -= ps2_data[3]; | |
475 | list->bufsiz = 4; | |
476 | break; | |
477 | ||
478 | case MOUSEDEV_EMUL_PS2: | |
479 | default: | |
480 | ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); | |
481 | p->dz = 0; | |
482 | list->bufsiz = 3; | |
483 | break; | |
484 | } | |
485 | ||
486 | if (!p->dx && !p->dy && !p->dz) { | |
c1e4c8d3 | 487 | if (list->tail == list->head) { |
1da177e4 | 488 | list->ready = 0; |
c1e4c8d3 PM |
489 | list->last_buttons = p->buttons; |
490 | } else | |
1da177e4 LT |
491 | list->tail = (list->tail + 1) % PACKET_QUEUE_LEN; |
492 | } | |
493 | ||
494 | spin_unlock_irqrestore(&list->packet_lock, flags); | |
495 | } | |
496 | ||
497 | ||
498 | static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
499 | { | |
500 | struct mousedev_list *list = file->private_data; | |
501 | unsigned char c; | |
502 | unsigned int i; | |
503 | ||
504 | for (i = 0; i < count; i++) { | |
505 | ||
506 | if (get_user(c, buffer + i)) | |
507 | return -EFAULT; | |
508 | ||
509 | if (c == mousedev_imex_seq[list->imexseq]) { | |
510 | if (++list->imexseq == MOUSEDEV_SEQ_LEN) { | |
511 | list->imexseq = 0; | |
512 | list->mode = MOUSEDEV_EMUL_EXPS; | |
513 | } | |
514 | } else list->imexseq = 0; | |
515 | ||
516 | if (c == mousedev_imps_seq[list->impsseq]) { | |
517 | if (++list->impsseq == MOUSEDEV_SEQ_LEN) { | |
518 | list->impsseq = 0; | |
519 | list->mode = MOUSEDEV_EMUL_IMPS; | |
520 | } | |
521 | } else list->impsseq = 0; | |
522 | ||
523 | list->ps2[0] = 0xfa; | |
524 | ||
525 | switch (c) { | |
526 | ||
527 | case 0xeb: /* Poll */ | |
528 | mousedev_packet(list, &list->ps2[1]); | |
529 | list->bufsiz++; /* account for leading ACK */ | |
530 | break; | |
531 | ||
532 | case 0xf2: /* Get ID */ | |
533 | switch (list->mode) { | |
534 | case MOUSEDEV_EMUL_PS2: list->ps2[1] = 0; break; | |
535 | case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break; | |
536 | case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break; | |
537 | } | |
538 | list->bufsiz = 2; | |
539 | break; | |
540 | ||
541 | case 0xe9: /* Get info */ | |
542 | list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200; | |
543 | list->bufsiz = 4; | |
544 | break; | |
545 | ||
546 | case 0xff: /* Reset */ | |
547 | list->impsseq = list->imexseq = 0; | |
548 | list->mode = MOUSEDEV_EMUL_PS2; | |
549 | list->ps2[1] = 0xaa; list->ps2[2] = 0x00; | |
550 | list->bufsiz = 3; | |
551 | break; | |
552 | ||
553 | default: | |
554 | list->bufsiz = 1; | |
555 | break; | |
556 | } | |
557 | ||
558 | list->buffer = list->bufsiz; | |
559 | } | |
560 | ||
561 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
562 | ||
563 | wake_up_interruptible(&list->mousedev->wait); | |
564 | ||
565 | return count; | |
566 | } | |
567 | ||
568 | static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
569 | { | |
570 | struct mousedev_list *list = file->private_data; | |
571 | int retval = 0; | |
572 | ||
573 | if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK)) | |
574 | return -EAGAIN; | |
575 | ||
576 | retval = wait_event_interruptible(list->mousedev->wait, | |
577 | !list->mousedev->exist || list->ready || list->buffer); | |
578 | ||
579 | if (retval) | |
580 | return retval; | |
581 | ||
582 | if (!list->mousedev->exist) | |
583 | return -ENODEV; | |
584 | ||
585 | if (!list->buffer && list->ready) { | |
586 | mousedev_packet(list, list->ps2); | |
587 | list->buffer = list->bufsiz; | |
588 | } | |
589 | ||
590 | if (count > list->buffer) | |
591 | count = list->buffer; | |
592 | ||
593 | list->buffer -= count; | |
594 | ||
595 | if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count)) | |
596 | return -EFAULT; | |
597 | ||
598 | return count; | |
599 | } | |
600 | ||
601 | /* No kernel lock - fine */ | |
602 | static unsigned int mousedev_poll(struct file *file, poll_table *wait) | |
603 | { | |
604 | struct mousedev_list *list = file->private_data; | |
605 | poll_wait(file, &list->mousedev->wait, wait); | |
606 | return ((list->ready || list->buffer) ? (POLLIN | POLLRDNORM) : 0) | | |
607 | (list->mousedev->exist ? 0 : (POLLHUP | POLLERR)); | |
608 | } | |
609 | ||
610 | static struct file_operations mousedev_fops = { | |
611 | .owner = THIS_MODULE, | |
612 | .read = mousedev_read, | |
613 | .write = mousedev_write, | |
614 | .poll = mousedev_poll, | |
615 | .open = mousedev_open, | |
616 | .release = mousedev_release, | |
617 | .fasync = mousedev_fasync, | |
618 | }; | |
619 | ||
620 | static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) | |
621 | { | |
622 | struct mousedev *mousedev; | |
c9bcd582 | 623 | struct class_device *cdev; |
1da177e4 LT |
624 | int minor = 0; |
625 | ||
626 | for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++); | |
627 | if (minor == MOUSEDEV_MINORS) { | |
628 | printk(KERN_ERR "mousedev: no more free mousedev devices\n"); | |
629 | return NULL; | |
630 | } | |
631 | ||
632 | if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL))) | |
633 | return NULL; | |
634 | memset(mousedev, 0, sizeof(struct mousedev)); | |
635 | ||
636 | INIT_LIST_HEAD(&mousedev->list); | |
637 | init_waitqueue_head(&mousedev->wait); | |
638 | ||
639 | mousedev->minor = minor; | |
640 | mousedev->exist = 1; | |
641 | mousedev->handle.dev = dev; | |
642 | mousedev->handle.name = mousedev->name; | |
643 | mousedev->handle.handler = handler; | |
644 | mousedev->handle.private = mousedev; | |
645 | sprintf(mousedev->name, "mouse%d", minor); | |
646 | ||
647 | if (mousedev_mix.open) | |
648 | input_open_device(&mousedev->handle); | |
649 | ||
650 | mousedev_table[minor] = mousedev; | |
651 | ||
c9bcd582 | 652 | cdev = class_device_create(&input_class, &dev->cdev, |
1235686f | 653 | MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor), |
c9bcd582 GKH |
654 | dev->cdev.dev, mousedev->name); |
655 | ||
656 | /* temporary symlink to keep userspace happy */ | |
657 | sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, | |
658 | mousedev->name); | |
1da177e4 LT |
659 | |
660 | return &mousedev->handle; | |
661 | } | |
662 | ||
663 | static void mousedev_disconnect(struct input_handle *handle) | |
664 | { | |
665 | struct mousedev *mousedev = handle->private; | |
666 | struct mousedev_list *list; | |
667 | ||
c9bcd582 | 668 | sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name); |
ea9f240b | 669 | class_device_destroy(&input_class, |
1235686f | 670 | MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor)); |
1da177e4 LT |
671 | mousedev->exist = 0; |
672 | ||
673 | if (mousedev->open) { | |
674 | input_close_device(handle); | |
675 | wake_up_interruptible(&mousedev->wait); | |
676 | list_for_each_entry(list, &mousedev->list, node) | |
677 | kill_fasync(&list->fasync, SIGIO, POLL_HUP); | |
678 | } else { | |
679 | if (mousedev_mix.open) | |
680 | input_close_device(handle); | |
681 | mousedev_free(mousedev); | |
682 | } | |
683 | } | |
684 | ||
685 | static struct input_device_id mousedev_ids[] = { | |
686 | { | |
687 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT, | |
688 | .evbit = { BIT(EV_KEY) | BIT(EV_REL) }, | |
689 | .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) }, | |
690 | .relbit = { BIT(REL_X) | BIT(REL_Y) }, | |
691 | }, /* A mouse like device, at least one button, two relative axes */ | |
692 | { | |
693 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT, | |
694 | .evbit = { BIT(EV_KEY) | BIT(EV_REL) }, | |
695 | .relbit = { BIT(REL_WHEEL) }, | |
696 | }, /* A separate scrollwheel */ | |
697 | { | |
698 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
699 | .evbit = { BIT(EV_KEY) | BIT(EV_ABS) }, | |
700 | .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, | |
701 | .absbit = { BIT(ABS_X) | BIT(ABS_Y) }, | |
702 | }, /* A tablet like device, at least touch detection, two absolute axes */ | |
703 | { | |
704 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
705 | .evbit = { BIT(EV_KEY) | BIT(EV_ABS) }, | |
706 | .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) }, | |
707 | .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) }, | |
708 | }, /* A touchpad */ | |
709 | ||
710 | { }, /* Terminating entry */ | |
711 | }; | |
712 | ||
713 | MODULE_DEVICE_TABLE(input, mousedev_ids); | |
714 | ||
715 | static struct input_handler mousedev_handler = { | |
716 | .event = mousedev_event, | |
717 | .connect = mousedev_connect, | |
718 | .disconnect = mousedev_disconnect, | |
719 | .fops = &mousedev_fops, | |
720 | .minor = MOUSEDEV_MINOR_BASE, | |
721 | .name = "mousedev", | |
722 | .id_table = mousedev_ids, | |
723 | }; | |
724 | ||
725 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX | |
726 | static struct miscdevice psaux_mouse = { | |
727 | PSMOUSE_MINOR, "psaux", &mousedev_fops | |
728 | }; | |
729 | static int psaux_registered; | |
730 | #endif | |
731 | ||
732 | static int __init mousedev_init(void) | |
733 | { | |
734 | input_register_handler(&mousedev_handler); | |
735 | ||
736 | memset(&mousedev_mix, 0, sizeof(struct mousedev)); | |
737 | INIT_LIST_HEAD(&mousedev_mix.list); | |
738 | init_waitqueue_head(&mousedev_mix.wait); | |
739 | mousedev_table[MOUSEDEV_MIX] = &mousedev_mix; | |
740 | mousedev_mix.exist = 1; | |
741 | mousedev_mix.minor = MOUSEDEV_MIX; | |
742 | ||
ea9f240b | 743 | class_device_create(&input_class, NULL, |
1235686f | 744 | MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice"); |
1da177e4 LT |
745 | |
746 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX | |
747 | if (!(psaux_registered = !misc_register(&psaux_mouse))) | |
748 | printk(KERN_WARNING "mice: could not misc_register the device\n"); | |
749 | #endif | |
750 | ||
751 | printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); | |
752 | ||
753 | return 0; | |
754 | } | |
755 | ||
756 | static void __exit mousedev_exit(void) | |
757 | { | |
758 | #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX | |
759 | if (psaux_registered) | |
760 | misc_deregister(&psaux_mouse); | |
761 | #endif | |
ea9f240b | 762 | class_device_destroy(&input_class, |
1235686f | 763 | MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX)); |
1da177e4 LT |
764 | input_unregister_handler(&mousedev_handler); |
765 | } | |
766 | ||
767 | module_init(mousedev_init); | |
768 | module_exit(mousedev_exit); |