1 /*
2  * PS/2 mouse driver
3  *
4  * Copyright (c) 1999-2002 Vojtech Pavlik
5  * Copyright (c) 2003-2004 Dmitry Torokhov
6  */
7 
8 /*
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License version 2 as published by
11  * the Free Software Foundation.
12  */
13 
14 #include <linux/delay.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/interrupt.h>
18 #include <linux/input.h>
19 #include <linux/serio.h>
20 #include <linux/init.h>
21 #include <linux/libps2.h>
22 #include <linux/mutex.h>
23 
24 #include "psmouse.h"
25 #include "synaptics.h"
26 #include "logips2pp.h"
27 #include "alps.h"
28 #include "hgpk.h"
29 #include "lifebook.h"
30 #include "trackpoint.h"
31 #include "touchkit_ps2.h"
32 #include "elantech.h"
33 
34 #define DRIVER_DESC	"PS/2 mouse driver"
35 
36 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
37 MODULE_DESCRIPTION(DRIVER_DESC);
38 MODULE_LICENSE("GPL");
39 
40 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
41 static int psmouse_set_maxproto(const char *val, struct kernel_param *kp);
42 static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp);
43 #define param_check_proto_abbrev(name, p)	__param_check(name, p, unsigned int)
44 #define param_set_proto_abbrev			psmouse_set_maxproto
45 #define param_get_proto_abbrev			psmouse_get_maxproto
46 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
47 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
48 
49 static unsigned int psmouse_resolution = 200;
50 module_param_named(resolution, psmouse_resolution, uint, 0644);
51 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
52 
53 static unsigned int psmouse_rate = 100;
54 module_param_named(rate, psmouse_rate, uint, 0644);
55 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
56 
57 static unsigned int psmouse_smartscroll = 1;
58 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
59 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
60 
61 static unsigned int psmouse_resetafter = 5;
62 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
63 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
64 
65 static unsigned int psmouse_resync_time;
66 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
67 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
68 
69 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
70 			NULL,
71 			psmouse_attr_show_protocol, psmouse_attr_set_protocol);
72 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
73 			(void *) offsetof(struct psmouse, rate),
74 			psmouse_show_int_attr, psmouse_attr_set_rate);
75 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
76 			(void *) offsetof(struct psmouse, resolution),
77 			psmouse_show_int_attr, psmouse_attr_set_resolution);
78 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
79 			(void *) offsetof(struct psmouse, resetafter),
80 			psmouse_show_int_attr, psmouse_set_int_attr);
81 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
82 			(void *) offsetof(struct psmouse, resync_time),
83 			psmouse_show_int_attr, psmouse_set_int_attr);
84 
85 static struct attribute *psmouse_attributes[] = {
86 	&psmouse_attr_protocol.dattr.attr,
87 	&psmouse_attr_rate.dattr.attr,
88 	&psmouse_attr_resolution.dattr.attr,
89 	&psmouse_attr_resetafter.dattr.attr,
90 	&psmouse_attr_resync_time.dattr.attr,
91 	NULL
92 };
93 
94 static struct attribute_group psmouse_attribute_group = {
95 	.attrs	= psmouse_attributes,
96 };
97 
98 /*
99  * psmouse_mutex protects all operations changing state of mouse
100  * (connecting, disconnecting, changing rate or resolution via
101  * sysfs). We could use a per-device semaphore but since there
102  * rarely more than one PS/2 mouse connected and since semaphore
103  * is taken in "slow" paths it is not worth it.
104  */
105 static DEFINE_MUTEX(psmouse_mutex);
106 
107 static struct workqueue_struct *kpsmoused_wq;
108 
109 struct psmouse_protocol {
110 	enum psmouse_type type;
111 	const char *name;
112 	const char *alias;
113 	int maxproto;
114 	int (*detect)(struct psmouse *, int);
115 	int (*init)(struct psmouse *);
116 };
117 
118 /*
119  * psmouse_process_byte() analyzes the PS/2 data stream and reports
120  * relevant events to the input module once full packet has arrived.
121  */
122 
123 static psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
124 {
125 	struct input_dev *dev = psmouse->dev;
126 	unsigned char *packet = psmouse->packet;
127 
128 	if (psmouse->pktcnt < psmouse->pktsize)
129 		return PSMOUSE_GOOD_DATA;
130 
131 /*
132  * Full packet accumulated, process it
133  */
134 
135 /*
136  * Scroll wheel on IntelliMice, scroll buttons on NetMice
137  */
138 
139 	if (psmouse->type == PSMOUSE_IMPS || psmouse->type == PSMOUSE_GENPS)
140 		input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
141 
142 /*
143  * Scroll wheel and buttons on IntelliMouse Explorer
144  */
145 
146 	if (psmouse->type == PSMOUSE_IMEX) {
147 		switch (packet[3] & 0xC0) {
148 			case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
149 				input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
150 				break;
151 			case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
152 				input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
153 				break;
154 			case 0x00:
155 			case 0xC0:
156 				input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
157 				input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
158 				input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
159 				break;
160 		}
161 	}
162 
163 /*
164  * Extra buttons on Genius NewNet 3D
165  */
166 
167 	if (psmouse->type == PSMOUSE_GENPS) {
168 		input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
169 		input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
170 	}
171 
172 /*
173  * Extra button on ThinkingMouse
174  */
175 	if (psmouse->type == PSMOUSE_THINKPS) {
176 		input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
177 		/* Without this bit of weirdness moving up gives wildly high Y changes. */
178 		packet[1] |= (packet[0] & 0x40) << 1;
179 	}
180 
181 /*
182  * Cortron PS2 Trackball reports SIDE button on the 4th bit of the first
183  * byte.
184  */
185 	if (psmouse->type == PSMOUSE_CORTRON) {
186 		input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
187 		packet[0] |= 0x08;
188 	}
189 
190 /*
191  * Generic PS/2 Mouse
192  */
193 
194 	input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
195 	input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
196 	input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);
197 
198 	input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
199 	input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
200 
201 	input_sync(dev);
202 
203 	return PSMOUSE_FULL_PACKET;
204 }
205 
206 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
207 		unsigned long delay)
208 {
209 	queue_delayed_work(kpsmoused_wq, work, delay);
210 }
211 
212 /*
213  * __psmouse_set_state() sets new psmouse state and resets all flags.
214  */
215 
216 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
217 {
218 	psmouse->state = new_state;
219 	psmouse->pktcnt = psmouse->out_of_sync = 0;
220 	psmouse->ps2dev.flags = 0;
221 	psmouse->last = jiffies;
222 }
223 
224 
225 /*
226  * psmouse_set_state() sets new psmouse state and resets all flags and
227  * counters while holding serio lock so fighting with interrupt handler
228  * is not a concern.
229  */
230 
231 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
232 {
233 	serio_pause_rx(psmouse->ps2dev.serio);
234 	__psmouse_set_state(psmouse, new_state);
235 	serio_continue_rx(psmouse->ps2dev.serio);
236 }
237 
238 /*
239  * psmouse_handle_byte() processes one byte of the input data stream
240  * by calling corresponding protocol handler.
241  */
242 
243 static int psmouse_handle_byte(struct psmouse *psmouse)
244 {
245 	psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
246 
247 	switch (rc) {
248 		case PSMOUSE_BAD_DATA:
249 			if (psmouse->state == PSMOUSE_ACTIVATED) {
250 				printk(KERN_WARNING "psmouse.c: %s at %s lost sync at byte %d\n",
251 					psmouse->name, psmouse->phys, psmouse->pktcnt);
252 				if (++psmouse->out_of_sync == psmouse->resetafter) {
253 					__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
254 					printk(KERN_NOTICE "psmouse.c: issuing reconnect request\n");
255 					serio_reconnect(psmouse->ps2dev.serio);
256 					return -1;
257 				}
258 			}
259 			psmouse->pktcnt = 0;
260 			break;
261 
262 		case PSMOUSE_FULL_PACKET:
263 			psmouse->pktcnt = 0;
264 			if (psmouse->out_of_sync) {
265 				psmouse->out_of_sync = 0;
266 				printk(KERN_NOTICE "psmouse.c: %s at %s - driver resynched.\n",
267 					psmouse->name, psmouse->phys);
268 			}
269 			break;
270 
271 		case PSMOUSE_GOOD_DATA:
272 			break;
273 	}
274 	return 0;
275 }
276 
277 /*
278  * psmouse_interrupt() handles incoming characters, either passing them
279  * for normal processing or gathering them as command response.
280  */
281 
282 static irqreturn_t psmouse_interrupt(struct serio *serio,
283 		unsigned char data, unsigned int flags)
284 {
285 	struct psmouse *psmouse = serio_get_drvdata(serio);
286 
287 	if (psmouse->state == PSMOUSE_IGNORE)
288 		goto out;
289 
290 	if (flags & (SERIO_PARITY|SERIO_TIMEOUT)) {
291 		if (psmouse->state == PSMOUSE_ACTIVATED)
292 			printk(KERN_WARNING "psmouse.c: bad data from KBC -%s%s\n",
293 				flags & SERIO_TIMEOUT ? " timeout" : "",
294 				flags & SERIO_PARITY ? " bad parity" : "");
295 		ps2_cmd_aborted(&psmouse->ps2dev);
296 		goto out;
297 	}
298 
299 	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
300 		if  (ps2_handle_ack(&psmouse->ps2dev, data))
301 			goto out;
302 
303 	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
304 		if  (ps2_handle_response(&psmouse->ps2dev, data))
305 			goto out;
306 
307 	if (psmouse->state <= PSMOUSE_RESYNCING)
308 		goto out;
309 
310 	if (psmouse->state == PSMOUSE_ACTIVATED &&
311 	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
312 		printk(KERN_INFO "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
313 		       psmouse->name, psmouse->phys, psmouse->pktcnt);
314 		psmouse->badbyte = psmouse->packet[0];
315 		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
316 		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
317 		goto out;
318 	}
319 
320 	psmouse->packet[psmouse->pktcnt++] = data;
321 /*
322  * Check if this is a new device announcement (0xAA 0x00)
323  */
324 	if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
325 		if (psmouse->pktcnt == 1) {
326 			psmouse->last = jiffies;
327 			goto out;
328 		}
329 
330 		if (psmouse->packet[1] == PSMOUSE_RET_ID) {
331 			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
332 			serio_reconnect(serio);
333 			goto out;
334 		}
335 /*
336  * Not a new device, try processing first byte normally
337  */
338 		psmouse->pktcnt = 1;
339 		if (psmouse_handle_byte(psmouse))
340 			goto out;
341 
342 		psmouse->packet[psmouse->pktcnt++] = data;
343 	}
344 
345 /*
346  * See if we need to force resync because mouse was idle for too long
347  */
348 	if (psmouse->state == PSMOUSE_ACTIVATED &&
349 	    psmouse->pktcnt == 1 && psmouse->resync_time &&
350 	    time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
351 		psmouse->badbyte = psmouse->packet[0];
352 		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
353 		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
354 		goto out;
355 	}
356 
357 	psmouse->last = jiffies;
358 	psmouse_handle_byte(psmouse);
359 
360  out:
361 	return IRQ_HANDLED;
362 }
363 
364 
365 /*
366  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
367  * using sliced syntax, understood by advanced devices, such as Logitech
368  * or Synaptics touchpads. The command is encoded as:
369  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
370  * is the command.
371  */
372 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
373 {
374 	int i;
375 
376 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
377 		return -1;
378 
379 	for (i = 6; i >= 0; i -= 2) {
380 		unsigned char d = (command >> i) & 3;
381 		if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
382 			return -1;
383 	}
384 
385 	return 0;
386 }
387 
388 
389 /*
390  * psmouse_reset() resets the mouse into power-on state.
391  */
392 int psmouse_reset(struct psmouse *psmouse)
393 {
394 	unsigned char param[2];
395 
396 	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
397 		return -1;
398 
399 	if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
400 		return -1;
401 
402 	return 0;
403 }
404 
405 
406 /*
407  * Genius NetMouse magic init.
408  */
409 static int genius_detect(struct psmouse *psmouse, int set_properties)
410 {
411 	struct ps2dev *ps2dev = &psmouse->ps2dev;
412 	unsigned char param[4];
413 
414 	param[0] = 3;
415 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
416 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
417 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
418 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
419 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
420 
421 	if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
422 		return -1;
423 
424 	if (set_properties) {
425 		set_bit(BTN_EXTRA, psmouse->dev->keybit);
426 		set_bit(BTN_SIDE, psmouse->dev->keybit);
427 		set_bit(REL_WHEEL, psmouse->dev->relbit);
428 
429 		psmouse->vendor = "Genius";
430 		psmouse->name = "Mouse";
431 		psmouse->pktsize = 4;
432 	}
433 
434 	return 0;
435 }
436 
437 /*
438  * IntelliMouse magic init.
439  */
440 static int intellimouse_detect(struct psmouse *psmouse, int set_properties)
441 {
442 	struct ps2dev *ps2dev = &psmouse->ps2dev;
443 	unsigned char param[2];
444 
445 	param[0] = 200;
446 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
447 	param[0] = 100;
448 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
449 	param[0] =  80;
450 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
451 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
452 
453 	if (param[0] != 3)
454 		return -1;
455 
456 	if (set_properties) {
457 		set_bit(BTN_MIDDLE, psmouse->dev->keybit);
458 		set_bit(REL_WHEEL, psmouse->dev->relbit);
459 
460 		if (!psmouse->vendor) psmouse->vendor = "Generic";
461 		if (!psmouse->name) psmouse->name = "Wheel Mouse";
462 		psmouse->pktsize = 4;
463 	}
464 
465 	return 0;
466 }
467 
468 /*
469  * Try IntelliMouse/Explorer magic init.
470  */
471 static int im_explorer_detect(struct psmouse *psmouse, int set_properties)
472 {
473 	struct ps2dev *ps2dev = &psmouse->ps2dev;
474 	unsigned char param[2];
475 
476 	intellimouse_detect(psmouse, 0);
477 
478 	param[0] = 200;
479 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
480 	param[0] = 200;
481 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
482 	param[0] =  80;
483 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
484 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
485 
486 	if (param[0] != 4)
487 		return -1;
488 
489 /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
490 	param[0] = 200;
491 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
492 	param[0] =  80;
493 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
494 	param[0] =  40;
495 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
496 
497 	if (set_properties) {
498 		set_bit(BTN_MIDDLE, psmouse->dev->keybit);
499 		set_bit(REL_WHEEL, psmouse->dev->relbit);
500 		set_bit(REL_HWHEEL, psmouse->dev->relbit);
501 		set_bit(BTN_SIDE, psmouse->dev->keybit);
502 		set_bit(BTN_EXTRA, psmouse->dev->keybit);
503 
504 		if (!psmouse->vendor) psmouse->vendor = "Generic";
505 		if (!psmouse->name) psmouse->name = "Explorer Mouse";
506 		psmouse->pktsize = 4;
507 	}
508 
509 	return 0;
510 }
511 
512 /*
513  * Kensington ThinkingMouse / ExpertMouse magic init.
514  */
515 static int thinking_detect(struct psmouse *psmouse, int set_properties)
516 {
517 	struct ps2dev *ps2dev = &psmouse->ps2dev;
518 	unsigned char param[2];
519 	static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
520 	int i;
521 
522 	param[0] = 10;
523 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
524 	param[0] = 0;
525 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
526 	for (i = 0; i < ARRAY_SIZE(seq); i++) {
527 		param[0] = seq[i];
528 		ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
529 	}
530 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
531 
532 	if (param[0] != 2)
533 		return -1;
534 
535 	if (set_properties) {
536 		set_bit(BTN_EXTRA, psmouse->dev->keybit);
537 
538 		psmouse->vendor = "Kensington";
539 		psmouse->name = "ThinkingMouse";
540 	}
541 
542 	return 0;
543 }
544 
545 /*
546  * Bare PS/2 protocol "detection". Always succeeds.
547  */
548 static int ps2bare_detect(struct psmouse *psmouse, int set_properties)
549 {
550 	if (set_properties) {
551 		if (!psmouse->vendor) psmouse->vendor = "Generic";
552 		if (!psmouse->name) psmouse->name = "Mouse";
553 	}
554 
555 	return 0;
556 }
557 
558 /*
559  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
560  * must be forced by sysfs protocol writing.
561  */
562 static int cortron_detect(struct psmouse *psmouse, int set_properties)
563 {
564 	if (set_properties) {
565 		psmouse->vendor = "Cortron";
566 		psmouse->name = "PS/2 Trackball";
567 		set_bit(BTN_SIDE, psmouse->dev->keybit);
568 	}
569 
570 	return 0;
571 }
572 
573 /*
574  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
575  * the mouse may have.
576  */
577 
578 static int psmouse_extensions(struct psmouse *psmouse,
579 			      unsigned int max_proto, int set_properties)
580 {
581 	int synaptics_hardware = 0;
582 
583 /*
584  * We always check for lifebook because it does not disturb mouse
585  * (it only checks DMI information).
586  */
587 	if (lifebook_detect(psmouse, set_properties) == 0) {
588 		if (max_proto > PSMOUSE_IMEX) {
589 			if (!set_properties || lifebook_init(psmouse) == 0)
590 				return PSMOUSE_LIFEBOOK;
591 		}
592 	}
593 
594 /*
595  * Try Kensington ThinkingMouse (we try first, because synaptics probe
596  * upsets the thinkingmouse).
597  */
598 
599 	if (max_proto > PSMOUSE_IMEX && thinking_detect(psmouse, set_properties) == 0)
600 		return PSMOUSE_THINKPS;
601 
602 /*
603  * Try Synaptics TouchPad. Note that probing is done even if Synaptics protocol
604  * support is disabled in config - we need to know if it is synaptics so we
605  * can reset it properly after probing for intellimouse.
606  */
607 	if (max_proto > PSMOUSE_PS2 && synaptics_detect(psmouse, set_properties) == 0) {
608 		synaptics_hardware = 1;
609 
610 		if (max_proto > PSMOUSE_IMEX) {
611 			if (!set_properties || synaptics_init(psmouse) == 0)
612 				return PSMOUSE_SYNAPTICS;
613 /*
614  * Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
615  * Unfortunately Logitech/Genius probes confuse some firmware versions so
616  * we'll have to skip them.
617  */
618 			max_proto = PSMOUSE_IMEX;
619 		}
620 /*
621  * Make sure that touchpad is in relative mode, gestures (taps) are enabled
622  */
623 		synaptics_reset(psmouse);
624 	}
625 
626 /*
627  * Try ALPS TouchPad
628  */
629 	if (max_proto > PSMOUSE_IMEX) {
630 		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
631 		if (alps_detect(psmouse, set_properties) == 0) {
632 			if (!set_properties || alps_init(psmouse) == 0)
633 				return PSMOUSE_ALPS;
634 /*
635  * Init failed, try basic relative protocols
636  */
637 			max_proto = PSMOUSE_IMEX;
638 		}
639 	}
640 
641 /*
642  * Try OLPC HGPK touchpad.
643  */
644 	if (max_proto > PSMOUSE_IMEX &&
645 			hgpk_detect(psmouse, set_properties) == 0) {
646 		if (!set_properties || hgpk_init(psmouse) == 0)
647 			return PSMOUSE_HGPK;
648 /*
649  * Init failed, try basic relative protocols
650  */
651 		max_proto = PSMOUSE_IMEX;
652 	}
653 
654 /*
655  * Try Elantech touchpad.
656  */
657 	if (max_proto > PSMOUSE_IMEX &&
658 			elantech_detect(psmouse, set_properties) == 0) {
659 		if (!set_properties || elantech_init(psmouse) == 0)
660 			return PSMOUSE_ELANTECH;
661 /*
662  * Init failed, try basic relative protocols
663  */
664 		max_proto = PSMOUSE_IMEX;
665 	}
666 
667 	if (max_proto > PSMOUSE_IMEX) {
668 		if (genius_detect(psmouse, set_properties) == 0)
669 			return PSMOUSE_GENPS;
670 
671 		if (ps2pp_init(psmouse, set_properties) == 0)
672 			return PSMOUSE_PS2PP;
673 
674 		if (trackpoint_detect(psmouse, set_properties) == 0)
675 			return PSMOUSE_TRACKPOINT;
676 
677 		if (touchkit_ps2_detect(psmouse, set_properties) == 0)
678 			return PSMOUSE_TOUCHKIT_PS2;
679 	}
680 
681 /*
682  * Reset to defaults in case the device got confused by extended
683  * protocol probes. Note that we follow up with full reset because
684  * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
685  */
686 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
687 	psmouse_reset(psmouse);
688 
689 	if (max_proto >= PSMOUSE_IMEX && im_explorer_detect(psmouse, set_properties) == 0)
690 		return PSMOUSE_IMEX;
691 
692 	if (max_proto >= PSMOUSE_IMPS && intellimouse_detect(psmouse, set_properties) == 0)
693 		return PSMOUSE_IMPS;
694 
695 /*
696  * Okay, all failed, we have a standard mouse here. The number of the buttons
697  * is still a question, though. We assume 3.
698  */
699 	ps2bare_detect(psmouse, set_properties);
700 
701 	if (synaptics_hardware) {
702 /*
703  * We detected Synaptics hardware but it did not respond to IMPS/2 probes.
704  * We need to reset the touchpad because if there is a track point on the
705  * pass through port it could get disabled while probing for protocol
706  * extensions.
707  */
708 		psmouse_reset(psmouse);
709 	}
710 
711 	return PSMOUSE_PS2;
712 }
713 
714 static const struct psmouse_protocol psmouse_protocols[] = {
715 	{
716 		.type		= PSMOUSE_PS2,
717 		.name		= "PS/2",
718 		.alias		= "bare",
719 		.maxproto	= 1,
720 		.detect		= ps2bare_detect,
721 	},
722 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
723 	{
724 		.type		= PSMOUSE_PS2PP,
725 		.name		= "PS2++",
726 		.alias		= "logitech",
727 		.detect		= ps2pp_init,
728 	},
729 #endif
730 	{
731 		.type		= PSMOUSE_THINKPS,
732 		.name		= "ThinkPS/2",
733 		.alias		= "thinkps",
734 		.detect		= thinking_detect,
735 	},
736 	{
737 		.type		= PSMOUSE_GENPS,
738 		.name		= "GenPS/2",
739 		.alias		= "genius",
740 		.detect		= genius_detect,
741 	},
742 	{
743 		.type		= PSMOUSE_IMPS,
744 		.name		= "ImPS/2",
745 		.alias		= "imps",
746 		.maxproto	= 1,
747 		.detect		= intellimouse_detect,
748 	},
749 	{
750 		.type		= PSMOUSE_IMEX,
751 		.name		= "ImExPS/2",
752 		.alias		= "exps",
753 		.maxproto	= 1,
754 		.detect		= im_explorer_detect,
755 	},
756 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
757 	{
758 		.type		= PSMOUSE_SYNAPTICS,
759 		.name		= "SynPS/2",
760 		.alias		= "synaptics",
761 		.detect		= synaptics_detect,
762 		.init		= synaptics_init,
763 	},
764 #endif
765 #ifdef CONFIG_MOUSE_PS2_ALPS
766 	{
767 		.type		= PSMOUSE_ALPS,
768 		.name		= "AlpsPS/2",
769 		.alias		= "alps",
770 		.detect		= alps_detect,
771 		.init		= alps_init,
772 	},
773 #endif
774 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
775 	{
776 		.type		= PSMOUSE_LIFEBOOK,
777 		.name		= "LBPS/2",
778 		.alias		= "lifebook",
779 		.init		= lifebook_init,
780 	},
781 #endif
782 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
783 	{
784 		.type		= PSMOUSE_TRACKPOINT,
785 		.name		= "TPPS/2",
786 		.alias		= "trackpoint",
787 		.detect		= trackpoint_detect,
788 	},
789 #endif
790 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
791 	{
792 		.type		= PSMOUSE_TOUCHKIT_PS2,
793 		.name		= "touchkitPS/2",
794 		.alias		= "touchkit",
795 		.detect		= touchkit_ps2_detect,
796 	},
797 #endif
798 #ifdef CONFIG_MOUSE_PS2_OLPC
799 	{
800 		.type		= PSMOUSE_HGPK,
801 		.name		= "OLPC HGPK",
802 		.alias		= "hgpk",
803 		.detect		= hgpk_detect,
804 	},
805 #endif
806 #ifdef CONFIG_MOUSE_PS2_ELANTECH
807 	{
808 		.type		= PSMOUSE_ELANTECH,
809 		.name		= "ETPS/2",
810 		.alias		= "elantech",
811 		.detect		= elantech_detect,
812 		.init		= elantech_init,
813 	},
814  #endif
815 	{
816 		.type		= PSMOUSE_CORTRON,
817 		.name		= "CortronPS/2",
818 		.alias		= "cortps",
819 		.detect		= cortron_detect,
820 	},
821 	{
822 		.type		= PSMOUSE_AUTO,
823 		.name		= "auto",
824 		.alias		= "any",
825 		.maxproto	= 1,
826 	},
827 };
828 
829 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
830 {
831 	int i;
832 
833 	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
834 		if (psmouse_protocols[i].type == type)
835 			return &psmouse_protocols[i];
836 
837 	WARN_ON(1);
838 	return &psmouse_protocols[0];
839 }
840 
841 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
842 {
843 	const struct psmouse_protocol *p;
844 	int i;
845 
846 	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
847 		p = &psmouse_protocols[i];
848 
849 		if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
850 		    (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
851 			return &psmouse_protocols[i];
852 	}
853 
854 	return NULL;
855 }
856 
857 
858 /*
859  * psmouse_probe() probes for a PS/2 mouse.
860  */
861 
862 static int psmouse_probe(struct psmouse *psmouse)
863 {
864 	struct ps2dev *ps2dev = &psmouse->ps2dev;
865 	unsigned char param[2];
866 
867 /*
868  * First, we check if it's a mouse. It should send 0x00 or 0x03
869  * in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
870  * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and subsequent
871  * ID queries, probably due to a firmware bug.
872  */
873 
874 	param[0] = 0xa5;
875 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
876 		return -1;
877 
878 	if (param[0] != 0x00 && param[0] != 0x03 &&
879 	    param[0] != 0x04 && param[0] != 0xff)
880 		return -1;
881 
882 /*
883  * Then we reset and disable the mouse so that it doesn't generate events.
884  */
885 
886 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
887 		printk(KERN_WARNING "psmouse.c: Failed to reset mouse on %s\n", ps2dev->serio->phys);
888 
889 	return 0;
890 }
891 
892 /*
893  * Here we set the mouse resolution.
894  */
895 
896 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
897 {
898 	static const unsigned char params[] = { 0, 1, 2, 2, 3 };
899 	unsigned char p;
900 
901 	if (resolution == 0 || resolution > 200)
902 		resolution = 200;
903 
904 	p = params[resolution / 50];
905 	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
906 	psmouse->resolution = 25 << p;
907 }
908 
909 /*
910  * Here we set the mouse report rate.
911  */
912 
913 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
914 {
915 	static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
916 	unsigned char r;
917 	int i = 0;
918 
919 	while (rates[i] > rate) i++;
920 	r = rates[i];
921 	ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
922 	psmouse->rate = r;
923 }
924 
925 /*
926  * psmouse_initialize() initializes the mouse to a sane state.
927  */
928 
929 static void psmouse_initialize(struct psmouse *psmouse)
930 {
931 /*
932  * We set the mouse report rate, resolution and scaling.
933  */
934 
935 	if (psmouse_max_proto != PSMOUSE_PS2) {
936 		psmouse->set_rate(psmouse, psmouse->rate);
937 		psmouse->set_resolution(psmouse, psmouse->resolution);
938 		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
939 	}
940 }
941 
942 /*
943  * psmouse_activate() enables the mouse so that we get motion reports from it.
944  */
945 
946 static void psmouse_activate(struct psmouse *psmouse)
947 {
948 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE))
949 		printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n",
950 			psmouse->ps2dev.serio->phys);
951 
952 	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
953 }
954 
955 
956 /*
957  * psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
958  * reports from it unless we explicitly request it.
959  */
960 
961 static void psmouse_deactivate(struct psmouse *psmouse)
962 {
963 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
964 		printk(KERN_WARNING "psmouse.c: Failed to deactivate mouse on %s\n",
965 			psmouse->ps2dev.serio->phys);
966 
967 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
968 }
969 
970 /*
971  * psmouse_poll() - default poll hanlder. Everyone except for ALPS uses it.
972  */
973 
974 static int psmouse_poll(struct psmouse *psmouse)
975 {
976 	return ps2_command(&psmouse->ps2dev, psmouse->packet,
977 			   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
978 }
979 
980 
981 /*
982  * psmouse_resync() attempts to re-validate current protocol.
983  */
984 
985 static void psmouse_resync(struct work_struct *work)
986 {
987 	struct psmouse *parent = NULL, *psmouse =
988 		container_of(work, struct psmouse, resync_work.work);
989 	struct serio *serio = psmouse->ps2dev.serio;
990 	psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
991 	int failed = 0, enabled = 0;
992 	int i;
993 
994 	mutex_lock(&psmouse_mutex);
995 
996 	if (psmouse->state != PSMOUSE_RESYNCING)
997 		goto out;
998 
999 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1000 		parent = serio_get_drvdata(serio->parent);
1001 		psmouse_deactivate(parent);
1002 	}
1003 
1004 /*
1005  * Some mice don't ACK commands sent while they are in the middle of
1006  * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1007  * instead of ps2_command() which would wait for 200ms for an ACK
1008  * that may never come.
1009  * As an additional quirk ALPS touchpads may not only forget to ACK
1010  * disable command but will stop reporting taps, so if we see that
1011  * mouse at least once ACKs disable we will do full reconnect if ACK
1012  * is missing.
1013  */
1014 	psmouse->num_resyncs++;
1015 
1016 	if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1017 		if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1018 			failed = 1;
1019 	} else
1020 		psmouse->acks_disable_command = 1;
1021 
1022 /*
1023  * Poll the mouse. If it was reset the packet will be shorter than
1024  * psmouse->pktsize and ps2_command will fail. We do not expect and
1025  * do not handle scenario when mouse "upgrades" its protocol while
1026  * disconnected since it would require additional delay. If we ever
1027  * see a mouse that does it we'll adjust the code.
1028  */
1029 	if (!failed) {
1030 		if (psmouse->poll(psmouse))
1031 			failed = 1;
1032 		else {
1033 			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1034 			for (i = 0; i < psmouse->pktsize; i++) {
1035 				psmouse->pktcnt++;
1036 				rc = psmouse->protocol_handler(psmouse);
1037 				if (rc != PSMOUSE_GOOD_DATA)
1038 					break;
1039 			}
1040 			if (rc != PSMOUSE_FULL_PACKET)
1041 				failed = 1;
1042 			psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1043 		}
1044 	}
1045 /*
1046  * Now try to enable mouse. We try to do that even if poll failed and also
1047  * repeat our attempts 5 times, otherwise we may be left out with disabled
1048  * mouse.
1049  */
1050 	for (i = 0; i < 5; i++) {
1051 		if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1052 			enabled = 1;
1053 			break;
1054 		}
1055 		msleep(200);
1056 	}
1057 
1058 	if (!enabled) {
1059 		printk(KERN_WARNING "psmouse.c: failed to re-enable mouse on %s\n",
1060 			psmouse->ps2dev.serio->phys);
1061 		failed = 1;
1062 	}
1063 
1064 	if (failed) {
1065 		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1066 		printk(KERN_INFO "psmouse.c: resync failed, issuing reconnect request\n");
1067 		serio_reconnect(serio);
1068 	} else
1069 		psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1070 
1071 	if (parent)
1072 		psmouse_activate(parent);
1073  out:
1074 	mutex_unlock(&psmouse_mutex);
1075 }
1076 
1077 /*
1078  * psmouse_cleanup() resets the mouse into power-on state.
1079  */
1080 
1081 static void psmouse_cleanup(struct serio *serio)
1082 {
1083 	struct psmouse *psmouse = serio_get_drvdata(serio);
1084 	struct psmouse *parent = NULL;
1085 
1086 	mutex_lock(&psmouse_mutex);
1087 
1088 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1089 		parent = serio_get_drvdata(serio->parent);
1090 		psmouse_deactivate(parent);
1091 	}
1092 
1093 	psmouse_deactivate(psmouse);
1094 
1095 	if (psmouse->cleanup)
1096 		psmouse->cleanup(psmouse);
1097 
1098 	psmouse_reset(psmouse);
1099 
1100 /*
1101  * Some boxes, such as HP nx7400, get terribly confused if mouse
1102  * is not fully enabled before suspending/shutting down.
1103  */
1104 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1105 
1106 	if (parent) {
1107 		if (parent->pt_deactivate)
1108 			parent->pt_deactivate(parent);
1109 
1110 		psmouse_activate(parent);
1111 	}
1112 
1113 	mutex_unlock(&psmouse_mutex);
1114 }
1115 
1116 /*
1117  * psmouse_disconnect() closes and frees.
1118  */
1119 
1120 static void psmouse_disconnect(struct serio *serio)
1121 {
1122 	struct psmouse *psmouse, *parent = NULL;
1123 
1124 	psmouse = serio_get_drvdata(serio);
1125 
1126 	sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1127 
1128 	mutex_lock(&psmouse_mutex);
1129 
1130 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1131 
1132 	/* make sure we don't have a resync in progress */
1133 	mutex_unlock(&psmouse_mutex);
1134 	flush_workqueue(kpsmoused_wq);
1135 	mutex_lock(&psmouse_mutex);
1136 
1137 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1138 		parent = serio_get_drvdata(serio->parent);
1139 		psmouse_deactivate(parent);
1140 	}
1141 
1142 	if (psmouse->disconnect)
1143 		psmouse->disconnect(psmouse);
1144 
1145 	if (parent && parent->pt_deactivate)
1146 		parent->pt_deactivate(parent);
1147 
1148 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1149 
1150 	serio_close(serio);
1151 	serio_set_drvdata(serio, NULL);
1152 	input_unregister_device(psmouse->dev);
1153 	kfree(psmouse);
1154 
1155 	if (parent)
1156 		psmouse_activate(parent);
1157 
1158 	mutex_unlock(&psmouse_mutex);
1159 }
1160 
1161 static int psmouse_switch_protocol(struct psmouse *psmouse, const struct psmouse_protocol *proto)
1162 {
1163 	struct input_dev *input_dev = psmouse->dev;
1164 
1165 	input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1166 
1167 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
1168 	input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
1169 		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
1170 	input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
1171 
1172 	psmouse->set_rate = psmouse_set_rate;
1173 	psmouse->set_resolution = psmouse_set_resolution;
1174 	psmouse->poll = psmouse_poll;
1175 	psmouse->protocol_handler = psmouse_process_byte;
1176 	psmouse->pktsize = 3;
1177 
1178 	if (proto && (proto->detect || proto->init)) {
1179 		if (proto->detect && proto->detect(psmouse, 1) < 0)
1180 			return -1;
1181 
1182 		if (proto->init && proto->init(psmouse) < 0)
1183 			return -1;
1184 
1185 		psmouse->type = proto->type;
1186 	}
1187 	else
1188 		psmouse->type = psmouse_extensions(psmouse, psmouse_max_proto, 1);
1189 
1190 	/*
1191 	 * If mouse's packet size is 3 there is no point in polling the
1192 	 * device in hopes to detect protocol reset - we won't get less
1193 	 * than 3 bytes response anyhow.
1194 	 */
1195 	if (psmouse->pktsize == 3)
1196 		psmouse->resync_time = 0;
1197 
1198 	/*
1199 	 * Some smart KVMs fake response to POLL command returning just
1200 	 * 3 bytes and messing up our resync logic, so if initial poll
1201 	 * fails we won't try polling the device anymore. Hopefully
1202 	 * such KVM will maintain initially selected protocol.
1203 	 */
1204 	if (psmouse->resync_time && psmouse->poll(psmouse))
1205 		psmouse->resync_time = 0;
1206 
1207 	snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1208 		 psmouse_protocol_by_type(psmouse->type)->name, psmouse->vendor, psmouse->name);
1209 
1210 	input_dev->name = psmouse->devname;
1211 	input_dev->phys = psmouse->phys;
1212 	input_dev->id.bustype = BUS_I8042;
1213 	input_dev->id.vendor = 0x0002;
1214 	input_dev->id.product = psmouse->type;
1215 	input_dev->id.version = psmouse->model;
1216 
1217 	return 0;
1218 }
1219 
1220 /*
1221  * psmouse_connect() is a callback from the serio module when
1222  * an unhandled serio port is found.
1223  */
1224 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1225 {
1226 	struct psmouse *psmouse, *parent = NULL;
1227 	struct input_dev *input_dev;
1228 	int retval = 0, error = -ENOMEM;
1229 
1230 	mutex_lock(&psmouse_mutex);
1231 
1232 	/*
1233 	 * If this is a pass-through port deactivate parent so the device
1234 	 * connected to this port can be successfully identified
1235 	 */
1236 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1237 		parent = serio_get_drvdata(serio->parent);
1238 		psmouse_deactivate(parent);
1239 	}
1240 
1241 	psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1242 	input_dev = input_allocate_device();
1243 	if (!psmouse || !input_dev)
1244 		goto err_free;
1245 
1246 	ps2_init(&psmouse->ps2dev, serio);
1247 	INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1248 	psmouse->dev = input_dev;
1249 	snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1250 
1251 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1252 
1253 	serio_set_drvdata(serio, psmouse);
1254 
1255 	error = serio_open(serio, drv);
1256 	if (error)
1257 		goto err_clear_drvdata;
1258 
1259 	if (psmouse_probe(psmouse) < 0) {
1260 		error = -ENODEV;
1261 		goto err_close_serio;
1262 	}
1263 
1264 	psmouse->rate = psmouse_rate;
1265 	psmouse->resolution = psmouse_resolution;
1266 	psmouse->resetafter = psmouse_resetafter;
1267 	psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1268 	psmouse->smartscroll = psmouse_smartscroll;
1269 
1270 	psmouse_switch_protocol(psmouse, NULL);
1271 
1272 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1273 	psmouse_initialize(psmouse);
1274 
1275 	error = input_register_device(psmouse->dev);
1276 	if (error)
1277 		goto err_protocol_disconnect;
1278 
1279 	if (parent && parent->pt_activate)
1280 		parent->pt_activate(parent);
1281 
1282 	error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1283 	if (error)
1284 		goto err_pt_deactivate;
1285 
1286 	psmouse_activate(psmouse);
1287 
1288  out:
1289 	/* If this is a pass-through port the parent needs to be re-activated */
1290 	if (parent)
1291 		psmouse_activate(parent);
1292 
1293 	mutex_unlock(&psmouse_mutex);
1294 	return retval;
1295 
1296  err_pt_deactivate:
1297 	if (parent && parent->pt_deactivate)
1298 		parent->pt_deactivate(parent);
1299 	input_unregister_device(psmouse->dev);
1300 	input_dev = NULL; /* so we don't try to free it below */
1301  err_protocol_disconnect:
1302 	if (psmouse->disconnect)
1303 		psmouse->disconnect(psmouse);
1304 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1305  err_close_serio:
1306 	serio_close(serio);
1307  err_clear_drvdata:
1308 	serio_set_drvdata(serio, NULL);
1309  err_free:
1310 	input_free_device(input_dev);
1311 	kfree(psmouse);
1312 
1313 	retval = error;
1314 	goto out;
1315 }
1316 
1317 
1318 static int psmouse_reconnect(struct serio *serio)
1319 {
1320 	struct psmouse *psmouse = serio_get_drvdata(serio);
1321 	struct psmouse *parent = NULL;
1322 	struct serio_driver *drv = serio->drv;
1323 	int rc = -1;
1324 
1325 	if (!drv || !psmouse) {
1326 		printk(KERN_DEBUG "psmouse: reconnect request, but serio is disconnected, ignoring...\n");
1327 		return -1;
1328 	}
1329 
1330 	mutex_lock(&psmouse_mutex);
1331 
1332 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1333 		parent = serio_get_drvdata(serio->parent);
1334 		psmouse_deactivate(parent);
1335 	}
1336 
1337 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1338 
1339 	if (psmouse->reconnect) {
1340 		if (psmouse->reconnect(psmouse))
1341 			goto out;
1342 	} else if (psmouse_probe(psmouse) < 0 ||
1343 		   psmouse->type != psmouse_extensions(psmouse, psmouse_max_proto, 0))
1344 		goto out;
1345 
1346 	/* ok, the device type (and capabilities) match the old one,
1347 	 * we can continue using it, complete intialization
1348 	 */
1349 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1350 
1351 	psmouse_initialize(psmouse);
1352 
1353 	if (parent && parent->pt_activate)
1354 		parent->pt_activate(parent);
1355 
1356 	psmouse_activate(psmouse);
1357 	rc = 0;
1358 
1359 out:
1360 	/* If this is a pass-through port the parent waits to be activated */
1361 	if (parent)
1362 		psmouse_activate(parent);
1363 
1364 	mutex_unlock(&psmouse_mutex);
1365 	return rc;
1366 }
1367 
1368 static struct serio_device_id psmouse_serio_ids[] = {
1369 	{
1370 		.type	= SERIO_8042,
1371 		.proto	= SERIO_ANY,
1372 		.id	= SERIO_ANY,
1373 		.extra	= SERIO_ANY,
1374 	},
1375 	{
1376 		.type	= SERIO_PS_PSTHRU,
1377 		.proto	= SERIO_ANY,
1378 		.id	= SERIO_ANY,
1379 		.extra	= SERIO_ANY,
1380 	},
1381 	{ 0 }
1382 };
1383 
1384 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1385 
1386 static struct serio_driver psmouse_drv = {
1387 	.driver		= {
1388 		.name	= "psmouse",
1389 	},
1390 	.description	= DRIVER_DESC,
1391 	.id_table	= psmouse_serio_ids,
1392 	.interrupt	= psmouse_interrupt,
1393 	.connect	= psmouse_connect,
1394 	.reconnect	= psmouse_reconnect,
1395 	.disconnect	= psmouse_disconnect,
1396 	.cleanup	= psmouse_cleanup,
1397 };
1398 
1399 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1400 				 char *buf)
1401 {
1402 	struct serio *serio = to_serio_port(dev);
1403 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1404 	struct psmouse *psmouse;
1405 	int retval;
1406 
1407 	retval = serio_pin_driver(serio);
1408 	if (retval)
1409 		return retval;
1410 
1411 	if (serio->drv != &psmouse_drv) {
1412 		retval = -ENODEV;
1413 		goto out;
1414 	}
1415 
1416 	psmouse = serio_get_drvdata(serio);
1417 
1418 	retval = attr->show(psmouse, attr->data, buf);
1419 
1420 out:
1421 	serio_unpin_driver(serio);
1422 	return retval;
1423 }
1424 
1425 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1426 				const char *buf, size_t count)
1427 {
1428 	struct serio *serio = to_serio_port(dev);
1429 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1430 	struct psmouse *psmouse, *parent = NULL;
1431 	int retval;
1432 
1433 	retval = serio_pin_driver(serio);
1434 	if (retval)
1435 		return retval;
1436 
1437 	if (serio->drv != &psmouse_drv) {
1438 		retval = -ENODEV;
1439 		goto out_unpin;
1440 	}
1441 
1442 	retval = mutex_lock_interruptible(&psmouse_mutex);
1443 	if (retval)
1444 		goto out_unpin;
1445 
1446 	psmouse = serio_get_drvdata(serio);
1447 
1448 	if (attr->protect) {
1449 		if (psmouse->state == PSMOUSE_IGNORE) {
1450 			retval = -ENODEV;
1451 			goto out_unlock;
1452 		}
1453 
1454 		if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1455 			parent = serio_get_drvdata(serio->parent);
1456 			psmouse_deactivate(parent);
1457 		}
1458 
1459 		psmouse_deactivate(psmouse);
1460 	}
1461 
1462 	retval = attr->set(psmouse, attr->data, buf, count);
1463 
1464 	if (attr->protect) {
1465 		if (retval != -ENODEV)
1466 			psmouse_activate(psmouse);
1467 
1468 		if (parent)
1469 			psmouse_activate(parent);
1470 	}
1471 
1472  out_unlock:
1473 	mutex_unlock(&psmouse_mutex);
1474  out_unpin:
1475 	serio_unpin_driver(serio);
1476 	return retval;
1477 }
1478 
1479 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1480 {
1481 	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1482 
1483 	return sprintf(buf, "%u\n", *field);
1484 }
1485 
1486 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1487 {
1488 	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1489 	unsigned long value;
1490 
1491 	if (strict_strtoul(buf, 10, &value))
1492 		return -EINVAL;
1493 
1494 	if ((unsigned int)value != value)
1495 		return -EINVAL;
1496 
1497 	*field = value;
1498 
1499 	return count;
1500 }
1501 
1502 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1503 {
1504 	return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
1505 }
1506 
1507 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1508 {
1509 	struct serio *serio = psmouse->ps2dev.serio;
1510 	struct psmouse *parent = NULL;
1511 	struct input_dev *old_dev, *new_dev;
1512 	const struct psmouse_protocol *proto, *old_proto;
1513 	int error;
1514 	int retry = 0;
1515 
1516 	proto = psmouse_protocol_by_name(buf, count);
1517 	if (!proto)
1518 		return -EINVAL;
1519 
1520 	if (psmouse->type == proto->type)
1521 		return count;
1522 
1523 	new_dev = input_allocate_device();
1524 	if (!new_dev)
1525 		return -ENOMEM;
1526 
1527 	while (serio->child) {
1528 		if (++retry > 3) {
1529 			printk(KERN_WARNING "psmouse: failed to destroy child port, protocol change aborted.\n");
1530 			input_free_device(new_dev);
1531 			return -EIO;
1532 		}
1533 
1534 		mutex_unlock(&psmouse_mutex);
1535 		serio_unpin_driver(serio);
1536 		serio_unregister_child_port(serio);
1537 		serio_pin_driver_uninterruptible(serio);
1538 		mutex_lock(&psmouse_mutex);
1539 
1540 		if (serio->drv != &psmouse_drv) {
1541 			input_free_device(new_dev);
1542 			return -ENODEV;
1543 		}
1544 
1545 		if (psmouse->type == proto->type) {
1546 			input_free_device(new_dev);
1547 			return count; /* switched by other thread */
1548 		}
1549 	}
1550 
1551 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1552 		parent = serio_get_drvdata(serio->parent);
1553 		if (parent->pt_deactivate)
1554 			parent->pt_deactivate(parent);
1555 	}
1556 
1557 	old_dev = psmouse->dev;
1558 	old_proto = psmouse_protocol_by_type(psmouse->type);
1559 
1560 	if (psmouse->disconnect)
1561 		psmouse->disconnect(psmouse);
1562 
1563 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1564 
1565 	psmouse->dev = new_dev;
1566 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1567 
1568 	if (psmouse_switch_protocol(psmouse, proto) < 0) {
1569 		psmouse_reset(psmouse);
1570 		/* default to PSMOUSE_PS2 */
1571 		psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1572 	}
1573 
1574 	psmouse_initialize(psmouse);
1575 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1576 
1577 	error = input_register_device(psmouse->dev);
1578 	if (error) {
1579 		if (psmouse->disconnect)
1580 			psmouse->disconnect(psmouse);
1581 
1582 		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1583 		input_free_device(new_dev);
1584 		psmouse->dev = old_dev;
1585 		psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1586 		psmouse_switch_protocol(psmouse, old_proto);
1587 		psmouse_initialize(psmouse);
1588 		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1589 
1590 		return error;
1591 	}
1592 
1593 	input_unregister_device(old_dev);
1594 
1595 	if (parent && parent->pt_activate)
1596 		parent->pt_activate(parent);
1597 
1598 	return count;
1599 }
1600 
1601 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1602 {
1603 	unsigned long value;
1604 
1605 	if (strict_strtoul(buf, 10, &value))
1606 		return -EINVAL;
1607 
1608 	psmouse->set_rate(psmouse, value);
1609 	return count;
1610 }
1611 
1612 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1613 {
1614 	unsigned long value;
1615 
1616 	if (strict_strtoul(buf, 10, &value))
1617 		return -EINVAL;
1618 
1619 	psmouse->set_resolution(psmouse, value);
1620 	return count;
1621 }
1622 
1623 
1624 static int psmouse_set_maxproto(const char *val, struct kernel_param *kp)
1625 {
1626 	const struct psmouse_protocol *proto;
1627 
1628 	if (!val)
1629 		return -EINVAL;
1630 
1631 	proto = psmouse_protocol_by_name(val, strlen(val));
1632 
1633 	if (!proto || !proto->maxproto)
1634 		return -EINVAL;
1635 
1636 	*((unsigned int *)kp->arg) = proto->type;
1637 
1638 	return 0;
1639 }
1640 
1641 static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp)
1642 {
1643 	int type = *((unsigned int *)kp->arg);
1644 
1645 	return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
1646 }
1647 
1648 static int __init psmouse_init(void)
1649 {
1650 	int err;
1651 
1652 	kpsmoused_wq = create_singlethread_workqueue("kpsmoused");
1653 	if (!kpsmoused_wq) {
1654 		printk(KERN_ERR "psmouse: failed to create kpsmoused workqueue\n");
1655 		return -ENOMEM;
1656 	}
1657 
1658 	err = serio_register_driver(&psmouse_drv);
1659 	if (err)
1660 		destroy_workqueue(kpsmoused_wq);
1661 
1662 	return err;
1663 }
1664 
1665 static void __exit psmouse_exit(void)
1666 {
1667 	serio_unregister_driver(&psmouse_drv);
1668 	destroy_workqueue(kpsmoused_wq);
1669 }
1670 
1671 module_init(psmouse_init);
1672 module_exit(psmouse_exit);
1673