xref: /linux/drivers/input/mouse/psmouse-base.c (revision 913df4453f85f1fe79b35ecf3c9a0c0b707d22a2)
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 #include "sentelic.h"
34 
35 #define DRIVER_DESC	"PS/2 mouse driver"
36 
37 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
38 MODULE_DESCRIPTION(DRIVER_DESC);
39 MODULE_LICENSE("GPL");
40 
41 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
42 static int psmouse_set_maxproto(const char *val, struct kernel_param *kp);
43 static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp);
44 #define param_check_proto_abbrev(name, p)	__param_check(name, p, unsigned int)
45 #define param_set_proto_abbrev			psmouse_set_maxproto
46 #define param_get_proto_abbrev			psmouse_get_maxproto
47 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
48 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
49 
50 static unsigned int psmouse_resolution = 200;
51 module_param_named(resolution, psmouse_resolution, uint, 0644);
52 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
53 
54 static unsigned int psmouse_rate = 100;
55 module_param_named(rate, psmouse_rate, uint, 0644);
56 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
57 
58 static unsigned int psmouse_smartscroll = 1;
59 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
60 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
61 
62 static unsigned int psmouse_resetafter = 5;
63 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
64 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
65 
66 static unsigned int psmouse_resync_time;
67 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
68 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
69 
70 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
71 			NULL,
72 			psmouse_attr_show_protocol, psmouse_attr_set_protocol);
73 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
74 			(void *) offsetof(struct psmouse, rate),
75 			psmouse_show_int_attr, psmouse_attr_set_rate);
76 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
77 			(void *) offsetof(struct psmouse, resolution),
78 			psmouse_show_int_attr, psmouse_attr_set_resolution);
79 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
80 			(void *) offsetof(struct psmouse, resetafter),
81 			psmouse_show_int_attr, psmouse_set_int_attr);
82 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
83 			(void *) offsetof(struct psmouse, resync_time),
84 			psmouse_show_int_attr, psmouse_set_int_attr);
85 
86 static struct attribute *psmouse_attributes[] = {
87 	&psmouse_attr_protocol.dattr.attr,
88 	&psmouse_attr_rate.dattr.attr,
89 	&psmouse_attr_resolution.dattr.attr,
90 	&psmouse_attr_resetafter.dattr.attr,
91 	&psmouse_attr_resync_time.dattr.attr,
92 	NULL
93 };
94 
95 static struct attribute_group psmouse_attribute_group = {
96 	.attrs	= psmouse_attributes,
97 };
98 
99 /*
100  * psmouse_mutex protects all operations changing state of mouse
101  * (connecting, disconnecting, changing rate or resolution via
102  * sysfs). We could use a per-device semaphore but since there
103  * rarely more than one PS/2 mouse connected and since semaphore
104  * is taken in "slow" paths it is not worth it.
105  */
106 static DEFINE_MUTEX(psmouse_mutex);
107 
108 static struct workqueue_struct *kpsmoused_wq;
109 
110 struct psmouse_protocol {
111 	enum psmouse_type type;
112 	bool maxproto;
113 	const char *name;
114 	const char *alias;
115 	int (*detect)(struct psmouse *, bool);
116 	int (*init)(struct psmouse *);
117 };
118 
119 /*
120  * psmouse_process_byte() analyzes the PS/2 data stream and reports
121  * relevant events to the input module once full packet has arrived.
122  */
123 
124 static psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
125 {
126 	struct input_dev *dev = psmouse->dev;
127 	unsigned char *packet = psmouse->packet;
128 
129 	if (psmouse->pktcnt < psmouse->pktsize)
130 		return PSMOUSE_GOOD_DATA;
131 
132 /*
133  * Full packet accumulated, process it
134  */
135 
136 /*
137  * Scroll wheel on IntelliMice, scroll buttons on NetMice
138  */
139 
140 	if (psmouse->type == PSMOUSE_IMPS || psmouse->type == PSMOUSE_GENPS)
141 		input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
142 
143 /*
144  * Scroll wheel and buttons on IntelliMouse Explorer
145  */
146 
147 	if (psmouse->type == PSMOUSE_IMEX) {
148 		switch (packet[3] & 0xC0) {
149 			case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
150 				input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
151 				break;
152 			case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
153 				input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
154 				break;
155 			case 0x00:
156 			case 0xC0:
157 				input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
158 				input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
159 				input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
160 				break;
161 		}
162 	}
163 
164 /*
165  * Extra buttons on Genius NewNet 3D
166  */
167 
168 	if (psmouse->type == PSMOUSE_GENPS) {
169 		input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
170 		input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
171 	}
172 
173 /*
174  * Extra button on ThinkingMouse
175  */
176 	if (psmouse->type == PSMOUSE_THINKPS) {
177 		input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
178 		/* Without this bit of weirdness moving up gives wildly high Y changes. */
179 		packet[1] |= (packet[0] & 0x40) << 1;
180 	}
181 
182 /*
183  * Cortron PS2 Trackball reports SIDE button on the 4th bit of the first
184  * byte.
185  */
186 	if (psmouse->type == PSMOUSE_CORTRON) {
187 		input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
188 		packet[0] |= 0x08;
189 	}
190 
191 /*
192  * Generic PS/2 Mouse
193  */
194 
195 	input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
196 	input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
197 	input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);
198 
199 	input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
200 	input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
201 
202 	input_sync(dev);
203 
204 	return PSMOUSE_FULL_PACKET;
205 }
206 
207 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
208 		unsigned long delay)
209 {
210 	queue_delayed_work(kpsmoused_wq, work, delay);
211 }
212 
213 /*
214  * __psmouse_set_state() sets new psmouse state and resets all flags.
215  */
216 
217 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
218 {
219 	psmouse->state = new_state;
220 	psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
221 	psmouse->ps2dev.flags = 0;
222 	psmouse->last = jiffies;
223 }
224 
225 
226 /*
227  * psmouse_set_state() sets new psmouse state and resets all flags and
228  * counters while holding serio lock so fighting with interrupt handler
229  * is not a concern.
230  */
231 
232 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
233 {
234 	serio_pause_rx(psmouse->ps2dev.serio);
235 	__psmouse_set_state(psmouse, new_state);
236 	serio_continue_rx(psmouse->ps2dev.serio);
237 }
238 
239 /*
240  * psmouse_handle_byte() processes one byte of the input data stream
241  * by calling corresponding protocol handler.
242  */
243 
244 static int psmouse_handle_byte(struct psmouse *psmouse)
245 {
246 	psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
247 
248 	switch (rc) {
249 		case PSMOUSE_BAD_DATA:
250 			if (psmouse->state == PSMOUSE_ACTIVATED) {
251 				printk(KERN_WARNING "psmouse.c: %s at %s lost sync at byte %d\n",
252 					psmouse->name, psmouse->phys, psmouse->pktcnt);
253 				if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
254 					__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
255 					printk(KERN_NOTICE "psmouse.c: issuing reconnect request\n");
256 					serio_reconnect(psmouse->ps2dev.serio);
257 					return -1;
258 				}
259 			}
260 			psmouse->pktcnt = 0;
261 			break;
262 
263 		case PSMOUSE_FULL_PACKET:
264 			psmouse->pktcnt = 0;
265 			if (psmouse->out_of_sync_cnt) {
266 				psmouse->out_of_sync_cnt = 0;
267 				printk(KERN_NOTICE "psmouse.c: %s at %s - driver resynched.\n",
268 					psmouse->name, psmouse->phys);
269 			}
270 			break;
271 
272 		case PSMOUSE_GOOD_DATA:
273 			break;
274 	}
275 	return 0;
276 }
277 
278 /*
279  * psmouse_interrupt() handles incoming characters, either passing them
280  * for normal processing or gathering them as command response.
281  */
282 
283 static irqreturn_t psmouse_interrupt(struct serio *serio,
284 		unsigned char data, unsigned int flags)
285 {
286 	struct psmouse *psmouse = serio_get_drvdata(serio);
287 
288 	if (psmouse->state == PSMOUSE_IGNORE)
289 		goto out;
290 
291 	if (flags & (SERIO_PARITY|SERIO_TIMEOUT)) {
292 		if (psmouse->state == PSMOUSE_ACTIVATED)
293 			printk(KERN_WARNING "psmouse.c: bad data from KBC -%s%s\n",
294 				flags & SERIO_TIMEOUT ? " timeout" : "",
295 				flags & SERIO_PARITY ? " bad parity" : "");
296 		ps2_cmd_aborted(&psmouse->ps2dev);
297 		goto out;
298 	}
299 
300 	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
301 		if  (ps2_handle_ack(&psmouse->ps2dev, data))
302 			goto out;
303 
304 	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
305 		if  (ps2_handle_response(&psmouse->ps2dev, data))
306 			goto out;
307 
308 	if (psmouse->state <= PSMOUSE_RESYNCING)
309 		goto out;
310 
311 	if (psmouse->state == PSMOUSE_ACTIVATED &&
312 	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
313 		printk(KERN_INFO "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
314 		       psmouse->name, psmouse->phys, psmouse->pktcnt);
315 		psmouse->badbyte = psmouse->packet[0];
316 		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
317 		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
318 		goto out;
319 	}
320 
321 	psmouse->packet[psmouse->pktcnt++] = data;
322 /*
323  * Check if this is a new device announcement (0xAA 0x00)
324  */
325 	if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
326 		if (psmouse->pktcnt == 1) {
327 			psmouse->last = jiffies;
328 			goto out;
329 		}
330 
331 		if (psmouse->packet[1] == PSMOUSE_RET_ID ||
332 		    (psmouse->type == PSMOUSE_HGPK &&
333 		     psmouse->packet[1] == PSMOUSE_RET_BAT)) {
334 			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
335 			serio_reconnect(serio);
336 			goto out;
337 		}
338 /*
339  * Not a new device, try processing first byte normally
340  */
341 		psmouse->pktcnt = 1;
342 		if (psmouse_handle_byte(psmouse))
343 			goto out;
344 
345 		psmouse->packet[psmouse->pktcnt++] = data;
346 	}
347 
348 /*
349  * See if we need to force resync because mouse was idle for too long
350  */
351 	if (psmouse->state == PSMOUSE_ACTIVATED &&
352 	    psmouse->pktcnt == 1 && psmouse->resync_time &&
353 	    time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
354 		psmouse->badbyte = psmouse->packet[0];
355 		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
356 		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
357 		goto out;
358 	}
359 
360 	psmouse->last = jiffies;
361 	psmouse_handle_byte(psmouse);
362 
363  out:
364 	return IRQ_HANDLED;
365 }
366 
367 
368 /*
369  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
370  * using sliced syntax, understood by advanced devices, such as Logitech
371  * or Synaptics touchpads. The command is encoded as:
372  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
373  * is the command.
374  */
375 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
376 {
377 	int i;
378 
379 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
380 		return -1;
381 
382 	for (i = 6; i >= 0; i -= 2) {
383 		unsigned char d = (command >> i) & 3;
384 		if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
385 			return -1;
386 	}
387 
388 	return 0;
389 }
390 
391 
392 /*
393  * psmouse_reset() resets the mouse into power-on state.
394  */
395 int psmouse_reset(struct psmouse *psmouse)
396 {
397 	unsigned char param[2];
398 
399 	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
400 		return -1;
401 
402 	if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
403 		return -1;
404 
405 	return 0;
406 }
407 
408 
409 /*
410  * Genius NetMouse magic init.
411  */
412 static int genius_detect(struct psmouse *psmouse, bool set_properties)
413 {
414 	struct ps2dev *ps2dev = &psmouse->ps2dev;
415 	unsigned char param[4];
416 
417 	param[0] = 3;
418 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
419 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
420 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
421 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
422 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
423 
424 	if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
425 		return -1;
426 
427 	if (set_properties) {
428 		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
429 		__set_bit(BTN_SIDE, psmouse->dev->keybit);
430 		__set_bit(REL_WHEEL, psmouse->dev->relbit);
431 
432 		psmouse->vendor = "Genius";
433 		psmouse->name = "Mouse";
434 		psmouse->pktsize = 4;
435 	}
436 
437 	return 0;
438 }
439 
440 /*
441  * IntelliMouse magic init.
442  */
443 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
444 {
445 	struct ps2dev *ps2dev = &psmouse->ps2dev;
446 	unsigned char param[2];
447 
448 	param[0] = 200;
449 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
450 	param[0] = 100;
451 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
452 	param[0] =  80;
453 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
454 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
455 
456 	if (param[0] != 3)
457 		return -1;
458 
459 	if (set_properties) {
460 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
461 		__set_bit(REL_WHEEL, psmouse->dev->relbit);
462 
463 		if (!psmouse->vendor) psmouse->vendor = "Generic";
464 		if (!psmouse->name) psmouse->name = "Wheel Mouse";
465 		psmouse->pktsize = 4;
466 	}
467 
468 	return 0;
469 }
470 
471 /*
472  * Try IntelliMouse/Explorer magic init.
473  */
474 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
475 {
476 	struct ps2dev *ps2dev = &psmouse->ps2dev;
477 	unsigned char param[2];
478 
479 	intellimouse_detect(psmouse, 0);
480 
481 	param[0] = 200;
482 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
483 	param[0] = 200;
484 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
485 	param[0] =  80;
486 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
487 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
488 
489 	if (param[0] != 4)
490 		return -1;
491 
492 /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
493 	param[0] = 200;
494 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
495 	param[0] =  80;
496 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
497 	param[0] =  40;
498 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
499 
500 	if (set_properties) {
501 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
502 		__set_bit(REL_WHEEL, psmouse->dev->relbit);
503 		__set_bit(REL_HWHEEL, psmouse->dev->relbit);
504 		__set_bit(BTN_SIDE, psmouse->dev->keybit);
505 		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
506 
507 		if (!psmouse->vendor) psmouse->vendor = "Generic";
508 		if (!psmouse->name) psmouse->name = "Explorer Mouse";
509 		psmouse->pktsize = 4;
510 	}
511 
512 	return 0;
513 }
514 
515 /*
516  * Kensington ThinkingMouse / ExpertMouse magic init.
517  */
518 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
519 {
520 	struct ps2dev *ps2dev = &psmouse->ps2dev;
521 	unsigned char param[2];
522 	static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
523 	int i;
524 
525 	param[0] = 10;
526 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
527 	param[0] = 0;
528 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
529 	for (i = 0; i < ARRAY_SIZE(seq); i++) {
530 		param[0] = seq[i];
531 		ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
532 	}
533 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
534 
535 	if (param[0] != 2)
536 		return -1;
537 
538 	if (set_properties) {
539 		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
540 
541 		psmouse->vendor = "Kensington";
542 		psmouse->name = "ThinkingMouse";
543 	}
544 
545 	return 0;
546 }
547 
548 /*
549  * Bare PS/2 protocol "detection". Always succeeds.
550  */
551 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
552 {
553 	if (set_properties) {
554 		if (!psmouse->vendor) psmouse->vendor = "Generic";
555 		if (!psmouse->name) psmouse->name = "Mouse";
556 	}
557 
558 	return 0;
559 }
560 
561 /*
562  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
563  * must be forced by sysfs protocol writing.
564  */
565 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
566 {
567 	if (set_properties) {
568 		psmouse->vendor = "Cortron";
569 		psmouse->name = "PS/2 Trackball";
570 		__set_bit(BTN_SIDE, psmouse->dev->keybit);
571 	}
572 
573 	return 0;
574 }
575 
576 /*
577  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
578  * the mouse may have.
579  */
580 
581 static int psmouse_extensions(struct psmouse *psmouse,
582 			      unsigned int max_proto, bool set_properties)
583 {
584 	bool synaptics_hardware = true;
585 
586 /*
587  * We always check for lifebook because it does not disturb mouse
588  * (it only checks DMI information).
589  */
590 	if (lifebook_detect(psmouse, set_properties) == 0) {
591 		if (max_proto > PSMOUSE_IMEX) {
592 			if (!set_properties || lifebook_init(psmouse) == 0)
593 				return PSMOUSE_LIFEBOOK;
594 		}
595 	}
596 
597 /*
598  * Try Kensington ThinkingMouse (we try first, because synaptics probe
599  * upsets the thinkingmouse).
600  */
601 
602 	if (max_proto > PSMOUSE_IMEX && thinking_detect(psmouse, set_properties) == 0)
603 		return PSMOUSE_THINKPS;
604 
605 /*
606  * Try Synaptics TouchPad. Note that probing is done even if Synaptics protocol
607  * support is disabled in config - we need to know if it is synaptics so we
608  * can reset it properly after probing for intellimouse.
609  */
610 	if (max_proto > PSMOUSE_PS2 && synaptics_detect(psmouse, set_properties) == 0) {
611 		synaptics_hardware = true;
612 
613 		if (max_proto > PSMOUSE_IMEX) {
614 			if (!set_properties || synaptics_init(psmouse) == 0)
615 				return PSMOUSE_SYNAPTICS;
616 /*
617  * Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
618  * Unfortunately Logitech/Genius probes confuse some firmware versions so
619  * we'll have to skip them.
620  */
621 			max_proto = PSMOUSE_IMEX;
622 		}
623 /*
624  * Make sure that touchpad is in relative mode, gestures (taps) are enabled
625  */
626 		synaptics_reset(psmouse);
627 	}
628 
629 /*
630  * Try ALPS TouchPad
631  */
632 	if (max_proto > PSMOUSE_IMEX) {
633 		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
634 		if (alps_detect(psmouse, set_properties) == 0) {
635 			if (!set_properties || alps_init(psmouse) == 0)
636 				return PSMOUSE_ALPS;
637 /*
638  * Init failed, try basic relative protocols
639  */
640 			max_proto = PSMOUSE_IMEX;
641 		}
642 	}
643 
644 /*
645  * Try OLPC HGPK touchpad.
646  */
647 	if (max_proto > PSMOUSE_IMEX &&
648 			hgpk_detect(psmouse, set_properties) == 0) {
649 		if (!set_properties || hgpk_init(psmouse) == 0)
650 			return PSMOUSE_HGPK;
651 /*
652  * Init failed, try basic relative protocols
653  */
654 		max_proto = PSMOUSE_IMEX;
655 	}
656 
657 /*
658  * Try Elantech touchpad.
659  */
660 	if (max_proto > PSMOUSE_IMEX &&
661 			elantech_detect(psmouse, set_properties) == 0) {
662 		if (!set_properties || elantech_init(psmouse) == 0)
663 			return PSMOUSE_ELANTECH;
664 /*
665  * Init failed, try basic relative protocols
666  */
667 		max_proto = PSMOUSE_IMEX;
668 	}
669 
670 /*
671  * Try Finger Sensing Pad
672  */
673 	if (max_proto > PSMOUSE_IMEX) {
674 		if (fsp_detect(psmouse, set_properties) == 0) {
675 			if (!set_properties || fsp_init(psmouse) == 0)
676 				return PSMOUSE_FSP;
677 /*
678  * Init failed, try basic relative protocols
679  */
680 			max_proto = PSMOUSE_IMEX;
681 		}
682 	}
683 
684 	if (max_proto > PSMOUSE_IMEX) {
685 		if (genius_detect(psmouse, set_properties) == 0)
686 			return PSMOUSE_GENPS;
687 
688 		if (ps2pp_init(psmouse, set_properties) == 0)
689 			return PSMOUSE_PS2PP;
690 
691 		if (trackpoint_detect(psmouse, set_properties) == 0)
692 			return PSMOUSE_TRACKPOINT;
693 
694 		if (touchkit_ps2_detect(psmouse, set_properties) == 0)
695 			return PSMOUSE_TOUCHKIT_PS2;
696 	}
697 
698 /*
699  * Reset to defaults in case the device got confused by extended
700  * protocol probes. Note that we follow up with full reset because
701  * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
702  */
703 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
704 	psmouse_reset(psmouse);
705 
706 	if (max_proto >= PSMOUSE_IMEX && im_explorer_detect(psmouse, set_properties) == 0)
707 		return PSMOUSE_IMEX;
708 
709 	if (max_proto >= PSMOUSE_IMPS && intellimouse_detect(psmouse, set_properties) == 0)
710 		return PSMOUSE_IMPS;
711 
712 /*
713  * Okay, all failed, we have a standard mouse here. The number of the buttons
714  * is still a question, though. We assume 3.
715  */
716 	ps2bare_detect(psmouse, set_properties);
717 
718 	if (synaptics_hardware) {
719 /*
720  * We detected Synaptics hardware but it did not respond to IMPS/2 probes.
721  * We need to reset the touchpad because if there is a track point on the
722  * pass through port it could get disabled while probing for protocol
723  * extensions.
724  */
725 		psmouse_reset(psmouse);
726 	}
727 
728 	return PSMOUSE_PS2;
729 }
730 
731 static const struct psmouse_protocol psmouse_protocols[] = {
732 	{
733 		.type		= PSMOUSE_PS2,
734 		.name		= "PS/2",
735 		.alias		= "bare",
736 		.maxproto	= true,
737 		.detect		= ps2bare_detect,
738 	},
739 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
740 	{
741 		.type		= PSMOUSE_PS2PP,
742 		.name		= "PS2++",
743 		.alias		= "logitech",
744 		.detect		= ps2pp_init,
745 	},
746 #endif
747 	{
748 		.type		= PSMOUSE_THINKPS,
749 		.name		= "ThinkPS/2",
750 		.alias		= "thinkps",
751 		.detect		= thinking_detect,
752 	},
753 	{
754 		.type		= PSMOUSE_GENPS,
755 		.name		= "GenPS/2",
756 		.alias		= "genius",
757 		.detect		= genius_detect,
758 	},
759 	{
760 		.type		= PSMOUSE_IMPS,
761 		.name		= "ImPS/2",
762 		.alias		= "imps",
763 		.maxproto	= true,
764 		.detect		= intellimouse_detect,
765 	},
766 	{
767 		.type		= PSMOUSE_IMEX,
768 		.name		= "ImExPS/2",
769 		.alias		= "exps",
770 		.maxproto	= true,
771 		.detect		= im_explorer_detect,
772 	},
773 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
774 	{
775 		.type		= PSMOUSE_SYNAPTICS,
776 		.name		= "SynPS/2",
777 		.alias		= "synaptics",
778 		.detect		= synaptics_detect,
779 		.init		= synaptics_init,
780 	},
781 #endif
782 #ifdef CONFIG_MOUSE_PS2_ALPS
783 	{
784 		.type		= PSMOUSE_ALPS,
785 		.name		= "AlpsPS/2",
786 		.alias		= "alps",
787 		.detect		= alps_detect,
788 		.init		= alps_init,
789 	},
790 #endif
791 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
792 	{
793 		.type		= PSMOUSE_LIFEBOOK,
794 		.name		= "LBPS/2",
795 		.alias		= "lifebook",
796 		.init		= lifebook_init,
797 	},
798 #endif
799 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
800 	{
801 		.type		= PSMOUSE_TRACKPOINT,
802 		.name		= "TPPS/2",
803 		.alias		= "trackpoint",
804 		.detect		= trackpoint_detect,
805 	},
806 #endif
807 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
808 	{
809 		.type		= PSMOUSE_TOUCHKIT_PS2,
810 		.name		= "touchkitPS/2",
811 		.alias		= "touchkit",
812 		.detect		= touchkit_ps2_detect,
813 	},
814 #endif
815 #ifdef CONFIG_MOUSE_PS2_OLPC
816 	{
817 		.type		= PSMOUSE_HGPK,
818 		.name		= "OLPC HGPK",
819 		.alias		= "hgpk",
820 		.detect		= hgpk_detect,
821 	},
822 #endif
823 #ifdef CONFIG_MOUSE_PS2_ELANTECH
824 	{
825 		.type		= PSMOUSE_ELANTECH,
826 		.name		= "ETPS/2",
827 		.alias		= "elantech",
828 		.detect		= elantech_detect,
829 		.init		= elantech_init,
830 	},
831 #endif
832 #ifdef CONFIG_MOUSE_PS2_SENTELIC
833 	{
834 		.type		= PSMOUSE_FSP,
835 		.name		= "FSPPS/2",
836 		.alias		= "fsp",
837 		.detect		= fsp_detect,
838 		.init		= fsp_init,
839 	},
840 #endif
841 	{
842 		.type		= PSMOUSE_CORTRON,
843 		.name		= "CortronPS/2",
844 		.alias		= "cortps",
845 		.detect		= cortron_detect,
846 	},
847 	{
848 		.type		= PSMOUSE_AUTO,
849 		.name		= "auto",
850 		.alias		= "any",
851 		.maxproto	= true,
852 	},
853 };
854 
855 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
856 {
857 	int i;
858 
859 	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
860 		if (psmouse_protocols[i].type == type)
861 			return &psmouse_protocols[i];
862 
863 	WARN_ON(1);
864 	return &psmouse_protocols[0];
865 }
866 
867 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
868 {
869 	const struct psmouse_protocol *p;
870 	int i;
871 
872 	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
873 		p = &psmouse_protocols[i];
874 
875 		if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
876 		    (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
877 			return &psmouse_protocols[i];
878 	}
879 
880 	return NULL;
881 }
882 
883 
884 /*
885  * psmouse_probe() probes for a PS/2 mouse.
886  */
887 
888 static int psmouse_probe(struct psmouse *psmouse)
889 {
890 	struct ps2dev *ps2dev = &psmouse->ps2dev;
891 	unsigned char param[2];
892 
893 /*
894  * First, we check if it's a mouse. It should send 0x00 or 0x03
895  * in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
896  * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and subsequent
897  * ID queries, probably due to a firmware bug.
898  */
899 
900 	param[0] = 0xa5;
901 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
902 		return -1;
903 
904 	if (param[0] != 0x00 && param[0] != 0x03 &&
905 	    param[0] != 0x04 && param[0] != 0xff)
906 		return -1;
907 
908 /*
909  * Then we reset and disable the mouse so that it doesn't generate events.
910  */
911 
912 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
913 		printk(KERN_WARNING "psmouse.c: Failed to reset mouse on %s\n", ps2dev->serio->phys);
914 
915 	return 0;
916 }
917 
918 /*
919  * Here we set the mouse resolution.
920  */
921 
922 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
923 {
924 	static const unsigned char params[] = { 0, 1, 2, 2, 3 };
925 	unsigned char p;
926 
927 	if (resolution == 0 || resolution > 200)
928 		resolution = 200;
929 
930 	p = params[resolution / 50];
931 	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
932 	psmouse->resolution = 25 << p;
933 }
934 
935 /*
936  * Here we set the mouse report rate.
937  */
938 
939 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
940 {
941 	static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
942 	unsigned char r;
943 	int i = 0;
944 
945 	while (rates[i] > rate) i++;
946 	r = rates[i];
947 	ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
948 	psmouse->rate = r;
949 }
950 
951 /*
952  * psmouse_initialize() initializes the mouse to a sane state.
953  */
954 
955 static void psmouse_initialize(struct psmouse *psmouse)
956 {
957 /*
958  * We set the mouse report rate, resolution and scaling.
959  */
960 
961 	if (psmouse_max_proto != PSMOUSE_PS2) {
962 		psmouse->set_rate(psmouse, psmouse->rate);
963 		psmouse->set_resolution(psmouse, psmouse->resolution);
964 		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
965 	}
966 }
967 
968 /*
969  * psmouse_activate() enables the mouse so that we get motion reports from it.
970  */
971 
972 static void psmouse_activate(struct psmouse *psmouse)
973 {
974 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE))
975 		printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n",
976 			psmouse->ps2dev.serio->phys);
977 
978 	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
979 }
980 
981 
982 /*
983  * psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
984  * reports from it unless we explicitly request it.
985  */
986 
987 static void psmouse_deactivate(struct psmouse *psmouse)
988 {
989 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
990 		printk(KERN_WARNING "psmouse.c: Failed to deactivate mouse on %s\n",
991 			psmouse->ps2dev.serio->phys);
992 
993 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
994 }
995 
996 /*
997  * psmouse_poll() - default poll hanlder. Everyone except for ALPS uses it.
998  */
999 
1000 static int psmouse_poll(struct psmouse *psmouse)
1001 {
1002 	return ps2_command(&psmouse->ps2dev, psmouse->packet,
1003 			   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
1004 }
1005 
1006 
1007 /*
1008  * psmouse_resync() attempts to re-validate current protocol.
1009  */
1010 
1011 static void psmouse_resync(struct work_struct *work)
1012 {
1013 	struct psmouse *parent = NULL, *psmouse =
1014 		container_of(work, struct psmouse, resync_work.work);
1015 	struct serio *serio = psmouse->ps2dev.serio;
1016 	psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1017 	bool failed = false, enabled = false;
1018 	int i;
1019 
1020 	mutex_lock(&psmouse_mutex);
1021 
1022 	if (psmouse->state != PSMOUSE_RESYNCING)
1023 		goto out;
1024 
1025 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1026 		parent = serio_get_drvdata(serio->parent);
1027 		psmouse_deactivate(parent);
1028 	}
1029 
1030 /*
1031  * Some mice don't ACK commands sent while they are in the middle of
1032  * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1033  * instead of ps2_command() which would wait for 200ms for an ACK
1034  * that may never come.
1035  * As an additional quirk ALPS touchpads may not only forget to ACK
1036  * disable command but will stop reporting taps, so if we see that
1037  * mouse at least once ACKs disable we will do full reconnect if ACK
1038  * is missing.
1039  */
1040 	psmouse->num_resyncs++;
1041 
1042 	if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1043 		if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1044 			failed = true;
1045 	} else
1046 		psmouse->acks_disable_command = true;
1047 
1048 /*
1049  * Poll the mouse. If it was reset the packet will be shorter than
1050  * psmouse->pktsize and ps2_command will fail. We do not expect and
1051  * do not handle scenario when mouse "upgrades" its protocol while
1052  * disconnected since it would require additional delay. If we ever
1053  * see a mouse that does it we'll adjust the code.
1054  */
1055 	if (!failed) {
1056 		if (psmouse->poll(psmouse))
1057 			failed = true;
1058 		else {
1059 			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1060 			for (i = 0; i < psmouse->pktsize; i++) {
1061 				psmouse->pktcnt++;
1062 				rc = psmouse->protocol_handler(psmouse);
1063 				if (rc != PSMOUSE_GOOD_DATA)
1064 					break;
1065 			}
1066 			if (rc != PSMOUSE_FULL_PACKET)
1067 				failed = true;
1068 			psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1069 		}
1070 	}
1071 /*
1072  * Now try to enable mouse. We try to do that even if poll failed and also
1073  * repeat our attempts 5 times, otherwise we may be left out with disabled
1074  * mouse.
1075  */
1076 	for (i = 0; i < 5; i++) {
1077 		if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1078 			enabled = true;
1079 			break;
1080 		}
1081 		msleep(200);
1082 	}
1083 
1084 	if (!enabled) {
1085 		printk(KERN_WARNING "psmouse.c: failed to re-enable mouse on %s\n",
1086 			psmouse->ps2dev.serio->phys);
1087 		failed = true;
1088 	}
1089 
1090 	if (failed) {
1091 		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1092 		printk(KERN_INFO "psmouse.c: resync failed, issuing reconnect request\n");
1093 		serio_reconnect(serio);
1094 	} else
1095 		psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1096 
1097 	if (parent)
1098 		psmouse_activate(parent);
1099  out:
1100 	mutex_unlock(&psmouse_mutex);
1101 }
1102 
1103 /*
1104  * psmouse_cleanup() resets the mouse into power-on state.
1105  */
1106 
1107 static void psmouse_cleanup(struct serio *serio)
1108 {
1109 	struct psmouse *psmouse = serio_get_drvdata(serio);
1110 	struct psmouse *parent = NULL;
1111 
1112 	mutex_lock(&psmouse_mutex);
1113 
1114 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1115 		parent = serio_get_drvdata(serio->parent);
1116 		psmouse_deactivate(parent);
1117 	}
1118 
1119 	psmouse_deactivate(psmouse);
1120 
1121 	if (psmouse->cleanup)
1122 		psmouse->cleanup(psmouse);
1123 
1124 	psmouse_reset(psmouse);
1125 
1126 /*
1127  * Some boxes, such as HP nx7400, get terribly confused if mouse
1128  * is not fully enabled before suspending/shutting down.
1129  */
1130 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1131 
1132 	if (parent) {
1133 		if (parent->pt_deactivate)
1134 			parent->pt_deactivate(parent);
1135 
1136 		psmouse_activate(parent);
1137 	}
1138 
1139 	mutex_unlock(&psmouse_mutex);
1140 }
1141 
1142 /*
1143  * psmouse_disconnect() closes and frees.
1144  */
1145 
1146 static void psmouse_disconnect(struct serio *serio)
1147 {
1148 	struct psmouse *psmouse, *parent = NULL;
1149 
1150 	psmouse = serio_get_drvdata(serio);
1151 
1152 	sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1153 
1154 	mutex_lock(&psmouse_mutex);
1155 
1156 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1157 
1158 	/* make sure we don't have a resync in progress */
1159 	mutex_unlock(&psmouse_mutex);
1160 	flush_workqueue(kpsmoused_wq);
1161 	mutex_lock(&psmouse_mutex);
1162 
1163 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1164 		parent = serio_get_drvdata(serio->parent);
1165 		psmouse_deactivate(parent);
1166 	}
1167 
1168 	if (psmouse->disconnect)
1169 		psmouse->disconnect(psmouse);
1170 
1171 	if (parent && parent->pt_deactivate)
1172 		parent->pt_deactivate(parent);
1173 
1174 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1175 
1176 	serio_close(serio);
1177 	serio_set_drvdata(serio, NULL);
1178 	input_unregister_device(psmouse->dev);
1179 	kfree(psmouse);
1180 
1181 	if (parent)
1182 		psmouse_activate(parent);
1183 
1184 	mutex_unlock(&psmouse_mutex);
1185 }
1186 
1187 static int psmouse_switch_protocol(struct psmouse *psmouse, const struct psmouse_protocol *proto)
1188 {
1189 	struct input_dev *input_dev = psmouse->dev;
1190 
1191 	input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1192 
1193 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
1194 	input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
1195 		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
1196 	input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
1197 
1198 	psmouse->set_rate = psmouse_set_rate;
1199 	psmouse->set_resolution = psmouse_set_resolution;
1200 	psmouse->poll = psmouse_poll;
1201 	psmouse->protocol_handler = psmouse_process_byte;
1202 	psmouse->pktsize = 3;
1203 
1204 	if (proto && (proto->detect || proto->init)) {
1205 		if (proto->detect && proto->detect(psmouse, 1) < 0)
1206 			return -1;
1207 
1208 		if (proto->init && proto->init(psmouse) < 0)
1209 			return -1;
1210 
1211 		psmouse->type = proto->type;
1212 	}
1213 	else
1214 		psmouse->type = psmouse_extensions(psmouse,
1215 						   psmouse_max_proto, true);
1216 
1217 	/*
1218 	 * If mouse's packet size is 3 there is no point in polling the
1219 	 * device in hopes to detect protocol reset - we won't get less
1220 	 * than 3 bytes response anyhow.
1221 	 */
1222 	if (psmouse->pktsize == 3)
1223 		psmouse->resync_time = 0;
1224 
1225 	/*
1226 	 * Some smart KVMs fake response to POLL command returning just
1227 	 * 3 bytes and messing up our resync logic, so if initial poll
1228 	 * fails we won't try polling the device anymore. Hopefully
1229 	 * such KVM will maintain initially selected protocol.
1230 	 */
1231 	if (psmouse->resync_time && psmouse->poll(psmouse))
1232 		psmouse->resync_time = 0;
1233 
1234 	snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1235 		 psmouse_protocol_by_type(psmouse->type)->name, psmouse->vendor, psmouse->name);
1236 
1237 	input_dev->name = psmouse->devname;
1238 	input_dev->phys = psmouse->phys;
1239 	input_dev->id.bustype = BUS_I8042;
1240 	input_dev->id.vendor = 0x0002;
1241 	input_dev->id.product = psmouse->type;
1242 	input_dev->id.version = psmouse->model;
1243 
1244 	return 0;
1245 }
1246 
1247 /*
1248  * psmouse_connect() is a callback from the serio module when
1249  * an unhandled serio port is found.
1250  */
1251 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1252 {
1253 	struct psmouse *psmouse, *parent = NULL;
1254 	struct input_dev *input_dev;
1255 	int retval = 0, error = -ENOMEM;
1256 
1257 	mutex_lock(&psmouse_mutex);
1258 
1259 	/*
1260 	 * If this is a pass-through port deactivate parent so the device
1261 	 * connected to this port can be successfully identified
1262 	 */
1263 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1264 		parent = serio_get_drvdata(serio->parent);
1265 		psmouse_deactivate(parent);
1266 	}
1267 
1268 	psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1269 	input_dev = input_allocate_device();
1270 	if (!psmouse || !input_dev)
1271 		goto err_free;
1272 
1273 	ps2_init(&psmouse->ps2dev, serio);
1274 	INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1275 	psmouse->dev = input_dev;
1276 	snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1277 
1278 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1279 
1280 	serio_set_drvdata(serio, psmouse);
1281 
1282 	error = serio_open(serio, drv);
1283 	if (error)
1284 		goto err_clear_drvdata;
1285 
1286 	if (psmouse_probe(psmouse) < 0) {
1287 		error = -ENODEV;
1288 		goto err_close_serio;
1289 	}
1290 
1291 	psmouse->rate = psmouse_rate;
1292 	psmouse->resolution = psmouse_resolution;
1293 	psmouse->resetafter = psmouse_resetafter;
1294 	psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1295 	psmouse->smartscroll = psmouse_smartscroll;
1296 
1297 	psmouse_switch_protocol(psmouse, NULL);
1298 
1299 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1300 	psmouse_initialize(psmouse);
1301 
1302 	error = input_register_device(psmouse->dev);
1303 	if (error)
1304 		goto err_protocol_disconnect;
1305 
1306 	if (parent && parent->pt_activate)
1307 		parent->pt_activate(parent);
1308 
1309 	error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1310 	if (error)
1311 		goto err_pt_deactivate;
1312 
1313 	psmouse_activate(psmouse);
1314 
1315  out:
1316 	/* If this is a pass-through port the parent needs to be re-activated */
1317 	if (parent)
1318 		psmouse_activate(parent);
1319 
1320 	mutex_unlock(&psmouse_mutex);
1321 	return retval;
1322 
1323  err_pt_deactivate:
1324 	if (parent && parent->pt_deactivate)
1325 		parent->pt_deactivate(parent);
1326 	input_unregister_device(psmouse->dev);
1327 	input_dev = NULL; /* so we don't try to free it below */
1328  err_protocol_disconnect:
1329 	if (psmouse->disconnect)
1330 		psmouse->disconnect(psmouse);
1331 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1332  err_close_serio:
1333 	serio_close(serio);
1334  err_clear_drvdata:
1335 	serio_set_drvdata(serio, NULL);
1336  err_free:
1337 	input_free_device(input_dev);
1338 	kfree(psmouse);
1339 
1340 	retval = error;
1341 	goto out;
1342 }
1343 
1344 
1345 static int psmouse_reconnect(struct serio *serio)
1346 {
1347 	struct psmouse *psmouse = serio_get_drvdata(serio);
1348 	struct psmouse *parent = NULL;
1349 	struct serio_driver *drv = serio->drv;
1350 	int rc = -1;
1351 
1352 	if (!drv || !psmouse) {
1353 		printk(KERN_DEBUG "psmouse: reconnect request, but serio is disconnected, ignoring...\n");
1354 		return -1;
1355 	}
1356 
1357 	mutex_lock(&psmouse_mutex);
1358 
1359 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1360 		parent = serio_get_drvdata(serio->parent);
1361 		psmouse_deactivate(parent);
1362 	}
1363 
1364 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1365 
1366 	if (psmouse->reconnect) {
1367 		if (psmouse->reconnect(psmouse))
1368 			goto out;
1369 	} else if (psmouse_probe(psmouse) < 0 ||
1370 		   psmouse->type != psmouse_extensions(psmouse,
1371 						psmouse_max_proto, false)) {
1372 		goto out;
1373 	}
1374 
1375 	/* ok, the device type (and capabilities) match the old one,
1376 	 * we can continue using it, complete intialization
1377 	 */
1378 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1379 
1380 	psmouse_initialize(psmouse);
1381 
1382 	if (parent && parent->pt_activate)
1383 		parent->pt_activate(parent);
1384 
1385 	psmouse_activate(psmouse);
1386 	rc = 0;
1387 
1388 out:
1389 	/* If this is a pass-through port the parent waits to be activated */
1390 	if (parent)
1391 		psmouse_activate(parent);
1392 
1393 	mutex_unlock(&psmouse_mutex);
1394 	return rc;
1395 }
1396 
1397 static struct serio_device_id psmouse_serio_ids[] = {
1398 	{
1399 		.type	= SERIO_8042,
1400 		.proto	= SERIO_ANY,
1401 		.id	= SERIO_ANY,
1402 		.extra	= SERIO_ANY,
1403 	},
1404 	{
1405 		.type	= SERIO_PS_PSTHRU,
1406 		.proto	= SERIO_ANY,
1407 		.id	= SERIO_ANY,
1408 		.extra	= SERIO_ANY,
1409 	},
1410 	{ 0 }
1411 };
1412 
1413 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1414 
1415 static struct serio_driver psmouse_drv = {
1416 	.driver		= {
1417 		.name	= "psmouse",
1418 	},
1419 	.description	= DRIVER_DESC,
1420 	.id_table	= psmouse_serio_ids,
1421 	.interrupt	= psmouse_interrupt,
1422 	.connect	= psmouse_connect,
1423 	.reconnect	= psmouse_reconnect,
1424 	.disconnect	= psmouse_disconnect,
1425 	.cleanup	= psmouse_cleanup,
1426 };
1427 
1428 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1429 				 char *buf)
1430 {
1431 	struct serio *serio = to_serio_port(dev);
1432 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1433 	struct psmouse *psmouse;
1434 	int retval;
1435 
1436 	retval = serio_pin_driver(serio);
1437 	if (retval)
1438 		return retval;
1439 
1440 	if (serio->drv != &psmouse_drv) {
1441 		retval = -ENODEV;
1442 		goto out;
1443 	}
1444 
1445 	psmouse = serio_get_drvdata(serio);
1446 
1447 	retval = attr->show(psmouse, attr->data, buf);
1448 
1449 out:
1450 	serio_unpin_driver(serio);
1451 	return retval;
1452 }
1453 
1454 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1455 				const char *buf, size_t count)
1456 {
1457 	struct serio *serio = to_serio_port(dev);
1458 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1459 	struct psmouse *psmouse, *parent = NULL;
1460 	int retval;
1461 
1462 	retval = serio_pin_driver(serio);
1463 	if (retval)
1464 		return retval;
1465 
1466 	if (serio->drv != &psmouse_drv) {
1467 		retval = -ENODEV;
1468 		goto out_unpin;
1469 	}
1470 
1471 	retval = mutex_lock_interruptible(&psmouse_mutex);
1472 	if (retval)
1473 		goto out_unpin;
1474 
1475 	psmouse = serio_get_drvdata(serio);
1476 
1477 	if (attr->protect) {
1478 		if (psmouse->state == PSMOUSE_IGNORE) {
1479 			retval = -ENODEV;
1480 			goto out_unlock;
1481 		}
1482 
1483 		if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1484 			parent = serio_get_drvdata(serio->parent);
1485 			psmouse_deactivate(parent);
1486 		}
1487 
1488 		psmouse_deactivate(psmouse);
1489 	}
1490 
1491 	retval = attr->set(psmouse, attr->data, buf, count);
1492 
1493 	if (attr->protect) {
1494 		if (retval != -ENODEV)
1495 			psmouse_activate(psmouse);
1496 
1497 		if (parent)
1498 			psmouse_activate(parent);
1499 	}
1500 
1501  out_unlock:
1502 	mutex_unlock(&psmouse_mutex);
1503  out_unpin:
1504 	serio_unpin_driver(serio);
1505 	return retval;
1506 }
1507 
1508 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1509 {
1510 	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1511 
1512 	return sprintf(buf, "%u\n", *field);
1513 }
1514 
1515 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1516 {
1517 	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1518 	unsigned long value;
1519 
1520 	if (strict_strtoul(buf, 10, &value))
1521 		return -EINVAL;
1522 
1523 	if ((unsigned int)value != value)
1524 		return -EINVAL;
1525 
1526 	*field = value;
1527 
1528 	return count;
1529 }
1530 
1531 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1532 {
1533 	return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
1534 }
1535 
1536 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1537 {
1538 	struct serio *serio = psmouse->ps2dev.serio;
1539 	struct psmouse *parent = NULL;
1540 	struct input_dev *old_dev, *new_dev;
1541 	const struct psmouse_protocol *proto, *old_proto;
1542 	int error;
1543 	int retry = 0;
1544 
1545 	proto = psmouse_protocol_by_name(buf, count);
1546 	if (!proto)
1547 		return -EINVAL;
1548 
1549 	if (psmouse->type == proto->type)
1550 		return count;
1551 
1552 	new_dev = input_allocate_device();
1553 	if (!new_dev)
1554 		return -ENOMEM;
1555 
1556 	while (serio->child) {
1557 		if (++retry > 3) {
1558 			printk(KERN_WARNING
1559 				"psmouse: failed to destroy child port, "
1560 				"protocol change aborted.\n");
1561 			input_free_device(new_dev);
1562 			return -EIO;
1563 		}
1564 
1565 		mutex_unlock(&psmouse_mutex);
1566 		serio_unpin_driver(serio);
1567 		serio_unregister_child_port(serio);
1568 		serio_pin_driver_uninterruptible(serio);
1569 		mutex_lock(&psmouse_mutex);
1570 
1571 		if (serio->drv != &psmouse_drv) {
1572 			input_free_device(new_dev);
1573 			return -ENODEV;
1574 		}
1575 
1576 		if (psmouse->type == proto->type) {
1577 			input_free_device(new_dev);
1578 			return count; /* switched by other thread */
1579 		}
1580 	}
1581 
1582 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1583 		parent = serio_get_drvdata(serio->parent);
1584 		if (parent->pt_deactivate)
1585 			parent->pt_deactivate(parent);
1586 	}
1587 
1588 	old_dev = psmouse->dev;
1589 	old_proto = psmouse_protocol_by_type(psmouse->type);
1590 
1591 	if (psmouse->disconnect)
1592 		psmouse->disconnect(psmouse);
1593 
1594 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1595 
1596 	psmouse->dev = new_dev;
1597 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1598 
1599 	if (psmouse_switch_protocol(psmouse, proto) < 0) {
1600 		psmouse_reset(psmouse);
1601 		/* default to PSMOUSE_PS2 */
1602 		psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1603 	}
1604 
1605 	psmouse_initialize(psmouse);
1606 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1607 
1608 	error = input_register_device(psmouse->dev);
1609 	if (error) {
1610 		if (psmouse->disconnect)
1611 			psmouse->disconnect(psmouse);
1612 
1613 		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1614 		input_free_device(new_dev);
1615 		psmouse->dev = old_dev;
1616 		psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1617 		psmouse_switch_protocol(psmouse, old_proto);
1618 		psmouse_initialize(psmouse);
1619 		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1620 
1621 		return error;
1622 	}
1623 
1624 	input_unregister_device(old_dev);
1625 
1626 	if (parent && parent->pt_activate)
1627 		parent->pt_activate(parent);
1628 
1629 	return count;
1630 }
1631 
1632 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1633 {
1634 	unsigned long value;
1635 
1636 	if (strict_strtoul(buf, 10, &value))
1637 		return -EINVAL;
1638 
1639 	psmouse->set_rate(psmouse, value);
1640 	return count;
1641 }
1642 
1643 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1644 {
1645 	unsigned long value;
1646 
1647 	if (strict_strtoul(buf, 10, &value))
1648 		return -EINVAL;
1649 
1650 	psmouse->set_resolution(psmouse, value);
1651 	return count;
1652 }
1653 
1654 
1655 static int psmouse_set_maxproto(const char *val, struct kernel_param *kp)
1656 {
1657 	const struct psmouse_protocol *proto;
1658 
1659 	if (!val)
1660 		return -EINVAL;
1661 
1662 	proto = psmouse_protocol_by_name(val, strlen(val));
1663 
1664 	if (!proto || !proto->maxproto)
1665 		return -EINVAL;
1666 
1667 	*((unsigned int *)kp->arg) = proto->type;
1668 
1669 	return 0;
1670 }
1671 
1672 static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp)
1673 {
1674 	int type = *((unsigned int *)kp->arg);
1675 
1676 	return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
1677 }
1678 
1679 static int __init psmouse_init(void)
1680 {
1681 	int err;
1682 
1683 	kpsmoused_wq = create_singlethread_workqueue("kpsmoused");
1684 	if (!kpsmoused_wq) {
1685 		printk(KERN_ERR "psmouse: failed to create kpsmoused workqueue\n");
1686 		return -ENOMEM;
1687 	}
1688 
1689 	err = serio_register_driver(&psmouse_drv);
1690 	if (err)
1691 		destroy_workqueue(kpsmoused_wq);
1692 
1693 	return err;
1694 }
1695 
1696 static void __exit psmouse_exit(void)
1697 {
1698 	serio_unregister_driver(&psmouse_drv);
1699 	destroy_workqueue(kpsmoused_wq);
1700 }
1701 
1702 module_init(psmouse_init);
1703 module_exit(psmouse_exit);
1704