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 #define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
15 #define psmouse_fmt(fmt)	fmt
16 
17 #include <linux/delay.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/interrupt.h>
21 #include <linux/input.h>
22 #include <linux/serio.h>
23 #include <linux/init.h>
24 #include <linux/libps2.h>
25 #include <linux/mutex.h>
26 
27 #include "psmouse.h"
28 #include "synaptics.h"
29 #include "logips2pp.h"
30 #include "alps.h"
31 #include "hgpk.h"
32 #include "lifebook.h"
33 #include "trackpoint.h"
34 #include "touchkit_ps2.h"
35 #include "elantech.h"
36 #include "sentelic.h"
37 #include "cypress_ps2.h"
38 #include "focaltech.h"
39 #include "vmmouse.h"
40 #include "byd.h"
41 
42 #define DRIVER_DESC	"PS/2 mouse driver"
43 
44 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
45 MODULE_DESCRIPTION(DRIVER_DESC);
46 MODULE_LICENSE("GPL");
47 
48 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
49 static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
50 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
51 static const struct kernel_param_ops param_ops_proto_abbrev = {
52 	.set = psmouse_set_maxproto,
53 	.get = psmouse_get_maxproto,
54 };
55 #define param_check_proto_abbrev(name, p)	__param_check(name, p, unsigned int)
56 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
57 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
58 
59 static unsigned int psmouse_resolution = 200;
60 module_param_named(resolution, psmouse_resolution, uint, 0644);
61 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
62 
63 static unsigned int psmouse_rate = 100;
64 module_param_named(rate, psmouse_rate, uint, 0644);
65 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
66 
67 static bool psmouse_smartscroll = true;
68 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
69 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
70 
71 static unsigned int psmouse_resetafter = 5;
72 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
73 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
74 
75 static unsigned int psmouse_resync_time;
76 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
77 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
78 
79 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
80 			NULL,
81 			psmouse_attr_show_protocol, psmouse_attr_set_protocol);
82 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
83 			(void *) offsetof(struct psmouse, rate),
84 			psmouse_show_int_attr, psmouse_attr_set_rate);
85 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
86 			(void *) offsetof(struct psmouse, resolution),
87 			psmouse_show_int_attr, psmouse_attr_set_resolution);
88 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
89 			(void *) offsetof(struct psmouse, resetafter),
90 			psmouse_show_int_attr, psmouse_set_int_attr);
91 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
92 			(void *) offsetof(struct psmouse, resync_time),
93 			psmouse_show_int_attr, psmouse_set_int_attr);
94 
95 static struct attribute *psmouse_attributes[] = {
96 	&psmouse_attr_protocol.dattr.attr,
97 	&psmouse_attr_rate.dattr.attr,
98 	&psmouse_attr_resolution.dattr.attr,
99 	&psmouse_attr_resetafter.dattr.attr,
100 	&psmouse_attr_resync_time.dattr.attr,
101 	NULL
102 };
103 
104 static struct attribute_group psmouse_attribute_group = {
105 	.attrs	= psmouse_attributes,
106 };
107 
108 /*
109  * psmouse_mutex protects all operations changing state of mouse
110  * (connecting, disconnecting, changing rate or resolution via
111  * sysfs). We could use a per-device semaphore but since there
112  * rarely more than one PS/2 mouse connected and since semaphore
113  * is taken in "slow" paths it is not worth it.
114  */
115 static DEFINE_MUTEX(psmouse_mutex);
116 
117 static struct workqueue_struct *kpsmoused_wq;
118 
119 struct psmouse_protocol {
120 	enum psmouse_type type;
121 	bool maxproto;
122 	bool ignore_parity; /* Protocol should ignore parity errors from KBC */
123 	bool try_passthru; /* Try protocol also on passthrough ports */
124 	const char *name;
125 	const char *alias;
126 	int (*detect)(struct psmouse *, bool);
127 	int (*init)(struct psmouse *);
128 };
129 
130 /*
131  * psmouse_process_byte() analyzes the PS/2 data stream and reports
132  * relevant events to the input module once full packet has arrived.
133  */
134 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
135 {
136 	struct input_dev *dev = psmouse->dev;
137 	unsigned char *packet = psmouse->packet;
138 
139 	if (psmouse->pktcnt < psmouse->pktsize)
140 		return PSMOUSE_GOOD_DATA;
141 
142 	/* Full packet accumulated, process it */
143 
144 	switch (psmouse->type) {
145 	case PSMOUSE_IMPS:
146 		/* IntelliMouse has scroll wheel */
147 		input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
148 		break;
149 
150 	case PSMOUSE_IMEX:
151 		/* Scroll wheel and buttons on IntelliMouse Explorer */
152 		switch (packet[3] & 0xC0) {
153 		case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
154 			input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
155 			break;
156 		case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
157 			input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
158 			break;
159 		case 0x00:
160 		case 0xC0:
161 			input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
162 			input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
163 			input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
164 			break;
165 		}
166 		break;
167 
168 	case PSMOUSE_GENPS:
169 		/* Report scroll buttons on NetMice */
170 		input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
171 
172 		/* Extra buttons on Genius NewNet 3D */
173 		input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
174 		input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
175 		break;
176 
177 	case PSMOUSE_THINKPS:
178 		/* Extra button on ThinkingMouse */
179 		input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
180 
181 		/*
182 		 * Without this bit of weirdness moving up gives wildly
183 		 * high Y changes.
184 		 */
185 		packet[1] |= (packet[0] & 0x40) << 1;
186 		break;
187 
188 	case PSMOUSE_CORTRON:
189 		/*
190 		 * Cortron PS2 Trackball reports SIDE button in the
191 		 * 4th bit of the first byte.
192 		 */
193 		input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
194 		packet[0] |= 0x08;
195 		break;
196 
197 	default:
198 		break;
199 	}
200 
201 	/* Generic PS/2 Mouse */
202 	input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
203 	input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
204 	input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);
205 
206 	input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
207 	input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
208 
209 	input_sync(dev);
210 
211 	return PSMOUSE_FULL_PACKET;
212 }
213 
214 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
215 		unsigned long delay)
216 {
217 	queue_delayed_work(kpsmoused_wq, work, delay);
218 }
219 
220 /*
221  * __psmouse_set_state() sets new psmouse state and resets all flags.
222  */
223 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
224 {
225 	psmouse->state = new_state;
226 	psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
227 	psmouse->ps2dev.flags = 0;
228 	psmouse->last = jiffies;
229 }
230 
231 /*
232  * psmouse_set_state() sets new psmouse state and resets all flags and
233  * counters while holding serio lock so fighting with interrupt handler
234  * is not a concern.
235  */
236 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
237 {
238 	serio_pause_rx(psmouse->ps2dev.serio);
239 	__psmouse_set_state(psmouse, new_state);
240 	serio_continue_rx(psmouse->ps2dev.serio);
241 }
242 
243 /*
244  * psmouse_handle_byte() processes one byte of the input data stream
245  * by calling corresponding protocol handler.
246  */
247 static int psmouse_handle_byte(struct psmouse *psmouse)
248 {
249 	psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
250 
251 	switch (rc) {
252 	case PSMOUSE_BAD_DATA:
253 		if (psmouse->state == PSMOUSE_ACTIVATED) {
254 			psmouse_warn(psmouse,
255 				     "%s at %s lost sync at byte %d\n",
256 				     psmouse->name, psmouse->phys,
257 				     psmouse->pktcnt);
258 			if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
259 				__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
260 				psmouse_notice(psmouse,
261 						"issuing reconnect request\n");
262 				serio_reconnect(psmouse->ps2dev.serio);
263 				return -1;
264 			}
265 		}
266 		psmouse->pktcnt = 0;
267 		break;
268 
269 	case PSMOUSE_FULL_PACKET:
270 		psmouse->pktcnt = 0;
271 		if (psmouse->out_of_sync_cnt) {
272 			psmouse->out_of_sync_cnt = 0;
273 			psmouse_notice(psmouse,
274 					"%s at %s - driver resynced.\n",
275 					psmouse->name, psmouse->phys);
276 		}
277 		break;
278 
279 	case PSMOUSE_GOOD_DATA:
280 		break;
281 	}
282 	return 0;
283 }
284 
285 /*
286  * psmouse_interrupt() handles incoming characters, either passing them
287  * for normal processing or gathering them as command response.
288  */
289 static irqreturn_t psmouse_interrupt(struct serio *serio,
290 		unsigned char data, unsigned int flags)
291 {
292 	struct psmouse *psmouse = serio_get_drvdata(serio);
293 
294 	if (psmouse->state == PSMOUSE_IGNORE)
295 		goto out;
296 
297 	if (unlikely((flags & SERIO_TIMEOUT) ||
298 		     ((flags & SERIO_PARITY) && !psmouse->ignore_parity))) {
299 
300 		if (psmouse->state == PSMOUSE_ACTIVATED)
301 			psmouse_warn(psmouse,
302 				     "bad data from KBC -%s%s\n",
303 				     flags & SERIO_TIMEOUT ? " timeout" : "",
304 				     flags & SERIO_PARITY ? " bad parity" : "");
305 		ps2_cmd_aborted(&psmouse->ps2dev);
306 		goto out;
307 	}
308 
309 	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
310 		if  (ps2_handle_ack(&psmouse->ps2dev, data))
311 			goto out;
312 
313 	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
314 		if  (ps2_handle_response(&psmouse->ps2dev, data))
315 			goto out;
316 
317 	if (psmouse->state <= PSMOUSE_RESYNCING)
318 		goto out;
319 
320 	if (psmouse->state == PSMOUSE_ACTIVATED &&
321 	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
322 		psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
323 			     psmouse->name, psmouse->phys, psmouse->pktcnt);
324 		psmouse->badbyte = psmouse->packet[0];
325 		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
326 		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
327 		goto out;
328 	}
329 
330 	psmouse->packet[psmouse->pktcnt++] = data;
331 
332 	/* Check if this is a new device announcement (0xAA 0x00) */
333 	if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
334 		if (psmouse->pktcnt == 1) {
335 			psmouse->last = jiffies;
336 			goto out;
337 		}
338 
339 		if (psmouse->packet[1] == PSMOUSE_RET_ID ||
340 		    (psmouse->type == PSMOUSE_HGPK &&
341 		     psmouse->packet[1] == PSMOUSE_RET_BAT)) {
342 			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
343 			serio_reconnect(serio);
344 			goto out;
345 		}
346 
347 		/* Not a new device, try processing first byte normally */
348 		psmouse->pktcnt = 1;
349 		if (psmouse_handle_byte(psmouse))
350 			goto out;
351 
352 		psmouse->packet[psmouse->pktcnt++] = data;
353 	}
354 
355 	/*
356 	 * See if we need to force resync because mouse was idle for
357 	 * too long.
358 	 */
359 	if (psmouse->state == PSMOUSE_ACTIVATED &&
360 	    psmouse->pktcnt == 1 && psmouse->resync_time &&
361 	    time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
362 		psmouse->badbyte = psmouse->packet[0];
363 		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
364 		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
365 		goto out;
366 	}
367 
368 	psmouse->last = jiffies;
369 	psmouse_handle_byte(psmouse);
370 
371  out:
372 	return IRQ_HANDLED;
373 }
374 
375 /*
376  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
377  * using sliced syntax, understood by advanced devices, such as Logitech
378  * or Synaptics touchpads. The command is encoded as:
379  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
380  * is the command.
381  */
382 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
383 {
384 	int i;
385 
386 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
387 		return -1;
388 
389 	for (i = 6; i >= 0; i -= 2) {
390 		unsigned char d = (command >> i) & 3;
391 		if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
392 			return -1;
393 	}
394 
395 	return 0;
396 }
397 
398 /*
399  * psmouse_reset() resets the mouse into power-on state.
400  */
401 int psmouse_reset(struct psmouse *psmouse)
402 {
403 	unsigned char param[2];
404 
405 	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
406 		return -1;
407 
408 	if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
409 		return -1;
410 
411 	return 0;
412 }
413 
414 /*
415  * Here we set the mouse resolution.
416  */
417 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
418 {
419 	static const unsigned char params[] = { 0, 1, 2, 2, 3 };
420 	unsigned char p;
421 
422 	if (resolution == 0 || resolution > 200)
423 		resolution = 200;
424 
425 	p = params[resolution / 50];
426 	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
427 	psmouse->resolution = 25 << p;
428 }
429 
430 /*
431  * Here we set the mouse report rate.
432  */
433 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
434 {
435 	static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
436 	unsigned char r;
437 	int i = 0;
438 
439 	while (rates[i] > rate) i++;
440 	r = rates[i];
441 	ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
442 	psmouse->rate = r;
443 }
444 
445 /*
446  * Here we set the mouse scaling.
447  */
448 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
449 {
450 	ps2_command(&psmouse->ps2dev, NULL,
451 		    scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
452 					       PSMOUSE_CMD_SETSCALE11);
453 }
454 
455 /*
456  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
457  */
458 static int psmouse_poll(struct psmouse *psmouse)
459 {
460 	return ps2_command(&psmouse->ps2dev, psmouse->packet,
461 			   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
462 }
463 
464 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
465 {
466 	int i;
467 
468 	for (i = 0; ids[i]; i++)
469 		if (!strcasecmp(id, ids[i]))
470 			return true;
471 
472 	return false;
473 }
474 
475 /*
476  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
477  */
478 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
479 {
480 	struct serio *serio = psmouse->ps2dev.serio;
481 	char *p, *fw_id_copy, *save_ptr;
482 	bool found = false;
483 
484 	if (strncmp(serio->firmware_id, "PNP: ", 5))
485 		return false;
486 
487 	fw_id_copy = kstrndup(&serio->firmware_id[5],
488 			      sizeof(serio->firmware_id) - 5,
489 			      GFP_KERNEL);
490 	if (!fw_id_copy)
491 		return false;
492 
493 	save_ptr = fw_id_copy;
494 	while ((p = strsep(&fw_id_copy, " ")) != NULL) {
495 		if (psmouse_check_pnp_id(p, ids)) {
496 			found = true;
497 			break;
498 		}
499 	}
500 
501 	kfree(save_ptr);
502 	return found;
503 }
504 
505 /*
506  * Genius NetMouse magic init.
507  */
508 static int genius_detect(struct psmouse *psmouse, bool set_properties)
509 {
510 	struct ps2dev *ps2dev = &psmouse->ps2dev;
511 	unsigned char param[4];
512 
513 	param[0] = 3;
514 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
515 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
516 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
517 	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
518 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
519 
520 	if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
521 		return -1;
522 
523 	if (set_properties) {
524 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
525 		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
526 		__set_bit(BTN_SIDE, psmouse->dev->keybit);
527 		__set_bit(REL_WHEEL, psmouse->dev->relbit);
528 
529 		psmouse->vendor = "Genius";
530 		psmouse->name = "Mouse";
531 		psmouse->pktsize = 4;
532 	}
533 
534 	return 0;
535 }
536 
537 /*
538  * IntelliMouse magic init.
539  */
540 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
541 {
542 	struct ps2dev *ps2dev = &psmouse->ps2dev;
543 	unsigned char param[2];
544 
545 	param[0] = 200;
546 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
547 	param[0] = 100;
548 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
549 	param[0] =  80;
550 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
551 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
552 
553 	if (param[0] != 3)
554 		return -1;
555 
556 	if (set_properties) {
557 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
558 		__set_bit(REL_WHEEL, psmouse->dev->relbit);
559 
560 		if (!psmouse->vendor)
561 			psmouse->vendor = "Generic";
562 		if (!psmouse->name)
563 			psmouse->name = "Wheel Mouse";
564 		psmouse->pktsize = 4;
565 	}
566 
567 	return 0;
568 }
569 
570 /*
571  * Try IntelliMouse/Explorer magic init.
572  */
573 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
574 {
575 	struct ps2dev *ps2dev = &psmouse->ps2dev;
576 	unsigned char param[2];
577 
578 	intellimouse_detect(psmouse, 0);
579 
580 	param[0] = 200;
581 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
582 	param[0] = 200;
583 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
584 	param[0] =  80;
585 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
586 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
587 
588 	if (param[0] != 4)
589 		return -1;
590 
591 	/* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
592 	param[0] = 200;
593 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
594 	param[0] =  80;
595 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
596 	param[0] =  40;
597 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
598 
599 	if (set_properties) {
600 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
601 		__set_bit(REL_WHEEL, psmouse->dev->relbit);
602 		__set_bit(REL_HWHEEL, psmouse->dev->relbit);
603 		__set_bit(BTN_SIDE, psmouse->dev->keybit);
604 		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
605 
606 		if (!psmouse->vendor)
607 			psmouse->vendor = "Generic";
608 		if (!psmouse->name)
609 			psmouse->name = "Explorer Mouse";
610 		psmouse->pktsize = 4;
611 	}
612 
613 	return 0;
614 }
615 
616 /*
617  * Kensington ThinkingMouse / ExpertMouse magic init.
618  */
619 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
620 {
621 	struct ps2dev *ps2dev = &psmouse->ps2dev;
622 	unsigned char param[2];
623 	static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
624 	int i;
625 
626 	param[0] = 10;
627 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
628 	param[0] = 0;
629 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
630 	for (i = 0; i < ARRAY_SIZE(seq); i++) {
631 		param[0] = seq[i];
632 		ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
633 	}
634 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
635 
636 	if (param[0] != 2)
637 		return -1;
638 
639 	if (set_properties) {
640 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
641 		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
642 
643 		psmouse->vendor = "Kensington";
644 		psmouse->name = "ThinkingMouse";
645 	}
646 
647 	return 0;
648 }
649 
650 /*
651  * Bare PS/2 protocol "detection". Always succeeds.
652  */
653 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
654 {
655 	if (set_properties) {
656 		if (!psmouse->vendor)
657 			psmouse->vendor = "Generic";
658 		if (!psmouse->name)
659 			psmouse->name = "Mouse";
660 
661 		/*
662 		 * We have no way of figuring true number of buttons so let's
663 		 * assume that the device has 3.
664 		 */
665 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
666 	}
667 
668 	return 0;
669 }
670 
671 /*
672  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
673  * must be forced by sysfs protocol writing.
674  */
675 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
676 {
677 	if (set_properties) {
678 		psmouse->vendor = "Cortron";
679 		psmouse->name = "PS/2 Trackball";
680 
681 		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
682 		__set_bit(BTN_SIDE, psmouse->dev->keybit);
683 	}
684 
685 	return 0;
686 }
687 
688 static const struct psmouse_protocol psmouse_protocols[] = {
689 	{
690 		.type		= PSMOUSE_PS2,
691 		.name		= "PS/2",
692 		.alias		= "bare",
693 		.maxproto	= true,
694 		.ignore_parity	= true,
695 		.detect		= ps2bare_detect,
696 		.try_passthru	= true,
697 	},
698 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
699 	{
700 		.type		= PSMOUSE_PS2PP,
701 		.name		= "PS2++",
702 		.alias		= "logitech",
703 		.detect		= ps2pp_detect,
704 	},
705 #endif
706 	{
707 		.type		= PSMOUSE_THINKPS,
708 		.name		= "ThinkPS/2",
709 		.alias		= "thinkps",
710 		.detect		= thinking_detect,
711 	},
712 #ifdef CONFIG_MOUSE_PS2_CYPRESS
713 	{
714 		.type		= PSMOUSE_CYPRESS,
715 		.name		= "CyPS/2",
716 		.alias		= "cypress",
717 		.detect		= cypress_detect,
718 		.init		= cypress_init,
719 	},
720 #endif
721 	{
722 		.type		= PSMOUSE_GENPS,
723 		.name		= "GenPS/2",
724 		.alias		= "genius",
725 		.detect		= genius_detect,
726 	},
727 	{
728 		.type		= PSMOUSE_IMPS,
729 		.name		= "ImPS/2",
730 		.alias		= "imps",
731 		.maxproto	= true,
732 		.ignore_parity	= true,
733 		.detect		= intellimouse_detect,
734 		.try_passthru	= true,
735 	},
736 	{
737 		.type		= PSMOUSE_IMEX,
738 		.name		= "ImExPS/2",
739 		.alias		= "exps",
740 		.maxproto	= true,
741 		.ignore_parity	= true,
742 		.detect		= im_explorer_detect,
743 		.try_passthru	= true,
744 	},
745 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
746 	{
747 		.type		= PSMOUSE_SYNAPTICS,
748 		.name		= "SynPS/2",
749 		.alias		= "synaptics",
750 		.detect		= synaptics_detect,
751 		.init		= synaptics_init,
752 	},
753 	{
754 		.type		= PSMOUSE_SYNAPTICS_RELATIVE,
755 		.name		= "SynRelPS/2",
756 		.alias		= "synaptics-relative",
757 		.detect		= synaptics_detect,
758 		.init		= synaptics_init_relative,
759 	},
760 #endif
761 #ifdef CONFIG_MOUSE_PS2_ALPS
762 	{
763 		.type		= PSMOUSE_ALPS,
764 		.name		= "AlpsPS/2",
765 		.alias		= "alps",
766 		.detect		= alps_detect,
767 		.init		= alps_init,
768 	},
769 #endif
770 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
771 	{
772 		.type		= PSMOUSE_LIFEBOOK,
773 		.name		= "LBPS/2",
774 		.alias		= "lifebook",
775 		.detect		= lifebook_detect,
776 		.init		= lifebook_init,
777 	},
778 #endif
779 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
780 	{
781 		.type		= PSMOUSE_TRACKPOINT,
782 		.name		= "TPPS/2",
783 		.alias		= "trackpoint",
784 		.detect		= trackpoint_detect,
785 		.try_passthru	= true,
786 	},
787 #endif
788 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
789 	{
790 		.type		= PSMOUSE_TOUCHKIT_PS2,
791 		.name		= "touchkitPS/2",
792 		.alias		= "touchkit",
793 		.detect		= touchkit_ps2_detect,
794 	},
795 #endif
796 #ifdef CONFIG_MOUSE_PS2_OLPC
797 	{
798 		.type		= PSMOUSE_HGPK,
799 		.name		= "OLPC HGPK",
800 		.alias		= "hgpk",
801 		.detect		= hgpk_detect,
802 	},
803 #endif
804 #ifdef CONFIG_MOUSE_PS2_ELANTECH
805 	{
806 		.type		= PSMOUSE_ELANTECH,
807 		.name		= "ETPS/2",
808 		.alias		= "elantech",
809 		.detect		= elantech_detect,
810 		.init		= elantech_init,
811 	},
812 #endif
813 #ifdef CONFIG_MOUSE_PS2_SENTELIC
814 	{
815 		.type		= PSMOUSE_FSP,
816 		.name		= "FSPPS/2",
817 		.alias		= "fsp",
818 		.detect		= fsp_detect,
819 		.init		= fsp_init,
820 	},
821 #endif
822 	{
823 		.type		= PSMOUSE_CORTRON,
824 		.name		= "CortronPS/2",
825 		.alias		= "cortps",
826 		.detect		= cortron_detect,
827 	},
828 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
829 	{
830 		.type		= PSMOUSE_FOCALTECH,
831 		.name		= "FocalTechPS/2",
832 		.alias		= "focaltech",
833 		.detect		= focaltech_detect,
834 		.init		= focaltech_init,
835 	},
836 #endif
837 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
838 	{
839 		.type		= PSMOUSE_VMMOUSE,
840 		.name		= VMMOUSE_PSNAME,
841 		.alias		= "vmmouse",
842 		.detect		= vmmouse_detect,
843 		.init		= vmmouse_init,
844 	},
845 #endif
846 #ifdef CONFIG_MOUSE_PS2_BYD
847 	{
848 		.type		= PSMOUSE_BYD,
849 		.name		= "BYDPS/2",
850 		.alias		= "byd",
851 		.detect		= byd_detect,
852 		.init		= byd_init,
853 	},
854 #endif
855 	{
856 		.type		= PSMOUSE_AUTO,
857 		.name		= "auto",
858 		.alias		= "any",
859 		.maxproto	= true,
860 	},
861 };
862 
863 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
864 {
865 	int i;
866 
867 	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
868 		if (psmouse_protocols[i].type == type)
869 			return &psmouse_protocols[i];
870 
871 	return NULL;
872 }
873 
874 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
875 {
876 	const struct psmouse_protocol *proto;
877 
878 	proto = __psmouse_protocol_by_type(type);
879 	if (proto)
880 		return proto;
881 
882 	WARN_ON(1);
883 	return &psmouse_protocols[0];
884 }
885 
886 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
887 {
888 	const struct psmouse_protocol *p;
889 	int i;
890 
891 	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
892 		p = &psmouse_protocols[i];
893 
894 		if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
895 		    (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
896 			return &psmouse_protocols[i];
897 	}
898 
899 	return NULL;
900 }
901 
902 /*
903  * Apply default settings to the psmouse structure. Most of them will
904  * be overridden by individual protocol initialization routines.
905  */
906 static void psmouse_apply_defaults(struct psmouse *psmouse)
907 {
908 	struct input_dev *input_dev = psmouse->dev;
909 
910 	memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
911 	memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
912 	memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
913 	memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
914 	memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
915 
916 	__set_bit(EV_KEY, input_dev->evbit);
917 	__set_bit(EV_REL, input_dev->evbit);
918 
919 	__set_bit(BTN_LEFT, input_dev->keybit);
920 	__set_bit(BTN_RIGHT, input_dev->keybit);
921 
922 	__set_bit(REL_X, input_dev->relbit);
923 	__set_bit(REL_Y, input_dev->relbit);
924 
925 	__set_bit(INPUT_PROP_POINTER, input_dev->propbit);
926 
927 	psmouse->set_rate = psmouse_set_rate;
928 	psmouse->set_resolution = psmouse_set_resolution;
929 	psmouse->set_scale = psmouse_set_scale;
930 	psmouse->poll = psmouse_poll;
931 	psmouse->protocol_handler = psmouse_process_byte;
932 	psmouse->pktsize = 3;
933 	psmouse->reconnect = NULL;
934 	psmouse->disconnect = NULL;
935 	psmouse->cleanup = NULL;
936 	psmouse->pt_activate = NULL;
937 	psmouse->pt_deactivate = NULL;
938 }
939 
940 static bool psmouse_try_protocol(struct psmouse *psmouse,
941 				 enum psmouse_type type,
942 				 unsigned int *max_proto,
943 				 bool set_properties, bool init_allowed)
944 {
945 	const struct psmouse_protocol *proto;
946 
947 	proto = __psmouse_protocol_by_type(type);
948 	if (!proto)
949 		return false;
950 
951 	if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
952 	    !proto->try_passthru) {
953 		return false;
954 	}
955 
956 	if (set_properties)
957 		psmouse_apply_defaults(psmouse);
958 
959 	if (proto->detect(psmouse, set_properties) != 0)
960 		return false;
961 
962 	if (set_properties && proto->init && init_allowed) {
963 		if (proto->init(psmouse) != 0) {
964 			/*
965 			 * We detected device, but init failed. Adjust
966 			 * max_proto so we only try standard protocols.
967 			 */
968 			if (*max_proto > PSMOUSE_IMEX)
969 				*max_proto = PSMOUSE_IMEX;
970 
971 			return false;
972 		}
973 	}
974 
975 	return true;
976 }
977 
978 /*
979  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
980  * the mouse may have.
981  */
982 static int psmouse_extensions(struct psmouse *psmouse,
983 			      unsigned int max_proto, bool set_properties)
984 {
985 	bool synaptics_hardware = false;
986 
987 	/*
988 	 * Always check for focaltech, this is safe as it uses pnp-id
989 	 * matching.
990 	 */
991 	if (psmouse_try_protocol(psmouse, PSMOUSE_FOCALTECH,
992 				 &max_proto, set_properties, false)) {
993 		if (max_proto > PSMOUSE_IMEX &&
994 		    IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
995 		    (!set_properties || focaltech_init(psmouse) == 0)) {
996 			return PSMOUSE_FOCALTECH;
997 		}
998 		/*
999 		 * Restrict psmouse_max_proto so that psmouse_initialize()
1000 		 * does not try to reset rate and resolution, because even
1001 		 * that upsets the device.
1002 		 * This also causes us to basically fall through to basic
1003 		 * protocol detection, where we fully reset the mouse,
1004 		 * and set it up as bare PS/2 protocol device.
1005 		 */
1006 		psmouse_max_proto = max_proto = PSMOUSE_PS2;
1007 	}
1008 
1009 	/*
1010 	 * We always check for LifeBook because it does not disturb mouse
1011 	 * (it only checks DMI information).
1012 	 */
1013 	if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1014 				 set_properties, max_proto > PSMOUSE_IMEX))
1015 		return PSMOUSE_LIFEBOOK;
1016 
1017 	if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1018 				 set_properties, max_proto > PSMOUSE_IMEX))
1019 		return PSMOUSE_VMMOUSE;
1020 
1021 	/*
1022 	 * Try Kensington ThinkingMouse (we try first, because Synaptics
1023 	 * probe upsets the ThinkingMouse).
1024 	 */
1025 	if (max_proto > PSMOUSE_IMEX &&
1026 	    psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1027 				 set_properties, true)) {
1028 		return PSMOUSE_THINKPS;
1029 	}
1030 
1031 	/*
1032 	 * Try Synaptics TouchPad. Note that probing is done even if
1033 	 * Synaptics protocol support is disabled in config - we need to
1034 	 * know if it is Synaptics so we can reset it properly after
1035 	 * probing for IntelliMouse.
1036 	 */
1037 	if (max_proto > PSMOUSE_PS2 &&
1038 	    psmouse_try_protocol(psmouse, PSMOUSE_SYNAPTICS, &max_proto,
1039 				 set_properties, false)) {
1040 		synaptics_hardware = true;
1041 
1042 		if (max_proto > PSMOUSE_IMEX) {
1043 			/*
1044 			 * Try activating protocol, but check if support is
1045 			 * enabled first, since we try detecting Synaptics
1046 			 * even when protocol is disabled.
1047 			 */
1048 			if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) &&
1049 			    (!set_properties || synaptics_init(psmouse) == 0)) {
1050 				return PSMOUSE_SYNAPTICS;
1051 			}
1052 
1053 			/*
1054 			 * Some Synaptics touchpads can emulate extended
1055 			 * protocols (like IMPS/2).  Unfortunately
1056 			 * Logitech/Genius probes confuse some firmware
1057 			 * versions so we'll have to skip them.
1058 			 */
1059 			max_proto = PSMOUSE_IMEX;
1060 		}
1061 
1062 		/*
1063 		 * Make sure that touchpad is in relative mode, gestures
1064 		 * (taps) are enabled.
1065 		 */
1066 		synaptics_reset(psmouse);
1067 	}
1068 
1069 	/*
1070 	 * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1071 	 * because Finger Sensing Pad probe upsets some modules of Cypress
1072 	 * Trackpads.
1073 	 */
1074 	if (max_proto > PSMOUSE_IMEX &&
1075 	    psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1076 				 set_properties, true)) {
1077 		return PSMOUSE_CYPRESS;
1078 	}
1079 
1080 	/* Try ALPS TouchPad */
1081 	if (max_proto > PSMOUSE_IMEX) {
1082 		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1083 		if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1084 					 &max_proto, set_properties, true))
1085 			return PSMOUSE_ALPS;
1086 	}
1087 
1088 	/* Try OLPC HGPK touchpad */
1089 	if (max_proto > PSMOUSE_IMEX &&
1090 	    psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1091 				 set_properties, true)) {
1092 		return PSMOUSE_HGPK;
1093 	}
1094 
1095 	/* Try Elantech touchpad */
1096 	if (max_proto > PSMOUSE_IMEX &&
1097 	    psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1098 				 &max_proto, set_properties, true)) {
1099 		return PSMOUSE_ELANTECH;
1100 	}
1101 
1102 	if (max_proto > PSMOUSE_IMEX) {
1103 		if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1104 					 &max_proto, set_properties, true))
1105 			return PSMOUSE_GENPS;
1106 
1107 		if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1108 					 &max_proto, set_properties, true))
1109 			return PSMOUSE_PS2PP;
1110 
1111 		if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1112 					 &max_proto, set_properties, true))
1113 			return PSMOUSE_TRACKPOINT;
1114 
1115 		if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1116 					 &max_proto, set_properties, true))
1117 			return PSMOUSE_TOUCHKIT_PS2;
1118 
1119 		if (psmouse_try_protocol(psmouse, PSMOUSE_BYD,
1120 					 &max_proto, set_properties, true))
1121 			return PSMOUSE_BYD;
1122 	}
1123 
1124 	/*
1125 	 * Try Finger Sensing Pad. We do it here because its probe upsets
1126 	 * Trackpoint devices (causing TP_READ_ID command to time out).
1127 	 */
1128 	if (max_proto > PSMOUSE_IMEX &&
1129 	    psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1130 				 &max_proto, set_properties, true)) {
1131 		return PSMOUSE_FSP;
1132 	}
1133 
1134 	/*
1135 	 * Reset to defaults in case the device got confused by extended
1136 	 * protocol probes. Note that we follow up with full reset because
1137 	 * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1138 	 */
1139 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1140 	psmouse_reset(psmouse);
1141 
1142 	if (max_proto >= PSMOUSE_IMEX &&
1143 	    psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1144 				 &max_proto, set_properties, true)) {
1145 		return PSMOUSE_IMEX;
1146 	}
1147 
1148 	if (max_proto >= PSMOUSE_IMPS &&
1149 	    psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1150 				 &max_proto, set_properties, true)) {
1151 		return PSMOUSE_IMPS;
1152 	}
1153 
1154 	/*
1155 	 * Okay, all failed, we have a standard mouse here. The number of
1156 	 * the buttons is still a question, though. We assume 3.
1157 	 */
1158 	psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1159 			     &max_proto, set_properties, true);
1160 
1161 	if (synaptics_hardware) {
1162 		/*
1163 		 * We detected Synaptics hardware but it did not respond to
1164 		 * IMPS/2 probes.  We need to reset the touchpad because if
1165 		 * there is a track point on the pass through port it could
1166 		 * get disabled while probing for protocol extensions.
1167 		 */
1168 		psmouse_reset(psmouse);
1169 	}
1170 
1171 	return PSMOUSE_PS2;
1172 }
1173 
1174 /*
1175  * psmouse_probe() probes for a PS/2 mouse.
1176  */
1177 static int psmouse_probe(struct psmouse *psmouse)
1178 {
1179 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1180 	unsigned char param[2];
1181 
1182 	/*
1183 	 * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1184 	 * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1185 	 * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1186 	 * subsequent ID queries, probably due to a firmware bug.
1187 	 */
1188 	param[0] = 0xa5;
1189 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
1190 		return -1;
1191 
1192 	if (param[0] != 0x00 && param[0] != 0x03 &&
1193 	    param[0] != 0x04 && param[0] != 0xff)
1194 		return -1;
1195 
1196 	/*
1197 	 * Then we reset and disable the mouse so that it doesn't generate
1198 	 * events.
1199 	 */
1200 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
1201 		psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
1202 			     ps2dev->serio->phys);
1203 
1204 	return 0;
1205 }
1206 
1207 /*
1208  * psmouse_initialize() initializes the mouse to a sane state.
1209  */
1210 static void psmouse_initialize(struct psmouse *psmouse)
1211 {
1212 	/*
1213 	 * We set the mouse report rate, resolution and scaling.
1214 	 */
1215 	if (psmouse_max_proto != PSMOUSE_PS2) {
1216 		psmouse->set_rate(psmouse, psmouse->rate);
1217 		psmouse->set_resolution(psmouse, psmouse->resolution);
1218 		psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1219 	}
1220 }
1221 
1222 /*
1223  * psmouse_activate() enables the mouse so that we get motion reports from it.
1224  */
1225 int psmouse_activate(struct psmouse *psmouse)
1226 {
1227 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1228 		psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1229 			     psmouse->ps2dev.serio->phys);
1230 		return -1;
1231 	}
1232 
1233 	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1234 	return 0;
1235 }
1236 
1237 /*
1238  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1239  * motion reports from it unless we explicitly request it.
1240  */
1241 int psmouse_deactivate(struct psmouse *psmouse)
1242 {
1243 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
1244 		psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
1245 			     psmouse->ps2dev.serio->phys);
1246 		return -1;
1247 	}
1248 
1249 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1250 	return 0;
1251 }
1252 
1253 /*
1254  * psmouse_resync() attempts to re-validate current protocol.
1255  */
1256 static void psmouse_resync(struct work_struct *work)
1257 {
1258 	struct psmouse *parent = NULL, *psmouse =
1259 		container_of(work, struct psmouse, resync_work.work);
1260 	struct serio *serio = psmouse->ps2dev.serio;
1261 	psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1262 	bool failed = false, enabled = false;
1263 	int i;
1264 
1265 	mutex_lock(&psmouse_mutex);
1266 
1267 	if (psmouse->state != PSMOUSE_RESYNCING)
1268 		goto out;
1269 
1270 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1271 		parent = serio_get_drvdata(serio->parent);
1272 		psmouse_deactivate(parent);
1273 	}
1274 
1275 	/*
1276 	 * Some mice don't ACK commands sent while they are in the middle of
1277 	 * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1278 	 * instead of ps2_command() which would wait for 200ms for an ACK
1279 	 * that may never come.
1280 	 * As an additional quirk ALPS touchpads may not only forget to ACK
1281 	 * disable command but will stop reporting taps, so if we see that
1282 	 * mouse at least once ACKs disable we will do full reconnect if ACK
1283 	 * is missing.
1284 	 */
1285 	psmouse->num_resyncs++;
1286 
1287 	if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1288 		if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1289 			failed = true;
1290 	} else
1291 		psmouse->acks_disable_command = true;
1292 
1293 	/*
1294 	 * Poll the mouse. If it was reset the packet will be shorter than
1295 	 * psmouse->pktsize and ps2_command will fail. We do not expect and
1296 	 * do not handle scenario when mouse "upgrades" its protocol while
1297 	 * disconnected since it would require additional delay. If we ever
1298 	 * see a mouse that does it we'll adjust the code.
1299 	 */
1300 	if (!failed) {
1301 		if (psmouse->poll(psmouse))
1302 			failed = true;
1303 		else {
1304 			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1305 			for (i = 0; i < psmouse->pktsize; i++) {
1306 				psmouse->pktcnt++;
1307 				rc = psmouse->protocol_handler(psmouse);
1308 				if (rc != PSMOUSE_GOOD_DATA)
1309 					break;
1310 			}
1311 			if (rc != PSMOUSE_FULL_PACKET)
1312 				failed = true;
1313 			psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1314 		}
1315 	}
1316 
1317 	/*
1318 	 * Now try to enable mouse. We try to do that even if poll failed
1319 	 * and also repeat our attempts 5 times, otherwise we may be left
1320 	 * out with disabled mouse.
1321 	 */
1322 	for (i = 0; i < 5; i++) {
1323 		if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1324 			enabled = true;
1325 			break;
1326 		}
1327 		msleep(200);
1328 	}
1329 
1330 	if (!enabled) {
1331 		psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1332 			     psmouse->ps2dev.serio->phys);
1333 		failed = true;
1334 	}
1335 
1336 	if (failed) {
1337 		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1338 		psmouse_info(psmouse,
1339 			     "resync failed, issuing reconnect request\n");
1340 		serio_reconnect(serio);
1341 	} else
1342 		psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1343 
1344 	if (parent)
1345 		psmouse_activate(parent);
1346  out:
1347 	mutex_unlock(&psmouse_mutex);
1348 }
1349 
1350 /*
1351  * psmouse_cleanup() resets the mouse into power-on state.
1352  */
1353 static void psmouse_cleanup(struct serio *serio)
1354 {
1355 	struct psmouse *psmouse = serio_get_drvdata(serio);
1356 	struct psmouse *parent = NULL;
1357 
1358 	mutex_lock(&psmouse_mutex);
1359 
1360 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1361 		parent = serio_get_drvdata(serio->parent);
1362 		psmouse_deactivate(parent);
1363 	}
1364 
1365 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1366 
1367 	/*
1368 	 * Disable stream mode so cleanup routine can proceed undisturbed.
1369 	 */
1370 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1371 		psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1372 			     psmouse->ps2dev.serio->phys);
1373 
1374 	if (psmouse->cleanup)
1375 		psmouse->cleanup(psmouse);
1376 
1377 	/*
1378 	 * Reset the mouse to defaults (bare PS/2 protocol).
1379 	 */
1380 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1381 
1382 	/*
1383 	 * Some boxes, such as HP nx7400, get terribly confused if mouse
1384 	 * is not fully enabled before suspending/shutting down.
1385 	 */
1386 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1387 
1388 	if (parent) {
1389 		if (parent->pt_deactivate)
1390 			parent->pt_deactivate(parent);
1391 
1392 		psmouse_activate(parent);
1393 	}
1394 
1395 	mutex_unlock(&psmouse_mutex);
1396 }
1397 
1398 /*
1399  * psmouse_disconnect() closes and frees.
1400  */
1401 static void psmouse_disconnect(struct serio *serio)
1402 {
1403 	struct psmouse *psmouse, *parent = NULL;
1404 
1405 	psmouse = serio_get_drvdata(serio);
1406 
1407 	sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1408 
1409 	mutex_lock(&psmouse_mutex);
1410 
1411 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1412 
1413 	/* make sure we don't have a resync in progress */
1414 	mutex_unlock(&psmouse_mutex);
1415 	flush_workqueue(kpsmoused_wq);
1416 	mutex_lock(&psmouse_mutex);
1417 
1418 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1419 		parent = serio_get_drvdata(serio->parent);
1420 		psmouse_deactivate(parent);
1421 	}
1422 
1423 	if (psmouse->disconnect)
1424 		psmouse->disconnect(psmouse);
1425 
1426 	if (parent && parent->pt_deactivate)
1427 		parent->pt_deactivate(parent);
1428 
1429 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1430 
1431 	serio_close(serio);
1432 	serio_set_drvdata(serio, NULL);
1433 	input_unregister_device(psmouse->dev);
1434 	kfree(psmouse);
1435 
1436 	if (parent)
1437 		psmouse_activate(parent);
1438 
1439 	mutex_unlock(&psmouse_mutex);
1440 }
1441 
1442 static int psmouse_switch_protocol(struct psmouse *psmouse,
1443 				   const struct psmouse_protocol *proto)
1444 {
1445 	const struct psmouse_protocol *selected_proto;
1446 	struct input_dev *input_dev = psmouse->dev;
1447 
1448 	input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1449 
1450 	if (proto && (proto->detect || proto->init)) {
1451 		psmouse_apply_defaults(psmouse);
1452 
1453 		if (proto->detect && proto->detect(psmouse, true) < 0)
1454 			return -1;
1455 
1456 		if (proto->init && proto->init(psmouse) < 0)
1457 			return -1;
1458 
1459 		psmouse->type = proto->type;
1460 		selected_proto = proto;
1461 	} else {
1462 		psmouse->type = psmouse_extensions(psmouse,
1463 						   psmouse_max_proto, true);
1464 		selected_proto = psmouse_protocol_by_type(psmouse->type);
1465 	}
1466 
1467 	psmouse->ignore_parity = selected_proto->ignore_parity;
1468 
1469 	/*
1470 	 * If mouse's packet size is 3 there is no point in polling the
1471 	 * device in hopes to detect protocol reset - we won't get less
1472 	 * than 3 bytes response anyhow.
1473 	 */
1474 	if (psmouse->pktsize == 3)
1475 		psmouse->resync_time = 0;
1476 
1477 	/*
1478 	 * Some smart KVMs fake response to POLL command returning just
1479 	 * 3 bytes and messing up our resync logic, so if initial poll
1480 	 * fails we won't try polling the device anymore. Hopefully
1481 	 * such KVM will maintain initially selected protocol.
1482 	 */
1483 	if (psmouse->resync_time && psmouse->poll(psmouse))
1484 		psmouse->resync_time = 0;
1485 
1486 	snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1487 		 selected_proto->name, psmouse->vendor, psmouse->name);
1488 
1489 	input_dev->name = psmouse->devname;
1490 	input_dev->phys = psmouse->phys;
1491 	input_dev->id.bustype = BUS_I8042;
1492 	input_dev->id.vendor = 0x0002;
1493 	input_dev->id.product = psmouse->type;
1494 	input_dev->id.version = psmouse->model;
1495 
1496 	return 0;
1497 }
1498 
1499 /*
1500  * psmouse_connect() is a callback from the serio module when
1501  * an unhandled serio port is found.
1502  */
1503 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1504 {
1505 	struct psmouse *psmouse, *parent = NULL;
1506 	struct input_dev *input_dev;
1507 	int retval = 0, error = -ENOMEM;
1508 
1509 	mutex_lock(&psmouse_mutex);
1510 
1511 	/*
1512 	 * If this is a pass-through port deactivate parent so the device
1513 	 * connected to this port can be successfully identified
1514 	 */
1515 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1516 		parent = serio_get_drvdata(serio->parent);
1517 		psmouse_deactivate(parent);
1518 	}
1519 
1520 	psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1521 	input_dev = input_allocate_device();
1522 	if (!psmouse || !input_dev)
1523 		goto err_free;
1524 
1525 	ps2_init(&psmouse->ps2dev, serio);
1526 	INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1527 	psmouse->dev = input_dev;
1528 	snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1529 
1530 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1531 
1532 	serio_set_drvdata(serio, psmouse);
1533 
1534 	error = serio_open(serio, drv);
1535 	if (error)
1536 		goto err_clear_drvdata;
1537 
1538 	/* give PT device some time to settle down before probing */
1539 	if (serio->id.type == SERIO_PS_PSTHRU)
1540 		usleep_range(10000, 15000);
1541 
1542 	if (psmouse_probe(psmouse) < 0) {
1543 		error = -ENODEV;
1544 		goto err_close_serio;
1545 	}
1546 
1547 	psmouse->rate = psmouse_rate;
1548 	psmouse->resolution = psmouse_resolution;
1549 	psmouse->resetafter = psmouse_resetafter;
1550 	psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1551 	psmouse->smartscroll = psmouse_smartscroll;
1552 
1553 	psmouse_switch_protocol(psmouse, NULL);
1554 
1555 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1556 	psmouse_initialize(psmouse);
1557 
1558 	error = input_register_device(psmouse->dev);
1559 	if (error)
1560 		goto err_protocol_disconnect;
1561 
1562 	if (parent && parent->pt_activate)
1563 		parent->pt_activate(parent);
1564 
1565 	error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1566 	if (error)
1567 		goto err_pt_deactivate;
1568 
1569 	psmouse_activate(psmouse);
1570 
1571  out:
1572 	/* If this is a pass-through port the parent needs to be re-activated */
1573 	if (parent)
1574 		psmouse_activate(parent);
1575 
1576 	mutex_unlock(&psmouse_mutex);
1577 	return retval;
1578 
1579  err_pt_deactivate:
1580 	if (parent && parent->pt_deactivate)
1581 		parent->pt_deactivate(parent);
1582 	input_unregister_device(psmouse->dev);
1583 	input_dev = NULL; /* so we don't try to free it below */
1584  err_protocol_disconnect:
1585 	if (psmouse->disconnect)
1586 		psmouse->disconnect(psmouse);
1587 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1588  err_close_serio:
1589 	serio_close(serio);
1590  err_clear_drvdata:
1591 	serio_set_drvdata(serio, NULL);
1592  err_free:
1593 	input_free_device(input_dev);
1594 	kfree(psmouse);
1595 
1596 	retval = error;
1597 	goto out;
1598 }
1599 
1600 static int psmouse_reconnect(struct serio *serio)
1601 {
1602 	struct psmouse *psmouse = serio_get_drvdata(serio);
1603 	struct psmouse *parent = NULL;
1604 	unsigned char type;
1605 	int rc = -1;
1606 
1607 	mutex_lock(&psmouse_mutex);
1608 
1609 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1610 		parent = serio_get_drvdata(serio->parent);
1611 		psmouse_deactivate(parent);
1612 	}
1613 
1614 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1615 
1616 	if (psmouse->reconnect) {
1617 		if (psmouse->reconnect(psmouse))
1618 			goto out;
1619 	} else {
1620 		psmouse_reset(psmouse);
1621 
1622 		if (psmouse_probe(psmouse) < 0)
1623 			goto out;
1624 
1625 		type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1626 		if (psmouse->type != type)
1627 			goto out;
1628 	}
1629 
1630 	/*
1631 	 * OK, the device type (and capabilities) match the old one,
1632 	 * we can continue using it, complete initialization
1633 	 */
1634 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1635 
1636 	psmouse_initialize(psmouse);
1637 
1638 	if (parent && parent->pt_activate)
1639 		parent->pt_activate(parent);
1640 
1641 	psmouse_activate(psmouse);
1642 	rc = 0;
1643 
1644 out:
1645 	/* If this is a pass-through port the parent waits to be activated */
1646 	if (parent)
1647 		psmouse_activate(parent);
1648 
1649 	mutex_unlock(&psmouse_mutex);
1650 	return rc;
1651 }
1652 
1653 static struct serio_device_id psmouse_serio_ids[] = {
1654 	{
1655 		.type	= SERIO_8042,
1656 		.proto	= SERIO_ANY,
1657 		.id	= SERIO_ANY,
1658 		.extra	= SERIO_ANY,
1659 	},
1660 	{
1661 		.type	= SERIO_PS_PSTHRU,
1662 		.proto	= SERIO_ANY,
1663 		.id	= SERIO_ANY,
1664 		.extra	= SERIO_ANY,
1665 	},
1666 	{ 0 }
1667 };
1668 
1669 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1670 
1671 static struct serio_driver psmouse_drv = {
1672 	.driver		= {
1673 		.name	= "psmouse",
1674 	},
1675 	.description	= DRIVER_DESC,
1676 	.id_table	= psmouse_serio_ids,
1677 	.interrupt	= psmouse_interrupt,
1678 	.connect	= psmouse_connect,
1679 	.reconnect	= psmouse_reconnect,
1680 	.disconnect	= psmouse_disconnect,
1681 	.cleanup	= psmouse_cleanup,
1682 };
1683 
1684 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1685 				 char *buf)
1686 {
1687 	struct serio *serio = to_serio_port(dev);
1688 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1689 	struct psmouse *psmouse;
1690 
1691 	psmouse = serio_get_drvdata(serio);
1692 
1693 	return attr->show(psmouse, attr->data, buf);
1694 }
1695 
1696 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1697 				const char *buf, size_t count)
1698 {
1699 	struct serio *serio = to_serio_port(dev);
1700 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1701 	struct psmouse *psmouse, *parent = NULL;
1702 	int retval;
1703 
1704 	retval = mutex_lock_interruptible(&psmouse_mutex);
1705 	if (retval)
1706 		goto out;
1707 
1708 	psmouse = serio_get_drvdata(serio);
1709 
1710 	if (attr->protect) {
1711 		if (psmouse->state == PSMOUSE_IGNORE) {
1712 			retval = -ENODEV;
1713 			goto out_unlock;
1714 		}
1715 
1716 		if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1717 			parent = serio_get_drvdata(serio->parent);
1718 			psmouse_deactivate(parent);
1719 		}
1720 
1721 		psmouse_deactivate(psmouse);
1722 	}
1723 
1724 	retval = attr->set(psmouse, attr->data, buf, count);
1725 
1726 	if (attr->protect) {
1727 		if (retval != -ENODEV)
1728 			psmouse_activate(psmouse);
1729 
1730 		if (parent)
1731 			psmouse_activate(parent);
1732 	}
1733 
1734  out_unlock:
1735 	mutex_unlock(&psmouse_mutex);
1736  out:
1737 	return retval;
1738 }
1739 
1740 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1741 {
1742 	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1743 
1744 	return sprintf(buf, "%u\n", *field);
1745 }
1746 
1747 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1748 {
1749 	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1750 	unsigned int value;
1751 	int err;
1752 
1753 	err = kstrtouint(buf, 10, &value);
1754 	if (err)
1755 		return err;
1756 
1757 	*field = value;
1758 
1759 	return count;
1760 }
1761 
1762 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1763 {
1764 	return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
1765 }
1766 
1767 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1768 {
1769 	struct serio *serio = psmouse->ps2dev.serio;
1770 	struct psmouse *parent = NULL;
1771 	struct input_dev *old_dev, *new_dev;
1772 	const struct psmouse_protocol *proto, *old_proto;
1773 	int error;
1774 	int retry = 0;
1775 
1776 	proto = psmouse_protocol_by_name(buf, count);
1777 	if (!proto)
1778 		return -EINVAL;
1779 
1780 	if (psmouse->type == proto->type)
1781 		return count;
1782 
1783 	new_dev = input_allocate_device();
1784 	if (!new_dev)
1785 		return -ENOMEM;
1786 
1787 	while (!list_empty(&serio->children)) {
1788 		if (++retry > 3) {
1789 			psmouse_warn(psmouse,
1790 				     "failed to destroy children ports, protocol change aborted.\n");
1791 			input_free_device(new_dev);
1792 			return -EIO;
1793 		}
1794 
1795 		mutex_unlock(&psmouse_mutex);
1796 		serio_unregister_child_port(serio);
1797 		mutex_lock(&psmouse_mutex);
1798 
1799 		if (serio->drv != &psmouse_drv) {
1800 			input_free_device(new_dev);
1801 			return -ENODEV;
1802 		}
1803 
1804 		if (psmouse->type == proto->type) {
1805 			input_free_device(new_dev);
1806 			return count; /* switched by other thread */
1807 		}
1808 	}
1809 
1810 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1811 		parent = serio_get_drvdata(serio->parent);
1812 		if (parent->pt_deactivate)
1813 			parent->pt_deactivate(parent);
1814 	}
1815 
1816 	old_dev = psmouse->dev;
1817 	old_proto = psmouse_protocol_by_type(psmouse->type);
1818 
1819 	if (psmouse->disconnect)
1820 		psmouse->disconnect(psmouse);
1821 
1822 	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1823 
1824 	psmouse->dev = new_dev;
1825 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1826 
1827 	if (psmouse_switch_protocol(psmouse, proto) < 0) {
1828 		psmouse_reset(psmouse);
1829 		/* default to PSMOUSE_PS2 */
1830 		psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1831 	}
1832 
1833 	psmouse_initialize(psmouse);
1834 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1835 
1836 	error = input_register_device(psmouse->dev);
1837 	if (error) {
1838 		if (psmouse->disconnect)
1839 			psmouse->disconnect(psmouse);
1840 
1841 		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1842 		input_free_device(new_dev);
1843 		psmouse->dev = old_dev;
1844 		psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1845 		psmouse_switch_protocol(psmouse, old_proto);
1846 		psmouse_initialize(psmouse);
1847 		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1848 
1849 		return error;
1850 	}
1851 
1852 	input_unregister_device(old_dev);
1853 
1854 	if (parent && parent->pt_activate)
1855 		parent->pt_activate(parent);
1856 
1857 	return count;
1858 }
1859 
1860 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1861 {
1862 	unsigned int value;
1863 	int err;
1864 
1865 	err = kstrtouint(buf, 10, &value);
1866 	if (err)
1867 		return err;
1868 
1869 	psmouse->set_rate(psmouse, value);
1870 	return count;
1871 }
1872 
1873 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1874 {
1875 	unsigned int value;
1876 	int err;
1877 
1878 	err = kstrtouint(buf, 10, &value);
1879 	if (err)
1880 		return err;
1881 
1882 	psmouse->set_resolution(psmouse, value);
1883 	return count;
1884 }
1885 
1886 
1887 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
1888 {
1889 	const struct psmouse_protocol *proto;
1890 
1891 	if (!val)
1892 		return -EINVAL;
1893 
1894 	proto = psmouse_protocol_by_name(val, strlen(val));
1895 
1896 	if (!proto || !proto->maxproto)
1897 		return -EINVAL;
1898 
1899 	*((unsigned int *)kp->arg) = proto->type;
1900 
1901 	return 0;
1902 }
1903 
1904 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
1905 {
1906 	int type = *((unsigned int *)kp->arg);
1907 
1908 	return sprintf(buffer, "%s", psmouse_protocol_by_type(type)->name);
1909 }
1910 
1911 static int __init psmouse_init(void)
1912 {
1913 	int err;
1914 
1915 	lifebook_module_init();
1916 	synaptics_module_init();
1917 	hgpk_module_init();
1918 
1919 	kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
1920 	if (!kpsmoused_wq) {
1921 		pr_err("failed to create kpsmoused workqueue\n");
1922 		return -ENOMEM;
1923 	}
1924 
1925 	err = serio_register_driver(&psmouse_drv);
1926 	if (err)
1927 		destroy_workqueue(kpsmoused_wq);
1928 
1929 	return err;
1930 }
1931 
1932 static void __exit psmouse_exit(void)
1933 {
1934 	serio_unregister_driver(&psmouse_drv);
1935 	destroy_workqueue(kpsmoused_wq);
1936 }
1937 
1938 module_init(psmouse_init);
1939 module_exit(psmouse_exit);
1940