1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * PS/2 mouse driver
   4 *
   5 * Copyright (c) 1999-2002 Vojtech Pavlik
   6 * Copyright (c) 2003-2004 Dmitry Torokhov
   7 */
   8
   9
  10#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
  11#define psmouse_fmt(fmt)	fmt
  12
  13#include <linux/bitops.h>
  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#include <linux/types.h>
  24
  25#include "psmouse.h"
  26#include "synaptics.h"
  27#include "logips2pp.h"
  28#include "alps.h"
  29#include "hgpk.h"
  30#include "lifebook.h"
  31#include "trackpoint.h"
  32#include "touchkit_ps2.h"
  33#include "elantech.h"
  34#include "sentelic.h"
  35#include "cypress_ps2.h"
  36#include "focaltech.h"
  37#include "vmmouse.h"
  38#include "byd.h"
  39
  40#define DRIVER_DESC	"PS/2 mouse driver"
  41
  42MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  43MODULE_DESCRIPTION(DRIVER_DESC);
  44MODULE_LICENSE("GPL");
  45
  46static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
  47static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
  48static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
  49static const struct kernel_param_ops param_ops_proto_abbrev = {
  50	.set = psmouse_set_maxproto,
  51	.get = psmouse_get_maxproto,
  52};
  53#define param_check_proto_abbrev(name, p)	__param_check(name, p, unsigned int)
  54module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
  55MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
  56
  57static unsigned int psmouse_resolution = 200;
  58module_param_named(resolution, psmouse_resolution, uint, 0644);
  59MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
  60
  61static unsigned int psmouse_rate = 100;
  62module_param_named(rate, psmouse_rate, uint, 0644);
  63MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
  64
  65static bool psmouse_smartscroll = true;
  66module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
  67MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
  68
  69static bool psmouse_a4tech_2wheels;
  70module_param_named(a4tech_workaround, psmouse_a4tech_2wheels, bool, 0644);
  71MODULE_PARM_DESC(a4tech_workaround, "A4Tech second scroll wheel workaround, 1 = enabled, 0 = disabled (default).");
  72
  73static unsigned int psmouse_resetafter = 5;
  74module_param_named(resetafter, psmouse_resetafter, uint, 0644);
  75MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
  76
  77static unsigned int psmouse_resync_time;
  78module_param_named(resync_time, psmouse_resync_time, uint, 0644);
  79MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
  80
  81PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
  82			NULL,
  83			psmouse_attr_show_protocol, psmouse_attr_set_protocol);
  84PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
  85			(void *) offsetof(struct psmouse, rate),
  86			psmouse_show_int_attr, psmouse_attr_set_rate);
  87PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
  88			(void *) offsetof(struct psmouse, resolution),
  89			psmouse_show_int_attr, psmouse_attr_set_resolution);
  90PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
  91			(void *) offsetof(struct psmouse, resetafter),
  92			psmouse_show_int_attr, psmouse_set_int_attr);
  93PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
  94			(void *) offsetof(struct psmouse, resync_time),
  95			psmouse_show_int_attr, psmouse_set_int_attr);
  96
  97static struct attribute *psmouse_dev_attrs[] = {
  98	&psmouse_attr_protocol.dattr.attr,
  99	&psmouse_attr_rate.dattr.attr,
 100	&psmouse_attr_resolution.dattr.attr,
 101	&psmouse_attr_resetafter.dattr.attr,
 102	&psmouse_attr_resync_time.dattr.attr,
 103	NULL
 104};
 105
 106ATTRIBUTE_GROUPS(psmouse_dev);
 
 
 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 */
 115static DEFINE_MUTEX(psmouse_mutex);
 116
 117static struct workqueue_struct *kpsmoused_wq;
 118
 119struct psmouse *psmouse_from_serio(struct serio *serio)
 120{
 121	struct ps2dev *ps2dev = serio_get_drvdata(serio);
 122
 123	return container_of(ps2dev, struct psmouse, ps2dev);
 124}
 125
 126void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
 127{
 128	input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
 129	input_report_key(dev, BTN_MIDDLE, buttons & BIT(2));
 130	input_report_key(dev, BTN_RIGHT,  buttons & BIT(1));
 131}
 132
 133void psmouse_report_standard_motion(struct input_dev *dev, u8 *packet)
 134{
 135	int x, y;
 136
 137	x = packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0;
 138	y = packet[2] ? packet[2] - ((packet[0] << 3) & 0x100) : 0;
 139
 140	input_report_rel(dev, REL_X, x);
 141	input_report_rel(dev, REL_Y, -y);
 142}
 143
 144void psmouse_report_standard_packet(struct input_dev *dev, u8 *packet)
 145{
 146	psmouse_report_standard_buttons(dev, packet[0]);
 147	psmouse_report_standard_motion(dev, packet);
 148}
 149
 150/*
 151 * psmouse_process_byte() analyzes the PS/2 data stream and reports
 152 * relevant events to the input module once full packet has arrived.
 153 */
 154psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 155{
 156	struct input_dev *dev = psmouse->dev;
 157	u8 *packet = psmouse->packet;
 158	int wheel;
 159
 160	if (psmouse->pktcnt < psmouse->pktsize)
 161		return PSMOUSE_GOOD_DATA;
 162
 163	/* Full packet accumulated, process it */
 164
 165	switch (psmouse->protocol->type) {
 166	case PSMOUSE_IMPS:
 167		/* IntelliMouse has scroll wheel */
 168		input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
 169		break;
 170
 171	case PSMOUSE_IMEX:
 172		/* Scroll wheel and buttons on IntelliMouse Explorer */
 173		switch (packet[3] & 0xC0) {
 174		case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 175			input_report_rel(dev, REL_WHEEL,
 176					 -sign_extend32(packet[3], 5));
 177			break;
 178		case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 179			input_report_rel(dev, REL_HWHEEL,
 180					 -sign_extend32(packet[3], 5));
 181			break;
 182		case 0x00:
 183		case 0xC0:
 184			wheel = sign_extend32(packet[3], 3);
 185
 186			/*
 187			 * Some A4Tech mice have two scroll wheels, with first
 188			 * one reporting +/-1 in the lower nibble, and second
 189			 * one reporting +/-2.
 190			 */
 191			if (psmouse_a4tech_2wheels && abs(wheel) > 1)
 192				input_report_rel(dev, REL_HWHEEL, wheel / 2);
 193			else
 194				input_report_rel(dev, REL_WHEEL, -wheel);
 195
 196			input_report_key(dev, BTN_SIDE,  packet[3] & BIT(4));
 197			input_report_key(dev, BTN_EXTRA, packet[3] & BIT(5));
 198			break;
 199		}
 200		break;
 201
 202	case PSMOUSE_GENPS:
 203		/* Report scroll buttons on NetMice */
 204		input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
 205
 206		/* Extra buttons on Genius NewNet 3D */
 207		input_report_key(dev, BTN_SIDE,  packet[0] & BIT(6));
 208		input_report_key(dev, BTN_EXTRA, packet[0] & BIT(7));
 209		break;
 210
 211	case PSMOUSE_THINKPS:
 212		/* Extra button on ThinkingMouse */
 213		input_report_key(dev, BTN_EXTRA, packet[0] & BIT(3));
 214
 215		/*
 216		 * Without this bit of weirdness moving up gives wildly
 217		 * high Y changes.
 218		 */
 219		packet[1] |= (packet[0] & 0x40) << 1;
 220		break;
 221
 222	case PSMOUSE_CORTRON:
 223		/*
 224		 * Cortron PS2 Trackball reports SIDE button in the
 225		 * 4th bit of the first byte.
 226		 */
 227		input_report_key(dev, BTN_SIDE, packet[0] & BIT(3));
 228		packet[0] |= BIT(3);
 229		break;
 230
 231	default:
 232		break;
 233	}
 234
 235	/* Generic PS/2 Mouse */
 236	packet[0] |= psmouse->extra_buttons;
 237	psmouse_report_standard_packet(dev, packet);
 238
 239	input_sync(dev);
 240
 241	return PSMOUSE_FULL_PACKET;
 242}
 243
 244void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 245		unsigned long delay)
 246{
 247	queue_delayed_work(kpsmoused_wq, work, delay);
 248}
 249
 250/*
 251 * __psmouse_set_state() sets new psmouse state and resets all flags.
 252 */
 253static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 254{
 255	psmouse->state = new_state;
 256	psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 257	psmouse->ps2dev.flags = 0;
 258	psmouse->last = jiffies;
 259}
 260
 261/*
 262 * psmouse_set_state() sets new psmouse state and resets all flags and
 263 * counters while holding serio lock so fighting with interrupt handler
 264 * is not a concern.
 265 */
 266void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 267{
 268	serio_pause_rx(psmouse->ps2dev.serio);
 269	__psmouse_set_state(psmouse, new_state);
 270	serio_continue_rx(psmouse->ps2dev.serio);
 271}
 272
 273/*
 274 * psmouse_handle_byte() processes one byte of the input data stream
 275 * by calling corresponding protocol handler.
 276 */
 277static int psmouse_handle_byte(struct psmouse *psmouse)
 278{
 279	psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 280
 281	switch (rc) {
 282	case PSMOUSE_BAD_DATA:
 283		if (psmouse->state == PSMOUSE_ACTIVATED) {
 284			psmouse_warn(psmouse,
 285				     "%s at %s lost sync at byte %d\n",
 286				     psmouse->name, psmouse->phys,
 287				     psmouse->pktcnt);
 288			if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 289				__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 290				psmouse_notice(psmouse,
 291						"issuing reconnect request\n");
 292				serio_reconnect(psmouse->ps2dev.serio);
 293				return -EIO;
 294			}
 295		}
 296		psmouse->pktcnt = 0;
 297		break;
 298
 299	case PSMOUSE_FULL_PACKET:
 300		psmouse->pktcnt = 0;
 301		if (psmouse->out_of_sync_cnt) {
 302			psmouse->out_of_sync_cnt = 0;
 303			psmouse_notice(psmouse,
 304					"%s at %s - driver resynced.\n",
 305					psmouse->name, psmouse->phys);
 306		}
 307		break;
 308
 309	case PSMOUSE_GOOD_DATA:
 310		break;
 311	}
 312	return 0;
 313}
 314
 315static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
 316{
 317	switch (psmouse->oob_data_type) {
 318	case PSMOUSE_OOB_NONE:
 319		psmouse->oob_data_type = data;
 320		break;
 321
 322	case PSMOUSE_OOB_EXTRA_BTNS:
 323		psmouse_report_standard_buttons(psmouse->dev, data);
 324		input_sync(psmouse->dev);
 325
 326		psmouse->extra_buttons = data;
 327		psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 328		break;
 329
 330	default:
 331		psmouse_warn(psmouse,
 332			     "unknown OOB_DATA type: 0x%02x\n",
 333			     psmouse->oob_data_type);
 334		psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 335		break;
 336	}
 337}
 338
 339static enum ps2_disposition psmouse_pre_receive_byte(struct ps2dev *ps2dev,
 340						     u8 data,
 341						     unsigned int flags)
 
 
 
 342{
 343	struct psmouse *psmouse = container_of(ps2dev, struct psmouse, ps2dev);
 344
 345	if (psmouse->state == PSMOUSE_IGNORE)
 346		return PS2_IGNORE;
 347
 348	if (unlikely((flags & SERIO_TIMEOUT) ||
 349		     ((flags & SERIO_PARITY) &&
 350		      !psmouse->protocol->ignore_parity))) {
 351
 352		if (psmouse->state == PSMOUSE_ACTIVATED)
 353			psmouse_warn(psmouse,
 354				     "bad data from KBC -%s%s\n",
 355				     flags & SERIO_TIMEOUT ? " timeout" : "",
 356				     flags & SERIO_PARITY ? " bad parity" : "");
 357		return PS2_ERROR;
 
 358	}
 359
 360	if (flags & SERIO_OOB_DATA) {
 361		psmouse_handle_oob_data(psmouse, data);
 362		return PS2_IGNORE;
 363	}
 364
 365	return PS2_PROCESS;
 366}
 
 367
 368static void psmouse_receive_byte(struct ps2dev *ps2dev, u8 data)
 369{
 370	struct psmouse *psmouse = container_of(ps2dev, struct psmouse, ps2dev);
 371
 372	pm_wakeup_event(&ps2dev->serio->dev, 0);
 373
 374	if (psmouse->state <= PSMOUSE_RESYNCING)
 375		return;
 376
 377	if (psmouse->state == PSMOUSE_ACTIVATED &&
 378	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 379		psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 380			     psmouse->name, psmouse->phys, psmouse->pktcnt);
 381		psmouse->badbyte = psmouse->packet[0];
 382		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 383		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 384		return;
 385	}
 386
 387	psmouse->packet[psmouse->pktcnt++] = data;
 388
 389	/* Check if this is a new device announcement (0xAA 0x00) */
 390	if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 391		if (psmouse->pktcnt == 1) {
 392			psmouse->last = jiffies;
 393			return;
 394		}
 395
 396		if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 397		    (psmouse->protocol->type == PSMOUSE_HGPK &&
 398		     psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 399			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 400			serio_reconnect(ps2dev->serio);
 401			return;
 402		}
 403
 404		/* Not a new device, try processing first byte normally */
 405		psmouse->pktcnt = 1;
 406		if (psmouse_handle_byte(psmouse))
 407			return;
 408
 409		psmouse->packet[psmouse->pktcnt++] = data;
 410	}
 411
 412	/*
 413	 * See if we need to force resync because mouse was idle for
 414	 * too long.
 415	 */
 416	if (psmouse->state == PSMOUSE_ACTIVATED &&
 417	    psmouse->pktcnt == 1 && psmouse->resync_time &&
 418	    time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 419		psmouse->badbyte = psmouse->packet[0];
 420		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 421		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 422		return;
 423	}
 424
 425	psmouse->last = jiffies;
 426	psmouse_handle_byte(psmouse);
 
 
 
 427}
 428
 429/*
 430 * psmouse_reset() resets the mouse into power-on state.
 431 */
 432int psmouse_reset(struct psmouse *psmouse)
 433{
 434	u8 param[2];
 435	int error;
 436
 437	error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT);
 438	if (error)
 439		return error;
 440
 441	if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 442		return -EIO;
 443
 444	return 0;
 445}
 446
 447/*
 448 * Here we set the mouse resolution.
 449 */
 450void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 451{
 452	static const u8 params[] = { 0, 1, 2, 2, 3 };
 453	u8 p;
 454
 455	if (resolution == 0 || resolution > 200)
 456		resolution = 200;
 457
 458	p = params[resolution / 50];
 459	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 460	psmouse->resolution = 25 << p;
 461}
 462
 463/*
 464 * Here we set the mouse report rate.
 465 */
 466static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 467{
 468	static const u8 rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 469	u8 r;
 470	int i = 0;
 471
 472	while (rates[i] > rate)
 473		i++;
 474	r = rates[i];
 475	ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 476	psmouse->rate = r;
 477}
 478
 479/*
 480 * Here we set the mouse scaling.
 481 */
 482static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 483{
 484	ps2_command(&psmouse->ps2dev, NULL,
 485		    scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 486					       PSMOUSE_CMD_SETSCALE11);
 487}
 488
 489/*
 490 * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 491 */
 492static int psmouse_poll(struct psmouse *psmouse)
 493{
 494	return ps2_command(&psmouse->ps2dev, psmouse->packet,
 495			   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 496}
 497
 498static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 499{
 500	int i;
 501
 502	for (i = 0; ids[i]; i++)
 503		if (!strcasecmp(id, ids[i]))
 504			return true;
 505
 506	return false;
 507}
 508
 509/*
 510 * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 511 */
 512bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 513{
 514	struct serio *serio = psmouse->ps2dev.serio;
 515	char *p, *fw_id_copy, *save_ptr;
 516	bool found = false;
 517
 518	if (strncmp(serio->firmware_id, "PNP: ", 5))
 519		return false;
 520
 521	fw_id_copy = kstrndup(&serio->firmware_id[5],
 522			      sizeof(serio->firmware_id) - 5,
 523			      GFP_KERNEL);
 524	if (!fw_id_copy)
 525		return false;
 526
 527	save_ptr = fw_id_copy;
 528	while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 529		if (psmouse_check_pnp_id(p, ids)) {
 530			found = true;
 531			break;
 532		}
 533	}
 534
 535	kfree(save_ptr);
 536	return found;
 537}
 538
 539/*
 540 * Genius NetMouse magic init.
 541 */
 542static int genius_detect(struct psmouse *psmouse, bool set_properties)
 543{
 544	struct ps2dev *ps2dev = &psmouse->ps2dev;
 545	u8 param[4];
 546
 547	param[0] = 3;
 548	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 549	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 550	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 551	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 552	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 553
 554	if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 555		return -ENODEV;
 556
 557	if (set_properties) {
 558		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 559		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
 560		__set_bit(BTN_SIDE, psmouse->dev->keybit);
 561		__set_bit(REL_WHEEL, psmouse->dev->relbit);
 562
 563		psmouse->vendor = "Genius";
 564		psmouse->name = "Mouse";
 565		psmouse->pktsize = 4;
 566	}
 567
 568	return 0;
 569}
 570
 571/*
 572 * IntelliMouse magic init.
 573 */
 574static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 575{
 576	struct ps2dev *ps2dev = &psmouse->ps2dev;
 577	u8 param[2];
 578
 579	param[0] = 200;
 580	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 581	param[0] = 100;
 582	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 583	param[0] =  80;
 584	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 585	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 586
 587	if (param[0] != 3)
 588		return -ENODEV;
 589
 590	if (set_properties) {
 591		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 592		__set_bit(REL_WHEEL, psmouse->dev->relbit);
 593
 594		if (!psmouse->vendor)
 595			psmouse->vendor = "Generic";
 596		if (!psmouse->name)
 597			psmouse->name = "Wheel Mouse";
 598		psmouse->pktsize = 4;
 599	}
 600
 601	return 0;
 602}
 603
 604/*
 605 * Try IntelliMouse/Explorer magic init.
 606 */
 607static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 608{
 609	struct ps2dev *ps2dev = &psmouse->ps2dev;
 610	u8 param[2];
 611
 612	intellimouse_detect(psmouse, 0);
 613
 614	param[0] = 200;
 615	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 616	param[0] = 200;
 617	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 618	param[0] =  80;
 619	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 620	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 621
 622	if (param[0] != 4)
 623		return -ENODEV;
 624
 625	/* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 626	param[0] = 200;
 627	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 628	param[0] =  80;
 629	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 630	param[0] =  40;
 631	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 632
 633	if (set_properties) {
 634		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 635		__set_bit(REL_WHEEL, psmouse->dev->relbit);
 636		__set_bit(REL_HWHEEL, psmouse->dev->relbit);
 637		__set_bit(BTN_SIDE, psmouse->dev->keybit);
 638		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
 639
 640		if (!psmouse->vendor)
 641			psmouse->vendor = "Generic";
 642		if (!psmouse->name)
 643			psmouse->name = "Explorer Mouse";
 644		psmouse->pktsize = 4;
 645	}
 646
 647	return 0;
 648}
 649
 650/*
 651 * Kensington ThinkingMouse / ExpertMouse magic init.
 652 */
 653static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 654{
 655	struct ps2dev *ps2dev = &psmouse->ps2dev;
 656	u8 param[2];
 657	static const u8 seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 658	int i;
 659
 660	param[0] = 10;
 661	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 662	param[0] = 0;
 663	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 664	for (i = 0; i < ARRAY_SIZE(seq); i++) {
 665		param[0] = seq[i];
 666		ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 667	}
 668	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 669
 670	if (param[0] != 2)
 671		return -ENODEV;
 672
 673	if (set_properties) {
 674		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 675		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
 676
 677		psmouse->vendor = "Kensington";
 678		psmouse->name = "ThinkingMouse";
 679	}
 680
 681	return 0;
 682}
 683
 684/*
 685 * Bare PS/2 protocol "detection". Always succeeds.
 686 */
 687static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 688{
 689	if (set_properties) {
 690		if (!psmouse->vendor)
 691			psmouse->vendor = "Generic";
 692		if (!psmouse->name)
 693			psmouse->name = "Mouse";
 694
 695		/*
 696		 * We have no way of figuring true number of buttons so let's
 697		 * assume that the device has 3.
 698		 */
 699		input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
 700	}
 701
 702	return 0;
 703}
 704
 705/*
 706 * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 707 * must be forced by sysfs protocol writing.
 708 */
 709static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 710{
 711	if (set_properties) {
 712		psmouse->vendor = "Cortron";
 713		psmouse->name = "PS/2 Trackball";
 714
 715		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 716		__set_bit(BTN_SIDE, psmouse->dev->keybit);
 717	}
 718
 719	return 0;
 720}
 721
 722static const struct psmouse_protocol psmouse_protocols[] = {
 723	{
 724		.type		= PSMOUSE_PS2,
 725		.name		= "PS/2",
 726		.alias		= "bare",
 727		.maxproto	= true,
 728		.ignore_parity	= true,
 729		.detect		= ps2bare_detect,
 730		.try_passthru	= true,
 731	},
 732#ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 733	{
 734		.type		= PSMOUSE_PS2PP,
 735		.name		= "PS2++",
 736		.alias		= "logitech",
 737		.detect		= ps2pp_detect,
 738	},
 739#endif
 740	{
 741		.type		= PSMOUSE_THINKPS,
 742		.name		= "ThinkPS/2",
 743		.alias		= "thinkps",
 744		.detect		= thinking_detect,
 745	},
 746#ifdef CONFIG_MOUSE_PS2_CYPRESS
 747	{
 748		.type		= PSMOUSE_CYPRESS,
 749		.name		= "CyPS/2",
 750		.alias		= "cypress",
 751		.detect		= cypress_detect,
 752		.init		= cypress_init,
 753	},
 754#endif
 755	{
 756		.type		= PSMOUSE_GENPS,
 757		.name		= "GenPS/2",
 758		.alias		= "genius",
 759		.detect		= genius_detect,
 760	},
 761	{
 762		.type		= PSMOUSE_IMPS,
 763		.name		= "ImPS/2",
 764		.alias		= "imps",
 765		.maxproto	= true,
 766		.ignore_parity	= true,
 767		.detect		= intellimouse_detect,
 768		.try_passthru	= true,
 769	},
 770	{
 771		.type		= PSMOUSE_IMEX,
 772		.name		= "ImExPS/2",
 773		.alias		= "exps",
 774		.maxproto	= true,
 775		.ignore_parity	= true,
 776		.detect		= im_explorer_detect,
 777		.try_passthru	= true,
 778	},
 779#ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 780	{
 781		.type		= PSMOUSE_SYNAPTICS,
 782		.name		= "SynPS/2",
 783		.alias		= "synaptics",
 784		.detect		= synaptics_detect,
 785		.init		= synaptics_init_absolute,
 786	},
 787	{
 788		.type		= PSMOUSE_SYNAPTICS_RELATIVE,
 789		.name		= "SynRelPS/2",
 790		.alias		= "synaptics-relative",
 791		.detect		= synaptics_detect,
 792		.init		= synaptics_init_relative,
 793	},
 794#endif
 795#ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
 796	{
 797		.type		= PSMOUSE_SYNAPTICS_SMBUS,
 798		.name		= "SynSMBus",
 799		.alias		= "synaptics-smbus",
 800		.detect		= synaptics_detect,
 801		.init		= synaptics_init_smbus,
 802		.smbus_companion = true,
 803	},
 804#endif
 805#ifdef CONFIG_MOUSE_PS2_ALPS
 806	{
 807		.type		= PSMOUSE_ALPS,
 808		.name		= "AlpsPS/2",
 809		.alias		= "alps",
 810		.detect		= alps_detect,
 811		.init		= alps_init,
 812	},
 813#endif
 814#ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 815	{
 816		.type		= PSMOUSE_LIFEBOOK,
 817		.name		= "LBPS/2",
 818		.alias		= "lifebook",
 819		.detect		= lifebook_detect,
 820		.init		= lifebook_init,
 821	},
 822#endif
 823#ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 824	{
 825		.type		= PSMOUSE_TRACKPOINT,
 826		.name		= "TPPS/2",
 827		.alias		= "trackpoint",
 828		.detect		= trackpoint_detect,
 829		.try_passthru	= true,
 830	},
 831#endif
 832#ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 833	{
 834		.type		= PSMOUSE_TOUCHKIT_PS2,
 835		.name		= "touchkitPS/2",
 836		.alias		= "touchkit",
 837		.detect		= touchkit_ps2_detect,
 838	},
 839#endif
 840#ifdef CONFIG_MOUSE_PS2_OLPC
 841	{
 842		.type		= PSMOUSE_HGPK,
 843		.name		= "OLPC HGPK",
 844		.alias		= "hgpk",
 845		.detect		= hgpk_detect,
 846	},
 847#endif
 848#ifdef CONFIG_MOUSE_PS2_ELANTECH
 849	{
 850		.type		= PSMOUSE_ELANTECH,
 851		.name		= "ETPS/2",
 852		.alias		= "elantech",
 853		.detect		= elantech_detect,
 854		.init		= elantech_init_ps2,
 855	},
 856#endif
 857#ifdef CONFIG_MOUSE_PS2_ELANTECH_SMBUS
 858	{
 859		.type		= PSMOUSE_ELANTECH_SMBUS,
 860		.name		= "ETSMBus",
 861		.alias		= "elantech-smbus",
 862		.detect		= elantech_detect,
 863		.init		= elantech_init_smbus,
 864		.smbus_companion = true,
 865	},
 866#endif
 867#ifdef CONFIG_MOUSE_PS2_SENTELIC
 868	{
 869		.type		= PSMOUSE_FSP,
 870		.name		= "FSPPS/2",
 871		.alias		= "fsp",
 872		.detect		= fsp_detect,
 873		.init		= fsp_init,
 874	},
 875#endif
 876	{
 877		.type		= PSMOUSE_CORTRON,
 878		.name		= "CortronPS/2",
 879		.alias		= "cortps",
 880		.detect		= cortron_detect,
 881	},
 882#ifdef CONFIG_MOUSE_PS2_FOCALTECH
 883	{
 884		.type		= PSMOUSE_FOCALTECH,
 885		.name		= "FocalTechPS/2",
 886		.alias		= "focaltech",
 887		.detect		= focaltech_detect,
 888		.init		= focaltech_init,
 889	},
 890#endif
 891#ifdef CONFIG_MOUSE_PS2_VMMOUSE
 892	{
 893		.type		= PSMOUSE_VMMOUSE,
 894		.name		= VMMOUSE_PSNAME,
 895		.alias		= "vmmouse",
 896		.detect		= vmmouse_detect,
 897		.init		= vmmouse_init,
 898	},
 899#endif
 900#ifdef CONFIG_MOUSE_PS2_BYD
 901	{
 902		.type		= PSMOUSE_BYD,
 903		.name		= "BYDPS/2",
 904		.alias		= "byd",
 905		.detect		= byd_detect,
 906		.init		= byd_init,
 907	},
 908#endif
 909	{
 910		.type		= PSMOUSE_AUTO,
 911		.name		= "auto",
 912		.alias		= "any",
 913		.maxproto	= true,
 914	},
 915};
 916
 917static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 918{
 919	int i;
 920
 921	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 922		if (psmouse_protocols[i].type == type)
 923			return &psmouse_protocols[i];
 924
 925	return NULL;
 926}
 927
 928static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 929{
 930	const struct psmouse_protocol *proto;
 931
 932	proto = __psmouse_protocol_by_type(type);
 933	if (proto)
 934		return proto;
 935
 936	WARN_ON(1);
 937	return &psmouse_protocols[0];
 938}
 939
 940static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 941{
 942	const struct psmouse_protocol *p;
 943	int i;
 944
 945	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 946		p = &psmouse_protocols[i];
 947
 948		if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 949		    (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 950			return &psmouse_protocols[i];
 951	}
 952
 953	return NULL;
 954}
 955
 956/*
 957 * Apply default settings to the psmouse structure. Most of them will
 958 * be overridden by individual protocol initialization routines.
 959 */
 960static void psmouse_apply_defaults(struct psmouse *psmouse)
 961{
 962	struct input_dev *input_dev = psmouse->dev;
 963
 964	bitmap_zero(input_dev->evbit, EV_CNT);
 965	bitmap_zero(input_dev->keybit, KEY_CNT);
 966	bitmap_zero(input_dev->relbit, REL_CNT);
 967	bitmap_zero(input_dev->absbit, ABS_CNT);
 968	bitmap_zero(input_dev->mscbit, MSC_CNT);
 969
 970	input_set_capability(input_dev, EV_KEY, BTN_LEFT);
 971	input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
 972
 973	input_set_capability(input_dev, EV_REL, REL_X);
 974	input_set_capability(input_dev, EV_REL, REL_Y);
 975
 976	__set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 977
 978	psmouse->protocol = &psmouse_protocols[0];
 979
 980	psmouse->set_rate = psmouse_set_rate;
 981	psmouse->set_resolution = psmouse_set_resolution;
 982	psmouse->set_scale = psmouse_set_scale;
 983	psmouse->poll = psmouse_poll;
 984	psmouse->protocol_handler = psmouse_process_byte;
 985	psmouse->pktsize = 3;
 986	psmouse->reconnect = NULL;
 987	psmouse->fast_reconnect = NULL;
 988	psmouse->disconnect = NULL;
 989	psmouse->cleanup = NULL;
 990	psmouse->pt_activate = NULL;
 991	psmouse->pt_deactivate = NULL;
 992}
 993
 994static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
 995			      struct psmouse *psmouse, bool allow_passthrough,
 996			      bool set_properties)
 997{
 998	if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
 999	    !allow_passthrough) {
1000		return false;
1001	}
1002
1003	if (set_properties)
1004		psmouse_apply_defaults(psmouse);
1005
1006	return detect(psmouse, set_properties) == 0;
1007}
1008
1009static bool psmouse_try_protocol(struct psmouse *psmouse,
1010				 enum psmouse_type type,
1011				 unsigned int *max_proto,
1012				 bool set_properties, bool init_allowed)
1013{
1014	const struct psmouse_protocol *proto;
1015
1016	proto = __psmouse_protocol_by_type(type);
1017	if (!proto)
1018		return false;
1019
1020	if (!psmouse_do_detect(proto->detect, psmouse, proto->try_passthru,
1021			       set_properties))
1022		return false;
1023
1024	if (set_properties && proto->init && init_allowed) {
1025		if (proto->init(psmouse) != 0) {
1026			/*
1027			 * We detected device, but init failed. Adjust
1028			 * max_proto so we only try standard protocols.
1029			 */
1030			if (*max_proto > PSMOUSE_IMEX)
1031				*max_proto = PSMOUSE_IMEX;
1032
1033			return false;
1034		}
1035	}
1036
1037	return true;
1038}
1039
1040/*
1041 * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
1042 * the mouse may have.
1043 */
1044static int psmouse_extensions(struct psmouse *psmouse,
1045			      unsigned int max_proto, bool set_properties)
1046{
1047	bool synaptics_hardware = false;
1048	int ret;
1049
1050	/*
1051	 * Always check for focaltech, this is safe as it uses pnp-id
1052	 * matching.
1053	 */
1054	if (psmouse_do_detect(focaltech_detect,
1055			      psmouse, false, set_properties)) {
1056		if (max_proto > PSMOUSE_IMEX &&
1057		    IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
1058		    (!set_properties || focaltech_init(psmouse) == 0)) {
1059			return PSMOUSE_FOCALTECH;
1060		}
1061		/*
1062		 * Restrict psmouse_max_proto so that psmouse_initialize()
1063		 * does not try to reset rate and resolution, because even
1064		 * that upsets the device.
1065		 * This also causes us to basically fall through to basic
1066		 * protocol detection, where we fully reset the mouse,
1067		 * and set it up as bare PS/2 protocol device.
1068		 */
1069		psmouse_max_proto = max_proto = PSMOUSE_PS2;
1070	}
1071
1072	/*
1073	 * We always check for LifeBook because it does not disturb mouse
1074	 * (it only checks DMI information).
1075	 */
1076	if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1077				 set_properties, max_proto > PSMOUSE_IMEX))
1078		return PSMOUSE_LIFEBOOK;
1079
1080	if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1081				 set_properties, max_proto > PSMOUSE_IMEX))
1082		return PSMOUSE_VMMOUSE;
1083
1084	/*
1085	 * Try Kensington ThinkingMouse (we try first, because Synaptics
1086	 * probe upsets the ThinkingMouse).
1087	 */
1088	if (max_proto > PSMOUSE_IMEX &&
1089	    psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1090				 set_properties, true)) {
1091		return PSMOUSE_THINKPS;
1092	}
1093
1094	/*
1095	 * Try Synaptics TouchPad. Note that probing is done even if
1096	 * Synaptics protocol support is disabled in config - we need to
1097	 * know if it is Synaptics so we can reset it properly after
1098	 * probing for IntelliMouse.
1099	 */
1100	if (max_proto > PSMOUSE_PS2 &&
1101	    psmouse_do_detect(synaptics_detect,
1102			      psmouse, false, set_properties)) {
1103		synaptics_hardware = true;
1104
1105		if (max_proto > PSMOUSE_IMEX) {
1106			/*
1107			 * Try activating protocol, but check if support is
1108			 * enabled first, since we try detecting Synaptics
1109			 * even when protocol is disabled.
1110			 */
1111			if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
1112			    IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
1113				if (!set_properties)
1114					return PSMOUSE_SYNAPTICS;
1115
1116				ret = synaptics_init(psmouse);
1117				if (ret >= 0)
1118					return ret;
1119			}
1120
1121			/*
1122			 * Some Synaptics touchpads can emulate extended
1123			 * protocols (like IMPS/2).  Unfortunately
1124			 * Logitech/Genius probes confuse some firmware
1125			 * versions so we'll have to skip them.
1126			 */
1127			max_proto = PSMOUSE_IMEX;
1128		}
1129
1130		/*
1131		 * Make sure that touchpad is in relative mode, gestures
1132		 * (taps) are enabled.
1133		 */
1134		synaptics_reset(psmouse);
1135	}
1136
1137	/*
1138	 * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1139	 * because Finger Sensing Pad probe upsets some modules of Cypress
1140	 * Trackpads.
1141	 */
1142	if (max_proto > PSMOUSE_IMEX &&
1143	    psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1144				 set_properties, true)) {
1145		return PSMOUSE_CYPRESS;
1146	}
1147
1148	/* Try ALPS TouchPad */
1149	if (max_proto > PSMOUSE_IMEX) {
1150		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1151		if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1152					 &max_proto, set_properties, true))
1153			return PSMOUSE_ALPS;
1154	}
1155
1156	/* Try OLPC HGPK touchpad */
1157	if (max_proto > PSMOUSE_IMEX &&
1158	    psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1159				 set_properties, true)) {
1160		return PSMOUSE_HGPK;
1161	}
1162
1163	/* Try Elantech touchpad */
1164	if (max_proto > PSMOUSE_IMEX &&
1165	    psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1166				 &max_proto, set_properties, false)) {
1167		if (!set_properties)
1168			return PSMOUSE_ELANTECH;
1169
1170		ret = elantech_init(psmouse);
1171		if (ret >= 0)
1172			return ret;
1173	}
1174
1175	if (max_proto > PSMOUSE_IMEX) {
1176		if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1177					 &max_proto, set_properties, true))
1178			return PSMOUSE_GENPS;
1179
1180		if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1181					 &max_proto, set_properties, true))
1182			return PSMOUSE_PS2PP;
1183
1184		if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1185					 &max_proto, set_properties, true))
1186			return PSMOUSE_TRACKPOINT;
1187
1188		if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1189					 &max_proto, set_properties, true))
1190			return PSMOUSE_TOUCHKIT_PS2;
1191	}
1192
1193	/*
1194	 * Try Finger Sensing Pad. We do it here because its probe upsets
1195	 * Trackpoint devices (causing TP_READ_ID command to time out).
1196	 */
1197	if (max_proto > PSMOUSE_IMEX &&
1198	    psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1199				 &max_proto, set_properties, true)) {
1200		return PSMOUSE_FSP;
1201	}
1202
1203	/*
1204	 * Reset to defaults in case the device got confused by extended
1205	 * protocol probes. Note that we follow up with full reset because
1206	 * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1207	 */
1208	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1209	psmouse_reset(psmouse);
1210
1211	if (max_proto >= PSMOUSE_IMEX &&
1212	    psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1213				 &max_proto, set_properties, true)) {
1214		return PSMOUSE_IMEX;
1215	}
1216
1217	if (max_proto >= PSMOUSE_IMPS &&
1218	    psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1219				 &max_proto, set_properties, true)) {
1220		return PSMOUSE_IMPS;
1221	}
1222
1223	/*
1224	 * Okay, all failed, we have a standard mouse here. The number of
1225	 * the buttons is still a question, though. We assume 3.
1226	 */
1227	psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1228			     &max_proto, set_properties, true);
1229
1230	if (synaptics_hardware) {
1231		/*
1232		 * We detected Synaptics hardware but it did not respond to
1233		 * IMPS/2 probes.  We need to reset the touchpad because if
1234		 * there is a track point on the pass through port it could
1235		 * get disabled while probing for protocol extensions.
1236		 */
1237		psmouse_reset(psmouse);
1238	}
1239
1240	return PSMOUSE_PS2;
1241}
1242
1243/*
1244 * psmouse_probe() probes for a PS/2 mouse.
1245 */
1246static int psmouse_probe(struct psmouse *psmouse)
1247{
1248	struct ps2dev *ps2dev = &psmouse->ps2dev;
1249	u8 param[2];
1250	int error;
1251
1252	/*
1253	 * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1254	 * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1255	 * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1256	 * subsequent ID queries, probably due to a firmware bug.
1257	 */
1258	param[0] = 0xa5;
1259	error = ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
1260	if (error)
1261		return error;
1262
1263	if (param[0] != 0x00 && param[0] != 0x03 &&
1264	    param[0] != 0x04 && param[0] != 0xff)
1265		return -ENODEV;
1266
1267	/*
1268	 * Then we reset and disable the mouse so that it doesn't generate
1269	 * events.
1270	 */
1271	error = ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1272	if (error)
1273		psmouse_warn(psmouse, "Failed to reset mouse on %s: %d\n",
1274			     ps2dev->serio->phys, error);
1275
1276	return 0;
1277}
1278
1279/*
1280 * psmouse_initialize() initializes the mouse to a sane state.
1281 */
1282static void psmouse_initialize(struct psmouse *psmouse)
1283{
1284	/*
1285	 * We set the mouse report rate, resolution and scaling.
1286	 */
1287	if (psmouse_max_proto != PSMOUSE_PS2) {
1288		psmouse->set_rate(psmouse, psmouse->rate);
1289		psmouse->set_resolution(psmouse, psmouse->resolution);
1290		psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1291	}
1292}
1293
1294/*
1295 * psmouse_activate() enables the mouse so that we get motion reports from it.
1296 */
1297int psmouse_activate(struct psmouse *psmouse)
1298{
1299	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1300		psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1301			     psmouse->ps2dev.serio->phys);
1302		return -1;
1303	}
1304
1305	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1306	return 0;
1307}
1308
1309/*
1310 * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1311 * motion reports from it unless we explicitly request it.
1312 */
1313int psmouse_deactivate(struct psmouse *psmouse)
1314{
1315	int error;
1316
1317	error = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
1318	if (error) {
1319		psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n",
1320			     psmouse->ps2dev.serio->phys, error);
1321		return error;
1322	}
1323
1324	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1325	return 0;
1326}
1327
1328/*
1329 * psmouse_resync() attempts to re-validate current protocol.
1330 */
1331static void psmouse_resync(struct work_struct *work)
1332{
1333	struct psmouse *parent = NULL, *psmouse =
1334		container_of(work, struct psmouse, resync_work.work);
1335	struct serio *serio = psmouse->ps2dev.serio;
1336	psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1337	bool failed = false, enabled = false;
1338	int i;
1339
1340	mutex_lock(&psmouse_mutex);
1341
1342	if (psmouse->state != PSMOUSE_RESYNCING)
1343		goto out;
1344
1345	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1346		parent = psmouse_from_serio(serio->parent);
1347		psmouse_deactivate(parent);
1348	}
1349
1350	/*
1351	 * Some mice don't ACK commands sent while they are in the middle of
1352	 * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1353	 * instead of ps2_command() which would wait for 200ms for an ACK
1354	 * that may never come.
1355	 * As an additional quirk ALPS touchpads may not only forget to ACK
1356	 * disable command but will stop reporting taps, so if we see that
1357	 * mouse at least once ACKs disable we will do full reconnect if ACK
1358	 * is missing.
1359	 */
1360	psmouse->num_resyncs++;
1361
1362	if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1363		if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1364			failed = true;
1365	} else
1366		psmouse->acks_disable_command = true;
1367
1368	/*
1369	 * Poll the mouse. If it was reset the packet will be shorter than
1370	 * psmouse->pktsize and ps2_command will fail. We do not expect and
1371	 * do not handle scenario when mouse "upgrades" its protocol while
1372	 * disconnected since it would require additional delay. If we ever
1373	 * see a mouse that does it we'll adjust the code.
1374	 */
1375	if (!failed) {
1376		if (psmouse->poll(psmouse))
1377			failed = true;
1378		else {
1379			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1380			for (i = 0; i < psmouse->pktsize; i++) {
1381				psmouse->pktcnt++;
1382				rc = psmouse->protocol_handler(psmouse);
1383				if (rc != PSMOUSE_GOOD_DATA)
1384					break;
1385			}
1386			if (rc != PSMOUSE_FULL_PACKET)
1387				failed = true;
1388			psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1389		}
1390	}
1391
1392	/*
1393	 * Now try to enable mouse. We try to do that even if poll failed
1394	 * and also repeat our attempts 5 times, otherwise we may be left
1395	 * out with disabled mouse.
1396	 */
1397	for (i = 0; i < 5; i++) {
1398		if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1399			enabled = true;
1400			break;
1401		}
1402		msleep(200);
1403	}
1404
1405	if (!enabled) {
1406		psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1407			     psmouse->ps2dev.serio->phys);
1408		failed = true;
1409	}
1410
1411	if (failed) {
1412		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1413		psmouse_info(psmouse,
1414			     "resync failed, issuing reconnect request\n");
1415		serio_reconnect(serio);
1416	} else
1417		psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1418
1419	if (parent)
1420		psmouse_activate(parent);
1421 out:
1422	mutex_unlock(&psmouse_mutex);
1423}
1424
1425/*
1426 * psmouse_cleanup() resets the mouse into power-on state.
1427 */
1428static void psmouse_cleanup(struct serio *serio)
1429{
1430	struct psmouse *psmouse = psmouse_from_serio(serio);
1431	struct psmouse *parent = NULL;
1432
1433	mutex_lock(&psmouse_mutex);
1434
1435	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1436		parent = psmouse_from_serio(serio->parent);
1437		psmouse_deactivate(parent);
1438	}
1439
1440	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1441
1442	/*
1443	 * Disable stream mode so cleanup routine can proceed undisturbed.
1444	 */
1445	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1446		psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1447			     psmouse->ps2dev.serio->phys);
1448
1449	if (psmouse->cleanup)
1450		psmouse->cleanup(psmouse);
1451
1452	/*
1453	 * Reset the mouse to defaults (bare PS/2 protocol).
1454	 */
1455	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1456
1457	/*
1458	 * Some boxes, such as HP nx7400, get terribly confused if mouse
1459	 * is not fully enabled before suspending/shutting down.
1460	 */
1461	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1462
1463	if (parent) {
1464		if (parent->pt_deactivate)
1465			parent->pt_deactivate(parent);
1466
1467		psmouse_activate(parent);
1468	}
1469
1470	mutex_unlock(&psmouse_mutex);
1471}
1472
1473/*
1474 * psmouse_disconnect() closes and frees.
1475 */
1476static void psmouse_disconnect(struct serio *serio)
1477{
1478	struct psmouse *psmouse = psmouse_from_serio(serio);
1479	struct psmouse *parent = NULL;
1480
 
 
1481	mutex_lock(&psmouse_mutex);
1482
1483	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1484
1485	/* make sure we don't have a resync in progress */
1486	mutex_unlock(&psmouse_mutex);
1487	flush_workqueue(kpsmoused_wq);
1488	mutex_lock(&psmouse_mutex);
1489
1490	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1491		parent = psmouse_from_serio(serio->parent);
1492		psmouse_deactivate(parent);
1493	}
1494
1495	if (psmouse->disconnect)
1496		psmouse->disconnect(psmouse);
1497
1498	if (parent && parent->pt_deactivate)
1499		parent->pt_deactivate(parent);
1500
1501	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1502
1503	serio_close(serio);
1504	serio_set_drvdata(serio, NULL);
1505
1506	if (psmouse->dev)
1507		input_unregister_device(psmouse->dev);
1508
1509	kfree(psmouse);
1510
1511	if (parent)
1512		psmouse_activate(parent);
1513
1514	mutex_unlock(&psmouse_mutex);
1515}
1516
1517static int psmouse_switch_protocol(struct psmouse *psmouse,
1518				   const struct psmouse_protocol *proto)
1519{
1520	const struct psmouse_protocol *selected_proto;
1521	struct input_dev *input_dev = psmouse->dev;
1522	enum psmouse_type type;
1523
1524	input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1525
1526	if (proto && (proto->detect || proto->init)) {
1527		psmouse_apply_defaults(psmouse);
1528
1529		if (proto->detect && proto->detect(psmouse, true) < 0)
1530			return -1;
1531
1532		if (proto->init && proto->init(psmouse) < 0)
1533			return -1;
1534
1535		selected_proto = proto;
1536	} else {
1537		type = psmouse_extensions(psmouse, psmouse_max_proto, true);
1538		selected_proto = psmouse_protocol_by_type(type);
1539	}
1540
1541	psmouse->protocol = selected_proto;
1542
1543	/*
1544	 * If mouse's packet size is 3 there is no point in polling the
1545	 * device in hopes to detect protocol reset - we won't get less
1546	 * than 3 bytes response anyhow.
1547	 */
1548	if (psmouse->pktsize == 3)
1549		psmouse->resync_time = 0;
1550
1551	/*
1552	 * Some smart KVMs fake response to POLL command returning just
1553	 * 3 bytes and messing up our resync logic, so if initial poll
1554	 * fails we won't try polling the device anymore. Hopefully
1555	 * such KVM will maintain initially selected protocol.
1556	 */
1557	if (psmouse->resync_time && psmouse->poll(psmouse))
1558		psmouse->resync_time = 0;
1559
1560	snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1561		 selected_proto->name, psmouse->vendor, psmouse->name);
1562
1563	input_dev->name = psmouse->devname;
1564	input_dev->phys = psmouse->phys;
1565	input_dev->id.bustype = BUS_I8042;
1566	input_dev->id.vendor = 0x0002;
1567	input_dev->id.product = psmouse->protocol->type;
1568	input_dev->id.version = psmouse->model;
1569
1570	return 0;
1571}
1572
1573/*
1574 * psmouse_connect() is a callback from the serio module when
1575 * an unhandled serio port is found.
1576 */
1577static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1578{
1579	struct psmouse *psmouse, *parent = NULL;
1580	struct input_dev *input_dev;
1581	int retval = 0, error = -ENOMEM;
1582
1583	mutex_lock(&psmouse_mutex);
1584
1585	/*
1586	 * If this is a pass-through port deactivate parent so the device
1587	 * connected to this port can be successfully identified
1588	 */
1589	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1590		parent = psmouse_from_serio(serio->parent);
1591		psmouse_deactivate(parent);
1592	}
1593
1594	psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1595	input_dev = input_allocate_device();
1596	if (!psmouse || !input_dev)
1597		goto err_free;
1598
1599	ps2_init(&psmouse->ps2dev, serio,
1600		 psmouse_pre_receive_byte, psmouse_receive_byte);
1601	INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1602	psmouse->dev = input_dev;
1603	snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1604
1605	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1606
 
 
1607	error = serio_open(serio, drv);
1608	if (error)
1609		goto err_clear_drvdata;
1610
1611	/* give PT device some time to settle down before probing */
1612	if (serio->id.type == SERIO_PS_PSTHRU)
1613		usleep_range(10000, 15000);
1614
1615	if (psmouse_probe(psmouse) < 0) {
1616		error = -ENODEV;
1617		goto err_close_serio;
1618	}
1619
1620	psmouse->rate = psmouse_rate;
1621	psmouse->resolution = psmouse_resolution;
1622	psmouse->resetafter = psmouse_resetafter;
1623	psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1624	psmouse->smartscroll = psmouse_smartscroll;
1625
1626	psmouse_switch_protocol(psmouse, NULL);
1627
1628	if (!psmouse->protocol->smbus_companion) {
1629		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1630		psmouse_initialize(psmouse);
1631
1632		error = input_register_device(input_dev);
1633		if (error)
1634			goto err_protocol_disconnect;
1635	} else {
1636		/* Smbus companion will be reporting events, not us. */
1637		input_free_device(input_dev);
1638		psmouse->dev = input_dev = NULL;
1639	}
1640
1641	if (parent && parent->pt_activate)
1642		parent->pt_activate(parent);
1643
 
 
 
 
1644	/*
1645	 * PS/2 devices having SMBus companions should stay disabled
1646	 * on PS/2 side, in order to have SMBus part operable.
1647	 */
1648	if (!psmouse->protocol->smbus_companion)
1649		psmouse_activate(psmouse);
1650
1651 out:
1652	/* If this is a pass-through port the parent needs to be re-activated */
1653	if (parent)
1654		psmouse_activate(parent);
1655
1656	mutex_unlock(&psmouse_mutex);
1657	return retval;
1658
 
 
 
 
 
 
 
1659 err_protocol_disconnect:
1660	if (psmouse->disconnect)
1661		psmouse->disconnect(psmouse);
1662	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1663 err_close_serio:
1664	serio_close(serio);
1665 err_clear_drvdata:
1666	serio_set_drvdata(serio, NULL);
1667 err_free:
1668	input_free_device(input_dev);
1669	kfree(psmouse);
1670
1671	retval = error;
1672	goto out;
1673}
1674
1675static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
1676{
1677	struct psmouse *psmouse = psmouse_from_serio(serio);
1678	struct psmouse *parent = NULL;
1679	int (*reconnect_handler)(struct psmouse *);
1680	enum psmouse_type type;
1681	int rc = -1;
1682
1683	mutex_lock(&psmouse_mutex);
1684
1685	if (fast_reconnect) {
1686		reconnect_handler = psmouse->fast_reconnect;
1687		if (!reconnect_handler) {
1688			rc = -ENOENT;
1689			goto out_unlock;
1690		}
1691	} else {
1692		reconnect_handler = psmouse->reconnect;
1693	}
1694
1695	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1696		parent = psmouse_from_serio(serio->parent);
1697		psmouse_deactivate(parent);
1698	}
1699
1700	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1701
1702	if (reconnect_handler) {
1703		if (reconnect_handler(psmouse))
1704			goto out;
1705	} else {
1706		psmouse_reset(psmouse);
1707
1708		if (psmouse_probe(psmouse) < 0)
1709			goto out;
1710
1711		type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1712		if (psmouse->protocol->type != type)
1713			goto out;
1714	}
1715
1716	/*
1717	 * OK, the device type (and capabilities) match the old one,
1718	 * we can continue using it, complete initialization
1719	 */
1720	if (!psmouse->protocol->smbus_companion) {
1721		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1722		psmouse_initialize(psmouse);
1723	}
1724
1725	if (parent && parent->pt_activate)
1726		parent->pt_activate(parent);
1727
1728	/*
1729	 * PS/2 devices having SMBus companions should stay disabled
1730	 * on PS/2 side, in order to have SMBus part operable.
1731	 */
1732	if (!psmouse->protocol->smbus_companion)
1733		psmouse_activate(psmouse);
1734
1735	rc = 0;
1736
1737out:
1738	/* If this is a pass-through port the parent waits to be activated */
1739	if (parent)
1740		psmouse_activate(parent);
1741
1742out_unlock:
1743	mutex_unlock(&psmouse_mutex);
1744	return rc;
1745}
1746
1747static int psmouse_reconnect(struct serio *serio)
1748{
1749	return __psmouse_reconnect(serio, false);
1750}
1751
1752static int psmouse_fast_reconnect(struct serio *serio)
1753{
1754	return __psmouse_reconnect(serio, true);
1755}
1756
1757static struct serio_device_id psmouse_serio_ids[] = {
1758	{
1759		.type	= SERIO_8042,
1760		.proto	= SERIO_ANY,
1761		.id	= SERIO_ANY,
1762		.extra	= SERIO_ANY,
1763	},
1764	{
1765		.type	= SERIO_PS_PSTHRU,
1766		.proto	= SERIO_ANY,
1767		.id	= SERIO_ANY,
1768		.extra	= SERIO_ANY,
1769	},
1770	{ 0 }
1771};
1772
1773MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1774
1775static struct serio_driver psmouse_drv = {
1776	.driver		= {
1777		.name		= "psmouse",
1778		.dev_groups	= psmouse_dev_groups,
1779	},
1780	.description	= DRIVER_DESC,
1781	.id_table	= psmouse_serio_ids,
1782	.interrupt	= ps2_interrupt,
1783	.connect	= psmouse_connect,
1784	.reconnect	= psmouse_reconnect,
1785	.fast_reconnect	= psmouse_fast_reconnect,
1786	.disconnect	= psmouse_disconnect,
1787	.cleanup	= psmouse_cleanup,
1788};
1789
1790ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1791				 char *buf)
1792{
1793	struct serio *serio = to_serio_port(dev);
1794	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1795	struct psmouse *psmouse = psmouse_from_serio(serio);
1796
1797	if (psmouse->protocol->smbus_companion &&
1798			devattr != &psmouse_attr_protocol.dattr)
1799		return -ENOENT;
1800
1801	return attr->show(psmouse, attr->data, buf);
1802}
1803
1804ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1805				const char *buf, size_t count)
1806{
1807	struct serio *serio = to_serio_port(dev);
1808	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1809	struct psmouse *psmouse, *parent = NULL;
1810	int retval;
1811
1812	retval = mutex_lock_interruptible(&psmouse_mutex);
1813	if (retval)
1814		goto out;
1815
1816	psmouse = psmouse_from_serio(serio);
1817
1818	if (psmouse->protocol->smbus_companion &&
1819			devattr != &psmouse_attr_protocol.dattr) {
1820		retval = -ENOENT;
1821		goto out_unlock;
1822	}
1823
1824	if (attr->protect) {
1825		if (psmouse->state == PSMOUSE_IGNORE) {
1826			retval = -ENODEV;
1827			goto out_unlock;
1828		}
1829
1830		if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1831			parent = psmouse_from_serio(serio->parent);
1832			psmouse_deactivate(parent);
1833		}
1834
1835		if (!psmouse->protocol->smbus_companion)
1836			psmouse_deactivate(psmouse);
1837	}
1838
1839	retval = attr->set(psmouse, attr->data, buf, count);
1840
1841	if (attr->protect) {
1842		if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
1843			psmouse_activate(psmouse);
1844
1845		if (parent)
1846			psmouse_activate(parent);
1847	}
1848
1849 out_unlock:
1850	mutex_unlock(&psmouse_mutex);
1851 out:
1852	return retval;
1853}
1854
1855static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1856{
1857	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1858
1859	return sprintf(buf, "%u\n", *field);
1860}
1861
1862static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1863{
1864	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1865	unsigned int value;
1866	int err;
1867
1868	err = kstrtouint(buf, 10, &value);
1869	if (err)
1870		return err;
1871
1872	*field = value;
1873
1874	return count;
1875}
1876
1877static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1878{
1879	return sprintf(buf, "%s\n", psmouse->protocol->name);
1880}
1881
1882static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1883{
1884	struct serio *serio = psmouse->ps2dev.serio;
1885	struct psmouse *parent = NULL;
1886	struct input_dev *old_dev, *new_dev;
1887	const struct psmouse_protocol *proto, *old_proto;
1888	int error;
1889	int retry = 0;
1890
1891	proto = psmouse_protocol_by_name(buf, count);
1892	if (!proto)
1893		return -EINVAL;
1894
1895	if (psmouse->protocol == proto)
1896		return count;
1897
1898	new_dev = input_allocate_device();
1899	if (!new_dev)
1900		return -ENOMEM;
1901
1902	while (!list_empty(&serio->children)) {
1903		if (++retry > 3) {
1904			psmouse_warn(psmouse,
1905				     "failed to destroy children ports, protocol change aborted.\n");
1906			input_free_device(new_dev);
1907			return -EIO;
1908		}
1909
1910		mutex_unlock(&psmouse_mutex);
1911		serio_unregister_child_port(serio);
1912		mutex_lock(&psmouse_mutex);
1913
1914		if (serio->drv != &psmouse_drv) {
1915			input_free_device(new_dev);
1916			return -ENODEV;
1917		}
1918
1919		if (psmouse->protocol == proto) {
1920			input_free_device(new_dev);
1921			return count; /* switched by other thread */
1922		}
1923	}
1924
1925	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1926		parent = psmouse_from_serio(serio->parent);
1927		if (parent->pt_deactivate)
1928			parent->pt_deactivate(parent);
1929	}
1930
1931	old_dev = psmouse->dev;
1932	old_proto = psmouse->protocol;
1933
1934	if (psmouse->disconnect)
1935		psmouse->disconnect(psmouse);
1936
1937	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1938
1939	psmouse->dev = new_dev;
1940	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1941
1942	if (psmouse_switch_protocol(psmouse, proto) < 0) {
1943		psmouse_reset(psmouse);
1944		/* default to PSMOUSE_PS2 */
1945		psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1946	}
1947
1948	psmouse_initialize(psmouse);
1949	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1950
1951	if (psmouse->protocol->smbus_companion) {
1952		input_free_device(psmouse->dev);
1953		psmouse->dev = NULL;
1954	} else {
1955		error = input_register_device(psmouse->dev);
1956		if (error) {
1957			if (psmouse->disconnect)
1958				psmouse->disconnect(psmouse);
1959
1960			psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1961			input_free_device(new_dev);
1962			psmouse->dev = old_dev;
1963			psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1964			psmouse_switch_protocol(psmouse, old_proto);
1965			psmouse_initialize(psmouse);
1966			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1967
1968			return error;
1969		}
1970	}
1971
1972	if (old_dev)
1973		input_unregister_device(old_dev);
1974
1975	if (parent && parent->pt_activate)
1976		parent->pt_activate(parent);
1977
1978	return count;
1979}
1980
1981static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1982{
1983	unsigned int value;
1984	int err;
1985
1986	err = kstrtouint(buf, 10, &value);
1987	if (err)
1988		return err;
1989
1990	psmouse->set_rate(psmouse, value);
1991	return count;
1992}
1993
1994static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1995{
1996	unsigned int value;
1997	int err;
1998
1999	err = kstrtouint(buf, 10, &value);
2000	if (err)
2001		return err;
2002
2003	psmouse->set_resolution(psmouse, value);
2004	return count;
2005}
2006
2007
2008static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
2009{
2010	const struct psmouse_protocol *proto;
2011
2012	if (!val)
2013		return -EINVAL;
2014
2015	proto = psmouse_protocol_by_name(val, strlen(val));
2016
2017	if (!proto || !proto->maxproto)
2018		return -EINVAL;
2019
2020	*((unsigned int *)kp->arg) = proto->type;
2021
2022	return 0;
2023}
2024
2025static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
2026{
2027	int type = *((unsigned int *)kp->arg);
2028
2029	return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
2030}
2031
2032static int __init psmouse_init(void)
2033{
2034	int err;
2035
2036	lifebook_module_init();
2037	synaptics_module_init();
2038	hgpk_module_init();
2039
2040	err = psmouse_smbus_module_init();
2041	if (err)
2042		return err;
2043
2044	kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
2045	if (!kpsmoused_wq) {
2046		pr_err("failed to create kpsmoused workqueue\n");
2047		err = -ENOMEM;
2048		goto err_smbus_exit;
2049	}
2050
2051	err = serio_register_driver(&psmouse_drv);
2052	if (err)
2053		goto err_destroy_wq;
2054
2055	return 0;
2056
2057err_destroy_wq:
2058	destroy_workqueue(kpsmoused_wq);
2059err_smbus_exit:
2060	psmouse_smbus_module_exit();
2061	return err;
2062}
2063
2064static void __exit psmouse_exit(void)
2065{
2066	serio_unregister_driver(&psmouse_drv);
2067	destroy_workqueue(kpsmoused_wq);
2068	psmouse_smbus_module_exit();
2069}
2070
2071module_init(psmouse_init);
2072module_exit(psmouse_exit);