drivers/input/mouse/psmouse-base.c

   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
  42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  43 MODULE_DESCRIPTION(DRIVER_DESC);
  44 MODULE_LICENSE("GPL");
  45
  46 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
  47 static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
  48 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
  49 static 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)
  54 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
  55 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
  56
  57 static unsigned int psmouse_resolution = 200;
  58 module_param_named(resolution, psmouse_resolution, uint, 0644);
  59 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
  60
  61 static unsigned int psmouse_rate = 100;
  62 module_param_named(rate, psmouse_rate, uint, 0644);
  63 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
  64
  65 static bool psmouse_smartscroll = true;
  66 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
  67 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
  68
  69 static bool psmouse_a4tech_2wheels;
  70 module_param_named(a4tech_workaround, psmouse_a4tech_2wheels, bool, 0644);
  71 MODULE_PARM_DESC(a4tech_workaround, "A4Tech second scroll wheel workaround, 1 = enabled, 0 = disabled (default).");
  72
  73 static unsigned int psmouse_resetafter = 5;
  74 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
  75 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
  76
  77 static unsigned int psmouse_resync_time;
  78 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
  79 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
  80
  81 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
  82                         NULL,
  83                         psmouse_attr_show_protocol, psmouse_attr_set_protocol);
  84 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
  85                         (void *) offsetof(struct psmouse, rate),
  86                         psmouse_show_int_attr, psmouse_attr_set_rate);
  87 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
  88                         (void *) offsetof(struct psmouse, resolution),
  89                         psmouse_show_int_attr, psmouse_attr_set_resolution);
  90 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
  91                         (void *) offsetof(struct psmouse, resetafter),
  92                         psmouse_show_int_attr, psmouse_set_int_attr);
  93 PSMOUSE_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
  97 static 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
 106 ATTRIBUTE_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  */
 115 static DEFINE_MUTEX(psmouse_mutex);
 116
 117 static struct workqueue_struct *kpsmoused_wq;
 118
 119 void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
 120 {
 121         input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
 122         input_report_key(dev, BTN_MIDDLE, buttons & BIT(2));
 123         input_report_key(dev, BTN_RIGHT,  buttons & BIT(1));
 124 }
 125
 126 void psmouse_report_standard_motion(struct input_dev *dev, u8 *packet)
 127 {
 128         int x, y;
 129
 130         x = packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0;
 131         y = packet[2] ? packet[2] - ((packet[0] << 3) & 0x100) : 0;
 132
 133         input_report_rel(dev, REL_X, x);
 134         input_report_rel(dev, REL_Y, -y);
 135 }
 136
 137 void psmouse_report_standard_packet(struct input_dev *dev, u8 *packet)
 138 {
 139         psmouse_report_standard_buttons(dev, packet[0]);
 140         psmouse_report_standard_motion(dev, packet);
 141 }
 142
 143 /*
 144  * psmouse_process_byte() analyzes the PS/2 data stream and reports
 145  * relevant events to the input module once full packet has arrived.
 146  */
 147 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 148 {
 149         struct input_dev *dev = psmouse->dev;
 150         u8 *packet = psmouse->packet;
 151         int wheel;
 152
 153         if (psmouse->pktcnt < psmouse->pktsize)
 154                 return PSMOUSE_GOOD_DATA;
 155
 156         /* Full packet accumulated, process it */
 157
 158         switch (psmouse->protocol->type) {
 159         case PSMOUSE_IMPS:
 160                 /* IntelliMouse has scroll wheel */
 161                 input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
 162                 break;
 163
 164         case PSMOUSE_IMEX:
 165                 /* Scroll wheel and buttons on IntelliMouse Explorer */
 166                 switch (packet[3] & 0xC0) {
 167                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 168                         input_report_rel(dev, REL_WHEEL,
 169                                          -sign_extend32(packet[3], 5));
 170                         break;
 171                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 172                         input_report_rel(dev, REL_HWHEEL,
 173                                          -sign_extend32(packet[3], 5));
 174                         break;
 175                 case 0x00:
 176                 case 0xC0:
 177                         wheel = sign_extend32(packet[3], 3);
 178
 179                         /*
 180                          * Some A4Tech mice have two scroll wheels, with first
 181                          * one reporting +/-1 in the lower nibble, and second
 182                          * one reporting +/-2.
 183                          */
 184                         if (psmouse_a4tech_2wheels && abs(wheel) > 1)
 185                                 input_report_rel(dev, REL_HWHEEL, wheel / 2);
 186                         else
 187                                 input_report_rel(dev, REL_WHEEL, -wheel);
 188
 189                         input_report_key(dev, BTN_SIDE,  packet[3] & BIT(4));
 190                         input_report_key(dev, BTN_EXTRA, packet[3] & BIT(5));
 191                         break;
 192                 }
 193                 break;
 194
 195         case PSMOUSE_GENPS:
 196                 /* Report scroll buttons on NetMice */
 197                 input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
 198
 199                 /* Extra buttons on Genius NewNet 3D */
 200                 input_report_key(dev, BTN_SIDE,  packet[0] & BIT(6));
 201                 input_report_key(dev, BTN_EXTRA, packet[0] & BIT(7));
 202                 break;
 203
 204         case PSMOUSE_THINKPS:
 205                 /* Extra button on ThinkingMouse */
 206                 input_report_key(dev, BTN_EXTRA, packet[0] & BIT(3));
 207
 208                 /*
 209                  * Without this bit of weirdness moving up gives wildly
 210                  * high Y changes.
 211                  */
 212                 packet[1] |= (packet[0] & 0x40) << 1;
 213                 break;
 214
 215         case PSMOUSE_CORTRON:
 216                 /*
 217                  * Cortron PS2 Trackball reports SIDE button in the
 218                  * 4th bit of the first byte.
 219                  */
 220                 input_report_key(dev, BTN_SIDE, packet[0] & BIT(3));
 221                 packet[0] |= BIT(3);
 222                 break;
 223
 224         default:
 225                 break;
 226         }
 227
 228         /* Generic PS/2 Mouse */
 229         packet[0] |= psmouse->extra_buttons;
 230         psmouse_report_standard_packet(dev, packet);
 231
 232         input_sync(dev);
 233
 234         return PSMOUSE_FULL_PACKET;
 235 }
 236
 237 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 238                 unsigned long delay)
 239 {
 240         queue_delayed_work(kpsmoused_wq, work, delay);
 241 }
 242
 243 /*
 244  * __psmouse_set_state() sets new psmouse state and resets all flags.
 245  */
 246 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 247 {
 248         psmouse->state = new_state;
 249         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 250         psmouse->ps2dev.flags = 0;
 251         psmouse->last = jiffies;
 252 }
 253
 254 /*
 255  * psmouse_set_state() sets new psmouse state and resets all flags and
 256  * counters while holding serio lock so fighting with interrupt handler
 257  * is not a concern.
 258  */
 259 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 260 {
 261         serio_pause_rx(psmouse->ps2dev.serio);
 262         __psmouse_set_state(psmouse, new_state);
 263         serio_continue_rx(psmouse->ps2dev.serio);
 264 }
 265
 266 /*
 267  * psmouse_handle_byte() processes one byte of the input data stream
 268  * by calling corresponding protocol handler.
 269  */
 270 static int psmouse_handle_byte(struct psmouse *psmouse)
 271 {
 272         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 273
 274         switch (rc) {
 275         case PSMOUSE_BAD_DATA:
 276                 if (psmouse->state == PSMOUSE_ACTIVATED) {
 277                         psmouse_warn(psmouse,
 278                                      "%s at %s lost sync at byte %d\n",
 279                                      psmouse->name, psmouse->phys,
 280                                      psmouse->pktcnt);
 281                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 282                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 283                                 psmouse_notice(psmouse,
 284                                                 "issuing reconnect request\n");
 285                                 serio_reconnect(psmouse->ps2dev.serio);
 286                                 return -EIO;
 287                         }
 288                 }
 289                 psmouse->pktcnt = 0;
 290                 break;
 291
 292         case PSMOUSE_FULL_PACKET:
 293                 psmouse->pktcnt = 0;
 294                 if (psmouse->out_of_sync_cnt) {
 295                         psmouse->out_of_sync_cnt = 0;
 296                         psmouse_notice(psmouse,
 297                                         "%s at %s - driver resynced.\n",
 298                                         psmouse->name, psmouse->phys);
 299                 }
 300                 break;
 301
 302         case PSMOUSE_GOOD_DATA:
 303                 break;
 304         }
 305         return 0;
 306 }
 307
 308 static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
 309 {
 310         switch (psmouse->oob_data_type) {
 311         case PSMOUSE_OOB_NONE:
 312                 psmouse->oob_data_type = data;
 313                 break;
 314
 315         case PSMOUSE_OOB_EXTRA_BTNS:
 316                 psmouse_report_standard_buttons(psmouse->dev, data);
 317                 input_sync(psmouse->dev);
 318
 319                 psmouse->extra_buttons = data;
 320                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 321                 break;
 322
 323         default:
 324                 psmouse_warn(psmouse,
 325                              "unknown OOB_DATA type: 0x%02x\n",
 326                              psmouse->oob_data_type);
 327                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 328                 break;
 329         }
 330 }
 331
 332 /*
 333  * psmouse_interrupt() handles incoming characters, either passing them
 334  * for normal processing or gathering them as command response.
 335  */
 336 static irqreturn_t psmouse_interrupt(struct serio *serio,
 337                                      u8 data, unsigned int flags)
 338 {
 339         struct psmouse *psmouse = serio_get_drvdata(serio);
 340
 341         if (psmouse->state == PSMOUSE_IGNORE)
 342                 goto out;
 343
 344         if (unlikely((flags & SERIO_TIMEOUT) ||
 345                      ((flags & SERIO_PARITY) &&
 346                       !psmouse->protocol->ignore_parity))) {
 347
 348                 if (psmouse->state == PSMOUSE_ACTIVATED)
 349                         psmouse_warn(psmouse,
 350                                      "bad data from KBC -%s%s\n",
 351                                      flags & SERIO_TIMEOUT ? " timeout" : "",
 352                                      flags & SERIO_PARITY ? " bad parity" : "");
 353                 ps2_cmd_aborted(&psmouse->ps2dev);
 354                 goto out;
 355         }
 356
 357         if (flags & SERIO_OOB_DATA) {
 358                 psmouse_handle_oob_data(psmouse, data);
 359                 goto out;
 360         }
 361
 362         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
 363                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
 364                         goto out;
 365
 366         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
 367                 if  (ps2_handle_response(&psmouse->ps2dev, data))
 368                         goto out;
 369
 370         pm_wakeup_event(&serio->dev, 0);
 371
 372         if (psmouse->state <= PSMOUSE_RESYNCING)
 373                 goto out;
 374
 375         if (psmouse->state == PSMOUSE_ACTIVATED &&
 376             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 377                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 378                              psmouse->name, psmouse->phys, psmouse->pktcnt);
 379                 psmouse->badbyte = psmouse->packet[0];
 380                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 381                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 382                 goto out;
 383         }
 384
 385         psmouse->packet[psmouse->pktcnt++] = data;
 386
 387         /* Check if this is a new device announcement (0xAA 0x00) */
 388         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 389                 if (psmouse->pktcnt == 1) {
 390                         psmouse->last = jiffies;
 391                         goto out;
 392                 }
 393
 394                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 395                     (psmouse->protocol->type == PSMOUSE_HGPK &&
 396                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 397                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 398                         serio_reconnect(serio);
 399                         goto out;
 400                 }
 401
 402                 /* Not a new device, try processing first byte normally */
 403                 psmouse->pktcnt = 1;
 404                 if (psmouse_handle_byte(psmouse))
 405                         goto out;
 406
 407                 psmouse->packet[psmouse->pktcnt++] = data;
 408         }
 409
 410         /*
 411          * See if we need to force resync because mouse was idle for
 412          * too long.
 413          */
 414         if (psmouse->state == PSMOUSE_ACTIVATED &&
 415             psmouse->pktcnt == 1 && psmouse->resync_time &&
 416             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 417                 psmouse->badbyte = psmouse->packet[0];
 418                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 419                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 420                 goto out;
 421         }
 422
 423         psmouse->last = jiffies;
 424         psmouse_handle_byte(psmouse);
 425
 426  out:
 427         return IRQ_HANDLED;
 428 }
 429
 430 /*
 431  * psmouse_reset() resets the mouse into power-on state.
 432  */
 433 int psmouse_reset(struct psmouse *psmouse)
 434 {
 435         u8 param[2];
 436         int error;
 437
 438         error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT);
 439         if (error)
 440                 return error;
 441
 442         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 443                 return -EIO;
 444
 445         return 0;
 446 }
 447
 448 /*
 449  * Here we set the mouse resolution.
 450  */
 451 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 452 {
 453         static const u8 params[] = { 0, 1, 2, 2, 3 };
 454         u8 p;
 455
 456         if (resolution == 0 || resolution > 200)
 457                 resolution = 200;
 458
 459         p = params[resolution / 50];
 460         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 461         psmouse->resolution = 25 << p;
 462 }
 463
 464 /*
 465  * Here we set the mouse report rate.
 466  */
 467 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 468 {
 469         static const u8 rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 470         u8 r;
 471         int i = 0;
 472
 473         while (rates[i] > rate)
 474                 i++;
 475         r = rates[i];
 476         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 477         psmouse->rate = r;
 478 }
 479
 480 /*
 481  * Here we set the mouse scaling.
 482  */
 483 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 484 {
 485         ps2_command(&psmouse->ps2dev, NULL,
 486                     scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 487                                                PSMOUSE_CMD_SETSCALE11);
 488 }
 489
 490 /*
 491  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 492  */
 493 static int psmouse_poll(struct psmouse *psmouse)
 494 {
 495         return ps2_command(&psmouse->ps2dev, psmouse->packet,
 496                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 497 }
 498
 499 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 500 {
 501         int i;
 502
 503         for (i = 0; ids[i]; i++)
 504                 if (!strcasecmp(id, ids[i]))
 505                         return true;
 506
 507         return false;
 508 }
 509
 510 /*
 511  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 512  */
 513 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 514 {
 515         struct serio *serio = psmouse->ps2dev.serio;
 516         char *p, *fw_id_copy, *save_ptr;
 517         bool found = false;
 518
 519         if (strncmp(serio->firmware_id, "PNP: ", 5))
 520                 return false;
 521
 522         fw_id_copy = kstrndup(&serio->firmware_id[5],
 523                               sizeof(serio->firmware_id) - 5,
 524                               GFP_KERNEL);
 525         if (!fw_id_copy)
 526                 return false;
 527
 528         save_ptr = fw_id_copy;
 529         while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 530                 if (psmouse_check_pnp_id(p, ids)) {
 531                         found = true;
 532                         break;
 533                 }
 534         }
 535
 536         kfree(save_ptr);
 537         return found;
 538 }
 539
 540 /*
 541  * Genius NetMouse magic init.
 542  */
 543 static int genius_detect(struct psmouse *psmouse, bool set_properties)
 544 {
 545         struct ps2dev *ps2dev = &psmouse->ps2dev;
 546         u8 param[4];
 547
 548         param[0] = 3;
 549         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 550         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 551         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 552         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 553         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 554
 555         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 556                 return -ENODEV;
 557
 558         if (set_properties) {
 559                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 560                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 561                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 562                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 563
 564                 psmouse->vendor = "Genius";
 565                 psmouse->name = "Mouse";
 566                 psmouse->pktsize = 4;
 567         }
 568
 569         return 0;
 570 }
 571
 572 /*
 573  * IntelliMouse magic init.
 574  */
 575 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 576 {
 577         struct ps2dev *ps2dev = &psmouse->ps2dev;
 578         u8 param[2];
 579
 580         param[0] = 200;
 581         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 582         param[0] = 100;
 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] != 3)
 589                 return -ENODEV;
 590
 591         if (set_properties) {
 592                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 593                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 594
 595                 if (!psmouse->vendor)
 596                         psmouse->vendor = "Generic";
 597                 if (!psmouse->name)
 598                         psmouse->name = "Wheel Mouse";
 599                 psmouse->pktsize = 4;
 600         }
 601
 602         return 0;
 603 }
 604
 605 /*
 606  * Try IntelliMouse/Explorer magic init.
 607  */
 608 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 609 {
 610         struct ps2dev *ps2dev = &psmouse->ps2dev;
 611         u8 param[2];
 612
 613         intellimouse_detect(psmouse, 0);
 614
 615         param[0] = 200;
 616         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 617         param[0] = 200;
 618         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 619         param[0] =  80;
 620         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 621         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 622
 623         if (param[0] != 4)
 624                 return -ENODEV;
 625
 626         /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 627         param[0] = 200;
 628         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 629         param[0] =  80;
 630         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 631         param[0] =  40;
 632         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 633
 634         if (set_properties) {
 635                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 636                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 637                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
 638                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 639                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 640
 641                 if (!psmouse->vendor)
 642                         psmouse->vendor = "Generic";
 643                 if (!psmouse->name)
 644                         psmouse->name = "Explorer Mouse";
 645                 psmouse->pktsize = 4;
 646         }
 647
 648         return 0;
 649 }
 650
 651 /*
 652  * Kensington ThinkingMouse / ExpertMouse magic init.
 653  */
 654 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 655 {
 656         struct ps2dev *ps2dev = &psmouse->ps2dev;
 657         u8 param[2];
 658         static const u8 seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 659         int i;
 660
 661         param[0] = 10;
 662         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 663         param[0] = 0;
 664         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 665         for (i = 0; i < ARRAY_SIZE(seq); i++) {
 666                 param[0] = seq[i];
 667                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 668         }
 669         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 670
 671         if (param[0] != 2)
 672                 return -ENODEV;
 673
 674         if (set_properties) {
 675                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 676                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 677
 678                 psmouse->vendor = "Kensington";
 679                 psmouse->name = "ThinkingMouse";
 680         }
 681
 682         return 0;
 683 }
 684
 685 /*
 686  * Bare PS/2 protocol "detection". Always succeeds.
 687  */
 688 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 689 {
 690         if (set_properties) {
 691                 if (!psmouse->vendor)
 692                         psmouse->vendor = "Generic";
 693                 if (!psmouse->name)
 694                         psmouse->name = "Mouse";
 695
 696                 /*
 697                  * We have no way of figuring true number of buttons so let's
 698                  * assume that the device has 3.
 699                  */
 700                 input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
 701         }
 702
 703         return 0;
 704 }
 705
 706 /*
 707  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 708  * must be forced by sysfs protocol writing.
 709  */
 710 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 711 {
 712         if (set_properties) {
 713                 psmouse->vendor = "Cortron";
 714                 psmouse->name = "PS/2 Trackball";
 715
 716                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 717                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 718         }
 719
 720         return 0;
 721 }
 722
 723 static const struct psmouse_protocol psmouse_protocols[] = {
 724         {
 725                 .type           = PSMOUSE_PS2,
 726                 .name           = "PS/2",
 727                 .alias          = "bare",
 728                 .maxproto       = true,
 729                 .ignore_parity  = true,
 730                 .detect         = ps2bare_detect,
 731                 .try_passthru   = true,
 732         },
 733 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 734         {
 735                 .type           = PSMOUSE_PS2PP,
 736                 .name           = "PS2++",
 737                 .alias          = "logitech",
 738                 .detect         = ps2pp_detect,
 739         },
 740 #endif
 741         {
 742                 .type           = PSMOUSE_THINKPS,
 743                 .name           = "ThinkPS/2",
 744                 .alias          = "thinkps",
 745                 .detect         = thinking_detect,
 746         },
 747 #ifdef CONFIG_MOUSE_PS2_CYPRESS
 748         {
 749                 .type           = PSMOUSE_CYPRESS,
 750                 .name           = "CyPS/2",
 751                 .alias          = "cypress",
 752                 .detect         = cypress_detect,
 753                 .init           = cypress_init,
 754         },
 755 #endif
 756         {
 757                 .type           = PSMOUSE_GENPS,
 758                 .name           = "GenPS/2",
 759                 .alias          = "genius",
 760                 .detect         = genius_detect,
 761         },
 762         {
 763                 .type           = PSMOUSE_IMPS,
 764                 .name           = "ImPS/2",
 765                 .alias          = "imps",
 766                 .maxproto       = true,
 767                 .ignore_parity  = true,
 768                 .detect         = intellimouse_detect,
 769                 .try_passthru   = true,
 770         },
 771         {
 772                 .type           = PSMOUSE_IMEX,
 773                 .name           = "ImExPS/2",
 774                 .alias          = "exps",
 775                 .maxproto       = true,
 776                 .ignore_parity  = true,
 777                 .detect         = im_explorer_detect,
 778                 .try_passthru   = true,
 779         },
 780 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 781         {
 782                 .type           = PSMOUSE_SYNAPTICS,
 783                 .name           = "SynPS/2",
 784                 .alias          = "synaptics",
 785                 .detect         = synaptics_detect,
 786                 .init           = synaptics_init_absolute,
 787         },
 788         {
 789                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
 790                 .name           = "SynRelPS/2",
 791                 .alias          = "synaptics-relative",
 792                 .detect         = synaptics_detect,
 793                 .init           = synaptics_init_relative,
 794         },
 795 #endif
 796 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
 797         {
 798                 .type           = PSMOUSE_SYNAPTICS_SMBUS,
 799                 .name           = "SynSMBus",
 800                 .alias          = "synaptics-smbus",
 801                 .detect         = synaptics_detect,
 802                 .init           = synaptics_init_smbus,
 803                 .smbus_companion = true,
 804         },
 805 #endif
 806 #ifdef CONFIG_MOUSE_PS2_ALPS
 807         {
 808                 .type           = PSMOUSE_ALPS,
 809                 .name           = "AlpsPS/2",
 810                 .alias          = "alps",
 811                 .detect         = alps_detect,
 812                 .init           = alps_init,
 813         },
 814 #endif
 815 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 816         {
 817                 .type           = PSMOUSE_LIFEBOOK,
 818                 .name           = "LBPS/2",
 819                 .alias          = "lifebook",
 820                 .detect         = lifebook_detect,
 821                 .init           = lifebook_init,
 822         },
 823 #endif
 824 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 825         {
 826                 .type           = PSMOUSE_TRACKPOINT,
 827                 .name           = "TPPS/2",
 828                 .alias          = "trackpoint",
 829                 .detect         = trackpoint_detect,
 830                 .try_passthru   = true,
 831         },
 832 #endif
 833 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 834         {
 835                 .type           = PSMOUSE_TOUCHKIT_PS2,
 836                 .name           = "touchkitPS/2",
 837                 .alias          = "touchkit",
 838                 .detect         = touchkit_ps2_detect,
 839         },
 840 #endif
 841 #ifdef CONFIG_MOUSE_PS2_OLPC
 842         {
 843                 .type           = PSMOUSE_HGPK,
 844                 .name           = "OLPC HGPK",
 845                 .alias          = "hgpk",
 846                 .detect         = hgpk_detect,
 847         },
 848 #endif
 849 #ifdef CONFIG_MOUSE_PS2_ELANTECH
 850         {
 851                 .type           = PSMOUSE_ELANTECH,
 852                 .name           = "ETPS/2",
 853                 .alias          = "elantech",
 854                 .detect         = elantech_detect,
 855                 .init           = elantech_init_ps2,
 856         },
 857 #endif
 858 #ifdef CONFIG_MOUSE_PS2_ELANTECH_SMBUS
 859         {
 860                 .type           = PSMOUSE_ELANTECH_SMBUS,
 861                 .name           = "ETSMBus",
 862                 .alias          = "elantech-smbus",
 863                 .detect         = elantech_detect,
 864                 .init           = elantech_init_smbus,
 865                 .smbus_companion = true,
 866         },
 867 #endif
 868 #ifdef CONFIG_MOUSE_PS2_SENTELIC
 869         {
 870                 .type           = PSMOUSE_FSP,
 871                 .name           = "FSPPS/2",
 872                 .alias          = "fsp",
 873                 .detect         = fsp_detect,
 874                 .init           = fsp_init,
 875         },
 876 #endif
 877         {
 878                 .type           = PSMOUSE_CORTRON,
 879                 .name           = "CortronPS/2",
 880                 .alias          = "cortps",
 881                 .detect         = cortron_detect,
 882         },
 883 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
 884         {
 885                 .type           = PSMOUSE_FOCALTECH,
 886                 .name           = "FocalTechPS/2",
 887                 .alias          = "focaltech",
 888                 .detect         = focaltech_detect,
 889                 .init           = focaltech_init,
 890         },
 891 #endif
 892 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
 893         {
 894                 .type           = PSMOUSE_VMMOUSE,
 895                 .name           = VMMOUSE_PSNAME,
 896                 .alias          = "vmmouse",
 897                 .detect         = vmmouse_detect,
 898                 .init           = vmmouse_init,
 899         },
 900 #endif
 901 #ifdef CONFIG_MOUSE_PS2_BYD
 902         {
 903                 .type           = PSMOUSE_BYD,
 904                 .name           = "BYDPS/2",
 905                 .alias          = "byd",
 906                 .detect         = byd_detect,
 907                 .init           = byd_init,
 908         },
 909 #endif
 910         {
 911                 .type           = PSMOUSE_AUTO,
 912                 .name           = "auto",
 913                 .alias          = "any",
 914                 .maxproto       = true,
 915         },
 916 };
 917
 918 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 919 {
 920         int i;
 921
 922         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 923                 if (psmouse_protocols[i].type == type)
 924                         return &psmouse_protocols[i];
 925
 926         return NULL;
 927 }
 928
 929 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 930 {
 931         const struct psmouse_protocol *proto;
 932
 933         proto = __psmouse_protocol_by_type(type);
 934         if (proto)
 935                 return proto;
 936
 937         WARN_ON(1);
 938         return &psmouse_protocols[0];
 939 }
 940
 941 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 942 {
 943         const struct psmouse_protocol *p;
 944         int i;
 945
 946         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 947                 p = &psmouse_protocols[i];
 948
 949                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 950                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 951                         return &psmouse_protocols[i];
 952         }
 953
 954         return NULL;
 955 }
 956
 957 /*
 958  * Apply default settings to the psmouse structure. Most of them will
 959  * be overridden by individual protocol initialization routines.
 960  */
 961 static void psmouse_apply_defaults(struct psmouse *psmouse)
 962 {
 963         struct input_dev *input_dev = psmouse->dev;
 964
 965         bitmap_zero(input_dev->evbit, EV_CNT);
 966         bitmap_zero(input_dev->keybit, KEY_CNT);
 967         bitmap_zero(input_dev->relbit, REL_CNT);
 968         bitmap_zero(input_dev->absbit, ABS_CNT);
 969         bitmap_zero(input_dev->mscbit, MSC_CNT);
 970
 971         input_set_capability(input_dev, EV_KEY, BTN_LEFT);
 972         input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
 973
 974         input_set_capability(input_dev, EV_REL, REL_X);
 975         input_set_capability(input_dev, EV_REL, REL_Y);
 976
 977         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 978
 979         psmouse->protocol = &psmouse_protocols[0];
 980
 981         psmouse->set_rate = psmouse_set_rate;
 982         psmouse->set_resolution = psmouse_set_resolution;
 983         psmouse->set_scale = psmouse_set_scale;
 984         psmouse->poll = psmouse_poll;
 985         psmouse->protocol_handler = psmouse_process_byte;
 986         psmouse->pktsize = 3;
 987         psmouse->reconnect = NULL;
 988         psmouse->fast_reconnect = NULL;
 989         psmouse->disconnect = NULL;
 990         psmouse->cleanup = NULL;
 991         psmouse->pt_activate = NULL;
 992         psmouse->pt_deactivate = NULL;
 993 }
 994
 995 static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
 996                               struct psmouse *psmouse, bool allow_passthrough,
 997                               bool set_properties)
 998 {
 999         if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
1000             !allow_passthrough) {
1001                 return false;
1002         }
1003
1004         if (set_properties)
1005                 psmouse_apply_defaults(psmouse);
1006
1007         return detect(psmouse, set_properties) == 0;
1008 }
1009
1010 static bool psmouse_try_protocol(struct psmouse *psmouse,
1011                                  enum psmouse_type type,
1012                                  unsigned int *max_proto,
1013                                  bool set_properties, bool init_allowed)
1014 {
1015         const struct psmouse_protocol *proto;
1016
1017         proto = __psmouse_protocol_by_type(type);
1018         if (!proto)
1019                 return false;
1020
1021         if (!psmouse_do_detect(proto->detect, psmouse, proto->try_passthru,
1022                                set_properties))
1023                 return false;
1024
1025         if (set_properties && proto->init && init_allowed) {
1026                 if (proto->init(psmouse) != 0) {
1027                         /*
1028                          * We detected device, but init failed. Adjust
1029                          * max_proto so we only try standard protocols.
1030                          */
1031                         if (*max_proto > PSMOUSE_IMEX)
1032                                 *max_proto = PSMOUSE_IMEX;
1033
1034                         return false;
1035                 }
1036         }
1037
1038         return true;
1039 }
1040
1041 /*
1042  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
1043  * the mouse may have.
1044  */
1045 static int psmouse_extensions(struct psmouse *psmouse,
1046                               unsigned int max_proto, bool set_properties)
1047 {
1048         bool synaptics_hardware = false;
1049         int ret;
1050
1051         /*
1052          * Always check for focaltech, this is safe as it uses pnp-id
1053          * matching.
1054          */
1055         if (psmouse_do_detect(focaltech_detect,
1056                               psmouse, false, set_properties)) {
1057                 if (max_proto > PSMOUSE_IMEX &&
1058                     IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
1059                     (!set_properties || focaltech_init(psmouse) == 0)) {
1060                         return PSMOUSE_FOCALTECH;
1061                 }
1062                 /*
1063                  * Restrict psmouse_max_proto so that psmouse_initialize()
1064                  * does not try to reset rate and resolution, because even
1065                  * that upsets the device.
1066                  * This also causes us to basically fall through to basic
1067                  * protocol detection, where we fully reset the mouse,
1068                  * and set it up as bare PS/2 protocol device.
1069                  */
1070                 psmouse_max_proto = max_proto = PSMOUSE_PS2;
1071         }
1072
1073         /*
1074          * We always check for LifeBook because it does not disturb mouse
1075          * (it only checks DMI information).
1076          */
1077         if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1078                                  set_properties, max_proto > PSMOUSE_IMEX))
1079                 return PSMOUSE_LIFEBOOK;
1080
1081         if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1082                                  set_properties, max_proto > PSMOUSE_IMEX))
1083                 return PSMOUSE_VMMOUSE;
1084
1085         /*
1086          * Try Kensington ThinkingMouse (we try first, because Synaptics
1087          * probe upsets the ThinkingMouse).
1088          */
1089         if (max_proto > PSMOUSE_IMEX &&
1090             psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1091                                  set_properties, true)) {
1092                 return PSMOUSE_THINKPS;
1093         }
1094
1095         /*
1096          * Try Synaptics TouchPad. Note that probing is done even if
1097          * Synaptics protocol support is disabled in config - we need to
1098          * know if it is Synaptics so we can reset it properly after
1099          * probing for IntelliMouse.
1100          */
1101         if (max_proto > PSMOUSE_PS2 &&
1102             psmouse_do_detect(synaptics_detect,
1103                               psmouse, false, set_properties)) {
1104                 synaptics_hardware = true;
1105
1106                 if (max_proto > PSMOUSE_IMEX) {
1107                         /*
1108                          * Try activating protocol, but check if support is
1109                          * enabled first, since we try detecting Synaptics
1110                          * even when protocol is disabled.
1111                          */
1112                         if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
1113                             IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
1114                                 if (!set_properties)
1115                                         return PSMOUSE_SYNAPTICS;
1116
1117                                 ret = synaptics_init(psmouse);
1118                                 if (ret >= 0)
1119                                         return ret;
1120                         }
1121
1122                         /*
1123                          * Some Synaptics touchpads can emulate extended
1124                          * protocols (like IMPS/2).  Unfortunately
1125                          * Logitech/Genius probes confuse some firmware
1126                          * versions so we'll have to skip them.
1127                          */
1128                         max_proto = PSMOUSE_IMEX;
1129                 }
1130
1131                 /*
1132                  * Make sure that touchpad is in relative mode, gestures
1133                  * (taps) are enabled.
1134                  */
1135                 synaptics_reset(psmouse);
1136         }
1137
1138         /*
1139          * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1140          * because Finger Sensing Pad probe upsets some modules of Cypress
1141          * Trackpads.
1142          */
1143         if (max_proto > PSMOUSE_IMEX &&
1144             psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1145                                  set_properties, true)) {
1146                 return PSMOUSE_CYPRESS;
1147         }
1148
1149         /* Try ALPS TouchPad */
1150         if (max_proto > PSMOUSE_IMEX) {
1151                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1152                 if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1153                                          &max_proto, set_properties, true))
1154                         return PSMOUSE_ALPS;
1155         }
1156
1157         /* Try OLPC HGPK touchpad */
1158         if (max_proto > PSMOUSE_IMEX &&
1159             psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1160                                  set_properties, true)) {
1161                 return PSMOUSE_HGPK;
1162         }
1163
1164         /* Try Elantech touchpad */
1165         if (max_proto > PSMOUSE_IMEX &&
1166             psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1167                                  &max_proto, set_properties, false)) {
1168                 if (!set_properties)
1169                         return PSMOUSE_ELANTECH;
1170
1171                 ret = elantech_init(psmouse);
1172                 if (ret >= 0)
1173                         return ret;
1174         }
1175
1176         if (max_proto > PSMOUSE_IMEX) {
1177                 if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1178                                          &max_proto, set_properties, true))
1179                         return PSMOUSE_GENPS;
1180
1181                 if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1182                                          &max_proto, set_properties, true))
1183                         return PSMOUSE_PS2PP;
1184
1185                 if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1186                                          &max_proto, set_properties, true))
1187                         return PSMOUSE_TRACKPOINT;
1188
1189                 if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1190                                          &max_proto, set_properties, true))
1191                         return PSMOUSE_TOUCHKIT_PS2;
1192         }
1193
1194         /*
1195          * Try Finger Sensing Pad. We do it here because its probe upsets
1196          * Trackpoint devices (causing TP_READ_ID command to time out).
1197          */
1198         if (max_proto > PSMOUSE_IMEX &&
1199             psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1200                                  &max_proto, set_properties, true)) {
1201                 return PSMOUSE_FSP;
1202         }
1203
1204         /*
1205          * Reset to defaults in case the device got confused by extended
1206          * protocol probes. Note that we follow up with full reset because
1207          * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1208          */
1209         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1210         psmouse_reset(psmouse);
1211
1212         if (max_proto >= PSMOUSE_IMEX &&
1213             psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1214                                  &max_proto, set_properties, true)) {
1215                 return PSMOUSE_IMEX;
1216         }
1217
1218         if (max_proto >= PSMOUSE_IMPS &&
1219             psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1220                                  &max_proto, set_properties, true)) {
1221                 return PSMOUSE_IMPS;
1222         }
1223
1224         /*
1225          * Okay, all failed, we have a standard mouse here. The number of
1226          * the buttons is still a question, though. We assume 3.
1227          */
1228         psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1229                              &max_proto, set_properties, true);
1230
1231         if (synaptics_hardware) {
1232                 /*
1233                  * We detected Synaptics hardware but it did not respond to
1234                  * IMPS/2 probes.  We need to reset the touchpad because if
1235                  * there is a track point on the pass through port it could
1236                  * get disabled while probing for protocol extensions.
1237                  */
1238                 psmouse_reset(psmouse);
1239         }
1240
1241         return PSMOUSE_PS2;
1242 }
1243
1244 /*
1245  * psmouse_probe() probes for a PS/2 mouse.
1246  */
1247 static int psmouse_probe(struct psmouse *psmouse)
1248 {
1249         struct ps2dev *ps2dev = &psmouse->ps2dev;
1250         u8 param[2];
1251         int error;
1252
1253         /*
1254          * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1255          * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1256          * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1257          * subsequent ID queries, probably due to a firmware bug.
1258          */
1259         param[0] = 0xa5;
1260         error = ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
1261         if (error)
1262                 return error;
1263
1264         if (param[0] != 0x00 && param[0] != 0x03 &&
1265             param[0] != 0x04 && param[0] != 0xff)
1266                 return -ENODEV;
1267
1268         /*
1269          * Then we reset and disable the mouse so that it doesn't generate
1270          * events.
1271          */
1272         error = ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1273         if (error)
1274                 psmouse_warn(psmouse, "Failed to reset mouse on %s: %d\n",
1275                              ps2dev->serio->phys, error);
1276
1277         return 0;
1278 }
1279
1280 /*
1281  * psmouse_initialize() initializes the mouse to a sane state.
1282  */
1283 static void psmouse_initialize(struct psmouse *psmouse)
1284 {
1285         /*
1286          * We set the mouse report rate, resolution and scaling.
1287          */
1288         if (psmouse_max_proto != PSMOUSE_PS2) {
1289                 psmouse->set_rate(psmouse, psmouse->rate);
1290                 psmouse->set_resolution(psmouse, psmouse->resolution);
1291                 psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1292         }
1293 }
1294
1295 /*
1296  * psmouse_activate() enables the mouse so that we get motion reports from it.
1297  */
1298 int psmouse_activate(struct psmouse *psmouse)
1299 {
1300         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1301                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1302                              psmouse->ps2dev.serio->phys);
1303                 return -1;
1304         }
1305
1306         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1307         return 0;
1308 }
1309
1310 /*
1311  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1312  * motion reports from it unless we explicitly request it.
1313  */
1314 int psmouse_deactivate(struct psmouse *psmouse)
1315 {
1316         int error;
1317
1318         error = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
1319         if (error) {
1320                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n",
1321                              psmouse->ps2dev.serio->phys, error);
1322                 return error;
1323         }
1324
1325         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1326         return 0;
1327 }
1328
1329 /*
1330  * psmouse_resync() attempts to re-validate current protocol.
1331  */
1332 static void psmouse_resync(struct work_struct *work)
1333 {
1334         struct psmouse *parent = NULL, *psmouse =
1335                 container_of(work, struct psmouse, resync_work.work);
1336         struct serio *serio = psmouse->ps2dev.serio;
1337         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1338         bool failed = false, enabled = false;
1339         int i;
1340
1341         mutex_lock(&psmouse_mutex);
1342
1343         if (psmouse->state != PSMOUSE_RESYNCING)
1344                 goto out;
1345
1346         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1347                 parent = serio_get_drvdata(serio->parent);
1348                 psmouse_deactivate(parent);
1349         }
1350
1351         /*
1352          * Some mice don't ACK commands sent while they are in the middle of
1353          * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1354          * instead of ps2_command() which would wait for 200ms for an ACK
1355          * that may never come.
1356          * As an additional quirk ALPS touchpads may not only forget to ACK
1357          * disable command but will stop reporting taps, so if we see that
1358          * mouse at least once ACKs disable we will do full reconnect if ACK
1359          * is missing.
1360          */
1361         psmouse->num_resyncs++;
1362
1363         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1364                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1365                         failed = true;
1366         } else
1367                 psmouse->acks_disable_command = true;
1368
1369         /*
1370          * Poll the mouse. If it was reset the packet will be shorter than
1371          * psmouse->pktsize and ps2_command will fail. We do not expect and
1372          * do not handle scenario when mouse "upgrades" its protocol while
1373          * disconnected since it would require additional delay. If we ever
1374          * see a mouse that does it we'll adjust the code.
1375          */
1376         if (!failed) {
1377                 if (psmouse->poll(psmouse))
1378                         failed = true;
1379                 else {
1380                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1381                         for (i = 0; i < psmouse->pktsize; i++) {
1382                                 psmouse->pktcnt++;
1383                                 rc = psmouse->protocol_handler(psmouse);
1384                                 if (rc != PSMOUSE_GOOD_DATA)
1385                                         break;
1386                         }
1387                         if (rc != PSMOUSE_FULL_PACKET)
1388                                 failed = true;
1389                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1390                 }
1391         }
1392
1393         /*
1394          * Now try to enable mouse. We try to do that even if poll failed
1395          * and also repeat our attempts 5 times, otherwise we may be left
1396          * out with disabled mouse.
1397          */
1398         for (i = 0; i < 5; i++) {
1399                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1400                         enabled = true;
1401                         break;
1402                 }
1403                 msleep(200);
1404         }
1405
1406         if (!enabled) {
1407                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1408                              psmouse->ps2dev.serio->phys);
1409                 failed = true;
1410         }
1411
1412         if (failed) {
1413                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1414                 psmouse_info(psmouse,
1415                              "resync failed, issuing reconnect request\n");
1416                 serio_reconnect(serio);
1417         } else
1418                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1419
1420         if (parent)
1421                 psmouse_activate(parent);
1422  out:
1423         mutex_unlock(&psmouse_mutex);
1424 }
1425
1426 /*
1427  * psmouse_cleanup() resets the mouse into power-on state.
1428  */
1429 static void psmouse_cleanup(struct serio *serio)
1430 {
1431         struct psmouse *psmouse = serio_get_drvdata(serio);
1432         struct psmouse *parent = NULL;
1433
1434         mutex_lock(&psmouse_mutex);
1435
1436         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1437                 parent = serio_get_drvdata(serio->parent);
1438                 psmouse_deactivate(parent);
1439         }
1440
1441         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1442
1443         /*
1444          * Disable stream mode so cleanup routine can proceed undisturbed.
1445          */
1446         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1447                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1448                              psmouse->ps2dev.serio->phys);
1449
1450         if (psmouse->cleanup)
1451                 psmouse->cleanup(psmouse);
1452
1453         /*
1454          * Reset the mouse to defaults (bare PS/2 protocol).
1455          */
1456         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1457
1458         /*
1459          * Some boxes, such as HP nx7400, get terribly confused if mouse
1460          * is not fully enabled before suspending/shutting down.
1461          */
1462         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1463
1464         if (parent) {
1465                 if (parent->pt_deactivate)
1466                         parent->pt_deactivate(parent);
1467
1468                 psmouse_activate(parent);
1469         }
1470
1471         mutex_unlock(&psmouse_mutex);
1472 }
1473
1474 /*
1475  * psmouse_disconnect() closes and frees.
1476  */
1477 static void psmouse_disconnect(struct serio *serio)
1478 {
1479         struct psmouse *psmouse = serio_get_drvdata(serio);
1480         struct psmouse *parent = NULL;
1481
1482         mutex_lock(&psmouse_mutex);
1483
1484         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1485
1486         /* make sure we don't have a resync in progress */
1487         mutex_unlock(&psmouse_mutex);
1488         flush_workqueue(kpsmoused_wq);
1489         mutex_lock(&psmouse_mutex);
1490
1491         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1492                 parent = serio_get_drvdata(serio->parent);
1493                 psmouse_deactivate(parent);
1494         }
1495
1496         if (psmouse->disconnect)
1497                 psmouse->disconnect(psmouse);
1498
1499         if (parent && parent->pt_deactivate)
1500                 parent->pt_deactivate(parent);
1501
1502         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1503
1504         serio_close(serio);
1505         serio_set_drvdata(serio, NULL);
1506
1507         if (psmouse->dev)
1508                 input_unregister_device(psmouse->dev);
1509
1510         kfree(psmouse);
1511
1512         if (parent)
1513                 psmouse_activate(parent);
1514
1515         mutex_unlock(&psmouse_mutex);
1516 }
1517
1518 static int psmouse_switch_protocol(struct psmouse *psmouse,
1519                                    const struct psmouse_protocol *proto)
1520 {
1521         const struct psmouse_protocol *selected_proto;
1522         struct input_dev *input_dev = psmouse->dev;
1523         enum psmouse_type type;
1524
1525         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1526
1527         if (proto && (proto->detect || proto->init)) {
1528                 psmouse_apply_defaults(psmouse);
1529
1530                 if (proto->detect && proto->detect(psmouse, true) < 0)
1531                         return -1;
1532
1533                 if (proto->init && proto->init(psmouse) < 0)
1534                         return -1;
1535
1536                 selected_proto = proto;
1537         } else {
1538                 type = psmouse_extensions(psmouse, psmouse_max_proto, true);
1539                 selected_proto = psmouse_protocol_by_type(type);
1540         }
1541
1542         psmouse->protocol = selected_proto;
1543
1544         /*
1545          * If mouse's packet size is 3 there is no point in polling the
1546          * device in hopes to detect protocol reset - we won't get less
1547          * than 3 bytes response anyhow.
1548          */
1549         if (psmouse->pktsize == 3)
1550                 psmouse->resync_time = 0;
1551
1552         /*
1553          * Some smart KVMs fake response to POLL command returning just
1554          * 3 bytes and messing up our resync logic, so if initial poll
1555          * fails we won't try polling the device anymore. Hopefully
1556          * such KVM will maintain initially selected protocol.
1557          */
1558         if (psmouse->resync_time && psmouse->poll(psmouse))
1559                 psmouse->resync_time = 0;
1560
1561         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1562                  selected_proto->name, psmouse->vendor, psmouse->name);
1563
1564         input_dev->name = psmouse->devname;
1565         input_dev->phys = psmouse->phys;
1566         input_dev->id.bustype = BUS_I8042;
1567         input_dev->id.vendor = 0x0002;
1568         input_dev->id.product = psmouse->protocol->type;
1569         input_dev->id.version = psmouse->model;
1570
1571         return 0;
1572 }
1573
1574 /*
1575  * psmouse_connect() is a callback from the serio module when
1576  * an unhandled serio port is found.
1577  */
1578 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1579 {
1580         struct psmouse *psmouse, *parent = NULL;
1581         struct input_dev *input_dev;
1582         int retval = 0, error = -ENOMEM;
1583
1584         mutex_lock(&psmouse_mutex);
1585
1586         /*
1587          * If this is a pass-through port deactivate parent so the device
1588          * connected to this port can be successfully identified
1589          */
1590         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1591                 parent = serio_get_drvdata(serio->parent);
1592                 psmouse_deactivate(parent);
1593         }
1594
1595         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1596         input_dev = input_allocate_device();
1597         if (!psmouse || !input_dev)
1598                 goto err_free;
1599
1600         ps2_init(&psmouse->ps2dev, serio);
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         serio_set_drvdata(serio, psmouse);
1608
1609         error = serio_open(serio, drv);
1610         if (error)
1611                 goto err_clear_drvdata;
1612
1613         /* give PT device some time to settle down before probing */
1614         if (serio->id.type == SERIO_PS_PSTHRU)
1615                 usleep_range(10000, 15000);
1616
1617         if (psmouse_probe(psmouse) < 0) {
1618                 error = -ENODEV;
1619                 goto err_close_serio;
1620         }
1621
1622         psmouse->rate = psmouse_rate;
1623         psmouse->resolution = psmouse_resolution;
1624         psmouse->resetafter = psmouse_resetafter;
1625         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1626         psmouse->smartscroll = psmouse_smartscroll;
1627
1628         psmouse_switch_protocol(psmouse, NULL);
1629
1630         if (!psmouse->protocol->smbus_companion) {
1631                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1632                 psmouse_initialize(psmouse);
1633
1634                 error = input_register_device(input_dev);
1635                 if (error)
1636                         goto err_protocol_disconnect;
1637         } else {
1638                 /* Smbus companion will be reporting events, not us. */
1639                 input_free_device(input_dev);
1640                 psmouse->dev = input_dev = NULL;
1641         }
1642
1643         if (parent && parent->pt_activate)
1644                 parent->pt_activate(parent);
1645
1646         /*
1647          * PS/2 devices having SMBus companions should stay disabled
1648          * on PS/2 side, in order to have SMBus part operable.
1649          */
1650         if (!psmouse->protocol->smbus_companion)
1651                 psmouse_activate(psmouse);
1652
1653  out:
1654         /* If this is a pass-through port the parent needs to be re-activated */
1655         if (parent)
1656                 psmouse_activate(parent);
1657
1658         mutex_unlock(&psmouse_mutex);
1659         return retval;
1660
1661  err_protocol_disconnect:
1662         if (psmouse->disconnect)
1663                 psmouse->disconnect(psmouse);
1664         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1665  err_close_serio:
1666         serio_close(serio);
1667  err_clear_drvdata:
1668         serio_set_drvdata(serio, NULL);
1669  err_free:
1670         input_free_device(input_dev);
1671         kfree(psmouse);
1672
1673         retval = error;
1674         goto out;
1675 }
1676
1677 static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
1678 {
1679         struct psmouse *psmouse = serio_get_drvdata(serio);
1680         struct psmouse *parent = NULL;
1681         int (*reconnect_handler)(struct psmouse *);
1682         enum psmouse_type type;
1683         int rc = -1;
1684
1685         mutex_lock(&psmouse_mutex);
1686
1687         if (fast_reconnect) {
1688                 reconnect_handler = psmouse->fast_reconnect;
1689                 if (!reconnect_handler) {
1690                         rc = -ENOENT;
1691                         goto out_unlock;
1692                 }
1693         } else {
1694                 reconnect_handler = psmouse->reconnect;
1695         }
1696
1697         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1698                 parent = serio_get_drvdata(serio->parent);
1699                 psmouse_deactivate(parent);
1700         }
1701
1702         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1703
1704         if (reconnect_handler) {
1705                 if (reconnect_handler(psmouse))
1706                         goto out;
1707         } else {
1708                 psmouse_reset(psmouse);
1709
1710                 if (psmouse_probe(psmouse) < 0)
1711                         goto out;
1712
1713                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1714                 if (psmouse->protocol->type != type)
1715                         goto out;
1716         }
1717
1718         /*
1719          * OK, the device type (and capabilities) match the old one,
1720          * we can continue using it, complete initialization
1721          */
1722         if (!psmouse->protocol->smbus_companion) {
1723                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1724                 psmouse_initialize(psmouse);
1725         }
1726
1727         if (parent && parent->pt_activate)
1728                 parent->pt_activate(parent);
1729
1730         /*
1731          * PS/2 devices having SMBus companions should stay disabled
1732          * on PS/2 side, in order to have SMBus part operable.
1733          */
1734         if (!psmouse->protocol->smbus_companion)
1735                 psmouse_activate(psmouse);
1736
1737         rc = 0;
1738
1739 out:
1740         /* If this is a pass-through port the parent waits to be activated */
1741         if (parent)
1742                 psmouse_activate(parent);
1743
1744 out_unlock:
1745         mutex_unlock(&psmouse_mutex);
1746         return rc;
1747 }
1748
1749 static int psmouse_reconnect(struct serio *serio)
1750 {
1751         return __psmouse_reconnect(serio, false);
1752 }
1753
1754 static int psmouse_fast_reconnect(struct serio *serio)
1755 {
1756         return __psmouse_reconnect(serio, true);
1757 }
1758
1759 static struct serio_device_id psmouse_serio_ids[] = {
1760         {
1761                 .type   = SERIO_8042,
1762                 .proto  = SERIO_ANY,
1763                 .id     = SERIO_ANY,
1764                 .extra  = SERIO_ANY,
1765         },
1766         {
1767                 .type   = SERIO_PS_PSTHRU,
1768                 .proto  = SERIO_ANY,
1769                 .id     = SERIO_ANY,
1770                 .extra  = SERIO_ANY,
1771         },
1772         { 0 }
1773 };
1774
1775 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1776
1777 static struct serio_driver psmouse_drv = {
1778         .driver         = {
1779                 .name           = "psmouse",
1780                 .dev_groups     = psmouse_dev_groups,
1781         },
1782         .description    = DRIVER_DESC,
1783         .id_table       = psmouse_serio_ids,
1784         .interrupt      = psmouse_interrupt,
1785         .connect        = psmouse_connect,
1786         .reconnect      = psmouse_reconnect,
1787         .fast_reconnect = psmouse_fast_reconnect,
1788         .disconnect     = psmouse_disconnect,
1789         .cleanup        = psmouse_cleanup,
1790 };
1791
1792 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1793                                  char *buf)
1794 {
1795         struct serio *serio = to_serio_port(dev);
1796         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1797         struct psmouse *psmouse = serio_get_drvdata(serio);
1798
1799         if (psmouse->protocol->smbus_companion &&
1800                         devattr != &psmouse_attr_protocol.dattr)
1801                 return -ENOENT;
1802
1803         return attr->show(psmouse, attr->data, buf);
1804 }
1805
1806 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1807                                 const char *buf, size_t count)
1808 {
1809         struct serio *serio = to_serio_port(dev);
1810         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1811         struct psmouse *psmouse, *parent = NULL;
1812         int retval;
1813
1814         retval = mutex_lock_interruptible(&psmouse_mutex);
1815         if (retval)
1816                 goto out;
1817
1818         psmouse = serio_get_drvdata(serio);
1819
1820         if (psmouse->protocol->smbus_companion &&
1821                         devattr != &psmouse_attr_protocol.dattr) {
1822                 retval = -ENOENT;
1823                 goto out_unlock;
1824         }
1825
1826         if (attr->protect) {
1827                 if (psmouse->state == PSMOUSE_IGNORE) {
1828                         retval = -ENODEV;
1829                         goto out_unlock;
1830                 }
1831
1832                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1833                         parent = serio_get_drvdata(serio->parent);
1834                         psmouse_deactivate(parent);
1835                 }
1836
1837                 if (!psmouse->protocol->smbus_companion)
1838                         psmouse_deactivate(psmouse);
1839         }
1840
1841         retval = attr->set(psmouse, attr->data, buf, count);
1842
1843         if (attr->protect) {
1844                 if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
1845                         psmouse_activate(psmouse);
1846
1847                 if (parent)
1848                         psmouse_activate(parent);
1849         }
1850
1851  out_unlock:
1852         mutex_unlock(&psmouse_mutex);
1853  out:
1854         return retval;
1855 }
1856
1857 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1858 {
1859         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1860
1861         return sprintf(buf, "%u\n", *field);
1862 }
1863
1864 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1865 {
1866         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1867         unsigned int value;
1868         int err;
1869
1870         err = kstrtouint(buf, 10, &value);
1871         if (err)
1872                 return err;
1873
1874         *field = value;
1875
1876         return count;
1877 }
1878
1879 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1880 {
1881         return sprintf(buf, "%s\n", psmouse->protocol->name);
1882 }
1883
1884 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1885 {
1886         struct serio *serio = psmouse->ps2dev.serio;
1887         struct psmouse *parent = NULL;
1888         struct input_dev *old_dev, *new_dev;
1889         const struct psmouse_protocol *proto, *old_proto;
1890         int error;
1891         int retry = 0;
1892
1893         proto = psmouse_protocol_by_name(buf, count);
1894         if (!proto)
1895                 return -EINVAL;
1896
1897         if (psmouse->protocol == proto)
1898                 return count;
1899
1900         new_dev = input_allocate_device();
1901         if (!new_dev)
1902                 return -ENOMEM;
1903
1904         while (!list_empty(&serio->children)) {
1905                 if (++retry > 3) {
1906                         psmouse_warn(psmouse,
1907                                      "failed to destroy children ports, protocol change aborted.\n");
1908                         input_free_device(new_dev);
1909                         return -EIO;
1910                 }
1911
1912                 mutex_unlock(&psmouse_mutex);
1913                 serio_unregister_child_port(serio);
1914                 mutex_lock(&psmouse_mutex);
1915
1916                 if (serio->drv != &psmouse_drv) {
1917                         input_free_device(new_dev);
1918                         return -ENODEV;
1919                 }
1920
1921                 if (psmouse->protocol == proto) {
1922                         input_free_device(new_dev);
1923                         return count; /* switched by other thread */
1924                 }
1925         }
1926
1927         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1928                 parent = serio_get_drvdata(serio->parent);
1929                 if (parent->pt_deactivate)
1930                         parent->pt_deactivate(parent);
1931         }
1932
1933         old_dev = psmouse->dev;
1934         old_proto = psmouse->protocol;
1935
1936         if (psmouse->disconnect)
1937                 psmouse->disconnect(psmouse);
1938
1939         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1940
1941         psmouse->dev = new_dev;
1942         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1943
1944         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1945                 psmouse_reset(psmouse);
1946                 /* default to PSMOUSE_PS2 */
1947                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1948         }
1949
1950         psmouse_initialize(psmouse);
1951         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1952
1953         if (psmouse->protocol->smbus_companion) {
1954                 input_free_device(psmouse->dev);
1955                 psmouse->dev = NULL;
1956         } else {
1957                 error = input_register_device(psmouse->dev);
1958                 if (error) {
1959                         if (psmouse->disconnect)
1960                                 psmouse->disconnect(psmouse);
1961
1962                         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1963                         input_free_device(new_dev);
1964                         psmouse->dev = old_dev;
1965                         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1966                         psmouse_switch_protocol(psmouse, old_proto);
1967                         psmouse_initialize(psmouse);
1968                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1969
1970                         return error;
1971                 }
1972         }
1973
1974         if (old_dev)
1975                 input_unregister_device(old_dev);
1976
1977         if (parent && parent->pt_activate)
1978                 parent->pt_activate(parent);
1979
1980         return count;
1981 }
1982
1983 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1984 {
1985         unsigned int value;
1986         int err;
1987
1988         err = kstrtouint(buf, 10, &value);
1989         if (err)
1990                 return err;
1991
1992         psmouse->set_rate(psmouse, value);
1993         return count;
1994 }
1995
1996 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1997 {
1998         unsigned int value;
1999         int err;
2000
2001         err = kstrtouint(buf, 10, &value);
2002         if (err)
2003                 return err;
2004
2005         psmouse->set_resolution(psmouse, value);
2006         return count;
2007 }
2008
2009
2010 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
2011 {
2012         const struct psmouse_protocol *proto;
2013
2014         if (!val)
2015                 return -EINVAL;
2016
2017         proto = psmouse_protocol_by_name(val, strlen(val));
2018
2019         if (!proto || !proto->maxproto)
2020                 return -EINVAL;
2021
2022         *((unsigned int *)kp->arg) = proto->type;
2023
2024         return 0;
2025 }
2026
2027 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
2028 {
2029         int type = *((unsigned int *)kp->arg);
2030
2031         return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
2032 }
2033
2034 static int __init psmouse_init(void)
2035 {
2036         int err;
2037
2038         lifebook_module_init();
2039         synaptics_module_init();
2040         hgpk_module_init();
2041
2042         err = psmouse_smbus_module_init();
2043         if (err)
2044                 return err;
2045
2046         kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
2047         if (!kpsmoused_wq) {
2048                 pr_err("failed to create kpsmoused workqueue\n");
2049                 err = -ENOMEM;
2050                 goto err_smbus_exit;
2051         }
2052
2053         err = serio_register_driver(&psmouse_drv);
2054         if (err)
2055                 goto err_destroy_wq;
2056
2057         return 0;
2058
2059 err_destroy_wq:
2060         destroy_workqueue(kpsmoused_wq);
2061 err_smbus_exit:
2062         psmouse_smbus_module_exit();
2063         return err;
2064 }
2065
2066 static void __exit psmouse_exit(void)
2067 {
2068         serio_unregister_driver(&psmouse_drv);
2069         destroy_workqueue(kpsmoused_wq);
2070         psmouse_smbus_module_exit();
2071 }
2072
2073 module_init(psmouse_init);
2074 module_exit(psmouse_exit);