drivers/input/mouse/psmouse-base.c

   1 /*
   2  * PS/2 mouse driver
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  * Copyright (c) 2003-2004 Dmitry Torokhov
   6  */
   7
   8 /*
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published by
  11  * the Free Software Foundation.
  12  */
  13
  14 #define pr_fmt(fmt)             KBUILD_MODNAME ": " fmt
  15 #define psmouse_fmt(fmt)        fmt
  16
  17 #include <linux/delay.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/input.h>
  22 #include <linux/serio.h>
  23 #include <linux/init.h>
  24 #include <linux/libps2.h>
  25 #include <linux/mutex.h>
  26
  27 #include "psmouse.h"
  28 #include "synaptics.h"
  29 #include "logips2pp.h"
  30 #include "alps.h"
  31 #include "hgpk.h"
  32 #include "lifebook.h"
  33 #include "trackpoint.h"
  34 #include "touchkit_ps2.h"
  35 #include "elantech.h"
  36 #include "sentelic.h"
  37 #include "cypress_ps2.h"
  38 #include "focaltech.h"
  39 #include "vmmouse.h"
  40
  41 #define DRIVER_DESC     "PS/2 mouse driver"
  42
  43 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  44 MODULE_DESCRIPTION(DRIVER_DESC);
  45 MODULE_LICENSE("GPL");
  46
  47 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
  48 static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
  49 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
  50 static const struct kernel_param_ops param_ops_proto_abbrev = {
  51         .set = psmouse_set_maxproto,
  52         .get = psmouse_get_maxproto,
  53 };
  54 #define param_check_proto_abbrev(name, p)       __param_check(name, p, unsigned int)
  55 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
  56 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
  57
  58 static unsigned int psmouse_resolution = 200;
  59 module_param_named(resolution, psmouse_resolution, uint, 0644);
  60 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
  61
  62 static unsigned int psmouse_rate = 100;
  63 module_param_named(rate, psmouse_rate, uint, 0644);
  64 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
  65
  66 static bool psmouse_smartscroll = true;
  67 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
  68 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
  69
  70 static unsigned int psmouse_resetafter = 5;
  71 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
  72 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
  73
  74 static unsigned int psmouse_resync_time;
  75 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
  76 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
  77
  78 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
  79                         NULL,
  80                         psmouse_attr_show_protocol, psmouse_attr_set_protocol);
  81 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
  82                         (void *) offsetof(struct psmouse, rate),
  83                         psmouse_show_int_attr, psmouse_attr_set_rate);
  84 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
  85                         (void *) offsetof(struct psmouse, resolution),
  86                         psmouse_show_int_attr, psmouse_attr_set_resolution);
  87 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
  88                         (void *) offsetof(struct psmouse, resetafter),
  89                         psmouse_show_int_attr, psmouse_set_int_attr);
  90 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
  91                         (void *) offsetof(struct psmouse, resync_time),
  92                         psmouse_show_int_attr, psmouse_set_int_attr);
  93
  94 static struct attribute *psmouse_attributes[] = {
  95         &psmouse_attr_protocol.dattr.attr,
  96         &psmouse_attr_rate.dattr.attr,
  97         &psmouse_attr_resolution.dattr.attr,
  98         &psmouse_attr_resetafter.dattr.attr,
  99         &psmouse_attr_resync_time.dattr.attr,
 100         NULL
 101 };
 102
 103 static struct attribute_group psmouse_attribute_group = {
 104         .attrs  = psmouse_attributes,
 105 };
 106
 107 /*
 108  * psmouse_mutex protects all operations changing state of mouse
 109  * (connecting, disconnecting, changing rate or resolution via
 110  * sysfs). We could use a per-device semaphore but since there
 111  * rarely more than one PS/2 mouse connected and since semaphore
 112  * is taken in "slow" paths it is not worth it.
 113  */
 114 static DEFINE_MUTEX(psmouse_mutex);
 115
 116 static struct workqueue_struct *kpsmoused_wq;
 117
 118 struct psmouse_protocol {
 119         enum psmouse_type type;
 120         bool maxproto;
 121         bool ignore_parity; /* Protocol should ignore parity errors from KBC */
 122         bool try_passthru; /* Try protocol also on passthrough ports */
 123         const char *name;
 124         const char *alias;
 125         int (*detect)(struct psmouse *, bool);
 126         int (*init)(struct psmouse *);
 127 };
 128
 129 /*
 130  * psmouse_process_byte() analyzes the PS/2 data stream and reports
 131  * relevant events to the input module once full packet has arrived.
 132  */
 133 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 134 {
 135         struct input_dev *dev = psmouse->dev;
 136         unsigned char *packet = psmouse->packet;
 137
 138         if (psmouse->pktcnt < psmouse->pktsize)
 139                 return PSMOUSE_GOOD_DATA;
 140
 141         /* Full packet accumulated, process it */
 142
 143         switch (psmouse->type) {
 144         case PSMOUSE_IMPS:
 145                 /* IntelliMouse has scroll wheel */
 146                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 147                 break;
 148
 149         case PSMOUSE_IMEX:
 150                 /* Scroll wheel and buttons on IntelliMouse Explorer */
 151                 switch (packet[3] & 0xC0) {
 152                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 153                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 154                         break;
 155                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 156                         input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 157                         break;
 158                 case 0x00:
 159                 case 0xC0:
 160                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
 161                         input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
 162                         input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
 163                         break;
 164                 }
 165                 break;
 166
 167         case PSMOUSE_GENPS:
 168                 /* Report scroll buttons on NetMice */
 169                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 170
 171                 /* Extra buttons on Genius NewNet 3D */
 172                 input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
 173                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
 174                 break;
 175
 176         case PSMOUSE_THINKPS:
 177                 /* Extra button on ThinkingMouse */
 178                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
 179
 180                 /*
 181                  * Without this bit of weirdness moving up gives wildly
 182                  * high Y changes.
 183                  */
 184                 packet[1] |= (packet[0] & 0x40) << 1;
 185                 break;
 186
 187         case PSMOUSE_CORTRON:
 188                 /*
 189                  * Cortron PS2 Trackball reports SIDE button in the
 190                  * 4th bit of the first byte.
 191                  */
 192                 input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
 193                 packet[0] |= 0x08;
 194                 break;
 195
 196         default:
 197                 break;
 198         }
 199
 200         /* Generic PS/2 Mouse */
 201         input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
 202         input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
 203         input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);
 204
 205         input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
 206         input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
 207
 208         input_sync(dev);
 209
 210         return PSMOUSE_FULL_PACKET;
 211 }
 212
 213 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 214                 unsigned long delay)
 215 {
 216         queue_delayed_work(kpsmoused_wq, work, delay);
 217 }
 218
 219 /*
 220  * __psmouse_set_state() sets new psmouse state and resets all flags.
 221  */
 222 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 223 {
 224         psmouse->state = new_state;
 225         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 226         psmouse->ps2dev.flags = 0;
 227         psmouse->last = jiffies;
 228 }
 229
 230 /*
 231  * psmouse_set_state() sets new psmouse state and resets all flags and
 232  * counters while holding serio lock so fighting with interrupt handler
 233  * is not a concern.
 234  */
 235 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 236 {
 237         serio_pause_rx(psmouse->ps2dev.serio);
 238         __psmouse_set_state(psmouse, new_state);
 239         serio_continue_rx(psmouse->ps2dev.serio);
 240 }
 241
 242 /*
 243  * psmouse_handle_byte() processes one byte of the input data stream
 244  * by calling corresponding protocol handler.
 245  */
 246 static int psmouse_handle_byte(struct psmouse *psmouse)
 247 {
 248         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 249
 250         switch (rc) {
 251         case PSMOUSE_BAD_DATA:
 252                 if (psmouse->state == PSMOUSE_ACTIVATED) {
 253                         psmouse_warn(psmouse,
 254                                      "%s at %s lost sync at byte %d\n",
 255                                      psmouse->name, psmouse->phys,
 256                                      psmouse->pktcnt);
 257                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 258                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 259                                 psmouse_notice(psmouse,
 260                                                 "issuing reconnect request\n");
 261                                 serio_reconnect(psmouse->ps2dev.serio);
 262                                 return -1;
 263                         }
 264                 }
 265                 psmouse->pktcnt = 0;
 266                 break;
 267
 268         case PSMOUSE_FULL_PACKET:
 269                 psmouse->pktcnt = 0;
 270                 if (psmouse->out_of_sync_cnt) {
 271                         psmouse->out_of_sync_cnt = 0;
 272                         psmouse_notice(psmouse,
 273                                         "%s at %s - driver resynced.\n",
 274                                         psmouse->name, psmouse->phys);
 275                 }
 276                 break;
 277
 278         case PSMOUSE_GOOD_DATA:
 279                 break;
 280         }
 281         return 0;
 282 }
 283
 284 /*
 285  * psmouse_interrupt() handles incoming characters, either passing them
 286  * for normal processing or gathering them as command response.
 287  */
 288 static irqreturn_t psmouse_interrupt(struct serio *serio,
 289                 unsigned char data, unsigned int flags)
 290 {
 291         struct psmouse *psmouse = serio_get_drvdata(serio);
 292
 293         if (psmouse->state == PSMOUSE_IGNORE)
 294                 goto out;
 295
 296         if (unlikely((flags & SERIO_TIMEOUT) ||
 297                      ((flags & SERIO_PARITY) && !psmouse->ignore_parity))) {
 298
 299                 if (psmouse->state == PSMOUSE_ACTIVATED)
 300                         psmouse_warn(psmouse,
 301                                      "bad data from KBC -%s%s\n",
 302                                      flags & SERIO_TIMEOUT ? " timeout" : "",
 303                                      flags & SERIO_PARITY ? " bad parity" : "");
 304                 ps2_cmd_aborted(&psmouse->ps2dev);
 305                 goto out;
 306         }
 307
 308         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
 309                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
 310                         goto out;
 311
 312         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
 313                 if  (ps2_handle_response(&psmouse->ps2dev, data))
 314                         goto out;
 315
 316         if (psmouse->state <= PSMOUSE_RESYNCING)
 317                 goto out;
 318
 319         if (psmouse->state == PSMOUSE_ACTIVATED &&
 320             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 321                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 322                              psmouse->name, psmouse->phys, psmouse->pktcnt);
 323                 psmouse->badbyte = psmouse->packet[0];
 324                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 325                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 326                 goto out;
 327         }
 328
 329         psmouse->packet[psmouse->pktcnt++] = data;
 330
 331         /* Check if this is a new device announcement (0xAA 0x00) */
 332         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 333                 if (psmouse->pktcnt == 1) {
 334                         psmouse->last = jiffies;
 335                         goto out;
 336                 }
 337
 338                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 339                     (psmouse->type == PSMOUSE_HGPK &&
 340                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 341                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 342                         serio_reconnect(serio);
 343                         goto out;
 344                 }
 345
 346                 /* Not a new device, try processing first byte normally */
 347                 psmouse->pktcnt = 1;
 348                 if (psmouse_handle_byte(psmouse))
 349                         goto out;
 350
 351                 psmouse->packet[psmouse->pktcnt++] = data;
 352         }
 353
 354         /*
 355          * See if we need to force resync because mouse was idle for
 356          * too long.
 357          */
 358         if (psmouse->state == PSMOUSE_ACTIVATED &&
 359             psmouse->pktcnt == 1 && psmouse->resync_time &&
 360             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 361                 psmouse->badbyte = psmouse->packet[0];
 362                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 363                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 364                 goto out;
 365         }
 366
 367         psmouse->last = jiffies;
 368         psmouse_handle_byte(psmouse);
 369
 370  out:
 371         return IRQ_HANDLED;
 372 }
 373
 374 /*
 375  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
 376  * using sliced syntax, understood by advanced devices, such as Logitech
 377  * or Synaptics touchpads. The command is encoded as:
 378  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
 379  * is the command.
 380  */
 381 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
 382 {
 383         int i;
 384
 385         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
 386                 return -1;
 387
 388         for (i = 6; i >= 0; i -= 2) {
 389                 unsigned char d = (command >> i) & 3;
 390                 if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
 391                         return -1;
 392         }
 393
 394         return 0;
 395 }
 396
 397 /*
 398  * psmouse_reset() resets the mouse into power-on state.
 399  */
 400 int psmouse_reset(struct psmouse *psmouse)
 401 {
 402         unsigned char param[2];
 403
 404         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
 405                 return -1;
 406
 407         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 408                 return -1;
 409
 410         return 0;
 411 }
 412
 413 /*
 414  * Here we set the mouse resolution.
 415  */
 416 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 417 {
 418         static const unsigned char params[] = { 0, 1, 2, 2, 3 };
 419         unsigned char p;
 420
 421         if (resolution == 0 || resolution > 200)
 422                 resolution = 200;
 423
 424         p = params[resolution / 50];
 425         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 426         psmouse->resolution = 25 << p;
 427 }
 428
 429 /*
 430  * Here we set the mouse report rate.
 431  */
 432 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 433 {
 434         static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 435         unsigned char r;
 436         int i = 0;
 437
 438         while (rates[i] > rate) i++;
 439         r = rates[i];
 440         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 441         psmouse->rate = r;
 442 }
 443
 444 /*
 445  * Here we set the mouse scaling.
 446  */
 447 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 448 {
 449         ps2_command(&psmouse->ps2dev, NULL,
 450                     scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 451                                                PSMOUSE_CMD_SETSCALE11);
 452 }
 453
 454 /*
 455  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 456  */
 457 static int psmouse_poll(struct psmouse *psmouse)
 458 {
 459         return ps2_command(&psmouse->ps2dev, psmouse->packet,
 460                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 461 }
 462
 463 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 464 {
 465         int i;
 466
 467         for (i = 0; ids[i]; i++)
 468                 if (!strcasecmp(id, ids[i]))
 469                         return true;
 470
 471         return false;
 472 }
 473
 474 /*
 475  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 476  */
 477 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 478 {
 479         struct serio *serio = psmouse->ps2dev.serio;
 480         char *p, *fw_id_copy, *save_ptr;
 481         bool found = false;
 482
 483         if (strncmp(serio->firmware_id, "PNP: ", 5))
 484                 return false;
 485
 486         fw_id_copy = kstrndup(&serio->firmware_id[5],
 487                               sizeof(serio->firmware_id) - 5,
 488                               GFP_KERNEL);
 489         if (!fw_id_copy)
 490                 return false;
 491
 492         save_ptr = fw_id_copy;
 493         while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 494                 if (psmouse_check_pnp_id(p, ids)) {
 495                         found = true;
 496                         break;
 497                 }
 498         }
 499
 500         kfree(save_ptr);
 501         return found;
 502 }
 503
 504 /*
 505  * Genius NetMouse magic init.
 506  */
 507 static int genius_detect(struct psmouse *psmouse, bool set_properties)
 508 {
 509         struct ps2dev *ps2dev = &psmouse->ps2dev;
 510         unsigned char param[4];
 511
 512         param[0] = 3;
 513         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 514         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 515         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 516         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 517         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 518
 519         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 520                 return -1;
 521
 522         if (set_properties) {
 523                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 524                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 525                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 526                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 527
 528                 psmouse->vendor = "Genius";
 529                 psmouse->name = "Mouse";
 530                 psmouse->pktsize = 4;
 531         }
 532
 533         return 0;
 534 }
 535
 536 /*
 537  * IntelliMouse magic init.
 538  */
 539 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 540 {
 541         struct ps2dev *ps2dev = &psmouse->ps2dev;
 542         unsigned char param[2];
 543
 544         param[0] = 200;
 545         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 546         param[0] = 100;
 547         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 548         param[0] =  80;
 549         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 550         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 551
 552         if (param[0] != 3)
 553                 return -1;
 554
 555         if (set_properties) {
 556                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 557                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 558
 559                 if (!psmouse->vendor)
 560                         psmouse->vendor = "Generic";
 561                 if (!psmouse->name)
 562                         psmouse->name = "Wheel Mouse";
 563                 psmouse->pktsize = 4;
 564         }
 565
 566         return 0;
 567 }
 568
 569 /*
 570  * Try IntelliMouse/Explorer magic init.
 571  */
 572 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 573 {
 574         struct ps2dev *ps2dev = &psmouse->ps2dev;
 575         unsigned char param[2];
 576
 577         intellimouse_detect(psmouse, 0);
 578
 579         param[0] = 200;
 580         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 581         param[0] = 200;
 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] != 4)
 588                 return -1;
 589
 590         /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 591         param[0] = 200;
 592         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 593         param[0] =  80;
 594         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 595         param[0] =  40;
 596         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 597
 598         if (set_properties) {
 599                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 600                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 601                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
 602                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 603                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 604
 605                 if (!psmouse->vendor)
 606                         psmouse->vendor = "Generic";
 607                 if (!psmouse->name)
 608                         psmouse->name = "Explorer Mouse";
 609                 psmouse->pktsize = 4;
 610         }
 611
 612         return 0;
 613 }
 614
 615 /*
 616  * Kensington ThinkingMouse / ExpertMouse magic init.
 617  */
 618 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 619 {
 620         struct ps2dev *ps2dev = &psmouse->ps2dev;
 621         unsigned char param[2];
 622         static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 623         int i;
 624
 625         param[0] = 10;
 626         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 627         param[0] = 0;
 628         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 629         for (i = 0; i < ARRAY_SIZE(seq); i++) {
 630                 param[0] = seq[i];
 631                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 632         }
 633         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 634
 635         if (param[0] != 2)
 636                 return -1;
 637
 638         if (set_properties) {
 639                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 640                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 641
 642                 psmouse->vendor = "Kensington";
 643                 psmouse->name = "ThinkingMouse";
 644         }
 645
 646         return 0;
 647 }
 648
 649 /*
 650  * Bare PS/2 protocol "detection". Always succeeds.
 651  */
 652 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 653 {
 654         if (set_properties) {
 655                 if (!psmouse->vendor)
 656                         psmouse->vendor = "Generic";
 657                 if (!psmouse->name)
 658                         psmouse->name = "Mouse";
 659
 660                 /*
 661                  * We have no way of figuring true number of buttons so let's
 662                  * assume that the device has 3.
 663                  */
 664                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 665         }
 666
 667         return 0;
 668 }
 669
 670 /*
 671  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 672  * must be forced by sysfs protocol writing.
 673  */
 674 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 675 {
 676         if (set_properties) {
 677                 psmouse->vendor = "Cortron";
 678                 psmouse->name = "PS/2 Trackball";
 679
 680                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 681                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 682         }
 683
 684         return 0;
 685 }
 686
 687 static const struct psmouse_protocol psmouse_protocols[] = {
 688         {
 689                 .type           = PSMOUSE_PS2,
 690                 .name           = "PS/2",
 691                 .alias          = "bare",
 692                 .maxproto       = true,
 693                 .ignore_parity  = true,
 694                 .detect         = ps2bare_detect,
 695                 .try_passthru   = true,
 696         },
 697 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 698         {
 699                 .type           = PSMOUSE_PS2PP,
 700                 .name           = "PS2++",
 701                 .alias          = "logitech",
 702                 .detect         = ps2pp_detect,
 703         },
 704 #endif
 705         {
 706                 .type           = PSMOUSE_THINKPS,
 707                 .name           = "ThinkPS/2",
 708                 .alias          = "thinkps",
 709                 .detect         = thinking_detect,
 710         },
 711 #ifdef CONFIG_MOUSE_PS2_CYPRESS
 712         {
 713                 .type           = PSMOUSE_CYPRESS,
 714                 .name           = "CyPS/2",
 715                 .alias          = "cypress",
 716                 .detect         = cypress_detect,
 717                 .init           = cypress_init,
 718         },
 719 #endif
 720         {
 721                 .type           = PSMOUSE_GENPS,
 722                 .name           = "GenPS/2",
 723                 .alias          = "genius",
 724                 .detect         = genius_detect,
 725         },
 726         {
 727                 .type           = PSMOUSE_IMPS,
 728                 .name           = "ImPS/2",
 729                 .alias          = "imps",
 730                 .maxproto       = true,
 731                 .ignore_parity  = true,
 732                 .detect         = intellimouse_detect,
 733                 .try_passthru   = true,
 734         },
 735         {
 736                 .type           = PSMOUSE_IMEX,
 737                 .name           = "ImExPS/2",
 738                 .alias          = "exps",
 739                 .maxproto       = true,
 740                 .ignore_parity  = true,
 741                 .detect         = im_explorer_detect,
 742                 .try_passthru   = true,
 743         },
 744 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 745         {
 746                 .type           = PSMOUSE_SYNAPTICS,
 747                 .name           = "SynPS/2",
 748                 .alias          = "synaptics",
 749                 .detect         = synaptics_detect,
 750                 .init           = synaptics_init,
 751         },
 752         {
 753                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
 754                 .name           = "SynRelPS/2",
 755                 .alias          = "synaptics-relative",
 756                 .detect         = synaptics_detect,
 757                 .init           = synaptics_init_relative,
 758         },
 759 #endif
 760 #ifdef CONFIG_MOUSE_PS2_ALPS
 761         {
 762                 .type           = PSMOUSE_ALPS,
 763                 .name           = "AlpsPS/2",
 764                 .alias          = "alps",
 765                 .detect         = alps_detect,
 766                 .init           = alps_init,
 767         },
 768 #endif
 769 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 770         {
 771                 .type           = PSMOUSE_LIFEBOOK,
 772                 .name           = "LBPS/2",
 773                 .alias          = "lifebook",
 774                 .detect         = lifebook_detect,
 775                 .init           = lifebook_init,
 776         },
 777 #endif
 778 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 779         {
 780                 .type           = PSMOUSE_TRACKPOINT,
 781                 .name           = "TPPS/2",
 782                 .alias          = "trackpoint",
 783                 .detect         = trackpoint_detect,
 784                 .try_passthru   = true,
 785         },
 786 #endif
 787 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 788         {
 789                 .type           = PSMOUSE_TOUCHKIT_PS2,
 790                 .name           = "touchkitPS/2",
 791                 .alias          = "touchkit",
 792                 .detect         = touchkit_ps2_detect,
 793         },
 794 #endif
 795 #ifdef CONFIG_MOUSE_PS2_OLPC
 796         {
 797                 .type           = PSMOUSE_HGPK,
 798                 .name           = "OLPC HGPK",
 799                 .alias          = "hgpk",
 800                 .detect         = hgpk_detect,
 801         },
 802 #endif
 803 #ifdef CONFIG_MOUSE_PS2_ELANTECH
 804         {
 805                 .type           = PSMOUSE_ELANTECH,
 806                 .name           = "ETPS/2",
 807                 .alias          = "elantech",
 808                 .detect         = elantech_detect,
 809                 .init           = elantech_init,
 810         },
 811 #endif
 812 #ifdef CONFIG_MOUSE_PS2_SENTELIC
 813         {
 814                 .type           = PSMOUSE_FSP,
 815                 .name           = "FSPPS/2",
 816                 .alias          = "fsp",
 817                 .detect         = fsp_detect,
 818                 .init           = fsp_init,
 819         },
 820 #endif
 821         {
 822                 .type           = PSMOUSE_CORTRON,
 823                 .name           = "CortronPS/2",
 824                 .alias          = "cortps",
 825                 .detect         = cortron_detect,
 826         },
 827 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
 828         {
 829                 .type           = PSMOUSE_FOCALTECH,
 830                 .name           = "FocalTechPS/2",
 831                 .alias          = "focaltech",
 832                 .detect         = focaltech_detect,
 833                 .init           = focaltech_init,
 834         },
 835 #endif
 836 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
 837         {
 838                 .type           = PSMOUSE_VMMOUSE,
 839                 .name           = VMMOUSE_PSNAME,
 840                 .alias          = "vmmouse",
 841                 .detect         = vmmouse_detect,
 842                 .init           = vmmouse_init,
 843         },
 844 #endif
 845         {
 846                 .type           = PSMOUSE_AUTO,
 847                 .name           = "auto",
 848                 .alias          = "any",
 849                 .maxproto       = true,
 850         },
 851 };
 852
 853 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 854 {
 855         int i;
 856
 857         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 858                 if (psmouse_protocols[i].type == type)
 859                         return &psmouse_protocols[i];
 860
 861         return NULL;
 862 }
 863
 864 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 865 {
 866         const struct psmouse_protocol *proto;
 867
 868         proto = __psmouse_protocol_by_type(type);
 869         if (proto)
 870                 return proto;
 871
 872         WARN_ON(1);
 873         return &psmouse_protocols[0];
 874 }
 875
 876 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 877 {
 878         const struct psmouse_protocol *p;
 879         int i;
 880
 881         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 882                 p = &psmouse_protocols[i];
 883
 884                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 885                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 886                         return &psmouse_protocols[i];
 887         }
 888
 889         return NULL;
 890 }
 891
 892 /*
 893  * Apply default settings to the psmouse structure. Most of them will
 894  * be overridden by individual protocol initialization routines.
 895  */
 896 static void psmouse_apply_defaults(struct psmouse *psmouse)
 897 {
 898         struct input_dev *input_dev = psmouse->dev;
 899
 900         memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
 901         memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
 902         memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
 903         memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
 904         memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
 905
 906         __set_bit(EV_KEY, input_dev->evbit);
 907         __set_bit(EV_REL, input_dev->evbit);
 908
 909         __set_bit(BTN_LEFT, input_dev->keybit);
 910         __set_bit(BTN_RIGHT, input_dev->keybit);
 911
 912         __set_bit(REL_X, input_dev->relbit);
 913         __set_bit(REL_Y, input_dev->relbit);
 914
 915         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 916
 917         psmouse->set_rate = psmouse_set_rate;
 918         psmouse->set_resolution = psmouse_set_resolution;
 919         psmouse->set_scale = psmouse_set_scale;
 920         psmouse->poll = psmouse_poll;
 921         psmouse->protocol_handler = psmouse_process_byte;
 922         psmouse->pktsize = 3;
 923         psmouse->reconnect = NULL;
 924         psmouse->disconnect = NULL;
 925         psmouse->cleanup = NULL;
 926         psmouse->pt_activate = NULL;
 927         psmouse->pt_deactivate = NULL;
 928 }
 929
 930 static bool psmouse_try_protocol(struct psmouse *psmouse,
 931                                  enum psmouse_type type,
 932                                  unsigned int *max_proto,
 933                                  bool set_properties, bool init_allowed)
 934 {
 935         const struct psmouse_protocol *proto;
 936
 937         proto = __psmouse_protocol_by_type(type);
 938         if (!proto)
 939                 return false;
 940
 941         if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
 942             !proto->try_passthru) {
 943                 return false;
 944         }
 945
 946         if (set_properties)
 947                 psmouse_apply_defaults(psmouse);
 948
 949         if (proto->detect(psmouse, set_properties) != 0)
 950                 return false;
 951
 952         if (set_properties && proto->init && init_allowed) {
 953                 if (proto->init(psmouse) != 0) {
 954                         /*
 955                          * We detected device, but init failed. Adjust
 956                          * max_proto so we only try standard protocols.
 957                          */
 958                         if (*max_proto > PSMOUSE_IMEX)
 959                                 *max_proto = PSMOUSE_IMEX;
 960
 961                         return false;
 962                 }
 963         }
 964
 965         return true;
 966 }
 967
 968 /*
 969  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
 970  * the mouse may have.
 971  */
 972 static int psmouse_extensions(struct psmouse *psmouse,
 973                               unsigned int max_proto, bool set_properties)
 974 {
 975         bool synaptics_hardware = false;
 976
 977         /*
 978          * Always check for focaltech, this is safe as it uses pnp-id
 979          * matching.
 980          */
 981         if (psmouse_try_protocol(psmouse, PSMOUSE_FOCALTECH,
 982                                  &max_proto, set_properties, false)) {
 983                 if (max_proto > PSMOUSE_IMEX &&
 984                     IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
 985                     (!set_properties || focaltech_init(psmouse) == 0)) {
 986                         return PSMOUSE_FOCALTECH;
 987                 }
 988                 /*
 989                  * Restrict psmouse_max_proto so that psmouse_initialize()
 990                  * does not try to reset rate and resolution, because even
 991                  * that upsets the device.
 992                  * This also causes us to basically fall through to basic
 993                  * protocol detection, where we fully reset the mouse,
 994                  * and set it up as bare PS/2 protocol device.
 995                  */
 996                 psmouse_max_proto = max_proto = PSMOUSE_PS2;
 997         }
 998
 999         /*
1000          * We always check for LifeBook because it does not disturb mouse
1001          * (it only checks DMI information).
1002          */
1003         if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1004                                  set_properties, max_proto > PSMOUSE_IMEX))
1005                 return PSMOUSE_LIFEBOOK;
1006
1007         if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1008                                  set_properties, max_proto > PSMOUSE_IMEX))
1009                 return PSMOUSE_VMMOUSE;
1010
1011         /*
1012          * Try Kensington ThinkingMouse (we try first, because Synaptics
1013          * probe upsets the ThinkingMouse).
1014          */
1015         if (max_proto > PSMOUSE_IMEX &&
1016             psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1017                                  set_properties, true)) {
1018                 return PSMOUSE_THINKPS;
1019         }
1020
1021         /*
1022          * Try Synaptics TouchPad. Note that probing is done even if
1023          * Synaptics protocol support is disabled in config - we need to
1024          * know if it is Synaptics so we can reset it properly after
1025          * probing for IntelliMouse.
1026          */
1027         if (max_proto > PSMOUSE_PS2 &&
1028             psmouse_try_protocol(psmouse, PSMOUSE_SYNAPTICS, &max_proto,
1029                                  set_properties, false)) {
1030                 synaptics_hardware = true;
1031
1032                 if (max_proto > PSMOUSE_IMEX) {
1033                         /*
1034                          * Try activating protocol, but check if support is
1035                          * enabled first, since we try detecting Synaptics
1036                          * even when protocol is disabled.
1037                          */
1038                         if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) &&
1039                             (!set_properties || synaptics_init(psmouse) == 0)) {
1040                                 return PSMOUSE_SYNAPTICS;
1041                         }
1042
1043                         /*
1044                          * Some Synaptics touchpads can emulate extended
1045                          * protocols (like IMPS/2).  Unfortunately
1046                          * Logitech/Genius probes confuse some firmware
1047                          * versions so we'll have to skip them.
1048                          */
1049                         max_proto = PSMOUSE_IMEX;
1050                 }
1051
1052                 /*
1053                  * Make sure that touchpad is in relative mode, gestures
1054                  * (taps) are enabled.
1055                  */
1056                 synaptics_reset(psmouse);
1057         }
1058
1059         /*
1060          * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1061          * because Finger Sensing Pad probe upsets some modules of Cypress
1062          * Trackpads.
1063          */
1064         if (max_proto > PSMOUSE_IMEX &&
1065             psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1066                                  set_properties, true)) {
1067                 return PSMOUSE_CYPRESS;
1068         }
1069
1070         /* Try ALPS TouchPad */
1071         if (max_proto > PSMOUSE_IMEX) {
1072                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1073                 if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1074                                          &max_proto, set_properties, true))
1075                         return PSMOUSE_ALPS;
1076         }
1077
1078         /* Try OLPC HGPK touchpad */
1079         if (max_proto > PSMOUSE_IMEX &&
1080             psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1081                                  set_properties, true)) {
1082                 return PSMOUSE_HGPK;
1083         }
1084
1085         /* Try Elantech touchpad */
1086         if (max_proto > PSMOUSE_IMEX &&
1087             psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1088                                  &max_proto, set_properties, true)) {
1089                 return PSMOUSE_ELANTECH;
1090         }
1091
1092         if (max_proto > PSMOUSE_IMEX) {
1093                 if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1094                                          &max_proto, set_properties, true))
1095                         return PSMOUSE_GENPS;
1096
1097                 if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1098                                          &max_proto, set_properties, true))
1099                         return PSMOUSE_PS2PP;
1100
1101                 if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1102                                          &max_proto, set_properties, true))
1103                         return PSMOUSE_TRACKPOINT;
1104
1105                 if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1106                                          &max_proto, set_properties, true))
1107                         return PSMOUSE_TOUCHKIT_PS2;
1108         }
1109
1110         /*
1111          * Try Finger Sensing Pad. We do it here because its probe upsets
1112          * Trackpoint devices (causing TP_READ_ID command to time out).
1113          */
1114         if (max_proto > PSMOUSE_IMEX &&
1115             psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1116                                  &max_proto, set_properties, true)) {
1117                 return PSMOUSE_FSP;
1118         }
1119
1120         /*
1121          * Reset to defaults in case the device got confused by extended
1122          * protocol probes. Note that we follow up with full reset because
1123          * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1124          */
1125         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1126         psmouse_reset(psmouse);
1127
1128         if (max_proto >= PSMOUSE_IMEX &&
1129             psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1130                                  &max_proto, set_properties, true)) {
1131                 return PSMOUSE_IMEX;
1132         }
1133
1134         if (max_proto >= PSMOUSE_IMPS &&
1135             psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1136                                  &max_proto, set_properties, true)) {
1137                 return PSMOUSE_IMPS;
1138         }
1139
1140         /*
1141          * Okay, all failed, we have a standard mouse here. The number of
1142          * the buttons is still a question, though. We assume 3.
1143          */
1144         psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1145                              &max_proto, set_properties, true);
1146
1147         if (synaptics_hardware) {
1148                 /*
1149                  * We detected Synaptics hardware but it did not respond to
1150                  * IMPS/2 probes.  We need to reset the touchpad because if
1151                  * there is a track point on the pass through port it could
1152                  * get disabled while probing for protocol extensions.
1153                  */
1154                 psmouse_reset(psmouse);
1155         }
1156
1157         return PSMOUSE_PS2;
1158 }
1159
1160 /*
1161  * psmouse_probe() probes for a PS/2 mouse.
1162  */
1163 static int psmouse_probe(struct psmouse *psmouse)
1164 {
1165         struct ps2dev *ps2dev = &psmouse->ps2dev;
1166         unsigned char param[2];
1167
1168         /*
1169          * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1170          * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1171          * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1172          * subsequent ID queries, probably due to a firmware bug.
1173          */
1174         param[0] = 0xa5;
1175         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
1176                 return -1;
1177
1178         if (param[0] != 0x00 && param[0] != 0x03 &&
1179             param[0] != 0x04 && param[0] != 0xff)
1180                 return -1;
1181
1182         /*
1183          * Then we reset and disable the mouse so that it doesn't generate
1184          * events.
1185          */
1186         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
1187                 psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
1188                              ps2dev->serio->phys);
1189
1190         return 0;
1191 }
1192
1193 /*
1194  * psmouse_initialize() initializes the mouse to a sane state.
1195  */
1196 static void psmouse_initialize(struct psmouse *psmouse)
1197 {
1198         /*
1199          * We set the mouse report rate, resolution and scaling.
1200          */
1201         if (psmouse_max_proto != PSMOUSE_PS2) {
1202                 psmouse->set_rate(psmouse, psmouse->rate);
1203                 psmouse->set_resolution(psmouse, psmouse->resolution);
1204                 psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1205         }
1206 }
1207
1208 /*
1209  * psmouse_activate() enables the mouse so that we get motion reports from it.
1210  */
1211 int psmouse_activate(struct psmouse *psmouse)
1212 {
1213         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1214                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1215                              psmouse->ps2dev.serio->phys);
1216                 return -1;
1217         }
1218
1219         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1220         return 0;
1221 }
1222
1223 /*
1224  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1225  * motion reports from it unless we explicitly request it.
1226  */
1227 int psmouse_deactivate(struct psmouse *psmouse)
1228 {
1229         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
1230                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
1231                              psmouse->ps2dev.serio->phys);
1232                 return -1;
1233         }
1234
1235         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1236         return 0;
1237 }
1238
1239 /*
1240  * psmouse_resync() attempts to re-validate current protocol.
1241  */
1242 static void psmouse_resync(struct work_struct *work)
1243 {
1244         struct psmouse *parent = NULL, *psmouse =
1245                 container_of(work, struct psmouse, resync_work.work);
1246         struct serio *serio = psmouse->ps2dev.serio;
1247         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1248         bool failed = false, enabled = false;
1249         int i;
1250
1251         mutex_lock(&psmouse_mutex);
1252
1253         if (psmouse->state != PSMOUSE_RESYNCING)
1254                 goto out;
1255
1256         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1257                 parent = serio_get_drvdata(serio->parent);
1258                 psmouse_deactivate(parent);
1259         }
1260
1261         /*
1262          * Some mice don't ACK commands sent while they are in the middle of
1263          * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1264          * instead of ps2_command() which would wait for 200ms for an ACK
1265          * that may never come.
1266          * As an additional quirk ALPS touchpads may not only forget to ACK
1267          * disable command but will stop reporting taps, so if we see that
1268          * mouse at least once ACKs disable we will do full reconnect if ACK
1269          * is missing.
1270          */
1271         psmouse->num_resyncs++;
1272
1273         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1274                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1275                         failed = true;
1276         } else
1277                 psmouse->acks_disable_command = true;
1278
1279         /*
1280          * Poll the mouse. If it was reset the packet will be shorter than
1281          * psmouse->pktsize and ps2_command will fail. We do not expect and
1282          * do not handle scenario when mouse "upgrades" its protocol while
1283          * disconnected since it would require additional delay. If we ever
1284          * see a mouse that does it we'll adjust the code.
1285          */
1286         if (!failed) {
1287                 if (psmouse->poll(psmouse))
1288                         failed = true;
1289                 else {
1290                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1291                         for (i = 0; i < psmouse->pktsize; i++) {
1292                                 psmouse->pktcnt++;
1293                                 rc = psmouse->protocol_handler(psmouse);
1294                                 if (rc != PSMOUSE_GOOD_DATA)
1295                                         break;
1296                         }
1297                         if (rc != PSMOUSE_FULL_PACKET)
1298                                 failed = true;
1299                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1300                 }
1301         }
1302
1303         /*
1304          * Now try to enable mouse. We try to do that even if poll failed
1305          * and also repeat our attempts 5 times, otherwise we may be left
1306          * out with disabled mouse.
1307          */
1308         for (i = 0; i < 5; i++) {
1309                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1310                         enabled = true;
1311                         break;
1312                 }
1313                 msleep(200);
1314         }
1315
1316         if (!enabled) {
1317                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1318                              psmouse->ps2dev.serio->phys);
1319                 failed = true;
1320         }
1321
1322         if (failed) {
1323                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1324                 psmouse_info(psmouse,
1325                              "resync failed, issuing reconnect request\n");
1326                 serio_reconnect(serio);
1327         } else
1328                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1329
1330         if (parent)
1331                 psmouse_activate(parent);
1332  out:
1333         mutex_unlock(&psmouse_mutex);
1334 }
1335
1336 /*
1337  * psmouse_cleanup() resets the mouse into power-on state.
1338  */
1339 static void psmouse_cleanup(struct serio *serio)
1340 {
1341         struct psmouse *psmouse = serio_get_drvdata(serio);
1342         struct psmouse *parent = NULL;
1343
1344         mutex_lock(&psmouse_mutex);
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         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1352
1353         /*
1354          * Disable stream mode so cleanup routine can proceed undisturbed.
1355          */
1356         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1357                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1358                              psmouse->ps2dev.serio->phys);
1359
1360         if (psmouse->cleanup)
1361                 psmouse->cleanup(psmouse);
1362
1363         /*
1364          * Reset the mouse to defaults (bare PS/2 protocol).
1365          */
1366         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1367
1368         /*
1369          * Some boxes, such as HP nx7400, get terribly confused if mouse
1370          * is not fully enabled before suspending/shutting down.
1371          */
1372         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1373
1374         if (parent) {
1375                 if (parent->pt_deactivate)
1376                         parent->pt_deactivate(parent);
1377
1378                 psmouse_activate(parent);
1379         }
1380
1381         mutex_unlock(&psmouse_mutex);
1382 }
1383
1384 /*
1385  * psmouse_disconnect() closes and frees.
1386  */
1387 static void psmouse_disconnect(struct serio *serio)
1388 {
1389         struct psmouse *psmouse, *parent = NULL;
1390
1391         psmouse = serio_get_drvdata(serio);
1392
1393         sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1394
1395         mutex_lock(&psmouse_mutex);
1396
1397         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1398
1399         /* make sure we don't have a resync in progress */
1400         mutex_unlock(&psmouse_mutex);
1401         flush_workqueue(kpsmoused_wq);
1402         mutex_lock(&psmouse_mutex);
1403
1404         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1405                 parent = serio_get_drvdata(serio->parent);
1406                 psmouse_deactivate(parent);
1407         }
1408
1409         if (psmouse->disconnect)
1410                 psmouse->disconnect(psmouse);
1411
1412         if (parent && parent->pt_deactivate)
1413                 parent->pt_deactivate(parent);
1414
1415         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1416
1417         serio_close(serio);
1418         serio_set_drvdata(serio, NULL);
1419         input_unregister_device(psmouse->dev);
1420         kfree(psmouse);
1421
1422         if (parent)
1423                 psmouse_activate(parent);
1424
1425         mutex_unlock(&psmouse_mutex);
1426 }
1427
1428 static int psmouse_switch_protocol(struct psmouse *psmouse,
1429                                    const struct psmouse_protocol *proto)
1430 {
1431         const struct psmouse_protocol *selected_proto;
1432         struct input_dev *input_dev = psmouse->dev;
1433
1434         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1435
1436         if (proto && (proto->detect || proto->init)) {
1437                 psmouse_apply_defaults(psmouse);
1438
1439                 if (proto->detect && proto->detect(psmouse, true) < 0)
1440                         return -1;
1441
1442                 if (proto->init && proto->init(psmouse) < 0)
1443                         return -1;
1444
1445                 psmouse->type = proto->type;
1446                 selected_proto = proto;
1447         } else {
1448                 psmouse->type = psmouse_extensions(psmouse,
1449                                                    psmouse_max_proto, true);
1450                 selected_proto = psmouse_protocol_by_type(psmouse->type);
1451         }
1452
1453         psmouse->ignore_parity = selected_proto->ignore_parity;
1454
1455         /*
1456          * If mouse's packet size is 3 there is no point in polling the
1457          * device in hopes to detect protocol reset - we won't get less
1458          * than 3 bytes response anyhow.
1459          */
1460         if (psmouse->pktsize == 3)
1461                 psmouse->resync_time = 0;
1462
1463         /*
1464          * Some smart KVMs fake response to POLL command returning just
1465          * 3 bytes and messing up our resync logic, so if initial poll
1466          * fails we won't try polling the device anymore. Hopefully
1467          * such KVM will maintain initially selected protocol.
1468          */
1469         if (psmouse->resync_time && psmouse->poll(psmouse))
1470                 psmouse->resync_time = 0;
1471
1472         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1473                  selected_proto->name, psmouse->vendor, psmouse->name);
1474
1475         input_dev->name = psmouse->devname;
1476         input_dev->phys = psmouse->phys;
1477         input_dev->id.bustype = BUS_I8042;
1478         input_dev->id.vendor = 0x0002;
1479         input_dev->id.product = psmouse->type;
1480         input_dev->id.version = psmouse->model;
1481
1482         return 0;
1483 }
1484
1485 /*
1486  * psmouse_connect() is a callback from the serio module when
1487  * an unhandled serio port is found.
1488  */
1489 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1490 {
1491         struct psmouse *psmouse, *parent = NULL;
1492         struct input_dev *input_dev;
1493         int retval = 0, error = -ENOMEM;
1494
1495         mutex_lock(&psmouse_mutex);
1496
1497         /*
1498          * If this is a pass-through port deactivate parent so the device
1499          * connected to this port can be successfully identified
1500          */
1501         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1502                 parent = serio_get_drvdata(serio->parent);
1503                 psmouse_deactivate(parent);
1504         }
1505
1506         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1507         input_dev = input_allocate_device();
1508         if (!psmouse || !input_dev)
1509                 goto err_free;
1510
1511         ps2_init(&psmouse->ps2dev, serio);
1512         INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1513         psmouse->dev = input_dev;
1514         snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1515
1516         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1517
1518         serio_set_drvdata(serio, psmouse);
1519
1520         error = serio_open(serio, drv);
1521         if (error)
1522                 goto err_clear_drvdata;
1523
1524         /* give PT device some time to settle down before probing */
1525         if (serio->id.type == SERIO_PS_PSTHRU)
1526                 usleep_range(10000, 15000);
1527
1528         if (psmouse_probe(psmouse) < 0) {
1529                 error = -ENODEV;
1530                 goto err_close_serio;
1531         }
1532
1533         psmouse->rate = psmouse_rate;
1534         psmouse->resolution = psmouse_resolution;
1535         psmouse->resetafter = psmouse_resetafter;
1536         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1537         psmouse->smartscroll = psmouse_smartscroll;
1538
1539         psmouse_switch_protocol(psmouse, NULL);
1540
1541         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1542         psmouse_initialize(psmouse);
1543
1544         error = input_register_device(psmouse->dev);
1545         if (error)
1546                 goto err_protocol_disconnect;
1547
1548         if (parent && parent->pt_activate)
1549                 parent->pt_activate(parent);
1550
1551         error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1552         if (error)
1553                 goto err_pt_deactivate;
1554
1555         psmouse_activate(psmouse);
1556
1557  out:
1558         /* If this is a pass-through port the parent needs to be re-activated */
1559         if (parent)
1560                 psmouse_activate(parent);
1561
1562         mutex_unlock(&psmouse_mutex);
1563         return retval;
1564
1565  err_pt_deactivate:
1566         if (parent && parent->pt_deactivate)
1567                 parent->pt_deactivate(parent);
1568         input_unregister_device(psmouse->dev);
1569         input_dev = NULL; /* so we don't try to free it below */
1570  err_protocol_disconnect:
1571         if (psmouse->disconnect)
1572                 psmouse->disconnect(psmouse);
1573         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1574  err_close_serio:
1575         serio_close(serio);
1576  err_clear_drvdata:
1577         serio_set_drvdata(serio, NULL);
1578  err_free:
1579         input_free_device(input_dev);
1580         kfree(psmouse);
1581
1582         retval = error;
1583         goto out;
1584 }
1585
1586 static int psmouse_reconnect(struct serio *serio)
1587 {
1588         struct psmouse *psmouse = serio_get_drvdata(serio);
1589         struct psmouse *parent = NULL;
1590         unsigned char type;
1591         int rc = -1;
1592
1593         mutex_lock(&psmouse_mutex);
1594
1595         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1596                 parent = serio_get_drvdata(serio->parent);
1597                 psmouse_deactivate(parent);
1598         }
1599
1600         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1601
1602         if (psmouse->reconnect) {
1603                 if (psmouse->reconnect(psmouse))
1604                         goto out;
1605         } else {
1606                 psmouse_reset(psmouse);
1607
1608                 if (psmouse_probe(psmouse) < 0)
1609                         goto out;
1610
1611                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1612                 if (psmouse->type != type)
1613                         goto out;
1614         }
1615
1616         /*
1617          * OK, the device type (and capabilities) match the old one,
1618          * we can continue using it, complete initialization
1619          */
1620         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1621
1622         psmouse_initialize(psmouse);
1623
1624         if (parent && parent->pt_activate)
1625                 parent->pt_activate(parent);
1626
1627         psmouse_activate(psmouse);
1628         rc = 0;
1629
1630 out:
1631         /* If this is a pass-through port the parent waits to be activated */
1632         if (parent)
1633                 psmouse_activate(parent);
1634
1635         mutex_unlock(&psmouse_mutex);
1636         return rc;
1637 }
1638
1639 static struct serio_device_id psmouse_serio_ids[] = {
1640         {
1641                 .type   = SERIO_8042,
1642                 .proto  = SERIO_ANY,
1643                 .id     = SERIO_ANY,
1644                 .extra  = SERIO_ANY,
1645         },
1646         {
1647                 .type   = SERIO_PS_PSTHRU,
1648                 .proto  = SERIO_ANY,
1649                 .id     = SERIO_ANY,
1650                 .extra  = SERIO_ANY,
1651         },
1652         { 0 }
1653 };
1654
1655 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1656
1657 static struct serio_driver psmouse_drv = {
1658         .driver         = {
1659                 .name   = "psmouse",
1660         },
1661         .description    = DRIVER_DESC,
1662         .id_table       = psmouse_serio_ids,
1663         .interrupt      = psmouse_interrupt,
1664         .connect        = psmouse_connect,
1665         .reconnect      = psmouse_reconnect,
1666         .disconnect     = psmouse_disconnect,
1667         .cleanup        = psmouse_cleanup,
1668 };
1669
1670 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1671                                  char *buf)
1672 {
1673         struct serio *serio = to_serio_port(dev);
1674         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1675         struct psmouse *psmouse;
1676
1677         psmouse = serio_get_drvdata(serio);
1678
1679         return attr->show(psmouse, attr->data, buf);
1680 }
1681
1682 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1683                                 const char *buf, size_t count)
1684 {
1685         struct serio *serio = to_serio_port(dev);
1686         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1687         struct psmouse *psmouse, *parent = NULL;
1688         int retval;
1689
1690         retval = mutex_lock_interruptible(&psmouse_mutex);
1691         if (retval)
1692                 goto out;
1693
1694         psmouse = serio_get_drvdata(serio);
1695
1696         if (attr->protect) {
1697                 if (psmouse->state == PSMOUSE_IGNORE) {
1698                         retval = -ENODEV;
1699                         goto out_unlock;
1700                 }
1701
1702                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1703                         parent = serio_get_drvdata(serio->parent);
1704                         psmouse_deactivate(parent);
1705                 }
1706
1707                 psmouse_deactivate(psmouse);
1708         }
1709
1710         retval = attr->set(psmouse, attr->data, buf, count);
1711
1712         if (attr->protect) {
1713                 if (retval != -ENODEV)
1714                         psmouse_activate(psmouse);
1715
1716                 if (parent)
1717                         psmouse_activate(parent);
1718         }
1719
1720  out_unlock:
1721         mutex_unlock(&psmouse_mutex);
1722  out:
1723         return retval;
1724 }
1725
1726 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1727 {
1728         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1729
1730         return sprintf(buf, "%u\n", *field);
1731 }
1732
1733 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1734 {
1735         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1736         unsigned int value;
1737         int err;
1738
1739         err = kstrtouint(buf, 10, &value);
1740         if (err)
1741                 return err;
1742
1743         *field = value;
1744
1745         return count;
1746 }
1747
1748 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1749 {
1750         return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
1751 }
1752
1753 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1754 {
1755         struct serio *serio = psmouse->ps2dev.serio;
1756         struct psmouse *parent = NULL;
1757         struct input_dev *old_dev, *new_dev;
1758         const struct psmouse_protocol *proto, *old_proto;
1759         int error;
1760         int retry = 0;
1761
1762         proto = psmouse_protocol_by_name(buf, count);
1763         if (!proto)
1764                 return -EINVAL;
1765
1766         if (psmouse->type == proto->type)
1767                 return count;
1768
1769         new_dev = input_allocate_device();
1770         if (!new_dev)
1771                 return -ENOMEM;
1772
1773         while (!list_empty(&serio->children)) {
1774                 if (++retry > 3) {
1775                         psmouse_warn(psmouse,
1776                                      "failed to destroy children ports, protocol change aborted.\n");
1777                         input_free_device(new_dev);
1778                         return -EIO;
1779                 }
1780
1781                 mutex_unlock(&psmouse_mutex);
1782                 serio_unregister_child_port(serio);
1783                 mutex_lock(&psmouse_mutex);
1784
1785                 if (serio->drv != &psmouse_drv) {
1786                         input_free_device(new_dev);
1787                         return -ENODEV;
1788                 }
1789
1790                 if (psmouse->type == proto->type) {
1791                         input_free_device(new_dev);
1792                         return count; /* switched by other thread */
1793                 }
1794         }
1795
1796         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1797                 parent = serio_get_drvdata(serio->parent);
1798                 if (parent->pt_deactivate)
1799                         parent->pt_deactivate(parent);
1800         }
1801
1802         old_dev = psmouse->dev;
1803         old_proto = psmouse_protocol_by_type(psmouse->type);
1804
1805         if (psmouse->disconnect)
1806                 psmouse->disconnect(psmouse);
1807
1808         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1809
1810         psmouse->dev = new_dev;
1811         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1812
1813         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1814                 psmouse_reset(psmouse);
1815                 /* default to PSMOUSE_PS2 */
1816                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1817         }
1818
1819         psmouse_initialize(psmouse);
1820         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1821
1822         error = input_register_device(psmouse->dev);
1823         if (error) {
1824                 if (psmouse->disconnect)
1825                         psmouse->disconnect(psmouse);
1826
1827                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1828                 input_free_device(new_dev);
1829                 psmouse->dev = old_dev;
1830                 psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1831                 psmouse_switch_protocol(psmouse, old_proto);
1832                 psmouse_initialize(psmouse);
1833                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1834
1835                 return error;
1836         }
1837
1838         input_unregister_device(old_dev);
1839
1840         if (parent && parent->pt_activate)
1841                 parent->pt_activate(parent);
1842
1843         return count;
1844 }
1845
1846 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1847 {
1848         unsigned int value;
1849         int err;
1850
1851         err = kstrtouint(buf, 10, &value);
1852         if (err)
1853                 return err;
1854
1855         psmouse->set_rate(psmouse, value);
1856         return count;
1857 }
1858
1859 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1860 {
1861         unsigned int value;
1862         int err;
1863
1864         err = kstrtouint(buf, 10, &value);
1865         if (err)
1866                 return err;
1867
1868         psmouse->set_resolution(psmouse, value);
1869         return count;
1870 }
1871
1872
1873 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
1874 {
1875         const struct psmouse_protocol *proto;
1876
1877         if (!val)
1878                 return -EINVAL;
1879
1880         proto = psmouse_protocol_by_name(val, strlen(val));
1881
1882         if (!proto || !proto->maxproto)
1883                 return -EINVAL;
1884
1885         *((unsigned int *)kp->arg) = proto->type;
1886
1887         return 0;
1888 }
1889
1890 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
1891 {
1892         int type = *((unsigned int *)kp->arg);
1893
1894         return sprintf(buffer, "%s", psmouse_protocol_by_type(type)->name);
1895 }
1896
1897 static int __init psmouse_init(void)
1898 {
1899         int err;
1900
1901         lifebook_module_init();
1902         synaptics_module_init();
1903         hgpk_module_init();
1904
1905         kpsmoused_wq = create_singlethread_workqueue("kpsmoused");
1906         if (!kpsmoused_wq) {
1907                 pr_err("failed to create kpsmoused workqueue\n");
1908                 return -ENOMEM;
1909         }
1910
1911         err = serio_register_driver(&psmouse_drv);
1912         if (err)
1913                 destroy_workqueue(kpsmoused_wq);
1914
1915         return err;
1916 }
1917
1918 static void __exit psmouse_exit(void)
1919 {
1920         serio_unregister_driver(&psmouse_drv);
1921         destroy_workqueue(kpsmoused_wq);
1922 }
1923
1924 module_init(psmouse_init);
1925 module_exit(psmouse_exit);