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