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 static void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
 120 {
 121         input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
 122         input_report_key(dev, BTN_MIDDLE, buttons & BIT(2));
 123         input_report_key(dev, BTN_RIGHT,  buttons & BIT(1));
 124 }
 125
 126 /*
 127  * psmouse_process_byte() analyzes the PS/2 data stream and reports
 128  * relevant events to the input module once full packet has arrived.
 129  */
 130 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 131 {
 132         struct input_dev *dev = psmouse->dev;
 133         unsigned char *packet = psmouse->packet;
 134
 135         if (psmouse->pktcnt < psmouse->pktsize)
 136                 return PSMOUSE_GOOD_DATA;
 137
 138         /* Full packet accumulated, process it */
 139
 140         switch (psmouse->protocol->type) {
 141         case PSMOUSE_IMPS:
 142                 /* IntelliMouse has scroll wheel */
 143                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 144                 break;
 145
 146         case PSMOUSE_IMEX:
 147                 /* Scroll wheel and buttons on IntelliMouse Explorer */
 148                 switch (packet[3] & 0xC0) {
 149                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 150                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 151                         break;
 152                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 153                         input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 154                         break;
 155                 case 0x00:
 156                 case 0xC0:
 157                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
 158                         input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
 159                         input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
 160                         break;
 161                 }
 162                 break;
 163
 164         case PSMOUSE_GENPS:
 165                 /* Report scroll buttons on NetMice */
 166                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 167
 168                 /* Extra buttons on Genius NewNet 3D */
 169                 input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
 170                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
 171                 break;
 172
 173         case PSMOUSE_THINKPS:
 174                 /* Extra button on ThinkingMouse */
 175                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
 176
 177                 /*
 178                  * Without this bit of weirdness moving up gives wildly
 179                  * high Y changes.
 180                  */
 181                 packet[1] |= (packet[0] & 0x40) << 1;
 182                 break;
 183
 184         case PSMOUSE_CORTRON:
 185                 /*
 186                  * Cortron PS2 Trackball reports SIDE button in the
 187                  * 4th bit of the first byte.
 188                  */
 189                 input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
 190                 packet[0] |= 0x08;
 191                 break;
 192
 193         default:
 194                 break;
 195         }
 196
 197         /* Generic PS/2 Mouse */
 198         psmouse_report_standard_buttons(dev,
 199                                         packet[0] | psmouse->extra_buttons);
 200
 201         input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
 202         input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
 203
 204         input_sync(dev);
 205
 206         return PSMOUSE_FULL_PACKET;
 207 }
 208
 209 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 210                 unsigned long delay)
 211 {
 212         queue_delayed_work(kpsmoused_wq, work, delay);
 213 }
 214
 215 /*
 216  * __psmouse_set_state() sets new psmouse state and resets all flags.
 217  */
 218 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 219 {
 220         psmouse->state = new_state;
 221         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 222         psmouse->ps2dev.flags = 0;
 223         psmouse->last = jiffies;
 224 }
 225
 226 /*
 227  * psmouse_set_state() sets new psmouse state and resets all flags and
 228  * counters while holding serio lock so fighting with interrupt handler
 229  * is not a concern.
 230  */
 231 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 232 {
 233         serio_pause_rx(psmouse->ps2dev.serio);
 234         __psmouse_set_state(psmouse, new_state);
 235         serio_continue_rx(psmouse->ps2dev.serio);
 236 }
 237
 238 /*
 239  * psmouse_handle_byte() processes one byte of the input data stream
 240  * by calling corresponding protocol handler.
 241  */
 242 static int psmouse_handle_byte(struct psmouse *psmouse)
 243 {
 244         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 245
 246         switch (rc) {
 247         case PSMOUSE_BAD_DATA:
 248                 if (psmouse->state == PSMOUSE_ACTIVATED) {
 249                         psmouse_warn(psmouse,
 250                                      "%s at %s lost sync at byte %d\n",
 251                                      psmouse->name, psmouse->phys,
 252                                      psmouse->pktcnt);
 253                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 254                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 255                                 psmouse_notice(psmouse,
 256                                                 "issuing reconnect request\n");
 257                                 serio_reconnect(psmouse->ps2dev.serio);
 258                                 return -1;
 259                         }
 260                 }
 261                 psmouse->pktcnt = 0;
 262                 break;
 263
 264         case PSMOUSE_FULL_PACKET:
 265                 psmouse->pktcnt = 0;
 266                 if (psmouse->out_of_sync_cnt) {
 267                         psmouse->out_of_sync_cnt = 0;
 268                         psmouse_notice(psmouse,
 269                                         "%s at %s - driver resynced.\n",
 270                                         psmouse->name, psmouse->phys);
 271                 }
 272                 break;
 273
 274         case PSMOUSE_GOOD_DATA:
 275                 break;
 276         }
 277         return 0;
 278 }
 279
 280 static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
 281 {
 282         switch (psmouse->oob_data_type) {
 283         case PSMOUSE_OOB_NONE:
 284                 psmouse->oob_data_type = data;
 285                 break;
 286
 287         case PSMOUSE_OOB_EXTRA_BTNS:
 288                 psmouse_report_standard_buttons(psmouse->dev, data);
 289                 input_sync(psmouse->dev);
 290
 291                 psmouse->extra_buttons = data;
 292                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 293                 break;
 294
 295         default:
 296                 psmouse_warn(psmouse,
 297                              "unknown OOB_DATA type: 0x%02x\n",
 298                              psmouse->oob_data_type);
 299                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 300                 break;
 301         }
 302 }
 303
 304 /*
 305  * psmouse_interrupt() handles incoming characters, either passing them
 306  * for normal processing or gathering them as command response.
 307  */
 308 static irqreturn_t psmouse_interrupt(struct serio *serio,
 309                 unsigned char data, unsigned int flags)
 310 {
 311         struct psmouse *psmouse = serio_get_drvdata(serio);
 312
 313         if (psmouse->state == PSMOUSE_IGNORE)
 314                 goto out;
 315
 316         if (unlikely((flags & SERIO_TIMEOUT) ||
 317                      ((flags & SERIO_PARITY) &&
 318                       !psmouse->protocol->ignore_parity))) {
 319
 320                 if (psmouse->state == PSMOUSE_ACTIVATED)
 321                         psmouse_warn(psmouse,
 322                                      "bad data from KBC -%s%s\n",
 323                                      flags & SERIO_TIMEOUT ? " timeout" : "",
 324                                      flags & SERIO_PARITY ? " bad parity" : "");
 325                 ps2_cmd_aborted(&psmouse->ps2dev);
 326                 goto out;
 327         }
 328
 329         if (flags & SERIO_OOB_DATA) {
 330                 psmouse_handle_oob_data(psmouse, data);
 331                 goto out;
 332         }
 333
 334         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
 335                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
 336                         goto out;
 337
 338         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
 339                 if  (ps2_handle_response(&psmouse->ps2dev, data))
 340                         goto out;
 341
 342         if (psmouse->state <= PSMOUSE_RESYNCING)
 343                 goto out;
 344
 345         if (psmouse->state == PSMOUSE_ACTIVATED &&
 346             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 347                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 348                              psmouse->name, psmouse->phys, psmouse->pktcnt);
 349                 psmouse->badbyte = psmouse->packet[0];
 350                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 351                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 352                 goto out;
 353         }
 354
 355         psmouse->packet[psmouse->pktcnt++] = data;
 356
 357         /* Check if this is a new device announcement (0xAA 0x00) */
 358         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 359                 if (psmouse->pktcnt == 1) {
 360                         psmouse->last = jiffies;
 361                         goto out;
 362                 }
 363
 364                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 365                     (psmouse->protocol->type == PSMOUSE_HGPK &&
 366                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 367                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 368                         serio_reconnect(serio);
 369                         goto out;
 370                 }
 371
 372                 /* Not a new device, try processing first byte normally */
 373                 psmouse->pktcnt = 1;
 374                 if (psmouse_handle_byte(psmouse))
 375                         goto out;
 376
 377                 psmouse->packet[psmouse->pktcnt++] = data;
 378         }
 379
 380         /*
 381          * See if we need to force resync because mouse was idle for
 382          * too long.
 383          */
 384         if (psmouse->state == PSMOUSE_ACTIVATED &&
 385             psmouse->pktcnt == 1 && psmouse->resync_time &&
 386             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 387                 psmouse->badbyte = psmouse->packet[0];
 388                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 389                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 390                 goto out;
 391         }
 392
 393         psmouse->last = jiffies;
 394         psmouse_handle_byte(psmouse);
 395
 396  out:
 397         return IRQ_HANDLED;
 398 }
 399
 400 /*
 401  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
 402  * using sliced syntax, understood by advanced devices, such as Logitech
 403  * or Synaptics touchpads. The command is encoded as:
 404  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
 405  * is the command.
 406  */
 407 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
 408 {
 409         int i;
 410
 411         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
 412                 return -1;
 413
 414         for (i = 6; i >= 0; i -= 2) {
 415                 unsigned char d = (command >> i) & 3;
 416                 if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
 417                         return -1;
 418         }
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * psmouse_reset() resets the mouse into power-on state.
 425  */
 426 int psmouse_reset(struct psmouse *psmouse)
 427 {
 428         unsigned char param[2];
 429
 430         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
 431                 return -1;
 432
 433         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 434                 return -1;
 435
 436         return 0;
 437 }
 438
 439 /*
 440  * Here we set the mouse resolution.
 441  */
 442 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 443 {
 444         static const unsigned char params[] = { 0, 1, 2, 2, 3 };
 445         unsigned char p;
 446
 447         if (resolution == 0 || resolution > 200)
 448                 resolution = 200;
 449
 450         p = params[resolution / 50];
 451         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 452         psmouse->resolution = 25 << p;
 453 }
 454
 455 /*
 456  * Here we set the mouse report rate.
 457  */
 458 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 459 {
 460         static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 461         unsigned char r;
 462         int i = 0;
 463
 464         while (rates[i] > rate) i++;
 465         r = rates[i];
 466         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 467         psmouse->rate = r;
 468 }
 469
 470 /*
 471  * Here we set the mouse scaling.
 472  */
 473 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 474 {
 475         ps2_command(&psmouse->ps2dev, NULL,
 476                     scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 477                                                PSMOUSE_CMD_SETSCALE11);
 478 }
 479
 480 /*
 481  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 482  */
 483 static int psmouse_poll(struct psmouse *psmouse)
 484 {
 485         return ps2_command(&psmouse->ps2dev, psmouse->packet,
 486                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 487 }
 488
 489 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 490 {
 491         int i;
 492
 493         for (i = 0; ids[i]; i++)
 494                 if (!strcasecmp(id, ids[i]))
 495                         return true;
 496
 497         return false;
 498 }
 499
 500 /*
 501  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 502  */
 503 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 504 {
 505         struct serio *serio = psmouse->ps2dev.serio;
 506         char *p, *fw_id_copy, *save_ptr;
 507         bool found = false;
 508
 509         if (strncmp(serio->firmware_id, "PNP: ", 5))
 510                 return false;
 511
 512         fw_id_copy = kstrndup(&serio->firmware_id[5],
 513                               sizeof(serio->firmware_id) - 5,
 514                               GFP_KERNEL);
 515         if (!fw_id_copy)
 516                 return false;
 517
 518         save_ptr = fw_id_copy;
 519         while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 520                 if (psmouse_check_pnp_id(p, ids)) {
 521                         found = true;
 522                         break;
 523                 }
 524         }
 525
 526         kfree(save_ptr);
 527         return found;
 528 }
 529
 530 /*
 531  * Genius NetMouse magic init.
 532  */
 533 static int genius_detect(struct psmouse *psmouse, bool set_properties)
 534 {
 535         struct ps2dev *ps2dev = &psmouse->ps2dev;
 536         unsigned char param[4];
 537
 538         param[0] = 3;
 539         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 540         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 541         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 542         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 543         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 544
 545         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 546                 return -1;
 547
 548         if (set_properties) {
 549                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 550                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 551                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 552                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 553
 554                 psmouse->vendor = "Genius";
 555                 psmouse->name = "Mouse";
 556                 psmouse->pktsize = 4;
 557         }
 558
 559         return 0;
 560 }
 561
 562 /*
 563  * IntelliMouse magic init.
 564  */
 565 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 566 {
 567         struct ps2dev *ps2dev = &psmouse->ps2dev;
 568         unsigned char param[2];
 569
 570         param[0] = 200;
 571         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 572         param[0] = 100;
 573         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 574         param[0] =  80;
 575         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 576         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 577
 578         if (param[0] != 3)
 579                 return -1;
 580
 581         if (set_properties) {
 582                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 583                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 584
 585                 if (!psmouse->vendor)
 586                         psmouse->vendor = "Generic";
 587                 if (!psmouse->name)
 588                         psmouse->name = "Wheel Mouse";
 589                 psmouse->pktsize = 4;
 590         }
 591
 592         return 0;
 593 }
 594
 595 /*
 596  * Try IntelliMouse/Explorer magic init.
 597  */
 598 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 599 {
 600         struct ps2dev *ps2dev = &psmouse->ps2dev;
 601         unsigned char param[2];
 602
 603         intellimouse_detect(psmouse, 0);
 604
 605         param[0] = 200;
 606         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 607         param[0] = 200;
 608         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 609         param[0] =  80;
 610         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 611         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 612
 613         if (param[0] != 4)
 614                 return -1;
 615
 616         /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 617         param[0] = 200;
 618         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 619         param[0] =  80;
 620         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 621         param[0] =  40;
 622         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 623
 624         if (set_properties) {
 625                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 626                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 627                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
 628                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 629                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 630
 631                 if (!psmouse->vendor)
 632                         psmouse->vendor = "Generic";
 633                 if (!psmouse->name)
 634                         psmouse->name = "Explorer Mouse";
 635                 psmouse->pktsize = 4;
 636         }
 637
 638         return 0;
 639 }
 640
 641 /*
 642  * Kensington ThinkingMouse / ExpertMouse magic init.
 643  */
 644 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 645 {
 646         struct ps2dev *ps2dev = &psmouse->ps2dev;
 647         unsigned char param[2];
 648         static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 649         int i;
 650
 651         param[0] = 10;
 652         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 653         param[0] = 0;
 654         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 655         for (i = 0; i < ARRAY_SIZE(seq); i++) {
 656                 param[0] = seq[i];
 657                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 658         }
 659         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 660
 661         if (param[0] != 2)
 662                 return -1;
 663
 664         if (set_properties) {
 665                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 666                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 667
 668                 psmouse->vendor = "Kensington";
 669                 psmouse->name = "ThinkingMouse";
 670         }
 671
 672         return 0;
 673 }
 674
 675 /*
 676  * Bare PS/2 protocol "detection". Always succeeds.
 677  */
 678 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 679 {
 680         if (set_properties) {
 681                 if (!psmouse->vendor)
 682                         psmouse->vendor = "Generic";
 683                 if (!psmouse->name)
 684                         psmouse->name = "Mouse";
 685
 686                 /*
 687                  * We have no way of figuring true number of buttons so let's
 688                  * assume that the device has 3.
 689                  */
 690                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 691         }
 692
 693         return 0;
 694 }
 695
 696 /*
 697  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 698  * must be forced by sysfs protocol writing.
 699  */
 700 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 701 {
 702         if (set_properties) {
 703                 psmouse->vendor = "Cortron";
 704                 psmouse->name = "PS/2 Trackball";
 705
 706                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 707                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 708         }
 709
 710         return 0;
 711 }
 712
 713 static const struct psmouse_protocol psmouse_protocols[] = {
 714         {
 715                 .type           = PSMOUSE_PS2,
 716                 .name           = "PS/2",
 717                 .alias          = "bare",
 718                 .maxproto       = true,
 719                 .ignore_parity  = true,
 720                 .detect         = ps2bare_detect,
 721                 .try_passthru   = true,
 722         },
 723 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 724         {
 725                 .type           = PSMOUSE_PS2PP,
 726                 .name           = "PS2++",
 727                 .alias          = "logitech",
 728                 .detect         = ps2pp_detect,
 729         },
 730 #endif
 731         {
 732                 .type           = PSMOUSE_THINKPS,
 733                 .name           = "ThinkPS/2",
 734                 .alias          = "thinkps",
 735                 .detect         = thinking_detect,
 736         },
 737 #ifdef CONFIG_MOUSE_PS2_CYPRESS
 738         {
 739                 .type           = PSMOUSE_CYPRESS,
 740                 .name           = "CyPS/2",
 741                 .alias          = "cypress",
 742                 .detect         = cypress_detect,
 743                 .init           = cypress_init,
 744         },
 745 #endif
 746         {
 747                 .type           = PSMOUSE_GENPS,
 748                 .name           = "GenPS/2",
 749                 .alias          = "genius",
 750                 .detect         = genius_detect,
 751         },
 752         {
 753                 .type           = PSMOUSE_IMPS,
 754                 .name           = "ImPS/2",
 755                 .alias          = "imps",
 756                 .maxproto       = true,
 757                 .ignore_parity  = true,
 758                 .detect         = intellimouse_detect,
 759                 .try_passthru   = true,
 760         },
 761         {
 762                 .type           = PSMOUSE_IMEX,
 763                 .name           = "ImExPS/2",
 764                 .alias          = "exps",
 765                 .maxproto       = true,
 766                 .ignore_parity  = true,
 767                 .detect         = im_explorer_detect,
 768                 .try_passthru   = true,
 769         },
 770 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 771         {
 772                 .type           = PSMOUSE_SYNAPTICS,
 773                 .name           = "SynPS/2",
 774                 .alias          = "synaptics",
 775                 .detect         = synaptics_detect,
 776                 .init           = synaptics_init_absolute,
 777         },
 778         {
 779                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
 780                 .name           = "SynRelPS/2",
 781                 .alias          = "synaptics-relative",
 782                 .detect         = synaptics_detect,
 783                 .init           = synaptics_init_relative,
 784         },
 785 #endif
 786 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
 787         {
 788                 .type           = PSMOUSE_SYNAPTICS_SMBUS,
 789                 .name           = "SynSMBus",
 790                 .alias          = "synaptics-smbus",
 791                 .detect         = synaptics_detect,
 792                 .init           = synaptics_init_smbus,
 793                 .smbus_companion = true,
 794         },
 795 #endif
 796 #ifdef CONFIG_MOUSE_PS2_ALPS
 797         {
 798                 .type           = PSMOUSE_ALPS,
 799                 .name           = "AlpsPS/2",
 800                 .alias          = "alps",
 801                 .detect         = alps_detect,
 802                 .init           = alps_init,
 803         },
 804 #endif
 805 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 806         {
 807                 .type           = PSMOUSE_LIFEBOOK,
 808                 .name           = "LBPS/2",
 809                 .alias          = "lifebook",
 810                 .detect         = lifebook_detect,
 811                 .init           = lifebook_init,
 812         },
 813 #endif
 814 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 815         {
 816                 .type           = PSMOUSE_TRACKPOINT,
 817                 .name           = "TPPS/2",
 818                 .alias          = "trackpoint",
 819                 .detect         = trackpoint_detect,
 820                 .try_passthru   = true,
 821         },
 822 #endif
 823 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 824         {
 825                 .type           = PSMOUSE_TOUCHKIT_PS2,
 826                 .name           = "touchkitPS/2",
 827                 .alias          = "touchkit",
 828                 .detect         = touchkit_ps2_detect,
 829         },
 830 #endif
 831 #ifdef CONFIG_MOUSE_PS2_OLPC
 832         {
 833                 .type           = PSMOUSE_HGPK,
 834                 .name           = "OLPC HGPK",
 835                 .alias          = "hgpk",
 836                 .detect         = hgpk_detect,
 837         },
 838 #endif
 839 #ifdef CONFIG_MOUSE_PS2_ELANTECH
 840         {
 841                 .type           = PSMOUSE_ELANTECH,
 842                 .name           = "ETPS/2",
 843                 .alias          = "elantech",
 844                 .detect         = elantech_detect,
 845                 .init           = elantech_init,
 846         },
 847 #endif
 848 #ifdef CONFIG_MOUSE_PS2_SENTELIC
 849         {
 850                 .type           = PSMOUSE_FSP,
 851                 .name           = "FSPPS/2",
 852                 .alias          = "fsp",
 853                 .detect         = fsp_detect,
 854                 .init           = fsp_init,
 855         },
 856 #endif
 857         {
 858                 .type           = PSMOUSE_CORTRON,
 859                 .name           = "CortronPS/2",
 860                 .alias          = "cortps",
 861                 .detect         = cortron_detect,
 862         },
 863 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
 864         {
 865                 .type           = PSMOUSE_FOCALTECH,
 866                 .name           = "FocalTechPS/2",
 867                 .alias          = "focaltech",
 868                 .detect         = focaltech_detect,
 869                 .init           = focaltech_init,
 870         },
 871 #endif
 872 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
 873         {
 874                 .type           = PSMOUSE_VMMOUSE,
 875                 .name           = VMMOUSE_PSNAME,
 876                 .alias          = "vmmouse",
 877                 .detect         = vmmouse_detect,
 878                 .init           = vmmouse_init,
 879         },
 880 #endif
 881 #ifdef CONFIG_MOUSE_PS2_BYD
 882         {
 883                 .type           = PSMOUSE_BYD,
 884                 .name           = "BYDPS/2",
 885                 .alias          = "byd",
 886                 .detect         = byd_detect,
 887                 .init           = byd_init,
 888         },
 889 #endif
 890         {
 891                 .type           = PSMOUSE_AUTO,
 892                 .name           = "auto",
 893                 .alias          = "any",
 894                 .maxproto       = true,
 895         },
 896 };
 897
 898 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 899 {
 900         int i;
 901
 902         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 903                 if (psmouse_protocols[i].type == type)
 904                         return &psmouse_protocols[i];
 905
 906         return NULL;
 907 }
 908
 909 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 910 {
 911         const struct psmouse_protocol *proto;
 912
 913         proto = __psmouse_protocol_by_type(type);
 914         if (proto)
 915                 return proto;
 916
 917         WARN_ON(1);
 918         return &psmouse_protocols[0];
 919 }
 920
 921 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 922 {
 923         const struct psmouse_protocol *p;
 924         int i;
 925
 926         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 927                 p = &psmouse_protocols[i];
 928
 929                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 930                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 931                         return &psmouse_protocols[i];
 932         }
 933
 934         return NULL;
 935 }
 936
 937 /*
 938  * Apply default settings to the psmouse structure. Most of them will
 939  * be overridden by individual protocol initialization routines.
 940  */
 941 static void psmouse_apply_defaults(struct psmouse *psmouse)
 942 {
 943         struct input_dev *input_dev = psmouse->dev;
 944
 945         memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
 946         memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
 947         memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
 948         memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
 949         memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
 950
 951         __set_bit(EV_KEY, input_dev->evbit);
 952         __set_bit(EV_REL, input_dev->evbit);
 953
 954         __set_bit(BTN_LEFT, input_dev->keybit);
 955         __set_bit(BTN_RIGHT, input_dev->keybit);
 956
 957         __set_bit(REL_X, input_dev->relbit);
 958         __set_bit(REL_Y, input_dev->relbit);
 959
 960         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 961
 962         psmouse->protocol = &psmouse_protocols[0];
 963
 964         psmouse->set_rate = psmouse_set_rate;
 965         psmouse->set_resolution = psmouse_set_resolution;
 966         psmouse->set_scale = psmouse_set_scale;
 967         psmouse->poll = psmouse_poll;
 968         psmouse->protocol_handler = psmouse_process_byte;
 969         psmouse->pktsize = 3;
 970         psmouse->reconnect = NULL;
 971         psmouse->fast_reconnect = NULL;
 972         psmouse->disconnect = NULL;
 973         psmouse->cleanup = NULL;
 974         psmouse->pt_activate = NULL;
 975         psmouse->pt_deactivate = NULL;
 976 }
 977
 978 static bool psmouse_try_protocol(struct psmouse *psmouse,
 979                                  enum psmouse_type type,
 980                                  unsigned int *max_proto,
 981                                  bool set_properties, bool init_allowed)
 982 {
 983         const struct psmouse_protocol *proto;
 984
 985         proto = __psmouse_protocol_by_type(type);
 986         if (!proto)
 987                 return false;
 988
 989         if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
 990             !proto->try_passthru) {
 991                 return false;
 992         }
 993
 994         if (set_properties)
 995                 psmouse_apply_defaults(psmouse);
 996
 997         if (proto->detect(psmouse, set_properties) != 0)
 998                 return false;
 999
1000         if (set_properties && proto->init && init_allowed) {
1001                 if (proto->init(psmouse) != 0) {
1002                         /*
1003                          * We detected device, but init failed. Adjust
1004                          * max_proto so we only try standard protocols.
1005                          */
1006                         if (*max_proto > PSMOUSE_IMEX)
1007                                 *max_proto = PSMOUSE_IMEX;
1008
1009                         return false;
1010                 }
1011         }
1012
1013         return true;
1014 }
1015
1016 /*
1017  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
1018  * the mouse may have.
1019  */
1020 static int psmouse_extensions(struct psmouse *psmouse,
1021                               unsigned int max_proto, bool set_properties)
1022 {
1023         bool synaptics_hardware = false;
1024         int ret;
1025
1026         /*
1027          * Always check for focaltech, this is safe as it uses pnp-id
1028          * matching.
1029          */
1030         if (psmouse_try_protocol(psmouse, PSMOUSE_FOCALTECH,
1031                                  &max_proto, set_properties, false)) {
1032                 if (max_proto > PSMOUSE_IMEX &&
1033                     IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
1034                     (!set_properties || focaltech_init(psmouse) == 0)) {
1035                         return PSMOUSE_FOCALTECH;
1036                 }
1037                 /*
1038                  * Restrict psmouse_max_proto so that psmouse_initialize()
1039                  * does not try to reset rate and resolution, because even
1040                  * that upsets the device.
1041                  * This also causes us to basically fall through to basic
1042                  * protocol detection, where we fully reset the mouse,
1043                  * and set it up as bare PS/2 protocol device.
1044                  */
1045                 psmouse_max_proto = max_proto = PSMOUSE_PS2;
1046         }
1047
1048         /*
1049          * We always check for LifeBook because it does not disturb mouse
1050          * (it only checks DMI information).
1051          */
1052         if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1053                                  set_properties, max_proto > PSMOUSE_IMEX))
1054                 return PSMOUSE_LIFEBOOK;
1055
1056         if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1057                                  set_properties, max_proto > PSMOUSE_IMEX))
1058                 return PSMOUSE_VMMOUSE;
1059
1060         /*
1061          * Try Kensington ThinkingMouse (we try first, because Synaptics
1062          * probe upsets the ThinkingMouse).
1063          */
1064         if (max_proto > PSMOUSE_IMEX &&
1065             psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1066                                  set_properties, true)) {
1067                 return PSMOUSE_THINKPS;
1068         }
1069
1070         /*
1071          * Try Synaptics TouchPad. Note that probing is done even if
1072          * Synaptics protocol support is disabled in config - we need to
1073          * know if it is Synaptics so we can reset it properly after
1074          * probing for IntelliMouse.
1075          */
1076         if (max_proto > PSMOUSE_PS2 &&
1077             psmouse_try_protocol(psmouse, PSMOUSE_SYNAPTICS, &max_proto,
1078                                  set_properties, false)) {
1079                 synaptics_hardware = true;
1080
1081                 if (max_proto > PSMOUSE_IMEX) {
1082                         /*
1083                          * Try activating protocol, but check if support is
1084                          * enabled first, since we try detecting Synaptics
1085                          * even when protocol is disabled.
1086                          */
1087                         if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
1088                             IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
1089                                 if (!set_properties)
1090                                         return PSMOUSE_SYNAPTICS;
1091
1092                                 ret = synaptics_init(psmouse);
1093                                 if (ret >= 0)
1094                                         return ret;
1095                         }
1096
1097                         /*
1098                          * Some Synaptics touchpads can emulate extended
1099                          * protocols (like IMPS/2).  Unfortunately
1100                          * Logitech/Genius probes confuse some firmware
1101                          * versions so we'll have to skip them.
1102                          */
1103                         max_proto = PSMOUSE_IMEX;
1104                 }
1105
1106                 /*
1107                  * Make sure that touchpad is in relative mode, gestures
1108                  * (taps) are enabled.
1109                  */
1110                 synaptics_reset(psmouse);
1111         }
1112
1113         /*
1114          * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1115          * because Finger Sensing Pad probe upsets some modules of Cypress
1116          * Trackpads.
1117          */
1118         if (max_proto > PSMOUSE_IMEX &&
1119             psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1120                                  set_properties, true)) {
1121                 return PSMOUSE_CYPRESS;
1122         }
1123
1124         /* Try ALPS TouchPad */
1125         if (max_proto > PSMOUSE_IMEX) {
1126                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1127                 if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1128                                          &max_proto, set_properties, true))
1129                         return PSMOUSE_ALPS;
1130         }
1131
1132         /* Try OLPC HGPK touchpad */
1133         if (max_proto > PSMOUSE_IMEX &&
1134             psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1135                                  set_properties, true)) {
1136                 return PSMOUSE_HGPK;
1137         }
1138
1139         /* Try Elantech touchpad */
1140         if (max_proto > PSMOUSE_IMEX &&
1141             psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1142                                  &max_proto, set_properties, true)) {
1143                 return PSMOUSE_ELANTECH;
1144         }
1145
1146         if (max_proto > PSMOUSE_IMEX) {
1147                 if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1148                                          &max_proto, set_properties, true))
1149                         return PSMOUSE_GENPS;
1150
1151                 if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1152                                          &max_proto, set_properties, true))
1153                         return PSMOUSE_PS2PP;
1154
1155                 if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1156                                          &max_proto, set_properties, true))
1157                         return PSMOUSE_TRACKPOINT;
1158
1159                 if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1160                                          &max_proto, set_properties, true))
1161                         return PSMOUSE_TOUCHKIT_PS2;
1162         }
1163
1164         /*
1165          * Try Finger Sensing Pad. We do it here because its probe upsets
1166          * Trackpoint devices (causing TP_READ_ID command to time out).
1167          */
1168         if (max_proto > PSMOUSE_IMEX &&
1169             psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1170                                  &max_proto, set_properties, true)) {
1171                 return PSMOUSE_FSP;
1172         }
1173
1174         /*
1175          * Reset to defaults in case the device got confused by extended
1176          * protocol probes. Note that we follow up with full reset because
1177          * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1178          */
1179         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1180         psmouse_reset(psmouse);
1181
1182         if (max_proto >= PSMOUSE_IMEX &&
1183             psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1184                                  &max_proto, set_properties, true)) {
1185                 return PSMOUSE_IMEX;
1186         }
1187
1188         if (max_proto >= PSMOUSE_IMPS &&
1189             psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1190                                  &max_proto, set_properties, true)) {
1191                 return PSMOUSE_IMPS;
1192         }
1193
1194         /*
1195          * Okay, all failed, we have a standard mouse here. The number of
1196          * the buttons is still a question, though. We assume 3.
1197          */
1198         psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1199                              &max_proto, set_properties, true);
1200
1201         if (synaptics_hardware) {
1202                 /*
1203                  * We detected Synaptics hardware but it did not respond to
1204                  * IMPS/2 probes.  We need to reset the touchpad because if
1205                  * there is a track point on the pass through port it could
1206                  * get disabled while probing for protocol extensions.
1207                  */
1208                 psmouse_reset(psmouse);
1209         }
1210
1211         return PSMOUSE_PS2;
1212 }
1213
1214 /*
1215  * psmouse_probe() probes for a PS/2 mouse.
1216  */
1217 static int psmouse_probe(struct psmouse *psmouse)
1218 {
1219         struct ps2dev *ps2dev = &psmouse->ps2dev;
1220         unsigned char param[2];
1221
1222         /*
1223          * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1224          * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1225          * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1226          * subsequent ID queries, probably due to a firmware bug.
1227          */
1228         param[0] = 0xa5;
1229         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
1230                 return -1;
1231
1232         if (param[0] != 0x00 && param[0] != 0x03 &&
1233             param[0] != 0x04 && param[0] != 0xff)
1234                 return -1;
1235
1236         /*
1237          * Then we reset and disable the mouse so that it doesn't generate
1238          * events.
1239          */
1240         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
1241                 psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
1242                              ps2dev->serio->phys);
1243
1244         return 0;
1245 }
1246
1247 /*
1248  * psmouse_initialize() initializes the mouse to a sane state.
1249  */
1250 static void psmouse_initialize(struct psmouse *psmouse)
1251 {
1252         /*
1253          * We set the mouse report rate, resolution and scaling.
1254          */
1255         if (psmouse_max_proto != PSMOUSE_PS2) {
1256                 psmouse->set_rate(psmouse, psmouse->rate);
1257                 psmouse->set_resolution(psmouse, psmouse->resolution);
1258                 psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1259         }
1260 }
1261
1262 /*
1263  * psmouse_activate() enables the mouse so that we get motion reports from it.
1264  */
1265 int psmouse_activate(struct psmouse *psmouse)
1266 {
1267         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1268                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1269                              psmouse->ps2dev.serio->phys);
1270                 return -1;
1271         }
1272
1273         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1274         return 0;
1275 }
1276
1277 /*
1278  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1279  * motion reports from it unless we explicitly request it.
1280  */
1281 int psmouse_deactivate(struct psmouse *psmouse)
1282 {
1283         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
1284                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
1285                              psmouse->ps2dev.serio->phys);
1286                 return -1;
1287         }
1288
1289         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1290         return 0;
1291 }
1292
1293 /*
1294  * psmouse_resync() attempts to re-validate current protocol.
1295  */
1296 static void psmouse_resync(struct work_struct *work)
1297 {
1298         struct psmouse *parent = NULL, *psmouse =
1299                 container_of(work, struct psmouse, resync_work.work);
1300         struct serio *serio = psmouse->ps2dev.serio;
1301         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1302         bool failed = false, enabled = false;
1303         int i;
1304
1305         mutex_lock(&psmouse_mutex);
1306
1307         if (psmouse->state != PSMOUSE_RESYNCING)
1308                 goto out;
1309
1310         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1311                 parent = serio_get_drvdata(serio->parent);
1312                 psmouse_deactivate(parent);
1313         }
1314
1315         /*
1316          * Some mice don't ACK commands sent while they are in the middle of
1317          * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1318          * instead of ps2_command() which would wait for 200ms for an ACK
1319          * that may never come.
1320          * As an additional quirk ALPS touchpads may not only forget to ACK
1321          * disable command but will stop reporting taps, so if we see that
1322          * mouse at least once ACKs disable we will do full reconnect if ACK
1323          * is missing.
1324          */
1325         psmouse->num_resyncs++;
1326
1327         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1328                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1329                         failed = true;
1330         } else
1331                 psmouse->acks_disable_command = true;
1332
1333         /*
1334          * Poll the mouse. If it was reset the packet will be shorter than
1335          * psmouse->pktsize and ps2_command will fail. We do not expect and
1336          * do not handle scenario when mouse "upgrades" its protocol while
1337          * disconnected since it would require additional delay. If we ever
1338          * see a mouse that does it we'll adjust the code.
1339          */
1340         if (!failed) {
1341                 if (psmouse->poll(psmouse))
1342                         failed = true;
1343                 else {
1344                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1345                         for (i = 0; i < psmouse->pktsize; i++) {
1346                                 psmouse->pktcnt++;
1347                                 rc = psmouse->protocol_handler(psmouse);
1348                                 if (rc != PSMOUSE_GOOD_DATA)
1349                                         break;
1350                         }
1351                         if (rc != PSMOUSE_FULL_PACKET)
1352                                 failed = true;
1353                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1354                 }
1355         }
1356
1357         /*
1358          * Now try to enable mouse. We try to do that even if poll failed
1359          * and also repeat our attempts 5 times, otherwise we may be left
1360          * out with disabled mouse.
1361          */
1362         for (i = 0; i < 5; i++) {
1363                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1364                         enabled = true;
1365                         break;
1366                 }
1367                 msleep(200);
1368         }
1369
1370         if (!enabled) {
1371                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1372                              psmouse->ps2dev.serio->phys);
1373                 failed = true;
1374         }
1375
1376         if (failed) {
1377                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1378                 psmouse_info(psmouse,
1379                              "resync failed, issuing reconnect request\n");
1380                 serio_reconnect(serio);
1381         } else
1382                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1383
1384         if (parent)
1385                 psmouse_activate(parent);
1386  out:
1387         mutex_unlock(&psmouse_mutex);
1388 }
1389
1390 /*
1391  * psmouse_cleanup() resets the mouse into power-on state.
1392  */
1393 static void psmouse_cleanup(struct serio *serio)
1394 {
1395         struct psmouse *psmouse = serio_get_drvdata(serio);
1396         struct psmouse *parent = NULL;
1397
1398         mutex_lock(&psmouse_mutex);
1399
1400         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1401                 parent = serio_get_drvdata(serio->parent);
1402                 psmouse_deactivate(parent);
1403         }
1404
1405         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1406
1407         /*
1408          * Disable stream mode so cleanup routine can proceed undisturbed.
1409          */
1410         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1411                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1412                              psmouse->ps2dev.serio->phys);
1413
1414         if (psmouse->cleanup)
1415                 psmouse->cleanup(psmouse);
1416
1417         /*
1418          * Reset the mouse to defaults (bare PS/2 protocol).
1419          */
1420         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1421
1422         /*
1423          * Some boxes, such as HP nx7400, get terribly confused if mouse
1424          * is not fully enabled before suspending/shutting down.
1425          */
1426         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1427
1428         if (parent) {
1429                 if (parent->pt_deactivate)
1430                         parent->pt_deactivate(parent);
1431
1432                 psmouse_activate(parent);
1433         }
1434
1435         mutex_unlock(&psmouse_mutex);
1436 }
1437
1438 /*
1439  * psmouse_disconnect() closes and frees.
1440  */
1441 static void psmouse_disconnect(struct serio *serio)
1442 {
1443         struct psmouse *psmouse = serio_get_drvdata(serio);
1444         struct psmouse *parent = NULL;
1445
1446         sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1447
1448         mutex_lock(&psmouse_mutex);
1449
1450         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1451
1452         /* make sure we don't have a resync in progress */
1453         mutex_unlock(&psmouse_mutex);
1454         flush_workqueue(kpsmoused_wq);
1455         mutex_lock(&psmouse_mutex);
1456
1457         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1458                 parent = serio_get_drvdata(serio->parent);
1459                 psmouse_deactivate(parent);
1460         }
1461
1462         if (psmouse->disconnect)
1463                 psmouse->disconnect(psmouse);
1464
1465         if (parent && parent->pt_deactivate)
1466                 parent->pt_deactivate(parent);
1467
1468         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1469
1470         serio_close(serio);
1471         serio_set_drvdata(serio, NULL);
1472
1473         if (psmouse->dev)
1474                 input_unregister_device(psmouse->dev);
1475
1476         kfree(psmouse);
1477
1478         if (parent)
1479                 psmouse_activate(parent);
1480
1481         mutex_unlock(&psmouse_mutex);
1482 }
1483
1484 static int psmouse_switch_protocol(struct psmouse *psmouse,
1485                                    const struct psmouse_protocol *proto)
1486 {
1487         const struct psmouse_protocol *selected_proto;
1488         struct input_dev *input_dev = psmouse->dev;
1489         enum psmouse_type type;
1490
1491         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1492
1493         if (proto && (proto->detect || proto->init)) {
1494                 psmouse_apply_defaults(psmouse);
1495
1496                 if (proto->detect && proto->detect(psmouse, true) < 0)
1497                         return -1;
1498
1499                 if (proto->init && proto->init(psmouse) < 0)
1500                         return -1;
1501
1502                 selected_proto = proto;
1503         } else {
1504                 type = psmouse_extensions(psmouse, psmouse_max_proto, true);
1505                 selected_proto = psmouse_protocol_by_type(type);
1506         }
1507
1508         psmouse->protocol = selected_proto;
1509
1510         /*
1511          * If mouse's packet size is 3 there is no point in polling the
1512          * device in hopes to detect protocol reset - we won't get less
1513          * than 3 bytes response anyhow.
1514          */
1515         if (psmouse->pktsize == 3)
1516                 psmouse->resync_time = 0;
1517
1518         /*
1519          * Some smart KVMs fake response to POLL command returning just
1520          * 3 bytes and messing up our resync logic, so if initial poll
1521          * fails we won't try polling the device anymore. Hopefully
1522          * such KVM will maintain initially selected protocol.
1523          */
1524         if (psmouse->resync_time && psmouse->poll(psmouse))
1525                 psmouse->resync_time = 0;
1526
1527         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1528                  selected_proto->name, psmouse->vendor, psmouse->name);
1529
1530         input_dev->name = psmouse->devname;
1531         input_dev->phys = psmouse->phys;
1532         input_dev->id.bustype = BUS_I8042;
1533         input_dev->id.vendor = 0x0002;
1534         input_dev->id.product = psmouse->protocol->type;
1535         input_dev->id.version = psmouse->model;
1536
1537         return 0;
1538 }
1539
1540 /*
1541  * psmouse_connect() is a callback from the serio module when
1542  * an unhandled serio port is found.
1543  */
1544 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1545 {
1546         struct psmouse *psmouse, *parent = NULL;
1547         struct input_dev *input_dev;
1548         int retval = 0, error = -ENOMEM;
1549
1550         mutex_lock(&psmouse_mutex);
1551
1552         /*
1553          * If this is a pass-through port deactivate parent so the device
1554          * connected to this port can be successfully identified
1555          */
1556         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1557                 parent = serio_get_drvdata(serio->parent);
1558                 psmouse_deactivate(parent);
1559         }
1560
1561         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1562         input_dev = input_allocate_device();
1563         if (!psmouse || !input_dev)
1564                 goto err_free;
1565
1566         ps2_init(&psmouse->ps2dev, serio);
1567         INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1568         psmouse->dev = input_dev;
1569         snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1570
1571         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1572
1573         serio_set_drvdata(serio, psmouse);
1574
1575         error = serio_open(serio, drv);
1576         if (error)
1577                 goto err_clear_drvdata;
1578
1579         /* give PT device some time to settle down before probing */
1580         if (serio->id.type == SERIO_PS_PSTHRU)
1581                 usleep_range(10000, 15000);
1582
1583         if (psmouse_probe(psmouse) < 0) {
1584                 error = -ENODEV;
1585                 goto err_close_serio;
1586         }
1587
1588         psmouse->rate = psmouse_rate;
1589         psmouse->resolution = psmouse_resolution;
1590         psmouse->resetafter = psmouse_resetafter;
1591         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1592         psmouse->smartscroll = psmouse_smartscroll;
1593
1594         psmouse_switch_protocol(psmouse, NULL);
1595
1596         if (!psmouse->protocol->smbus_companion) {
1597                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1598                 psmouse_initialize(psmouse);
1599
1600                 error = input_register_device(input_dev);
1601                 if (error)
1602                         goto err_protocol_disconnect;
1603         } else {
1604                 /* Smbus companion will be reporting events, not us. */
1605                 input_free_device(input_dev);
1606                 psmouse->dev = input_dev = NULL;
1607         }
1608
1609         if (parent && parent->pt_activate)
1610                 parent->pt_activate(parent);
1611
1612         error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1613         if (error)
1614                 goto err_pt_deactivate;
1615
1616         /*
1617          * PS/2 devices having SMBus companions should stay disabled
1618          * on PS/2 side, in order to have SMBus part operable.
1619          */
1620         if (!psmouse->protocol->smbus_companion)
1621                 psmouse_activate(psmouse);
1622
1623  out:
1624         /* If this is a pass-through port the parent needs to be re-activated */
1625         if (parent)
1626                 psmouse_activate(parent);
1627
1628         mutex_unlock(&psmouse_mutex);
1629         return retval;
1630
1631  err_pt_deactivate:
1632         if (parent && parent->pt_deactivate)
1633                 parent->pt_deactivate(parent);
1634         if (input_dev) {
1635                 input_unregister_device(input_dev);
1636                 input_dev = NULL; /* so we don't try to free it below */
1637         }
1638  err_protocol_disconnect:
1639         if (psmouse->disconnect)
1640                 psmouse->disconnect(psmouse);
1641         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1642  err_close_serio:
1643         serio_close(serio);
1644  err_clear_drvdata:
1645         serio_set_drvdata(serio, NULL);
1646  err_free:
1647         input_free_device(input_dev);
1648         kfree(psmouse);
1649
1650         retval = error;
1651         goto out;
1652 }
1653
1654 static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
1655 {
1656         struct psmouse *psmouse = serio_get_drvdata(serio);
1657         struct psmouse *parent = NULL;
1658         int (*reconnect_handler)(struct psmouse *);
1659         enum psmouse_type type;
1660         int rc = -1;
1661
1662         mutex_lock(&psmouse_mutex);
1663
1664         if (fast_reconnect) {
1665                 reconnect_handler = psmouse->fast_reconnect;
1666                 if (!reconnect_handler) {
1667                         rc = -ENOENT;
1668                         goto out_unlock;
1669                 }
1670         } else {
1671                 reconnect_handler = psmouse->reconnect;
1672         }
1673
1674         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1675                 parent = serio_get_drvdata(serio->parent);
1676                 psmouse_deactivate(parent);
1677         }
1678
1679         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1680
1681         if (reconnect_handler) {
1682                 if (reconnect_handler(psmouse))
1683                         goto out;
1684         } else {
1685                 psmouse_reset(psmouse);
1686
1687                 if (psmouse_probe(psmouse) < 0)
1688                         goto out;
1689
1690                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1691                 if (psmouse->protocol->type != type)
1692                         goto out;
1693         }
1694
1695         /*
1696          * OK, the device type (and capabilities) match the old one,
1697          * we can continue using it, complete initialization
1698          */
1699         if (!psmouse->protocol->smbus_companion) {
1700                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1701                 psmouse_initialize(psmouse);
1702         }
1703
1704         if (parent && parent->pt_activate)
1705                 parent->pt_activate(parent);
1706
1707         /*
1708          * PS/2 devices having SMBus companions should stay disabled
1709          * on PS/2 side, in order to have SMBus part operable.
1710          */
1711         if (!psmouse->protocol->smbus_companion)
1712                 psmouse_activate(psmouse);
1713
1714         rc = 0;
1715
1716 out:
1717         /* If this is a pass-through port the parent waits to be activated */
1718         if (parent)
1719                 psmouse_activate(parent);
1720
1721 out_unlock:
1722         mutex_unlock(&psmouse_mutex);
1723         return rc;
1724 }
1725
1726 static int psmouse_reconnect(struct serio *serio)
1727 {
1728         return __psmouse_reconnect(serio, false);
1729 }
1730
1731 static int psmouse_fast_reconnect(struct serio *serio)
1732 {
1733         return __psmouse_reconnect(serio, true);
1734 }
1735
1736 static struct serio_device_id psmouse_serio_ids[] = {
1737         {
1738                 .type   = SERIO_8042,
1739                 .proto  = SERIO_ANY,
1740                 .id     = SERIO_ANY,
1741                 .extra  = SERIO_ANY,
1742         },
1743         {
1744                 .type   = SERIO_PS_PSTHRU,
1745                 .proto  = SERIO_ANY,
1746                 .id     = SERIO_ANY,
1747                 .extra  = SERIO_ANY,
1748         },
1749         { 0 }
1750 };
1751
1752 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1753
1754 static struct serio_driver psmouse_drv = {
1755         .driver         = {
1756                 .name   = "psmouse",
1757         },
1758         .description    = DRIVER_DESC,
1759         .id_table       = psmouse_serio_ids,
1760         .interrupt      = psmouse_interrupt,
1761         .connect        = psmouse_connect,
1762         .reconnect      = psmouse_reconnect,
1763         .fast_reconnect = psmouse_fast_reconnect,
1764         .disconnect     = psmouse_disconnect,
1765         .cleanup        = psmouse_cleanup,
1766 };
1767
1768 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1769                                  char *buf)
1770 {
1771         struct serio *serio = to_serio_port(dev);
1772         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1773         struct psmouse *psmouse = serio_get_drvdata(serio);
1774
1775         if (psmouse->protocol->smbus_companion &&
1776                         devattr != &psmouse_attr_protocol.dattr)
1777                 return -ENOENT;
1778
1779         return attr->show(psmouse, attr->data, buf);
1780 }
1781
1782 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1783                                 const char *buf, size_t count)
1784 {
1785         struct serio *serio = to_serio_port(dev);
1786         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1787         struct psmouse *psmouse, *parent = NULL;
1788         int retval;
1789
1790         retval = mutex_lock_interruptible(&psmouse_mutex);
1791         if (retval)
1792                 goto out;
1793
1794         psmouse = serio_get_drvdata(serio);
1795
1796         if (psmouse->protocol->smbus_companion &&
1797                         devattr != &psmouse_attr_protocol.dattr) {
1798                 retval = -ENOENT;
1799                 goto out_unlock;
1800         }
1801
1802         if (attr->protect) {
1803                 if (psmouse->state == PSMOUSE_IGNORE) {
1804                         retval = -ENODEV;
1805                         goto out_unlock;
1806                 }
1807
1808                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1809                         parent = serio_get_drvdata(serio->parent);
1810                         psmouse_deactivate(parent);
1811                 }
1812
1813                 if (!psmouse->protocol->smbus_companion)
1814                         psmouse_deactivate(psmouse);
1815         }
1816
1817         retval = attr->set(psmouse, attr->data, buf, count);
1818
1819         if (attr->protect) {
1820                 if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
1821                         psmouse_activate(psmouse);
1822
1823                 if (parent)
1824                         psmouse_activate(parent);
1825         }
1826
1827  out_unlock:
1828         mutex_unlock(&psmouse_mutex);
1829  out:
1830         return retval;
1831 }
1832
1833 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1834 {
1835         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1836
1837         return sprintf(buf, "%u\n", *field);
1838 }
1839
1840 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1841 {
1842         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1843         unsigned int value;
1844         int err;
1845
1846         err = kstrtouint(buf, 10, &value);
1847         if (err)
1848                 return err;
1849
1850         *field = value;
1851
1852         return count;
1853 }
1854
1855 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1856 {
1857         return sprintf(buf, "%s\n", psmouse->protocol->name);
1858 }
1859
1860 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1861 {
1862         struct serio *serio = psmouse->ps2dev.serio;
1863         struct psmouse *parent = NULL;
1864         struct input_dev *old_dev, *new_dev;
1865         const struct psmouse_protocol *proto, *old_proto;
1866         int error;
1867         int retry = 0;
1868
1869         proto = psmouse_protocol_by_name(buf, count);
1870         if (!proto)
1871                 return -EINVAL;
1872
1873         if (psmouse->protocol == proto)
1874                 return count;
1875
1876         new_dev = input_allocate_device();
1877         if (!new_dev)
1878                 return -ENOMEM;
1879
1880         while (!list_empty(&serio->children)) {
1881                 if (++retry > 3) {
1882                         psmouse_warn(psmouse,
1883                                      "failed to destroy children ports, protocol change aborted.\n");
1884                         input_free_device(new_dev);
1885                         return -EIO;
1886                 }
1887
1888                 mutex_unlock(&psmouse_mutex);
1889                 serio_unregister_child_port(serio);
1890                 mutex_lock(&psmouse_mutex);
1891
1892                 if (serio->drv != &psmouse_drv) {
1893                         input_free_device(new_dev);
1894                         return -ENODEV;
1895                 }
1896
1897                 if (psmouse->protocol == proto) {
1898                         input_free_device(new_dev);
1899                         return count; /* switched by other thread */
1900                 }
1901         }
1902
1903         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1904                 parent = serio_get_drvdata(serio->parent);
1905                 if (parent->pt_deactivate)
1906                         parent->pt_deactivate(parent);
1907         }
1908
1909         old_dev = psmouse->dev;
1910         old_proto = psmouse->protocol;
1911
1912         if (psmouse->disconnect)
1913                 psmouse->disconnect(psmouse);
1914
1915         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1916
1917         psmouse->dev = new_dev;
1918         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1919
1920         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1921                 psmouse_reset(psmouse);
1922                 /* default to PSMOUSE_PS2 */
1923                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1924         }
1925
1926         psmouse_initialize(psmouse);
1927         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1928
1929         if (psmouse->protocol->smbus_companion) {
1930                 input_free_device(psmouse->dev);
1931                 psmouse->dev = NULL;
1932         } else {
1933                 error = input_register_device(psmouse->dev);
1934                 if (error) {
1935                         if (psmouse->disconnect)
1936                                 psmouse->disconnect(psmouse);
1937
1938                         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1939                         input_free_device(new_dev);
1940                         psmouse->dev = old_dev;
1941                         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1942                         psmouse_switch_protocol(psmouse, old_proto);
1943                         psmouse_initialize(psmouse);
1944                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1945
1946                         return error;
1947                 }
1948         }
1949
1950         if (old_dev)
1951                 input_unregister_device(old_dev);
1952
1953         if (parent && parent->pt_activate)
1954                 parent->pt_activate(parent);
1955
1956         return count;
1957 }
1958
1959 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1960 {
1961         unsigned int value;
1962         int err;
1963
1964         err = kstrtouint(buf, 10, &value);
1965         if (err)
1966                 return err;
1967
1968         psmouse->set_rate(psmouse, value);
1969         return count;
1970 }
1971
1972 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1973 {
1974         unsigned int value;
1975         int err;
1976
1977         err = kstrtouint(buf, 10, &value);
1978         if (err)
1979                 return err;
1980
1981         psmouse->set_resolution(psmouse, value);
1982         return count;
1983 }
1984
1985
1986 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
1987 {
1988         const struct psmouse_protocol *proto;
1989
1990         if (!val)
1991                 return -EINVAL;
1992
1993         proto = psmouse_protocol_by_name(val, strlen(val));
1994
1995         if (!proto || !proto->maxproto)
1996                 return -EINVAL;
1997
1998         *((unsigned int *)kp->arg) = proto->type;
1999
2000         return 0;
2001 }
2002
2003 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
2004 {
2005         int type = *((unsigned int *)kp->arg);
2006
2007         return sprintf(buffer, "%s", psmouse_protocol_by_type(type)->name);
2008 }
2009
2010 static int __init psmouse_init(void)
2011 {
2012         int err;
2013
2014         lifebook_module_init();
2015         synaptics_module_init();
2016         hgpk_module_init();
2017
2018         err = psmouse_smbus_module_init();
2019         if (err)
2020                 return err;
2021
2022         kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
2023         if (!kpsmoused_wq) {
2024                 pr_err("failed to create kpsmoused workqueue\n");
2025                 err = -ENOMEM;
2026                 goto err_smbus_exit;
2027         }
2028
2029         err = serio_register_driver(&psmouse_drv);
2030         if (err)
2031                 goto err_destroy_wq;
2032
2033         return 0;
2034
2035 err_destroy_wq:
2036         destroy_workqueue(kpsmoused_wq);
2037 err_smbus_exit:
2038         psmouse_smbus_module_exit();
2039         return err;
2040 }
2041
2042 static void __exit psmouse_exit(void)
2043 {
2044         serio_unregister_driver(&psmouse_drv);
2045         destroy_workqueue(kpsmoused_wq);
2046         psmouse_smbus_module_exit();
2047 }
2048
2049 module_init(psmouse_init);
2050 module_exit(psmouse_exit);