drivers/input/mouse/psmouse-base.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PS/2 mouse driver
   4  *
   5  * Copyright (c) 1999-2002 Vojtech Pavlik
   6  * Copyright (c) 2003-2004 Dmitry Torokhov
   7  */
   8
   9
  10 #define pr_fmt(fmt)             KBUILD_MODNAME ": " fmt
  11 #define psmouse_fmt(fmt)        fmt
  12
  13 #include <linux/bitops.h>
  14 #include <linux/delay.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/input.h>
  19 #include <linux/serio.h>
  20 #include <linux/init.h>
  21 #include <linux/libps2.h>
  22 #include <linux/mutex.h>
  23 #include <linux/types.h>
  24
  25 #include "psmouse.h"
  26 #include "synaptics.h"
  27 #include "logips2pp.h"
  28 #include "alps.h"
  29 #include "hgpk.h"
  30 #include "lifebook.h"
  31 #include "trackpoint.h"
  32 #include "touchkit_ps2.h"
  33 #include "elantech.h"
  34 #include "sentelic.h"
  35 #include "cypress_ps2.h"
  36 #include "focaltech.h"
  37 #include "vmmouse.h"
  38 #include "byd.h"
  39
  40 #define DRIVER_DESC     "PS/2 mouse driver"
  41
  42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  43 MODULE_DESCRIPTION(DRIVER_DESC);
  44 MODULE_LICENSE("GPL");
  45
  46 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
  47 static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
  48 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
  49 static const struct kernel_param_ops param_ops_proto_abbrev = {
  50         .set = psmouse_set_maxproto,
  51         .get = psmouse_get_maxproto,
  52 };
  53 #define param_check_proto_abbrev(name, p)       __param_check(name, p, unsigned int)
  54 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
  55 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
  56
  57 static unsigned int psmouse_resolution = 200;
  58 module_param_named(resolution, psmouse_resolution, uint, 0644);
  59 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
  60
  61 static unsigned int psmouse_rate = 100;
  62 module_param_named(rate, psmouse_rate, uint, 0644);
  63 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
  64
  65 static bool psmouse_smartscroll = true;
  66 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
  67 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
  68
  69 static bool psmouse_a4tech_2wheels;
  70 module_param_named(a4tech_workaround, psmouse_a4tech_2wheels, bool, 0644);
  71 MODULE_PARM_DESC(a4tech_workaround, "A4Tech second scroll wheel workaround, 1 = enabled, 0 = disabled (default).");
  72
  73 static unsigned int psmouse_resetafter = 5;
  74 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
  75 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
  76
  77 static unsigned int psmouse_resync_time;
  78 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
  79 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
  80
  81 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
  82                         NULL,
  83                         psmouse_attr_show_protocol, psmouse_attr_set_protocol);
  84 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
  85                         (void *) offsetof(struct psmouse, rate),
  86                         psmouse_show_int_attr, psmouse_attr_set_rate);
  87 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
  88                         (void *) offsetof(struct psmouse, resolution),
  89                         psmouse_show_int_attr, psmouse_attr_set_resolution);
  90 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
  91                         (void *) offsetof(struct psmouse, resetafter),
  92                         psmouse_show_int_attr, psmouse_set_int_attr);
  93 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
  94                         (void *) offsetof(struct psmouse, resync_time),
  95                         psmouse_show_int_attr, psmouse_set_int_attr);
  96
  97 static struct attribute *psmouse_attributes[] = {
  98         &psmouse_attr_protocol.dattr.attr,
  99         &psmouse_attr_rate.dattr.attr,
 100         &psmouse_attr_resolution.dattr.attr,
 101         &psmouse_attr_resetafter.dattr.attr,
 102         &psmouse_attr_resync_time.dattr.attr,
 103         NULL
 104 };
 105
 106 static const struct attribute_group psmouse_attribute_group = {
 107         .attrs  = psmouse_attributes,
 108 };
 109
 110 /*
 111  * psmouse_mutex protects all operations changing state of mouse
 112  * (connecting, disconnecting, changing rate or resolution via
 113  * sysfs). We could use a per-device semaphore but since there
 114  * rarely more than one PS/2 mouse connected and since semaphore
 115  * is taken in "slow" paths it is not worth it.
 116  */
 117 static DEFINE_MUTEX(psmouse_mutex);
 118
 119 static struct workqueue_struct *kpsmoused_wq;
 120
 121 void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
 122 {
 123         input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
 124         input_report_key(dev, BTN_MIDDLE, buttons & BIT(2));
 125         input_report_key(dev, BTN_RIGHT,  buttons & BIT(1));
 126 }
 127
 128 void psmouse_report_standard_motion(struct input_dev *dev, u8 *packet)
 129 {
 130         int x, y;
 131
 132         x = packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0;
 133         y = packet[2] ? packet[2] - ((packet[0] << 3) & 0x100) : 0;
 134
 135         input_report_rel(dev, REL_X, x);
 136         input_report_rel(dev, REL_Y, -y);
 137 }
 138
 139 void psmouse_report_standard_packet(struct input_dev *dev, u8 *packet)
 140 {
 141         psmouse_report_standard_buttons(dev, packet[0]);
 142         psmouse_report_standard_motion(dev, packet);
 143 }
 144
 145 /*
 146  * psmouse_process_byte() analyzes the PS/2 data stream and reports
 147  * relevant events to the input module once full packet has arrived.
 148  */
 149 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 150 {
 151         struct input_dev *dev = psmouse->dev;
 152         u8 *packet = psmouse->packet;
 153         int wheel;
 154
 155         if (psmouse->pktcnt < psmouse->pktsize)
 156                 return PSMOUSE_GOOD_DATA;
 157
 158         /* Full packet accumulated, process it */
 159
 160         switch (psmouse->protocol->type) {
 161         case PSMOUSE_IMPS:
 162                 /* IntelliMouse has scroll wheel */
 163                 input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
 164                 break;
 165
 166         case PSMOUSE_IMEX:
 167                 /* Scroll wheel and buttons on IntelliMouse Explorer */
 168                 switch (packet[3] & 0xC0) {
 169                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 170                         input_report_rel(dev, REL_WHEEL,
 171                                          -sign_extend32(packet[3], 5));
 172                         break;
 173                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 174                         input_report_rel(dev, REL_HWHEEL,
 175                                          -sign_extend32(packet[3], 5));
 176                         break;
 177                 case 0x00:
 178                 case 0xC0:
 179                         wheel = sign_extend32(packet[3], 3);
 180
 181                         /*
 182                          * Some A4Tech mice have two scroll wheels, with first
 183                          * one reporting +/-1 in the lower nibble, and second
 184                          * one reporting +/-2.
 185                          */
 186                         if (psmouse_a4tech_2wheels && abs(wheel) > 1)
 187                                 input_report_rel(dev, REL_HWHEEL, wheel / 2);
 188                         else
 189                                 input_report_rel(dev, REL_WHEEL, -wheel);
 190
 191                         input_report_key(dev, BTN_SIDE,  packet[3] & BIT(4));
 192                         input_report_key(dev, BTN_EXTRA, packet[3] & BIT(5));
 193                         break;
 194                 }
 195                 break;
 196
 197         case PSMOUSE_GENPS:
 198                 /* Report scroll buttons on NetMice */
 199                 input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
 200
 201                 /* Extra buttons on Genius NewNet 3D */
 202                 input_report_key(dev, BTN_SIDE,  packet[0] & BIT(6));
 203                 input_report_key(dev, BTN_EXTRA, packet[0] & BIT(7));
 204                 break;
 205
 206         case PSMOUSE_THINKPS:
 207                 /* Extra button on ThinkingMouse */
 208                 input_report_key(dev, BTN_EXTRA, packet[0] & BIT(3));
 209
 210                 /*
 211                  * Without this bit of weirdness moving up gives wildly
 212                  * high Y changes.
 213                  */
 214                 packet[1] |= (packet[0] & 0x40) << 1;
 215                 break;
 216
 217         case PSMOUSE_CORTRON:
 218                 /*
 219                  * Cortron PS2 Trackball reports SIDE button in the
 220                  * 4th bit of the first byte.
 221                  */
 222                 input_report_key(dev, BTN_SIDE, packet[0] & BIT(3));
 223                 packet[0] |= BIT(3);
 224                 break;
 225
 226         default:
 227                 break;
 228         }
 229
 230         /* Generic PS/2 Mouse */
 231         packet[0] |= psmouse->extra_buttons;
 232         psmouse_report_standard_packet(dev, packet);
 233
 234         input_sync(dev);
 235
 236         return PSMOUSE_FULL_PACKET;
 237 }
 238
 239 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 240                 unsigned long delay)
 241 {
 242         queue_delayed_work(kpsmoused_wq, work, delay);
 243 }
 244
 245 /*
 246  * __psmouse_set_state() sets new psmouse state and resets all flags.
 247  */
 248 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 249 {
 250         psmouse->state = new_state;
 251         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 252         psmouse->ps2dev.flags = 0;
 253         psmouse->last = jiffies;
 254 }
 255
 256 /*
 257  * psmouse_set_state() sets new psmouse state and resets all flags and
 258  * counters while holding serio lock so fighting with interrupt handler
 259  * is not a concern.
 260  */
 261 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 262 {
 263         serio_pause_rx(psmouse->ps2dev.serio);
 264         __psmouse_set_state(psmouse, new_state);
 265         serio_continue_rx(psmouse->ps2dev.serio);
 266 }
 267
 268 /*
 269  * psmouse_handle_byte() processes one byte of the input data stream
 270  * by calling corresponding protocol handler.
 271  */
 272 static int psmouse_handle_byte(struct psmouse *psmouse)
 273 {
 274         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 275
 276         switch (rc) {
 277         case PSMOUSE_BAD_DATA:
 278                 if (psmouse->state == PSMOUSE_ACTIVATED) {
 279                         psmouse_warn(psmouse,
 280                                      "%s at %s lost sync at byte %d\n",
 281                                      psmouse->name, psmouse->phys,
 282                                      psmouse->pktcnt);
 283                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 284                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 285                                 psmouse_notice(psmouse,
 286                                                 "issuing reconnect request\n");
 287                                 serio_reconnect(psmouse->ps2dev.serio);
 288                                 return -EIO;
 289                         }
 290                 }
 291                 psmouse->pktcnt = 0;
 292                 break;
 293
 294         case PSMOUSE_FULL_PACKET:
 295                 psmouse->pktcnt = 0;
 296                 if (psmouse->out_of_sync_cnt) {
 297                         psmouse->out_of_sync_cnt = 0;
 298                         psmouse_notice(psmouse,
 299                                         "%s at %s - driver resynced.\n",
 300                                         psmouse->name, psmouse->phys);
 301                 }
 302                 break;
 303
 304         case PSMOUSE_GOOD_DATA:
 305                 break;
 306         }
 307         return 0;
 308 }
 309
 310 static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
 311 {
 312         switch (psmouse->oob_data_type) {
 313         case PSMOUSE_OOB_NONE:
 314                 psmouse->oob_data_type = data;
 315                 break;
 316
 317         case PSMOUSE_OOB_EXTRA_BTNS:
 318                 psmouse_report_standard_buttons(psmouse->dev, data);
 319                 input_sync(psmouse->dev);
 320
 321                 psmouse->extra_buttons = data;
 322                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 323                 break;
 324
 325         default:
 326                 psmouse_warn(psmouse,
 327                              "unknown OOB_DATA type: 0x%02x\n",
 328                              psmouse->oob_data_type);
 329                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 330                 break;
 331         }
 332 }
 333
 334 /*
 335  * psmouse_interrupt() handles incoming characters, either passing them
 336  * for normal processing or gathering them as command response.
 337  */
 338 static irqreturn_t psmouse_interrupt(struct serio *serio,
 339                                      u8 data, unsigned int flags)
 340 {
 341         struct psmouse *psmouse = serio_get_drvdata(serio);
 342
 343         if (psmouse->state == PSMOUSE_IGNORE)
 344                 goto out;
 345
 346         if (unlikely((flags & SERIO_TIMEOUT) ||
 347                      ((flags & SERIO_PARITY) &&
 348                       !psmouse->protocol->ignore_parity))) {
 349
 350                 if (psmouse->state == PSMOUSE_ACTIVATED)
 351                         psmouse_warn(psmouse,
 352                                      "bad data from KBC -%s%s\n",
 353                                      flags & SERIO_TIMEOUT ? " timeout" : "",
 354                                      flags & SERIO_PARITY ? " bad parity" : "");
 355                 ps2_cmd_aborted(&psmouse->ps2dev);
 356                 goto out;
 357         }
 358
 359         if (flags & SERIO_OOB_DATA) {
 360                 psmouse_handle_oob_data(psmouse, data);
 361                 goto out;
 362         }
 363
 364         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
 365                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
 366                         goto out;
 367
 368         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
 369                 if  (ps2_handle_response(&psmouse->ps2dev, data))
 370                         goto out;
 371
 372         pm_wakeup_event(&serio->dev, 0);
 373
 374         if (psmouse->state <= PSMOUSE_RESYNCING)
 375                 goto out;
 376
 377         if (psmouse->state == PSMOUSE_ACTIVATED &&
 378             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 379                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 380                              psmouse->name, psmouse->phys, psmouse->pktcnt);
 381                 psmouse->badbyte = psmouse->packet[0];
 382                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 383                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 384                 goto out;
 385         }
 386
 387         psmouse->packet[psmouse->pktcnt++] = data;
 388
 389         /* Check if this is a new device announcement (0xAA 0x00) */
 390         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 391                 if (psmouse->pktcnt == 1) {
 392                         psmouse->last = jiffies;
 393                         goto out;
 394                 }
 395
 396                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 397                     (psmouse->protocol->type == PSMOUSE_HGPK &&
 398                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 399                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 400                         serio_reconnect(serio);
 401                         goto out;
 402                 }
 403
 404                 /* Not a new device, try processing first byte normally */
 405                 psmouse->pktcnt = 1;
 406                 if (psmouse_handle_byte(psmouse))
 407                         goto out;
 408
 409                 psmouse->packet[psmouse->pktcnt++] = data;
 410         }
 411
 412         /*
 413          * See if we need to force resync because mouse was idle for
 414          * too long.
 415          */
 416         if (psmouse->state == PSMOUSE_ACTIVATED &&
 417             psmouse->pktcnt == 1 && psmouse->resync_time &&
 418             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 419                 psmouse->badbyte = psmouse->packet[0];
 420                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 421                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 422                 goto out;
 423         }
 424
 425         psmouse->last = jiffies;
 426         psmouse_handle_byte(psmouse);
 427
 428  out:
 429         return IRQ_HANDLED;
 430 }
 431
 432 /*
 433  * psmouse_reset() resets the mouse into power-on state.
 434  */
 435 int psmouse_reset(struct psmouse *psmouse)
 436 {
 437         u8 param[2];
 438         int error;
 439
 440         error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT);
 441         if (error)
 442                 return error;
 443
 444         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 445                 return -EIO;
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * Here we set the mouse resolution.
 452  */
 453 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 454 {
 455         static const u8 params[] = { 0, 1, 2, 2, 3 };
 456         u8 p;
 457
 458         if (resolution == 0 || resolution > 200)
 459                 resolution = 200;
 460
 461         p = params[resolution / 50];
 462         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 463         psmouse->resolution = 25 << p;
 464 }
 465
 466 /*
 467  * Here we set the mouse report rate.
 468  */
 469 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 470 {
 471         static const u8 rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 472         u8 r;
 473         int i = 0;
 474
 475         while (rates[i] > rate)
 476                 i++;
 477         r = rates[i];
 478         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 479         psmouse->rate = r;
 480 }
 481
 482 /*
 483  * Here we set the mouse scaling.
 484  */
 485 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 486 {
 487         ps2_command(&psmouse->ps2dev, NULL,
 488                     scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 489                                                PSMOUSE_CMD_SETSCALE11);
 490 }
 491
 492 /*
 493  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 494  */
 495 static int psmouse_poll(struct psmouse *psmouse)
 496 {
 497         return ps2_command(&psmouse->ps2dev, psmouse->packet,
 498                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 499 }
 500
 501 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 502 {
 503         int i;
 504
 505         for (i = 0; ids[i]; i++)
 506                 if (!strcasecmp(id, ids[i]))
 507                         return true;
 508
 509         return false;
 510 }
 511
 512 /*
 513  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 514  */
 515 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 516 {
 517         struct serio *serio = psmouse->ps2dev.serio;
 518         char *p, *fw_id_copy, *save_ptr;
 519         bool found = false;
 520
 521         if (strncmp(serio->firmware_id, "PNP: ", 5))
 522                 return false;
 523
 524         fw_id_copy = kstrndup(&serio->firmware_id[5],
 525                               sizeof(serio->firmware_id) - 5,
 526                               GFP_KERNEL);
 527         if (!fw_id_copy)
 528                 return false;
 529
 530         save_ptr = fw_id_copy;
 531         while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 532                 if (psmouse_check_pnp_id(p, ids)) {
 533                         found = true;
 534                         break;
 535                 }
 536         }
 537
 538         kfree(save_ptr);
 539         return found;
 540 }
 541
 542 /*
 543  * Genius NetMouse magic init.
 544  */
 545 static int genius_detect(struct psmouse *psmouse, bool set_properties)
 546 {
 547         struct ps2dev *ps2dev = &psmouse->ps2dev;
 548         u8 param[4];
 549
 550         param[0] = 3;
 551         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 552         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 553         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 554         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 555         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 556
 557         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 558                 return -ENODEV;
 559
 560         if (set_properties) {
 561                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 562                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 563                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 564                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 565
 566                 psmouse->vendor = "Genius";
 567                 psmouse->name = "Mouse";
 568                 psmouse->pktsize = 4;
 569         }
 570
 571         return 0;
 572 }
 573
 574 /*
 575  * IntelliMouse magic init.
 576  */
 577 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 578 {
 579         struct ps2dev *ps2dev = &psmouse->ps2dev;
 580         u8 param[2];
 581
 582         param[0] = 200;
 583         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 584         param[0] = 100;
 585         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 586         param[0] =  80;
 587         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 588         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 589
 590         if (param[0] != 3)
 591                 return -ENODEV;
 592
 593         if (set_properties) {
 594                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 595                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 596
 597                 if (!psmouse->vendor)
 598                         psmouse->vendor = "Generic";
 599                 if (!psmouse->name)
 600                         psmouse->name = "Wheel Mouse";
 601                 psmouse->pktsize = 4;
 602         }
 603
 604         return 0;
 605 }
 606
 607 /*
 608  * Try IntelliMouse/Explorer magic init.
 609  */
 610 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 611 {
 612         struct ps2dev *ps2dev = &psmouse->ps2dev;
 613         u8 param[2];
 614
 615         intellimouse_detect(psmouse, 0);
 616
 617         param[0] = 200;
 618         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 619         param[0] = 200;
 620         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 621         param[0] =  80;
 622         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 623         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 624
 625         if (param[0] != 4)
 626                 return -ENODEV;
 627
 628         /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 629         param[0] = 200;
 630         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 631         param[0] =  80;
 632         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 633         param[0] =  40;
 634         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 635
 636         if (set_properties) {
 637                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 638                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 639                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
 640                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 641                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 642
 643                 if (!psmouse->vendor)
 644                         psmouse->vendor = "Generic";
 645                 if (!psmouse->name)
 646                         psmouse->name = "Explorer Mouse";
 647                 psmouse->pktsize = 4;
 648         }
 649
 650         return 0;
 651 }
 652
 653 /*
 654  * Kensington ThinkingMouse / ExpertMouse magic init.
 655  */
 656 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 657 {
 658         struct ps2dev *ps2dev = &psmouse->ps2dev;
 659         u8 param[2];
 660         static const u8 seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 661         int i;
 662
 663         param[0] = 10;
 664         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 665         param[0] = 0;
 666         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 667         for (i = 0; i < ARRAY_SIZE(seq); i++) {
 668                 param[0] = seq[i];
 669                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 670         }
 671         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 672
 673         if (param[0] != 2)
 674                 return -ENODEV;
 675
 676         if (set_properties) {
 677                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 678                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 679
 680                 psmouse->vendor = "Kensington";
 681                 psmouse->name = "ThinkingMouse";
 682         }
 683
 684         return 0;
 685 }
 686
 687 /*
 688  * Bare PS/2 protocol "detection". Always succeeds.
 689  */
 690 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 691 {
 692         if (set_properties) {
 693                 if (!psmouse->vendor)
 694                         psmouse->vendor = "Generic";
 695                 if (!psmouse->name)
 696                         psmouse->name = "Mouse";
 697
 698                 /*
 699                  * We have no way of figuring true number of buttons so let's
 700                  * assume that the device has 3.
 701                  */
 702                 input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
 703         }
 704
 705         return 0;
 706 }
 707
 708 /*
 709  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 710  * must be forced by sysfs protocol writing.
 711  */
 712 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 713 {
 714         if (set_properties) {
 715                 psmouse->vendor = "Cortron";
 716                 psmouse->name = "PS/2 Trackball";
 717
 718                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 719                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 720         }
 721
 722         return 0;
 723 }
 724
 725 static const struct psmouse_protocol psmouse_protocols[] = {
 726         {
 727                 .type           = PSMOUSE_PS2,
 728                 .name           = "PS/2",
 729                 .alias          = "bare",
 730                 .maxproto       = true,
 731                 .ignore_parity  = true,
 732                 .detect         = ps2bare_detect,
 733                 .try_passthru   = true,
 734         },
 735 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 736         {
 737                 .type           = PSMOUSE_PS2PP,
 738                 .name           = "PS2++",
 739                 .alias          = "logitech",
 740                 .detect         = ps2pp_detect,
 741         },
 742 #endif
 743         {
 744                 .type           = PSMOUSE_THINKPS,
 745                 .name           = "ThinkPS/2",
 746                 .alias          = "thinkps",
 747                 .detect         = thinking_detect,
 748         },
 749 #ifdef CONFIG_MOUSE_PS2_CYPRESS
 750         {
 751                 .type           = PSMOUSE_CYPRESS,
 752                 .name           = "CyPS/2",
 753                 .alias          = "cypress",
 754                 .detect         = cypress_detect,
 755                 .init           = cypress_init,
 756         },
 757 #endif
 758         {
 759                 .type           = PSMOUSE_GENPS,
 760                 .name           = "GenPS/2",
 761                 .alias          = "genius",
 762                 .detect         = genius_detect,
 763         },
 764         {
 765                 .type           = PSMOUSE_IMPS,
 766                 .name           = "ImPS/2",
 767                 .alias          = "imps",
 768                 .maxproto       = true,
 769                 .ignore_parity  = true,
 770                 .detect         = intellimouse_detect,
 771                 .try_passthru   = true,
 772         },
 773         {
 774                 .type           = PSMOUSE_IMEX,
 775                 .name           = "ImExPS/2",
 776                 .alias          = "exps",
 777                 .maxproto       = true,
 778                 .ignore_parity  = true,
 779                 .detect         = im_explorer_detect,
 780                 .try_passthru   = true,
 781         },
 782 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 783         {
 784                 .type           = PSMOUSE_SYNAPTICS,
 785                 .name           = "SynPS/2",
 786                 .alias          = "synaptics",
 787                 .detect         = synaptics_detect,
 788                 .init           = synaptics_init_absolute,
 789         },
 790         {
 791                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
 792                 .name           = "SynRelPS/2",
 793                 .alias          = "synaptics-relative",
 794                 .detect         = synaptics_detect,
 795                 .init           = synaptics_init_relative,
 796         },
 797 #endif
 798 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
 799         {
 800                 .type           = PSMOUSE_SYNAPTICS_SMBUS,
 801                 .name           = "SynSMBus",
 802                 .alias          = "synaptics-smbus",
 803                 .detect         = synaptics_detect,
 804                 .init           = synaptics_init_smbus,
 805                 .smbus_companion = true,
 806         },
 807 #endif
 808 #ifdef CONFIG_MOUSE_PS2_ALPS
 809         {
 810                 .type           = PSMOUSE_ALPS,
 811                 .name           = "AlpsPS/2",
 812                 .alias          = "alps",
 813                 .detect         = alps_detect,
 814                 .init           = alps_init,
 815         },
 816 #endif
 817 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 818         {
 819                 .type           = PSMOUSE_LIFEBOOK,
 820                 .name           = "LBPS/2",
 821                 .alias          = "lifebook",
 822                 .detect         = lifebook_detect,
 823                 .init           = lifebook_init,
 824         },
 825 #endif
 826 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 827         {
 828                 .type           = PSMOUSE_TRACKPOINT,
 829                 .name           = "TPPS/2",
 830                 .alias          = "trackpoint",
 831                 .detect         = trackpoint_detect,
 832                 .try_passthru   = true,
 833         },
 834 #endif
 835 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 836         {
 837                 .type           = PSMOUSE_TOUCHKIT_PS2,
 838                 .name           = "touchkitPS/2",
 839                 .alias          = "touchkit",
 840                 .detect         = touchkit_ps2_detect,
 841         },
 842 #endif
 843 #ifdef CONFIG_MOUSE_PS2_OLPC
 844         {
 845                 .type           = PSMOUSE_HGPK,
 846                 .name           = "OLPC HGPK",
 847                 .alias          = "hgpk",
 848                 .detect         = hgpk_detect,
 849         },
 850 #endif
 851 #ifdef CONFIG_MOUSE_PS2_ELANTECH
 852         {
 853                 .type           = PSMOUSE_ELANTECH,
 854                 .name           = "ETPS/2",
 855                 .alias          = "elantech",
 856                 .detect         = elantech_detect,
 857                 .init           = elantech_init_ps2,
 858         },
 859 #endif
 860 #ifdef CONFIG_MOUSE_PS2_ELANTECH_SMBUS
 861         {
 862                 .type           = PSMOUSE_ELANTECH_SMBUS,
 863                 .name           = "ETSMBus",
 864                 .alias          = "elantech-smbus",
 865                 .detect         = elantech_detect,
 866                 .init           = elantech_init_smbus,
 867                 .smbus_companion = true,
 868         },
 869 #endif
 870 #ifdef CONFIG_MOUSE_PS2_SENTELIC
 871         {
 872                 .type           = PSMOUSE_FSP,
 873                 .name           = "FSPPS/2",
 874                 .alias          = "fsp",
 875                 .detect         = fsp_detect,
 876                 .init           = fsp_init,
 877         },
 878 #endif
 879         {
 880                 .type           = PSMOUSE_CORTRON,
 881                 .name           = "CortronPS/2",
 882                 .alias          = "cortps",
 883                 .detect         = cortron_detect,
 884         },
 885 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
 886         {
 887                 .type           = PSMOUSE_FOCALTECH,
 888                 .name           = "FocalTechPS/2",
 889                 .alias          = "focaltech",
 890                 .detect         = focaltech_detect,
 891                 .init           = focaltech_init,
 892         },
 893 #endif
 894 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
 895         {
 896                 .type           = PSMOUSE_VMMOUSE,
 897                 .name           = VMMOUSE_PSNAME,
 898                 .alias          = "vmmouse",
 899                 .detect         = vmmouse_detect,
 900                 .init           = vmmouse_init,
 901         },
 902 #endif
 903 #ifdef CONFIG_MOUSE_PS2_BYD
 904         {
 905                 .type           = PSMOUSE_BYD,
 906                 .name           = "BYDPS/2",
 907                 .alias          = "byd",
 908                 .detect         = byd_detect,
 909                 .init           = byd_init,
 910         },
 911 #endif
 912         {
 913                 .type           = PSMOUSE_AUTO,
 914                 .name           = "auto",
 915                 .alias          = "any",
 916                 .maxproto       = true,
 917         },
 918 };
 919
 920 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 921 {
 922         int i;
 923
 924         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 925                 if (psmouse_protocols[i].type == type)
 926                         return &psmouse_protocols[i];
 927
 928         return NULL;
 929 }
 930
 931 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 932 {
 933         const struct psmouse_protocol *proto;
 934
 935         proto = __psmouse_protocol_by_type(type);
 936         if (proto)
 937                 return proto;
 938
 939         WARN_ON(1);
 940         return &psmouse_protocols[0];
 941 }
 942
 943 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 944 {
 945         const struct psmouse_protocol *p;
 946         int i;
 947
 948         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 949                 p = &psmouse_protocols[i];
 950
 951                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 952                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 953                         return &psmouse_protocols[i];
 954         }
 955
 956         return NULL;
 957 }
 958
 959 /*
 960  * Apply default settings to the psmouse structure. Most of them will
 961  * be overridden by individual protocol initialization routines.
 962  */
 963 static void psmouse_apply_defaults(struct psmouse *psmouse)
 964 {
 965         struct input_dev *input_dev = psmouse->dev;
 966
 967         bitmap_zero(input_dev->evbit, EV_CNT);
 968         bitmap_zero(input_dev->keybit, KEY_CNT);
 969         bitmap_zero(input_dev->relbit, REL_CNT);
 970         bitmap_zero(input_dev->absbit, ABS_CNT);
 971         bitmap_zero(input_dev->mscbit, MSC_CNT);
 972
 973         input_set_capability(input_dev, EV_KEY, BTN_LEFT);
 974         input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
 975
 976         input_set_capability(input_dev, EV_REL, REL_X);
 977         input_set_capability(input_dev, EV_REL, REL_Y);
 978
 979         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 980
 981         psmouse->protocol = &psmouse_protocols[0];
 982
 983         psmouse->set_rate = psmouse_set_rate;
 984         psmouse->set_resolution = psmouse_set_resolution;
 985         psmouse->set_scale = psmouse_set_scale;
 986         psmouse->poll = psmouse_poll;
 987         psmouse->protocol_handler = psmouse_process_byte;
 988         psmouse->pktsize = 3;
 989         psmouse->reconnect = NULL;
 990         psmouse->fast_reconnect = NULL;
 991         psmouse->disconnect = NULL;
 992         psmouse->cleanup = NULL;
 993         psmouse->pt_activate = NULL;
 994         psmouse->pt_deactivate = NULL;
 995 }
 996
 997 static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
 998                               struct psmouse *psmouse, bool allow_passthrough,
 999                               bool set_properties)
1000 {
1001         if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
1002             !allow_passthrough) {
1003                 return false;
1004         }
1005
1006         if (set_properties)
1007                 psmouse_apply_defaults(psmouse);
1008
1009         return detect(psmouse, set_properties) == 0;
1010 }
1011
1012 static bool psmouse_try_protocol(struct psmouse *psmouse,
1013                                  enum psmouse_type type,
1014                                  unsigned int *max_proto,
1015                                  bool set_properties, bool init_allowed)
1016 {
1017         const struct psmouse_protocol *proto;
1018
1019         proto = __psmouse_protocol_by_type(type);
1020         if (!proto)
1021                 return false;
1022
1023         if (!psmouse_do_detect(proto->detect, psmouse, proto->try_passthru,
1024                                set_properties))
1025                 return false;
1026
1027         if (set_properties && proto->init && init_allowed) {
1028                 if (proto->init(psmouse) != 0) {
1029                         /*
1030                          * We detected device, but init failed. Adjust
1031                          * max_proto so we only try standard protocols.
1032                          */
1033                         if (*max_proto > PSMOUSE_IMEX)
1034                                 *max_proto = PSMOUSE_IMEX;
1035
1036                         return false;
1037                 }
1038         }
1039
1040         return true;
1041 }
1042
1043 /*
1044  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
1045  * the mouse may have.
1046  */
1047 static int psmouse_extensions(struct psmouse *psmouse,
1048                               unsigned int max_proto, bool set_properties)
1049 {
1050         bool synaptics_hardware = false;
1051         int ret;
1052
1053         /*
1054          * Always check for focaltech, this is safe as it uses pnp-id
1055          * matching.
1056          */
1057         if (psmouse_do_detect(focaltech_detect,
1058                               psmouse, false, set_properties)) {
1059                 if (max_proto > PSMOUSE_IMEX &&
1060                     IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
1061                     (!set_properties || focaltech_init(psmouse) == 0)) {
1062                         return PSMOUSE_FOCALTECH;
1063                 }
1064                 /*
1065                  * Restrict psmouse_max_proto so that psmouse_initialize()
1066                  * does not try to reset rate and resolution, because even
1067                  * that upsets the device.
1068                  * This also causes us to basically fall through to basic
1069                  * protocol detection, where we fully reset the mouse,
1070                  * and set it up as bare PS/2 protocol device.
1071                  */
1072                 psmouse_max_proto = max_proto = PSMOUSE_PS2;
1073         }
1074
1075         /*
1076          * We always check for LifeBook because it does not disturb mouse
1077          * (it only checks DMI information).
1078          */
1079         if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1080                                  set_properties, max_proto > PSMOUSE_IMEX))
1081                 return PSMOUSE_LIFEBOOK;
1082
1083         if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1084                                  set_properties, max_proto > PSMOUSE_IMEX))
1085                 return PSMOUSE_VMMOUSE;
1086
1087         /*
1088          * Try Kensington ThinkingMouse (we try first, because Synaptics
1089          * probe upsets the ThinkingMouse).
1090          */
1091         if (max_proto > PSMOUSE_IMEX &&
1092             psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1093                                  set_properties, true)) {
1094                 return PSMOUSE_THINKPS;
1095         }
1096
1097         /*
1098          * Try Synaptics TouchPad. Note that probing is done even if
1099          * Synaptics protocol support is disabled in config - we need to
1100          * know if it is Synaptics so we can reset it properly after
1101          * probing for IntelliMouse.
1102          */
1103         if (max_proto > PSMOUSE_PS2 &&
1104             psmouse_do_detect(synaptics_detect,
1105                               psmouse, false, set_properties)) {
1106                 synaptics_hardware = true;
1107
1108                 if (max_proto > PSMOUSE_IMEX) {
1109                         /*
1110                          * Try activating protocol, but check if support is
1111                          * enabled first, since we try detecting Synaptics
1112                          * even when protocol is disabled.
1113                          */
1114                         if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
1115                             IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
1116                                 if (!set_properties)
1117                                         return PSMOUSE_SYNAPTICS;
1118
1119                                 ret = synaptics_init(psmouse);
1120                                 if (ret >= 0)
1121                                         return ret;
1122                         }
1123
1124                         /*
1125                          * Some Synaptics touchpads can emulate extended
1126                          * protocols (like IMPS/2).  Unfortunately
1127                          * Logitech/Genius probes confuse some firmware
1128                          * versions so we'll have to skip them.
1129                          */
1130                         max_proto = PSMOUSE_IMEX;
1131                 }
1132
1133                 /*
1134                  * Make sure that touchpad is in relative mode, gestures
1135                  * (taps) are enabled.
1136                  */
1137                 synaptics_reset(psmouse);
1138         }
1139
1140         /*
1141          * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1142          * because Finger Sensing Pad probe upsets some modules of Cypress
1143          * Trackpads.
1144          */
1145         if (max_proto > PSMOUSE_IMEX &&
1146             psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1147                                  set_properties, true)) {
1148                 return PSMOUSE_CYPRESS;
1149         }
1150
1151         /* Try ALPS TouchPad */
1152         if (max_proto > PSMOUSE_IMEX) {
1153                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1154                 if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1155                                          &max_proto, set_properties, true))
1156                         return PSMOUSE_ALPS;
1157         }
1158
1159         /* Try OLPC HGPK touchpad */
1160         if (max_proto > PSMOUSE_IMEX &&
1161             psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1162                                  set_properties, true)) {
1163                 return PSMOUSE_HGPK;
1164         }
1165
1166         /* Try Elantech touchpad */
1167         if (max_proto > PSMOUSE_IMEX &&
1168             psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1169                                  &max_proto, set_properties, false)) {
1170                 if (!set_properties)
1171                         return PSMOUSE_ELANTECH;
1172
1173                 ret = elantech_init(psmouse);
1174                 if (ret >= 0)
1175                         return ret;
1176         }
1177
1178         if (max_proto > PSMOUSE_IMEX) {
1179                 if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1180                                          &max_proto, set_properties, true))
1181                         return PSMOUSE_GENPS;
1182
1183                 if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1184                                          &max_proto, set_properties, true))
1185                         return PSMOUSE_PS2PP;
1186
1187                 if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1188                                          &max_proto, set_properties, true))
1189                         return PSMOUSE_TRACKPOINT;
1190
1191                 if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1192                                          &max_proto, set_properties, true))
1193                         return PSMOUSE_TOUCHKIT_PS2;
1194         }
1195
1196         /*
1197          * Try Finger Sensing Pad. We do it here because its probe upsets
1198          * Trackpoint devices (causing TP_READ_ID command to time out).
1199          */
1200         if (max_proto > PSMOUSE_IMEX &&
1201             psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1202                                  &max_proto, set_properties, true)) {
1203                 return PSMOUSE_FSP;
1204         }
1205
1206         /*
1207          * Reset to defaults in case the device got confused by extended
1208          * protocol probes. Note that we follow up with full reset because
1209          * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1210          */
1211         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1212         psmouse_reset(psmouse);
1213
1214         if (max_proto >= PSMOUSE_IMEX &&
1215             psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1216                                  &max_proto, set_properties, true)) {
1217                 return PSMOUSE_IMEX;
1218         }
1219
1220         if (max_proto >= PSMOUSE_IMPS &&
1221             psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1222                                  &max_proto, set_properties, true)) {
1223                 return PSMOUSE_IMPS;
1224         }
1225
1226         /*
1227          * Okay, all failed, we have a standard mouse here. The number of
1228          * the buttons is still a question, though. We assume 3.
1229          */
1230         psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1231                              &max_proto, set_properties, true);
1232
1233         if (synaptics_hardware) {
1234                 /*
1235                  * We detected Synaptics hardware but it did not respond to
1236                  * IMPS/2 probes.  We need to reset the touchpad because if
1237                  * there is a track point on the pass through port it could
1238                  * get disabled while probing for protocol extensions.
1239                  */
1240                 psmouse_reset(psmouse);
1241         }
1242
1243         return PSMOUSE_PS2;
1244 }
1245
1246 /*
1247  * psmouse_probe() probes for a PS/2 mouse.
1248  */
1249 static int psmouse_probe(struct psmouse *psmouse)
1250 {
1251         struct ps2dev *ps2dev = &psmouse->ps2dev;
1252         u8 param[2];
1253         int error;
1254
1255         /*
1256          * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1257          * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1258          * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1259          * subsequent ID queries, probably due to a firmware bug.
1260          */
1261         param[0] = 0xa5;
1262         error = ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
1263         if (error)
1264                 return error;
1265
1266         if (param[0] != 0x00 && param[0] != 0x03 &&
1267             param[0] != 0x04 && param[0] != 0xff)
1268                 return -ENODEV;
1269
1270         /*
1271          * Then we reset and disable the mouse so that it doesn't generate
1272          * events.
1273          */
1274         error = ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1275         if (error)
1276                 psmouse_warn(psmouse, "Failed to reset mouse on %s: %d\n",
1277                              ps2dev->serio->phys, error);
1278
1279         return 0;
1280 }
1281
1282 /*
1283  * psmouse_initialize() initializes the mouse to a sane state.
1284  */
1285 static void psmouse_initialize(struct psmouse *psmouse)
1286 {
1287         /*
1288          * We set the mouse report rate, resolution and scaling.
1289          */
1290         if (psmouse_max_proto != PSMOUSE_PS2) {
1291                 psmouse->set_rate(psmouse, psmouse->rate);
1292                 psmouse->set_resolution(psmouse, psmouse->resolution);
1293                 psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1294         }
1295 }
1296
1297 /*
1298  * psmouse_activate() enables the mouse so that we get motion reports from it.
1299  */
1300 int psmouse_activate(struct psmouse *psmouse)
1301 {
1302         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1303                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1304                              psmouse->ps2dev.serio->phys);
1305                 return -1;
1306         }
1307
1308         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1309         return 0;
1310 }
1311
1312 /*
1313  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1314  * motion reports from it unless we explicitly request it.
1315  */
1316 int psmouse_deactivate(struct psmouse *psmouse)
1317 {
1318         int error;
1319
1320         error = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
1321         if (error) {
1322                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n",
1323                              psmouse->ps2dev.serio->phys, error);
1324                 return error;
1325         }
1326
1327         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1328         return 0;
1329 }
1330
1331 /*
1332  * psmouse_resync() attempts to re-validate current protocol.
1333  */
1334 static void psmouse_resync(struct work_struct *work)
1335 {
1336         struct psmouse *parent = NULL, *psmouse =
1337                 container_of(work, struct psmouse, resync_work.work);
1338         struct serio *serio = psmouse->ps2dev.serio;
1339         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1340         bool failed = false, enabled = false;
1341         int i;
1342
1343         mutex_lock(&psmouse_mutex);
1344
1345         if (psmouse->state != PSMOUSE_RESYNCING)
1346                 goto out;
1347
1348         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1349                 parent = serio_get_drvdata(serio->parent);
1350                 psmouse_deactivate(parent);
1351         }
1352
1353         /*
1354          * Some mice don't ACK commands sent while they are in the middle of
1355          * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1356          * instead of ps2_command() which would wait for 200ms for an ACK
1357          * that may never come.
1358          * As an additional quirk ALPS touchpads may not only forget to ACK
1359          * disable command but will stop reporting taps, so if we see that
1360          * mouse at least once ACKs disable we will do full reconnect if ACK
1361          * is missing.
1362          */
1363         psmouse->num_resyncs++;
1364
1365         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1366                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1367                         failed = true;
1368         } else
1369                 psmouse->acks_disable_command = true;
1370
1371         /*
1372          * Poll the mouse. If it was reset the packet will be shorter than
1373          * psmouse->pktsize and ps2_command will fail. We do not expect and
1374          * do not handle scenario when mouse "upgrades" its protocol while
1375          * disconnected since it would require additional delay. If we ever
1376          * see a mouse that does it we'll adjust the code.
1377          */
1378         if (!failed) {
1379                 if (psmouse->poll(psmouse))
1380                         failed = true;
1381                 else {
1382                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1383                         for (i = 0; i < psmouse->pktsize; i++) {
1384                                 psmouse->pktcnt++;
1385                                 rc = psmouse->protocol_handler(psmouse);
1386                                 if (rc != PSMOUSE_GOOD_DATA)
1387                                         break;
1388                         }
1389                         if (rc != PSMOUSE_FULL_PACKET)
1390                                 failed = true;
1391                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1392                 }
1393         }
1394
1395         /*
1396          * Now try to enable mouse. We try to do that even if poll failed
1397          * and also repeat our attempts 5 times, otherwise we may be left
1398          * out with disabled mouse.
1399          */
1400         for (i = 0; i < 5; i++) {
1401                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1402                         enabled = true;
1403                         break;
1404                 }
1405                 msleep(200);
1406         }
1407
1408         if (!enabled) {
1409                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1410                              psmouse->ps2dev.serio->phys);
1411                 failed = true;
1412         }
1413
1414         if (failed) {
1415                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1416                 psmouse_info(psmouse,
1417                              "resync failed, issuing reconnect request\n");
1418                 serio_reconnect(serio);
1419         } else
1420                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1421
1422         if (parent)
1423                 psmouse_activate(parent);
1424  out:
1425         mutex_unlock(&psmouse_mutex);
1426 }
1427
1428 /*
1429  * psmouse_cleanup() resets the mouse into power-on state.
1430  */
1431 static void psmouse_cleanup(struct serio *serio)
1432 {
1433         struct psmouse *psmouse = serio_get_drvdata(serio);
1434         struct psmouse *parent = NULL;
1435
1436         mutex_lock(&psmouse_mutex);
1437
1438         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1439                 parent = serio_get_drvdata(serio->parent);
1440                 psmouse_deactivate(parent);
1441         }
1442
1443         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1444
1445         /*
1446          * Disable stream mode so cleanup routine can proceed undisturbed.
1447          */
1448         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1449                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1450                              psmouse->ps2dev.serio->phys);
1451
1452         if (psmouse->cleanup)
1453                 psmouse->cleanup(psmouse);
1454
1455         /*
1456          * Reset the mouse to defaults (bare PS/2 protocol).
1457          */
1458         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1459
1460         /*
1461          * Some boxes, such as HP nx7400, get terribly confused if mouse
1462          * is not fully enabled before suspending/shutting down.
1463          */
1464         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1465
1466         if (parent) {
1467                 if (parent->pt_deactivate)
1468                         parent->pt_deactivate(parent);
1469
1470                 psmouse_activate(parent);
1471         }
1472
1473         mutex_unlock(&psmouse_mutex);
1474 }
1475
1476 /*
1477  * psmouse_disconnect() closes and frees.
1478  */
1479 static void psmouse_disconnect(struct serio *serio)
1480 {
1481         struct psmouse *psmouse = serio_get_drvdata(serio);
1482         struct psmouse *parent = NULL;
1483
1484         sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1485
1486         mutex_lock(&psmouse_mutex);
1487
1488         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1489
1490         /* make sure we don't have a resync in progress */
1491         mutex_unlock(&psmouse_mutex);
1492         flush_workqueue(kpsmoused_wq);
1493         mutex_lock(&psmouse_mutex);
1494
1495         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1496                 parent = serio_get_drvdata(serio->parent);
1497                 psmouse_deactivate(parent);
1498         }
1499
1500         if (psmouse->disconnect)
1501                 psmouse->disconnect(psmouse);
1502
1503         if (parent && parent->pt_deactivate)
1504                 parent->pt_deactivate(parent);
1505
1506         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1507
1508         serio_close(serio);
1509         serio_set_drvdata(serio, NULL);
1510
1511         if (psmouse->dev)
1512                 input_unregister_device(psmouse->dev);
1513
1514         kfree(psmouse);
1515
1516         if (parent)
1517                 psmouse_activate(parent);
1518
1519         mutex_unlock(&psmouse_mutex);
1520 }
1521
1522 static int psmouse_switch_protocol(struct psmouse *psmouse,
1523                                    const struct psmouse_protocol *proto)
1524 {
1525         const struct psmouse_protocol *selected_proto;
1526         struct input_dev *input_dev = psmouse->dev;
1527         enum psmouse_type type;
1528
1529         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1530
1531         if (proto && (proto->detect || proto->init)) {
1532                 psmouse_apply_defaults(psmouse);
1533
1534                 if (proto->detect && proto->detect(psmouse, true) < 0)
1535                         return -1;
1536
1537                 if (proto->init && proto->init(psmouse) < 0)
1538                         return -1;
1539
1540                 selected_proto = proto;
1541         } else {
1542                 type = psmouse_extensions(psmouse, psmouse_max_proto, true);
1543                 selected_proto = psmouse_protocol_by_type(type);
1544         }
1545
1546         psmouse->protocol = selected_proto;
1547
1548         /*
1549          * If mouse's packet size is 3 there is no point in polling the
1550          * device in hopes to detect protocol reset - we won't get less
1551          * than 3 bytes response anyhow.
1552          */
1553         if (psmouse->pktsize == 3)
1554                 psmouse->resync_time = 0;
1555
1556         /*
1557          * Some smart KVMs fake response to POLL command returning just
1558          * 3 bytes and messing up our resync logic, so if initial poll
1559          * fails we won't try polling the device anymore. Hopefully
1560          * such KVM will maintain initially selected protocol.
1561          */
1562         if (psmouse->resync_time && psmouse->poll(psmouse))
1563                 psmouse->resync_time = 0;
1564
1565         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1566                  selected_proto->name, psmouse->vendor, psmouse->name);
1567
1568         input_dev->name = psmouse->devname;
1569         input_dev->phys = psmouse->phys;
1570         input_dev->id.bustype = BUS_I8042;
1571         input_dev->id.vendor = 0x0002;
1572         input_dev->id.product = psmouse->protocol->type;
1573         input_dev->id.version = psmouse->model;
1574
1575         return 0;
1576 }
1577
1578 /*
1579  * psmouse_connect() is a callback from the serio module when
1580  * an unhandled serio port is found.
1581  */
1582 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1583 {
1584         struct psmouse *psmouse, *parent = NULL;
1585         struct input_dev *input_dev;
1586         int retval = 0, error = -ENOMEM;
1587
1588         mutex_lock(&psmouse_mutex);
1589
1590         /*
1591          * If this is a pass-through port deactivate parent so the device
1592          * connected to this port can be successfully identified
1593          */
1594         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1595                 parent = serio_get_drvdata(serio->parent);
1596                 psmouse_deactivate(parent);
1597         }
1598
1599         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1600         input_dev = input_allocate_device();
1601         if (!psmouse || !input_dev)
1602                 goto err_free;
1603
1604         ps2_init(&psmouse->ps2dev, serio);
1605         INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1606         psmouse->dev = input_dev;
1607         snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1608
1609         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1610
1611         serio_set_drvdata(serio, psmouse);
1612
1613         error = serio_open(serio, drv);
1614         if (error)
1615                 goto err_clear_drvdata;
1616
1617         /* give PT device some time to settle down before probing */
1618         if (serio->id.type == SERIO_PS_PSTHRU)
1619                 usleep_range(10000, 15000);
1620
1621         if (psmouse_probe(psmouse) < 0) {
1622                 error = -ENODEV;
1623                 goto err_close_serio;
1624         }
1625
1626         psmouse->rate = psmouse_rate;
1627         psmouse->resolution = psmouse_resolution;
1628         psmouse->resetafter = psmouse_resetafter;
1629         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1630         psmouse->smartscroll = psmouse_smartscroll;
1631
1632         psmouse_switch_protocol(psmouse, NULL);
1633
1634         if (!psmouse->protocol->smbus_companion) {
1635                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1636                 psmouse_initialize(psmouse);
1637
1638                 error = input_register_device(input_dev);
1639                 if (error)
1640                         goto err_protocol_disconnect;
1641         } else {
1642                 /* Smbus companion will be reporting events, not us. */
1643                 input_free_device(input_dev);
1644                 psmouse->dev = input_dev = NULL;
1645         }
1646
1647         if (parent && parent->pt_activate)
1648                 parent->pt_activate(parent);
1649
1650         error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1651         if (error)
1652                 goto err_pt_deactivate;
1653
1654         /*
1655          * PS/2 devices having SMBus companions should stay disabled
1656          * on PS/2 side, in order to have SMBus part operable.
1657          */
1658         if (!psmouse->protocol->smbus_companion)
1659                 psmouse_activate(psmouse);
1660
1661  out:
1662         /* If this is a pass-through port the parent needs to be re-activated */
1663         if (parent)
1664                 psmouse_activate(parent);
1665
1666         mutex_unlock(&psmouse_mutex);
1667         return retval;
1668
1669  err_pt_deactivate:
1670         if (parent && parent->pt_deactivate)
1671                 parent->pt_deactivate(parent);
1672         if (input_dev) {
1673                 input_unregister_device(input_dev);
1674                 input_dev = NULL; /* so we don't try to free it below */
1675         }
1676  err_protocol_disconnect:
1677         if (psmouse->disconnect)
1678                 psmouse->disconnect(psmouse);
1679         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1680  err_close_serio:
1681         serio_close(serio);
1682  err_clear_drvdata:
1683         serio_set_drvdata(serio, NULL);
1684  err_free:
1685         input_free_device(input_dev);
1686         kfree(psmouse);
1687
1688         retval = error;
1689         goto out;
1690 }
1691
1692 static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
1693 {
1694         struct psmouse *psmouse = serio_get_drvdata(serio);
1695         struct psmouse *parent = NULL;
1696         int (*reconnect_handler)(struct psmouse *);
1697         enum psmouse_type type;
1698         int rc = -1;
1699
1700         mutex_lock(&psmouse_mutex);
1701
1702         if (fast_reconnect) {
1703                 reconnect_handler = psmouse->fast_reconnect;
1704                 if (!reconnect_handler) {
1705                         rc = -ENOENT;
1706                         goto out_unlock;
1707                 }
1708         } else {
1709                 reconnect_handler = psmouse->reconnect;
1710         }
1711
1712         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1713                 parent = serio_get_drvdata(serio->parent);
1714                 psmouse_deactivate(parent);
1715         }
1716
1717         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1718
1719         if (reconnect_handler) {
1720                 if (reconnect_handler(psmouse))
1721                         goto out;
1722         } else {
1723                 psmouse_reset(psmouse);
1724
1725                 if (psmouse_probe(psmouse) < 0)
1726                         goto out;
1727
1728                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1729                 if (psmouse->protocol->type != type)
1730                         goto out;
1731         }
1732
1733         /*
1734          * OK, the device type (and capabilities) match the old one,
1735          * we can continue using it, complete initialization
1736          */
1737         if (!psmouse->protocol->smbus_companion) {
1738                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1739                 psmouse_initialize(psmouse);
1740         }
1741
1742         if (parent && parent->pt_activate)
1743                 parent->pt_activate(parent);
1744
1745         /*
1746          * PS/2 devices having SMBus companions should stay disabled
1747          * on PS/2 side, in order to have SMBus part operable.
1748          */
1749         if (!psmouse->protocol->smbus_companion)
1750                 psmouse_activate(psmouse);
1751
1752         rc = 0;
1753
1754 out:
1755         /* If this is a pass-through port the parent waits to be activated */
1756         if (parent)
1757                 psmouse_activate(parent);
1758
1759 out_unlock:
1760         mutex_unlock(&psmouse_mutex);
1761         return rc;
1762 }
1763
1764 static int psmouse_reconnect(struct serio *serio)
1765 {
1766         return __psmouse_reconnect(serio, false);
1767 }
1768
1769 static int psmouse_fast_reconnect(struct serio *serio)
1770 {
1771         return __psmouse_reconnect(serio, true);
1772 }
1773
1774 static struct serio_device_id psmouse_serio_ids[] = {
1775         {
1776                 .type   = SERIO_8042,
1777                 .proto  = SERIO_ANY,
1778                 .id     = SERIO_ANY,
1779                 .extra  = SERIO_ANY,
1780         },
1781         {
1782                 .type   = SERIO_PS_PSTHRU,
1783                 .proto  = SERIO_ANY,
1784                 .id     = SERIO_ANY,
1785                 .extra  = SERIO_ANY,
1786         },
1787         { 0 }
1788 };
1789
1790 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1791
1792 static struct serio_driver psmouse_drv = {
1793         .driver         = {
1794                 .name   = "psmouse",
1795         },
1796         .description    = DRIVER_DESC,
1797         .id_table       = psmouse_serio_ids,
1798         .interrupt      = psmouse_interrupt,
1799         .connect        = psmouse_connect,
1800         .reconnect      = psmouse_reconnect,
1801         .fast_reconnect = psmouse_fast_reconnect,
1802         .disconnect     = psmouse_disconnect,
1803         .cleanup        = psmouse_cleanup,
1804 };
1805
1806 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1807                                  char *buf)
1808 {
1809         struct serio *serio = to_serio_port(dev);
1810         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1811         struct psmouse *psmouse = serio_get_drvdata(serio);
1812
1813         if (psmouse->protocol->smbus_companion &&
1814                         devattr != &psmouse_attr_protocol.dattr)
1815                 return -ENOENT;
1816
1817         return attr->show(psmouse, attr->data, buf);
1818 }
1819
1820 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1821                                 const char *buf, size_t count)
1822 {
1823         struct serio *serio = to_serio_port(dev);
1824         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1825         struct psmouse *psmouse, *parent = NULL;
1826         int retval;
1827
1828         retval = mutex_lock_interruptible(&psmouse_mutex);
1829         if (retval)
1830                 goto out;
1831
1832         psmouse = serio_get_drvdata(serio);
1833
1834         if (psmouse->protocol->smbus_companion &&
1835                         devattr != &psmouse_attr_protocol.dattr) {
1836                 retval = -ENOENT;
1837                 goto out_unlock;
1838         }
1839
1840         if (attr->protect) {
1841                 if (psmouse->state == PSMOUSE_IGNORE) {
1842                         retval = -ENODEV;
1843                         goto out_unlock;
1844                 }
1845
1846                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1847                         parent = serio_get_drvdata(serio->parent);
1848                         psmouse_deactivate(parent);
1849                 }
1850
1851                 if (!psmouse->protocol->smbus_companion)
1852                         psmouse_deactivate(psmouse);
1853         }
1854
1855         retval = attr->set(psmouse, attr->data, buf, count);
1856
1857         if (attr->protect) {
1858                 if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
1859                         psmouse_activate(psmouse);
1860
1861                 if (parent)
1862                         psmouse_activate(parent);
1863         }
1864
1865  out_unlock:
1866         mutex_unlock(&psmouse_mutex);
1867  out:
1868         return retval;
1869 }
1870
1871 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1872 {
1873         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1874
1875         return sprintf(buf, "%u\n", *field);
1876 }
1877
1878 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1879 {
1880         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1881         unsigned int value;
1882         int err;
1883
1884         err = kstrtouint(buf, 10, &value);
1885         if (err)
1886                 return err;
1887
1888         *field = value;
1889
1890         return count;
1891 }
1892
1893 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1894 {
1895         return sprintf(buf, "%s\n", psmouse->protocol->name);
1896 }
1897
1898 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1899 {
1900         struct serio *serio = psmouse->ps2dev.serio;
1901         struct psmouse *parent = NULL;
1902         struct input_dev *old_dev, *new_dev;
1903         const struct psmouse_protocol *proto, *old_proto;
1904         int error;
1905         int retry = 0;
1906
1907         proto = psmouse_protocol_by_name(buf, count);
1908         if (!proto)
1909                 return -EINVAL;
1910
1911         if (psmouse->protocol == proto)
1912                 return count;
1913
1914         new_dev = input_allocate_device();
1915         if (!new_dev)
1916                 return -ENOMEM;
1917
1918         while (!list_empty(&serio->children)) {
1919                 if (++retry > 3) {
1920                         psmouse_warn(psmouse,
1921                                      "failed to destroy children ports, protocol change aborted.\n");
1922                         input_free_device(new_dev);
1923                         return -EIO;
1924                 }
1925
1926                 mutex_unlock(&psmouse_mutex);
1927                 serio_unregister_child_port(serio);
1928                 mutex_lock(&psmouse_mutex);
1929
1930                 if (serio->drv != &psmouse_drv) {
1931                         input_free_device(new_dev);
1932                         return -ENODEV;
1933                 }
1934
1935                 if (psmouse->protocol == proto) {
1936                         input_free_device(new_dev);
1937                         return count; /* switched by other thread */
1938                 }
1939         }
1940
1941         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1942                 parent = serio_get_drvdata(serio->parent);
1943                 if (parent->pt_deactivate)
1944                         parent->pt_deactivate(parent);
1945         }
1946
1947         old_dev = psmouse->dev;
1948         old_proto = psmouse->protocol;
1949
1950         if (psmouse->disconnect)
1951                 psmouse->disconnect(psmouse);
1952
1953         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1954
1955         psmouse->dev = new_dev;
1956         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1957
1958         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1959                 psmouse_reset(psmouse);
1960                 /* default to PSMOUSE_PS2 */
1961                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1962         }
1963
1964         psmouse_initialize(psmouse);
1965         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1966
1967         if (psmouse->protocol->smbus_companion) {
1968                 input_free_device(psmouse->dev);
1969                 psmouse->dev = NULL;
1970         } else {
1971                 error = input_register_device(psmouse->dev);
1972                 if (error) {
1973                         if (psmouse->disconnect)
1974                                 psmouse->disconnect(psmouse);
1975
1976                         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1977                         input_free_device(new_dev);
1978                         psmouse->dev = old_dev;
1979                         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1980                         psmouse_switch_protocol(psmouse, old_proto);
1981                         psmouse_initialize(psmouse);
1982                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1983
1984                         return error;
1985                 }
1986         }
1987
1988         if (old_dev)
1989                 input_unregister_device(old_dev);
1990
1991         if (parent && parent->pt_activate)
1992                 parent->pt_activate(parent);
1993
1994         return count;
1995 }
1996
1997 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1998 {
1999         unsigned int value;
2000         int err;
2001
2002         err = kstrtouint(buf, 10, &value);
2003         if (err)
2004                 return err;
2005
2006         psmouse->set_rate(psmouse, value);
2007         return count;
2008 }
2009
2010 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
2011 {
2012         unsigned int value;
2013         int err;
2014
2015         err = kstrtouint(buf, 10, &value);
2016         if (err)
2017                 return err;
2018
2019         psmouse->set_resolution(psmouse, value);
2020         return count;
2021 }
2022
2023
2024 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
2025 {
2026         const struct psmouse_protocol *proto;
2027
2028         if (!val)
2029                 return -EINVAL;
2030
2031         proto = psmouse_protocol_by_name(val, strlen(val));
2032
2033         if (!proto || !proto->maxproto)
2034                 return -EINVAL;
2035
2036         *((unsigned int *)kp->arg) = proto->type;
2037
2038         return 0;
2039 }
2040
2041 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
2042 {
2043         int type = *((unsigned int *)kp->arg);
2044
2045         return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
2046 }
2047
2048 static int __init psmouse_init(void)
2049 {
2050         int err;
2051
2052         lifebook_module_init();
2053         synaptics_module_init();
2054         hgpk_module_init();
2055
2056         err = psmouse_smbus_module_init();
2057         if (err)
2058                 return err;
2059
2060         kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
2061         if (!kpsmoused_wq) {
2062                 pr_err("failed to create kpsmoused workqueue\n");
2063                 err = -ENOMEM;
2064                 goto err_smbus_exit;
2065         }
2066
2067         err = serio_register_driver(&psmouse_drv);
2068         if (err)
2069                 goto err_destroy_wq;
2070
2071         return 0;
2072
2073 err_destroy_wq:
2074         destroy_workqueue(kpsmoused_wq);
2075 err_smbus_exit:
2076         psmouse_smbus_module_exit();
2077         return err;
2078 }
2079
2080 static void __exit psmouse_exit(void)
2081 {
2082         serio_unregister_driver(&psmouse_drv);
2083         destroy_workqueue(kpsmoused_wq);
2084         psmouse_smbus_module_exit();
2085 }
2086
2087 module_init(psmouse_init);
2088 module_exit(psmouse_exit);