drivers/input/mouse/psmouse-base.c

   1 /*
   2  * PS/2 mouse driver
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  * Copyright (c) 2003-2004 Dmitry Torokhov
   6  */
   7
   8 /*
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published by
  11  * the Free Software Foundation.
  12  */
  13
  14 #define pr_fmt(fmt)             KBUILD_MODNAME ": " fmt
  15 #define psmouse_fmt(fmt)        fmt
  16
  17 #include <linux/delay.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/input.h>
  22 #include <linux/serio.h>
  23 #include <linux/init.h>
  24 #include <linux/libps2.h>
  25 #include <linux/mutex.h>
  26
  27 #include "psmouse.h"
  28 #include "synaptics.h"
  29 #include "logips2pp.h"
  30 #include "alps.h"
  31 #include "hgpk.h"
  32 #include "lifebook.h"
  33 #include "trackpoint.h"
  34 #include "touchkit_ps2.h"
  35 #include "elantech.h"
  36 #include "sentelic.h"
  37 #include "cypress_ps2.h"
  38 #include "focaltech.h"
  39 #include "vmmouse.h"
  40 #include "byd.h"
  41
  42 #define DRIVER_DESC     "PS/2 mouse driver"
  43
  44 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  45 MODULE_DESCRIPTION(DRIVER_DESC);
  46 MODULE_LICENSE("GPL");
  47
  48 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
  49 static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
  50 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
  51 static const struct kernel_param_ops param_ops_proto_abbrev = {
  52         .set = psmouse_set_maxproto,
  53         .get = psmouse_get_maxproto,
  54 };
  55 #define param_check_proto_abbrev(name, p)       __param_check(name, p, unsigned int)
  56 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
  57 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
  58
  59 static unsigned int psmouse_resolution = 200;
  60 module_param_named(resolution, psmouse_resolution, uint, 0644);
  61 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
  62
  63 static unsigned int psmouse_rate = 100;
  64 module_param_named(rate, psmouse_rate, uint, 0644);
  65 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
  66
  67 static bool psmouse_smartscroll = true;
  68 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
  69 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
  70
  71 static unsigned int psmouse_resetafter = 5;
  72 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
  73 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
  74
  75 static unsigned int psmouse_resync_time;
  76 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
  77 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
  78
  79 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
  80                         NULL,
  81                         psmouse_attr_show_protocol, psmouse_attr_set_protocol);
  82 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
  83                         (void *) offsetof(struct psmouse, rate),
  84                         psmouse_show_int_attr, psmouse_attr_set_rate);
  85 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
  86                         (void *) offsetof(struct psmouse, resolution),
  87                         psmouse_show_int_attr, psmouse_attr_set_resolution);
  88 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
  89                         (void *) offsetof(struct psmouse, resetafter),
  90                         psmouse_show_int_attr, psmouse_set_int_attr);
  91 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
  92                         (void *) offsetof(struct psmouse, resync_time),
  93                         psmouse_show_int_attr, psmouse_set_int_attr);
  94
  95 static struct attribute *psmouse_attributes[] = {
  96         &psmouse_attr_protocol.dattr.attr,
  97         &psmouse_attr_rate.dattr.attr,
  98         &psmouse_attr_resolution.dattr.attr,
  99         &psmouse_attr_resetafter.dattr.attr,
 100         &psmouse_attr_resync_time.dattr.attr,
 101         NULL
 102 };
 103
 104 static struct attribute_group psmouse_attribute_group = {
 105         .attrs  = psmouse_attributes,
 106 };
 107
 108 /*
 109  * psmouse_mutex protects all operations changing state of mouse
 110  * (connecting, disconnecting, changing rate or resolution via
 111  * sysfs). We could use a per-device semaphore but since there
 112  * rarely more than one PS/2 mouse connected and since semaphore
 113  * is taken in "slow" paths it is not worth it.
 114  */
 115 static DEFINE_MUTEX(psmouse_mutex);
 116
 117 static struct workqueue_struct *kpsmoused_wq;
 118
 119 struct psmouse_protocol {
 120         enum psmouse_type type;
 121         bool maxproto;
 122         bool ignore_parity; /* Protocol should ignore parity errors from KBC */
 123         bool try_passthru; /* Try protocol also on passthrough ports */
 124         const char *name;
 125         const char *alias;
 126         int (*detect)(struct psmouse *, bool);
 127         int (*init)(struct psmouse *);
 128 };
 129
 130 /*
 131  * psmouse_process_byte() analyzes the PS/2 data stream and reports
 132  * relevant events to the input module once full packet has arrived.
 133  */
 134 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 135 {
 136         struct input_dev *dev = psmouse->dev;
 137         unsigned char *packet = psmouse->packet;
 138
 139         if (psmouse->pktcnt < psmouse->pktsize)
 140                 return PSMOUSE_GOOD_DATA;
 141
 142         /* Full packet accumulated, process it */
 143
 144         switch (psmouse->type) {
 145         case PSMOUSE_IMPS:
 146                 /* IntelliMouse has scroll wheel */
 147                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 148                 break;
 149
 150         case PSMOUSE_IMEX:
 151                 /* Scroll wheel and buttons on IntelliMouse Explorer */
 152                 switch (packet[3] & 0xC0) {
 153                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 154                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 155                         break;
 156                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 157                         input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 158                         break;
 159                 case 0x00:
 160                 case 0xC0:
 161                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
 162                         input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
 163                         input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
 164                         break;
 165                 }
 166                 break;
 167
 168         case PSMOUSE_GENPS:
 169                 /* Report scroll buttons on NetMice */
 170                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 171
 172                 /* Extra buttons on Genius NewNet 3D */
 173                 input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
 174                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
 175                 break;
 176
 177         case PSMOUSE_THINKPS:
 178                 /* Extra button on ThinkingMouse */
 179                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
 180
 181                 /*
 182                  * Without this bit of weirdness moving up gives wildly
 183                  * high Y changes.
 184                  */
 185                 packet[1] |= (packet[0] & 0x40) << 1;
 186                 break;
 187
 188         case PSMOUSE_CORTRON:
 189                 /*
 190                  * Cortron PS2 Trackball reports SIDE button in the
 191                  * 4th bit of the first byte.
 192                  */
 193                 input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
 194                 packet[0] |= 0x08;
 195                 break;
 196
 197         default:
 198                 break;
 199         }
 200
 201         /* Generic PS/2 Mouse */
 202         input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
 203         input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
 204         input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);
 205
 206         input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
 207         input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
 208
 209         input_sync(dev);
 210
 211         return PSMOUSE_FULL_PACKET;
 212 }
 213
 214 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 215                 unsigned long delay)
 216 {
 217         queue_delayed_work(kpsmoused_wq, work, delay);
 218 }
 219
 220 /*
 221  * __psmouse_set_state() sets new psmouse state and resets all flags.
 222  */
 223 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 224 {
 225         psmouse->state = new_state;
 226         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 227         psmouse->ps2dev.flags = 0;
 228         psmouse->last = jiffies;
 229 }
 230
 231 /*
 232  * psmouse_set_state() sets new psmouse state and resets all flags and
 233  * counters while holding serio lock so fighting with interrupt handler
 234  * is not a concern.
 235  */
 236 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 237 {
 238         serio_pause_rx(psmouse->ps2dev.serio);
 239         __psmouse_set_state(psmouse, new_state);
 240         serio_continue_rx(psmouse->ps2dev.serio);
 241 }
 242
 243 /*
 244  * psmouse_handle_byte() processes one byte of the input data stream
 245  * by calling corresponding protocol handler.
 246  */
 247 static int psmouse_handle_byte(struct psmouse *psmouse)
 248 {
 249         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 250
 251         switch (rc) {
 252         case PSMOUSE_BAD_DATA:
 253                 if (psmouse->state == PSMOUSE_ACTIVATED) {
 254                         psmouse_warn(psmouse,
 255                                      "%s at %s lost sync at byte %d\n",
 256                                      psmouse->name, psmouse->phys,
 257                                      psmouse->pktcnt);
 258                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 259                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 260                                 psmouse_notice(psmouse,
 261                                                 "issuing reconnect request\n");
 262                                 serio_reconnect(psmouse->ps2dev.serio);
 263                                 return -1;
 264                         }
 265                 }
 266                 psmouse->pktcnt = 0;
 267                 break;
 268
 269         case PSMOUSE_FULL_PACKET:
 270                 psmouse->pktcnt = 0;
 271                 if (psmouse->out_of_sync_cnt) {
 272                         psmouse->out_of_sync_cnt = 0;
 273                         psmouse_notice(psmouse,
 274                                         "%s at %s - driver resynced.\n",
 275                                         psmouse->name, psmouse->phys);
 276                 }
 277                 break;
 278
 279         case PSMOUSE_GOOD_DATA:
 280                 break;
 281         }
 282         return 0;
 283 }
 284
 285 /*
 286  * psmouse_interrupt() handles incoming characters, either passing them
 287  * for normal processing or gathering them as command response.
 288  */
 289 static irqreturn_t psmouse_interrupt(struct serio *serio,
 290                 unsigned char data, unsigned int flags)
 291 {
 292         struct psmouse *psmouse = serio_get_drvdata(serio);
 293
 294         if (psmouse->state == PSMOUSE_IGNORE)
 295                 goto out;
 296
 297         if (unlikely((flags & SERIO_TIMEOUT) ||
 298                      ((flags & SERIO_PARITY) && !psmouse->ignore_parity))) {
 299
 300                 if (psmouse->state == PSMOUSE_ACTIVATED)
 301                         psmouse_warn(psmouse,
 302                                      "bad data from KBC -%s%s\n",
 303                                      flags & SERIO_TIMEOUT ? " timeout" : "",
 304                                      flags & SERIO_PARITY ? " bad parity" : "");
 305                 ps2_cmd_aborted(&psmouse->ps2dev);
 306                 goto out;
 307         }
 308
 309         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
 310                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
 311                         goto out;
 312
 313         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
 314                 if  (ps2_handle_response(&psmouse->ps2dev, data))
 315                         goto out;
 316
 317         if (psmouse->state <= PSMOUSE_RESYNCING)
 318                 goto out;
 319
 320         if (psmouse->state == PSMOUSE_ACTIVATED &&
 321             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 322                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 323                              psmouse->name, psmouse->phys, psmouse->pktcnt);
 324                 psmouse->badbyte = psmouse->packet[0];
 325                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 326                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 327                 goto out;
 328         }
 329
 330         psmouse->packet[psmouse->pktcnt++] = data;
 331
 332         /* Check if this is a new device announcement (0xAA 0x00) */
 333         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 334                 if (psmouse->pktcnt == 1) {
 335                         psmouse->last = jiffies;
 336                         goto out;
 337                 }
 338
 339                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 340                     (psmouse->type == PSMOUSE_HGPK &&
 341                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 342                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 343                         serio_reconnect(serio);
 344                         goto out;
 345                 }
 346
 347                 /* Not a new device, try processing first byte normally */
 348                 psmouse->pktcnt = 1;
 349                 if (psmouse_handle_byte(psmouse))
 350                         goto out;
 351
 352                 psmouse->packet[psmouse->pktcnt++] = data;
 353         }
 354
 355         /*
 356          * See if we need to force resync because mouse was idle for
 357          * too long.
 358          */
 359         if (psmouse->state == PSMOUSE_ACTIVATED &&
 360             psmouse->pktcnt == 1 && psmouse->resync_time &&
 361             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 362                 psmouse->badbyte = psmouse->packet[0];
 363                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 364                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 365                 goto out;
 366         }
 367
 368         psmouse->last = jiffies;
 369         psmouse_handle_byte(psmouse);
 370
 371  out:
 372         return IRQ_HANDLED;
 373 }
 374
 375 /*
 376  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
 377  * using sliced syntax, understood by advanced devices, such as Logitech
 378  * or Synaptics touchpads. The command is encoded as:
 379  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
 380  * is the command.
 381  */
 382 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
 383 {
 384         int i;
 385
 386         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
 387                 return -1;
 388
 389         for (i = 6; i >= 0; i -= 2) {
 390                 unsigned char d = (command >> i) & 3;
 391                 if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
 392                         return -1;
 393         }
 394
 395         return 0;
 396 }
 397
 398 /*
 399  * psmouse_reset() resets the mouse into power-on state.
 400  */
 401 int psmouse_reset(struct psmouse *psmouse)
 402 {
 403         unsigned char param[2];
 404
 405         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
 406                 return -1;
 407
 408         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 409                 return -1;
 410
 411         return 0;
 412 }
 413
 414 /*
 415  * Here we set the mouse resolution.
 416  */
 417 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 418 {
 419         static const unsigned char params[] = { 0, 1, 2, 2, 3 };
 420         unsigned char p;
 421
 422         if (resolution == 0 || resolution > 200)
 423                 resolution = 200;
 424
 425         p = params[resolution / 50];
 426         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 427         psmouse->resolution = 25 << p;
 428 }
 429
 430 /*
 431  * Here we set the mouse report rate.
 432  */
 433 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 434 {
 435         static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 436         unsigned char r;
 437         int i = 0;
 438
 439         while (rates[i] > rate) i++;
 440         r = rates[i];
 441         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 442         psmouse->rate = r;
 443 }
 444
 445 /*
 446  * Here we set the mouse scaling.
 447  */
 448 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 449 {
 450         ps2_command(&psmouse->ps2dev, NULL,
 451                     scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 452                                                PSMOUSE_CMD_SETSCALE11);
 453 }
 454
 455 /*
 456  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 457  */
 458 static int psmouse_poll(struct psmouse *psmouse)
 459 {
 460         return ps2_command(&psmouse->ps2dev, psmouse->packet,
 461                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 462 }
 463
 464 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 465 {
 466         int i;
 467
 468         for (i = 0; ids[i]; i++)
 469                 if (!strcasecmp(id, ids[i]))
 470                         return true;
 471
 472         return false;
 473 }
 474
 475 /*
 476  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 477  */
 478 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 479 {
 480         struct serio *serio = psmouse->ps2dev.serio;
 481         char *p, *fw_id_copy, *save_ptr;
 482         bool found = false;
 483
 484         if (strncmp(serio->firmware_id, "PNP: ", 5))
 485                 return false;
 486
 487         fw_id_copy = kstrndup(&serio->firmware_id[5],
 488                               sizeof(serio->firmware_id) - 5,
 489                               GFP_KERNEL);
 490         if (!fw_id_copy)
 491                 return false;
 492
 493         save_ptr = fw_id_copy;
 494         while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 495                 if (psmouse_check_pnp_id(p, ids)) {
 496                         found = true;
 497                         break;
 498                 }
 499         }
 500
 501         kfree(save_ptr);
 502         return found;
 503 }
 504
 505 /*
 506  * Genius NetMouse magic init.
 507  */
 508 static int genius_detect(struct psmouse *psmouse, bool set_properties)
 509 {
 510         struct ps2dev *ps2dev = &psmouse->ps2dev;
 511         unsigned char param[4];
 512
 513         param[0] = 3;
 514         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 515         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 516         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 517         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 518         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 519
 520         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 521                 return -1;
 522
 523         if (set_properties) {
 524                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 525                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 526                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 527                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 528
 529                 psmouse->vendor = "Genius";
 530                 psmouse->name = "Mouse";
 531                 psmouse->pktsize = 4;
 532         }
 533
 534         return 0;
 535 }
 536
 537 /*
 538  * IntelliMouse magic init.
 539  */
 540 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 541 {
 542         struct ps2dev *ps2dev = &psmouse->ps2dev;
 543         unsigned char param[2];
 544
 545         param[0] = 200;
 546         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 547         param[0] = 100;
 548         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 549         param[0] =  80;
 550         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 551         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 552
 553         if (param[0] != 3)
 554                 return -1;
 555
 556         if (set_properties) {
 557                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 558                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 559
 560                 if (!psmouse->vendor)
 561                         psmouse->vendor = "Generic";
 562                 if (!psmouse->name)
 563                         psmouse->name = "Wheel Mouse";
 564                 psmouse->pktsize = 4;
 565         }
 566
 567         return 0;
 568 }
 569
 570 /*
 571  * Try IntelliMouse/Explorer magic init.
 572  */
 573 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 574 {
 575         struct ps2dev *ps2dev = &psmouse->ps2dev;
 576         unsigned char param[2];
 577
 578         intellimouse_detect(psmouse, 0);
 579
 580         param[0] = 200;
 581         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 582         param[0] = 200;
 583         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 584         param[0] =  80;
 585         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 586         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 587
 588         if (param[0] != 4)
 589                 return -1;
 590
 591         /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 592         param[0] = 200;
 593         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 594         param[0] =  80;
 595         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 596         param[0] =  40;
 597         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 598
 599         if (set_properties) {
 600                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 601                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 602                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
 603                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 604                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 605
 606                 if (!psmouse->vendor)
 607                         psmouse->vendor = "Generic";
 608                 if (!psmouse->name)
 609                         psmouse->name = "Explorer Mouse";
 610                 psmouse->pktsize = 4;
 611         }
 612
 613         return 0;
 614 }
 615
 616 /*
 617  * Kensington ThinkingMouse / ExpertMouse magic init.
 618  */
 619 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 620 {
 621         struct ps2dev *ps2dev = &psmouse->ps2dev;
 622         unsigned char param[2];
 623         static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 624         int i;
 625
 626         param[0] = 10;
 627         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 628         param[0] = 0;
 629         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 630         for (i = 0; i < ARRAY_SIZE(seq); i++) {
 631                 param[0] = seq[i];
 632                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 633         }
 634         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 635
 636         if (param[0] != 2)
 637                 return -1;
 638
 639         if (set_properties) {
 640                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 641                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 642
 643                 psmouse->vendor = "Kensington";
 644                 psmouse->name = "ThinkingMouse";
 645         }
 646
 647         return 0;
 648 }
 649
 650 /*
 651  * Bare PS/2 protocol "detection". Always succeeds.
 652  */
 653 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 654 {
 655         if (set_properties) {
 656                 if (!psmouse->vendor)
 657                         psmouse->vendor = "Generic";
 658                 if (!psmouse->name)
 659                         psmouse->name = "Mouse";
 660
 661                 /*
 662                  * We have no way of figuring true number of buttons so let's
 663                  * assume that the device has 3.
 664                  */
 665                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 666         }
 667
 668         return 0;
 669 }
 670
 671 /*
 672  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 673  * must be forced by sysfs protocol writing.
 674  */
 675 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 676 {
 677         if (set_properties) {
 678                 psmouse->vendor = "Cortron";
 679                 psmouse->name = "PS/2 Trackball";
 680
 681                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 682                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 683         }
 684
 685         return 0;
 686 }
 687
 688 static const struct psmouse_protocol psmouse_protocols[] = {
 689         {
 690                 .type           = PSMOUSE_PS2,
 691                 .name           = "PS/2",
 692                 .alias          = "bare",
 693                 .maxproto       = true,
 694                 .ignore_parity  = true,
 695                 .detect         = ps2bare_detect,
 696                 .try_passthru   = true,
 697         },
 698 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 699         {
 700                 .type           = PSMOUSE_PS2PP,
 701                 .name           = "PS2++",
 702                 .alias          = "logitech",
 703                 .detect         = ps2pp_detect,
 704         },
 705 #endif
 706         {
 707                 .type           = PSMOUSE_THINKPS,
 708                 .name           = "ThinkPS/2",
 709                 .alias          = "thinkps",
 710                 .detect         = thinking_detect,
 711         },
 712 #ifdef CONFIG_MOUSE_PS2_CYPRESS
 713         {
 714                 .type           = PSMOUSE_CYPRESS,
 715                 .name           = "CyPS/2",
 716                 .alias          = "cypress",
 717                 .detect         = cypress_detect,
 718                 .init           = cypress_init,
 719         },
 720 #endif
 721         {
 722                 .type           = PSMOUSE_GENPS,
 723                 .name           = "GenPS/2",
 724                 .alias          = "genius",
 725                 .detect         = genius_detect,
 726         },
 727         {
 728                 .type           = PSMOUSE_IMPS,
 729                 .name           = "ImPS/2",
 730                 .alias          = "imps",
 731                 .maxproto       = true,
 732                 .ignore_parity  = true,
 733                 .detect         = intellimouse_detect,
 734                 .try_passthru   = true,
 735         },
 736         {
 737                 .type           = PSMOUSE_IMEX,
 738                 .name           = "ImExPS/2",
 739                 .alias          = "exps",
 740                 .maxproto       = true,
 741                 .ignore_parity  = true,
 742                 .detect         = im_explorer_detect,
 743                 .try_passthru   = true,
 744         },
 745 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 746         {
 747                 .type           = PSMOUSE_SYNAPTICS,
 748                 .name           = "SynPS/2",
 749                 .alias          = "synaptics",
 750                 .detect         = synaptics_detect,
 751                 .init           = synaptics_init,
 752         },
 753         {
 754                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
 755                 .name           = "SynRelPS/2",
 756                 .alias          = "synaptics-relative",
 757                 .detect         = synaptics_detect,
 758                 .init           = synaptics_init_relative,
 759         },
 760 #endif
 761 #ifdef CONFIG_MOUSE_PS2_ALPS
 762         {
 763                 .type           = PSMOUSE_ALPS,
 764                 .name           = "AlpsPS/2",
 765                 .alias          = "alps",
 766                 .detect         = alps_detect,
 767                 .init           = alps_init,
 768         },
 769 #endif
 770 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 771         {
 772                 .type           = PSMOUSE_LIFEBOOK,
 773                 .name           = "LBPS/2",
 774                 .alias          = "lifebook",
 775                 .detect         = lifebook_detect,
 776                 .init           = lifebook_init,
 777         },
 778 #endif
 779 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 780         {
 781                 .type           = PSMOUSE_TRACKPOINT,
 782                 .name           = "TPPS/2",
 783                 .alias          = "trackpoint",
 784                 .detect         = trackpoint_detect,
 785                 .try_passthru   = true,
 786         },
 787 #endif
 788 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 789         {
 790                 .type           = PSMOUSE_TOUCHKIT_PS2,
 791                 .name           = "touchkitPS/2",
 792                 .alias          = "touchkit",
 793                 .detect         = touchkit_ps2_detect,
 794         },
 795 #endif
 796 #ifdef CONFIG_MOUSE_PS2_OLPC
 797         {
 798                 .type           = PSMOUSE_HGPK,
 799                 .name           = "OLPC HGPK",
 800                 .alias          = "hgpk",
 801                 .detect         = hgpk_detect,
 802         },
 803 #endif
 804 #ifdef CONFIG_MOUSE_PS2_ELANTECH
 805         {
 806                 .type           = PSMOUSE_ELANTECH,
 807                 .name           = "ETPS/2",
 808                 .alias          = "elantech",
 809                 .detect         = elantech_detect,
 810                 .init           = elantech_init,
 811         },
 812 #endif
 813 #ifdef CONFIG_MOUSE_PS2_SENTELIC
 814         {
 815                 .type           = PSMOUSE_FSP,
 816                 .name           = "FSPPS/2",
 817                 .alias          = "fsp",
 818                 .detect         = fsp_detect,
 819                 .init           = fsp_init,
 820         },
 821 #endif
 822         {
 823                 .type           = PSMOUSE_CORTRON,
 824                 .name           = "CortronPS/2",
 825                 .alias          = "cortps",
 826                 .detect         = cortron_detect,
 827         },
 828 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
 829         {
 830                 .type           = PSMOUSE_FOCALTECH,
 831                 .name           = "FocalTechPS/2",
 832                 .alias          = "focaltech",
 833                 .detect         = focaltech_detect,
 834                 .init           = focaltech_init,
 835         },
 836 #endif
 837 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
 838         {
 839                 .type           = PSMOUSE_VMMOUSE,
 840                 .name           = VMMOUSE_PSNAME,
 841                 .alias          = "vmmouse",
 842                 .detect         = vmmouse_detect,
 843                 .init           = vmmouse_init,
 844         },
 845 #endif
 846 #ifdef CONFIG_MOUSE_PS2_BYD
 847         {
 848                 .type           = PSMOUSE_BYD,
 849                 .name           = "BYDPS/2",
 850                 .alias          = "byd",
 851                 .detect         = byd_detect,
 852                 .init           = byd_init,
 853         },
 854 #endif
 855         {
 856                 .type           = PSMOUSE_AUTO,
 857                 .name           = "auto",
 858                 .alias          = "any",
 859                 .maxproto       = true,
 860         },
 861 };
 862
 863 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 864 {
 865         int i;
 866
 867         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 868                 if (psmouse_protocols[i].type == type)
 869                         return &psmouse_protocols[i];
 870
 871         return NULL;
 872 }
 873
 874 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 875 {
 876         const struct psmouse_protocol *proto;
 877
 878         proto = __psmouse_protocol_by_type(type);
 879         if (proto)
 880                 return proto;
 881
 882         WARN_ON(1);
 883         return &psmouse_protocols[0];
 884 }
 885
 886 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 887 {
 888         const struct psmouse_protocol *p;
 889         int i;
 890
 891         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 892                 p = &psmouse_protocols[i];
 893
 894                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 895                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 896                         return &psmouse_protocols[i];
 897         }
 898
 899         return NULL;
 900 }
 901
 902 /*
 903  * Apply default settings to the psmouse structure. Most of them will
 904  * be overridden by individual protocol initialization routines.
 905  */
 906 static void psmouse_apply_defaults(struct psmouse *psmouse)
 907 {
 908         struct input_dev *input_dev = psmouse->dev;
 909
 910         memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
 911         memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
 912         memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
 913         memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
 914         memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
 915
 916         __set_bit(EV_KEY, input_dev->evbit);
 917         __set_bit(EV_REL, input_dev->evbit);
 918
 919         __set_bit(BTN_LEFT, input_dev->keybit);
 920         __set_bit(BTN_RIGHT, input_dev->keybit);
 921
 922         __set_bit(REL_X, input_dev->relbit);
 923         __set_bit(REL_Y, input_dev->relbit);
 924
 925         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 926
 927         psmouse->set_rate = psmouse_set_rate;
 928         psmouse->set_resolution = psmouse_set_resolution;
 929         psmouse->set_scale = psmouse_set_scale;
 930         psmouse->poll = psmouse_poll;
 931         psmouse->protocol_handler = psmouse_process_byte;
 932         psmouse->pktsize = 3;
 933         psmouse->reconnect = NULL;
 934         psmouse->disconnect = NULL;
 935         psmouse->cleanup = NULL;
 936         psmouse->pt_activate = NULL;
 937         psmouse->pt_deactivate = NULL;
 938 }
 939
 940 static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
 941                               struct psmouse *psmouse, bool allow_passthrough,
 942                               bool set_properties)
 943 {
 944         if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
 945             !allow_passthrough) {
 946                 return false;
 947         }
 948
 949         if (set_properties)
 950                 psmouse_apply_defaults(psmouse);
 951
 952         return detect(psmouse, set_properties) == 0;
 953 }
 954
 955 static bool psmouse_try_protocol(struct psmouse *psmouse,
 956                                  enum psmouse_type type,
 957                                  unsigned int *max_proto,
 958                                  bool set_properties, bool init_allowed)
 959 {
 960         const struct psmouse_protocol *proto;
 961
 962         proto = __psmouse_protocol_by_type(type);
 963         if (!proto)
 964                 return false;
 965
 966         if (!psmouse_do_detect(proto->detect, psmouse, proto->try_passthru,
 967                                set_properties))
 968                 return false;
 969
 970         if (set_properties && proto->init && init_allowed) {
 971                 if (proto->init(psmouse) != 0) {
 972                         /*
 973                          * We detected device, but init failed. Adjust
 974                          * max_proto so we only try standard protocols.
 975                          */
 976                         if (*max_proto > PSMOUSE_IMEX)
 977                                 *max_proto = PSMOUSE_IMEX;
 978
 979                         return false;
 980                 }
 981         }
 982
 983         return true;
 984 }
 985
 986 /*
 987  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
 988  * the mouse may have.
 989  */
 990 static int psmouse_extensions(struct psmouse *psmouse,
 991                               unsigned int max_proto, bool set_properties)
 992 {
 993         bool synaptics_hardware = false;
 994
 995         /*
 996          * Always check for focaltech, this is safe as it uses pnp-id
 997          * matching.
 998          */
 999         if (psmouse_do_detect(focaltech_detect,
1000                               psmouse, false, set_properties)) {
1001                 if (max_proto > PSMOUSE_IMEX &&
1002                     IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
1003                     (!set_properties || focaltech_init(psmouse) == 0)) {
1004                         return PSMOUSE_FOCALTECH;
1005                 }
1006                 /*
1007                  * Restrict psmouse_max_proto so that psmouse_initialize()
1008                  * does not try to reset rate and resolution, because even
1009                  * that upsets the device.
1010                  * This also causes us to basically fall through to basic
1011                  * protocol detection, where we fully reset the mouse,
1012                  * and set it up as bare PS/2 protocol device.
1013                  */
1014                 psmouse_max_proto = max_proto = PSMOUSE_PS2;
1015         }
1016
1017         /*
1018          * We always check for LifeBook because it does not disturb mouse
1019          * (it only checks DMI information).
1020          */
1021         if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1022                                  set_properties, max_proto > PSMOUSE_IMEX))
1023                 return PSMOUSE_LIFEBOOK;
1024
1025         if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1026                                  set_properties, max_proto > PSMOUSE_IMEX))
1027                 return PSMOUSE_VMMOUSE;
1028
1029         /*
1030          * Try Kensington ThinkingMouse (we try first, because Synaptics
1031          * probe upsets the ThinkingMouse).
1032          */
1033         if (max_proto > PSMOUSE_IMEX &&
1034             psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1035                                  set_properties, true)) {
1036                 return PSMOUSE_THINKPS;
1037         }
1038
1039         /*
1040          * Try Synaptics TouchPad. Note that probing is done even if
1041          * Synaptics protocol support is disabled in config - we need to
1042          * know if it is Synaptics so we can reset it properly after
1043          * probing for IntelliMouse.
1044          */
1045         if (max_proto > PSMOUSE_PS2 &&
1046             psmouse_do_detect(synaptics_detect,
1047                               psmouse, false, set_properties)) {
1048                 synaptics_hardware = true;
1049
1050                 if (max_proto > PSMOUSE_IMEX) {
1051                         /*
1052                          * Try activating protocol, but check if support is
1053                          * enabled first, since we try detecting Synaptics
1054                          * even when protocol is disabled.
1055                          */
1056                         if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) &&
1057                             (!set_properties || synaptics_init(psmouse) == 0)) {
1058                                 return PSMOUSE_SYNAPTICS;
1059                         }
1060
1061                         /*
1062                          * Some Synaptics touchpads can emulate extended
1063                          * protocols (like IMPS/2).  Unfortunately
1064                          * Logitech/Genius probes confuse some firmware
1065                          * versions so we'll have to skip them.
1066                          */
1067                         max_proto = PSMOUSE_IMEX;
1068                 }
1069
1070                 /*
1071                  * Make sure that touchpad is in relative mode, gestures
1072                  * (taps) are enabled.
1073                  */
1074                 synaptics_reset(psmouse);
1075         }
1076
1077         /*
1078          * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1079          * because Finger Sensing Pad probe upsets some modules of Cypress
1080          * Trackpads.
1081          */
1082         if (max_proto > PSMOUSE_IMEX &&
1083             psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1084                                  set_properties, true)) {
1085                 return PSMOUSE_CYPRESS;
1086         }
1087
1088         /* Try ALPS TouchPad */
1089         if (max_proto > PSMOUSE_IMEX) {
1090                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1091                 if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1092                                          &max_proto, set_properties, true))
1093                         return PSMOUSE_ALPS;
1094         }
1095
1096         /* Try OLPC HGPK touchpad */
1097         if (max_proto > PSMOUSE_IMEX &&
1098             psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1099                                  set_properties, true)) {
1100                 return PSMOUSE_HGPK;
1101         }
1102
1103         /* Try Elantech touchpad */
1104         if (max_proto > PSMOUSE_IMEX &&
1105             psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1106                                  &max_proto, set_properties, true)) {
1107                 return PSMOUSE_ELANTECH;
1108         }
1109
1110         if (max_proto > PSMOUSE_IMEX) {
1111                 if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1112                                          &max_proto, set_properties, true))
1113                         return PSMOUSE_GENPS;
1114
1115                 if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1116                                          &max_proto, set_properties, true))
1117                         return PSMOUSE_PS2PP;
1118
1119                 if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1120                                          &max_proto, set_properties, true))
1121                         return PSMOUSE_TRACKPOINT;
1122
1123                 if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1124                                          &max_proto, set_properties, true))
1125                         return PSMOUSE_TOUCHKIT_PS2;
1126         }
1127
1128         /*
1129          * Try Finger Sensing Pad. We do it here because its probe upsets
1130          * Trackpoint devices (causing TP_READ_ID command to time out).
1131          */
1132         if (max_proto > PSMOUSE_IMEX &&
1133             psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1134                                  &max_proto, set_properties, true)) {
1135                 return PSMOUSE_FSP;
1136         }
1137
1138         /*
1139          * Reset to defaults in case the device got confused by extended
1140          * protocol probes. Note that we follow up with full reset because
1141          * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1142          */
1143         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1144         psmouse_reset(psmouse);
1145
1146         if (max_proto >= PSMOUSE_IMEX &&
1147             psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1148                                  &max_proto, set_properties, true)) {
1149                 return PSMOUSE_IMEX;
1150         }
1151
1152         if (max_proto >= PSMOUSE_IMPS &&
1153             psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1154                                  &max_proto, set_properties, true)) {
1155                 return PSMOUSE_IMPS;
1156         }
1157
1158         /*
1159          * Okay, all failed, we have a standard mouse here. The number of
1160          * the buttons is still a question, though. We assume 3.
1161          */
1162         psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1163                              &max_proto, set_properties, true);
1164
1165         if (synaptics_hardware) {
1166                 /*
1167                  * We detected Synaptics hardware but it did not respond to
1168                  * IMPS/2 probes.  We need to reset the touchpad because if
1169                  * there is a track point on the pass through port it could
1170                  * get disabled while probing for protocol extensions.
1171                  */
1172                 psmouse_reset(psmouse);
1173         }
1174
1175         return PSMOUSE_PS2;
1176 }
1177
1178 /*
1179  * psmouse_probe() probes for a PS/2 mouse.
1180  */
1181 static int psmouse_probe(struct psmouse *psmouse)
1182 {
1183         struct ps2dev *ps2dev = &psmouse->ps2dev;
1184         unsigned char param[2];
1185
1186         /*
1187          * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1188          * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1189          * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1190          * subsequent ID queries, probably due to a firmware bug.
1191          */
1192         param[0] = 0xa5;
1193         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
1194                 return -1;
1195
1196         if (param[0] != 0x00 && param[0] != 0x03 &&
1197             param[0] != 0x04 && param[0] != 0xff)
1198                 return -1;
1199
1200         /*
1201          * Then we reset and disable the mouse so that it doesn't generate
1202          * events.
1203          */
1204         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
1205                 psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
1206                              ps2dev->serio->phys);
1207
1208         return 0;
1209 }
1210
1211 /*
1212  * psmouse_initialize() initializes the mouse to a sane state.
1213  */
1214 static void psmouse_initialize(struct psmouse *psmouse)
1215 {
1216         /*
1217          * We set the mouse report rate, resolution and scaling.
1218          */
1219         if (psmouse_max_proto != PSMOUSE_PS2) {
1220                 psmouse->set_rate(psmouse, psmouse->rate);
1221                 psmouse->set_resolution(psmouse, psmouse->resolution);
1222                 psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1223         }
1224 }
1225
1226 /*
1227  * psmouse_activate() enables the mouse so that we get motion reports from it.
1228  */
1229 int psmouse_activate(struct psmouse *psmouse)
1230 {
1231         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1232                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1233                              psmouse->ps2dev.serio->phys);
1234                 return -1;
1235         }
1236
1237         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1238         return 0;
1239 }
1240
1241 /*
1242  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1243  * motion reports from it unless we explicitly request it.
1244  */
1245 int psmouse_deactivate(struct psmouse *psmouse)
1246 {
1247         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
1248                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
1249                              psmouse->ps2dev.serio->phys);
1250                 return -1;
1251         }
1252
1253         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1254         return 0;
1255 }
1256
1257 /*
1258  * psmouse_resync() attempts to re-validate current protocol.
1259  */
1260 static void psmouse_resync(struct work_struct *work)
1261 {
1262         struct psmouse *parent = NULL, *psmouse =
1263                 container_of(work, struct psmouse, resync_work.work);
1264         struct serio *serio = psmouse->ps2dev.serio;
1265         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1266         bool failed = false, enabled = false;
1267         int i;
1268
1269         mutex_lock(&psmouse_mutex);
1270
1271         if (psmouse->state != PSMOUSE_RESYNCING)
1272                 goto out;
1273
1274         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1275                 parent = serio_get_drvdata(serio->parent);
1276                 psmouse_deactivate(parent);
1277         }
1278
1279         /*
1280          * Some mice don't ACK commands sent while they are in the middle of
1281          * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1282          * instead of ps2_command() which would wait for 200ms for an ACK
1283          * that may never come.
1284          * As an additional quirk ALPS touchpads may not only forget to ACK
1285          * disable command but will stop reporting taps, so if we see that
1286          * mouse at least once ACKs disable we will do full reconnect if ACK
1287          * is missing.
1288          */
1289         psmouse->num_resyncs++;
1290
1291         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1292                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1293                         failed = true;
1294         } else
1295                 psmouse->acks_disable_command = true;
1296
1297         /*
1298          * Poll the mouse. If it was reset the packet will be shorter than
1299          * psmouse->pktsize and ps2_command will fail. We do not expect and
1300          * do not handle scenario when mouse "upgrades" its protocol while
1301          * disconnected since it would require additional delay. If we ever
1302          * see a mouse that does it we'll adjust the code.
1303          */
1304         if (!failed) {
1305                 if (psmouse->poll(psmouse))
1306                         failed = true;
1307                 else {
1308                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1309                         for (i = 0; i < psmouse->pktsize; i++) {
1310                                 psmouse->pktcnt++;
1311                                 rc = psmouse->protocol_handler(psmouse);
1312                                 if (rc != PSMOUSE_GOOD_DATA)
1313                                         break;
1314                         }
1315                         if (rc != PSMOUSE_FULL_PACKET)
1316                                 failed = true;
1317                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1318                 }
1319         }
1320
1321         /*
1322          * Now try to enable mouse. We try to do that even if poll failed
1323          * and also repeat our attempts 5 times, otherwise we may be left
1324          * out with disabled mouse.
1325          */
1326         for (i = 0; i < 5; i++) {
1327                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1328                         enabled = true;
1329                         break;
1330                 }
1331                 msleep(200);
1332         }
1333
1334         if (!enabled) {
1335                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1336                              psmouse->ps2dev.serio->phys);
1337                 failed = true;
1338         }
1339
1340         if (failed) {
1341                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1342                 psmouse_info(psmouse,
1343                              "resync failed, issuing reconnect request\n");
1344                 serio_reconnect(serio);
1345         } else
1346                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1347
1348         if (parent)
1349                 psmouse_activate(parent);
1350  out:
1351         mutex_unlock(&psmouse_mutex);
1352 }
1353
1354 /*
1355  * psmouse_cleanup() resets the mouse into power-on state.
1356  */
1357 static void psmouse_cleanup(struct serio *serio)
1358 {
1359         struct psmouse *psmouse = serio_get_drvdata(serio);
1360         struct psmouse *parent = NULL;
1361
1362         mutex_lock(&psmouse_mutex);
1363
1364         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1365                 parent = serio_get_drvdata(serio->parent);
1366                 psmouse_deactivate(parent);
1367         }
1368
1369         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1370
1371         /*
1372          * Disable stream mode so cleanup routine can proceed undisturbed.
1373          */
1374         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1375                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1376                              psmouse->ps2dev.serio->phys);
1377
1378         if (psmouse->cleanup)
1379                 psmouse->cleanup(psmouse);
1380
1381         /*
1382          * Reset the mouse to defaults (bare PS/2 protocol).
1383          */
1384         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1385
1386         /*
1387          * Some boxes, such as HP nx7400, get terribly confused if mouse
1388          * is not fully enabled before suspending/shutting down.
1389          */
1390         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1391
1392         if (parent) {
1393                 if (parent->pt_deactivate)
1394                         parent->pt_deactivate(parent);
1395
1396                 psmouse_activate(parent);
1397         }
1398
1399         mutex_unlock(&psmouse_mutex);
1400 }
1401
1402 /*
1403  * psmouse_disconnect() closes and frees.
1404  */
1405 static void psmouse_disconnect(struct serio *serio)
1406 {
1407         struct psmouse *psmouse, *parent = NULL;
1408
1409         psmouse = serio_get_drvdata(serio);
1410
1411         sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1412
1413         mutex_lock(&psmouse_mutex);
1414
1415         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1416
1417         /* make sure we don't have a resync in progress */
1418         mutex_unlock(&psmouse_mutex);
1419         flush_workqueue(kpsmoused_wq);
1420         mutex_lock(&psmouse_mutex);
1421
1422         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1423                 parent = serio_get_drvdata(serio->parent);
1424                 psmouse_deactivate(parent);
1425         }
1426
1427         if (psmouse->disconnect)
1428                 psmouse->disconnect(psmouse);
1429
1430         if (parent && parent->pt_deactivate)
1431                 parent->pt_deactivate(parent);
1432
1433         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1434
1435         serio_close(serio);
1436         serio_set_drvdata(serio, NULL);
1437         input_unregister_device(psmouse->dev);
1438         kfree(psmouse);
1439
1440         if (parent)
1441                 psmouse_activate(parent);
1442
1443         mutex_unlock(&psmouse_mutex);
1444 }
1445
1446 static int psmouse_switch_protocol(struct psmouse *psmouse,
1447                                    const struct psmouse_protocol *proto)
1448 {
1449         const struct psmouse_protocol *selected_proto;
1450         struct input_dev *input_dev = psmouse->dev;
1451
1452         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1453
1454         if (proto && (proto->detect || proto->init)) {
1455                 psmouse_apply_defaults(psmouse);
1456
1457                 if (proto->detect && proto->detect(psmouse, true) < 0)
1458                         return -1;
1459
1460                 if (proto->init && proto->init(psmouse) < 0)
1461                         return -1;
1462
1463                 psmouse->type = proto->type;
1464                 selected_proto = proto;
1465         } else {
1466                 psmouse->type = psmouse_extensions(psmouse,
1467                                                    psmouse_max_proto, true);
1468                 selected_proto = psmouse_protocol_by_type(psmouse->type);
1469         }
1470
1471         psmouse->ignore_parity = selected_proto->ignore_parity;
1472
1473         /*
1474          * If mouse's packet size is 3 there is no point in polling the
1475          * device in hopes to detect protocol reset - we won't get less
1476          * than 3 bytes response anyhow.
1477          */
1478         if (psmouse->pktsize == 3)
1479                 psmouse->resync_time = 0;
1480
1481         /*
1482          * Some smart KVMs fake response to POLL command returning just
1483          * 3 bytes and messing up our resync logic, so if initial poll
1484          * fails we won't try polling the device anymore. Hopefully
1485          * such KVM will maintain initially selected protocol.
1486          */
1487         if (psmouse->resync_time && psmouse->poll(psmouse))
1488                 psmouse->resync_time = 0;
1489
1490         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1491                  selected_proto->name, psmouse->vendor, psmouse->name);
1492
1493         input_dev->name = psmouse->devname;
1494         input_dev->phys = psmouse->phys;
1495         input_dev->id.bustype = BUS_I8042;
1496         input_dev->id.vendor = 0x0002;
1497         input_dev->id.product = psmouse->type;
1498         input_dev->id.version = psmouse->model;
1499
1500         return 0;
1501 }
1502
1503 /*
1504  * psmouse_connect() is a callback from the serio module when
1505  * an unhandled serio port is found.
1506  */
1507 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1508 {
1509         struct psmouse *psmouse, *parent = NULL;
1510         struct input_dev *input_dev;
1511         int retval = 0, error = -ENOMEM;
1512
1513         mutex_lock(&psmouse_mutex);
1514
1515         /*
1516          * If this is a pass-through port deactivate parent so the device
1517          * connected to this port can be successfully identified
1518          */
1519         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1520                 parent = serio_get_drvdata(serio->parent);
1521                 psmouse_deactivate(parent);
1522         }
1523
1524         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1525         input_dev = input_allocate_device();
1526         if (!psmouse || !input_dev)
1527                 goto err_free;
1528
1529         ps2_init(&psmouse->ps2dev, serio);
1530         INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1531         psmouse->dev = input_dev;
1532         snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1533
1534         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1535
1536         serio_set_drvdata(serio, psmouse);
1537
1538         error = serio_open(serio, drv);
1539         if (error)
1540                 goto err_clear_drvdata;
1541
1542         /* give PT device some time to settle down before probing */
1543         if (serio->id.type == SERIO_PS_PSTHRU)
1544                 usleep_range(10000, 15000);
1545
1546         if (psmouse_probe(psmouse) < 0) {
1547                 error = -ENODEV;
1548                 goto err_close_serio;
1549         }
1550
1551         psmouse->rate = psmouse_rate;
1552         psmouse->resolution = psmouse_resolution;
1553         psmouse->resetafter = psmouse_resetafter;
1554         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1555         psmouse->smartscroll = psmouse_smartscroll;
1556
1557         psmouse_switch_protocol(psmouse, NULL);
1558
1559         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1560         psmouse_initialize(psmouse);
1561
1562         error = input_register_device(psmouse->dev);
1563         if (error)
1564                 goto err_protocol_disconnect;
1565
1566         if (parent && parent->pt_activate)
1567                 parent->pt_activate(parent);
1568
1569         error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1570         if (error)
1571                 goto err_pt_deactivate;
1572
1573         psmouse_activate(psmouse);
1574
1575  out:
1576         /* If this is a pass-through port the parent needs to be re-activated */
1577         if (parent)
1578                 psmouse_activate(parent);
1579
1580         mutex_unlock(&psmouse_mutex);
1581         return retval;
1582
1583  err_pt_deactivate:
1584         if (parent && parent->pt_deactivate)
1585                 parent->pt_deactivate(parent);
1586         input_unregister_device(psmouse->dev);
1587         input_dev = NULL; /* so we don't try to free it below */
1588  err_protocol_disconnect:
1589         if (psmouse->disconnect)
1590                 psmouse->disconnect(psmouse);
1591         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1592  err_close_serio:
1593         serio_close(serio);
1594  err_clear_drvdata:
1595         serio_set_drvdata(serio, NULL);
1596  err_free:
1597         input_free_device(input_dev);
1598         kfree(psmouse);
1599
1600         retval = error;
1601         goto out;
1602 }
1603
1604 static int psmouse_reconnect(struct serio *serio)
1605 {
1606         struct psmouse *psmouse = serio_get_drvdata(serio);
1607         struct psmouse *parent = NULL;
1608         unsigned char type;
1609         int rc = -1;
1610
1611         mutex_lock(&psmouse_mutex);
1612
1613         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1614                 parent = serio_get_drvdata(serio->parent);
1615                 psmouse_deactivate(parent);
1616         }
1617
1618         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1619
1620         if (psmouse->reconnect) {
1621                 if (psmouse->reconnect(psmouse))
1622                         goto out;
1623         } else {
1624                 psmouse_reset(psmouse);
1625
1626                 if (psmouse_probe(psmouse) < 0)
1627                         goto out;
1628
1629                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1630                 if (psmouse->type != type)
1631                         goto out;
1632         }
1633
1634         /*
1635          * OK, the device type (and capabilities) match the old one,
1636          * we can continue using it, complete initialization
1637          */
1638         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1639
1640         psmouse_initialize(psmouse);
1641
1642         if (parent && parent->pt_activate)
1643                 parent->pt_activate(parent);
1644
1645         psmouse_activate(psmouse);
1646         rc = 0;
1647
1648 out:
1649         /* If this is a pass-through port the parent waits to be activated */
1650         if (parent)
1651                 psmouse_activate(parent);
1652
1653         mutex_unlock(&psmouse_mutex);
1654         return rc;
1655 }
1656
1657 static struct serio_device_id psmouse_serio_ids[] = {
1658         {
1659                 .type   = SERIO_8042,
1660                 .proto  = SERIO_ANY,
1661                 .id     = SERIO_ANY,
1662                 .extra  = SERIO_ANY,
1663         },
1664         {
1665                 .type   = SERIO_PS_PSTHRU,
1666                 .proto  = SERIO_ANY,
1667                 .id     = SERIO_ANY,
1668                 .extra  = SERIO_ANY,
1669         },
1670         { 0 }
1671 };
1672
1673 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1674
1675 static struct serio_driver psmouse_drv = {
1676         .driver         = {
1677                 .name   = "psmouse",
1678         },
1679         .description    = DRIVER_DESC,
1680         .id_table       = psmouse_serio_ids,
1681         .interrupt      = psmouse_interrupt,
1682         .connect        = psmouse_connect,
1683         .reconnect      = psmouse_reconnect,
1684         .disconnect     = psmouse_disconnect,
1685         .cleanup        = psmouse_cleanup,
1686 };
1687
1688 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1689                                  char *buf)
1690 {
1691         struct serio *serio = to_serio_port(dev);
1692         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1693         struct psmouse *psmouse;
1694
1695         psmouse = serio_get_drvdata(serio);
1696
1697         return attr->show(psmouse, attr->data, buf);
1698 }
1699
1700 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1701                                 const char *buf, size_t count)
1702 {
1703         struct serio *serio = to_serio_port(dev);
1704         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1705         struct psmouse *psmouse, *parent = NULL;
1706         int retval;
1707
1708         retval = mutex_lock_interruptible(&psmouse_mutex);
1709         if (retval)
1710                 goto out;
1711
1712         psmouse = serio_get_drvdata(serio);
1713
1714         if (attr->protect) {
1715                 if (psmouse->state == PSMOUSE_IGNORE) {
1716                         retval = -ENODEV;
1717                         goto out_unlock;
1718                 }
1719
1720                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1721                         parent = serio_get_drvdata(serio->parent);
1722                         psmouse_deactivate(parent);
1723                 }
1724
1725                 psmouse_deactivate(psmouse);
1726         }
1727
1728         retval = attr->set(psmouse, attr->data, buf, count);
1729
1730         if (attr->protect) {
1731                 if (retval != -ENODEV)
1732                         psmouse_activate(psmouse);
1733
1734                 if (parent)
1735                         psmouse_activate(parent);
1736         }
1737
1738  out_unlock:
1739         mutex_unlock(&psmouse_mutex);
1740  out:
1741         return retval;
1742 }
1743
1744 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1745 {
1746         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1747
1748         return sprintf(buf, "%u\n", *field);
1749 }
1750
1751 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1752 {
1753         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1754         unsigned int value;
1755         int err;
1756
1757         err = kstrtouint(buf, 10, &value);
1758         if (err)
1759                 return err;
1760
1761         *field = value;
1762
1763         return count;
1764 }
1765
1766 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1767 {
1768         return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
1769 }
1770
1771 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1772 {
1773         struct serio *serio = psmouse->ps2dev.serio;
1774         struct psmouse *parent = NULL;
1775         struct input_dev *old_dev, *new_dev;
1776         const struct psmouse_protocol *proto, *old_proto;
1777         int error;
1778         int retry = 0;
1779
1780         proto = psmouse_protocol_by_name(buf, count);
1781         if (!proto)
1782                 return -EINVAL;
1783
1784         if (psmouse->type == proto->type)
1785                 return count;
1786
1787         new_dev = input_allocate_device();
1788         if (!new_dev)
1789                 return -ENOMEM;
1790
1791         while (!list_empty(&serio->children)) {
1792                 if (++retry > 3) {
1793                         psmouse_warn(psmouse,
1794                                      "failed to destroy children ports, protocol change aborted.\n");
1795                         input_free_device(new_dev);
1796                         return -EIO;
1797                 }
1798
1799                 mutex_unlock(&psmouse_mutex);
1800                 serio_unregister_child_port(serio);
1801                 mutex_lock(&psmouse_mutex);
1802
1803                 if (serio->drv != &psmouse_drv) {
1804                         input_free_device(new_dev);
1805                         return -ENODEV;
1806                 }
1807
1808                 if (psmouse->type == proto->type) {
1809                         input_free_device(new_dev);
1810                         return count; /* switched by other thread */
1811                 }
1812         }
1813
1814         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1815                 parent = serio_get_drvdata(serio->parent);
1816                 if (parent->pt_deactivate)
1817                         parent->pt_deactivate(parent);
1818         }
1819
1820         old_dev = psmouse->dev;
1821         old_proto = psmouse_protocol_by_type(psmouse->type);
1822
1823         if (psmouse->disconnect)
1824                 psmouse->disconnect(psmouse);
1825
1826         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1827
1828         psmouse->dev = new_dev;
1829         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1830
1831         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1832                 psmouse_reset(psmouse);
1833                 /* default to PSMOUSE_PS2 */
1834                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1835         }
1836
1837         psmouse_initialize(psmouse);
1838         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1839
1840         error = input_register_device(psmouse->dev);
1841         if (error) {
1842                 if (psmouse->disconnect)
1843                         psmouse->disconnect(psmouse);
1844
1845                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1846                 input_free_device(new_dev);
1847                 psmouse->dev = old_dev;
1848                 psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1849                 psmouse_switch_protocol(psmouse, old_proto);
1850                 psmouse_initialize(psmouse);
1851                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1852
1853                 return error;
1854         }
1855
1856         input_unregister_device(old_dev);
1857
1858         if (parent && parent->pt_activate)
1859                 parent->pt_activate(parent);
1860
1861         return count;
1862 }
1863
1864 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1865 {
1866         unsigned int value;
1867         int err;
1868
1869         err = kstrtouint(buf, 10, &value);
1870         if (err)
1871                 return err;
1872
1873         psmouse->set_rate(psmouse, value);
1874         return count;
1875 }
1876
1877 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1878 {
1879         unsigned int value;
1880         int err;
1881
1882         err = kstrtouint(buf, 10, &value);
1883         if (err)
1884                 return err;
1885
1886         psmouse->set_resolution(psmouse, value);
1887         return count;
1888 }
1889
1890
1891 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
1892 {
1893         const struct psmouse_protocol *proto;
1894
1895         if (!val)
1896                 return -EINVAL;
1897
1898         proto = psmouse_protocol_by_name(val, strlen(val));
1899
1900         if (!proto || !proto->maxproto)
1901                 return -EINVAL;
1902
1903         *((unsigned int *)kp->arg) = proto->type;
1904
1905         return 0;
1906 }
1907
1908 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
1909 {
1910         int type = *((unsigned int *)kp->arg);
1911
1912         return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
1913 }
1914
1915 static int __init psmouse_init(void)
1916 {
1917         int err;
1918
1919         lifebook_module_init();
1920         synaptics_module_init();
1921         hgpk_module_init();
1922
1923         kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
1924         if (!kpsmoused_wq) {
1925                 pr_err("failed to create kpsmoused workqueue\n");
1926                 return -ENOMEM;
1927         }
1928
1929         err = serio_register_driver(&psmouse_drv);
1930         if (err)
1931                 destroy_workqueue(kpsmoused_wq);
1932
1933         return err;
1934 }
1935
1936 static void __exit psmouse_exit(void)
1937 {
1938         serio_unregister_driver(&psmouse_drv);
1939         destroy_workqueue(kpsmoused_wq);
1940 }
1941
1942 module_init(psmouse_init);
1943 module_exit(psmouse_exit);