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 const struct attribute_group psmouse_attribute_group = {
 105         .attrs  = psmouse_attributes,
 106 };
 107
 108 /*
 109  * psmouse_mutex protects all operations changing state of mouse
 110  * (connecting, disconnecting, changing rate or resolution via
 111  * sysfs). We could use a per-device semaphore but since there
 112  * rarely more than one PS/2 mouse connected and since semaphore
 113  * is taken in "slow" paths it is not worth it.
 114  */
 115 static DEFINE_MUTEX(psmouse_mutex);
 116
 117 static struct workqueue_struct *kpsmoused_wq;
 118
 119 static void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
 120 {
 121         input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
 122         input_report_key(dev, BTN_MIDDLE, buttons & BIT(2));
 123         input_report_key(dev, BTN_RIGHT,  buttons & BIT(1));
 124 }
 125
 126 /*
 127  * psmouse_process_byte() analyzes the PS/2 data stream and reports
 128  * relevant events to the input module once full packet has arrived.
 129  */
 130 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 131 {
 132         struct input_dev *dev = psmouse->dev;
 133         unsigned char *packet = psmouse->packet;
 134
 135         if (psmouse->pktcnt < psmouse->pktsize)
 136                 return PSMOUSE_GOOD_DATA;
 137
 138         /* Full packet accumulated, process it */
 139
 140         switch (psmouse->protocol->type) {
 141         case PSMOUSE_IMPS:
 142                 /* IntelliMouse has scroll wheel */
 143                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 144                 break;
 145
 146         case PSMOUSE_IMEX:
 147                 /* Scroll wheel and buttons on IntelliMouse Explorer */
 148                 switch (packet[3] & 0xC0) {
 149                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
 150                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 151                         break;
 152                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
 153                         input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
 154                         break;
 155                 case 0x00:
 156                 case 0xC0:
 157                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
 158                         input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
 159                         input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
 160                         break;
 161                 }
 162                 break;
 163
 164         case PSMOUSE_GENPS:
 165                 /* Report scroll buttons on NetMice */
 166                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
 167
 168                 /* Extra buttons on Genius NewNet 3D */
 169                 input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
 170                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
 171                 break;
 172
 173         case PSMOUSE_THINKPS:
 174                 /* Extra button on ThinkingMouse */
 175                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
 176
 177                 /*
 178                  * Without this bit of weirdness moving up gives wildly
 179                  * high Y changes.
 180                  */
 181                 packet[1] |= (packet[0] & 0x40) << 1;
 182                 break;
 183
 184         case PSMOUSE_CORTRON:
 185                 /*
 186                  * Cortron PS2 Trackball reports SIDE button in the
 187                  * 4th bit of the first byte.
 188                  */
 189                 input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
 190                 packet[0] |= 0x08;
 191                 break;
 192
 193         default:
 194                 break;
 195         }
 196
 197         /* Generic PS/2 Mouse */
 198         psmouse_report_standard_buttons(dev,
 199                                         packet[0] | psmouse->extra_buttons);
 200
 201         input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
 202         input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
 203
 204         input_sync(dev);
 205
 206         return PSMOUSE_FULL_PACKET;
 207 }
 208
 209 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
 210                 unsigned long delay)
 211 {
 212         queue_delayed_work(kpsmoused_wq, work, delay);
 213 }
 214
 215 /*
 216  * __psmouse_set_state() sets new psmouse state and resets all flags.
 217  */
 218 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 219 {
 220         psmouse->state = new_state;
 221         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
 222         psmouse->ps2dev.flags = 0;
 223         psmouse->last = jiffies;
 224 }
 225
 226 /*
 227  * psmouse_set_state() sets new psmouse state and resets all flags and
 228  * counters while holding serio lock so fighting with interrupt handler
 229  * is not a concern.
 230  */
 231 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
 232 {
 233         serio_pause_rx(psmouse->ps2dev.serio);
 234         __psmouse_set_state(psmouse, new_state);
 235         serio_continue_rx(psmouse->ps2dev.serio);
 236 }
 237
 238 /*
 239  * psmouse_handle_byte() processes one byte of the input data stream
 240  * by calling corresponding protocol handler.
 241  */
 242 static int psmouse_handle_byte(struct psmouse *psmouse)
 243 {
 244         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
 245
 246         switch (rc) {
 247         case PSMOUSE_BAD_DATA:
 248                 if (psmouse->state == PSMOUSE_ACTIVATED) {
 249                         psmouse_warn(psmouse,
 250                                      "%s at %s lost sync at byte %d\n",
 251                                      psmouse->name, psmouse->phys,
 252                                      psmouse->pktcnt);
 253                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
 254                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 255                                 psmouse_notice(psmouse,
 256                                                 "issuing reconnect request\n");
 257                                 serio_reconnect(psmouse->ps2dev.serio);
 258                                 return -1;
 259                         }
 260                 }
 261                 psmouse->pktcnt = 0;
 262                 break;
 263
 264         case PSMOUSE_FULL_PACKET:
 265                 psmouse->pktcnt = 0;
 266                 if (psmouse->out_of_sync_cnt) {
 267                         psmouse->out_of_sync_cnt = 0;
 268                         psmouse_notice(psmouse,
 269                                         "%s at %s - driver resynced.\n",
 270                                         psmouse->name, psmouse->phys);
 271                 }
 272                 break;
 273
 274         case PSMOUSE_GOOD_DATA:
 275                 break;
 276         }
 277         return 0;
 278 }
 279
 280 static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
 281 {
 282         switch (psmouse->oob_data_type) {
 283         case PSMOUSE_OOB_NONE:
 284                 psmouse->oob_data_type = data;
 285                 break;
 286
 287         case PSMOUSE_OOB_EXTRA_BTNS:
 288                 psmouse_report_standard_buttons(psmouse->dev, data);
 289                 input_sync(psmouse->dev);
 290
 291                 psmouse->extra_buttons = data;
 292                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 293                 break;
 294
 295         default:
 296                 psmouse_warn(psmouse,
 297                              "unknown OOB_DATA type: 0x%02x\n",
 298                              psmouse->oob_data_type);
 299                 psmouse->oob_data_type = PSMOUSE_OOB_NONE;
 300                 break;
 301         }
 302 }
 303
 304 /*
 305  * psmouse_interrupt() handles incoming characters, either passing them
 306  * for normal processing or gathering them as command response.
 307  */
 308 static irqreturn_t psmouse_interrupt(struct serio *serio,
 309                 unsigned char data, unsigned int flags)
 310 {
 311         struct psmouse *psmouse = serio_get_drvdata(serio);
 312
 313         if (psmouse->state == PSMOUSE_IGNORE)
 314                 goto out;
 315
 316         if (unlikely((flags & SERIO_TIMEOUT) ||
 317                      ((flags & SERIO_PARITY) &&
 318                       !psmouse->protocol->ignore_parity))) {
 319
 320                 if (psmouse->state == PSMOUSE_ACTIVATED)
 321                         psmouse_warn(psmouse,
 322                                      "bad data from KBC -%s%s\n",
 323                                      flags & SERIO_TIMEOUT ? " timeout" : "",
 324                                      flags & SERIO_PARITY ? " bad parity" : "");
 325                 ps2_cmd_aborted(&psmouse->ps2dev);
 326                 goto out;
 327         }
 328
 329         if (flags & SERIO_OOB_DATA) {
 330                 psmouse_handle_oob_data(psmouse, data);
 331                 goto out;
 332         }
 333
 334         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
 335                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
 336                         goto out;
 337
 338         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
 339                 if  (ps2_handle_response(&psmouse->ps2dev, data))
 340                         goto out;
 341
 342         if (psmouse->state <= PSMOUSE_RESYNCING)
 343                 goto out;
 344
 345         if (psmouse->state == PSMOUSE_ACTIVATED &&
 346             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
 347                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
 348                              psmouse->name, psmouse->phys, psmouse->pktcnt);
 349                 psmouse->badbyte = psmouse->packet[0];
 350                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 351                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 352                 goto out;
 353         }
 354
 355         psmouse->packet[psmouse->pktcnt++] = data;
 356
 357         /* Check if this is a new device announcement (0xAA 0x00) */
 358         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
 359                 if (psmouse->pktcnt == 1) {
 360                         psmouse->last = jiffies;
 361                         goto out;
 362                 }
 363
 364                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
 365                     (psmouse->protocol->type == PSMOUSE_HGPK &&
 366                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 367                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 368                         serio_reconnect(serio);
 369                         goto out;
 370                 }
 371
 372                 /* Not a new device, try processing first byte normally */
 373                 psmouse->pktcnt = 1;
 374                 if (psmouse_handle_byte(psmouse))
 375                         goto out;
 376
 377                 psmouse->packet[psmouse->pktcnt++] = data;
 378         }
 379
 380         /*
 381          * See if we need to force resync because mouse was idle for
 382          * too long.
 383          */
 384         if (psmouse->state == PSMOUSE_ACTIVATED &&
 385             psmouse->pktcnt == 1 && psmouse->resync_time &&
 386             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
 387                 psmouse->badbyte = psmouse->packet[0];
 388                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
 389                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
 390                 goto out;
 391         }
 392
 393         psmouse->last = jiffies;
 394         psmouse_handle_byte(psmouse);
 395
 396  out:
 397         return IRQ_HANDLED;
 398 }
 399
 400 /*
 401  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
 402  * using sliced syntax, understood by advanced devices, such as Logitech
 403  * or Synaptics touchpads. The command is encoded as:
 404  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
 405  * is the command.
 406  */
 407 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
 408 {
 409         int i;
 410
 411         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
 412                 return -1;
 413
 414         for (i = 6; i >= 0; i -= 2) {
 415                 unsigned char d = (command >> i) & 3;
 416                 if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
 417                         return -1;
 418         }
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * psmouse_reset() resets the mouse into power-on state.
 425  */
 426 int psmouse_reset(struct psmouse *psmouse)
 427 {
 428         unsigned char param[2];
 429
 430         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
 431                 return -1;
 432
 433         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
 434                 return -1;
 435
 436         return 0;
 437 }
 438
 439 /*
 440  * Here we set the mouse resolution.
 441  */
 442 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 443 {
 444         static const unsigned char params[] = { 0, 1, 2, 2, 3 };
 445         unsigned char p;
 446
 447         if (resolution == 0 || resolution > 200)
 448                 resolution = 200;
 449
 450         p = params[resolution / 50];
 451         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
 452         psmouse->resolution = 25 << p;
 453 }
 454
 455 /*
 456  * Here we set the mouse report rate.
 457  */
 458 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
 459 {
 460         static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
 461         unsigned char r;
 462         int i = 0;
 463
 464         while (rates[i] > rate) i++;
 465         r = rates[i];
 466         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
 467         psmouse->rate = r;
 468 }
 469
 470 /*
 471  * Here we set the mouse scaling.
 472  */
 473 static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
 474 {
 475         ps2_command(&psmouse->ps2dev, NULL,
 476                     scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
 477                                                PSMOUSE_CMD_SETSCALE11);
 478 }
 479
 480 /*
 481  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
 482  */
 483 static int psmouse_poll(struct psmouse *psmouse)
 484 {
 485         return ps2_command(&psmouse->ps2dev, psmouse->packet,
 486                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
 487 }
 488
 489 static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
 490 {
 491         int i;
 492
 493         for (i = 0; ids[i]; i++)
 494                 if (!strcasecmp(id, ids[i]))
 495                         return true;
 496
 497         return false;
 498 }
 499
 500 /*
 501  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
 502  */
 503 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 504 {
 505         struct serio *serio = psmouse->ps2dev.serio;
 506         char *p, *fw_id_copy, *save_ptr;
 507         bool found = false;
 508
 509         if (strncmp(serio->firmware_id, "PNP: ", 5))
 510                 return false;
 511
 512         fw_id_copy = kstrndup(&serio->firmware_id[5],
 513                               sizeof(serio->firmware_id) - 5,
 514                               GFP_KERNEL);
 515         if (!fw_id_copy)
 516                 return false;
 517
 518         save_ptr = fw_id_copy;
 519         while ((p = strsep(&fw_id_copy, " ")) != NULL) {
 520                 if (psmouse_check_pnp_id(p, ids)) {
 521                         found = true;
 522                         break;
 523                 }
 524         }
 525
 526         kfree(save_ptr);
 527         return found;
 528 }
 529
 530 /*
 531  * Genius NetMouse magic init.
 532  */
 533 static int genius_detect(struct psmouse *psmouse, bool set_properties)
 534 {
 535         struct ps2dev *ps2dev = &psmouse->ps2dev;
 536         unsigned char param[4];
 537
 538         param[0] = 3;
 539         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 540         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 541         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 542         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
 543         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 544
 545         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
 546                 return -1;
 547
 548         if (set_properties) {
 549                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 550                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 551                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 552                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 553
 554                 psmouse->vendor = "Genius";
 555                 psmouse->name = "Mouse";
 556                 psmouse->pktsize = 4;
 557         }
 558
 559         return 0;
 560 }
 561
 562 /*
 563  * IntelliMouse magic init.
 564  */
 565 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
 566 {
 567         struct ps2dev *ps2dev = &psmouse->ps2dev;
 568         unsigned char param[2];
 569
 570         param[0] = 200;
 571         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 572         param[0] = 100;
 573         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 574         param[0] =  80;
 575         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 576         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 577
 578         if (param[0] != 3)
 579                 return -1;
 580
 581         if (set_properties) {
 582                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 583                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 584
 585                 if (!psmouse->vendor)
 586                         psmouse->vendor = "Generic";
 587                 if (!psmouse->name)
 588                         psmouse->name = "Wheel Mouse";
 589                 psmouse->pktsize = 4;
 590         }
 591
 592         return 0;
 593 }
 594
 595 /*
 596  * Try IntelliMouse/Explorer magic init.
 597  */
 598 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
 599 {
 600         struct ps2dev *ps2dev = &psmouse->ps2dev;
 601         unsigned char param[2];
 602
 603         intellimouse_detect(psmouse, 0);
 604
 605         param[0] = 200;
 606         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 607         param[0] = 200;
 608         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 609         param[0] =  80;
 610         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 611         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 612
 613         if (param[0] != 4)
 614                 return -1;
 615
 616         /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
 617         param[0] = 200;
 618         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 619         param[0] =  80;
 620         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 621         param[0] =  40;
 622         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 623
 624         if (set_properties) {
 625                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 626                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
 627                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
 628                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 629                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 630
 631                 if (!psmouse->vendor)
 632                         psmouse->vendor = "Generic";
 633                 if (!psmouse->name)
 634                         psmouse->name = "Explorer Mouse";
 635                 psmouse->pktsize = 4;
 636         }
 637
 638         return 0;
 639 }
 640
 641 /*
 642  * Kensington ThinkingMouse / ExpertMouse magic init.
 643  */
 644 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
 645 {
 646         struct ps2dev *ps2dev = &psmouse->ps2dev;
 647         unsigned char param[2];
 648         static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
 649         int i;
 650
 651         param[0] = 10;
 652         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 653         param[0] = 0;
 654         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 655         for (i = 0; i < ARRAY_SIZE(seq); i++) {
 656                 param[0] = seq[i];
 657                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
 658         }
 659         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
 660
 661         if (param[0] != 2)
 662                 return -1;
 663
 664         if (set_properties) {
 665                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 666                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
 667
 668                 psmouse->vendor = "Kensington";
 669                 psmouse->name = "ThinkingMouse";
 670         }
 671
 672         return 0;
 673 }
 674
 675 /*
 676  * Bare PS/2 protocol "detection". Always succeeds.
 677  */
 678 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
 679 {
 680         if (set_properties) {
 681                 if (!psmouse->vendor)
 682                         psmouse->vendor = "Generic";
 683                 if (!psmouse->name)
 684                         psmouse->name = "Mouse";
 685
 686                 /*
 687                  * We have no way of figuring true number of buttons so let's
 688                  * assume that the device has 3.
 689                  */
 690                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 691         }
 692
 693         return 0;
 694 }
 695
 696 /*
 697  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 698  * must be forced by sysfs protocol writing.
 699  */
 700 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
 701 {
 702         if (set_properties) {
 703                 psmouse->vendor = "Cortron";
 704                 psmouse->name = "PS/2 Trackball";
 705
 706                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
 707                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
 708         }
 709
 710         return 0;
 711 }
 712
 713 static const struct psmouse_protocol psmouse_protocols[] = {
 714         {
 715                 .type           = PSMOUSE_PS2,
 716                 .name           = "PS/2",
 717                 .alias          = "bare",
 718                 .maxproto       = true,
 719                 .ignore_parity  = true,
 720                 .detect         = ps2bare_detect,
 721                 .try_passthru   = true,
 722         },
 723 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 724         {
 725                 .type           = PSMOUSE_PS2PP,
 726                 .name           = "PS2++",
 727                 .alias          = "logitech",
 728                 .detect         = ps2pp_detect,
 729         },
 730 #endif
 731         {
 732                 .type           = PSMOUSE_THINKPS,
 733                 .name           = "ThinkPS/2",
 734                 .alias          = "thinkps",
 735                 .detect         = thinking_detect,
 736         },
 737 #ifdef CONFIG_MOUSE_PS2_CYPRESS
 738         {
 739                 .type           = PSMOUSE_CYPRESS,
 740                 .name           = "CyPS/2",
 741                 .alias          = "cypress",
 742                 .detect         = cypress_detect,
 743                 .init           = cypress_init,
 744         },
 745 #endif
 746         {
 747                 .type           = PSMOUSE_GENPS,
 748                 .name           = "GenPS/2",
 749                 .alias          = "genius",
 750                 .detect         = genius_detect,
 751         },
 752         {
 753                 .type           = PSMOUSE_IMPS,
 754                 .name           = "ImPS/2",
 755                 .alias          = "imps",
 756                 .maxproto       = true,
 757                 .ignore_parity  = true,
 758                 .detect         = intellimouse_detect,
 759                 .try_passthru   = true,
 760         },
 761         {
 762                 .type           = PSMOUSE_IMEX,
 763                 .name           = "ImExPS/2",
 764                 .alias          = "exps",
 765                 .maxproto       = true,
 766                 .ignore_parity  = true,
 767                 .detect         = im_explorer_detect,
 768                 .try_passthru   = true,
 769         },
 770 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 771         {
 772                 .type           = PSMOUSE_SYNAPTICS,
 773                 .name           = "SynPS/2",
 774                 .alias          = "synaptics",
 775                 .detect         = synaptics_detect,
 776                 .init           = synaptics_init_absolute,
 777         },
 778         {
 779                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
 780                 .name           = "SynRelPS/2",
 781                 .alias          = "synaptics-relative",
 782                 .detect         = synaptics_detect,
 783                 .init           = synaptics_init_relative,
 784         },
 785 #endif
 786 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
 787         {
 788                 .type           = PSMOUSE_SYNAPTICS_SMBUS,
 789                 .name           = "SynSMBus",
 790                 .alias          = "synaptics-smbus",
 791                 .detect         = synaptics_detect,
 792                 .init           = synaptics_init_smbus,
 793                 .smbus_companion = true,
 794         },
 795 #endif
 796 #ifdef CONFIG_MOUSE_PS2_ALPS
 797         {
 798                 .type           = PSMOUSE_ALPS,
 799                 .name           = "AlpsPS/2",
 800                 .alias          = "alps",
 801                 .detect         = alps_detect,
 802                 .init           = alps_init,
 803         },
 804 #endif
 805 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
 806         {
 807                 .type           = PSMOUSE_LIFEBOOK,
 808                 .name           = "LBPS/2",
 809                 .alias          = "lifebook",
 810                 .detect         = lifebook_detect,
 811                 .init           = lifebook_init,
 812         },
 813 #endif
 814 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
 815         {
 816                 .type           = PSMOUSE_TRACKPOINT,
 817                 .name           = "TPPS/2",
 818                 .alias          = "trackpoint",
 819                 .detect         = trackpoint_detect,
 820                 .try_passthru   = true,
 821         },
 822 #endif
 823 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 824         {
 825                 .type           = PSMOUSE_TOUCHKIT_PS2,
 826                 .name           = "touchkitPS/2",
 827                 .alias          = "touchkit",
 828                 .detect         = touchkit_ps2_detect,
 829         },
 830 #endif
 831 #ifdef CONFIG_MOUSE_PS2_OLPC
 832         {
 833                 .type           = PSMOUSE_HGPK,
 834                 .name           = "OLPC HGPK",
 835                 .alias          = "hgpk",
 836                 .detect         = hgpk_detect,
 837         },
 838 #endif
 839 #ifdef CONFIG_MOUSE_PS2_ELANTECH
 840         {
 841                 .type           = PSMOUSE_ELANTECH,
 842                 .name           = "ETPS/2",
 843                 .alias          = "elantech",
 844                 .detect         = elantech_detect,
 845                 .init           = elantech_init,
 846         },
 847 #endif
 848 #ifdef CONFIG_MOUSE_PS2_SENTELIC
 849         {
 850                 .type           = PSMOUSE_FSP,
 851                 .name           = "FSPPS/2",
 852                 .alias          = "fsp",
 853                 .detect         = fsp_detect,
 854                 .init           = fsp_init,
 855         },
 856 #endif
 857         {
 858                 .type           = PSMOUSE_CORTRON,
 859                 .name           = "CortronPS/2",
 860                 .alias          = "cortps",
 861                 .detect         = cortron_detect,
 862         },
 863 #ifdef CONFIG_MOUSE_PS2_FOCALTECH
 864         {
 865                 .type           = PSMOUSE_FOCALTECH,
 866                 .name           = "FocalTechPS/2",
 867                 .alias          = "focaltech",
 868                 .detect         = focaltech_detect,
 869                 .init           = focaltech_init,
 870         },
 871 #endif
 872 #ifdef CONFIG_MOUSE_PS2_VMMOUSE
 873         {
 874                 .type           = PSMOUSE_VMMOUSE,
 875                 .name           = VMMOUSE_PSNAME,
 876                 .alias          = "vmmouse",
 877                 .detect         = vmmouse_detect,
 878                 .init           = vmmouse_init,
 879         },
 880 #endif
 881 #ifdef CONFIG_MOUSE_PS2_BYD
 882         {
 883                 .type           = PSMOUSE_BYD,
 884                 .name           = "BYDPS/2",
 885                 .alias          = "byd",
 886                 .detect         = byd_detect,
 887                 .init           = byd_init,
 888         },
 889 #endif
 890         {
 891                 .type           = PSMOUSE_AUTO,
 892                 .name           = "auto",
 893                 .alias          = "any",
 894                 .maxproto       = true,
 895         },
 896 };
 897
 898 static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
 899 {
 900         int i;
 901
 902         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
 903                 if (psmouse_protocols[i].type == type)
 904                         return &psmouse_protocols[i];
 905
 906         return NULL;
 907 }
 908
 909 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
 910 {
 911         const struct psmouse_protocol *proto;
 912
 913         proto = __psmouse_protocol_by_type(type);
 914         if (proto)
 915                 return proto;
 916
 917         WARN_ON(1);
 918         return &psmouse_protocols[0];
 919 }
 920
 921 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
 922 {
 923         const struct psmouse_protocol *p;
 924         int i;
 925
 926         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
 927                 p = &psmouse_protocols[i];
 928
 929                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
 930                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
 931                         return &psmouse_protocols[i];
 932         }
 933
 934         return NULL;
 935 }
 936
 937 /*
 938  * Apply default settings to the psmouse structure. Most of them will
 939  * be overridden by individual protocol initialization routines.
 940  */
 941 static void psmouse_apply_defaults(struct psmouse *psmouse)
 942 {
 943         struct input_dev *input_dev = psmouse->dev;
 944
 945         memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
 946         memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
 947         memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
 948         memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
 949         memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
 950
 951         __set_bit(EV_KEY, input_dev->evbit);
 952         __set_bit(EV_REL, input_dev->evbit);
 953
 954         __set_bit(BTN_LEFT, input_dev->keybit);
 955         __set_bit(BTN_RIGHT, input_dev->keybit);
 956
 957         __set_bit(REL_X, input_dev->relbit);
 958         __set_bit(REL_Y, input_dev->relbit);
 959
 960         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 961
 962         psmouse->protocol = &psmouse_protocols[0];
 963
 964         psmouse->set_rate = psmouse_set_rate;
 965         psmouse->set_resolution = psmouse_set_resolution;
 966         psmouse->set_scale = psmouse_set_scale;
 967         psmouse->poll = psmouse_poll;
 968         psmouse->protocol_handler = psmouse_process_byte;
 969         psmouse->pktsize = 3;
 970         psmouse->reconnect = NULL;
 971         psmouse->fast_reconnect = NULL;
 972         psmouse->disconnect = NULL;
 973         psmouse->cleanup = NULL;
 974         psmouse->pt_activate = NULL;
 975         psmouse->pt_deactivate = NULL;
 976 }
 977
 978 static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
 979                               struct psmouse *psmouse, bool allow_passthrough,
 980                               bool set_properties)
 981 {
 982         if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
 983             !allow_passthrough) {
 984                 return false;
 985         }
 986
 987         if (set_properties)
 988                 psmouse_apply_defaults(psmouse);
 989
 990         return detect(psmouse, set_properties) == 0;
 991 }
 992
 993 static bool psmouse_try_protocol(struct psmouse *psmouse,
 994                                  enum psmouse_type type,
 995                                  unsigned int *max_proto,
 996                                  bool set_properties, bool init_allowed)
 997 {
 998         const struct psmouse_protocol *proto;
 999
1000         proto = __psmouse_protocol_by_type(type);
1001         if (!proto)
1002                 return false;
1003
1004         if (!psmouse_do_detect(proto->detect, psmouse, proto->try_passthru,
1005                                set_properties))
1006                 return false;
1007
1008         if (set_properties && proto->init && init_allowed) {
1009                 if (proto->init(psmouse) != 0) {
1010                         /*
1011                          * We detected device, but init failed. Adjust
1012                          * max_proto so we only try standard protocols.
1013                          */
1014                         if (*max_proto > PSMOUSE_IMEX)
1015                                 *max_proto = PSMOUSE_IMEX;
1016
1017                         return false;
1018                 }
1019         }
1020
1021         return true;
1022 }
1023
1024 /*
1025  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
1026  * the mouse may have.
1027  */
1028 static int psmouse_extensions(struct psmouse *psmouse,
1029                               unsigned int max_proto, bool set_properties)
1030 {
1031         bool synaptics_hardware = false;
1032         int ret;
1033
1034         /*
1035          * Always check for focaltech, this is safe as it uses pnp-id
1036          * matching.
1037          */
1038         if (psmouse_do_detect(focaltech_detect,
1039                               psmouse, false, set_properties)) {
1040                 if (max_proto > PSMOUSE_IMEX &&
1041                     IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
1042                     (!set_properties || focaltech_init(psmouse) == 0)) {
1043                         return PSMOUSE_FOCALTECH;
1044                 }
1045                 /*
1046                  * Restrict psmouse_max_proto so that psmouse_initialize()
1047                  * does not try to reset rate and resolution, because even
1048                  * that upsets the device.
1049                  * This also causes us to basically fall through to basic
1050                  * protocol detection, where we fully reset the mouse,
1051                  * and set it up as bare PS/2 protocol device.
1052                  */
1053                 psmouse_max_proto = max_proto = PSMOUSE_PS2;
1054         }
1055
1056         /*
1057          * We always check for LifeBook because it does not disturb mouse
1058          * (it only checks DMI information).
1059          */
1060         if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
1061                                  set_properties, max_proto > PSMOUSE_IMEX))
1062                 return PSMOUSE_LIFEBOOK;
1063
1064         if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
1065                                  set_properties, max_proto > PSMOUSE_IMEX))
1066                 return PSMOUSE_VMMOUSE;
1067
1068         /*
1069          * Try Kensington ThinkingMouse (we try first, because Synaptics
1070          * probe upsets the ThinkingMouse).
1071          */
1072         if (max_proto > PSMOUSE_IMEX &&
1073             psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
1074                                  set_properties, true)) {
1075                 return PSMOUSE_THINKPS;
1076         }
1077
1078         /*
1079          * Try Synaptics TouchPad. Note that probing is done even if
1080          * Synaptics protocol support is disabled in config - we need to
1081          * know if it is Synaptics so we can reset it properly after
1082          * probing for IntelliMouse.
1083          */
1084         if (max_proto > PSMOUSE_PS2 &&
1085             psmouse_do_detect(synaptics_detect,
1086                               psmouse, false, set_properties)) {
1087                 synaptics_hardware = true;
1088
1089                 if (max_proto > PSMOUSE_IMEX) {
1090                         /*
1091                          * Try activating protocol, but check if support is
1092                          * enabled first, since we try detecting Synaptics
1093                          * even when protocol is disabled.
1094                          */
1095                         if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
1096                             IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
1097                                 if (!set_properties)
1098                                         return PSMOUSE_SYNAPTICS;
1099
1100                                 ret = synaptics_init(psmouse);
1101                                 if (ret >= 0)
1102                                         return ret;
1103                         }
1104
1105                         /*
1106                          * Some Synaptics touchpads can emulate extended
1107                          * protocols (like IMPS/2).  Unfortunately
1108                          * Logitech/Genius probes confuse some firmware
1109                          * versions so we'll have to skip them.
1110                          */
1111                         max_proto = PSMOUSE_IMEX;
1112                 }
1113
1114                 /*
1115                  * Make sure that touchpad is in relative mode, gestures
1116                  * (taps) are enabled.
1117                  */
1118                 synaptics_reset(psmouse);
1119         }
1120
1121         /*
1122          * Try Cypress Trackpad. We must try it before Finger Sensing Pad
1123          * because Finger Sensing Pad probe upsets some modules of Cypress
1124          * Trackpads.
1125          */
1126         if (max_proto > PSMOUSE_IMEX &&
1127             psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
1128                                  set_properties, true)) {
1129                 return PSMOUSE_CYPRESS;
1130         }
1131
1132         /* Try ALPS TouchPad */
1133         if (max_proto > PSMOUSE_IMEX) {
1134                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1135                 if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
1136                                          &max_proto, set_properties, true))
1137                         return PSMOUSE_ALPS;
1138         }
1139
1140         /* Try OLPC HGPK touchpad */
1141         if (max_proto > PSMOUSE_IMEX &&
1142             psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
1143                                  set_properties, true)) {
1144                 return PSMOUSE_HGPK;
1145         }
1146
1147         /* Try Elantech touchpad */
1148         if (max_proto > PSMOUSE_IMEX &&
1149             psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
1150                                  &max_proto, set_properties, true)) {
1151                 return PSMOUSE_ELANTECH;
1152         }
1153
1154         if (max_proto > PSMOUSE_IMEX) {
1155                 if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
1156                                          &max_proto, set_properties, true))
1157                         return PSMOUSE_GENPS;
1158
1159                 if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
1160                                          &max_proto, set_properties, true))
1161                         return PSMOUSE_PS2PP;
1162
1163                 if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
1164                                          &max_proto, set_properties, true))
1165                         return PSMOUSE_TRACKPOINT;
1166
1167                 if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
1168                                          &max_proto, set_properties, true))
1169                         return PSMOUSE_TOUCHKIT_PS2;
1170         }
1171
1172         /*
1173          * Try Finger Sensing Pad. We do it here because its probe upsets
1174          * Trackpoint devices (causing TP_READ_ID command to time out).
1175          */
1176         if (max_proto > PSMOUSE_IMEX &&
1177             psmouse_try_protocol(psmouse, PSMOUSE_FSP,
1178                                  &max_proto, set_properties, true)) {
1179                 return PSMOUSE_FSP;
1180         }
1181
1182         /*
1183          * Reset to defaults in case the device got confused by extended
1184          * protocol probes. Note that we follow up with full reset because
1185          * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
1186          */
1187         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1188         psmouse_reset(psmouse);
1189
1190         if (max_proto >= PSMOUSE_IMEX &&
1191             psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
1192                                  &max_proto, set_properties, true)) {
1193                 return PSMOUSE_IMEX;
1194         }
1195
1196         if (max_proto >= PSMOUSE_IMPS &&
1197             psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
1198                                  &max_proto, set_properties, true)) {
1199                 return PSMOUSE_IMPS;
1200         }
1201
1202         /*
1203          * Okay, all failed, we have a standard mouse here. The number of
1204          * the buttons is still a question, though. We assume 3.
1205          */
1206         psmouse_try_protocol(psmouse, PSMOUSE_PS2,
1207                              &max_proto, set_properties, true);
1208
1209         if (synaptics_hardware) {
1210                 /*
1211                  * We detected Synaptics hardware but it did not respond to
1212                  * IMPS/2 probes.  We need to reset the touchpad because if
1213                  * there is a track point on the pass through port it could
1214                  * get disabled while probing for protocol extensions.
1215                  */
1216                 psmouse_reset(psmouse);
1217         }
1218
1219         return PSMOUSE_PS2;
1220 }
1221
1222 /*
1223  * psmouse_probe() probes for a PS/2 mouse.
1224  */
1225 static int psmouse_probe(struct psmouse *psmouse)
1226 {
1227         struct ps2dev *ps2dev = &psmouse->ps2dev;
1228         unsigned char param[2];
1229
1230         /*
1231          * First, we check if it's a mouse. It should send 0x00 or 0x03 in
1232          * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1233          * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
1234          * subsequent ID queries, probably due to a firmware bug.
1235          */
1236         param[0] = 0xa5;
1237         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
1238                 return -1;
1239
1240         if (param[0] != 0x00 && param[0] != 0x03 &&
1241             param[0] != 0x04 && param[0] != 0xff)
1242                 return -1;
1243
1244         /*
1245          * Then we reset and disable the mouse so that it doesn't generate
1246          * events.
1247          */
1248         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
1249                 psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
1250                              ps2dev->serio->phys);
1251
1252         return 0;
1253 }
1254
1255 /*
1256  * psmouse_initialize() initializes the mouse to a sane state.
1257  */
1258 static void psmouse_initialize(struct psmouse *psmouse)
1259 {
1260         /*
1261          * We set the mouse report rate, resolution and scaling.
1262          */
1263         if (psmouse_max_proto != PSMOUSE_PS2) {
1264                 psmouse->set_rate(psmouse, psmouse->rate);
1265                 psmouse->set_resolution(psmouse, psmouse->resolution);
1266                 psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
1267         }
1268 }
1269
1270 /*
1271  * psmouse_activate() enables the mouse so that we get motion reports from it.
1272  */
1273 int psmouse_activate(struct psmouse *psmouse)
1274 {
1275         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1276                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1277                              psmouse->ps2dev.serio->phys);
1278                 return -1;
1279         }
1280
1281         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1282         return 0;
1283 }
1284
1285 /*
1286  * psmouse_deactivate() puts the mouse into poll mode so that we don't get
1287  * motion reports from it unless we explicitly request it.
1288  */
1289 int psmouse_deactivate(struct psmouse *psmouse)
1290 {
1291         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
1292                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
1293                              psmouse->ps2dev.serio->phys);
1294                 return -1;
1295         }
1296
1297         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1298         return 0;
1299 }
1300
1301 /*
1302  * psmouse_resync() attempts to re-validate current protocol.
1303  */
1304 static void psmouse_resync(struct work_struct *work)
1305 {
1306         struct psmouse *parent = NULL, *psmouse =
1307                 container_of(work, struct psmouse, resync_work.work);
1308         struct serio *serio = psmouse->ps2dev.serio;
1309         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1310         bool failed = false, enabled = false;
1311         int i;
1312
1313         mutex_lock(&psmouse_mutex);
1314
1315         if (psmouse->state != PSMOUSE_RESYNCING)
1316                 goto out;
1317
1318         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1319                 parent = serio_get_drvdata(serio->parent);
1320                 psmouse_deactivate(parent);
1321         }
1322
1323         /*
1324          * Some mice don't ACK commands sent while they are in the middle of
1325          * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1326          * instead of ps2_command() which would wait for 200ms for an ACK
1327          * that may never come.
1328          * As an additional quirk ALPS touchpads may not only forget to ACK
1329          * disable command but will stop reporting taps, so if we see that
1330          * mouse at least once ACKs disable we will do full reconnect if ACK
1331          * is missing.
1332          */
1333         psmouse->num_resyncs++;
1334
1335         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1336                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1337                         failed = true;
1338         } else
1339                 psmouse->acks_disable_command = true;
1340
1341         /*
1342          * Poll the mouse. If it was reset the packet will be shorter than
1343          * psmouse->pktsize and ps2_command will fail. We do not expect and
1344          * do not handle scenario when mouse "upgrades" its protocol while
1345          * disconnected since it would require additional delay. If we ever
1346          * see a mouse that does it we'll adjust the code.
1347          */
1348         if (!failed) {
1349                 if (psmouse->poll(psmouse))
1350                         failed = true;
1351                 else {
1352                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1353                         for (i = 0; i < psmouse->pktsize; i++) {
1354                                 psmouse->pktcnt++;
1355                                 rc = psmouse->protocol_handler(psmouse);
1356                                 if (rc != PSMOUSE_GOOD_DATA)
1357                                         break;
1358                         }
1359                         if (rc != PSMOUSE_FULL_PACKET)
1360                                 failed = true;
1361                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1362                 }
1363         }
1364
1365         /*
1366          * Now try to enable mouse. We try to do that even if poll failed
1367          * and also repeat our attempts 5 times, otherwise we may be left
1368          * out with disabled mouse.
1369          */
1370         for (i = 0; i < 5; i++) {
1371                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1372                         enabled = true;
1373                         break;
1374                 }
1375                 msleep(200);
1376         }
1377
1378         if (!enabled) {
1379                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1380                              psmouse->ps2dev.serio->phys);
1381                 failed = true;
1382         }
1383
1384         if (failed) {
1385                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1386                 psmouse_info(psmouse,
1387                              "resync failed, issuing reconnect request\n");
1388                 serio_reconnect(serio);
1389         } else
1390                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1391
1392         if (parent)
1393                 psmouse_activate(parent);
1394  out:
1395         mutex_unlock(&psmouse_mutex);
1396 }
1397
1398 /*
1399  * psmouse_cleanup() resets the mouse into power-on state.
1400  */
1401 static void psmouse_cleanup(struct serio *serio)
1402 {
1403         struct psmouse *psmouse = serio_get_drvdata(serio);
1404         struct psmouse *parent = NULL;
1405
1406         mutex_lock(&psmouse_mutex);
1407
1408         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1409                 parent = serio_get_drvdata(serio->parent);
1410                 psmouse_deactivate(parent);
1411         }
1412
1413         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1414
1415         /*
1416          * Disable stream mode so cleanup routine can proceed undisturbed.
1417          */
1418         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1419                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1420                              psmouse->ps2dev.serio->phys);
1421
1422         if (psmouse->cleanup)
1423                 psmouse->cleanup(psmouse);
1424
1425         /*
1426          * Reset the mouse to defaults (bare PS/2 protocol).
1427          */
1428         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1429
1430         /*
1431          * Some boxes, such as HP nx7400, get terribly confused if mouse
1432          * is not fully enabled before suspending/shutting down.
1433          */
1434         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1435
1436         if (parent) {
1437                 if (parent->pt_deactivate)
1438                         parent->pt_deactivate(parent);
1439
1440                 psmouse_activate(parent);
1441         }
1442
1443         mutex_unlock(&psmouse_mutex);
1444 }
1445
1446 /*
1447  * psmouse_disconnect() closes and frees.
1448  */
1449 static void psmouse_disconnect(struct serio *serio)
1450 {
1451         struct psmouse *psmouse = serio_get_drvdata(serio);
1452         struct psmouse *parent = NULL;
1453
1454         sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1455
1456         mutex_lock(&psmouse_mutex);
1457
1458         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1459
1460         /* make sure we don't have a resync in progress */
1461         mutex_unlock(&psmouse_mutex);
1462         flush_workqueue(kpsmoused_wq);
1463         mutex_lock(&psmouse_mutex);
1464
1465         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1466                 parent = serio_get_drvdata(serio->parent);
1467                 psmouse_deactivate(parent);
1468         }
1469
1470         if (psmouse->disconnect)
1471                 psmouse->disconnect(psmouse);
1472
1473         if (parent && parent->pt_deactivate)
1474                 parent->pt_deactivate(parent);
1475
1476         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1477
1478         serio_close(serio);
1479         serio_set_drvdata(serio, NULL);
1480
1481         if (psmouse->dev)
1482                 input_unregister_device(psmouse->dev);
1483
1484         kfree(psmouse);
1485
1486         if (parent)
1487                 psmouse_activate(parent);
1488
1489         mutex_unlock(&psmouse_mutex);
1490 }
1491
1492 static int psmouse_switch_protocol(struct psmouse *psmouse,
1493                                    const struct psmouse_protocol *proto)
1494 {
1495         const struct psmouse_protocol *selected_proto;
1496         struct input_dev *input_dev = psmouse->dev;
1497         enum psmouse_type type;
1498
1499         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1500
1501         if (proto && (proto->detect || proto->init)) {
1502                 psmouse_apply_defaults(psmouse);
1503
1504                 if (proto->detect && proto->detect(psmouse, true) < 0)
1505                         return -1;
1506
1507                 if (proto->init && proto->init(psmouse) < 0)
1508                         return -1;
1509
1510                 selected_proto = proto;
1511         } else {
1512                 type = psmouse_extensions(psmouse, psmouse_max_proto, true);
1513                 selected_proto = psmouse_protocol_by_type(type);
1514         }
1515
1516         psmouse->protocol = selected_proto;
1517
1518         /*
1519          * If mouse's packet size is 3 there is no point in polling the
1520          * device in hopes to detect protocol reset - we won't get less
1521          * than 3 bytes response anyhow.
1522          */
1523         if (psmouse->pktsize == 3)
1524                 psmouse->resync_time = 0;
1525
1526         /*
1527          * Some smart KVMs fake response to POLL command returning just
1528          * 3 bytes and messing up our resync logic, so if initial poll
1529          * fails we won't try polling the device anymore. Hopefully
1530          * such KVM will maintain initially selected protocol.
1531          */
1532         if (psmouse->resync_time && psmouse->poll(psmouse))
1533                 psmouse->resync_time = 0;
1534
1535         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1536                  selected_proto->name, psmouse->vendor, psmouse->name);
1537
1538         input_dev->name = psmouse->devname;
1539         input_dev->phys = psmouse->phys;
1540         input_dev->id.bustype = BUS_I8042;
1541         input_dev->id.vendor = 0x0002;
1542         input_dev->id.product = psmouse->protocol->type;
1543         input_dev->id.version = psmouse->model;
1544
1545         return 0;
1546 }
1547
1548 /*
1549  * psmouse_connect() is a callback from the serio module when
1550  * an unhandled serio port is found.
1551  */
1552 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1553 {
1554         struct psmouse *psmouse, *parent = NULL;
1555         struct input_dev *input_dev;
1556         int retval = 0, error = -ENOMEM;
1557
1558         mutex_lock(&psmouse_mutex);
1559
1560         /*
1561          * If this is a pass-through port deactivate parent so the device
1562          * connected to this port can be successfully identified
1563          */
1564         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1565                 parent = serio_get_drvdata(serio->parent);
1566                 psmouse_deactivate(parent);
1567         }
1568
1569         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1570         input_dev = input_allocate_device();
1571         if (!psmouse || !input_dev)
1572                 goto err_free;
1573
1574         ps2_init(&psmouse->ps2dev, serio);
1575         INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1576         psmouse->dev = input_dev;
1577         snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1578
1579         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1580
1581         serio_set_drvdata(serio, psmouse);
1582
1583         error = serio_open(serio, drv);
1584         if (error)
1585                 goto err_clear_drvdata;
1586
1587         /* give PT device some time to settle down before probing */
1588         if (serio->id.type == SERIO_PS_PSTHRU)
1589                 usleep_range(10000, 15000);
1590
1591         if (psmouse_probe(psmouse) < 0) {
1592                 error = -ENODEV;
1593                 goto err_close_serio;
1594         }
1595
1596         psmouse->rate = psmouse_rate;
1597         psmouse->resolution = psmouse_resolution;
1598         psmouse->resetafter = psmouse_resetafter;
1599         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1600         psmouse->smartscroll = psmouse_smartscroll;
1601
1602         psmouse_switch_protocol(psmouse, NULL);
1603
1604         if (!psmouse->protocol->smbus_companion) {
1605                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1606                 psmouse_initialize(psmouse);
1607
1608                 error = input_register_device(input_dev);
1609                 if (error)
1610                         goto err_protocol_disconnect;
1611         } else {
1612                 /* Smbus companion will be reporting events, not us. */
1613                 input_free_device(input_dev);
1614                 psmouse->dev = input_dev = NULL;
1615         }
1616
1617         if (parent && parent->pt_activate)
1618                 parent->pt_activate(parent);
1619
1620         error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1621         if (error)
1622                 goto err_pt_deactivate;
1623
1624         /*
1625          * PS/2 devices having SMBus companions should stay disabled
1626          * on PS/2 side, in order to have SMBus part operable.
1627          */
1628         if (!psmouse->protocol->smbus_companion)
1629                 psmouse_activate(psmouse);
1630
1631  out:
1632         /* If this is a pass-through port the parent needs to be re-activated */
1633         if (parent)
1634                 psmouse_activate(parent);
1635
1636         mutex_unlock(&psmouse_mutex);
1637         return retval;
1638
1639  err_pt_deactivate:
1640         if (parent && parent->pt_deactivate)
1641                 parent->pt_deactivate(parent);
1642         if (input_dev) {
1643                 input_unregister_device(input_dev);
1644                 input_dev = NULL; /* so we don't try to free it below */
1645         }
1646  err_protocol_disconnect:
1647         if (psmouse->disconnect)
1648                 psmouse->disconnect(psmouse);
1649         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1650  err_close_serio:
1651         serio_close(serio);
1652  err_clear_drvdata:
1653         serio_set_drvdata(serio, NULL);
1654  err_free:
1655         input_free_device(input_dev);
1656         kfree(psmouse);
1657
1658         retval = error;
1659         goto out;
1660 }
1661
1662 static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
1663 {
1664         struct psmouse *psmouse = serio_get_drvdata(serio);
1665         struct psmouse *parent = NULL;
1666         int (*reconnect_handler)(struct psmouse *);
1667         enum psmouse_type type;
1668         int rc = -1;
1669
1670         mutex_lock(&psmouse_mutex);
1671
1672         if (fast_reconnect) {
1673                 reconnect_handler = psmouse->fast_reconnect;
1674                 if (!reconnect_handler) {
1675                         rc = -ENOENT;
1676                         goto out_unlock;
1677                 }
1678         } else {
1679                 reconnect_handler = psmouse->reconnect;
1680         }
1681
1682         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1683                 parent = serio_get_drvdata(serio->parent);
1684                 psmouse_deactivate(parent);
1685         }
1686
1687         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1688
1689         if (reconnect_handler) {
1690                 if (reconnect_handler(psmouse))
1691                         goto out;
1692         } else {
1693                 psmouse_reset(psmouse);
1694
1695                 if (psmouse_probe(psmouse) < 0)
1696                         goto out;
1697
1698                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1699                 if (psmouse->protocol->type != type)
1700                         goto out;
1701         }
1702
1703         /*
1704          * OK, the device type (and capabilities) match the old one,
1705          * we can continue using it, complete initialization
1706          */
1707         if (!psmouse->protocol->smbus_companion) {
1708                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1709                 psmouse_initialize(psmouse);
1710         }
1711
1712         if (parent && parent->pt_activate)
1713                 parent->pt_activate(parent);
1714
1715         /*
1716          * PS/2 devices having SMBus companions should stay disabled
1717          * on PS/2 side, in order to have SMBus part operable.
1718          */
1719         if (!psmouse->protocol->smbus_companion)
1720                 psmouse_activate(psmouse);
1721
1722         rc = 0;
1723
1724 out:
1725         /* If this is a pass-through port the parent waits to be activated */
1726         if (parent)
1727                 psmouse_activate(parent);
1728
1729 out_unlock:
1730         mutex_unlock(&psmouse_mutex);
1731         return rc;
1732 }
1733
1734 static int psmouse_reconnect(struct serio *serio)
1735 {
1736         return __psmouse_reconnect(serio, false);
1737 }
1738
1739 static int psmouse_fast_reconnect(struct serio *serio)
1740 {
1741         return __psmouse_reconnect(serio, true);
1742 }
1743
1744 static struct serio_device_id psmouse_serio_ids[] = {
1745         {
1746                 .type   = SERIO_8042,
1747                 .proto  = SERIO_ANY,
1748                 .id     = SERIO_ANY,
1749                 .extra  = SERIO_ANY,
1750         },
1751         {
1752                 .type   = SERIO_PS_PSTHRU,
1753                 .proto  = SERIO_ANY,
1754                 .id     = SERIO_ANY,
1755                 .extra  = SERIO_ANY,
1756         },
1757         { 0 }
1758 };
1759
1760 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1761
1762 static struct serio_driver psmouse_drv = {
1763         .driver         = {
1764                 .name   = "psmouse",
1765         },
1766         .description    = DRIVER_DESC,
1767         .id_table       = psmouse_serio_ids,
1768         .interrupt      = psmouse_interrupt,
1769         .connect        = psmouse_connect,
1770         .reconnect      = psmouse_reconnect,
1771         .fast_reconnect = psmouse_fast_reconnect,
1772         .disconnect     = psmouse_disconnect,
1773         .cleanup        = psmouse_cleanup,
1774 };
1775
1776 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1777                                  char *buf)
1778 {
1779         struct serio *serio = to_serio_port(dev);
1780         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1781         struct psmouse *psmouse = serio_get_drvdata(serio);
1782
1783         if (psmouse->protocol->smbus_companion &&
1784                         devattr != &psmouse_attr_protocol.dattr)
1785                 return -ENOENT;
1786
1787         return attr->show(psmouse, attr->data, buf);
1788 }
1789
1790 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1791                                 const char *buf, size_t count)
1792 {
1793         struct serio *serio = to_serio_port(dev);
1794         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1795         struct psmouse *psmouse, *parent = NULL;
1796         int retval;
1797
1798         retval = mutex_lock_interruptible(&psmouse_mutex);
1799         if (retval)
1800                 goto out;
1801
1802         psmouse = serio_get_drvdata(serio);
1803
1804         if (psmouse->protocol->smbus_companion &&
1805                         devattr != &psmouse_attr_protocol.dattr) {
1806                 retval = -ENOENT;
1807                 goto out_unlock;
1808         }
1809
1810         if (attr->protect) {
1811                 if (psmouse->state == PSMOUSE_IGNORE) {
1812                         retval = -ENODEV;
1813                         goto out_unlock;
1814                 }
1815
1816                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1817                         parent = serio_get_drvdata(serio->parent);
1818                         psmouse_deactivate(parent);
1819                 }
1820
1821                 if (!psmouse->protocol->smbus_companion)
1822                         psmouse_deactivate(psmouse);
1823         }
1824
1825         retval = attr->set(psmouse, attr->data, buf, count);
1826
1827         if (attr->protect) {
1828                 if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
1829                         psmouse_activate(psmouse);
1830
1831                 if (parent)
1832                         psmouse_activate(parent);
1833         }
1834
1835  out_unlock:
1836         mutex_unlock(&psmouse_mutex);
1837  out:
1838         return retval;
1839 }
1840
1841 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1842 {
1843         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1844
1845         return sprintf(buf, "%u\n", *field);
1846 }
1847
1848 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1849 {
1850         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1851         unsigned int value;
1852         int err;
1853
1854         err = kstrtouint(buf, 10, &value);
1855         if (err)
1856                 return err;
1857
1858         *field = value;
1859
1860         return count;
1861 }
1862
1863 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1864 {
1865         return sprintf(buf, "%s\n", psmouse->protocol->name);
1866 }
1867
1868 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1869 {
1870         struct serio *serio = psmouse->ps2dev.serio;
1871         struct psmouse *parent = NULL;
1872         struct input_dev *old_dev, *new_dev;
1873         const struct psmouse_protocol *proto, *old_proto;
1874         int error;
1875         int retry = 0;
1876
1877         proto = psmouse_protocol_by_name(buf, count);
1878         if (!proto)
1879                 return -EINVAL;
1880
1881         if (psmouse->protocol == proto)
1882                 return count;
1883
1884         new_dev = input_allocate_device();
1885         if (!new_dev)
1886                 return -ENOMEM;
1887
1888         while (!list_empty(&serio->children)) {
1889                 if (++retry > 3) {
1890                         psmouse_warn(psmouse,
1891                                      "failed to destroy children ports, protocol change aborted.\n");
1892                         input_free_device(new_dev);
1893                         return -EIO;
1894                 }
1895
1896                 mutex_unlock(&psmouse_mutex);
1897                 serio_unregister_child_port(serio);
1898                 mutex_lock(&psmouse_mutex);
1899
1900                 if (serio->drv != &psmouse_drv) {
1901                         input_free_device(new_dev);
1902                         return -ENODEV;
1903                 }
1904
1905                 if (psmouse->protocol == proto) {
1906                         input_free_device(new_dev);
1907                         return count; /* switched by other thread */
1908                 }
1909         }
1910
1911         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1912                 parent = serio_get_drvdata(serio->parent);
1913                 if (parent->pt_deactivate)
1914                         parent->pt_deactivate(parent);
1915         }
1916
1917         old_dev = psmouse->dev;
1918         old_proto = psmouse->protocol;
1919
1920         if (psmouse->disconnect)
1921                 psmouse->disconnect(psmouse);
1922
1923         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1924
1925         psmouse->dev = new_dev;
1926         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1927
1928         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1929                 psmouse_reset(psmouse);
1930                 /* default to PSMOUSE_PS2 */
1931                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1932         }
1933
1934         psmouse_initialize(psmouse);
1935         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1936
1937         if (psmouse->protocol->smbus_companion) {
1938                 input_free_device(psmouse->dev);
1939                 psmouse->dev = NULL;
1940         } else {
1941                 error = input_register_device(psmouse->dev);
1942                 if (error) {
1943                         if (psmouse->disconnect)
1944                                 psmouse->disconnect(psmouse);
1945
1946                         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1947                         input_free_device(new_dev);
1948                         psmouse->dev = old_dev;
1949                         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1950                         psmouse_switch_protocol(psmouse, old_proto);
1951                         psmouse_initialize(psmouse);
1952                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1953
1954                         return error;
1955                 }
1956         }
1957
1958         if (old_dev)
1959                 input_unregister_device(old_dev);
1960
1961         if (parent && parent->pt_activate)
1962                 parent->pt_activate(parent);
1963
1964         return count;
1965 }
1966
1967 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1968 {
1969         unsigned int value;
1970         int err;
1971
1972         err = kstrtouint(buf, 10, &value);
1973         if (err)
1974                 return err;
1975
1976         psmouse->set_rate(psmouse, value);
1977         return count;
1978 }
1979
1980 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1981 {
1982         unsigned int value;
1983         int err;
1984
1985         err = kstrtouint(buf, 10, &value);
1986         if (err)
1987                 return err;
1988
1989         psmouse->set_resolution(psmouse, value);
1990         return count;
1991 }
1992
1993
1994 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
1995 {
1996         const struct psmouse_protocol *proto;
1997
1998         if (!val)
1999                 return -EINVAL;
2000
2001         proto = psmouse_protocol_by_name(val, strlen(val));
2002
2003         if (!proto || !proto->maxproto)
2004                 return -EINVAL;
2005
2006         *((unsigned int *)kp->arg) = proto->type;
2007
2008         return 0;
2009 }
2010
2011 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
2012 {
2013         int type = *((unsigned int *)kp->arg);
2014
2015         return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
2016 }
2017
2018 static int __init psmouse_init(void)
2019 {
2020         int err;
2021
2022         lifebook_module_init();
2023         synaptics_module_init();
2024         hgpk_module_init();
2025
2026         err = psmouse_smbus_module_init();
2027         if (err)
2028                 return err;
2029
2030         kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
2031         if (!kpsmoused_wq) {
2032                 pr_err("failed to create kpsmoused workqueue\n");
2033                 err = -ENOMEM;
2034                 goto err_smbus_exit;
2035         }
2036
2037         err = serio_register_driver(&psmouse_drv);
2038         if (err)
2039                 goto err_destroy_wq;
2040
2041         return 0;
2042
2043 err_destroy_wq:
2044         destroy_workqueue(kpsmoused_wq);
2045 err_smbus_exit:
2046         psmouse_smbus_module_exit();
2047         return err;
2048 }
2049
2050 static void __exit psmouse_exit(void)
2051 {
2052         serio_unregister_driver(&psmouse_drv);
2053         destroy_workqueue(kpsmoused_wq);
2054         psmouse_smbus_module_exit();
2055 }
2056
2057 module_init(psmouse_init);
2058 module_exit(psmouse_exit);