drivers/input/serio/i8042.c

   1 /*
   2  *  i8042 keyboard and mouse controller driver for Linux
   3  *
   4  *  Copyright (c) 1999-2004 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/module.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/ioport.h>
  17 #include <linux/init.h>
  18 #include <linux/serio.h>
  19 #include <linux/err.h>
  20 #include <linux/rcupdate.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/i8042.h>
  23
  24 #include <asm/io.h>
  25
  26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  27 MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
  28 MODULE_LICENSE("GPL");
  29
  30 static unsigned int i8042_nokbd;
  31 module_param_named(nokbd, i8042_nokbd, bool, 0);
  32 MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");
  33
  34 static unsigned int i8042_noaux;
  35 module_param_named(noaux, i8042_noaux, bool, 0);
  36 MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
  37
  38 static unsigned int i8042_nomux;
  39 module_param_named(nomux, i8042_nomux, bool, 0);
  40 MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing conrtoller is present.");
  41
  42 static unsigned int i8042_unlock;
  43 module_param_named(unlock, i8042_unlock, bool, 0);
  44 MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");
  45
  46 static unsigned int i8042_reset;
  47 module_param_named(reset, i8042_reset, bool, 0);
  48 MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");
  49
  50 static unsigned int i8042_direct;
  51 module_param_named(direct, i8042_direct, bool, 0);
  52 MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");
  53
  54 static unsigned int i8042_dumbkbd;
  55 module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
  56 MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");
  57
  58 static unsigned int i8042_noloop;
  59 module_param_named(noloop, i8042_noloop, bool, 0);
  60 MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");
  61
  62 static unsigned int i8042_blink_frequency = 500;
  63 module_param_named(panicblink, i8042_blink_frequency, uint, 0600);
  64 MODULE_PARM_DESC(panicblink, "Frequency with which keyboard LEDs should blink when kernel panics");
  65
  66 #ifdef CONFIG_X86
  67 static unsigned int i8042_dritek;
  68 module_param_named(dritek, i8042_dritek, bool, 0);
  69 MODULE_PARM_DESC(dritek, "Force enable the Dritek keyboard extension");
  70 #endif
  71
  72 #ifdef CONFIG_PNP
  73 static int i8042_nopnp;
  74 module_param_named(nopnp, i8042_nopnp, bool, 0);
  75 MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
  76 #endif
  77
  78 #define DEBUG
  79 #ifdef DEBUG
  80 static int i8042_debug;
  81 module_param_named(debug, i8042_debug, bool, 0600);
  82 MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
  83 #endif
  84
  85 #include "i8042.h"
  86
  87 static DEFINE_SPINLOCK(i8042_lock);
  88
  89 struct i8042_port {
  90         struct serio *serio;
  91         int irq;
  92         unsigned char exists;
  93         signed char mux;
  94 };
  95
  96 #define I8042_KBD_PORT_NO       0
  97 #define I8042_AUX_PORT_NO       1
  98 #define I8042_MUX_PORT_NO       2
  99 #define I8042_NUM_PORTS         (I8042_NUM_MUX_PORTS + 2)
 100
 101 static struct i8042_port i8042_ports[I8042_NUM_PORTS];
 102
 103 static unsigned char i8042_initial_ctr;
 104 static unsigned char i8042_ctr;
 105 static unsigned char i8042_mux_present;
 106 static unsigned char i8042_kbd_irq_registered;
 107 static unsigned char i8042_aux_irq_registered;
 108 static unsigned char i8042_suppress_kbd_ack;
 109 static struct platform_device *i8042_platform_device;
 110
 111 static irqreturn_t i8042_interrupt(int irq, void *dev_id);
 112
 113 /*
 114  * The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
 115  * be ready for reading values from it / writing values to it.
 116  * Called always with i8042_lock held.
 117  */
 118
 119 static int i8042_wait_read(void)
 120 {
 121         int i = 0;
 122
 123         while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
 124                 udelay(50);
 125                 i++;
 126         }
 127         return -(i == I8042_CTL_TIMEOUT);
 128 }
 129
 130 static int i8042_wait_write(void)
 131 {
 132         int i = 0;
 133
 134         while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
 135                 udelay(50);
 136                 i++;
 137         }
 138         return -(i == I8042_CTL_TIMEOUT);
 139 }
 140
 141 /*
 142  * i8042_flush() flushes all data that may be in the keyboard and mouse buffers
 143  * of the i8042 down the toilet.
 144  */
 145
 146 static int i8042_flush(void)
 147 {
 148         unsigned long flags;
 149         unsigned char data, str;
 150         int i = 0;
 151
 152         spin_lock_irqsave(&i8042_lock, flags);
 153
 154         while (((str = i8042_read_status()) & I8042_STR_OBF) && (i < I8042_BUFFER_SIZE)) {
 155                 udelay(50);
 156                 data = i8042_read_data();
 157                 i++;
 158                 dbg("%02x <- i8042 (flush, %s)", data,
 159                         str & I8042_STR_AUXDATA ? "aux" : "kbd");
 160         }
 161
 162         spin_unlock_irqrestore(&i8042_lock, flags);
 163
 164         return i;
 165 }
 166
 167 /*
 168  * i8042_command() executes a command on the i8042. It also sends the input
 169  * parameter(s) of the commands to it, and receives the output value(s). The
 170  * parameters are to be stored in the param array, and the output is placed
 171  * into the same array. The number of the parameters and output values is
 172  * encoded in bits 8-11 of the command number.
 173  */
 174
 175 static int __i8042_command(unsigned char *param, int command)
 176 {
 177         int i, error;
 178
 179         if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
 180                 return -1;
 181
 182         error = i8042_wait_write();
 183         if (error)
 184                 return error;
 185
 186         dbg("%02x -> i8042 (command)", command & 0xff);
 187         i8042_write_command(command & 0xff);
 188
 189         for (i = 0; i < ((command >> 12) & 0xf); i++) {
 190                 error = i8042_wait_write();
 191                 if (error)
 192                         return error;
 193                 dbg("%02x -> i8042 (parameter)", param[i]);
 194                 i8042_write_data(param[i]);
 195         }
 196
 197         for (i = 0; i < ((command >> 8) & 0xf); i++) {
 198                 error = i8042_wait_read();
 199                 if (error) {
 200                         dbg("     -- i8042 (timeout)");
 201                         return error;
 202                 }
 203
 204                 if (command == I8042_CMD_AUX_LOOP &&
 205                     !(i8042_read_status() & I8042_STR_AUXDATA)) {
 206                         dbg("     -- i8042 (auxerr)");
 207                         return -1;
 208                 }
 209
 210                 param[i] = i8042_read_data();
 211                 dbg("%02x <- i8042 (return)", param[i]);
 212         }
 213
 214         return 0;
 215 }
 216
 217 int i8042_command(unsigned char *param, int command)
 218 {
 219         unsigned long flags;
 220         int retval;
 221
 222         spin_lock_irqsave(&i8042_lock, flags);
 223         retval = __i8042_command(param, command);
 224         spin_unlock_irqrestore(&i8042_lock, flags);
 225
 226         return retval;
 227 }
 228 EXPORT_SYMBOL(i8042_command);
 229
 230 /*
 231  * i8042_kbd_write() sends a byte out through the keyboard interface.
 232  */
 233
 234 static int i8042_kbd_write(struct serio *port, unsigned char c)
 235 {
 236         unsigned long flags;
 237         int retval = 0;
 238
 239         spin_lock_irqsave(&i8042_lock, flags);
 240
 241         if (!(retval = i8042_wait_write())) {
 242                 dbg("%02x -> i8042 (kbd-data)", c);
 243                 i8042_write_data(c);
 244         }
 245
 246         spin_unlock_irqrestore(&i8042_lock, flags);
 247
 248         return retval;
 249 }
 250
 251 /*
 252  * i8042_aux_write() sends a byte out through the aux interface.
 253  */
 254
 255 static int i8042_aux_write(struct serio *serio, unsigned char c)
 256 {
 257         struct i8042_port *port = serio->port_data;
 258
 259         return i8042_command(&c, port->mux == -1 ?
 260                                         I8042_CMD_AUX_SEND :
 261                                         I8042_CMD_MUX_SEND + port->mux);
 262 }
 263
 264 /*
 265  * i8042_start() is called by serio core when port is about to finish
 266  * registering. It will mark port as existing so i8042_interrupt can
 267  * start sending data through it.
 268  */
 269 static int i8042_start(struct serio *serio)
 270 {
 271         struct i8042_port *port = serio->port_data;
 272
 273         port->exists = 1;
 274         mb();
 275         return 0;
 276 }
 277
 278 /*
 279  * i8042_stop() marks serio port as non-existing so i8042_interrupt
 280  * will not try to send data to the port that is about to go away.
 281  * The function is called by serio core as part of unregister procedure.
 282  */
 283 static void i8042_stop(struct serio *serio)
 284 {
 285         struct i8042_port *port = serio->port_data;
 286
 287         port->exists = 0;
 288
 289         /*
 290          * We synchronize with both AUX and KBD IRQs because there is
 291          * a (very unlikely) chance that AUX IRQ is raised for KBD port
 292          * and vice versa.
 293          */
 294         synchronize_irq(I8042_AUX_IRQ);
 295         synchronize_irq(I8042_KBD_IRQ);
 296         port->serio = NULL;
 297 }
 298
 299 /*
 300  * i8042_interrupt() is the most important function in this driver -
 301  * it handles the interrupts from the i8042, and sends incoming bytes
 302  * to the upper layers.
 303  */
 304
 305 static irqreturn_t i8042_interrupt(int irq, void *dev_id)
 306 {
 307         struct i8042_port *port;
 308         unsigned long flags;
 309         unsigned char str, data;
 310         unsigned int dfl;
 311         unsigned int port_no;
 312         int ret = 1;
 313
 314         spin_lock_irqsave(&i8042_lock, flags);
 315         str = i8042_read_status();
 316         if (unlikely(~str & I8042_STR_OBF)) {
 317                 spin_unlock_irqrestore(&i8042_lock, flags);
 318                 if (irq) dbg("Interrupt %d, without any data", irq);
 319                 ret = 0;
 320                 goto out;
 321         }
 322         data = i8042_read_data();
 323         spin_unlock_irqrestore(&i8042_lock, flags);
 324
 325         if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
 326                 static unsigned long last_transmit;
 327                 static unsigned char last_str;
 328
 329                 dfl = 0;
 330                 if (str & I8042_STR_MUXERR) {
 331                         dbg("MUX error, status is %02x, data is %02x", str, data);
 332 /*
 333  * When MUXERR condition is signalled the data register can only contain
 334  * 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
 335  * it is not always the case. Some KBCs also report 0xfc when there is
 336  * nothing connected to the port while others sometimes get confused which
 337  * port the data came from and signal error leaving the data intact. They
 338  * _do not_ revert to legacy mode (actually I've never seen KBC reverting
 339  * to legacy mode yet, when we see one we'll add proper handling).
 340  * Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
 341  * rest assume that the data came from the same serio last byte
 342  * was transmitted (if transmission happened not too long ago).
 343  */
 344
 345                         switch (data) {
 346                                 default:
 347                                         if (time_before(jiffies, last_transmit + HZ/10)) {
 348                                                 str = last_str;
 349                                                 break;
 350                                         }
 351                                         /* fall through - report timeout */
 352                                 case 0xfc:
 353                                 case 0xfd:
 354                                 case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
 355                                 case 0xff: dfl = SERIO_PARITY;  data = 0xfe; break;
 356                         }
 357                 }
 358
 359                 port_no = I8042_MUX_PORT_NO + ((str >> 6) & 3);
 360                 last_str = str;
 361                 last_transmit = jiffies;
 362         } else {
 363
 364                 dfl = ((str & I8042_STR_PARITY) ? SERIO_PARITY : 0) |
 365                       ((str & I8042_STR_TIMEOUT) ? SERIO_TIMEOUT : 0);
 366
 367                 port_no = (str & I8042_STR_AUXDATA) ?
 368                                 I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
 369         }
 370
 371         port = &i8042_ports[port_no];
 372
 373         dbg("%02x <- i8042 (interrupt, %d, %d%s%s)",
 374             data, port_no, irq,
 375             dfl & SERIO_PARITY ? ", bad parity" : "",
 376             dfl & SERIO_TIMEOUT ? ", timeout" : "");
 377
 378         if (unlikely(i8042_suppress_kbd_ack))
 379                 if (port_no == I8042_KBD_PORT_NO &&
 380                     (data == 0xfa || data == 0xfe)) {
 381                         i8042_suppress_kbd_ack--;
 382                         goto out;
 383                 }
 384
 385         if (likely(port->exists))
 386                 serio_interrupt(port->serio, data, dfl);
 387
 388  out:
 389         return IRQ_RETVAL(ret);
 390 }
 391
 392 /*
 393  * i8042_enable_kbd_port enables keybaord port on chip
 394  */
 395
 396 static int i8042_enable_kbd_port(void)
 397 {
 398         i8042_ctr &= ~I8042_CTR_KBDDIS;
 399         i8042_ctr |= I8042_CTR_KBDINT;
 400
 401         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
 402                 i8042_ctr &= ~I8042_CTR_KBDINT;
 403                 i8042_ctr |= I8042_CTR_KBDDIS;
 404                 printk(KERN_ERR "i8042.c: Failed to enable KBD port.\n");
 405                 return -EIO;
 406         }
 407
 408         return 0;
 409 }
 410
 411 /*
 412  * i8042_enable_aux_port enables AUX (mouse) port on chip
 413  */
 414
 415 static int i8042_enable_aux_port(void)
 416 {
 417         i8042_ctr &= ~I8042_CTR_AUXDIS;
 418         i8042_ctr |= I8042_CTR_AUXINT;
 419
 420         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
 421                 i8042_ctr &= ~I8042_CTR_AUXINT;
 422                 i8042_ctr |= I8042_CTR_AUXDIS;
 423                 printk(KERN_ERR "i8042.c: Failed to enable AUX port.\n");
 424                 return -EIO;
 425         }
 426
 427         return 0;
 428 }
 429
 430 /*
 431  * i8042_enable_mux_ports enables 4 individual AUX ports after
 432  * the controller has been switched into Multiplexed mode
 433  */
 434
 435 static int i8042_enable_mux_ports(void)
 436 {
 437         unsigned char param;
 438         int i;
 439
 440         for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
 441                 i8042_command(&param, I8042_CMD_MUX_PFX + i);
 442                 i8042_command(&param, I8042_CMD_AUX_ENABLE);
 443         }
 444
 445         return i8042_enable_aux_port();
 446 }
 447
 448 /*
 449  * i8042_set_mux_mode checks whether the controller has an active
 450  * multiplexor and puts the chip into Multiplexed (1) or Legacy (0) mode.
 451  */
 452
 453 static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
 454 {
 455
 456         unsigned char param;
 457 /*
 458  * Get rid of bytes in the queue.
 459  */
 460
 461         i8042_flush();
 462
 463 /*
 464  * Internal loopback test - send three bytes, they should come back from the
 465  * mouse interface, the last should be version.
 466  */
 467
 468         param = 0xf0;
 469         if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xf0)
 470                 return -1;
 471         param = mode ? 0x56 : 0xf6;
 472         if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != (mode ? 0x56 : 0xf6))
 473                 return -1;
 474         param = mode ? 0xa4 : 0xa5;
 475         if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == (mode ? 0xa4 : 0xa5))
 476                 return -1;
 477
 478         if (mux_version)
 479                 *mux_version = param;
 480
 481         return 0;
 482 }
 483
 484 /*
 485  * i8042_check_mux() checks whether the controller supports the PS/2 Active
 486  * Multiplexing specification by Synaptics, Phoenix, Insyde and
 487  * LCS/Telegraphics.
 488  */
 489
 490 static int __devinit i8042_check_mux(void)
 491 {
 492         unsigned char mux_version;
 493
 494         if (i8042_set_mux_mode(1, &mux_version))
 495                 return -1;
 496
 497 /*
 498  * Workaround for interference with USB Legacy emulation
 499  * that causes a v10.12 MUX to be found.
 500  */
 501         if (mux_version == 0xAC)
 502                 return -1;
 503
 504         printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
 505                 (mux_version >> 4) & 0xf, mux_version & 0xf);
 506
 507 /*
 508  * Disable all muxed ports by disabling AUX.
 509  */
 510         i8042_ctr |= I8042_CTR_AUXDIS;
 511         i8042_ctr &= ~I8042_CTR_AUXINT;
 512
 513         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
 514                 printk(KERN_ERR "i8042.c: Failed to disable AUX port, can't use MUX.\n");
 515                 return -EIO;
 516         }
 517
 518         i8042_mux_present = 1;
 519
 520         return 0;
 521 }
 522
 523 /*
 524  * The following is used to test AUX IRQ delivery.
 525  */
 526 static struct completion i8042_aux_irq_delivered __devinitdata;
 527 static int i8042_irq_being_tested __devinitdata;
 528
 529 static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
 530 {
 531         unsigned long flags;
 532         unsigned char str, data;
 533         int ret = 0;
 534
 535         spin_lock_irqsave(&i8042_lock, flags);
 536         str = i8042_read_status();
 537         if (str & I8042_STR_OBF) {
 538                 data = i8042_read_data();
 539                 if (i8042_irq_being_tested &&
 540                     data == 0xa5 && (str & I8042_STR_AUXDATA))
 541                         complete(&i8042_aux_irq_delivered);
 542                 ret = 1;
 543         }
 544         spin_unlock_irqrestore(&i8042_lock, flags);
 545
 546         return IRQ_RETVAL(ret);
 547 }
 548
 549 /*
 550  * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
 551  * verifies success by readinng CTR. Used when testing for presence of AUX
 552  * port.
 553  */
 554 static int __devinit i8042_toggle_aux(int on)
 555 {
 556         unsigned char param;
 557         int i;
 558
 559         if (i8042_command(&param,
 560                         on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
 561                 return -1;
 562
 563         /* some chips need some time to set the I8042_CTR_AUXDIS bit */
 564         for (i = 0; i < 100; i++) {
 565                 udelay(50);
 566
 567                 if (i8042_command(&param, I8042_CMD_CTL_RCTR))
 568                         return -1;
 569
 570                 if (!(param & I8042_CTR_AUXDIS) == on)
 571                         return 0;
 572         }
 573
 574         return -1;
 575 }
 576
 577 /*
 578  * i8042_check_aux() applies as much paranoia as it can at detecting
 579  * the presence of an AUX interface.
 580  */
 581
 582 static int __devinit i8042_check_aux(void)
 583 {
 584         int retval = -1;
 585         int irq_registered = 0;
 586         int aux_loop_broken = 0;
 587         unsigned long flags;
 588         unsigned char param;
 589
 590 /*
 591  * Get rid of bytes in the queue.
 592  */
 593
 594         i8042_flush();
 595
 596 /*
 597  * Internal loopback test - filters out AT-type i8042's. Unfortunately
 598  * SiS screwed up and their 5597 doesn't support the LOOP command even
 599  * though it has an AUX port.
 600  */
 601
 602         param = 0x5a;
 603         retval = i8042_command(&param, I8042_CMD_AUX_LOOP);
 604         if (retval || param != 0x5a) {
 605
 606 /*
 607  * External connection test - filters out AT-soldered PS/2 i8042's
 608  * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
 609  * 0xfa - no error on some notebooks which ignore the spec
 610  * Because it's common for chipsets to return error on perfectly functioning
 611  * AUX ports, we test for this only when the LOOP command failed.
 612  */
 613
 614                 if (i8042_command(&param, I8042_CMD_AUX_TEST) ||
 615                     (param && param != 0xfa && param != 0xff))
 616                         return -1;
 617
 618 /*
 619  * If AUX_LOOP completed without error but returned unexpected data
 620  * mark it as broken
 621  */
 622                 if (!retval)
 623                         aux_loop_broken = 1;
 624         }
 625
 626 /*
 627  * Bit assignment test - filters out PS/2 i8042's in AT mode
 628  */
 629
 630         if (i8042_toggle_aux(0)) {
 631                 printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
 632                 printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
 633         }
 634
 635         if (i8042_toggle_aux(1))
 636                 return -1;
 637
 638 /*
 639  * Test AUX IRQ delivery to make sure BIOS did not grab the IRQ and
 640  * used it for a PCI card or somethig else.
 641  */
 642
 643         if (i8042_noloop || aux_loop_broken) {
 644 /*
 645  * Without LOOP command we can't test AUX IRQ delivery. Assume the port
 646  * is working and hope we are right.
 647  */
 648                 retval = 0;
 649                 goto out;
 650         }
 651
 652         if (request_irq(I8042_AUX_IRQ, i8042_aux_test_irq, IRQF_SHARED,
 653                         "i8042", i8042_platform_device))
 654                 goto out;
 655
 656         irq_registered = 1;
 657
 658         if (i8042_enable_aux_port())
 659                 goto out;
 660
 661         spin_lock_irqsave(&i8042_lock, flags);
 662
 663         init_completion(&i8042_aux_irq_delivered);
 664         i8042_irq_being_tested = 1;
 665
 666         param = 0xa5;
 667         retval = __i8042_command(&param, I8042_CMD_AUX_LOOP & 0xf0ff);
 668
 669         spin_unlock_irqrestore(&i8042_lock, flags);
 670
 671         if (retval)
 672                 goto out;
 673
 674         if (wait_for_completion_timeout(&i8042_aux_irq_delivered,
 675                                         msecs_to_jiffies(250)) == 0) {
 676 /*
 677  * AUX IRQ was never delivered so we need to flush the controller to
 678  * get rid of the byte we put there; otherwise keyboard may not work.
 679  */
 680                 i8042_flush();
 681                 retval = -1;
 682         }
 683
 684  out:
 685
 686 /*
 687  * Disable the interface.
 688  */
 689
 690         i8042_ctr |= I8042_CTR_AUXDIS;
 691         i8042_ctr &= ~I8042_CTR_AUXINT;
 692
 693         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
 694                 retval = -1;
 695
 696         if (irq_registered)
 697                 free_irq(I8042_AUX_IRQ, i8042_platform_device);
 698
 699         return retval;
 700 }
 701
 702 static int i8042_controller_check(void)
 703 {
 704         if (i8042_flush() == I8042_BUFFER_SIZE) {
 705                 printk(KERN_ERR "i8042.c: No controller found.\n");
 706                 return -ENODEV;
 707         }
 708
 709         return 0;
 710 }
 711
 712 static int i8042_controller_selftest(void)
 713 {
 714         unsigned char param;
 715
 716         if (!i8042_reset)
 717                 return 0;
 718
 719         if (i8042_command(&param, I8042_CMD_CTL_TEST)) {
 720                 printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
 721                 return -ENODEV;
 722         }
 723
 724         if (param != I8042_RET_CTL_TEST) {
 725                 printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
 726                          param, I8042_RET_CTL_TEST);
 727                 return -EIO;
 728         }
 729
 730         return 0;
 731 }
 732
 733 /*
 734  * i8042_controller init initializes the i8042 controller, and,
 735  * most importantly, sets it into non-xlated mode if that's
 736  * desired.
 737  */
 738
 739 static int i8042_controller_init(void)
 740 {
 741         unsigned long flags;
 742
 743 /*
 744  * Save the CTR for restoral on unload / reboot.
 745  */
 746
 747         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
 748                 printk(KERN_ERR "i8042.c: Can't read CTR while initializing i8042.\n");
 749                 return -EIO;
 750         }
 751
 752         i8042_initial_ctr = i8042_ctr;
 753
 754 /*
 755  * Disable the keyboard interface and interrupt.
 756  */
 757
 758         i8042_ctr |= I8042_CTR_KBDDIS;
 759         i8042_ctr &= ~I8042_CTR_KBDINT;
 760
 761 /*
 762  * Handle keylock.
 763  */
 764
 765         spin_lock_irqsave(&i8042_lock, flags);
 766         if (~i8042_read_status() & I8042_STR_KEYLOCK) {
 767                 if (i8042_unlock)
 768                         i8042_ctr |= I8042_CTR_IGNKEYLOCK;
 769                 else
 770                         printk(KERN_WARNING "i8042.c: Warning: Keylock active.\n");
 771         }
 772         spin_unlock_irqrestore(&i8042_lock, flags);
 773
 774 /*
 775  * If the chip is configured into nontranslated mode by the BIOS, don't
 776  * bother enabling translating and be happy.
 777  */
 778
 779         if (~i8042_ctr & I8042_CTR_XLATE)
 780                 i8042_direct = 1;
 781
 782 /*
 783  * Set nontranslated mode for the kbd interface if requested by an option.
 784  * After this the kbd interface becomes a simple serial in/out, like the aux
 785  * interface is. We don't do this by default, since it can confuse notebook
 786  * BIOSes.
 787  */
 788
 789         if (i8042_direct)
 790                 i8042_ctr &= ~I8042_CTR_XLATE;
 791
 792 /*
 793  * Write CTR back.
 794  */
 795
 796         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
 797                 printk(KERN_ERR "i8042.c: Can't write CTR while initializing i8042.\n");
 798                 return -EIO;
 799         }
 800
 801         return 0;
 802 }
 803
 804
 805 /*
 806  * Reset the controller and reset CRT to the original value set by BIOS.
 807  */
 808
 809 static void i8042_controller_reset(void)
 810 {
 811         i8042_flush();
 812
 813 /*
 814  * Disable both KBD and AUX interfaces so they don't get in the way
 815  */
 816
 817         i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
 818         i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
 819
 820 /*
 821  * Disable MUX mode if present.
 822  */
 823
 824         if (i8042_mux_present)
 825                 i8042_set_mux_mode(0, NULL);
 826
 827 /*
 828  * Reset the controller if requested.
 829  */
 830
 831         i8042_controller_selftest();
 832
 833 /*
 834  * Restore the original control register setting.
 835  */
 836
 837         if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
 838                 printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
 839 }
 840
 841
 842 /*
 843  * i8042_panic_blink() will flash the keyboard LEDs and is called when
 844  * kernel panics. Flashing LEDs is useful for users running X who may
 845  * not see the console and will help distingushing panics from "real"
 846  * lockups.
 847  *
 848  * Note that DELAY has a limit of 10ms so we will not get stuck here
 849  * waiting for KBC to free up even if KBD interrupt is off
 850  */
 851
 852 #define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)
 853
 854 static long i8042_panic_blink(long count)
 855 {
 856         long delay = 0;
 857         static long last_blink;
 858         static char led;
 859
 860         /*
 861          * We expect frequency to be about 1/2s. KDB uses about 1s.
 862          * Make sure they are different.
 863          */
 864         if (!i8042_blink_frequency)
 865                 return 0;
 866         if (count - last_blink < i8042_blink_frequency)
 867                 return 0;
 868
 869         led ^= 0x01 | 0x04;
 870         while (i8042_read_status() & I8042_STR_IBF)
 871                 DELAY;
 872         dbg("%02x -> i8042 (panic blink)", 0xed);
 873         i8042_suppress_kbd_ack = 2;
 874         i8042_write_data(0xed); /* set leds */
 875         DELAY;
 876         while (i8042_read_status() & I8042_STR_IBF)
 877                 DELAY;
 878         DELAY;
 879         dbg("%02x -> i8042 (panic blink)", led);
 880         i8042_write_data(led);
 881         DELAY;
 882         last_blink = count;
 883         return delay;
 884 }
 885
 886 #undef DELAY
 887
 888 #ifdef CONFIG_PM
 889 /*
 890  * Here we try to restore the original BIOS settings. We only want to
 891  * do that once, when we really suspend, not when we taking memory
 892  * snapshot for swsusp (in this case we'll perform required cleanup
 893  * as part of shutdown process).
 894  */
 895
 896 static int i8042_suspend(struct platform_device *dev, pm_message_t state)
 897 {
 898         if (dev->dev.power.power_state.event != state.event) {
 899                 if (state.event == PM_EVENT_SUSPEND)
 900                         i8042_controller_reset();
 901
 902                 dev->dev.power.power_state = state;
 903         }
 904
 905         return 0;
 906 }
 907
 908
 909 /*
 910  * Here we try to reset everything back to a state in which suspended
 911  */
 912
 913 static int i8042_resume(struct platform_device *dev)
 914 {
 915         int error;
 916
 917 /*
 918  * Do not bother with restoring state if we haven't suspened yet
 919  */
 920         if (dev->dev.power.power_state.event == PM_EVENT_ON)
 921                 return 0;
 922
 923         error = i8042_controller_check();
 924         if (error)
 925                 return error;
 926
 927         error = i8042_controller_selftest();
 928         if (error)
 929                 return error;
 930
 931 /*
 932  * Restore original CTR value and disable all ports
 933  */
 934
 935         i8042_ctr = i8042_initial_ctr;
 936         if (i8042_direct)
 937                 i8042_ctr &= ~I8042_CTR_XLATE;
 938         i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
 939         i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
 940         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
 941                 printk(KERN_ERR "i8042: Can't write CTR to resume\n");
 942                 return -EIO;
 943         }
 944
 945         if (i8042_mux_present) {
 946                 if (i8042_set_mux_mode(1, NULL) || i8042_enable_mux_ports())
 947                         printk(KERN_WARNING
 948                                 "i8042: failed to resume active multiplexor, "
 949                                 "mouse won't work.\n");
 950         } else if (i8042_ports[I8042_AUX_PORT_NO].serio)
 951                 i8042_enable_aux_port();
 952
 953         if (i8042_ports[I8042_KBD_PORT_NO].serio)
 954                 i8042_enable_kbd_port();
 955
 956         i8042_interrupt(0, NULL);
 957
 958         dev->dev.power.power_state = PMSG_ON;
 959
 960         return 0;
 961 }
 962 #endif /* CONFIG_PM */
 963
 964 /*
 965  * We need to reset the 8042 back to original mode on system shutdown,
 966  * because otherwise BIOSes will be confused.
 967  */
 968
 969 static void i8042_shutdown(struct platform_device *dev)
 970 {
 971         i8042_controller_reset();
 972 }
 973
 974 static int __devinit i8042_create_kbd_port(void)
 975 {
 976         struct serio *serio;
 977         struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];
 978
 979         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 980         if (!serio)
 981                 return -ENOMEM;
 982
 983         serio->id.type          = i8042_direct ? SERIO_8042 : SERIO_8042_XL;
 984         serio->write            = i8042_dumbkbd ? NULL : i8042_kbd_write;
 985         serio->start            = i8042_start;
 986         serio->stop             = i8042_stop;
 987         serio->port_data        = port;
 988         serio->dev.parent       = &i8042_platform_device->dev;
 989         strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
 990         strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));
 991
 992         port->serio = serio;
 993         port->irq = I8042_KBD_IRQ;
 994
 995         return 0;
 996 }
 997
 998 static int __devinit i8042_create_aux_port(int idx)
 999 {
1000         struct serio *serio;
1001         int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
1002         struct i8042_port *port = &i8042_ports[port_no];
1003
1004         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
1005         if (!serio)
1006                 return -ENOMEM;
1007
1008         serio->id.type          = SERIO_8042;
1009         serio->write            = i8042_aux_write;
1010         serio->start            = i8042_start;
1011         serio->stop             = i8042_stop;
1012         serio->port_data        = port;
1013         serio->dev.parent       = &i8042_platform_device->dev;
1014         if (idx < 0) {
1015                 strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
1016                 strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
1017         } else {
1018                 snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
1019                 snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
1020         }
1021
1022         port->serio = serio;
1023         port->mux = idx;
1024         port->irq = I8042_AUX_IRQ;
1025
1026         return 0;
1027 }
1028
1029 static void __devinit i8042_free_kbd_port(void)
1030 {
1031         kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
1032         i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
1033 }
1034
1035 static void __devinit i8042_free_aux_ports(void)
1036 {
1037         int i;
1038
1039         for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
1040                 kfree(i8042_ports[i].serio);
1041                 i8042_ports[i].serio = NULL;
1042         }
1043 }
1044
1045 static void __devinit i8042_register_ports(void)
1046 {
1047         int i;
1048
1049         for (i = 0; i < I8042_NUM_PORTS; i++) {
1050                 if (i8042_ports[i].serio) {
1051                         printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
1052                                 i8042_ports[i].serio->name,
1053                                 (unsigned long) I8042_DATA_REG,
1054                                 (unsigned long) I8042_COMMAND_REG,
1055                                 i8042_ports[i].irq);
1056                         serio_register_port(i8042_ports[i].serio);
1057                 }
1058         }
1059 }
1060
1061 static void __devexit i8042_unregister_ports(void)
1062 {
1063         int i;
1064
1065         for (i = 0; i < I8042_NUM_PORTS; i++) {
1066                 if (i8042_ports[i].serio) {
1067                         serio_unregister_port(i8042_ports[i].serio);
1068                         i8042_ports[i].serio = NULL;
1069                 }
1070         }
1071 }
1072
1073 static void i8042_free_irqs(void)
1074 {
1075         if (i8042_aux_irq_registered)
1076                 free_irq(I8042_AUX_IRQ, i8042_platform_device);
1077         if (i8042_kbd_irq_registered)
1078                 free_irq(I8042_KBD_IRQ, i8042_platform_device);
1079
1080         i8042_aux_irq_registered = i8042_kbd_irq_registered = 0;
1081 }
1082
1083 static int __devinit i8042_setup_aux(void)
1084 {
1085         int (*aux_enable)(void);
1086         int error;
1087         int i;
1088
1089         if (i8042_check_aux())
1090                 return -ENODEV;
1091
1092         if (i8042_nomux || i8042_check_mux()) {
1093                 error = i8042_create_aux_port(-1);
1094                 if (error)
1095                         goto err_free_ports;
1096                 aux_enable = i8042_enable_aux_port;
1097         } else {
1098                 for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
1099                         error = i8042_create_aux_port(i);
1100                         if (error)
1101                                 goto err_free_ports;
1102                 }
1103                 aux_enable = i8042_enable_mux_ports;
1104         }
1105
1106         error = request_irq(I8042_AUX_IRQ, i8042_interrupt, IRQF_SHARED,
1107                             "i8042", i8042_platform_device);
1108         if (error)
1109                 goto err_free_ports;
1110
1111         if (aux_enable())
1112                 goto err_free_irq;
1113
1114         i8042_aux_irq_registered = 1;
1115         return 0;
1116
1117  err_free_irq:
1118         free_irq(I8042_AUX_IRQ, i8042_platform_device);
1119  err_free_ports:
1120         i8042_free_aux_ports();
1121         return error;
1122 }
1123
1124 static int __devinit i8042_setup_kbd(void)
1125 {
1126         int error;
1127
1128         error = i8042_create_kbd_port();
1129         if (error)
1130                 return error;
1131
1132         error = request_irq(I8042_KBD_IRQ, i8042_interrupt, IRQF_SHARED,
1133                             "i8042", i8042_platform_device);
1134         if (error)
1135                 goto err_free_port;
1136
1137         error = i8042_enable_kbd_port();
1138         if (error)
1139                 goto err_free_irq;
1140
1141         i8042_kbd_irq_registered = 1;
1142         return 0;
1143
1144  err_free_irq:
1145         free_irq(I8042_KBD_IRQ, i8042_platform_device);
1146  err_free_port:
1147         i8042_free_kbd_port();
1148         return error;
1149 }
1150
1151 static int __devinit i8042_probe(struct platform_device *dev)
1152 {
1153         int error;
1154
1155         error = i8042_controller_selftest();
1156         if (error)
1157                 return error;
1158
1159         error = i8042_controller_init();
1160         if (error)
1161                 return error;
1162
1163         if (!i8042_noaux) {
1164                 error = i8042_setup_aux();
1165                 if (error && error != -ENODEV && error != -EBUSY)
1166                         goto out_fail;
1167         }
1168
1169         if (!i8042_nokbd) {
1170                 error = i8042_setup_kbd();
1171                 if (error)
1172                         goto out_fail;
1173         }
1174 #ifdef CONFIG_X86
1175         if (i8042_dritek) {
1176                 char param = 0x90;
1177                 error = i8042_command(&param, 0x1059);
1178                 if (error)
1179                         goto out_fail;
1180         }
1181 #endif
1182 /*
1183  * Ok, everything is ready, let's register all serio ports
1184  */
1185         i8042_register_ports();
1186
1187         return 0;
1188
1189  out_fail:
1190         i8042_free_aux_ports(); /* in case KBD failed but AUX not */
1191         i8042_free_irqs();
1192         i8042_controller_reset();
1193
1194         return error;
1195 }
1196
1197 static int __devexit i8042_remove(struct platform_device *dev)
1198 {
1199         i8042_unregister_ports();
1200         i8042_free_irqs();
1201         i8042_controller_reset();
1202
1203         return 0;
1204 }
1205
1206 static struct platform_driver i8042_driver = {
1207         .driver         = {
1208                 .name   = "i8042",
1209                 .owner  = THIS_MODULE,
1210         },
1211         .probe          = i8042_probe,
1212         .remove         = __devexit_p(i8042_remove),
1213         .shutdown       = i8042_shutdown,
1214 #ifdef CONFIG_PM
1215         .suspend        = i8042_suspend,
1216         .resume         = i8042_resume,
1217 #endif
1218 };
1219
1220 static int __init i8042_init(void)
1221 {
1222         int err;
1223
1224         dbg_init();
1225
1226         err = i8042_platform_init();
1227         if (err)
1228                 return err;
1229
1230         err = i8042_controller_check();
1231         if (err)
1232                 goto err_platform_exit;
1233
1234         err = platform_driver_register(&i8042_driver);
1235         if (err)
1236                 goto err_platform_exit;
1237
1238         i8042_platform_device = platform_device_alloc("i8042", -1);
1239         if (!i8042_platform_device) {
1240                 err = -ENOMEM;
1241                 goto err_unregister_driver;
1242         }
1243
1244         err = platform_device_add(i8042_platform_device);
1245         if (err)
1246                 goto err_free_device;
1247
1248         panic_blink = i8042_panic_blink;
1249
1250         return 0;
1251
1252  err_free_device:
1253         platform_device_put(i8042_platform_device);
1254  err_unregister_driver:
1255         platform_driver_unregister(&i8042_driver);
1256  err_platform_exit:
1257         i8042_platform_exit();
1258
1259         return err;
1260 }
1261
1262 static void __exit i8042_exit(void)
1263 {
1264         platform_device_unregister(i8042_platform_device);
1265         platform_driver_unregister(&i8042_driver);
1266         i8042_platform_exit();
1267
1268         panic_blink = NULL;
1269 }
1270
1271 module_init(i8042_init);
1272 module_exit(i8042_exit);