drivers/input/mouse/vsxxxaa.c

   1 /*
   2  * Driver for   DEC VSXXX-AA mouse (hockey-puck mouse, ball or two rollers)
   3  *              DEC VSXXX-GA mouse (rectangular mouse, with ball)
   4  *              DEC VSXXX-AB tablet (digitizer with hair cross or stylus)
   5  *
   6  * Copyright (C) 2003-2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
   7  *
   8  * The packet format was initially taken from a patch to GPM which is (C) 2001
   9  * by   Karsten Merker <merker@linuxtag.org>
  10  * and  Maciej W. Rozycki <macro@ds2.pg.gda.pl>
  11  * Later on, I had access to the device's documentation (referenced below).
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  */
  29
  30 /*
  31  * Building an adaptor to DE9 / DB25 RS232
  32  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  33  *
  34  * DISCLAIMER: Use this description AT YOUR OWN RISK! I'll not pay for
  35  * anything if you break your mouse, your computer or whatever!
  36  *
  37  * In theory, this mouse is a simple RS232 device. In practice, it has got
  38  * a quite uncommon plug and the requirement to additionally get a power
  39  * supply at +5V and -12V.
  40  *
  41  * If you look at the socket/jack (_not_ at the plug), we use this pin
  42  * numbering:
  43  *    _______
  44  *   / 7 6 5 \
  45  *  | 4 --- 3 |
  46  *   \  2 1  /
  47  *    -------
  48  *
  49  *      DEC socket      DE9     DB25    Note
  50  *      1 (GND)         5       7       -
  51  *      2 (RxD)         2       3       -
  52  *      3 (TxD)         3       2       -
  53  *      4 (-12V)        -       -       Somewhere from the PSU. At ATX, it's
  54  *                                      the thin blue wire at pin 12 of the
  55  *                                      ATX power connector. Only required for
  56  *                                      VSXXX-AA/-GA mice.
  57  *      5 (+5V)         -       -       PSU (red wires of ATX power connector
  58  *                                      on pin 4, 6, 19 or 20) or HDD power
  59  *                                      connector (also red wire).
  60  *      6 (+12V)        -       -       HDD power connector, yellow wire. Only
  61  *                                      required for VSXXX-AB digitizer.
  62  *      7 (dev. avail.) -       -       The mouse shorts this one to pin 1.
  63  *                                      This way, the host computer can detect
  64  *                                      the mouse. To use it with the adaptor,
  65  *                                      simply don't connect this pin.
  66  *
  67  * So to get a working adaptor, you need to connect the mouse with three
  68  * wires to a RS232 port and two or three additional wires for +5V, +12V and
  69  * -12V to the PSU.
  70  *
  71  * Flow specification for the link is 4800, 8o1.
  72  *
  73  * The mice and tablet are described in "VCB02 Video Subsystem - Technical
  74  * Manual", DEC EK-104AA-TM-001. You'll find it at MANX, a search engine
  75  * specific for DEC documentation. Try
  76  * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
  77  */
  78
  79 #include <linux/delay.h>
  80 #include <linux/module.h>
  81 #include <linux/slab.h>
  82 #include <linux/interrupt.h>
  83 #include <linux/input.h>
  84 #include <linux/serio.h>
  85 #include <linux/init.h>
  86
  87 #define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
  88
  89 MODULE_AUTHOR ("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
  90 MODULE_DESCRIPTION (DRIVER_DESC);
  91 MODULE_LICENSE ("GPL");
  92
  93 #undef VSXXXAA_DEBUG
  94 #ifdef VSXXXAA_DEBUG
  95 #define DBG(x...) printk (x)
  96 #else
  97 #define DBG(x...) do {} while (0)
  98 #endif
  99
 100 #define VSXXXAA_INTRO_MASK      0x80
 101 #define VSXXXAA_INTRO_HEAD      0x80
 102 #define IS_HDR_BYTE(x)          (((x) & VSXXXAA_INTRO_MASK)     \
 103                                         == VSXXXAA_INTRO_HEAD)
 104
 105 #define VSXXXAA_PACKET_MASK     0xe0
 106 #define VSXXXAA_PACKET_REL      0x80
 107 #define VSXXXAA_PACKET_ABS      0xc0
 108 #define VSXXXAA_PACKET_POR      0xa0
 109 #define MATCH_PACKET_TYPE(data, type)   (((data) & VSXXXAA_PACKET_MASK) == (type))
 110
 111
 112
 113 struct vsxxxaa {
 114         struct input_dev *dev;
 115         struct serio *serio;
 116 #define BUFLEN 15 /* At least 5 is needed for a full tablet packet */
 117         unsigned char buf[BUFLEN];
 118         unsigned char count;
 119         unsigned char version;
 120         unsigned char country;
 121         unsigned char type;
 122         char name[64];
 123         char phys[32];
 124 };
 125
 126 static void
 127 vsxxxaa_drop_bytes (struct vsxxxaa *mouse, int num)
 128 {
 129         if (num >= mouse->count)
 130                 mouse->count = 0;
 131         else {
 132                 memmove (mouse->buf, mouse->buf + num - 1, BUFLEN - num);
 133                 mouse->count -= num;
 134         }
 135 }
 136
 137 static void
 138 vsxxxaa_queue_byte (struct vsxxxaa *mouse, unsigned char byte)
 139 {
 140         if (mouse->count == BUFLEN) {
 141                 printk (KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",
 142                                 mouse->name, mouse->phys);
 143                 vsxxxaa_drop_bytes (mouse, 1);
 144         }
 145         DBG (KERN_INFO "Queueing byte 0x%02x\n", byte);
 146
 147         mouse->buf[mouse->count++] = byte;
 148 }
 149
 150 static void
 151 vsxxxaa_detection_done (struct vsxxxaa *mouse)
 152 {
 153         switch (mouse->type) {
 154                 case 0x02:
 155                         strlcpy (mouse->name, "DEC VSXXX-AA/-GA mouse",
 156                                  sizeof (mouse->name));
 157                         break;
 158
 159                 case 0x04:
 160                         strlcpy (mouse->name, "DEC VSXXX-AB digitizer",
 161                                  sizeof (mouse->name));
 162                         break;
 163
 164                 default:
 165                         snprintf (mouse->name, sizeof (mouse->name),
 166                                   "unknown DEC pointer device (type = 0x%02x)",
 167                                   mouse->type);
 168                         break;
 169         }
 170
 171         printk (KERN_INFO
 172                 "Found %s version 0x%02x from country 0x%02x on port %s\n",
 173                 mouse->name, mouse->version, mouse->country, mouse->phys);
 174 }
 175
 176 /*
 177  * Returns number of bytes to be dropped, 0 if packet is okay.
 178  */
 179 static int
 180 vsxxxaa_check_packet (struct vsxxxaa *mouse, int packet_len)
 181 {
 182         int i;
 183
 184         /* First byte must be a header byte */
 185         if (!IS_HDR_BYTE (mouse->buf[0])) {
 186                 DBG ("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]);
 187                 return 1;
 188         }
 189
 190         /* Check all following bytes */
 191         if (packet_len > 1) {
 192                 for (i = 1; i < packet_len; i++) {
 193                         if (IS_HDR_BYTE (mouse->buf[i])) {
 194                                 printk (KERN_ERR "Need to drop %d bytes "
 195                                                 "of a broken packet.\n",
 196                                                 i - 1);
 197                                 DBG (KERN_INFO "check: len=%d, b[%d]=0x%02x\n",
 198                                                 packet_len, i, mouse->buf[i]);
 199                                 return i - 1;
 200                         }
 201                 }
 202         }
 203
 204         return 0;
 205 }
 206
 207 static __inline__ int
 208 vsxxxaa_smells_like_packet (struct vsxxxaa *mouse, unsigned char type, size_t len)
 209 {
 210         return (mouse->count >= len) && MATCH_PACKET_TYPE (mouse->buf[0], type);
 211 }
 212
 213 static void
 214 vsxxxaa_handle_REL_packet (struct vsxxxaa *mouse, struct pt_regs *regs)
 215 {
 216         struct input_dev *dev = mouse->dev;
 217         unsigned char *buf = mouse->buf;
 218         int left, middle, right;
 219         int dx, dy;
 220
 221         /*
 222          * Check for normal stream packets. This is three bytes,
 223          * with the first byte's 3 MSB set to 100.
 224          *
 225          * [0]: 1       0       0       SignX   SignY   Left    Middle  Right
 226          * [1]: 0       dx      dx      dx      dx      dx      dx      dx
 227          * [2]: 0       dy      dy      dy      dy      dy      dy      dy
 228          */
 229
 230         /*
 231          * Low 7 bit of byte 1 are abs(dx), bit 7 is
 232          * 0, bit 4 of byte 0 is direction.
 233          */
 234         dx = buf[1] & 0x7f;
 235         dx *= ((buf[0] >> 4) & 0x01)? 1: -1;
 236
 237         /*
 238          * Low 7 bit of byte 2 are abs(dy), bit 7 is
 239          * 0, bit 3 of byte 0 is direction.
 240          */
 241         dy = buf[2] & 0x7f;
 242         dy *= ((buf[0] >> 3) & 0x01)? -1: 1;
 243
 244         /*
 245          * Get button state. It's the low three bits
 246          * (for three buttons) of byte 0.
 247          */
 248         left    = (buf[0] & 0x04)? 1: 0;
 249         middle  = (buf[0] & 0x02)? 1: 0;
 250         right   = (buf[0] & 0x01)? 1: 0;
 251
 252         vsxxxaa_drop_bytes (mouse, 3);
 253
 254         DBG (KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n",
 255                         mouse->name, mouse->phys, dx, dy,
 256                         left? "L": "l", middle? "M": "m", right? "R": "r");
 257
 258         /*
 259          * Report what we've found so far...
 260          */
 261         input_regs (dev, regs);
 262         input_report_key (dev, BTN_LEFT, left);
 263         input_report_key (dev, BTN_MIDDLE, middle);
 264         input_report_key (dev, BTN_RIGHT, right);
 265         input_report_key (dev, BTN_TOUCH, 0);
 266         input_report_rel (dev, REL_X, dx);
 267         input_report_rel (dev, REL_Y, dy);
 268         input_sync (dev);
 269 }
 270
 271 static void
 272 vsxxxaa_handle_ABS_packet (struct vsxxxaa *mouse, struct pt_regs *regs)
 273 {
 274         struct input_dev *dev = mouse->dev;
 275         unsigned char *buf = mouse->buf;
 276         int left, middle, right, touch;
 277         int x, y;
 278
 279         /*
 280          * Tablet position / button packet
 281          *
 282          * [0]: 1       1       0       B4      B3      B2      B1      Pr
 283          * [1]: 0       0       X5      X4      X3      X2      X1      X0
 284          * [2]: 0       0       X11     X10     X9      X8      X7      X6
 285          * [3]: 0       0       Y5      Y4      Y3      Y2      Y1      Y0
 286          * [4]: 0       0       Y11     Y10     Y9      Y8      Y7      Y6
 287          */
 288
 289         /*
 290          * Get X/Y position. Y axis needs to be inverted since VSXXX-AB
 291          * counts down->top while monitor counts top->bottom.
 292          */
 293         x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f);
 294         y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f);
 295         y = 1023 - y;
 296
 297         /*
 298          * Get button state. It's bits <4..1> of byte 0.
 299          */
 300         left    = (buf[0] & 0x02)? 1: 0;
 301         middle  = (buf[0] & 0x04)? 1: 0;
 302         right   = (buf[0] & 0x08)? 1: 0;
 303         touch   = (buf[0] & 0x10)? 1: 0;
 304
 305         vsxxxaa_drop_bytes (mouse, 5);
 306
 307         DBG (KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n",
 308                         mouse->name, mouse->phys, x, y,
 309                         left? "L": "l", middle? "M": "m",
 310                         right? "R": "r", touch? "T": "t");
 311
 312         /*
 313          * Report what we've found so far...
 314          */
 315         input_regs (dev, regs);
 316         input_report_key (dev, BTN_LEFT, left);
 317         input_report_key (dev, BTN_MIDDLE, middle);
 318         input_report_key (dev, BTN_RIGHT, right);
 319         input_report_key (dev, BTN_TOUCH, touch);
 320         input_report_abs (dev, ABS_X, x);
 321         input_report_abs (dev, ABS_Y, y);
 322         input_sync (dev);
 323 }
 324
 325 static void
 326 vsxxxaa_handle_POR_packet (struct vsxxxaa *mouse, struct pt_regs *regs)
 327 {
 328         struct input_dev *dev = mouse->dev;
 329         unsigned char *buf = mouse->buf;
 330         int left, middle, right;
 331         unsigned char error;
 332
 333         /*
 334          * Check for Power-On-Reset packets. These are sent out
 335          * after plugging the mouse in, or when explicitely
 336          * requested by sending 'T'.
 337          *
 338          * [0]: 1       0       1       0       R3      R2      R1      R0
 339          * [1]: 0       M2      M1      M0      D3      D2      D1      D0
 340          * [2]: 0       E6      E5      E4      E3      E2      E1      E0
 341          * [3]: 0       0       0       0       0       Left    Middle  Right
 342          *
 343          * M: manufacturer location code
 344          * R: revision code
 345          * E: Error code. If it's in the range of 0x00..0x1f, only some
 346          *    minor problem occured. Errors >= 0x20 are considered bad
 347          *    and the device may not work properly...
 348          * D: <0010> == mouse, <0100> == tablet
 349          */
 350
 351         mouse->version = buf[0] & 0x0f;
 352         mouse->country = (buf[1] >> 4) & 0x07;
 353         mouse->type = buf[1] & 0x0f;
 354         error = buf[2] & 0x7f;
 355
 356         /*
 357          * Get button state. It's the low three bits
 358          * (for three buttons) of byte 0. Maybe even the bit <3>
 359          * has some meaning if a tablet is attached.
 360          */
 361         left    = (buf[0] & 0x04)? 1: 0;
 362         middle  = (buf[0] & 0x02)? 1: 0;
 363         right   = (buf[0] & 0x01)? 1: 0;
 364
 365         vsxxxaa_drop_bytes (mouse, 4);
 366         vsxxxaa_detection_done (mouse);
 367
 368         if (error <= 0x1f) {
 369                 /* No (serious) error. Report buttons */
 370                 input_regs (dev, regs);
 371                 input_report_key (dev, BTN_LEFT, left);
 372                 input_report_key (dev, BTN_MIDDLE, middle);
 373                 input_report_key (dev, BTN_RIGHT, right);
 374                 input_report_key (dev, BTN_TOUCH, 0);
 375                 input_sync (dev);
 376
 377                 if (error != 0)
 378                         printk (KERN_INFO "Your %s on %s reports error=0x%02x\n",
 379                                         mouse->name, mouse->phys, error);
 380
 381         }
 382
 383         /*
 384          * If the mouse was hot-plugged, we need to force differential mode
 385          * now... However, give it a second to recover from it's reset.
 386          */
 387         printk (KERN_NOTICE "%s on %s: Forceing standard packet format, "
 388                         "incremental streaming mode and 72 samples/sec\n",
 389                         mouse->name, mouse->phys);
 390         mouse->serio->write (mouse->serio, 'S');        /* Standard format */
 391         mdelay (50);
 392         mouse->serio->write (mouse->serio, 'R');        /* Incremental */
 393         mdelay (50);
 394         mouse->serio->write (mouse->serio, 'L');        /* 72 samples/sec */
 395 }
 396
 397 static void
 398 vsxxxaa_parse_buffer (struct vsxxxaa *mouse, struct pt_regs *regs)
 399 {
 400         unsigned char *buf = mouse->buf;
 401         int stray_bytes;
 402
 403         /*
 404          * Parse buffer to death...
 405          */
 406         do {
 407                 /*
 408                  * Out of sync? Throw away what we don't understand. Each
 409                  * packet starts with a byte whose bit 7 is set. Unhandled
 410                  * packets (ie. which we don't know about or simply b0rk3d
 411                  * data...) will get shifted out of the buffer after some
 412                  * activity on the mouse.
 413                  */
 414                 while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {
 415                         printk (KERN_ERR "%s on %s: Dropping a byte to regain "
 416                                         "sync with mouse data stream...\n",
 417                                         mouse->name, mouse->phys);
 418                         vsxxxaa_drop_bytes (mouse, 1);
 419                 }
 420
 421                 /*
 422                  * Check for packets we know about.
 423                  */
 424
 425                 if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_REL, 3)) {
 426                         /* Check for broken packet */
 427                         stray_bytes = vsxxxaa_check_packet (mouse, 3);
 428                         if (stray_bytes > 0) {
 429                                 printk (KERN_ERR "Dropping %d bytes now...\n",
 430                                                 stray_bytes);
 431                                 vsxxxaa_drop_bytes (mouse, stray_bytes);
 432                                 continue;
 433                         }
 434
 435                         vsxxxaa_handle_REL_packet (mouse, regs);
 436                         continue; /* More to parse? */
 437                 }
 438
 439                 if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_ABS, 5)) {
 440                         /* Check for broken packet */
 441                         stray_bytes = vsxxxaa_check_packet (mouse, 5);
 442                         if (stray_bytes > 0) {
 443                                 printk (KERN_ERR "Dropping %d bytes now...\n",
 444                                                 stray_bytes);
 445                                 vsxxxaa_drop_bytes (mouse, stray_bytes);
 446                                 continue;
 447                         }
 448
 449                         vsxxxaa_handle_ABS_packet (mouse, regs);
 450                         continue; /* More to parse? */
 451                 }
 452
 453                 if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_POR, 4)) {
 454                         /* Check for broken packet */
 455                         stray_bytes = vsxxxaa_check_packet (mouse, 4);
 456                         if (stray_bytes > 0) {
 457                                 printk (KERN_ERR "Dropping %d bytes now...\n",
 458                                                 stray_bytes);
 459                                 vsxxxaa_drop_bytes (mouse, stray_bytes);
 460                                 continue;
 461                         }
 462
 463                         vsxxxaa_handle_POR_packet (mouse, regs);
 464                         continue; /* More to parse? */
 465                 }
 466
 467                 break; /* No REL, ABS or POR packet found */
 468         } while (1);
 469 }
 470
 471 static irqreturn_t
 472 vsxxxaa_interrupt (struct serio *serio, unsigned char data, unsigned int flags,
 473                 struct pt_regs *regs)
 474 {
 475         struct vsxxxaa *mouse = serio_get_drvdata (serio);
 476
 477         vsxxxaa_queue_byte (mouse, data);
 478         vsxxxaa_parse_buffer (mouse, regs);
 479
 480         return IRQ_HANDLED;
 481 }
 482
 483 static void
 484 vsxxxaa_disconnect (struct serio *serio)
 485 {
 486         struct vsxxxaa *mouse = serio_get_drvdata (serio);
 487
 488         serio_close (serio);
 489         serio_set_drvdata (serio, NULL);
 490         input_unregister_device (mouse->dev);
 491         kfree (mouse);
 492 }
 493
 494 static int
 495 vsxxxaa_connect (struct serio *serio, struct serio_driver *drv)
 496 {
 497         struct vsxxxaa *mouse;
 498         struct input_dev *input_dev;
 499         int err = -ENOMEM;
 500
 501         mouse = kzalloc (sizeof (struct vsxxxaa), GFP_KERNEL);
 502         input_dev = input_allocate_device ();
 503         if (!mouse || !input_dev)
 504                 goto fail;
 505
 506         mouse->dev = input_dev;
 507         mouse->serio = serio;
 508         strlcat (mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer",
 509                  sizeof (mouse->name));
 510         snprintf (mouse->phys, sizeof (mouse->phys), "%s/input0", serio->phys);
 511
 512         input_dev->name = mouse->name;
 513         input_dev->phys = mouse->phys;
 514         input_dev->id.bustype = BUS_RS232;
 515         input_dev->cdev.dev = &serio->dev;
 516         input_dev->private = mouse;
 517
 518         set_bit (EV_KEY, input_dev->evbit);             /* We have buttons */
 519         set_bit (EV_REL, input_dev->evbit);
 520         set_bit (EV_ABS, input_dev->evbit);
 521         set_bit (BTN_LEFT, input_dev->keybit);          /* We have 3 buttons */
 522         set_bit (BTN_MIDDLE, input_dev->keybit);
 523         set_bit (BTN_RIGHT, input_dev->keybit);
 524         set_bit (BTN_TOUCH, input_dev->keybit);         /* ...and Tablet */
 525         set_bit (REL_X, input_dev->relbit);
 526         set_bit (REL_Y, input_dev->relbit);
 527         input_set_abs_params (input_dev, ABS_X, 0, 1023, 0, 0);
 528         input_set_abs_params (input_dev, ABS_Y, 0, 1023, 0, 0);
 529
 530         serio_set_drvdata (serio, mouse);
 531
 532         err = serio_open (serio, drv);
 533         if (err)
 534                 goto fail;
 535
 536         /*
 537          * Request selftest. Standard packet format and differential
 538          * mode will be requested after the device ID'ed successfully.
 539          */
 540         serio->write (serio, 'T'); /* Test */
 541
 542         input_register_device (input_dev);
 543
 544         return 0;
 545
 546  fail:  serio_set_drvdata (serio, NULL);
 547         input_free_device (input_dev);
 548         kfree (mouse);
 549         return err;
 550 }
 551
 552 static struct serio_device_id vsxxaa_serio_ids[] = {
 553         {
 554                 .type   = SERIO_RS232,
 555                 .proto  = SERIO_VSXXXAA,
 556                 .id     = SERIO_ANY,
 557                 .extra  = SERIO_ANY,
 558         },
 559         { 0 }
 560 };
 561
 562 MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids);
 563
 564 static struct serio_driver vsxxxaa_drv = {
 565         .driver         = {
 566                 .name   = "vsxxxaa",
 567         },
 568         .description    = DRIVER_DESC,
 569         .id_table       = vsxxaa_serio_ids,
 570         .connect        = vsxxxaa_connect,
 571         .interrupt      = vsxxxaa_interrupt,
 572         .disconnect     = vsxxxaa_disconnect,
 573 };
 574
 575 static int __init
 576 vsxxxaa_init (void)
 577 {
 578         serio_register_driver(&vsxxxaa_drv);
 579         return 0;
 580 }
 581
 582 static void __exit
 583 vsxxxaa_exit (void)
 584 {
 585         serio_unregister_driver(&vsxxxaa_drv);
 586 }
 587
 588 module_init (vsxxxaa_init);
 589 module_exit (vsxxxaa_exit);
 590