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
  86 #define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
  87
  88 MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
  89 MODULE_DESCRIPTION(DRIVER_DESC);
  90 MODULE_LICENSE("GPL");
  91
  92 #undef VSXXXAA_DEBUG
  93 #ifdef VSXXXAA_DEBUG
  94 #define DBG(x...) printk(x)
  95 #else
  96 #define DBG(x...) do {} while (0)
  97 #endif
  98
  99 #define VSXXXAA_INTRO_MASK      0x80
 100 #define VSXXXAA_INTRO_HEAD      0x80
 101 #define IS_HDR_BYTE(x)                  \
 102         (((x) & VSXXXAA_INTRO_MASK) == VSXXXAA_INTRO_HEAD)
 103
 104 #define VSXXXAA_PACKET_MASK     0xe0
 105 #define VSXXXAA_PACKET_REL      0x80
 106 #define VSXXXAA_PACKET_ABS      0xc0
 107 #define VSXXXAA_PACKET_POR      0xa0
 108 #define MATCH_PACKET_TYPE(data, type)   \
 109         (((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 vsxxxaa_drop_bytes(struct vsxxxaa *mouse, int num)
 127 {
 128         if (num >= mouse->count) {
 129                 mouse->count = 0;
 130         } else {
 131                 memmove(mouse->buf, mouse->buf + num, BUFLEN - num);
 132                 mouse->count -= num;
 133         }
 134 }
 135
 136 static void vsxxxaa_queue_byte(struct vsxxxaa *mouse, unsigned char byte)
 137 {
 138         if (mouse->count == BUFLEN) {
 139                 printk(KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",
 140                         mouse->name, mouse->phys);
 141                 vsxxxaa_drop_bytes(mouse, 1);
 142         }
 143
 144         DBG(KERN_INFO "Queueing byte 0x%02x\n", byte);
 145
 146         mouse->buf[mouse->count++] = byte;
 147 }
 148
 149 static void vsxxxaa_detection_done(struct vsxxxaa *mouse)
 150 {
 151         switch (mouse->type) {
 152         case 0x02:
 153                 strlcpy(mouse->name, "DEC VSXXX-AA/-GA mouse",
 154                         sizeof(mouse->name));
 155                 break;
 156
 157         case 0x04:
 158                 strlcpy(mouse->name, "DEC VSXXX-AB digitizer",
 159                         sizeof(mouse->name));
 160                 break;
 161
 162         default:
 163                 snprintf(mouse->name, sizeof(mouse->name),
 164                          "unknown DEC pointer device (type = 0x%02x)",
 165                          mouse->type);
 166                 break;
 167         }
 168
 169         printk(KERN_INFO
 170                 "Found %s version 0x%02x from country 0x%02x on port %s\n",
 171                 mouse->name, mouse->version, mouse->country, mouse->phys);
 172 }
 173
 174 /*
 175  * Returns number of bytes to be dropped, 0 if packet is okay.
 176  */
 177 static int vsxxxaa_check_packet(struct vsxxxaa *mouse, int packet_len)
 178 {
 179         int i;
 180
 181         /* First byte must be a header byte */
 182         if (!IS_HDR_BYTE(mouse->buf[0])) {
 183                 DBG("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]);
 184                 return 1;
 185         }
 186
 187         /* Check all following bytes */
 188         for (i = 1; i < packet_len; i++) {
 189                 if (IS_HDR_BYTE(mouse->buf[i])) {
 190                         printk(KERN_ERR
 191                                 "Need to drop %d bytes of a broken packet.\n",
 192                                 i - 1);
 193                         DBG(KERN_INFO "check: len=%d, b[%d]=0x%02x\n",
 194                             packet_len, i, mouse->buf[i]);
 195                         return i - 1;
 196                 }
 197         }
 198
 199         return 0;
 200 }
 201
 202 static inline int vsxxxaa_smells_like_packet(struct vsxxxaa *mouse,
 203                                              unsigned char type, size_t len)
 204 {
 205         return mouse->count >= len && MATCH_PACKET_TYPE(mouse->buf[0], type);
 206 }
 207
 208 static void vsxxxaa_handle_REL_packet(struct vsxxxaa *mouse)
 209 {
 210         struct input_dev *dev = mouse->dev;
 211         unsigned char *buf = mouse->buf;
 212         int left, middle, right;
 213         int dx, dy;
 214
 215         /*
 216          * Check for normal stream packets. This is three bytes,
 217          * with the first byte's 3 MSB set to 100.
 218          *
 219          * [0]: 1       0       0       SignX   SignY   Left    Middle  Right
 220          * [1]: 0       dx      dx      dx      dx      dx      dx      dx
 221          * [2]: 0       dy      dy      dy      dy      dy      dy      dy
 222          */
 223
 224         /*
 225          * Low 7 bit of byte 1 are abs(dx), bit 7 is
 226          * 0, bit 4 of byte 0 is direction.
 227          */
 228         dx = buf[1] & 0x7f;
 229         dx *= ((buf[0] >> 4) & 0x01) ? 1 : -1;
 230
 231         /*
 232          * Low 7 bit of byte 2 are abs(dy), bit 7 is
 233          * 0, bit 3 of byte 0 is direction.
 234          */
 235         dy = buf[2] & 0x7f;
 236         dy *= ((buf[0] >> 3) & 0x01) ? -1 : 1;
 237
 238         /*
 239          * Get button state. It's the low three bits
 240          * (for three buttons) of byte 0.
 241          */
 242         left    = buf[0] & 0x04;
 243         middle  = buf[0] & 0x02;
 244         right   = buf[0] & 0x01;
 245
 246         vsxxxaa_drop_bytes(mouse, 3);
 247
 248         DBG(KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n",
 249             mouse->name, mouse->phys, dx, dy,
 250             left ? "L" : "l", middle ? "M" : "m", right ? "R" : "r");
 251
 252         /*
 253          * Report what we've found so far...
 254          */
 255         input_report_key(dev, BTN_LEFT, left);
 256         input_report_key(dev, BTN_MIDDLE, middle);
 257         input_report_key(dev, BTN_RIGHT, right);
 258         input_report_key(dev, BTN_TOUCH, 0);
 259         input_report_rel(dev, REL_X, dx);
 260         input_report_rel(dev, REL_Y, dy);
 261         input_sync(dev);
 262 }
 263
 264 static void vsxxxaa_handle_ABS_packet(struct vsxxxaa *mouse)
 265 {
 266         struct input_dev *dev = mouse->dev;
 267         unsigned char *buf = mouse->buf;
 268         int left, middle, right, touch;
 269         int x, y;
 270
 271         /*
 272          * Tablet position / button packet
 273          *
 274          * [0]: 1       1       0       B4      B3      B2      B1      Pr
 275          * [1]: 0       0       X5      X4      X3      X2      X1      X0
 276          * [2]: 0       0       X11     X10     X9      X8      X7      X6
 277          * [3]: 0       0       Y5      Y4      Y3      Y2      Y1      Y0
 278          * [4]: 0       0       Y11     Y10     Y9      Y8      Y7      Y6
 279          */
 280
 281         /*
 282          * Get X/Y position. Y axis needs to be inverted since VSXXX-AB
 283          * counts down->top while monitor counts top->bottom.
 284          */
 285         x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f);
 286         y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f);
 287         y = 1023 - y;
 288
 289         /*
 290          * Get button state. It's bits <4..1> of byte 0.
 291          */
 292         left    = buf[0] & 0x02;
 293         middle  = buf[0] & 0x04;
 294         right   = buf[0] & 0x08;
 295         touch   = buf[0] & 0x10;
 296
 297         vsxxxaa_drop_bytes(mouse, 5);
 298
 299         DBG(KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n",
 300             mouse->name, mouse->phys, x, y,
 301             left ? "L" : "l", middle ? "M" : "m",
 302             right ? "R" : "r", touch ? "T" : "t");
 303
 304         /*
 305          * Report what we've found so far...
 306          */
 307         input_report_key(dev, BTN_LEFT, left);
 308         input_report_key(dev, BTN_MIDDLE, middle);
 309         input_report_key(dev, BTN_RIGHT, right);
 310         input_report_key(dev, BTN_TOUCH, touch);
 311         input_report_abs(dev, ABS_X, x);
 312         input_report_abs(dev, ABS_Y, y);
 313         input_sync(dev);
 314 }
 315
 316 static void vsxxxaa_handle_POR_packet(struct vsxxxaa *mouse)
 317 {
 318         struct input_dev *dev = mouse->dev;
 319         unsigned char *buf = mouse->buf;
 320         int left, middle, right;
 321         unsigned char error;
 322
 323         /*
 324          * Check for Power-On-Reset packets. These are sent out
 325          * after plugging the mouse in, or when explicitly
 326          * requested by sending 'T'.
 327          *
 328          * [0]: 1       0       1       0       R3      R2      R1      R0
 329          * [1]: 0       M2      M1      M0      D3      D2      D1      D0
 330          * [2]: 0       E6      E5      E4      E3      E2      E1      E0
 331          * [3]: 0       0       0       0       0       Left    Middle  Right
 332          *
 333          * M: manufacturer location code
 334          * R: revision code
 335          * E: Error code. If it's in the range of 0x00..0x1f, only some
 336          *    minor problem occurred. Errors >= 0x20 are considered bad
 337          *    and the device may not work properly...
 338          * D: <0010> == mouse, <0100> == tablet
 339          */
 340
 341         mouse->version = buf[0] & 0x0f;
 342         mouse->country = (buf[1] >> 4) & 0x07;
 343         mouse->type = buf[1] & 0x0f;
 344         error = buf[2] & 0x7f;
 345
 346         /*
 347          * Get button state. It's the low three bits
 348          * (for three buttons) of byte 0. Maybe even the bit <3>
 349          * has some meaning if a tablet is attached.
 350          */
 351         left    = buf[0] & 0x04;
 352         middle  = buf[0] & 0x02;
 353         right   = buf[0] & 0x01;
 354
 355         vsxxxaa_drop_bytes(mouse, 4);
 356         vsxxxaa_detection_done(mouse);
 357
 358         if (error <= 0x1f) {
 359                 /* No (serious) error. Report buttons */
 360                 input_report_key(dev, BTN_LEFT, left);
 361                 input_report_key(dev, BTN_MIDDLE, middle);
 362                 input_report_key(dev, BTN_RIGHT, right);
 363                 input_report_key(dev, BTN_TOUCH, 0);
 364                 input_sync(dev);
 365
 366                 if (error != 0)
 367                         printk(KERN_INFO "Your %s on %s reports error=0x%02x\n",
 368                                 mouse->name, mouse->phys, error);
 369
 370         }
 371
 372         /*
 373          * If the mouse was hot-plugged, we need to force differential mode
 374          * now... However, give it a second to recover from it's reset.
 375          */
 376         printk(KERN_NOTICE
 377                 "%s on %s: Forcing standard packet format, "
 378                 "incremental streaming mode and 72 samples/sec\n",
 379                 mouse->name, mouse->phys);
 380         serio_write(mouse->serio, 'S'); /* Standard format */
 381         mdelay(50);
 382         serio_write(mouse->serio, 'R'); /* Incremental */
 383         mdelay(50);
 384         serio_write(mouse->serio, 'L'); /* 72 samples/sec */
 385 }
 386
 387 static void vsxxxaa_parse_buffer(struct vsxxxaa *mouse)
 388 {
 389         unsigned char *buf = mouse->buf;
 390         int stray_bytes;
 391
 392         /*
 393          * Parse buffer to death...
 394          */
 395         do {
 396                 /*
 397                  * Out of sync? Throw away what we don't understand. Each
 398                  * packet starts with a byte whose bit 7 is set. Unhandled
 399                  * packets (ie. which we don't know about or simply b0rk3d
 400                  * data...) will get shifted out of the buffer after some
 401                  * activity on the mouse.
 402                  */
 403                 while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {
 404                         printk(KERN_ERR "%s on %s: Dropping a byte to regain "
 405                                 "sync with mouse data stream...\n",
 406                                 mouse->name, mouse->phys);
 407                         vsxxxaa_drop_bytes(mouse, 1);
 408                 }
 409
 410                 /*
 411                  * Check for packets we know about.
 412                  */
 413
 414                 if (vsxxxaa_smells_like_packet(mouse, VSXXXAA_PACKET_REL, 3)) {
 415                         /* Check for broken packet */
 416                         stray_bytes = vsxxxaa_check_packet(mouse, 3);
 417                         if (!stray_bytes)
 418                                 vsxxxaa_handle_REL_packet(mouse);
 419
 420                 } else if (vsxxxaa_smells_like_packet(mouse,
 421                                                       VSXXXAA_PACKET_ABS, 5)) {
 422                         /* Check for broken packet */
 423                         stray_bytes = vsxxxaa_check_packet(mouse, 5);
 424                         if (!stray_bytes)
 425                                 vsxxxaa_handle_ABS_packet(mouse);
 426
 427                 } else if (vsxxxaa_smells_like_packet(mouse,
 428                                                       VSXXXAA_PACKET_POR, 4)) {
 429                         /* Check for broken packet */
 430                         stray_bytes = vsxxxaa_check_packet(mouse, 4);
 431                         if (!stray_bytes)
 432                                 vsxxxaa_handle_POR_packet(mouse);
 433
 434                 } else {
 435                         break; /* No REL, ABS or POR packet found */
 436                 }
 437
 438                 if (stray_bytes > 0) {
 439                         printk(KERN_ERR "Dropping %d bytes now...\n",
 440                                 stray_bytes);
 441                         vsxxxaa_drop_bytes(mouse, stray_bytes);
 442                 }
 443
 444         } while (1);
 445 }
 446
 447 static irqreturn_t vsxxxaa_interrupt(struct serio *serio,
 448                                      unsigned char data, unsigned int flags)
 449 {
 450         struct vsxxxaa *mouse = serio_get_drvdata(serio);
 451
 452         vsxxxaa_queue_byte(mouse, data);
 453         vsxxxaa_parse_buffer(mouse);
 454
 455         return IRQ_HANDLED;
 456 }
 457
 458 static void vsxxxaa_disconnect(struct serio *serio)
 459 {
 460         struct vsxxxaa *mouse = serio_get_drvdata(serio);
 461
 462         serio_close(serio);
 463         serio_set_drvdata(serio, NULL);
 464         input_unregister_device(mouse->dev);
 465         kfree(mouse);
 466 }
 467
 468 static int vsxxxaa_connect(struct serio *serio, struct serio_driver *drv)
 469 {
 470         struct vsxxxaa *mouse;
 471         struct input_dev *input_dev;
 472         int err = -ENOMEM;
 473
 474         mouse = kzalloc(sizeof(struct vsxxxaa), GFP_KERNEL);
 475         input_dev = input_allocate_device();
 476         if (!mouse || !input_dev)
 477                 goto fail1;
 478
 479         mouse->dev = input_dev;
 480         mouse->serio = serio;
 481         strlcat(mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer",
 482                  sizeof(mouse->name));
 483         snprintf(mouse->phys, sizeof(mouse->phys), "%s/input0", serio->phys);
 484
 485         input_dev->name = mouse->name;
 486         input_dev->phys = mouse->phys;
 487         input_dev->id.bustype = BUS_RS232;
 488         input_dev->dev.parent = &serio->dev;
 489
 490         __set_bit(EV_KEY, input_dev->evbit);            /* We have buttons */
 491         __set_bit(EV_REL, input_dev->evbit);
 492         __set_bit(EV_ABS, input_dev->evbit);
 493         __set_bit(BTN_LEFT, input_dev->keybit);         /* We have 3 buttons */
 494         __set_bit(BTN_MIDDLE, input_dev->keybit);
 495         __set_bit(BTN_RIGHT, input_dev->keybit);
 496         __set_bit(BTN_TOUCH, input_dev->keybit);        /* ...and Tablet */
 497         __set_bit(REL_X, input_dev->relbit);
 498         __set_bit(REL_Y, input_dev->relbit);
 499         input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
 500         input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
 501
 502         serio_set_drvdata(serio, mouse);
 503
 504         err = serio_open(serio, drv);
 505         if (err)
 506                 goto fail2;
 507
 508         /*
 509          * Request selftest. Standard packet format and differential
 510          * mode will be requested after the device ID'ed successfully.
 511          */
 512         serio_write(serio, 'T'); /* Test */
 513
 514         err = input_register_device(input_dev);
 515         if (err)
 516                 goto fail3;
 517
 518         return 0;
 519
 520  fail3: serio_close(serio);
 521  fail2: serio_set_drvdata(serio, NULL);
 522  fail1: input_free_device(input_dev);
 523         kfree(mouse);
 524         return err;
 525 }
 526
 527 static struct serio_device_id vsxxaa_serio_ids[] = {
 528         {
 529                 .type   = SERIO_RS232,
 530                 .proto  = SERIO_VSXXXAA,
 531                 .id     = SERIO_ANY,
 532                 .extra  = SERIO_ANY,
 533         },
 534         { 0 }
 535 };
 536
 537 MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids);
 538
 539 static struct serio_driver vsxxxaa_drv = {
 540         .driver         = {
 541                 .name   = "vsxxxaa",
 542         },
 543         .description    = DRIVER_DESC,
 544         .id_table       = vsxxaa_serio_ids,
 545         .connect        = vsxxxaa_connect,
 546         .interrupt      = vsxxxaa_interrupt,
 547         .disconnect     = vsxxxaa_disconnect,
 548 };
 549
 550 module_serio_driver(vsxxxaa_drv);