drivers/input/mouse/hil_ptr.c

   1 /*
   2  * Generic linux-input device driver for axis-bearing devices
   3  *
   4  * Copyright (c) 2001 Brian S. Julin
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * Alternatively, this software may be distributed under the terms of the
  17  * GNU General Public License ("GPL").
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  *
  29  * References:
  30  * HP-HIL Technical Reference Manual.  Hewlett Packard Product No. 45918A
  31  *
  32  */
  33
  34 #include <linux/hil.h>
  35 #include <linux/input.h>
  36 #include <linux/serio.h>
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/pci_ids.h>
  42
  43 #define PREFIX "HIL PTR: "
  44 #define HIL_GENERIC_NAME "HIL pointer device"
  45
  46 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
  47 MODULE_DESCRIPTION(HIL_GENERIC_NAME " driver");
  48 MODULE_LICENSE("Dual BSD/GPL");
  49
  50
  51 #define TABLET_SIMULATES_MOUSE  /* allow tablet to be used as mouse */
  52 #undef  TABLET_AUTOADJUST       /* auto-adjust valid tablet ranges */
  53
  54
  55 #define HIL_PTR_MAX_LENGTH 16
  56
  57 struct hil_ptr {
  58         struct input_dev dev;
  59         struct serio *serio;
  60
  61         /* Input buffer and index for packets from HIL bus. */
  62         hil_packet data[HIL_PTR_MAX_LENGTH];
  63         int idx4; /* four counts per packet */
  64
  65         /* Raw device info records from HIL bus, see hil.h for fields. */
  66         char    idd[HIL_PTR_MAX_LENGTH];        /* DID byte and IDD record */
  67         char    rsc[HIL_PTR_MAX_LENGTH];        /* RSC record */
  68         char    exd[HIL_PTR_MAX_LENGTH];        /* EXD record */
  69         char    rnm[HIL_PTR_MAX_LENGTH + 1];    /* RNM record + NULL term. */
  70
  71         /* Extra device details not contained in struct input_dev. */
  72         unsigned int nbtn, naxes;
  73         unsigned int btnmap[7];
  74
  75         /* Something to sleep around with. */
  76         struct semaphore sem;
  77 };
  78
  79 /* Process a complete packet after transfer from the HIL */
  80 static void hil_ptr_process_record(struct hil_ptr *ptr)
  81 {
  82         struct input_dev *dev = &ptr->dev;
  83         hil_packet *data = ptr->data;
  84         hil_packet p;
  85         int idx, i, cnt, laxis;
  86         int ax16, absdev;
  87
  88         idx = ptr->idx4/4;
  89         p = data[idx - 1];
  90
  91         if ((p & ~HIL_CMDCT_POL) ==
  92             (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL)) goto report;
  93         if ((p & ~HIL_CMDCT_RPL) ==
  94             (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL)) goto report;
  95
  96         /* Not a poll response.  See if we are loading config records. */
  97         switch (p & HIL_PKT_DATA_MASK) {
  98         case HIL_CMD_IDD:
  99                 for (i = 0; i < idx; i++)
 100                         ptr->idd[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
 101                 for (; i < HIL_PTR_MAX_LENGTH; i++)
 102                         ptr->idd[i] = 0;
 103                 break;
 104         case HIL_CMD_RSC:
 105                 for (i = 0; i < idx; i++)
 106                         ptr->rsc[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
 107                 for (; i < HIL_PTR_MAX_LENGTH; i++)
 108                         ptr->rsc[i] = 0;
 109                 break;
 110         case HIL_CMD_EXD:
 111                 for (i = 0; i < idx; i++)
 112                         ptr->exd[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
 113                 for (; i < HIL_PTR_MAX_LENGTH; i++)
 114                         ptr->exd[i] = 0;
 115                 break;
 116         case HIL_CMD_RNM:
 117                 for (i = 0; i < idx; i++)
 118                         ptr->rnm[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
 119                 for (; i < HIL_PTR_MAX_LENGTH + 1; i++)
 120                         ptr->rnm[i] = '\0';
 121                 break;
 122         default:
 123                 /* These occur when device isn't present */
 124                 if (p == (HIL_ERR_INT | HIL_PKT_CMD)) break;
 125                 /* Anything else we'd like to know about. */
 126                 printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
 127                 break;
 128         }
 129         goto out;
 130
 131  report:
 132         if ((p & HIL_CMDCT_POL) != idx - 1) {
 133                 printk(KERN_WARNING PREFIX "Malformed poll packet %x (idx = %i)\n", p, idx);
 134                 goto out;
 135         }
 136
 137         i = (ptr->data[0] & HIL_POL_AXIS_ALT) ? 3 : 0;
 138         laxis = ptr->data[0] & HIL_POL_NUM_AXES_MASK;
 139         laxis += i;
 140
 141         ax16 = ptr->idd[1] & HIL_IDD_HEADER_16BIT; /* 8 or 16bit resolution */
 142         absdev = ptr->idd[1] & HIL_IDD_HEADER_ABS;
 143
 144         for (cnt = 1; i < laxis; i++) {
 145                 unsigned int lo,hi,val;
 146                 lo = ptr->data[cnt++] & HIL_PKT_DATA_MASK;
 147                 hi = ax16 ? (ptr->data[cnt++] & HIL_PKT_DATA_MASK) : 0;
 148                 if (absdev) {
 149                         val = lo + (hi<<8);
 150 #ifdef TABLET_AUTOADJUST
 151                         if (val < ptr->dev.absmin[ABS_X + i])
 152                                 ptr->dev.absmin[ABS_X + i] = val;
 153                         if (val > ptr->dev.absmax[ABS_X + i])
 154                                 ptr->dev.absmax[ABS_X + i] = val;
 155 #endif
 156                         if (i%3) val = ptr->dev.absmax[ABS_X + i] - val;
 157                         input_report_abs(dev, ABS_X + i, val);
 158                 } else {
 159                         val = (int) (((int8_t)lo) | ((int8_t)hi<<8));
 160                         if (i%3) val *= -1;
 161                         input_report_rel(dev, REL_X + i, val);
 162                 }
 163         }
 164
 165         while (cnt < idx - 1) {
 166                 unsigned int btn;
 167                 int up;
 168                 btn = ptr->data[cnt++];
 169                 up = btn & 1;
 170                 btn &= 0xfe;
 171                 if (btn == 0x8e) {
 172                         continue; /* TODO: proximity == touch? */
 173                 }
 174                 else if ((btn > 0x8c) || (btn < 0x80)) continue;
 175                 btn = (btn - 0x80) >> 1;
 176                 btn = ptr->btnmap[btn];
 177                 input_report_key(dev, btn, !up);
 178         }
 179         input_sync(dev);
 180  out:
 181         ptr->idx4 = 0;
 182         up(&ptr->sem);
 183 }
 184
 185 static void hil_ptr_process_err(struct hil_ptr *ptr) {
 186         printk(KERN_WARNING PREFIX "errored HIL packet\n");
 187         ptr->idx4 = 0;
 188         up(&ptr->sem);
 189         return;
 190 }
 191
 192 static irqreturn_t hil_ptr_interrupt(struct serio *serio,
 193         unsigned char data, unsigned int flags, struct pt_regs *regs)
 194 {
 195         struct hil_ptr *ptr;
 196         hil_packet packet;
 197         int idx;
 198
 199         ptr = (struct hil_ptr *)serio->private;
 200         if (ptr == NULL) {
 201                 BUG();
 202                 return IRQ_HANDLED;
 203         }
 204
 205         if (ptr->idx4 >= (HIL_PTR_MAX_LENGTH * sizeof(hil_packet))) {
 206                 hil_ptr_process_err(ptr);
 207                 return IRQ_HANDLED;
 208         }
 209         idx = ptr->idx4/4;
 210         if (!(ptr->idx4 % 4)) ptr->data[idx] = 0;
 211         packet = ptr->data[idx];
 212         packet |= ((hil_packet)data) << ((3 - (ptr->idx4 % 4)) * 8);
 213         ptr->data[idx] = packet;
 214
 215         /* Records of N 4-byte hil_packets must terminate with a command. */
 216         if ((++(ptr->idx4)) % 4) return IRQ_HANDLED;
 217         if ((packet & 0xffff0000) != HIL_ERR_INT) {
 218                 hil_ptr_process_err(ptr);
 219                 return IRQ_HANDLED;
 220         }
 221         if (packet & HIL_PKT_CMD)
 222                 hil_ptr_process_record(ptr);
 223         return IRQ_HANDLED;
 224 }
 225
 226 static void hil_ptr_disconnect(struct serio *serio)
 227 {
 228         struct hil_ptr *ptr;
 229
 230         ptr = (struct hil_ptr *)serio->private;
 231         if (ptr == NULL) {
 232                 BUG();
 233                 return;
 234         }
 235
 236         input_unregister_device(&ptr->dev);
 237         serio_close(serio);
 238         kfree(ptr);
 239 }
 240
 241 static void hil_ptr_connect(struct serio *serio, struct serio_driver *driver)
 242 {
 243         struct hil_ptr  *ptr;
 244         char            *txt;
 245         unsigned int    i, naxsets, btntype;
 246         uint8_t         did, *idd;
 247
 248         if (serio->type != (SERIO_HIL_MLC | SERIO_HIL)) return;
 249
 250         if (!(ptr = kmalloc(sizeof(struct hil_ptr), GFP_KERNEL))) return;
 251         memset(ptr, 0, sizeof(struct hil_ptr));
 252
 253         if (serio_open(serio, driver)) goto bail0;
 254
 255         serio->private = ptr;
 256         ptr->serio = serio;
 257         ptr->dev.private = ptr;
 258
 259         init_MUTEX_LOCKED(&(ptr->sem));
 260
 261         /* Get device info.  MLC driver supplies devid/status/etc. */
 262         serio->write(serio, 0);
 263         serio->write(serio, 0);
 264         serio->write(serio, HIL_PKT_CMD >> 8);
 265         serio->write(serio, HIL_CMD_IDD);
 266         down(&(ptr->sem));
 267
 268         serio->write(serio, 0);
 269         serio->write(serio, 0);
 270         serio->write(serio, HIL_PKT_CMD >> 8);
 271         serio->write(serio, HIL_CMD_RSC);
 272         down(&(ptr->sem));
 273
 274         serio->write(serio, 0);
 275         serio->write(serio, 0);
 276         serio->write(serio, HIL_PKT_CMD >> 8);
 277         serio->write(serio, HIL_CMD_RNM);
 278         down(&(ptr->sem));
 279
 280         serio->write(serio, 0);
 281         serio->write(serio, 0);
 282         serio->write(serio, HIL_PKT_CMD >> 8);
 283         serio->write(serio, HIL_CMD_EXD);
 284         down(&(ptr->sem));
 285
 286         up(&(ptr->sem));
 287
 288         init_input_dev(&ptr->dev);
 289         did = ptr->idd[0];
 290         idd = ptr->idd + 1;
 291         txt = "unknown";
 292         if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_REL) {
 293                 ptr->dev.evbit[0] = BIT(EV_REL);
 294                 txt = "relative";
 295         }
 296
 297         if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_ABS) {
 298                 ptr->dev.evbit[0] = BIT(EV_ABS);
 299                 txt = "absolute";
 300         }
 301         if (!ptr->dev.evbit[0]) {
 302                 goto bail1;
 303         }
 304
 305         ptr->nbtn = HIL_IDD_NUM_BUTTONS(idd);
 306         if (ptr->nbtn) ptr->dev.evbit[0] |= BIT(EV_KEY);
 307
 308         naxsets = HIL_IDD_NUM_AXSETS(*idd);
 309         ptr->naxes = HIL_IDD_NUM_AXES_PER_SET(*idd);
 310
 311         printk(KERN_INFO PREFIX "HIL pointer device found (did: 0x%02x, axis: %s)\n",
 312                         did, txt);
 313         printk(KERN_INFO PREFIX "HIL pointer has %i buttons and %i sets of %i axes\n",
 314                         ptr->nbtn, naxsets, ptr->naxes);
 315
 316         btntype = BTN_MISC;
 317         if ((did & HIL_IDD_DID_ABS_TABLET_MASK) == HIL_IDD_DID_ABS_TABLET)
 318 #ifdef TABLET_SIMULATES_MOUSE
 319                 btntype = BTN_TOUCH;
 320 #else
 321                 btntype = BTN_DIGI;
 322 #endif
 323         if ((did & HIL_IDD_DID_ABS_TSCREEN_MASK) == HIL_IDD_DID_ABS_TSCREEN)
 324                 btntype = BTN_TOUCH;
 325
 326         if ((did & HIL_IDD_DID_REL_MOUSE_MASK) == HIL_IDD_DID_REL_MOUSE)
 327                 btntype = BTN_MOUSE;
 328
 329         for (i = 0; i < ptr->nbtn; i++) {
 330                 set_bit(btntype | i, ptr->dev.keybit);
 331                 ptr->btnmap[i] = btntype | i;
 332         }
 333
 334         if (btntype == BTN_MOUSE) {
 335                 /* Swap buttons 2 and 3 */
 336                 ptr->btnmap[1] = BTN_MIDDLE;
 337                 ptr->btnmap[2] = BTN_RIGHT;
 338         }
 339
 340         if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_REL) {
 341                 for (i = 0; i < ptr->naxes; i++) {
 342                         set_bit(REL_X + i, ptr->dev.relbit);
 343                 }
 344                 for (i = 3; (i < ptr->naxes + 3) && (naxsets > 1); i++) {
 345                         set_bit(REL_X + i, ptr->dev.relbit);
 346                 }
 347         } else {
 348                 for (i = 0; i < ptr->naxes; i++) {
 349                         set_bit(ABS_X + i, ptr->dev.absbit);
 350                         ptr->dev.absmin[ABS_X + i] = 0;
 351                         ptr->dev.absmax[ABS_X + i] =
 352                                 HIL_IDD_AXIS_MAX((ptr->idd + 1), i);
 353                 }
 354                 for (i = 3; (i < ptr->naxes + 3) && (naxsets > 1); i++) {
 355                         set_bit(ABS_X + i, ptr->dev.absbit);
 356                         ptr->dev.absmin[ABS_X + i] = 0;
 357                         ptr->dev.absmax[ABS_X + i] =
 358                                 HIL_IDD_AXIS_MAX((ptr->idd + 1), (i - 3));
 359                 }
 360 #ifdef TABLET_AUTOADJUST
 361                 for (i = 0; i < ABS_MAX; i++) {
 362                         int diff = ptr->dev.absmax[ABS_X + i] / 10;
 363                         ptr->dev.absmin[ABS_X + i] += diff;
 364                         ptr->dev.absmax[ABS_X + i] -= diff;
 365                 }
 366 #endif
 367         }
 368
 369         ptr->dev.name = strlen(ptr->rnm) ? ptr->rnm : HIL_GENERIC_NAME;
 370
 371         ptr->dev.id.bustype     = BUS_HIL;
 372         ptr->dev.id.vendor      = PCI_VENDOR_ID_HP;
 373         ptr->dev.id.product     = 0x0001; /* TODO: get from ptr->rsc */
 374         ptr->dev.id.version     = 0x0100; /* TODO: get from ptr->rsc */
 375         ptr->dev.dev            = &serio->dev;
 376
 377         input_register_device(&ptr->dev);
 378         printk(KERN_INFO "input: %s (%s), ID: %d\n",
 379                 ptr->dev.name,
 380                 (btntype == BTN_MOUSE) ? "HIL mouse":"HIL tablet or touchpad",
 381                 did);
 382
 383         return;
 384  bail1:
 385         serio_close(serio);
 386  bail0:
 387         kfree(ptr);
 388         return;
 389 }
 390
 391
 392 static struct serio_driver hil_ptr_serio_driver = {
 393         .driver         = {
 394                 .name   = "hil_ptr",
 395         },
 396         .description    = "HP HIL mouse/tablet driver",
 397         .connect =      hil_ptr_connect,
 398         .disconnect =   hil_ptr_disconnect,
 399         .interrupt =    hil_ptr_interrupt
 400 };
 401
 402 static int __init hil_ptr_init(void)
 403 {
 404         serio_register_driver(&hil_ptr_serio_driver);
 405         return 0;
 406 }
 407
 408 static void __exit hil_ptr_exit(void)
 409 {
 410         serio_unregister_driver(&hil_ptr_serio_driver);
 411 }
 412
 413 module_init(hil_ptr_init);
 414 module_exit(hil_ptr_exit);