drivers/input/keyboard/hil_kbd.c

   1 /*
   2  * Generic linux-input device driver for keyboard 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 KEYB: "
  44 #define HIL_GENERIC_NAME "HIL keyboard"
  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 #define HIL_KBD_MAX_LENGTH 16
  51
  52 #define HIL_KBD_SET1_UPBIT 0x01
  53 #define HIL_KBD_SET1_SHIFT 1
  54 static unsigned int hil_kbd_set1[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
  55         { HIL_KEYCODES_SET1 };
  56
  57 #define HIL_KBD_SET2_UPBIT 0x01
  58 #define HIL_KBD_SET2_SHIFT 1
  59 /* Set2 is user defined */
  60
  61 #define HIL_KBD_SET3_UPBIT 0x80
  62 #define HIL_KBD_SET3_SHIFT 0
  63 static unsigned int hil_kbd_set3[HIL_KEYCODES_SET3_TBLSIZE] __read_mostly =
  64         { HIL_KEYCODES_SET3 };
  65
  66 static const char hil_language[][16] = { HIL_LOCALE_MAP };
  67
  68 struct hil_kbd {
  69         struct input_dev *dev;
  70         struct serio *serio;
  71
  72         /* Input buffer and index for packets from HIL bus. */
  73         hil_packet data[HIL_KBD_MAX_LENGTH];
  74         int idx4; /* four counts per packet */
  75
  76         /* Raw device info records from HIL bus, see hil.h for fields. */
  77         char    idd[HIL_KBD_MAX_LENGTH];        /* DID byte and IDD record */
  78         char    rsc[HIL_KBD_MAX_LENGTH];        /* RSC record */
  79         char    exd[HIL_KBD_MAX_LENGTH];        /* EXD record */
  80         char    rnm[HIL_KBD_MAX_LENGTH + 1];    /* RNM record + NULL term. */
  81
  82         /* Something to sleep around with. */
  83         struct semaphore sem;
  84 };
  85
  86 /* Process a complete packet after transfer from the HIL */
  87 static void hil_kbd_process_record(struct hil_kbd *kbd)
  88 {
  89         struct input_dev *dev = kbd->dev;
  90         hil_packet *data = kbd->data;
  91         hil_packet p;
  92         int idx, i, cnt;
  93
  94         idx = kbd->idx4/4;
  95         p = data[idx - 1];
  96
  97         if ((p & ~HIL_CMDCT_POL) ==
  98             (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL))
  99                 goto report;
 100         if ((p & ~HIL_CMDCT_RPL) ==
 101             (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL))
 102                 goto report;
 103
 104         /* Not a poll response.  See if we are loading config records. */
 105         switch (p & HIL_PKT_DATA_MASK) {
 106         case HIL_CMD_IDD:
 107                 for (i = 0; i < idx; i++)
 108                         kbd->idd[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 109                 for (; i < HIL_KBD_MAX_LENGTH; i++)
 110                         kbd->idd[i] = 0;
 111                 break;
 112
 113         case HIL_CMD_RSC:
 114                 for (i = 0; i < idx; i++)
 115                         kbd->rsc[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 116                 for (; i < HIL_KBD_MAX_LENGTH; i++)
 117                         kbd->rsc[i] = 0;
 118                 break;
 119
 120         case HIL_CMD_EXD:
 121                 for (i = 0; i < idx; i++)
 122                         kbd->exd[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 123                 for (; i < HIL_KBD_MAX_LENGTH; i++)
 124                         kbd->exd[i] = 0;
 125                 break;
 126
 127         case HIL_CMD_RNM:
 128                 for (i = 0; i < idx; i++)
 129                         kbd->rnm[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 130                 for (; i < HIL_KBD_MAX_LENGTH + 1; i++)
 131                         kbd->rnm[i] = '\0';
 132                 break;
 133
 134         default:
 135                 /* These occur when device isn't present */
 136                 if (p == (HIL_ERR_INT | HIL_PKT_CMD))
 137                         break;
 138                 /* Anything else we'd like to know about. */
 139                 printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
 140                 break;
 141         }
 142         goto out;
 143
 144  report:
 145         cnt = 1;
 146         switch (kbd->data[0] & HIL_POL_CHARTYPE_MASK) {
 147         case HIL_POL_CHARTYPE_NONE:
 148                 break;
 149
 150         case HIL_POL_CHARTYPE_ASCII:
 151                 while (cnt < idx - 1)
 152                         input_report_key(dev, kbd->data[cnt++] & 0x7f, 1);
 153                 break;
 154
 155         case HIL_POL_CHARTYPE_RSVD1:
 156         case HIL_POL_CHARTYPE_RSVD2:
 157         case HIL_POL_CHARTYPE_BINARY:
 158                 while (cnt < idx - 1)
 159                         input_report_key(dev, kbd->data[cnt++], 1);
 160                 break;
 161
 162         case HIL_POL_CHARTYPE_SET1:
 163                 while (cnt < idx - 1) {
 164                         unsigned int key;
 165                         int up;
 166                         key = kbd->data[cnt++];
 167                         up = key & HIL_KBD_SET1_UPBIT;
 168                         key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 169                         key = hil_kbd_set1[key >> HIL_KBD_SET1_SHIFT];
 170                         if (key != KEY_RESERVED)
 171                                 input_report_key(dev, key, !up);
 172                 }
 173                 break;
 174
 175         case HIL_POL_CHARTYPE_SET2:
 176                 while (cnt < idx - 1) {
 177                         unsigned int key;
 178                         int up;
 179                         key = kbd->data[cnt++];
 180                         up = key & HIL_KBD_SET2_UPBIT;
 181                         key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 182                         key = key >> HIL_KBD_SET2_SHIFT;
 183                         if (key != KEY_RESERVED)
 184                                 input_report_key(dev, key, !up);
 185                 }
 186                 break;
 187
 188         case HIL_POL_CHARTYPE_SET3:
 189                 while (cnt < idx - 1) {
 190                         unsigned int key;
 191                         int up;
 192                         key = kbd->data[cnt++];
 193                         up = key & HIL_KBD_SET3_UPBIT;
 194                         key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 195                         key = hil_kbd_set3[key >> HIL_KBD_SET3_SHIFT];
 196                         if (key != KEY_RESERVED)
 197                                 input_report_key(dev, key, !up);
 198                 }
 199                 break;
 200         }
 201  out:
 202         kbd->idx4 = 0;
 203         up(&kbd->sem);
 204 }
 205
 206 static void hil_kbd_process_err(struct hil_kbd *kbd)
 207 {
 208         printk(KERN_WARNING PREFIX "errored HIL packet\n");
 209         kbd->idx4 = 0;
 210         up(&kbd->sem);
 211 }
 212
 213 static irqreturn_t hil_kbd_interrupt(struct serio *serio,
 214                                 unsigned char data, unsigned int flags)
 215 {
 216         struct hil_kbd *kbd;
 217         hil_packet packet;
 218         int idx;
 219
 220         kbd = serio_get_drvdata(serio);
 221         BUG_ON(kbd == NULL);
 222
 223         if (kbd->idx4 >= (HIL_KBD_MAX_LENGTH * sizeof(hil_packet))) {
 224                 hil_kbd_process_err(kbd);
 225                 return IRQ_HANDLED;
 226         }
 227         idx = kbd->idx4/4;
 228         if (!(kbd->idx4 % 4))
 229                 kbd->data[idx] = 0;
 230         packet = kbd->data[idx];
 231         packet |= ((hil_packet)data) << ((3 - (kbd->idx4 % 4)) * 8);
 232         kbd->data[idx] = packet;
 233
 234         /* Records of N 4-byte hil_packets must terminate with a command. */
 235         if ((++(kbd->idx4)) % 4)
 236                 return IRQ_HANDLED;
 237         if ((packet & 0xffff0000) != HIL_ERR_INT) {
 238                 hil_kbd_process_err(kbd);
 239                 return IRQ_HANDLED;
 240         }
 241         if (packet & HIL_PKT_CMD)
 242                 hil_kbd_process_record(kbd);
 243         return IRQ_HANDLED;
 244 }
 245
 246 static void hil_kbd_disconnect(struct serio *serio)
 247 {
 248         struct hil_kbd *kbd;
 249
 250         kbd = serio_get_drvdata(serio);
 251         BUG_ON(kbd == NULL);
 252
 253         serio_close(serio);
 254         input_unregister_device(kbd->dev);
 255         kfree(kbd);
 256 }
 257
 258 static int hil_kbd_connect(struct serio *serio, struct serio_driver *drv)
 259 {
 260         struct hil_kbd  *kbd;
 261         uint8_t         did, *idd;
 262         int             i;
 263
 264         kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
 265         if (!kbd)
 266                 return -ENOMEM;
 267
 268         kbd->dev = input_allocate_device();
 269         if (!kbd->dev)
 270                 goto bail0;
 271
 272         if (serio_open(serio, drv))
 273                 goto bail1;
 274
 275         serio_set_drvdata(serio, kbd);
 276         kbd->serio = serio;
 277
 278         init_MUTEX_LOCKED(&kbd->sem);
 279
 280         /* Get device info.  MLC driver supplies devid/status/etc. */
 281         serio->write(serio, 0);
 282         serio->write(serio, 0);
 283         serio->write(serio, HIL_PKT_CMD >> 8);
 284         serio->write(serio, HIL_CMD_IDD);
 285         down(&kbd->sem);
 286
 287         serio->write(serio, 0);
 288         serio->write(serio, 0);
 289         serio->write(serio, HIL_PKT_CMD >> 8);
 290         serio->write(serio, HIL_CMD_RSC);
 291         down(&kbd->sem);
 292
 293         serio->write(serio, 0);
 294         serio->write(serio, 0);
 295         serio->write(serio, HIL_PKT_CMD >> 8);
 296         serio->write(serio, HIL_CMD_RNM);
 297         down(&kbd->sem);
 298
 299         serio->write(serio, 0);
 300         serio->write(serio, 0);
 301         serio->write(serio, HIL_PKT_CMD >> 8);
 302         serio->write(serio, HIL_CMD_EXD);
 303         down(&kbd->sem);
 304
 305         up(&kbd->sem);
 306
 307         did = kbd->idd[0];
 308         idd = kbd->idd + 1;
 309         switch (did & HIL_IDD_DID_TYPE_MASK) {
 310         case HIL_IDD_DID_TYPE_KB_INTEGRAL:
 311         case HIL_IDD_DID_TYPE_KB_ITF:
 312         case HIL_IDD_DID_TYPE_KB_RSVD:
 313         case HIL_IDD_DID_TYPE_CHAR:
 314                 printk(KERN_INFO PREFIX "HIL keyboard found (did = 0x%02x, lang = %s)\n",
 315                         did, hil_language[did & HIL_IDD_DID_TYPE_KB_LANG_MASK]);
 316                 break;
 317         default:
 318                 goto bail2;
 319         }
 320
 321         if (HIL_IDD_NUM_BUTTONS(idd) || HIL_IDD_NUM_AXES_PER_SET(*idd)) {
 322                 printk(KERN_INFO PREFIX "keyboards only, no combo devices supported.\n");
 323                 goto bail2;
 324         }
 325
 326         kbd->dev->evbit[0]      = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 327         kbd->dev->ledbit[0]     = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
 328                 BIT_MASK(LED_SCROLLL);
 329         kbd->dev->keycodemax    = HIL_KEYCODES_SET1_TBLSIZE;
 330         kbd->dev->keycodesize   = sizeof(hil_kbd_set1[0]);
 331         kbd->dev->keycode       = hil_kbd_set1;
 332         kbd->dev->name          = strlen(kbd->rnm) ? kbd->rnm : HIL_GENERIC_NAME;
 333         kbd->dev->phys          = "hpkbd/input0";       /* XXX */
 334
 335         kbd->dev->id.bustype    = BUS_HIL;
 336         kbd->dev->id.vendor     = PCI_VENDOR_ID_HP;
 337         kbd->dev->id.product    = 0x0001; /* TODO: get from kbd->rsc */
 338         kbd->dev->id.version    = 0x0100; /* TODO: get from kbd->rsc */
 339         kbd->dev->dev.parent    = &serio->dev;
 340
 341         for (i = 0; i < 128; i++) {
 342                 set_bit(hil_kbd_set1[i], kbd->dev->keybit);
 343                 set_bit(hil_kbd_set3[i], kbd->dev->keybit);
 344         }
 345         clear_bit(0, kbd->dev->keybit);
 346
 347         input_register_device(kbd->dev);
 348         printk(KERN_INFO "input: %s, ID: %d\n",
 349                 kbd->dev->name, did);
 350
 351         serio->write(serio, 0);
 352         serio->write(serio, 0);
 353         serio->write(serio, HIL_PKT_CMD >> 8);
 354         serio->write(serio, HIL_CMD_EK1); /* Enable Keyswitch Autorepeat 1 */
 355         down(&kbd->sem);
 356         up(&kbd->sem);
 357
 358         return 0;
 359  bail2:
 360         serio_close(serio);
 361         serio_set_drvdata(serio, NULL);
 362  bail1:
 363         input_free_device(kbd->dev);
 364  bail0:
 365         kfree(kbd);
 366         return -EIO;
 367 }
 368
 369 static struct serio_device_id hil_kbd_ids[] = {
 370         {
 371                 .type = SERIO_HIL_MLC,
 372                 .proto = SERIO_HIL,
 373                 .id = SERIO_ANY,
 374                 .extra = SERIO_ANY,
 375         },
 376         { 0 }
 377 };
 378
 379 static struct serio_driver hil_kbd_serio_drv = {
 380         .driver         = {
 381                 .name   = "hil_kbd",
 382         },
 383         .description    = "HP HIL keyboard driver",
 384         .id_table       = hil_kbd_ids,
 385         .connect        = hil_kbd_connect,
 386         .disconnect     = hil_kbd_disconnect,
 387         .interrupt      = hil_kbd_interrupt
 388 };
 389
 390 static int __init hil_kbd_init(void)
 391 {
 392         return serio_register_driver(&hil_kbd_serio_drv);
 393 }
 394
 395 static void __exit hil_kbd_exit(void)
 396 {
 397         serio_unregister_driver(&hil_kbd_serio_drv);
 398 }
 399
 400 module_init(hil_kbd_init);
 401 module_exit(hil_kbd_exit);