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0001 /*
0002  * Generic linux-input device driver for keyboard devices
0003  *
0004  * Copyright (c) 2001 Brian S. Julin
0005  * All rights reserved.
0006  *
0007  * Redistribution and use in source and binary forms, with or without
0008  * modification, are permitted provided that the following conditions
0009  * are met:
0010  * 1. Redistributions of source code must retain the above copyright
0011  *    notice, this list of conditions, and the following disclaimer,
0012  *    without modification.
0013  * 2. The name of the author may not be used to endorse or promote products
0014  *    derived from this software without specific prior written permission.
0015  *
0016  * Alternatively, this software may be distributed under the terms of the
0017  * GNU General Public License ("GPL").
0018  *
0019  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
0020  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0021  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0022  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
0023  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
0024  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
0025  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0026  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
0027  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
0028  *
0029  * References:
0030  * HP-HIL Technical Reference Manual.  Hewlett Packard Product No. 45918A
0031  *
0032  */
0033 
0034 #include <linux/hil.h>
0035 #include <linux/input.h>
0036 #include <linux/serio.h>
0037 #include <linux/kernel.h>
0038 #include <linux/module.h>
0039 #include <linux/completion.h>
0040 #include <linux/slab.h>
0041 #include <linux/pci_ids.h>
0042 
0043 #define PREFIX "HIL: "
0044 
0045 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
0046 MODULE_DESCRIPTION("HIL keyboard/mouse driver");
0047 MODULE_LICENSE("Dual BSD/GPL");
0048 MODULE_ALIAS("serio:ty03pr25id00ex*"); /* HIL keyboard */
0049 MODULE_ALIAS("serio:ty03pr25id0Fex*"); /* HIL mouse */
0050 
0051 #define HIL_PACKET_MAX_LENGTH 16
0052 
0053 #define HIL_KBD_SET1_UPBIT 0x01
0054 #define HIL_KBD_SET1_SHIFT 1
0055 static unsigned int hil_kbd_set1[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
0056     { HIL_KEYCODES_SET1 };
0057 
0058 #define HIL_KBD_SET2_UPBIT 0x01
0059 #define HIL_KBD_SET2_SHIFT 1
0060 /* Set2 is user defined */
0061 
0062 #define HIL_KBD_SET3_UPBIT 0x80
0063 #define HIL_KBD_SET3_SHIFT 0
0064 static unsigned int hil_kbd_set3[HIL_KEYCODES_SET3_TBLSIZE] __read_mostly =
0065     { HIL_KEYCODES_SET3 };
0066 
0067 static const char hil_language[][16] = { HIL_LOCALE_MAP };
0068 
0069 struct hil_dev {
0070     struct input_dev *dev;
0071     struct serio *serio;
0072 
0073     /* Input buffer and index for packets from HIL bus. */
0074     hil_packet data[HIL_PACKET_MAX_LENGTH];
0075     int idx4; /* four counts per packet */
0076 
0077     /* Raw device info records from HIL bus, see hil.h for fields. */
0078     char    idd[HIL_PACKET_MAX_LENGTH]; /* DID byte and IDD record */
0079     char    rsc[HIL_PACKET_MAX_LENGTH]; /* RSC record */
0080     char    exd[HIL_PACKET_MAX_LENGTH]; /* EXD record */
0081     char    rnm[HIL_PACKET_MAX_LENGTH + 1]; /* RNM record + NULL term. */
0082 
0083     struct completion cmd_done;
0084 
0085     bool is_pointer;
0086     /* Extra device details needed for pointing devices. */
0087     unsigned int nbtn, naxes;
0088     unsigned int btnmap[7];
0089 };
0090 
0091 static bool hil_dev_is_command_response(hil_packet p)
0092 {
0093     if ((p & ~HIL_CMDCT_POL) == (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL))
0094         return false;
0095 
0096     if ((p & ~HIL_CMDCT_RPL) == (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL))
0097         return false;
0098 
0099     return true;
0100 }
0101 
0102 static void hil_dev_handle_command_response(struct hil_dev *dev)
0103 {
0104     hil_packet p;
0105     char *buf;
0106     int i, idx;
0107 
0108     idx = dev->idx4 / 4;
0109     p = dev->data[idx - 1];
0110 
0111     switch (p & HIL_PKT_DATA_MASK) {
0112     case HIL_CMD_IDD:
0113         buf = dev->idd;
0114         break;
0115 
0116     case HIL_CMD_RSC:
0117         buf = dev->rsc;
0118         break;
0119 
0120     case HIL_CMD_EXD:
0121         buf = dev->exd;
0122         break;
0123 
0124     case HIL_CMD_RNM:
0125         dev->rnm[HIL_PACKET_MAX_LENGTH] = 0;
0126         buf = dev->rnm;
0127         break;
0128 
0129     default:
0130         /* These occur when device isn't present */
0131         if (p != (HIL_ERR_INT | HIL_PKT_CMD)) {
0132             /* Anything else we'd like to know about. */
0133             printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
0134         }
0135         goto out;
0136     }
0137 
0138     for (i = 0; i < idx; i++)
0139         buf[i] = dev->data[i] & HIL_PKT_DATA_MASK;
0140     for (; i < HIL_PACKET_MAX_LENGTH; i++)
0141         buf[i] = 0;
0142  out:
0143     complete(&dev->cmd_done);
0144 }
0145 
0146 static void hil_dev_handle_kbd_events(struct hil_dev *kbd)
0147 {
0148     struct input_dev *dev = kbd->dev;
0149     int idx = kbd->idx4 / 4;
0150     int i;
0151 
0152     switch (kbd->data[0] & HIL_POL_CHARTYPE_MASK) {
0153     case HIL_POL_CHARTYPE_NONE:
0154         return;
0155 
0156     case HIL_POL_CHARTYPE_ASCII:
0157         for (i = 1; i < idx - 1; i++)
0158             input_report_key(dev, kbd->data[i] & 0x7f, 1);
0159         break;
0160 
0161     case HIL_POL_CHARTYPE_RSVD1:
0162     case HIL_POL_CHARTYPE_RSVD2:
0163     case HIL_POL_CHARTYPE_BINARY:
0164         for (i = 1; i < idx - 1; i++)
0165             input_report_key(dev, kbd->data[i], 1);
0166         break;
0167 
0168     case HIL_POL_CHARTYPE_SET1:
0169         for (i = 1; i < idx - 1; i++) {
0170             unsigned int key = kbd->data[i];
0171             int up = key & HIL_KBD_SET1_UPBIT;
0172 
0173             key &= (~HIL_KBD_SET1_UPBIT & 0xff);
0174             key = hil_kbd_set1[key >> HIL_KBD_SET1_SHIFT];
0175             input_report_key(dev, key, !up);
0176         }
0177         break;
0178 
0179     case HIL_POL_CHARTYPE_SET2:
0180         for (i = 1; i < idx - 1; i++) {
0181             unsigned int key = kbd->data[i];
0182             int up = key & HIL_KBD_SET2_UPBIT;
0183 
0184             key &= (~HIL_KBD_SET1_UPBIT & 0xff);
0185             key = key >> HIL_KBD_SET2_SHIFT;
0186             input_report_key(dev, key, !up);
0187         }
0188         break;
0189 
0190     case HIL_POL_CHARTYPE_SET3:
0191         for (i = 1; i < idx - 1; i++) {
0192             unsigned int key = kbd->data[i];
0193             int up = key & HIL_KBD_SET3_UPBIT;
0194 
0195             key &= (~HIL_KBD_SET1_UPBIT & 0xff);
0196             key = hil_kbd_set3[key >> HIL_KBD_SET3_SHIFT];
0197             input_report_key(dev, key, !up);
0198         }
0199         break;
0200     }
0201 
0202     input_sync(dev);
0203 }
0204 
0205 static void hil_dev_handle_ptr_events(struct hil_dev *ptr)
0206 {
0207     struct input_dev *dev = ptr->dev;
0208     int idx = ptr->idx4 / 4;
0209     hil_packet p = ptr->data[idx - 1];
0210     int i, cnt, laxis;
0211     bool absdev, ax16;
0212 
0213     if ((p & HIL_CMDCT_POL) != idx - 1) {
0214         printk(KERN_WARNING PREFIX
0215             "Malformed poll packet %x (idx = %i)\n", p, idx);
0216         return;
0217     }
0218 
0219     i = (p & HIL_POL_AXIS_ALT) ? 3 : 0;
0220     laxis = (p & HIL_POL_NUM_AXES_MASK) + i;
0221 
0222     ax16 = ptr->idd[1] & HIL_IDD_HEADER_16BIT; /* 8 or 16bit resolution */
0223     absdev = ptr->idd[1] & HIL_IDD_HEADER_ABS;
0224 
0225     for (cnt = 1; i < laxis; i++) {
0226         unsigned int lo, hi, val;
0227 
0228         lo = ptr->data[cnt++] & HIL_PKT_DATA_MASK;
0229         hi = ax16 ? (ptr->data[cnt++] & HIL_PKT_DATA_MASK) : 0;
0230 
0231         if (absdev) {
0232             val = lo + (hi << 8);
0233 #ifdef TABLET_AUTOADJUST
0234             if (val < input_abs_get_min(dev, ABS_X + i))
0235                 input_abs_set_min(dev, ABS_X + i, val);
0236             if (val > input_abs_get_max(dev, ABS_X + i))
0237                 input_abs_set_max(dev, ABS_X + i, val);
0238 #endif
0239             if (i % 3)
0240                 val = input_abs_get_max(dev, ABS_X + i) - val;
0241             input_report_abs(dev, ABS_X + i, val);
0242         } else {
0243             val = (int) (((int8_t) lo) | ((int8_t) hi << 8));
0244             if (i % 3)
0245                 val *= -1;
0246             input_report_rel(dev, REL_X + i, val);
0247         }
0248     }
0249 
0250     while (cnt < idx - 1) {
0251         unsigned int btn = ptr->data[cnt++];
0252         int up = btn & 1;
0253 
0254         btn &= 0xfe;
0255         if (btn == 0x8e)
0256             continue; /* TODO: proximity == touch? */
0257         if (btn > 0x8c || btn < 0x80)
0258             continue;
0259         btn = (btn - 0x80) >> 1;
0260         btn = ptr->btnmap[btn];
0261         input_report_key(dev, btn, !up);
0262     }
0263 
0264     input_sync(dev);
0265 }
0266 
0267 static void hil_dev_process_err(struct hil_dev *dev)
0268 {
0269     printk(KERN_WARNING PREFIX "errored HIL packet\n");
0270     dev->idx4 = 0;
0271     complete(&dev->cmd_done); /* just in case somebody is waiting */
0272 }
0273 
0274 static irqreturn_t hil_dev_interrupt(struct serio *serio,
0275                 unsigned char data, unsigned int flags)
0276 {
0277     struct hil_dev *dev;
0278     hil_packet packet;
0279     int idx;
0280 
0281     dev = serio_get_drvdata(serio);
0282     BUG_ON(dev == NULL);
0283 
0284     if (dev->idx4 >= HIL_PACKET_MAX_LENGTH * sizeof(hil_packet)) {
0285         hil_dev_process_err(dev);
0286         goto out;
0287     }
0288 
0289     idx = dev->idx4 / 4;
0290     if (!(dev->idx4 % 4))
0291         dev->data[idx] = 0;
0292     packet = dev->data[idx];
0293     packet |= ((hil_packet)data) << ((3 - (dev->idx4 % 4)) * 8);
0294     dev->data[idx] = packet;
0295 
0296     /* Records of N 4-byte hil_packets must terminate with a command. */
0297     if ((++dev->idx4 % 4) == 0) {
0298         if ((packet & 0xffff0000) != HIL_ERR_INT) {
0299             hil_dev_process_err(dev);
0300         } else if (packet & HIL_PKT_CMD) {
0301             if (hil_dev_is_command_response(packet))
0302                 hil_dev_handle_command_response(dev);
0303             else if (dev->is_pointer)
0304                 hil_dev_handle_ptr_events(dev);
0305             else
0306                 hil_dev_handle_kbd_events(dev);
0307             dev->idx4 = 0;
0308         }
0309     }
0310  out:
0311     return IRQ_HANDLED;
0312 }
0313 
0314 static void hil_dev_disconnect(struct serio *serio)
0315 {
0316     struct hil_dev *dev = serio_get_drvdata(serio);
0317 
0318     BUG_ON(dev == NULL);
0319 
0320     serio_close(serio);
0321     input_unregister_device(dev->dev);
0322     serio_set_drvdata(serio, NULL);
0323     kfree(dev);
0324 }
0325 
0326 static void hil_dev_keyboard_setup(struct hil_dev *kbd)
0327 {
0328     struct input_dev *input_dev = kbd->dev;
0329     uint8_t did = kbd->idd[0];
0330     int i;
0331 
0332     input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
0333     input_dev->ledbit[0]    = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
0334                   BIT_MASK(LED_SCROLLL);
0335 
0336     for (i = 0; i < 128; i++) {
0337         __set_bit(hil_kbd_set1[i], input_dev->keybit);
0338         __set_bit(hil_kbd_set3[i], input_dev->keybit);
0339     }
0340     __clear_bit(KEY_RESERVED, input_dev->keybit);
0341 
0342     input_dev->keycodemax   = HIL_KEYCODES_SET1_TBLSIZE;
0343     input_dev->keycodesize  = sizeof(hil_kbd_set1[0]);
0344     input_dev->keycode  = hil_kbd_set1;
0345 
0346     input_dev->name = strlen(kbd->rnm) ? kbd->rnm : "HIL keyboard";
0347     input_dev->phys = "hpkbd/input0";
0348 
0349     printk(KERN_INFO PREFIX "HIL keyboard found (did = 0x%02x, lang = %s)\n",
0350         did, hil_language[did & HIL_IDD_DID_TYPE_KB_LANG_MASK]);
0351 }
0352 
0353 static void hil_dev_pointer_setup(struct hil_dev *ptr)
0354 {
0355     struct input_dev *input_dev = ptr->dev;
0356     uint8_t did = ptr->idd[0];
0357     uint8_t *idd = ptr->idd + 1;
0358     unsigned int naxsets = HIL_IDD_NUM_AXSETS(*idd);
0359     unsigned int i, btntype;
0360     const char *txt;
0361 
0362     ptr->naxes = HIL_IDD_NUM_AXES_PER_SET(*idd);
0363 
0364     switch (did & HIL_IDD_DID_TYPE_MASK) {
0365     case HIL_IDD_DID_TYPE_REL:
0366         input_dev->evbit[0] = BIT_MASK(EV_REL);
0367 
0368         for (i = 0; i < ptr->naxes; i++)
0369             __set_bit(REL_X + i, input_dev->relbit);
0370 
0371         for (i = 3; naxsets > 1 && i < ptr->naxes + 3; i++)
0372             __set_bit(REL_X + i, input_dev->relbit);
0373 
0374         txt = "relative";
0375         break;
0376 
0377     case HIL_IDD_DID_TYPE_ABS:
0378         input_dev->evbit[0] = BIT_MASK(EV_ABS);
0379 
0380         for (i = 0; i < ptr->naxes; i++)
0381             input_set_abs_params(input_dev, ABS_X + i,
0382                     0, HIL_IDD_AXIS_MAX(idd, i), 0, 0);
0383 
0384         for (i = 3; naxsets > 1 && i < ptr->naxes + 3; i++)
0385             input_set_abs_params(input_dev, ABS_X + i,
0386                     0, HIL_IDD_AXIS_MAX(idd, i - 3), 0, 0);
0387 
0388 #ifdef TABLET_AUTOADJUST
0389         for (i = 0; i < ABS_MAX; i++) {
0390             int diff = input_abs_get_max(input_dev, ABS_X + i) / 10;
0391             input_abs_set_min(input_dev, ABS_X + i,
0392                 input_abs_get_min(input_dev, ABS_X + i) + diff);
0393             input_abs_set_max(input_dev, ABS_X + i,
0394                 input_abs_get_max(input_dev, ABS_X + i) - diff);
0395         }
0396 #endif
0397 
0398         txt = "absolute";
0399         break;
0400 
0401     default:
0402         BUG();
0403     }
0404 
0405     ptr->nbtn = HIL_IDD_NUM_BUTTONS(idd);
0406     if (ptr->nbtn)
0407         input_dev->evbit[0] |= BIT_MASK(EV_KEY);
0408 
0409     btntype = BTN_MISC;
0410     if ((did & HIL_IDD_DID_ABS_TABLET_MASK) == HIL_IDD_DID_ABS_TABLET)
0411 #ifdef TABLET_SIMULATES_MOUSE
0412         btntype = BTN_TOUCH;
0413 #else
0414         btntype = BTN_DIGI;
0415 #endif
0416     if ((did & HIL_IDD_DID_ABS_TSCREEN_MASK) == HIL_IDD_DID_ABS_TSCREEN)
0417         btntype = BTN_TOUCH;
0418 
0419     if ((did & HIL_IDD_DID_REL_MOUSE_MASK) == HIL_IDD_DID_REL_MOUSE)
0420         btntype = BTN_MOUSE;
0421 
0422     for (i = 0; i < ptr->nbtn; i++) {
0423         __set_bit(btntype | i, input_dev->keybit);
0424         ptr->btnmap[i] = btntype | i;
0425     }
0426 
0427     if (btntype == BTN_MOUSE) {
0428         /* Swap buttons 2 and 3 */
0429         ptr->btnmap[1] = BTN_MIDDLE;
0430         ptr->btnmap[2] = BTN_RIGHT;
0431     }
0432 
0433     input_dev->name = strlen(ptr->rnm) ? ptr->rnm : "HIL pointer device";
0434 
0435     printk(KERN_INFO PREFIX
0436         "HIL pointer device found (did: 0x%02x, axis: %s)\n",
0437         did, txt);
0438     printk(KERN_INFO PREFIX
0439         "HIL pointer has %i buttons and %i sets of %i axes\n",
0440         ptr->nbtn, naxsets, ptr->naxes);
0441 }
0442 
0443 static int hil_dev_connect(struct serio *serio, struct serio_driver *drv)
0444 {
0445     struct hil_dev *dev;
0446     struct input_dev *input_dev;
0447     uint8_t did, *idd;
0448     int error;
0449 
0450     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
0451     input_dev = input_allocate_device();
0452     if (!dev || !input_dev) {
0453         error = -ENOMEM;
0454         goto bail0;
0455     }
0456 
0457     dev->serio = serio;
0458     dev->dev = input_dev;
0459 
0460     error = serio_open(serio, drv);
0461     if (error)
0462         goto bail0;
0463 
0464     serio_set_drvdata(serio, dev);
0465 
0466     /* Get device info.  MLC driver supplies devid/status/etc. */
0467     init_completion(&dev->cmd_done);
0468     serio_write(serio, 0);
0469     serio_write(serio, 0);
0470     serio_write(serio, HIL_PKT_CMD >> 8);
0471     serio_write(serio, HIL_CMD_IDD);
0472     error = wait_for_completion_killable(&dev->cmd_done);
0473     if (error)
0474         goto bail1;
0475 
0476     reinit_completion(&dev->cmd_done);
0477     serio_write(serio, 0);
0478     serio_write(serio, 0);
0479     serio_write(serio, HIL_PKT_CMD >> 8);
0480     serio_write(serio, HIL_CMD_RSC);
0481     error = wait_for_completion_killable(&dev->cmd_done);
0482     if (error)
0483         goto bail1;
0484 
0485     reinit_completion(&dev->cmd_done);
0486     serio_write(serio, 0);
0487     serio_write(serio, 0);
0488     serio_write(serio, HIL_PKT_CMD >> 8);
0489     serio_write(serio, HIL_CMD_RNM);
0490     error = wait_for_completion_killable(&dev->cmd_done);
0491     if (error)
0492         goto bail1;
0493 
0494     reinit_completion(&dev->cmd_done);
0495     serio_write(serio, 0);
0496     serio_write(serio, 0);
0497     serio_write(serio, HIL_PKT_CMD >> 8);
0498     serio_write(serio, HIL_CMD_EXD);
0499     error = wait_for_completion_killable(&dev->cmd_done);
0500     if (error)
0501         goto bail1;
0502 
0503     did = dev->idd[0];
0504     idd = dev->idd + 1;
0505 
0506     switch (did & HIL_IDD_DID_TYPE_MASK) {
0507     case HIL_IDD_DID_TYPE_KB_INTEGRAL:
0508     case HIL_IDD_DID_TYPE_KB_ITF:
0509     case HIL_IDD_DID_TYPE_KB_RSVD:
0510     case HIL_IDD_DID_TYPE_CHAR:
0511         if (HIL_IDD_NUM_BUTTONS(idd) ||
0512             HIL_IDD_NUM_AXES_PER_SET(*idd)) {
0513             printk(KERN_INFO PREFIX
0514                 "combo devices are not supported.\n");
0515             error = -EINVAL;
0516             goto bail1;
0517         }
0518 
0519         dev->is_pointer = false;
0520         hil_dev_keyboard_setup(dev);
0521         break;
0522 
0523     case HIL_IDD_DID_TYPE_REL:
0524     case HIL_IDD_DID_TYPE_ABS:
0525         dev->is_pointer = true;
0526         hil_dev_pointer_setup(dev);
0527         break;
0528 
0529     default:
0530         goto bail1;
0531     }
0532 
0533     input_dev->id.bustype   = BUS_HIL;
0534     input_dev->id.vendor    = PCI_VENDOR_ID_HP;
0535     input_dev->id.product   = 0x0001; /* TODO: get from kbd->rsc */
0536     input_dev->id.version   = 0x0100; /* TODO: get from kbd->rsc */
0537     input_dev->dev.parent   = &serio->dev;
0538 
0539     if (!dev->is_pointer) {
0540         serio_write(serio, 0);
0541         serio_write(serio, 0);
0542         serio_write(serio, HIL_PKT_CMD >> 8);
0543         /* Enable Keyswitch Autorepeat 1 */
0544         serio_write(serio, HIL_CMD_EK1);
0545         /* No need to wait for completion */
0546     }
0547 
0548     error = input_register_device(input_dev);
0549     if (error)
0550         goto bail1;
0551 
0552     return 0;
0553 
0554  bail1:
0555     serio_close(serio);
0556     serio_set_drvdata(serio, NULL);
0557  bail0:
0558     input_free_device(input_dev);
0559     kfree(dev);
0560     return error;
0561 }
0562 
0563 static const struct serio_device_id hil_dev_ids[] = {
0564     {
0565         .type = SERIO_HIL_MLC,
0566         .proto = SERIO_HIL,
0567         .id = SERIO_ANY,
0568         .extra = SERIO_ANY,
0569     },
0570     { 0 }
0571 };
0572 
0573 MODULE_DEVICE_TABLE(serio, hil_dev_ids);
0574 
0575 static struct serio_driver hil_serio_drv = {
0576     .driver     = {
0577         .name   = "hil_dev",
0578     },
0579     .description    = "HP HIL keyboard/mouse/tablet driver",
0580     .id_table   = hil_dev_ids,
0581     .connect    = hil_dev_connect,
0582     .disconnect = hil_dev_disconnect,
0583     .interrupt  = hil_dev_interrupt
0584 };
0585 
0586 module_serio_driver(hil_serio_drv);
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