2 * Copyright (C) 2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
6 * LK keyboard driver for Linux, based on sunkbd.c (C) by Vojtech Pavlik
10 * DEC LK201 and LK401 keyboard driver for Linux (primary for DECstations
11 * and VAXstations, but can also be used on any standard RS232 with an
14 * DISCLAIMER: This works for _me_. If you break anything by using the
15 * information given below, I will _not_ be liable!
17 * RJ10 pinout: To DE9: Or DB25:
18 * 1 - RxD <----> Pin 3 (TxD) <-> Pin 2 (TxD)
19 * 2 - GND <----> Pin 5 (GND) <-> Pin 7 (GND)
20 * 4 - TxD <----> Pin 2 (RxD) <-> Pin 3 (RxD)
21 * 3 - +12V (from HDD drive connector), DON'T connect to DE9 or DB25!!!
23 * Pin numbers for DE9 and DB25 are noted on the plug (quite small:). For
24 * RJ10, it's like this:
26 * __=__ Hold the plug in front of you, cable downwards,
27 * /___/| nose is hidden behind the plug. Now, pin 1 is at
28 * |1234|| the left side, pin 4 at the right and 2 and 3 are
29 * |IIII|| in between, of course:)
32 * || So the adaptor consists of three connected cables
33 * || for data transmission (RxD and TxD) and signal ground.
34 * Additionally, you have to get +12V from somewhere.
35 * Most easily, you'll get that from a floppy or HDD power connector.
36 * It's the yellow cable there (black is ground and red is +5V).
38 * The keyboard and all the commands it understands are documented in
39 * "VCB02 Video Subsystem - Technical Manual", EK-104AA-TM-001. This
40 * document is LK201 specific, but LK401 is mostly compatible. It comes
41 * up in LK201 mode and doesn't report any of the additional keys it
42 * has. These need to be switched on with the LK_CMD_ENABLE_LK401
43 * command. You'll find this document (scanned .pdf file) on MANX,
44 * a search engine specific to DEC documentation. Try
45 * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
49 * This program is free software; you can redistribute it and/or modify
50 * it under the terms of the GNU General Public License as published by
51 * the Free Software Foundation; either version 2 of the License, or
52 * (at your option) any later version.
54 * This program is distributed in the hope that it will be useful,
55 * but WITHOUT ANY WARRANTY; without even the implied warranty of
56 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
57 * GNU General Public License for more details.
59 * You should have received a copy of the GNU General Public License
60 * along with this program; if not, write to the Free Software
61 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
63 * Should you need to contact me, the author, you can do so either by
64 * email or by paper mail:
65 * Jan-Benedict Glaw, Lilienstraße 16, 33790 Hörste (near Halle/Westf.),
69 #include <linux/delay.h>
70 #include <linux/slab.h>
71 #include <linux/module.h>
72 #include <linux/moduleparam.h>
73 #include <linux/interrupt.h>
74 #include <linux/init.h>
75 #include <linux/input.h>
76 #include <linux/serio.h>
77 #include <linux/workqueue.h>
79 #define DRIVER_DESC "LK keyboard driver"
81 MODULE_AUTHOR ("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
82 MODULE_DESCRIPTION (DRIVER_DESC);
83 MODULE_LICENSE ("GPL");
91 * Please notice that there's not yet an API to set these at runtime.
93 static int bell_volume = 100; /* % */
94 module_param (bell_volume, int, 0);
95 MODULE_PARM_DESC (bell_volume, "Bell volume (in %). default is 100%");
97 static int keyclick_volume = 100; /* % */
98 module_param (keyclick_volume, int, 0);
99 MODULE_PARM_DESC (keyclick_volume, "Keyclick volume (in %), default is 100%");
101 static int ctrlclick_volume = 100; /* % */
102 module_param (ctrlclick_volume, int, 0);
103 MODULE_PARM_DESC (ctrlclick_volume, "Ctrlclick volume (in %), default is 100%");
105 static int lk201_compose_is_alt;
106 module_param (lk201_compose_is_alt, int, 0);
107 MODULE_PARM_DESC (lk201_compose_is_alt, "If set non-zero, LK201' Compose key "
108 "will act as an Alt key");
114 #define DBG(x...) printk (x)
116 #define DBG(x...) do {} while (0)
120 #define LK_LED_WAIT 0x81
121 #define LK_LED_COMPOSE 0x82
122 #define LK_LED_SHIFTLOCK 0x84
123 #define LK_LED_SCROLLLOCK 0x88
124 #define LK_CMD_LED_ON 0x13
125 #define LK_CMD_LED_OFF 0x11
128 #define LK_MODE_DOWN 0x80
129 #define LK_MODE_AUTODOWN 0x82
130 #define LK_MODE_UPDOWN 0x86
131 #define LK_CMD_SET_MODE(mode,div) ((mode) | ((div) << 3))
134 #define LK_CMD_ENABLE_KEYCLICK 0x1b
135 #define LK_CMD_DISABLE_KEYCLICK 0x99
136 #define LK_CMD_DISABLE_BELL 0xa1
137 #define LK_CMD_SOUND_BELL 0xa7
138 #define LK_CMD_ENABLE_BELL 0x23
139 #define LK_CMD_DISABLE_CTRCLICK 0xb9
140 #define LK_CMD_ENABLE_CTRCLICK 0xbb
141 #define LK_CMD_SET_DEFAULTS 0xd3
142 #define LK_CMD_POWERCYCLE_RESET 0xfd
143 #define LK_CMD_ENABLE_LK401 0xe9
144 #define LK_CMD_REQUEST_ID 0xab
146 /* Misc responses from keyboard */
147 #define LK_STUCK_KEY 0x3d
148 #define LK_SELFTEST_FAILED 0x3e
149 #define LK_ALL_KEYS_UP 0xb3
150 #define LK_METRONOME 0xb4
151 #define LK_OUTPUT_ERROR 0xb5
152 #define LK_INPUT_ERROR 0xb6
153 #define LK_KBD_LOCKED 0xb7
154 #define LK_KBD_TEST_MODE_ACK 0xb8
155 #define LK_PREFIX_KEY_DOWN 0xb9
156 #define LK_MODE_CHANGE_ACK 0xba
157 #define LK_RESPONSE_RESERVED 0xbb
159 #define LK_NUM_KEYCODES 256
160 #define LK_NUM_IGNORE_BYTES 6
161 typedef u_int16_t lk_keycode_t;
165 static lk_keycode_t lkkbd_keycode[LK_NUM_KEYCODES] = {
191 [0x8f] = KEY_PAGEDOWN,
194 [0x95] = KEY_KPENTER,
201 [0x9c] = KEY_KPCOMMA,
205 [0xa0] = KEY_KPMINUS,
214 [0xab] = KEY_RIGHTSHIFT,
215 [0xac] = KEY_LEFTALT,
216 [0xad] = KEY_COMPOSE, /* Right Compose, that is. */
217 [0xae] = KEY_LEFTSHIFT, /* Same as KEY_RIGHTSHIFT on LK201 */
218 [0xaf] = KEY_LEFTCTRL,
219 [0xb0] = KEY_CAPSLOCK,
220 [0xb1] = KEY_COMPOSE, /* Left Compose, that is. */
221 [0xb2] = KEY_RIGHTALT,
222 [0xbc] = KEY_BACKSPACE,
266 [0xf2] = KEY_SEMICOLON,
269 [0xf6] = KEY_RIGHTBRACE,
270 [0xf7] = KEY_BACKSLASH,
272 [0xfa] = KEY_LEFTBRACE,
273 [0xfb] = KEY_APOSTROPHE,
276 #define CHECK_LED(LK, VAR_ON, VAR_OFF, LED, BITS) do { \
277 if (test_bit (LED, (LK)->dev->led)) \
287 lk_keycode_t keycode[LK_NUM_KEYCODES];
289 unsigned char id[LK_NUM_IGNORE_BYTES];
290 struct input_dev *dev;
292 struct work_struct tq;
298 int ctrlclick_volume;
303 * Responses from the keyboard and mapping back to their names.
309 #define RESPONSE(x) { .value = (x), .name = #x, }
310 RESPONSE (LK_STUCK_KEY),
311 RESPONSE (LK_SELFTEST_FAILED),
312 RESPONSE (LK_ALL_KEYS_UP),
313 RESPONSE (LK_METRONOME),
314 RESPONSE (LK_OUTPUT_ERROR),
315 RESPONSE (LK_INPUT_ERROR),
316 RESPONSE (LK_KBD_LOCKED),
317 RESPONSE (LK_KBD_TEST_MODE_ACK),
318 RESPONSE (LK_PREFIX_KEY_DOWN),
319 RESPONSE (LK_MODE_CHANGE_ACK),
320 RESPONSE (LK_RESPONSE_RESERVED),
324 static unsigned char *
325 response_name (unsigned char value)
329 for (i = 0; i < ARRAY_SIZE (lk_response); i++)
330 if (lk_response[i].value == value)
331 return lk_response[i].name;
335 #endif /* LKKBD_DEBUG */
338 * Calculate volume parameter byte for a given volume.
341 volume_to_hw (int volume_percent)
343 unsigned char ret = 0;
345 if (volume_percent < 0)
347 if (volume_percent > 100)
348 volume_percent = 100;
350 if (volume_percent >= 0)
352 if (volume_percent >= 13) /* 12.5 */
354 if (volume_percent >= 25)
356 if (volume_percent >= 38) /* 37.5 */
358 if (volume_percent >= 50)
360 if (volume_percent >= 63) /* 62.5 */
361 ret = 2; /* This is the default volume */
362 if (volume_percent >= 75)
364 if (volume_percent >= 88) /* 87.5 */
373 lkkbd_detection_done (struct lkkbd *lk)
378 * Reset setting for Compose key. Let Compose be KEY_COMPOSE.
380 lk->keycode[0xb1] = KEY_COMPOSE;
383 * Print keyboard name and modify Compose=Alt on user's request.
387 strlcpy (lk->name, "DEC LK201 keyboard",
390 if (lk201_compose_is_alt)
391 lk->keycode[0xb1] = KEY_LEFTALT;
395 strlcpy (lk->name, "DEC LK401 keyboard",
400 strlcpy (lk->name, "Unknown DEC keyboard",
402 printk (KERN_ERR "lkkbd: keyboard on %s is unknown, "
403 "please report to Jan-Benedict Glaw "
404 "<jbglaw@lug-owl.de>\n", lk->phys);
405 printk (KERN_ERR "lkkbd: keyboard ID'ed as:");
406 for (i = 0; i < LK_NUM_IGNORE_BYTES; i++)
407 printk (" 0x%02x", lk->id[i]);
411 printk (KERN_INFO "lkkbd: keyboard on %s identified as: %s\n",
415 * Report errors during keyboard boot-up.
423 printk (KERN_ERR "lkkbd: Stuck key on keyboard at "
427 case LK_SELFTEST_FAILED:
428 printk (KERN_ERR "lkkbd: Selftest failed on keyboard "
429 "at %s, keyboard may not work "
430 "properly\n", lk->phys);
434 printk (KERN_ERR "lkkbd: Unknown error %02x on "
435 "keyboard at %s\n", lk->id[2],
441 * Try to hint user if there's a stuck key.
443 if (lk->id[2] == LK_STUCK_KEY && lk->id[3] != 0)
444 printk (KERN_ERR "Scancode of stuck key is 0x%02x, keycode "
445 "is 0x%04x\n", lk->id[3],
446 lk->keycode[lk->id[3]]);
452 * lkkbd_interrupt() is called by the low level driver when a character
456 lkkbd_interrupt (struct serio *serio, unsigned char data, unsigned int flags,
457 struct pt_regs *regs)
459 struct lkkbd *lk = serio_get_drvdata (serio);
462 DBG (KERN_INFO "Got byte 0x%02x\n", data);
464 if (lk->ignore_bytes > 0) {
465 DBG (KERN_INFO "Ignoring a byte on %s\n", lk->name);
466 lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data;
468 if (lk->ignore_bytes == 0)
469 lkkbd_detection_done (lk);
476 input_regs (lk->dev, regs);
477 for (i = 0; i < ARRAY_SIZE (lkkbd_keycode); i++)
478 if (lk->keycode[i] != KEY_RESERVED)
479 input_report_key (lk->dev, lk->keycode[i], 0);
480 input_sync (lk->dev);
484 DBG (KERN_INFO "Got 0x01, scheduling re-initialization\n");
485 lk->ignore_bytes = LK_NUM_IGNORE_BYTES;
486 lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data;
487 schedule_work (&lk->tq);
491 case LK_OUTPUT_ERROR:
494 case LK_KBD_TEST_MODE_ACK:
495 case LK_PREFIX_KEY_DOWN:
496 case LK_MODE_CHANGE_ACK:
497 case LK_RESPONSE_RESERVED:
498 DBG (KERN_INFO "Got %s and don't know how to handle...\n",
499 response_name (data));
503 if (lk->keycode[data] != KEY_RESERVED) {
504 input_regs (lk->dev, regs);
505 if (!test_bit (lk->keycode[data], lk->dev->key))
506 input_report_key (lk->dev, lk->keycode[data], 1);
508 input_report_key (lk->dev, lk->keycode[data], 0);
509 input_sync (lk->dev);
511 printk (KERN_WARNING "%s: Unknown key with "
512 "scancode 0x%02x on %s.\n",
513 __FILE__, data, lk->name);
520 * lkkbd_event() handles events from the input module.
523 lkkbd_event (struct input_dev *dev, unsigned int type, unsigned int code,
526 struct lkkbd *lk = dev->private;
527 unsigned char leds_on = 0;
528 unsigned char leds_off = 0;
532 CHECK_LED (lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK);
533 CHECK_LED (lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE);
534 CHECK_LED (lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK);
535 CHECK_LED (lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT);
537 lk->serio->write (lk->serio, LK_CMD_LED_ON);
538 lk->serio->write (lk->serio, leds_on);
541 lk->serio->write (lk->serio, LK_CMD_LED_OFF);
542 lk->serio->write (lk->serio, leds_off);
550 DBG ("%s: Deactivating key clicks\n", __FUNCTION__);
551 lk->serio->write (lk->serio, LK_CMD_DISABLE_KEYCLICK);
552 lk->serio->write (lk->serio, LK_CMD_DISABLE_CTRCLICK);
554 DBG ("%s: Activating key clicks\n", __FUNCTION__);
555 lk->serio->write (lk->serio, LK_CMD_ENABLE_KEYCLICK);
556 lk->serio->write (lk->serio, volume_to_hw (lk->keyclick_volume));
557 lk->serio->write (lk->serio, LK_CMD_ENABLE_CTRCLICK);
558 lk->serio->write (lk->serio, volume_to_hw (lk->ctrlclick_volume));
564 lk->serio->write (lk->serio, LK_CMD_SOUND_BELL);
571 printk (KERN_ERR "%s (): Got unknown type %d, code %d, value %d\n",
572 __FUNCTION__, type, code, value);
579 * lkkbd_reinit() sets leds and beeps to a state the computer remembers they
583 lkkbd_reinit (void *data)
585 struct lkkbd *lk = data;
587 unsigned char leds_on = 0;
588 unsigned char leds_off = 0;
591 lk->serio->write (lk->serio, LK_CMD_REQUEST_ID);
593 /* Reset parameters */
594 lk->serio->write (lk->serio, LK_CMD_SET_DEFAULTS);
597 CHECK_LED (lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK);
598 CHECK_LED (lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE);
599 CHECK_LED (lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK);
600 CHECK_LED (lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT);
602 lk->serio->write (lk->serio, LK_CMD_LED_ON);
603 lk->serio->write (lk->serio, leds_on);
606 lk->serio->write (lk->serio, LK_CMD_LED_OFF);
607 lk->serio->write (lk->serio, leds_off);
611 * Try to activate extended LK401 mode. This command will
612 * only work with a LK401 keyboard and grants access to
613 * LAlt, RAlt, RCompose and RShift.
615 lk->serio->write (lk->serio, LK_CMD_ENABLE_LK401);
617 /* Set all keys to UPDOWN mode */
618 for (division = 1; division <= 14; division++)
619 lk->serio->write (lk->serio, LK_CMD_SET_MODE (LK_MODE_UPDOWN,
622 /* Enable bell and set volume */
623 lk->serio->write (lk->serio, LK_CMD_ENABLE_BELL);
624 lk->serio->write (lk->serio, volume_to_hw (lk->bell_volume));
626 /* Enable/disable keyclick (and possibly set volume) */
627 if (test_bit (SND_CLICK, lk->dev->snd)) {
628 lk->serio->write (lk->serio, LK_CMD_ENABLE_KEYCLICK);
629 lk->serio->write (lk->serio, volume_to_hw (lk->keyclick_volume));
630 lk->serio->write (lk->serio, LK_CMD_ENABLE_CTRCLICK);
631 lk->serio->write (lk->serio, volume_to_hw (lk->ctrlclick_volume));
633 lk->serio->write (lk->serio, LK_CMD_DISABLE_KEYCLICK);
634 lk->serio->write (lk->serio, LK_CMD_DISABLE_CTRCLICK);
637 /* Sound the bell if needed */
638 if (test_bit (SND_BELL, lk->dev->snd))
639 lk->serio->write (lk->serio, LK_CMD_SOUND_BELL);
643 * lkkbd_connect() probes for a LK keyboard and fills the necessary structures.
646 lkkbd_connect (struct serio *serio, struct serio_driver *drv)
649 struct input_dev *input_dev;
653 lk = kzalloc (sizeof (struct lkkbd), GFP_KERNEL);
654 input_dev = input_allocate_device ();
655 if (!lk || !input_dev) {
662 INIT_WORK (&lk->tq, lkkbd_reinit, lk);
663 lk->bell_volume = bell_volume;
664 lk->keyclick_volume = keyclick_volume;
665 lk->ctrlclick_volume = ctrlclick_volume;
666 memcpy (lk->keycode, lkkbd_keycode, sizeof (lk_keycode_t) * LK_NUM_KEYCODES);
668 strlcpy (lk->name, "DEC LK keyboard", sizeof(lk->name));
669 snprintf (lk->phys, sizeof(lk->phys), "%s/input0", serio->phys);
671 input_dev->name = lk->name;
672 input_dev->phys = lk->phys;
673 input_dev->id.bustype = BUS_RS232;
674 input_dev->id.vendor = SERIO_LKKBD;
675 input_dev->id.product = 0;
676 input_dev->id.version = 0x0100;
677 input_dev->cdev.dev = &serio->dev;
678 input_dev->event = lkkbd_event;
679 input_dev->private = lk;
681 set_bit (EV_KEY, input_dev->evbit);
682 set_bit (EV_LED, input_dev->evbit);
683 set_bit (EV_SND, input_dev->evbit);
684 set_bit (EV_REP, input_dev->evbit);
685 set_bit (LED_CAPSL, input_dev->ledbit);
686 set_bit (LED_SLEEP, input_dev->ledbit);
687 set_bit (LED_COMPOSE, input_dev->ledbit);
688 set_bit (LED_SCROLLL, input_dev->ledbit);
689 set_bit (SND_BELL, input_dev->sndbit);
690 set_bit (SND_CLICK, input_dev->sndbit);
692 input_dev->keycode = lk->keycode;
693 input_dev->keycodesize = sizeof (lk_keycode_t);
694 input_dev->keycodemax = LK_NUM_KEYCODES;
695 for (i = 0; i < LK_NUM_KEYCODES; i++)
696 set_bit (lk->keycode[i], input_dev->keybit);
698 serio_set_drvdata (serio, lk);
700 err = serio_open (serio, drv);
704 input_register_device (lk->dev);
705 lk->serio->write (lk->serio, LK_CMD_POWERCYCLE_RESET);
709 fail: serio_set_drvdata (serio, NULL);
710 input_free_device (input_dev);
716 * lkkbd_disconnect() unregisters and closes behind us.
719 lkkbd_disconnect (struct serio *serio)
721 struct lkkbd *lk = serio_get_drvdata (serio);
723 input_get_device (lk->dev);
724 input_unregister_device (lk->dev);
726 serio_set_drvdata (serio, NULL);
727 input_put_device (lk->dev);
731 static struct serio_device_id lkkbd_serio_ids[] = {
734 .proto = SERIO_LKKBD,
741 MODULE_DEVICE_TABLE(serio, lkkbd_serio_ids);
743 static struct serio_driver lkkbd_drv = {
747 .description = DRIVER_DESC,
748 .id_table = lkkbd_serio_ids,
749 .connect = lkkbd_connect,
750 .disconnect = lkkbd_disconnect,
751 .interrupt = lkkbd_interrupt,
755 * The functions for insering/removing us as a module.
760 serio_register_driver(&lkkbd_drv);
767 serio_unregister_driver(&lkkbd_drv);
770 module_init (lkkbd_init);
771 module_exit (lkkbd_exit);