summaryrefslogblamecommitdiffstats
path: root/drivers/tc/lk201.c
blob: 757dec9c7ee9fc89b11d05dd7253ea3993c70eb8 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440









                                                                             













































































































































































































































































































































































































































                                                                               
/*
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1999-2002 Harald Koerfgen <hkoerfg@web.de>
 * Copyright (C) 2001, 2002, 2003, 2004  Maciej W. Rozycki
 */


#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kbd_ll.h>
#include <linux/kbd_kern.h>
#include <linux/vt_kern.h>

#include <asm/keyboard.h>
#include <asm/dec/tc.h>
#include <asm/dec/machtype.h>
#include <asm/dec/serial.h>

#include "lk201.h"

/*
 * Only handle DECstations that have an LK201 interface.
 * Maxine uses LK501 at the Access.Bus and various DECsystems
 * have no keyboard interface at all.
 */
#define LK_IFACE	(mips_machtype == MACH_DS23100    || \
			 mips_machtype == MACH_DS5000_200 || \
			 mips_machtype == MACH_DS5000_1XX || \
			 mips_machtype == MACH_DS5000_2X0)
/*
 * These use the Z8530 SCC.  Others use the DZ11.
 */
#define LK_IFACE_ZS	(mips_machtype == MACH_DS5000_1XX || \
			 mips_machtype == MACH_DS5000_2X0)

/* Simple translation table for the SysRq keys */

#ifdef CONFIG_MAGIC_SYSRQ
/*
 * Actually no translation at all, at least until we figure out
 * how to define SysRq for LK201 and friends. --macro
 */
unsigned char lk201_sysrq_xlate[128];
unsigned char *kbd_sysrq_xlate = lk201_sysrq_xlate;

unsigned char kbd_sysrq_key = -1;
#endif

#define KEYB_LINE	3

static int __init lk201_init(void *);
static void __init lk201_info(void *);
static void lk201_rx_char(unsigned char, unsigned char);

static struct dec_serial_hook lk201_hook = {
	.init_channel	= lk201_init,
	.init_info	= lk201_info,
	.rx_char	= NULL,
	.poll_rx_char	= NULL,
	.poll_tx_char	= NULL,
	.cflags		= B4800 | CS8 | CSTOPB | CLOCAL,
};

/*
 * This is used during keyboard initialisation
 */
static unsigned char lk201_reset_string[] = {
	LK_CMD_SET_DEFAULTS,
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 1),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 2),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 3),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 4),
	LK_CMD_MODE(LK_MODE_DOWN_UP, 5),
	LK_CMD_MODE(LK_MODE_DOWN_UP, 6),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 7),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 8),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 9),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 10),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 11),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 12),
	LK_CMD_MODE(LK_MODE_DOWN, 13),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 14),
	LK_CMD_DIS_KEYCLK,
	LK_CMD_ENB_BELL, LK_PARAM_VOLUME(4),
};

static void *lk201_handle;

static int lk201_send(unsigned char ch)
{
	if (lk201_hook.poll_tx_char(lk201_handle, ch)) {
		printk(KERN_ERR "lk201: transmit timeout\n");
		return -EIO;
	}
	return 0;
}

static inline int lk201_get_id(void)
{
	return lk201_send(LK_CMD_REQ_ID);
}

static int lk201_reset(void)
{
	int i, r;

	for (i = 0; i < sizeof(lk201_reset_string); i++) {
		r = lk201_send(lk201_reset_string[i]);
		if (r < 0)
			return r;
	}
	return 0;
}

static void lk201_report(unsigned char id[6])
{
	char *report = "lk201: keyboard attached, ";

	switch (id[2]) {
	case LK_STAT_PWRUP_OK:
		printk(KERN_INFO "%sself-test OK\n", report);
		break;
	case LK_STAT_PWRUP_KDOWN:
		/* The keyboard will resend the power-up ID
		   after all keys are released, so we don't
		   bother handling the error specially.  Still
		   there may be a short-circuit inside.
		 */
		printk(KERN_ERR "%skey down (stuck?), code: 0x%02x\n",
		       report, id[3]);
		break;
	case LK_STAT_PWRUP_ERROR:
		printk(KERN_ERR "%sself-test failure\n", report);
		break;
	default:
		printk(KERN_ERR "%sunknown error: 0x%02x\n",
		       report, id[2]);
	}
}

static void lk201_id(unsigned char id[6])
{
	/*
	 * Report whether there is an LK201 or an LK401
	 * The LK401 has ALT keys...
	 */
	switch (id[4]) {
	case 1:
		printk(KERN_INFO "lk201: LK201 detected\n");
		break;
	case 2:
		printk(KERN_INFO "lk201: LK401 detected\n");
		break;
	case 3:
		printk(KERN_INFO "lk201: LK443 detected\n");
		break;
	case 4:
		printk(KERN_INFO "lk201: LK421 detected\n");
		break;
	default:
		printk(KERN_WARNING
		       "lk201: unknown keyboard detected, ID %d\n", id[4]);
		printk(KERN_WARNING "lk201: ... please report to "
		       "<linux-mips@linux-mips.org>\n");
	}
}

#define DEFAULT_KEYB_REP_DELAY	(250/5)	/* [5ms] */
#define DEFAULT_KEYB_REP_RATE	30	/* [cps] */

static struct kbd_repeat kbdrate = {
	DEFAULT_KEYB_REP_DELAY,
	DEFAULT_KEYB_REP_RATE
};

static void parse_kbd_rate(struct kbd_repeat *r)
{
	if (r->delay <= 0)
		r->delay = kbdrate.delay;
	if (r->rate <= 0)
		r->rate = kbdrate.rate;

	if (r->delay < 5)
		r->delay = 5;
	if (r->delay > 630)
		r->delay = 630;
	if (r->rate < 12)
		r->rate = 12;
	if (r->rate > 127)
		r->rate = 127;
	if (r->rate == 125)
		r->rate = 124;
}

static int write_kbd_rate(struct kbd_repeat *rep)
{
	int delay, rate;
	int i;

	delay = rep->delay / 5;
	rate = rep->rate;
	for (i = 0; i < 4; i++) {
		if (lk201_hook.poll_tx_char(lk201_handle,
					    LK_CMD_RPT_RATE(i)))
			return 1;
		if (lk201_hook.poll_tx_char(lk201_handle,
					    LK_PARAM_DELAY(delay)))
			return 1;
		if (lk201_hook.poll_tx_char(lk201_handle,
					    LK_PARAM_RATE(rate)))
			return 1;
	}
	return 0;
}

static int lk201_kbd_rate(struct kbd_repeat *rep)
{
	if (rep == NULL)
		return -EINVAL;

	parse_kbd_rate(rep);

	if (write_kbd_rate(rep)) {
		memcpy(rep, &kbdrate, sizeof(struct kbd_repeat));
		return -EIO;
	}

	memcpy(&kbdrate, rep, sizeof(struct kbd_repeat));

	return 0;
}

static void lk201_kd_mksound(unsigned int hz, unsigned int ticks)
{
	if (!ticks)
		return;

	/*
	 * Can't set frequency and we "approximate"
	 * duration by volume. ;-)
	 */
	ticks /= HZ / 32;
	if (ticks > 7)
		ticks = 7;
	ticks = 7 - ticks;

	if (lk201_hook.poll_tx_char(lk201_handle, LK_CMD_ENB_BELL))
		return;
	if (lk201_hook.poll_tx_char(lk201_handle, LK_PARAM_VOLUME(ticks)))
		return;
	if (lk201_hook.poll_tx_char(lk201_handle, LK_CMD_BELL))
		return;
}

void kbd_leds(unsigned char leds)
{
	unsigned char l = 0;

	if (!lk201_handle)		/* FIXME */
		return;

	/* FIXME -- Only Hold and Lock LEDs for now. --macro */
	if (leds & LED_SCR)
		l |= LK_LED_HOLD;
	if (leds & LED_CAP)
		l |= LK_LED_LOCK;

	if (lk201_hook.poll_tx_char(lk201_handle, LK_CMD_LEDS_ON))
		return;
	if (lk201_hook.poll_tx_char(lk201_handle, LK_PARAM_LED_MASK(l)))
		return;
	if (lk201_hook.poll_tx_char(lk201_handle, LK_CMD_LEDS_OFF))
		return;
	if (lk201_hook.poll_tx_char(lk201_handle, LK_PARAM_LED_MASK(~l)))
		return;
}

int kbd_setkeycode(unsigned int scancode, unsigned int keycode)
{
	return -EINVAL;
}

int kbd_getkeycode(unsigned int scancode)
{
	return -EINVAL;
}

int kbd_translate(unsigned char scancode, unsigned char *keycode,
		  char raw_mode)
{
	*keycode = scancode;
	return 1;
}

char kbd_unexpected_up(unsigned char keycode)
{
	return 0x80;
}

static void lk201_rx_char(unsigned char ch, unsigned char fl)
{
	static unsigned char id[6];
	static int id_i;

	static int shift_state = 0;
	static int prev_scancode;
	unsigned char c = scancodeRemap[ch];

	if (fl != TTY_NORMAL && fl != TTY_OVERRUN) {
		printk(KERN_ERR "lk201: keyboard receive error: 0x%02x\n", fl);
		return;
	}

	/* Assume this is a power-up ID. */
	if (ch == LK_STAT_PWRUP_ID && !id_i) {
		id[id_i++] = ch;
		return;
	}

	/* Handle the power-up sequence. */
	if (id_i) {
		id[id_i++] = ch;
		if (id_i == 4) {
			/* OK, the power-up concluded. */
			lk201_report(id);
			if (id[2] == LK_STAT_PWRUP_OK)
				lk201_get_id();
			else {
				id_i = 0;
				printk(KERN_ERR "lk201: keyboard power-up "
				       "error, skipping initialization\n");
			}
		} else if (id_i == 6) {
			/* We got the ID; report it and start operation. */
			id_i = 0;
			lk201_id(id);
			lk201_reset();
		}
		return;
	}

	/* Everything else is a scancode/status response. */
	id_i = 0;
	switch (ch) {
	case LK_STAT_RESUME_ERR:
	case LK_STAT_ERROR:
	case LK_STAT_INHIBIT_ACK:
	case LK_STAT_TEST_ACK:
	case LK_STAT_MODE_KEYDOWN:
	case LK_STAT_MODE_ACK:
		break;
	case LK_KEY_LOCK:
		shift_state ^= LK_LOCK;
		handle_scancode(c, (shift_state & LK_LOCK) ? 1 : 0);
		break;
	case LK_KEY_SHIFT:
		shift_state ^= LK_SHIFT;
		handle_scancode(c, (shift_state & LK_SHIFT) ? 1 : 0);
		break;
	case LK_KEY_CTRL:
		shift_state ^= LK_CTRL;
		handle_scancode(c, (shift_state & LK_CTRL) ? 1 : 0);
		break;
	case LK_KEY_COMP:
		shift_state ^= LK_COMP;
		handle_scancode(c, (shift_state & LK_COMP) ? 1 : 0);
		break;
	case LK_KEY_RELEASE:
		if (shift_state & LK_SHIFT)
			handle_scancode(scancodeRemap[LK_KEY_SHIFT], 0);
		if (shift_state & LK_CTRL)
			handle_scancode(scancodeRemap[LK_KEY_CTRL], 0);
		if (shift_state & LK_COMP)
			handle_scancode(scancodeRemap[LK_KEY_COMP], 0);
		if (shift_state & LK_LOCK)
			handle_scancode(scancodeRemap[LK_KEY_LOCK], 0);
		shift_state = 0;
		break;
	case LK_KEY_REPEAT:
		handle_scancode(prev_scancode, 1);
		break;
	default:
		prev_scancode = c;
		handle_scancode(c, 1);
		break;
	}
	tasklet_schedule(&keyboard_tasklet);
}

static void __init lk201_info(void *handle)
{
}

static int __init lk201_init(void *handle)
{
	/* First install handlers. */
	lk201_handle = handle;
	kbd_rate = lk201_kbd_rate;
	kd_mksound = lk201_kd_mksound;

	lk201_hook.rx_char = lk201_rx_char;

	/* Then just issue a reset -- the handlers will do the rest. */
	lk201_send(LK_CMD_POWER_UP);

	return 0;
}

void __init kbd_init_hw(void)
{
	/* Maxine uses LK501 at the Access.Bus. */
	if (!LK_IFACE)
		return;

	printk(KERN_INFO "lk201: DECstation LK keyboard driver v0.05.\n");

	if (LK_IFACE_ZS) {
		/*
		 * kbd_init_hw() is being called before
		 * rs_init() so just register the kbd hook
		 * and let zs_init do the rest :-)
		 */
		if (!register_dec_serial_hook(KEYB_LINE, &lk201_hook))
			unregister_dec_serial_hook(KEYB_LINE);
	} else {
		/*
		 * TODO: modify dz.c to allow similar hooks
		 * for LK201 handling on DS2100, DS3100, and DS5000/200
		 */
		printk(KERN_ERR "lk201: support for DZ11 not yet ready.\n");
	}
}