1 /*
2 * linux/drivers/char/ec3104_keyb.c
3 *
4 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
5 *
6 * based on linux/drivers/char/pc_keyb.c, which had the following comments:
7 *
8 * Separation of the PC low-level part by Geert Uytterhoeven, May 1997
9 * See keyboard.c for the whole history.
10 *
11 * Major cleanup by Martin Mares, May 1997
12 *
13 * Combined the keyboard and PS/2 mouse handling into one file,
14 * because they share the same hardware.
15 * Johan Myreen <jem@iki.fi> 1998-10-08.
16 *
17 * Code fixes to handle mouse ACKs properly.
18 * C. Scott Ananian <cananian@alumni.princeton.edu> 1999-01-29.
19 */
20 /* EC3104 note:
21 * This code was written without any documentation about the EC3104 chip. While
22 * I hope I got most of the basic functionality right, the register names I use
23 * are most likely completely different from those in the chip documentation.
24 *
25 * If you have any further information about the EC3104, please tell me
26 * (prumpf@tux.org).
27 */
28
29 #include <linux/config.h>
30
31 #include <linux/spinlock.h>
32 #include <linux/sched.h>
33 #include <linux/interrupt.h>
34 #include <linux/tty.h>
35 #include <linux/mm.h>
36 #include <linux/signal.h>
37 #include <linux/init.h>
38 #include <linux/kbd_ll.h>
39 #include <linux/delay.h>
40 #include <linux/random.h>
41 #include <linux/poll.h>
42 #include <linux/miscdevice.h>
43 #include <linux/slab.h>
44 #include <linux/kbd_kern.h>
45 #include <linux/smp_lock.h>
46 #include <linux/bitops.h>
47
48 #include <asm/keyboard.h>
49 #include <asm/uaccess.h>
50 #include <asm/irq.h>
51 #include <asm/system.h>
52 #include <asm/ec3104.h>
53
54 #include <asm/io.h>
55
56 /* Some configuration switches are present in the include file... */
57
58 #include <linux/pc_keyb.h>
59
60 #define MSR_CTS 0x10
61 #define MCR_RTS 0x02
62 #define LSR_DR 0x01
63 #define LSR_BOTH_EMPTY 0x60
64
65 static struct e5_struct {
66 u8 packet[8];
67 int pos;
68 int length;
69
70 u8 cached_mcr;
71 u8 last_msr;
72 } ec3104_keyb;
73
74 /* Simple translation table for the SysRq keys */
75
76
77 #ifdef CONFIG_MAGIC_SYSRQ
78 unsigned char ec3104_kbd_sysrq_xlate[128] =
79 "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
80 "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
81 "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
82 "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
83 "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
84 "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
85 "\r\000/"; /* 0x60 - 0x6f */
86 #endif
87
88 static void kbd_write_command_w(int data);
89 static void kbd_write_output_w(int data);
90 #ifdef CONFIG_PSMOUSE
91 static void aux_write_ack(int val);
92 static void __aux_write_ack(int val);
93 #endif
94
95 static DEFINE_SPINLOCK(kbd_controller_lock);
96 static unsigned char handle_kbd_event(void);
97
98 /* used only by send_data - set by keyboard_interrupt */
99 static volatile unsigned char reply_expected;
100 static volatile unsigned char acknowledge;
101 static volatile unsigned char resend;
102
103
104 int ec3104_kbd_setkeycode(unsigned int scancode, unsigned int keycode)
105 {
106 return 0;
107 }
108
109 int ec3104_kbd_getkeycode(unsigned int scancode)
110 {
111 return 0;
112 }
113
114
115 /* yes, it probably would be faster to use an array. I don't care. */
116
117 static inline unsigned char ec3104_scan2key(unsigned char scancode)
118 {
119 switch (scancode) {
120 case 1: /* '`' */
121 return 41;
122
123 case 2 ... 27:
124 return scancode;
125
126 case 28: /* '\\' */
127 return 43;
128
129 case 29 ... 39:
130 return scancode + 1;
131
132 case 40: /* '\r' */
133 return 28;
134
135 case 41 ... 50:
136 return scancode + 3;
137
138 case 51: /* ' ' */
139 return 57;
140
141 case 52: /* escape */
142 return 1;
143
144 case 54: /* insert/delete (labelled delete) */
145 /* this should arguably be 110, but I'd like to have ctrl-alt-del
146 * working with a standard keymap */
147 return 111;
148
149 case 55: /* left */
150 return 105;
151 case 56: /* home */
152 return 102;
153 case 57: /* end */
154 return 107;
155 case 58: /* up */
156 return 103;
157 case 59: /* down */
158 return 108;
159 case 60: /* pgup */
160 return 104;
161 case 61: /* pgdown */
162 return 109;
163 case 62: /* right */
164 return 106;
165
166 case 79 ... 88: /* f1 - f10 */
167 return scancode - 20;
168
169 case 89 ... 90: /* f11 - f12 */
170 return scancode - 2;
171
172 case 91: /* left shift */
173 return 42;
174
175 case 92: /* right shift */
176 return 54;
177
178 case 93: /* left alt */
179 return 56;
180 case 94: /* right alt */
181 return 100;
182 case 95: /* left ctrl */
183 return 29;
184 case 96: /* right ctrl */
185 return 97;
186
187 case 97: /* caps lock */
188 return 58;
189 case 102: /* left windows */
190 return 125;
191 case 103: /* right windows */
192 return 126;
193
194 case 106: /* Fn */
195 /* this is wrong. */
196 return 84;
197
198 default:
199 return 0;
200 }
201 }
202
203 int ec3104_kbd_translate(unsigned char scancode, unsigned char *keycode,
204 char raw_mode)
205 {
206 scancode &= 0x7f;
207
208 *keycode = ec3104_scan2key(scancode);
209
210 return 1;
211 }
212
213 char ec3104_kbd_unexpected_up(unsigned char keycode)
214 {
215 return 0200;
216 }
217
218 static inline void handle_keyboard_event(unsigned char scancode)
219 {
220 #ifdef CONFIG_VT
221 handle_scancode(scancode, !(scancode & 0x80));
222 #endif
223 tasklet_schedule(&keyboard_tasklet);
224 }
225
226 void ec3104_kbd_leds(unsigned char leds)
227 {
228 }
229
230 static u8 e5_checksum(u8 *packet, int count)
231 {
232 int i;
233 u8 sum = 0;
234
235 for (i=0; i<count; i++)
236 sum ^= packet[i];
237
238 if (sum & 0x80)
239 sum ^= 0xc0;
240
241 return sum;
242 }
243
244 static void e5_wait_for_cts(struct e5_struct *k)
245 {
246 u8 msr;
247
248 do {
249 msr = ctrl_inb(EC3104_SER4_MSR);
250 } while (!(msr & MSR_CTS));
251 }
252
253
254 static void e5_send_byte(u8 byte, struct e5_struct *k)
255 {
256 u8 status;
257
258 do {
259 status = ctrl_inb(EC3104_SER4_LSR);
260 } while ((status & LSR_BOTH_EMPTY) != LSR_BOTH_EMPTY);
261
262 printk("<%02x>", byte);
263
264 ctrl_outb(byte, EC3104_SER4_DATA);
265
266 do {
267 status = ctrl_inb(EC3104_SER4_LSR);
268 } while ((status & LSR_BOTH_EMPTY) != LSR_BOTH_EMPTY);
269
270 }
271
272 static int e5_send_packet(u8 *packet, int count, struct e5_struct *k)
273 {
274 int i;
275
276 disable_irq(EC3104_IRQ_SER4);
277
278 if (k->cached_mcr & MCR_RTS) {
279 printk("e5_send_packet: too slow\n");
280 enable_irq(EC3104_IRQ_SER4);
281 return -EAGAIN;
282 }
283
284 k->cached_mcr |= MCR_RTS;
285 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
286
287 e5_wait_for_cts(k);
288
289 printk("p: ");
290
291 for(i=0; i<count; i++)
292 e5_send_byte(packet[i], k);
293
294 e5_send_byte(e5_checksum(packet, count), k);
295
296 printk("\n");
297
298 udelay(1500);
299
300 k->cached_mcr &= ~MCR_RTS;
301 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
302
303 set_current_state(TASK_UNINTERRUPTIBLE);
304
305
306
307 enable_irq(EC3104_IRQ_SER4);
308
309
310
311 return 0;
312 }
313
314 /*
315 * E5 packets we know about:
316 * E5->host 0x80 0x05 <checksum> - resend packet
317 * host->E5 0x83 0x43 <contrast> - set LCD contrast
318 * host->E5 0x85 0x41 0x02 <brightness> 0x02 - set LCD backlight
319 * E5->host 0x87 <ps2 packet> 0x00 <checksum> - external PS2
320 * E5->host 0x88 <scancode> <checksum> - key press
321 */
322
323 static void e5_receive(struct e5_struct *k)
324 {
325 k->packet[k->pos++] = ctrl_inb(EC3104_SER4_DATA);
326
327 if (k->pos == 1) {
328 switch(k->packet[0]) {
329 case 0x80:
330 k->length = 3;
331 break;
332
333 case 0x87: /* PS2 ext */
334 k->length = 6;
335 break;
336
337 case 0x88: /* keyboard */
338 k->length = 3;
339 break;
340
341 default:
342 k->length = 1;
343 printk(KERN_WARNING "unknown E5 packet %02x\n",
344 k->packet[0]);
345 }
346 }
347
348 if (k->pos == k->length) {
349 int i;
350
351 if (e5_checksum(k->packet, k->length) != 0)
352 printk(KERN_WARNING "E5: wrong checksum\n");
353
354 #if 0
355 printk("E5 packet [");
356 for(i=0; i<k->length; i++) {
357 printk("%02x ", k->packet[i]);
358 }
359
360 printk("(%02x)]\n", e5_checksum(k->packet, k->length-1));
361 #endif
362
363 switch(k->packet[0]) {
364 case 0x80:
365 case 0x88:
366 handle_keyboard_event(k->packet[1]);
367 break;
368 }
369
370 k->pos = k->length = 0;
371 }
372 }
373
374 static void ec3104_keyb_interrupt(int irq, void *data, struct pt_regs *regs)
375 {
376 struct e5_struct *k = &ec3104_keyb;
377 u8 msr, lsr;
378
379 msr = ctrl_inb(EC3104_SER4_MSR);
380
381 if ((msr & MSR_CTS) && !(k->last_msr & MSR_CTS)) {
382 if (k->cached_mcr & MCR_RTS)
383 printk("confused: RTS already high\n");
384 /* CTS went high. Send RTS. */
385 k->cached_mcr |= MCR_RTS;
386
387 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
388 } else if ((!(msr & MSR_CTS)) && (k->last_msr & MSR_CTS)) {
389 /* CTS went low. */
390 if (!(k->cached_mcr & MCR_RTS))
391 printk("confused: RTS already low\n");
392
393 k->cached_mcr &= ~MCR_RTS;
394
395 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
396 }
397
398 k->last_msr = msr;
399
400 lsr = ctrl_inb(EC3104_SER4_LSR);
401
402 if (lsr & LSR_DR)
403 e5_receive(k);
404 }
405
406 static void ec3104_keyb_clear_state(void)
407 {
408 struct e5_struct *k = &ec3104_keyb;
409 u8 msr, lsr;
410
411 /* we want CTS to be low */
412 k->last_msr = 0;
413
414 for (;;) {
415 msleep(100);
416
417 msr = ctrl_inb(EC3104_SER4_MSR);
418
419 lsr = ctrl_inb(EC3104_SER4_LSR);
420
421 if (lsr & LSR_DR) {
422 e5_receive(k);
423 continue;
424 }
425
426 if ((msr & MSR_CTS) && !(k->last_msr & MSR_CTS)) {
427 if (k->cached_mcr & MCR_RTS)
428 printk("confused: RTS already high\n");
429 /* CTS went high. Send RTS. */
430 k->cached_mcr |= MCR_RTS;
431
432 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
433 } else if ((!(msr & MSR_CTS)) && (k->last_msr & MSR_CTS)) {
434 /* CTS went low. */
435 if (!(k->cached_mcr & MCR_RTS))
436 printk("confused: RTS already low\n");
437
438 k->cached_mcr &= ~MCR_RTS;
439
440 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
441 } else
442 break;
443
444 k->last_msr = msr;
445
446 continue;
447 }
448 }
449
450 void __init ec3104_kbd_init_hw(void)
451 {
452 ec3104_keyb.last_msr = ctrl_inb(EC3104_SER4_MSR);
453 ec3104_keyb.cached_mcr = ctrl_inb(EC3104_SER4_MCR);
454
455 ec3104_keyb_clear_state();
456
457 /* Ok, finally allocate the IRQ, and off we go.. */
458 request_irq(EC3104_IRQ_SER4, ec3104_keyb_interrupt, 0, "keyboard", NULL);
459 }
460
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