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Input: HIL - fix rwlock recursion bug
[linux/fpc-iii.git] / drivers / input / serio / hil_mlc.c
blob93a1a6ba216a8c13b08c2fca350509f9d2e56526
1 /*
2 * HIL MLC state machine and serio interface driver
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 * Driver theory of operation:
34 *
35 * Some access methods and an ISR is defined by the sub-driver
36 * (e.g. hp_sdc_mlc.c). These methods are expected to provide a
37 * few bits of logic in addition to raw access to the HIL MLC,
38 * specifically, the ISR, which is entirely registered by the
39 * sub-driver and invoked directly, must check for record
40 * termination or packet match, at which point a semaphore must
41 * be cleared and then the hil_mlcs_tasklet must be scheduled.
42 *
43 * The hil_mlcs_tasklet processes the state machine for all MLCs
44 * each time it runs, checking each MLC's progress at the current
45 * node in the state machine, and moving the MLC to subsequent nodes
46 * in the state machine when appropriate. It will reschedule
47 * itself if output is pending. (This rescheduling should be replaced
48 * at some point with a sub-driver-specific mechanism.)
49 *
50 * A timer task prods the tasklet once per second to prevent
51 * hangups when attached devices do not return expected data
52 * and to initiate probes of the loop for new devices.
53 */
54
55 #include <linux/hil_mlc.h>
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
58 #include <linux/module.h>
59 #include <linux/init.h>
60 #include <linux/interrupt.h>
61 #include <linux/timer.h>
62 #include <linux/list.h>
63
64 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
65 MODULE_DESCRIPTION("HIL MLC serio");
66 MODULE_LICENSE("Dual BSD/GPL");
67
68 EXPORT_SYMBOL(hil_mlc_register);
69 EXPORT_SYMBOL(hil_mlc_unregister);
70
71 #define PREFIX "HIL MLC: "
72
73 static LIST_HEAD(hil_mlcs);
74 static DEFINE_RWLOCK(hil_mlcs_lock);
75 static struct timer_list hil_mlcs_kicker;
76 static int hil_mlcs_probe;
77
78 static void hil_mlcs_process(unsigned long unused);
79 DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
80
81
82 /* #define HIL_MLC_DEBUG */
83
84 /********************** Device info/instance management **********************/
85
86 static void hil_mlc_clear_di_map(hil_mlc *mlc, int val)
87 {
88 int j;
89
90 for (j = val; j < 7 ; j++)
91 mlc->di_map[j] = -1;
92 }
93
94 static void hil_mlc_clear_di_scratch(hil_mlc *mlc)
95 {
96 memset(&mlc->di_scratch, 0, sizeof(mlc->di_scratch));
97 }
98
99 static void hil_mlc_copy_di_scratch(hil_mlc *mlc, int idx)
100 {
101 memcpy(&mlc->di[idx], &mlc->di_scratch, sizeof(mlc->di_scratch));
102 }
103
104 static int hil_mlc_match_di_scratch(hil_mlc *mlc)
105 {
106 int idx;
107
108 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
109 int j, found = 0;
110
111 /* In-use slots are not eligible. */
112 for (j = 0; j < 7 ; j++)
113 if (mlc->di_map[j] == idx)
114 found++;
115
116 if (found)
117 continue;
118
119 if (!memcmp(mlc->di + idx, &mlc->di_scratch,
120 sizeof(mlc->di_scratch)))
121 break;
122 }
123 return idx >= HIL_MLC_DEVMEM ? -1 : idx;
124 }
125
126 static int hil_mlc_find_free_di(hil_mlc *mlc)
127 {
128 int idx;
129
130 /* TODO: Pick all-zero slots first, failing that,
131 * randomize the slot picked among those eligible.
132 */
133 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
134 int j, found = 0;
135
136 for (j = 0; j < 7 ; j++)
137 if (mlc->di_map[j] == idx)
138 found++;
139
140 if (!found)
141 break;
142 }
143
144 return idx; /* Note: It is guaranteed at least one above will match */
145 }
146
147 static inline void hil_mlc_clean_serio_map(hil_mlc *mlc)
148 {
149 int idx;
150
151 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
152 int j, found = 0;
153
154 for (j = 0; j < 7 ; j++)
155 if (mlc->di_map[j] == idx)
156 found++;
157
158 if (!found)
159 mlc->serio_map[idx].di_revmap = -1;
160 }
161 }
162
163 static void hil_mlc_send_polls(hil_mlc *mlc)
164 {
165 int did, i, cnt;
166 struct serio *serio;
167 struct serio_driver *drv;
168
169 i = cnt = 0;
170 did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8;
171 serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL;
172 drv = (serio != NULL) ? serio->drv : NULL;
173
174 while (mlc->icount < 15 - i) {
175 hil_packet p;
176
177 p = mlc->ipacket[i];
178 if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
179 if (drv && drv->interrupt) {
180 drv->interrupt(serio, 0, 0);
181 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
182 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
183 drv->interrupt(serio, HIL_CMD_POL + cnt, 0);
184 }
185
186 did = (p & HIL_PKT_ADDR_MASK) >> 8;
187 serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL;
188 drv = (serio != NULL) ? serio->drv : NULL;
189 cnt = 0;
190 }
191
192 cnt++;
193 i++;
194
195 if (drv && drv->interrupt) {
196 drv->interrupt(serio, (p >> 24), 0);
197 drv->interrupt(serio, (p >> 16) & 0xff, 0);
198 drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0);
199 drv->interrupt(serio, p & 0xff, 0);
200 }
201 }
202 }
203
204 /*************************** State engine *********************************/
205
206 #define HILSEN_SCHED 0x000100 /* Schedule the tasklet */
207 #define HILSEN_BREAK 0x000200 /* Wait until next pass */
208 #define HILSEN_UP 0x000400 /* relative node#, decrement */
209 #define HILSEN_DOWN 0x000800 /* relative node#, increment */
210 #define HILSEN_FOLLOW 0x001000 /* use retval as next node# */
211
212 #define HILSEN_MASK 0x0000ff
213 #define HILSEN_START 0
214 #define HILSEN_RESTART 1
215 #define HILSEN_DHR 9
216 #define HILSEN_DHR2 10
217 #define HILSEN_IFC 14
218 #define HILSEN_HEAL0 16
219 #define HILSEN_HEAL 18
220 #define HILSEN_ACF 21
221 #define HILSEN_ACF2 22
222 #define HILSEN_DISC0 25
223 #define HILSEN_DISC 27
224 #define HILSEN_MATCH 40
225 #define HILSEN_OPERATE 41
226 #define HILSEN_PROBE 44
227 #define HILSEN_DSR 52
228 #define HILSEN_REPOLL 55
229 #define HILSEN_IFCACF 58
230 #define HILSEN_END 60
231
232 #define HILSEN_NEXT (HILSEN_DOWN | 1)
233 #define HILSEN_SAME (HILSEN_DOWN | 0)
234 #define HILSEN_LAST (HILSEN_UP | 1)
235
236 #define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK)
237 #define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK)
238
239 static int hilse_match(hil_mlc *mlc, int unused)
240 {
241 int rc;
242
243 rc = hil_mlc_match_di_scratch(mlc);
244 if (rc == -1) {
245 rc = hil_mlc_find_free_di(mlc);
246 if (rc == -1)
247 goto err;
248
249 #ifdef HIL_MLC_DEBUG
250 printk(KERN_DEBUG PREFIX "new in slot %i\n", rc);
251 #endif
252 hil_mlc_copy_di_scratch(mlc, rc);
253 mlc->di_map[mlc->ddi] = rc;
254 mlc->serio_map[rc].di_revmap = mlc->ddi;
255 hil_mlc_clean_serio_map(mlc);
256 serio_rescan(mlc->serio[rc]);
257 return -1;
258 }
259
260 mlc->di_map[mlc->ddi] = rc;
261 #ifdef HIL_MLC_DEBUG
262 printk(KERN_DEBUG PREFIX "same in slot %i\n", rc);
263 #endif
264 mlc->serio_map[rc].di_revmap = mlc->ddi;
265 hil_mlc_clean_serio_map(mlc);
266 return 0;
267
268 err:
269 printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n");
270 return 1;
271 }
272
273 /* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */
274 static int hilse_init_lcv(hil_mlc *mlc, int unused)
275 {
276 struct timeval tv;
277
278 do_gettimeofday(&tv);
279
280 if (mlc->lcv && (tv.tv_sec - mlc->lcv_tv.tv_sec) < 5)
281 return -1;
282
283 mlc->lcv_tv = tv;
284 mlc->lcv = 0;
285
286 return 0;
287 }
288
289 static int hilse_inc_lcv(hil_mlc *mlc, int lim)
290 {
291 return mlc->lcv++ >= lim ? -1 : 0;
292 }
293
294 #if 0
295 static int hilse_set_lcv(hil_mlc *mlc, int val)
296 {
297 mlc->lcv = val;
298
299 return 0;
300 }
301 #endif
302
303 /* Management of the discovered device index (zero based, -1 means no devs) */
304 static int hilse_set_ddi(hil_mlc *mlc, int val)
305 {
306 mlc->ddi = val;
307 hil_mlc_clear_di_map(mlc, val + 1);
308
309 return 0;
310 }
311
312 static int hilse_dec_ddi(hil_mlc *mlc, int unused)
313 {
314 mlc->ddi--;
315 if (mlc->ddi <= -1) {
316 mlc->ddi = -1;
317 hil_mlc_clear_di_map(mlc, 0);
318 return -1;
319 }
320 hil_mlc_clear_di_map(mlc, mlc->ddi + 1);
321
322 return 0;
323 }
324
325 static int hilse_inc_ddi(hil_mlc *mlc, int unused)
326 {
327 BUG_ON(mlc->ddi >= 6);
328 mlc->ddi++;
329
330 return 0;
331 }
332
333 static int hilse_take_idd(hil_mlc *mlc, int unused)
334 {
335 int i;
336
337 /* Help the state engine:
338 * Is this a real IDD response or just an echo?
339 *
340 * Real IDD response does not start with a command.
341 */
342 if (mlc->ipacket[0] & HIL_PKT_CMD)
343 goto bail;
344
345 /* Should have the command echoed further down. */
346 for (i = 1; i < 16; i++) {
347 if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) ==
348 (mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) &&
349 (mlc->ipacket[i] & HIL_PKT_CMD) &&
350 ((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD))
351 break;
352 }
353 if (i > 15)
354 goto bail;
355
356 /* And the rest of the packets should still be clear. */
357 while (++i < 16)
358 if (mlc->ipacket[i])
359 break;
360
361 if (i < 16)
362 goto bail;
363
364 for (i = 0; i < 16; i++)
365 mlc->di_scratch.idd[i] =
366 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
367
368 /* Next step is to see if RSC supported */
369 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC)
370 return HILSEN_NEXT;
371
372 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
373 return HILSEN_DOWN | 4;
374
375 return 0;
376
377 bail:
378 mlc->ddi--;
379
380 return -1; /* This should send us off to ACF */
381 }
382
383 static int hilse_take_rsc(hil_mlc *mlc, int unused)
384 {
385 int i;
386
387 for (i = 0; i < 16; i++)
388 mlc->di_scratch.rsc[i] =
389 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
390
391 /* Next step is to see if EXD supported (IDD has already been read) */
392 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
393 return HILSEN_NEXT;
394
395 return 0;
396 }
397
398 static int hilse_take_exd(hil_mlc *mlc, int unused)
399 {
400 int i;
401
402 for (i = 0; i < 16; i++)
403 mlc->di_scratch.exd[i] =
404 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
405
406 /* Next step is to see if RNM supported. */
407 if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM)
408 return HILSEN_NEXT;
409
410 return 0;
411 }
412
413 static int hilse_take_rnm(hil_mlc *mlc, int unused)
414 {
415 int i;
416
417 for (i = 0; i < 16; i++)
418 mlc->di_scratch.rnm[i] =
419 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
420
421 printk(KERN_INFO PREFIX "Device name gotten: %16s\n",
422 mlc->di_scratch.rnm);
423
424 return 0;
425 }
426
427 static int hilse_operate(hil_mlc *mlc, int repoll)
428 {
429
430 if (mlc->opercnt == 0)
431 hil_mlcs_probe = 0;
432 mlc->opercnt = 1;
433
434 hil_mlc_send_polls(mlc);
435
436 if (!hil_mlcs_probe)
437 return 0;
438 hil_mlcs_probe = 0;
439 mlc->opercnt = 0;
440 return 1;
441 }
442
443 #define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \
444 { HILSE_FUNC, { .func = funct }, funct_arg, zero_rc, neg_rc, pos_rc },
445 #define OUT(pack) \
446 { HILSE_OUT, { .packet = pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 },
447 #define CTS \
448 { HILSE_CTS, { .packet = 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 },
449 #define EXPECT(comp, to, got, got_wrong, timed_out) \
450 { HILSE_EXPECT, { .packet = comp }, to, got, got_wrong, timed_out },
451 #define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \
452 { HILSE_EXPECT_LAST, { .packet = comp }, to, got, got_wrong, timed_out },
453 #define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \
454 { HILSE_EXPECT_DISC, { .packet = comp }, to, got, got_wrong, timed_out },
455 #define IN(to, got, got_error, timed_out) \
456 { HILSE_IN, { .packet = 0 }, to, got, got_error, timed_out },
457 #define OUT_DISC(pack) \
458 { HILSE_OUT_DISC, { .packet = pack }, 0, 0, 0, 0 },
459 #define OUT_LAST(pack) \
460 { HILSE_OUT_LAST, { .packet = pack }, 0, 0, 0, 0 },
461
462 const struct hilse_node hil_mlc_se[HILSEN_END] = {
463
464 /* 0 HILSEN_START */
465 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
466
467 /* 1 HILSEN_RESTART */
468 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
469 OUT(HIL_CTRL_ONLY) /* Disable APE */
470 CTS
471
472 #define TEST_PACKET(x) \
473 (HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x)
474
475 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5))
476 EXPECT(HIL_ERR_INT | TEST_PACKET(0x5),
477 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
478 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa))
479 EXPECT(HIL_ERR_INT | TEST_PACKET(0xa),
480 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
481 OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */
482
483 /* 9 HILSEN_DHR */
484 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
485
486 /* 10 HILSEN_DHR2 */
487 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
488 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
489 OUT(HIL_PKT_CMD | HIL_CMD_DHR)
490 IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT)
491
492 /* 14 HILSEN_IFC */
493 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
494 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
495 20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT )
496
497 /* If devices are there, they weren't in PUP or other loopback mode.
498 * We're more concerned at this point with restoring operation
499 * to devices than discovering new ones, so we try to salvage
500 * the loop configuration by closing off the loop.
501 */
502
503 /* 16 HILSEN_HEAL0 */
504 FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0)
505 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0)
506
507 /* 18 HILSEN_HEAL */
508 OUT_LAST(HIL_CMD_ELB)
509 EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT,
510 20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT)
511 FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0)
512
513 /* 21 HILSEN_ACF */
514 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0)
515
516 /* 22 HILSEN_ACF2 */
517 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
518 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
519 IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
520
521 /* 25 HILSEN_DISC0 */
522 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
523 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT,
524 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
525
526 /* Only enter here if response just received */
527 /* 27 HILSEN_DISC */
528 OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD)
529 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT,
530 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START)
531 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0)
532 FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW)
533 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC)
534 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT,
535 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
536 FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
537 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD)
538 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT,
539 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
540 FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
541 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM)
542 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT,
543 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
544 FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0)
545
546 /* 40 HILSEN_MATCH */
547 FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0)
548
549 /* 41 HILSEN_OPERATE */
550 OUT(HIL_PKT_CMD | HIL_CMD_POL)
551 EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT,
552 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
553 FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT)
554
555 /* 44 HILSEN_PROBE */
556 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT)
557 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
558 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
559 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
560 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
561 IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT)
562 OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB)
563 IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR)
564
565 /* 52 HILSEN_DSR */
566 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
567 OUT(HIL_PKT_CMD | HIL_CMD_DSR)
568 IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC)
569
570 /* 55 HILSEN_REPOLL */
571 OUT(HIL_PKT_CMD | HIL_CMD_RPL)
572 EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT,
573 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
574 FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE)
575
576 /* 58 HILSEN_IFCACF */
577 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
578 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
579 20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL)
580
581 /* 60 HILSEN_END */
582 };
583
584 static inline void hilse_setup_input(hil_mlc *mlc, const struct hilse_node *node)
585 {
586
587 switch (node->act) {
588 case HILSE_EXPECT_DISC:
589 mlc->imatch = node->object.packet;
590 mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
591 break;
592 case HILSE_EXPECT_LAST:
593 mlc->imatch = node->object.packet;
594 mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
595 break;
596 case HILSE_EXPECT:
597 mlc->imatch = node->object.packet;
598 break;
599 case HILSE_IN:
600 mlc->imatch = 0;
601 break;
602 default:
603 BUG();
604 }
605 mlc->istarted = 1;
606 mlc->intimeout = node->arg;
607 do_gettimeofday(&(mlc->instart));
608 mlc->icount = 15;
609 memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
610 BUG_ON(down_trylock(&mlc->isem));
611 }
612
613 #ifdef HIL_MLC_DEBUG
614 static int doze;
615 static int seidx; /* For debug */
616 #endif
617
618 static int hilse_donode(hil_mlc *mlc)
619 {
620 const struct hilse_node *node;
621 int nextidx = 0;
622 int sched_long = 0;
623 unsigned long flags;
624
625 #ifdef HIL_MLC_DEBUG
626 if (mlc->seidx && mlc->seidx != seidx &&
627 mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) {
628 printk(KERN_DEBUG PREFIX "z%i \n {%i}", doze, mlc->seidx);
629 doze = 0;
630 }
631
632 seidx = mlc->seidx;
633 #endif
634 node = hil_mlc_se + mlc->seidx;
635
636 switch (node->act) {
637 int rc;
638 hil_packet pack;
639
640 case HILSE_FUNC:
641 BUG_ON(node->object.func == NULL);
642 rc = node->object.func(mlc, node->arg);
643 nextidx = (rc > 0) ? node->ugly :
644 ((rc < 0) ? node->bad : node->good);
645 if (nextidx == HILSEN_FOLLOW)
646 nextidx = rc;
647 break;
648
649 case HILSE_EXPECT_LAST:
650 case HILSE_EXPECT_DISC:
651 case HILSE_EXPECT:
652 case HILSE_IN:
653 /* Already set up from previous HILSE_OUT_* */
654 write_lock_irqsave(&mlc->lock, flags);
655 rc = mlc->in(mlc, node->arg);
656 if (rc == 2) {
657 nextidx = HILSEN_DOZE;
658 sched_long = 1;
659 write_unlock_irqrestore(&mlc->lock, flags);
660 break;
661 }
662 if (rc == 1)
663 nextidx = node->ugly;
664 else if (rc == 0)
665 nextidx = node->good;
666 else
667 nextidx = node->bad;
668 mlc->istarted = 0;
669 write_unlock_irqrestore(&mlc->lock, flags);
670 break;
671
672 case HILSE_OUT_LAST:
673 write_lock_irqsave(&mlc->lock, flags);
674 pack = node->object.packet;
675 pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
676 goto out;
677
678 case HILSE_OUT_DISC:
679 write_lock_irqsave(&mlc->lock, flags);
680 pack = node->object.packet;
681 pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
682 goto out;
683
684 case HILSE_OUT:
685 write_lock_irqsave(&mlc->lock, flags);
686 pack = node->object.packet;
687 out:
688 if (mlc->istarted)
689 goto out2;
690 /* Prepare to receive input */
691 if ((node + 1)->act & HILSE_IN)
692 hilse_setup_input(mlc, node + 1);
693
694 out2:
695 write_unlock_irqrestore(&mlc->lock, flags);
696
697 if (down_trylock(&mlc->osem)) {
698 nextidx = HILSEN_DOZE;
699 break;
700 }
701 up(&mlc->osem);
702
703 write_lock_irqsave(&mlc->lock, flags);
704 if (!mlc->ostarted) {
705 mlc->ostarted = 1;
706 mlc->opacket = pack;
707 mlc->out(mlc);
708 nextidx = HILSEN_DOZE;
709 write_unlock_irqrestore(&mlc->lock, flags);
710 break;
711 }
712 mlc->ostarted = 0;
713 do_gettimeofday(&(mlc->instart));
714 write_unlock_irqrestore(&mlc->lock, flags);
715 nextidx = HILSEN_NEXT;
716 break;
717
718 case HILSE_CTS:
719 write_lock_irqsave(&mlc->lock, flags);
720 nextidx = mlc->cts(mlc) ? node->bad : node->good;
721 write_unlock_irqrestore(&mlc->lock, flags);
722 break;
723
724 default:
725 BUG();
726 }
727
728 #ifdef HIL_MLC_DEBUG
729 if (nextidx == HILSEN_DOZE)
730 doze++;
731 #endif
732
733 while (nextidx & HILSEN_SCHED) {
734 struct timeval tv;
735
736 if (!sched_long)
737 goto sched;
738
739 do_gettimeofday(&tv);
740 tv.tv_usec += USEC_PER_SEC * (tv.tv_sec - mlc->instart.tv_sec);
741 tv.tv_usec -= mlc->instart.tv_usec;
742 if (tv.tv_usec >= mlc->intimeout) goto sched;
743 tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / USEC_PER_SEC;
744 if (!tv.tv_usec) goto sched;
745 mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec);
746 break;
747 sched:
748 tasklet_schedule(&hil_mlcs_tasklet);
749 break;
750 }
751
752 if (nextidx & HILSEN_DOWN)
753 mlc->seidx += nextidx & HILSEN_MASK;
754 else if (nextidx & HILSEN_UP)
755 mlc->seidx -= nextidx & HILSEN_MASK;
756 else
757 mlc->seidx = nextidx & HILSEN_MASK;
758
759 if (nextidx & HILSEN_BREAK)
760 return 1;
761
762 return 0;
763 }
764
765 /******************** tasklet context functions **************************/
766 static void hil_mlcs_process(unsigned long unused)
767 {
768 struct list_head *tmp;
769
770 read_lock(&hil_mlcs_lock);
771 list_for_each(tmp, &hil_mlcs) {
772 struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list);
773 while (hilse_donode(mlc) == 0) {
774 #ifdef HIL_MLC_DEBUG
775 if (mlc->seidx != 41 &&
776 mlc->seidx != 42 &&
777 mlc->seidx != 43)
778 printk(KERN_DEBUG PREFIX " + ");
779 #endif
780 }
781 }
782 read_unlock(&hil_mlcs_lock);
783 }
784
785 /************************* Keepalive timer task *********************/
786
787 void hil_mlcs_timer(unsigned long data)
788 {
789 hil_mlcs_probe = 1;
790 tasklet_schedule(&hil_mlcs_tasklet);
791 /* Re-insert the periodic task. */
792 if (!timer_pending(&hil_mlcs_kicker))
793 mod_timer(&hil_mlcs_kicker, jiffies + HZ);
794 }
795
796 /******************** user/kernel context functions **********************/
797
798 static int hil_mlc_serio_write(struct serio *serio, unsigned char c)
799 {
800 struct hil_mlc_serio_map *map;
801 struct hil_mlc *mlc;
802 struct serio_driver *drv;
803 uint8_t *idx, *last;
804
805 map = serio->port_data;
806 BUG_ON(map == NULL);
807
808 mlc = map->mlc;
809 BUG_ON(mlc == NULL);
810
811 mlc->serio_opacket[map->didx] |=
812 ((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));
813
814 if (mlc->serio_oidx[map->didx] >= 3) {
815 /* for now only commands */
816 if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
817 return -EIO;
818 switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
819 case HIL_CMD_IDD:
820 idx = mlc->di[map->didx].idd;
821 goto emu;
822 case HIL_CMD_RSC:
823 idx = mlc->di[map->didx].rsc;
824 goto emu;
825 case HIL_CMD_EXD:
826 idx = mlc->di[map->didx].exd;
827 goto emu;
828 case HIL_CMD_RNM:
829 idx = mlc->di[map->didx].rnm;
830 goto emu;
831 default:
832 break;
833 }
834 mlc->serio_oidx[map->didx] = 0;
835 mlc->serio_opacket[map->didx] = 0;
836 }
837
838 mlc->serio_oidx[map->didx]++;
839 return -EIO;
840 emu:
841 drv = serio->drv;
842 BUG_ON(drv == NULL);
843
844 last = idx + 15;
845 while ((last != idx) && (*last == 0))
846 last--;
847
848 while (idx != last) {
849 drv->interrupt(serio, 0, 0);
850 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
851 drv->interrupt(serio, 0, 0);
852 drv->interrupt(serio, *idx, 0);
853 idx++;
854 }
855 drv->interrupt(serio, 0, 0);
856 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
857 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
858 drv->interrupt(serio, *idx, 0);
859
860 mlc->serio_oidx[map->didx] = 0;
861 mlc->serio_opacket[map->didx] = 0;
862
863 return 0;
864 }
865
866 static int hil_mlc_serio_open(struct serio *serio)
867 {
868 struct hil_mlc_serio_map *map;
869 struct hil_mlc *mlc;
870
871 if (serio_get_drvdata(serio) != NULL)
872 return -EBUSY;
873
874 map = serio->port_data;
875 BUG_ON(map == NULL);
876
877 mlc = map->mlc;
878 BUG_ON(mlc == NULL);
879
880 return 0;
881 }
882
883 static void hil_mlc_serio_close(struct serio *serio)
884 {
885 struct hil_mlc_serio_map *map;
886 struct hil_mlc *mlc;
887
888 map = serio->port_data;
889 BUG_ON(map == NULL);
890
891 mlc = map->mlc;
892 BUG_ON(mlc == NULL);
893
894 serio_set_drvdata(serio, NULL);
895 serio->drv = NULL;
896 /* TODO wake up interruptable */
897 }
898
899 static const struct serio_device_id hil_mlc_serio_id = {
900 .type = SERIO_HIL_MLC,
901 .proto = SERIO_HIL,
902 .extra = SERIO_ANY,
903 .id = SERIO_ANY,
904 };
905
906 int hil_mlc_register(hil_mlc *mlc)
907 {
908 int i;
909 unsigned long flags;
910
911 BUG_ON(mlc == NULL);
912
913 mlc->istarted = 0;
914 mlc->ostarted = 0;
915
916 rwlock_init(&mlc->lock);
917 init_MUTEX(&mlc->osem);
918
919 init_MUTEX(&mlc->isem);
920 mlc->icount = -1;
921 mlc->imatch = 0;
922
923 mlc->opercnt = 0;
924
925 init_MUTEX_LOCKED(&(mlc->csem));
926
927 hil_mlc_clear_di_scratch(mlc);
928 hil_mlc_clear_di_map(mlc, 0);
929 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
930 struct serio *mlc_serio;
931 hil_mlc_copy_di_scratch(mlc, i);
932 mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
933 mlc->serio[i] = mlc_serio;
934 snprintf(mlc_serio->name, sizeof(mlc_serio->name)-1, "HIL_SERIO%d", i);
935 snprintf(mlc_serio->phys, sizeof(mlc_serio->phys)-1, "HIL%d", i);
936 mlc_serio->id = hil_mlc_serio_id;
937 mlc_serio->write = hil_mlc_serio_write;
938 mlc_serio->open = hil_mlc_serio_open;
939 mlc_serio->close = hil_mlc_serio_close;
940 mlc_serio->port_data = &(mlc->serio_map[i]);
941 mlc->serio_map[i].mlc = mlc;
942 mlc->serio_map[i].didx = i;
943 mlc->serio_map[i].di_revmap = -1;
944 mlc->serio_opacket[i] = 0;
945 mlc->serio_oidx[i] = 0;
946 serio_register_port(mlc_serio);
947 }
948
949 mlc->tasklet = &hil_mlcs_tasklet;
950
951 write_lock_irqsave(&hil_mlcs_lock, flags);
952 list_add_tail(&mlc->list, &hil_mlcs);
953 mlc->seidx = HILSEN_START;
954 write_unlock_irqrestore(&hil_mlcs_lock, flags);
955
956 tasklet_schedule(&hil_mlcs_tasklet);
957 return 0;
958 }
959
960 int hil_mlc_unregister(hil_mlc *mlc)
961 {
962 struct list_head *tmp;
963 unsigned long flags;
964 int i;
965
966 BUG_ON(mlc == NULL);
967
968 write_lock_irqsave(&hil_mlcs_lock, flags);
969 list_for_each(tmp, &hil_mlcs)
970 if (list_entry(tmp, hil_mlc, list) == mlc)
971 goto found;
972
973 /* not found in list */
974 write_unlock_irqrestore(&hil_mlcs_lock, flags);
975 tasklet_schedule(&hil_mlcs_tasklet);
976 return -ENODEV;
977
978 found:
979 list_del(tmp);
980 write_unlock_irqrestore(&hil_mlcs_lock, flags);
981
982 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
983 serio_unregister_port(mlc->serio[i]);
984 mlc->serio[i] = NULL;
985 }
986
987 tasklet_schedule(&hil_mlcs_tasklet);
988 return 0;
989 }
990
991 /**************************** Module interface *************************/
992
993 static int __init hil_mlc_init(void)
994 {
995 init_timer(&hil_mlcs_kicker);
996 hil_mlcs_kicker.expires = jiffies + HZ;
997 hil_mlcs_kicker.function = &hil_mlcs_timer;
998 add_timer(&hil_mlcs_kicker);
999
1000 tasklet_enable(&hil_mlcs_tasklet);
1001
1002 return 0;
1003 }
1004
1005 static void __exit hil_mlc_exit(void)
1006 {
1007 del_timer(&hil_mlcs_kicker);
1008
1009 tasklet_disable(&hil_mlcs_tasklet);
1010 tasklet_kill(&hil_mlcs_tasklet);
1011 }
1012
1013 module_init(hil_mlc_init);
1014 module_exit(hil_mlc_exit);
Linux with added FPC-III support