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Input: ads7846 - add support for the ads7843 touchscreen
[linux-2.6-block.git] / drivers / input / serio / hil_mlc.c
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1da177e4
LT		 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>
1da177e4
LT		 62#include <linux/list.h>
63
64MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
65MODULE_DESCRIPTION("HIL MLC serio");
66MODULE_LICENSE("Dual BSD/GPL");
67
68EXPORT_SYMBOL(hil_mlc_register);
69EXPORT_SYMBOL(hil_mlc_unregister);
70
71#define PREFIX "HIL MLC: "
72
73static LIST_HEAD(hil_mlcs);
74static DEFINE_RWLOCK(hil_mlcs_lock);
75static struct timer_list hil_mlcs_kicker;
76static int hil_mlcs_probe;
77
78static void hil_mlcs_process(unsigned long unused);
79DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
80
81
82/* #define HIL_MLC_DEBUG */
83
84/********************** Device info/instance management **********************/
85
86static void hil_mlc_clear_di_map (hil_mlc *mlc, int val) {
87 int j;
88 for (j = val; j < 7 ; j++) {
89 mlc->di_map[j] = -1;
90 }
91}
92
93static void hil_mlc_clear_di_scratch (hil_mlc *mlc) {
94 memset(&(mlc->di_scratch), 0, sizeof(mlc->di_scratch));
95}
96
97static void hil_mlc_copy_di_scratch (hil_mlc *mlc, int idx) {
98 memcpy(&(mlc->di[idx]), &(mlc->di_scratch), sizeof(mlc->di_scratch));
99}
100
101static int hil_mlc_match_di_scratch (hil_mlc *mlc) {
102 int idx;
103
104 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
105 int j, found;
106
107 /* In-use slots are not eligible. */
108 found = 0;
109 for (j = 0; j < 7 ; j++) {
110 if (mlc->di_map[j] == idx) found++;
111 }
112 if (found) continue;
113 if (!memcmp(mlc->di + idx,
114 &(mlc->di_scratch),
115 sizeof(mlc->di_scratch))) break;
116 }
117 return((idx >= HIL_MLC_DEVMEM) ? -1 : idx);
118}
119
120static int hil_mlc_find_free_di(hil_mlc *mlc) {
121 int idx;
122 /* TODO: Pick all-zero slots first, failing that,
123 * randomize the slot picked among those eligible.
124 */
125 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
126 int j, found;
127 found = 0;
128 for (j = 0; j < 7 ; j++) {
129 if (mlc->di_map[j] == idx) found++;
130 }
131 if (!found) break;
132 }
133 return(idx); /* Note: It is guaranteed at least one above will match */
134}
135
136static inline void hil_mlc_clean_serio_map(hil_mlc *mlc) {
137 int idx;
138 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
139 int j, found;
140 found = 0;
141 for (j = 0; j < 7 ; j++) {
142 if (mlc->di_map[j] == idx) found++;
143 }
144 if (!found) mlc->serio_map[idx].di_revmap = -1;
145 }
146}
147
148static void hil_mlc_send_polls(hil_mlc *mlc) {
149 int did, i, cnt;
150 struct serio *serio;
151 struct serio_driver *drv;
152
153 i = cnt = 0;
154 did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8;
155 serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL;
156 drv = (serio != NULL) ? serio->drv : NULL;
157
158 while (mlc->icount < 15 - i) {
159 hil_packet p;
160 p = mlc->ipacket[i];
161 if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
162 if (drv == NULL || drv->interrupt == NULL) goto skip;
163
be577a52
MW		 164 drv->interrupt(serio, 0, 0);
165 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
166 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
167 drv->interrupt(serio, HIL_CMD_POL + cnt, 0);
1da177e4
LT		 168 skip:
169 did = (p & HIL_PKT_ADDR_MASK) >> 8;
170 serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL;
171 drv = (serio != NULL) ? serio->drv : NULL;
172 cnt = 0;
173 }
174 cnt++; i++;
175 if (drv == NULL || drv->interrupt == NULL) continue;
be577a52
MW		 176 drv->interrupt(serio, (p >> 24), 0);
177 drv->interrupt(serio, (p >> 16) & 0xff, 0);
178 drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0);
179 drv->interrupt(serio, p & 0xff, 0);
1da177e4
LT		 180 }
181}
182
183/*************************** State engine *********************************/
184
185#define HILSEN_SCHED 0x000100 /* Schedule the tasklet */
186#define HILSEN_BREAK 0x000200 /* Wait until next pass */
187#define HILSEN_UP 0x000400 /* relative node#, decrement */
188#define HILSEN_DOWN 0x000800 /* relative node#, increment */
189#define HILSEN_FOLLOW 0x001000 /* use retval as next node# */
190
191#define HILSEN_MASK 0x0000ff
192#define HILSEN_START 0
193#define HILSEN_RESTART 1
194#define HILSEN_DHR 9
195#define HILSEN_DHR2 10
196#define HILSEN_IFC 14
197#define HILSEN_HEAL0 16
198#define HILSEN_HEAL 18
199#define HILSEN_ACF 21
200#define HILSEN_ACF2 22
201#define HILSEN_DISC0 25
202#define HILSEN_DISC 27
203#define HILSEN_MATCH 40
204#define HILSEN_OPERATE 41
205#define HILSEN_PROBE 44
206#define HILSEN_DSR 52
207#define HILSEN_REPOLL 55
208#define HILSEN_IFCACF 58
209#define HILSEN_END 60
210
211#define HILSEN_NEXT (HILSEN_DOWN | 1)
212#define HILSEN_SAME (HILSEN_DOWN | 0)
213#define HILSEN_LAST (HILSEN_UP | 1)
214
215#define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK)
216#define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK)
217
218static int hilse_match(hil_mlc *mlc, int unused) {
219 int rc;
220 rc = hil_mlc_match_di_scratch(mlc);
221 if (rc == -1) {
222 rc = hil_mlc_find_free_di(mlc);
223 if (rc == -1) goto err;
224#ifdef HIL_MLC_DEBUG
225 printk(KERN_DEBUG PREFIX "new in slot %i\n", rc);
226#endif
227 hil_mlc_copy_di_scratch(mlc, rc);
228 mlc->di_map[mlc->ddi] = rc;
229 mlc->serio_map[rc].di_revmap = mlc->ddi;
230 hil_mlc_clean_serio_map(mlc);
231 serio_rescan(mlc->serio[rc]);
232 return -1;
233 }
234 mlc->di_map[mlc->ddi] = rc;
235#ifdef HIL_MLC_DEBUG
236 printk(KERN_DEBUG PREFIX "same in slot %i\n", rc);
237#endif
238 mlc->serio_map[rc].di_revmap = mlc->ddi;
239 hil_mlc_clean_serio_map(mlc);
240 return 0;
241 err:
242 printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n");
243 return 1;
244}
245
246/* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */
247static int hilse_init_lcv(hil_mlc *mlc, int unused) {
248 struct timeval tv;
249
250 do_gettimeofday(&tv);
251
252 if(mlc->lcv == 0) goto restart; /* First init, no need to dally */
253 if(tv.tv_sec - mlc->lcv_tv.tv_sec < 5) return -1;
254 restart:
255 mlc->lcv_tv = tv;
256 mlc->lcv = 0;
257 return 0;
258}
259
260static int hilse_inc_lcv(hil_mlc *mlc, int lim) {
261 if (mlc->lcv++ >= lim) return -1;
262 return 0;
263}
264
265#if 0
266static int hilse_set_lcv(hil_mlc *mlc, int val) {
267 mlc->lcv = val;
268 return 0;
269}
270#endif
271
272/* Management of the discovered device index (zero based, -1 means no devs) */
273static int hilse_set_ddi(hil_mlc *mlc, int val) {
274 mlc->ddi = val;
275 hil_mlc_clear_di_map(mlc, val + 1);
276 return 0;
277}
278
279static int hilse_dec_ddi(hil_mlc *mlc, int unused) {
280 mlc->ddi--;
281 if (mlc->ddi <= -1) {
282 mlc->ddi = -1;
283 hil_mlc_clear_di_map(mlc, 0);
284 return -1;
285 }
286 hil_mlc_clear_di_map(mlc, mlc->ddi + 1);
287 return 0;
288}
289
290static int hilse_inc_ddi(hil_mlc *mlc, int unused) {
291 if (mlc->ddi >= 6) {
292 BUG();
293 return -1;
294 }
295 mlc->ddi++;
296 return 0;
297}
298
299static int hilse_take_idd(hil_mlc *mlc, int unused) {
300 int i;
301
302 /* Help the state engine:
303 * Is this a real IDD response or just an echo?
304 *
305 * Real IDD response does not start with a command.
306 */
307 if (mlc->ipacket[0] & HIL_PKT_CMD) goto bail;
308 /* Should have the command echoed further down. */
309 for (i = 1; i < 16; i++) {
310 if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) ==
311 (mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) &&
312 (mlc->ipacket[i] & HIL_PKT_CMD) &&
313 ((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD))
314 break;
315 }
316 if (i > 15) goto bail;
317 /* And the rest of the packets should still be clear. */
318 while (++i < 16) {
319 if (mlc->ipacket[i]) break;
320 }
321 if (i < 16) goto bail;
322 for (i = 0; i < 16; i++) {
323 mlc->di_scratch.idd[i] =
324 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
325 }
326 /* Next step is to see if RSC supported */
327 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC)
328 return HILSEN_NEXT;
329 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
330 return HILSEN_DOWN | 4;
331 return 0;
332 bail:
333 mlc->ddi--;
334 return -1; /* This should send us off to ACF */
335}
336
337static int hilse_take_rsc(hil_mlc *mlc, int unused) {
338 int i;
339
340 for (i = 0; i < 16; i++) {
341 mlc->di_scratch.rsc[i] =
342 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
343 }
344 /* Next step is to see if EXD supported (IDD has already been read) */
345 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
346 return HILSEN_NEXT;
347 return 0;
348}
349
350static int hilse_take_exd(hil_mlc *mlc, int unused) {
351 int i;
352
353 for (i = 0; i < 16; i++) {
354 mlc->di_scratch.exd[i] =
355 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
356 }
357 /* Next step is to see if RNM supported. */
358 if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM)
359 return HILSEN_NEXT;
360 return 0;
361}
362
363static int hilse_take_rnm(hil_mlc *mlc, int unused) {
364 int i;
365
366 for (i = 0; i < 16; i++) {
367 mlc->di_scratch.rnm[i] =
368 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
369 }
370 do {
371 char nam[17];
372 snprintf(nam, 16, "%s", mlc->di_scratch.rnm);
373 nam[16] = '\0';
374 printk(KERN_INFO PREFIX "Device name gotten: %s\n", nam);
375 } while (0);
376 return 0;
377}
378
379static int hilse_operate(hil_mlc *mlc, int repoll) {
380
381 if (mlc->opercnt == 0) hil_mlcs_probe = 0;
382 mlc->opercnt = 1;
383
384 hil_mlc_send_polls(mlc);
385
386 if (!hil_mlcs_probe) return 0;
387 hil_mlcs_probe = 0;
388 mlc->opercnt = 0;
389 return 1;
390}
391
392#define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \
6ce6b3ae 393{ HILSE_FUNC, { .func = funct }, funct_arg, zero_rc, neg_rc, pos_rc },
1da177e4 394#define OUT(pack) \
6ce6b3ae 395{ HILSE_OUT, { .packet = pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 },
1da177e4 396#define CTS \
6ce6b3ae 397{ HILSE_CTS, { .packet = 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 },
1da177e4 398#define EXPECT(comp, to, got, got_wrong, timed_out) \
6ce6b3ae 399{ HILSE_EXPECT, { .packet = comp }, to, got, got_wrong, timed_out },
1da177e4 400#define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \
6ce6b3ae 401{ HILSE_EXPECT_LAST, { .packet = comp }, to, got, got_wrong, timed_out },
1da177e4 402#define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \
6ce6b3ae 403{ HILSE_EXPECT_DISC, { .packet = comp }, to, got, got_wrong, timed_out },
1da177e4 404#define IN(to, got, got_error, timed_out) \
6ce6b3ae 405{ HILSE_IN, { .packet = 0 }, to, got, got_error, timed_out },
1da177e4 406#define OUT_DISC(pack) \
6ce6b3ae 407{ HILSE_OUT_DISC, { .packet = pack }, 0, 0, 0, 0 },
1da177e4 408#define OUT_LAST(pack) \
6ce6b3ae 409{ HILSE_OUT_LAST, { .packet = pack }, 0, 0, 0, 0 },
1da177e4
LT		 410
411struct hilse_node hil_mlc_se[HILSEN_END] = {
412
413 /* 0 HILSEN_START */
414 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
415
416 /* 1 HILSEN_RESTART */
417 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
418 OUT(HIL_CTRL_ONLY) /* Disable APE */
419 CTS
420
421#define TEST_PACKET(x) \
422(HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x)
423
424 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5))
425 EXPECT(HIL_ERR_INT | TEST_PACKET(0x5),
426 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
427 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa))
428 EXPECT(HIL_ERR_INT | TEST_PACKET(0xa),
429 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
430 OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */
431
432 /* 9 HILSEN_DHR */
433 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
434
435 /* 10 HILSEN_DHR2 */
436 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
437 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
438 OUT(HIL_PKT_CMD | HIL_CMD_DHR)
439 IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT)
440
441 /* 14 HILSEN_IFC */
442 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
443 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
444 20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT )
445
446 /* If devices are there, they weren't in PUP or other loopback mode.
447 * We're more concerned at this point with restoring operation
448 * to devices than discovering new ones, so we try to salvage
449 * the loop configuration by closing off the loop.
450 */
451
452 /* 16 HILSEN_HEAL0 */
453 FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0)
454 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0)
455
456 /* 18 HILSEN_HEAL */
457 OUT_LAST(HIL_CMD_ELB)
458 EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT,
459 20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT)
460 FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0)
461
462 /* 21 HILSEN_ACF */
463 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0)
464
465 /* 22 HILSEN_ACF2 */
466 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
467 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
468 IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
469
470 /* 25 HILSEN_DISC0 */
471 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
472 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT,
473 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
474
475 /* Only enter here if response just received */
476 /* 27 HILSEN_DISC */
477 OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD)
478 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT,
479 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START)
480 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0)
481 FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW)
482 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC)
483 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT,
484 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
485 FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
486 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD)
487 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT,
488 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
489 FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
490 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM)
491 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT,
492 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
493 FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0)
494
495 /* 40 HILSEN_MATCH */
496 FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0)
497
498 /* 41 HILSEN_OPERATE */
499 OUT(HIL_PKT_CMD | HIL_CMD_POL)
500 EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT,
501 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
502 FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT)
503
504 /* 44 HILSEN_PROBE */
505 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT)
506 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
507 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
508 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
509 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
510 IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT)
511 OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB)
512 IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR)
513
514 /* 52 HILSEN_DSR */
515 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
516 OUT(HIL_PKT_CMD | HIL_CMD_DSR)
517 IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC)
518
519 /* 55 HILSEN_REPOLL */
520 OUT(HIL_PKT_CMD | HIL_CMD_RPL)
521 EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT,
522 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
523 FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE)
524
525 /* 58 HILSEN_IFCACF */
526 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
527 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
528 20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL)
529
530 /* 60 HILSEN_END */
531};
532
533static inline void hilse_setup_input(hil_mlc *mlc, struct hilse_node *node) {
534
535 switch (node->act) {
536 case HILSE_EXPECT_DISC:
537 mlc->imatch = node->object.packet;
538 mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
539 break;
540 case HILSE_EXPECT_LAST:
541 mlc->imatch = node->object.packet;
542 mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
543 break;
544 case HILSE_EXPECT:
545 mlc->imatch = node->object.packet;
546 break;
547 case HILSE_IN:
548 mlc->imatch = 0;
549 break;
550 default:
551 BUG();
552 }
553 mlc->istarted = 1;
554 mlc->intimeout = node->arg;
555 do_gettimeofday(&(mlc->instart));
556 mlc->icount = 15;
557 memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
b1eecf7e 558 BUG_ON(down_trylock(&(mlc->isem)));
1da177e4
LT		 559
560 return;
561}
562
563#ifdef HIL_MLC_DEBUG
564static int doze = 0;
565static int seidx; /* For debug */
566static int kick = 1;
567#endif
568
569static int hilse_donode (hil_mlc *mlc) {
570 struct hilse_node *node;
571 int nextidx = 0;
572 int sched_long = 0;
573 unsigned long flags;
574
575#ifdef HIL_MLC_DEBUG
576 if (mlc->seidx && (mlc->seidx != seidx) && mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) {
577 printk(KERN_DEBUG PREFIX "z%i \n%s {%i}", doze, kick ? "K" : "", mlc->seidx);
578 doze = 0;
579 }
580 kick = 0;
581
582 seidx = mlc->seidx;
583#endif
584 node = hil_mlc_se + mlc->seidx;
585
586 switch (node->act) {
587 int rc;
588 hil_packet pack;
589
590 case HILSE_FUNC:
591 if (node->object.func == NULL) break;
592 rc = node->object.func(mlc, node->arg);
593 nextidx = (rc > 0) ? node->ugly :
594 ((rc < 0) ? node->bad : node->good);
595 if (nextidx == HILSEN_FOLLOW) nextidx = rc;
596 break;
597 case HILSE_EXPECT_LAST:
598 case HILSE_EXPECT_DISC:
599 case HILSE_EXPECT:
600 case HILSE_IN:
601 /* Already set up from previous HILSE_OUT_* */
602 write_lock_irqsave(&(mlc->lock), flags);
603 rc = mlc->in(mlc, node->arg);
604 if (rc == 2) {
605 nextidx = HILSEN_DOZE;
606 sched_long = 1;
607 write_unlock_irqrestore(&(mlc->lock), flags);
608 break;
609 }
610 if (rc == 1) nextidx = node->ugly;
611 else if (rc == 0) nextidx = node->good;
612 else nextidx = node->bad;
613 mlc->istarted = 0;
614 write_unlock_irqrestore(&(mlc->lock), flags);
615 break;
616 case HILSE_OUT_LAST:
617 write_lock_irqsave(&(mlc->lock), flags);
618 pack = node->object.packet;
619 pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
620 goto out;
621 case HILSE_OUT_DISC:
622 write_lock_irqsave(&(mlc->lock), flags);
623 pack = node->object.packet;
624 pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
625 goto out;
626 case HILSE_OUT:
627 write_lock_irqsave(&(mlc->lock), flags);
628 pack = node->object.packet;
629 out:
630 if (mlc->istarted) goto out2;
631 /* Prepare to receive input */
632 if ((node + 1)->act & HILSE_IN)
633 hilse_setup_input(mlc, node + 1);
634
635 out2:
636 write_unlock_irqrestore(&(mlc->lock), flags);
637
638 if (down_trylock(&mlc->osem)) {
639 nextidx = HILSEN_DOZE;
640 break;
641 }
642 up(&mlc->osem);
643
644 write_lock_irqsave(&(mlc->lock), flags);
645 if (!(mlc->ostarted)) {
646 mlc->ostarted = 1;
647 mlc->opacket = pack;
648 mlc->out(mlc);
649 nextidx = HILSEN_DOZE;
650 write_unlock_irqrestore(&(mlc->lock), flags);
651 break;
652 }
653 mlc->ostarted = 0;
654 do_gettimeofday(&(mlc->instart));
655 write_unlock_irqrestore(&(mlc->lock), flags);
656 nextidx = HILSEN_NEXT;
657 break;
658 case HILSE_CTS:
659 nextidx = mlc->cts(mlc) ? node->bad : node->good;
660 break;
661 default:
662 BUG();
663 nextidx = 0;
664 break;
665 }
666
667#ifdef HIL_MLC_DEBUG
668 if (nextidx == HILSEN_DOZE) doze++;
669#endif
670
671 while (nextidx & HILSEN_SCHED) {
672 struct timeval tv;
673
674 if (!sched_long) goto sched;
675
676 do_gettimeofday(&tv);
677 tv.tv_usec += 1000000 * (tv.tv_sec - mlc->instart.tv_sec);
678 tv.tv_usec -= mlc->instart.tv_usec;
679 if (tv.tv_usec >= mlc->intimeout) goto sched;
680 tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / 1000000;
681 if (!tv.tv_usec) goto sched;
682 mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec);
683 break;
684 sched:
685 tasklet_schedule(&hil_mlcs_tasklet);
686 break;
687 }
688 if (nextidx & HILSEN_DOWN) mlc->seidx += nextidx & HILSEN_MASK;
689 else if (nextidx & HILSEN_UP) mlc->seidx -= nextidx & HILSEN_MASK;
690 else mlc->seidx = nextidx & HILSEN_MASK;
691
692 if (nextidx & HILSEN_BREAK) return 1;
693 return 0;
694}
695
696/******************** tasklet context functions **************************/
697static void hil_mlcs_process(unsigned long unused) {
698 struct list_head *tmp;
699
700 read_lock(&hil_mlcs_lock);
701 list_for_each(tmp, &hil_mlcs) {
702 struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list);
703 while (hilse_donode(mlc) == 0) {
704#ifdef HIL_MLC_DEBUG
705 if (mlc->seidx != 41 &&
706 mlc->seidx != 42 &&
707 mlc->seidx != 43)
708 printk(KERN_DEBUG PREFIX " + ");
709#endif
710 };
711 }
712 read_unlock(&hil_mlcs_lock);
713}
714
715/************************* Keepalive timer task *********************/
716
717void hil_mlcs_timer (unsigned long data) {
718 hil_mlcs_probe = 1;
719 tasklet_schedule(&hil_mlcs_tasklet);
720 /* Re-insert the periodic task. */
721 if (!timer_pending(&hil_mlcs_kicker))
722 mod_timer(&hil_mlcs_kicker, jiffies + HZ);
723}
724
725/******************** user/kernel context functions **********************/
726
727static int hil_mlc_serio_write(struct serio *serio, unsigned char c) {
728 struct hil_mlc_serio_map *map;
729 struct hil_mlc *mlc;
730 struct serio_driver *drv;
731 uint8_t *idx, *last;
732
733 map = serio->port_data;
734 if (map == NULL) {
735 BUG();
736 return -EIO;
737 }
738 mlc = map->mlc;
739 if (mlc == NULL) {
740 BUG();
741 return -EIO;
742 }
743 mlc->serio_opacket[map->didx] |=
744 ((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));
745
746 if (mlc->serio_oidx[map->didx] >= 3) {
747 /* for now only commands */
748 if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
749 return -EIO;
750 switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
751 case HIL_CMD_IDD:
752 idx = mlc->di[map->didx].idd;
753 goto emu;
754 case HIL_CMD_RSC:
755 idx = mlc->di[map->didx].rsc;
756 goto emu;
757 case HIL_CMD_EXD:
758 idx = mlc->di[map->didx].exd;
759 goto emu;
760 case HIL_CMD_RNM:
761 idx = mlc->di[map->didx].rnm;
762 goto emu;
763 default:
764 break;
765 }
766 mlc->serio_oidx[map->didx] = 0;
767 mlc->serio_opacket[map->didx] = 0;
768 }
769
770 mlc->serio_oidx[map->didx]++;
771 return -EIO;
772 emu:
773 drv = serio->drv;
774 if (drv == NULL) {
775 BUG();
776 return -EIO;
777 }
778 last = idx + 15;
779 while ((last != idx) && (*last == 0)) last--;
780
781 while (idx != last) {
be577a52
MW		 782 drv->interrupt(serio, 0, 0);
783 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
784 drv->interrupt(serio, 0, 0);
785 drv->interrupt(serio, *idx, 0);
1da177e4
LT		 786 idx++;
787 }
be577a52
MW		 788 drv->interrupt(serio, 0, 0);
789 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
790 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
791 drv->interrupt(serio, *idx, 0);
1da177e4
LT		 792
793 mlc->serio_oidx[map->didx] = 0;
794 mlc->serio_opacket[map->didx] = 0;
795
796 return 0;
797}
798
799static int hil_mlc_serio_open(struct serio *serio) {
800 struct hil_mlc_serio_map *map;
801 struct hil_mlc *mlc;
802
6ab0f5cd
MW		 803 if (serio_get_drvdata(serio) != NULL)
804 return -EBUSY;
1da177e4
LT		 805
806 map = serio->port_data;
807 if (map == NULL) {
808 BUG();
809 return -ENODEV;
810 }
811 mlc = map->mlc;
812 if (mlc == NULL) {
813 BUG();
814 return -ENODEV;
815 }
816
817 return 0;
818}
819
820static void hil_mlc_serio_close(struct serio *serio) {
821 struct hil_mlc_serio_map *map;
822 struct hil_mlc *mlc;
823
824 map = serio->port_data;
825 if (map == NULL) {
826 BUG();
827 return;
828 }
829 mlc = map->mlc;
830 if (mlc == NULL) {
831 BUG();
832 return;
833 }
834
6ab0f5cd 835 serio_set_drvdata(serio, NULL);
1da177e4
LT		 836 serio->drv = NULL;
837 /* TODO wake up interruptable */
838}
839
6ab0f5cd
MW		 840static struct serio_device_id hil_mlc_serio_id = {
841 .type = SERIO_HIL_MLC,
842 .proto = SERIO_HIL,
843 .extra = SERIO_ANY,
844 .id = SERIO_ANY,
845};
846
1da177e4
LT		 847int hil_mlc_register(hil_mlc *mlc) {
848 int i;
849 unsigned long flags;
850
851 if (mlc == NULL) {
852 return -EINVAL;
853 }
854
855 mlc->istarted = 0;
856 mlc->ostarted = 0;
857
858 rwlock_init(&mlc->lock);
859 init_MUTEX(&(mlc->osem));
860
861 init_MUTEX(&(mlc->isem));
862 mlc->icount = -1;
863 mlc->imatch = 0;
864
865 mlc->opercnt = 0;
866
867 init_MUTEX_LOCKED(&(mlc->csem));
868
869 hil_mlc_clear_di_scratch(mlc);
870 hil_mlc_clear_di_map(mlc, 0);
871 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
872 struct serio *mlc_serio;
873 hil_mlc_copy_di_scratch(mlc, i);
b39787a9 874 mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
1da177e4 875 mlc->serio[i] = mlc_serio;
6ab0f5cd 876 mlc_serio->id = hil_mlc_serio_id;
1da177e4
LT		 877 mlc_serio->write = hil_mlc_serio_write;
878 mlc_serio->open = hil_mlc_serio_open;
879 mlc_serio->close = hil_mlc_serio_close;
880 mlc_serio->port_data = &(mlc->serio_map[i]);
881 mlc->serio_map[i].mlc = mlc;
882 mlc->serio_map[i].didx = i;
883 mlc->serio_map[i].di_revmap = -1;
884 mlc->serio_opacket[i] = 0;
885 mlc->serio_oidx[i] = 0;
886 serio_register_port(mlc_serio);
887 }
888
889 mlc->tasklet = &hil_mlcs_tasklet;
890
891 write_lock_irqsave(&hil_mlcs_lock, flags);
892 list_add_tail(&mlc->list, &hil_mlcs);
893 mlc->seidx = HILSEN_START;
894 write_unlock_irqrestore(&hil_mlcs_lock, flags);
895
896 tasklet_schedule(&hil_mlcs_tasklet);
897 return 0;
898}
899
900int hil_mlc_unregister(hil_mlc *mlc) {
901 struct list_head *tmp;
902 unsigned long flags;
903 int i;
904
905 if (mlc == NULL)
906 return -EINVAL;
907
908 write_lock_irqsave(&hil_mlcs_lock, flags);
909 list_for_each(tmp, &hil_mlcs) {
910 if (list_entry(tmp, hil_mlc, list) == mlc)
911 goto found;
912 }
913
914 /* not found in list */
915 write_unlock_irqrestore(&hil_mlcs_lock, flags);
916 tasklet_schedule(&hil_mlcs_tasklet);
917 return -ENODEV;
918
919 found:
920 list_del(tmp);
921 write_unlock_irqrestore(&hil_mlcs_lock, flags);
922
923 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
924 serio_unregister_port(mlc->serio[i]);
925 mlc->serio[i] = NULL;
926 }
927
928 tasklet_schedule(&hil_mlcs_tasklet);
929 return 0;
930}
931
932/**************************** Module interface *************************/
933
934static int __init hil_mlc_init(void)
935{
936 init_timer(&hil_mlcs_kicker);
937 hil_mlcs_kicker.expires = jiffies + HZ;
938 hil_mlcs_kicker.function = &hil_mlcs_timer;
939 add_timer(&hil_mlcs_kicker);
940
941 tasklet_enable(&hil_mlcs_tasklet);
942
943 return 0;
944}
945
946static void __exit hil_mlc_exit(void)
947{
948 del_timer(&hil_mlcs_kicker);
949
950 tasklet_disable(&hil_mlcs_tasklet);
951 tasklet_kill(&hil_mlcs_tasklet);
952}
953
954module_init(hil_mlc_init);
955module_exit(hil_mlc_exit);
Linux 6.x block layer and io_uring tree(s)