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8#include <linux/bitops.h>
9#include <linux/counter.h>
10#include <linux/device.h>
11#include <linux/errno.h>
12#include <linux/io.h>
13#include <linux/ioport.h>
14#include <linux/isa.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/types.h>
19
20#define QUAD8_EXTENT 32
21
22static unsigned int base[max_num_isa_dev(QUAD8_EXTENT)];
23static unsigned int num_quad8;
24module_param_hw_array(base, uint, ioport, &num_quad8, 0);
25MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
26
27#define QUAD8_NUM_COUNTERS 8
28
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42
43
44struct quad8 {
45 struct mutex lock;
46 struct counter_device counter;
47 unsigned int fck_prescaler[QUAD8_NUM_COUNTERS];
48 unsigned int preset[QUAD8_NUM_COUNTERS];
49 unsigned int count_mode[QUAD8_NUM_COUNTERS];
50 unsigned int quadrature_mode[QUAD8_NUM_COUNTERS];
51 unsigned int quadrature_scale[QUAD8_NUM_COUNTERS];
52 unsigned int ab_enable[QUAD8_NUM_COUNTERS];
53 unsigned int preset_enable[QUAD8_NUM_COUNTERS];
54 unsigned int synchronous_mode[QUAD8_NUM_COUNTERS];
55 unsigned int index_polarity[QUAD8_NUM_COUNTERS];
56 unsigned int cable_fault_enable;
57 unsigned int base;
58};
59
60#define QUAD8_REG_CHAN_OP 0x11
61#define QUAD8_REG_INDEX_INPUT_LEVELS 0x16
62#define QUAD8_DIFF_ENCODER_CABLE_STATUS 0x17
63
64#define QUAD8_FLAG_BT BIT(0)
65
66#define QUAD8_FLAG_CT BIT(1)
67
68#define QUAD8_FLAG_E BIT(4)
69
70#define QUAD8_FLAG_UD BIT(5)
71
72#define QUAD8_CTR_RLD 0x00
73
74#define QUAD8_CTR_CMR 0x20
75
76#define QUAD8_CTR_IOR 0x40
77
78#define QUAD8_CTR_IDR 0x60
79
80#define QUAD8_RLD_RESET_BP 0x01
81
82#define QUAD8_RLD_RESET_CNTR 0x02
83
84#define QUAD8_RLD_RESET_FLAGS 0x04
85
86#define QUAD8_RLD_RESET_E 0x06
87
88#define QUAD8_RLD_PRESET_CNTR 0x08
89
90#define QUAD8_RLD_CNTR_OUT 0x10
91
92#define QUAD8_RLD_PRESET_PSC 0x18
93#define QUAD8_CHAN_OP_ENABLE_COUNTERS 0x00
94#define QUAD8_CHAN_OP_RESET_COUNTERS 0x01
95#define QUAD8_CMR_QUADRATURE_X1 0x08
96#define QUAD8_CMR_QUADRATURE_X2 0x10
97#define QUAD8_CMR_QUADRATURE_X4 0x18
98
99static int quad8_signal_read(struct counter_device *counter,
100 struct counter_signal *signal, enum counter_signal_value *val)
101{
102 const struct quad8 *const priv = counter->priv;
103 unsigned int state;
104
105
106 if (signal->id < 16)
107 return -EINVAL;
108
109 state = inb(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS)
110 & BIT(signal->id - 16);
111
112 *val = (state) ? COUNTER_SIGNAL_HIGH : COUNTER_SIGNAL_LOW;
113
114 return 0;
115}
116
117static int quad8_count_read(struct counter_device *counter,
118 struct counter_count *count, unsigned long *val)
119{
120 struct quad8 *const priv = counter->priv;
121 const int base_offset = priv->base + 2 * count->id;
122 unsigned int flags;
123 unsigned int borrow;
124 unsigned int carry;
125 int i;
126
127 flags = inb(base_offset + 1);
128 borrow = flags & QUAD8_FLAG_BT;
129 carry = !!(flags & QUAD8_FLAG_CT);
130
131
132 *val = (unsigned long)(borrow ^ carry) << 24;
133
134 mutex_lock(&priv->lock);
135
136
137 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,
138 base_offset + 1);
139
140 for (i = 0; i < 3; i++)
141 *val |= (unsigned long)inb(base_offset) << (8 * i);
142
143 mutex_unlock(&priv->lock);
144
145 return 0;
146}
147
148static int quad8_count_write(struct counter_device *counter,
149 struct counter_count *count, unsigned long val)
150{
151 struct quad8 *const priv = counter->priv;
152 const int base_offset = priv->base + 2 * count->id;
153 int i;
154
155
156 if (val > 0xFFFFFF)
157 return -EINVAL;
158
159 mutex_lock(&priv->lock);
160
161
162 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
163
164
165 for (i = 0; i < 3; i++)
166 outb(val >> (8 * i), base_offset);
167
168
169 outb(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1);
170
171
172 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
173
174
175 val = priv->preset[count->id];
176 for (i = 0; i < 3; i++)
177 outb(val >> (8 * i), base_offset);
178
179
180 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1);
181
182 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
183
184 mutex_unlock(&priv->lock);
185
186 return 0;
187}
188
189enum quad8_count_function {
190 QUAD8_COUNT_FUNCTION_PULSE_DIRECTION = 0,
191 QUAD8_COUNT_FUNCTION_QUADRATURE_X1,
192 QUAD8_COUNT_FUNCTION_QUADRATURE_X2,
193 QUAD8_COUNT_FUNCTION_QUADRATURE_X4
194};
195
196static const enum counter_count_function quad8_count_functions_list[] = {
197 [QUAD8_COUNT_FUNCTION_PULSE_DIRECTION] = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
198 [QUAD8_COUNT_FUNCTION_QUADRATURE_X1] = COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A,
199 [QUAD8_COUNT_FUNCTION_QUADRATURE_X2] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
200 [QUAD8_COUNT_FUNCTION_QUADRATURE_X4] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4
201};
202
203static int quad8_function_get(struct counter_device *counter,
204 struct counter_count *count, size_t *function)
205{
206 struct quad8 *const priv = counter->priv;
207 const int id = count->id;
208
209 mutex_lock(&priv->lock);
210
211 if (priv->quadrature_mode[id])
212 switch (priv->quadrature_scale[id]) {
213 case 0:
214 *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X1;
215 break;
216 case 1:
217 *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X2;
218 break;
219 case 2:
220 *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X4;
221 break;
222 }
223 else
224 *function = QUAD8_COUNT_FUNCTION_PULSE_DIRECTION;
225
226 mutex_unlock(&priv->lock);
227
228 return 0;
229}
230
231static int quad8_function_set(struct counter_device *counter,
232 struct counter_count *count, size_t function)
233{
234 struct quad8 *const priv = counter->priv;
235 const int id = count->id;
236 unsigned int *const quadrature_mode = priv->quadrature_mode + id;
237 unsigned int *const scale = priv->quadrature_scale + id;
238 unsigned int *const synchronous_mode = priv->synchronous_mode + id;
239 const int base_offset = priv->base + 2 * id + 1;
240 unsigned int mode_cfg;
241 unsigned int idr_cfg;
242
243 mutex_lock(&priv->lock);
244
245 mode_cfg = priv->count_mode[id] << 1;
246 idr_cfg = priv->index_polarity[id] << 1;
247
248 if (function == QUAD8_COUNT_FUNCTION_PULSE_DIRECTION) {
249 *quadrature_mode = 0;
250
251
252 *scale = 0;
253
254
255 if (*synchronous_mode) {
256 *synchronous_mode = 0;
257
258 outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
259 }
260 } else {
261 *quadrature_mode = 1;
262
263 switch (function) {
264 case QUAD8_COUNT_FUNCTION_QUADRATURE_X1:
265 *scale = 0;
266 mode_cfg |= QUAD8_CMR_QUADRATURE_X1;
267 break;
268 case QUAD8_COUNT_FUNCTION_QUADRATURE_X2:
269 *scale = 1;
270 mode_cfg |= QUAD8_CMR_QUADRATURE_X2;
271 break;
272 case QUAD8_COUNT_FUNCTION_QUADRATURE_X4:
273 *scale = 2;
274 mode_cfg |= QUAD8_CMR_QUADRATURE_X4;
275 break;
276 }
277 }
278
279
280 outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
281
282 mutex_unlock(&priv->lock);
283
284 return 0;
285}
286
287static void quad8_direction_get(struct counter_device *counter,
288 struct counter_count *count, enum counter_count_direction *direction)
289{
290 const struct quad8 *const priv = counter->priv;
291 unsigned int ud_flag;
292 const unsigned int flag_addr = priv->base + 2 * count->id + 1;
293
294
295 ud_flag = inb(flag_addr) & QUAD8_FLAG_UD;
296
297 *direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD :
298 COUNTER_COUNT_DIRECTION_BACKWARD;
299}
300
301enum quad8_synapse_action {
302 QUAD8_SYNAPSE_ACTION_NONE = 0,
303 QUAD8_SYNAPSE_ACTION_RISING_EDGE,
304 QUAD8_SYNAPSE_ACTION_FALLING_EDGE,
305 QUAD8_SYNAPSE_ACTION_BOTH_EDGES
306};
307
308static const enum counter_synapse_action quad8_index_actions_list[] = {
309 [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
310 [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE
311};
312
313static const enum counter_synapse_action quad8_synapse_actions_list[] = {
314 [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
315 [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
316 [QUAD8_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
317 [QUAD8_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES
318};
319
320static int quad8_action_get(struct counter_device *counter,
321 struct counter_count *count, struct counter_synapse *synapse,
322 size_t *action)
323{
324 struct quad8 *const priv = counter->priv;
325 int err;
326 size_t function = 0;
327 const size_t signal_a_id = count->synapses[0].signal->id;
328 enum counter_count_direction direction;
329
330
331 if (synapse->signal->id >= 16) {
332 if (priv->preset_enable[count->id])
333 *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
334 else
335 *action = QUAD8_SYNAPSE_ACTION_NONE;
336
337 return 0;
338 }
339
340 err = quad8_function_get(counter, count, &function);
341 if (err)
342 return err;
343
344
345 *action = QUAD8_SYNAPSE_ACTION_NONE;
346
347
348 switch (function) {
349 case QUAD8_COUNT_FUNCTION_PULSE_DIRECTION:
350 if (synapse->signal->id == signal_a_id)
351 *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
352 break;
353 case QUAD8_COUNT_FUNCTION_QUADRATURE_X1:
354 if (synapse->signal->id == signal_a_id) {
355 quad8_direction_get(counter, count, &direction);
356
357 if (direction == COUNTER_COUNT_DIRECTION_FORWARD)
358 *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
359 else
360 *action = QUAD8_SYNAPSE_ACTION_FALLING_EDGE;
361 }
362 break;
363 case QUAD8_COUNT_FUNCTION_QUADRATURE_X2:
364 if (synapse->signal->id == signal_a_id)
365 *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES;
366 break;
367 case QUAD8_COUNT_FUNCTION_QUADRATURE_X4:
368 *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES;
369 break;
370 }
371
372 return 0;
373}
374
375static const struct counter_ops quad8_ops = {
376 .signal_read = quad8_signal_read,
377 .count_read = quad8_count_read,
378 .count_write = quad8_count_write,
379 .function_get = quad8_function_get,
380 .function_set = quad8_function_set,
381 .action_get = quad8_action_get
382};
383
384static const char *const quad8_index_polarity_modes[] = {
385 "negative",
386 "positive"
387};
388
389static int quad8_index_polarity_get(struct counter_device *counter,
390 struct counter_signal *signal, size_t *index_polarity)
391{
392 const struct quad8 *const priv = counter->priv;
393 const size_t channel_id = signal->id - 16;
394
395 *index_polarity = priv->index_polarity[channel_id];
396
397 return 0;
398}
399
400static int quad8_index_polarity_set(struct counter_device *counter,
401 struct counter_signal *signal, size_t index_polarity)
402{
403 struct quad8 *const priv = counter->priv;
404 const size_t channel_id = signal->id - 16;
405 const int base_offset = priv->base + 2 * channel_id + 1;
406 unsigned int idr_cfg = index_polarity << 1;
407
408 mutex_lock(&priv->lock);
409
410 idr_cfg |= priv->synchronous_mode[channel_id];
411
412 priv->index_polarity[channel_id] = index_polarity;
413
414
415 outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
416
417 mutex_unlock(&priv->lock);
418
419 return 0;
420}
421
422static struct counter_signal_enum_ext quad8_index_pol_enum = {
423 .items = quad8_index_polarity_modes,
424 .num_items = ARRAY_SIZE(quad8_index_polarity_modes),
425 .get = quad8_index_polarity_get,
426 .set = quad8_index_polarity_set
427};
428
429static const char *const quad8_synchronous_modes[] = {
430 "non-synchronous",
431 "synchronous"
432};
433
434static int quad8_synchronous_mode_get(struct counter_device *counter,
435 struct counter_signal *signal, size_t *synchronous_mode)
436{
437 const struct quad8 *const priv = counter->priv;
438 const size_t channel_id = signal->id - 16;
439
440 *synchronous_mode = priv->synchronous_mode[channel_id];
441
442 return 0;
443}
444
445static int quad8_synchronous_mode_set(struct counter_device *counter,
446 struct counter_signal *signal, size_t synchronous_mode)
447{
448 struct quad8 *const priv = counter->priv;
449 const size_t channel_id = signal->id - 16;
450 const int base_offset = priv->base + 2 * channel_id + 1;
451 unsigned int idr_cfg = synchronous_mode;
452
453 mutex_lock(&priv->lock);
454
455 idr_cfg |= priv->index_polarity[channel_id] << 1;
456
457
458 if (synchronous_mode && !priv->quadrature_mode[channel_id]) {
459 mutex_unlock(&priv->lock);
460 return -EINVAL;
461 }
462
463 priv->synchronous_mode[channel_id] = synchronous_mode;
464
465
466 outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
467
468 mutex_unlock(&priv->lock);
469
470 return 0;
471}
472
473static struct counter_signal_enum_ext quad8_syn_mode_enum = {
474 .items = quad8_synchronous_modes,
475 .num_items = ARRAY_SIZE(quad8_synchronous_modes),
476 .get = quad8_synchronous_mode_get,
477 .set = quad8_synchronous_mode_set
478};
479
480static ssize_t quad8_count_floor_read(struct counter_device *counter,
481 struct counter_count *count, void *private, char *buf)
482{
483
484 return sprintf(buf, "0\n");
485}
486
487static int quad8_count_mode_get(struct counter_device *counter,
488 struct counter_count *count, size_t *cnt_mode)
489{
490 const struct quad8 *const priv = counter->priv;
491
492
493 switch (priv->count_mode[count->id]) {
494 case 0:
495 *cnt_mode = COUNTER_COUNT_MODE_NORMAL;
496 break;
497 case 1:
498 *cnt_mode = COUNTER_COUNT_MODE_RANGE_LIMIT;
499 break;
500 case 2:
501 *cnt_mode = COUNTER_COUNT_MODE_NON_RECYCLE;
502 break;
503 case 3:
504 *cnt_mode = COUNTER_COUNT_MODE_MODULO_N;
505 break;
506 }
507
508 return 0;
509}
510
511static int quad8_count_mode_set(struct counter_device *counter,
512 struct counter_count *count, size_t cnt_mode)
513{
514 struct quad8 *const priv = counter->priv;
515 unsigned int mode_cfg;
516 const int base_offset = priv->base + 2 * count->id + 1;
517
518
519 switch (cnt_mode) {
520 case COUNTER_COUNT_MODE_NORMAL:
521 cnt_mode = 0;
522 break;
523 case COUNTER_COUNT_MODE_RANGE_LIMIT:
524 cnt_mode = 1;
525 break;
526 case COUNTER_COUNT_MODE_NON_RECYCLE:
527 cnt_mode = 2;
528 break;
529 case COUNTER_COUNT_MODE_MODULO_N:
530 cnt_mode = 3;
531 break;
532 }
533
534 mutex_lock(&priv->lock);
535
536 priv->count_mode[count->id] = cnt_mode;
537
538
539 mode_cfg = cnt_mode << 1;
540
541
542 if (priv->quadrature_mode[count->id])
543 mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3;
544
545
546 outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
547
548 mutex_unlock(&priv->lock);
549
550 return 0;
551}
552
553static struct counter_count_enum_ext quad8_cnt_mode_enum = {
554 .items = counter_count_mode_str,
555 .num_items = ARRAY_SIZE(counter_count_mode_str),
556 .get = quad8_count_mode_get,
557 .set = quad8_count_mode_set
558};
559
560static ssize_t quad8_count_direction_read(struct counter_device *counter,
561 struct counter_count *count, void *priv, char *buf)
562{
563 enum counter_count_direction dir;
564
565 quad8_direction_get(counter, count, &dir);
566
567 return sprintf(buf, "%s\n", counter_count_direction_str[dir]);
568}
569
570static ssize_t quad8_count_enable_read(struct counter_device *counter,
571 struct counter_count *count, void *private, char *buf)
572{
573 const struct quad8 *const priv = counter->priv;
574
575 return sprintf(buf, "%u\n", priv->ab_enable[count->id]);
576}
577
578static ssize_t quad8_count_enable_write(struct counter_device *counter,
579 struct counter_count *count, void *private, const char *buf, size_t len)
580{
581 struct quad8 *const priv = counter->priv;
582 const int base_offset = priv->base + 2 * count->id;
583 int err;
584 bool ab_enable;
585 unsigned int ior_cfg;
586
587 err = kstrtobool(buf, &ab_enable);
588 if (err)
589 return err;
590
591 mutex_lock(&priv->lock);
592
593 priv->ab_enable[count->id] = ab_enable;
594
595 ior_cfg = ab_enable | priv->preset_enable[count->id] << 1;
596
597
598 outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
599
600 mutex_unlock(&priv->lock);
601
602 return len;
603}
604
605static const char *const quad8_noise_error_states[] = {
606 "No excessive noise is present at the count inputs",
607 "Excessive noise is present at the count inputs"
608};
609
610static int quad8_error_noise_get(struct counter_device *counter,
611 struct counter_count *count, size_t *noise_error)
612{
613 const struct quad8 *const priv = counter->priv;
614 const int base_offset = priv->base + 2 * count->id + 1;
615
616 *noise_error = !!(inb(base_offset) & QUAD8_FLAG_E);
617
618 return 0;
619}
620
621static struct counter_count_enum_ext quad8_error_noise_enum = {
622 .items = quad8_noise_error_states,
623 .num_items = ARRAY_SIZE(quad8_noise_error_states),
624 .get = quad8_error_noise_get
625};
626
627static ssize_t quad8_count_preset_read(struct counter_device *counter,
628 struct counter_count *count, void *private, char *buf)
629{
630 const struct quad8 *const priv = counter->priv;
631
632 return sprintf(buf, "%u\n", priv->preset[count->id]);
633}
634
635static void quad8_preset_register_set(struct quad8 *const priv, const int id,
636 const unsigned int preset)
637{
638 const unsigned int base_offset = priv->base + 2 * id;
639 int i;
640
641 priv->preset[id] = preset;
642
643
644 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
645
646
647 for (i = 0; i < 3; i++)
648 outb(preset >> (8 * i), base_offset);
649}
650
651static ssize_t quad8_count_preset_write(struct counter_device *counter,
652 struct counter_count *count, void *private, const char *buf, size_t len)
653{
654 struct quad8 *const priv = counter->priv;
655 unsigned int preset;
656 int ret;
657
658 ret = kstrtouint(buf, 0, &preset);
659 if (ret)
660 return ret;
661
662
663 if (preset > 0xFFFFFF)
664 return -EINVAL;
665
666 mutex_lock(&priv->lock);
667
668 quad8_preset_register_set(priv, count->id, preset);
669
670 mutex_unlock(&priv->lock);
671
672 return len;
673}
674
675static ssize_t quad8_count_ceiling_read(struct counter_device *counter,
676 struct counter_count *count, void *private, char *buf)
677{
678 struct quad8 *const priv = counter->priv;
679
680 mutex_lock(&priv->lock);
681
682
683 switch (priv->count_mode[count->id]) {
684 case 1:
685 case 3:
686 mutex_unlock(&priv->lock);
687 return sprintf(buf, "%u\n", priv->preset[count->id]);
688 }
689
690 mutex_unlock(&priv->lock);
691
692
693 return sprintf(buf, "33554431\n");
694}
695
696static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
697 struct counter_count *count, void *private, const char *buf, size_t len)
698{
699 struct quad8 *const priv = counter->priv;
700 unsigned int ceiling;
701 int ret;
702
703 ret = kstrtouint(buf, 0, &ceiling);
704 if (ret)
705 return ret;
706
707
708 if (ceiling > 0xFFFFFF)
709 return -EINVAL;
710
711 mutex_lock(&priv->lock);
712
713
714 switch (priv->count_mode[count->id]) {
715 case 1:
716 case 3:
717 quad8_preset_register_set(priv, count->id, ceiling);
718 break;
719 }
720
721 mutex_unlock(&priv->lock);
722
723 return len;
724}
725
726static ssize_t quad8_count_preset_enable_read(struct counter_device *counter,
727 struct counter_count *count, void *private, char *buf)
728{
729 const struct quad8 *const priv = counter->priv;
730
731 return sprintf(buf, "%u\n", !priv->preset_enable[count->id]);
732}
733
734static ssize_t quad8_count_preset_enable_write(struct counter_device *counter,
735 struct counter_count *count, void *private, const char *buf, size_t len)
736{
737 struct quad8 *const priv = counter->priv;
738 const int base_offset = priv->base + 2 * count->id + 1;
739 bool preset_enable;
740 int ret;
741 unsigned int ior_cfg;
742
743 ret = kstrtobool(buf, &preset_enable);
744 if (ret)
745 return ret;
746
747
748 preset_enable = !preset_enable;
749
750 mutex_lock(&priv->lock);
751
752 priv->preset_enable[count->id] = preset_enable;
753
754 ior_cfg = priv->ab_enable[count->id] | (unsigned int)preset_enable << 1;
755
756
757 outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
758
759 mutex_unlock(&priv->lock);
760
761 return len;
762}
763
764static ssize_t quad8_signal_cable_fault_read(struct counter_device *counter,
765 struct counter_signal *signal,
766 void *private, char *buf)
767{
768 struct quad8 *const priv = counter->priv;
769 const size_t channel_id = signal->id / 2;
770 bool disabled;
771 unsigned int status;
772 unsigned int fault;
773
774 mutex_lock(&priv->lock);
775
776 disabled = !(priv->cable_fault_enable & BIT(channel_id));
777
778 if (disabled) {
779 mutex_unlock(&priv->lock);
780 return -EINVAL;
781 }
782
783
784 status = inb(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
785
786 mutex_unlock(&priv->lock);
787
788
789 fault = !(status & BIT(channel_id));
790
791 return sprintf(buf, "%u\n", fault);
792}
793
794static ssize_t quad8_signal_cable_fault_enable_read(
795 struct counter_device *counter, struct counter_signal *signal,
796 void *private, char *buf)
797{
798 const struct quad8 *const priv = counter->priv;
799 const size_t channel_id = signal->id / 2;
800 const unsigned int enb = !!(priv->cable_fault_enable & BIT(channel_id));
801
802 return sprintf(buf, "%u\n", enb);
803}
804
805static ssize_t quad8_signal_cable_fault_enable_write(
806 struct counter_device *counter, struct counter_signal *signal,
807 void *private, const char *buf, size_t len)
808{
809 struct quad8 *const priv = counter->priv;
810 const size_t channel_id = signal->id / 2;
811 bool enable;
812 int ret;
813 unsigned int cable_fault_enable;
814
815 ret = kstrtobool(buf, &enable);
816 if (ret)
817 return ret;
818
819 mutex_lock(&priv->lock);
820
821 if (enable)
822 priv->cable_fault_enable |= BIT(channel_id);
823 else
824 priv->cable_fault_enable &= ~BIT(channel_id);
825
826
827 cable_fault_enable = ~priv->cable_fault_enable;
828
829 outb(cable_fault_enable, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
830
831 mutex_unlock(&priv->lock);
832
833 return len;
834}
835
836static ssize_t quad8_signal_fck_prescaler_read(struct counter_device *counter,
837 struct counter_signal *signal, void *private, char *buf)
838{
839 const struct quad8 *const priv = counter->priv;
840 const size_t channel_id = signal->id / 2;
841
842 return sprintf(buf, "%u\n", priv->fck_prescaler[channel_id]);
843}
844
845static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
846 struct counter_signal *signal, void *private, const char *buf,
847 size_t len)
848{
849 struct quad8 *const priv = counter->priv;
850 const size_t channel_id = signal->id / 2;
851 const int base_offset = priv->base + 2 * channel_id;
852 u8 prescaler;
853 int ret;
854
855 ret = kstrtou8(buf, 0, &prescaler);
856 if (ret)
857 return ret;
858
859 mutex_lock(&priv->lock);
860
861 priv->fck_prescaler[channel_id] = prescaler;
862
863
864 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
865
866
867 outb(prescaler, base_offset);
868 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
869 base_offset + 1);
870
871 mutex_unlock(&priv->lock);
872
873 return len;
874}
875
876static const struct counter_signal_ext quad8_signal_ext[] = {
877 {
878 .name = "cable_fault",
879 .read = quad8_signal_cable_fault_read
880 },
881 {
882 .name = "cable_fault_enable",
883 .read = quad8_signal_cable_fault_enable_read,
884 .write = quad8_signal_cable_fault_enable_write
885 },
886 {
887 .name = "filter_clock_prescaler",
888 .read = quad8_signal_fck_prescaler_read,
889 .write = quad8_signal_fck_prescaler_write
890 }
891};
892
893static const struct counter_signal_ext quad8_index_ext[] = {
894 COUNTER_SIGNAL_ENUM("index_polarity", &quad8_index_pol_enum),
895 COUNTER_SIGNAL_ENUM_AVAILABLE("index_polarity", &quad8_index_pol_enum),
896 COUNTER_SIGNAL_ENUM("synchronous_mode", &quad8_syn_mode_enum),
897 COUNTER_SIGNAL_ENUM_AVAILABLE("synchronous_mode", &quad8_syn_mode_enum)
898};
899
900#define QUAD8_QUAD_SIGNAL(_id, _name) { \
901 .id = (_id), \
902 .name = (_name), \
903 .ext = quad8_signal_ext, \
904 .num_ext = ARRAY_SIZE(quad8_signal_ext) \
905}
906
907#define QUAD8_INDEX_SIGNAL(_id, _name) { \
908 .id = (_id), \
909 .name = (_name), \
910 .ext = quad8_index_ext, \
911 .num_ext = ARRAY_SIZE(quad8_index_ext) \
912}
913
914static struct counter_signal quad8_signals[] = {
915 QUAD8_QUAD_SIGNAL(0, "Channel 1 Quadrature A"),
916 QUAD8_QUAD_SIGNAL(1, "Channel 1 Quadrature B"),
917 QUAD8_QUAD_SIGNAL(2, "Channel 2 Quadrature A"),
918 QUAD8_QUAD_SIGNAL(3, "Channel 2 Quadrature B"),
919 QUAD8_QUAD_SIGNAL(4, "Channel 3 Quadrature A"),
920 QUAD8_QUAD_SIGNAL(5, "Channel 3 Quadrature B"),
921 QUAD8_QUAD_SIGNAL(6, "Channel 4 Quadrature A"),
922 QUAD8_QUAD_SIGNAL(7, "Channel 4 Quadrature B"),
923 QUAD8_QUAD_SIGNAL(8, "Channel 5 Quadrature A"),
924 QUAD8_QUAD_SIGNAL(9, "Channel 5 Quadrature B"),
925 QUAD8_QUAD_SIGNAL(10, "Channel 6 Quadrature A"),
926 QUAD8_QUAD_SIGNAL(11, "Channel 6 Quadrature B"),
927 QUAD8_QUAD_SIGNAL(12, "Channel 7 Quadrature A"),
928 QUAD8_QUAD_SIGNAL(13, "Channel 7 Quadrature B"),
929 QUAD8_QUAD_SIGNAL(14, "Channel 8 Quadrature A"),
930 QUAD8_QUAD_SIGNAL(15, "Channel 8 Quadrature B"),
931 QUAD8_INDEX_SIGNAL(16, "Channel 1 Index"),
932 QUAD8_INDEX_SIGNAL(17, "Channel 2 Index"),
933 QUAD8_INDEX_SIGNAL(18, "Channel 3 Index"),
934 QUAD8_INDEX_SIGNAL(19, "Channel 4 Index"),
935 QUAD8_INDEX_SIGNAL(20, "Channel 5 Index"),
936 QUAD8_INDEX_SIGNAL(21, "Channel 6 Index"),
937 QUAD8_INDEX_SIGNAL(22, "Channel 7 Index"),
938 QUAD8_INDEX_SIGNAL(23, "Channel 8 Index")
939};
940
941#define QUAD8_COUNT_SYNAPSES(_id) { \
942 { \
943 .actions_list = quad8_synapse_actions_list, \
944 .num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \
945 .signal = quad8_signals + 2 * (_id) \
946 }, \
947 { \
948 .actions_list = quad8_synapse_actions_list, \
949 .num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \
950 .signal = quad8_signals + 2 * (_id) + 1 \
951 }, \
952 { \
953 .actions_list = quad8_index_actions_list, \
954 .num_actions = ARRAY_SIZE(quad8_index_actions_list), \
955 .signal = quad8_signals + 2 * (_id) + 16 \
956 } \
957}
958
959static struct counter_synapse quad8_count_synapses[][3] = {
960 QUAD8_COUNT_SYNAPSES(0), QUAD8_COUNT_SYNAPSES(1),
961 QUAD8_COUNT_SYNAPSES(2), QUAD8_COUNT_SYNAPSES(3),
962 QUAD8_COUNT_SYNAPSES(4), QUAD8_COUNT_SYNAPSES(5),
963 QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7)
964};
965
966static const struct counter_count_ext quad8_count_ext[] = {
967 {
968 .name = "ceiling",
969 .read = quad8_count_ceiling_read,
970 .write = quad8_count_ceiling_write
971 },
972 {
973 .name = "floor",
974 .read = quad8_count_floor_read
975 },
976 COUNTER_COUNT_ENUM("count_mode", &quad8_cnt_mode_enum),
977 COUNTER_COUNT_ENUM_AVAILABLE("count_mode", &quad8_cnt_mode_enum),
978 {
979 .name = "direction",
980 .read = quad8_count_direction_read
981 },
982 {
983 .name = "enable",
984 .read = quad8_count_enable_read,
985 .write = quad8_count_enable_write
986 },
987 COUNTER_COUNT_ENUM("error_noise", &quad8_error_noise_enum),
988 COUNTER_COUNT_ENUM_AVAILABLE("error_noise", &quad8_error_noise_enum),
989 {
990 .name = "preset",
991 .read = quad8_count_preset_read,
992 .write = quad8_count_preset_write
993 },
994 {
995 .name = "preset_enable",
996 .read = quad8_count_preset_enable_read,
997 .write = quad8_count_preset_enable_write
998 }
999};
1000
1001#define QUAD8_COUNT(_id, _cntname) { \
1002 .id = (_id), \
1003 .name = (_cntname), \
1004 .functions_list = quad8_count_functions_list, \
1005 .num_functions = ARRAY_SIZE(quad8_count_functions_list), \
1006 .synapses = quad8_count_synapses[(_id)], \
1007 .num_synapses = 2, \
1008 .ext = quad8_count_ext, \
1009 .num_ext = ARRAY_SIZE(quad8_count_ext) \
1010}
1011
1012static struct counter_count quad8_counts[] = {
1013 QUAD8_COUNT(0, "Channel 1 Count"),
1014 QUAD8_COUNT(1, "Channel 2 Count"),
1015 QUAD8_COUNT(2, "Channel 3 Count"),
1016 QUAD8_COUNT(3, "Channel 4 Count"),
1017 QUAD8_COUNT(4, "Channel 5 Count"),
1018 QUAD8_COUNT(5, "Channel 6 Count"),
1019 QUAD8_COUNT(6, "Channel 7 Count"),
1020 QUAD8_COUNT(7, "Channel 8 Count")
1021};
1022
1023static int quad8_probe(struct device *dev, unsigned int id)
1024{
1025 struct quad8 *priv;
1026 int i, j;
1027 unsigned int base_offset;
1028
1029 if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) {
1030 dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
1031 base[id], base[id] + QUAD8_EXTENT);
1032 return -EBUSY;
1033 }
1034
1035 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
1036 if (!priv)
1037 return -ENOMEM;
1038
1039
1040 priv->counter.name = dev_name(dev);
1041 priv->counter.parent = dev;
1042 priv->counter.ops = &quad8_ops;
1043 priv->counter.counts = quad8_counts;
1044 priv->counter.num_counts = ARRAY_SIZE(quad8_counts);
1045 priv->counter.signals = quad8_signals;
1046 priv->counter.num_signals = ARRAY_SIZE(quad8_signals);
1047 priv->counter.priv = priv;
1048 priv->base = base[id];
1049
1050
1051 mutex_init(&priv->lock);
1052
1053
1054 outb(QUAD8_CHAN_OP_RESET_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);
1055
1056 for (i = 0; i < QUAD8_NUM_COUNTERS; i++) {
1057 base_offset = base[id] + 2 * i;
1058
1059 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
1060
1061 outb(0, base_offset);
1062 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
1063 base_offset + 1);
1064
1065 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
1066
1067 for (j = 0; j < 3; j++)
1068 outb(0x00, base_offset);
1069
1070 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1);
1071
1072 outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
1073
1074 outb(QUAD8_CTR_CMR, base_offset + 1);
1075
1076 outb(QUAD8_CTR_IOR, base_offset + 1);
1077
1078 outb(QUAD8_CTR_IDR, base_offset + 1);
1079 }
1080
1081 outb(0xFF, base[id] + QUAD8_DIFF_ENCODER_CABLE_STATUS);
1082
1083 outb(QUAD8_CHAN_OP_ENABLE_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);
1084
1085 return devm_counter_register(dev, &priv->counter);
1086}
1087
1088static struct isa_driver quad8_driver = {
1089 .probe = quad8_probe,
1090 .driver = {
1091 .name = "104-quad-8"
1092 }
1093};
1094
1095module_isa_driver(quad8_driver, num_quad8);
1096
1097MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
1098MODULE_DESCRIPTION("ACCES 104-QUAD-8 driver");
1099MODULE_LICENSE("GPL v2");
1100