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14#include <linux/bitmap.h>
15#include <linux/delay.h>
16#include <linux/fs.h>
17#include <linux/irq.h>
18#include <linux/pm.h>
19#include <linux/slab.h>
20#include <linux/of.h>
21#include <linux/irqdomain.h>
22#include <uapi/linux/input.h>
23#include <linux/rmi.h>
24#include "rmi_bus.h"
25#include "rmi_driver.h"
26
27#define HAS_NONSTANDARD_PDT_MASK 0x40
28#define RMI4_MAX_PAGE 0xff
29#define RMI4_PAGE_SIZE 0x100
30#define RMI4_PAGE_MASK 0xFF00
31
32#define RMI_DEVICE_RESET_CMD 0x01
33#define DEFAULT_RESET_DELAY_MS 100
34
35void rmi_free_function_list(struct rmi_device *rmi_dev)
36{
37 struct rmi_function *fn, *tmp;
38 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
39
40 rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n");
41
42
43 list_for_each_entry_safe_reverse(fn, tmp,
44 &data->function_list, node) {
45 list_del(&fn->node);
46 rmi_unregister_function(fn);
47 }
48
49 devm_kfree(&rmi_dev->dev, data->irq_memory);
50 data->irq_memory = NULL;
51 data->irq_status = NULL;
52 data->fn_irq_bits = NULL;
53 data->current_irq_mask = NULL;
54 data->new_irq_mask = NULL;
55
56 data->f01_container = NULL;
57 data->f34_container = NULL;
58}
59
60static int reset_one_function(struct rmi_function *fn)
61{
62 struct rmi_function_handler *fh;
63 int retval = 0;
64
65 if (!fn || !fn->dev.driver)
66 return 0;
67
68 fh = to_rmi_function_handler(fn->dev.driver);
69 if (fh->reset) {
70 retval = fh->reset(fn);
71 if (retval < 0)
72 dev_err(&fn->dev, "Reset failed with code %d.\n",
73 retval);
74 }
75
76 return retval;
77}
78
79static int configure_one_function(struct rmi_function *fn)
80{
81 struct rmi_function_handler *fh;
82 int retval = 0;
83
84 if (!fn || !fn->dev.driver)
85 return 0;
86
87 fh = to_rmi_function_handler(fn->dev.driver);
88 if (fh->config) {
89 retval = fh->config(fn);
90 if (retval < 0)
91 dev_err(&fn->dev, "Config failed with code %d.\n",
92 retval);
93 }
94
95 return retval;
96}
97
98static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev)
99{
100 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
101 struct rmi_function *entry;
102 int retval;
103
104 list_for_each_entry(entry, &data->function_list, node) {
105 retval = reset_one_function(entry);
106 if (retval < 0)
107 return retval;
108 }
109
110 return 0;
111}
112
113static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev)
114{
115 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
116 struct rmi_function *entry;
117 int retval;
118
119 list_for_each_entry(entry, &data->function_list, node) {
120 retval = configure_one_function(entry);
121 if (retval < 0)
122 return retval;
123 }
124
125 return 0;
126}
127
128static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
129{
130 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
131 struct device *dev = &rmi_dev->dev;
132 int i;
133 int error;
134
135 if (!data)
136 return 0;
137
138 if (!data->attn_data.data) {
139 error = rmi_read_block(rmi_dev,
140 data->f01_container->fd.data_base_addr + 1,
141 data->irq_status, data->num_of_irq_regs);
142 if (error < 0) {
143 dev_err(dev, "Failed to read irqs, code=%d\n", error);
144 return error;
145 }
146 }
147
148 mutex_lock(&data->irq_mutex);
149 bitmap_and(data->irq_status, data->irq_status, data->current_irq_mask,
150 data->irq_count);
151
152
153
154
155 mutex_unlock(&data->irq_mutex);
156
157 for_each_set_bit(i, data->irq_status, data->irq_count)
158 handle_nested_irq(irq_find_mapping(data->irqdomain, i));
159
160 if (data->input)
161 input_sync(data->input);
162
163 return 0;
164}
165
166void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
167 void *data, size_t size)
168{
169 struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
170 struct rmi4_attn_data attn_data;
171 void *fifo_data;
172
173 if (!drvdata->enabled)
174 return;
175
176 fifo_data = kmemdup(data, size, GFP_ATOMIC);
177 if (!fifo_data)
178 return;
179
180 attn_data.irq_status = irq_status;
181 attn_data.size = size;
182 attn_data.data = fifo_data;
183
184 kfifo_put(&drvdata->attn_fifo, attn_data);
185}
186EXPORT_SYMBOL_GPL(rmi_set_attn_data);
187
188static irqreturn_t rmi_irq_fn(int irq, void *dev_id)
189{
190 struct rmi_device *rmi_dev = dev_id;
191 struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
192 struct rmi4_attn_data attn_data = {0};
193 int ret, count;
194
195 count = kfifo_get(&drvdata->attn_fifo, &attn_data);
196 if (count) {
197 *(drvdata->irq_status) = attn_data.irq_status;
198 drvdata->attn_data = attn_data;
199 }
200
201 ret = rmi_process_interrupt_requests(rmi_dev);
202 if (ret)
203 rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev,
204 "Failed to process interrupt request: %d\n", ret);
205
206 if (count) {
207 kfree(attn_data.data);
208 attn_data.data = NULL;
209 }
210
211 if (!kfifo_is_empty(&drvdata->attn_fifo))
212 return rmi_irq_fn(irq, dev_id);
213
214 return IRQ_HANDLED;
215}
216
217static int rmi_irq_init(struct rmi_device *rmi_dev)
218{
219 struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
220 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
221 int irq_flags = irq_get_trigger_type(pdata->irq);
222 int ret;
223
224 if (!irq_flags)
225 irq_flags = IRQF_TRIGGER_LOW;
226
227 ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL,
228 rmi_irq_fn, irq_flags | IRQF_ONESHOT,
229 dev_driver_string(rmi_dev->xport->dev),
230 rmi_dev);
231 if (ret < 0) {
232 dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n",
233 pdata->irq);
234
235 return ret;
236 }
237
238 data->enabled = true;
239
240 return 0;
241}
242
243struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number)
244{
245 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
246 struct rmi_function *entry;
247
248 list_for_each_entry(entry, &data->function_list, node) {
249 if (entry->fd.function_number == number)
250 return entry;
251 }
252
253 return NULL;
254}
255
256static int suspend_one_function(struct rmi_function *fn)
257{
258 struct rmi_function_handler *fh;
259 int retval = 0;
260
261 if (!fn || !fn->dev.driver)
262 return 0;
263
264 fh = to_rmi_function_handler(fn->dev.driver);
265 if (fh->suspend) {
266 retval = fh->suspend(fn);
267 if (retval < 0)
268 dev_err(&fn->dev, "Suspend failed with code %d.\n",
269 retval);
270 }
271
272 return retval;
273}
274
275static int rmi_suspend_functions(struct rmi_device *rmi_dev)
276{
277 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
278 struct rmi_function *entry;
279 int retval;
280
281 list_for_each_entry(entry, &data->function_list, node) {
282 retval = suspend_one_function(entry);
283 if (retval < 0)
284 return retval;
285 }
286
287 return 0;
288}
289
290static int resume_one_function(struct rmi_function *fn)
291{
292 struct rmi_function_handler *fh;
293 int retval = 0;
294
295 if (!fn || !fn->dev.driver)
296 return 0;
297
298 fh = to_rmi_function_handler(fn->dev.driver);
299 if (fh->resume) {
300 retval = fh->resume(fn);
301 if (retval < 0)
302 dev_err(&fn->dev, "Resume failed with code %d.\n",
303 retval);
304 }
305
306 return retval;
307}
308
309static int rmi_resume_functions(struct rmi_device *rmi_dev)
310{
311 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
312 struct rmi_function *entry;
313 int retval;
314
315 list_for_each_entry(entry, &data->function_list, node) {
316 retval = resume_one_function(entry);
317 if (retval < 0)
318 return retval;
319 }
320
321 return 0;
322}
323
324int rmi_enable_sensor(struct rmi_device *rmi_dev)
325{
326 int retval = 0;
327
328 retval = rmi_driver_process_config_requests(rmi_dev);
329 if (retval < 0)
330 return retval;
331
332 return rmi_process_interrupt_requests(rmi_dev);
333}
334
335
336
337
338
339
340
341
342static int rmi_driver_set_input_params(struct rmi_device *rmi_dev,
343 struct input_dev *input)
344{
345 input->name = SYNAPTICS_INPUT_DEVICE_NAME;
346 input->id.vendor = SYNAPTICS_VENDOR_ID;
347 input->id.bustype = BUS_RMI;
348 return 0;
349}
350
351static void rmi_driver_set_input_name(struct rmi_device *rmi_dev,
352 struct input_dev *input)
353{
354 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
355 const char *device_name = rmi_f01_get_product_ID(data->f01_container);
356 char *name;
357
358 name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL,
359 "Synaptics %s", device_name);
360 if (!name)
361 return;
362
363 input->name = name;
364}
365
366static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev,
367 unsigned long *mask)
368{
369 int error = 0;
370 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
371 struct device *dev = &rmi_dev->dev;
372
373 mutex_lock(&data->irq_mutex);
374 bitmap_or(data->new_irq_mask,
375 data->current_irq_mask, mask, data->irq_count);
376
377 error = rmi_write_block(rmi_dev,
378 data->f01_container->fd.control_base_addr + 1,
379 data->new_irq_mask, data->num_of_irq_regs);
380 if (error < 0) {
381 dev_err(dev, "%s: Failed to change enabled interrupts!",
382 __func__);
383 goto error_unlock;
384 }
385 bitmap_copy(data->current_irq_mask, data->new_irq_mask,
386 data->num_of_irq_regs);
387
388error_unlock:
389 mutex_unlock(&data->irq_mutex);
390 return error;
391}
392
393static int rmi_driver_clear_irq_bits(struct rmi_device *rmi_dev,
394 unsigned long *mask)
395{
396 int error = 0;
397 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
398 struct device *dev = &rmi_dev->dev;
399
400 mutex_lock(&data->irq_mutex);
401 bitmap_andnot(data->new_irq_mask,
402 data->current_irq_mask, mask, data->irq_count);
403
404 error = rmi_write_block(rmi_dev,
405 data->f01_container->fd.control_base_addr + 1,
406 data->new_irq_mask, data->num_of_irq_regs);
407 if (error < 0) {
408 dev_err(dev, "%s: Failed to change enabled interrupts!",
409 __func__);
410 goto error_unlock;
411 }
412 bitmap_copy(data->current_irq_mask, data->new_irq_mask,
413 data->num_of_irq_regs);
414
415error_unlock:
416 mutex_unlock(&data->irq_mutex);
417 return error;
418}
419
420static int rmi_driver_reset_handler(struct rmi_device *rmi_dev)
421{
422 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
423 int error;
424
425
426
427
428
429 if (!data || !data->f01_container) {
430 dev_warn(&rmi_dev->dev,
431 "Not ready to handle reset yet!\n");
432 return 0;
433 }
434
435 error = rmi_read_block(rmi_dev,
436 data->f01_container->fd.control_base_addr + 1,
437 data->current_irq_mask, data->num_of_irq_regs);
438 if (error < 0) {
439 dev_err(&rmi_dev->dev, "%s: Failed to read current IRQ mask.\n",
440 __func__);
441 return error;
442 }
443
444 error = rmi_driver_process_reset_requests(rmi_dev);
445 if (error < 0)
446 return error;
447
448 error = rmi_driver_process_config_requests(rmi_dev);
449 if (error < 0)
450 return error;
451
452 return 0;
453}
454
455static int rmi_read_pdt_entry(struct rmi_device *rmi_dev,
456 struct pdt_entry *entry, u16 pdt_address)
457{
458 u8 buf[RMI_PDT_ENTRY_SIZE];
459 int error;
460
461 error = rmi_read_block(rmi_dev, pdt_address, buf, RMI_PDT_ENTRY_SIZE);
462 if (error) {
463 dev_err(&rmi_dev->dev, "Read PDT entry at %#06x failed, code: %d.\n",
464 pdt_address, error);
465 return error;
466 }
467
468 entry->page_start = pdt_address & RMI4_PAGE_MASK;
469 entry->query_base_addr = buf[0];
470 entry->command_base_addr = buf[1];
471 entry->control_base_addr = buf[2];
472 entry->data_base_addr = buf[3];
473 entry->interrupt_source_count = buf[4] & RMI_PDT_INT_SOURCE_COUNT_MASK;
474 entry->function_version = (buf[4] & RMI_PDT_FUNCTION_VERSION_MASK) >> 5;
475 entry->function_number = buf[5];
476
477 return 0;
478}
479
480static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt,
481 struct rmi_function_descriptor *fd)
482{
483 fd->query_base_addr = pdt->query_base_addr + pdt->page_start;
484 fd->command_base_addr = pdt->command_base_addr + pdt->page_start;
485 fd->control_base_addr = pdt->control_base_addr + pdt->page_start;
486 fd->data_base_addr = pdt->data_base_addr + pdt->page_start;
487 fd->function_number = pdt->function_number;
488 fd->interrupt_source_count = pdt->interrupt_source_count;
489 fd->function_version = pdt->function_version;
490}
491
492#define RMI_SCAN_CONTINUE 0
493#define RMI_SCAN_DONE 1
494
495static int rmi_scan_pdt_page(struct rmi_device *rmi_dev,
496 int page,
497 int *empty_pages,
498 void *ctx,
499 int (*callback)(struct rmi_device *rmi_dev,
500 void *ctx,
501 const struct pdt_entry *entry))
502{
503 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
504 struct pdt_entry pdt_entry;
505 u16 page_start = RMI4_PAGE_SIZE * page;
506 u16 pdt_start = page_start + PDT_START_SCAN_LOCATION;
507 u16 pdt_end = page_start + PDT_END_SCAN_LOCATION;
508 u16 addr;
509 int error;
510 int retval;
511
512 for (addr = pdt_start; addr >= pdt_end; addr -= RMI_PDT_ENTRY_SIZE) {
513 error = rmi_read_pdt_entry(rmi_dev, &pdt_entry, addr);
514 if (error)
515 return error;
516
517 if (RMI4_END_OF_PDT(pdt_entry.function_number))
518 break;
519
520 retval = callback(rmi_dev, ctx, &pdt_entry);
521 if (retval != RMI_SCAN_CONTINUE)
522 return retval;
523 }
524
525
526
527
528
529 if (addr == pdt_start)
530 ++*empty_pages;
531 else
532 *empty_pages = 0;
533
534 return (data->bootloader_mode || *empty_pages >= 2) ?
535 RMI_SCAN_DONE : RMI_SCAN_CONTINUE;
536}
537
538int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx,
539 int (*callback)(struct rmi_device *rmi_dev,
540 void *ctx, const struct pdt_entry *entry))
541{
542 int page;
543 int empty_pages = 0;
544 int retval = RMI_SCAN_DONE;
545
546 for (page = 0; page <= RMI4_MAX_PAGE; page++) {
547 retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages,
548 ctx, callback);
549 if (retval != RMI_SCAN_CONTINUE)
550 break;
551 }
552
553 return retval < 0 ? retval : 0;
554}
555
556int rmi_read_register_desc(struct rmi_device *d, u16 addr,
557 struct rmi_register_descriptor *rdesc)
558{
559 int ret;
560 u8 size_presence_reg;
561 u8 buf[35];
562 int presense_offset = 1;
563 u8 *struct_buf;
564 int reg;
565 int offset = 0;
566 int map_offset = 0;
567 int i;
568 int b;
569
570
571
572
573
574 ret = rmi_read(d, addr, &size_presence_reg);
575 if (ret)
576 return ret;
577 ++addr;
578
579 if (size_presence_reg < 0 || size_presence_reg > 35)
580 return -EIO;
581
582 memset(buf, 0, sizeof(buf));
583
584
585
586
587
588
589 ret = rmi_read_block(d, addr, buf, size_presence_reg);
590 if (ret)
591 return ret;
592 ++addr;
593
594 if (buf[0] == 0) {
595 presense_offset = 3;
596 rdesc->struct_size = buf[1] | (buf[2] << 8);
597 } else {
598 rdesc->struct_size = buf[0];
599 }
600
601 for (i = presense_offset; i < size_presence_reg; i++) {
602 for (b = 0; b < 8; b++) {
603 if (buf[i] & (0x1 << b))
604 bitmap_set(rdesc->presense_map, map_offset, 1);
605 ++map_offset;
606 }
607 }
608
609 rdesc->num_registers = bitmap_weight(rdesc->presense_map,
610 RMI_REG_DESC_PRESENSE_BITS);
611
612 rdesc->registers = devm_kcalloc(&d->dev,
613 rdesc->num_registers,
614 sizeof(struct rmi_register_desc_item),
615 GFP_KERNEL);
616 if (!rdesc->registers)
617 return -ENOMEM;
618
619
620
621
622
623
624 struct_buf = kzalloc(rdesc->struct_size, GFP_KERNEL);
625 if (!struct_buf)
626 return -ENOMEM;
627
628
629
630
631
632
633
634 ret = rmi_read_block(d, addr, struct_buf, rdesc->struct_size);
635 if (ret)
636 goto free_struct_buff;
637
638 reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS);
639 for (i = 0; i < rdesc->num_registers; i++) {
640 struct rmi_register_desc_item *item = &rdesc->registers[i];
641 int reg_size = struct_buf[offset];
642
643 ++offset;
644 if (reg_size == 0) {
645 reg_size = struct_buf[offset] |
646 (struct_buf[offset + 1] << 8);
647 offset += 2;
648 }
649
650 if (reg_size == 0) {
651 reg_size = struct_buf[offset] |
652 (struct_buf[offset + 1] << 8) |
653 (struct_buf[offset + 2] << 16) |
654 (struct_buf[offset + 3] << 24);
655 offset += 4;
656 }
657
658 item->reg = reg;
659 item->reg_size = reg_size;
660
661 map_offset = 0;
662
663 do {
664 for (b = 0; b < 7; b++) {
665 if (struct_buf[offset] & (0x1 << b))
666 bitmap_set(item->subpacket_map,
667 map_offset, 1);
668 ++map_offset;
669 }
670 } while (struct_buf[offset++] & 0x80);
671
672 item->num_subpackets = bitmap_weight(item->subpacket_map,
673 RMI_REG_DESC_SUBPACKET_BITS);
674
675 rmi_dbg(RMI_DEBUG_CORE, &d->dev,
676 "%s: reg: %d reg size: %ld subpackets: %d\n", __func__,
677 item->reg, item->reg_size, item->num_subpackets);
678
679 reg = find_next_bit(rdesc->presense_map,
680 RMI_REG_DESC_PRESENSE_BITS, reg + 1);
681 }
682
683free_struct_buff:
684 kfree(struct_buf);
685 return ret;
686}
687
688const struct rmi_register_desc_item *rmi_get_register_desc_item(
689 struct rmi_register_descriptor *rdesc, u16 reg)
690{
691 const struct rmi_register_desc_item *item;
692 int i;
693
694 for (i = 0; i < rdesc->num_registers; i++) {
695 item = &rdesc->registers[i];
696 if (item->reg == reg)
697 return item;
698 }
699
700 return NULL;
701}
702
703size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc)
704{
705 const struct rmi_register_desc_item *item;
706 int i;
707 size_t size = 0;
708
709 for (i = 0; i < rdesc->num_registers; i++) {
710 item = &rdesc->registers[i];
711 size += item->reg_size;
712 }
713 return size;
714}
715
716
717int rmi_register_desc_calc_reg_offset(
718 struct rmi_register_descriptor *rdesc, u16 reg)
719{
720 const struct rmi_register_desc_item *item;
721 int offset = 0;
722 int i;
723
724 for (i = 0; i < rdesc->num_registers; i++) {
725 item = &rdesc->registers[i];
726 if (item->reg == reg)
727 return offset;
728 ++offset;
729 }
730 return -1;
731}
732
733bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item,
734 u8 subpacket)
735{
736 return find_next_bit(item->subpacket_map, RMI_REG_DESC_PRESENSE_BITS,
737 subpacket) == subpacket;
738}
739
740static int rmi_check_bootloader_mode(struct rmi_device *rmi_dev,
741 const struct pdt_entry *pdt)
742{
743 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
744 int ret;
745 u8 status;
746
747 if (pdt->function_number == 0x34 && pdt->function_version > 1) {
748 ret = rmi_read(rmi_dev, pdt->data_base_addr, &status);
749 if (ret) {
750 dev_err(&rmi_dev->dev,
751 "Failed to read F34 status: %d.\n", ret);
752 return ret;
753 }
754
755 if (status & BIT(7))
756 data->bootloader_mode = true;
757 } else if (pdt->function_number == 0x01) {
758 ret = rmi_read(rmi_dev, pdt->data_base_addr, &status);
759 if (ret) {
760 dev_err(&rmi_dev->dev,
761 "Failed to read F01 status: %d.\n", ret);
762 return ret;
763 }
764
765 if (status & BIT(6))
766 data->bootloader_mode = true;
767 }
768
769 return 0;
770}
771
772static int rmi_count_irqs(struct rmi_device *rmi_dev,
773 void *ctx, const struct pdt_entry *pdt)
774{
775 int *irq_count = ctx;
776 int ret;
777
778 *irq_count += pdt->interrupt_source_count;
779
780 ret = rmi_check_bootloader_mode(rmi_dev, pdt);
781 if (ret < 0)
782 return ret;
783
784 return RMI_SCAN_CONTINUE;
785}
786
787int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx,
788 const struct pdt_entry *pdt)
789{
790 int error;
791
792 if (pdt->function_number == 0x01) {
793 u16 cmd_addr = pdt->page_start + pdt->command_base_addr;
794 u8 cmd_buf = RMI_DEVICE_RESET_CMD;
795 const struct rmi_device_platform_data *pdata =
796 rmi_get_platform_data(rmi_dev);
797
798 if (rmi_dev->xport->ops->reset) {
799 error = rmi_dev->xport->ops->reset(rmi_dev->xport,
800 cmd_addr);
801 if (error)
802 return error;
803
804 return RMI_SCAN_DONE;
805 }
806
807 rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Sending reset\n");
808 error = rmi_write_block(rmi_dev, cmd_addr, &cmd_buf, 1);
809 if (error) {
810 dev_err(&rmi_dev->dev,
811 "Initial reset failed. Code = %d.\n", error);
812 return error;
813 }
814
815 mdelay(pdata->reset_delay_ms ?: DEFAULT_RESET_DELAY_MS);
816
817 return RMI_SCAN_DONE;
818 }
819
820
821 return pdt->page_start == 0 ? RMI_SCAN_CONTINUE : -ENODEV;
822}
823
824static int rmi_create_function(struct rmi_device *rmi_dev,
825 void *ctx, const struct pdt_entry *pdt)
826{
827 struct device *dev = &rmi_dev->dev;
828 struct rmi_driver_data *data = dev_get_drvdata(dev);
829 int *current_irq_count = ctx;
830 struct rmi_function *fn;
831 int i;
832 int error;
833
834 rmi_dbg(RMI_DEBUG_CORE, dev, "Initializing F%02X.\n",
835 pdt->function_number);
836
837 fn = kzalloc(sizeof(struct rmi_function) +
838 BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long),
839 GFP_KERNEL);
840 if (!fn) {
841 dev_err(dev, "Failed to allocate memory for F%02X\n",
842 pdt->function_number);
843 return -ENOMEM;
844 }
845
846 INIT_LIST_HEAD(&fn->node);
847 rmi_driver_copy_pdt_to_fd(pdt, &fn->fd);
848
849 fn->rmi_dev = rmi_dev;
850
851 fn->num_of_irqs = pdt->interrupt_source_count;
852 fn->irq_pos = *current_irq_count;
853 *current_irq_count += fn->num_of_irqs;
854
855 for (i = 0; i < fn->num_of_irqs; i++)
856 set_bit(fn->irq_pos + i, fn->irq_mask);
857
858 error = rmi_register_function(fn);
859 if (error)
860 return error;
861
862 if (pdt->function_number == 0x01)
863 data->f01_container = fn;
864 else if (pdt->function_number == 0x34)
865 data->f34_container = fn;
866
867 list_add_tail(&fn->node, &data->function_list);
868
869 return RMI_SCAN_CONTINUE;
870}
871
872void rmi_enable_irq(struct rmi_device *rmi_dev, bool clear_wake)
873{
874 struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
875 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
876 int irq = pdata->irq;
877 int irq_flags;
878 int retval;
879
880 mutex_lock(&data->enabled_mutex);
881
882 if (data->enabled)
883 goto out;
884
885 enable_irq(irq);
886 data->enabled = true;
887 if (clear_wake && device_may_wakeup(rmi_dev->xport->dev)) {
888 retval = disable_irq_wake(irq);
889 if (retval)
890 dev_warn(&rmi_dev->dev,
891 "Failed to disable irq for wake: %d\n",
892 retval);
893 }
894
895
896
897
898
899 irq_flags = irq_get_trigger_type(pdata->irq);
900 if (irq_flags & IRQ_TYPE_EDGE_BOTH)
901 rmi_process_interrupt_requests(rmi_dev);
902
903out:
904 mutex_unlock(&data->enabled_mutex);
905}
906
907void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake)
908{
909 struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
910 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
911 struct rmi4_attn_data attn_data = {0};
912 int irq = pdata->irq;
913 int retval, count;
914
915 mutex_lock(&data->enabled_mutex);
916
917 if (!data->enabled)
918 goto out;
919
920 data->enabled = false;
921 disable_irq(irq);
922 if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) {
923 retval = enable_irq_wake(irq);
924 if (retval)
925 dev_warn(&rmi_dev->dev,
926 "Failed to enable irq for wake: %d\n",
927 retval);
928 }
929
930
931 while (!kfifo_is_empty(&data->attn_fifo)) {
932 count = kfifo_get(&data->attn_fifo, &attn_data);
933 if (count)
934 kfree(attn_data.data);
935 }
936
937out:
938 mutex_unlock(&data->enabled_mutex);
939}
940
941int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake)
942{
943 int retval;
944
945 retval = rmi_suspend_functions(rmi_dev);
946 if (retval)
947 dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n",
948 retval);
949
950 rmi_disable_irq(rmi_dev, enable_wake);
951 return retval;
952}
953EXPORT_SYMBOL_GPL(rmi_driver_suspend);
954
955int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake)
956{
957 int retval;
958
959 rmi_enable_irq(rmi_dev, clear_wake);
960
961 retval = rmi_resume_functions(rmi_dev);
962 if (retval)
963 dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n",
964 retval);
965
966 return retval;
967}
968EXPORT_SYMBOL_GPL(rmi_driver_resume);
969
970static int rmi_driver_remove(struct device *dev)
971{
972 struct rmi_device *rmi_dev = to_rmi_device(dev);
973 struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
974
975 rmi_disable_irq(rmi_dev, false);
976
977 irq_domain_remove(data->irqdomain);
978 data->irqdomain = NULL;
979
980 rmi_f34_remove_sysfs(rmi_dev);
981 rmi_free_function_list(rmi_dev);
982
983 return 0;
984}
985
986#ifdef CONFIG_OF
987static int rmi_driver_of_probe(struct device *dev,
988 struct rmi_device_platform_data *pdata)
989{
990 int retval;
991
992 retval = rmi_of_property_read_u32(dev, &pdata->reset_delay_ms,
993 "syna,reset-delay-ms", 1);
994 if (retval)
995 return retval;
996
997 return 0;
998}
999#else
1000static inline int rmi_driver_of_probe(struct device *dev,
1001 struct rmi_device_platform_data *pdata)
1002{
1003 return -ENODEV;
1004}
1005#endif
1006
1007int rmi_probe_interrupts(struct rmi_driver_data *data)
1008{
1009 struct rmi_device *rmi_dev = data->rmi_dev;
1010 struct device *dev = &rmi_dev->dev;
1011 struct fwnode_handle *fwnode = rmi_dev->xport->dev->fwnode;
1012 int irq_count = 0;
1013 size_t size;
1014 int retval;
1015
1016
1017
1018
1019
1020
1021
1022 rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Counting IRQs.\n", __func__);
1023 data->bootloader_mode = false;
1024
1025 retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_count_irqs);
1026 if (retval < 0) {
1027 dev_err(dev, "IRQ counting failed with code %d.\n", retval);
1028 return retval;
1029 }
1030
1031 if (data->bootloader_mode)
1032 dev_warn(dev, "Device in bootloader mode.\n");
1033
1034
1035 data->irqdomain = irq_domain_create_linear(fwnode, irq_count,
1036 &irq_domain_simple_ops,
1037 data);
1038 if (!data->irqdomain) {
1039 dev_err(&rmi_dev->dev, "Failed to create IRQ domain\n");
1040 return -ENOMEM;
1041 }
1042
1043 data->irq_count = irq_count;
1044 data->num_of_irq_regs = (data->irq_count + 7) / 8;
1045
1046 size = BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long);
1047 data->irq_memory = devm_kcalloc(dev, size, 4, GFP_KERNEL);
1048 if (!data->irq_memory) {
1049 dev_err(dev, "Failed to allocate memory for irq masks.\n");
1050 return -ENOMEM;
1051 }
1052
1053 data->irq_status = data->irq_memory + size * 0;
1054 data->fn_irq_bits = data->irq_memory + size * 1;
1055 data->current_irq_mask = data->irq_memory + size * 2;
1056 data->new_irq_mask = data->irq_memory + size * 3;
1057
1058 return retval;
1059}
1060
1061int rmi_init_functions(struct rmi_driver_data *data)
1062{
1063 struct rmi_device *rmi_dev = data->rmi_dev;
1064 struct device *dev = &rmi_dev->dev;
1065 int irq_count = 0;
1066 int retval;
1067
1068 rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Creating functions.\n", __func__);
1069 retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_create_function);
1070 if (retval < 0) {
1071 dev_err(dev, "Function creation failed with code %d.\n",
1072 retval);
1073 goto err_destroy_functions;
1074 }
1075
1076 if (!data->f01_container) {
1077 dev_err(dev, "Missing F01 container!\n");
1078 retval = -EINVAL;
1079 goto err_destroy_functions;
1080 }
1081
1082 retval = rmi_read_block(rmi_dev,
1083 data->f01_container->fd.control_base_addr + 1,
1084 data->current_irq_mask, data->num_of_irq_regs);
1085 if (retval < 0) {
1086 dev_err(dev, "%s: Failed to read current IRQ mask.\n",
1087 __func__);
1088 goto err_destroy_functions;
1089 }
1090
1091 return 0;
1092
1093err_destroy_functions:
1094 rmi_free_function_list(rmi_dev);
1095 return retval;
1096}
1097
1098static int rmi_driver_probe(struct device *dev)
1099{
1100 struct rmi_driver *rmi_driver;
1101 struct rmi_driver_data *data;
1102 struct rmi_device_platform_data *pdata;
1103 struct rmi_device *rmi_dev;
1104 int retval;
1105
1106 rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Starting probe.\n",
1107 __func__);
1108
1109 if (!rmi_is_physical_device(dev)) {
1110 rmi_dbg(RMI_DEBUG_CORE, dev, "Not a physical device.\n");
1111 return -ENODEV;
1112 }
1113
1114 rmi_dev = to_rmi_device(dev);
1115 rmi_driver = to_rmi_driver(dev->driver);
1116 rmi_dev->driver = rmi_driver;
1117
1118 pdata = rmi_get_platform_data(rmi_dev);
1119
1120 if (rmi_dev->xport->dev->of_node) {
1121 retval = rmi_driver_of_probe(rmi_dev->xport->dev, pdata);
1122 if (retval)
1123 return retval;
1124 }
1125
1126 data = devm_kzalloc(dev, sizeof(struct rmi_driver_data), GFP_KERNEL);
1127 if (!data)
1128 return -ENOMEM;
1129
1130 INIT_LIST_HEAD(&data->function_list);
1131 data->rmi_dev = rmi_dev;
1132 dev_set_drvdata(&rmi_dev->dev, data);
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155 retval = rmi_scan_pdt(rmi_dev, NULL, rmi_initial_reset);
1156 if (retval < 0)
1157 dev_warn(dev, "RMI initial reset failed! Continuing in spite of this.\n");
1158
1159 retval = rmi_read(rmi_dev, PDT_PROPERTIES_LOCATION, &data->pdt_props);
1160 if (retval < 0) {
1161
1162
1163
1164
1165 dev_warn(dev, "Could not read PDT properties from %#06x (code %d). Assuming 0x00.\n",
1166 PDT_PROPERTIES_LOCATION, retval);
1167 }
1168
1169 mutex_init(&data->irq_mutex);
1170 mutex_init(&data->enabled_mutex);
1171
1172 retval = rmi_probe_interrupts(data);
1173 if (retval)
1174 goto err;
1175
1176 if (rmi_dev->xport->input) {
1177
1178
1179
1180
1181
1182
1183
1184 data->input = rmi_dev->xport->input;
1185 } else {
1186 data->input = devm_input_allocate_device(dev);
1187 if (!data->input) {
1188 dev_err(dev, "%s: Failed to allocate input device.\n",
1189 __func__);
1190 retval = -ENOMEM;
1191 goto err;
1192 }
1193 rmi_driver_set_input_params(rmi_dev, data->input);
1194 data->input->phys = devm_kasprintf(dev, GFP_KERNEL,
1195 "%s/input0", dev_name(dev));
1196 }
1197
1198 retval = rmi_init_functions(data);
1199 if (retval)
1200 goto err;
1201
1202 retval = rmi_f34_create_sysfs(rmi_dev);
1203 if (retval)
1204 goto err;
1205
1206 if (data->input) {
1207 rmi_driver_set_input_name(rmi_dev, data->input);
1208 if (!rmi_dev->xport->input) {
1209 if (input_register_device(data->input)) {
1210 dev_err(dev, "%s: Failed to register input device.\n",
1211 __func__);
1212 goto err_destroy_functions;
1213 }
1214 }
1215 }
1216
1217 retval = rmi_irq_init(rmi_dev);
1218 if (retval < 0)
1219 goto err_destroy_functions;
1220
1221 if (data->f01_container->dev.driver) {
1222
1223 retval = rmi_enable_sensor(rmi_dev);
1224 if (retval)
1225 goto err_disable_irq;
1226 }
1227
1228 return 0;
1229
1230err_disable_irq:
1231 rmi_disable_irq(rmi_dev, false);
1232err_destroy_functions:
1233 rmi_free_function_list(rmi_dev);
1234err:
1235 return retval;
1236}
1237
1238static struct rmi_driver rmi_physical_driver = {
1239 .driver = {
1240 .owner = THIS_MODULE,
1241 .name = "rmi4_physical",
1242 .bus = &rmi_bus_type,
1243 .probe = rmi_driver_probe,
1244 .remove = rmi_driver_remove,
1245 },
1246 .reset_handler = rmi_driver_reset_handler,
1247 .clear_irq_bits = rmi_driver_clear_irq_bits,
1248 .set_irq_bits = rmi_driver_set_irq_bits,
1249 .set_input_params = rmi_driver_set_input_params,
1250};
1251
1252bool rmi_is_physical_driver(struct device_driver *drv)
1253{
1254 return drv == &rmi_physical_driver.driver;
1255}
1256
1257int __init rmi_register_physical_driver(void)
1258{
1259 int error;
1260
1261 error = driver_register(&rmi_physical_driver.driver);
1262 if (error) {
1263 pr_err("%s: driver register failed, code=%d.\n", __func__,
1264 error);
1265 return error;
1266 }
1267
1268 return 0;
1269}
1270
1271void __exit rmi_unregister_physical_driver(void)
1272{
1273 driver_unregister(&rmi_physical_driver.driver);
1274}
1275