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17#include <linux/delay.h>
18#include <linux/i2c.h>
19#include <linux/input.h>
20#include <linux/input/mt.h>
21#include <linux/interrupt.h>
22#include <linux/module.h>
23#include <linux/mutex.h>
24#include <linux/slab.h>
25#include <linux/uaccess.h>
26#include <linux/pm_runtime.h>
27#include <linux/acpi.h>
28#include "cyapa.h"
29
30
31#define CYAPA_ADAPTER_FUNC_NONE 0
32#define CYAPA_ADAPTER_FUNC_I2C 1
33#define CYAPA_ADAPTER_FUNC_SMBUS 2
34#define CYAPA_ADAPTER_FUNC_BOTH 3
35
36#define CYAPA_FW_NAME "cyapa.bin"
37
38const char product_id[] = "CYTRA";
39
40static int cyapa_reinitialize(struct cyapa *cyapa);
41
42static inline bool cyapa_is_bootloader_mode(struct cyapa *cyapa)
43{
44 if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL)
45 return true;
46
47 if (cyapa->gen == CYAPA_GEN3 &&
48 cyapa->state >= CYAPA_STATE_BL_BUSY &&
49 cyapa->state <= CYAPA_STATE_BL_ACTIVE)
50 return true;
51
52 return false;
53}
54
55static inline bool cyapa_is_operational_mode(struct cyapa *cyapa)
56{
57 if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP)
58 return true;
59
60 if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP)
61 return true;
62
63 return false;
64}
65
66
67static ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len,
68 u8 *values)
69{
70 struct i2c_client *client = cyapa->client;
71 struct i2c_msg msgs[] = {
72 {
73 .addr = client->addr,
74 .flags = 0,
75 .len = 1,
76 .buf = ®,
77 },
78 {
79 .addr = client->addr,
80 .flags = I2C_M_RD,
81 .len = len,
82 .buf = values,
83 },
84 };
85 int ret;
86
87 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
88
89 if (ret != ARRAY_SIZE(msgs))
90 return ret < 0 ? ret : -EIO;
91
92 return 0;
93}
94
95
96
97
98
99
100
101
102
103
104static int cyapa_i2c_write(struct cyapa *cyapa, u8 reg,
105 size_t len, const void *values)
106{
107 struct i2c_client *client = cyapa->client;
108 char buf[32];
109 int ret;
110
111 if (len > sizeof(buf) - 1)
112 return -ENOMEM;
113
114 buf[0] = reg;
115 memcpy(&buf[1], values, len);
116
117 ret = i2c_master_send(client, buf, len + 1);
118 if (ret != len + 1)
119 return ret < 0 ? ret : -EIO;
120
121 return 0;
122}
123
124static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
125{
126 u8 ret = CYAPA_ADAPTER_FUNC_NONE;
127
128 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
129 ret |= CYAPA_ADAPTER_FUNC_I2C;
130 if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
131 I2C_FUNC_SMBUS_BLOCK_DATA |
132 I2C_FUNC_SMBUS_I2C_BLOCK))
133 ret |= CYAPA_ADAPTER_FUNC_SMBUS;
134 return ret;
135}
136
137
138
139
140static int cyapa_get_state(struct cyapa *cyapa)
141{
142 u8 status[BL_STATUS_SIZE];
143 u8 cmd[32];
144
145 bool even_addr = ((cyapa->client->addr & 0x0001) == 0);
146 bool smbus = false;
147 int retries = 2;
148 int error;
149
150 cyapa->state = CYAPA_STATE_NO_DEVICE;
151
152
153
154
155
156
157
158 error = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
159 status);
160
161
162
163
164
165
166 if (cyapa->smbus && (error == -ETIMEDOUT || error == -ENXIO)) {
167 if (!even_addr)
168 error = cyapa_read_block(cyapa,
169 CYAPA_CMD_BL_STATUS, status);
170 smbus = true;
171 }
172
173 if (error != BL_STATUS_SIZE)
174 goto error;
175
176
177
178
179 do {
180 cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS];
181 cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS];
182 cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR];
183
184 if (cyapa->gen == CYAPA_GEN_UNKNOWN ||
185 cyapa->gen == CYAPA_GEN3) {
186 error = cyapa_gen3_ops.state_parse(cyapa,
187 status, BL_STATUS_SIZE);
188 if (!error)
189 goto out_detected;
190 }
191 if ((cyapa->gen == CYAPA_GEN_UNKNOWN ||
192 cyapa->gen == CYAPA_GEN5) &&
193 !smbus && even_addr) {
194 error = cyapa_gen5_ops.state_parse(cyapa,
195 status, BL_STATUS_SIZE);
196 if (!error)
197 goto out_detected;
198 }
199
200
201
202
203
204 if (!smbus) {
205 cmd[0] = 0x00;
206 cmd[1] = 0x00;
207 error = cyapa_i2c_write(cyapa, 0, 2, cmd);
208 if (error)
209 goto error;
210
211 msleep(50);
212
213 error = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET,
214 BL_STATUS_SIZE, status);
215 if (error)
216 goto error;
217 }
218 } while (--retries > 0 && !smbus);
219
220 goto error;
221
222out_detected:
223 if (cyapa->state <= CYAPA_STATE_BL_BUSY)
224 return -EAGAIN;
225 return 0;
226
227error:
228 return (error < 0) ? error : -EAGAIN;
229}
230
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241
242
243
244
245
246int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
247{
248 int error;
249 int tries = timeout / 100;
250
251 do {
252 error = cyapa_get_state(cyapa);
253 if (!error && cyapa->state > CYAPA_STATE_BL_BUSY)
254 return 0;
255
256 msleep(100);
257 } while (tries--);
258
259 return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error;
260}
261
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273
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275
276
277
278static int cyapa_check_is_operational(struct cyapa *cyapa)
279{
280 int error;
281
282 error = cyapa_poll_state(cyapa, 4000);
283 if (error)
284 return error;
285
286 switch (cyapa->gen) {
287 case CYAPA_GEN5:
288 cyapa->ops = &cyapa_gen5_ops;
289 break;
290 case CYAPA_GEN3:
291 cyapa->ops = &cyapa_gen3_ops;
292 break;
293 default:
294 return -ENODEV;
295 }
296
297 error = cyapa->ops->operational_check(cyapa);
298 if (!error && cyapa_is_operational_mode(cyapa))
299 cyapa->operational = true;
300 else
301 cyapa->operational = false;
302
303 return error;
304}
305
306
307
308
309
310
311
312static int cyapa_detect(struct cyapa *cyapa)
313{
314 struct device *dev = &cyapa->client->dev;
315 int error;
316
317 error = cyapa_check_is_operational(cyapa);
318 if (error) {
319 if (error != -ETIMEDOUT && error != -ENODEV &&
320 cyapa_is_bootloader_mode(cyapa)) {
321 dev_warn(dev, "device detected but not operational\n");
322 return 0;
323 }
324
325 dev_err(dev, "no device detected: %d\n", error);
326 return error;
327 }
328
329 return 0;
330}
331
332static int cyapa_open(struct input_dev *input)
333{
334 struct cyapa *cyapa = input_get_drvdata(input);
335 struct i2c_client *client = cyapa->client;
336 int error;
337
338 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
339 if (error)
340 return error;
341
342 if (cyapa->operational) {
343
344
345
346
347
348 error = cyapa->ops->set_power_mode(cyapa,
349 PWR_MODE_FULL_ACTIVE, 0);
350 if (error) {
351 dev_warn(&client->dev,
352 "set active power failed: %d\n", error);
353 goto out;
354 }
355 } else {
356 error = cyapa_reinitialize(cyapa);
357 if (error || !cyapa->operational) {
358 error = error ? error : -EAGAIN;
359 goto out;
360 }
361 }
362
363 enable_irq(client->irq);
364 if (!pm_runtime_enabled(&client->dev)) {
365 pm_runtime_set_active(&client->dev);
366 pm_runtime_enable(&client->dev);
367 }
368out:
369 mutex_unlock(&cyapa->state_sync_lock);
370 return error;
371}
372
373static void cyapa_close(struct input_dev *input)
374{
375 struct cyapa *cyapa = input_get_drvdata(input);
376 struct i2c_client *client = cyapa->client;
377
378 mutex_lock(&cyapa->state_sync_lock);
379
380 disable_irq(client->irq);
381 if (pm_runtime_enabled(&client->dev))
382 pm_runtime_disable(&client->dev);
383 pm_runtime_set_suspended(&client->dev);
384
385 if (cyapa->operational)
386 cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
387
388 mutex_unlock(&cyapa->state_sync_lock);
389}
390
391static int cyapa_create_input_dev(struct cyapa *cyapa)
392{
393 struct device *dev = &cyapa->client->dev;
394 struct input_dev *input;
395 int error;
396
397 if (!cyapa->physical_size_x || !cyapa->physical_size_y)
398 return -EINVAL;
399
400 input = devm_input_allocate_device(dev);
401 if (!input) {
402 dev_err(dev, "failed to allocate memory for input device.\n");
403 return -ENOMEM;
404 }
405
406 input->name = CYAPA_NAME;
407 input->phys = cyapa->phys;
408 input->id.bustype = BUS_I2C;
409 input->id.version = 1;
410 input->id.product = 0;
411 input->dev.parent = &cyapa->client->dev;
412
413 input->open = cyapa_open;
414 input->close = cyapa_close;
415
416 input_set_drvdata(input, cyapa);
417
418 __set_bit(EV_ABS, input->evbit);
419
420
421 input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
422 0);
423 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
424 0);
425 input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0);
426 if (cyapa->gen > CYAPA_GEN3) {
427 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
428 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
429
430
431
432
433
434
435
436
437
438
439
440 input_set_abs_params(input, ABS_MT_ORIENTATION,
441 -127, 127, 0, 0);
442 }
443 if (cyapa->gen >= CYAPA_GEN5) {
444 input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
445 input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0);
446 }
447
448 input_abs_set_res(input, ABS_MT_POSITION_X,
449 cyapa->max_abs_x / cyapa->physical_size_x);
450 input_abs_set_res(input, ABS_MT_POSITION_Y,
451 cyapa->max_abs_y / cyapa->physical_size_y);
452
453 if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
454 __set_bit(BTN_LEFT, input->keybit);
455 if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
456 __set_bit(BTN_MIDDLE, input->keybit);
457 if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
458 __set_bit(BTN_RIGHT, input->keybit);
459
460 if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
461 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
462
463
464 error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
465 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
466 if (error) {
467 dev_err(dev, "failed to initialize MT slots: %d\n", error);
468 return error;
469 }
470
471
472 error = input_register_device(input);
473 if (error) {
474 dev_err(dev, "failed to register input device: %d\n", error);
475 return error;
476 }
477
478 cyapa->input = input;
479 return 0;
480}
481
482static void cyapa_enable_irq_for_cmd(struct cyapa *cyapa)
483{
484 struct input_dev *input = cyapa->input;
485
486 if (!input || !input->users) {
487
488
489
490
491
492
493 if (!input || cyapa->operational)
494 cyapa->ops->set_power_mode(cyapa,
495 PWR_MODE_FULL_ACTIVE, 0);
496
497 if (cyapa->gen >= CYAPA_GEN5)
498 enable_irq(cyapa->client->irq);
499 }
500}
501
502static void cyapa_disable_irq_for_cmd(struct cyapa *cyapa)
503{
504 struct input_dev *input = cyapa->input;
505
506 if (!input || !input->users) {
507 if (cyapa->gen >= CYAPA_GEN5)
508 disable_irq(cyapa->client->irq);
509 if (!input || cyapa->operational)
510 cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
511 }
512}
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time)
529{
530 u16 encoded_time;
531
532 sleep_time = clamp_val(sleep_time, 20, 1000);
533 encoded_time = sleep_time < 100 ? sleep_time / 10 : sleep_time / 20 + 5;
534 return (encoded_time << 2) & PWR_MODE_MASK;
535}
536
537u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
538{
539 u8 encoded_time = pwr_mode >> 2;
540
541 return (encoded_time < 10) ? encoded_time * 10
542 : (encoded_time - 5) * 20;
543}
544
545
546static int cyapa_initialize(struct cyapa *cyapa)
547{
548 int error = 0;
549
550 cyapa->state = CYAPA_STATE_NO_DEVICE;
551 cyapa->gen = CYAPA_GEN_UNKNOWN;
552 mutex_init(&cyapa->state_sync_lock);
553
554
555
556
557
558 cyapa->suspend_power_mode = PWR_MODE_SLEEP;
559 cyapa->suspend_sleep_time =
560 cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
561
562
563 error = cyapa_gen3_ops.initialize(cyapa);
564 if (!error)
565 error = cyapa_gen5_ops.initialize(cyapa);
566 if (error)
567 return error;
568
569 error = cyapa_detect(cyapa);
570 if (error)
571 return error;
572
573
574 if (cyapa->operational)
575 cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
576
577 return 0;
578}
579
580static int cyapa_reinitialize(struct cyapa *cyapa)
581{
582 struct device *dev = &cyapa->client->dev;
583 struct input_dev *input = cyapa->input;
584 int error;
585
586 if (pm_runtime_enabled(dev))
587 pm_runtime_disable(dev);
588
589
590 if (cyapa->operational)
591 cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
592
593 error = cyapa_detect(cyapa);
594 if (error)
595 goto out;
596
597 if (!input && cyapa->operational) {
598 error = cyapa_create_input_dev(cyapa);
599 if (error) {
600 dev_err(dev, "create input_dev instance failed: %d\n",
601 error);
602 goto out;
603 }
604 }
605
606out:
607 if (!input || !input->users) {
608
609 if (cyapa->operational)
610 cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
611 } else if (!error && cyapa->operational) {
612
613
614
615
616 pm_runtime_set_active(dev);
617 pm_runtime_enable(dev);
618 }
619
620 return error;
621}
622
623static irqreturn_t cyapa_irq(int irq, void *dev_id)
624{
625 struct cyapa *cyapa = dev_id;
626 struct device *dev = &cyapa->client->dev;
627
628 pm_runtime_get_sync(dev);
629 if (device_may_wakeup(dev))
630 pm_wakeup_event(dev, 0);
631
632
633 if (cyapa->ops->irq_cmd_handler(cyapa)) {
634
635
636
637 if (!cyapa->input) {
638
639
640
641
642 cyapa->ops->sort_empty_output_data(cyapa,
643 NULL, NULL, NULL);
644 goto out;
645 }
646
647 if (!cyapa->operational || cyapa->ops->irq_handler(cyapa)) {
648 if (!mutex_trylock(&cyapa->state_sync_lock)) {
649 cyapa->ops->sort_empty_output_data(cyapa,
650 NULL, NULL, NULL);
651 goto out;
652 }
653 cyapa_reinitialize(cyapa);
654 mutex_unlock(&cyapa->state_sync_lock);
655 }
656 }
657
658out:
659 pm_runtime_mark_last_busy(dev);
660 pm_runtime_put_sync_autosuspend(dev);
661 return IRQ_HANDLED;
662}
663
664
665
666
667
668
669#ifdef CONFIG_PM_SLEEP
670static ssize_t cyapa_show_suspend_scanrate(struct device *dev,
671 struct device_attribute *attr,
672 char *buf)
673{
674 struct cyapa *cyapa = dev_get_drvdata(dev);
675 u8 pwr_cmd = cyapa->suspend_power_mode;
676 u16 sleep_time;
677 int len;
678 int error;
679
680 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
681 if (error)
682 return error;
683
684 pwr_cmd = cyapa->suspend_power_mode;
685 sleep_time = cyapa->suspend_sleep_time;
686
687 mutex_unlock(&cyapa->state_sync_lock);
688
689 switch (pwr_cmd) {
690 case PWR_MODE_BTN_ONLY:
691 len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME);
692 break;
693
694 case PWR_MODE_OFF:
695 len = scnprintf(buf, PAGE_SIZE, "%s\n", OFF_MODE_NAME);
696 break;
697
698 default:
699 len = scnprintf(buf, PAGE_SIZE, "%u\n",
700 cyapa->gen == CYAPA_GEN3 ?
701 cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
702 sleep_time);
703 break;
704 }
705
706 return len;
707}
708
709static ssize_t cyapa_update_suspend_scanrate(struct device *dev,
710 struct device_attribute *attr,
711 const char *buf, size_t count)
712{
713 struct cyapa *cyapa = dev_get_drvdata(dev);
714 u16 sleep_time;
715 int error;
716
717 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
718 if (error)
719 return error;
720
721 if (sysfs_streq(buf, BTN_ONLY_MODE_NAME)) {
722 cyapa->suspend_power_mode = PWR_MODE_BTN_ONLY;
723 } else if (sysfs_streq(buf, OFF_MODE_NAME)) {
724 cyapa->suspend_power_mode = PWR_MODE_OFF;
725 } else if (!kstrtou16(buf, 10, &sleep_time)) {
726 cyapa->suspend_sleep_time = min_t(u16, sleep_time, 1000);
727 cyapa->suspend_power_mode =
728 cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time);
729 } else {
730 count = -EINVAL;
731 }
732
733 mutex_unlock(&cyapa->state_sync_lock);
734
735 return count;
736}
737
738static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR,
739 cyapa_show_suspend_scanrate,
740 cyapa_update_suspend_scanrate);
741
742static struct attribute *cyapa_power_wakeup_entries[] = {
743 &dev_attr_suspend_scanrate_ms.attr,
744 NULL,
745};
746
747static const struct attribute_group cyapa_power_wakeup_group = {
748 .name = power_group_name,
749 .attrs = cyapa_power_wakeup_entries,
750};
751
752static void cyapa_remove_power_wakeup_group(void *data)
753{
754 struct cyapa *cyapa = data;
755
756 sysfs_unmerge_group(&cyapa->client->dev.kobj,
757 &cyapa_power_wakeup_group);
758}
759
760static int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
761{
762 struct i2c_client *client = cyapa->client;
763 struct device *dev = &client->dev;
764 int error;
765
766 if (device_can_wakeup(dev)) {
767 error = sysfs_merge_group(&client->dev.kobj,
768 &cyapa_power_wakeup_group);
769 if (error) {
770 dev_err(dev, "failed to add power wakeup group: %d\n",
771 error);
772 return error;
773 }
774
775 error = devm_add_action(dev,
776 cyapa_remove_power_wakeup_group, cyapa);
777 if (error) {
778 cyapa_remove_power_wakeup_group(cyapa);
779 dev_err(dev, "failed to add power cleanup action: %d\n",
780 error);
781 return error;
782 }
783 }
784
785 return 0;
786}
787#else
788static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
789{
790 return 0;
791}
792#endif
793
794#ifdef CONFIG_PM
795static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev,
796 struct device_attribute *attr,
797 char *buf)
798{
799 struct cyapa *cyapa = dev_get_drvdata(dev);
800 u8 pwr_cmd;
801 u16 sleep_time;
802 int error;
803
804 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
805 if (error)
806 return error;
807
808 pwr_cmd = cyapa->runtime_suspend_power_mode;
809 sleep_time = cyapa->runtime_suspend_sleep_time;
810
811 mutex_unlock(&cyapa->state_sync_lock);
812
813 return scnprintf(buf, PAGE_SIZE, "%u\n",
814 cyapa->gen == CYAPA_GEN3 ?
815 cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
816 sleep_time);
817}
818
819static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev,
820 struct device_attribute *attr,
821 const char *buf, size_t count)
822{
823 struct cyapa *cyapa = dev_get_drvdata(dev);
824 u16 time;
825 int error;
826
827 if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) {
828 dev_err(dev, "invalid runtime suspend scanrate ms parameter\n");
829 return -EINVAL;
830 }
831
832
833
834
835
836
837 pm_runtime_get_sync(dev);
838
839 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
840 if (error)
841 return error;
842
843 cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000);
844 cyapa->runtime_suspend_power_mode =
845 cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time);
846
847 mutex_unlock(&cyapa->state_sync_lock);
848
849 pm_runtime_put_sync_autosuspend(dev);
850
851 return count;
852}
853
854static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR,
855 cyapa_show_rt_suspend_scanrate,
856 cyapa_update_rt_suspend_scanrate);
857
858static struct attribute *cyapa_power_runtime_entries[] = {
859 &dev_attr_runtime_suspend_scanrate_ms.attr,
860 NULL,
861};
862
863static const struct attribute_group cyapa_power_runtime_group = {
864 .name = power_group_name,
865 .attrs = cyapa_power_runtime_entries,
866};
867
868static void cyapa_remove_power_runtime_group(void *data)
869{
870 struct cyapa *cyapa = data;
871
872 sysfs_unmerge_group(&cyapa->client->dev.kobj,
873 &cyapa_power_runtime_group);
874}
875
876static int cyapa_start_runtime(struct cyapa *cyapa)
877{
878 struct device *dev = &cyapa->client->dev;
879 int error;
880
881 cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE;
882 cyapa->runtime_suspend_sleep_time =
883 cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode);
884
885 error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group);
886 if (error) {
887 dev_err(dev,
888 "failed to create power runtime group: %d\n", error);
889 return error;
890 }
891
892 error = devm_add_action(dev, cyapa_remove_power_runtime_group, cyapa);
893 if (error) {
894 cyapa_remove_power_runtime_group(cyapa);
895 dev_err(dev,
896 "failed to add power runtime cleanup action: %d\n",
897 error);
898 return error;
899 }
900
901
902 pm_runtime_set_suspended(dev);
903 pm_runtime_use_autosuspend(dev);
904 pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
905
906 return 0;
907}
908#else
909static inline int cyapa_start_runtime(struct cyapa *cyapa)
910{
911 return 0;
912}
913#endif
914
915static ssize_t cyapa_show_fm_ver(struct device *dev,
916 struct device_attribute *attr, char *buf)
917{
918 int error;
919 struct cyapa *cyapa = dev_get_drvdata(dev);
920
921 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
922 if (error)
923 return error;
924 error = scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->fw_maj_ver,
925 cyapa->fw_min_ver);
926 mutex_unlock(&cyapa->state_sync_lock);
927 return error;
928}
929
930static ssize_t cyapa_show_product_id(struct device *dev,
931 struct device_attribute *attr, char *buf)
932{
933 struct cyapa *cyapa = dev_get_drvdata(dev);
934 int size;
935 int error;
936
937 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
938 if (error)
939 return error;
940 size = scnprintf(buf, PAGE_SIZE, "%s\n", cyapa->product_id);
941 mutex_unlock(&cyapa->state_sync_lock);
942 return size;
943}
944
945static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name)
946{
947 struct device *dev = &cyapa->client->dev;
948 const struct firmware *fw;
949 int error;
950
951 error = request_firmware(&fw, fw_name, dev);
952 if (error) {
953 dev_err(dev, "Could not load firmware from %s: %d\n",
954 fw_name, error);
955 return error;
956 }
957
958 error = cyapa->ops->check_fw(cyapa, fw);
959 if (error) {
960 dev_err(dev, "Invalid CYAPA firmware image: %s\n",
961 fw_name);
962 goto done;
963 }
964
965
966
967
968
969
970 pm_runtime_get_sync(dev);
971
972
973 cyapa_enable_irq_for_cmd(cyapa);
974
975 error = cyapa->ops->bl_enter(cyapa);
976 if (error) {
977 dev_err(dev, "bl_enter failed, %d\n", error);
978 goto err_detect;
979 }
980
981 error = cyapa->ops->bl_activate(cyapa);
982 if (error) {
983 dev_err(dev, "bl_activate failed, %d\n", error);
984 goto err_detect;
985 }
986
987 error = cyapa->ops->bl_initiate(cyapa, fw);
988 if (error) {
989 dev_err(dev, "bl_initiate failed, %d\n", error);
990 goto err_detect;
991 }
992
993 error = cyapa->ops->update_fw(cyapa, fw);
994 if (error) {
995 dev_err(dev, "update_fw failed, %d\n", error);
996 goto err_detect;
997 }
998
999err_detect:
1000 cyapa_disable_irq_for_cmd(cyapa);
1001 pm_runtime_put_noidle(dev);
1002
1003done:
1004 release_firmware(fw);
1005 return error;
1006}
1007
1008static ssize_t cyapa_update_fw_store(struct device *dev,
1009 struct device_attribute *attr,
1010 const char *buf, size_t count)
1011{
1012 struct cyapa *cyapa = dev_get_drvdata(dev);
1013 char fw_name[NAME_MAX];
1014 int ret, error;
1015
1016 if (count >= NAME_MAX) {
1017 dev_err(dev, "File name too long\n");
1018 return -EINVAL;
1019 }
1020
1021 memcpy(fw_name, buf, count);
1022 if (fw_name[count - 1] == '\n')
1023 fw_name[count - 1] = '\0';
1024 else
1025 fw_name[count] = '\0';
1026
1027 if (cyapa->input) {
1028
1029
1030
1031
1032
1033 input_unregister_device(cyapa->input);
1034 cyapa->input = NULL;
1035 }
1036
1037 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1038 if (error) {
1039
1040
1041
1042
1043 cyapa_reinitialize(cyapa);
1044 return error;
1045 }
1046
1047 error = cyapa_firmware(cyapa, fw_name);
1048 if (error)
1049 dev_err(dev, "firmware update failed: %d\n", error);
1050 else
1051 dev_dbg(dev, "firmware update successfully done.\n");
1052
1053
1054
1055
1056
1057 ret = cyapa_reinitialize(cyapa);
1058 if (ret) {
1059 dev_err(dev, "failed to redetect after updated: %d\n", ret);
1060 error = error ? error : ret;
1061 }
1062
1063 mutex_unlock(&cyapa->state_sync_lock);
1064
1065 return error ? error : count;
1066}
1067
1068static ssize_t cyapa_calibrate_store(struct device *dev,
1069 struct device_attribute *attr,
1070 const char *buf, size_t count)
1071{
1072 struct cyapa *cyapa = dev_get_drvdata(dev);
1073 int error;
1074
1075 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1076 if (error)
1077 return error;
1078
1079 if (cyapa->operational) {
1080 cyapa_enable_irq_for_cmd(cyapa);
1081 error = cyapa->ops->calibrate_store(dev, attr, buf, count);
1082 cyapa_disable_irq_for_cmd(cyapa);
1083 } else {
1084 error = -EBUSY;
1085 }
1086
1087 mutex_unlock(&cyapa->state_sync_lock);
1088 return error < 0 ? error : count;
1089}
1090
1091static ssize_t cyapa_show_baseline(struct device *dev,
1092 struct device_attribute *attr, char *buf)
1093{
1094 struct cyapa *cyapa = dev_get_drvdata(dev);
1095 ssize_t error;
1096
1097 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1098 if (error)
1099 return error;
1100
1101 if (cyapa->operational) {
1102 cyapa_enable_irq_for_cmd(cyapa);
1103 error = cyapa->ops->show_baseline(dev, attr, buf);
1104 cyapa_disable_irq_for_cmd(cyapa);
1105 } else {
1106 error = -EBUSY;
1107 }
1108
1109 mutex_unlock(&cyapa->state_sync_lock);
1110 return error;
1111}
1112
1113static char *cyapa_state_to_string(struct cyapa *cyapa)
1114{
1115 switch (cyapa->state) {
1116 case CYAPA_STATE_BL_BUSY:
1117 return "bootloader busy";
1118 case CYAPA_STATE_BL_IDLE:
1119 return "bootloader idle";
1120 case CYAPA_STATE_BL_ACTIVE:
1121 return "bootloader active";
1122 case CYAPA_STATE_GEN5_BL:
1123 return "bootloader";
1124 case CYAPA_STATE_OP:
1125 case CYAPA_STATE_GEN5_APP:
1126 return "operational";
1127 default:
1128 return "invalid mode";
1129 }
1130}
1131
1132static ssize_t cyapa_show_mode(struct device *dev,
1133 struct device_attribute *attr, char *buf)
1134{
1135 struct cyapa *cyapa = dev_get_drvdata(dev);
1136 int size;
1137 int error;
1138
1139 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1140 if (error)
1141 return error;
1142
1143 size = scnprintf(buf, PAGE_SIZE, "gen%d %s\n",
1144 cyapa->gen, cyapa_state_to_string(cyapa));
1145
1146 mutex_unlock(&cyapa->state_sync_lock);
1147 return size;
1148}
1149
1150static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL);
1151static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL);
1152static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store);
1153static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL);
1154static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store);
1155static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL);
1156
1157static struct attribute *cyapa_sysfs_entries[] = {
1158 &dev_attr_firmware_version.attr,
1159 &dev_attr_product_id.attr,
1160 &dev_attr_update_fw.attr,
1161 &dev_attr_baseline.attr,
1162 &dev_attr_calibrate.attr,
1163 &dev_attr_mode.attr,
1164 NULL,
1165};
1166
1167static const struct attribute_group cyapa_sysfs_group = {
1168 .attrs = cyapa_sysfs_entries,
1169};
1170
1171static void cyapa_remove_sysfs_group(void *data)
1172{
1173 struct cyapa *cyapa = data;
1174
1175 sysfs_remove_group(&cyapa->client->dev.kobj, &cyapa_sysfs_group);
1176}
1177
1178static int cyapa_probe(struct i2c_client *client,
1179 const struct i2c_device_id *dev_id)
1180{
1181 struct device *dev = &client->dev;
1182 struct cyapa *cyapa;
1183 u8 adapter_func;
1184 union i2c_smbus_data dummy;
1185 int error;
1186
1187 adapter_func = cyapa_check_adapter_functionality(client);
1188 if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
1189 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1190 return -EIO;
1191 }
1192
1193
1194 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1195 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
1196 return -ENODEV;
1197
1198 cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL);
1199 if (!cyapa)
1200 return -ENOMEM;
1201
1202
1203 if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
1204 cyapa->smbus = true;
1205
1206 cyapa->client = client;
1207 i2c_set_clientdata(client, cyapa);
1208 sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
1209 client->addr);
1210
1211 error = cyapa_initialize(cyapa);
1212 if (error) {
1213 dev_err(dev, "failed to detect and initialize tp device.\n");
1214 return error;
1215 }
1216
1217 error = sysfs_create_group(&client->dev.kobj, &cyapa_sysfs_group);
1218 if (error) {
1219 dev_err(dev, "failed to create sysfs entries: %d\n", error);
1220 return error;
1221 }
1222
1223 error = devm_add_action(dev, cyapa_remove_sysfs_group, cyapa);
1224 if (error) {
1225 cyapa_remove_sysfs_group(cyapa);
1226 dev_err(dev, "failed to add sysfs cleanup action: %d\n", error);
1227 return error;
1228 }
1229
1230 error = cyapa_prepare_wakeup_controls(cyapa);
1231 if (error) {
1232 dev_err(dev, "failed to prepare wakeup controls: %d\n", error);
1233 return error;
1234 }
1235
1236 error = cyapa_start_runtime(cyapa);
1237 if (error) {
1238 dev_err(dev, "failed to start pm_runtime: %d\n", error);
1239 return error;
1240 }
1241
1242 error = devm_request_threaded_irq(dev, client->irq,
1243 NULL, cyapa_irq,
1244 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1245 "cyapa", cyapa);
1246 if (error) {
1247 dev_err(dev, "failed to request threaded irq: %d\n", error);
1248 return error;
1249 }
1250
1251
1252 disable_irq(client->irq);
1253
1254
1255
1256
1257
1258
1259 if (cyapa->operational) {
1260 error = cyapa_create_input_dev(cyapa);
1261 if (error) {
1262 dev_err(dev, "create input_dev instance failed: %d\n",
1263 error);
1264 return error;
1265 }
1266 }
1267
1268 return 0;
1269}
1270
1271static int __maybe_unused cyapa_suspend(struct device *dev)
1272{
1273 struct i2c_client *client = to_i2c_client(dev);
1274 struct cyapa *cyapa = i2c_get_clientdata(client);
1275 u8 power_mode;
1276 int error;
1277
1278 error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1279 if (error)
1280 return error;
1281
1282
1283
1284
1285
1286
1287 if (pm_runtime_enabled(dev))
1288 pm_runtime_disable(dev);
1289 disable_irq(client->irq);
1290
1291
1292
1293
1294
1295 if (cyapa->operational) {
1296 power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode
1297 : PWR_MODE_OFF;
1298 error = cyapa->ops->set_power_mode(cyapa, power_mode,
1299 cyapa->suspend_sleep_time);
1300 if (error)
1301 dev_err(dev, "suspend set power mode failed: %d\n",
1302 error);
1303 }
1304
1305 if (device_may_wakeup(dev))
1306 cyapa->irq_wake = (enable_irq_wake(client->irq) == 0);
1307
1308 mutex_unlock(&cyapa->state_sync_lock);
1309 return 0;
1310}
1311
1312static int __maybe_unused cyapa_resume(struct device *dev)
1313{
1314 struct i2c_client *client = to_i2c_client(dev);
1315 struct cyapa *cyapa = i2c_get_clientdata(client);
1316 int error;
1317
1318 mutex_lock(&cyapa->state_sync_lock);
1319
1320 if (device_may_wakeup(dev) && cyapa->irq_wake) {
1321 disable_irq_wake(client->irq);
1322 cyapa->irq_wake = false;
1323 }
1324
1325
1326 error = cyapa_reinitialize(cyapa);
1327 if (error)
1328 dev_warn(dev, "failed to reinitialize TP device: %d\n", error);
1329
1330 enable_irq(client->irq);
1331
1332 mutex_unlock(&cyapa->state_sync_lock);
1333 return 0;
1334}
1335
1336static int __maybe_unused cyapa_runtime_suspend(struct device *dev)
1337{
1338 struct cyapa *cyapa = dev_get_drvdata(dev);
1339 int error;
1340
1341 error = cyapa->ops->set_power_mode(cyapa,
1342 cyapa->runtime_suspend_power_mode,
1343 cyapa->runtime_suspend_sleep_time);
1344 if (error)
1345 dev_warn(dev, "runtime suspend failed: %d\n", error);
1346
1347 return 0;
1348}
1349
1350static int __maybe_unused cyapa_runtime_resume(struct device *dev)
1351{
1352 struct cyapa *cyapa = dev_get_drvdata(dev);
1353 int error;
1354
1355 error = cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
1356 if (error)
1357 dev_warn(dev, "runtime resume failed: %d\n", error);
1358
1359 return 0;
1360}
1361
1362static const struct dev_pm_ops cyapa_pm_ops = {
1363 SET_SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume)
1364 SET_RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL)
1365};
1366
1367static const struct i2c_device_id cyapa_id_table[] = {
1368 { "cyapa", 0 },
1369 { },
1370};
1371MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
1372
1373#ifdef CONFIG_ACPI
1374static const struct acpi_device_id cyapa_acpi_id[] = {
1375 { "CYAP0000", 0 },
1376 { "CYAP0001", 0 },
1377 { }
1378};
1379MODULE_DEVICE_TABLE(acpi, cyapa_acpi_id);
1380#endif
1381
1382static struct i2c_driver cyapa_driver = {
1383 .driver = {
1384 .name = "cyapa",
1385 .owner = THIS_MODULE,
1386 .pm = &cyapa_pm_ops,
1387 .acpi_match_table = ACPI_PTR(cyapa_acpi_id),
1388 },
1389
1390 .probe = cyapa_probe,
1391 .id_table = cyapa_id_table,
1392};
1393
1394module_i2c_driver(cyapa_driver);
1395
1396MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
1397MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
1398MODULE_LICENSE("GPL");
1399