1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
|
/*
* Cypress APA trackpad with I2C interface
*
* Author: Dudley Du <dudl@cypress.com>
* Further cleanup and restructuring by:
* Daniel Kurtz <djkurtz@chromium.org>
* Benson Leung <bleung@chromium.org>
*
* Copyright (C) 2011-2014 Cypress Semiconductor, Inc.
* Copyright (C) 2011-2012 Google, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "cyapa.h"
#define CYAPA_ADAPTER_FUNC_NONE 0
#define CYAPA_ADAPTER_FUNC_I2C 1
#define CYAPA_ADAPTER_FUNC_SMBUS 2
#define CYAPA_ADAPTER_FUNC_BOTH 3
const char product_id[] = "CYTRA";
static int cyapa_reinitialize(struct cyapa *cyapa);
static inline bool cyapa_is_bootloader_mode(struct cyapa *cyapa)
{
if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL)
return true;
if (cyapa->gen == CYAPA_GEN3 &&
cyapa->state >= CYAPA_STATE_BL_BUSY &&
cyapa->state <= CYAPA_STATE_BL_ACTIVE)
return true;
return false;
}
static inline bool cyapa_is_operational_mode(struct cyapa *cyapa)
{
if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP)
return true;
if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP)
return true;
return false;
}
/* Returns 0 on success, else negative errno on failure. */
static ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len,
u8 *values)
{
struct i2c_client *client = cyapa->client;
struct i2c_msg msgs[] = {
{
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = ®,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = values,
},
};
int ret;
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (ret != ARRAY_SIZE(msgs))
return ret < 0 ? ret : -EIO;
return 0;
}
/**
* cyapa_i2c_write - Execute i2c block data write operation
* @cyapa: Handle to this driver
* @ret: Offset of the data to written in the register map
* @len: number of bytes to write
* @values: Data to be written
*
* Return negative errno code on error; return zero when success.
*/
static int cyapa_i2c_write(struct cyapa *cyapa, u8 reg,
size_t len, const void *values)
{
struct i2c_client *client = cyapa->client;
char buf[32];
int ret;
if (len > sizeof(buf) - 1)
return -ENOMEM;
buf[0] = reg;
memcpy(&buf[1], values, len);
ret = i2c_master_send(client, buf, len + 1);
if (ret != len + 1)
return ret < 0 ? ret : -EIO;
return 0;
}
static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
{
u8 ret = CYAPA_ADAPTER_FUNC_NONE;
if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
ret |= CYAPA_ADAPTER_FUNC_I2C;
if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK))
ret |= CYAPA_ADAPTER_FUNC_SMBUS;
return ret;
}
/*
* Query device for its current operating state.
*/
static int cyapa_get_state(struct cyapa *cyapa)
{
u8 status[BL_STATUS_SIZE];
u8 cmd[32];
/* The i2c address of gen4 and gen5 trackpad device must be even. */
bool even_addr = ((cyapa->client->addr & 0x0001) == 0);
bool smbus = false;
int retries = 2;
int error;
cyapa->state = CYAPA_STATE_NO_DEVICE;
/*
* Get trackpad status by reading 3 registers starting from 0.
* If the device is in the bootloader, this will be BL_HEAD.
* If the device is in operation mode, this will be the DATA regs.
*
*/
error = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
status);
/*
* On smbus systems in OP mode, the i2c_reg_read will fail with
* -ETIMEDOUT. In this case, try again using the smbus equivalent
* command. This should return a BL_HEAD indicating CYAPA_STATE_OP.
*/
if (cyapa->smbus && (error == -ETIMEDOUT || error == -ENXIO)) {
if (!even_addr)
error = cyapa_read_block(cyapa,
CYAPA_CMD_BL_STATUS, status);
smbus = true;
}
if (error != BL_STATUS_SIZE)
goto error;
/*
* Detect trackpad protocol based on characteristic registers and bits.
*/
do {
cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS];
cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS];
cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR];
if (cyapa->gen == CYAPA_GEN_UNKNOWN ||
cyapa->gen == CYAPA_GEN3) {
error = cyapa_gen3_ops.state_parse(cyapa,
status, BL_STATUS_SIZE);
if (!error)
goto out_detected;
}
if ((cyapa->gen == CYAPA_GEN_UNKNOWN ||
cyapa->gen == CYAPA_GEN5) &&
!smbus && even_addr) {
error = cyapa_gen5_ops.state_parse(cyapa,
status, BL_STATUS_SIZE);
if (!error)
goto out_detected;
}
/*
* Write 0x00 0x00 to trackpad device to force update its
* status, then redo the detection again.
*/
if (!smbus) {
cmd[0] = 0x00;
cmd[1] = 0x00;
error = cyapa_i2c_write(cyapa, 0, 2, cmd);
if (error)
goto error;
msleep(50);
error = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET,
BL_STATUS_SIZE, status);
if (error)
goto error;
}
} while (--retries > 0 && !smbus);
goto error;
out_detected:
if (cyapa->state <= CYAPA_STATE_BL_BUSY)
return -EAGAIN;
return 0;
error:
return (error < 0) ? error : -EAGAIN;
}
/*
* Poll device for its status in a loop, waiting up to timeout for a response.
*
* When the device switches state, it usually takes ~300 ms.
* However, when running a new firmware image, the device must calibrate its
* sensors, which can take as long as 2 seconds.
*
* Note: The timeout has granularity of the polling rate, which is 100 ms.
*
* Returns:
* 0 when the device eventually responds with a valid non-busy state.
* -ETIMEDOUT if device never responds (too many -EAGAIN)
* -EAGAIN if bootload is busy, or unknown state.
* < 0 other errors
*/
int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
{
int error;
int tries = timeout / 100;
do {
error = cyapa_get_state(cyapa);
if (!error && cyapa->state > CYAPA_STATE_BL_BUSY)
return 0;
msleep(100);
} while (tries--);
return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error;
}
/*
* Check if device is operational.
*
* An operational device is responding, has exited bootloader, and has
* firmware supported by this driver.
*
* Returns:
* -ENODEV no device
* -EBUSY no device or in bootloader
* -EIO failure while reading from device
* -ETIMEDOUT timeout failure for bus idle or bus no response
* -EAGAIN device is still in bootloader
* if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
* -EINVAL device is in operational mode, but not supported by this driver
* 0 device is supported
*/
static int cyapa_check_is_operational(struct cyapa *cyapa)
{
int error;
error = cyapa_poll_state(cyapa, 4000);
if (error)
return error;
switch (cyapa->gen) {
case CYAPA_GEN5:
cyapa->ops = &cyapa_gen5_ops;
break;
case CYAPA_GEN3:
cyapa->ops = &cyapa_gen3_ops;
break;
default:
return -ENODEV;
}
error = cyapa->ops->operational_check(cyapa);
if (!error && cyapa_is_operational_mode(cyapa))
cyapa->operational = true;
else
cyapa->operational = false;
return error;
}
/*
* Returns 0 on device detected, negative errno on no device detected.
* And when the device is detected and opertaional, it will be reset to
* full power active mode automatically.
*/
static int cyapa_detect(struct cyapa *cyapa)
{
struct device *dev = &cyapa->client->dev;
int error;
error = cyapa_check_is_operational(cyapa);
if (error) {
if (error != -ETIMEDOUT && error != -ENODEV &&
cyapa_is_bootloader_mode(cyapa)) {
dev_warn(dev, "device detected but not operational\n");
return 0;
}
dev_err(dev, "no device detected: %d\n", error);
return error;
}
return 0;
}
static int cyapa_open(struct input_dev *input)
{
struct cyapa *cyapa = input_get_drvdata(input);
struct i2c_client *client = cyapa->client;
int error;
error = mutex_lock_interruptible(&cyapa->state_sync_lock);
if (error)
return error;
if (cyapa->operational) {
/*
* though failed to set active power mode,
* but still may be able to work in lower scan rate
* when in operational mode.
*/
error = cyapa->ops->set_power_mode(cyapa,
PWR_MODE_FULL_ACTIVE, 0);
if (error) {
dev_warn(&client->dev,
"set active power failed: %d\n", error);
goto out;
}
} else {
error = cyapa_reinitialize(cyapa);
if (error || !cyapa->operational) {
error = error ? error : -EAGAIN;
goto out;
}
}
enable_irq(client->irq);
out:
mutex_unlock(&cyapa->state_sync_lock);
return error;
}
static void cyapa_close(struct input_dev *input)
{
struct cyapa *cyapa = input_get_drvdata(input);
struct i2c_client *client = cyapa->client;
mutex_lock(&cyapa->state_sync_lock);
disable_irq(client->irq);
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
mutex_unlock(&cyapa->state_sync_lock);
}
static int cyapa_create_input_dev(struct cyapa *cyapa)
{
struct device *dev = &cyapa->client->dev;
struct input_dev *input;
int error;
if (!cyapa->physical_size_x || !cyapa->physical_size_y)
return -EINVAL;
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "failed to allocate memory for input device.\n");
return -ENOMEM;
}
input->name = CYAPA_NAME;
input->phys = cyapa->phys;
input->id.bustype = BUS_I2C;
input->id.version = 1;
input->id.product = 0; /* Means any product in eventcomm. */
input->dev.parent = &cyapa->client->dev;
input->open = cyapa_open;
input->close = cyapa_close;
input_set_drvdata(input, cyapa);
__set_bit(EV_ABS, input->evbit);
/* Finger position */
input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
0);
input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0);
if (cyapa->gen > CYAPA_GEN3) {
input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
/*
* Orientation is the angle between the vertical axis and
* the major axis of the contact ellipse.
* The range is -127 to 127.
* the positive direction is clockwise form the vertical axis.
* If the ellipse of contact degenerates into a circle,
* orientation is reported as 0.
*
* Also, for Gen5 trackpad the accurate of this orientation
* value is value + (-30 ~ 30).
*/
input_set_abs_params(input, ABS_MT_ORIENTATION,
-127, 127, 0, 0);
}
if (cyapa->gen >= CYAPA_GEN5) {
input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0);
}
input_abs_set_res(input, ABS_MT_POSITION_X,
cyapa->max_abs_x / cyapa->physical_size_x);
input_abs_set_res(input, ABS_MT_POSITION_Y,
cyapa->max_abs_y / cyapa->physical_size_y);
if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
__set_bit(BTN_LEFT, input->keybit);
if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
__set_bit(BTN_MIDDLE, input->keybit);
if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
__set_bit(BTN_RIGHT, input->keybit);
if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
/* Handle pointer emulation and unused slots in core */
error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
if (error) {
dev_err(dev, "failed to initialize MT slots: %d\n", error);
return error;
}
/* Register the device in input subsystem */
error = input_register_device(input);
if (error) {
dev_err(dev, "failed to register input device: %d\n", error);
return error;
}
cyapa->input = input;
return 0;
}
/*
* cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
*
* These are helper functions that convert to and from integer idle
* times and register settings to write to the PowerMode register.
* The trackpad supports between 20ms to 1000ms scan intervals.
* The time will be increased in increments of 10ms from 20ms to 100ms.
* From 100ms to 1000ms, time will be increased in increments of 20ms.
*
* When Idle_Time < 100, the format to convert Idle_Time to Idle_Command is:
* Idle_Command = Idle Time / 10;
* When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command is:
* Idle_Command = Idle Time / 20 + 5;
*/
u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time)
{
u16 encoded_time;
sleep_time = clamp_val(sleep_time, 20, 1000);
encoded_time = sleep_time < 100 ? sleep_time / 10 : sleep_time / 20 + 5;
return (encoded_time << 2) & PWR_MODE_MASK;
}
u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
{
u8 encoded_time = pwr_mode >> 2;
return (encoded_time < 10) ? encoded_time * 10
: (encoded_time - 5) * 20;
}
/* 0 on driver initialize and detected successfully, negative on failure. */
static int cyapa_initialize(struct cyapa *cyapa)
{
int error = 0;
cyapa->state = CYAPA_STATE_NO_DEVICE;
cyapa->gen = CYAPA_GEN_UNKNOWN;
mutex_init(&cyapa->state_sync_lock);
/*
* Set to hard code default, they will be updated with trackpad set
* default values after probe and initialized.
*/
cyapa->suspend_power_mode = PWR_MODE_SLEEP;
cyapa->suspend_sleep_time =
cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
/* ops.initialize() is aimed to prepare for module communications. */
error = cyapa_gen3_ops.initialize(cyapa);
if (!error)
error = cyapa_gen5_ops.initialize(cyapa);
if (error)
return error;
error = cyapa_detect(cyapa);
if (error)
return error;
/* Power down the device until we need it. */
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
return 0;
}
static int cyapa_reinitialize(struct cyapa *cyapa)
{
struct device *dev = &cyapa->client->dev;
struct input_dev *input = cyapa->input;
int error;
/* Avoid command failures when TP was in OFF state. */
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
error = cyapa_detect(cyapa);
if (error)
goto out;
if (!input && cyapa->operational) {
error = cyapa_create_input_dev(cyapa);
if (error) {
dev_err(dev, "create input_dev instance failed: %d\n",
error);
goto out;
}
}
out:
if (!input || !input->users) {
/* Reset to power OFF state to save power when no user open. */
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
}
return error;
}
static irqreturn_t cyapa_irq(int irq, void *dev_id)
{
struct cyapa *cyapa = dev_id;
struct device *dev = &cyapa->client->dev;
if (device_may_wakeup(dev))
pm_wakeup_event(dev, 0);
/* Interrupt event maybe cuased by host command to trackpad device. */
if (cyapa->ops->irq_cmd_handler(cyapa)) {
/*
* Interrupt event maybe from trackpad device input reporting.
*/
if (!cyapa->input) {
/*
* Still in probling or in firware image
* udpating or reading.
*/
cyapa->ops->sort_empty_output_data(cyapa,
NULL, NULL, NULL);
goto out;
}
if (!cyapa->operational || cyapa->ops->irq_handler(cyapa)) {
if (!mutex_trylock(&cyapa->state_sync_lock)) {
cyapa->ops->sort_empty_output_data(cyapa,
NULL, NULL, NULL);
goto out;
}
cyapa_reinitialize(cyapa);
mutex_unlock(&cyapa->state_sync_lock);
}
}
out:
return IRQ_HANDLED;
}
static int cyapa_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct device *dev = &client->dev;
struct cyapa *cyapa;
u8 adapter_func;
union i2c_smbus_data dummy;
int error;
adapter_func = cyapa_check_adapter_functionality(client);
if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
dev_err(dev, "not a supported I2C/SMBus adapter\n");
return -EIO;
}
/* Make sure there is something at this address */
if (i2c_smbus_xfer(client->adapter, client->addr, 0,
I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
return -ENODEV;
cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL);
if (!cyapa)
return -ENOMEM;
/* i2c isn't supported, use smbus */
if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
cyapa->smbus = true;
cyapa->client = client;
i2c_set_clientdata(client, cyapa);
sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
client->addr);
error = cyapa_initialize(cyapa);
if (error) {
dev_err(dev, "failed to detect and initialize tp device.\n");
return error;
}
error = devm_request_threaded_irq(dev, client->irq,
NULL, cyapa_irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"cyapa", cyapa);
if (error) {
dev_err(dev, "failed to request threaded irq: %d\n", error);
return error;
}
/* Disable IRQ until the device is opened */
disable_irq(client->irq);
/*
* Register the device in the input subsystem when it's operational.
* Otherwise, keep in this driver, so it can be be recovered or updated
* through the sysfs mode and update_fw interfaces by user or apps.
*/
if (cyapa->operational) {
error = cyapa_create_input_dev(cyapa);
if (error) {
dev_err(dev, "create input_dev instance failed: %d\n",
error);
return error;
}
}
return 0;
}
static int __maybe_unused cyapa_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cyapa *cyapa = i2c_get_clientdata(client);
u8 power_mode;
int error;
error = mutex_lock_interruptible(&cyapa->state_sync_lock);
if (error)
return error;
disable_irq(client->irq);
/*
* Set trackpad device to idle mode if wakeup is allowed,
* otherwise turn off.
*/
if (cyapa->operational) {
power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode
: PWR_MODE_OFF;
error = cyapa->ops->set_power_mode(cyapa, power_mode,
cyapa->suspend_sleep_time);
if (error)
dev_err(dev, "suspend set power mode failed: %d\n",
error);
}
if (device_may_wakeup(dev))
cyapa->irq_wake = (enable_irq_wake(client->irq) == 0);
mutex_unlock(&cyapa->state_sync_lock);
return 0;
}
static int __maybe_unused cyapa_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cyapa *cyapa = i2c_get_clientdata(client);
int error;
mutex_lock(&cyapa->state_sync_lock);
if (device_may_wakeup(dev) && cyapa->irq_wake) {
disable_irq_wake(client->irq);
cyapa->irq_wake = false;
}
error = cyapa_reinitialize(cyapa);
if (error)
dev_warn(dev, "failed to reinitialize TP device: %d\n", error);
enable_irq(client->irq);
mutex_unlock(&cyapa->state_sync_lock);
return 0;
}
static SIMPLE_DEV_PM_OPS(cyapa_pm_ops, cyapa_suspend, cyapa_resume);
static const struct i2c_device_id cyapa_id_table[] = {
{ "cyapa", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
static struct i2c_driver cyapa_driver = {
.driver = {
.name = "cyapa",
.owner = THIS_MODULE,
.pm = &cyapa_pm_ops,
},
.probe = cyapa_probe,
.id_table = cyapa_id_table,
};
module_i2c_driver(cyapa_driver);
MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
MODULE_LICENSE("GPL");
|