Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2// STMicroelectronics FTS Touchscreen device driver
3//
4// Copyright (c) 2017 Samsung Electronics Co., Ltd.
5// Copyright (c) 2017 Andi Shyti <andi@etezian.org>
6
7#include <linux/delay.h>
8#include <linux/i2c.h>
9#include <linux/input/mt.h>
10#include <linux/input/touchscreen.h>
11#include <linux/interrupt.h>
12#include <linux/irq.h>
13#include <linux/leds.h>
14#include <linux/module.h>
15#include <linux/pm_runtime.h>
16#include <linux/regulator/consumer.h>
17
18/* I2C commands */
19#define STMFTS_READ_INFO 0x80
20#define STMFTS_READ_STATUS 0x84
21#define STMFTS_READ_ONE_EVENT 0x85
22#define STMFTS_READ_ALL_EVENT 0x86
23#define STMFTS_LATEST_EVENT 0x87
24#define STMFTS_SLEEP_IN 0x90
25#define STMFTS_SLEEP_OUT 0x91
26#define STMFTS_MS_MT_SENSE_OFF 0x92
27#define STMFTS_MS_MT_SENSE_ON 0x93
28#define STMFTS_SS_HOVER_SENSE_OFF 0x94
29#define STMFTS_SS_HOVER_SENSE_ON 0x95
30#define STMFTS_MS_KEY_SENSE_OFF 0x9a
31#define STMFTS_MS_KEY_SENSE_ON 0x9b
32#define STMFTS_SYSTEM_RESET 0xa0
33#define STMFTS_CLEAR_EVENT_STACK 0xa1
34#define STMFTS_FULL_FORCE_CALIBRATION 0xa2
35#define STMFTS_MS_CX_TUNING 0xa3
36#define STMFTS_SS_CX_TUNING 0xa4
37
38/* events */
39#define STMFTS_EV_NO_EVENT 0x00
40#define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02
41#define STMFTS_EV_MULTI_TOUCH_ENTER 0x03
42#define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04
43#define STMFTS_EV_MULTI_TOUCH_MOTION 0x05
44#define STMFTS_EV_HOVER_ENTER 0x07
45#define STMFTS_EV_HOVER_LEAVE 0x08
46#define STMFTS_EV_HOVER_MOTION 0x09
47#define STMFTS_EV_KEY_STATUS 0x0e
48#define STMFTS_EV_ERROR 0x0f
49#define STMFTS_EV_CONTROLLER_READY 0x10
50#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11
51#define STMFTS_EV_STATUS 0x16
52#define STMFTS_EV_DEBUG 0xdb
53
54/* multi touch related event masks */
55#define STMFTS_MASK_EVENT_ID 0x0f
56#define STMFTS_MASK_TOUCH_ID 0xf0
57#define STMFTS_MASK_LEFT_EVENT 0x0f
58#define STMFTS_MASK_X_MSB 0x0f
59#define STMFTS_MASK_Y_LSB 0xf0
60
61/* key related event masks */
62#define STMFTS_MASK_KEY_NO_TOUCH 0x00
63#define STMFTS_MASK_KEY_MENU 0x01
64#define STMFTS_MASK_KEY_BACK 0x02
65
66#define STMFTS_EVENT_SIZE 8
67#define STMFTS_STACK_DEPTH 32
68#define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
69#define STMFTS_MAX_FINGERS 10
70#define STMFTS_DEV_NAME "stmfts"
71
72enum stmfts_regulators {
73 STMFTS_REGULATOR_VDD,
74 STMFTS_REGULATOR_AVDD,
75};
76
77struct stmfts_data {
78 struct i2c_client *client;
79 struct input_dev *input;
80 struct led_classdev led_cdev;
81 struct mutex mutex;
82
83 struct touchscreen_properties prop;
84
85 struct regulator_bulk_data regulators[2];
86
87 /*
88 * Presence of ledvdd will be used also to check
89 * whether the LED is supported.
90 */
91 struct regulator *ledvdd;
92
93 u16 chip_id;
94 u8 chip_ver;
95 u16 fw_ver;
96 u8 config_id;
97 u8 config_ver;
98
99 u8 data[STMFTS_DATA_MAX_SIZE];
100
101 struct completion cmd_done;
102
103 bool use_key;
104 bool led_status;
105 bool hover_enabled;
106 bool running;
107};
108
109static int stmfts_brightness_set(struct led_classdev *led_cdev,
110 enum led_brightness value)
111{
112 struct stmfts_data *sdata = container_of(led_cdev,
113 struct stmfts_data, led_cdev);
114 int err;
115
116 if (value != sdata->led_status && sdata->ledvdd) {
117 if (!value) {
118 regulator_disable(sdata->ledvdd);
119 } else {
120 err = regulator_enable(sdata->ledvdd);
121 if (err) {
122 dev_warn(&sdata->client->dev,
123 "failed to enable ledvdd regulator: %d\n",
124 err);
125 return err;
126 }
127 }
128 sdata->led_status = value;
129 }
130
131 return 0;
132}
133
134static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
135{
136 struct stmfts_data *sdata = container_of(led_cdev,
137 struct stmfts_data, led_cdev);
138
139 return !!regulator_is_enabled(sdata->ledvdd);
140}
141
142/*
143 * We can't simply use i2c_smbus_read_i2c_block_data because we
144 * need to read 256 bytes, which exceeds the 255-byte SMBus block limit.
145 */
146static int stmfts_read_events(struct stmfts_data *sdata)
147{
148 u8 cmd = STMFTS_READ_ALL_EVENT;
149 struct i2c_msg msgs[2] = {
150 {
151 .addr = sdata->client->addr,
152 .len = 1,
153 .buf = &cmd,
154 },
155 {
156 .addr = sdata->client->addr,
157 .flags = I2C_M_RD,
158 .len = STMFTS_DATA_MAX_SIZE,
159 .buf = sdata->data,
160 },
161 };
162 int ret;
163
164 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
165 if (ret < 0)
166 return ret;
167
168 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
169}
170
171static void stmfts_report_contact_event(struct stmfts_data *sdata,
172 const u8 event[])
173{
174 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
175 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
176 u16 y = (event[2] >> 4) | (event[3] << 4);
177 u8 maj = event[4];
178 u8 min = event[5];
179 u8 orientation = event[6];
180 u8 area = event[7];
181
182 input_mt_slot(sdata->input, slot_id);
183
184 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
185 input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
186 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
187 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
188 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
189 input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
190 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
191
192 input_sync(sdata->input);
193}
194
195static void stmfts_report_contact_release(struct stmfts_data *sdata,
196 const u8 event[])
197{
198 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
199
200 input_mt_slot(sdata->input, slot_id);
201 input_mt_report_slot_inactive(sdata->input);
202
203 input_sync(sdata->input);
204}
205
206static void stmfts_report_hover_event(struct stmfts_data *sdata,
207 const u8 event[])
208{
209 u16 x = (event[2] << 4) | (event[4] >> 4);
210 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
211 u8 z = event[5];
212
213 input_report_abs(sdata->input, ABS_X, x);
214 input_report_abs(sdata->input, ABS_Y, y);
215 input_report_abs(sdata->input, ABS_DISTANCE, z);
216
217 input_sync(sdata->input);
218}
219
220static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
221{
222 switch (event[2]) {
223 case 0:
224 input_report_key(sdata->input, KEY_BACK, 0);
225 input_report_key(sdata->input, KEY_MENU, 0);
226 break;
227
228 case STMFTS_MASK_KEY_BACK:
229 input_report_key(sdata->input, KEY_BACK, 1);
230 break;
231
232 case STMFTS_MASK_KEY_MENU:
233 input_report_key(sdata->input, KEY_MENU, 1);
234 break;
235
236 default:
237 dev_warn(&sdata->client->dev,
238 "unknown key event: %#02x\n", event[2]);
239 break;
240 }
241
242 input_sync(sdata->input);
243}
244
245static void stmfts_parse_events(struct stmfts_data *sdata)
246{
247 int i;
248
249 for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
250 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
251
252 switch (event[0]) {
253
254 case STMFTS_EV_CONTROLLER_READY:
255 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
256 case STMFTS_EV_STATUS:
257 complete(&sdata->cmd_done);
258 fallthrough;
259
260 case STMFTS_EV_NO_EVENT:
261 case STMFTS_EV_DEBUG:
262 return;
263 }
264
265 switch (event[0] & STMFTS_MASK_EVENT_ID) {
266
267 case STMFTS_EV_MULTI_TOUCH_ENTER:
268 case STMFTS_EV_MULTI_TOUCH_MOTION:
269 stmfts_report_contact_event(sdata, event);
270 break;
271
272 case STMFTS_EV_MULTI_TOUCH_LEAVE:
273 stmfts_report_contact_release(sdata, event);
274 break;
275
276 case STMFTS_EV_HOVER_ENTER:
277 case STMFTS_EV_HOVER_LEAVE:
278 case STMFTS_EV_HOVER_MOTION:
279 stmfts_report_hover_event(sdata, event);
280 break;
281
282 case STMFTS_EV_KEY_STATUS:
283 stmfts_report_key_event(sdata, event);
284 break;
285
286 case STMFTS_EV_ERROR:
287 dev_warn(&sdata->client->dev,
288 "error code: 0x%x%x%x%x%x%x",
289 event[6], event[5], event[4],
290 event[3], event[2], event[1]);
291 break;
292
293 default:
294 dev_err(&sdata->client->dev,
295 "unknown event %#02x\n", event[0]);
296 }
297 }
298}
299
300static irqreturn_t stmfts_irq_handler(int irq, void *dev)
301{
302 struct stmfts_data *sdata = dev;
303 int err;
304
305 guard(mutex)(&sdata->mutex);
306
307 err = stmfts_read_events(sdata);
308 if (unlikely(err))
309 dev_err(&sdata->client->dev,
310 "failed to read events: %d\n", err);
311 else
312 stmfts_parse_events(sdata);
313
314 return IRQ_HANDLED;
315}
316
317static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
318{
319 int err;
320
321 reinit_completion(&sdata->cmd_done);
322
323 err = i2c_smbus_write_byte(sdata->client, cmd);
324 if (err)
325 return err;
326
327 if (!wait_for_completion_timeout(&sdata->cmd_done,
328 msecs_to_jiffies(1000)))
329 return -ETIMEDOUT;
330
331 return 0;
332}
333
334static int stmfts_input_open(struct input_dev *dev)
335{
336 struct stmfts_data *sdata = input_get_drvdata(dev);
337 int err;
338
339 err = pm_runtime_resume_and_get(&sdata->client->dev);
340 if (err)
341 return err;
342
343 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
344 if (err) {
345 pm_runtime_put_sync(&sdata->client->dev);
346 return err;
347 }
348
349 scoped_guard(mutex, &sdata->mutex) {
350 sdata->running = true;
351
352 if (sdata->hover_enabled) {
353 err = i2c_smbus_write_byte(sdata->client,
354 STMFTS_SS_HOVER_SENSE_ON);
355 if (err)
356 dev_warn(&sdata->client->dev,
357 "failed to enable hover\n");
358 }
359 }
360
361 if (sdata->use_key) {
362 err = i2c_smbus_write_byte(sdata->client,
363 STMFTS_MS_KEY_SENSE_ON);
364 if (err)
365 /* I can still use only the touch screen */
366 dev_warn(&sdata->client->dev,
367 "failed to enable touchkey\n");
368 }
369
370 return 0;
371}
372
373static void stmfts_input_close(struct input_dev *dev)
374{
375 struct stmfts_data *sdata = input_get_drvdata(dev);
376 int err;
377
378 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
379 if (err)
380 dev_warn(&sdata->client->dev,
381 "failed to disable touchscreen: %d\n", err);
382
383 scoped_guard(mutex, &sdata->mutex) {
384 sdata->running = false;
385
386 if (sdata->hover_enabled) {
387 err = i2c_smbus_write_byte(sdata->client,
388 STMFTS_SS_HOVER_SENSE_OFF);
389 if (err)
390 dev_warn(&sdata->client->dev,
391 "failed to disable hover: %d\n", err);
392 }
393 }
394
395 if (sdata->use_key) {
396 err = i2c_smbus_write_byte(sdata->client,
397 STMFTS_MS_KEY_SENSE_OFF);
398 if (err)
399 dev_warn(&sdata->client->dev,
400 "failed to disable touchkey: %d\n", err);
401 }
402
403 pm_runtime_put_sync(&sdata->client->dev);
404}
405
406static ssize_t stmfts_sysfs_chip_id(struct device *dev,
407 struct device_attribute *attr, char *buf)
408{
409 struct stmfts_data *sdata = dev_get_drvdata(dev);
410
411 return sysfs_emit(buf, "%#x\n", sdata->chip_id);
412}
413
414static ssize_t stmfts_sysfs_chip_version(struct device *dev,
415 struct device_attribute *attr, char *buf)
416{
417 struct stmfts_data *sdata = dev_get_drvdata(dev);
418
419 return sysfs_emit(buf, "%u\n", sdata->chip_ver);
420}
421
422static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
423 struct device_attribute *attr, char *buf)
424{
425 struct stmfts_data *sdata = dev_get_drvdata(dev);
426
427 return sysfs_emit(buf, "%u\n", sdata->fw_ver);
428}
429
430static ssize_t stmfts_sysfs_config_id(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct stmfts_data *sdata = dev_get_drvdata(dev);
434
435 return sysfs_emit(buf, "%#x\n", sdata->config_id);
436}
437
438static ssize_t stmfts_sysfs_config_version(struct device *dev,
439 struct device_attribute *attr, char *buf)
440{
441 struct stmfts_data *sdata = dev_get_drvdata(dev);
442
443 return sysfs_emit(buf, "%u\n", sdata->config_ver);
444}
445
446static ssize_t stmfts_sysfs_read_status(struct device *dev,
447 struct device_attribute *attr, char *buf)
448{
449 struct stmfts_data *sdata = dev_get_drvdata(dev);
450 u8 status[4];
451 int err;
452
453 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
454 sizeof(status), status);
455 if (err)
456 return err;
457
458 return sysfs_emit(buf, "%#02x\n", status[0]);
459}
460
461static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
462 struct device_attribute *attr, char *buf)
463{
464 struct stmfts_data *sdata = dev_get_drvdata(dev);
465
466 return sysfs_emit(buf, "%u\n", sdata->hover_enabled);
467}
468
469static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
470 struct device_attribute *attr,
471 const char *buf, size_t len)
472{
473 struct stmfts_data *sdata = dev_get_drvdata(dev);
474 unsigned long value;
475 bool hover;
476 int err;
477
478 if (kstrtoul(buf, 0, &value))
479 return -EINVAL;
480
481 hover = !!value;
482
483 guard(mutex)(&sdata->mutex);
484
485 if (hover != sdata->hover_enabled) {
486 if (sdata->running) {
487 err = i2c_smbus_write_byte(sdata->client,
488 value ? STMFTS_SS_HOVER_SENSE_ON :
489 STMFTS_SS_HOVER_SENSE_OFF);
490 if (err)
491 return err;
492 }
493
494 sdata->hover_enabled = hover;
495 }
496
497 return len;
498}
499
500static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
501static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
502static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
503static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
504static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
505static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
506static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
507 stmfts_sysfs_hover_enable_write);
508
509static struct attribute *stmfts_sysfs_attrs[] = {
510 &dev_attr_chip_id.attr,
511 &dev_attr_chip_version.attr,
512 &dev_attr_fw_ver.attr,
513 &dev_attr_config_id.attr,
514 &dev_attr_config_version.attr,
515 &dev_attr_status.attr,
516 &dev_attr_hover_enable.attr,
517 NULL
518};
519ATTRIBUTE_GROUPS(stmfts_sysfs);
520
521static int stmfts_power_on(struct stmfts_data *sdata)
522{
523 int err;
524 u8 reg[8];
525
526 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
527 sdata->regulators);
528 if (err)
529 return err;
530
531 /*
532 * The datasheet does not specify the power on time, but considering
533 * that the reset time is < 10ms, I sleep 20ms to be sure
534 */
535 msleep(20);
536
537 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
538 sizeof(reg), reg);
539 if (err < 0)
540 return err;
541 if (err != sizeof(reg))
542 return -EIO;
543
544 sdata->chip_id = be16_to_cpup((__be16 *)®[6]);
545 sdata->chip_ver = reg[0];
546 sdata->fw_ver = be16_to_cpup((__be16 *)®[2]);
547 sdata->config_id = reg[4];
548 sdata->config_ver = reg[5];
549
550 enable_irq(sdata->client->irq);
551
552 msleep(50);
553
554 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
555 if (err)
556 return err;
557
558 err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
559 if (err)
560 return err;
561
562 /* optional tuning */
563 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
564 if (err)
565 dev_warn(&sdata->client->dev,
566 "failed to perform mutual auto tune: %d\n", err);
567
568 /* optional tuning */
569 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
570 if (err)
571 dev_warn(&sdata->client->dev,
572 "failed to perform self auto tune: %d\n", err);
573
574 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
575 if (err)
576 return err;
577
578 /*
579 * At this point no one is using the touchscreen
580 * and I don't really care about the return value
581 */
582 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
583
584 return 0;
585}
586
587static void stmfts_power_off(void *data)
588{
589 struct stmfts_data *sdata = data;
590
591 disable_irq(sdata->client->irq);
592 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
593 sdata->regulators);
594}
595
596static int stmfts_enable_led(struct stmfts_data *sdata)
597{
598 int err;
599
600 /* get the regulator for powering the leds on */
601 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
602 if (IS_ERR(sdata->ledvdd))
603 return PTR_ERR(sdata->ledvdd);
604
605 sdata->led_cdev.name = STMFTS_DEV_NAME;
606 sdata->led_cdev.max_brightness = LED_ON;
607 sdata->led_cdev.brightness = LED_OFF;
608 sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
609 sdata->led_cdev.brightness_get = stmfts_brightness_get;
610
611 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
612 if (err) {
613 devm_regulator_put(sdata->ledvdd);
614 return err;
615 }
616
617 return 0;
618}
619
620static int stmfts_probe(struct i2c_client *client)
621{
622 int err;
623 struct stmfts_data *sdata;
624
625 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
626 I2C_FUNC_SMBUS_BYTE_DATA |
627 I2C_FUNC_SMBUS_I2C_BLOCK))
628 return -ENODEV;
629
630 sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
631 if (!sdata)
632 return -ENOMEM;
633
634 i2c_set_clientdata(client, sdata);
635
636 sdata->client = client;
637 mutex_init(&sdata->mutex);
638 init_completion(&sdata->cmd_done);
639
640 sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
641 sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
642 err = devm_regulator_bulk_get(&client->dev,
643 ARRAY_SIZE(sdata->regulators),
644 sdata->regulators);
645 if (err)
646 return err;
647
648 sdata->input = devm_input_allocate_device(&client->dev);
649 if (!sdata->input)
650 return -ENOMEM;
651
652 sdata->input->name = STMFTS_DEV_NAME;
653 sdata->input->id.bustype = BUS_I2C;
654 sdata->input->open = stmfts_input_open;
655 sdata->input->close = stmfts_input_close;
656
657 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
658 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
659 touchscreen_parse_properties(sdata->input, true, &sdata->prop);
660
661 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
662 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
663 input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
664 input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
665 input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
666
667 sdata->use_key = device_property_read_bool(&client->dev,
668 "touch-key-connected");
669 if (sdata->use_key) {
670 input_set_capability(sdata->input, EV_KEY, KEY_MENU);
671 input_set_capability(sdata->input, EV_KEY, KEY_BACK);
672 }
673
674 err = input_mt_init_slots(sdata->input,
675 STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
676 if (err)
677 return err;
678
679 input_set_drvdata(sdata->input, sdata);
680
681 /*
682 * stmfts_power_on expects interrupt to be disabled, but
683 * at this point the device is still off and I do not trust
684 * the status of the irq line that can generate some spurious
685 * interrupts. To be on the safe side it's better to not enable
686 * the interrupts during their request.
687 */
688 err = devm_request_threaded_irq(&client->dev, client->irq,
689 NULL, stmfts_irq_handler,
690 IRQF_ONESHOT | IRQF_NO_AUTOEN,
691 "stmfts_irq", sdata);
692 if (err)
693 return err;
694
695 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
696
697 err = stmfts_power_on(sdata);
698 if (err)
699 return err;
700
701 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
702 if (err)
703 return err;
704
705 err = input_register_device(sdata->input);
706 if (err)
707 return err;
708
709 if (sdata->use_key) {
710 err = stmfts_enable_led(sdata);
711 if (err) {
712 /*
713 * Even if the LEDs have failed to be initialized and
714 * used in the driver, I can still use the device even
715 * without LEDs. The ledvdd regulator pointer will be
716 * used as a flag.
717 */
718 dev_warn(&client->dev, "unable to use touchkey leds\n");
719 sdata->ledvdd = NULL;
720 }
721 }
722
723 pm_runtime_enable(&client->dev);
724 device_enable_async_suspend(&client->dev);
725
726 return 0;
727}
728
729static void stmfts_remove(struct i2c_client *client)
730{
731 pm_runtime_disable(&client->dev);
732}
733
734static int stmfts_runtime_suspend(struct device *dev)
735{
736 struct stmfts_data *sdata = dev_get_drvdata(dev);
737 int ret;
738
739 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
740 if (ret)
741 dev_warn(dev, "failed to suspend device: %d\n", ret);
742
743 return ret;
744}
745
746static int stmfts_runtime_resume(struct device *dev)
747{
748 struct stmfts_data *sdata = dev_get_drvdata(dev);
749 int ret;
750
751 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
752 if (ret)
753 dev_err(dev, "failed to resume device: %d\n", ret);
754
755 return ret;
756}
757
758static int stmfts_suspend(struct device *dev)
759{
760 struct stmfts_data *sdata = dev_get_drvdata(dev);
761
762 stmfts_power_off(sdata);
763
764 return 0;
765}
766
767static int stmfts_resume(struct device *dev)
768{
769 struct stmfts_data *sdata = dev_get_drvdata(dev);
770
771 return stmfts_power_on(sdata);
772}
773
774static const struct dev_pm_ops stmfts_pm_ops = {
775 SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
776 RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
777};
778
779#ifdef CONFIG_OF
780static const struct of_device_id stmfts_of_match[] = {
781 { .compatible = "st,stmfts", },
782 { },
783};
784MODULE_DEVICE_TABLE(of, stmfts_of_match);
785#endif
786
787static const struct i2c_device_id stmfts_id[] = {
788 { "stmfts" },
789 { }
790};
791MODULE_DEVICE_TABLE(i2c, stmfts_id);
792
793static struct i2c_driver stmfts_driver = {
794 .driver = {
795 .name = STMFTS_DEV_NAME,
796 .dev_groups = stmfts_sysfs_groups,
797 .of_match_table = of_match_ptr(stmfts_of_match),
798 .pm = pm_ptr(&stmfts_pm_ops),
799 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
800 },
801 .probe = stmfts_probe,
802 .remove = stmfts_remove,
803 .id_table = stmfts_id,
804};
805
806module_i2c_driver(stmfts_driver);
807
808MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
809MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
810MODULE_LICENSE("GPL v2");