blob: c72662c979e79f99277138543815b4ac0674ce83 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +08001/*
2 * Copyright (c) 2017 Samsung Electronics Co., Ltd.
3 * Author: Andi Shyti <andi.shyti@samsung.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * STMicroelectronics FTS Touchscreen device driver
10 */
11
12#include <linux/delay.h>
13#include <linux/i2c.h>
14#include <linux/input/mt.h>
15#include <linux/input/touchscreen.h>
16#include <linux/interrupt.h>
17#include <linux/irq.h>
18#include <linux/leds.h>
19#include <linux/module.h>
20#include <linux/pm_runtime.h>
21#include <linux/regulator/consumer.h>
22
23/* I2C commands */
24#define STMFTS_READ_INFO 0x80
25#define STMFTS_READ_STATUS 0x84
26#define STMFTS_READ_ONE_EVENT 0x85
27#define STMFTS_READ_ALL_EVENT 0x86
28#define STMFTS_LATEST_EVENT 0x87
29#define STMFTS_SLEEP_IN 0x90
30#define STMFTS_SLEEP_OUT 0x91
31#define STMFTS_MS_MT_SENSE_OFF 0x92
32#define STMFTS_MS_MT_SENSE_ON 0x93
33#define STMFTS_SS_HOVER_SENSE_OFF 0x94
34#define STMFTS_SS_HOVER_SENSE_ON 0x95
35#define STMFTS_MS_KEY_SENSE_OFF 0x9a
36#define STMFTS_MS_KEY_SENSE_ON 0x9b
37#define STMFTS_SYSTEM_RESET 0xa0
38#define STMFTS_CLEAR_EVENT_STACK 0xa1
39#define STMFTS_FULL_FORCE_CALIBRATION 0xa2
40#define STMFTS_MS_CX_TUNING 0xa3
41#define STMFTS_SS_CX_TUNING 0xa4
42
43/* events */
44#define STMFTS_EV_NO_EVENT 0x00
45#define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02
46#define STMFTS_EV_MULTI_TOUCH_ENTER 0x03
47#define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04
48#define STMFTS_EV_MULTI_TOUCH_MOTION 0x05
49#define STMFTS_EV_HOVER_ENTER 0x07
50#define STMFTS_EV_HOVER_LEAVE 0x08
51#define STMFTS_EV_HOVER_MOTION 0x09
52#define STMFTS_EV_KEY_STATUS 0x0e
53#define STMFTS_EV_ERROR 0x0f
54#define STMFTS_EV_CONTROLLER_READY 0x10
55#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11
56#define STMFTS_EV_STATUS 0x16
57#define STMFTS_EV_DEBUG 0xdb
58
59/* multi touch related event masks */
60#define STMFTS_MASK_EVENT_ID 0x0f
61#define STMFTS_MASK_TOUCH_ID 0xf0
62#define STMFTS_MASK_LEFT_EVENT 0x0f
63#define STMFTS_MASK_X_MSB 0x0f
64#define STMFTS_MASK_Y_LSB 0xf0
65
66/* key related event masks */
67#define STMFTS_MASK_KEY_NO_TOUCH 0x00
68#define STMFTS_MASK_KEY_MENU 0x01
69#define STMFTS_MASK_KEY_BACK 0x02
70
71#define STMFTS_EVENT_SIZE 8
72#define STMFTS_STACK_DEPTH 32
73#define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
74#define STMFTS_MAX_FINGERS 10
75#define STMFTS_DEV_NAME "stmfts"
76
77enum stmfts_regulators {
78 STMFTS_REGULATOR_VDD,
79 STMFTS_REGULATOR_AVDD,
80};
81
82struct stmfts_data {
83 struct i2c_client *client;
84 struct input_dev *input;
85 struct led_classdev led_cdev;
86 struct mutex mutex;
87
88 struct touchscreen_properties prop;
89
90 struct regulator_bulk_data regulators[2];
91
92 /*
93 * Presence of ledvdd will be used also to check
94 * whether the LED is supported.
95 */
96 struct regulator *ledvdd;
97
98 u16 chip_id;
99 u8 chip_ver;
100 u16 fw_ver;
101 u8 config_id;
102 u8 config_ver;
103
104 u8 data[STMFTS_DATA_MAX_SIZE];
105
106 struct completion cmd_done;
107
108 bool use_key;
109 bool led_status;
110 bool hover_enabled;
111 bool running;
112};
113
114static int stmfts_brightness_set(struct led_classdev *led_cdev,
115 enum led_brightness value)
116{
117 struct stmfts_data *sdata = container_of(led_cdev,
118 struct stmfts_data, led_cdev);
119 int err;
120
121 if (value != sdata->led_status && sdata->ledvdd) {
122 if (!value) {
123 regulator_disable(sdata->ledvdd);
124 } else {
125 err = regulator_enable(sdata->ledvdd);
126 if (err) {
127 dev_warn(&sdata->client->dev,
128 "failed to disable ledvdd regulator: %d\n",
129 err);
130 return err;
131 }
132 }
133 sdata->led_status = value;
134 }
135
136 return 0;
137}
138
139static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
140{
141 struct stmfts_data *sdata = container_of(led_cdev,
142 struct stmfts_data, led_cdev);
143
144 return !!regulator_is_enabled(sdata->ledvdd);
145}
146
147/*
148 * We can't simply use i2c_smbus_read_i2c_block_data because we
149 * need to read more than 255 bytes (
150 */
151static int stmfts_read_events(struct stmfts_data *sdata)
152{
153 u8 cmd = STMFTS_READ_ALL_EVENT;
154 struct i2c_msg msgs[2] = {
155 {
156 .addr = sdata->client->addr,
157 .len = 1,
158 .buf = &cmd,
159 },
160 {
161 .addr = sdata->client->addr,
162 .flags = I2C_M_RD,
163 .len = STMFTS_DATA_MAX_SIZE,
164 .buf = sdata->data,
165 },
166 };
167 int ret;
168
169 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
170 if (ret < 0)
171 return ret;
172
173 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
174}
175
176static void stmfts_report_contact_event(struct stmfts_data *sdata,
177 const u8 event[])
178{
179 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
180 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
181 u16 y = (event[2] >> 4) | (event[3] << 4);
182 u8 maj = event[4];
183 u8 min = event[5];
184 u8 orientation = event[6];
185 u8 area = event[7];
186
187 input_mt_slot(sdata->input, slot_id);
188
189 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
190 input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
191 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
192 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
193 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
194 input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
195 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
196
197 input_sync(sdata->input);
198}
199
200static void stmfts_report_contact_release(struct stmfts_data *sdata,
201 const u8 event[])
202{
203 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
204
205 input_mt_slot(sdata->input, slot_id);
206 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
207
208 input_sync(sdata->input);
209}
210
211static void stmfts_report_hover_event(struct stmfts_data *sdata,
212 const u8 event[])
213{
214 u16 x = (event[2] << 4) | (event[4] >> 4);
215 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
216 u8 z = event[5];
217
218 input_report_abs(sdata->input, ABS_X, x);
219 input_report_abs(sdata->input, ABS_Y, y);
220 input_report_abs(sdata->input, ABS_DISTANCE, z);
221
222 input_sync(sdata->input);
223}
224
225static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
226{
227 switch (event[2]) {
228 case 0:
229 input_report_key(sdata->input, KEY_BACK, 0);
230 input_report_key(sdata->input, KEY_MENU, 0);
231 break;
232
233 case STMFTS_MASK_KEY_BACK:
234 input_report_key(sdata->input, KEY_BACK, 1);
235 break;
236
237 case STMFTS_MASK_KEY_MENU:
238 input_report_key(sdata->input, KEY_MENU, 1);
239 break;
240
241 default:
242 dev_warn(&sdata->client->dev,
243 "unknown key event: %#02x\n", event[2]);
244 break;
245 }
246
247 input_sync(sdata->input);
248}
249
250static void stmfts_parse_events(struct stmfts_data *sdata)
251{
252 int i;
253
254 for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
255 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
256
257 switch (event[0]) {
258
259 case STMFTS_EV_CONTROLLER_READY:
260 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
261 case STMFTS_EV_STATUS:
262 complete(&sdata->cmd_done);
263 /* fall through */
264
265 case STMFTS_EV_NO_EVENT:
266 case STMFTS_EV_DEBUG:
267 return;
268 }
269
270 switch (event[0] & STMFTS_MASK_EVENT_ID) {
271
272 case STMFTS_EV_MULTI_TOUCH_ENTER:
273 case STMFTS_EV_MULTI_TOUCH_MOTION:
274 stmfts_report_contact_event(sdata, event);
275 break;
276
277 case STMFTS_EV_MULTI_TOUCH_LEAVE:
278 stmfts_report_contact_release(sdata, event);
279 break;
280
281 case STMFTS_EV_HOVER_ENTER:
282 case STMFTS_EV_HOVER_LEAVE:
283 case STMFTS_EV_HOVER_MOTION:
284 stmfts_report_hover_event(sdata, event);
285 break;
286
287 case STMFTS_EV_KEY_STATUS:
288 stmfts_report_key_event(sdata, event);
289 break;
290
291 case STMFTS_EV_ERROR:
292 dev_warn(&sdata->client->dev,
293 "error code: 0x%x%x%x%x%x%x",
294 event[6], event[5], event[4],
295 event[3], event[2], event[1]);
296 break;
297
298 default:
299 dev_err(&sdata->client->dev,
300 "unknown event %#02x\n", event[0]);
301 }
302 }
303}
304
305static irqreturn_t stmfts_irq_handler(int irq, void *dev)
306{
307 struct stmfts_data *sdata = dev;
308 int err;
309
310 mutex_lock(&sdata->mutex);
311
312 err = stmfts_read_events(sdata);
313 if (unlikely(err))
314 dev_err(&sdata->client->dev,
315 "failed to read events: %d\n", err);
316 else
317 stmfts_parse_events(sdata);
318
319 mutex_unlock(&sdata->mutex);
320 return IRQ_HANDLED;
321}
322
323static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
324{
325 int err;
326
327 reinit_completion(&sdata->cmd_done);
328
329 err = i2c_smbus_write_byte(sdata->client, cmd);
330 if (err)
331 return err;
332
333 if (!wait_for_completion_timeout(&sdata->cmd_done,
334 msecs_to_jiffies(1000)))
335 return -ETIMEDOUT;
336
337 return 0;
338}
339
340static int stmfts_input_open(struct input_dev *dev)
341{
342 struct stmfts_data *sdata = input_get_drvdata(dev);
343 int err;
344
345 err = pm_runtime_get_sync(&sdata->client->dev);
346 if (err < 0)
347 return err;
348
349 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
350 if (err)
351 return err;
352
353 mutex_lock(&sdata->mutex);
354 sdata->running = true;
355
356 if (sdata->hover_enabled) {
357 err = i2c_smbus_write_byte(sdata->client,
358 STMFTS_SS_HOVER_SENSE_ON);
359 if (err)
360 dev_warn(&sdata->client->dev,
361 "failed to enable hover\n");
362 }
363 mutex_unlock(&sdata->mutex);
364
365 if (sdata->use_key) {
366 err = i2c_smbus_write_byte(sdata->client,
367 STMFTS_MS_KEY_SENSE_ON);
368 if (err)
369 /* I can still use only the touch screen */
370 dev_warn(&sdata->client->dev,
371 "failed to enable touchkey\n");
372 }
373
374 return 0;
375}
376
377static void stmfts_input_close(struct input_dev *dev)
378{
379 struct stmfts_data *sdata = input_get_drvdata(dev);
380 int err;
381
382 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
383 if (err)
384 dev_warn(&sdata->client->dev,
385 "failed to disable touchscreen: %d\n", err);
386
387 mutex_lock(&sdata->mutex);
388
389 sdata->running = false;
390
391 if (sdata->hover_enabled) {
392 err = i2c_smbus_write_byte(sdata->client,
393 STMFTS_SS_HOVER_SENSE_OFF);
394 if (err)
395 dev_warn(&sdata->client->dev,
396 "failed to disable hover: %d\n", err);
397 }
398 mutex_unlock(&sdata->mutex);
399
400 if (sdata->use_key) {
401 err = i2c_smbus_write_byte(sdata->client,
402 STMFTS_MS_KEY_SENSE_OFF);
403 if (err)
404 dev_warn(&sdata->client->dev,
405 "failed to disable touchkey: %d\n", err);
406 }
407
408 pm_runtime_put_sync(&sdata->client->dev);
409}
410
411static ssize_t stmfts_sysfs_chip_id(struct device *dev,
412 struct device_attribute *attr, char *buf)
413{
414 struct stmfts_data *sdata = dev_get_drvdata(dev);
415
416 return sprintf(buf, "%#x\n", sdata->chip_id);
417}
418
419static ssize_t stmfts_sysfs_chip_version(struct device *dev,
420 struct device_attribute *attr, char *buf)
421{
422 struct stmfts_data *sdata = dev_get_drvdata(dev);
423
424 return sprintf(buf, "%u\n", sdata->chip_ver);
425}
426
427static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
428 struct device_attribute *attr, char *buf)
429{
430 struct stmfts_data *sdata = dev_get_drvdata(dev);
431
432 return sprintf(buf, "%u\n", sdata->fw_ver);
433}
434
435static ssize_t stmfts_sysfs_config_id(struct device *dev,
436 struct device_attribute *attr, char *buf)
437{
438 struct stmfts_data *sdata = dev_get_drvdata(dev);
439
440 return sprintf(buf, "%#x\n", sdata->config_id);
441}
442
443static ssize_t stmfts_sysfs_config_version(struct device *dev,
444 struct device_attribute *attr, char *buf)
445{
446 struct stmfts_data *sdata = dev_get_drvdata(dev);
447
448 return sprintf(buf, "%u\n", sdata->config_ver);
449}
450
451static ssize_t stmfts_sysfs_read_status(struct device *dev,
452 struct device_attribute *attr, char *buf)
453{
454 struct stmfts_data *sdata = dev_get_drvdata(dev);
455 u8 status[4];
456 int err;
457
458 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
459 sizeof(status), status);
460 if (err)
461 return err;
462
463 return sprintf(buf, "%#02x\n", status[0]);
464}
465
466static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
467 struct device_attribute *attr, char *buf)
468{
469 struct stmfts_data *sdata = dev_get_drvdata(dev);
470
471 return sprintf(buf, "%u\n", sdata->hover_enabled);
472}
473
474static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
475 struct device_attribute *attr,
476 const char *buf, size_t len)
477{
478 struct stmfts_data *sdata = dev_get_drvdata(dev);
479 unsigned long value;
480 int err = 0;
481
482 if (kstrtoul(buf, 0, &value))
483 return -EINVAL;
484
485 mutex_lock(&sdata->mutex);
486
487 if (value & sdata->hover_enabled)
488 goto out;
489
490 if (sdata->running)
491 err = i2c_smbus_write_byte(sdata->client,
492 value ? STMFTS_SS_HOVER_SENSE_ON :
493 STMFTS_SS_HOVER_SENSE_OFF);
494
495 if (!err)
496 sdata->hover_enabled = !!value;
497
498out:
499 mutex_unlock(&sdata->mutex);
500
501 return len;
502}
503
504static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
505static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
506static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
507static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
508static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
509static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
510static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
511 stmfts_sysfs_hover_enable_write);
512
513static struct attribute *stmfts_sysfs_attrs[] = {
514 &dev_attr_chip_id.attr,
515 &dev_attr_chip_version.attr,
516 &dev_attr_fw_ver.attr,
517 &dev_attr_config_id.attr,
518 &dev_attr_config_version.attr,
519 &dev_attr_status.attr,
520 &dev_attr_hover_enable.attr,
521 NULL
522};
523
524static struct attribute_group stmfts_attribute_group = {
525 .attrs = stmfts_sysfs_attrs
526};
527
528static int stmfts_power_on(struct stmfts_data *sdata)
529{
530 int err;
531 u8 reg[8];
532
533 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
534 sdata->regulators);
535 if (err)
536 return err;
537
538 /*
539 * The datasheet does not specify the power on time, but considering
540 * that the reset time is < 10ms, I sleep 20ms to be sure
541 */
542 msleep(20);
543
544 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
545 sizeof(reg), reg);
546 if (err < 0)
547 return err;
548 if (err != sizeof(reg))
549 return -EIO;
550
551 sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
552 sdata->chip_ver = reg[0];
553 sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
554 sdata->config_id = reg[4];
555 sdata->config_ver = reg[5];
556
557 enable_irq(sdata->client->irq);
558
559 msleep(50);
560
561 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
562 if (err)
563 return err;
564
565 err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
566 if (err)
567 return err;
568
569 /* optional tuning */
570 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
571 if (err)
572 dev_warn(&sdata->client->dev,
573 "failed to perform mutual auto tune: %d\n", err);
574
575 /* optional tuning */
576 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
577 if (err)
578 dev_warn(&sdata->client->dev,
579 "failed to perform self auto tune: %d\n", err);
580
581 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
582 if (err)
583 return err;
584
585 /*
586 * At this point no one is using the touchscreen
587 * and I don't really care about the return value
588 */
589 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
590
591 return 0;
592}
593
594static void stmfts_power_off(void *data)
595{
596 struct stmfts_data *sdata = data;
597
598 disable_irq(sdata->client->irq);
599 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
600 sdata->regulators);
601}
602
603/* This function is void because I don't want to prevent using the touch key
604 * only because the LEDs don't get registered
605 */
606static int stmfts_enable_led(struct stmfts_data *sdata)
607{
608 int err;
609
610 /* get the regulator for powering the leds on */
611 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
612 if (IS_ERR(sdata->ledvdd))
613 return PTR_ERR(sdata->ledvdd);
614
615 sdata->led_cdev.name = STMFTS_DEV_NAME;
616 sdata->led_cdev.max_brightness = LED_ON;
617 sdata->led_cdev.brightness = LED_OFF;
618 sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
619 sdata->led_cdev.brightness_get = stmfts_brightness_get;
620
621 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
622 if (err) {
623 devm_regulator_put(sdata->ledvdd);
624 return err;
625 }
626
627 return 0;
628}
629
630static int stmfts_probe(struct i2c_client *client,
631 const struct i2c_device_id *id)
632{
633 int err;
634 struct stmfts_data *sdata;
635
636 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
637 I2C_FUNC_SMBUS_BYTE_DATA |
638 I2C_FUNC_SMBUS_I2C_BLOCK))
639 return -ENODEV;
640
641 sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
642 if (!sdata)
643 return -ENOMEM;
644
645 i2c_set_clientdata(client, sdata);
646
647 sdata->client = client;
648 mutex_init(&sdata->mutex);
649 init_completion(&sdata->cmd_done);
650
651 sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
652 sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
653 err = devm_regulator_bulk_get(&client->dev,
654 ARRAY_SIZE(sdata->regulators),
655 sdata->regulators);
656 if (err)
657 return err;
658
659 sdata->input = devm_input_allocate_device(&client->dev);
660 if (!sdata->input)
661 return -ENOMEM;
662
663 sdata->input->name = STMFTS_DEV_NAME;
664 sdata->input->id.bustype = BUS_I2C;
665 sdata->input->open = stmfts_input_open;
666 sdata->input->close = stmfts_input_close;
667
668 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
669 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
670 touchscreen_parse_properties(sdata->input, true, &sdata->prop);
671
672 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
673 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
674 input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
675 input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
676 input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
677
678 sdata->use_key = device_property_read_bool(&client->dev,
679 "touch-key-connected");
680 if (sdata->use_key) {
681 input_set_capability(sdata->input, EV_KEY, KEY_MENU);
682 input_set_capability(sdata->input, EV_KEY, KEY_BACK);
683 }
684
685 err = input_mt_init_slots(sdata->input,
686 STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
687 if (err)
688 return err;
689
690 input_set_drvdata(sdata->input, sdata);
691
692 /*
693 * stmfts_power_on expects interrupt to be disabled, but
694 * at this point the device is still off and I do not trust
695 * the status of the irq line that can generate some spurious
696 * interrupts. To be on the safe side it's better to not enable
697 * the interrupts during their request.
698 */
699 irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
700 err = devm_request_threaded_irq(&client->dev, client->irq,
701 NULL, stmfts_irq_handler,
702 IRQF_ONESHOT,
703 "stmfts_irq", sdata);
704 if (err)
705 return err;
706
707 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
708
709 err = stmfts_power_on(sdata);
710 if (err)
711 return err;
712
713 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
714 if (err)
715 return err;
716
717 err = input_register_device(sdata->input);
718 if (err)
719 return err;
720
721 if (sdata->use_key) {
722 err = stmfts_enable_led(sdata);
723 if (err) {
724 /*
725 * Even if the LEDs have failed to be initialized and
726 * used in the driver, I can still use the device even
727 * without LEDs. The ledvdd regulator pointer will be
728 * used as a flag.
729 */
730 dev_warn(&client->dev, "unable to use touchkey leds\n");
731 sdata->ledvdd = NULL;
732 }
733 }
734
735 err = sysfs_create_group(&sdata->client->dev.kobj,
736 &stmfts_attribute_group);
737 if (err)
738 return err;
739
740 pm_runtime_enable(&client->dev);
741
742 return 0;
743}
744
745static int stmfts_remove(struct i2c_client *client)
746{
747 pm_runtime_disable(&client->dev);
748 sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);
749
750 return 0;
751}
752
753static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
754{
755 struct stmfts_data *sdata = dev_get_drvdata(dev);
756 int ret;
757
758 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
759 if (ret)
760 dev_warn(dev, "failed to suspend device: %d\n", ret);
761
762 return ret;
763}
764
765static int __maybe_unused stmfts_runtime_resume(struct device *dev)
766{
767 struct stmfts_data *sdata = dev_get_drvdata(dev);
768 int ret;
769
770 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
771 if (ret)
772 dev_err(dev, "failed to resume device: %d\n", ret);
773
774 return ret;
775}
776
777static int __maybe_unused stmfts_suspend(struct device *dev)
778{
779 struct stmfts_data *sdata = dev_get_drvdata(dev);
780
781 stmfts_power_off(sdata);
782
783 return 0;
784}
785
786static int __maybe_unused stmfts_resume(struct device *dev)
787{
788 struct stmfts_data *sdata = dev_get_drvdata(dev);
789
790 return stmfts_power_on(sdata);
791}
792
793static const struct dev_pm_ops stmfts_pm_ops = {
794 SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
795 SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
796};
797
798#ifdef CONFIG_OF
799static const struct of_device_id stmfts_of_match[] = {
800 { .compatible = "st,stmfts", },
801 { },
802};
803MODULE_DEVICE_TABLE(of, stmfts_of_match);
804#endif
805
806static const struct i2c_device_id stmfts_id[] = {
807 { "stmfts", 0 },
808 { },
809};
810MODULE_DEVICE_TABLE(i2c, stmfts_id);
811
812static struct i2c_driver stmfts_driver = {
813 .driver = {
814 .name = STMFTS_DEV_NAME,
815 .of_match_table = of_match_ptr(stmfts_of_match),
816 .pm = &stmfts_pm_ops,
817 },
818 .probe = stmfts_probe,
819 .remove = stmfts_remove,
820 .id_table = stmfts_id,
821};
822
823module_i2c_driver(stmfts_driver);
824
825MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
826MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
827MODULE_LICENSE("GPL v2");