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Merge tag 'drm-misc-fixes-2017-07-20' of git://anongit.freedesktop.org/git/drm-misc...
[linux-2.6-block.git] / drivers / input / touchscreen / stmfts.c
CommitLineData
78bcac7b
AS		 1/*
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 void 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 return;
123
124 if (!value) {
125 regulator_disable(sdata->ledvdd);
126 } else {
127 err = regulator_enable(sdata->ledvdd);
128 if (err)
129 dev_warn(&sdata->client->dev,
130 "failed to disable ledvdd regulator: %d\n",
131 err);
132 }
133
134 sdata->led_status = value;
135}
136
137static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
138{
139 struct stmfts_data *sdata = container_of(led_cdev,
140 struct stmfts_data, led_cdev);
141
142 return !!regulator_is_enabled(sdata->ledvdd);
143}
144
145/*
146 * We can't simply use i2c_smbus_read_i2c_block_data because we
147 * need to read more than 255 bytes (
148 */
149static int stmfts_read_events(struct stmfts_data *sdata)
150{
151 u8 cmd = STMFTS_READ_ALL_EVENT;
152 struct i2c_msg msgs[2] = {
153 {
154 .addr = sdata->client->addr,
155 .len = 1,
156 .buf = &cmd,
157 },
158 {
159 .addr = sdata->client->addr,
160 .flags = I2C_M_RD,
161 .len = STMFTS_DATA_MAX_SIZE,
162 .buf = sdata->data,
163 },
164 };
165 int ret;
166
167 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
168 if (ret < 0)
169 return ret;
170
171 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
172}
173
174static void stmfts_report_contact_event(struct stmfts_data *sdata,
175 const u8 event[])
176{
177 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
178 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
179 u16 y = (event[2] >> 4) | (event[3] << 4);
180 u8 maj = event[4];
181 u8 min = event[5];
182 u8 orientation = event[6];
183 u8 area = event[7];
184
185 input_mt_slot(sdata->input, slot_id);
186
187 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
188 input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
189 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
190 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
191 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
192 input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
193 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
194
195 input_sync(sdata->input);
196}
197
198static void stmfts_report_contact_release(struct stmfts_data *sdata,
199 const u8 event[])
200{
201 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
202
203 input_mt_slot(sdata->input, slot_id);
204 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
205
206 input_sync(sdata->input);
207}
208
209static void stmfts_report_hover_event(struct stmfts_data *sdata,
210 const u8 event[])
211{
212 u16 x = (event[2] << 4) | (event[4] >> 4);
213 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
214 u8 z = event[5];
215
216 input_report_abs(sdata->input, ABS_X, x);
217 input_report_abs(sdata->input, ABS_Y, y);
218 input_report_abs(sdata->input, ABS_DISTANCE, z);
219
220 input_sync(sdata->input);
221}
222
223static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
224{
225 switch (event[2]) {
226 case 0:
227 input_report_key(sdata->input, KEY_BACK, 0);
228 input_report_key(sdata->input, KEY_MENU, 0);
229 break;
230
231 case STMFTS_MASK_KEY_BACK:
232 input_report_key(sdata->input, KEY_BACK, 1);
233 break;
234
235 case STMFTS_MASK_KEY_MENU:
236 input_report_key(sdata->input, KEY_MENU, 1);
237 break;
238
239 default:
240 dev_warn(&sdata->client->dev,
241 "unknown key event: %#02x\n", event[2]);
242 break;
243 }
244
245 input_sync(sdata->input);
246}
247
248static void stmfts_parse_events(struct stmfts_data *sdata)
249{
250 int i;
251
252 for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
253 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
254
255 switch (event[0]) {
256
257 case STMFTS_EV_CONTROLLER_READY:
258 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
259 case STMFTS_EV_STATUS:
260 complete(&sdata->cmd_done);
261 /* fall through */
262
263 case STMFTS_EV_NO_EVENT:
264 case STMFTS_EV_DEBUG:
265 return;
266 }
267
268 switch (event[0] & STMFTS_MASK_EVENT_ID) {
269
270 case STMFTS_EV_MULTI_TOUCH_ENTER:
271 case STMFTS_EV_MULTI_TOUCH_MOTION:
272 stmfts_report_contact_event(sdata, event);
273 break;
274
275 case STMFTS_EV_MULTI_TOUCH_LEAVE:
276 stmfts_report_contact_release(sdata, event);
277 break;
278
279 case STMFTS_EV_HOVER_ENTER:
280 case STMFTS_EV_HOVER_LEAVE:
281 case STMFTS_EV_HOVER_MOTION:
282 stmfts_report_hover_event(sdata, event);
283 break;
284
285 case STMFTS_EV_KEY_STATUS:
286 stmfts_report_key_event(sdata, event);
287 break;
288
289 case STMFTS_EV_ERROR:
290 dev_warn(&sdata->client->dev,
291 "error code: 0x%x%x%x%x%x%x",
292 event[6], event[5], event[4],
293 event[3], event[2], event[1]);
294 break;
295
296 default:
297 dev_err(&sdata->client->dev,
298 "unknown event %#02x\n", event[0]);
299 }
300 }
301}
302
303static irqreturn_t stmfts_irq_handler(int irq, void *dev)
304{
305 struct stmfts_data *sdata = dev;
306 int err;
307
308 mutex_lock(&sdata->mutex);
309
310 err = stmfts_read_events(sdata);
311 if (unlikely(err))
312 dev_err(&sdata->client->dev,
313 "failed to read events: %d\n", err);
314 else
315 stmfts_parse_events(sdata);
316
317 mutex_unlock(&sdata->mutex);
318 return IRQ_HANDLED;
319}
320
321static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
322{
323 int err;
324
325 reinit_completion(&sdata->cmd_done);
326
327 err = i2c_smbus_write_byte(sdata->client, cmd);
328 if (err)
329 return err;
330
331 if (!wait_for_completion_timeout(&sdata->cmd_done,
332 msecs_to_jiffies(1000)))
333 return -ETIMEDOUT;
334
335 return 0;
336}
337
338static int stmfts_input_open(struct input_dev *dev)
339{
340 struct stmfts_data *sdata = input_get_drvdata(dev);
341 int err;
342
343 err = pm_runtime_get_sync(&sdata->client->dev);
344 if (err < 0)
345 return err;
346
347 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
348 if (err)
349 return err;
350
351 mutex_lock(&sdata->mutex);
352 sdata->running = true;
353
354 if (sdata->hover_enabled) {
355 err = i2c_smbus_write_byte(sdata->client,
356 STMFTS_SS_HOVER_SENSE_ON);
357 if (err)
358 dev_warn(&sdata->client->dev,
359 "failed to enable hover\n");
360 }
361 mutex_unlock(&sdata->mutex);
362
363 if (sdata->use_key) {
364 err = i2c_smbus_write_byte(sdata->client,
365 STMFTS_MS_KEY_SENSE_ON);
366 if (err)
367 /* I can still use only the touch screen */
368 dev_warn(&sdata->client->dev,
369 "failed to enable touchkey\n");
370 }
371
372 return 0;
373}
374
375static void stmfts_input_close(struct input_dev *dev)
376{
377 struct stmfts_data *sdata = input_get_drvdata(dev);
378 int err;
379
380 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
381 if (err)
382 dev_warn(&sdata->client->dev,
383 "failed to disable touchscreen: %d\n", err);
384
385 mutex_lock(&sdata->mutex);
386
387 sdata->running = false;
388
389 if (sdata->hover_enabled) {
390 err = i2c_smbus_write_byte(sdata->client,
391 STMFTS_SS_HOVER_SENSE_OFF);
392 if (err)
393 dev_warn(&sdata->client->dev,
394 "failed to disable hover: %d\n", err);
395 }
396 mutex_unlock(&sdata->mutex);
397
398 if (sdata->use_key) {
399 err = i2c_smbus_write_byte(sdata->client,
400 STMFTS_MS_KEY_SENSE_OFF);
401 if (err)
402 dev_warn(&sdata->client->dev,
403 "failed to disable touchkey: %d\n", err);
404 }
405
406 pm_runtime_put_sync(&sdata->client->dev);
407}
408
409static ssize_t stmfts_sysfs_chip_id(struct device *dev,
410 struct device_attribute *attr, char *buf)
411{
412 struct stmfts_data *sdata = dev_get_drvdata(dev);
413
414 return sprintf(buf, "%#x\n", sdata->chip_id);
415}
416
417static ssize_t stmfts_sysfs_chip_version(struct device *dev,
418 struct device_attribute *attr, char *buf)
419{
420 struct stmfts_data *sdata = dev_get_drvdata(dev);
421
422 return sprintf(buf, "%u\n", sdata->chip_ver);
423}
424
425static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
426 struct device_attribute *attr, char *buf)
427{
428 struct stmfts_data *sdata = dev_get_drvdata(dev);
429
430 return sprintf(buf, "%u\n", sdata->fw_ver);
431}
432
433static ssize_t stmfts_sysfs_config_id(struct device *dev,
434 struct device_attribute *attr, char *buf)
435{
436 struct stmfts_data *sdata = dev_get_drvdata(dev);
437
438 return sprintf(buf, "%#x\n", sdata->config_id);
439}
440
441static ssize_t stmfts_sysfs_config_version(struct device *dev,
442 struct device_attribute *attr, char *buf)
443{
444 struct stmfts_data *sdata = dev_get_drvdata(dev);
445
446 return sprintf(buf, "%u\n", sdata->config_ver);
447}
448
449static ssize_t stmfts_sysfs_read_status(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
452 struct stmfts_data *sdata = dev_get_drvdata(dev);
453 u8 status[4];
454 int err;
455
456 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
457 sizeof(status), status);
458 if (err)
459 return err;
460
461 return sprintf(buf, "%#02x\n", status[0]);
462}
463
464static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
465 struct device_attribute *attr, char *buf)
466{
467 struct stmfts_data *sdata = dev_get_drvdata(dev);
468
469 return sprintf(buf, "%u\n", sdata->hover_enabled);
470}
471
472static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
473 struct device_attribute *attr,
474 const char *buf, size_t len)
475{
476 struct stmfts_data *sdata = dev_get_drvdata(dev);
477 unsigned long value;
478 int err = 0;
479
480 if (kstrtoul(buf, 0, &value))
481 return -EINVAL;
482
483 mutex_lock(&sdata->mutex);
484
485 if (value & sdata->hover_enabled)
486 goto out;
487
488 if (sdata->running)
489 err = i2c_smbus_write_byte(sdata->client,
490 value ? STMFTS_SS_HOVER_SENSE_ON :
491 STMFTS_SS_HOVER_SENSE_OFF);
492
493 if (!err)
494 sdata->hover_enabled = !!value;
495
496out:
497 mutex_unlock(&sdata->mutex);
498
499 return len;
500}
501
502static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
503static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
504static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
505static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
506static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
507static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
508static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
509 stmfts_sysfs_hover_enable_write);
510
511static struct attribute *stmfts_sysfs_attrs[] = {
512 &dev_attr_chip_id.attr,
513 &dev_attr_chip_version.attr,
514 &dev_attr_fw_ver.attr,
515 &dev_attr_config_id.attr,
516 &dev_attr_config_version.attr,
517 &dev_attr_status.attr,
518 &dev_attr_hover_enable.attr,
519 NULL
520};
521
522static struct attribute_group stmfts_attribute_group = {
523 .attrs = stmfts_sysfs_attrs
524};
525
526static int stmfts_power_on(struct stmfts_data *sdata)
527{
528 int err;
529 u8 reg[8];
530
531 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
532 sdata->regulators);
533 if (err)
534 return err;
535
536 /*
537 * The datasheet does not specify the power on time, but considering
538 * that the reset time is < 10ms, I sleep 20ms to be sure
539 */
540 msleep(20);
541
542 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
543 sizeof(reg), reg);
544 if (err < 0)
545 return err;
546 if (err != sizeof(reg))
547 return -EIO;
548
549 sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
550 sdata->chip_ver = reg[0];
551 sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
552 sdata->config_id = reg[4];
553 sdata->config_ver = reg[5];
554
555 enable_irq(sdata->client->irq);
556
557 msleep(50);
558
559 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
560 if (err)
561 return err;
562
563 err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
564 if (err)
565 return err;
566
567 /* optional tuning */
568 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
569 if (err)
570 dev_warn(&sdata->client->dev,
571 "failed to perform mutual auto tune: %d\n", err);
572
573 /* optional tuning */
574 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
575 if (err)
576 dev_warn(&sdata->client->dev,
577 "failed to perform self auto tune: %d\n", err);
578
579 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
580 if (err)
581 return err;
582
583 /*
584 * At this point no one is using the touchscreen
585 * and I don't really care about the return value
586 */
587 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
588
589 return 0;
590}
591
592static void stmfts_power_off(void *data)
593{
594 struct stmfts_data *sdata = data;
595
596 disable_irq(sdata->client->irq);
597 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
598 sdata->regulators);
599}
600
601/* This function is void because I don't want to prevent using the touch key
602 * only because the LEDs don't get registered
603 */
604static int stmfts_enable_led(struct stmfts_data *sdata)
605{
606 int err;
607
608 /* get the regulator for powering the leds on */
609 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
610 if (IS_ERR(sdata->ledvdd))
611 return PTR_ERR(sdata->ledvdd);
612
613 sdata->led_cdev.name = STMFTS_DEV_NAME;
614 sdata->led_cdev.max_brightness = LED_ON;
615 sdata->led_cdev.brightness = LED_OFF;
616 sdata->led_cdev.brightness_set = stmfts_brightness_set;
617 sdata->led_cdev.brightness_get = stmfts_brightness_get;
618
619 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
620 if (err) {
621 devm_regulator_put(sdata->ledvdd);
622 return err;
623 }
624
625 return 0;
626}
627
628static int stmfts_probe(struct i2c_client *client,
629 const struct i2c_device_id *id)
630{
631 int err;
632 struct stmfts_data *sdata;
633
634 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
635 I2C_FUNC_SMBUS_BYTE_DATA |
636 I2C_FUNC_SMBUS_I2C_BLOCK))
637 return -ENODEV;
638
639 sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
640 if (!sdata)
641 return -ENOMEM;
642
643 i2c_set_clientdata(client, sdata);
644
645 sdata->client = client;
646 mutex_init(&sdata->mutex);
647 init_completion(&sdata->cmd_done);
648
649 sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
650 sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
651 err = devm_regulator_bulk_get(&client->dev,
652 ARRAY_SIZE(sdata->regulators),
653 sdata->regulators);
654 if (err)
655 return err;
656
657 sdata->input = devm_input_allocate_device(&client->dev);
658 if (!sdata->input)
659 return -ENOMEM;
660
661 sdata->input->name = STMFTS_DEV_NAME;
662 sdata->input->id.bustype = BUS_I2C;
663 sdata->input->open = stmfts_input_open;
664 sdata->input->close = stmfts_input_close;
665
666 touchscreen_parse_properties(sdata->input, true, &sdata->prop);
667
668 input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0,
669 sdata->prop.max_x, 0, 0);
670 input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0,
671 sdata->prop.max_y, 0, 0);
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 err = devm_request_threaded_irq(&client->dev, client->irq,
693 NULL, stmfts_irq_handler,
694 IRQF_ONESHOT,
695 "stmfts_irq", sdata);
696 if (err)
697 return err;
698
699 /* stmfts_power_on expects interrupt to be disabled */
700 disable_irq(client->irq);
701
702 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
703
704 err = stmfts_power_on(sdata);
705 if (err)
706 return err;
707
708 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
709 if (err)
710 return err;
711
712 err = input_register_device(sdata->input);
713 if (err)
714 return err;
715
716 if (sdata->use_key) {
717 err = stmfts_enable_led(sdata);
718 if (err) {
719 /*
720 * Even if the LEDs have failed to be initialized and
721 * used in the driver, I can still use the device even
722 * without LEDs. The ledvdd regulator pointer will be
723 * used as a flag.
724 */
725 dev_warn(&client->dev, "unable to use touchkey leds\n");
726 sdata->ledvdd = NULL;
727 }
728 }
729
730 err = sysfs_create_group(&sdata->client->dev.kobj,
731 &stmfts_attribute_group);
732 if (err)
733 return err;
734
735 pm_runtime_enable(&client->dev);
736
737 return 0;
738}
739
740static int stmfts_remove(struct i2c_client *client)
741{
742 pm_runtime_disable(&client->dev);
743 sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);
744
745 return 0;
746}
747
d4c9354b 748static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
78bcac7b
AS		 749{
750 struct stmfts_data *sdata = dev_get_drvdata(dev);
751 int ret;
752
753 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
754 if (ret)
755 dev_warn(dev, "failed to suspend device: %d\n", ret);
756
757 return ret;
758}
759
d4c9354b 760static int __maybe_unused stmfts_runtime_resume(struct device *dev)
78bcac7b
AS		 761{
762 struct stmfts_data *sdata = dev_get_drvdata(dev);
763 int ret;
764
765 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
766 if (ret)
767 dev_err(dev, "failed to resume device: %d\n", ret);
768
769 return ret;
770}
771
772static int __maybe_unused stmfts_suspend(struct device *dev)
773{
774 struct stmfts_data *sdata = dev_get_drvdata(dev);
775
776 stmfts_power_off(sdata);
777
778 return 0;
779}
780
781static int __maybe_unused stmfts_resume(struct device *dev)
782{
783 struct stmfts_data *sdata = dev_get_drvdata(dev);
784
785 return stmfts_power_on(sdata);
786}
787
788static const struct dev_pm_ops stmfts_pm_ops = {
789 SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
790 SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
791};
792
793#ifdef CONFIG_OF
794static const struct of_device_id stmfts_of_match[] = {
795 { .compatible = "st,stmfts", },
796 { },
797};
798MODULE_DEVICE_TABLE(of, stmfts_of_match);
799#endif
800
801static const struct i2c_device_id stmfts_id[] = {
802 { "stmfts", 0 },
803 { },
804};
805MODULE_DEVICE_TABLE(i2c, stmfts_id);
806
807static struct i2c_driver stmfts_driver = {
808 .driver = {
809 .name = STMFTS_DEV_NAME,
810 .of_match_table = of_match_ptr(stmfts_of_match),
811 .pm = &stmfts_pm_ops,
812 },
813 .probe = stmfts_probe,
814 .remove = stmfts_remove,
815 .id_table = stmfts_id,
816};
817
818module_i2c_driver(stmfts_driver);
819
820MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
821MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
822MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)