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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 void 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 return;
118
119 if (!value) {
120 regulator_disable(sdata->ledvdd);
121 } else {
122 err = regulator_enable(sdata->ledvdd);
123 if (err)
124 dev_warn(&sdata->client->dev,
125 "failed to disable ledvdd regulator: %d\n",
126 err);
127 }
128
129 sdata->led_status = value;
130}
131
132static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
133{
134 struct stmfts_data *sdata = container_of(led_cdev,
135 struct stmfts_data, led_cdev);
136
137 return !!regulator_is_enabled(sdata->ledvdd);
138}
139
140/*
141 * We can't simply use i2c_smbus_read_i2c_block_data because we
142 * need to read more than 255 bytes (
143 */
144static int stmfts_read_events(struct stmfts_data *sdata)
145{
146 u8 cmd = STMFTS_READ_ALL_EVENT;
147 struct i2c_msg msgs[2] = {
148 {
149 .addr = sdata->client->addr,
150 .len = 1,
151 .buf = &cmd,
152 },
153 {
154 .addr = sdata->client->addr,
155 .flags = I2C_M_RD,
156 .len = STMFTS_DATA_MAX_SIZE,
157 .buf = sdata->data,
158 },
159 };
160 int ret;
161
162 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
163 if (ret < 0)
164 return ret;
165
166 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
167}
168
169static void stmfts_report_contact_event(struct stmfts_data *sdata,
170 const u8 event[])
171{
172 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
173 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
174 u16 y = (event[2] >> 4) | (event[3] << 4);
175 u8 maj = event[4];
176 u8 min = event[5];
177 u8 orientation = event[6];
178 u8 area = event[7];
179
180 input_mt_slot(sdata->input, slot_id);
181
182 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
183 input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
184 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
185 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
186 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
187 input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
188 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
189
190 input_sync(sdata->input);
191}
192
193static void stmfts_report_contact_release(struct stmfts_data *sdata,
194 const u8 event[])
195{
196 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
197
198 input_mt_slot(sdata->input, slot_id);
199 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
200
201 input_sync(sdata->input);
202}
203
204static void stmfts_report_hover_event(struct stmfts_data *sdata,
205 const u8 event[])
206{
207 u16 x = (event[2] << 4) | (event[4] >> 4);
208 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
209 u8 z = event[5];
210
211 input_report_abs(sdata->input, ABS_X, x);
212 input_report_abs(sdata->input, ABS_Y, y);
213 input_report_abs(sdata->input, ABS_DISTANCE, z);
214
215 input_sync(sdata->input);
216}
217
218static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
219{
220 switch (event[2]) {
221 case 0:
222 input_report_key(sdata->input, KEY_BACK, 0);
223 input_report_key(sdata->input, KEY_MENU, 0);
224 break;
225
226 case STMFTS_MASK_KEY_BACK:
227 input_report_key(sdata->input, KEY_BACK, 1);
228 break;
229
230 case STMFTS_MASK_KEY_MENU:
231 input_report_key(sdata->input, KEY_MENU, 1);
232 break;
233
234 default:
235 dev_warn(&sdata->client->dev,
236 "unknown key event: %#02x\n", event[2]);
237 break;
238 }
239
240 input_sync(sdata->input);
241}
242
243static void stmfts_parse_events(struct stmfts_data *sdata)
244{
245 int i;
246
247 for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
248 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
249
250 switch (event[0]) {
251
252 case STMFTS_EV_CONTROLLER_READY:
253 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
254 case STMFTS_EV_STATUS:
255 complete(&sdata->cmd_done);
256 /* fall through */
257
258 case STMFTS_EV_NO_EVENT:
259 case STMFTS_EV_DEBUG:
260 return;
261 }
262
263 switch (event[0] & STMFTS_MASK_EVENT_ID) {
264
265 case STMFTS_EV_MULTI_TOUCH_ENTER:
266 case STMFTS_EV_MULTI_TOUCH_MOTION:
267 stmfts_report_contact_event(sdata, event);
268 break;
269
270 case STMFTS_EV_MULTI_TOUCH_LEAVE:
271 stmfts_report_contact_release(sdata, event);
272 break;
273
274 case STMFTS_EV_HOVER_ENTER:
275 case STMFTS_EV_HOVER_LEAVE:
276 case STMFTS_EV_HOVER_MOTION:
277 stmfts_report_hover_event(sdata, event);
278 break;
279
280 case STMFTS_EV_KEY_STATUS:
281 stmfts_report_key_event(sdata, event);
282 break;
283
284 case STMFTS_EV_ERROR:
285 dev_warn(&sdata->client->dev,
286 "error code: 0x%x%x%x%x%x%x",
287 event[6], event[5], event[4],
288 event[3], event[2], event[1]);
289 break;
290
291 default:
292 dev_err(&sdata->client->dev,
293 "unknown event %#02x\n", event[0]);
294 }
295 }
296}
297
298static irqreturn_t stmfts_irq_handler(int irq, void *dev)
299{
300 struct stmfts_data *sdata = dev;
301 int err;
302
303 mutex_lock(&sdata->mutex);
304
305 err = stmfts_read_events(sdata);
306 if (unlikely(err))
307 dev_err(&sdata->client->dev,
308 "failed to read events: %d\n", err);
309 else
310 stmfts_parse_events(sdata);
311
312 mutex_unlock(&sdata->mutex);
313 return IRQ_HANDLED;
314}
315
316static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
317{
318 int err;
319
320 reinit_completion(&sdata->cmd_done);
321
322 err = i2c_smbus_write_byte(sdata->client, cmd);
323 if (err)
324 return err;
325
326 if (!wait_for_completion_timeout(&sdata->cmd_done,
327 msecs_to_jiffies(1000)))
328 return -ETIMEDOUT;
329
330 return 0;
331}
332
333static int stmfts_input_open(struct input_dev *dev)
334{
335 struct stmfts_data *sdata = input_get_drvdata(dev);
336 int err;
337
338 err = pm_runtime_get_sync(&sdata->client->dev);
339 if (err < 0)
340 return err;
341
342 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
343 if (err)
344 return err;
345
346 mutex_lock(&sdata->mutex);
347 sdata->running = true;
348
349 if (sdata->hover_enabled) {
350 err = i2c_smbus_write_byte(sdata->client,
351 STMFTS_SS_HOVER_SENSE_ON);
352 if (err)
353 dev_warn(&sdata->client->dev,
354 "failed to enable hover\n");
355 }
356 mutex_unlock(&sdata->mutex);
357
358 if (sdata->use_key) {
359 err = i2c_smbus_write_byte(sdata->client,
360 STMFTS_MS_KEY_SENSE_ON);
361 if (err)
362 /* I can still use only the touch screen */
363 dev_warn(&sdata->client->dev,
364 "failed to enable touchkey\n");
365 }
366
367 return 0;
368}
369
370static void stmfts_input_close(struct input_dev *dev)
371{
372 struct stmfts_data *sdata = input_get_drvdata(dev);
373 int err;
374
375 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
376 if (err)
377 dev_warn(&sdata->client->dev,
378 "failed to disable touchscreen: %d\n", err);
379
380 mutex_lock(&sdata->mutex);
381
382 sdata->running = false;
383
384 if (sdata->hover_enabled) {
385 err = i2c_smbus_write_byte(sdata->client,
386 STMFTS_SS_HOVER_SENSE_OFF);
387 if (err)
388 dev_warn(&sdata->client->dev,
389 "failed to disable hover: %d\n", err);
390 }
391 mutex_unlock(&sdata->mutex);
392
393 if (sdata->use_key) {
394 err = i2c_smbus_write_byte(sdata->client,
395 STMFTS_MS_KEY_SENSE_OFF);
396 if (err)
397 dev_warn(&sdata->client->dev,
398 "failed to disable touchkey: %d\n", err);
399 }
400
401 pm_runtime_put_sync(&sdata->client->dev);
402}
403
404static ssize_t stmfts_sysfs_chip_id(struct device *dev,
405 struct device_attribute *attr, char *buf)
406{
407 struct stmfts_data *sdata = dev_get_drvdata(dev);
408
409 return sprintf(buf, "%#x\n", sdata->chip_id);
410}
411
412static ssize_t stmfts_sysfs_chip_version(struct device *dev,
413 struct device_attribute *attr, char *buf)
414{
415 struct stmfts_data *sdata = dev_get_drvdata(dev);
416
417 return sprintf(buf, "%u\n", sdata->chip_ver);
418}
419
420static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
423 struct stmfts_data *sdata = dev_get_drvdata(dev);
424
425 return sprintf(buf, "%u\n", sdata->fw_ver);
426}
427
428static ssize_t stmfts_sysfs_config_id(struct device *dev,
429 struct device_attribute *attr, char *buf)
430{
431 struct stmfts_data *sdata = dev_get_drvdata(dev);
432
433 return sprintf(buf, "%#x\n", sdata->config_id);
434}
435
436static ssize_t stmfts_sysfs_config_version(struct device *dev,
437 struct device_attribute *attr, char *buf)
438{
439 struct stmfts_data *sdata = dev_get_drvdata(dev);
440
441 return sprintf(buf, "%u\n", sdata->config_ver);
442}
443
444static ssize_t stmfts_sysfs_read_status(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
447 struct stmfts_data *sdata = dev_get_drvdata(dev);
448 u8 status[4];
449 int err;
450
451 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
452 sizeof(status), status);
453 if (err)
454 return err;
455
456 return sprintf(buf, "%#02x\n", status[0]);
457}
458
459static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
460 struct device_attribute *attr, char *buf)
461{
462 struct stmfts_data *sdata = dev_get_drvdata(dev);
463
464 return sprintf(buf, "%u\n", sdata->hover_enabled);
465}
466
467static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
468 struct device_attribute *attr,
469 const char *buf, size_t len)
470{
471 struct stmfts_data *sdata = dev_get_drvdata(dev);
472 unsigned long value;
473 int err = 0;
474
475 if (kstrtoul(buf, 0, &value))
476 return -EINVAL;
477
478 mutex_lock(&sdata->mutex);
479
480 if (value & sdata->hover_enabled)
481 goto out;
482
483 if (sdata->running)
484 err = i2c_smbus_write_byte(sdata->client,
485 value ? STMFTS_SS_HOVER_SENSE_ON :
486 STMFTS_SS_HOVER_SENSE_OFF);
487
488 if (!err)
489 sdata->hover_enabled = !!value;
490
491out:
492 mutex_unlock(&sdata->mutex);
493
494 return len;
495}
496
497static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
498static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
499static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
500static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
501static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
502static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
503static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
504 stmfts_sysfs_hover_enable_write);
505
506static struct attribute *stmfts_sysfs_attrs[] = {
507 &dev_attr_chip_id.attr,
508 &dev_attr_chip_version.attr,
509 &dev_attr_fw_ver.attr,
510 &dev_attr_config_id.attr,
511 &dev_attr_config_version.attr,
512 &dev_attr_status.attr,
513 &dev_attr_hover_enable.attr,
514 NULL
515};
516
517static struct attribute_group stmfts_attribute_group = {
518 .attrs = stmfts_sysfs_attrs
519};
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
596/* This function is void because I don't want to prevent using the touch key
597 * only because the LEDs don't get registered
598 */
599static int stmfts_enable_led(struct stmfts_data *sdata)
600{
601 int err;
602
603 /* get the regulator for powering the leds on */
604 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
605 if (IS_ERR(sdata->ledvdd))
606 return PTR_ERR(sdata->ledvdd);
607
608 sdata->led_cdev.name = STMFTS_DEV_NAME;
609 sdata->led_cdev.max_brightness = LED_ON;
610 sdata->led_cdev.brightness = LED_OFF;
611 sdata->led_cdev.brightness_set = stmfts_brightness_set;
612 sdata->led_cdev.brightness_get = stmfts_brightness_get;
613
614 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
615 if (err) {
616 devm_regulator_put(sdata->ledvdd);
617 return err;
618 }
619
620 return 0;
621}
622
623static int stmfts_probe(struct i2c_client *client,
624 const struct i2c_device_id *id)
625{
626 int err;
627 struct stmfts_data *sdata;
628
629 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
630 I2C_FUNC_SMBUS_BYTE_DATA |
631 I2C_FUNC_SMBUS_I2C_BLOCK))
632 return -ENODEV;
633
634 sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
635 if (!sdata)
636 return -ENOMEM;
637
638 i2c_set_clientdata(client, sdata);
639
640 sdata->client = client;
641 mutex_init(&sdata->mutex);
642 init_completion(&sdata->cmd_done);
643
644 sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
645 sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
646 err = devm_regulator_bulk_get(&client->dev,
647 ARRAY_SIZE(sdata->regulators),
648 sdata->regulators);
649 if (err)
650 return err;
651
652 sdata->input = devm_input_allocate_device(&client->dev);
653 if (!sdata->input)
654 return -ENOMEM;
655
656 sdata->input->name = STMFTS_DEV_NAME;
657 sdata->input->id.bustype = BUS_I2C;
658 sdata->input->open = stmfts_input_open;
659 sdata->input->close = stmfts_input_close;
660
661 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
662 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
663 touchscreen_parse_properties(sdata->input, true, &sdata->prop);
664
665 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
666 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
667 input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
668 input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
669 input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
670
671 sdata->use_key = device_property_read_bool(&client->dev,
672 "touch-key-connected");
673 if (sdata->use_key) {
674 input_set_capability(sdata->input, EV_KEY, KEY_MENU);
675 input_set_capability(sdata->input, EV_KEY, KEY_BACK);
676 }
677
678 err = input_mt_init_slots(sdata->input,
679 STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
680 if (err)
681 return err;
682
683 input_set_drvdata(sdata->input, sdata);
684
685 /*
686 * stmfts_power_on expects interrupt to be disabled, but
687 * at this point the device is still off and I do not trust
688 * the status of the irq line that can generate some spurious
689 * interrupts. To be on the safe side it's better to not enable
690 * the interrupts during their request.
691 */
692 irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
693 err = devm_request_threaded_irq(&client->dev, client->irq,
694 NULL, stmfts_irq_handler,
695 IRQF_ONESHOT,
696 "stmfts_irq", sdata);
697 if (err)
698 return err;
699
700 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
701
702 err = stmfts_power_on(sdata);
703 if (err)
704 return err;
705
706 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
707 if (err)
708 return err;
709
710 err = input_register_device(sdata->input);
711 if (err)
712 return err;
713
714 if (sdata->use_key) {
715 err = stmfts_enable_led(sdata);
716 if (err) {
717 /*
718 * Even if the LEDs have failed to be initialized and
719 * used in the driver, I can still use the device even
720 * without LEDs. The ledvdd regulator pointer will be
721 * used as a flag.
722 */
723 dev_warn(&client->dev, "unable to use touchkey leds\n");
724 sdata->ledvdd = NULL;
725 }
726 }
727
728 err = devm_device_add_group(&client->dev, &stmfts_attribute_group);
729 if (err)
730 return err;
731
732 pm_runtime_enable(&client->dev);
733 device_enable_async_suspend(&client->dev);
734
735 return 0;
736}
737
738static int stmfts_remove(struct i2c_client *client)
739{
740 pm_runtime_disable(&client->dev);
741
742 return 0;
743}
744
745static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
746{
747 struct stmfts_data *sdata = dev_get_drvdata(dev);
748 int ret;
749
750 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
751 if (ret)
752 dev_warn(dev, "failed to suspend device: %d\n", ret);
753
754 return ret;
755}
756
757static int __maybe_unused stmfts_runtime_resume(struct device *dev)
758{
759 struct stmfts_data *sdata = dev_get_drvdata(dev);
760 int ret;
761
762 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
763 if (ret)
764 dev_err(dev, "failed to resume device: %d\n", ret);
765
766 return ret;
767}
768
769static int __maybe_unused stmfts_suspend(struct device *dev)
770{
771 struct stmfts_data *sdata = dev_get_drvdata(dev);
772
773 stmfts_power_off(sdata);
774
775 return 0;
776}
777
778static int __maybe_unused stmfts_resume(struct device *dev)
779{
780 struct stmfts_data *sdata = dev_get_drvdata(dev);
781
782 return stmfts_power_on(sdata);
783}
784
785static const struct dev_pm_ops stmfts_pm_ops = {
786 SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
787 SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
788};
789
790#ifdef CONFIG_OF
791static const struct of_device_id stmfts_of_match[] = {
792 { .compatible = "st,stmfts", },
793 { },
794};
795MODULE_DEVICE_TABLE(of, stmfts_of_match);
796#endif
797
798static const struct i2c_device_id stmfts_id[] = {
799 { "stmfts", 0 },
800 { },
801};
802MODULE_DEVICE_TABLE(i2c, stmfts_id);
803
804static struct i2c_driver stmfts_driver = {
805 .driver = {
806 .name = STMFTS_DEV_NAME,
807 .of_match_table = of_match_ptr(stmfts_of_match),
808 .pm = &stmfts_pm_ops,
809 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
810 },
811 .probe = stmfts_probe,
812 .remove = stmfts_remove,
813 .id_table = stmfts_id,
814};
815
816module_i2c_driver(stmfts_driver);
817
818MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
819MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
820MODULE_LICENSE("GPL v2");