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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 <[email protected]>
6
7#include <linux/delay.h>
8#include <linux/gpio/consumer.h>
9#include <linux/i2c.h>
10#include <linux/input/mt.h>
11#include <linux/input/touchscreen.h>
12#include <linux/interrupt.h>
13#include <linux/irq.h>
14#include <linux/leds.h>
15#include <linux/module.h>
16#include <linux/pm_runtime.h>
17#include <linux/regulator/consumer.h>
18
19/* I2C commands */
20#define STMFTS_READ_INFO 0x80
21#define STMFTS_READ_STATUS 0x84
22#define STMFTS_READ_ONE_EVENT 0x85
23#define STMFTS_READ_ALL_EVENT 0x86
24#define STMFTS_LATEST_EVENT 0x87
25#define STMFTS_SLEEP_IN 0x90
26#define STMFTS_SLEEP_OUT 0x91
27#define STMFTS_MS_MT_SENSE_OFF 0x92
28#define STMFTS_MS_MT_SENSE_ON 0x93
29#define STMFTS_SS_HOVER_SENSE_OFF 0x94
30#define STMFTS_SS_HOVER_SENSE_ON 0x95
31#define STMFTS_MS_KEY_SENSE_OFF 0x9a
32#define STMFTS_MS_KEY_SENSE_ON 0x9b
33#define STMFTS_SYSTEM_RESET 0xa0
34#define STMFTS_CLEAR_EVENT_STACK 0xa1
35#define STMFTS_FULL_FORCE_CALIBRATION 0xa2
36#define STMFTS_MS_CX_TUNING 0xa3
37#define STMFTS_SS_CX_TUNING 0xa4
38
39/* events */
40#define STMFTS_EV_NO_EVENT 0x00
41#define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02
42#define STMFTS_EV_MULTI_TOUCH_ENTER 0x03
43#define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04
44#define STMFTS_EV_MULTI_TOUCH_MOTION 0x05
45#define STMFTS_EV_HOVER_ENTER 0x07
46#define STMFTS_EV_HOVER_LEAVE 0x08
47#define STMFTS_EV_HOVER_MOTION 0x09
48#define STMFTS_EV_KEY_STATUS 0x0e
49#define STMFTS_EV_ERROR 0x0f
50#define STMFTS_EV_CONTROLLER_READY 0x10
51#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11
52#define STMFTS_EV_STATUS 0x16
53#define STMFTS_EV_DEBUG 0xdb
54
55/* multi touch related event masks */
56#define STMFTS_MASK_EVENT_ID 0x0f
57#define STMFTS_MASK_TOUCH_ID 0xf0
58#define STMFTS_MASK_LEFT_EVENT 0x0f
59#define STMFTS_MASK_X_MSB 0x0f
60#define STMFTS_MASK_Y_LSB 0xf0
61
62/* key related event masks */
63#define STMFTS_MASK_KEY_NO_TOUCH 0x00
64#define STMFTS_MASK_KEY_MENU 0x01
65#define STMFTS_MASK_KEY_BACK 0x02
66
67#define STMFTS_EVENT_SIZE 8
68#define STMFTS_STACK_DEPTH 32
69#define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
70#define STMFTS_MAX_FINGERS 10
71#define STMFTS_DEV_NAME "stmfts"
72
73static const struct regulator_bulk_data stmfts_supplies[] = {
74 { .supply = "vdd" },
75 { .supply = "avdd" },
76};
77
78struct stmfts_data {
79 struct i2c_client *client;
80 struct input_dev *input;
81 struct gpio_desc *reset_gpio;
82 struct led_classdev led_cdev;
83 struct mutex mutex;
84
85 struct touchscreen_properties prop;
86
87 struct regulator_bulk_data *supplies;
88
89 /*
90 * Presence of ledvdd will be used also to check
91 * whether the LED is supported.
92 */
93 struct regulator *ledvdd;
94
95 u16 chip_id;
96 u8 chip_ver;
97 u16 fw_ver;
98 u8 config_id;
99 u8 config_ver;
100
101 u8 data[STMFTS_DATA_MAX_SIZE];
102
103 struct completion cmd_done;
104
105 bool use_key;
106 bool led_status;
107 bool hover_enabled;
108 bool running;
109};
110
111static int stmfts_brightness_set(struct led_classdev *led_cdev,
112 enum led_brightness value)
113{
114 struct stmfts_data *sdata = container_of(led_cdev,
115 struct stmfts_data, led_cdev);
116 int err;
117
118 if (value != sdata->led_status && sdata->ledvdd) {
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 enable ledvdd regulator: %d\n",
126 err);
127 return err;
128 }
129 }
130 sdata->led_status = value;
131 }
132
133 return 0;
134}
135
136static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
137{
138 struct stmfts_data *sdata = container_of(led_cdev,
139 struct stmfts_data, led_cdev);
140
141 return !!regulator_is_enabled(sdata->ledvdd);
142}
143
144/*
145 * We can't simply use i2c_smbus_read_i2c_block_data because we
146 * need to read 256 bytes, which exceeds the 255-byte SMBus block limit.
147 */
148static int stmfts_read_events(struct stmfts_data *sdata)
149{
150 u8 cmd = STMFTS_READ_ALL_EVENT;
151 struct i2c_msg msgs[2] = {
152 {
153 .addr = sdata->client->addr,
154 .len = 1,
155 .buf = &cmd,
156 },
157 {
158 .addr = sdata->client->addr,
159 .flags = I2C_M_RD,
160 .len = STMFTS_DATA_MAX_SIZE,
161 .buf = sdata->data,
162 },
163 };
164 int ret;
165
166 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
167 if (ret < 0)
168 return ret;
169
170 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
171}
172
173static void stmfts_report_contact_event(struct stmfts_data *sdata,
174 const u8 event[])
175{
176 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
177 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
178 u16 y = (event[2] >> 4) | (event[3] << 4);
179 u8 maj = event[4];
180 u8 min = event[5];
181 u8 orientation = event[6];
182 u8 area = event[7];
183
184 input_mt_slot(sdata->input, slot_id);
185
186 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
187 input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
188 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
189 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
190 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
191 input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
192 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
193
194 input_sync(sdata->input);
195}
196
197static void stmfts_report_contact_release(struct stmfts_data *sdata,
198 const u8 event[])
199{
200 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
201
202 input_mt_slot(sdata->input, slot_id);
203 input_mt_report_slot_inactive(sdata->input);
204
205 input_sync(sdata->input);
206}
207
208static void stmfts_report_hover_event(struct stmfts_data *sdata,
209 const u8 event[])
210{
211 u16 x = (event[2] << 4) | (event[4] >> 4);
212 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
213 u8 z = event[5];
214
215 input_report_abs(sdata->input, ABS_X, x);
216 input_report_abs(sdata->input, ABS_Y, y);
217 input_report_abs(sdata->input, ABS_DISTANCE, z);
218
219 input_sync(sdata->input);
220}
221
222static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
223{
224 switch (event[2]) {
225 case 0:
226 input_report_key(sdata->input, KEY_BACK, 0);
227 input_report_key(sdata->input, KEY_MENU, 0);
228 break;
229
230 case STMFTS_MASK_KEY_BACK:
231 input_report_key(sdata->input, KEY_BACK, 1);
232 break;
233
234 case STMFTS_MASK_KEY_MENU:
235 input_report_key(sdata->input, KEY_MENU, 1);
236 break;
237
238 default:
239 dev_warn(&sdata->client->dev,
240 "unknown key event: %#02x\n", event[2]);
241 break;
242 }
243
244 input_sync(sdata->input);
245}
246
247static void stmfts_parse_events(struct stmfts_data *sdata)
248{
249 int i;
250
251 for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
252 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
253
254 switch (event[0]) {
255 case STMFTS_EV_CONTROLLER_READY:
256 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
257 case STMFTS_EV_STATUS:
258 complete(&sdata->cmd_done);
259 fallthrough;
260
261 case STMFTS_EV_NO_EVENT:
262 case STMFTS_EV_DEBUG:
263 return;
264 }
265
266 switch (event[0] & STMFTS_MASK_EVENT_ID) {
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,
416 char *buf)
417{
418 struct stmfts_data *sdata = dev_get_drvdata(dev);
419
420 return sysfs_emit(buf, "%u\n", sdata->chip_ver);
421}
422
423static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
424 struct device_attribute *attr, char *buf)
425{
426 struct stmfts_data *sdata = dev_get_drvdata(dev);
427
428 return sysfs_emit(buf, "%u\n", sdata->fw_ver);
429}
430
431static ssize_t stmfts_sysfs_config_id(struct device *dev,
432 struct device_attribute *attr, char *buf)
433{
434 struct stmfts_data *sdata = dev_get_drvdata(dev);
435
436 return sysfs_emit(buf, "%#x\n", sdata->config_id);
437}
438
439static ssize_t stmfts_sysfs_config_version(struct device *dev,
440 struct device_attribute *attr,
441 char *buf)
442{
443 struct stmfts_data *sdata = dev_get_drvdata(dev);
444
445 return sysfs_emit(buf, "%u\n", sdata->config_ver);
446}
447
448static ssize_t stmfts_sysfs_read_status(struct device *dev,
449 struct device_attribute *attr,
450 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 sysfs_emit(buf, "%#02x\n", status[0]);
462}
463
464static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
465 struct device_attribute *attr,
466 char *buf)
467{
468 struct stmfts_data *sdata = dev_get_drvdata(dev);
469
470 return sysfs_emit(buf, "%u\n", sdata->hover_enabled);
471}
472
473static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
474 struct device_attribute *attr,
475 const char *buf, size_t len)
476{
477 struct stmfts_data *sdata = dev_get_drvdata(dev);
478 unsigned long value;
479 bool hover;
480 int err;
481
482 if (kstrtoul(buf, 0, &value))
483 return -EINVAL;
484
485 hover = !!value;
486
487 guard(mutex)(&sdata->mutex);
488
489 if (hover != sdata->hover_enabled) {
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 if (err)
495 return err;
496 }
497
498 sdata->hover_enabled = hover;
499 }
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};
523ATTRIBUTE_GROUPS(stmfts_sysfs);
524
525static int stmfts_read_system_info(struct stmfts_data *sdata)
526{
527 int err;
528 u8 reg[8];
529
530 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
531 sizeof(reg), reg);
532 if (err < 0)
533 return err;
534 if (err != sizeof(reg))
535 return -EIO;
536
537 sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
538 sdata->chip_ver = reg[0];
539 sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
540 sdata->config_id = reg[4];
541 sdata->config_ver = reg[5];
542
543 return 0;
544}
545
546static void stmfts_reset(struct stmfts_data *sdata)
547{
548 gpiod_set_value_cansleep(sdata->reset_gpio, 1);
549 msleep(20);
550
551 gpiod_set_value_cansleep(sdata->reset_gpio, 0);
552 msleep(50);
553}
554
555static int stmfts_configure(struct stmfts_data *sdata)
556{
557 int err;
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 return 0;
584}
585
586static int stmfts_power_on(struct stmfts_data *sdata)
587{
588 int err;
589
590 err = regulator_bulk_enable(ARRAY_SIZE(stmfts_supplies),
591 sdata->supplies);
592 if (err)
593 return err;
594
595 /*
596 * The datasheet does not specify the power on time, but considering
597 * that the reset time is < 10ms, I sleep 20ms to be sure
598 */
599 msleep(20);
600
601 if (sdata->reset_gpio)
602 stmfts_reset(sdata);
603
604 err = stmfts_read_system_info(sdata);
605 if (err)
606 goto err_disable_regulators;
607
608 enable_irq(sdata->client->irq);
609
610 msleep(50);
611
612 err = stmfts_configure(sdata);
613 if (err)
614 goto err_disable_irq;
615
616 /*
617 * At this point no one is using the touchscreen
618 * and I don't really care about the return value
619 */
620 (void)i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
621
622 return 0;
623
624err_disable_irq:
625 disable_irq(sdata->client->irq);
626err_disable_regulators:
627 regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies);
628 return err;
629}
630
631static void stmfts_power_off(void *data)
632{
633 struct stmfts_data *sdata = data;
634
635 disable_irq(sdata->client->irq);
636
637 if (sdata->reset_gpio)
638 gpiod_set_value_cansleep(sdata->reset_gpio, 1);
639
640 regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies);
641}
642
643static int stmfts_enable_led(struct stmfts_data *sdata)
644{
645 int err;
646
647 /* get the regulator for powering the leds on */
648 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
649 if (IS_ERR(sdata->ledvdd))
650 return PTR_ERR(sdata->ledvdd);
651
652 sdata->led_cdev.name = STMFTS_DEV_NAME;
653 sdata->led_cdev.max_brightness = LED_ON;
654 sdata->led_cdev.brightness = LED_OFF;
655 sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
656 sdata->led_cdev.brightness_get = stmfts_brightness_get;
657
658 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
659 if (err) {
660 devm_regulator_put(sdata->ledvdd);
661 return err;
662 }
663
664 return 0;
665}
666
667static int stmfts_probe(struct i2c_client *client)
668{
669 struct device *dev = &client->dev;
670 int err;
671 struct stmfts_data *sdata;
672
673 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
674 I2C_FUNC_SMBUS_BYTE_DATA |
675 I2C_FUNC_SMBUS_I2C_BLOCK))
676 return -ENODEV;
677
678 sdata = devm_kzalloc(dev, sizeof(*sdata), GFP_KERNEL);
679 if (!sdata)
680 return -ENOMEM;
681
682 i2c_set_clientdata(client, sdata);
683
684 sdata->client = client;
685 mutex_init(&sdata->mutex);
686 init_completion(&sdata->cmd_done);
687
688 err = devm_regulator_bulk_get_const(dev,
689 ARRAY_SIZE(stmfts_supplies),
690 stmfts_supplies,
691 &sdata->supplies);
692 if (err)
693 return err;
694
695 sdata->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
696 if (IS_ERR(sdata->reset_gpio))
697 return dev_err_probe(dev, PTR_ERR(sdata->reset_gpio),
698 "Failed to get GPIO 'reset'\n");
699
700 sdata->input = devm_input_allocate_device(dev);
701 if (!sdata->input)
702 return -ENOMEM;
703
704 sdata->input->name = STMFTS_DEV_NAME;
705 sdata->input->id.bustype = BUS_I2C;
706 sdata->input->open = stmfts_input_open;
707 sdata->input->close = stmfts_input_close;
708
709 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
710 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
711 touchscreen_parse_properties(sdata->input, true, &sdata->prop);
712
713 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
714 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
715 input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
716 input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
717 input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
718
719 sdata->use_key = device_property_read_bool(dev, "touch-key-connected");
720 if (sdata->use_key) {
721 input_set_capability(sdata->input, EV_KEY, KEY_MENU);
722 input_set_capability(sdata->input, EV_KEY, KEY_BACK);
723 }
724
725 err = input_mt_init_slots(sdata->input,
726 STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
727 if (err)
728 return err;
729
730 input_set_drvdata(sdata->input, sdata);
731
732 /*
733 * stmfts_power_on expects interrupt to be disabled, but
734 * at this point the device is still off and I do not trust
735 * the status of the irq line that can generate some spurious
736 * interrupts. To be on the safe side it's better to not enable
737 * the interrupts during their request.
738 */
739 err = devm_request_threaded_irq(dev, client->irq,
740 NULL, stmfts_irq_handler,
741 IRQF_ONESHOT | IRQF_NO_AUTOEN,
742 "stmfts_irq", sdata);
743 if (err)
744 return err;
745
746 dev_dbg(dev, "initializing ST-Microelectronics FTS...\n");
747
748 err = stmfts_power_on(sdata);
749 if (err)
750 return err;
751
752 err = devm_add_action_or_reset(dev, stmfts_power_off, sdata);
753 if (err)
754 return err;
755
756 err = input_register_device(sdata->input);
757 if (err)
758 return err;
759
760 if (sdata->use_key) {
761 err = stmfts_enable_led(sdata);
762 if (err) {
763 /*
764 * Even if the LEDs have failed to be initialized and
765 * used in the driver, I can still use the device even
766 * without LEDs. The ledvdd regulator pointer will be
767 * used as a flag.
768 */
769 dev_warn(dev, "unable to use touchkey leds\n");
770 sdata->ledvdd = NULL;
771 }
772 }
773
774 pm_runtime_enable(dev);
775 device_enable_async_suspend(dev);
776
777 return 0;
778}
779
780static void stmfts_remove(struct i2c_client *client)
781{
782 pm_runtime_disable(&client->dev);
783}
784
785static int stmfts_runtime_suspend(struct device *dev)
786{
787 struct stmfts_data *sdata = dev_get_drvdata(dev);
788 int ret;
789
790 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
791 if (ret)
792 dev_warn(dev, "failed to suspend device: %d\n", ret);
793
794 return ret;
795}
796
797static int stmfts_runtime_resume(struct device *dev)
798{
799 struct stmfts_data *sdata = dev_get_drvdata(dev);
800 struct i2c_client *client = sdata->client;
801 int ret;
802
803 ret = i2c_smbus_write_byte(client, STMFTS_SLEEP_OUT);
804 if (ret)
805 dev_err(dev, "failed to resume device: %d\n", ret);
806
807 return ret;
808}
809
810static int stmfts_suspend(struct device *dev)
811{
812 struct stmfts_data *sdata = dev_get_drvdata(dev);
813
814 stmfts_power_off(sdata);
815
816 return 0;
817}
818
819static int stmfts_resume(struct device *dev)
820{
821 struct stmfts_data *sdata = dev_get_drvdata(dev);
822
823 return stmfts_power_on(sdata);
824}
825
826static const struct dev_pm_ops stmfts_pm_ops = {
827 SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
828 RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
829};
830
831#ifdef CONFIG_OF
832static const struct of_device_id stmfts_of_match[] = {
833 { .compatible = "st,stmfts", },
834 { },
835};
836MODULE_DEVICE_TABLE(of, stmfts_of_match);
837#endif
838
839static const struct i2c_device_id stmfts_id[] = {
840 { .name = "stmfts" },
841 { }
842};
843MODULE_DEVICE_TABLE(i2c, stmfts_id);
844
845static struct i2c_driver stmfts_driver = {
846 .driver = {
847 .name = STMFTS_DEV_NAME,
848 .dev_groups = stmfts_sysfs_groups,
849 .of_match_table = of_match_ptr(stmfts_of_match),
850 .pm = pm_ptr(&stmfts_pm_ops),
851 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
852 },
853 .probe = stmfts_probe,
854 .remove = stmfts_remove,
855 .id_table = stmfts_id,
856};
857
858module_i2c_driver(stmfts_driver);
859
860MODULE_AUTHOR("Andi Shyti <[email protected]>");
861MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
862MODULE_LICENSE("GPL");