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
72 enum stmfts_regulators {
73 STMFTS_REGULATOR_VDD,
74 STMFTS_REGULATOR_AVDD,
75 };
76
77 struct 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
stmfts_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)109 static 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 disable ledvdd regulator: %d\n",
124 err);
125 return err;
126 }
127 }
128 sdata->led_status = value;
129 }
130
131 return 0;
132 }
133
stmfts_brightness_get(struct led_classdev * led_cdev)134 static 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 more than 255 bytes (
145 */
stmfts_read_events(struct stmfts_data * sdata)146 static 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
stmfts_report_contact_event(struct stmfts_data * sdata,const u8 event[])171 static 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
stmfts_report_contact_release(struct stmfts_data * sdata,const u8 event[])195 static 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
stmfts_report_hover_event(struct stmfts_data * sdata,const u8 event[])206 static 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
stmfts_report_key_event(struct stmfts_data * sdata,const u8 event[])220 static 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
stmfts_parse_events(struct stmfts_data * sdata)245 static 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
stmfts_irq_handler(int irq,void * dev)300 static irqreturn_t stmfts_irq_handler(int irq, void *dev)
301 {
302 struct stmfts_data *sdata = dev;
303 int err;
304
305 mutex_lock(&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 mutex_unlock(&sdata->mutex);
315 return IRQ_HANDLED;
316 }
317
stmfts_command(struct stmfts_data * sdata,const u8 cmd)318 static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
319 {
320 int err;
321
322 reinit_completion(&sdata->cmd_done);
323
324 err = i2c_smbus_write_byte(sdata->client, cmd);
325 if (err)
326 return err;
327
328 if (!wait_for_completion_timeout(&sdata->cmd_done,
329 msecs_to_jiffies(1000)))
330 return -ETIMEDOUT;
331
332 return 0;
333 }
334
stmfts_input_open(struct input_dev * dev)335 static int stmfts_input_open(struct input_dev *dev)
336 {
337 struct stmfts_data *sdata = input_get_drvdata(dev);
338 int err;
339
340 err = pm_runtime_resume_and_get(&sdata->client->dev);
341 if (err)
342 return err;
343
344 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
345 if (err) {
346 pm_runtime_put_sync(&sdata->client->dev);
347 return err;
348 }
349
350 mutex_lock(&sdata->mutex);
351 sdata->running = true;
352
353 if (sdata->hover_enabled) {
354 err = i2c_smbus_write_byte(sdata->client,
355 STMFTS_SS_HOVER_SENSE_ON);
356 if (err)
357 dev_warn(&sdata->client->dev,
358 "failed to enable hover\n");
359 }
360 mutex_unlock(&sdata->mutex);
361
362 if (sdata->use_key) {
363 err = i2c_smbus_write_byte(sdata->client,
364 STMFTS_MS_KEY_SENSE_ON);
365 if (err)
366 /* I can still use only the touch screen */
367 dev_warn(&sdata->client->dev,
368 "failed to enable touchkey\n");
369 }
370
371 return 0;
372 }
373
stmfts_input_close(struct input_dev * dev)374 static void stmfts_input_close(struct input_dev *dev)
375 {
376 struct stmfts_data *sdata = input_get_drvdata(dev);
377 int err;
378
379 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
380 if (err)
381 dev_warn(&sdata->client->dev,
382 "failed to disable touchscreen: %d\n", err);
383
384 mutex_lock(&sdata->mutex);
385
386 sdata->running = false;
387
388 if (sdata->hover_enabled) {
389 err = i2c_smbus_write_byte(sdata->client,
390 STMFTS_SS_HOVER_SENSE_OFF);
391 if (err)
392 dev_warn(&sdata->client->dev,
393 "failed to disable hover: %d\n", err);
394 }
395 mutex_unlock(&sdata->mutex);
396
397 if (sdata->use_key) {
398 err = i2c_smbus_write_byte(sdata->client,
399 STMFTS_MS_KEY_SENSE_OFF);
400 if (err)
401 dev_warn(&sdata->client->dev,
402 "failed to disable touchkey: %d\n", err);
403 }
404
405 pm_runtime_put_sync(&sdata->client->dev);
406 }
407
stmfts_sysfs_chip_id(struct device * dev,struct device_attribute * attr,char * buf)408 static ssize_t stmfts_sysfs_chip_id(struct device *dev,
409 struct device_attribute *attr, char *buf)
410 {
411 struct stmfts_data *sdata = dev_get_drvdata(dev);
412
413 return sprintf(buf, "%#x\n", sdata->chip_id);
414 }
415
stmfts_sysfs_chip_version(struct device * dev,struct device_attribute * attr,char * buf)416 static ssize_t stmfts_sysfs_chip_version(struct device *dev,
417 struct device_attribute *attr, char *buf)
418 {
419 struct stmfts_data *sdata = dev_get_drvdata(dev);
420
421 return sprintf(buf, "%u\n", sdata->chip_ver);
422 }
423
stmfts_sysfs_fw_ver(struct device * dev,struct device_attribute * attr,char * buf)424 static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
425 struct device_attribute *attr, char *buf)
426 {
427 struct stmfts_data *sdata = dev_get_drvdata(dev);
428
429 return sprintf(buf, "%u\n", sdata->fw_ver);
430 }
431
stmfts_sysfs_config_id(struct device * dev,struct device_attribute * attr,char * buf)432 static ssize_t stmfts_sysfs_config_id(struct device *dev,
433 struct device_attribute *attr, char *buf)
434 {
435 struct stmfts_data *sdata = dev_get_drvdata(dev);
436
437 return sprintf(buf, "%#x\n", sdata->config_id);
438 }
439
stmfts_sysfs_config_version(struct device * dev,struct device_attribute * attr,char * buf)440 static ssize_t stmfts_sysfs_config_version(struct device *dev,
441 struct device_attribute *attr, char *buf)
442 {
443 struct stmfts_data *sdata = dev_get_drvdata(dev);
444
445 return sprintf(buf, "%u\n", sdata->config_ver);
446 }
447
stmfts_sysfs_read_status(struct device * dev,struct device_attribute * attr,char * buf)448 static ssize_t stmfts_sysfs_read_status(struct device *dev,
449 struct device_attribute *attr, char *buf)
450 {
451 struct stmfts_data *sdata = dev_get_drvdata(dev);
452 u8 status[4];
453 int err;
454
455 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
456 sizeof(status), status);
457 if (err)
458 return err;
459
460 return sprintf(buf, "%#02x\n", status[0]);
461 }
462
stmfts_sysfs_hover_enable_read(struct device * dev,struct device_attribute * attr,char * buf)463 static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
464 struct device_attribute *attr, char *buf)
465 {
466 struct stmfts_data *sdata = dev_get_drvdata(dev);
467
468 return sprintf(buf, "%u\n", sdata->hover_enabled);
469 }
470
stmfts_sysfs_hover_enable_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)471 static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
472 struct device_attribute *attr,
473 const char *buf, size_t len)
474 {
475 struct stmfts_data *sdata = dev_get_drvdata(dev);
476 unsigned long value;
477 int err = 0;
478
479 if (kstrtoul(buf, 0, &value))
480 return -EINVAL;
481
482 mutex_lock(&sdata->mutex);
483
484 if (value && sdata->hover_enabled)
485 goto out;
486
487 if (sdata->running)
488 err = i2c_smbus_write_byte(sdata->client,
489 value ? STMFTS_SS_HOVER_SENSE_ON :
490 STMFTS_SS_HOVER_SENSE_OFF);
491
492 if (!err)
493 sdata->hover_enabled = !!value;
494
495 out:
496 mutex_unlock(&sdata->mutex);
497
498 return len;
499 }
500
501 static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
502 static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
503 static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
504 static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
505 static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
506 static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
507 static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
508 stmfts_sysfs_hover_enable_write);
509
510 static struct attribute *stmfts_sysfs_attrs[] = {
511 &dev_attr_chip_id.attr,
512 &dev_attr_chip_version.attr,
513 &dev_attr_fw_ver.attr,
514 &dev_attr_config_id.attr,
515 &dev_attr_config_version.attr,
516 &dev_attr_status.attr,
517 &dev_attr_hover_enable.attr,
518 NULL
519 };
520 ATTRIBUTE_GROUPS(stmfts_sysfs);
521
stmfts_power_on(struct stmfts_data * sdata)522 static int stmfts_power_on(struct stmfts_data *sdata)
523 {
524 int err;
525 u8 reg[8];
526
527 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
528 sdata->regulators);
529 if (err)
530 return err;
531
532 /*
533 * The datasheet does not specify the power on time, but considering
534 * that the reset time is < 10ms, I sleep 20ms to be sure
535 */
536 msleep(20);
537
538 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
539 sizeof(reg), reg);
540 if (err < 0)
541 return err;
542 if (err != sizeof(reg))
543 return -EIO;
544
545 sdata->chip_id = be16_to_cpup((__be16 *)®[6]);
546 sdata->chip_ver = reg[0];
547 sdata->fw_ver = be16_to_cpup((__be16 *)®[2]);
548 sdata->config_id = reg[4];
549 sdata->config_ver = reg[5];
550
551 enable_irq(sdata->client->irq);
552
553 msleep(50);
554
555 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
556 if (err)
557 return err;
558
559 err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
560 if (err)
561 return err;
562
563 /* optional tuning */
564 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
565 if (err)
566 dev_warn(&sdata->client->dev,
567 "failed to perform mutual auto tune: %d\n", err);
568
569 /* optional tuning */
570 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
571 if (err)
572 dev_warn(&sdata->client->dev,
573 "failed to perform self auto tune: %d\n", err);
574
575 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
576 if (err)
577 return err;
578
579 /*
580 * At this point no one is using the touchscreen
581 * and I don't really care about the return value
582 */
583 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
584
585 return 0;
586 }
587
stmfts_power_off(void * data)588 static void stmfts_power_off(void *data)
589 {
590 struct stmfts_data *sdata = data;
591
592 disable_irq(sdata->client->irq);
593 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
594 sdata->regulators);
595 }
596
597 /* This function is void because I don't want to prevent using the touch key
598 * only because the LEDs don't get registered
599 */
stmfts_enable_led(struct stmfts_data * sdata)600 static int stmfts_enable_led(struct stmfts_data *sdata)
601 {
602 int err;
603
604 /* get the regulator for powering the leds on */
605 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
606 if (IS_ERR(sdata->ledvdd))
607 return PTR_ERR(sdata->ledvdd);
608
609 sdata->led_cdev.name = STMFTS_DEV_NAME;
610 sdata->led_cdev.max_brightness = LED_ON;
611 sdata->led_cdev.brightness = LED_OFF;
612 sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
613 sdata->led_cdev.brightness_get = stmfts_brightness_get;
614
615 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
616 if (err) {
617 devm_regulator_put(sdata->ledvdd);
618 return err;
619 }
620
621 return 0;
622 }
623
stmfts_probe(struct i2c_client * client)624 static int stmfts_probe(struct i2c_client *client)
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 err = devm_request_threaded_irq(&client->dev, client->irq,
693 NULL, stmfts_irq_handler,
694 IRQF_ONESHOT | IRQF_NO_AUTOEN,
695 "stmfts_irq", sdata);
696 if (err)
697 return err;
698
699 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
700
701 err = stmfts_power_on(sdata);
702 if (err)
703 return err;
704
705 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
706 if (err)
707 return err;
708
709 err = input_register_device(sdata->input);
710 if (err)
711 return err;
712
713 if (sdata->use_key) {
714 err = stmfts_enable_led(sdata);
715 if (err) {
716 /*
717 * Even if the LEDs have failed to be initialized and
718 * used in the driver, I can still use the device even
719 * without LEDs. The ledvdd regulator pointer will be
720 * used as a flag.
721 */
722 dev_warn(&client->dev, "unable to use touchkey leds\n");
723 sdata->ledvdd = NULL;
724 }
725 }
726
727 pm_runtime_enable(&client->dev);
728 device_enable_async_suspend(&client->dev);
729
730 return 0;
731 }
732
stmfts_remove(struct i2c_client * client)733 static void stmfts_remove(struct i2c_client *client)
734 {
735 pm_runtime_disable(&client->dev);
736 }
737
stmfts_runtime_suspend(struct device * dev)738 static int stmfts_runtime_suspend(struct device *dev)
739 {
740 struct stmfts_data *sdata = dev_get_drvdata(dev);
741 int ret;
742
743 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
744 if (ret)
745 dev_warn(dev, "failed to suspend device: %d\n", ret);
746
747 return ret;
748 }
749
stmfts_runtime_resume(struct device * dev)750 static int stmfts_runtime_resume(struct device *dev)
751 {
752 struct stmfts_data *sdata = dev_get_drvdata(dev);
753 int ret;
754
755 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
756 if (ret)
757 dev_err(dev, "failed to resume device: %d\n", ret);
758
759 return ret;
760 }
761
stmfts_suspend(struct device * dev)762 static int stmfts_suspend(struct device *dev)
763 {
764 struct stmfts_data *sdata = dev_get_drvdata(dev);
765
766 stmfts_power_off(sdata);
767
768 return 0;
769 }
770
stmfts_resume(struct device * dev)771 static int stmfts_resume(struct device *dev)
772 {
773 struct stmfts_data *sdata = dev_get_drvdata(dev);
774
775 return stmfts_power_on(sdata);
776 }
777
778 static const struct dev_pm_ops stmfts_pm_ops = {
779 SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
780 RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
781 };
782
783 #ifdef CONFIG_OF
784 static const struct of_device_id stmfts_of_match[] = {
785 { .compatible = "st,stmfts", },
786 { },
787 };
788 MODULE_DEVICE_TABLE(of, stmfts_of_match);
789 #endif
790
791 static const struct i2c_device_id stmfts_id[] = {
792 { "stmfts" },
793 { }
794 };
795 MODULE_DEVICE_TABLE(i2c, stmfts_id);
796
797 static struct i2c_driver stmfts_driver = {
798 .driver = {
799 .name = STMFTS_DEV_NAME,
800 .dev_groups = stmfts_sysfs_groups,
801 .of_match_table = of_match_ptr(stmfts_of_match),
802 .pm = pm_ptr(&stmfts_pm_ops),
803 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
804 },
805 .probe = stmfts_probe,
806 .remove = stmfts_remove,
807 .id_table = stmfts_id,
808 };
809
810 module_i2c_driver(stmfts_driver);
811
812 MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
813 MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
814 MODULE_LICENSE("GPL v2");
815