xref: /linux/drivers/input/touchscreen/cyttsp_core.c (revision b8fa3e3833c14151a47ebebbc5427dcfe94bb407) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Core Source for:
4  * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
5  * For use with Cypress Txx3xx parts.
6  * Supported parts include:
7  * CY8CTST341
8  * CY8CTMA340
9  *
10  * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
11  * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
12  *
13  * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
14  */
15 
16 #include <linux/delay.h>
17 #include <linux/input.h>
18 #include <linux/input/mt.h>
19 #include <linux/input/touchscreen.h>
20 #include <linux/gpio.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/property.h>
24 #include <linux/gpio/consumer.h>
25 #include <linux/regulator/consumer.h>
26 
27 #include "cyttsp_core.h"
28 
29 /* Bootloader number of command keys */
30 #define CY_NUM_BL_KEYS		8
31 
32 /* helpers */
33 #define GET_NUM_TOUCHES(x)		((x) & 0x0F)
34 #define IS_LARGE_AREA(x)		(((x) & 0x10) >> 4)
35 #define IS_BAD_PKT(x)			((x) & 0x20)
36 #define IS_VALID_APP(x)			((x) & 0x01)
37 #define IS_OPERATIONAL_ERR(x)		((x) & 0x3F)
38 #define GET_HSTMODE(reg)		(((reg) & 0x70) >> 4)
39 #define GET_BOOTLOADERMODE(reg)		(((reg) & 0x10) >> 4)
40 
41 #define CY_REG_BASE			0x00
42 #define CY_REG_ACT_DIST			0x1E
43 #define CY_REG_ACT_INTRVL		0x1D
44 #define CY_REG_TCH_TMOUT		(CY_REG_ACT_INTRVL + 1)
45 #define CY_REG_LP_INTRVL		(CY_REG_TCH_TMOUT + 1)
46 #define CY_MAXZ				255
47 #define CY_DELAY_DFLT			20 /* ms */
48 #define CY_DELAY_MAX			500
49 /* Active distance in pixels for a gesture to be reported */
50 #define CY_ACT_DIST_DFLT		0xF8 /* pixels */
51 #define CY_ACT_DIST_MASK		0x0F
52 /* Active Power state scanning/processing refresh interval */
53 #define CY_ACT_INTRVL_DFLT		0x00 /* ms */
54 /* Low Power state scanning/processing refresh interval */
55 #define CY_LP_INTRVL_DFLT		0x0A /* ms */
56 /* touch timeout for the Active power */
57 #define CY_TCH_TMOUT_DFLT		0xFF /* ms */
58 #define CY_HNDSHK_BIT			0x80
59 /* device mode bits */
60 #define CY_OPERATE_MODE			0x00
61 #define CY_SYSINFO_MODE			0x10
62 /* power mode select bits */
63 #define CY_SOFT_RESET_MODE		0x01 /* return to Bootloader mode */
64 #define CY_DEEP_SLEEP_MODE		0x02
65 #define CY_LOW_POWER_MODE		0x04
66 
67 /* Slots management */
68 #define CY_MAX_FINGER			4
69 #define CY_MAX_ID			16
70 
71 static const u8 bl_command[] = {
72 	0x00,			/* file offset */
73 	0xFF,			/* command */
74 	0xA5,			/* exit bootloader command */
75 	0, 1, 2, 3, 4, 5, 6, 7	/* default keys */
76 };
77 
78 static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
79 				u8 length, void *buf)
80 {
81 	int error;
82 	int tries;
83 
84 	for (tries = 0; tries < CY_NUM_RETRY; tries++) {
85 		error = ts->bus_ops->read(ts->dev, ts->xfer_buf, command,
86 				length, buf);
87 		if (!error)
88 			return 0;
89 
90 		msleep(CY_DELAY_DFLT);
91 	}
92 
93 	return -EIO;
94 }
95 
96 static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
97 				 u8 length, void *buf)
98 {
99 	int error;
100 	int tries;
101 
102 	for (tries = 0; tries < CY_NUM_RETRY; tries++) {
103 		error = ts->bus_ops->write(ts->dev, ts->xfer_buf, command,
104 				length, buf);
105 		if (!error)
106 			return 0;
107 
108 		msleep(CY_DELAY_DFLT);
109 	}
110 
111 	return -EIO;
112 }
113 
114 static int ttsp_send_command(struct cyttsp *ts, u8 cmd)
115 {
116 	return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
117 }
118 
119 static int cyttsp_handshake(struct cyttsp *ts)
120 {
121 	if (ts->use_hndshk)
122 		return ttsp_send_command(ts,
123 				ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);
124 
125 	return 0;
126 }
127 
128 static int cyttsp_load_bl_regs(struct cyttsp *ts)
129 {
130 	memset(&ts->bl_data, 0, sizeof(ts->bl_data));
131 	ts->bl_data.bl_status = 0x10;
132 
133 	return ttsp_read_block_data(ts, CY_REG_BASE,
134 				    sizeof(ts->bl_data), &ts->bl_data);
135 }
136 
137 static int cyttsp_exit_bl_mode(struct cyttsp *ts)
138 {
139 	int error;
140 	u8 bl_cmd[sizeof(bl_command)];
141 
142 	memcpy(bl_cmd, bl_command, sizeof(bl_command));
143 	if (ts->bl_keys)
144 		memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
145 			ts->bl_keys, CY_NUM_BL_KEYS);
146 
147 	error = ttsp_write_block_data(ts, CY_REG_BASE,
148 				      sizeof(bl_cmd), bl_cmd);
149 	if (error)
150 		return error;
151 
152 	/* wait for TTSP Device to complete the operation */
153 	msleep(CY_DELAY_DFLT);
154 
155 	error = cyttsp_load_bl_regs(ts);
156 	if (error)
157 		return error;
158 
159 	if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
160 		return -EIO;
161 
162 	return 0;
163 }
164 
165 static int cyttsp_set_operational_mode(struct cyttsp *ts)
166 {
167 	int error;
168 
169 	error = ttsp_send_command(ts, CY_OPERATE_MODE);
170 	if (error)
171 		return error;
172 
173 	/* wait for TTSP Device to complete switch to Operational mode */
174 	error = ttsp_read_block_data(ts, CY_REG_BASE,
175 				     sizeof(ts->xy_data), &ts->xy_data);
176 	if (error)
177 		return error;
178 
179 	error = cyttsp_handshake(ts);
180 	if (error)
181 		return error;
182 
183 	return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0;
184 }
185 
186 static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
187 {
188 	int error;
189 
190 	memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data));
191 
192 	/* switch to sysinfo mode */
193 	error = ttsp_send_command(ts, CY_SYSINFO_MODE);
194 	if (error)
195 		return error;
196 
197 	/* read sysinfo registers */
198 	msleep(CY_DELAY_DFLT);
199 	error = ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->sysinfo_data),
200 				      &ts->sysinfo_data);
201 	if (error)
202 		return error;
203 
204 	error = cyttsp_handshake(ts);
205 	if (error)
206 		return error;
207 
208 	if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl)
209 		return -EIO;
210 
211 	return 0;
212 }
213 
214 static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
215 {
216 	int retval = 0;
217 
218 	if (ts->act_intrvl != CY_ACT_INTRVL_DFLT ||
219 	    ts->tch_tmout != CY_TCH_TMOUT_DFLT ||
220 	    ts->lp_intrvl != CY_LP_INTRVL_DFLT) {
221 
222 		u8 intrvl_ray[] = {
223 			ts->act_intrvl,
224 			ts->tch_tmout,
225 			ts->lp_intrvl
226 		};
227 
228 		/* set intrvl registers */
229 		retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL,
230 					sizeof(intrvl_ray), intrvl_ray);
231 		msleep(CY_DELAY_DFLT);
232 	}
233 
234 	return retval;
235 }
236 
237 static void cyttsp_hard_reset(struct cyttsp *ts)
238 {
239 	if (ts->reset_gpio) {
240 		/*
241 		 * According to the CY8CTMA340 datasheet page 21, the external
242 		 * reset pulse width should be >= 1 ms. The datasheet does not
243 		 * specify how long we have to wait after reset but a vendor
244 		 * tree specifies 5 ms here.
245 		 */
246 		gpiod_set_value_cansleep(ts->reset_gpio, 1);
247 		usleep_range(1000, 2000);
248 		gpiod_set_value_cansleep(ts->reset_gpio, 0);
249 		usleep_range(5000, 6000);
250 	}
251 }
252 
253 static int cyttsp_soft_reset(struct cyttsp *ts)
254 {
255 	int retval;
256 
257 	/* wait for interrupt to set ready completion */
258 	reinit_completion(&ts->bl_ready);
259 	ts->state = CY_BL_STATE;
260 
261 	enable_irq(ts->irq);
262 
263 	retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE);
264 	if (retval) {
265 		dev_err(ts->dev, "failed to send soft reset\n");
266 		goto out;
267 	}
268 
269 	if (!wait_for_completion_timeout(&ts->bl_ready,
270 			msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX))) {
271 		dev_err(ts->dev, "timeout waiting for soft reset\n");
272 		retval = -EIO;
273 	}
274 
275 out:
276 	ts->state = CY_IDLE_STATE;
277 	disable_irq(ts->irq);
278 	return retval;
279 }
280 
281 static int cyttsp_act_dist_setup(struct cyttsp *ts)
282 {
283 	u8 act_dist_setup = ts->act_dist;
284 
285 	/* Init gesture; active distance setup */
286 	return ttsp_write_block_data(ts, CY_REG_ACT_DIST,
287 				sizeof(act_dist_setup), &act_dist_setup);
288 }
289 
290 static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids)
291 {
292 	ids[0] = xy_data->touch12_id >> 4;
293 	ids[1] = xy_data->touch12_id & 0xF;
294 	ids[2] = xy_data->touch34_id >> 4;
295 	ids[3] = xy_data->touch34_id & 0xF;
296 }
297 
298 static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data,
299 					       int idx)
300 {
301 	switch (idx) {
302 	case 0:
303 		return &xy_data->tch1;
304 	case 1:
305 		return &xy_data->tch2;
306 	case 2:
307 		return &xy_data->tch3;
308 	case 3:
309 		return &xy_data->tch4;
310 	default:
311 		return NULL;
312 	}
313 }
314 
315 static void cyttsp_report_tchdata(struct cyttsp *ts)
316 {
317 	struct cyttsp_xydata *xy_data = &ts->xy_data;
318 	struct input_dev *input = ts->input;
319 	int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat);
320 	const struct cyttsp_tch *tch;
321 	int ids[CY_MAX_ID];
322 	int i;
323 	DECLARE_BITMAP(used, CY_MAX_ID);
324 
325 	if (IS_LARGE_AREA(xy_data->tt_stat) == 1) {
326 		/* terminate all active tracks */
327 		num_tch = 0;
328 		dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
329 	} else if (num_tch > CY_MAX_FINGER) {
330 		/* terminate all active tracks */
331 		num_tch = 0;
332 		dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
333 	} else if (IS_BAD_PKT(xy_data->tt_mode)) {
334 		/* terminate all active tracks */
335 		num_tch = 0;
336 		dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
337 	}
338 
339 	cyttsp_extract_track_ids(xy_data, ids);
340 
341 	bitmap_zero(used, CY_MAX_ID);
342 
343 	for (i = 0; i < num_tch; i++) {
344 		tch = cyttsp_get_tch(xy_data, i);
345 
346 		input_mt_slot(input, ids[i]);
347 		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
348 		input_report_abs(input, ABS_MT_POSITION_X, be16_to_cpu(tch->x));
349 		input_report_abs(input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y));
350 		input_report_abs(input, ABS_MT_TOUCH_MAJOR, tch->z);
351 
352 		__set_bit(ids[i], used);
353 	}
354 
355 	for (i = 0; i < CY_MAX_ID; i++) {
356 		if (test_bit(i, used))
357 			continue;
358 
359 		input_mt_slot(input, i);
360 		input_mt_report_slot_inactive(input);
361 	}
362 
363 	input_sync(input);
364 }
365 
366 static irqreturn_t cyttsp_irq(int irq, void *handle)
367 {
368 	struct cyttsp *ts = handle;
369 	int error;
370 
371 	if (unlikely(ts->state == CY_BL_STATE)) {
372 		complete(&ts->bl_ready);
373 		goto out;
374 	}
375 
376 	/* Get touch data from CYTTSP device */
377 	error = ttsp_read_block_data(ts, CY_REG_BASE,
378 				 sizeof(struct cyttsp_xydata), &ts->xy_data);
379 	if (error)
380 		goto out;
381 
382 	/* provide flow control handshake */
383 	error = cyttsp_handshake(ts);
384 	if (error)
385 		goto out;
386 
387 	if (unlikely(ts->state == CY_IDLE_STATE))
388 		goto out;
389 
390 	if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
391 		/*
392 		 * TTSP device has reset back to bootloader mode.
393 		 * Restore to operational mode.
394 		 */
395 		error = cyttsp_exit_bl_mode(ts);
396 		if (error) {
397 			dev_err(ts->dev,
398 				"Could not return to operational mode, err: %d\n",
399 				error);
400 			ts->state = CY_IDLE_STATE;
401 		}
402 	} else {
403 		cyttsp_report_tchdata(ts);
404 	}
405 
406 out:
407 	return IRQ_HANDLED;
408 }
409 
410 static int cyttsp_power_on(struct cyttsp *ts)
411 {
412 	int error;
413 
414 	error = cyttsp_soft_reset(ts);
415 	if (error)
416 		return error;
417 
418 	error = cyttsp_load_bl_regs(ts);
419 	if (error)
420 		return error;
421 
422 	if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) &&
423 	    IS_VALID_APP(ts->bl_data.bl_status)) {
424 		error = cyttsp_exit_bl_mode(ts);
425 		if (error) {
426 			dev_err(ts->dev, "failed to exit bootloader mode\n");
427 			return error;
428 		}
429 	}
430 
431 	if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE ||
432 	    IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) {
433 		return -ENODEV;
434 	}
435 
436 	error = cyttsp_set_sysinfo_mode(ts);
437 	if (error)
438 		return error;
439 
440 	error = cyttsp_set_sysinfo_regs(ts);
441 	if (error)
442 		return error;
443 
444 	error = cyttsp_set_operational_mode(ts);
445 	if (error)
446 		return error;
447 
448 	/* init active distance */
449 	error = cyttsp_act_dist_setup(ts);
450 	if (error)
451 		return error;
452 
453 	ts->state = CY_ACTIVE_STATE;
454 
455 	return 0;
456 }
457 
458 static int cyttsp_enable(struct cyttsp *ts)
459 {
460 	int error;
461 
462 	/*
463 	 * The device firmware can wake on an I2C or SPI memory slave
464 	 * address match. So just reading a register is sufficient to
465 	 * wake up the device. The first read attempt will fail but it
466 	 * will wake it up making the second read attempt successful.
467 	 */
468 	error = ttsp_read_block_data(ts, CY_REG_BASE,
469 				     sizeof(ts->xy_data), &ts->xy_data);
470 	if (error)
471 		return error;
472 
473 	if (GET_HSTMODE(ts->xy_data.hst_mode))
474 		return -EIO;
475 
476 	enable_irq(ts->irq);
477 
478 	return 0;
479 }
480 
481 static int cyttsp_disable(struct cyttsp *ts)
482 {
483 	int error;
484 
485 	error = ttsp_send_command(ts, CY_LOW_POWER_MODE);
486 	if (error)
487 		return error;
488 
489 	disable_irq(ts->irq);
490 
491 	return 0;
492 }
493 
494 static int cyttsp_suspend(struct device *dev)
495 {
496 	struct cyttsp *ts = dev_get_drvdata(dev);
497 	int retval = 0;
498 
499 	mutex_lock(&ts->input->mutex);
500 
501 	if (input_device_enabled(ts->input)) {
502 		retval = cyttsp_disable(ts);
503 		if (retval == 0)
504 			ts->suspended = true;
505 	}
506 
507 	mutex_unlock(&ts->input->mutex);
508 
509 	return retval;
510 }
511 
512 static int cyttsp_resume(struct device *dev)
513 {
514 	struct cyttsp *ts = dev_get_drvdata(dev);
515 
516 	mutex_lock(&ts->input->mutex);
517 
518 	if (input_device_enabled(ts->input))
519 		cyttsp_enable(ts);
520 
521 	ts->suspended = false;
522 
523 	mutex_unlock(&ts->input->mutex);
524 
525 	return 0;
526 }
527 
528 EXPORT_GPL_SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume);
529 
530 static int cyttsp_open(struct input_dev *dev)
531 {
532 	struct cyttsp *ts = input_get_drvdata(dev);
533 	int retval = 0;
534 
535 	if (!ts->suspended)
536 		retval = cyttsp_enable(ts);
537 
538 	return retval;
539 }
540 
541 static void cyttsp_close(struct input_dev *dev)
542 {
543 	struct cyttsp *ts = input_get_drvdata(dev);
544 
545 	if (!ts->suspended)
546 		cyttsp_disable(ts);
547 }
548 
549 static int cyttsp_parse_properties(struct cyttsp *ts)
550 {
551 	struct device *dev = ts->dev;
552 	u32 dt_value;
553 	int ret;
554 
555 	ts->bl_keys = devm_kzalloc(dev, CY_NUM_BL_KEYS, GFP_KERNEL);
556 	if (!ts->bl_keys)
557 		return -ENOMEM;
558 
559 	/* Set some default values */
560 	ts->use_hndshk = false;
561 	ts->act_dist = CY_ACT_DIST_DFLT;
562 	ts->act_intrvl = CY_ACT_INTRVL_DFLT;
563 	ts->tch_tmout = CY_TCH_TMOUT_DFLT;
564 	ts->lp_intrvl = CY_LP_INTRVL_DFLT;
565 
566 	ret = device_property_read_u8_array(dev, "bootloader-key",
567 					    ts->bl_keys, CY_NUM_BL_KEYS);
568 	if (ret) {
569 		dev_err(dev,
570 			"bootloader-key property could not be retrieved\n");
571 		return ret;
572 	}
573 
574 	ts->use_hndshk = device_property_present(dev, "use-handshake");
575 
576 	if (!device_property_read_u32(dev, "active-distance", &dt_value)) {
577 		if (dt_value > 15) {
578 			dev_err(dev, "active-distance (%u) must be [0-15]\n",
579 				dt_value);
580 			return -EINVAL;
581 		}
582 		ts->act_dist &= ~CY_ACT_DIST_MASK;
583 		ts->act_dist |= dt_value;
584 	}
585 
586 	if (!device_property_read_u32(dev, "active-interval-ms", &dt_value)) {
587 		if (dt_value > 255) {
588 			dev_err(dev, "active-interval-ms (%u) must be [0-255]\n",
589 				dt_value);
590 			return -EINVAL;
591 		}
592 		ts->act_intrvl = dt_value;
593 	}
594 
595 	if (!device_property_read_u32(dev, "lowpower-interval-ms", &dt_value)) {
596 		if (dt_value > 2550) {
597 			dev_err(dev, "lowpower-interval-ms (%u) must be [0-2550]\n",
598 				dt_value);
599 			return -EINVAL;
600 		}
601 		/* Register value is expressed in 0.01s / bit */
602 		ts->lp_intrvl = dt_value / 10;
603 	}
604 
605 	if (!device_property_read_u32(dev, "touch-timeout-ms", &dt_value)) {
606 		if (dt_value > 2550) {
607 			dev_err(dev, "touch-timeout-ms (%u) must be [0-2550]\n",
608 				dt_value);
609 			return -EINVAL;
610 		}
611 		/* Register value is expressed in 0.01s / bit */
612 		ts->tch_tmout = dt_value / 10;
613 	}
614 
615 	return 0;
616 }
617 
618 static void cyttsp_disable_regulators(void *_ts)
619 {
620 	struct cyttsp *ts = _ts;
621 
622 	regulator_bulk_disable(ARRAY_SIZE(ts->regulators),
623 			       ts->regulators);
624 }
625 
626 struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
627 			    struct device *dev, int irq, size_t xfer_buf_size)
628 {
629 	struct cyttsp *ts;
630 	struct input_dev *input_dev;
631 	int error;
632 
633 	ts = devm_kzalloc(dev, sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
634 	if (!ts)
635 		return ERR_PTR(-ENOMEM);
636 
637 	input_dev = devm_input_allocate_device(dev);
638 	if (!input_dev)
639 		return ERR_PTR(-ENOMEM);
640 
641 	ts->dev = dev;
642 	ts->input = input_dev;
643 	ts->bus_ops = bus_ops;
644 	ts->irq = irq;
645 
646 	/*
647 	 * VCPIN is the analog voltage supply
648 	 * VDD is the digital voltage supply
649 	 */
650 	ts->regulators[0].supply = "vcpin";
651 	ts->regulators[1].supply = "vdd";
652 	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->regulators),
653 					ts->regulators);
654 	if (error) {
655 		dev_err(dev, "Failed to get regulators: %d\n", error);
656 		return ERR_PTR(error);
657 	}
658 
659 	error = regulator_bulk_enable(ARRAY_SIZE(ts->regulators),
660 				      ts->regulators);
661 	if (error) {
662 		dev_err(dev, "Cannot enable regulators: %d\n", error);
663 		return ERR_PTR(error);
664 	}
665 
666 	error = devm_add_action_or_reset(dev, cyttsp_disable_regulators, ts);
667 	if (error) {
668 		dev_err(dev, "failed to install chip disable handler\n");
669 		return ERR_PTR(error);
670 	}
671 
672 	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
673 	if (IS_ERR(ts->reset_gpio)) {
674 		error = PTR_ERR(ts->reset_gpio);
675 		dev_err(dev, "Failed to request reset gpio, error %d\n", error);
676 		return ERR_PTR(error);
677 	}
678 
679 	error = cyttsp_parse_properties(ts);
680 	if (error)
681 		return ERR_PTR(error);
682 
683 	init_completion(&ts->bl_ready);
684 
685 	input_dev->name = "Cypress TTSP TouchScreen";
686 	input_dev->id.bustype = bus_ops->bustype;
687 	input_dev->dev.parent = ts->dev;
688 
689 	input_dev->open = cyttsp_open;
690 	input_dev->close = cyttsp_close;
691 
692 	input_set_drvdata(input_dev, ts);
693 
694 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
695 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
696 	/* One byte for width 0..255 so this is the limit */
697 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
698 
699 	touchscreen_parse_properties(input_dev, true, NULL);
700 
701 	error = input_mt_init_slots(input_dev, CY_MAX_ID, INPUT_MT_DIRECT);
702 	if (error) {
703 		dev_err(dev, "Unable to init MT slots.\n");
704 		return ERR_PTR(error);
705 	}
706 
707 	error = devm_request_threaded_irq(dev, ts->irq, NULL, cyttsp_irq,
708 					  IRQF_ONESHOT | IRQF_NO_AUTOEN,
709 					  "cyttsp", ts);
710 	if (error) {
711 		dev_err(ts->dev, "failed to request IRQ %d, err: %d\n",
712 			ts->irq, error);
713 		return ERR_PTR(error);
714 	}
715 
716 	cyttsp_hard_reset(ts);
717 
718 	error = cyttsp_power_on(ts);
719 	if (error)
720 		return ERR_PTR(error);
721 
722 	error = input_register_device(input_dev);
723 	if (error) {
724 		dev_err(ts->dev, "failed to register input device: %d\n",
725 			error);
726 		return ERR_PTR(error);
727 	}
728 
729 	return ts;
730 }
731 EXPORT_SYMBOL_GPL(cyttsp_probe);
732 
733 MODULE_LICENSE("GPL");
734 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
735 MODULE_AUTHOR("Cypress");
736