xref: /linux/drivers/input/touchscreen/cyttsp_core.c (revision 9ae2940cbcb332aee3c9d9a0bb0f2d7dc6a82e44) 
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/interrupt.h>
21 #include <linux/slab.h>
22 #include <linux/property.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/regulator/consumer.h>
25 
26 #include "cyttsp_core.h"
27 
28 /* Bootloader number of command keys */
29 #define CY_NUM_BL_KEYS		8
30 
31 /* helpers */
32 #define GET_NUM_TOUCHES(x)		((x) & 0x0F)
33 #define IS_LARGE_AREA(x)		(((x) & 0x10) >> 4)
34 #define IS_BAD_PKT(x)			((x) & 0x20)
35 #define IS_VALID_APP(x)			((x) & 0x01)
36 #define IS_OPERATIONAL_ERR(x)		((x) & 0x3F)
37 #define GET_HSTMODE(reg)		(((reg) & 0x70) >> 4)
38 #define GET_BOOTLOADERMODE(reg)		(((reg) & 0x10) >> 4)
39 
40 #define CY_REG_BASE			0x00
41 #define CY_REG_ACT_DIST			0x1E
42 #define CY_REG_ACT_INTRVL		0x1D
43 #define CY_REG_TCH_TMOUT		(CY_REG_ACT_INTRVL + 1)
44 #define CY_REG_LP_INTRVL		(CY_REG_TCH_TMOUT + 1)
45 #define CY_MAXZ				255
46 #define CY_DELAY_DFLT			20 /* ms */
47 #define CY_DELAY_MAX			500
48 /* Active distance in pixels for a gesture to be reported */
49 #define CY_ACT_DIST_DFLT		0xF8 /* pixels */
50 #define CY_ACT_DIST_MASK		0x0F
51 /* Active Power state scanning/processing refresh interval */
52 #define CY_ACT_INTRVL_DFLT		0x00 /* ms */
53 /* Low Power state scanning/processing refresh interval */
54 #define CY_LP_INTRVL_DFLT		0x0A /* ms */
55 /* touch timeout for the Active power */
56 #define CY_TCH_TMOUT_DFLT		0xFF /* ms */
57 #define CY_HNDSHK_BIT			0x80
58 /* device mode bits */
59 #define CY_OPERATE_MODE			0x00
60 #define CY_SYSINFO_MODE			0x10
61 /* power mode select bits */
62 #define CY_SOFT_RESET_MODE		0x01 /* return to Bootloader mode */
63 #define CY_DEEP_SLEEP_MODE		0x02
64 #define CY_LOW_POWER_MODE		0x04
65 
66 /* Slots management */
67 #define CY_MAX_FINGER			4
68 #define CY_MAX_ID			16
69 
70 static const u8 bl_command[] = {
71 	0x00,			/* file offset */
72 	0xFF,			/* command */
73 	0xA5,			/* exit bootloader command */
74 	0, 1, 2, 3, 4, 5, 6, 7	/* default keys */
75 };
76 
77 static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
78 				u8 length, void *buf)
79 {
80 	int error;
81 	int tries;
82 
83 	for (tries = 0; tries < CY_NUM_RETRY; tries++) {
84 		error = ts->bus_ops->read(ts->dev, ts->xfer_buf, command,
85 				length, buf);
86 		if (!error)
87 			return 0;
88 
89 		msleep(CY_DELAY_DFLT);
90 	}
91 
92 	return -EIO;
93 }
94 
95 static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
96 				 u8 length, void *buf)
97 {
98 	int error;
99 	int tries;
100 
101 	for (tries = 0; tries < CY_NUM_RETRY; tries++) {
102 		error = ts->bus_ops->write(ts->dev, ts->xfer_buf, command,
103 				length, buf);
104 		if (!error)
105 			return 0;
106 
107 		msleep(CY_DELAY_DFLT);
108 	}
109 
110 	return -EIO;
111 }
112 
113 static int ttsp_send_command(struct cyttsp *ts, u8 cmd)
114 {
115 	return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
116 }
117 
118 static int cyttsp_handshake(struct cyttsp *ts)
119 {
120 	if (ts->use_hndshk)
121 		return ttsp_send_command(ts,
122 				ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);
123 
124 	return 0;
125 }
126 
127 static int cyttsp_load_bl_regs(struct cyttsp *ts)
128 {
129 	memset(&ts->bl_data, 0, sizeof(ts->bl_data));
130 	ts->bl_data.bl_status = 0x10;
131 
132 	return ttsp_read_block_data(ts, CY_REG_BASE,
133 				    sizeof(ts->bl_data), &ts->bl_data);
134 }
135 
136 static int cyttsp_exit_bl_mode(struct cyttsp *ts)
137 {
138 	int error;
139 	u8 bl_cmd[sizeof(bl_command)];
140 
141 	memcpy(bl_cmd, bl_command, sizeof(bl_command));
142 	if (ts->bl_keys)
143 		memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
144 			ts->bl_keys, CY_NUM_BL_KEYS);
145 
146 	error = ttsp_write_block_data(ts, CY_REG_BASE,
147 				      sizeof(bl_cmd), bl_cmd);
148 	if (error)
149 		return error;
150 
151 	/* wait for TTSP Device to complete the operation */
152 	msleep(CY_DELAY_DFLT);
153 
154 	error = cyttsp_load_bl_regs(ts);
155 	if (error)
156 		return error;
157 
158 	if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
159 		return -EIO;
160 
161 	return 0;
162 }
163 
164 static int cyttsp_set_operational_mode(struct cyttsp *ts)
165 {
166 	int error;
167 
168 	error = ttsp_send_command(ts, CY_OPERATE_MODE);
169 	if (error)
170 		return error;
171 
172 	/* wait for TTSP Device to complete switch to Operational mode */
173 	error = ttsp_read_block_data(ts, CY_REG_BASE,
174 				     sizeof(ts->xy_data), &ts->xy_data);
175 	if (error)
176 		return error;
177 
178 	error = cyttsp_handshake(ts);
179 	if (error)
180 		return error;
181 
182 	return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0;
183 }
184 
185 static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
186 {
187 	int error;
188 
189 	memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data));
190 
191 	/* switch to sysinfo mode */
192 	error = ttsp_send_command(ts, CY_SYSINFO_MODE);
193 	if (error)
194 		return error;
195 
196 	/* read sysinfo registers */
197 	msleep(CY_DELAY_DFLT);
198 	error = ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->sysinfo_data),
199 				      &ts->sysinfo_data);
200 	if (error)
201 		return error;
202 
203 	error = cyttsp_handshake(ts);
204 	if (error)
205 		return error;
206 
207 	if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl)
208 		return -EIO;
209 
210 	return 0;
211 }
212 
213 static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
214 {
215 	int retval = 0;
216 
217 	if (ts->act_intrvl != CY_ACT_INTRVL_DFLT ||
218 	    ts->tch_tmout != CY_TCH_TMOUT_DFLT ||
219 	    ts->lp_intrvl != CY_LP_INTRVL_DFLT) {
220 
221 		u8 intrvl_ray[] = {
222 			ts->act_intrvl,
223 			ts->tch_tmout,
224 			ts->lp_intrvl
225 		};
226 
227 		/* set intrvl registers */
228 		retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL,
229 					sizeof(intrvl_ray), intrvl_ray);
230 		msleep(CY_DELAY_DFLT);
231 	}
232 
233 	return retval;
234 }
235 
236 static void cyttsp_hard_reset(struct cyttsp *ts)
237 {
238 	if (ts->reset_gpio) {
239 		/*
240 		 * According to the CY8CTMA340 datasheet page 21, the external
241 		 * reset pulse width should be >= 1 ms. The datasheet does not
242 		 * specify how long we have to wait after reset but a vendor
243 		 * tree specifies 5 ms here.
244 		 */
245 		gpiod_set_value_cansleep(ts->reset_gpio, 1);
246 		usleep_range(1000, 2000);
247 		gpiod_set_value_cansleep(ts->reset_gpio, 0);
248 		usleep_range(5000, 6000);
249 	}
250 }
251 
252 static int cyttsp_soft_reset(struct cyttsp *ts)
253 {
254 	int retval;
255 
256 	/* wait for interrupt to set ready completion */
257 	reinit_completion(&ts->bl_ready);
258 	ts->state = CY_BL_STATE;
259 
260 	enable_irq(ts->irq);
261 
262 	retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE);
263 	if (retval) {
264 		dev_err(ts->dev, "failed to send soft reset\n");
265 		goto out;
266 	}
267 
268 	if (!wait_for_completion_timeout(&ts->bl_ready,
269 			msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX))) {
270 		dev_err(ts->dev, "timeout waiting for soft reset\n");
271 		retval = -EIO;
272 	}
273 
274 out:
275 	ts->state = CY_IDLE_STATE;
276 	disable_irq(ts->irq);
277 	return retval;
278 }
279 
280 static int cyttsp_act_dist_setup(struct cyttsp *ts)
281 {
282 	u8 act_dist_setup = ts->act_dist;
283 
284 	/* Init gesture; active distance setup */
285 	return ttsp_write_block_data(ts, CY_REG_ACT_DIST,
286 				sizeof(act_dist_setup), &act_dist_setup);
287 }
288 
289 static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids)
290 {
291 	ids[0] = xy_data->touch12_id >> 4;
292 	ids[1] = xy_data->touch12_id & 0xF;
293 	ids[2] = xy_data->touch34_id >> 4;
294 	ids[3] = xy_data->touch34_id & 0xF;
295 }
296 
297 static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data,
298 					       int idx)
299 {
300 	switch (idx) {
301 	case 0:
302 		return &xy_data->tch1;
303 	case 1:
304 		return &xy_data->tch2;
305 	case 2:
306 		return &xy_data->tch3;
307 	case 3:
308 		return &xy_data->tch4;
309 	default:
310 		return NULL;
311 	}
312 }
313 
314 static void cyttsp_report_tchdata(struct cyttsp *ts)
315 {
316 	struct cyttsp_xydata *xy_data = &ts->xy_data;
317 	struct input_dev *input = ts->input;
318 	int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat);
319 	const struct cyttsp_tch *tch;
320 	int ids[CY_MAX_ID];
321 	int i;
322 	DECLARE_BITMAP(used, CY_MAX_ID);
323 
324 	if (IS_LARGE_AREA(xy_data->tt_stat) == 1) {
325 		/* terminate all active tracks */
326 		num_tch = 0;
327 		dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
328 	} else if (num_tch > CY_MAX_FINGER) {
329 		/* terminate all active tracks */
330 		num_tch = 0;
331 		dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
332 	} else if (IS_BAD_PKT(xy_data->tt_mode)) {
333 		/* terminate all active tracks */
334 		num_tch = 0;
335 		dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
336 	}
337 
338 	cyttsp_extract_track_ids(xy_data, ids);
339 
340 	bitmap_zero(used, CY_MAX_ID);
341 
342 	for (i = 0; i < num_tch; i++) {
343 		tch = cyttsp_get_tch(xy_data, i);
344 
345 		input_mt_slot(input, ids[i]);
346 		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
347 		input_report_abs(input, ABS_MT_POSITION_X, be16_to_cpu(tch->x));
348 		input_report_abs(input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y));
349 		input_report_abs(input, ABS_MT_TOUCH_MAJOR, tch->z);
350 
351 		__set_bit(ids[i], used);
352 	}
353 
354 	for (i = 0; i < CY_MAX_ID; i++) {
355 		if (test_bit(i, used))
356 			continue;
357 
358 		input_mt_slot(input, i);
359 		input_mt_report_slot_inactive(input);
360 	}
361 
362 	input_sync(input);
363 }
364 
365 static irqreturn_t cyttsp_irq(int irq, void *handle)
366 {
367 	struct cyttsp *ts = handle;
368 	int error;
369 
370 	if (unlikely(ts->state == CY_BL_STATE)) {
371 		complete(&ts->bl_ready);
372 		goto out;
373 	}
374 
375 	/* Get touch data from CYTTSP device */
376 	error = ttsp_read_block_data(ts, CY_REG_BASE,
377 				 sizeof(struct cyttsp_xydata), &ts->xy_data);
378 	if (error)
379 		goto out;
380 
381 	/* provide flow control handshake */
382 	error = cyttsp_handshake(ts);
383 	if (error)
384 		goto out;
385 
386 	if (unlikely(ts->state == CY_IDLE_STATE))
387 		goto out;
388 
389 	if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
390 		/*
391 		 * TTSP device has reset back to bootloader mode.
392 		 * Restore to operational mode.
393 		 */
394 		error = cyttsp_exit_bl_mode(ts);
395 		if (error) {
396 			dev_err(ts->dev,
397 				"Could not return to operational mode, err: %d\n",
398 				error);
399 			ts->state = CY_IDLE_STATE;
400 		}
401 	} else {
402 		cyttsp_report_tchdata(ts);
403 	}
404 
405 out:
406 	return IRQ_HANDLED;
407 }
408 
409 static int cyttsp_power_on(struct cyttsp *ts)
410 {
411 	int error;
412 
413 	error = cyttsp_soft_reset(ts);
414 	if (error)
415 		return error;
416 
417 	error = cyttsp_load_bl_regs(ts);
418 	if (error)
419 		return error;
420 
421 	if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) &&
422 	    IS_VALID_APP(ts->bl_data.bl_status)) {
423 		error = cyttsp_exit_bl_mode(ts);
424 		if (error) {
425 			dev_err(ts->dev, "failed to exit bootloader mode\n");
426 			return error;
427 		}
428 	}
429 
430 	if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE ||
431 	    IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) {
432 		return -ENODEV;
433 	}
434 
435 	error = cyttsp_set_sysinfo_mode(ts);
436 	if (error)
437 		return error;
438 
439 	error = cyttsp_set_sysinfo_regs(ts);
440 	if (error)
441 		return error;
442 
443 	error = cyttsp_set_operational_mode(ts);
444 	if (error)
445 		return error;
446 
447 	/* init active distance */
448 	error = cyttsp_act_dist_setup(ts);
449 	if (error)
450 		return error;
451 
452 	ts->state = CY_ACTIVE_STATE;
453 
454 	return 0;
455 }
456 
457 static int cyttsp_enable(struct cyttsp *ts)
458 {
459 	int error;
460 
461 	/*
462 	 * The device firmware can wake on an I2C or SPI memory slave
463 	 * address match. So just reading a register is sufficient to
464 	 * wake up the device. The first read attempt will fail but it
465 	 * will wake it up making the second read attempt successful.
466 	 */
467 	error = ttsp_read_block_data(ts, CY_REG_BASE,
468 				     sizeof(ts->xy_data), &ts->xy_data);
469 	if (error)
470 		return error;
471 
472 	if (GET_HSTMODE(ts->xy_data.hst_mode))
473 		return -EIO;
474 
475 	enable_irq(ts->irq);
476 
477 	return 0;
478 }
479 
480 static int cyttsp_disable(struct cyttsp *ts)
481 {
482 	int error;
483 
484 	error = ttsp_send_command(ts, CY_LOW_POWER_MODE);
485 	if (error)
486 		return error;
487 
488 	disable_irq(ts->irq);
489 
490 	return 0;
491 }
492 
493 static int cyttsp_suspend(struct device *dev)
494 {
495 	struct cyttsp *ts = dev_get_drvdata(dev);
496 	int retval = 0;
497 
498 	mutex_lock(&ts->input->mutex);
499 
500 	if (input_device_enabled(ts->input)) {
501 		retval = cyttsp_disable(ts);
502 		if (retval == 0)
503 			ts->suspended = true;
504 	}
505 
506 	mutex_unlock(&ts->input->mutex);
507 
508 	return retval;
509 }
510 
511 static int cyttsp_resume(struct device *dev)
512 {
513 	struct cyttsp *ts = dev_get_drvdata(dev);
514 
515 	mutex_lock(&ts->input->mutex);
516 
517 	if (input_device_enabled(ts->input))
518 		cyttsp_enable(ts);
519 
520 	ts->suspended = false;
521 
522 	mutex_unlock(&ts->input->mutex);
523 
524 	return 0;
525 }
526 
527 EXPORT_GPL_SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume);
528 
529 static int cyttsp_open(struct input_dev *dev)
530 {
531 	struct cyttsp *ts = input_get_drvdata(dev);
532 	int retval = 0;
533 
534 	if (!ts->suspended)
535 		retval = cyttsp_enable(ts);
536 
537 	return retval;
538 }
539 
540 static void cyttsp_close(struct input_dev *dev)
541 {
542 	struct cyttsp *ts = input_get_drvdata(dev);
543 
544 	if (!ts->suspended)
545 		cyttsp_disable(ts);
546 }
547 
548 static int cyttsp_parse_properties(struct cyttsp *ts)
549 {
550 	struct device *dev = ts->dev;
551 	u32 dt_value;
552 	int ret;
553 
554 	ts->bl_keys = devm_kzalloc(dev, CY_NUM_BL_KEYS, GFP_KERNEL);
555 	if (!ts->bl_keys)
556 		return -ENOMEM;
557 
558 	/* Set some default values */
559 	ts->use_hndshk = false;
560 	ts->act_dist = CY_ACT_DIST_DFLT;
561 	ts->act_intrvl = CY_ACT_INTRVL_DFLT;
562 	ts->tch_tmout = CY_TCH_TMOUT_DFLT;
563 	ts->lp_intrvl = CY_LP_INTRVL_DFLT;
564 
565 	ret = device_property_read_u8_array(dev, "bootloader-key",
566 					    ts->bl_keys, CY_NUM_BL_KEYS);
567 	if (ret) {
568 		dev_err(dev,
569 			"bootloader-key property could not be retrieved\n");
570 		return ret;
571 	}
572 
573 	ts->use_hndshk = device_property_present(dev, "use-handshake");
574 
575 	if (!device_property_read_u32(dev, "active-distance", &dt_value)) {
576 		if (dt_value > 15) {
577 			dev_err(dev, "active-distance (%u) must be [0-15]\n",
578 				dt_value);
579 			return -EINVAL;
580 		}
581 		ts->act_dist &= ~CY_ACT_DIST_MASK;
582 		ts->act_dist |= dt_value;
583 	}
584 
585 	if (!device_property_read_u32(dev, "active-interval-ms", &dt_value)) {
586 		if (dt_value > 255) {
587 			dev_err(dev, "active-interval-ms (%u) must be [0-255]\n",
588 				dt_value);
589 			return -EINVAL;
590 		}
591 		ts->act_intrvl = dt_value;
592 	}
593 
594 	if (!device_property_read_u32(dev, "lowpower-interval-ms", &dt_value)) {
595 		if (dt_value > 2550) {
596 			dev_err(dev, "lowpower-interval-ms (%u) must be [0-2550]\n",
597 				dt_value);
598 			return -EINVAL;
599 		}
600 		/* Register value is expressed in 0.01s / bit */
601 		ts->lp_intrvl = dt_value / 10;
602 	}
603 
604 	if (!device_property_read_u32(dev, "touch-timeout-ms", &dt_value)) {
605 		if (dt_value > 2550) {
606 			dev_err(dev, "touch-timeout-ms (%u) must be [0-2550]\n",
607 				dt_value);
608 			return -EINVAL;
609 		}
610 		/* Register value is expressed in 0.01s / bit */
611 		ts->tch_tmout = dt_value / 10;
612 	}
613 
614 	return 0;
615 }
616 
617 struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
618 			    struct device *dev, int irq, size_t xfer_buf_size)
619 {
620 	/*
621 	 * VCPIN is the analog voltage supply
622 	 * VDD is the digital voltage supply
623 	 */
624 	static const char * const supplies[] = { "vcpin", "vdd" };
625 	struct cyttsp *ts;
626 	struct input_dev *input_dev;
627 	int error;
628 
629 	ts = devm_kzalloc(dev, sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
630 	if (!ts)
631 		return ERR_PTR(-ENOMEM);
632 
633 	input_dev = devm_input_allocate_device(dev);
634 	if (!input_dev)
635 		return ERR_PTR(-ENOMEM);
636 
637 	ts->dev = dev;
638 	ts->input = input_dev;
639 	ts->bus_ops = bus_ops;
640 	ts->irq = irq;
641 
642 	error = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies),
643 					       supplies);
644 	if (error) {
645 		dev_err(dev, "Failed to enable regulators: %d\n", error);
646 		return ERR_PTR(error);
647 	}
648 
649 	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
650 	if (IS_ERR(ts->reset_gpio)) {
651 		error = PTR_ERR(ts->reset_gpio);
652 		dev_err(dev, "Failed to request reset gpio, error %d\n", error);
653 		return ERR_PTR(error);
654 	}
655 
656 	error = cyttsp_parse_properties(ts);
657 	if (error)
658 		return ERR_PTR(error);
659 
660 	init_completion(&ts->bl_ready);
661 
662 	input_dev->name = "Cypress TTSP TouchScreen";
663 	input_dev->id.bustype = bus_ops->bustype;
664 	input_dev->dev.parent = ts->dev;
665 
666 	input_dev->open = cyttsp_open;
667 	input_dev->close = cyttsp_close;
668 
669 	input_set_drvdata(input_dev, ts);
670 
671 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
672 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
673 	/* One byte for width 0..255 so this is the limit */
674 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
675 
676 	touchscreen_parse_properties(input_dev, true, NULL);
677 
678 	error = input_mt_init_slots(input_dev, CY_MAX_ID, INPUT_MT_DIRECT);
679 	if (error) {
680 		dev_err(dev, "Unable to init MT slots.\n");
681 		return ERR_PTR(error);
682 	}
683 
684 	error = devm_request_threaded_irq(dev, ts->irq, NULL, cyttsp_irq,
685 					  IRQF_ONESHOT | IRQF_NO_AUTOEN,
686 					  "cyttsp", ts);
687 	if (error) {
688 		dev_err(ts->dev, "failed to request IRQ %d, err: %d\n",
689 			ts->irq, error);
690 		return ERR_PTR(error);
691 	}
692 
693 	cyttsp_hard_reset(ts);
694 
695 	error = cyttsp_power_on(ts);
696 	if (error)
697 		return ERR_PTR(error);
698 
699 	error = input_register_device(input_dev);
700 	if (error) {
701 		dev_err(ts->dev, "failed to register input device: %d\n",
702 			error);
703 		return ERR_PTR(error);
704 	}
705 
706 	return ts;
707 }
708 EXPORT_SYMBOL_GPL(cyttsp_probe);
709 
710 MODULE_LICENSE("GPL");
711 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
712 MODULE_AUTHOR("Cypress");
713