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