xref: /linux/drivers/input/mouse/synaptics.c (revision 59fff63cc2b75dcfe08f9eeb4b2187d73e53843d)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Synaptics TouchPad PS/2 mouse driver
4  *
5  *   2003 Dmitry Torokhov <dtor@mail.ru>
6  *     Added support for pass-through port. Special thanks to Peter Berg Larsen
7  *     for explaining various Synaptics quirks.
8  *
9  *   2003 Peter Osterlund <petero2@telia.com>
10  *     Ported to 2.5 input device infrastructure.
11  *
12  *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
13  *     start merging tpconfig and gpm code to a xfree-input module
14  *     adding some changes and extensions (ex. 3rd and 4th button)
15  *
16  *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
17  *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
18  *     code for the special synaptics commands (from the tpconfig-source)
19  *
20  * Trademarks are the property of their respective owners.
21  */
22 
23 #include <linux/module.h>
24 #include <linux/delay.h>
25 #include <linux/dmi.h>
26 #include <linux/input/mt.h>
27 #include <linux/serio.h>
28 #include <linux/libps2.h>
29 #include <linux/rmi.h>
30 #include <linux/i2c.h>
31 #include <linux/slab.h>
32 #include "psmouse.h"
33 #include "synaptics.h"
34 
35 /*
36  * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
37  * section 2.3.2, which says that they should be valid regardless of the
38  * actual size of the sensor.
39  * Note that newer firmware allows querying device for maximum useable
40  * coordinates.
41  */
42 #define XMIN 0
43 #define XMAX 6143
44 #define YMIN 0
45 #define YMAX 6143
46 #define XMIN_NOMINAL 1472
47 #define XMAX_NOMINAL 5472
48 #define YMIN_NOMINAL 1408
49 #define YMAX_NOMINAL 4448
50 
51 /* Size in bits of absolute position values reported by the hardware */
52 #define ABS_POS_BITS 13
53 
54 /*
55  * These values should represent the absolute maximum value that will
56  * be reported for a positive position value. Some Synaptics firmware
57  * uses this value to indicate a finger near the edge of the touchpad
58  * whose precise position cannot be determined.
59  *
60  * At least one touchpad is known to report positions in excess of this
61  * value which are actually negative values truncated to the 13-bit
62  * reporting range. These values have never been observed to be lower
63  * than 8184 (i.e. -8), so we treat all values greater than 8176 as
64  * negative and any other value as positive.
65  */
66 #define X_MAX_POSITIVE 8176
67 #define Y_MAX_POSITIVE 8176
68 
69 /* maximum ABS_MT_POSITION displacement (in mm) */
70 #define DMAX 10
71 
72 /*****************************************************************************
73  *	Stuff we need even when we do not want native Synaptics support
74  ****************************************************************************/
75 
76 /*
77  * Set the synaptics touchpad mode byte by special commands
78  */
79 static int synaptics_mode_cmd(struct psmouse *psmouse, u8 mode)
80 {
81 	u8 param[1];
82 	int error;
83 
84 	error = ps2_sliced_command(&psmouse->ps2dev, mode);
85 	if (error)
86 		return error;
87 
88 	param[0] = SYN_PS_SET_MODE2;
89 	error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE);
90 	if (error)
91 		return error;
92 
93 	return 0;
94 }
95 
96 int synaptics_detect(struct psmouse *psmouse, bool set_properties)
97 {
98 	struct ps2dev *ps2dev = &psmouse->ps2dev;
99 	u8 param[4] = { 0 };
100 
101 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
102 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
103 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
104 	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
105 	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
106 
107 	if (param[1] != 0x47)
108 		return -ENODEV;
109 
110 	if (set_properties) {
111 		psmouse->vendor = "Synaptics";
112 		psmouse->name = "TouchPad";
113 	}
114 
115 	return 0;
116 }
117 
118 void synaptics_reset(struct psmouse *psmouse)
119 {
120 	/* reset touchpad back to relative mode, gestures enabled */
121 	synaptics_mode_cmd(psmouse, 0);
122 }
123 
124 #if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
125     defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
126 
127 /* This list has been kindly provided by Synaptics. */
128 static const char * const topbuttonpad_pnp_ids[] = {
129 	"LEN0017",
130 	"LEN0018",
131 	"LEN0019",
132 	"LEN0023",
133 	"LEN002A",
134 	"LEN002B",
135 	"LEN002C",
136 	"LEN002D",
137 	"LEN002E",
138 	"LEN0033", /* Helix */
139 	"LEN0034", /* T431s, L440, L540, T540, W540, X1 Carbon 2nd */
140 	"LEN0035", /* X240 */
141 	"LEN0036", /* T440 */
142 	"LEN0037", /* X1 Carbon 2nd */
143 	"LEN0038",
144 	"LEN0039", /* T440s */
145 	"LEN0041",
146 	"LEN0042", /* Yoga */
147 	"LEN0045",
148 	"LEN0047",
149 	"LEN2000", /* S540 */
150 	"LEN2001", /* Edge E431 */
151 	"LEN2002", /* Edge E531 */
152 	"LEN2003",
153 	"LEN2004", /* L440 */
154 	"LEN2005",
155 	"LEN2006", /* Edge E440/E540 */
156 	"LEN2007",
157 	"LEN2008",
158 	"LEN2009",
159 	"LEN200A",
160 	"LEN200B",
161 	NULL
162 };
163 
164 static const char * const smbus_pnp_ids[] = {
165 	/* all of the topbuttonpad_pnp_ids are valid, we just add some extras */
166 	"LEN0048", /* X1 Carbon 3 */
167 	"LEN0046", /* X250 */
168 	"LEN0049", /* Yoga 11e */
169 	"LEN004a", /* W541 */
170 	"LEN005b", /* P50 */
171 	"LEN005e", /* T560 */
172 	"LEN006c", /* T470s */
173 	"LEN007a", /* T470s */
174 	"LEN0071", /* T480 */
175 	"LEN0072", /* X1 Carbon Gen 5 (2017) - Elan/ALPS trackpoint */
176 	"LEN0073", /* X1 Carbon G5 (Elantech) */
177 	"LEN0091", /* X1 Carbon 6 */
178 	"LEN0092", /* X1 Carbon 6 */
179 	"LEN0093", /* T480 */
180 	"LEN0096", /* X280 */
181 	"LEN0097", /* X280 -> ALPS trackpoint */
182 	"LEN0099", /* X1 Extreme Gen 1 / P1 Gen 1 */
183 	"LEN009b", /* T580 */
184 	"LEN0402", /* X1 Extreme Gen 2 / P1 Gen 2 */
185 	"LEN040f", /* P1 Gen 3 */
186 	"LEN200f", /* T450s */
187 	"LEN2044", /* L470  */
188 	"LEN2054", /* E480 */
189 	"LEN2055", /* E580 */
190 	"LEN2068", /* T14 Gen 1 */
191 	"SYN3052", /* HP EliteBook 840 G4 */
192 	"SYN3221", /* HP 15-ay000 */
193 	"SYN323d", /* HP Spectre X360 13-w013dx */
194 	"SYN3257", /* HP Envy 13-ad105ng */
195 	NULL
196 };
197 
198 static const char * const forcepad_pnp_ids[] = {
199 	"SYN300D",
200 	"SYN3014",
201 	NULL
202 };
203 
204 /*
205  * Send a command to the synaptics touchpad by special commands
206  */
207 static int synaptics_send_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
208 {
209 	int error;
210 
211 	error = ps2_sliced_command(&psmouse->ps2dev, cmd);
212 	if (error)
213 		return error;
214 
215 	error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO);
216 	if (error)
217 		return error;
218 
219 	return 0;
220 }
221 
222 static int synaptics_query_int(struct psmouse *psmouse, u8 query_cmd, u32 *val)
223 {
224 	int error;
225 	union {
226 		__be32 be_val;
227 		char buf[4];
228 	} resp = { 0 };
229 
230 	error = synaptics_send_cmd(psmouse, query_cmd, resp.buf + 1);
231 	if (error)
232 		return error;
233 
234 	*val = be32_to_cpu(resp.be_val);
235 	return 0;
236 }
237 
238 /*
239  * Identify Touchpad
240  * See also the SYN_ID_* macros
241  */
242 static int synaptics_identify(struct psmouse *psmouse,
243 			      struct synaptics_device_info *info)
244 {
245 	int error;
246 
247 	error = synaptics_query_int(psmouse, SYN_QUE_IDENTIFY, &info->identity);
248 	if (error)
249 		return error;
250 
251 	return SYN_ID_IS_SYNAPTICS(info->identity) ? 0 : -ENXIO;
252 }
253 
254 /*
255  * Read the model-id bytes from the touchpad
256  * see also SYN_MODEL_* macros
257  */
258 static int synaptics_model_id(struct psmouse *psmouse,
259 			      struct synaptics_device_info *info)
260 {
261 	return synaptics_query_int(psmouse, SYN_QUE_MODEL, &info->model_id);
262 }
263 
264 /*
265  * Read the firmware id from the touchpad
266  */
267 static int synaptics_firmware_id(struct psmouse *psmouse,
268 				 struct synaptics_device_info *info)
269 {
270 	return synaptics_query_int(psmouse, SYN_QUE_FIRMWARE_ID,
271 				   &info->firmware_id);
272 }
273 
274 /*
275  * Read the board id and the "More Extended Queries" from the touchpad
276  * The board id is encoded in the "QUERY MODES" response
277  */
278 static int synaptics_query_modes(struct psmouse *psmouse,
279 				 struct synaptics_device_info *info)
280 {
281 	u8 bid[3];
282 	int error;
283 
284 	/* firmwares prior 7.5 have no board_id encoded */
285 	if (SYN_ID_FULL(info->identity) < 0x705)
286 		return 0;
287 
288 	error = synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid);
289 	if (error)
290 		return error;
291 
292 	info->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
293 
294 	if (SYN_MEXT_CAP_BIT(bid[0]))
295 		return synaptics_query_int(psmouse, SYN_QUE_MEXT_CAPAB_10,
296 					   &info->ext_cap_10);
297 
298 	return 0;
299 }
300 
301 /*
302  * Read the capability-bits from the touchpad
303  * see also the SYN_CAP_* macros
304  */
305 static int synaptics_capability(struct psmouse *psmouse,
306 				struct synaptics_device_info *info)
307 {
308 	int error;
309 
310 	error = synaptics_query_int(psmouse, SYN_QUE_CAPABILITIES,
311 				    &info->capabilities);
312 	if (error)
313 		return error;
314 
315 	info->ext_cap = info->ext_cap_0c = 0;
316 
317 	/*
318 	 * Older firmwares had submodel ID fixed to 0x47
319 	 */
320 	if (SYN_ID_FULL(info->identity) < 0x705 &&
321 	    SYN_CAP_SUBMODEL_ID(info->capabilities) != 0x47) {
322 		return -ENXIO;
323 	}
324 
325 	/*
326 	 * Unless capExtended is set the rest of the flags should be ignored
327 	 */
328 	if (!SYN_CAP_EXTENDED(info->capabilities))
329 		info->capabilities = 0;
330 
331 	if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 1) {
332 		error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB,
333 					    &info->ext_cap);
334 		if (error) {
335 			psmouse_warn(psmouse,
336 				     "device claims to have extended capabilities, but I'm not able to read them.\n");
337 		} else {
338 			/*
339 			 * if nExtBtn is greater than 8 it should be considered
340 			 * invalid and treated as 0
341 			 */
342 			if (SYN_CAP_MULTI_BUTTON_NO(info->ext_cap) > 8)
343 				info->ext_cap &= ~SYN_CAP_MB_MASK;
344 		}
345 	}
346 
347 	if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 4) {
348 		error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB_0C,
349 					    &info->ext_cap_0c);
350 		if (error)
351 			psmouse_warn(psmouse,
352 				     "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
353 	}
354 
355 	return 0;
356 }
357 
358 /*
359  * Read touchpad resolution and maximum reported coordinates
360  * Resolution is left zero if touchpad does not support the query
361  */
362 static int synaptics_resolution(struct psmouse *psmouse,
363 				struct synaptics_device_info *info)
364 {
365 	u8 resp[3];
366 	int error;
367 
368 	if (SYN_ID_MAJOR(info->identity) < 4)
369 		return 0;
370 
371 	error = synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp);
372 	if (!error) {
373 		if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
374 			info->x_res = resp[0]; /* x resolution in units/mm */
375 			info->y_res = resp[2]; /* y resolution in units/mm */
376 		}
377 	}
378 
379 	if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 5 &&
380 	    SYN_CAP_MAX_DIMENSIONS(info->ext_cap_0c)) {
381 		error = synaptics_send_cmd(psmouse,
382 					   SYN_QUE_EXT_MAX_COORDS, resp);
383 		if (error) {
384 			psmouse_warn(psmouse,
385 				     "device claims to have max coordinates query, but I'm not able to read it.\n");
386 		} else {
387 			info->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
388 			info->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
389 			psmouse_info(psmouse,
390 				     "queried max coordinates: x [..%d], y [..%d]\n",
391 				     info->x_max, info->y_max);
392 		}
393 	}
394 
395 	if (SYN_CAP_MIN_DIMENSIONS(info->ext_cap_0c) &&
396 	    (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 7 ||
397 	     /*
398 	      * Firmware v8.1 does not report proper number of extended
399 	      * capabilities, but has been proven to report correct min
400 	      * coordinates.
401 	      */
402 	     SYN_ID_FULL(info->identity) == 0x801)) {
403 		error = synaptics_send_cmd(psmouse,
404 					   SYN_QUE_EXT_MIN_COORDS, resp);
405 		if (error) {
406 			psmouse_warn(psmouse,
407 				     "device claims to have min coordinates query, but I'm not able to read it.\n");
408 		} else {
409 			info->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
410 			info->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
411 			psmouse_info(psmouse,
412 				     "queried min coordinates: x [%d..], y [%d..]\n",
413 				     info->x_min, info->y_min);
414 		}
415 	}
416 
417 	return 0;
418 }
419 
420 static int synaptics_query_hardware(struct psmouse *psmouse,
421 				    struct synaptics_device_info *info)
422 {
423 	int error;
424 
425 	memset(info, 0, sizeof(*info));
426 
427 	error = synaptics_identify(psmouse, info);
428 	if (error)
429 		return error;
430 
431 	error = synaptics_model_id(psmouse, info);
432 	if (error)
433 		return error;
434 
435 	error = synaptics_firmware_id(psmouse, info);
436 	if (error)
437 		return error;
438 
439 	error = synaptics_query_modes(psmouse, info);
440 	if (error)
441 		return error;
442 
443 	error = synaptics_capability(psmouse, info);
444 	if (error)
445 		return error;
446 
447 	error = synaptics_resolution(psmouse, info);
448 	if (error)
449 		return error;
450 
451 	return 0;
452 }
453 
454 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
455 
456 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
457 
458 static bool cr48_profile_sensor;
459 
460 #define ANY_BOARD_ID 0
461 struct min_max_quirk {
462 	const char * const *pnp_ids;
463 	struct {
464 		u32 min, max;
465 	} board_id;
466 	u32 x_min, x_max, y_min, y_max;
467 };
468 
469 static const struct min_max_quirk min_max_pnpid_table[] = {
470 	{
471 		(const char * const []){"LEN0033", NULL},
472 		{ANY_BOARD_ID, ANY_BOARD_ID},
473 		1024, 5052, 2258, 4832
474 	},
475 	{
476 		(const char * const []){"LEN0042", NULL},
477 		{ANY_BOARD_ID, ANY_BOARD_ID},
478 		1232, 5710, 1156, 4696
479 	},
480 	{
481 		(const char * const []){"LEN0034", "LEN0036", "LEN0037",
482 					"LEN0039", "LEN2002", "LEN2004",
483 					NULL},
484 		{ANY_BOARD_ID, 2961},
485 		1024, 5112, 2024, 4832
486 	},
487 	{
488 		(const char * const []){"LEN2000", NULL},
489 		{ANY_BOARD_ID, ANY_BOARD_ID},
490 		1024, 5113, 2021, 4832
491 	},
492 	{
493 		(const char * const []){"LEN2001", NULL},
494 		{ANY_BOARD_ID, ANY_BOARD_ID},
495 		1024, 5022, 2508, 4832
496 	},
497 	{
498 		(const char * const []){"LEN2006", NULL},
499 		{2691, 2691},
500 		1024, 5045, 2457, 4832
501 	},
502 	{
503 		(const char * const []){"LEN2006", NULL},
504 		{ANY_BOARD_ID, ANY_BOARD_ID},
505 		1264, 5675, 1171, 4688
506 	},
507 	{ }
508 };
509 
510 /*****************************************************************************
511  *	Synaptics communications functions
512  ****************************************************************************/
513 
514 /*
515  * Synaptics touchpads report the y coordinate from bottom to top, which is
516  * opposite from what userspace expects.
517  * This function is used to invert y before reporting.
518  */
519 static int synaptics_invert_y(int y)
520 {
521 	return YMAX_NOMINAL + YMIN_NOMINAL - y;
522 }
523 
524 /*
525  * Apply quirk(s) if the hardware matches
526  */
527 static void synaptics_apply_quirks(struct psmouse *psmouse,
528 				   struct synaptics_device_info *info)
529 {
530 	int i;
531 
532 	for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
533 		if (!psmouse_matches_pnp_id(psmouse,
534 					    min_max_pnpid_table[i].pnp_ids))
535 			continue;
536 
537 		if (min_max_pnpid_table[i].board_id.min != ANY_BOARD_ID &&
538 		    info->board_id < min_max_pnpid_table[i].board_id.min)
539 			continue;
540 
541 		if (min_max_pnpid_table[i].board_id.max != ANY_BOARD_ID &&
542 		    info->board_id > min_max_pnpid_table[i].board_id.max)
543 			continue;
544 
545 		info->x_min = min_max_pnpid_table[i].x_min;
546 		info->x_max = min_max_pnpid_table[i].x_max;
547 		info->y_min = min_max_pnpid_table[i].y_min;
548 		info->y_max = min_max_pnpid_table[i].y_max;
549 		psmouse_info(psmouse,
550 			     "quirked min/max coordinates: x [%d..%d], y [%d..%d]\n",
551 			     info->x_min, info->x_max,
552 			     info->y_min, info->y_max);
553 		break;
554 	}
555 }
556 
557 static bool synaptics_has_agm(struct synaptics_data *priv)
558 {
559 	return (SYN_CAP_ADV_GESTURE(priv->info.ext_cap_0c) ||
560 		SYN_CAP_IMAGE_SENSOR(priv->info.ext_cap_0c));
561 }
562 
563 static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
564 {
565 	static u8 param = 0xc8;
566 	int error;
567 
568 	error = ps2_sliced_command(&psmouse->ps2dev, SYN_QUE_MODEL);
569 	if (error)
570 		return error;
571 
572 	error = ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE);
573 	if (error)
574 		return error;
575 
576 	return 0;
577 }
578 
579 static int synaptics_set_mode(struct psmouse *psmouse)
580 {
581 	struct synaptics_data *priv = psmouse->private;
582 	int error;
583 
584 	priv->mode = 0;
585 	if (priv->absolute_mode)
586 		priv->mode |= SYN_BIT_ABSOLUTE_MODE;
587 	if (priv->disable_gesture)
588 		priv->mode |= SYN_BIT_DISABLE_GESTURE;
589 	if (psmouse->rate >= 80)
590 		priv->mode |= SYN_BIT_HIGH_RATE;
591 	if (SYN_CAP_EXTENDED(priv->info.capabilities))
592 		priv->mode |= SYN_BIT_W_MODE;
593 
594 	error = synaptics_mode_cmd(psmouse, priv->mode);
595 	if (error)
596 		return error;
597 
598 	if (priv->absolute_mode && synaptics_has_agm(priv)) {
599 		error = synaptics_set_advanced_gesture_mode(psmouse);
600 		if (error) {
601 			psmouse_err(psmouse,
602 				    "Advanced gesture mode init failed: %d\n",
603 				    error);
604 			return error;
605 		}
606 	}
607 
608 	return 0;
609 }
610 
611 static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
612 {
613 	struct synaptics_data *priv = psmouse->private;
614 
615 	if (rate >= 80) {
616 		priv->mode |= SYN_BIT_HIGH_RATE;
617 		psmouse->rate = 80;
618 	} else {
619 		priv->mode &= ~SYN_BIT_HIGH_RATE;
620 		psmouse->rate = 40;
621 	}
622 
623 	synaptics_mode_cmd(psmouse, priv->mode);
624 }
625 
626 /*****************************************************************************
627  *	Synaptics pass-through PS/2 port support
628  ****************************************************************************/
629 static int synaptics_pt_write(struct serio *serio, u8 c)
630 {
631 	struct psmouse *parent = psmouse_from_serio(serio->parent);
632 	u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
633 	int error;
634 
635 	error = ps2_sliced_command(&parent->ps2dev, c);
636 	if (error)
637 		return error;
638 
639 	error = ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
640 	if (error)
641 		return error;
642 
643 	return 0;
644 }
645 
646 static int synaptics_pt_start(struct serio *serio)
647 {
648 	struct psmouse *parent = psmouse_from_serio(serio->parent);
649 	struct synaptics_data *priv = parent->private;
650 
651 	serio_pause_rx(parent->ps2dev.serio);
652 	priv->pt_port = serio;
653 	serio_continue_rx(parent->ps2dev.serio);
654 
655 	return 0;
656 }
657 
658 static void synaptics_pt_stop(struct serio *serio)
659 {
660 	struct psmouse *parent = psmouse_from_serio(serio->parent);
661 	struct synaptics_data *priv = parent->private;
662 
663 	serio_pause_rx(parent->ps2dev.serio);
664 	priv->pt_port = NULL;
665 	serio_continue_rx(parent->ps2dev.serio);
666 }
667 
668 static int synaptics_is_pt_packet(u8 *buf)
669 {
670 	return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
671 }
672 
673 static void synaptics_pass_pt_packet(struct serio *ptport, u8 *packet)
674 {
675 	struct psmouse *child = psmouse_from_serio(ptport);
676 
677 	if (child && child->state == PSMOUSE_ACTIVATED) {
678 		serio_interrupt(ptport, packet[1], 0);
679 		serio_interrupt(ptport, packet[4], 0);
680 		serio_interrupt(ptport, packet[5], 0);
681 		if (child->pktsize == 4)
682 			serio_interrupt(ptport, packet[2], 0);
683 	} else {
684 		serio_interrupt(ptport, packet[1], 0);
685 	}
686 }
687 
688 static void synaptics_pt_activate(struct psmouse *psmouse)
689 {
690 	struct synaptics_data *priv = psmouse->private;
691 	struct psmouse *child = psmouse_from_serio(priv->pt_port);
692 
693 	/* adjust the touchpad to child's choice of protocol */
694 	if (child) {
695 		if (child->pktsize == 4)
696 			priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
697 		else
698 			priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
699 
700 		if (synaptics_mode_cmd(psmouse, priv->mode))
701 			psmouse_warn(psmouse,
702 				     "failed to switch guest protocol\n");
703 	}
704 }
705 
706 static void synaptics_pt_create(struct psmouse *psmouse)
707 {
708 	struct serio *serio;
709 
710 	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
711 	if (!serio) {
712 		psmouse_err(psmouse,
713 			    "not enough memory for pass-through port\n");
714 		return;
715 	}
716 
717 	serio->id.type = SERIO_PS_PSTHRU;
718 	strscpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
719 	strscpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->phys));
720 	serio->write = synaptics_pt_write;
721 	serio->start = synaptics_pt_start;
722 	serio->stop = synaptics_pt_stop;
723 	serio->parent = psmouse->ps2dev.serio;
724 
725 	psmouse->pt_activate = synaptics_pt_activate;
726 
727 	psmouse_info(psmouse, "serio: %s port at %s\n",
728 		     serio->name, psmouse->phys);
729 	serio_register_port(serio);
730 }
731 
732 /*****************************************************************************
733  *	Functions to interpret the absolute mode packets
734  ****************************************************************************/
735 
736 static void synaptics_parse_agm(const u8 buf[],
737 				struct synaptics_data *priv,
738 				struct synaptics_hw_state *hw)
739 {
740 	struct synaptics_hw_state *agm = &priv->agm;
741 	int agm_packet_type;
742 
743 	agm_packet_type = (buf[5] & 0x30) >> 4;
744 	switch (agm_packet_type) {
745 	case 1:
746 		/* Gesture packet: (x, y, z) half resolution */
747 		agm->w = hw->w;
748 		agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
749 		agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
750 		agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
751 		break;
752 
753 	case 2:
754 		/* AGM-CONTACT packet: we are only interested in the count */
755 		priv->agm_count = buf[1];
756 		break;
757 
758 	default:
759 		break;
760 	}
761 }
762 
763 static void synaptics_parse_ext_buttons(const u8 buf[],
764 					struct synaptics_data *priv,
765 					struct synaptics_hw_state *hw)
766 {
767 	unsigned int ext_bits =
768 		(SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
769 	unsigned int ext_mask = GENMASK(ext_bits - 1, 0);
770 
771 	hw->ext_buttons = buf[4] & ext_mask;
772 	hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
773 }
774 
775 static int synaptics_parse_hw_state(const u8 buf[],
776 				    struct synaptics_data *priv,
777 				    struct synaptics_hw_state *hw)
778 {
779 	memset(hw, 0, sizeof(struct synaptics_hw_state));
780 
781 	if (SYN_MODEL_NEWABS(priv->info.model_id)) {
782 		hw->w = (((buf[0] & 0x30) >> 2) |
783 			 ((buf[0] & 0x04) >> 1) |
784 			 ((buf[3] & 0x04) >> 2));
785 
786 		if (synaptics_has_agm(priv) && hw->w == 2) {
787 			synaptics_parse_agm(buf, priv, hw);
788 			return 1;
789 		}
790 
791 		hw->x = (((buf[3] & 0x10) << 8) |
792 			 ((buf[1] & 0x0f) << 8) |
793 			 buf[4]);
794 		hw->y = (((buf[3] & 0x20) << 7) |
795 			 ((buf[1] & 0xf0) << 4) |
796 			 buf[5]);
797 		hw->z = buf[2];
798 
799 		hw->left  = (buf[0] & 0x01) ? 1 : 0;
800 		hw->right = (buf[0] & 0x02) ? 1 : 0;
801 
802 		if (priv->is_forcepad) {
803 			/*
804 			 * ForcePads, like Clickpads, use middle button
805 			 * bits to report primary button clicks.
806 			 * Unfortunately they report primary button not
807 			 * only when user presses on the pad above certain
808 			 * threshold, but also when there are more than one
809 			 * finger on the touchpad, which interferes with
810 			 * out multi-finger gestures.
811 			 */
812 			if (hw->z == 0) {
813 				/* No contacts */
814 				priv->press = priv->report_press = false;
815 			} else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
816 				/*
817 				 * Single-finger touch with pressure above
818 				 * the threshold. If pressure stays long
819 				 * enough, we'll start reporting primary
820 				 * button. We rely on the device continuing
821 				 * sending data even if finger does not
822 				 * move.
823 				 */
824 				if  (!priv->press) {
825 					priv->press_start = jiffies;
826 					priv->press = true;
827 				} else if (time_after(jiffies,
828 						priv->press_start +
829 							msecs_to_jiffies(50))) {
830 					priv->report_press = true;
831 				}
832 			} else {
833 				priv->press = false;
834 			}
835 
836 			hw->left = priv->report_press;
837 
838 		} else if (SYN_CAP_CLICKPAD(priv->info.ext_cap_0c)) {
839 			/*
840 			 * Clickpad's button is transmitted as middle button,
841 			 * however, since it is primary button, we will report
842 			 * it as BTN_LEFT.
843 			 */
844 			hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
845 
846 		} else if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities)) {
847 			hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
848 			if (hw->w == 2)
849 				hw->scroll = (s8)buf[1];
850 		}
851 
852 		if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
853 			hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
854 			hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
855 		}
856 
857 		if (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) > 0 &&
858 		    ((buf[0] ^ buf[3]) & 0x02)) {
859 			synaptics_parse_ext_buttons(buf, priv, hw);
860 		}
861 	} else {
862 		hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
863 		hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
864 
865 		hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
866 		hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
867 
868 		hw->left  = (buf[0] & 0x01) ? 1 : 0;
869 		hw->right = (buf[0] & 0x02) ? 1 : 0;
870 	}
871 
872 	/*
873 	 * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
874 	 * is used by some firmware to indicate a finger at the edge of
875 	 * the touchpad whose precise position cannot be determined, so
876 	 * convert these values to the maximum axis value.
877 	 */
878 	if (hw->x > X_MAX_POSITIVE)
879 		hw->x -= 1 << ABS_POS_BITS;
880 	else if (hw->x == X_MAX_POSITIVE)
881 		hw->x = XMAX;
882 
883 	if (hw->y > Y_MAX_POSITIVE)
884 		hw->y -= 1 << ABS_POS_BITS;
885 	else if (hw->y == Y_MAX_POSITIVE)
886 		hw->y = YMAX;
887 
888 	return 0;
889 }
890 
891 static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
892 					  bool active, int x, int y)
893 {
894 	input_mt_slot(dev, slot);
895 	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
896 	if (active) {
897 		input_report_abs(dev, ABS_MT_POSITION_X, x);
898 		input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
899 	}
900 }
901 
902 static void synaptics_report_semi_mt_data(struct input_dev *dev,
903 					  const struct synaptics_hw_state *a,
904 					  const struct synaptics_hw_state *b,
905 					  int num_fingers)
906 {
907 	if (num_fingers >= 2) {
908 		synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
909 					      min(a->y, b->y));
910 		synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
911 					      max(a->y, b->y));
912 	} else if (num_fingers == 1) {
913 		synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
914 		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
915 	} else {
916 		synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
917 		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
918 	}
919 }
920 
921 static void synaptics_report_ext_buttons(struct psmouse *psmouse,
922 					 const struct synaptics_hw_state *hw)
923 {
924 	struct input_dev *dev = psmouse->dev;
925 	struct synaptics_data *priv = psmouse->private;
926 	int ext_bits = (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
927 	int i;
928 
929 	if (!SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap))
930 		return;
931 
932 	/* Bug in FW 8.1 & 8.2, buttons are reported only when ExtBit is 1 */
933 	if ((SYN_ID_FULL(priv->info.identity) == 0x801 ||
934 	     SYN_ID_FULL(priv->info.identity) == 0x802) &&
935 	    !((psmouse->packet[0] ^ psmouse->packet[3]) & 0x02))
936 		return;
937 
938 	if (!SYN_CAP_EXT_BUTTONS_STICK(priv->info.ext_cap_10)) {
939 		for (i = 0; i < ext_bits; i++) {
940 			input_report_key(dev, BTN_0 + 2 * i,
941 				hw->ext_buttons & BIT(i));
942 			input_report_key(dev, BTN_1 + 2 * i,
943 				hw->ext_buttons & BIT(i + ext_bits));
944 		}
945 		return;
946 	}
947 
948 	/*
949 	 * This generation of touchpads has the trackstick buttons
950 	 * physically wired to the touchpad. Re-route them through
951 	 * the pass-through interface.
952 	 */
953 	if (priv->pt_port) {
954 		u8 pt_buttons;
955 
956 		/* The trackstick expects at most 3 buttons */
957 		pt_buttons = SYN_EXT_BUTTON_STICK_L(hw->ext_buttons)      |
958 			     SYN_EXT_BUTTON_STICK_R(hw->ext_buttons) << 1 |
959 			     SYN_EXT_BUTTON_STICK_M(hw->ext_buttons) << 2;
960 
961 		serio_interrupt(priv->pt_port,
962 				PSMOUSE_OOB_EXTRA_BTNS, SERIO_OOB_DATA);
963 		serio_interrupt(priv->pt_port, pt_buttons, SERIO_OOB_DATA);
964 	}
965 }
966 
967 static void synaptics_report_buttons(struct psmouse *psmouse,
968 				     const struct synaptics_hw_state *hw)
969 {
970 	struct input_dev *dev = psmouse->dev;
971 	struct synaptics_data *priv = psmouse->private;
972 
973 	input_report_key(dev, BTN_LEFT, hw->left);
974 	input_report_key(dev, BTN_RIGHT, hw->right);
975 
976 	if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities))
977 		input_report_key(dev, BTN_MIDDLE, hw->middle);
978 
979 	if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
980 		input_report_key(dev, BTN_FORWARD, hw->up);
981 		input_report_key(dev, BTN_BACK, hw->down);
982 	}
983 
984 	synaptics_report_ext_buttons(psmouse, hw);
985 }
986 
987 static void synaptics_report_mt_data(struct psmouse *psmouse,
988 				     const struct synaptics_hw_state *sgm,
989 				     int num_fingers)
990 {
991 	struct input_dev *dev = psmouse->dev;
992 	struct synaptics_data *priv = psmouse->private;
993 	const struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
994 	struct input_mt_pos pos[2];
995 	int slot[2], nsemi, i;
996 
997 	nsemi = clamp_val(num_fingers, 0, 2);
998 
999 	for (i = 0; i < nsemi; i++) {
1000 		pos[i].x = hw[i]->x;
1001 		pos[i].y = synaptics_invert_y(hw[i]->y);
1002 	}
1003 
1004 	input_mt_assign_slots(dev, slot, pos, nsemi, DMAX * priv->info.x_res);
1005 
1006 	for (i = 0; i < nsemi; i++) {
1007 		input_mt_slot(dev, slot[i]);
1008 		input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
1009 		input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
1010 		input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
1011 		input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
1012 	}
1013 
1014 	input_mt_drop_unused(dev);
1015 
1016 	/* Don't use active slot count to generate BTN_TOOL events. */
1017 	input_mt_report_pointer_emulation(dev, false);
1018 
1019 	/* Send the number of fingers reported by touchpad itself. */
1020 	input_mt_report_finger_count(dev, num_fingers);
1021 
1022 	synaptics_report_buttons(psmouse, sgm);
1023 
1024 	input_sync(dev);
1025 }
1026 
1027 static void synaptics_image_sensor_process(struct psmouse *psmouse,
1028 					   struct synaptics_hw_state *sgm)
1029 {
1030 	struct synaptics_data *priv = psmouse->private;
1031 	int num_fingers;
1032 
1033 	/*
1034 	 * Update mt_state using the new finger count and current mt_state.
1035 	 */
1036 	if (sgm->z == 0)
1037 		num_fingers = 0;
1038 	else if (sgm->w >= 4)
1039 		num_fingers = 1;
1040 	else if (sgm->w == 0)
1041 		num_fingers = 2;
1042 	else if (sgm->w == 1)
1043 		num_fingers = priv->agm_count ? priv->agm_count : 3;
1044 	else
1045 		num_fingers = 4;
1046 
1047 	/* Send resulting input events to user space */
1048 	synaptics_report_mt_data(psmouse, sgm, num_fingers);
1049 }
1050 
1051 static bool synaptics_has_multifinger(struct synaptics_data *priv)
1052 {
1053 	if (SYN_CAP_MULTIFINGER(priv->info.capabilities))
1054 		return true;
1055 
1056 	/* Advanced gesture mode also sends multi finger data */
1057 	return synaptics_has_agm(priv);
1058 }
1059 
1060 /*
1061  *  called for each full received packet from the touchpad
1062  */
1063 static void synaptics_process_packet(struct psmouse *psmouse)
1064 {
1065 	struct input_dev *dev = psmouse->dev;
1066 	struct synaptics_data *priv = psmouse->private;
1067 	struct synaptics_device_info *info = &priv->info;
1068 	struct synaptics_hw_state hw;
1069 	int num_fingers;
1070 	int finger_width;
1071 
1072 	if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
1073 		return;
1074 
1075 	if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1076 		synaptics_image_sensor_process(psmouse, &hw);
1077 		return;
1078 	}
1079 
1080 	if (hw.scroll) {
1081 		priv->scroll += hw.scroll;
1082 
1083 		while (priv->scroll >= 4) {
1084 			input_report_key(dev, BTN_BACK, !hw.down);
1085 			input_sync(dev);
1086 			input_report_key(dev, BTN_BACK, hw.down);
1087 			input_sync(dev);
1088 			priv->scroll -= 4;
1089 		}
1090 		while (priv->scroll <= -4) {
1091 			input_report_key(dev, BTN_FORWARD, !hw.up);
1092 			input_sync(dev);
1093 			input_report_key(dev, BTN_FORWARD, hw.up);
1094 			input_sync(dev);
1095 			priv->scroll += 4;
1096 		}
1097 		return;
1098 	}
1099 
1100 	if (hw.z > 0 && hw.x > 1) {
1101 		num_fingers = 1;
1102 		finger_width = 5;
1103 		if (SYN_CAP_EXTENDED(info->capabilities)) {
1104 			switch (hw.w) {
1105 			case 0 ... 1:
1106 				if (synaptics_has_multifinger(priv))
1107 					num_fingers = hw.w + 2;
1108 				break;
1109 			case 2:
1110 				/*
1111 				 * SYN_MODEL_PEN(info->model_id): even if
1112 				 * the device supports pen, we treat it as
1113 				 * a single finger.
1114 				 */
1115 				break;
1116 			case 4 ... 15:
1117 				if (SYN_CAP_PALMDETECT(info->capabilities))
1118 					finger_width = hw.w;
1119 				break;
1120 			}
1121 		}
1122 	} else {
1123 		num_fingers = 0;
1124 		finger_width = 0;
1125 	}
1126 
1127 	if (cr48_profile_sensor) {
1128 		synaptics_report_mt_data(psmouse, &hw, num_fingers);
1129 		return;
1130 	}
1131 
1132 	if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c))
1133 		synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
1134 					      num_fingers);
1135 
1136 	/* Post events
1137 	 * BTN_TOUCH has to be first as mousedev relies on it when doing
1138 	 * absolute -> relative conversion
1139 	 */
1140 	if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
1141 	if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
1142 
1143 	if (num_fingers > 0) {
1144 		input_report_abs(dev, ABS_X, hw.x);
1145 		input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
1146 	}
1147 	input_report_abs(dev, ABS_PRESSURE, hw.z);
1148 
1149 	if (SYN_CAP_PALMDETECT(info->capabilities))
1150 		input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
1151 
1152 	input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
1153 	if (synaptics_has_multifinger(priv)) {
1154 		input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
1155 		input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
1156 	}
1157 
1158 	synaptics_report_buttons(psmouse, &hw);
1159 
1160 	input_sync(dev);
1161 }
1162 
1163 static bool synaptics_validate_byte(struct psmouse *psmouse,
1164 				    int idx, enum synaptics_pkt_type pkt_type)
1165 {
1166 	static const u8 newabs_mask[]	  = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
1167 	static const u8 newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
1168 	static const u8 newabs_rslt[]	  = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
1169 	static const u8 oldabs_mask[]	  = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
1170 	static const u8 oldabs_rslt[]	  = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
1171 	const u8 *packet = psmouse->packet;
1172 
1173 	if (idx < 0 || idx > 4)
1174 		return false;
1175 
1176 	switch (pkt_type) {
1177 
1178 	case SYN_NEWABS:
1179 	case SYN_NEWABS_RELAXED:
1180 		return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
1181 
1182 	case SYN_NEWABS_STRICT:
1183 		return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
1184 
1185 	case SYN_OLDABS:
1186 		return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
1187 
1188 	default:
1189 		psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
1190 		return false;
1191 	}
1192 }
1193 
1194 static enum synaptics_pkt_type
1195 synaptics_detect_pkt_type(struct psmouse *psmouse)
1196 {
1197 	int i;
1198 
1199 	for (i = 0; i < 5; i++) {
1200 		if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
1201 			psmouse_info(psmouse, "using relaxed packet validation\n");
1202 			return SYN_NEWABS_RELAXED;
1203 		}
1204 	}
1205 
1206 	return SYN_NEWABS_STRICT;
1207 }
1208 
1209 static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
1210 {
1211 	struct synaptics_data *priv = psmouse->private;
1212 
1213 	if (psmouse->pktcnt >= 6) { /* Full packet received */
1214 		if (unlikely(priv->pkt_type == SYN_NEWABS))
1215 			priv->pkt_type = synaptics_detect_pkt_type(psmouse);
1216 
1217 		if (SYN_CAP_PASS_THROUGH(priv->info.capabilities) &&
1218 		    synaptics_is_pt_packet(psmouse->packet)) {
1219 			if (priv->pt_port)
1220 				synaptics_pass_pt_packet(priv->pt_port,
1221 							 psmouse->packet);
1222 		} else
1223 			synaptics_process_packet(psmouse);
1224 
1225 		return PSMOUSE_FULL_PACKET;
1226 	}
1227 
1228 	return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
1229 		PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
1230 }
1231 
1232 /*****************************************************************************
1233  *	Driver initialization/cleanup functions
1234  ****************************************************************************/
1235 static void set_abs_position_params(struct input_dev *dev,
1236 				    struct synaptics_device_info *info,
1237 				    int x_code, int y_code)
1238 {
1239 	int x_min = info->x_min ?: XMIN_NOMINAL;
1240 	int x_max = info->x_max ?: XMAX_NOMINAL;
1241 	int y_min = info->y_min ?: YMIN_NOMINAL;
1242 	int y_max = info->y_max ?: YMAX_NOMINAL;
1243 	int fuzz = SYN_CAP_REDUCED_FILTERING(info->ext_cap_0c) ?
1244 			SYN_REDUCED_FILTER_FUZZ : 0;
1245 
1246 	input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
1247 	input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
1248 	input_abs_set_res(dev, x_code, info->x_res);
1249 	input_abs_set_res(dev, y_code, info->y_res);
1250 }
1251 
1252 static int set_input_params(struct psmouse *psmouse,
1253 			    struct synaptics_data *priv)
1254 {
1255 	struct input_dev *dev = psmouse->dev;
1256 	struct synaptics_device_info *info = &priv->info;
1257 	int i;
1258 	int error;
1259 
1260 	/* Reset default psmouse capabilities */
1261 	__clear_bit(EV_REL, dev->evbit);
1262 	bitmap_zero(dev->relbit, REL_CNT);
1263 	bitmap_zero(dev->keybit, KEY_CNT);
1264 
1265 	/* Things that apply to both modes */
1266 	__set_bit(INPUT_PROP_POINTER, dev->propbit);
1267 
1268 	input_set_capability(dev, EV_KEY, BTN_LEFT);
1269 
1270 	/* Clickpads report only left button */
1271 	if (!SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1272 		input_set_capability(dev, EV_KEY, BTN_RIGHT);
1273 		if (SYN_CAP_MIDDLE_BUTTON(info->capabilities))
1274 			input_set_capability(dev, EV_KEY, BTN_MIDDLE);
1275 	}
1276 
1277 	if (!priv->absolute_mode) {
1278 		/* Relative mode */
1279 		input_set_capability(dev, EV_REL, REL_X);
1280 		input_set_capability(dev, EV_REL, REL_Y);
1281 		return 0;
1282 	}
1283 
1284 	/* Absolute mode */
1285 	set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1286 	input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
1287 
1288 	if (cr48_profile_sensor)
1289 		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1290 
1291 	if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1292 		set_abs_position_params(dev, info,
1293 					ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1294 		/* Image sensors can report per-contact pressure */
1295 		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1296 
1297 		error = input_mt_init_slots(dev, 2,
1298 					    INPUT_MT_POINTER | INPUT_MT_TRACK);
1299 		if (error)
1300 			return error;
1301 
1302 		/* Image sensors can signal 4 and 5 finger clicks */
1303 		input_set_capability(dev, EV_KEY, BTN_TOOL_QUADTAP);
1304 		input_set_capability(dev, EV_KEY, BTN_TOOL_QUINTTAP);
1305 	} else if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c)) {
1306 		set_abs_position_params(dev, info,
1307 					ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1308 		/*
1309 		 * Profile sensor in CR-48 tracks contacts reasonably well,
1310 		 * other non-image sensors with AGM use semi-mt.
1311 		 */
1312 		error = input_mt_init_slots(dev, 2,
1313 					    INPUT_MT_POINTER |
1314 					     (cr48_profile_sensor ?
1315 					      INPUT_MT_TRACK :
1316 					      INPUT_MT_SEMI_MT));
1317 		if (error)
1318 			return error;
1319 
1320 		/*
1321 		 * For semi-mt devices we send ABS_X/Y ourselves instead of
1322 		 * input_mt_report_pointer_emulation. But
1323 		 * input_mt_init_slots() resets the fuzz to 0, leading to a
1324 		 * filtered ABS_MT_POSITION_X but an unfiltered ABS_X
1325 		 * position. Let's re-initialize ABS_X/Y here.
1326 		 */
1327 		if (!cr48_profile_sensor)
1328 			set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1329 	}
1330 
1331 	if (SYN_CAP_PALMDETECT(info->capabilities))
1332 		input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
1333 
1334 	input_set_capability(dev, EV_KEY, BTN_TOUCH);
1335 	input_set_capability(dev, EV_KEY, BTN_TOOL_FINGER);
1336 
1337 	if (synaptics_has_multifinger(priv)) {
1338 		input_set_capability(dev, EV_KEY, BTN_TOOL_DOUBLETAP);
1339 		input_set_capability(dev, EV_KEY, BTN_TOOL_TRIPLETAP);
1340 	}
1341 
1342 	if (SYN_CAP_FOUR_BUTTON(info->capabilities) ||
1343 	    SYN_CAP_MIDDLE_BUTTON(info->capabilities)) {
1344 		input_set_capability(dev, EV_KEY, BTN_FORWARD);
1345 		input_set_capability(dev, EV_KEY, BTN_BACK);
1346 	}
1347 
1348 	if (!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1349 		for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(info->ext_cap); i++)
1350 			input_set_capability(dev, EV_KEY, BTN_0 + i);
1351 
1352 	if (SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1353 		__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1354 		if (psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1355 		    !SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1356 			__set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
1357 	}
1358 
1359 	return 0;
1360 }
1361 
1362 static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
1363 					      void *data, char *buf)
1364 {
1365 	struct synaptics_data *priv = psmouse->private;
1366 
1367 	return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
1368 }
1369 
1370 static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
1371 					     void *data, const char *buf,
1372 					     size_t len)
1373 {
1374 	struct synaptics_data *priv = psmouse->private;
1375 	unsigned int value;
1376 	int err;
1377 
1378 	err = kstrtouint(buf, 10, &value);
1379 	if (err)
1380 		return err;
1381 
1382 	if (value > 1)
1383 		return -EINVAL;
1384 
1385 	if (value == priv->disable_gesture)
1386 		return len;
1387 
1388 	priv->disable_gesture = value;
1389 	if (value)
1390 		priv->mode |= SYN_BIT_DISABLE_GESTURE;
1391 	else
1392 		priv->mode &= ~SYN_BIT_DISABLE_GESTURE;
1393 
1394 	if (synaptics_mode_cmd(psmouse, priv->mode))
1395 		return -EIO;
1396 
1397 	return len;
1398 }
1399 
1400 PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
1401 		    synaptics_show_disable_gesture,
1402 		    synaptics_set_disable_gesture);
1403 
1404 static void synaptics_disconnect(struct psmouse *psmouse)
1405 {
1406 	struct synaptics_data *priv = psmouse->private;
1407 
1408 	/*
1409 	 * We might have left a breadcrumb when trying to
1410 	 * set up SMbus companion.
1411 	 */
1412 	psmouse_smbus_cleanup(psmouse);
1413 
1414 	if (!priv->absolute_mode &&
1415 			SYN_ID_DISGEST_SUPPORTED(priv->info.identity))
1416 		device_remove_file(&psmouse->ps2dev.serio->dev,
1417 				   &psmouse_attr_disable_gesture.dattr);
1418 
1419 	synaptics_reset(psmouse);
1420 	kfree(priv);
1421 	psmouse->private = NULL;
1422 }
1423 
1424 static int synaptics_reconnect(struct psmouse *psmouse)
1425 {
1426 	struct synaptics_data *priv = psmouse->private;
1427 	struct synaptics_device_info info;
1428 	u8 param[2];
1429 	int retry = 0;
1430 	int error;
1431 
1432 	do {
1433 		psmouse_reset(psmouse);
1434 		if (retry) {
1435 			/*
1436 			 * On some boxes, right after resuming, the touchpad
1437 			 * needs some time to finish initializing (I assume
1438 			 * it needs time to calibrate) and start responding
1439 			 * to Synaptics-specific queries, so let's wait a
1440 			 * bit.
1441 			 */
1442 			ssleep(1);
1443 		}
1444 		ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
1445 		error = synaptics_detect(psmouse, 0);
1446 	} while (error && ++retry < 3);
1447 
1448 	if (error)
1449 		return error;
1450 
1451 	if (retry > 1)
1452 		psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
1453 
1454 	error = synaptics_query_hardware(psmouse, &info);
1455 	if (error) {
1456 		psmouse_err(psmouse, "Unable to query device.\n");
1457 		return error;
1458 	}
1459 
1460 	error = synaptics_set_mode(psmouse);
1461 	if (error) {
1462 		psmouse_err(psmouse, "Unable to initialize device.\n");
1463 		return error;
1464 	}
1465 
1466 	if (info.identity != priv->info.identity ||
1467 	    info.model_id != priv->info.model_id ||
1468 	    info.capabilities != priv->info.capabilities ||
1469 	    info.ext_cap != priv->info.ext_cap) {
1470 		psmouse_err(psmouse,
1471 			    "hardware appears to be different: id(%u-%u), model(%u-%u), caps(%x-%x), ext(%x-%x).\n",
1472 			    priv->info.identity, info.identity,
1473 			    priv->info.model_id, info.model_id,
1474 			    priv->info.capabilities, info.capabilities,
1475 			    priv->info.ext_cap, info.ext_cap);
1476 		return -ENXIO;
1477 	}
1478 
1479 	return 0;
1480 }
1481 
1482 static bool impaired_toshiba_kbc;
1483 
1484 static const struct dmi_system_id toshiba_dmi_table[] __initconst = {
1485 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1486 	{
1487 		/* Toshiba Satellite */
1488 		.matches = {
1489 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1490 			DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
1491 		},
1492 	},
1493 	{
1494 		/* Toshiba Dynabook */
1495 		.matches = {
1496 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1497 			DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
1498 		},
1499 	},
1500 	{
1501 		/* Toshiba Portege M300 */
1502 		.matches = {
1503 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1504 			DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
1505 		},
1506 
1507 	},
1508 	{
1509 		/* Toshiba Portege M300 */
1510 		.matches = {
1511 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1512 			DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
1513 			DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
1514 		},
1515 
1516 	},
1517 #endif
1518 	{ }
1519 };
1520 
1521 static bool broken_olpc_ec;
1522 
1523 static const struct dmi_system_id olpc_dmi_table[] __initconst = {
1524 #if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
1525 	{
1526 		/* OLPC XO-1 or XO-1.5 */
1527 		.matches = {
1528 			DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
1529 			DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
1530 		},
1531 	},
1532 #endif
1533 	{ }
1534 };
1535 
1536 static const struct dmi_system_id __initconst cr48_dmi_table[] = {
1537 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1538 	{
1539 		/* Cr-48 Chromebook (Codename Mario) */
1540 		.matches = {
1541 			DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
1542 			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
1543 		},
1544 	},
1545 #endif
1546 	{ }
1547 };
1548 
1549 void __init synaptics_module_init(void)
1550 {
1551 	impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
1552 	broken_olpc_ec = dmi_check_system(olpc_dmi_table);
1553 	cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
1554 }
1555 
1556 static int synaptics_init_ps2(struct psmouse *psmouse,
1557 			      struct synaptics_device_info *info,
1558 			      bool absolute_mode)
1559 {
1560 	struct synaptics_data *priv;
1561 	int err;
1562 
1563 	synaptics_apply_quirks(psmouse, info);
1564 
1565 	psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
1566 	if (!priv)
1567 		return -ENOMEM;
1568 
1569 	priv->info = *info;
1570 	priv->absolute_mode = absolute_mode;
1571 	if (SYN_ID_DISGEST_SUPPORTED(info->identity))
1572 		priv->disable_gesture = true;
1573 
1574 	/*
1575 	 * Unfortunately ForcePad capability is not exported over PS/2,
1576 	 * so we have to resort to checking PNP IDs.
1577 	 */
1578 	priv->is_forcepad = psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids);
1579 
1580 	err = synaptics_set_mode(psmouse);
1581 	if (err) {
1582 		psmouse_err(psmouse, "Unable to initialize device.\n");
1583 		goto init_fail;
1584 	}
1585 
1586 	priv->pkt_type = SYN_MODEL_NEWABS(info->model_id) ?
1587 					SYN_NEWABS : SYN_OLDABS;
1588 
1589 	psmouse_info(psmouse,
1590 		     "Touchpad model: %lu, fw: %lu.%lu, id: %#x, caps: %#x/%#x/%#x/%#x, board id: %u, fw id: %u\n",
1591 		     SYN_ID_MODEL(info->identity),
1592 		     SYN_ID_MAJOR(info->identity), SYN_ID_MINOR(info->identity),
1593 		     info->model_id,
1594 		     info->capabilities, info->ext_cap, info->ext_cap_0c,
1595 		     info->ext_cap_10, info->board_id, info->firmware_id);
1596 
1597 	err = set_input_params(psmouse, priv);
1598 	if (err) {
1599 		psmouse_err(psmouse,
1600 			    "failed to set up capabilities: %d\n", err);
1601 		goto init_fail;
1602 	}
1603 
1604 	/*
1605 	 * Encode touchpad model so that it can be used to set
1606 	 * input device->id.version and be visible to userspace.
1607 	 * Because version is __u16 we have to drop something.
1608 	 * Hardware info bits seem to be good candidates as they
1609 	 * are documented to be for Synaptics corp. internal use.
1610 	 */
1611 	psmouse->model = ((info->model_id & 0x00ff0000) >> 8) |
1612 			  (info->model_id & 0x000000ff);
1613 
1614 	if (absolute_mode) {
1615 		psmouse->protocol_handler = synaptics_process_byte;
1616 		psmouse->pktsize = 6;
1617 	} else {
1618 		/* Relative mode follows standard PS/2 mouse protocol */
1619 		psmouse->protocol_handler = psmouse_process_byte;
1620 		psmouse->pktsize = 3;
1621 	}
1622 
1623 	psmouse->set_rate = synaptics_set_rate;
1624 	psmouse->disconnect = synaptics_disconnect;
1625 	psmouse->reconnect = synaptics_reconnect;
1626 	psmouse->fast_reconnect = NULL;
1627 	psmouse->cleanup = synaptics_reset;
1628 	/* Synaptics can usually stay in sync without extra help */
1629 	psmouse->resync_time = 0;
1630 
1631 	if (SYN_CAP_PASS_THROUGH(info->capabilities))
1632 		synaptics_pt_create(psmouse);
1633 
1634 	/*
1635 	 * Toshiba's KBC seems to have trouble handling data from
1636 	 * Synaptics at full rate.  Switch to a lower rate (roughly
1637 	 * the same rate as a standard PS/2 mouse).
1638 	 */
1639 	if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
1640 		psmouse_info(psmouse,
1641 			     "Toshiba %s detected, limiting rate to 40pps.\n",
1642 			     dmi_get_system_info(DMI_PRODUCT_NAME));
1643 		psmouse->rate = 40;
1644 	}
1645 
1646 	if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(info->identity)) {
1647 		err = device_create_file(&psmouse->ps2dev.serio->dev,
1648 					 &psmouse_attr_disable_gesture.dattr);
1649 		if (err) {
1650 			psmouse_err(psmouse,
1651 				    "Failed to create disable_gesture attribute (%d)",
1652 				    err);
1653 			goto init_fail;
1654 		}
1655 	}
1656 
1657 	return 0;
1658 
1659  init_fail:
1660 	kfree(priv);
1661 	return err;
1662 }
1663 
1664 static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
1665 {
1666 	struct synaptics_device_info info;
1667 	int error;
1668 
1669 	psmouse_reset(psmouse);
1670 
1671 	error = synaptics_query_hardware(psmouse, &info);
1672 	if (error) {
1673 		psmouse_err(psmouse, "Unable to query device: %d\n", error);
1674 		return error;
1675 	}
1676 
1677 	return synaptics_init_ps2(psmouse, &info, absolute_mode);
1678 }
1679 
1680 int synaptics_init_absolute(struct psmouse *psmouse)
1681 {
1682 	return __synaptics_init(psmouse, true);
1683 }
1684 
1685 int synaptics_init_relative(struct psmouse *psmouse)
1686 {
1687 	return __synaptics_init(psmouse, false);
1688 }
1689 
1690 static int synaptics_setup_ps2(struct psmouse *psmouse,
1691 			       struct synaptics_device_info *info)
1692 {
1693 	bool absolute_mode = true;
1694 	int error;
1695 
1696 	/*
1697 	 * The OLPC XO has issues with Synaptics' absolute mode; the constant
1698 	 * packet spew overloads the EC such that key presses on the keyboard
1699 	 * are missed.  Given that, don't even attempt to use Absolute mode.
1700 	 * Relative mode seems to work just fine.
1701 	 */
1702 	if (broken_olpc_ec) {
1703 		psmouse_info(psmouse,
1704 			     "OLPC XO detected, forcing relative protocol.\n");
1705 		absolute_mode = false;
1706 	}
1707 
1708 	error = synaptics_init_ps2(psmouse, info, absolute_mode);
1709 	if (error)
1710 		return error;
1711 
1712 	return absolute_mode ? PSMOUSE_SYNAPTICS : PSMOUSE_SYNAPTICS_RELATIVE;
1713 }
1714 
1715 #else /* CONFIG_MOUSE_PS2_SYNAPTICS */
1716 
1717 void __init synaptics_module_init(void)
1718 {
1719 }
1720 
1721 static int __maybe_unused
1722 synaptics_setup_ps2(struct psmouse *psmouse,
1723 		    struct synaptics_device_info *info)
1724 {
1725 	return -ENOSYS;
1726 }
1727 
1728 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS */
1729 
1730 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
1731 
1732 /*
1733  * The newest Synaptics device can use a secondary bus (called InterTouch) which
1734  * provides a better bandwidth and allow a better control of the touchpads.
1735  * This is used to decide if we need to use this bus or not.
1736  */
1737 enum {
1738 	SYNAPTICS_INTERTOUCH_NOT_SET = -1,
1739 	SYNAPTICS_INTERTOUCH_OFF,
1740 	SYNAPTICS_INTERTOUCH_ON,
1741 };
1742 
1743 static int synaptics_intertouch = IS_ENABLED(CONFIG_RMI4_SMB) ?
1744 		SYNAPTICS_INTERTOUCH_NOT_SET : SYNAPTICS_INTERTOUCH_OFF;
1745 module_param_named(synaptics_intertouch, synaptics_intertouch, int, 0644);
1746 MODULE_PARM_DESC(synaptics_intertouch, "Use a secondary bus for the Synaptics device.");
1747 
1748 static int synaptics_create_intertouch(struct psmouse *psmouse,
1749 				       struct synaptics_device_info *info,
1750 				       bool leave_breadcrumbs)
1751 {
1752 	bool topbuttonpad =
1753 		psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1754 		!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10);
1755 	const struct rmi_device_platform_data pdata = {
1756 		.reset_delay_ms = 30,
1757 		.sensor_pdata = {
1758 			.sensor_type = rmi_sensor_touchpad,
1759 			.axis_align.flip_y = true,
1760 			.kernel_tracking = false,
1761 			.topbuttonpad = topbuttonpad,
1762 		},
1763 		.gpio_data = {
1764 			.buttonpad = SYN_CAP_CLICKPAD(info->ext_cap_0c),
1765 			.trackstick_buttons =
1766 				!!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10),
1767 		},
1768 	};
1769 	const struct i2c_board_info intertouch_board = {
1770 		I2C_BOARD_INFO("rmi4_smbus", 0x2c),
1771 		.flags = I2C_CLIENT_HOST_NOTIFY,
1772 	};
1773 
1774 	return psmouse_smbus_init(psmouse, &intertouch_board,
1775 				  &pdata, sizeof(pdata), true,
1776 				  leave_breadcrumbs);
1777 }
1778 
1779 /*
1780  * synaptics_setup_intertouch - called once the PS/2 devices are enumerated
1781  * and decides to instantiate a SMBus InterTouch device.
1782  */
1783 static int synaptics_setup_intertouch(struct psmouse *psmouse,
1784 				      struct synaptics_device_info *info,
1785 				      bool leave_breadcrumbs)
1786 {
1787 	int error;
1788 
1789 	if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_OFF)
1790 		return -ENXIO;
1791 
1792 	if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_NOT_SET) {
1793 		if (!psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1794 		    !psmouse_matches_pnp_id(psmouse, smbus_pnp_ids)) {
1795 
1796 			if (!psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids))
1797 				psmouse_info(psmouse,
1798 					     "Your touchpad (%s) says it can support a different bus. "
1799 					     "If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@vger.kernel.org.\n",
1800 					     psmouse->ps2dev.serio->firmware_id);
1801 
1802 			return -ENXIO;
1803 		}
1804 	}
1805 
1806 	psmouse_info(psmouse, "Trying to set up SMBus access\n");
1807 
1808 	error = synaptics_create_intertouch(psmouse, info, leave_breadcrumbs);
1809 	if (error) {
1810 		if (error == -EAGAIN)
1811 			psmouse_info(psmouse, "SMbus companion is not ready yet\n");
1812 		else
1813 			psmouse_err(psmouse, "unable to create intertouch device\n");
1814 
1815 		return error;
1816 	}
1817 
1818 	return 0;
1819 }
1820 
1821 int synaptics_init_smbus(struct psmouse *psmouse)
1822 {
1823 	struct synaptics_device_info info;
1824 	int error;
1825 
1826 	psmouse_reset(psmouse);
1827 
1828 	error = synaptics_query_hardware(psmouse, &info);
1829 	if (error) {
1830 		psmouse_err(psmouse, "Unable to query device: %d\n", error);
1831 		return error;
1832 	}
1833 
1834 	if (!SYN_CAP_INTERTOUCH(info.ext_cap_0c))
1835 		return -ENXIO;
1836 
1837 	return synaptics_create_intertouch(psmouse, &info, false);
1838 }
1839 
1840 #else /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1841 
1842 static int __maybe_unused
1843 synaptics_setup_intertouch(struct psmouse *psmouse,
1844 			   struct synaptics_device_info *info,
1845 			   bool leave_breadcrumbs)
1846 {
1847 	return -ENOSYS;
1848 }
1849 
1850 int synaptics_init_smbus(struct psmouse *psmouse)
1851 {
1852 	return -ENOSYS;
1853 }
1854 
1855 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1856 
1857 #if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
1858     defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
1859 
1860 int synaptics_init(struct psmouse *psmouse)
1861 {
1862 	struct synaptics_device_info info;
1863 	int error;
1864 	int retval;
1865 
1866 	psmouse_reset(psmouse);
1867 
1868 	error = synaptics_query_hardware(psmouse, &info);
1869 	if (error) {
1870 		psmouse_err(psmouse, "Unable to query device: %d\n", error);
1871 		return error;
1872 	}
1873 
1874 	if (SYN_CAP_INTERTOUCH(info.ext_cap_0c)) {
1875 		if ((!IS_ENABLED(CONFIG_RMI4_SMB) ||
1876 		     !IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) &&
1877 		    /* Forcepads need F21, which is not ready */
1878 		    !psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids)) {
1879 			psmouse_warn(psmouse,
1880 				     "The touchpad can support a better bus than the too old PS/2 protocol. "
1881 				     "Make sure MOUSE_PS2_SYNAPTICS_SMBUS and RMI4_SMB are enabled to get a better touchpad experience.\n");
1882 		}
1883 
1884 		error = synaptics_setup_intertouch(psmouse, &info, true);
1885 		if (!error)
1886 			return PSMOUSE_SYNAPTICS_SMBUS;
1887 	}
1888 
1889 	retval = synaptics_setup_ps2(psmouse, &info);
1890 	if (retval < 0) {
1891 		/*
1892 		 * Not using any flavor of Synaptics support, so clean up
1893 		 * SMbus breadcrumbs, if any.
1894 		 */
1895 		psmouse_smbus_cleanup(psmouse);
1896 	}
1897 
1898 	return retval;
1899 }
1900 
1901 #else /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1902 
1903 int synaptics_init(struct psmouse *psmouse)
1904 {
1905 	return -ENOSYS;
1906 }
1907 
1908 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1909