xref: /openbmc/linux/drivers/input/mouse/synaptics.c (revision f5ad1c74)
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 	"LEN200f", /* T450s */
186 	"LEN2044", /* L470  */
187 	"LEN2054", /* E480 */
188 	"LEN2055", /* E580 */
189 	"LEN2068", /* T14 Gen 1 */
190 	"SYN3052", /* HP EliteBook 840 G4 */
191 	"SYN3221", /* HP 15-ay000 */
192 	"SYN323d", /* HP Spectre X360 13-w013dx */
193 	"SYN3257", /* HP Envy 13-ad105ng */
194 	NULL
195 };
196 
197 static const char * const forcepad_pnp_ids[] = {
198 	"SYN300D",
199 	"SYN3014",
200 	NULL
201 };
202 
203 /*
204  * Send a command to the synaptics touchpad by special commands
205  */
206 static int synaptics_send_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
207 {
208 	int error;
209 
210 	error = ps2_sliced_command(&psmouse->ps2dev, cmd);
211 	if (error)
212 		return error;
213 
214 	error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO);
215 	if (error)
216 		return error;
217 
218 	return 0;
219 }
220 
221 static int synaptics_query_int(struct psmouse *psmouse, u8 query_cmd, u32 *val)
222 {
223 	int error;
224 	union {
225 		__be32 be_val;
226 		char buf[4];
227 	} resp = { 0 };
228 
229 	error = synaptics_send_cmd(psmouse, query_cmd, resp.buf + 1);
230 	if (error)
231 		return error;
232 
233 	*val = be32_to_cpu(resp.be_val);
234 	return 0;
235 }
236 
237 /*
238  * Identify Touchpad
239  * See also the SYN_ID_* macros
240  */
241 static int synaptics_identify(struct psmouse *psmouse,
242 			      struct synaptics_device_info *info)
243 {
244 	int error;
245 
246 	error = synaptics_query_int(psmouse, SYN_QUE_IDENTIFY, &info->identity);
247 	if (error)
248 		return error;
249 
250 	return SYN_ID_IS_SYNAPTICS(info->identity) ? 0 : -ENXIO;
251 }
252 
253 /*
254  * Read the model-id bytes from the touchpad
255  * see also SYN_MODEL_* macros
256  */
257 static int synaptics_model_id(struct psmouse *psmouse,
258 			      struct synaptics_device_info *info)
259 {
260 	return synaptics_query_int(psmouse, SYN_QUE_MODEL, &info->model_id);
261 }
262 
263 /*
264  * Read the firmware id from the touchpad
265  */
266 static int synaptics_firmware_id(struct psmouse *psmouse,
267 				 struct synaptics_device_info *info)
268 {
269 	return synaptics_query_int(psmouse, SYN_QUE_FIRMWARE_ID,
270 				   &info->firmware_id);
271 }
272 
273 /*
274  * Read the board id and the "More Extended Queries" from the touchpad
275  * The board id is encoded in the "QUERY MODES" response
276  */
277 static int synaptics_query_modes(struct psmouse *psmouse,
278 				 struct synaptics_device_info *info)
279 {
280 	u8 bid[3];
281 	int error;
282 
283 	/* firmwares prior 7.5 have no board_id encoded */
284 	if (SYN_ID_FULL(info->identity) < 0x705)
285 		return 0;
286 
287 	error = synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid);
288 	if (error)
289 		return error;
290 
291 	info->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
292 
293 	if (SYN_MEXT_CAP_BIT(bid[0]))
294 		return synaptics_query_int(psmouse, SYN_QUE_MEXT_CAPAB_10,
295 					   &info->ext_cap_10);
296 
297 	return 0;
298 }
299 
300 /*
301  * Read the capability-bits from the touchpad
302  * see also the SYN_CAP_* macros
303  */
304 static int synaptics_capability(struct psmouse *psmouse,
305 				struct synaptics_device_info *info)
306 {
307 	int error;
308 
309 	error = synaptics_query_int(psmouse, SYN_QUE_CAPABILITIES,
310 				    &info->capabilities);
311 	if (error)
312 		return error;
313 
314 	info->ext_cap = info->ext_cap_0c = 0;
315 
316 	/*
317 	 * Older firmwares had submodel ID fixed to 0x47
318 	 */
319 	if (SYN_ID_FULL(info->identity) < 0x705 &&
320 	    SYN_CAP_SUBMODEL_ID(info->capabilities) != 0x47) {
321 		return -ENXIO;
322 	}
323 
324 	/*
325 	 * Unless capExtended is set the rest of the flags should be ignored
326 	 */
327 	if (!SYN_CAP_EXTENDED(info->capabilities))
328 		info->capabilities = 0;
329 
330 	if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 1) {
331 		error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB,
332 					    &info->ext_cap);
333 		if (error) {
334 			psmouse_warn(psmouse,
335 				     "device claims to have extended capabilities, but I'm not able to read them.\n");
336 		} else {
337 			/*
338 			 * if nExtBtn is greater than 8 it should be considered
339 			 * invalid and treated as 0
340 			 */
341 			if (SYN_CAP_MULTI_BUTTON_NO(info->ext_cap) > 8)
342 				info->ext_cap &= ~SYN_CAP_MB_MASK;
343 		}
344 	}
345 
346 	if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 4) {
347 		error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB_0C,
348 					    &info->ext_cap_0c);
349 		if (error)
350 			psmouse_warn(psmouse,
351 				     "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
352 	}
353 
354 	return 0;
355 }
356 
357 /*
358  * Read touchpad resolution and maximum reported coordinates
359  * Resolution is left zero if touchpad does not support the query
360  */
361 static int synaptics_resolution(struct psmouse *psmouse,
362 				struct synaptics_device_info *info)
363 {
364 	u8 resp[3];
365 	int error;
366 
367 	if (SYN_ID_MAJOR(info->identity) < 4)
368 		return 0;
369 
370 	error = synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp);
371 	if (!error) {
372 		if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
373 			info->x_res = resp[0]; /* x resolution in units/mm */
374 			info->y_res = resp[2]; /* y resolution in units/mm */
375 		}
376 	}
377 
378 	if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 5 &&
379 	    SYN_CAP_MAX_DIMENSIONS(info->ext_cap_0c)) {
380 		error = synaptics_send_cmd(psmouse,
381 					   SYN_QUE_EXT_MAX_COORDS, resp);
382 		if (error) {
383 			psmouse_warn(psmouse,
384 				     "device claims to have max coordinates query, but I'm not able to read it.\n");
385 		} else {
386 			info->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
387 			info->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
388 			psmouse_info(psmouse,
389 				     "queried max coordinates: x [..%d], y [..%d]\n",
390 				     info->x_max, info->y_max);
391 		}
392 	}
393 
394 	if (SYN_CAP_MIN_DIMENSIONS(info->ext_cap_0c) &&
395 	    (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 7 ||
396 	     /*
397 	      * Firmware v8.1 does not report proper number of extended
398 	      * capabilities, but has been proven to report correct min
399 	      * coordinates.
400 	      */
401 	     SYN_ID_FULL(info->identity) == 0x801)) {
402 		error = synaptics_send_cmd(psmouse,
403 					   SYN_QUE_EXT_MIN_COORDS, resp);
404 		if (error) {
405 			psmouse_warn(psmouse,
406 				     "device claims to have min coordinates query, but I'm not able to read it.\n");
407 		} else {
408 			info->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
409 			info->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
410 			psmouse_info(psmouse,
411 				     "queried min coordinates: x [%d..], y [%d..]\n",
412 				     info->x_min, info->y_min);
413 		}
414 	}
415 
416 	return 0;
417 }
418 
419 static int synaptics_query_hardware(struct psmouse *psmouse,
420 				    struct synaptics_device_info *info)
421 {
422 	int error;
423 
424 	memset(info, 0, sizeof(*info));
425 
426 	error = synaptics_identify(psmouse, info);
427 	if (error)
428 		return error;
429 
430 	error = synaptics_model_id(psmouse, info);
431 	if (error)
432 		return error;
433 
434 	error = synaptics_firmware_id(psmouse, info);
435 	if (error)
436 		return error;
437 
438 	error = synaptics_query_modes(psmouse, info);
439 	if (error)
440 		return error;
441 
442 	error = synaptics_capability(psmouse, info);
443 	if (error)
444 		return error;
445 
446 	error = synaptics_resolution(psmouse, info);
447 	if (error)
448 		return error;
449 
450 	return 0;
451 }
452 
453 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
454 
455 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
456 
457 static bool cr48_profile_sensor;
458 
459 #define ANY_BOARD_ID 0
460 struct min_max_quirk {
461 	const char * const *pnp_ids;
462 	struct {
463 		u32 min, max;
464 	} board_id;
465 	u32 x_min, x_max, y_min, y_max;
466 };
467 
468 static const struct min_max_quirk min_max_pnpid_table[] = {
469 	{
470 		(const char * const []){"LEN0033", NULL},
471 		{ANY_BOARD_ID, ANY_BOARD_ID},
472 		1024, 5052, 2258, 4832
473 	},
474 	{
475 		(const char * const []){"LEN0042", NULL},
476 		{ANY_BOARD_ID, ANY_BOARD_ID},
477 		1232, 5710, 1156, 4696
478 	},
479 	{
480 		(const char * const []){"LEN0034", "LEN0036", "LEN0037",
481 					"LEN0039", "LEN2002", "LEN2004",
482 					NULL},
483 		{ANY_BOARD_ID, 2961},
484 		1024, 5112, 2024, 4832
485 	},
486 	{
487 		(const char * const []){"LEN2000", NULL},
488 		{ANY_BOARD_ID, ANY_BOARD_ID},
489 		1024, 5113, 2021, 4832
490 	},
491 	{
492 		(const char * const []){"LEN2001", NULL},
493 		{ANY_BOARD_ID, ANY_BOARD_ID},
494 		1024, 5022, 2508, 4832
495 	},
496 	{
497 		(const char * const []){"LEN2006", NULL},
498 		{2691, 2691},
499 		1024, 5045, 2457, 4832
500 	},
501 	{
502 		(const char * const []){"LEN2006", NULL},
503 		{ANY_BOARD_ID, ANY_BOARD_ID},
504 		1264, 5675, 1171, 4688
505 	},
506 	{ }
507 };
508 
509 /*****************************************************************************
510  *	Synaptics communications functions
511  ****************************************************************************/
512 
513 /*
514  * Synaptics touchpads report the y coordinate from bottom to top, which is
515  * opposite from what userspace expects.
516  * This function is used to invert y before reporting.
517  */
518 static int synaptics_invert_y(int y)
519 {
520 	return YMAX_NOMINAL + YMIN_NOMINAL - y;
521 }
522 
523 /*
524  * Apply quirk(s) if the hardware matches
525  */
526 static void synaptics_apply_quirks(struct psmouse *psmouse,
527 				   struct synaptics_device_info *info)
528 {
529 	int i;
530 
531 	for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
532 		if (!psmouse_matches_pnp_id(psmouse,
533 					    min_max_pnpid_table[i].pnp_ids))
534 			continue;
535 
536 		if (min_max_pnpid_table[i].board_id.min != ANY_BOARD_ID &&
537 		    info->board_id < min_max_pnpid_table[i].board_id.min)
538 			continue;
539 
540 		if (min_max_pnpid_table[i].board_id.max != ANY_BOARD_ID &&
541 		    info->board_id > min_max_pnpid_table[i].board_id.max)
542 			continue;
543 
544 		info->x_min = min_max_pnpid_table[i].x_min;
545 		info->x_max = min_max_pnpid_table[i].x_max;
546 		info->y_min = min_max_pnpid_table[i].y_min;
547 		info->y_max = min_max_pnpid_table[i].y_max;
548 		psmouse_info(psmouse,
549 			     "quirked min/max coordinates: x [%d..%d], y [%d..%d]\n",
550 			     info->x_min, info->x_max,
551 			     info->y_min, info->y_max);
552 		break;
553 	}
554 }
555 
556 static bool synaptics_has_agm(struct synaptics_data *priv)
557 {
558 	return (SYN_CAP_ADV_GESTURE(priv->info.ext_cap_0c) ||
559 		SYN_CAP_IMAGE_SENSOR(priv->info.ext_cap_0c));
560 }
561 
562 static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
563 {
564 	static u8 param = 0xc8;
565 	int error;
566 
567 	error = ps2_sliced_command(&psmouse->ps2dev, SYN_QUE_MODEL);
568 	if (error)
569 		return error;
570 
571 	error = ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE);
572 	if (error)
573 		return error;
574 
575 	return 0;
576 }
577 
578 static int synaptics_set_mode(struct psmouse *psmouse)
579 {
580 	struct synaptics_data *priv = psmouse->private;
581 	int error;
582 
583 	priv->mode = 0;
584 	if (priv->absolute_mode)
585 		priv->mode |= SYN_BIT_ABSOLUTE_MODE;
586 	if (priv->disable_gesture)
587 		priv->mode |= SYN_BIT_DISABLE_GESTURE;
588 	if (psmouse->rate >= 80)
589 		priv->mode |= SYN_BIT_HIGH_RATE;
590 	if (SYN_CAP_EXTENDED(priv->info.capabilities))
591 		priv->mode |= SYN_BIT_W_MODE;
592 
593 	error = synaptics_mode_cmd(psmouse, priv->mode);
594 	if (error)
595 		return error;
596 
597 	if (priv->absolute_mode && synaptics_has_agm(priv)) {
598 		error = synaptics_set_advanced_gesture_mode(psmouse);
599 		if (error) {
600 			psmouse_err(psmouse,
601 				    "Advanced gesture mode init failed: %d\n",
602 				    error);
603 			return error;
604 		}
605 	}
606 
607 	return 0;
608 }
609 
610 static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
611 {
612 	struct synaptics_data *priv = psmouse->private;
613 
614 	if (rate >= 80) {
615 		priv->mode |= SYN_BIT_HIGH_RATE;
616 		psmouse->rate = 80;
617 	} else {
618 		priv->mode &= ~SYN_BIT_HIGH_RATE;
619 		psmouse->rate = 40;
620 	}
621 
622 	synaptics_mode_cmd(psmouse, priv->mode);
623 }
624 
625 /*****************************************************************************
626  *	Synaptics pass-through PS/2 port support
627  ****************************************************************************/
628 static int synaptics_pt_write(struct serio *serio, u8 c)
629 {
630 	struct psmouse *parent = serio_get_drvdata(serio->parent);
631 	u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
632 	int error;
633 
634 	error = ps2_sliced_command(&parent->ps2dev, c);
635 	if (error)
636 		return error;
637 
638 	error = ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
639 	if (error)
640 		return error;
641 
642 	return 0;
643 }
644 
645 static int synaptics_pt_start(struct serio *serio)
646 {
647 	struct psmouse *parent = serio_get_drvdata(serio->parent);
648 	struct synaptics_data *priv = parent->private;
649 
650 	serio_pause_rx(parent->ps2dev.serio);
651 	priv->pt_port = serio;
652 	serio_continue_rx(parent->ps2dev.serio);
653 
654 	return 0;
655 }
656 
657 static void synaptics_pt_stop(struct serio *serio)
658 {
659 	struct psmouse *parent = serio_get_drvdata(serio->parent);
660 	struct synaptics_data *priv = parent->private;
661 
662 	serio_pause_rx(parent->ps2dev.serio);
663 	priv->pt_port = NULL;
664 	serio_continue_rx(parent->ps2dev.serio);
665 }
666 
667 static int synaptics_is_pt_packet(u8 *buf)
668 {
669 	return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
670 }
671 
672 static void synaptics_pass_pt_packet(struct serio *ptport, u8 *packet)
673 {
674 	struct psmouse *child = serio_get_drvdata(ptport);
675 
676 	if (child && child->state == PSMOUSE_ACTIVATED) {
677 		serio_interrupt(ptport, packet[1], 0);
678 		serio_interrupt(ptport, packet[4], 0);
679 		serio_interrupt(ptport, packet[5], 0);
680 		if (child->pktsize == 4)
681 			serio_interrupt(ptport, packet[2], 0);
682 	} else {
683 		serio_interrupt(ptport, packet[1], 0);
684 	}
685 }
686 
687 static void synaptics_pt_activate(struct psmouse *psmouse)
688 {
689 	struct synaptics_data *priv = psmouse->private;
690 	struct psmouse *child = serio_get_drvdata(priv->pt_port);
691 
692 	/* adjust the touchpad to child's choice of protocol */
693 	if (child) {
694 		if (child->pktsize == 4)
695 			priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
696 		else
697 			priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
698 
699 		if (synaptics_mode_cmd(psmouse, priv->mode))
700 			psmouse_warn(psmouse,
701 				     "failed to switch guest protocol\n");
702 	}
703 }
704 
705 static void synaptics_pt_create(struct psmouse *psmouse)
706 {
707 	struct serio *serio;
708 
709 	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
710 	if (!serio) {
711 		psmouse_err(psmouse,
712 			    "not enough memory for pass-through port\n");
713 		return;
714 	}
715 
716 	serio->id.type = SERIO_PS_PSTHRU;
717 	strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
718 	strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->phys));
719 	serio->write = synaptics_pt_write;
720 	serio->start = synaptics_pt_start;
721 	serio->stop = synaptics_pt_stop;
722 	serio->parent = psmouse->ps2dev.serio;
723 
724 	psmouse->pt_activate = synaptics_pt_activate;
725 
726 	psmouse_info(psmouse, "serio: %s port at %s\n",
727 		     serio->name, psmouse->phys);
728 	serio_register_port(serio);
729 }
730 
731 /*****************************************************************************
732  *	Functions to interpret the absolute mode packets
733  ****************************************************************************/
734 
735 static void synaptics_parse_agm(const u8 buf[],
736 				struct synaptics_data *priv,
737 				struct synaptics_hw_state *hw)
738 {
739 	struct synaptics_hw_state *agm = &priv->agm;
740 	int agm_packet_type;
741 
742 	agm_packet_type = (buf[5] & 0x30) >> 4;
743 	switch (agm_packet_type) {
744 	case 1:
745 		/* Gesture packet: (x, y, z) half resolution */
746 		agm->w = hw->w;
747 		agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
748 		agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
749 		agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
750 		break;
751 
752 	case 2:
753 		/* AGM-CONTACT packet: we are only interested in the count */
754 		priv->agm_count = buf[1];
755 		break;
756 
757 	default:
758 		break;
759 	}
760 }
761 
762 static void synaptics_parse_ext_buttons(const u8 buf[],
763 					struct synaptics_data *priv,
764 					struct synaptics_hw_state *hw)
765 {
766 	unsigned int ext_bits =
767 		(SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
768 	unsigned int ext_mask = GENMASK(ext_bits - 1, 0);
769 
770 	hw->ext_buttons = buf[4] & ext_mask;
771 	hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
772 }
773 
774 static int synaptics_parse_hw_state(const u8 buf[],
775 				    struct synaptics_data *priv,
776 				    struct synaptics_hw_state *hw)
777 {
778 	memset(hw, 0, sizeof(struct synaptics_hw_state));
779 
780 	if (SYN_MODEL_NEWABS(priv->info.model_id)) {
781 		hw->w = (((buf[0] & 0x30) >> 2) |
782 			 ((buf[0] & 0x04) >> 1) |
783 			 ((buf[3] & 0x04) >> 2));
784 
785 		if (synaptics_has_agm(priv) && hw->w == 2) {
786 			synaptics_parse_agm(buf, priv, hw);
787 			return 1;
788 		}
789 
790 		hw->x = (((buf[3] & 0x10) << 8) |
791 			 ((buf[1] & 0x0f) << 8) |
792 			 buf[4]);
793 		hw->y = (((buf[3] & 0x20) << 7) |
794 			 ((buf[1] & 0xf0) << 4) |
795 			 buf[5]);
796 		hw->z = buf[2];
797 
798 		hw->left  = (buf[0] & 0x01) ? 1 : 0;
799 		hw->right = (buf[0] & 0x02) ? 1 : 0;
800 
801 		if (priv->is_forcepad) {
802 			/*
803 			 * ForcePads, like Clickpads, use middle button
804 			 * bits to report primary button clicks.
805 			 * Unfortunately they report primary button not
806 			 * only when user presses on the pad above certain
807 			 * threshold, but also when there are more than one
808 			 * finger on the touchpad, which interferes with
809 			 * out multi-finger gestures.
810 			 */
811 			if (hw->z == 0) {
812 				/* No contacts */
813 				priv->press = priv->report_press = false;
814 			} else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
815 				/*
816 				 * Single-finger touch with pressure above
817 				 * the threshold. If pressure stays long
818 				 * enough, we'll start reporting primary
819 				 * button. We rely on the device continuing
820 				 * sending data even if finger does not
821 				 * move.
822 				 */
823 				if  (!priv->press) {
824 					priv->press_start = jiffies;
825 					priv->press = true;
826 				} else if (time_after(jiffies,
827 						priv->press_start +
828 							msecs_to_jiffies(50))) {
829 					priv->report_press = true;
830 				}
831 			} else {
832 				priv->press = false;
833 			}
834 
835 			hw->left = priv->report_press;
836 
837 		} else if (SYN_CAP_CLICKPAD(priv->info.ext_cap_0c)) {
838 			/*
839 			 * Clickpad's button is transmitted as middle button,
840 			 * however, since it is primary button, we will report
841 			 * it as BTN_LEFT.
842 			 */
843 			hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
844 
845 		} else if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities)) {
846 			hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
847 			if (hw->w == 2)
848 				hw->scroll = (s8)buf[1];
849 		}
850 
851 		if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
852 			hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
853 			hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
854 		}
855 
856 		if (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) > 0 &&
857 		    ((buf[0] ^ buf[3]) & 0x02)) {
858 			synaptics_parse_ext_buttons(buf, priv, hw);
859 		}
860 	} else {
861 		hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
862 		hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
863 
864 		hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
865 		hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
866 
867 		hw->left  = (buf[0] & 0x01) ? 1 : 0;
868 		hw->right = (buf[0] & 0x02) ? 1 : 0;
869 	}
870 
871 	/*
872 	 * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
873 	 * is used by some firmware to indicate a finger at the edge of
874 	 * the touchpad whose precise position cannot be determined, so
875 	 * convert these values to the maximum axis value.
876 	 */
877 	if (hw->x > X_MAX_POSITIVE)
878 		hw->x -= 1 << ABS_POS_BITS;
879 	else if (hw->x == X_MAX_POSITIVE)
880 		hw->x = XMAX;
881 
882 	if (hw->y > Y_MAX_POSITIVE)
883 		hw->y -= 1 << ABS_POS_BITS;
884 	else if (hw->y == Y_MAX_POSITIVE)
885 		hw->y = YMAX;
886 
887 	return 0;
888 }
889 
890 static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
891 					  bool active, int x, int y)
892 {
893 	input_mt_slot(dev, slot);
894 	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
895 	if (active) {
896 		input_report_abs(dev, ABS_MT_POSITION_X, x);
897 		input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
898 	}
899 }
900 
901 static void synaptics_report_semi_mt_data(struct input_dev *dev,
902 					  const struct synaptics_hw_state *a,
903 					  const struct synaptics_hw_state *b,
904 					  int num_fingers)
905 {
906 	if (num_fingers >= 2) {
907 		synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
908 					      min(a->y, b->y));
909 		synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
910 					      max(a->y, b->y));
911 	} else if (num_fingers == 1) {
912 		synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
913 		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
914 	} else {
915 		synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
916 		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
917 	}
918 }
919 
920 static void synaptics_report_ext_buttons(struct psmouse *psmouse,
921 					 const struct synaptics_hw_state *hw)
922 {
923 	struct input_dev *dev = psmouse->dev;
924 	struct synaptics_data *priv = psmouse->private;
925 	int ext_bits = (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
926 	int i;
927 
928 	if (!SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap))
929 		return;
930 
931 	/* Bug in FW 8.1 & 8.2, buttons are reported only when ExtBit is 1 */
932 	if ((SYN_ID_FULL(priv->info.identity) == 0x801 ||
933 	     SYN_ID_FULL(priv->info.identity) == 0x802) &&
934 	    !((psmouse->packet[0] ^ psmouse->packet[3]) & 0x02))
935 		return;
936 
937 	if (!SYN_CAP_EXT_BUTTONS_STICK(priv->info.ext_cap_10)) {
938 		for (i = 0; i < ext_bits; i++) {
939 			input_report_key(dev, BTN_0 + 2 * i,
940 				hw->ext_buttons & BIT(i));
941 			input_report_key(dev, BTN_1 + 2 * i,
942 				hw->ext_buttons & BIT(i + ext_bits));
943 		}
944 		return;
945 	}
946 
947 	/*
948 	 * This generation of touchpads has the trackstick buttons
949 	 * physically wired to the touchpad. Re-route them through
950 	 * the pass-through interface.
951 	 */
952 	if (priv->pt_port) {
953 		u8 pt_buttons;
954 
955 		/* The trackstick expects at most 3 buttons */
956 		pt_buttons = SYN_EXT_BUTTON_STICK_L(hw->ext_buttons)      |
957 			     SYN_EXT_BUTTON_STICK_R(hw->ext_buttons) << 1 |
958 			     SYN_EXT_BUTTON_STICK_M(hw->ext_buttons) << 2;
959 
960 		serio_interrupt(priv->pt_port,
961 				PSMOUSE_OOB_EXTRA_BTNS, SERIO_OOB_DATA);
962 		serio_interrupt(priv->pt_port, pt_buttons, SERIO_OOB_DATA);
963 	}
964 }
965 
966 static void synaptics_report_buttons(struct psmouse *psmouse,
967 				     const struct synaptics_hw_state *hw)
968 {
969 	struct input_dev *dev = psmouse->dev;
970 	struct synaptics_data *priv = psmouse->private;
971 
972 	input_report_key(dev, BTN_LEFT, hw->left);
973 	input_report_key(dev, BTN_RIGHT, hw->right);
974 
975 	if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities))
976 		input_report_key(dev, BTN_MIDDLE, hw->middle);
977 
978 	if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
979 		input_report_key(dev, BTN_FORWARD, hw->up);
980 		input_report_key(dev, BTN_BACK, hw->down);
981 	}
982 
983 	synaptics_report_ext_buttons(psmouse, hw);
984 }
985 
986 static void synaptics_report_mt_data(struct psmouse *psmouse,
987 				     const struct synaptics_hw_state *sgm,
988 				     int num_fingers)
989 {
990 	struct input_dev *dev = psmouse->dev;
991 	struct synaptics_data *priv = psmouse->private;
992 	const struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
993 	struct input_mt_pos pos[2];
994 	int slot[2], nsemi, i;
995 
996 	nsemi = clamp_val(num_fingers, 0, 2);
997 
998 	for (i = 0; i < nsemi; i++) {
999 		pos[i].x = hw[i]->x;
1000 		pos[i].y = synaptics_invert_y(hw[i]->y);
1001 	}
1002 
1003 	input_mt_assign_slots(dev, slot, pos, nsemi, DMAX * priv->info.x_res);
1004 
1005 	for (i = 0; i < nsemi; i++) {
1006 		input_mt_slot(dev, slot[i]);
1007 		input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
1008 		input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
1009 		input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
1010 		input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
1011 	}
1012 
1013 	input_mt_drop_unused(dev);
1014 
1015 	/* Don't use active slot count to generate BTN_TOOL events. */
1016 	input_mt_report_pointer_emulation(dev, false);
1017 
1018 	/* Send the number of fingers reported by touchpad itself. */
1019 	input_mt_report_finger_count(dev, num_fingers);
1020 
1021 	synaptics_report_buttons(psmouse, sgm);
1022 
1023 	input_sync(dev);
1024 }
1025 
1026 static void synaptics_image_sensor_process(struct psmouse *psmouse,
1027 					   struct synaptics_hw_state *sgm)
1028 {
1029 	struct synaptics_data *priv = psmouse->private;
1030 	int num_fingers;
1031 
1032 	/*
1033 	 * Update mt_state using the new finger count and current mt_state.
1034 	 */
1035 	if (sgm->z == 0)
1036 		num_fingers = 0;
1037 	else if (sgm->w >= 4)
1038 		num_fingers = 1;
1039 	else if (sgm->w == 0)
1040 		num_fingers = 2;
1041 	else if (sgm->w == 1)
1042 		num_fingers = priv->agm_count ? priv->agm_count : 3;
1043 	else
1044 		num_fingers = 4;
1045 
1046 	/* Send resulting input events to user space */
1047 	synaptics_report_mt_data(psmouse, sgm, num_fingers);
1048 }
1049 
1050 static bool synaptics_has_multifinger(struct synaptics_data *priv)
1051 {
1052 	if (SYN_CAP_MULTIFINGER(priv->info.capabilities))
1053 		return true;
1054 
1055 	/* Advanced gesture mode also sends multi finger data */
1056 	return synaptics_has_agm(priv);
1057 }
1058 
1059 /*
1060  *  called for each full received packet from the touchpad
1061  */
1062 static void synaptics_process_packet(struct psmouse *psmouse)
1063 {
1064 	struct input_dev *dev = psmouse->dev;
1065 	struct synaptics_data *priv = psmouse->private;
1066 	struct synaptics_device_info *info = &priv->info;
1067 	struct synaptics_hw_state hw;
1068 	int num_fingers;
1069 	int finger_width;
1070 
1071 	if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
1072 		return;
1073 
1074 	if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1075 		synaptics_image_sensor_process(psmouse, &hw);
1076 		return;
1077 	}
1078 
1079 	if (hw.scroll) {
1080 		priv->scroll += hw.scroll;
1081 
1082 		while (priv->scroll >= 4) {
1083 			input_report_key(dev, BTN_BACK, !hw.down);
1084 			input_sync(dev);
1085 			input_report_key(dev, BTN_BACK, hw.down);
1086 			input_sync(dev);
1087 			priv->scroll -= 4;
1088 		}
1089 		while (priv->scroll <= -4) {
1090 			input_report_key(dev, BTN_FORWARD, !hw.up);
1091 			input_sync(dev);
1092 			input_report_key(dev, BTN_FORWARD, hw.up);
1093 			input_sync(dev);
1094 			priv->scroll += 4;
1095 		}
1096 		return;
1097 	}
1098 
1099 	if (hw.z > 0 && hw.x > 1) {
1100 		num_fingers = 1;
1101 		finger_width = 5;
1102 		if (SYN_CAP_EXTENDED(info->capabilities)) {
1103 			switch (hw.w) {
1104 			case 0 ... 1:
1105 				if (synaptics_has_multifinger(priv))
1106 					num_fingers = hw.w + 2;
1107 				break;
1108 			case 2:
1109 				if (SYN_MODEL_PEN(info->model_id))
1110 					;   /* Nothing, treat a pen as a single finger */
1111 				break;
1112 			case 4 ... 15:
1113 				if (SYN_CAP_PALMDETECT(info->capabilities))
1114 					finger_width = hw.w;
1115 				break;
1116 			}
1117 		}
1118 	} else {
1119 		num_fingers = 0;
1120 		finger_width = 0;
1121 	}
1122 
1123 	if (cr48_profile_sensor) {
1124 		synaptics_report_mt_data(psmouse, &hw, num_fingers);
1125 		return;
1126 	}
1127 
1128 	if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c))
1129 		synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
1130 					      num_fingers);
1131 
1132 	/* Post events
1133 	 * BTN_TOUCH has to be first as mousedev relies on it when doing
1134 	 * absolute -> relative conversion
1135 	 */
1136 	if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
1137 	if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
1138 
1139 	if (num_fingers > 0) {
1140 		input_report_abs(dev, ABS_X, hw.x);
1141 		input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
1142 	}
1143 	input_report_abs(dev, ABS_PRESSURE, hw.z);
1144 
1145 	if (SYN_CAP_PALMDETECT(info->capabilities))
1146 		input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
1147 
1148 	input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
1149 	if (synaptics_has_multifinger(priv)) {
1150 		input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
1151 		input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
1152 	}
1153 
1154 	synaptics_report_buttons(psmouse, &hw);
1155 
1156 	input_sync(dev);
1157 }
1158 
1159 static bool synaptics_validate_byte(struct psmouse *psmouse,
1160 				    int idx, enum synaptics_pkt_type pkt_type)
1161 {
1162 	static const u8 newabs_mask[]	  = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
1163 	static const u8 newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
1164 	static const u8 newabs_rslt[]	  = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
1165 	static const u8 oldabs_mask[]	  = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
1166 	static const u8 oldabs_rslt[]	  = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
1167 	const u8 *packet = psmouse->packet;
1168 
1169 	if (idx < 0 || idx > 4)
1170 		return false;
1171 
1172 	switch (pkt_type) {
1173 
1174 	case SYN_NEWABS:
1175 	case SYN_NEWABS_RELAXED:
1176 		return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
1177 
1178 	case SYN_NEWABS_STRICT:
1179 		return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
1180 
1181 	case SYN_OLDABS:
1182 		return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
1183 
1184 	default:
1185 		psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
1186 		return false;
1187 	}
1188 }
1189 
1190 static enum synaptics_pkt_type
1191 synaptics_detect_pkt_type(struct psmouse *psmouse)
1192 {
1193 	int i;
1194 
1195 	for (i = 0; i < 5; i++) {
1196 		if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
1197 			psmouse_info(psmouse, "using relaxed packet validation\n");
1198 			return SYN_NEWABS_RELAXED;
1199 		}
1200 	}
1201 
1202 	return SYN_NEWABS_STRICT;
1203 }
1204 
1205 static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
1206 {
1207 	struct synaptics_data *priv = psmouse->private;
1208 
1209 	if (psmouse->pktcnt >= 6) { /* Full packet received */
1210 		if (unlikely(priv->pkt_type == SYN_NEWABS))
1211 			priv->pkt_type = synaptics_detect_pkt_type(psmouse);
1212 
1213 		if (SYN_CAP_PASS_THROUGH(priv->info.capabilities) &&
1214 		    synaptics_is_pt_packet(psmouse->packet)) {
1215 			if (priv->pt_port)
1216 				synaptics_pass_pt_packet(priv->pt_port,
1217 							 psmouse->packet);
1218 		} else
1219 			synaptics_process_packet(psmouse);
1220 
1221 		return PSMOUSE_FULL_PACKET;
1222 	}
1223 
1224 	return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
1225 		PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
1226 }
1227 
1228 /*****************************************************************************
1229  *	Driver initialization/cleanup functions
1230  ****************************************************************************/
1231 static void set_abs_position_params(struct input_dev *dev,
1232 				    struct synaptics_device_info *info,
1233 				    int x_code, int y_code)
1234 {
1235 	int x_min = info->x_min ?: XMIN_NOMINAL;
1236 	int x_max = info->x_max ?: XMAX_NOMINAL;
1237 	int y_min = info->y_min ?: YMIN_NOMINAL;
1238 	int y_max = info->y_max ?: YMAX_NOMINAL;
1239 	int fuzz = SYN_CAP_REDUCED_FILTERING(info->ext_cap_0c) ?
1240 			SYN_REDUCED_FILTER_FUZZ : 0;
1241 
1242 	input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
1243 	input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
1244 	input_abs_set_res(dev, x_code, info->x_res);
1245 	input_abs_set_res(dev, y_code, info->y_res);
1246 }
1247 
1248 static int set_input_params(struct psmouse *psmouse,
1249 			    struct synaptics_data *priv)
1250 {
1251 	struct input_dev *dev = psmouse->dev;
1252 	struct synaptics_device_info *info = &priv->info;
1253 	int i;
1254 	int error;
1255 
1256 	/* Reset default psmouse capabilities */
1257 	__clear_bit(EV_REL, dev->evbit);
1258 	bitmap_zero(dev->relbit, REL_CNT);
1259 	bitmap_zero(dev->keybit, KEY_CNT);
1260 
1261 	/* Things that apply to both modes */
1262 	__set_bit(INPUT_PROP_POINTER, dev->propbit);
1263 
1264 	input_set_capability(dev, EV_KEY, BTN_LEFT);
1265 
1266 	/* Clickpads report only left button */
1267 	if (!SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1268 		input_set_capability(dev, EV_KEY, BTN_RIGHT);
1269 		if (SYN_CAP_MIDDLE_BUTTON(info->capabilities))
1270 			input_set_capability(dev, EV_KEY, BTN_MIDDLE);
1271 	}
1272 
1273 	if (!priv->absolute_mode) {
1274 		/* Relative mode */
1275 		input_set_capability(dev, EV_REL, REL_X);
1276 		input_set_capability(dev, EV_REL, REL_Y);
1277 		return 0;
1278 	}
1279 
1280 	/* Absolute mode */
1281 	set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1282 	input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
1283 
1284 	if (cr48_profile_sensor)
1285 		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1286 
1287 	if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1288 		set_abs_position_params(dev, info,
1289 					ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1290 		/* Image sensors can report per-contact pressure */
1291 		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1292 
1293 		error = input_mt_init_slots(dev, 2,
1294 					    INPUT_MT_POINTER | INPUT_MT_TRACK);
1295 		if (error)
1296 			return error;
1297 
1298 		/* Image sensors can signal 4 and 5 finger clicks */
1299 		input_set_capability(dev, EV_KEY, BTN_TOOL_QUADTAP);
1300 		input_set_capability(dev, EV_KEY, BTN_TOOL_QUINTTAP);
1301 	} else if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c)) {
1302 		set_abs_position_params(dev, info,
1303 					ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1304 		/*
1305 		 * Profile sensor in CR-48 tracks contacts reasonably well,
1306 		 * other non-image sensors with AGM use semi-mt.
1307 		 */
1308 		error = input_mt_init_slots(dev, 2,
1309 					    INPUT_MT_POINTER |
1310 					     (cr48_profile_sensor ?
1311 					      INPUT_MT_TRACK :
1312 					      INPUT_MT_SEMI_MT));
1313 		if (error)
1314 			return error;
1315 
1316 		/*
1317 		 * For semi-mt devices we send ABS_X/Y ourselves instead of
1318 		 * input_mt_report_pointer_emulation. But
1319 		 * input_mt_init_slots() resets the fuzz to 0, leading to a
1320 		 * filtered ABS_MT_POSITION_X but an unfiltered ABS_X
1321 		 * position. Let's re-initialize ABS_X/Y here.
1322 		 */
1323 		if (!cr48_profile_sensor)
1324 			set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1325 	}
1326 
1327 	if (SYN_CAP_PALMDETECT(info->capabilities))
1328 		input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
1329 
1330 	input_set_capability(dev, EV_KEY, BTN_TOUCH);
1331 	input_set_capability(dev, EV_KEY, BTN_TOOL_FINGER);
1332 
1333 	if (synaptics_has_multifinger(priv)) {
1334 		input_set_capability(dev, EV_KEY, BTN_TOOL_DOUBLETAP);
1335 		input_set_capability(dev, EV_KEY, BTN_TOOL_TRIPLETAP);
1336 	}
1337 
1338 	if (SYN_CAP_FOUR_BUTTON(info->capabilities) ||
1339 	    SYN_CAP_MIDDLE_BUTTON(info->capabilities)) {
1340 		input_set_capability(dev, EV_KEY, BTN_FORWARD);
1341 		input_set_capability(dev, EV_KEY, BTN_BACK);
1342 	}
1343 
1344 	if (!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1345 		for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(info->ext_cap); i++)
1346 			input_set_capability(dev, EV_KEY, BTN_0 + i);
1347 
1348 	if (SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1349 		__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1350 		if (psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1351 		    !SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1352 			__set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
1353 	}
1354 
1355 	return 0;
1356 }
1357 
1358 static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
1359 					      void *data, char *buf)
1360 {
1361 	struct synaptics_data *priv = psmouse->private;
1362 
1363 	return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
1364 }
1365 
1366 static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
1367 					     void *data, const char *buf,
1368 					     size_t len)
1369 {
1370 	struct synaptics_data *priv = psmouse->private;
1371 	unsigned int value;
1372 	int err;
1373 
1374 	err = kstrtouint(buf, 10, &value);
1375 	if (err)
1376 		return err;
1377 
1378 	if (value > 1)
1379 		return -EINVAL;
1380 
1381 	if (value == priv->disable_gesture)
1382 		return len;
1383 
1384 	priv->disable_gesture = value;
1385 	if (value)
1386 		priv->mode |= SYN_BIT_DISABLE_GESTURE;
1387 	else
1388 		priv->mode &= ~SYN_BIT_DISABLE_GESTURE;
1389 
1390 	if (synaptics_mode_cmd(psmouse, priv->mode))
1391 		return -EIO;
1392 
1393 	return len;
1394 }
1395 
1396 PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
1397 		    synaptics_show_disable_gesture,
1398 		    synaptics_set_disable_gesture);
1399 
1400 static void synaptics_disconnect(struct psmouse *psmouse)
1401 {
1402 	struct synaptics_data *priv = psmouse->private;
1403 
1404 	/*
1405 	 * We might have left a breadcrumb when trying to
1406 	 * set up SMbus companion.
1407 	 */
1408 	psmouse_smbus_cleanup(psmouse);
1409 
1410 	if (!priv->absolute_mode &&
1411 			SYN_ID_DISGEST_SUPPORTED(priv->info.identity))
1412 		device_remove_file(&psmouse->ps2dev.serio->dev,
1413 				   &psmouse_attr_disable_gesture.dattr);
1414 
1415 	synaptics_reset(psmouse);
1416 	kfree(priv);
1417 	psmouse->private = NULL;
1418 }
1419 
1420 static int synaptics_reconnect(struct psmouse *psmouse)
1421 {
1422 	struct synaptics_data *priv = psmouse->private;
1423 	struct synaptics_device_info info;
1424 	u8 param[2];
1425 	int retry = 0;
1426 	int error;
1427 
1428 	do {
1429 		psmouse_reset(psmouse);
1430 		if (retry) {
1431 			/*
1432 			 * On some boxes, right after resuming, the touchpad
1433 			 * needs some time to finish initializing (I assume
1434 			 * it needs time to calibrate) and start responding
1435 			 * to Synaptics-specific queries, so let's wait a
1436 			 * bit.
1437 			 */
1438 			ssleep(1);
1439 		}
1440 		ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
1441 		error = synaptics_detect(psmouse, 0);
1442 	} while (error && ++retry < 3);
1443 
1444 	if (error)
1445 		return error;
1446 
1447 	if (retry > 1)
1448 		psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
1449 
1450 	error = synaptics_query_hardware(psmouse, &info);
1451 	if (error) {
1452 		psmouse_err(psmouse, "Unable to query device.\n");
1453 		return error;
1454 	}
1455 
1456 	error = synaptics_set_mode(psmouse);
1457 	if (error) {
1458 		psmouse_err(psmouse, "Unable to initialize device.\n");
1459 		return error;
1460 	}
1461 
1462 	if (info.identity != priv->info.identity ||
1463 	    info.model_id != priv->info.model_id ||
1464 	    info.capabilities != priv->info.capabilities ||
1465 	    info.ext_cap != priv->info.ext_cap) {
1466 		psmouse_err(psmouse,
1467 			    "hardware appears to be different: id(%u-%u), model(%u-%u), caps(%x-%x), ext(%x-%x).\n",
1468 			    priv->info.identity, info.identity,
1469 			    priv->info.model_id, info.model_id,
1470 			    priv->info.capabilities, info.capabilities,
1471 			    priv->info.ext_cap, info.ext_cap);
1472 		return -ENXIO;
1473 	}
1474 
1475 	return 0;
1476 }
1477 
1478 static bool impaired_toshiba_kbc;
1479 
1480 static const struct dmi_system_id toshiba_dmi_table[] __initconst = {
1481 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1482 	{
1483 		/* Toshiba Satellite */
1484 		.matches = {
1485 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1486 			DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
1487 		},
1488 	},
1489 	{
1490 		/* Toshiba Dynabook */
1491 		.matches = {
1492 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1493 			DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
1494 		},
1495 	},
1496 	{
1497 		/* Toshiba Portege M300 */
1498 		.matches = {
1499 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1500 			DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
1501 		},
1502 
1503 	},
1504 	{
1505 		/* Toshiba Portege M300 */
1506 		.matches = {
1507 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1508 			DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
1509 			DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
1510 		},
1511 
1512 	},
1513 #endif
1514 	{ }
1515 };
1516 
1517 static bool broken_olpc_ec;
1518 
1519 static const struct dmi_system_id olpc_dmi_table[] __initconst = {
1520 #if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
1521 	{
1522 		/* OLPC XO-1 or XO-1.5 */
1523 		.matches = {
1524 			DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
1525 			DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
1526 		},
1527 	},
1528 #endif
1529 	{ }
1530 };
1531 
1532 static const struct dmi_system_id __initconst cr48_dmi_table[] = {
1533 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1534 	{
1535 		/* Cr-48 Chromebook (Codename Mario) */
1536 		.matches = {
1537 			DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
1538 			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
1539 		},
1540 	},
1541 #endif
1542 	{ }
1543 };
1544 
1545 void __init synaptics_module_init(void)
1546 {
1547 	impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
1548 	broken_olpc_ec = dmi_check_system(olpc_dmi_table);
1549 	cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
1550 }
1551 
1552 static int synaptics_init_ps2(struct psmouse *psmouse,
1553 			      struct synaptics_device_info *info,
1554 			      bool absolute_mode)
1555 {
1556 	struct synaptics_data *priv;
1557 	int err;
1558 
1559 	synaptics_apply_quirks(psmouse, info);
1560 
1561 	psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
1562 	if (!priv)
1563 		return -ENOMEM;
1564 
1565 	priv->info = *info;
1566 	priv->absolute_mode = absolute_mode;
1567 	if (SYN_ID_DISGEST_SUPPORTED(info->identity))
1568 		priv->disable_gesture = true;
1569 
1570 	/*
1571 	 * Unfortunately ForcePad capability is not exported over PS/2,
1572 	 * so we have to resort to checking PNP IDs.
1573 	 */
1574 	priv->is_forcepad = psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids);
1575 
1576 	err = synaptics_set_mode(psmouse);
1577 	if (err) {
1578 		psmouse_err(psmouse, "Unable to initialize device.\n");
1579 		goto init_fail;
1580 	}
1581 
1582 	priv->pkt_type = SYN_MODEL_NEWABS(info->model_id) ?
1583 					SYN_NEWABS : SYN_OLDABS;
1584 
1585 	psmouse_info(psmouse,
1586 		     "Touchpad model: %lu, fw: %lu.%lu, id: %#x, caps: %#x/%#x/%#x/%#x, board id: %u, fw id: %u\n",
1587 		     SYN_ID_MODEL(info->identity),
1588 		     SYN_ID_MAJOR(info->identity), SYN_ID_MINOR(info->identity),
1589 		     info->model_id,
1590 		     info->capabilities, info->ext_cap, info->ext_cap_0c,
1591 		     info->ext_cap_10, info->board_id, info->firmware_id);
1592 
1593 	err = set_input_params(psmouse, priv);
1594 	if (err) {
1595 		psmouse_err(psmouse,
1596 			    "failed to set up capabilities: %d\n", err);
1597 		goto init_fail;
1598 	}
1599 
1600 	/*
1601 	 * Encode touchpad model so that it can be used to set
1602 	 * input device->id.version and be visible to userspace.
1603 	 * Because version is __u16 we have to drop something.
1604 	 * Hardware info bits seem to be good candidates as they
1605 	 * are documented to be for Synaptics corp. internal use.
1606 	 */
1607 	psmouse->model = ((info->model_id & 0x00ff0000) >> 8) |
1608 			  (info->model_id & 0x000000ff);
1609 
1610 	if (absolute_mode) {
1611 		psmouse->protocol_handler = synaptics_process_byte;
1612 		psmouse->pktsize = 6;
1613 	} else {
1614 		/* Relative mode follows standard PS/2 mouse protocol */
1615 		psmouse->protocol_handler = psmouse_process_byte;
1616 		psmouse->pktsize = 3;
1617 	}
1618 
1619 	psmouse->set_rate = synaptics_set_rate;
1620 	psmouse->disconnect = synaptics_disconnect;
1621 	psmouse->reconnect = synaptics_reconnect;
1622 	psmouse->cleanup = synaptics_reset;
1623 	/* Synaptics can usually stay in sync without extra help */
1624 	psmouse->resync_time = 0;
1625 
1626 	if (SYN_CAP_PASS_THROUGH(info->capabilities))
1627 		synaptics_pt_create(psmouse);
1628 
1629 	/*
1630 	 * Toshiba's KBC seems to have trouble handling data from
1631 	 * Synaptics at full rate.  Switch to a lower rate (roughly
1632 	 * the same rate as a standard PS/2 mouse).
1633 	 */
1634 	if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
1635 		psmouse_info(psmouse,
1636 			     "Toshiba %s detected, limiting rate to 40pps.\n",
1637 			     dmi_get_system_info(DMI_PRODUCT_NAME));
1638 		psmouse->rate = 40;
1639 	}
1640 
1641 	if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(info->identity)) {
1642 		err = device_create_file(&psmouse->ps2dev.serio->dev,
1643 					 &psmouse_attr_disable_gesture.dattr);
1644 		if (err) {
1645 			psmouse_err(psmouse,
1646 				    "Failed to create disable_gesture attribute (%d)",
1647 				    err);
1648 			goto init_fail;
1649 		}
1650 	}
1651 
1652 	return 0;
1653 
1654  init_fail:
1655 	kfree(priv);
1656 	return err;
1657 }
1658 
1659 static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
1660 {
1661 	struct synaptics_device_info info;
1662 	int error;
1663 
1664 	psmouse_reset(psmouse);
1665 
1666 	error = synaptics_query_hardware(psmouse, &info);
1667 	if (error) {
1668 		psmouse_err(psmouse, "Unable to query device: %d\n", error);
1669 		return error;
1670 	}
1671 
1672 	return synaptics_init_ps2(psmouse, &info, absolute_mode);
1673 }
1674 
1675 int synaptics_init_absolute(struct psmouse *psmouse)
1676 {
1677 	return __synaptics_init(psmouse, true);
1678 }
1679 
1680 int synaptics_init_relative(struct psmouse *psmouse)
1681 {
1682 	return __synaptics_init(psmouse, false);
1683 }
1684 
1685 static int synaptics_setup_ps2(struct psmouse *psmouse,
1686 			       struct synaptics_device_info *info)
1687 {
1688 	bool absolute_mode = true;
1689 	int error;
1690 
1691 	/*
1692 	 * The OLPC XO has issues with Synaptics' absolute mode; the constant
1693 	 * packet spew overloads the EC such that key presses on the keyboard
1694 	 * are missed.  Given that, don't even attempt to use Absolute mode.
1695 	 * Relative mode seems to work just fine.
1696 	 */
1697 	if (broken_olpc_ec) {
1698 		psmouse_info(psmouse,
1699 			     "OLPC XO detected, forcing relative protocol.\n");
1700 		absolute_mode = false;
1701 	}
1702 
1703 	error = synaptics_init_ps2(psmouse, info, absolute_mode);
1704 	if (error)
1705 		return error;
1706 
1707 	return absolute_mode ? PSMOUSE_SYNAPTICS : PSMOUSE_SYNAPTICS_RELATIVE;
1708 }
1709 
1710 #else /* CONFIG_MOUSE_PS2_SYNAPTICS */
1711 
1712 void __init synaptics_module_init(void)
1713 {
1714 }
1715 
1716 static int __maybe_unused
1717 synaptics_setup_ps2(struct psmouse *psmouse,
1718 		    struct synaptics_device_info *info)
1719 {
1720 	return -ENOSYS;
1721 }
1722 
1723 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS */
1724 
1725 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
1726 
1727 /*
1728  * The newest Synaptics device can use a secondary bus (called InterTouch) which
1729  * provides a better bandwidth and allow a better control of the touchpads.
1730  * This is used to decide if we need to use this bus or not.
1731  */
1732 enum {
1733 	SYNAPTICS_INTERTOUCH_NOT_SET = -1,
1734 	SYNAPTICS_INTERTOUCH_OFF,
1735 	SYNAPTICS_INTERTOUCH_ON,
1736 };
1737 
1738 static int synaptics_intertouch = IS_ENABLED(CONFIG_RMI4_SMB) ?
1739 		SYNAPTICS_INTERTOUCH_NOT_SET : SYNAPTICS_INTERTOUCH_OFF;
1740 module_param_named(synaptics_intertouch, synaptics_intertouch, int, 0644);
1741 MODULE_PARM_DESC(synaptics_intertouch, "Use a secondary bus for the Synaptics device.");
1742 
1743 static int synaptics_create_intertouch(struct psmouse *psmouse,
1744 				       struct synaptics_device_info *info,
1745 				       bool leave_breadcrumbs)
1746 {
1747 	bool topbuttonpad =
1748 		psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1749 		!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10);
1750 	const struct rmi_device_platform_data pdata = {
1751 		.sensor_pdata = {
1752 			.sensor_type = rmi_sensor_touchpad,
1753 			.axis_align.flip_y = true,
1754 			.kernel_tracking = false,
1755 			.topbuttonpad = topbuttonpad,
1756 		},
1757 		.gpio_data = {
1758 			.buttonpad = SYN_CAP_CLICKPAD(info->ext_cap_0c),
1759 			.trackstick_buttons =
1760 				!!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10),
1761 		},
1762 	};
1763 	const struct i2c_board_info intertouch_board = {
1764 		I2C_BOARD_INFO("rmi4_smbus", 0x2c),
1765 		.flags = I2C_CLIENT_HOST_NOTIFY,
1766 	};
1767 
1768 	return psmouse_smbus_init(psmouse, &intertouch_board,
1769 				  &pdata, sizeof(pdata), true,
1770 				  leave_breadcrumbs);
1771 }
1772 
1773 /*
1774  * synaptics_setup_intertouch - called once the PS/2 devices are enumerated
1775  * and decides to instantiate a SMBus InterTouch device.
1776  */
1777 static int synaptics_setup_intertouch(struct psmouse *psmouse,
1778 				      struct synaptics_device_info *info,
1779 				      bool leave_breadcrumbs)
1780 {
1781 	int error;
1782 
1783 	if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_OFF)
1784 		return -ENXIO;
1785 
1786 	if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_NOT_SET) {
1787 		if (!psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1788 		    !psmouse_matches_pnp_id(psmouse, smbus_pnp_ids)) {
1789 
1790 			if (!psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids))
1791 				psmouse_info(psmouse,
1792 					     "Your touchpad (%s) says it can support a different bus. "
1793 					     "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",
1794 					     psmouse->ps2dev.serio->firmware_id);
1795 
1796 			return -ENXIO;
1797 		}
1798 	}
1799 
1800 	psmouse_info(psmouse, "Trying to set up SMBus access\n");
1801 
1802 	error = synaptics_create_intertouch(psmouse, info, leave_breadcrumbs);
1803 	if (error) {
1804 		if (error == -EAGAIN)
1805 			psmouse_info(psmouse, "SMbus companion is not ready yet\n");
1806 		else
1807 			psmouse_err(psmouse, "unable to create intertouch device\n");
1808 
1809 		return error;
1810 	}
1811 
1812 	return 0;
1813 }
1814 
1815 int synaptics_init_smbus(struct psmouse *psmouse)
1816 {
1817 	struct synaptics_device_info info;
1818 	int error;
1819 
1820 	psmouse_reset(psmouse);
1821 
1822 	error = synaptics_query_hardware(psmouse, &info);
1823 	if (error) {
1824 		psmouse_err(psmouse, "Unable to query device: %d\n", error);
1825 		return error;
1826 	}
1827 
1828 	if (!SYN_CAP_INTERTOUCH(info.ext_cap_0c))
1829 		return -ENXIO;
1830 
1831 	return synaptics_create_intertouch(psmouse, &info, false);
1832 }
1833 
1834 #else /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1835 
1836 static int __maybe_unused
1837 synaptics_setup_intertouch(struct psmouse *psmouse,
1838 			   struct synaptics_device_info *info,
1839 			   bool leave_breadcrumbs)
1840 {
1841 	return -ENOSYS;
1842 }
1843 
1844 int synaptics_init_smbus(struct psmouse *psmouse)
1845 {
1846 	return -ENOSYS;
1847 }
1848 
1849 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1850 
1851 #if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
1852     defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
1853 
1854 int synaptics_init(struct psmouse *psmouse)
1855 {
1856 	struct synaptics_device_info info;
1857 	int error;
1858 	int retval;
1859 
1860 	psmouse_reset(psmouse);
1861 
1862 	error = synaptics_query_hardware(psmouse, &info);
1863 	if (error) {
1864 		psmouse_err(psmouse, "Unable to query device: %d\n", error);
1865 		return error;
1866 	}
1867 
1868 	if (SYN_CAP_INTERTOUCH(info.ext_cap_0c)) {
1869 		if ((!IS_ENABLED(CONFIG_RMI4_SMB) ||
1870 		     !IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) &&
1871 		    /* Forcepads need F21, which is not ready */
1872 		    !psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids)) {
1873 			psmouse_warn(psmouse,
1874 				     "The touchpad can support a better bus than the too old PS/2 protocol. "
1875 				     "Make sure MOUSE_PS2_SYNAPTICS_SMBUS and RMI4_SMB are enabled to get a better touchpad experience.\n");
1876 		}
1877 
1878 		error = synaptics_setup_intertouch(psmouse, &info, true);
1879 		if (!error)
1880 			return PSMOUSE_SYNAPTICS_SMBUS;
1881 	}
1882 
1883 	retval = synaptics_setup_ps2(psmouse, &info);
1884 	if (retval < 0) {
1885 		/*
1886 		 * Not using any flavor of Synaptics support, so clean up
1887 		 * SMbus breadcrumbs, if any.
1888 		 */
1889 		psmouse_smbus_cleanup(psmouse);
1890 	}
1891 
1892 	return retval;
1893 }
1894 
1895 #else /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1896 
1897 int synaptics_init(struct psmouse *psmouse)
1898 {
1899 	return -ENOSYS;
1900 }
1901 
1902 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1903