xref: /openbmc/linux/drivers/input/mouse/alps.c (revision 8ee90c5c)
1 /*
2  * ALPS touchpad PS/2 mouse driver
3  *
4  * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
5  * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
6  * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
7  * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
8  * Copyright (c) 2009 Sebastian Kapfer <sebastian_kapfer@gmx.net>
9  *
10  * ALPS detection, tap switching and status querying info is taken from
11  * tpconfig utility (by C. Scott Ananian and Bruce Kall).
12  *
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms of the GNU General Public License version 2 as published by
15  * the Free Software Foundation.
16  */
17 
18 #include <linux/slab.h>
19 #include <linux/input.h>
20 #include <linux/input/mt.h>
21 #include <linux/serio.h>
22 #include <linux/libps2.h>
23 #include <linux/dmi.h>
24 
25 #include "psmouse.h"
26 #include "alps.h"
27 
28 /*
29  * Definitions for ALPS version 3 and 4 command mode protocol
30  */
31 #define ALPS_CMD_NIBBLE_10	0x01f2
32 
33 #define ALPS_REG_BASE_RUSHMORE	0xc2c0
34 #define ALPS_REG_BASE_V7	0xc2c0
35 #define ALPS_REG_BASE_PINNACLE	0x0000
36 
37 static const struct alps_nibble_commands alps_v3_nibble_commands[] = {
38 	{ PSMOUSE_CMD_SETPOLL,		0x00 }, /* 0 */
39 	{ PSMOUSE_CMD_RESET_DIS,	0x00 }, /* 1 */
40 	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 2 */
41 	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 3 */
42 	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 4 */
43 	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 5 */
44 	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 6 */
45 	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 7 */
46 	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 8 */
47 	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 9 */
48 	{ ALPS_CMD_NIBBLE_10,		0x00 }, /* a */
49 	{ PSMOUSE_CMD_SETRES,		0x00 }, /* b */
50 	{ PSMOUSE_CMD_SETRES,		0x01 }, /* c */
51 	{ PSMOUSE_CMD_SETRES,		0x02 }, /* d */
52 	{ PSMOUSE_CMD_SETRES,		0x03 }, /* e */
53 	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
54 };
55 
56 static const struct alps_nibble_commands alps_v4_nibble_commands[] = {
57 	{ PSMOUSE_CMD_ENABLE,		0x00 }, /* 0 */
58 	{ PSMOUSE_CMD_RESET_DIS,	0x00 }, /* 1 */
59 	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 2 */
60 	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 3 */
61 	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 4 */
62 	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 5 */
63 	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 6 */
64 	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 7 */
65 	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 8 */
66 	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 9 */
67 	{ ALPS_CMD_NIBBLE_10,		0x00 }, /* a */
68 	{ PSMOUSE_CMD_SETRES,		0x00 }, /* b */
69 	{ PSMOUSE_CMD_SETRES,		0x01 }, /* c */
70 	{ PSMOUSE_CMD_SETRES,		0x02 }, /* d */
71 	{ PSMOUSE_CMD_SETRES,		0x03 }, /* e */
72 	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
73 };
74 
75 static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
76 	{ PSMOUSE_CMD_ENABLE,		0x00 }, /* 0 */
77 	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 1 */
78 	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 2 */
79 	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 3 */
80 	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 4 */
81 	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 5 */
82 	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 6 */
83 	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 7 */
84 	{ PSMOUSE_CMD_GETID,		0x00 }, /* 8 */
85 	{ PSMOUSE_CMD_GETINFO,		0x00 }, /* 9 */
86 	{ PSMOUSE_CMD_SETRES,		0x00 }, /* a */
87 	{ PSMOUSE_CMD_SETRES,		0x01 }, /* b */
88 	{ PSMOUSE_CMD_SETRES,		0x02 }, /* c */
89 	{ PSMOUSE_CMD_SETRES,		0x03 }, /* d */
90 	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* e */
91 	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
92 };
93 
94 
95 #define ALPS_DUALPOINT		0x02	/* touchpad has trackstick */
96 #define ALPS_PASS		0x04	/* device has a pass-through port */
97 
98 #define ALPS_WHEEL		0x08	/* hardware wheel present */
99 #define ALPS_FW_BK_1		0x10	/* front & back buttons present */
100 #define ALPS_FW_BK_2		0x20	/* front & back buttons present */
101 #define ALPS_FOUR_BUTTONS	0x40	/* 4 direction button present */
102 #define ALPS_PS2_INTERLEAVED	0x80	/* 3-byte PS/2 packet interleaved with
103 					   6-byte ALPS packet */
104 #define ALPS_STICK_BITS		0x100	/* separate stick button bits */
105 #define ALPS_BUTTONPAD		0x200	/* device is a clickpad */
106 #define ALPS_DUALPOINT_WITH_PRESSURE	0x400	/* device can report trackpoint pressure */
107 
108 static const struct alps_model_info alps_model_data[] = {
109 	/*
110 	 * XXX This entry is suspicious. First byte has zero lower nibble,
111 	 * which is what a normal mouse would report. Also, the value 0x0e
112 	 * isn't valid per PS/2 spec.
113 	 */
114 	{ { 0x20, 0x02, 0x0e }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
115 
116 	{ { 0x22, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
117 	{ { 0x22, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D600 */
118 	{ { 0x32, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Toshiba Salellite Pro M10 */
119 	{ { 0x33, 0x02, 0x0a }, { ALPS_PROTO_V1, 0x88, 0xf8, 0 } },				/* UMAX-530T */
120 	{ { 0x52, 0x01, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff,
121 		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Toshiba Tecra A11-11L */
122 	{ { 0x53, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
123 	{ { 0x53, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
124 	{ { 0x60, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },				/* HP ze1115 */
125 	{ { 0x62, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xcf, 0xcf,
126 		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
127 	{ { 0x63, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
128 	{ { 0x63, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
129 	{ { 0x63, 0x02, 0x28 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },			/* Fujitsu Siemens S6010 */
130 	{ { 0x63, 0x02, 0x3c }, { ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL } },			/* Toshiba Satellite S2400-103 */
131 	{ { 0x63, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 } },			/* NEC Versa L320 */
132 	{ { 0x63, 0x02, 0x64 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
133 	{ { 0x63, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D800 */
134 	{ { 0x73, 0x00, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT } },		/* ThinkPad R61 8918-5QG */
135 	{ { 0x73, 0x00, 0x14 }, { ALPS_PROTO_V6, 0xff, 0xff, ALPS_DUALPOINT } },		/* Dell XT2 */
136 	{ { 0x73, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
137 	{ { 0x73, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },			/* Ahtec Laptop */
138 	{ { 0x73, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS } },		/* Dell Vostro 1400 */
139 };
140 
141 static const struct alps_protocol_info alps_v3_protocol_data = {
142 	ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT
143 };
144 
145 static const struct alps_protocol_info alps_v3_rushmore_data = {
146 	ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT
147 };
148 
149 static const struct alps_protocol_info alps_v4_protocol_data = {
150 	ALPS_PROTO_V4, 0x8f, 0x8f, 0
151 };
152 
153 static const struct alps_protocol_info alps_v5_protocol_data = {
154 	ALPS_PROTO_V5, 0xc8, 0xd8, 0
155 };
156 
157 static const struct alps_protocol_info alps_v7_protocol_data = {
158 	ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT
159 };
160 
161 static const struct alps_protocol_info alps_v8_protocol_data = {
162 	ALPS_PROTO_V8, 0x18, 0x18, 0
163 };
164 
165 static const struct alps_protocol_info alps_v9_protocol_data = {
166 	ALPS_PROTO_V9, 0xc8, 0xc8, 0
167 };
168 
169 /*
170  * Some v2 models report the stick buttons in separate bits
171  */
172 static const struct dmi_system_id alps_dmi_has_separate_stick_buttons[] = {
173 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
174 	{
175 		/* Extrapolated from other entries */
176 		.matches = {
177 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
178 			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D420"),
179 		},
180 	},
181 	{
182 		/* Reported-by: Hans de Bruin <jmdebruin@xmsnet.nl> */
183 		.matches = {
184 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
185 			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D430"),
186 		},
187 	},
188 	{
189 		/* Reported-by: Hans de Goede <hdegoede@redhat.com> */
190 		.matches = {
191 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
192 			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D620"),
193 		},
194 	},
195 	{
196 		/* Extrapolated from other entries */
197 		.matches = {
198 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
199 			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D630"),
200 		},
201 	},
202 #endif
203 	{ }
204 };
205 
206 static void alps_set_abs_params_st(struct alps_data *priv,
207 				   struct input_dev *dev1);
208 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
209 					struct input_dev *dev1);
210 static void alps_set_abs_params_v7(struct alps_data *priv,
211 				   struct input_dev *dev1);
212 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
213 				       struct input_dev *dev1);
214 
215 /* Packet formats are described in Documentation/input/alps.txt */
216 
217 static bool alps_is_valid_first_byte(struct alps_data *priv,
218 				     unsigned char data)
219 {
220 	return (data & priv->mask0) == priv->byte0;
221 }
222 
223 static void alps_report_buttons(struct input_dev *dev1, struct input_dev *dev2,
224 				int left, int right, int middle)
225 {
226 	struct input_dev *dev;
227 
228 	/*
229 	 * If shared button has already been reported on the
230 	 * other device (dev2) then this event should be also
231 	 * sent through that device.
232 	 */
233 	dev = (dev2 && test_bit(BTN_LEFT, dev2->key)) ? dev2 : dev1;
234 	input_report_key(dev, BTN_LEFT, left);
235 
236 	dev = (dev2 && test_bit(BTN_RIGHT, dev2->key)) ? dev2 : dev1;
237 	input_report_key(dev, BTN_RIGHT, right);
238 
239 	dev = (dev2 && test_bit(BTN_MIDDLE, dev2->key)) ? dev2 : dev1;
240 	input_report_key(dev, BTN_MIDDLE, middle);
241 
242 	/*
243 	 * Sync the _other_ device now, we'll do the first
244 	 * device later once we report the rest of the events.
245 	 */
246 	if (dev2)
247 		input_sync(dev2);
248 }
249 
250 static void alps_process_packet_v1_v2(struct psmouse *psmouse)
251 {
252 	struct alps_data *priv = psmouse->private;
253 	unsigned char *packet = psmouse->packet;
254 	struct input_dev *dev = psmouse->dev;
255 	struct input_dev *dev2 = priv->dev2;
256 	int x, y, z, ges, fin, left, right, middle;
257 	int back = 0, forward = 0;
258 
259 	if (priv->proto_version == ALPS_PROTO_V1) {
260 		left = packet[2] & 0x10;
261 		right = packet[2] & 0x08;
262 		middle = 0;
263 		x = packet[1] | ((packet[0] & 0x07) << 7);
264 		y = packet[4] | ((packet[3] & 0x07) << 7);
265 		z = packet[5];
266 	} else {
267 		left = packet[3] & 1;
268 		right = packet[3] & 2;
269 		middle = packet[3] & 4;
270 		x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
271 		y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
272 		z = packet[5];
273 	}
274 
275 	if (priv->flags & ALPS_FW_BK_1) {
276 		back = packet[0] & 0x10;
277 		forward = packet[2] & 4;
278 	}
279 
280 	if (priv->flags & ALPS_FW_BK_2) {
281 		back = packet[3] & 4;
282 		forward = packet[2] & 4;
283 		if ((middle = forward && back))
284 			forward = back = 0;
285 	}
286 
287 	ges = packet[2] & 1;
288 	fin = packet[2] & 2;
289 
290 	if ((priv->flags & ALPS_DUALPOINT) && z == 127) {
291 		input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
292 		input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
293 
294 		alps_report_buttons(dev2, dev, left, right, middle);
295 
296 		input_sync(dev2);
297 		return;
298 	}
299 
300 	/* Some models have separate stick button bits */
301 	if (priv->flags & ALPS_STICK_BITS) {
302 		left |= packet[0] & 1;
303 		right |= packet[0] & 2;
304 		middle |= packet[0] & 4;
305 	}
306 
307 	alps_report_buttons(dev, dev2, left, right, middle);
308 
309 	/* Convert hardware tap to a reasonable Z value */
310 	if (ges && !fin)
311 		z = 40;
312 
313 	/*
314 	 * A "tap and drag" operation is reported by the hardware as a transition
315 	 * from (!fin && ges) to (fin && ges). This should be translated to the
316 	 * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
317 	 */
318 	if (ges && fin && !priv->prev_fin) {
319 		input_report_abs(dev, ABS_X, x);
320 		input_report_abs(dev, ABS_Y, y);
321 		input_report_abs(dev, ABS_PRESSURE, 0);
322 		input_report_key(dev, BTN_TOOL_FINGER, 0);
323 		input_sync(dev);
324 	}
325 	priv->prev_fin = fin;
326 
327 	if (z > 30)
328 		input_report_key(dev, BTN_TOUCH, 1);
329 	if (z < 25)
330 		input_report_key(dev, BTN_TOUCH, 0);
331 
332 	if (z > 0) {
333 		input_report_abs(dev, ABS_X, x);
334 		input_report_abs(dev, ABS_Y, y);
335 	}
336 
337 	input_report_abs(dev, ABS_PRESSURE, z);
338 	input_report_key(dev, BTN_TOOL_FINGER, z > 0);
339 
340 	if (priv->flags & ALPS_WHEEL)
341 		input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
342 
343 	if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
344 		input_report_key(dev, BTN_FORWARD, forward);
345 		input_report_key(dev, BTN_BACK, back);
346 	}
347 
348 	if (priv->flags & ALPS_FOUR_BUTTONS) {
349 		input_report_key(dev, BTN_0, packet[2] & 4);
350 		input_report_key(dev, BTN_1, packet[0] & 0x10);
351 		input_report_key(dev, BTN_2, packet[3] & 4);
352 		input_report_key(dev, BTN_3, packet[0] & 0x20);
353 	}
354 
355 	input_sync(dev);
356 }
357 
358 static void alps_get_bitmap_points(unsigned int map,
359 				   struct alps_bitmap_point *low,
360 				   struct alps_bitmap_point *high,
361 				   int *fingers)
362 {
363 	struct alps_bitmap_point *point;
364 	int i, bit, prev_bit = 0;
365 
366 	point = low;
367 	for (i = 0; map != 0; i++, map >>= 1) {
368 		bit = map & 1;
369 		if (bit) {
370 			if (!prev_bit) {
371 				point->start_bit = i;
372 				point->num_bits = 0;
373 				(*fingers)++;
374 			}
375 			point->num_bits++;
376 		} else {
377 			if (prev_bit)
378 				point = high;
379 		}
380 		prev_bit = bit;
381 	}
382 }
383 
384 /*
385  * Process bitmap data from semi-mt protocols. Returns the number of
386  * fingers detected. A return value of 0 means at least one of the
387  * bitmaps was empty.
388  *
389  * The bitmaps don't have enough data to track fingers, so this function
390  * only generates points representing a bounding box of all contacts.
391  * These points are returned in fields->mt when the return value
392  * is greater than 0.
393  */
394 static int alps_process_bitmap(struct alps_data *priv,
395 			       struct alps_fields *fields)
396 {
397 	int i, fingers_x = 0, fingers_y = 0, fingers, closest;
398 	struct alps_bitmap_point x_low = {0,}, x_high = {0,};
399 	struct alps_bitmap_point y_low = {0,}, y_high = {0,};
400 	struct input_mt_pos corner[4];
401 
402 	if (!fields->x_map || !fields->y_map)
403 		return 0;
404 
405 	alps_get_bitmap_points(fields->x_map, &x_low, &x_high, &fingers_x);
406 	alps_get_bitmap_points(fields->y_map, &y_low, &y_high, &fingers_y);
407 
408 	/*
409 	 * Fingers can overlap, so we use the maximum count of fingers
410 	 * on either axis as the finger count.
411 	 */
412 	fingers = max(fingers_x, fingers_y);
413 
414 	/*
415 	 * If an axis reports only a single contact, we have overlapping or
416 	 * adjacent fingers. Divide the single contact between the two points.
417 	 */
418 	if (fingers_x == 1) {
419 		i = (x_low.num_bits - 1) / 2;
420 		x_low.num_bits = x_low.num_bits - i;
421 		x_high.start_bit = x_low.start_bit + i;
422 		x_high.num_bits = max(i, 1);
423 	}
424 	if (fingers_y == 1) {
425 		i = (y_low.num_bits - 1) / 2;
426 		y_low.num_bits = y_low.num_bits - i;
427 		y_high.start_bit = y_low.start_bit + i;
428 		y_high.num_bits = max(i, 1);
429 	}
430 
431 	/* top-left corner */
432 	corner[0].x =
433 		(priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
434 		(2 * (priv->x_bits - 1));
435 	corner[0].y =
436 		(priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
437 		(2 * (priv->y_bits - 1));
438 
439 	/* top-right corner */
440 	corner[1].x =
441 		(priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
442 		(2 * (priv->x_bits - 1));
443 	corner[1].y =
444 		(priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
445 		(2 * (priv->y_bits - 1));
446 
447 	/* bottom-right corner */
448 	corner[2].x =
449 		(priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
450 		(2 * (priv->x_bits - 1));
451 	corner[2].y =
452 		(priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
453 		(2 * (priv->y_bits - 1));
454 
455 	/* bottom-left corner */
456 	corner[3].x =
457 		(priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
458 		(2 * (priv->x_bits - 1));
459 	corner[3].y =
460 		(priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
461 		(2 * (priv->y_bits - 1));
462 
463 	/* x-bitmap order is reversed on v5 touchpads  */
464 	if (priv->proto_version == ALPS_PROTO_V5) {
465 		for (i = 0; i < 4; i++)
466 			corner[i].x = priv->x_max - corner[i].x;
467 	}
468 
469 	/* y-bitmap order is reversed on v3 and v4 touchpads  */
470 	if (priv->proto_version == ALPS_PROTO_V3 ||
471 	    priv->proto_version == ALPS_PROTO_V4) {
472 		for (i = 0; i < 4; i++)
473 			corner[i].y = priv->y_max - corner[i].y;
474 	}
475 
476 	/*
477 	 * We only select a corner for the second touch once per 2 finger
478 	 * touch sequence to avoid the chosen corner (and thus the coordinates)
479 	 * jumping around when the first touch is in the middle.
480 	 */
481 	if (priv->second_touch == -1) {
482 		/* Find corner closest to our st coordinates */
483 		closest = 0x7fffffff;
484 		for (i = 0; i < 4; i++) {
485 			int dx = fields->st.x - corner[i].x;
486 			int dy = fields->st.y - corner[i].y;
487 			int distance = dx * dx + dy * dy;
488 
489 			if (distance < closest) {
490 				priv->second_touch = i;
491 				closest = distance;
492 			}
493 		}
494 		/* And select the opposite corner to use for the 2nd touch */
495 		priv->second_touch = (priv->second_touch + 2) % 4;
496 	}
497 
498 	fields->mt[0] = fields->st;
499 	fields->mt[1] = corner[priv->second_touch];
500 
501 	return fingers;
502 }
503 
504 static void alps_set_slot(struct input_dev *dev, int slot, int x, int y)
505 {
506 	input_mt_slot(dev, slot);
507 	input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
508 	input_report_abs(dev, ABS_MT_POSITION_X, x);
509 	input_report_abs(dev, ABS_MT_POSITION_Y, y);
510 }
511 
512 static void alps_report_mt_data(struct psmouse *psmouse, int n)
513 {
514 	struct alps_data *priv = psmouse->private;
515 	struct input_dev *dev = psmouse->dev;
516 	struct alps_fields *f = &priv->f;
517 	int i, slot[MAX_TOUCHES];
518 
519 	input_mt_assign_slots(dev, slot, f->mt, n, 0);
520 	for (i = 0; i < n; i++)
521 		alps_set_slot(dev, slot[i], f->mt[i].x, f->mt[i].y);
522 
523 	input_mt_sync_frame(dev);
524 }
525 
526 static void alps_report_semi_mt_data(struct psmouse *psmouse, int fingers)
527 {
528 	struct alps_data *priv = psmouse->private;
529 	struct input_dev *dev = psmouse->dev;
530 	struct alps_fields *f = &priv->f;
531 
532 	/* Use st data when we don't have mt data */
533 	if (fingers < 2) {
534 		f->mt[0].x = f->st.x;
535 		f->mt[0].y = f->st.y;
536 		fingers = f->pressure > 0 ? 1 : 0;
537 		priv->second_touch = -1;
538 	}
539 
540 	if (fingers >= 1)
541 		alps_set_slot(dev, 0, f->mt[0].x, f->mt[0].y);
542 	if (fingers >= 2)
543 		alps_set_slot(dev, 1, f->mt[1].x, f->mt[1].y);
544 	input_mt_sync_frame(dev);
545 
546 	input_mt_report_finger_count(dev, fingers);
547 
548 	input_report_key(dev, BTN_LEFT, f->left);
549 	input_report_key(dev, BTN_RIGHT, f->right);
550 	input_report_key(dev, BTN_MIDDLE, f->middle);
551 
552 	input_report_abs(dev, ABS_PRESSURE, f->pressure);
553 
554 	input_sync(dev);
555 }
556 
557 static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
558 {
559 	struct alps_data *priv = psmouse->private;
560 	unsigned char *packet = psmouse->packet;
561 	struct input_dev *dev = priv->dev2;
562 	int x, y, z, left, right, middle;
563 
564 	/* It should be a DualPoint when received trackstick packet */
565 	if (!(priv->flags & ALPS_DUALPOINT)) {
566 		psmouse_warn(psmouse,
567 			     "Rejected trackstick packet from non DualPoint device");
568 		return;
569 	}
570 
571 	/* Sanity check packet */
572 	if (!(packet[0] & 0x40)) {
573 		psmouse_dbg(psmouse, "Bad trackstick packet, discarding\n");
574 		return;
575 	}
576 
577 	/*
578 	 * There's a special packet that seems to indicate the end
579 	 * of a stream of trackstick data. Filter these out.
580 	 */
581 	if (packet[1] == 0x7f && packet[2] == 0x7f && packet[4] == 0x7f)
582 		return;
583 
584 	x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
585 	y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
586 	z = (packet[4] & 0x7c) >> 2;
587 
588 	/*
589 	 * The x and y values tend to be quite large, and when used
590 	 * alone the trackstick is difficult to use. Scale them down
591 	 * to compensate.
592 	 */
593 	x /= 8;
594 	y /= 8;
595 
596 	input_report_rel(dev, REL_X, x);
597 	input_report_rel(dev, REL_Y, -y);
598 
599 	/*
600 	 * Most ALPS models report the trackstick buttons in the touchpad
601 	 * packets, but a few report them here. No reliable way has been
602 	 * found to differentiate between the models upfront, so we enable
603 	 * the quirk in response to seeing a button press in the trackstick
604 	 * packet.
605 	 */
606 	left = packet[3] & 0x01;
607 	right = packet[3] & 0x02;
608 	middle = packet[3] & 0x04;
609 
610 	if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) &&
611 	    (left || right || middle))
612 		priv->quirks |= ALPS_QUIRK_TRACKSTICK_BUTTONS;
613 
614 	if (priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) {
615 		input_report_key(dev, BTN_LEFT, left);
616 		input_report_key(dev, BTN_RIGHT, right);
617 		input_report_key(dev, BTN_MIDDLE, middle);
618 	}
619 
620 	input_sync(dev);
621 	return;
622 }
623 
624 static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
625 {
626 	f->left = !!(p[3] & 0x01);
627 	f->right = !!(p[3] & 0x02);
628 	f->middle = !!(p[3] & 0x04);
629 
630 	f->ts_left = !!(p[3] & 0x10);
631 	f->ts_right = !!(p[3] & 0x20);
632 	f->ts_middle = !!(p[3] & 0x40);
633 }
634 
635 static int alps_decode_pinnacle(struct alps_fields *f, unsigned char *p,
636 				 struct psmouse *psmouse)
637 {
638 	f->first_mp = !!(p[4] & 0x40);
639 	f->is_mp = !!(p[0] & 0x40);
640 
641 	if (f->is_mp) {
642 		f->fingers = (p[5] & 0x3) + 1;
643 		f->x_map = ((p[4] & 0x7e) << 8) |
644 			   ((p[1] & 0x7f) << 2) |
645 			   ((p[0] & 0x30) >> 4);
646 		f->y_map = ((p[3] & 0x70) << 4) |
647 			   ((p[2] & 0x7f) << 1) |
648 			   (p[4] & 0x01);
649 	} else {
650 		f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
651 		       ((p[0] & 0x30) >> 4);
652 		f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
653 		f->pressure = p[5] & 0x7f;
654 
655 		alps_decode_buttons_v3(f, p);
656 	}
657 
658 	return 0;
659 }
660 
661 static int alps_decode_rushmore(struct alps_fields *f, unsigned char *p,
662 				 struct psmouse *psmouse)
663 {
664 	f->first_mp = !!(p[4] & 0x40);
665 	f->is_mp = !!(p[5] & 0x40);
666 
667 	if (f->is_mp) {
668 		f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1;
669 		f->x_map = ((p[5] & 0x10) << 11) |
670 			   ((p[4] & 0x7e) << 8) |
671 			   ((p[1] & 0x7f) << 2) |
672 			   ((p[0] & 0x30) >> 4);
673 		f->y_map = ((p[5] & 0x20) << 6) |
674 			   ((p[3] & 0x70) << 4) |
675 			   ((p[2] & 0x7f) << 1) |
676 			   (p[4] & 0x01);
677 	} else {
678 		f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
679 		       ((p[0] & 0x30) >> 4);
680 		f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
681 		f->pressure = p[5] & 0x7f;
682 
683 		alps_decode_buttons_v3(f, p);
684 	}
685 
686 	return 0;
687 }
688 
689 static int alps_decode_dolphin(struct alps_fields *f, unsigned char *p,
690 				struct psmouse *psmouse)
691 {
692 	u64 palm_data = 0;
693 	struct alps_data *priv = psmouse->private;
694 
695 	f->first_mp = !!(p[0] & 0x02);
696 	f->is_mp = !!(p[0] & 0x20);
697 
698 	if (!f->is_mp) {
699 		f->st.x = ((p[1] & 0x7f) | ((p[4] & 0x0f) << 7));
700 		f->st.y = ((p[2] & 0x7f) | ((p[4] & 0xf0) << 3));
701 		f->pressure = (p[0] & 4) ? 0 : p[5] & 0x7f;
702 		alps_decode_buttons_v3(f, p);
703 	} else {
704 		f->fingers = ((p[0] & 0x6) >> 1 |
705 		     (p[0] & 0x10) >> 2);
706 
707 		palm_data = (p[1] & 0x7f) |
708 			    ((p[2] & 0x7f) << 7) |
709 			    ((p[4] & 0x7f) << 14) |
710 			    ((p[5] & 0x7f) << 21) |
711 			    ((p[3] & 0x07) << 28) |
712 			    (((u64)p[3] & 0x70) << 27) |
713 			    (((u64)p[0] & 0x01) << 34);
714 
715 		/* Y-profile is stored in P(0) to p(n-1), n = y_bits; */
716 		f->y_map = palm_data & (BIT(priv->y_bits) - 1);
717 
718 		/* X-profile is stored in p(n) to p(n+m-1), m = x_bits; */
719 		f->x_map = (palm_data >> priv->y_bits) &
720 			   (BIT(priv->x_bits) - 1);
721 	}
722 
723 	return 0;
724 }
725 
726 static void alps_process_touchpad_packet_v3_v5(struct psmouse *psmouse)
727 {
728 	struct alps_data *priv = psmouse->private;
729 	unsigned char *packet = psmouse->packet;
730 	struct input_dev *dev2 = priv->dev2;
731 	struct alps_fields *f = &priv->f;
732 	int fingers = 0;
733 
734 	memset(f, 0, sizeof(*f));
735 
736 	priv->decode_fields(f, packet, psmouse);
737 
738 	/*
739 	 * There's no single feature of touchpad position and bitmap packets
740 	 * that can be used to distinguish between them. We rely on the fact
741 	 * that a bitmap packet should always follow a position packet with
742 	 * bit 6 of packet[4] set.
743 	 */
744 	if (priv->multi_packet) {
745 		/*
746 		 * Sometimes a position packet will indicate a multi-packet
747 		 * sequence, but then what follows is another position
748 		 * packet. Check for this, and when it happens process the
749 		 * position packet as usual.
750 		 */
751 		if (f->is_mp) {
752 			fingers = f->fingers;
753 			/*
754 			 * Bitmap processing uses position packet's coordinate
755 			 * data, so we need to do decode it first.
756 			 */
757 			priv->decode_fields(f, priv->multi_data, psmouse);
758 			if (alps_process_bitmap(priv, f) == 0)
759 				fingers = 0; /* Use st data */
760 		} else {
761 			priv->multi_packet = 0;
762 		}
763 	}
764 
765 	/*
766 	 * Bit 6 of byte 0 is not usually set in position packets. The only
767 	 * times it seems to be set is in situations where the data is
768 	 * suspect anyway, e.g. a palm resting flat on the touchpad. Given
769 	 * this combined with the fact that this bit is useful for filtering
770 	 * out misidentified bitmap packets, we reject anything with this
771 	 * bit set.
772 	 */
773 	if (f->is_mp)
774 		return;
775 
776 	if (!priv->multi_packet && f->first_mp) {
777 		priv->multi_packet = 1;
778 		memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
779 		return;
780 	}
781 
782 	priv->multi_packet = 0;
783 
784 	/*
785 	 * Sometimes the hardware sends a single packet with z = 0
786 	 * in the middle of a stream. Real releases generate packets
787 	 * with x, y, and z all zero, so these seem to be flukes.
788 	 * Ignore them.
789 	 */
790 	if (f->st.x && f->st.y && !f->pressure)
791 		return;
792 
793 	alps_report_semi_mt_data(psmouse, fingers);
794 
795 	if ((priv->flags & ALPS_DUALPOINT) &&
796 	    !(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
797 		input_report_key(dev2, BTN_LEFT, f->ts_left);
798 		input_report_key(dev2, BTN_RIGHT, f->ts_right);
799 		input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
800 		input_sync(dev2);
801 	}
802 }
803 
804 static void alps_process_packet_v3(struct psmouse *psmouse)
805 {
806 	unsigned char *packet = psmouse->packet;
807 
808 	/*
809 	 * v3 protocol packets come in three types, two representing
810 	 * touchpad data and one representing trackstick data.
811 	 * Trackstick packets seem to be distinguished by always
812 	 * having 0x3f in the last byte. This value has never been
813 	 * observed in the last byte of either of the other types
814 	 * of packets.
815 	 */
816 	if (packet[5] == 0x3f) {
817 		alps_process_trackstick_packet_v3(psmouse);
818 		return;
819 	}
820 
821 	alps_process_touchpad_packet_v3_v5(psmouse);
822 }
823 
824 static void alps_process_packet_v6(struct psmouse *psmouse)
825 {
826 	struct alps_data *priv = psmouse->private;
827 	unsigned char *packet = psmouse->packet;
828 	struct input_dev *dev = psmouse->dev;
829 	struct input_dev *dev2 = priv->dev2;
830 	int x, y, z, left, right, middle;
831 
832 	/*
833 	 * We can use Byte5 to distinguish if the packet is from Touchpad
834 	 * or Trackpoint.
835 	 * Touchpad:	0 - 0x7E
836 	 * Trackpoint:	0x7F
837 	 */
838 	if (packet[5] == 0x7F) {
839 		/* It should be a DualPoint when received Trackpoint packet */
840 		if (!(priv->flags & ALPS_DUALPOINT)) {
841 			psmouse_warn(psmouse,
842 				     "Rejected trackstick packet from non DualPoint device");
843 			return;
844 		}
845 
846 		/* Trackpoint packet */
847 		x = packet[1] | ((packet[3] & 0x20) << 2);
848 		y = packet[2] | ((packet[3] & 0x40) << 1);
849 		z = packet[4];
850 		left = packet[3] & 0x01;
851 		right = packet[3] & 0x02;
852 		middle = packet[3] & 0x04;
853 
854 		/* To prevent the cursor jump when finger lifted */
855 		if (x == 0x7F && y == 0x7F && z == 0x7F)
856 			x = y = z = 0;
857 
858 		/* Divide 4 since trackpoint's speed is too fast */
859 		input_report_rel(dev2, REL_X, (char)x / 4);
860 		input_report_rel(dev2, REL_Y, -((char)y / 4));
861 
862 		input_report_key(dev2, BTN_LEFT, left);
863 		input_report_key(dev2, BTN_RIGHT, right);
864 		input_report_key(dev2, BTN_MIDDLE, middle);
865 
866 		input_sync(dev2);
867 		return;
868 	}
869 
870 	/* Touchpad packet */
871 	x = packet[1] | ((packet[3] & 0x78) << 4);
872 	y = packet[2] | ((packet[4] & 0x78) << 4);
873 	z = packet[5];
874 	left = packet[3] & 0x01;
875 	right = packet[3] & 0x02;
876 
877 	if (z > 30)
878 		input_report_key(dev, BTN_TOUCH, 1);
879 	if (z < 25)
880 		input_report_key(dev, BTN_TOUCH, 0);
881 
882 	if (z > 0) {
883 		input_report_abs(dev, ABS_X, x);
884 		input_report_abs(dev, ABS_Y, y);
885 	}
886 
887 	input_report_abs(dev, ABS_PRESSURE, z);
888 	input_report_key(dev, BTN_TOOL_FINGER, z > 0);
889 
890 	/* v6 touchpad does not have middle button */
891 	input_report_key(dev, BTN_LEFT, left);
892 	input_report_key(dev, BTN_RIGHT, right);
893 
894 	input_sync(dev);
895 }
896 
897 static void alps_process_packet_v4(struct psmouse *psmouse)
898 {
899 	struct alps_data *priv = psmouse->private;
900 	unsigned char *packet = psmouse->packet;
901 	struct alps_fields *f = &priv->f;
902 	int offset;
903 
904 	/*
905 	 * v4 has a 6-byte encoding for bitmap data, but this data is
906 	 * broken up between 3 normal packets. Use priv->multi_packet to
907 	 * track our position in the bitmap packet.
908 	 */
909 	if (packet[6] & 0x40) {
910 		/* sync, reset position */
911 		priv->multi_packet = 0;
912 	}
913 
914 	if (WARN_ON_ONCE(priv->multi_packet > 2))
915 		return;
916 
917 	offset = 2 * priv->multi_packet;
918 	priv->multi_data[offset] = packet[6];
919 	priv->multi_data[offset + 1] = packet[7];
920 
921 	f->left = !!(packet[4] & 0x01);
922 	f->right = !!(packet[4] & 0x02);
923 
924 	f->st.x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
925 		  ((packet[0] & 0x30) >> 4);
926 	f->st.y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
927 	f->pressure = packet[5] & 0x7f;
928 
929 	if (++priv->multi_packet > 2) {
930 		priv->multi_packet = 0;
931 
932 		f->x_map = ((priv->multi_data[2] & 0x1f) << 10) |
933 			   ((priv->multi_data[3] & 0x60) << 3) |
934 			   ((priv->multi_data[0] & 0x3f) << 2) |
935 			   ((priv->multi_data[1] & 0x60) >> 5);
936 		f->y_map = ((priv->multi_data[5] & 0x01) << 10) |
937 			   ((priv->multi_data[3] & 0x1f) << 5) |
938 			    (priv->multi_data[1] & 0x1f);
939 
940 		f->fingers = alps_process_bitmap(priv, f);
941 	}
942 
943 	alps_report_semi_mt_data(psmouse, f->fingers);
944 }
945 
946 static bool alps_is_valid_package_v7(struct psmouse *psmouse)
947 {
948 	switch (psmouse->pktcnt) {
949 	case 3:
950 		return (psmouse->packet[2] & 0x40) == 0x40;
951 	case 4:
952 		return (psmouse->packet[3] & 0x48) == 0x48;
953 	case 6:
954 		return (psmouse->packet[5] & 0x40) == 0x00;
955 	}
956 	return true;
957 }
958 
959 static unsigned char alps_get_packet_id_v7(char *byte)
960 {
961 	unsigned char packet_id;
962 
963 	if (byte[4] & 0x40)
964 		packet_id = V7_PACKET_ID_TWO;
965 	else if (byte[4] & 0x01)
966 		packet_id = V7_PACKET_ID_MULTI;
967 	else if ((byte[0] & 0x10) && !(byte[4] & 0x43))
968 		packet_id = V7_PACKET_ID_NEW;
969 	else if (byte[1] == 0x00 && byte[4] == 0x00)
970 		packet_id = V7_PACKET_ID_IDLE;
971 	else
972 		packet_id = V7_PACKET_ID_UNKNOWN;
973 
974 	return packet_id;
975 }
976 
977 static void alps_get_finger_coordinate_v7(struct input_mt_pos *mt,
978 					  unsigned char *pkt,
979 					  unsigned char pkt_id)
980 {
981 	mt[0].x = ((pkt[2] & 0x80) << 4);
982 	mt[0].x |= ((pkt[2] & 0x3F) << 5);
983 	mt[0].x |= ((pkt[3] & 0x30) >> 1);
984 	mt[0].x |= (pkt[3] & 0x07);
985 	mt[0].y = (pkt[1] << 3) | (pkt[0] & 0x07);
986 
987 	mt[1].x = ((pkt[3] & 0x80) << 4);
988 	mt[1].x |= ((pkt[4] & 0x80) << 3);
989 	mt[1].x |= ((pkt[4] & 0x3F) << 4);
990 	mt[1].y = ((pkt[5] & 0x80) << 3);
991 	mt[1].y |= ((pkt[5] & 0x3F) << 4);
992 
993 	switch (pkt_id) {
994 	case V7_PACKET_ID_TWO:
995 		mt[1].x &= ~0x000F;
996 		mt[1].y |= 0x000F;
997 		/* Detect false-postive touches where x & y report max value */
998 		if (mt[1].y == 0x7ff && mt[1].x == 0xff0) {
999 			mt[1].x = 0;
1000 			/* y gets set to 0 at the end of this function */
1001 		}
1002 		break;
1003 
1004 	case V7_PACKET_ID_MULTI:
1005 		mt[1].x &= ~0x003F;
1006 		mt[1].y &= ~0x0020;
1007 		mt[1].y |= ((pkt[4] & 0x02) << 4);
1008 		mt[1].y |= 0x001F;
1009 		break;
1010 
1011 	case V7_PACKET_ID_NEW:
1012 		mt[1].x &= ~0x003F;
1013 		mt[1].x |= (pkt[0] & 0x20);
1014 		mt[1].y |= 0x000F;
1015 		break;
1016 	}
1017 
1018 	mt[0].y = 0x7FF - mt[0].y;
1019 	mt[1].y = 0x7FF - mt[1].y;
1020 }
1021 
1022 static int alps_get_mt_count(struct input_mt_pos *mt)
1023 {
1024 	int i, fingers = 0;
1025 
1026 	for (i = 0; i < MAX_TOUCHES; i++) {
1027 		if (mt[i].x != 0 || mt[i].y != 0)
1028 			fingers++;
1029 	}
1030 
1031 	return fingers;
1032 }
1033 
1034 static int alps_decode_packet_v7(struct alps_fields *f,
1035 				  unsigned char *p,
1036 				  struct psmouse *psmouse)
1037 {
1038 	struct alps_data *priv = psmouse->private;
1039 	unsigned char pkt_id;
1040 
1041 	pkt_id = alps_get_packet_id_v7(p);
1042 	if (pkt_id == V7_PACKET_ID_IDLE)
1043 		return 0;
1044 	if (pkt_id == V7_PACKET_ID_UNKNOWN)
1045 		return -1;
1046 	/*
1047 	 * NEW packets are send to indicate a discontinuity in the finger
1048 	 * coordinate reporting. Specifically a finger may have moved from
1049 	 * slot 0 to 1 or vice versa. INPUT_MT_TRACK takes care of this for
1050 	 * us.
1051 	 *
1052 	 * NEW packets have 3 problems:
1053 	 * 1) They do not contain middle / right button info (on non clickpads)
1054 	 *    this can be worked around by preserving the old button state
1055 	 * 2) They do not contain an accurate fingercount, and they are
1056 	 *    typically send when the number of fingers changes. We cannot use
1057 	 *    the old finger count as that may mismatch with the amount of
1058 	 *    touch coordinates we've available in the NEW packet
1059 	 * 3) Their x data for the second touch is inaccurate leading to
1060 	 *    a possible jump of the x coordinate by 16 units when the first
1061 	 *    non NEW packet comes in
1062 	 * Since problems 2 & 3 cannot be worked around, just ignore them.
1063 	 */
1064 	if (pkt_id == V7_PACKET_ID_NEW)
1065 		return 1;
1066 
1067 	alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
1068 
1069 	if (pkt_id == V7_PACKET_ID_TWO)
1070 		f->fingers = alps_get_mt_count(f->mt);
1071 	else /* pkt_id == V7_PACKET_ID_MULTI */
1072 		f->fingers = 3 + (p[5] & 0x03);
1073 
1074 	f->left = (p[0] & 0x80) >> 7;
1075 	if (priv->flags & ALPS_BUTTONPAD) {
1076 		if (p[0] & 0x20)
1077 			f->fingers++;
1078 		if (p[0] & 0x10)
1079 			f->fingers++;
1080 	} else {
1081 		f->right = (p[0] & 0x20) >> 5;
1082 		f->middle = (p[0] & 0x10) >> 4;
1083 	}
1084 
1085 	/* Sometimes a single touch is reported in mt[1] rather then mt[0] */
1086 	if (f->fingers == 1 && f->mt[0].x == 0 && f->mt[0].y == 0) {
1087 		f->mt[0].x = f->mt[1].x;
1088 		f->mt[0].y = f->mt[1].y;
1089 		f->mt[1].x = 0;
1090 		f->mt[1].y = 0;
1091 	}
1092 
1093 	return 0;
1094 }
1095 
1096 static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
1097 {
1098 	struct alps_data *priv = psmouse->private;
1099 	unsigned char *packet = psmouse->packet;
1100 	struct input_dev *dev2 = priv->dev2;
1101 	int x, y, z, left, right, middle;
1102 
1103 	/* It should be a DualPoint when received trackstick packet */
1104 	if (!(priv->flags & ALPS_DUALPOINT)) {
1105 		psmouse_warn(psmouse,
1106 			     "Rejected trackstick packet from non DualPoint device");
1107 		return;
1108 	}
1109 
1110 	x = ((packet[2] & 0xbf)) | ((packet[3] & 0x10) << 2);
1111 	y = (packet[3] & 0x07) | (packet[4] & 0xb8) |
1112 	    ((packet[3] & 0x20) << 1);
1113 	z = (packet[5] & 0x3f) | ((packet[3] & 0x80) >> 1);
1114 
1115 	left = (packet[1] & 0x01);
1116 	right = (packet[1] & 0x02) >> 1;
1117 	middle = (packet[1] & 0x04) >> 2;
1118 
1119 	input_report_rel(dev2, REL_X, (char)x);
1120 	input_report_rel(dev2, REL_Y, -((char)y));
1121 
1122 	input_report_key(dev2, BTN_LEFT, left);
1123 	input_report_key(dev2, BTN_RIGHT, right);
1124 	input_report_key(dev2, BTN_MIDDLE, middle);
1125 
1126 	input_sync(dev2);
1127 }
1128 
1129 static void alps_process_touchpad_packet_v7(struct psmouse *psmouse)
1130 {
1131 	struct alps_data *priv = psmouse->private;
1132 	struct input_dev *dev = psmouse->dev;
1133 	struct alps_fields *f = &priv->f;
1134 
1135 	memset(f, 0, sizeof(*f));
1136 
1137 	if (priv->decode_fields(f, psmouse->packet, psmouse))
1138 		return;
1139 
1140 	alps_report_mt_data(psmouse, alps_get_mt_count(f->mt));
1141 
1142 	input_mt_report_finger_count(dev, f->fingers);
1143 
1144 	input_report_key(dev, BTN_LEFT, f->left);
1145 	input_report_key(dev, BTN_RIGHT, f->right);
1146 	input_report_key(dev, BTN_MIDDLE, f->middle);
1147 
1148 	input_sync(dev);
1149 }
1150 
1151 static void alps_process_packet_v7(struct psmouse *psmouse)
1152 {
1153 	unsigned char *packet = psmouse->packet;
1154 
1155 	if (packet[0] == 0x48 && (packet[4] & 0x47) == 0x06)
1156 		alps_process_trackstick_packet_v7(psmouse);
1157 	else
1158 		alps_process_touchpad_packet_v7(psmouse);
1159 }
1160 
1161 static enum SS4_PACKET_ID alps_get_pkt_id_ss4_v2(unsigned char *byte)
1162 {
1163 	enum SS4_PACKET_ID pkt_id = SS4_PACKET_ID_IDLE;
1164 
1165 	switch (byte[3] & 0x30) {
1166 	case 0x00:
1167 		if (SS4_IS_IDLE_V2(byte)) {
1168 			pkt_id = SS4_PACKET_ID_IDLE;
1169 		} else {
1170 			pkt_id = SS4_PACKET_ID_ONE;
1171 		}
1172 		break;
1173 	case 0x10:
1174 		/* two-finger finger positions */
1175 		pkt_id = SS4_PACKET_ID_TWO;
1176 		break;
1177 	case 0x20:
1178 		/* stick pointer */
1179 		pkt_id = SS4_PACKET_ID_STICK;
1180 		break;
1181 	case 0x30:
1182 		/* third and fourth finger positions */
1183 		pkt_id = SS4_PACKET_ID_MULTI;
1184 		break;
1185 	}
1186 
1187 	return pkt_id;
1188 }
1189 
1190 static int alps_decode_ss4_v2(struct alps_fields *f,
1191 			      unsigned char *p, struct psmouse *psmouse)
1192 {
1193 	struct alps_data *priv = psmouse->private;
1194 	enum SS4_PACKET_ID pkt_id;
1195 	unsigned int no_data_x, no_data_y;
1196 
1197 	pkt_id = alps_get_pkt_id_ss4_v2(p);
1198 
1199 	/* Current packet is 1Finger coordinate packet */
1200 	switch (pkt_id) {
1201 	case SS4_PACKET_ID_ONE:
1202 		f->mt[0].x = SS4_1F_X_V2(p);
1203 		f->mt[0].y = SS4_1F_Y_V2(p);
1204 		f->pressure = ((SS4_1F_Z_V2(p)) * 2) & 0x7f;
1205 		/*
1206 		 * When a button is held the device will give us events
1207 		 * with x, y, and pressure of 0. This causes annoying jumps
1208 		 * if a touch is released while the button is held.
1209 		 * Handle this by claiming zero contacts.
1210 		 */
1211 		f->fingers = f->pressure > 0 ? 1 : 0;
1212 		f->first_mp = 0;
1213 		f->is_mp = 0;
1214 		break;
1215 
1216 	case SS4_PACKET_ID_TWO:
1217 		if (priv->flags & ALPS_BUTTONPAD) {
1218 			if (IS_SS4PLUS_DEV(priv->dev_id)) {
1219 				f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
1220 				f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
1221 			} else {
1222 				f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
1223 				f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
1224 			}
1225 			f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
1226 			f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
1227 		} else {
1228 			if (IS_SS4PLUS_DEV(priv->dev_id)) {
1229 				f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
1230 				f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
1231 			} else {
1232 				f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
1233 				f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
1234 			}
1235 			f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
1236 			f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
1237 		}
1238 		f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
1239 
1240 		if (SS4_IS_MF_CONTINUE(p)) {
1241 			f->first_mp = 1;
1242 		} else {
1243 			f->fingers = 2;
1244 			f->first_mp = 0;
1245 		}
1246 		f->is_mp = 0;
1247 
1248 		break;
1249 
1250 	case SS4_PACKET_ID_MULTI:
1251 		if (priv->flags & ALPS_BUTTONPAD) {
1252 			if (IS_SS4PLUS_DEV(priv->dev_id)) {
1253 				f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
1254 				f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
1255 			} else {
1256 				f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
1257 				f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
1258 			}
1259 
1260 			f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
1261 			f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
1262 			no_data_x = SS4_MFPACKET_NO_AX_BL;
1263 			no_data_y = SS4_MFPACKET_NO_AY_BL;
1264 		} else {
1265 			if (IS_SS4PLUS_DEV(priv->dev_id)) {
1266 				f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
1267 				f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
1268 			} else {
1269 				f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
1270 				f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
1271 			}
1272 			f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
1273 			f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
1274 			no_data_x = SS4_MFPACKET_NO_AX;
1275 			no_data_y = SS4_MFPACKET_NO_AY;
1276 		}
1277 
1278 		f->first_mp = 0;
1279 		f->is_mp = 1;
1280 
1281 		if (SS4_IS_5F_DETECTED(p)) {
1282 			f->fingers = 5;
1283 		} else if (f->mt[3].x == no_data_x &&
1284 			     f->mt[3].y == no_data_y) {
1285 			f->mt[3].x = 0;
1286 			f->mt[3].y = 0;
1287 			f->fingers = 3;
1288 		} else {
1289 			f->fingers = 4;
1290 		}
1291 		break;
1292 
1293 	case SS4_PACKET_ID_STICK:
1294 		/*
1295 		 * x, y, and pressure are decoded in
1296 		 * alps_process_packet_ss4_v2()
1297 		 */
1298 		f->first_mp = 0;
1299 		f->is_mp = 0;
1300 		break;
1301 
1302 	case SS4_PACKET_ID_IDLE:
1303 	default:
1304 		memset(f, 0, sizeof(struct alps_fields));
1305 		break;
1306 	}
1307 
1308 	/* handle buttons */
1309 	if (pkt_id == SS4_PACKET_ID_STICK) {
1310 		f->ts_left = !!(SS4_BTN_V2(p) & 0x01);
1311 		f->ts_right = !!(SS4_BTN_V2(p) & 0x02);
1312 		f->ts_middle = !!(SS4_BTN_V2(p) & 0x04);
1313 	} else {
1314 		f->left = !!(SS4_BTN_V2(p) & 0x01);
1315 		if (!(priv->flags & ALPS_BUTTONPAD)) {
1316 			f->right = !!(SS4_BTN_V2(p) & 0x02);
1317 			f->middle = !!(SS4_BTN_V2(p) & 0x04);
1318 		}
1319 	}
1320 
1321 	return 0;
1322 }
1323 
1324 static void alps_process_packet_ss4_v2(struct psmouse *psmouse)
1325 {
1326 	struct alps_data *priv = psmouse->private;
1327 	unsigned char *packet = psmouse->packet;
1328 	struct input_dev *dev = psmouse->dev;
1329 	struct input_dev *dev2 = priv->dev2;
1330 	struct alps_fields *f = &priv->f;
1331 
1332 	memset(f, 0, sizeof(struct alps_fields));
1333 	priv->decode_fields(f, packet, psmouse);
1334 	if (priv->multi_packet) {
1335 		/*
1336 		 * Sometimes the first packet will indicate a multi-packet
1337 		 * sequence, but sometimes the next multi-packet would not
1338 		 * come. Check for this, and when it happens process the
1339 		 * position packet as usual.
1340 		 */
1341 		if (f->is_mp) {
1342 			/* Now process the 1st packet */
1343 			priv->decode_fields(f, priv->multi_data, psmouse);
1344 		} else {
1345 			priv->multi_packet = 0;
1346 		}
1347 	}
1348 
1349 	/*
1350 	 * "f.is_mp" would always be '0' after merging the 1st and 2nd packet.
1351 	 * When it is set, it means 2nd packet comes without 1st packet come.
1352 	 */
1353 	if (f->is_mp)
1354 		return;
1355 
1356 	/* Save the first packet */
1357 	if (!priv->multi_packet && f->first_mp) {
1358 		priv->multi_packet = 1;
1359 		memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
1360 		return;
1361 	}
1362 
1363 	priv->multi_packet = 0;
1364 
1365 	/* Report trackstick */
1366 	if (alps_get_pkt_id_ss4_v2(packet) == SS4_PACKET_ID_STICK) {
1367 		if (!(priv->flags & ALPS_DUALPOINT)) {
1368 			psmouse_warn(psmouse,
1369 				     "Rejected trackstick packet from non DualPoint device");
1370 			return;
1371 		}
1372 
1373 		input_report_rel(dev2, REL_X, SS4_TS_X_V2(packet));
1374 		input_report_rel(dev2, REL_Y, SS4_TS_Y_V2(packet));
1375 		input_report_abs(dev2, ABS_PRESSURE, SS4_TS_Z_V2(packet));
1376 
1377 		input_report_key(dev2, BTN_LEFT, f->ts_left);
1378 		input_report_key(dev2, BTN_RIGHT, f->ts_right);
1379 		input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
1380 
1381 		input_sync(dev2);
1382 		return;
1383 	}
1384 
1385 	/* Report touchpad */
1386 	alps_report_mt_data(psmouse, (f->fingers <= 4) ? f->fingers : 4);
1387 
1388 	input_mt_report_finger_count(dev, f->fingers);
1389 
1390 	input_report_key(dev, BTN_LEFT, f->left);
1391 	input_report_key(dev, BTN_RIGHT, f->right);
1392 	input_report_key(dev, BTN_MIDDLE, f->middle);
1393 
1394 	input_report_abs(dev, ABS_PRESSURE, f->pressure);
1395 	input_sync(dev);
1396 }
1397 
1398 static bool alps_is_valid_package_ss4_v2(struct psmouse *psmouse)
1399 {
1400 	if (psmouse->pktcnt == 4 && ((psmouse->packet[3] & 0x08) != 0x08))
1401 		return false;
1402 	if (psmouse->pktcnt == 6 && ((psmouse->packet[5] & 0x10) != 0x0))
1403 		return false;
1404 	return true;
1405 }
1406 
1407 static DEFINE_MUTEX(alps_mutex);
1408 
1409 static void alps_register_bare_ps2_mouse(struct work_struct *work)
1410 {
1411 	struct alps_data *priv =
1412 		container_of(work, struct alps_data, dev3_register_work.work);
1413 	struct psmouse *psmouse = priv->psmouse;
1414 	struct input_dev *dev3;
1415 	int error = 0;
1416 
1417 	mutex_lock(&alps_mutex);
1418 
1419 	if (priv->dev3)
1420 		goto out;
1421 
1422 	dev3 = input_allocate_device();
1423 	if (!dev3) {
1424 		psmouse_err(psmouse, "failed to allocate secondary device\n");
1425 		error = -ENOMEM;
1426 		goto out;
1427 	}
1428 
1429 	snprintf(priv->phys3, sizeof(priv->phys3), "%s/%s",
1430 		 psmouse->ps2dev.serio->phys,
1431 		 (priv->dev2 ? "input2" : "input1"));
1432 	dev3->phys = priv->phys3;
1433 
1434 	/*
1435 	 * format of input device name is: "protocol vendor name"
1436 	 * see function psmouse_switch_protocol() in psmouse-base.c
1437 	 */
1438 	dev3->name = "PS/2 ALPS Mouse";
1439 
1440 	dev3->id.bustype = BUS_I8042;
1441 	dev3->id.vendor  = 0x0002;
1442 	dev3->id.product = PSMOUSE_PS2;
1443 	dev3->id.version = 0x0000;
1444 	dev3->dev.parent = &psmouse->ps2dev.serio->dev;
1445 
1446 	input_set_capability(dev3, EV_REL, REL_X);
1447 	input_set_capability(dev3, EV_REL, REL_Y);
1448 	input_set_capability(dev3, EV_KEY, BTN_LEFT);
1449 	input_set_capability(dev3, EV_KEY, BTN_RIGHT);
1450 	input_set_capability(dev3, EV_KEY, BTN_MIDDLE);
1451 
1452 	__set_bit(INPUT_PROP_POINTER, dev3->propbit);
1453 
1454 	error = input_register_device(dev3);
1455 	if (error) {
1456 		psmouse_err(psmouse,
1457 			    "failed to register secondary device: %d\n",
1458 			    error);
1459 		input_free_device(dev3);
1460 		goto out;
1461 	}
1462 
1463 	priv->dev3 = dev3;
1464 
1465 out:
1466 	/*
1467 	 * Save the error code so that we can detect that we
1468 	 * already tried to create the device.
1469 	 */
1470 	if (error)
1471 		priv->dev3 = ERR_PTR(error);
1472 
1473 	mutex_unlock(&alps_mutex);
1474 }
1475 
1476 static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
1477 					unsigned char packet[],
1478 					bool report_buttons)
1479 {
1480 	struct alps_data *priv = psmouse->private;
1481 	struct input_dev *dev, *dev2 = NULL;
1482 
1483 	/* Figure out which device to use to report the bare packet */
1484 	if (priv->proto_version == ALPS_PROTO_V2 &&
1485 	    (priv->flags & ALPS_DUALPOINT)) {
1486 		/* On V2 devices the DualPoint Stick reports bare packets */
1487 		dev = priv->dev2;
1488 		dev2 = psmouse->dev;
1489 	} else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
1490 		/* Register dev3 mouse if we received PS/2 packet first time */
1491 		if (!IS_ERR(priv->dev3))
1492 			psmouse_queue_work(psmouse, &priv->dev3_register_work,
1493 					   0);
1494 		return;
1495 	} else {
1496 		dev = priv->dev3;
1497 	}
1498 
1499 	if (report_buttons)
1500 		alps_report_buttons(dev, dev2,
1501 				packet[0] & 1, packet[0] & 2, packet[0] & 4);
1502 
1503 	input_report_rel(dev, REL_X,
1504 		packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
1505 	input_report_rel(dev, REL_Y,
1506 		packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);
1507 
1508 	input_sync(dev);
1509 }
1510 
1511 static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
1512 {
1513 	struct alps_data *priv = psmouse->private;
1514 
1515 	if (psmouse->pktcnt < 6)
1516 		return PSMOUSE_GOOD_DATA;
1517 
1518 	if (psmouse->pktcnt == 6) {
1519 		/*
1520 		 * Start a timer to flush the packet if it ends up last
1521 		 * 6-byte packet in the stream. Timer needs to fire
1522 		 * psmouse core times out itself. 20 ms should be enough
1523 		 * to decide if we are getting more data or not.
1524 		 */
1525 		mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
1526 		return PSMOUSE_GOOD_DATA;
1527 	}
1528 
1529 	del_timer(&priv->timer);
1530 
1531 	if (psmouse->packet[6] & 0x80) {
1532 
1533 		/*
1534 		 * Highest bit is set - that means we either had
1535 		 * complete ALPS packet and this is start of the
1536 		 * next packet or we got garbage.
1537 		 */
1538 
1539 		if (((psmouse->packet[3] |
1540 		      psmouse->packet[4] |
1541 		      psmouse->packet[5]) & 0x80) ||
1542 		    (!alps_is_valid_first_byte(priv, psmouse->packet[6]))) {
1543 			psmouse_dbg(psmouse,
1544 				    "refusing packet %4ph (suspected interleaved ps/2)\n",
1545 				    psmouse->packet + 3);
1546 			return PSMOUSE_BAD_DATA;
1547 		}
1548 
1549 		priv->process_packet(psmouse);
1550 
1551 		/* Continue with the next packet */
1552 		psmouse->packet[0] = psmouse->packet[6];
1553 		psmouse->pktcnt = 1;
1554 
1555 	} else {
1556 
1557 		/*
1558 		 * High bit is 0 - that means that we indeed got a PS/2
1559 		 * packet in the middle of ALPS packet.
1560 		 *
1561 		 * There is also possibility that we got 6-byte ALPS
1562 		 * packet followed  by 3-byte packet from trackpoint. We
1563 		 * can not distinguish between these 2 scenarios but
1564 		 * because the latter is unlikely to happen in course of
1565 		 * normal operation (user would need to press all
1566 		 * buttons on the pad and start moving trackpoint
1567 		 * without touching the pad surface) we assume former.
1568 		 * Even if we are wrong the wost thing that would happen
1569 		 * the cursor would jump but we should not get protocol
1570 		 * de-synchronization.
1571 		 */
1572 
1573 		alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
1574 					    false);
1575 
1576 		/*
1577 		 * Continue with the standard ALPS protocol handling,
1578 		 * but make sure we won't process it as an interleaved
1579 		 * packet again, which may happen if all buttons are
1580 		 * pressed. To avoid this let's reset the 4th bit which
1581 		 * is normally 1.
1582 		 */
1583 		psmouse->packet[3] = psmouse->packet[6] & 0xf7;
1584 		psmouse->pktcnt = 4;
1585 	}
1586 
1587 	return PSMOUSE_GOOD_DATA;
1588 }
1589 
1590 static void alps_flush_packet(unsigned long data)
1591 {
1592 	struct psmouse *psmouse = (struct psmouse *)data;
1593 	struct alps_data *priv = psmouse->private;
1594 
1595 	serio_pause_rx(psmouse->ps2dev.serio);
1596 
1597 	if (psmouse->pktcnt == psmouse->pktsize) {
1598 
1599 		/*
1600 		 * We did not any more data in reasonable amount of time.
1601 		 * Validate the last 3 bytes and process as a standard
1602 		 * ALPS packet.
1603 		 */
1604 		if ((psmouse->packet[3] |
1605 		     psmouse->packet[4] |
1606 		     psmouse->packet[5]) & 0x80) {
1607 			psmouse_dbg(psmouse,
1608 				    "refusing packet %3ph (suspected interleaved ps/2)\n",
1609 				    psmouse->packet + 3);
1610 		} else {
1611 			priv->process_packet(psmouse);
1612 		}
1613 		psmouse->pktcnt = 0;
1614 	}
1615 
1616 	serio_continue_rx(psmouse->ps2dev.serio);
1617 }
1618 
1619 static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
1620 {
1621 	struct alps_data *priv = psmouse->private;
1622 
1623 	/*
1624 	 * Check if we are dealing with a bare PS/2 packet, presumably from
1625 	 * a device connected to the external PS/2 port. Because bare PS/2
1626 	 * protocol does not have enough constant bits to self-synchronize
1627 	 * properly we only do this if the device is fully synchronized.
1628 	 * Can not distinguish V8's first byte from PS/2 packet's
1629 	 */
1630 	if (priv->proto_version != ALPS_PROTO_V8 &&
1631 	    !psmouse->out_of_sync_cnt &&
1632 	    (psmouse->packet[0] & 0xc8) == 0x08) {
1633 
1634 		if (psmouse->pktcnt == 3) {
1635 			alps_report_bare_ps2_packet(psmouse, psmouse->packet,
1636 						    true);
1637 			return PSMOUSE_FULL_PACKET;
1638 		}
1639 		return PSMOUSE_GOOD_DATA;
1640 	}
1641 
1642 	/* Check for PS/2 packet stuffed in the middle of ALPS packet. */
1643 
1644 	if ((priv->flags & ALPS_PS2_INTERLEAVED) &&
1645 	    psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
1646 		return alps_handle_interleaved_ps2(psmouse);
1647 	}
1648 
1649 	if (!alps_is_valid_first_byte(priv, psmouse->packet[0])) {
1650 		psmouse_dbg(psmouse,
1651 			    "refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
1652 			    psmouse->packet[0], priv->mask0, priv->byte0);
1653 		return PSMOUSE_BAD_DATA;
1654 	}
1655 
1656 	/* Bytes 2 - pktsize should have 0 in the highest bit */
1657 	if (priv->proto_version < ALPS_PROTO_V5 &&
1658 	    psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize &&
1659 	    (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
1660 		psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1661 			    psmouse->pktcnt - 1,
1662 			    psmouse->packet[psmouse->pktcnt - 1]);
1663 
1664 		if (priv->proto_version == ALPS_PROTO_V3_RUSHMORE &&
1665 		    psmouse->pktcnt == psmouse->pktsize) {
1666 			/*
1667 			 * Some Dell boxes, such as Latitude E6440 or E7440
1668 			 * with closed lid, quite often smash last byte of
1669 			 * otherwise valid packet with 0xff. Given that the
1670 			 * next packet is very likely to be valid let's
1671 			 * report PSMOUSE_FULL_PACKET but not process data,
1672 			 * rather than reporting PSMOUSE_BAD_DATA and
1673 			 * filling the logs.
1674 			 */
1675 			return PSMOUSE_FULL_PACKET;
1676 		}
1677 
1678 		return PSMOUSE_BAD_DATA;
1679 	}
1680 
1681 	if ((priv->proto_version == ALPS_PROTO_V7 &&
1682 			!alps_is_valid_package_v7(psmouse)) ||
1683 	    (priv->proto_version == ALPS_PROTO_V8 &&
1684 			!alps_is_valid_package_ss4_v2(psmouse))) {
1685 		psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1686 			    psmouse->pktcnt - 1,
1687 			    psmouse->packet[psmouse->pktcnt - 1]);
1688 		return PSMOUSE_BAD_DATA;
1689 	}
1690 
1691 	if (psmouse->pktcnt == psmouse->pktsize) {
1692 		priv->process_packet(psmouse);
1693 		return PSMOUSE_FULL_PACKET;
1694 	}
1695 
1696 	return PSMOUSE_GOOD_DATA;
1697 }
1698 
1699 static int alps_command_mode_send_nibble(struct psmouse *psmouse, int nibble)
1700 {
1701 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1702 	struct alps_data *priv = psmouse->private;
1703 	int command;
1704 	unsigned char *param;
1705 	unsigned char dummy[4];
1706 
1707 	BUG_ON(nibble > 0xf);
1708 
1709 	command = priv->nibble_commands[nibble].command;
1710 	param = (command & 0x0f00) ?
1711 		dummy : (unsigned char *)&priv->nibble_commands[nibble].data;
1712 
1713 	if (ps2_command(ps2dev, param, command))
1714 		return -1;
1715 
1716 	return 0;
1717 }
1718 
1719 static int alps_command_mode_set_addr(struct psmouse *psmouse, int addr)
1720 {
1721 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1722 	struct alps_data *priv = psmouse->private;
1723 	int i, nibble;
1724 
1725 	if (ps2_command(ps2dev, NULL, priv->addr_command))
1726 		return -1;
1727 
1728 	for (i = 12; i >= 0; i -= 4) {
1729 		nibble = (addr >> i) & 0xf;
1730 		if (alps_command_mode_send_nibble(psmouse, nibble))
1731 			return -1;
1732 	}
1733 
1734 	return 0;
1735 }
1736 
1737 static int __alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1738 {
1739 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1740 	unsigned char param[4];
1741 
1742 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1743 		return -1;
1744 
1745 	/*
1746 	 * The address being read is returned in the first two bytes
1747 	 * of the result. Check that this address matches the expected
1748 	 * address.
1749 	 */
1750 	if (addr != ((param[0] << 8) | param[1]))
1751 		return -1;
1752 
1753 	return param[2];
1754 }
1755 
1756 static int alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1757 {
1758 	if (alps_command_mode_set_addr(psmouse, addr))
1759 		return -1;
1760 	return __alps_command_mode_read_reg(psmouse, addr);
1761 }
1762 
1763 static int __alps_command_mode_write_reg(struct psmouse *psmouse, u8 value)
1764 {
1765 	if (alps_command_mode_send_nibble(psmouse, (value >> 4) & 0xf))
1766 		return -1;
1767 	if (alps_command_mode_send_nibble(psmouse, value & 0xf))
1768 		return -1;
1769 	return 0;
1770 }
1771 
1772 static int alps_command_mode_write_reg(struct psmouse *psmouse, int addr,
1773 				       u8 value)
1774 {
1775 	if (alps_command_mode_set_addr(psmouse, addr))
1776 		return -1;
1777 	return __alps_command_mode_write_reg(psmouse, value);
1778 }
1779 
1780 static int alps_rpt_cmd(struct psmouse *psmouse, int init_command,
1781 			int repeated_command, unsigned char *param)
1782 {
1783 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1784 
1785 	param[0] = 0;
1786 	if (init_command && ps2_command(ps2dev, param, init_command))
1787 		return -EIO;
1788 
1789 	if (ps2_command(ps2dev,  NULL, repeated_command) ||
1790 	    ps2_command(ps2dev,  NULL, repeated_command) ||
1791 	    ps2_command(ps2dev,  NULL, repeated_command))
1792 		return -EIO;
1793 
1794 	param[0] = param[1] = param[2] = 0xff;
1795 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1796 		return -EIO;
1797 
1798 	psmouse_dbg(psmouse, "%2.2X report: %3ph\n",
1799 		    repeated_command, param);
1800 	return 0;
1801 }
1802 
1803 static bool alps_check_valid_firmware_id(unsigned char id[])
1804 {
1805 	if (id[0] == 0x73)
1806 		return true;
1807 
1808 	if (id[0] == 0x88 &&
1809 	    (id[1] == 0x07 ||
1810 	     id[1] == 0x08 ||
1811 	     (id[1] & 0xf0) == 0xb0 ||
1812 	     (id[1] & 0xf0) == 0xc0)) {
1813 		return true;
1814 	}
1815 
1816 	return false;
1817 }
1818 
1819 static int alps_enter_command_mode(struct psmouse *psmouse)
1820 {
1821 	unsigned char param[4];
1822 
1823 	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_RESET_WRAP, param)) {
1824 		psmouse_err(psmouse, "failed to enter command mode\n");
1825 		return -1;
1826 	}
1827 
1828 	if (!alps_check_valid_firmware_id(param)) {
1829 		psmouse_dbg(psmouse,
1830 			    "unknown response while entering command mode\n");
1831 		return -1;
1832 	}
1833 	return 0;
1834 }
1835 
1836 static inline int alps_exit_command_mode(struct psmouse *psmouse)
1837 {
1838 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1839 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM))
1840 		return -1;
1841 	return 0;
1842 }
1843 
1844 /*
1845  * For DualPoint devices select the device that should respond to
1846  * subsequent commands. It looks like glidepad is behind stickpointer,
1847  * I'd thought it would be other way around...
1848  */
1849 static int alps_passthrough_mode_v2(struct psmouse *psmouse, bool enable)
1850 {
1851 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1852 	int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
1853 
1854 	if (ps2_command(ps2dev, NULL, cmd) ||
1855 	    ps2_command(ps2dev, NULL, cmd) ||
1856 	    ps2_command(ps2dev, NULL, cmd) ||
1857 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1858 		return -1;
1859 
1860 	/* we may get 3 more bytes, just ignore them */
1861 	ps2_drain(ps2dev, 3, 100);
1862 
1863 	return 0;
1864 }
1865 
1866 static int alps_absolute_mode_v1_v2(struct psmouse *psmouse)
1867 {
1868 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1869 
1870 	/* Try ALPS magic knock - 4 disable before enable */
1871 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1872 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1873 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1874 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1875 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
1876 		return -1;
1877 
1878 	/*
1879 	 * Switch mouse to poll (remote) mode so motion data will not
1880 	 * get in our way
1881 	 */
1882 	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
1883 }
1884 
1885 static int alps_monitor_mode_send_word(struct psmouse *psmouse, u16 word)
1886 {
1887 	int i, nibble;
1888 
1889 	/*
1890 	 * b0-b11 are valid bits, send sequence is inverse.
1891 	 * e.g. when word = 0x0123, nibble send sequence is 3, 2, 1
1892 	 */
1893 	for (i = 0; i <= 8; i += 4) {
1894 		nibble = (word >> i) & 0xf;
1895 		if (alps_command_mode_send_nibble(psmouse, nibble))
1896 			return -1;
1897 	}
1898 
1899 	return 0;
1900 }
1901 
1902 static int alps_monitor_mode_write_reg(struct psmouse *psmouse,
1903 				       u16 addr, u16 value)
1904 {
1905 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1906 
1907 	/* 0x0A0 is the command to write the word */
1908 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE) ||
1909 	    alps_monitor_mode_send_word(psmouse, 0x0A0) ||
1910 	    alps_monitor_mode_send_word(psmouse, addr) ||
1911 	    alps_monitor_mode_send_word(psmouse, value) ||
1912 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1913 		return -1;
1914 
1915 	return 0;
1916 }
1917 
1918 static int alps_monitor_mode(struct psmouse *psmouse, bool enable)
1919 {
1920 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1921 
1922 	if (enable) {
1923 		/* EC E9 F5 F5 E7 E6 E7 E9 to enter monitor mode */
1924 		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
1925 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO) ||
1926 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1927 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1928 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1929 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1930 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1931 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO))
1932 			return -1;
1933 	} else {
1934 		/* EC to exit monitor mode */
1935 		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP))
1936 			return -1;
1937 	}
1938 
1939 	return 0;
1940 }
1941 
1942 static int alps_absolute_mode_v6(struct psmouse *psmouse)
1943 {
1944 	u16 reg_val = 0x181;
1945 	int ret = -1;
1946 
1947 	/* enter monitor mode, to write the register */
1948 	if (alps_monitor_mode(psmouse, true))
1949 		return -1;
1950 
1951 	ret = alps_monitor_mode_write_reg(psmouse, 0x000, reg_val);
1952 
1953 	if (alps_monitor_mode(psmouse, false))
1954 		ret = -1;
1955 
1956 	return ret;
1957 }
1958 
1959 static int alps_get_status(struct psmouse *psmouse, char *param)
1960 {
1961 	/* Get status: 0xF5 0xF5 0xF5 0xE9 */
1962 	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_DISABLE, param))
1963 		return -1;
1964 
1965 	return 0;
1966 }
1967 
1968 /*
1969  * Turn touchpad tapping on or off. The sequences are:
1970  * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
1971  * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
1972  * My guess that 0xE9 (GetInfo) is here as a sync point.
1973  * For models that also have stickpointer (DualPoints) its tapping
1974  * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
1975  * we don't fiddle with it.
1976  */
1977 static int alps_tap_mode(struct psmouse *psmouse, int enable)
1978 {
1979 	struct ps2dev *ps2dev = &psmouse->ps2dev;
1980 	int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
1981 	unsigned char tap_arg = enable ? 0x0A : 0x00;
1982 	unsigned char param[4];
1983 
1984 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
1985 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1986 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1987 	    ps2_command(ps2dev, &tap_arg, cmd))
1988 		return -1;
1989 
1990 	if (alps_get_status(psmouse, param))
1991 		return -1;
1992 
1993 	return 0;
1994 }
1995 
1996 /*
1997  * alps_poll() - poll the touchpad for current motion packet.
1998  * Used in resync.
1999  */
2000 static int alps_poll(struct psmouse *psmouse)
2001 {
2002 	struct alps_data *priv = psmouse->private;
2003 	unsigned char buf[sizeof(psmouse->packet)];
2004 	bool poll_failed;
2005 
2006 	if (priv->flags & ALPS_PASS)
2007 		alps_passthrough_mode_v2(psmouse, true);
2008 
2009 	poll_failed = ps2_command(&psmouse->ps2dev, buf,
2010 				  PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
2011 
2012 	if (priv->flags & ALPS_PASS)
2013 		alps_passthrough_mode_v2(psmouse, false);
2014 
2015 	if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
2016 		return -1;
2017 
2018 	if ((psmouse->badbyte & 0xc8) == 0x08) {
2019 /*
2020  * Poll the track stick ...
2021  */
2022 		if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
2023 			return -1;
2024 	}
2025 
2026 	memcpy(psmouse->packet, buf, sizeof(buf));
2027 	return 0;
2028 }
2029 
2030 static int alps_hw_init_v1_v2(struct psmouse *psmouse)
2031 {
2032 	struct alps_data *priv = psmouse->private;
2033 
2034 	if ((priv->flags & ALPS_PASS) &&
2035 	    alps_passthrough_mode_v2(psmouse, true)) {
2036 		return -1;
2037 	}
2038 
2039 	if (alps_tap_mode(psmouse, true)) {
2040 		psmouse_warn(psmouse, "Failed to enable hardware tapping\n");
2041 		return -1;
2042 	}
2043 
2044 	if (alps_absolute_mode_v1_v2(psmouse)) {
2045 		psmouse_err(psmouse, "Failed to enable absolute mode\n");
2046 		return -1;
2047 	}
2048 
2049 	if ((priv->flags & ALPS_PASS) &&
2050 	    alps_passthrough_mode_v2(psmouse, false)) {
2051 		return -1;
2052 	}
2053 
2054 	/* ALPS needs stream mode, otherwise it won't report any data */
2055 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
2056 		psmouse_err(psmouse, "Failed to enable stream mode\n");
2057 		return -1;
2058 	}
2059 
2060 	return 0;
2061 }
2062 
2063 static int alps_hw_init_v6(struct psmouse *psmouse)
2064 {
2065 	unsigned char param[2] = {0xC8, 0x14};
2066 
2067 	/* Enter passthrough mode to let trackpoint enter 6byte raw mode */
2068 	if (alps_passthrough_mode_v2(psmouse, true))
2069 		return -1;
2070 
2071 	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2072 	    ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2073 	    ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2074 	    ps2_command(&psmouse->ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2075 	    ps2_command(&psmouse->ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2076 		return -1;
2077 
2078 	if (alps_passthrough_mode_v2(psmouse, false))
2079 		return -1;
2080 
2081 	if (alps_absolute_mode_v6(psmouse)) {
2082 		psmouse_err(psmouse, "Failed to enable absolute mode\n");
2083 		return -1;
2084 	}
2085 
2086 	return 0;
2087 }
2088 
2089 /*
2090  * Enable or disable passthrough mode to the trackstick.
2091  */
2092 static int alps_passthrough_mode_v3(struct psmouse *psmouse,
2093 				    int reg_base, bool enable)
2094 {
2095 	int reg_val, ret = -1;
2096 
2097 	if (alps_enter_command_mode(psmouse))
2098 		return -1;
2099 
2100 	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x0008);
2101 	if (reg_val == -1)
2102 		goto error;
2103 
2104 	if (enable)
2105 		reg_val |= 0x01;
2106 	else
2107 		reg_val &= ~0x01;
2108 
2109 	ret = __alps_command_mode_write_reg(psmouse, reg_val);
2110 
2111 error:
2112 	if (alps_exit_command_mode(psmouse))
2113 		ret = -1;
2114 	return ret;
2115 }
2116 
2117 /* Must be in command mode when calling this function */
2118 static int alps_absolute_mode_v3(struct psmouse *psmouse)
2119 {
2120 	int reg_val;
2121 
2122 	reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2123 	if (reg_val == -1)
2124 		return -1;
2125 
2126 	reg_val |= 0x06;
2127 	if (__alps_command_mode_write_reg(psmouse, reg_val))
2128 		return -1;
2129 
2130 	return 0;
2131 }
2132 
2133 static int alps_probe_trackstick_v3_v7(struct psmouse *psmouse, int reg_base)
2134 {
2135 	int ret = -EIO, reg_val;
2136 
2137 	if (alps_enter_command_mode(psmouse))
2138 		goto error;
2139 
2140 	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
2141 	if (reg_val == -1)
2142 		goto error;
2143 
2144 	/* bit 7: trackstick is present */
2145 	ret = reg_val & 0x80 ? 0 : -ENODEV;
2146 
2147 error:
2148 	alps_exit_command_mode(psmouse);
2149 	return ret;
2150 }
2151 
2152 static int alps_setup_trackstick_v3(struct psmouse *psmouse, int reg_base)
2153 {
2154 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2155 	int ret = 0;
2156 	unsigned char param[4];
2157 
2158 	if (alps_passthrough_mode_v3(psmouse, reg_base, true))
2159 		return -EIO;
2160 
2161 	/*
2162 	 * E7 report for the trackstick
2163 	 *
2164 	 * There have been reports of failures to seem to trace back
2165 	 * to the above trackstick check failing. When these occur
2166 	 * this E7 report fails, so when that happens we continue
2167 	 * with the assumption that there isn't a trackstick after
2168 	 * all.
2169 	 */
2170 	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_SETSCALE21, param)) {
2171 		psmouse_warn(psmouse, "Failed to initialize trackstick (E7 report failed)\n");
2172 		ret = -ENODEV;
2173 	} else {
2174 		psmouse_dbg(psmouse, "trackstick E7 report: %3ph\n", param);
2175 
2176 		/*
2177 		 * Not sure what this does, but it is absolutely
2178 		 * essential. Without it, the touchpad does not
2179 		 * work at all and the trackstick just emits normal
2180 		 * PS/2 packets.
2181 		 */
2182 		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2183 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2184 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2185 		    alps_command_mode_send_nibble(psmouse, 0x9) ||
2186 		    alps_command_mode_send_nibble(psmouse, 0x4)) {
2187 			psmouse_err(psmouse,
2188 				    "Error sending magic E6 sequence\n");
2189 			ret = -EIO;
2190 			goto error;
2191 		}
2192 
2193 		/*
2194 		 * This ensures the trackstick packets are in the format
2195 		 * supported by this driver. If bit 1 isn't set the packet
2196 		 * format is different.
2197 		 */
2198 		if (alps_enter_command_mode(psmouse) ||
2199 		    alps_command_mode_write_reg(psmouse,
2200 						reg_base + 0x08, 0x82) ||
2201 		    alps_exit_command_mode(psmouse))
2202 			ret = -EIO;
2203 	}
2204 
2205 error:
2206 	if (alps_passthrough_mode_v3(psmouse, reg_base, false))
2207 		ret = -EIO;
2208 
2209 	return ret;
2210 }
2211 
2212 static int alps_hw_init_v3(struct psmouse *psmouse)
2213 {
2214 	struct alps_data *priv = psmouse->private;
2215 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2216 	int reg_val;
2217 	unsigned char param[4];
2218 
2219 	if ((priv->flags & ALPS_DUALPOINT) &&
2220 	    alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
2221 		goto error;
2222 
2223 	if (alps_enter_command_mode(psmouse) ||
2224 	    alps_absolute_mode_v3(psmouse)) {
2225 		psmouse_err(psmouse, "Failed to enter absolute mode\n");
2226 		goto error;
2227 	}
2228 
2229 	reg_val = alps_command_mode_read_reg(psmouse, 0x0006);
2230 	if (reg_val == -1)
2231 		goto error;
2232 	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2233 		goto error;
2234 
2235 	reg_val = alps_command_mode_read_reg(psmouse, 0x0007);
2236 	if (reg_val == -1)
2237 		goto error;
2238 	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2239 		goto error;
2240 
2241 	if (alps_command_mode_read_reg(psmouse, 0x0144) == -1)
2242 		goto error;
2243 	if (__alps_command_mode_write_reg(psmouse, 0x04))
2244 		goto error;
2245 
2246 	if (alps_command_mode_read_reg(psmouse, 0x0159) == -1)
2247 		goto error;
2248 	if (__alps_command_mode_write_reg(psmouse, 0x03))
2249 		goto error;
2250 
2251 	if (alps_command_mode_read_reg(psmouse, 0x0163) == -1)
2252 		goto error;
2253 	if (alps_command_mode_write_reg(psmouse, 0x0163, 0x03))
2254 		goto error;
2255 
2256 	if (alps_command_mode_read_reg(psmouse, 0x0162) == -1)
2257 		goto error;
2258 	if (alps_command_mode_write_reg(psmouse, 0x0162, 0x04))
2259 		goto error;
2260 
2261 	alps_exit_command_mode(psmouse);
2262 
2263 	/* Set rate and enable data reporting */
2264 	param[0] = 0x64;
2265 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2266 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2267 		psmouse_err(psmouse, "Failed to enable data reporting\n");
2268 		return -1;
2269 	}
2270 
2271 	return 0;
2272 
2273 error:
2274 	/*
2275 	 * Leaving the touchpad in command mode will essentially render
2276 	 * it unusable until the machine reboots, so exit it here just
2277 	 * to be safe
2278 	 */
2279 	alps_exit_command_mode(psmouse);
2280 	return -1;
2281 }
2282 
2283 static int alps_get_v3_v7_resolution(struct psmouse *psmouse, int reg_pitch)
2284 {
2285 	int reg, x_pitch, y_pitch, x_electrode, y_electrode, x_phys, y_phys;
2286 	struct alps_data *priv = psmouse->private;
2287 
2288 	reg = alps_command_mode_read_reg(psmouse, reg_pitch);
2289 	if (reg < 0)
2290 		return reg;
2291 
2292 	x_pitch = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2293 	x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
2294 
2295 	y_pitch = (char)reg >> 4; /* sign extend upper 4 bits */
2296 	y_pitch = 36 + 2 * y_pitch; /* In 0.1 mm units */
2297 
2298 	reg = alps_command_mode_read_reg(psmouse, reg_pitch + 1);
2299 	if (reg < 0)
2300 		return reg;
2301 
2302 	x_electrode = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2303 	x_electrode = 17 + x_electrode;
2304 
2305 	y_electrode = (char)reg >> 4; /* sign extend upper 4 bits */
2306 	y_electrode = 13 + y_electrode;
2307 
2308 	x_phys = x_pitch * (x_electrode - 1); /* In 0.1 mm units */
2309 	y_phys = y_pitch * (y_electrode - 1); /* In 0.1 mm units */
2310 
2311 	priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2312 	priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2313 
2314 	psmouse_dbg(psmouse,
2315 		    "pitch %dx%d num-electrodes %dx%d physical size %dx%d mm res %dx%d\n",
2316 		    x_pitch, y_pitch, x_electrode, y_electrode,
2317 		    x_phys / 10, y_phys / 10, priv->x_res, priv->y_res);
2318 
2319 	return 0;
2320 }
2321 
2322 static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
2323 {
2324 	struct alps_data *priv = psmouse->private;
2325 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2326 	int reg_val, ret = -1;
2327 
2328 	if (priv->flags & ALPS_DUALPOINT) {
2329 		reg_val = alps_setup_trackstick_v3(psmouse,
2330 						   ALPS_REG_BASE_RUSHMORE);
2331 		if (reg_val == -EIO)
2332 			goto error;
2333 	}
2334 
2335 	if (alps_enter_command_mode(psmouse) ||
2336 	    alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
2337 	    alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
2338 		goto error;
2339 
2340 	if (alps_get_v3_v7_resolution(psmouse, 0xc2da))
2341 		goto error;
2342 
2343 	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
2344 	if (reg_val == -1)
2345 		goto error;
2346 	if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
2347 		goto error;
2348 
2349 	if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2350 		goto error;
2351 
2352 	/* enter absolute mode */
2353 	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2354 	if (reg_val == -1)
2355 		goto error;
2356 	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2357 		goto error;
2358 
2359 	alps_exit_command_mode(psmouse);
2360 	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2361 
2362 error:
2363 	alps_exit_command_mode(psmouse);
2364 	return ret;
2365 }
2366 
2367 /* Must be in command mode when calling this function */
2368 static int alps_absolute_mode_v4(struct psmouse *psmouse)
2369 {
2370 	int reg_val;
2371 
2372 	reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2373 	if (reg_val == -1)
2374 		return -1;
2375 
2376 	reg_val |= 0x02;
2377 	if (__alps_command_mode_write_reg(psmouse, reg_val))
2378 		return -1;
2379 
2380 	return 0;
2381 }
2382 
2383 static int alps_hw_init_v4(struct psmouse *psmouse)
2384 {
2385 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2386 	unsigned char param[4];
2387 
2388 	if (alps_enter_command_mode(psmouse))
2389 		goto error;
2390 
2391 	if (alps_absolute_mode_v4(psmouse)) {
2392 		psmouse_err(psmouse, "Failed to enter absolute mode\n");
2393 		goto error;
2394 	}
2395 
2396 	if (alps_command_mode_write_reg(psmouse, 0x0007, 0x8c))
2397 		goto error;
2398 
2399 	if (alps_command_mode_write_reg(psmouse, 0x0149, 0x03))
2400 		goto error;
2401 
2402 	if (alps_command_mode_write_reg(psmouse, 0x0160, 0x03))
2403 		goto error;
2404 
2405 	if (alps_command_mode_write_reg(psmouse, 0x017f, 0x15))
2406 		goto error;
2407 
2408 	if (alps_command_mode_write_reg(psmouse, 0x0151, 0x01))
2409 		goto error;
2410 
2411 	if (alps_command_mode_write_reg(psmouse, 0x0168, 0x03))
2412 		goto error;
2413 
2414 	if (alps_command_mode_write_reg(psmouse, 0x014a, 0x03))
2415 		goto error;
2416 
2417 	if (alps_command_mode_write_reg(psmouse, 0x0161, 0x03))
2418 		goto error;
2419 
2420 	alps_exit_command_mode(psmouse);
2421 
2422 	/*
2423 	 * This sequence changes the output from a 9-byte to an
2424 	 * 8-byte format. All the same data seems to be present,
2425 	 * just in a more compact format.
2426 	 */
2427 	param[0] = 0xc8;
2428 	param[1] = 0x64;
2429 	param[2] = 0x50;
2430 	if (ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2431 	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE) ||
2432 	    ps2_command(ps2dev, &param[2], PSMOUSE_CMD_SETRATE) ||
2433 	    ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
2434 		return -1;
2435 
2436 	/* Set rate and enable data reporting */
2437 	param[0] = 0x64;
2438 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2439 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2440 		psmouse_err(psmouse, "Failed to enable data reporting\n");
2441 		return -1;
2442 	}
2443 
2444 	return 0;
2445 
2446 error:
2447 	/*
2448 	 * Leaving the touchpad in command mode will essentially render
2449 	 * it unusable until the machine reboots, so exit it here just
2450 	 * to be safe
2451 	 */
2452 	alps_exit_command_mode(psmouse);
2453 	return -1;
2454 }
2455 
2456 static int alps_get_otp_values_ss4_v2(struct psmouse *psmouse,
2457 				      unsigned char index, unsigned char otp[])
2458 {
2459 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2460 
2461 	switch (index) {
2462 	case 0:
2463 		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2464 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2465 		    ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2466 			return -1;
2467 
2468 		break;
2469 
2470 	case 1:
2471 		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2472 		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2473 		    ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2474 			return -1;
2475 
2476 		break;
2477 	}
2478 
2479 	return 0;
2480 }
2481 
2482 static int alps_update_device_area_ss4_v2(unsigned char otp[][4],
2483 					  struct alps_data *priv)
2484 {
2485 	int num_x_electrode;
2486 	int num_y_electrode;
2487 	int x_pitch, y_pitch, x_phys, y_phys;
2488 
2489 	if (IS_SS4PLUS_DEV(priv->dev_id)) {
2490 		num_x_electrode =
2491 			SS4PLUS_NUMSENSOR_XOFFSET + (otp[0][2] & 0x0F);
2492 		num_y_electrode =
2493 			SS4PLUS_NUMSENSOR_YOFFSET + ((otp[0][2] >> 4) & 0x0F);
2494 
2495 		priv->x_max =
2496 			(num_x_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
2497 		priv->y_max =
2498 			(num_y_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
2499 
2500 		x_pitch = (otp[0][1] & 0x0F) + SS4PLUS_MIN_PITCH_MM;
2501 		y_pitch = ((otp[0][1] >> 4) & 0x0F) + SS4PLUS_MIN_PITCH_MM;
2502 
2503 	} else {
2504 		num_x_electrode =
2505 			SS4_NUMSENSOR_XOFFSET + (otp[1][0] & 0x0F);
2506 		num_y_electrode =
2507 			SS4_NUMSENSOR_YOFFSET + ((otp[1][0] >> 4) & 0x0F);
2508 
2509 		priv->x_max =
2510 			(num_x_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2511 		priv->y_max =
2512 			(num_y_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2513 
2514 		x_pitch = ((otp[1][2] >> 2) & 0x07) + SS4_MIN_PITCH_MM;
2515 		y_pitch = ((otp[1][2] >> 5) & 0x07) + SS4_MIN_PITCH_MM;
2516 	}
2517 
2518 	x_phys = x_pitch * (num_x_electrode - 1); /* In 0.1 mm units */
2519 	y_phys = y_pitch * (num_y_electrode - 1); /* In 0.1 mm units */
2520 
2521 	priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2522 	priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2523 
2524 	return 0;
2525 }
2526 
2527 static int alps_update_btn_info_ss4_v2(unsigned char otp[][4],
2528 				       struct alps_data *priv)
2529 {
2530 	unsigned char is_btnless;
2531 
2532 	if (IS_SS4PLUS_DEV(priv->dev_id))
2533 		is_btnless = (otp[1][0] >> 1) & 0x01;
2534 	else
2535 		is_btnless = (otp[1][1] >> 3) & 0x01;
2536 
2537 	if (is_btnless)
2538 		priv->flags |= ALPS_BUTTONPAD;
2539 
2540 	return 0;
2541 }
2542 
2543 static int alps_update_dual_info_ss4_v2(unsigned char otp[][4],
2544 				       struct alps_data *priv)
2545 {
2546 	bool is_dual = false;
2547 
2548 	if (IS_SS4PLUS_DEV(priv->dev_id))
2549 		is_dual = (otp[0][0] >> 4) & 0x01;
2550 
2551 	if (is_dual)
2552 		priv->flags |= ALPS_DUALPOINT |
2553 					ALPS_DUALPOINT_WITH_PRESSURE;
2554 
2555 	return 0;
2556 }
2557 
2558 static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
2559 				    struct alps_data *priv)
2560 {
2561 	unsigned char otp[2][4];
2562 
2563 	memset(otp, 0, sizeof(otp));
2564 
2565 	if (alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]) ||
2566 	    alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]))
2567 		return -1;
2568 
2569 	alps_update_device_area_ss4_v2(otp, priv);
2570 
2571 	alps_update_btn_info_ss4_v2(otp, priv);
2572 
2573 	alps_update_dual_info_ss4_v2(otp, priv);
2574 
2575 	return 0;
2576 }
2577 
2578 static int alps_dolphin_get_device_area(struct psmouse *psmouse,
2579 					struct alps_data *priv)
2580 {
2581 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2582 	unsigned char param[4] = {0};
2583 	int num_x_electrode, num_y_electrode;
2584 
2585 	if (alps_enter_command_mode(psmouse))
2586 		return -1;
2587 
2588 	param[0] = 0x0a;
2589 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
2590 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2591 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2592 	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2593 	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE))
2594 		return -1;
2595 
2596 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
2597 		return -1;
2598 
2599 	/*
2600 	 * Dolphin's sensor line number is not fixed. It can be calculated
2601 	 * by adding the device's register value with DOLPHIN_PROFILE_X/YOFFSET.
2602 	 * Further more, we can get device's x_max and y_max by multiplying
2603 	 * sensor line number with DOLPHIN_COUNT_PER_ELECTRODE.
2604 	 *
2605 	 * e.g. When we get register's sensor_x = 11 & sensor_y = 8,
2606 	 *	real sensor line number X = 11 + 8 = 19, and
2607 	 *	real sensor line number Y = 8 + 1 = 9.
2608 	 *	So, x_max = (19 - 1) * 64 = 1152, and
2609 	 *	    y_max = (9 - 1) * 64 = 512.
2610 	 */
2611 	num_x_electrode = DOLPHIN_PROFILE_XOFFSET + (param[2] & 0x0F);
2612 	num_y_electrode = DOLPHIN_PROFILE_YOFFSET + ((param[2] >> 4) & 0x0F);
2613 	priv->x_bits = num_x_electrode;
2614 	priv->y_bits = num_y_electrode;
2615 	priv->x_max = (num_x_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2616 	priv->y_max = (num_y_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2617 
2618 	if (alps_exit_command_mode(psmouse))
2619 		return -1;
2620 
2621 	return 0;
2622 }
2623 
2624 static int alps_hw_init_dolphin_v1(struct psmouse *psmouse)
2625 {
2626 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2627 	unsigned char param[2];
2628 
2629 	/* This is dolphin "v1" as empirically defined by florin9doi */
2630 	param[0] = 0x64;
2631 	param[1] = 0x28;
2632 
2633 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2634 	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2635 	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2636 		return -1;
2637 
2638 	return 0;
2639 }
2640 
2641 static int alps_hw_init_v7(struct psmouse *psmouse)
2642 {
2643 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2644 	int reg_val, ret = -1;
2645 
2646 	if (alps_enter_command_mode(psmouse) ||
2647 	    alps_command_mode_read_reg(psmouse, 0xc2d9) == -1)
2648 		goto error;
2649 
2650 	if (alps_get_v3_v7_resolution(psmouse, 0xc397))
2651 		goto error;
2652 
2653 	if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2654 		goto error;
2655 
2656 	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2657 	if (reg_val == -1)
2658 		goto error;
2659 	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2660 		goto error;
2661 
2662 	alps_exit_command_mode(psmouse);
2663 	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2664 
2665 error:
2666 	alps_exit_command_mode(psmouse);
2667 	return ret;
2668 }
2669 
2670 static int alps_hw_init_ss4_v2(struct psmouse *psmouse)
2671 {
2672 	struct ps2dev *ps2dev = &psmouse->ps2dev;
2673 	char param[2] = {0x64, 0x28};
2674 	int ret = -1;
2675 
2676 	/* enter absolute mode */
2677 	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2678 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2679 	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2680 	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE)) {
2681 		goto error;
2682 	}
2683 
2684 	/* T.B.D. Decread noise packet number, delete in the future */
2685 	if (alps_exit_command_mode(psmouse) ||
2686 	    alps_enter_command_mode(psmouse) ||
2687 	    alps_command_mode_write_reg(psmouse, 0x001D, 0x20)) {
2688 		goto error;
2689 	}
2690 	alps_exit_command_mode(psmouse);
2691 
2692 	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2693 
2694 error:
2695 	alps_exit_command_mode(psmouse);
2696 	return ret;
2697 }
2698 
2699 static int alps_set_protocol(struct psmouse *psmouse,
2700 			     struct alps_data *priv,
2701 			     const struct alps_protocol_info *protocol)
2702 {
2703 	psmouse->private = priv;
2704 
2705 	setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);
2706 
2707 	priv->proto_version = protocol->version;
2708 	priv->byte0 = protocol->byte0;
2709 	priv->mask0 = protocol->mask0;
2710 	priv->flags = protocol->flags;
2711 
2712 	priv->x_max = 2000;
2713 	priv->y_max = 1400;
2714 	priv->x_bits = 15;
2715 	priv->y_bits = 11;
2716 
2717 	switch (priv->proto_version) {
2718 	case ALPS_PROTO_V1:
2719 	case ALPS_PROTO_V2:
2720 		priv->hw_init = alps_hw_init_v1_v2;
2721 		priv->process_packet = alps_process_packet_v1_v2;
2722 		priv->set_abs_params = alps_set_abs_params_st;
2723 		priv->x_max = 1023;
2724 		priv->y_max = 767;
2725 		if (dmi_check_system(alps_dmi_has_separate_stick_buttons))
2726 			priv->flags |= ALPS_STICK_BITS;
2727 		break;
2728 
2729 	case ALPS_PROTO_V3:
2730 		priv->hw_init = alps_hw_init_v3;
2731 		priv->process_packet = alps_process_packet_v3;
2732 		priv->set_abs_params = alps_set_abs_params_semi_mt;
2733 		priv->decode_fields = alps_decode_pinnacle;
2734 		priv->nibble_commands = alps_v3_nibble_commands;
2735 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2736 
2737 		if (alps_probe_trackstick_v3_v7(psmouse,
2738 						ALPS_REG_BASE_PINNACLE) < 0)
2739 			priv->flags &= ~ALPS_DUALPOINT;
2740 
2741 		break;
2742 
2743 	case ALPS_PROTO_V3_RUSHMORE:
2744 		priv->hw_init = alps_hw_init_rushmore_v3;
2745 		priv->process_packet = alps_process_packet_v3;
2746 		priv->set_abs_params = alps_set_abs_params_semi_mt;
2747 		priv->decode_fields = alps_decode_rushmore;
2748 		priv->nibble_commands = alps_v3_nibble_commands;
2749 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2750 		priv->x_bits = 16;
2751 		priv->y_bits = 12;
2752 
2753 		if (alps_probe_trackstick_v3_v7(psmouse,
2754 						ALPS_REG_BASE_RUSHMORE) < 0)
2755 			priv->flags &= ~ALPS_DUALPOINT;
2756 
2757 		break;
2758 
2759 	case ALPS_PROTO_V4:
2760 		priv->hw_init = alps_hw_init_v4;
2761 		priv->process_packet = alps_process_packet_v4;
2762 		priv->set_abs_params = alps_set_abs_params_semi_mt;
2763 		priv->nibble_commands = alps_v4_nibble_commands;
2764 		priv->addr_command = PSMOUSE_CMD_DISABLE;
2765 		break;
2766 
2767 	case ALPS_PROTO_V5:
2768 		priv->hw_init = alps_hw_init_dolphin_v1;
2769 		priv->process_packet = alps_process_touchpad_packet_v3_v5;
2770 		priv->decode_fields = alps_decode_dolphin;
2771 		priv->set_abs_params = alps_set_abs_params_semi_mt;
2772 		priv->nibble_commands = alps_v3_nibble_commands;
2773 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2774 		priv->x_bits = 23;
2775 		priv->y_bits = 12;
2776 
2777 		if (alps_dolphin_get_device_area(psmouse, priv))
2778 			return -EIO;
2779 
2780 		break;
2781 
2782 	case ALPS_PROTO_V6:
2783 		priv->hw_init = alps_hw_init_v6;
2784 		priv->process_packet = alps_process_packet_v6;
2785 		priv->set_abs_params = alps_set_abs_params_st;
2786 		priv->nibble_commands = alps_v6_nibble_commands;
2787 		priv->x_max = 2047;
2788 		priv->y_max = 1535;
2789 		break;
2790 
2791 	case ALPS_PROTO_V7:
2792 		priv->hw_init = alps_hw_init_v7;
2793 		priv->process_packet = alps_process_packet_v7;
2794 		priv->decode_fields = alps_decode_packet_v7;
2795 		priv->set_abs_params = alps_set_abs_params_v7;
2796 		priv->nibble_commands = alps_v3_nibble_commands;
2797 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2798 		priv->x_max = 0xfff;
2799 		priv->y_max = 0x7ff;
2800 
2801 		if (priv->fw_ver[1] != 0xba)
2802 			priv->flags |= ALPS_BUTTONPAD;
2803 
2804 		if (alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_V7) < 0)
2805 			priv->flags &= ~ALPS_DUALPOINT;
2806 
2807 		break;
2808 
2809 	case ALPS_PROTO_V8:
2810 		priv->hw_init = alps_hw_init_ss4_v2;
2811 		priv->process_packet = alps_process_packet_ss4_v2;
2812 		priv->decode_fields = alps_decode_ss4_v2;
2813 		priv->set_abs_params = alps_set_abs_params_ss4_v2;
2814 		priv->nibble_commands = alps_v3_nibble_commands;
2815 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2816 
2817 		if (alps_set_defaults_ss4_v2(psmouse, priv))
2818 			return -EIO;
2819 
2820 		break;
2821 	}
2822 
2823 	return 0;
2824 }
2825 
2826 static const struct alps_protocol_info *alps_match_table(unsigned char *e7,
2827 							 unsigned char *ec)
2828 {
2829 	const struct alps_model_info *model;
2830 	int i;
2831 
2832 	for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
2833 		model = &alps_model_data[i];
2834 
2835 		if (!memcmp(e7, model->signature, sizeof(model->signature)))
2836 			return &model->protocol_info;
2837 	}
2838 
2839 	return NULL;
2840 }
2841 
2842 static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
2843 {
2844 	const struct alps_protocol_info *protocol;
2845 	unsigned char e6[4], e7[4], ec[4];
2846 	int error;
2847 
2848 	/*
2849 	 * First try "E6 report".
2850 	 * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
2851 	 * The bits 0-2 of the first byte will be 1s if some buttons are
2852 	 * pressed.
2853 	 */
2854 	if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2855 			 PSMOUSE_CMD_SETSCALE11, e6))
2856 		return -EIO;
2857 
2858 	if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10 && e6[2] != 100))
2859 		return -EINVAL;
2860 
2861 	/*
2862 	 * Now get the "E7" and "EC" reports.  These will uniquely identify
2863 	 * most ALPS touchpads.
2864 	 */
2865 	if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2866 			 PSMOUSE_CMD_SETSCALE21, e7) ||
2867 	    alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2868 			 PSMOUSE_CMD_RESET_WRAP, ec) ||
2869 	    alps_exit_command_mode(psmouse))
2870 		return -EIO;
2871 
2872 	protocol = alps_match_table(e7, ec);
2873 	if (!protocol) {
2874 		if (e7[0] == 0x73 && e7[1] == 0x02 && e7[2] == 0x64 &&
2875 			   ec[2] == 0x8a) {
2876 			protocol = &alps_v4_protocol_data;
2877 		} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
2878 			   ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
2879 			protocol = &alps_v5_protocol_data;
2880 		} else if (ec[0] == 0x88 &&
2881 			   ((ec[1] & 0xf0) == 0xb0 || (ec[1] & 0xf0) == 0xc0)) {
2882 			protocol = &alps_v7_protocol_data;
2883 		} else if (ec[0] == 0x88 && ec[1] == 0x08) {
2884 			protocol = &alps_v3_rushmore_data;
2885 		} else if (ec[0] == 0x88 && ec[1] == 0x07 &&
2886 			   ec[2] >= 0x90 && ec[2] <= 0x9d) {
2887 			protocol = &alps_v3_protocol_data;
2888 		} else if (e7[0] == 0x73 && e7[1] == 0x03 &&
2889 			   (e7[2] == 0x14 || e7[2] == 0x28)) {
2890 			protocol = &alps_v8_protocol_data;
2891 		} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0xc8) {
2892 			protocol = &alps_v9_protocol_data;
2893 			psmouse_warn(psmouse,
2894 				     "Unsupported ALPS V9 touchpad: E7=%3ph, EC=%3ph\n",
2895 				     e7, ec);
2896 			return -EINVAL;
2897 		} else {
2898 			psmouse_dbg(psmouse,
2899 				    "Likely not an ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
2900 			return -EINVAL;
2901 		}
2902 	}
2903 
2904 	if (priv) {
2905 		/* Save Device ID and Firmware version */
2906 		memcpy(priv->dev_id, e7, 3);
2907 		memcpy(priv->fw_ver, ec, 3);
2908 		error = alps_set_protocol(psmouse, priv, protocol);
2909 		if (error)
2910 			return error;
2911 	}
2912 
2913 	return 0;
2914 }
2915 
2916 static int alps_reconnect(struct psmouse *psmouse)
2917 {
2918 	struct alps_data *priv = psmouse->private;
2919 
2920 	psmouse_reset(psmouse);
2921 
2922 	if (alps_identify(psmouse, priv) < 0)
2923 		return -1;
2924 
2925 	return priv->hw_init(psmouse);
2926 }
2927 
2928 static void alps_disconnect(struct psmouse *psmouse)
2929 {
2930 	struct alps_data *priv = psmouse->private;
2931 
2932 	psmouse_reset(psmouse);
2933 	del_timer_sync(&priv->timer);
2934 	if (priv->dev2)
2935 		input_unregister_device(priv->dev2);
2936 	if (!IS_ERR_OR_NULL(priv->dev3))
2937 		input_unregister_device(priv->dev3);
2938 	kfree(priv);
2939 }
2940 
2941 static void alps_set_abs_params_st(struct alps_data *priv,
2942 				   struct input_dev *dev1)
2943 {
2944 	input_set_abs_params(dev1, ABS_X, 0, priv->x_max, 0, 0);
2945 	input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
2946 	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2947 }
2948 
2949 static void alps_set_abs_params_mt_common(struct alps_data *priv,
2950 					  struct input_dev *dev1)
2951 {
2952 	input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
2953 	input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
2954 
2955 	input_abs_set_res(dev1, ABS_MT_POSITION_X, priv->x_res);
2956 	input_abs_set_res(dev1, ABS_MT_POSITION_Y, priv->y_res);
2957 
2958 	set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
2959 	set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
2960 }
2961 
2962 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
2963 					struct input_dev *dev1)
2964 {
2965 	alps_set_abs_params_mt_common(priv, dev1);
2966 	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2967 
2968 	input_mt_init_slots(dev1, MAX_TOUCHES,
2969 			    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2970 				INPUT_MT_SEMI_MT);
2971 }
2972 
2973 static void alps_set_abs_params_v7(struct alps_data *priv,
2974 				   struct input_dev *dev1)
2975 {
2976 	alps_set_abs_params_mt_common(priv, dev1);
2977 	set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2978 
2979 	input_mt_init_slots(dev1, MAX_TOUCHES,
2980 			    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2981 				INPUT_MT_TRACK);
2982 
2983 	set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2984 }
2985 
2986 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
2987 				       struct input_dev *dev1)
2988 {
2989 	alps_set_abs_params_mt_common(priv, dev1);
2990 	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2991 	set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2992 
2993 	input_mt_init_slots(dev1, MAX_TOUCHES,
2994 			    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2995 				INPUT_MT_TRACK);
2996 }
2997 
2998 int alps_init(struct psmouse *psmouse)
2999 {
3000 	struct alps_data *priv = psmouse->private;
3001 	struct input_dev *dev1 = psmouse->dev;
3002 	int error;
3003 
3004 	error = priv->hw_init(psmouse);
3005 	if (error)
3006 		goto init_fail;
3007 
3008 	/*
3009 	 * Undo part of setup done for us by psmouse core since touchpad
3010 	 * is not a relative device.
3011 	 */
3012 	__clear_bit(EV_REL, dev1->evbit);
3013 	__clear_bit(REL_X, dev1->relbit);
3014 	__clear_bit(REL_Y, dev1->relbit);
3015 
3016 	/*
3017 	 * Now set up our capabilities.
3018 	 */
3019 	dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
3020 	dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
3021 	dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
3022 	dev1->keybit[BIT_WORD(BTN_LEFT)] |=
3023 		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
3024 
3025 	dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
3026 
3027 	priv->set_abs_params(priv, dev1);
3028 
3029 	if (priv->flags & ALPS_WHEEL) {
3030 		dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
3031 		dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
3032 	}
3033 
3034 	if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
3035 		dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
3036 		dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
3037 	}
3038 
3039 	if (priv->flags & ALPS_FOUR_BUTTONS) {
3040 		dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
3041 		dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
3042 		dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
3043 		dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
3044 	} else if (priv->flags & ALPS_BUTTONPAD) {
3045 		set_bit(INPUT_PROP_BUTTONPAD, dev1->propbit);
3046 		clear_bit(BTN_RIGHT, dev1->keybit);
3047 	} else {
3048 		dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
3049 	}
3050 
3051 	if (priv->flags & ALPS_DUALPOINT) {
3052 		struct input_dev *dev2;
3053 
3054 		dev2 = input_allocate_device();
3055 		if (!dev2) {
3056 			psmouse_err(psmouse,
3057 				    "failed to allocate trackstick device\n");
3058 			error = -ENOMEM;
3059 			goto init_fail;
3060 		}
3061 
3062 		snprintf(priv->phys2, sizeof(priv->phys2), "%s/input1",
3063 			 psmouse->ps2dev.serio->phys);
3064 		dev2->phys = priv->phys2;
3065 
3066 		/*
3067 		 * format of input device name is: "protocol vendor name"
3068 		 * see function psmouse_switch_protocol() in psmouse-base.c
3069 		 */
3070 		dev2->name = "AlpsPS/2 ALPS DualPoint Stick";
3071 
3072 		dev2->id.bustype = BUS_I8042;
3073 		dev2->id.vendor  = 0x0002;
3074 		dev2->id.product = PSMOUSE_ALPS;
3075 		dev2->id.version = priv->proto_version;
3076 		dev2->dev.parent = &psmouse->ps2dev.serio->dev;
3077 
3078 		input_set_capability(dev2, EV_REL, REL_X);
3079 		input_set_capability(dev2, EV_REL, REL_Y);
3080 		if (priv->flags & ALPS_DUALPOINT_WITH_PRESSURE) {
3081 			input_set_capability(dev2, EV_ABS, ABS_PRESSURE);
3082 			input_set_abs_params(dev2, ABS_PRESSURE, 0, 127, 0, 0);
3083 		}
3084 		input_set_capability(dev2, EV_KEY, BTN_LEFT);
3085 		input_set_capability(dev2, EV_KEY, BTN_RIGHT);
3086 		input_set_capability(dev2, EV_KEY, BTN_MIDDLE);
3087 
3088 		__set_bit(INPUT_PROP_POINTER, dev2->propbit);
3089 		__set_bit(INPUT_PROP_POINTING_STICK, dev2->propbit);
3090 
3091 		error = input_register_device(dev2);
3092 		if (error) {
3093 			psmouse_err(psmouse,
3094 				    "failed to register trackstick device: %d\n",
3095 				    error);
3096 			input_free_device(dev2);
3097 			goto init_fail;
3098 		}
3099 
3100 		priv->dev2 = dev2;
3101 	}
3102 
3103 	priv->psmouse = psmouse;
3104 
3105 	INIT_DELAYED_WORK(&priv->dev3_register_work,
3106 			  alps_register_bare_ps2_mouse);
3107 
3108 	psmouse->protocol_handler = alps_process_byte;
3109 	psmouse->poll = alps_poll;
3110 	psmouse->disconnect = alps_disconnect;
3111 	psmouse->reconnect = alps_reconnect;
3112 	psmouse->pktsize = priv->proto_version == ALPS_PROTO_V4 ? 8 : 6;
3113 
3114 	/* We are having trouble resyncing ALPS touchpads so disable it for now */
3115 	psmouse->resync_time = 0;
3116 
3117 	/* Allow 2 invalid packets without resetting device */
3118 	psmouse->resetafter = psmouse->pktsize * 2;
3119 
3120 	return 0;
3121 
3122 init_fail:
3123 	psmouse_reset(psmouse);
3124 	/*
3125 	 * Even though we did not allocate psmouse->private we do free
3126 	 * it here.
3127 	 */
3128 	kfree(psmouse->private);
3129 	psmouse->private = NULL;
3130 	return error;
3131 }
3132 
3133 int alps_detect(struct psmouse *psmouse, bool set_properties)
3134 {
3135 	struct alps_data *priv;
3136 	int error;
3137 
3138 	error = alps_identify(psmouse, NULL);
3139 	if (error)
3140 		return error;
3141 
3142 	/*
3143 	 * Reset the device to make sure it is fully operational:
3144 	 * on some laptops, like certain Dell Latitudes, we may
3145 	 * fail to properly detect presence of trackstick if device
3146 	 * has not been reset.
3147 	 */
3148 	psmouse_reset(psmouse);
3149 
3150 	priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
3151 	if (!priv)
3152 		return -ENOMEM;
3153 
3154 	error = alps_identify(psmouse, priv);
3155 	if (error) {
3156 		kfree(priv);
3157 		return error;
3158 	}
3159 
3160 	if (set_properties) {
3161 		psmouse->vendor = "ALPS";
3162 		psmouse->name = priv->flags & ALPS_DUALPOINT ?
3163 				"DualPoint TouchPad" : "GlidePoint";
3164 		psmouse->model = priv->proto_version;
3165 	} else {
3166 		/*
3167 		 * Destroy alps_data structure we allocated earlier since
3168 		 * this was just a "trial run". Otherwise we'll keep it
3169 		 * to be used by alps_init() which has to be called if
3170 		 * we succeed and set_properties is true.
3171 		 */
3172 		kfree(priv);
3173 		psmouse->private = NULL;
3174 	}
3175 
3176 	return 0;
3177 }
3178 
3179