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Merge branch 'for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
[linux-2.6-block.git] / drivers / input / mouse / elantech.c
CommitLineData
2a0bd75e 1/*
3f8c0df4 2 * Elantech Touchpad driver (v6)
2a0bd75e 3 *
3f8c0df4 4 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
2a0bd75e
AO		 5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 *
10 * Trademarks are the property of their respective owners.
11 */
12
13#include <linux/delay.h>
5a0e3ad6 14#include <linux/slab.h>
2a0bd75e
AO		 15#include <linux/module.h>
16#include <linux/input.h>
89eec4d7 17#include <linux/input/mt.h>
2a0bd75e
AO		 18#include <linux/serio.h>
19#include <linux/libps2.h>
20#include "psmouse.h"
21#include "elantech.h"
22
d4ae84a8
DT		 23#define elantech_debug(fmt, ...) \
24 do { \
25 if (etd->debug) \
b5d21704
DT		 26 psmouse_printk(KERN_DEBUG, psmouse, \
27 fmt, ##__VA_ARGS__); \
2a0bd75e
AO		 28 } while (0)
29
30/*
31 * Send a Synaptics style sliced query command
32 */
33static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
34 unsigned char *param)
35{
36 if (psmouse_sliced_command(psmouse, c) ||
37 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
b5d21704 38 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
2a0bd75e
AO		 39 return -1;
40 }
41
42 return 0;
43}
44
b56b92a9
JD		 45/*
46 * V3 and later support this fast command
47 */
48static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
49 unsigned char *param)
50{
51 struct ps2dev *ps2dev = &psmouse->ps2dev;
52
53 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
54 ps2_command(ps2dev, NULL, c) ||
55 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
56 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
57 return -1;
58 }
59
60 return 0;
61}
62
2a0bd75e
AO		 63/*
64 * A retrying version of ps2_command
65 */
66static int elantech_ps2_command(struct psmouse *psmouse,
67 unsigned char *param, int command)
68{
69 struct ps2dev *ps2dev = &psmouse->ps2dev;
70 struct elantech_data *etd = psmouse->private;
71 int rc;
72 int tries = ETP_PS2_COMMAND_TRIES;
73
74 do {
75 rc = ps2_command(ps2dev, param, command);
76 if (rc == 0)
77 break;
78 tries--;
d4ae84a8
DT		 79 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
80 command, tries);
2a0bd75e
AO		 81 msleep(ETP_PS2_COMMAND_DELAY);
82 } while (tries > 0);
83
84 if (rc)
b5d21704 85 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
2a0bd75e
AO		 86
87 return rc;
88}
89
90/*
91 * Send an Elantech style special command to read a value from a register
92 */
93static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
94 unsigned char *val)
95{
96 struct elantech_data *etd = psmouse->private;
97 unsigned char param[3];
98 int rc = 0;
99
1dc6edec 100 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 101 return -1;
102
103 if (reg > 0x11 && reg < 0x20)
104 return -1;
105
106 switch (etd->hw_version) {
107 case 1:
108 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
109 psmouse_sliced_command(psmouse, reg) ||
110 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
111 rc = -1;
112 }
113 break;
114
115 case 2:
116 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
117 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
118 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
119 elantech_ps2_command(psmouse, NULL, reg) ||
120 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
121 rc = -1;
122 }
123 break;
28f49616 124
1dc6edec 125 case 3 ... 4:
28f49616
JD		 126 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
127 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
128 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
129 elantech_ps2_command(psmouse, NULL, reg) ||
130 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
131 rc = -1;
132 }
133 break;
2a0bd75e
AO		 134 }
135
136 if (rc)
b5d21704 137 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
1dc6edec 138 else if (etd->hw_version != 4)
2a0bd75e 139 *val = param[0];
1dc6edec
JD		 140 else
141 *val = param[1];
2a0bd75e
AO		 142
143 return rc;
144}
145
146/*
147 * Send an Elantech style special command to write a register with a value
148 */
149static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
150 unsigned char val)
151{
152 struct elantech_data *etd = psmouse->private;
153 int rc = 0;
154
1dc6edec 155 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 156 return -1;
157
158 if (reg > 0x11 && reg < 0x20)
159 return -1;
160
161 switch (etd->hw_version) {
162 case 1:
163 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
164 psmouse_sliced_command(psmouse, reg) ||
165 psmouse_sliced_command(psmouse, val) ||
166 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
167 rc = -1;
168 }
169 break;
170
171 case 2:
172 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
173 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
174 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
175 elantech_ps2_command(psmouse, NULL, reg) ||
176 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
177 elantech_ps2_command(psmouse, NULL, val) ||
178 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
179 rc = -1;
180 }
181 break;
28f49616
JD		 182
183 case 3:
184 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
185 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
186 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
187 elantech_ps2_command(psmouse, NULL, reg) ||
188 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
189 elantech_ps2_command(psmouse, NULL, val) ||
190 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
191 rc = -1;
192 }
193 break;
1dc6edec
JD		 194
195 case 4:
196 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
197 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
198 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
199 elantech_ps2_command(psmouse, NULL, reg) ||
200 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
201 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
202 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
203 elantech_ps2_command(psmouse, NULL, val) ||
204 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
205 rc = -1;
206 }
207 break;
2a0bd75e
AO		 208 }
209
210 if (rc)
b5d21704
DT		 211 psmouse_err(psmouse,
212 "failed to write register 0x%02x with value 0x%02x.\n",
213 reg, val);
2a0bd75e
AO		 214
215 return rc;
216}
217
218/*
219 * Dump a complete mouse movement packet to the syslog
220 */
b5d21704 221static void elantech_packet_dump(struct psmouse *psmouse)
2a0bd75e
AO		 222{
223 int i;
224
b5d21704
DT		 225 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
226 for (i = 0; i < psmouse->pktsize; i++)
227 printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
2a0bd75e
AO		 228 printk("]\n");
229}
230
231/*
232 * Interpret complete data packets and report absolute mode input events for
233 * hardware version 1. (4 byte packets)
234 */
235static void elantech_report_absolute_v1(struct psmouse *psmouse)
236{
237 struct input_dev *dev = psmouse->dev;
238 struct elantech_data *etd = psmouse->private;
239 unsigned char *packet = psmouse->packet;
240 int fingers;
241
504e8bee 242 if (etd->fw_version < 0x020000) {
e938fbfd
FR		 243 /*
244 * byte 0: D U p1 p2 1 p3 R L
245 * byte 1: f 0 th tw x9 x8 y9 y8
246 */
2a0bd75e
AO		 247 fingers = ((packet[1] & 0x80) >> 7) +
248 ((packet[1] & 0x30) >> 4);
249 } else {
e938fbfd
FR		 250 /*
251 * byte 0: n1 n0 p2 p1 1 p3 R L
252 * byte 1: 0 0 0 0 x9 x8 y9 y8
253 */
2a0bd75e
AO		 254 fingers = (packet[0] & 0xc0) >> 6;
255 }
256
3f8c0df4 257 if (etd->jumpy_cursor) {
7f29f17b
ÉP		 258 if (fingers != 1) {
259 etd->single_finger_reports = 0;
260 } else if (etd->single_finger_reports < 2) {
261 /* Discard first 2 reports of one finger, bogus */
262 etd->single_finger_reports++;
d4ae84a8 263 elantech_debug("discarding packet\n");
7f29f17b 264 return;
3f8c0df4
AO		 265 }
266 }
267
2a0bd75e
AO		 268 input_report_key(dev, BTN_TOUCH, fingers != 0);
269
e938fbfd
FR		 270 /*
271 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
272 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
273 */
2a0bd75e
AO		 274 if (fingers) {
275 input_report_abs(dev, ABS_X,
276 ((packet[1] & 0x0c) << 6) | packet[2]);
e938fbfd 277 input_report_abs(dev, ABS_Y,
230282a7 278 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
2a0bd75e
AO		 279 }
280
281 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
282 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
283 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
284 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
285 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
286
504e8bee 287 if (etd->fw_version < 0x020000 &&
230282a7 288 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 289 /* rocker up */
290 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
291 /* rocker down */
292 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
293 }
294
295 input_sync(dev);
296}
297
89eec4d7
ÉP		 298static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
299 unsigned int x, unsigned int y)
300{
301 input_mt_slot(dev, slot);
302 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
303 if (active) {
304 input_report_abs(dev, ABS_MT_POSITION_X, x);
305 input_report_abs(dev, ABS_MT_POSITION_Y, y);
306 }
307}
308
309/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
310static void elantech_report_semi_mt_data(struct input_dev *dev,
311 unsigned int num_fingers,
312 unsigned int x1, unsigned int y1,
313 unsigned int x2, unsigned int y2)
314{
315 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
316 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
317}
318
2a0bd75e
AO		 319/*
320 * Interpret complete data packets and report absolute mode input events for
321 * hardware version 2. (6 byte packets)
322 */
323static void elantech_report_absolute_v2(struct psmouse *psmouse)
324{
f941c705 325 struct elantech_data *etd = psmouse->private;
2a0bd75e
AO		 326 struct input_dev *dev = psmouse->dev;
327 unsigned char *packet = psmouse->packet;
461a7917
JD		 328 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
329 unsigned int width = 0, pres = 0;
2a0bd75e
AO		 330
331 /* byte 0: n1 n0 . . . . R L */
332 fingers = (packet[0] & 0xc0) >> 6;
2a0bd75e
AO		 333
334 switch (fingers) {
22462d9f
ÉP		 335 case 3:
336 /*
337 * Same as one finger, except report of more than 3 fingers:
338 * byte 3: n4 . w1 w0 . . . .
339 */
340 if (packet[3] & 0x80)
341 fingers = 4;
342 /* pass through... */
2a0bd75e 343 case 1:
e938fbfd 344 /*
11559619 345 * byte 1: . . . . x11 x10 x9 x8
e938fbfd
FR		 346 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
347 */
11559619 348 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
e938fbfd 349 /*
11559619 350 * byte 4: . . . . y11 y10 y9 y8
e938fbfd
FR		 351 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
352 */
230282a7 353 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
89eec4d7 354
f941c705
ÉP		 355 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
356 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
2a0bd75e
AO		 357 break;
358
359 case 2:
e938fbfd
FR		 360 /*
361 * The coordinate of each finger is reported separately
362 * with a lower resolution for two finger touches:
363 * byte 0: . . ay8 ax8 . . . .
364 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
365 */
461a7917 366 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
2a0bd75e 367 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
230282a7 368 y1 = etd->y_max -
461a7917 369 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
e938fbfd
FR		 370 /*
371 * byte 3: . . by8 bx8 . . . .
372 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
373 */
461a7917 374 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
2a0bd75e 375 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
230282a7 376 y2 = etd->y_max -
461a7917 377 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
f941c705
ÉP		 378
379 /* Unknown so just report sensible values */
380 pres = 127;
381 width = 7;
2a0bd75e
AO		 382 break;
383 }
384
461a7917
JD		 385 input_report_key(dev, BTN_TOUCH, fingers != 0);
386 if (fingers != 0) {
387 input_report_abs(dev, ABS_X, x1);
388 input_report_abs(dev, ABS_Y, y1);
389 }
89eec4d7 390 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
2a0bd75e
AO		 391 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
392 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
393 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
22462d9f 394 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
2a0bd75e
AO		 395 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
396 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
f941c705
ÉP		 397 if (etd->reports_pressure) {
398 input_report_abs(dev, ABS_PRESSURE, pres);
399 input_report_abs(dev, ABS_TOOL_WIDTH, width);
400 }
2a0bd75e
AO		 401
402 input_sync(dev);
403}
404
28f49616
JD		 405/*
406 * Interpret complete data packets and report absolute mode input events for
407 * hardware version 3. (12 byte packets for two fingers)
408 */
409static void elantech_report_absolute_v3(struct psmouse *psmouse,
410 int packet_type)
411{
412 struct input_dev *dev = psmouse->dev;
413 struct elantech_data *etd = psmouse->private;
414 unsigned char *packet = psmouse->packet;
415 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
416 unsigned int width = 0, pres = 0;
417
418 /* byte 0: n1 n0 . . . . R L */
419 fingers = (packet[0] & 0xc0) >> 6;
420
421 switch (fingers) {
422 case 3:
423 case 1:
424 /*
425 * byte 1: . . . . x11 x10 x9 x8
426 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
427 */
428 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
429 /*
430 * byte 4: . . . . y11 y10 y9 y8
431 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
432 */
433 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
434 break;
435
436 case 2:
437 if (packet_type == PACKET_V3_HEAD) {
438 /*
439 * byte 1: . . . . ax11 ax10 ax9 ax8
440 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
441 */
1dc6edec 442 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
28f49616
JD		 443 /*
444 * byte 4: . . . . ay11 ay10 ay9 ay8
445 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
446 */
1dc6edec 447 etd->mt[0].y = etd->y_max -
28f49616
JD		 448 (((packet[4] & 0x0f) << 8) | packet[5]);
449 /*
450 * wait for next packet
451 */
452 return;
453 }
454
455 /* packet_type == PACKET_V3_TAIL */
1dc6edec
JD		 456 x1 = etd->mt[0].x;
457 y1 = etd->mt[0].y;
28f49616
JD		 458 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
459 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
460 break;
461 }
462
463 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
464 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
465
466 input_report_key(dev, BTN_TOUCH, fingers != 0);
467 if (fingers != 0) {
468 input_report_abs(dev, ABS_X, x1);
469 input_report_abs(dev, ABS_Y, y1);
470 }
471 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
472 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
473 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
474 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
475 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
476 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
477 input_report_abs(dev, ABS_PRESSURE, pres);
478 input_report_abs(dev, ABS_TOOL_WIDTH, width);
479
480 input_sync(dev);
481}
482
1dc6edec
JD		 483static void elantech_input_sync_v4(struct psmouse *psmouse)
484{
485 struct input_dev *dev = psmouse->dev;
486 unsigned char *packet = psmouse->packet;
487
488 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
1dc6edec
JD		 489 input_mt_report_pointer_emulation(dev, true);
490 input_sync(dev);
491}
492
493static void process_packet_status_v4(struct psmouse *psmouse)
494{
495 struct input_dev *dev = psmouse->dev;
496 unsigned char *packet = psmouse->packet;
497 unsigned fingers;
498 int i;
499
500 /* notify finger state change */
501 fingers = packet[1] & 0x1f;
502 for (i = 0; i < ETP_MAX_FINGERS; i++) {
503 if ((fingers & (1 << i)) == 0) {
504 input_mt_slot(dev, i);
505 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
506 }
507 }
508
509 elantech_input_sync_v4(psmouse);
510}
511
512static void process_packet_head_v4(struct psmouse *psmouse)
513{
514 struct input_dev *dev = psmouse->dev;
515 struct elantech_data *etd = psmouse->private;
516 unsigned char *packet = psmouse->packet;
517 int id = ((packet[3] & 0xe0) >> 5) - 1;
518 int pres, traces;
519
520 if (id < 0)
521 return;
522
523 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
524 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
525 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
526 traces = (packet[0] & 0xf0) >> 4;
527
528 input_mt_slot(dev, id);
529 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
530
531 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
532 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
533 input_report_abs(dev, ABS_MT_PRESSURE, pres);
534 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
535 /* report this for backwards compatibility */
536 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
537
538 elantech_input_sync_v4(psmouse);
539}
540
541static void process_packet_motion_v4(struct psmouse *psmouse)
542{
543 struct input_dev *dev = psmouse->dev;
544 struct elantech_data *etd = psmouse->private;
545 unsigned char *packet = psmouse->packet;
546 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
547 int id, sid;
548
549 id = ((packet[0] & 0xe0) >> 5) - 1;
550 if (id < 0)
551 return;
552
553 sid = ((packet[3] & 0xe0) >> 5) - 1;
554 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
555 /*
556 * Motion packets give us the delta of x, y values of specific fingers,
557 * but in two's complement. Let the compiler do the conversion for us.
558 * Also _enlarge_ the numbers to int, in case of overflow.
559 */
560 delta_x1 = (signed char)packet[1];
561 delta_y1 = (signed char)packet[2];
562 delta_x2 = (signed char)packet[4];
563 delta_y2 = (signed char)packet[5];
564
565 etd->mt[id].x += delta_x1 * weight;
566 etd->mt[id].y -= delta_y1 * weight;
567 input_mt_slot(dev, id);
568 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
569 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
570
571 if (sid >= 0) {
572 etd->mt[sid].x += delta_x2 * weight;
573 etd->mt[sid].y -= delta_y2 * weight;
574 input_mt_slot(dev, sid);
575 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
576 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
577 }
578
579 elantech_input_sync_v4(psmouse);
580}
581
582static void elantech_report_absolute_v4(struct psmouse *psmouse,
583 int packet_type)
584{
585 switch (packet_type) {
586 case PACKET_V4_STATUS:
587 process_packet_status_v4(psmouse);
588 break;
589
590 case PACKET_V4_HEAD:
591 process_packet_head_v4(psmouse);
592 break;
593
594 case PACKET_V4_MOTION:
595 process_packet_motion_v4(psmouse);
596 break;
597
598 case PACKET_UNKNOWN:
599 default:
600 /* impossible to get here */
601 break;
602 }
603}
604
7894f21b 605static int elantech_packet_check_v1(struct psmouse *psmouse)
2a0bd75e
AO		 606{
607 struct elantech_data *etd = psmouse->private;
608 unsigned char *packet = psmouse->packet;
609 unsigned char p1, p2, p3;
610
611 /* Parity bits are placed differently */
504e8bee 612 if (etd->fw_version < 0x020000) {
2a0bd75e
AO		 613 /* byte 0: D U p1 p2 1 p3 R L */
614 p1 = (packet[0] & 0x20) >> 5;
615 p2 = (packet[0] & 0x10) >> 4;
616 } else {
617 /* byte 0: n1 n0 p2 p1 1 p3 R L */
618 p1 = (packet[0] & 0x10) >> 4;
619 p2 = (packet[0] & 0x20) >> 5;
620 }
621
622 p3 = (packet[0] & 0x04) >> 2;
623
624 return etd->parity[packet[1]] == p1 &&
625 etd->parity[packet[2]] == p2 &&
626 etd->parity[packet[3]] == p3;
627}
628
84a90b61
JD		 629static int elantech_debounce_check_v2(struct psmouse *psmouse)
630{
631 /*
632 * When we encounter packet that matches this exactly, it means the
633 * hardware is in debounce status. Just ignore the whole packet.
634 */
635 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
636 unsigned char *packet = psmouse->packet;
637
638 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
639}
640
7894f21b
JD		 641static int elantech_packet_check_v2(struct psmouse *psmouse)
642{
643 struct elantech_data *etd = psmouse->private;
644 unsigned char *packet = psmouse->packet;
645
646 /*
647 * V2 hardware has two flavors. Older ones that do not report pressure,
648 * and newer ones that reports pressure and width. With newer ones, all
649 * packets (1, 2, 3 finger touch) have the same constant bits. With
650 * older ones, 1/3 finger touch packets and 2 finger touch packets
651 * have different constant bits.
652 * With all three cases, if the constant bits are not exactly what I
653 * expected, I consider them invalid.
654 */
655 if (etd->reports_pressure)
656 return (packet[0] & 0x0c) == 0x04 &&
657 (packet[3] & 0x0f) == 0x02;
658
659 if ((packet[0] & 0xc0) == 0x80)
660 return (packet[0] & 0x0c) == 0x0c &&
661 (packet[3] & 0x0e) == 0x08;
662
663 return (packet[0] & 0x3c) == 0x3c &&
664 (packet[1] & 0xf0) == 0x00 &&
665 (packet[3] & 0x3e) == 0x38 &&
666 (packet[4] & 0xf0) == 0x00;
667}
668
28f49616
JD		 669/*
670 * We check the constant bits to determine what packet type we get,
1dc6edec 671 * so packet checking is mandatory for v3 and later hardware.
28f49616
JD		 672 */
673static int elantech_packet_check_v3(struct psmouse *psmouse)
674{
acc0444b 675 struct elantech_data *etd = psmouse->private;
28f49616
JD		 676 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
677 unsigned char *packet = psmouse->packet;
678
679 /*
680 * check debounce first, it has the same signature in byte 0
681 * and byte 3 as PACKET_V3_HEAD.
682 */
683 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
684 return PACKET_DEBOUNCE;
685
acc0444b
MD		 686 /*
687 * If the hardware flag 'crc_enabled' is set the packets have
688 * different signatures.
689 */
690 if (etd->crc_enabled) {
691 if ((packet[3] & 0x09) == 0x08)
692 return PACKET_V3_HEAD;
693
694 if ((packet[3] & 0x09) == 0x09)
695 return PACKET_V3_TAIL;
696 } else {
697 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
698 return PACKET_V3_HEAD;
28f49616 699
acc0444b
MD		 700 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
701 return PACKET_V3_TAIL;
702 }
28f49616
JD		 703
704 return PACKET_UNKNOWN;
705}
706
1dc6edec
JD		 707static int elantech_packet_check_v4(struct psmouse *psmouse)
708{
acc0444b 709 struct elantech_data *etd = psmouse->private;
1dc6edec 710 unsigned char *packet = psmouse->packet;
9eebed7d 711 unsigned char packet_type = packet[3] & 0x03;
acc0444b
MD		 712 bool sanity_check;
713
714 /*
715 * Sanity check based on the constant bits of a packet.
716 * The constant bits change depending on the value of
717 * the hardware flag 'crc_enabled' but are the same for
718 * every packet, regardless of the type.
719 */
720 if (etd->crc_enabled)
721 sanity_check = ((packet[3] & 0x08) == 0x00);
722 else
723 sanity_check = ((packet[0] & 0x0c) == 0x04 &&
724 (packet[3] & 0x1c) == 0x10);
725
726 if (!sanity_check)
727 return PACKET_UNKNOWN;
1dc6edec 728
9eebed7d
MD		 729 switch (packet_type) {
730 case 0:
731 return PACKET_V4_STATUS;
732
733 case 1:
1dc6edec
JD		 734 return PACKET_V4_HEAD;
735
9eebed7d 736 case 2:
1dc6edec 737 return PACKET_V4_MOTION;
9eebed7d 738 }
1dc6edec
JD		 739
740 return PACKET_UNKNOWN;
741}
742
2a0bd75e
AO		 743/*
744 * Process byte stream from mouse and handle complete packets
745 */
746static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
747{
748 struct elantech_data *etd = psmouse->private;
28f49616 749 int packet_type;
2a0bd75e
AO		 750
751 if (psmouse->pktcnt < psmouse->pktsize)
752 return PSMOUSE_GOOD_DATA;
753
754 if (etd->debug > 1)
b5d21704 755 elantech_packet_dump(psmouse);
2a0bd75e
AO		 756
757 switch (etd->hw_version) {
758 case 1:
7894f21b 759 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
2a0bd75e
AO		 760 return PSMOUSE_BAD_DATA;
761
762 elantech_report_absolute_v1(psmouse);
763 break;
764
765 case 2:
84a90b61
JD		 766 /* ignore debounce */
767 if (elantech_debounce_check_v2(psmouse))
768 return PSMOUSE_FULL_PACKET;
769
7894f21b
JD		 770 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
771 return PSMOUSE_BAD_DATA;
772
2a0bd75e
AO		 773 elantech_report_absolute_v2(psmouse);
774 break;
28f49616
JD		 775
776 case 3:
777 packet_type = elantech_packet_check_v3(psmouse);
778 /* ignore debounce */
779 if (packet_type == PACKET_DEBOUNCE)
780 return PSMOUSE_FULL_PACKET;
781
782 if (packet_type == PACKET_UNKNOWN)
783 return PSMOUSE_BAD_DATA;
784
785 elantech_report_absolute_v3(psmouse, packet_type);
786 break;
1dc6edec
JD		 787
788 case 4:
789 packet_type = elantech_packet_check_v4(psmouse);
790 if (packet_type == PACKET_UNKNOWN)
791 return PSMOUSE_BAD_DATA;
792
793 elantech_report_absolute_v4(psmouse, packet_type);
794 break;
2a0bd75e
AO		 795 }
796
797 return PSMOUSE_FULL_PACKET;
798}
799
800/*
801 * Put the touchpad into absolute mode
802 */
803static int elantech_set_absolute_mode(struct psmouse *psmouse)
804{
805 struct elantech_data *etd = psmouse->private;
806 unsigned char val;
807 int tries = ETP_READ_BACK_TRIES;
808 int rc = 0;
809
810 switch (etd->hw_version) {
811 case 1:
812 etd->reg_10 = 0x16;
813 etd->reg_11 = 0x8f;
814 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
815 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
816 rc = -1;
817 }
818 break;
819
820 case 2:
821 /* Windows driver values */
822 etd->reg_10 = 0x54;
823 etd->reg_11 = 0x88; /* 0x8a */
824 etd->reg_21 = 0x60; /* 0x00 */
825 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
826 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
827 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
828 rc = -1;
2a0bd75e 829 }
28f49616
JD		 830 break;
831
832 case 3:
833 etd->reg_10 = 0x0b;
834 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
835 rc = -1;
836
837 break;
1dc6edec
JD		 838
839 case 4:
840 etd->reg_07 = 0x01;
841 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
842 rc = -1;
843
844 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
b2546df6
AO		 845 }
846
847 if (rc == 0) {
2a0bd75e 848 /*
b2546df6
AO		 849 * Read back reg 0x10. For hardware version 1 we must make
850 * sure the absolute mode bit is set. For hardware version 2
b5d21704 851 * the touchpad is probably initializing and not ready until
b2546df6 852 * we read back the value we just wrote.
2a0bd75e
AO		 853 */
854 do {
855 rc = elantech_read_reg(psmouse, 0x10, &val);
856 if (rc == 0)
857 break;
858 tries--;
d4ae84a8 859 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 860 msleep(ETP_READ_BACK_DELAY);
861 } while (tries > 0);
b2546df6
AO		 862
863 if (rc) {
b5d21704
DT		 864 psmouse_err(psmouse,
865 "failed to read back register 0x10.\n");
b2546df6
AO		 866 } else if (etd->hw_version == 1 &&
867 !(val & ETP_R10_ABSOLUTE_MODE)) {
b5d21704
DT		 868 psmouse_err(psmouse,
869 "touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 870 rc = -1;
871 }
2a0bd75e
AO		 872 }
873
1dc6edec 874 skip_readback_reg_10:
2a0bd75e 875 if (rc)
b5d21704 876 psmouse_err(psmouse, "failed to initialise registers.\n");
2a0bd75e
AO		 877
878 return rc;
879}
880
28f49616
JD		 881static int elantech_set_range(struct psmouse *psmouse,
882 unsigned int *x_min, unsigned int *y_min,
1dc6edec
JD		 883 unsigned int *x_max, unsigned int *y_max,
884 unsigned int *width)
230282a7
JD		 885{
886 struct elantech_data *etd = psmouse->private;
28f49616 887 unsigned char param[3];
1dc6edec 888 unsigned char traces;
230282a7
JD		 889
890 switch (etd->hw_version) {
891 case 1:
892 *x_min = ETP_XMIN_V1;
893 *y_min = ETP_YMIN_V1;
894 *x_max = ETP_XMAX_V1;
895 *y_max = ETP_YMAX_V1;
896 break;
897
898 case 2:
899 if (etd->fw_version == 0x020800 ||
900 etd->fw_version == 0x020b00 ||
901 etd->fw_version == 0x020030) {
902 *x_min = ETP_XMIN_V2;
903 *y_min = ETP_YMIN_V2;
904 *x_max = ETP_XMAX_V2;
905 *y_max = ETP_YMAX_V2;
906 } else {
84a90b61
JD		 907 int i;
908 int fixed_dpi;
909
230282a7
JD		 910 i = (etd->fw_version > 0x020800 &&
911 etd->fw_version < 0x020900) ? 1 : 2;
84a90b61 912
b56b92a9 913 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
84a90b61
JD		 914 return -1;
915
916 fixed_dpi = param[1] & 0x10;
917
918 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
b56b92a9 919 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
84a90b61
JD		 920 return -1;
921
922 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
923 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
924 } else if (etd->fw_version == 0x040216) {
925 *x_max = 819;
926 *y_max = 405;
927 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
928 *x_max = 900;
929 *y_max = 500;
930 } else {
931 *x_max = (etd->capabilities[1] - i) * 64;
932 *y_max = (etd->capabilities[2] - i) * 64;
933 }
230282a7
JD		 934 }
935 break;
28f49616
JD		 936
937 case 3:
b56b92a9 938 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
28f49616
JD		 939 return -1;
940
941 *x_max = (0x0f & param[0]) << 8 | param[1];
942 *y_max = (0xf0 & param[0]) << 4 | param[2];
943 break;
1dc6edec
JD		 944
945 case 4:
b56b92a9 946 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1dc6edec
JD		 947 return -1;
948
949 *x_max = (0x0f & param[0]) << 8 | param[1];
950 *y_max = (0xf0 & param[0]) << 4 | param[2];
951 traces = etd->capabilities[1];
952 if ((traces < 2) || (traces > *x_max))
953 return -1;
954
955 *width = *x_max / (traces - 1);
956 break;
230282a7 957 }
28f49616
JD		 958
959 return 0;
230282a7
JD		 960}
961
3d95fd6a
JD		 962/*
963 * (value from firmware) * 10 + 790 = dpi
964 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
965 */
966static unsigned int elantech_convert_res(unsigned int val)
967{
968 return (val * 10 + 790) * 10 / 254;
969}
970
971static int elantech_get_resolution_v4(struct psmouse *psmouse,
972 unsigned int *x_res,
973 unsigned int *y_res)
974{
975 unsigned char param[3];
976
977 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
978 return -1;
979
980 *x_res = elantech_convert_res(param[1] & 0x0f);
981 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
982
983 return 0;
984}
985
2a0bd75e
AO		 986/*
987 * Set the appropriate event bits for the input subsystem
988 */
28f49616 989static int elantech_set_input_params(struct psmouse *psmouse)
2a0bd75e
AO		 990{
991 struct input_dev *dev = psmouse->dev;
992 struct elantech_data *etd = psmouse->private;
1dc6edec 993 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
3d95fd6a 994 unsigned int x_res = 0, y_res = 0;
230282a7 995
1dc6edec 996 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
28f49616 997 return -1;
2a0bd75e 998
e3dde4fb 999 __set_bit(INPUT_PROP_POINTER, dev->propbit);
2a0bd75e
AO		 1000 __set_bit(EV_KEY, dev->evbit);
1001 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 1002 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 1003
1004 __set_bit(BTN_LEFT, dev->keybit);
1005 __set_bit(BTN_RIGHT, dev->keybit);
1006
1007 __set_bit(BTN_TOUCH, dev->keybit);
1008 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1009 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1010 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1011
1012 switch (etd->hw_version) {
1013 case 1:
1014 /* Rocker button */
504e8bee 1015 if (etd->fw_version < 0x020000 &&
230282a7 1016 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 1017 __set_bit(BTN_FORWARD, dev->keybit);
1018 __set_bit(BTN_BACK, dev->keybit);
1019 }
230282a7
JD		 1020 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1021 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 1022 break;
1023
1024 case 2:
22462d9f 1025 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
28f49616
JD		 1026 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1027 /* fall through */
1028 case 3:
230282a7
JD		 1029 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1030 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 1031 if (etd->reports_pressure) {
1032 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1033 ETP_PMAX_V2, 0, 0);
1034 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1035 ETP_WMAX_V2, 0, 0);
1036 }
b4adbbef 1037 input_mt_init_slots(dev, 2, 0);
230282a7
JD		 1038 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1039 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e 1040 break;
1dc6edec
JD		 1041
1042 case 4:
3d95fd6a
JD		 1043 if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
1044 /*
1045 * if query failed, print a warning and leave the values
1046 * zero to resemble synaptics.c behavior.
1047 */
1048 psmouse_warn(psmouse, "couldn't query resolution data.\n");
1049 }
e3dde4fb
JD		 1050 /* v4 is clickpad, with only one button. */
1051 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1052 __clear_bit(BTN_RIGHT, dev->keybit);
1dc6edec
JD		 1053 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1054 /* For X to recognize me as touchpad. */
1055 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1056 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
3d95fd6a
JD		 1057 input_abs_set_res(dev, ABS_X, x_res);
1058 input_abs_set_res(dev, ABS_Y, y_res);
1dc6edec
JD		 1059 /*
1060 * range of pressure and width is the same as v2,
1061 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1062 */
1063 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1064 ETP_PMAX_V2, 0, 0);
1065 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1066 ETP_WMAX_V2, 0, 0);
1067 /* Multitouch capable pad, up to 5 fingers. */
b4adbbef 1068 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1dc6edec
JD		 1069 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1070 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
3d95fd6a
JD		 1071 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
1072 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
1dc6edec
JD		 1073 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1074 ETP_PMAX_V2, 0, 0);
1075 /*
1076 * The firmware reports how many trace lines the finger spans,
1077 * convert to surface unit as Protocol-B requires.
1078 */
1079 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1080 ETP_WMAX_V2 * width, 0, 0);
1081 break;
2a0bd75e 1082 }
230282a7
JD		 1083
1084 etd->y_max = y_max;
1dc6edec 1085 etd->width = width;
28f49616
JD		 1086
1087 return 0;
2a0bd75e
AO		 1088}
1089
1090struct elantech_attr_data {
1091 size_t field_offset;
1092 unsigned char reg;
1093};
1094
1095/*
1096 * Display a register value by reading a sysfs entry
1097 */
1098static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1099 char *buf)
1100{
1101 struct elantech_data *etd = psmouse->private;
1102 struct elantech_attr_data *attr = data;
1103 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1104 int rc = 0;
1105
1106 if (attr->reg)
1107 rc = elantech_read_reg(psmouse, attr->reg, reg);
1108
1109 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1110}
1111
1112/*
1113 * Write a register value by writing a sysfs entry
1114 */
1115static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1116 void *data, const char *buf, size_t count)
1117{
1118 struct elantech_data *etd = psmouse->private;
1119 struct elantech_attr_data *attr = data;
1120 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
76496e7a 1121 unsigned char value;
2a0bd75e
AO		 1122 int err;
1123
76496e7a 1124 err = kstrtou8(buf, 16, &value);
2a0bd75e
AO		 1125 if (err)
1126 return err;
1127
2a0bd75e
AO		 1128 /* Do we need to preserve some bits for version 2 hardware too? */
1129 if (etd->hw_version == 1) {
1130 if (attr->reg == 0x10)
1131 /* Force absolute mode always on */
1132 value |= ETP_R10_ABSOLUTE_MODE;
1133 else if (attr->reg == 0x11)
1134 /* Force 4 byte mode always on */
1135 value |= ETP_R11_4_BYTE_MODE;
1136 }
1137
1138 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1139 *reg = value;
1140
1141 return count;
1142}
1143
1144#define ELANTECH_INT_ATTR(_name, _register) \
1145 static struct elantech_attr_data elantech_attr_##_name = { \
1146 .field_offset = offsetof(struct elantech_data, _name), \
1147 .reg = _register, \
1148 }; \
1149 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1150 &elantech_attr_##_name, \
1151 elantech_show_int_attr, \
1152 elantech_set_int_attr)
1153
1dc6edec 1154ELANTECH_INT_ATTR(reg_07, 0x07);
2a0bd75e
AO		 1155ELANTECH_INT_ATTR(reg_10, 0x10);
1156ELANTECH_INT_ATTR(reg_11, 0x11);
1157ELANTECH_INT_ATTR(reg_20, 0x20);
1158ELANTECH_INT_ATTR(reg_21, 0x21);
1159ELANTECH_INT_ATTR(reg_22, 0x22);
1160ELANTECH_INT_ATTR(reg_23, 0x23);
1161ELANTECH_INT_ATTR(reg_24, 0x24);
1162ELANTECH_INT_ATTR(reg_25, 0x25);
1163ELANTECH_INT_ATTR(reg_26, 0x26);
1164ELANTECH_INT_ATTR(debug, 0);
1165ELANTECH_INT_ATTR(paritycheck, 0);
1166
1167static struct attribute *elantech_attrs[] = {
1dc6edec 1168 &psmouse_attr_reg_07.dattr.attr,
2a0bd75e
AO		 1169 &psmouse_attr_reg_10.dattr.attr,
1170 &psmouse_attr_reg_11.dattr.attr,
1171 &psmouse_attr_reg_20.dattr.attr,
1172 &psmouse_attr_reg_21.dattr.attr,
1173 &psmouse_attr_reg_22.dattr.attr,
1174 &psmouse_attr_reg_23.dattr.attr,
1175 &psmouse_attr_reg_24.dattr.attr,
1176 &psmouse_attr_reg_25.dattr.attr,
1177 &psmouse_attr_reg_26.dattr.attr,
1178 &psmouse_attr_debug.dattr.attr,
1179 &psmouse_attr_paritycheck.dattr.attr,
1180 NULL
1181};
1182
1183static struct attribute_group elantech_attr_group = {
1184 .attrs = elantech_attrs,
1185};
1186
a083632e
DT		 1187static bool elantech_is_signature_valid(const unsigned char *param)
1188{
1189 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1190 int i;
1191
1192 if (param[0] == 0)
1193 return false;
1194
1195 if (param[1] == 0)
1196 return true;
1197
1198 for (i = 0; i < ARRAY_SIZE(rates); i++)
1199 if (param[2] == rates[i])
1200 return false;
1201
1202 return true;
1203}
1204
2a0bd75e
AO		 1205/*
1206 * Use magic knock to detect Elantech touchpad
1207 */
b7802c5c 1208int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 1209{
1210 struct ps2dev *ps2dev = &psmouse->ps2dev;
1211 unsigned char param[3];
1212
1213 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1214
1215 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1216 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1217 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1218 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1219 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
b5d21704 1220 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
2a0bd75e
AO		 1221 return -1;
1222 }
1223
1224 /*
1225 * Report this in case there are Elantech models that use a different
1226 * set of magic numbers
1227 */
28f49616
JD		 1228 if (param[0] != 0x3c || param[1] != 0x03 ||
1229 (param[2] != 0xc8 && param[2] != 0x00)) {
b5d21704
DT		 1230 psmouse_dbg(psmouse,
1231 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1232 param[0], param[1], param[2]);
9ab7b25e
AO		 1233 return -1;
1234 }
1235
1236 /*
1237 * Query touchpad's firmware version and see if it reports known
1238 * value to avoid mis-detection. Logitech mice are known to respond
1239 * to Elantech magic knock and there might be more.
1240 */
1241 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
b5d21704 1242 psmouse_dbg(psmouse, "failed to query firmware version.\n");
9ab7b25e
AO		 1243 return -1;
1244 }
1245
b5d21704
DT		 1246 psmouse_dbg(psmouse,
1247 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1248 param[0], param[1], param[2]);
9ab7b25e 1249
a083632e 1250 if (!elantech_is_signature_valid(param)) {
b5d21704
DT		 1251 psmouse_dbg(psmouse,
1252 "Probably not a real Elantech touchpad. Aborting.\n");
4af61e90 1253 return -1;
2a0bd75e
AO		 1254 }
1255
1256 if (set_properties) {
1257 psmouse->vendor = "Elantech";
1258 psmouse->name = "Touchpad";
1259 }
1260
1261 return 0;
1262}
1263
1264/*
1265 * Clean up sysfs entries when disconnecting
1266 */
1267static void elantech_disconnect(struct psmouse *psmouse)
1268{
1269 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1270 &elantech_attr_group);
1271 kfree(psmouse->private);
1272 psmouse->private = NULL;
1273}
1274
1275/*
1276 * Put the touchpad back into absolute mode when reconnecting
1277 */
1278static int elantech_reconnect(struct psmouse *psmouse)
1279{
a67ada7a
JD		 1280 psmouse_reset(psmouse);
1281
2a0bd75e
AO		 1282 if (elantech_detect(psmouse, 0))
1283 return -1;
1284
1285 if (elantech_set_absolute_mode(psmouse)) {
b5d21704
DT		 1286 psmouse_err(psmouse,
1287 "failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 1288 return -1;
1289 }
1290
1291 return 0;
1292}
1293
3c8bbb95
JD		 1294/*
1295 * determine hardware version and set some properties according to it.
1296 */
28f49616 1297static int elantech_set_properties(struct elantech_data *etd)
3c8bbb95 1298{
3940d618 1299 /* This represents the version of IC body. */
1dc6edec
JD		 1300 int ver = (etd->fw_version & 0x0f0000) >> 16;
1301
3940d618 1302 /* Early version of Elan touchpads doesn't obey the rule. */
3c8bbb95
JD		 1303 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1304 etd->hw_version = 1;
3940d618
JD		 1305 else {
1306 switch (ver) {
1307 case 2:
1308 case 4:
1309 etd->hw_version = 2;
1310 break;
1311 case 5:
1312 etd->hw_version = 3;
1313 break;
1314 case 6:
9eebed7d 1315 case 7:
9cb80b96 1316 case 8:
3940d618
JD		 1317 etd->hw_version = 4;
1318 break;
1319 default:
1320 return -1;
1321 }
1322 }
3c8bbb95 1323
b56b92a9
JD		 1324 /* decide which send_cmd we're gonna use early */
1325 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
1326 synaptics_send_cmd;
1327
1328 /* Turn on packet checking by default */
3c8bbb95
JD		 1329 etd->paritycheck = 1;
1330
1331 /*
1332 * This firmware suffers from misreporting coordinates when
1333 * a touch action starts causing the mouse cursor or scrolled page
1334 * to jump. Enable a workaround.
1335 */
1336 etd->jumpy_cursor =
1337 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1338
28f49616 1339 if (etd->hw_version > 1) {
3c8bbb95
JD		 1340 /* For now show extra debug information */
1341 etd->debug = 1;
1342
1343 if (etd->fw_version >= 0x020800)
1344 etd->reports_pressure = true;
1345 }
28f49616 1346
acc0444b
MD		 1347 /*
1348 * The signatures of v3 and v4 packets change depending on the
1349 * value of this hardware flag.
1350 */
1351 etd->crc_enabled = ((etd->fw_version & 0x4000) == 0x4000);
1352
28f49616 1353 return 0;
3c8bbb95
JD		 1354}
1355
2a0bd75e
AO		 1356/*
1357 * Initialize the touchpad and create sysfs entries
1358 */
1359int elantech_init(struct psmouse *psmouse)
1360{
1361 struct elantech_data *etd;
1362 int i, error;
1363 unsigned char param[3];
1364
9ab7b25e 1365 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 1366 if (!etd)
6792cbbb 1367 return -ENOMEM;
2a0bd75e 1368
a67ada7a
JD		 1369 psmouse_reset(psmouse);
1370
2a0bd75e
AO		 1371 etd->parity[0] = 1;
1372 for (i = 1; i < 256; i++)
1373 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1374
1375 /*
9ab7b25e 1376 * Do the version query again so we can store the result
2a0bd75e
AO		 1377 */
1378 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
b5d21704 1379 psmouse_err(psmouse, "failed to query firmware version.\n");
2a0bd75e
AO		 1380 goto init_fail;
1381 }
504e8bee 1382 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
28f49616
JD		 1383
1384 if (elantech_set_properties(etd)) {
b5d21704 1385 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
28f49616
JD		 1386 goto init_fail;
1387 }
b5d21704
DT		 1388 psmouse_info(psmouse,
1389 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1390 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 1391
b56b92a9 1392 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
230282a7 1393 etd->capabilities)) {
b5d21704 1394 psmouse_err(psmouse, "failed to query capabilities.\n");
2a0bd75e
AO		 1395 goto init_fail;
1396 }
b5d21704
DT		 1397 psmouse_info(psmouse,
1398 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1399 etd->capabilities[0], etd->capabilities[1],
1400 etd->capabilities[2]);
2a0bd75e
AO		 1401
1402 if (elantech_set_absolute_mode(psmouse)) {
b5d21704
DT		 1403 psmouse_err(psmouse,
1404 "failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 1405 goto init_fail;
1406 }
1407
28f49616 1408 if (elantech_set_input_params(psmouse)) {
b5d21704 1409 psmouse_err(psmouse, "failed to query touchpad range.\n");
28f49616
JD		 1410 goto init_fail;
1411 }
2a0bd75e
AO		 1412
1413 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1414 &elantech_attr_group);
1415 if (error) {
b5d21704
DT		 1416 psmouse_err(psmouse,
1417 "failed to create sysfs attributes, error: %d.\n",
1418 error);
2a0bd75e
AO		 1419 goto init_fail;
1420 }
1421
1422 psmouse->protocol_handler = elantech_process_byte;
1423 psmouse->disconnect = elantech_disconnect;
1424 psmouse->reconnect = elantech_reconnect;
28f49616 1425 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
2a0bd75e
AO		 1426
1427 return 0;
1428
1429 init_fail:
1430 kfree(etd);
1431 return -1;
1432}
Linux 6.x block layer and io_uring tree(s)