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Input: edt-ft5x06 - fix an i2c write for M09 support
[deliverable/linux.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>
36189cc3 14#include <linux/dmi.h>
5a0e3ad6 15#include <linux/slab.h>
2a0bd75e
AO		 16#include <linux/module.h>
17#include <linux/input.h>
89eec4d7 18#include <linux/input/mt.h>
2a0bd75e
AO		 19#include <linux/serio.h>
20#include <linux/libps2.h>
21#include "psmouse.h"
22#include "elantech.h"
23
d4ae84a8
DT		 24#define elantech_debug(fmt, ...) \
25 do { \
26 if (etd->debug) \
b5d21704
DT		 27 psmouse_printk(KERN_DEBUG, psmouse, \
28 fmt, ##__VA_ARGS__); \
2a0bd75e
AO		 29 } while (0)
30
31/*
32 * Send a Synaptics style sliced query command
33 */
34static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
35 unsigned char *param)
36{
37 if (psmouse_sliced_command(psmouse, c) ||
38 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
b5d21704 39 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
2a0bd75e
AO		 40 return -1;
41 }
42
43 return 0;
44}
45
b56b92a9
JD		 46/*
47 * V3 and later support this fast command
48 */
49static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
50 unsigned char *param)
51{
52 struct ps2dev *ps2dev = &psmouse->ps2dev;
53
54 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
55 ps2_command(ps2dev, NULL, c) ||
56 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
57 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
58 return -1;
59 }
60
61 return 0;
62}
63
2a0bd75e
AO		 64/*
65 * A retrying version of ps2_command
66 */
67static int elantech_ps2_command(struct psmouse *psmouse,
68 unsigned char *param, int command)
69{
70 struct ps2dev *ps2dev = &psmouse->ps2dev;
71 struct elantech_data *etd = psmouse->private;
72 int rc;
73 int tries = ETP_PS2_COMMAND_TRIES;
74
75 do {
76 rc = ps2_command(ps2dev, param, command);
77 if (rc == 0)
78 break;
79 tries--;
d4ae84a8
DT		 80 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
81 command, tries);
2a0bd75e
AO		 82 msleep(ETP_PS2_COMMAND_DELAY);
83 } while (tries > 0);
84
85 if (rc)
b5d21704 86 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
2a0bd75e
AO		 87
88 return rc;
89}
90
91/*
92 * Send an Elantech style special command to read a value from a register
93 */
94static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
95 unsigned char *val)
96{
97 struct elantech_data *etd = psmouse->private;
98 unsigned char param[3];
99 int rc = 0;
100
1dc6edec 101 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 102 return -1;
103
104 if (reg > 0x11 && reg < 0x20)
105 return -1;
106
107 switch (etd->hw_version) {
108 case 1:
109 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
110 psmouse_sliced_command(psmouse, reg) ||
111 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
112 rc = -1;
113 }
114 break;
115
116 case 2:
117 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
118 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
119 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
120 elantech_ps2_command(psmouse, NULL, reg) ||
121 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
122 rc = -1;
123 }
124 break;
28f49616 125
1dc6edec 126 case 3 ... 4:
28f49616
JD		 127 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
128 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
129 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
130 elantech_ps2_command(psmouse, NULL, reg) ||
131 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
132 rc = -1;
133 }
134 break;
2a0bd75e
AO		 135 }
136
137 if (rc)
b5d21704 138 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
1dc6edec 139 else if (etd->hw_version != 4)
2a0bd75e 140 *val = param[0];
1dc6edec
JD		 141 else
142 *val = param[1];
2a0bd75e
AO		 143
144 return rc;
145}
146
147/*
148 * Send an Elantech style special command to write a register with a value
149 */
150static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
151 unsigned char val)
152{
153 struct elantech_data *etd = psmouse->private;
154 int rc = 0;
155
1dc6edec 156 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 157 return -1;
158
159 if (reg > 0x11 && reg < 0x20)
160 return -1;
161
162 switch (etd->hw_version) {
163 case 1:
164 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
165 psmouse_sliced_command(psmouse, reg) ||
166 psmouse_sliced_command(psmouse, val) ||
167 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
168 rc = -1;
169 }
170 break;
171
172 case 2:
173 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
174 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
175 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
176 elantech_ps2_command(psmouse, NULL, reg) ||
177 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
178 elantech_ps2_command(psmouse, NULL, val) ||
179 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
180 rc = -1;
181 }
182 break;
28f49616
JD		 183
184 case 3:
185 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
186 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
187 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
188 elantech_ps2_command(psmouse, NULL, reg) ||
189 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
190 elantech_ps2_command(psmouse, NULL, val) ||
191 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
192 rc = -1;
193 }
194 break;
1dc6edec
JD		 195
196 case 4:
197 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
198 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
199 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
200 elantech_ps2_command(psmouse, NULL, reg) ||
201 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
202 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
203 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
204 elantech_ps2_command(psmouse, NULL, val) ||
205 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
206 rc = -1;
207 }
208 break;
2a0bd75e
AO		 209 }
210
211 if (rc)
b5d21704
DT		 212 psmouse_err(psmouse,
213 "failed to write register 0x%02x with value 0x%02x.\n",
214 reg, val);
2a0bd75e
AO		 215
216 return rc;
217}
218
219/*
220 * Dump a complete mouse movement packet to the syslog
221 */
b5d21704 222static void elantech_packet_dump(struct psmouse *psmouse)
2a0bd75e
AO		 223{
224 int i;
225
b5d21704
DT		 226 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
227 for (i = 0; i < psmouse->pktsize; i++)
228 printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
2a0bd75e
AO		 229 printk("]\n");
230}
231
232/*
233 * Interpret complete data packets and report absolute mode input events for
234 * hardware version 1. (4 byte packets)
235 */
236static void elantech_report_absolute_v1(struct psmouse *psmouse)
237{
238 struct input_dev *dev = psmouse->dev;
239 struct elantech_data *etd = psmouse->private;
240 unsigned char *packet = psmouse->packet;
241 int fingers;
242
504e8bee 243 if (etd->fw_version < 0x020000) {
e938fbfd
FR		 244 /*
245 * byte 0: D U p1 p2 1 p3 R L
246 * byte 1: f 0 th tw x9 x8 y9 y8
247 */
2a0bd75e
AO		 248 fingers = ((packet[1] & 0x80) >> 7) +
249 ((packet[1] & 0x30) >> 4);
250 } else {
e938fbfd
FR		 251 /*
252 * byte 0: n1 n0 p2 p1 1 p3 R L
253 * byte 1: 0 0 0 0 x9 x8 y9 y8
254 */
2a0bd75e
AO		 255 fingers = (packet[0] & 0xc0) >> 6;
256 }
257
3f8c0df4 258 if (etd->jumpy_cursor) {
7f29f17b
ÉP		 259 if (fingers != 1) {
260 etd->single_finger_reports = 0;
261 } else if (etd->single_finger_reports < 2) {
262 /* Discard first 2 reports of one finger, bogus */
263 etd->single_finger_reports++;
d4ae84a8 264 elantech_debug("discarding packet\n");
7f29f17b 265 return;
3f8c0df4
AO		 266 }
267 }
268
2a0bd75e
AO		 269 input_report_key(dev, BTN_TOUCH, fingers != 0);
270
e938fbfd
FR		 271 /*
272 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
273 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
274 */
2a0bd75e
AO		 275 if (fingers) {
276 input_report_abs(dev, ABS_X,
277 ((packet[1] & 0x0c) << 6) | packet[2]);
e938fbfd 278 input_report_abs(dev, ABS_Y,
230282a7 279 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
2a0bd75e
AO		 280 }
281
282 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
283 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
284 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
285 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
286 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
287
504e8bee 288 if (etd->fw_version < 0x020000 &&
230282a7 289 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 290 /* rocker up */
291 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
292 /* rocker down */
293 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
294 }
295
296 input_sync(dev);
297}
298
89eec4d7
ÉP		 299static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
300 unsigned int x, unsigned int y)
301{
302 input_mt_slot(dev, slot);
303 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
304 if (active) {
305 input_report_abs(dev, ABS_MT_POSITION_X, x);
306 input_report_abs(dev, ABS_MT_POSITION_Y, y);
307 }
308}
309
310/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
311static void elantech_report_semi_mt_data(struct input_dev *dev,
312 unsigned int num_fingers,
313 unsigned int x1, unsigned int y1,
314 unsigned int x2, unsigned int y2)
315{
316 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
317 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
318}
319
2a0bd75e
AO		 320/*
321 * Interpret complete data packets and report absolute mode input events for
322 * hardware version 2. (6 byte packets)
323 */
324static void elantech_report_absolute_v2(struct psmouse *psmouse)
325{
f941c705 326 struct elantech_data *etd = psmouse->private;
2a0bd75e
AO		 327 struct input_dev *dev = psmouse->dev;
328 unsigned char *packet = psmouse->packet;
461a7917
JD		 329 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
330 unsigned int width = 0, pres = 0;
2a0bd75e
AO		 331
332 /* byte 0: n1 n0 . . . . R L */
333 fingers = (packet[0] & 0xc0) >> 6;
2a0bd75e
AO		 334
335 switch (fingers) {
22462d9f
ÉP		 336 case 3:
337 /*
338 * Same as one finger, except report of more than 3 fingers:
339 * byte 3: n4 . w1 w0 . . . .
340 */
341 if (packet[3] & 0x80)
342 fingers = 4;
343 /* pass through... */
2a0bd75e 344 case 1:
e938fbfd 345 /*
11559619 346 * byte 1: . . . . x11 x10 x9 x8
e938fbfd
FR		 347 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
348 */
11559619 349 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
e938fbfd 350 /*
11559619 351 * byte 4: . . . . y11 y10 y9 y8
e938fbfd
FR		 352 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
353 */
230282a7 354 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
89eec4d7 355
f941c705
ÉP		 356 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
357 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
2a0bd75e
AO		 358 break;
359
360 case 2:
e938fbfd
FR		 361 /*
362 * The coordinate of each finger is reported separately
363 * with a lower resolution for two finger touches:
364 * byte 0: . . ay8 ax8 . . . .
365 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
366 */
461a7917 367 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
2a0bd75e 368 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
230282a7 369 y1 = etd->y_max -
461a7917 370 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
e938fbfd
FR		 371 /*
372 * byte 3: . . by8 bx8 . . . .
373 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
374 */
461a7917 375 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
2a0bd75e 376 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
230282a7 377 y2 = etd->y_max -
461a7917 378 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
f941c705
ÉP		 379
380 /* Unknown so just report sensible values */
381 pres = 127;
382 width = 7;
2a0bd75e
AO		 383 break;
384 }
385
461a7917
JD		 386 input_report_key(dev, BTN_TOUCH, fingers != 0);
387 if (fingers != 0) {
388 input_report_abs(dev, ABS_X, x1);
389 input_report_abs(dev, ABS_Y, y1);
390 }
89eec4d7 391 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
2a0bd75e
AO		 392 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
393 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
394 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
22462d9f 395 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
2a0bd75e
AO		 396 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
397 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
f941c705
ÉP		 398 if (etd->reports_pressure) {
399 input_report_abs(dev, ABS_PRESSURE, pres);
400 input_report_abs(dev, ABS_TOOL_WIDTH, width);
401 }
2a0bd75e
AO		 402
403 input_sync(dev);
404}
405
28f49616
JD		 406/*
407 * Interpret complete data packets and report absolute mode input events for
408 * hardware version 3. (12 byte packets for two fingers)
409 */
410static void elantech_report_absolute_v3(struct psmouse *psmouse,
411 int packet_type)
412{
413 struct input_dev *dev = psmouse->dev;
414 struct elantech_data *etd = psmouse->private;
415 unsigned char *packet = psmouse->packet;
416 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
417 unsigned int width = 0, pres = 0;
418
419 /* byte 0: n1 n0 . . . . R L */
420 fingers = (packet[0] & 0xc0) >> 6;
421
422 switch (fingers) {
423 case 3:
424 case 1:
425 /*
426 * byte 1: . . . . x11 x10 x9 x8
427 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
428 */
429 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
430 /*
431 * byte 4: . . . . y11 y10 y9 y8
432 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
433 */
434 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
435 break;
436
437 case 2:
438 if (packet_type == PACKET_V3_HEAD) {
439 /*
440 * byte 1: . . . . ax11 ax10 ax9 ax8
441 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
442 */
1dc6edec 443 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
28f49616
JD		 444 /*
445 * byte 4: . . . . ay11 ay10 ay9 ay8
446 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
447 */
1dc6edec 448 etd->mt[0].y = etd->y_max -
28f49616
JD		 449 (((packet[4] & 0x0f) << 8) | packet[5]);
450 /*
451 * wait for next packet
452 */
453 return;
454 }
455
456 /* packet_type == PACKET_V3_TAIL */
1dc6edec
JD		 457 x1 = etd->mt[0].x;
458 y1 = etd->mt[0].y;
28f49616
JD		 459 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
460 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
461 break;
462 }
463
464 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
465 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
466
467 input_report_key(dev, BTN_TOUCH, fingers != 0);
468 if (fingers != 0) {
469 input_report_abs(dev, ABS_X, x1);
470 input_report_abs(dev, ABS_Y, y1);
471 }
472 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
473 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
474 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
475 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
476 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
477 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
478 input_report_abs(dev, ABS_PRESSURE, pres);
479 input_report_abs(dev, ABS_TOOL_WIDTH, width);
480
481 input_sync(dev);
482}
483
1dc6edec
JD		 484static void elantech_input_sync_v4(struct psmouse *psmouse)
485{
486 struct input_dev *dev = psmouse->dev;
487 unsigned char *packet = psmouse->packet;
488
489 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
c15bdfd5 490 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
1dc6edec
JD		 491 input_mt_report_pointer_emulation(dev, true);
492 input_sync(dev);
493}
494
495static void process_packet_status_v4(struct psmouse *psmouse)
496{
497 struct input_dev *dev = psmouse->dev;
498 unsigned char *packet = psmouse->packet;
499 unsigned fingers;
500 int i;
501
502 /* notify finger state change */
503 fingers = packet[1] & 0x1f;
504 for (i = 0; i < ETP_MAX_FINGERS; i++) {
505 if ((fingers & (1 << i)) == 0) {
506 input_mt_slot(dev, i);
507 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
508 }
509 }
510
511 elantech_input_sync_v4(psmouse);
512}
513
514static void process_packet_head_v4(struct psmouse *psmouse)
515{
516 struct input_dev *dev = psmouse->dev;
517 struct elantech_data *etd = psmouse->private;
518 unsigned char *packet = psmouse->packet;
519 int id = ((packet[3] & 0xe0) >> 5) - 1;
520 int pres, traces;
521
522 if (id < 0)
523 return;
524
525 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
526 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
527 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
528 traces = (packet[0] & 0xf0) >> 4;
529
530 input_mt_slot(dev, id);
531 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
532
533 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
534 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
535 input_report_abs(dev, ABS_MT_PRESSURE, pres);
536 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
537 /* report this for backwards compatibility */
538 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
539
540 elantech_input_sync_v4(psmouse);
541}
542
543static void process_packet_motion_v4(struct psmouse *psmouse)
544{
545 struct input_dev *dev = psmouse->dev;
546 struct elantech_data *etd = psmouse->private;
547 unsigned char *packet = psmouse->packet;
548 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
549 int id, sid;
550
551 id = ((packet[0] & 0xe0) >> 5) - 1;
552 if (id < 0)
553 return;
554
555 sid = ((packet[3] & 0xe0) >> 5) - 1;
556 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
557 /*
558 * Motion packets give us the delta of x, y values of specific fingers,
559 * but in two's complement. Let the compiler do the conversion for us.
560 * Also _enlarge_ the numbers to int, in case of overflow.
561 */
562 delta_x1 = (signed char)packet[1];
563 delta_y1 = (signed char)packet[2];
564 delta_x2 = (signed char)packet[4];
565 delta_y2 = (signed char)packet[5];
566
567 etd->mt[id].x += delta_x1 * weight;
568 etd->mt[id].y -= delta_y1 * weight;
569 input_mt_slot(dev, id);
570 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
571 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
572
573 if (sid >= 0) {
574 etd->mt[sid].x += delta_x2 * weight;
575 etd->mt[sid].y -= delta_y2 * weight;
576 input_mt_slot(dev, sid);
577 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
578 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
579 }
580
581 elantech_input_sync_v4(psmouse);
582}
583
584static void elantech_report_absolute_v4(struct psmouse *psmouse,
585 int packet_type)
586{
587 switch (packet_type) {
588 case PACKET_V4_STATUS:
589 process_packet_status_v4(psmouse);
590 break;
591
592 case PACKET_V4_HEAD:
593 process_packet_head_v4(psmouse);
594 break;
595
596 case PACKET_V4_MOTION:
597 process_packet_motion_v4(psmouse);
598 break;
599
600 case PACKET_UNKNOWN:
601 default:
602 /* impossible to get here */
603 break;
604 }
605}
606
7894f21b 607static int elantech_packet_check_v1(struct psmouse *psmouse)
2a0bd75e
AO		 608{
609 struct elantech_data *etd = psmouse->private;
610 unsigned char *packet = psmouse->packet;
611 unsigned char p1, p2, p3;
612
613 /* Parity bits are placed differently */
504e8bee 614 if (etd->fw_version < 0x020000) {
2a0bd75e
AO		 615 /* byte 0: D U p1 p2 1 p3 R L */
616 p1 = (packet[0] & 0x20) >> 5;
617 p2 = (packet[0] & 0x10) >> 4;
618 } else {
619 /* byte 0: n1 n0 p2 p1 1 p3 R L */
620 p1 = (packet[0] & 0x10) >> 4;
621 p2 = (packet[0] & 0x20) >> 5;
622 }
623
624 p3 = (packet[0] & 0x04) >> 2;
625
626 return etd->parity[packet[1]] == p1 &&
627 etd->parity[packet[2]] == p2 &&
628 etd->parity[packet[3]] == p3;
629}
630
84a90b61
JD		 631static int elantech_debounce_check_v2(struct psmouse *psmouse)
632{
633 /*
634 * When we encounter packet that matches this exactly, it means the
635 * hardware is in debounce status. Just ignore the whole packet.
636 */
637 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
638 unsigned char *packet = psmouse->packet;
639
640 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
641}
642
7894f21b
JD		 643static int elantech_packet_check_v2(struct psmouse *psmouse)
644{
645 struct elantech_data *etd = psmouse->private;
646 unsigned char *packet = psmouse->packet;
647
648 /*
649 * V2 hardware has two flavors. Older ones that do not report pressure,
650 * and newer ones that reports pressure and width. With newer ones, all
651 * packets (1, 2, 3 finger touch) have the same constant bits. With
652 * older ones, 1/3 finger touch packets and 2 finger touch packets
653 * have different constant bits.
654 * With all three cases, if the constant bits are not exactly what I
655 * expected, I consider them invalid.
656 */
657 if (etd->reports_pressure)
658 return (packet[0] & 0x0c) == 0x04 &&
659 (packet[3] & 0x0f) == 0x02;
660
661 if ((packet[0] & 0xc0) == 0x80)
662 return (packet[0] & 0x0c) == 0x0c &&
663 (packet[3] & 0x0e) == 0x08;
664
665 return (packet[0] & 0x3c) == 0x3c &&
666 (packet[1] & 0xf0) == 0x00 &&
667 (packet[3] & 0x3e) == 0x38 &&
668 (packet[4] & 0xf0) == 0x00;
669}
670
28f49616
JD		 671/*
672 * We check the constant bits to determine what packet type we get,
1dc6edec 673 * so packet checking is mandatory for v3 and later hardware.
28f49616
JD		 674 */
675static int elantech_packet_check_v3(struct psmouse *psmouse)
676{
acc0444b 677 struct elantech_data *etd = psmouse->private;
28f49616
JD		 678 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
679 unsigned char *packet = psmouse->packet;
680
681 /*
682 * check debounce first, it has the same signature in byte 0
683 * and byte 3 as PACKET_V3_HEAD.
684 */
685 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
686 return PACKET_DEBOUNCE;
687
acc0444b
MD		 688 /*
689 * If the hardware flag 'crc_enabled' is set the packets have
690 * different signatures.
691 */
692 if (etd->crc_enabled) {
693 if ((packet[3] & 0x09) == 0x08)
694 return PACKET_V3_HEAD;
695
696 if ((packet[3] & 0x09) == 0x09)
697 return PACKET_V3_TAIL;
698 } else {
699 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
700 return PACKET_V3_HEAD;
28f49616 701
acc0444b
MD		 702 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
703 return PACKET_V3_TAIL;
704 }
28f49616
JD		 705
706 return PACKET_UNKNOWN;
707}
708
1dc6edec
JD		 709static int elantech_packet_check_v4(struct psmouse *psmouse)
710{
acc0444b 711 struct elantech_data *etd = psmouse->private;
1dc6edec 712 unsigned char *packet = psmouse->packet;
9eebed7d 713 unsigned char packet_type = packet[3] & 0x03;
acc0444b
MD		 714 bool sanity_check;
715
716 /*
717 * Sanity check based on the constant bits of a packet.
718 * The constant bits change depending on the value of
719 * the hardware flag 'crc_enabled' but are the same for
720 * every packet, regardless of the type.
721 */
722 if (etd->crc_enabled)
723 sanity_check = ((packet[3] & 0x08) == 0x00);
724 else
725 sanity_check = ((packet[0] & 0x0c) == 0x04 &&
726 (packet[3] & 0x1c) == 0x10);
727
728 if (!sanity_check)
729 return PACKET_UNKNOWN;
1dc6edec 730
9eebed7d
MD		 731 switch (packet_type) {
732 case 0:
733 return PACKET_V4_STATUS;
734
735 case 1:
1dc6edec
JD		 736 return PACKET_V4_HEAD;
737
9eebed7d 738 case 2:
1dc6edec 739 return PACKET_V4_MOTION;
9eebed7d 740 }
1dc6edec
JD		 741
742 return PACKET_UNKNOWN;
743}
744
2a0bd75e
AO		 745/*
746 * Process byte stream from mouse and handle complete packets
747 */
748static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
749{
750 struct elantech_data *etd = psmouse->private;
28f49616 751 int packet_type;
2a0bd75e
AO		 752
753 if (psmouse->pktcnt < psmouse->pktsize)
754 return PSMOUSE_GOOD_DATA;
755
756 if (etd->debug > 1)
b5d21704 757 elantech_packet_dump(psmouse);
2a0bd75e
AO		 758
759 switch (etd->hw_version) {
760 case 1:
7894f21b 761 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
2a0bd75e
AO		 762 return PSMOUSE_BAD_DATA;
763
764 elantech_report_absolute_v1(psmouse);
765 break;
766
767 case 2:
84a90b61
JD		 768 /* ignore debounce */
769 if (elantech_debounce_check_v2(psmouse))
770 return PSMOUSE_FULL_PACKET;
771
7894f21b
JD		 772 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
773 return PSMOUSE_BAD_DATA;
774
2a0bd75e
AO		 775 elantech_report_absolute_v2(psmouse);
776 break;
28f49616
JD		 777
778 case 3:
779 packet_type = elantech_packet_check_v3(psmouse);
780 /* ignore debounce */
781 if (packet_type == PACKET_DEBOUNCE)
782 return PSMOUSE_FULL_PACKET;
783
784 if (packet_type == PACKET_UNKNOWN)
785 return PSMOUSE_BAD_DATA;
786
787 elantech_report_absolute_v3(psmouse, packet_type);
788 break;
1dc6edec
JD		 789
790 case 4:
791 packet_type = elantech_packet_check_v4(psmouse);
792 if (packet_type == PACKET_UNKNOWN)
793 return PSMOUSE_BAD_DATA;
794
795 elantech_report_absolute_v4(psmouse, packet_type);
796 break;
2a0bd75e
AO		 797 }
798
799 return PSMOUSE_FULL_PACKET;
800}
801
802/*
803 * Put the touchpad into absolute mode
804 */
805static int elantech_set_absolute_mode(struct psmouse *psmouse)
806{
807 struct elantech_data *etd = psmouse->private;
808 unsigned char val;
809 int tries = ETP_READ_BACK_TRIES;
810 int rc = 0;
811
812 switch (etd->hw_version) {
813 case 1:
814 etd->reg_10 = 0x16;
815 etd->reg_11 = 0x8f;
816 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
817 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
818 rc = -1;
819 }
820 break;
821
822 case 2:
823 /* Windows driver values */
824 etd->reg_10 = 0x54;
825 etd->reg_11 = 0x88; /* 0x8a */
826 etd->reg_21 = 0x60; /* 0x00 */
827 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
828 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
829 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
830 rc = -1;
2a0bd75e 831 }
28f49616
JD		 832 break;
833
834 case 3:
36189cc3
HG		 835 if (etd->set_hw_resolution)
836 etd->reg_10 = 0x0b;
837 else
838 etd->reg_10 = 0x03;
839
28f49616
JD		 840 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
841 rc = -1;
842
843 break;
1dc6edec
JD		 844
845 case 4:
846 etd->reg_07 = 0x01;
847 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
848 rc = -1;
849
850 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
b2546df6
AO		 851 }
852
853 if (rc == 0) {
2a0bd75e 854 /*
b2546df6
AO		 855 * Read back reg 0x10. For hardware version 1 we must make
856 * sure the absolute mode bit is set. For hardware version 2
b5d21704 857 * the touchpad is probably initializing and not ready until
b2546df6 858 * we read back the value we just wrote.
2a0bd75e
AO		 859 */
860 do {
861 rc = elantech_read_reg(psmouse, 0x10, &val);
862 if (rc == 0)
863 break;
864 tries--;
d4ae84a8 865 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 866 msleep(ETP_READ_BACK_DELAY);
867 } while (tries > 0);
b2546df6
AO		 868
869 if (rc) {
b5d21704
DT		 870 psmouse_err(psmouse,
871 "failed to read back register 0x10.\n");
b2546df6
AO		 872 } else if (etd->hw_version == 1 &&
873 !(val & ETP_R10_ABSOLUTE_MODE)) {
b5d21704
DT		 874 psmouse_err(psmouse,
875 "touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 876 rc = -1;
877 }
2a0bd75e
AO		 878 }
879
1dc6edec 880 skip_readback_reg_10:
2a0bd75e 881 if (rc)
b5d21704 882 psmouse_err(psmouse, "failed to initialise registers.\n");
2a0bd75e
AO		 883
884 return rc;
885}
886
28f49616
JD		 887static int elantech_set_range(struct psmouse *psmouse,
888 unsigned int *x_min, unsigned int *y_min,
1dc6edec
JD		 889 unsigned int *x_max, unsigned int *y_max,
890 unsigned int *width)
230282a7
JD		 891{
892 struct elantech_data *etd = psmouse->private;
28f49616 893 unsigned char param[3];
1dc6edec 894 unsigned char traces;
230282a7
JD		 895
896 switch (etd->hw_version) {
897 case 1:
898 *x_min = ETP_XMIN_V1;
899 *y_min = ETP_YMIN_V1;
900 *x_max = ETP_XMAX_V1;
901 *y_max = ETP_YMAX_V1;
902 break;
903
904 case 2:
905 if (etd->fw_version == 0x020800 ||
906 etd->fw_version == 0x020b00 ||
907 etd->fw_version == 0x020030) {
908 *x_min = ETP_XMIN_V2;
909 *y_min = ETP_YMIN_V2;
910 *x_max = ETP_XMAX_V2;
911 *y_max = ETP_YMAX_V2;
912 } else {
84a90b61
JD		 913 int i;
914 int fixed_dpi;
915
230282a7
JD		 916 i = (etd->fw_version > 0x020800 &&
917 etd->fw_version < 0x020900) ? 1 : 2;
84a90b61 918
b56b92a9 919 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
84a90b61
JD		 920 return -1;
921
922 fixed_dpi = param[1] & 0x10;
923
924 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
b56b92a9 925 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
84a90b61
JD		 926 return -1;
927
928 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
929 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
930 } else if (etd->fw_version == 0x040216) {
931 *x_max = 819;
932 *y_max = 405;
933 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
934 *x_max = 900;
935 *y_max = 500;
936 } else {
937 *x_max = (etd->capabilities[1] - i) * 64;
938 *y_max = (etd->capabilities[2] - i) * 64;
939 }
230282a7
JD		 940 }
941 break;
28f49616
JD		 942
943 case 3:
b56b92a9 944 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
28f49616
JD		 945 return -1;
946
947 *x_max = (0x0f & param[0]) << 8 | param[1];
948 *y_max = (0xf0 & param[0]) << 4 | param[2];
949 break;
1dc6edec
JD		 950
951 case 4:
b56b92a9 952 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1dc6edec
JD		 953 return -1;
954
955 *x_max = (0x0f & param[0]) << 8 | param[1];
956 *y_max = (0xf0 & param[0]) << 4 | param[2];
957 traces = etd->capabilities[1];
958 if ((traces < 2) || (traces > *x_max))
959 return -1;
960
961 *width = *x_max / (traces - 1);
962 break;
230282a7 963 }
28f49616
JD		 964
965 return 0;
230282a7
JD		 966}
967
3d95fd6a
JD		 968/*
969 * (value from firmware) * 10 + 790 = dpi
970 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
971 */
972static unsigned int elantech_convert_res(unsigned int val)
973{
974 return (val * 10 + 790) * 10 / 254;
975}
976
977static int elantech_get_resolution_v4(struct psmouse *psmouse,
978 unsigned int *x_res,
979 unsigned int *y_res)
980{
981 unsigned char param[3];
982
983 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
984 return -1;
985
986 *x_res = elantech_convert_res(param[1] & 0x0f);
987 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
988
989 return 0;
990}
991
c15bdfd5
HG		 992/*
993 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
994 * fw_version for this is based on the following fw_version & caps table:
995 *
996 * Laptop-model: fw_version: caps: buttons:
997 * Acer S3 0x461f00 10, 13, 0e clickpad
998 * Acer S7-392 0x581f01 50, 17, 0d clickpad
999 * Acer V5-131 0x461f02 01, 16, 0c clickpad
1000 * Acer V5-551 0x461f00 ? clickpad
1001 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons
1002 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons
1003 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons
1004 * Asus UX31 0x361f00 20, 15, 0e clickpad
1005 * Asus UX32VD 0x361f02 00, 15, 0e clickpad
1006 * Avatar AVIU-145A2 0x361f00 ? clickpad
1007 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons
1008 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*)
1009 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons
1010 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad
1011 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad
1012 * Samsung NP900X3E-A02 0x575f03 ? clickpad
1013 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad
1014 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons
1015 * Samsung RF710 0x450f00 ? 2 hw buttons
1016 * System76 Pangolin 0x250f01 ? 2 hw buttons
1017 * (*) + 3 trackpoint buttons
1018 */
1019static void elantech_set_buttonpad_prop(struct psmouse *psmouse)
1020{
1021 struct input_dev *dev = psmouse->dev;
1022 struct elantech_data *etd = psmouse->private;
1023
1024 if (etd->fw_version & 0x001000) {
1025 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1026 __clear_bit(BTN_RIGHT, dev->keybit);
1027 }
1028}
1029
2a0bd75e
AO		 1030/*
1031 * Set the appropriate event bits for the input subsystem
1032 */
28f49616 1033static int elantech_set_input_params(struct psmouse *psmouse)
2a0bd75e
AO		 1034{
1035 struct input_dev *dev = psmouse->dev;
1036 struct elantech_data *etd = psmouse->private;
1dc6edec 1037 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
3d95fd6a 1038 unsigned int x_res = 0, y_res = 0;
230282a7 1039
1dc6edec 1040 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
28f49616 1041 return -1;
2a0bd75e 1042
e3dde4fb 1043 __set_bit(INPUT_PROP_POINTER, dev->propbit);
2a0bd75e
AO		 1044 __set_bit(EV_KEY, dev->evbit);
1045 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 1046 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 1047
1048 __set_bit(BTN_LEFT, dev->keybit);
1049 __set_bit(BTN_RIGHT, dev->keybit);
1050
1051 __set_bit(BTN_TOUCH, dev->keybit);
1052 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1053 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1054 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1055
1056 switch (etd->hw_version) {
1057 case 1:
1058 /* Rocker button */
504e8bee 1059 if (etd->fw_version < 0x020000 &&
230282a7 1060 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 1061 __set_bit(BTN_FORWARD, dev->keybit);
1062 __set_bit(BTN_BACK, dev->keybit);
1063 }
230282a7
JD		 1064 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1065 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 1066 break;
1067
1068 case 2:
22462d9f 1069 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
28f49616
JD		 1070 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1071 /* fall through */
1072 case 3:
c15bdfd5
HG		 1073 if (etd->hw_version == 3)
1074 elantech_set_buttonpad_prop(psmouse);
230282a7
JD		 1075 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1076 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 1077 if (etd->reports_pressure) {
1078 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1079 ETP_PMAX_V2, 0, 0);
1080 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1081 ETP_WMAX_V2, 0, 0);
1082 }
b4adbbef 1083 input_mt_init_slots(dev, 2, 0);
230282a7
JD		 1084 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1085 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e 1086 break;
1dc6edec
JD		 1087
1088 case 4:
3d95fd6a
JD		 1089 if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
1090 /*
1091 * if query failed, print a warning and leave the values
1092 * zero to resemble synaptics.c behavior.
1093 */
1094 psmouse_warn(psmouse, "couldn't query resolution data.\n");
1095 }
c15bdfd5 1096 elantech_set_buttonpad_prop(psmouse);
1dc6edec
JD		 1097 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1098 /* For X to recognize me as touchpad. */
1099 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1100 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
3d95fd6a
JD		 1101 input_abs_set_res(dev, ABS_X, x_res);
1102 input_abs_set_res(dev, ABS_Y, y_res);
1dc6edec
JD		 1103 /*
1104 * range of pressure and width is the same as v2,
1105 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1106 */
1107 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1108 ETP_PMAX_V2, 0, 0);
1109 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1110 ETP_WMAX_V2, 0, 0);
1111 /* Multitouch capable pad, up to 5 fingers. */
b4adbbef 1112 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1dc6edec
JD		 1113 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1114 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
3d95fd6a
JD		 1115 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
1116 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
1dc6edec
JD		 1117 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1118 ETP_PMAX_V2, 0, 0);
1119 /*
1120 * The firmware reports how many trace lines the finger spans,
1121 * convert to surface unit as Protocol-B requires.
1122 */
1123 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1124 ETP_WMAX_V2 * width, 0, 0);
1125 break;
2a0bd75e 1126 }
230282a7
JD		 1127
1128 etd->y_max = y_max;
1dc6edec 1129 etd->width = width;
28f49616
JD		 1130
1131 return 0;
2a0bd75e
AO		 1132}
1133
1134struct elantech_attr_data {
1135 size_t field_offset;
1136 unsigned char reg;
1137};
1138
1139/*
1140 * Display a register value by reading a sysfs entry
1141 */
1142static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1143 char *buf)
1144{
1145 struct elantech_data *etd = psmouse->private;
1146 struct elantech_attr_data *attr = data;
1147 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1148 int rc = 0;
1149
1150 if (attr->reg)
1151 rc = elantech_read_reg(psmouse, attr->reg, reg);
1152
1153 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1154}
1155
1156/*
1157 * Write a register value by writing a sysfs entry
1158 */
1159static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1160 void *data, const char *buf, size_t count)
1161{
1162 struct elantech_data *etd = psmouse->private;
1163 struct elantech_attr_data *attr = data;
1164 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
76496e7a 1165 unsigned char value;
2a0bd75e
AO		 1166 int err;
1167
76496e7a 1168 err = kstrtou8(buf, 16, &value);
2a0bd75e
AO		 1169 if (err)
1170 return err;
1171
2a0bd75e
AO		 1172 /* Do we need to preserve some bits for version 2 hardware too? */
1173 if (etd->hw_version == 1) {
1174 if (attr->reg == 0x10)
1175 /* Force absolute mode always on */
1176 value |= ETP_R10_ABSOLUTE_MODE;
1177 else if (attr->reg == 0x11)
1178 /* Force 4 byte mode always on */
1179 value |= ETP_R11_4_BYTE_MODE;
1180 }
1181
1182 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1183 *reg = value;
1184
1185 return count;
1186}
1187
1188#define ELANTECH_INT_ATTR(_name, _register) \
1189 static struct elantech_attr_data elantech_attr_##_name = { \
1190 .field_offset = offsetof(struct elantech_data, _name), \
1191 .reg = _register, \
1192 }; \
1193 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1194 &elantech_attr_##_name, \
1195 elantech_show_int_attr, \
1196 elantech_set_int_attr)
1197
1dc6edec 1198ELANTECH_INT_ATTR(reg_07, 0x07);
2a0bd75e
AO		 1199ELANTECH_INT_ATTR(reg_10, 0x10);
1200ELANTECH_INT_ATTR(reg_11, 0x11);
1201ELANTECH_INT_ATTR(reg_20, 0x20);
1202ELANTECH_INT_ATTR(reg_21, 0x21);
1203ELANTECH_INT_ATTR(reg_22, 0x22);
1204ELANTECH_INT_ATTR(reg_23, 0x23);
1205ELANTECH_INT_ATTR(reg_24, 0x24);
1206ELANTECH_INT_ATTR(reg_25, 0x25);
1207ELANTECH_INT_ATTR(reg_26, 0x26);
1208ELANTECH_INT_ATTR(debug, 0);
1209ELANTECH_INT_ATTR(paritycheck, 0);
1210
1211static struct attribute *elantech_attrs[] = {
1dc6edec 1212 &psmouse_attr_reg_07.dattr.attr,
2a0bd75e
AO		 1213 &psmouse_attr_reg_10.dattr.attr,
1214 &psmouse_attr_reg_11.dattr.attr,
1215 &psmouse_attr_reg_20.dattr.attr,
1216 &psmouse_attr_reg_21.dattr.attr,
1217 &psmouse_attr_reg_22.dattr.attr,
1218 &psmouse_attr_reg_23.dattr.attr,
1219 &psmouse_attr_reg_24.dattr.attr,
1220 &psmouse_attr_reg_25.dattr.attr,
1221 &psmouse_attr_reg_26.dattr.attr,
1222 &psmouse_attr_debug.dattr.attr,
1223 &psmouse_attr_paritycheck.dattr.attr,
1224 NULL
1225};
1226
1227static struct attribute_group elantech_attr_group = {
1228 .attrs = elantech_attrs,
1229};
1230
a083632e
DT		 1231static bool elantech_is_signature_valid(const unsigned char *param)
1232{
1233 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1234 int i;
1235
1236 if (param[0] == 0)
1237 return false;
1238
1239 if (param[1] == 0)
1240 return true;
1241
1242 for (i = 0; i < ARRAY_SIZE(rates); i++)
1243 if (param[2] == rates[i])
1244 return false;
1245
1246 return true;
1247}
1248
2a0bd75e
AO		 1249/*
1250 * Use magic knock to detect Elantech touchpad
1251 */
b7802c5c 1252int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 1253{
1254 struct ps2dev *ps2dev = &psmouse->ps2dev;
1255 unsigned char param[3];
1256
1257 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1258
1259 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1260 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1261 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1262 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1263 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
b5d21704 1264 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
2a0bd75e
AO		 1265 return -1;
1266 }
1267
1268 /*
1269 * Report this in case there are Elantech models that use a different
1270 * set of magic numbers
1271 */
28f49616
JD		 1272 if (param[0] != 0x3c || param[1] != 0x03 ||
1273 (param[2] != 0xc8 && param[2] != 0x00)) {
b5d21704
DT		 1274 psmouse_dbg(psmouse,
1275 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1276 param[0], param[1], param[2]);
9ab7b25e
AO		 1277 return -1;
1278 }
1279
1280 /*
1281 * Query touchpad's firmware version and see if it reports known
1282 * value to avoid mis-detection. Logitech mice are known to respond
1283 * to Elantech magic knock and there might be more.
1284 */
1285 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
b5d21704 1286 psmouse_dbg(psmouse, "failed to query firmware version.\n");
9ab7b25e
AO		 1287 return -1;
1288 }
1289
b5d21704
DT		 1290 psmouse_dbg(psmouse,
1291 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1292 param[0], param[1], param[2]);
9ab7b25e 1293
a083632e 1294 if (!elantech_is_signature_valid(param)) {
b5d21704
DT		 1295 psmouse_dbg(psmouse,
1296 "Probably not a real Elantech touchpad. Aborting.\n");
4af61e90 1297 return -1;
2a0bd75e
AO		 1298 }
1299
1300 if (set_properties) {
1301 psmouse->vendor = "Elantech";
1302 psmouse->name = "Touchpad";
1303 }
1304
1305 return 0;
1306}
1307
1308/*
1309 * Clean up sysfs entries when disconnecting
1310 */
1311static void elantech_disconnect(struct psmouse *psmouse)
1312{
1313 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1314 &elantech_attr_group);
1315 kfree(psmouse->private);
1316 psmouse->private = NULL;
1317}
1318
1319/*
1320 * Put the touchpad back into absolute mode when reconnecting
1321 */
1322static int elantech_reconnect(struct psmouse *psmouse)
1323{
a67ada7a
JD		 1324 psmouse_reset(psmouse);
1325
2a0bd75e
AO		 1326 if (elantech_detect(psmouse, 0))
1327 return -1;
1328
1329 if (elantech_set_absolute_mode(psmouse)) {
b5d21704
DT		 1330 psmouse_err(psmouse,
1331 "failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 1332 return -1;
1333 }
1334
1335 return 0;
1336}
1337
36189cc3
HG		 1338/*
1339 * Some hw_version 3 models go into error state when we try to set bit 3 of r10
1340 */
1341static const struct dmi_system_id no_hw_res_dmi_table[] = {
1342#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1343 {
1344 /* Gigabyte U2442 */
1345 .matches = {
1346 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1347 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1348 },
1349 },
1350#endif
1351 { }
1352};
1353
3c8bbb95
JD		 1354/*
1355 * determine hardware version and set some properties according to it.
1356 */
28f49616 1357static int elantech_set_properties(struct elantech_data *etd)
3c8bbb95 1358{
3940d618 1359 /* This represents the version of IC body. */
1dc6edec
JD		 1360 int ver = (etd->fw_version & 0x0f0000) >> 16;
1361
3940d618 1362 /* Early version of Elan touchpads doesn't obey the rule. */
3c8bbb95
JD		 1363 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1364 etd->hw_version = 1;
3940d618
JD		 1365 else {
1366 switch (ver) {
1367 case 2:
1368 case 4:
1369 etd->hw_version = 2;
1370 break;
1371 case 5:
1372 etd->hw_version = 3;
1373 break;
1374 case 6:
9eebed7d 1375 case 7:
9cb80b96 1376 case 8:
ae4bedf0 1377 case 9:
3940d618
JD		 1378 etd->hw_version = 4;
1379 break;
1380 default:
1381 return -1;
1382 }
1383 }
3c8bbb95 1384
b56b92a9
JD		 1385 /* decide which send_cmd we're gonna use early */
1386 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
1387 synaptics_send_cmd;
1388
1389 /* Turn on packet checking by default */
3c8bbb95
JD		 1390 etd->paritycheck = 1;
1391
1392 /*
1393 * This firmware suffers from misreporting coordinates when
1394 * a touch action starts causing the mouse cursor or scrolled page
1395 * to jump. Enable a workaround.
1396 */
1397 etd->jumpy_cursor =
1398 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1399
28f49616 1400 if (etd->hw_version > 1) {
3c8bbb95
JD		 1401 /* For now show extra debug information */
1402 etd->debug = 1;
1403
1404 if (etd->fw_version >= 0x020800)
1405 etd->reports_pressure = true;
1406 }
28f49616 1407
acc0444b
MD		 1408 /*
1409 * The signatures of v3 and v4 packets change depending on the
1410 * value of this hardware flag.
1411 */
1412 etd->crc_enabled = ((etd->fw_version & 0x4000) == 0x4000);
1413
36189cc3
HG		 1414 /* Enable real hardware resolution on hw_version 3 ? */
1415 etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1416
28f49616 1417 return 0;
3c8bbb95
JD		 1418}
1419
2a0bd75e
AO		 1420/*
1421 * Initialize the touchpad and create sysfs entries
1422 */
1423int elantech_init(struct psmouse *psmouse)
1424{
1425 struct elantech_data *etd;
1426 int i, error;
1427 unsigned char param[3];
1428
9ab7b25e 1429 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 1430 if (!etd)
6792cbbb 1431 return -ENOMEM;
2a0bd75e 1432
a67ada7a
JD		 1433 psmouse_reset(psmouse);
1434
2a0bd75e
AO		 1435 etd->parity[0] = 1;
1436 for (i = 1; i < 256; i++)
1437 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1438
1439 /*
9ab7b25e 1440 * Do the version query again so we can store the result
2a0bd75e
AO		 1441 */
1442 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
b5d21704 1443 psmouse_err(psmouse, "failed to query firmware version.\n");
2a0bd75e
AO		 1444 goto init_fail;
1445 }
504e8bee 1446 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
28f49616
JD		 1447
1448 if (elantech_set_properties(etd)) {
b5d21704 1449 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
28f49616
JD		 1450 goto init_fail;
1451 }
b5d21704
DT		 1452 psmouse_info(psmouse,
1453 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1454 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 1455
b56b92a9 1456 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
230282a7 1457 etd->capabilities)) {
b5d21704 1458 psmouse_err(psmouse, "failed to query capabilities.\n");
2a0bd75e
AO		 1459 goto init_fail;
1460 }
b5d21704
DT		 1461 psmouse_info(psmouse,
1462 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1463 etd->capabilities[0], etd->capabilities[1],
1464 etd->capabilities[2]);
2a0bd75e
AO		 1465
1466 if (elantech_set_absolute_mode(psmouse)) {
b5d21704
DT		 1467 psmouse_err(psmouse,
1468 "failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 1469 goto init_fail;
1470 }
1471
28f49616 1472 if (elantech_set_input_params(psmouse)) {
b5d21704 1473 psmouse_err(psmouse, "failed to query touchpad range.\n");
28f49616
JD		 1474 goto init_fail;
1475 }
2a0bd75e
AO		 1476
1477 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1478 &elantech_attr_group);
1479 if (error) {
b5d21704
DT		 1480 psmouse_err(psmouse,
1481 "failed to create sysfs attributes, error: %d.\n",
1482 error);
2a0bd75e
AO		 1483 goto init_fail;
1484 }
1485
1486 psmouse->protocol_handler = elantech_process_byte;
1487 psmouse->disconnect = elantech_disconnect;
1488 psmouse->reconnect = elantech_reconnect;
28f49616 1489 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
2a0bd75e
AO		 1490
1491 return 0;
1492
1493 init_fail:
1494 kfree(etd);
1495 return -1;
1496}
Linux kernel - Deliverables
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