1/*
2 * Elantech Touchpad driver (v6)
3 *
4 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
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>
14#include <linux/dmi.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/i2c.h>
18#include <linux/input.h>
19#include <linux/input/mt.h>
20#include <linux/platform_device.h>
21#include <linux/serio.h>
22#include <linux/libps2.h>
23#include <asm/unaligned.h>
24#include "psmouse.h"
25#include "elantech.h"
26#include "elan_i2c.h"
27
28#define elantech_debug(fmt, ...) \
29 do { \
30 if (etd->info.debug) \
31 psmouse_printk(KERN_DEBUG, psmouse, \
32 fmt, ##__VA_ARGS__); \
33 } while (0)
34
35/*
36 * Send a Synaptics style sliced query command
37 */
38static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
39 unsigned char *param)
40{
41 if (ps2_sliced_command(&psmouse->ps2dev, c) ||
42 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
43 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
44 return -1;
45 }
46
47 return 0;
48}
49
50/*
51 * V3 and later support this fast command
52 */
53static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
54 unsigned char *param)
55{
56 struct ps2dev *ps2dev = &psmouse->ps2dev;
57
58 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
59 ps2_command(ps2dev, NULL, c) ||
60 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
61 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
62 return -1;
63 }
64
65 return 0;
66}
67
68/*
69 * A retrying version of ps2_command
70 */
71static int elantech_ps2_command(struct psmouse *psmouse,
72 unsigned char *param, int command)
73{
74 struct ps2dev *ps2dev = &psmouse->ps2dev;
75 struct elantech_data *etd = psmouse->private;
76 int rc;
77 int tries = ETP_PS2_COMMAND_TRIES;
78
79 do {
80 rc = ps2_command(ps2dev, param, command);
81 if (rc == 0)
82 break;
83 tries--;
84 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
85 command, tries);
86 msleep(ETP_PS2_COMMAND_DELAY);
87 } while (tries > 0);
88
89 if (rc)
90 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
91
92 return rc;
93}
94
95/*
96 * Send an Elantech style special command to read a value from a register
97 */
98static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
99 unsigned char *val)
100{
101 struct elantech_data *etd = psmouse->private;
102 unsigned char param[3];
103 int rc = 0;
104
105 if (reg < 0x07 || reg > 0x26)
106 return -1;
107
108 if (reg > 0x11 && reg < 0x20)
109 return -1;
110
111 switch (etd->info.hw_version) {
112 case 1:
113 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_READ) ||
114 ps2_sliced_command(&psmouse->ps2dev, reg) ||
115 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
116 rc = -1;
117 }
118 break;
119
120 case 2:
121 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
122 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
123 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
124 elantech_ps2_command(psmouse, NULL, reg) ||
125 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
126 rc = -1;
127 }
128 break;
129
130 case 3 ... 4:
131 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
132 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
133 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
134 elantech_ps2_command(psmouse, NULL, reg) ||
135 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
136 rc = -1;
137 }
138 break;
139 }
140
141 if (rc)
142 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
143 else if (etd->info.hw_version != 4)
144 *val = param[0];
145 else
146 *val = param[1];
147
148 return rc;
149}
150
151/*
152 * Send an Elantech style special command to write a register with a value
153 */
154static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
155 unsigned char val)
156{
157 struct elantech_data *etd = psmouse->private;
158 int rc = 0;
159
160 if (reg < 0x07 || reg > 0x26)
161 return -1;
162
163 if (reg > 0x11 && reg < 0x20)
164 return -1;
165
166 switch (etd->info.hw_version) {
167 case 1:
168 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_WRITE) ||
169 ps2_sliced_command(&psmouse->ps2dev, reg) ||
170 ps2_sliced_command(&psmouse->ps2dev, val) ||
171 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
172 rc = -1;
173 }
174 break;
175
176 case 2:
177 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
178 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
179 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
180 elantech_ps2_command(psmouse, NULL, reg) ||
181 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
182 elantech_ps2_command(psmouse, NULL, val) ||
183 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
184 rc = -1;
185 }
186 break;
187
188 case 3:
189 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
190 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
191 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
192 elantech_ps2_command(psmouse, NULL, reg) ||
193 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
194 elantech_ps2_command(psmouse, NULL, val) ||
195 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
196 rc = -1;
197 }
198 break;
199
200 case 4:
201 if (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, reg) ||
205 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
206 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
207 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
208 elantech_ps2_command(psmouse, NULL, val) ||
209 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
210 rc = -1;
211 }
212 break;
213 }
214
215 if (rc)
216 psmouse_err(psmouse,
217 "failed to write register 0x%02x with value 0x%02x.\n",
218 reg, val);
219
220 return rc;
221}
222
223/*
224 * Dump a complete mouse movement packet to the syslog
225 */
226static void elantech_packet_dump(struct psmouse *psmouse)
227{
228 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]\n",
229 psmouse->pktsize, psmouse->packet);
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
243 if (etd->info.fw_version < 0x020000) {
244 /*
245 * byte 0: D U p1 p2 1 p3 R L
246 * byte 1: f 0 th tw x9 x8 y9 y8
247 */
248 fingers = ((packet[1] & 0x80) >> 7) +
249 ((packet[1] & 0x30) >> 4);
250 } else {
251 /*
252 * byte 0: n1 n0 p2 p1 1 p3 R L
253 * byte 1: 0 0 0 0 x9 x8 y9 y8
254 */
255 fingers = (packet[0] & 0xc0) >> 6;
256 }
257
258 if (etd->info.jumpy_cursor) {
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++;
264 elantech_debug("discarding packet\n");
265 return;
266 }
267 }
268
269 input_report_key(dev, BTN_TOUCH, fingers != 0);
270
271 /*
272 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
273 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
274 */
275 if (fingers) {
276 input_report_abs(dev, ABS_X,
277 ((packet[1] & 0x0c) << 6) | packet[2]);
278 input_report_abs(dev, ABS_Y,
279 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
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
286 psmouse_report_standard_buttons(dev, packet[0]);
287
288 if (etd->info.fw_version < 0x020000 &&
289 (etd->info.capabilities[0] & ETP_CAP_HAS_ROCKER)) {
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
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
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{
326 struct elantech_data *etd = psmouse->private;
327 struct input_dev *dev = psmouse->dev;
328 unsigned char *packet = psmouse->packet;
329 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
330 unsigned int width = 0, pres = 0;
331
332 /* byte 0: n1 n0 . . . . R L */
333 fingers = (packet[0] & 0xc0) >> 6;
334
335 switch (fingers) {
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 /* fall through */
344 case 1:
345 /*
346 * byte 1: . . . . x11 x10 x9 x8
347 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
348 */
349 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
350 /*
351 * byte 4: . . . . y11 y10 y9 y8
352 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
353 */
354 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
355
356 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
357 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
358 break;
359
360 case 2:
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 */
367 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
368 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
369 y1 = etd->y_max -
370 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
371 /*
372 * byte 3: . . by8 bx8 . . . .
373 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
374 */
375 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
376 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
377 y2 = etd->y_max -
378 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
379
380 /* Unknown so just report sensible values */
381 pres = 127;
382 width = 7;
383 break;
384 }
385
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 }
391 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
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);
395 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
396 psmouse_report_standard_buttons(dev, packet[0]);
397 if (etd->info.reports_pressure) {
398 input_report_abs(dev, ABS_PRESSURE, pres);
399 input_report_abs(dev, ABS_TOOL_WIDTH, width);
400 }
401
402 input_sync(dev);
403}
404
405static void elantech_report_trackpoint(struct psmouse *psmouse,
406 int packet_type)
407{
408 /*
409 * byte 0: 0 0 sx sy 0 M R L
410 * byte 1:~sx 0 0 0 0 0 0 0
411 * byte 2:~sy 0 0 0 0 0 0 0
412 * byte 3: 0 0 ~sy ~sx 0 1 1 0
413 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0
414 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
415 *
416 * x and y are written in two's complement spread
417 * over 9 bits with sx/sy the relative top bit and
418 * x7..x0 and y7..y0 the lower bits.
419 * The sign of y is opposite to what the input driver
420 * expects for a relative movement
421 */
422
423 struct elantech_data *etd = psmouse->private;
424 struct input_dev *tp_dev = etd->tp_dev;
425 unsigned char *packet = psmouse->packet;
426 int x, y;
427 u32 t;
428
429 t = get_unaligned_le32(&packet[0]);
430
431 switch (t & ~7U) {
432 case 0x06000030U:
433 case 0x16008020U:
434 case 0x26800010U:
435 case 0x36808000U:
436 x = packet[4] - (int)((packet[1]^0x80) << 1);
437 y = (int)((packet[2]^0x80) << 1) - packet[5];
438
439 psmouse_report_standard_buttons(tp_dev, packet[0]);
440
441 input_report_rel(tp_dev, REL_X, x);
442 input_report_rel(tp_dev, REL_Y, y);
443
444 input_sync(tp_dev);
445
446 break;
447
448 default:
449 /* Dump unexpected packet sequences if debug=1 (default) */
450 if (etd->info.debug == 1)
451 elantech_packet_dump(psmouse);
452
453 break;
454 }
455}
456
457/*
458 * Interpret complete data packets and report absolute mode input events for
459 * hardware version 3. (12 byte packets for two fingers)
460 */
461static void elantech_report_absolute_v3(struct psmouse *psmouse,
462 int packet_type)
463{
464 struct input_dev *dev = psmouse->dev;
465 struct elantech_data *etd = psmouse->private;
466 unsigned char *packet = psmouse->packet;
467 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
468 unsigned int width = 0, pres = 0;
469
470 /* byte 0: n1 n0 . . . . R L */
471 fingers = (packet[0] & 0xc0) >> 6;
472
473 switch (fingers) {
474 case 3:
475 case 1:
476 /*
477 * byte 1: . . . . x11 x10 x9 x8
478 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
479 */
480 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
481 /*
482 * byte 4: . . . . y11 y10 y9 y8
483 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
484 */
485 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
486 break;
487
488 case 2:
489 if (packet_type == PACKET_V3_HEAD) {
490 /*
491 * byte 1: . . . . ax11 ax10 ax9 ax8
492 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
493 */
494 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
495 /*
496 * byte 4: . . . . ay11 ay10 ay9 ay8
497 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
498 */
499 etd->mt[0].y = etd->y_max -
500 (((packet[4] & 0x0f) << 8) | packet[5]);
501 /*
502 * wait for next packet
503 */
504 return;
505 }
506
507 /* packet_type == PACKET_V3_TAIL */
508 x1 = etd->mt[0].x;
509 y1 = etd->mt[0].y;
510 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
511 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
512 break;
513 }
514
515 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
516 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
517
518 input_report_key(dev, BTN_TOUCH, fingers != 0);
519 if (fingers != 0) {
520 input_report_abs(dev, ABS_X, x1);
521 input_report_abs(dev, ABS_Y, y1);
522 }
523 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
524 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
525 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
526 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
527
528 /* For clickpads map both buttons to BTN_LEFT */
529 if (etd->info.fw_version & 0x001000)
530 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
531 else
532 psmouse_report_standard_buttons(dev, packet[0]);
533
534 input_report_abs(dev, ABS_PRESSURE, pres);
535 input_report_abs(dev, ABS_TOOL_WIDTH, width);
536
537 input_sync(dev);
538}
539
540static void elantech_input_sync_v4(struct psmouse *psmouse)
541{
542 struct input_dev *dev = psmouse->dev;
543 struct elantech_data *etd = psmouse->private;
544 unsigned char *packet = psmouse->packet;
545
546 /* For clickpads map both buttons to BTN_LEFT */
547 if (etd->info.fw_version & 0x001000)
548 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
549 else
550 psmouse_report_standard_buttons(dev, packet[0]);
551
552 input_mt_report_pointer_emulation(dev, true);
553 input_sync(dev);
554}
555
556static void process_packet_status_v4(struct psmouse *psmouse)
557{
558 struct input_dev *dev = psmouse->dev;
559 unsigned char *packet = psmouse->packet;
560 unsigned fingers;
561 int i;
562
563 /* notify finger state change */
564 fingers = packet[1] & 0x1f;
565 for (i = 0; i < ETP_MAX_FINGERS; i++) {
566 if ((fingers & (1 << i)) == 0) {
567 input_mt_slot(dev, i);
568 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
569 }
570 }
571
572 elantech_input_sync_v4(psmouse);
573}
574
575static void process_packet_head_v4(struct psmouse *psmouse)
576{
577 struct input_dev *dev = psmouse->dev;
578 struct elantech_data *etd = psmouse->private;
579 unsigned char *packet = psmouse->packet;
580 int id = ((packet[3] & 0xe0) >> 5) - 1;
581 int pres, traces;
582
583 if (id < 0)
584 return;
585
586 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
587 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
588 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
589 traces = (packet[0] & 0xf0) >> 4;
590
591 input_mt_slot(dev, id);
592 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
593
594 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
595 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
596 input_report_abs(dev, ABS_MT_PRESSURE, pres);
597 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
598 /* report this for backwards compatibility */
599 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
600
601 elantech_input_sync_v4(psmouse);
602}
603
604static void process_packet_motion_v4(struct psmouse *psmouse)
605{
606 struct input_dev *dev = psmouse->dev;
607 struct elantech_data *etd = psmouse->private;
608 unsigned char *packet = psmouse->packet;
609 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
610 int id, sid;
611
612 id = ((packet[0] & 0xe0) >> 5) - 1;
613 if (id < 0)
614 return;
615
616 sid = ((packet[3] & 0xe0) >> 5) - 1;
617 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
618 /*
619 * Motion packets give us the delta of x, y values of specific fingers,
620 * but in two's complement. Let the compiler do the conversion for us.
621 * Also _enlarge_ the numbers to int, in case of overflow.
622 */
623 delta_x1 = (signed char)packet[1];
624 delta_y1 = (signed char)packet[2];
625 delta_x2 = (signed char)packet[4];
626 delta_y2 = (signed char)packet[5];
627
628 etd->mt[id].x += delta_x1 * weight;
629 etd->mt[id].y -= delta_y1 * weight;
630 input_mt_slot(dev, id);
631 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
632 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
633
634 if (sid >= 0) {
635 etd->mt[sid].x += delta_x2 * weight;
636 etd->mt[sid].y -= delta_y2 * weight;
637 input_mt_slot(dev, sid);
638 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
639 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
640 }
641
642 elantech_input_sync_v4(psmouse);
643}
644
645static void elantech_report_absolute_v4(struct psmouse *psmouse,
646 int packet_type)
647{
648 switch (packet_type) {
649 case PACKET_V4_STATUS:
650 process_packet_status_v4(psmouse);
651 break;
652
653 case PACKET_V4_HEAD:
654 process_packet_head_v4(psmouse);
655 break;
656
657 case PACKET_V4_MOTION:
658 process_packet_motion_v4(psmouse);
659 break;
660
661 case PACKET_UNKNOWN:
662 default:
663 /* impossible to get here */
664 break;
665 }
666}
667
668static int elantech_packet_check_v1(struct psmouse *psmouse)
669{
670 struct elantech_data *etd = psmouse->private;
671 unsigned char *packet = psmouse->packet;
672 unsigned char p1, p2, p3;
673
674 /* Parity bits are placed differently */
675 if (etd->info.fw_version < 0x020000) {
676 /* byte 0: D U p1 p2 1 p3 R L */
677 p1 = (packet[0] & 0x20) >> 5;
678 p2 = (packet[0] & 0x10) >> 4;
679 } else {
680 /* byte 0: n1 n0 p2 p1 1 p3 R L */
681 p1 = (packet[0] & 0x10) >> 4;
682 p2 = (packet[0] & 0x20) >> 5;
683 }
684
685 p3 = (packet[0] & 0x04) >> 2;
686
687 return etd->parity[packet[1]] == p1 &&
688 etd->parity[packet[2]] == p2 &&
689 etd->parity[packet[3]] == p3;
690}
691
692static int elantech_debounce_check_v2(struct psmouse *psmouse)
693{
694 /*
695 * When we encounter packet that matches this exactly, it means the
696 * hardware is in debounce status. Just ignore the whole packet.
697 */
698 static const u8 debounce_packet[] = {
699 0x84, 0xff, 0xff, 0x02, 0xff, 0xff
700 };
701 unsigned char *packet = psmouse->packet;
702
703 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
704}
705
706static int elantech_packet_check_v2(struct psmouse *psmouse)
707{
708 struct elantech_data *etd = psmouse->private;
709 unsigned char *packet = psmouse->packet;
710
711 /*
712 * V2 hardware has two flavors. Older ones that do not report pressure,
713 * and newer ones that reports pressure and width. With newer ones, all
714 * packets (1, 2, 3 finger touch) have the same constant bits. With
715 * older ones, 1/3 finger touch packets and 2 finger touch packets
716 * have different constant bits.
717 * With all three cases, if the constant bits are not exactly what I
718 * expected, I consider them invalid.
719 */
720 if (etd->info.reports_pressure)
721 return (packet[0] & 0x0c) == 0x04 &&
722 (packet[3] & 0x0f) == 0x02;
723
724 if ((packet[0] & 0xc0) == 0x80)
725 return (packet[0] & 0x0c) == 0x0c &&
726 (packet[3] & 0x0e) == 0x08;
727
728 return (packet[0] & 0x3c) == 0x3c &&
729 (packet[1] & 0xf0) == 0x00 &&
730 (packet[3] & 0x3e) == 0x38 &&
731 (packet[4] & 0xf0) == 0x00;
732}
733
734/*
735 * We check the constant bits to determine what packet type we get,
736 * so packet checking is mandatory for v3 and later hardware.
737 */
738static int elantech_packet_check_v3(struct psmouse *psmouse)
739{
740 struct elantech_data *etd = psmouse->private;
741 static const u8 debounce_packet[] = {
742 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff
743 };
744 unsigned char *packet = psmouse->packet;
745
746 /*
747 * check debounce first, it has the same signature in byte 0
748 * and byte 3 as PACKET_V3_HEAD.
749 */
750 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
751 return PACKET_DEBOUNCE;
752
753 /*
754 * If the hardware flag 'crc_enabled' is set the packets have
755 * different signatures.
756 */
757 if (etd->info.crc_enabled) {
758 if ((packet[3] & 0x09) == 0x08)
759 return PACKET_V3_HEAD;
760
761 if ((packet[3] & 0x09) == 0x09)
762 return PACKET_V3_TAIL;
763 } else {
764 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
765 return PACKET_V3_HEAD;
766
767 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
768 return PACKET_V3_TAIL;
769 if ((packet[3] & 0x0f) == 0x06)
770 return PACKET_TRACKPOINT;
771 }
772
773 return PACKET_UNKNOWN;
774}
775
776static int elantech_packet_check_v4(struct psmouse *psmouse)
777{
778 struct elantech_data *etd = psmouse->private;
779 unsigned char *packet = psmouse->packet;
780 unsigned char packet_type = packet[3] & 0x03;
781 unsigned int ic_version;
782 bool sanity_check;
783
784 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
785 return PACKET_TRACKPOINT;
786
787 /* This represents the version of IC body. */
788 ic_version = (etd->info.fw_version & 0x0f0000) >> 16;
789
790 /*
791 * Sanity check based on the constant bits of a packet.
792 * The constant bits change depending on the value of
793 * the hardware flag 'crc_enabled' and the version of
794 * the IC body, but are the same for every packet,
795 * regardless of the type.
796 */
797 if (etd->info.crc_enabled)
798 sanity_check = ((packet[3] & 0x08) == 0x00);
799 else if (ic_version == 7 && etd->info.samples[1] == 0x2A)
800 sanity_check = ((packet[3] & 0x1c) == 0x10);
801 else
802 sanity_check = ((packet[0] & 0x08) == 0x00 &&
803 (packet[3] & 0x1c) == 0x10);
804
805 if (!sanity_check)
806 return PACKET_UNKNOWN;
807
808 switch (packet_type) {
809 case 0:
810 return PACKET_V4_STATUS;
811
812 case 1:
813 return PACKET_V4_HEAD;
814
815 case 2:
816 return PACKET_V4_MOTION;
817 }
818
819 return PACKET_UNKNOWN;
820}
821
822/*
823 * Process byte stream from mouse and handle complete packets
824 */
825static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
826{
827 struct elantech_data *etd = psmouse->private;
828 int packet_type;
829
830 if (psmouse->pktcnt < psmouse->pktsize)
831 return PSMOUSE_GOOD_DATA;
832
833 if (etd->info.debug > 1)
834 elantech_packet_dump(psmouse);
835
836 switch (etd->info.hw_version) {
837 case 1:
838 if (etd->info.paritycheck && !elantech_packet_check_v1(psmouse))
839 return PSMOUSE_BAD_DATA;
840
841 elantech_report_absolute_v1(psmouse);
842 break;
843
844 case 2:
845 /* ignore debounce */
846 if (elantech_debounce_check_v2(psmouse))
847 return PSMOUSE_FULL_PACKET;
848
849 if (etd->info.paritycheck && !elantech_packet_check_v2(psmouse))
850 return PSMOUSE_BAD_DATA;
851
852 elantech_report_absolute_v2(psmouse);
853 break;
854
855 case 3:
856 packet_type = elantech_packet_check_v3(psmouse);
857 switch (packet_type) {
858 case PACKET_UNKNOWN:
859 return PSMOUSE_BAD_DATA;
860
861 case PACKET_DEBOUNCE:
862 /* ignore debounce */
863 break;
864
865 case PACKET_TRACKPOINT:
866 elantech_report_trackpoint(psmouse, packet_type);
867 break;
868
869 default:
870 elantech_report_absolute_v3(psmouse, packet_type);
871 break;
872 }
873
874 break;
875
876 case 4:
877 packet_type = elantech_packet_check_v4(psmouse);
878 switch (packet_type) {
879 case PACKET_UNKNOWN:
880 return PSMOUSE_BAD_DATA;
881
882 case PACKET_TRACKPOINT:
883 elantech_report_trackpoint(psmouse, packet_type);
884 break;
885
886 default:
887 elantech_report_absolute_v4(psmouse, packet_type);
888 break;
889 }
890
891 break;
892 }
893
894 return PSMOUSE_FULL_PACKET;
895}
896
897/*
898 * This writes the reg_07 value again to the hardware at the end of every
899 * set_rate call because the register loses its value. reg_07 allows setting
900 * absolute mode on v4 hardware
901 */
902static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse,
903 unsigned int rate)
904{
905 struct elantech_data *etd = psmouse->private;
906
907 etd->original_set_rate(psmouse, rate);
908 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
909 psmouse_err(psmouse, "restoring reg_07 failed\n");
910}
911
912/*
913 * Put the touchpad into absolute mode
914 */
915static int elantech_set_absolute_mode(struct psmouse *psmouse)
916{
917 struct elantech_data *etd = psmouse->private;
918 unsigned char val;
919 int tries = ETP_READ_BACK_TRIES;
920 int rc = 0;
921
922 switch (etd->info.hw_version) {
923 case 1:
924 etd->reg_10 = 0x16;
925 etd->reg_11 = 0x8f;
926 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
927 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
928 rc = -1;
929 }
930 break;
931
932 case 2:
933 /* Windows driver values */
934 etd->reg_10 = 0x54;
935 etd->reg_11 = 0x88; /* 0x8a */
936 etd->reg_21 = 0x60; /* 0x00 */
937 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
938 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
939 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
940 rc = -1;
941 }
942 break;
943
944 case 3:
945 if (etd->info.set_hw_resolution)
946 etd->reg_10 = 0x0b;
947 else
948 etd->reg_10 = 0x01;
949
950 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
951 rc = -1;
952
953 break;
954
955 case 4:
956 etd->reg_07 = 0x01;
957 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
958 rc = -1;
959
960 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
961 }
962
963 if (rc == 0) {
964 /*
965 * Read back reg 0x10. For hardware version 1 we must make
966 * sure the absolute mode bit is set. For hardware version 2
967 * the touchpad is probably initializing and not ready until
968 * we read back the value we just wrote.
969 */
970 do {
971 rc = elantech_read_reg(psmouse, 0x10, &val);
972 if (rc == 0)
973 break;
974 tries--;
975 elantech_debug("retrying read (%d).\n", tries);
976 msleep(ETP_READ_BACK_DELAY);
977 } while (tries > 0);
978
979 if (rc) {
980 psmouse_err(psmouse,
981 "failed to read back register 0x10.\n");
982 } else if (etd->info.hw_version == 1 &&
983 !(val & ETP_R10_ABSOLUTE_MODE)) {
984 psmouse_err(psmouse,
985 "touchpad refuses to switch to absolute mode.\n");
986 rc = -1;
987 }
988 }
989
990 skip_readback_reg_10:
991 if (rc)
992 psmouse_err(psmouse, "failed to initialise registers.\n");
993
994 return rc;
995}
996
997static int elantech_set_range(struct psmouse *psmouse,
998 unsigned int *x_min, unsigned int *y_min,
999 unsigned int *x_max, unsigned int *y_max,
1000 unsigned int *width)
1001{
1002 struct elantech_data *etd = psmouse->private;
1003 struct elantech_device_info *info = &etd->info;
1004 unsigned char param[3];
1005 unsigned char traces;
1006
1007 switch (info->hw_version) {
1008 case 1:
1009 *x_min = ETP_XMIN_V1;
1010 *y_min = ETP_YMIN_V1;
1011 *x_max = ETP_XMAX_V1;
1012 *y_max = ETP_YMAX_V1;
1013 break;
1014
1015 case 2:
1016 if (info->fw_version == 0x020800 ||
1017 info->fw_version == 0x020b00 ||
1018 info->fw_version == 0x020030) {
1019 *x_min = ETP_XMIN_V2;
1020 *y_min = ETP_YMIN_V2;
1021 *x_max = ETP_XMAX_V2;
1022 *y_max = ETP_YMAX_V2;
1023 } else {
1024 int i;
1025 int fixed_dpi;
1026
1027 i = (info->fw_version > 0x020800 &&
1028 info->fw_version < 0x020900) ? 1 : 2;
1029
1030 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1031 return -1;
1032
1033 fixed_dpi = param[1] & 0x10;
1034
1035 if (((info->fw_version >> 16) == 0x14) && fixed_dpi) {
1036 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
1037 return -1;
1038
1039 *x_max = (info->capabilities[1] - i) * param[1] / 2;
1040 *y_max = (info->capabilities[2] - i) * param[2] / 2;
1041 } else if (info->fw_version == 0x040216) {
1042 *x_max = 819;
1043 *y_max = 405;
1044 } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) {
1045 *x_max = 900;
1046 *y_max = 500;
1047 } else {
1048 *x_max = (info->capabilities[1] - i) * 64;
1049 *y_max = (info->capabilities[2] - i) * 64;
1050 }
1051 }
1052 break;
1053
1054 case 3:
1055 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1056 return -1;
1057
1058 *x_max = (0x0f & param[0]) << 8 | param[1];
1059 *y_max = (0xf0 & param[0]) << 4 | param[2];
1060 break;
1061
1062 case 4:
1063 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1064 return -1;
1065
1066 *x_max = (0x0f & param[0]) << 8 | param[1];
1067 *y_max = (0xf0 & param[0]) << 4 | param[2];
1068 traces = info->capabilities[1];
1069 if ((traces < 2) || (traces > *x_max))
1070 return -1;
1071
1072 *width = *x_max / (traces - 1);
1073 break;
1074 }
1075
1076 return 0;
1077}
1078
1079/*
1080 * (value from firmware) * 10 + 790 = dpi
1081 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
1082 */
1083static unsigned int elantech_convert_res(unsigned int val)
1084{
1085 return (val * 10 + 790) * 10 / 254;
1086}
1087
1088static int elantech_get_resolution_v4(struct psmouse *psmouse,
1089 unsigned int *x_res,
1090 unsigned int *y_res,
1091 unsigned int *bus)
1092{
1093 unsigned char param[3];
1094
1095 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
1096 return -1;
1097
1098 *x_res = elantech_convert_res(param[1] & 0x0f);
1099 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
1100 *bus = param[2];
1101
1102 return 0;
1103}
1104
1105/*
1106 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
1107 * fw_version for this is based on the following fw_version & caps table:
1108 *
1109 * Laptop-model: fw_version: caps: buttons:
1110 * Acer S3 0x461f00 10, 13, 0e clickpad
1111 * Acer S7-392 0x581f01 50, 17, 0d clickpad
1112 * Acer V5-131 0x461f02 01, 16, 0c clickpad
1113 * Acer V5-551 0x461f00 ? clickpad
1114 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons
1115 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons
1116 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons
1117 * Asus TP500LN 0x381f17 10, 14, 0e clickpad
1118 * Asus X750JN 0x381f17 10, 14, 0e clickpad
1119 * Asus UX31 0x361f00 20, 15, 0e clickpad
1120 * Asus UX32VD 0x361f02 00, 15, 0e clickpad
1121 * Avatar AVIU-145A2 0x361f00 ? clickpad
1122 * Fujitsu CELSIUS H760 0x570f02 40, 14, 0c 3 hw buttons (**)
1123 * Fujitsu CELSIUS H780 0x5d0f02 41, 16, 0d 3 hw buttons (**)
1124 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons
1125 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons
1126 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons
1127 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons
1128 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons
1129 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons
1130 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**)
1131 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons
1132 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*)
1133 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*)
1134 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons
1135 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad
1136 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad
1137 * Samsung NP900X3E-A02 0x575f03 ? clickpad
1138 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad
1139 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons
1140 * Samsung RF710 0x450f00 ? 2 hw buttons
1141 * System76 Pangolin 0x250f01 ? 2 hw buttons
1142 * (*) + 3 trackpoint buttons
1143 * (**) + 0 trackpoint buttons
1144 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps
1145 */
1146static void elantech_set_buttonpad_prop(struct psmouse *psmouse)
1147{
1148 struct input_dev *dev = psmouse->dev;
1149 struct elantech_data *etd = psmouse->private;
1150
1151 if (etd->info.fw_version & 0x001000) {
1152 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1153 __clear_bit(BTN_RIGHT, dev->keybit);
1154 }
1155}
1156
1157/*
1158 * Some hw_version 4 models do have a middle button
1159 */
1160static const struct dmi_system_id elantech_dmi_has_middle_button[] = {
1161#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1162 {
1163 /* Fujitsu H730 has a middle button */
1164 .matches = {
1165 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1166 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1167 },
1168 },
1169 {
1170 /* Fujitsu H760 also has a middle button */
1171 .matches = {
1172 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1173 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1174 },
1175 },
1176 {
1177 /* Fujitsu H780 also has a middle button */
1178 .matches = {
1179 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1180 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H780"),
1181 },
1182 },
1183#endif
1184 { }
1185};
1186
1187static const char * const middle_button_pnp_ids[] = {
1188 "LEN2131", /* ThinkPad P52 w/ NFC */
1189 "LEN2132", /* ThinkPad P52 */
1190 "LEN2133", /* ThinkPad P72 w/ NFC */
1191 "LEN2134", /* ThinkPad P72 */
1192 NULL
1193};
1194
1195/*
1196 * Set the appropriate event bits for the input subsystem
1197 */
1198static int elantech_set_input_params(struct psmouse *psmouse)
1199{
1200 struct input_dev *dev = psmouse->dev;
1201 struct elantech_data *etd = psmouse->private;
1202 struct elantech_device_info *info = &etd->info;
1203 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
1204
1205 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
1206 return -1;
1207
1208 __set_bit(INPUT_PROP_POINTER, dev->propbit);
1209 __set_bit(EV_KEY, dev->evbit);
1210 __set_bit(EV_ABS, dev->evbit);
1211 __clear_bit(EV_REL, dev->evbit);
1212
1213 __set_bit(BTN_LEFT, dev->keybit);
1214 if (dmi_check_system(elantech_dmi_has_middle_button) ||
1215 psmouse_matches_pnp_id(psmouse, middle_button_pnp_ids))
1216 __set_bit(BTN_MIDDLE, dev->keybit);
1217 __set_bit(BTN_RIGHT, dev->keybit);
1218
1219 __set_bit(BTN_TOUCH, dev->keybit);
1220 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1221 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1222 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1223
1224 switch (info->hw_version) {
1225 case 1:
1226 /* Rocker button */
1227 if (info->fw_version < 0x020000 &&
1228 (info->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
1229 __set_bit(BTN_FORWARD, dev->keybit);
1230 __set_bit(BTN_BACK, dev->keybit);
1231 }
1232 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1233 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1234 break;
1235
1236 case 2:
1237 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1238 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1239 /* fall through */
1240 case 3:
1241 if (info->hw_version == 3)
1242 elantech_set_buttonpad_prop(psmouse);
1243 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1244 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1245 if (info->reports_pressure) {
1246 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1247 ETP_PMAX_V2, 0, 0);
1248 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1249 ETP_WMAX_V2, 0, 0);
1250 }
1251 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT);
1252 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1253 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1254 break;
1255
1256 case 4:
1257 elantech_set_buttonpad_prop(psmouse);
1258 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1259 /* For X to recognize me as touchpad. */
1260 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1261 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1262 /*
1263 * range of pressure and width is the same as v2,
1264 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1265 */
1266 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1267 ETP_PMAX_V2, 0, 0);
1268 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1269 ETP_WMAX_V2, 0, 0);
1270 /* Multitouch capable pad, up to 5 fingers. */
1271 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1272 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1273 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1274 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1275 ETP_PMAX_V2, 0, 0);
1276 /*
1277 * The firmware reports how many trace lines the finger spans,
1278 * convert to surface unit as Protocol-B requires.
1279 */
1280 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1281 ETP_WMAX_V2 * width, 0, 0);
1282 break;
1283 }
1284
1285 input_abs_set_res(dev, ABS_X, info->x_res);
1286 input_abs_set_res(dev, ABS_Y, info->y_res);
1287 if (info->hw_version > 1) {
1288 input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res);
1289 input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res);
1290 }
1291
1292 etd->y_max = y_max;
1293 etd->width = width;
1294
1295 return 0;
1296}
1297
1298struct elantech_attr_data {
1299 size_t field_offset;
1300 unsigned char reg;
1301};
1302
1303/*
1304 * Display a register value by reading a sysfs entry
1305 */
1306static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1307 char *buf)
1308{
1309 struct elantech_data *etd = psmouse->private;
1310 struct elantech_attr_data *attr = data;
1311 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1312 int rc = 0;
1313
1314 if (attr->reg)
1315 rc = elantech_read_reg(psmouse, attr->reg, reg);
1316
1317 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1318}
1319
1320/*
1321 * Write a register value by writing a sysfs entry
1322 */
1323static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1324 void *data, const char *buf, size_t count)
1325{
1326 struct elantech_data *etd = psmouse->private;
1327 struct elantech_attr_data *attr = data;
1328 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1329 unsigned char value;
1330 int err;
1331
1332 err = kstrtou8(buf, 16, &value);
1333 if (err)
1334 return err;
1335
1336 /* Do we need to preserve some bits for version 2 hardware too? */
1337 if (etd->info.hw_version == 1) {
1338 if (attr->reg == 0x10)
1339 /* Force absolute mode always on */
1340 value |= ETP_R10_ABSOLUTE_MODE;
1341 else if (attr->reg == 0x11)
1342 /* Force 4 byte mode always on */
1343 value |= ETP_R11_4_BYTE_MODE;
1344 }
1345
1346 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1347 *reg = value;
1348
1349 return count;
1350}
1351
1352#define ELANTECH_INT_ATTR(_name, _register) \
1353 static struct elantech_attr_data elantech_attr_##_name = { \
1354 .field_offset = offsetof(struct elantech_data, _name), \
1355 .reg = _register, \
1356 }; \
1357 PSMOUSE_DEFINE_ATTR(_name, 0644, \
1358 &elantech_attr_##_name, \
1359 elantech_show_int_attr, \
1360 elantech_set_int_attr)
1361
1362#define ELANTECH_INFO_ATTR(_name) \
1363 static struct elantech_attr_data elantech_attr_##_name = { \
1364 .field_offset = offsetof(struct elantech_data, info) + \
1365 offsetof(struct elantech_device_info, _name), \
1366 .reg = 0, \
1367 }; \
1368 PSMOUSE_DEFINE_ATTR(_name, 0644, \
1369 &elantech_attr_##_name, \
1370 elantech_show_int_attr, \
1371 elantech_set_int_attr)
1372
1373ELANTECH_INT_ATTR(reg_07, 0x07);
1374ELANTECH_INT_ATTR(reg_10, 0x10);
1375ELANTECH_INT_ATTR(reg_11, 0x11);
1376ELANTECH_INT_ATTR(reg_20, 0x20);
1377ELANTECH_INT_ATTR(reg_21, 0x21);
1378ELANTECH_INT_ATTR(reg_22, 0x22);
1379ELANTECH_INT_ATTR(reg_23, 0x23);
1380ELANTECH_INT_ATTR(reg_24, 0x24);
1381ELANTECH_INT_ATTR(reg_25, 0x25);
1382ELANTECH_INT_ATTR(reg_26, 0x26);
1383ELANTECH_INFO_ATTR(debug);
1384ELANTECH_INFO_ATTR(paritycheck);
1385ELANTECH_INFO_ATTR(crc_enabled);
1386
1387static struct attribute *elantech_attrs[] = {
1388 &psmouse_attr_reg_07.dattr.attr,
1389 &psmouse_attr_reg_10.dattr.attr,
1390 &psmouse_attr_reg_11.dattr.attr,
1391 &psmouse_attr_reg_20.dattr.attr,
1392 &psmouse_attr_reg_21.dattr.attr,
1393 &psmouse_attr_reg_22.dattr.attr,
1394 &psmouse_attr_reg_23.dattr.attr,
1395 &psmouse_attr_reg_24.dattr.attr,
1396 &psmouse_attr_reg_25.dattr.attr,
1397 &psmouse_attr_reg_26.dattr.attr,
1398 &psmouse_attr_debug.dattr.attr,
1399 &psmouse_attr_paritycheck.dattr.attr,
1400 &psmouse_attr_crc_enabled.dattr.attr,
1401 NULL
1402};
1403
1404static const struct attribute_group elantech_attr_group = {
1405 .attrs = elantech_attrs,
1406};
1407
1408static bool elantech_is_signature_valid(const unsigned char *param)
1409{
1410 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1411 int i;
1412
1413 if (param[0] == 0)
1414 return false;
1415
1416 if (param[1] == 0)
1417 return true;
1418
1419 /*
1420 * Some hw_version >= 4 models have a revision higher then 20. Meaning
1421 * that param[2] may be 10 or 20, skip the rates check for these.
1422 */
1423 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f &&
1424 param[2] < 40)
1425 return true;
1426
1427 for (i = 0; i < ARRAY_SIZE(rates); i++)
1428 if (param[2] == rates[i])
1429 return false;
1430
1431 return true;
1432}
1433
1434/*
1435 * Use magic knock to detect Elantech touchpad
1436 */
1437int elantech_detect(struct psmouse *psmouse, bool set_properties)
1438{
1439 struct ps2dev *ps2dev = &psmouse->ps2dev;
1440 unsigned char param[3];
1441
1442 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1443
1444 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1445 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1446 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1447 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1448 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1449 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1450 return -1;
1451 }
1452
1453 /*
1454 * Report this in case there are Elantech models that use a different
1455 * set of magic numbers
1456 */
1457 if (param[0] != 0x3c || param[1] != 0x03 ||
1458 (param[2] != 0xc8 && param[2] != 0x00)) {
1459 psmouse_dbg(psmouse,
1460 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1461 param[0], param[1], param[2]);
1462 return -1;
1463 }
1464
1465 /*
1466 * Query touchpad's firmware version and see if it reports known
1467 * value to avoid mis-detection. Logitech mice are known to respond
1468 * to Elantech magic knock and there might be more.
1469 */
1470 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1471 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1472 return -1;
1473 }
1474
1475 psmouse_dbg(psmouse,
1476 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1477 param[0], param[1], param[2]);
1478
1479 if (!elantech_is_signature_valid(param)) {
1480 psmouse_dbg(psmouse,
1481 "Probably not a real Elantech touchpad. Aborting.\n");
1482 return -1;
1483 }
1484
1485 if (set_properties) {
1486 psmouse->vendor = "Elantech";
1487 psmouse->name = "Touchpad";
1488 }
1489
1490 return 0;
1491}
1492
1493/*
1494 * Clean up sysfs entries when disconnecting
1495 */
1496static void elantech_disconnect(struct psmouse *psmouse)
1497{
1498 struct elantech_data *etd = psmouse->private;
1499
1500 /*
1501 * We might have left a breadcrumb when trying to
1502 * set up SMbus companion.
1503 */
1504 psmouse_smbus_cleanup(psmouse);
1505
1506 if (etd->tp_dev)
1507 input_unregister_device(etd->tp_dev);
1508 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1509 &elantech_attr_group);
1510 kfree(psmouse->private);
1511 psmouse->private = NULL;
1512}
1513
1514/*
1515 * Put the touchpad back into absolute mode when reconnecting
1516 */
1517static int elantech_reconnect(struct psmouse *psmouse)
1518{
1519 psmouse_reset(psmouse);
1520
1521 if (elantech_detect(psmouse, 0))
1522 return -1;
1523
1524 if (elantech_set_absolute_mode(psmouse)) {
1525 psmouse_err(psmouse,
1526 "failed to put touchpad back into absolute mode.\n");
1527 return -1;
1528 }
1529
1530 return 0;
1531}
1532
1533/*
1534 * Some hw_version 4 models do not work with crc_disabled
1535 */
1536static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
1537#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1538 {
1539 /* Fujitsu H730 does not work with crc_enabled == 0 */
1540 .matches = {
1541 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1542 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1543 },
1544 },
1545 {
1546 /* Fujitsu H760 does not work with crc_enabled == 0 */
1547 .matches = {
1548 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1549 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1550 },
1551 },
1552 {
1553 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */
1554 .matches = {
1555 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1556 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
1557 },
1558 },
1559 {
1560 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */
1561 .matches = {
1562 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1563 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"),
1564 },
1565 },
1566 {
1567 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */
1568 .matches = {
1569 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1570 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"),
1571 },
1572 },
1573 {
1574 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */
1575 .matches = {
1576 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1577 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"),
1578 },
1579 },
1580 {
1581 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */
1582 .matches = {
1583 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1584 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"),
1585 },
1586 },
1587 {
1588 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */
1589 .matches = {
1590 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1591 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"),
1592 },
1593 },
1594 {
1595 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
1596 .matches = {
1597 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1598 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
1599 },
1600 },
1601#endif
1602 { }
1603};
1604
1605/*
1606 * Some hw_version 3 models go into error state when we try to set
1607 * bit 3 and/or bit 1 of r10.
1608 */
1609static const struct dmi_system_id no_hw_res_dmi_table[] = {
1610#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1611 {
1612 /* Gigabyte U2442 */
1613 .matches = {
1614 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1615 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1616 },
1617 },
1618#endif
1619 { }
1620};
1621
1622/*
1623 * determine hardware version and set some properties according to it.
1624 */
1625static int elantech_set_properties(struct elantech_device_info *info)
1626{
1627 /* This represents the version of IC body. */
1628 int ver = (info->fw_version & 0x0f0000) >> 16;
1629
1630 /* Early version of Elan touchpads doesn't obey the rule. */
1631 if (info->fw_version < 0x020030 || info->fw_version == 0x020600)
1632 info->hw_version = 1;
1633 else {
1634 switch (ver) {
1635 case 2:
1636 case 4:
1637 info->hw_version = 2;
1638 break;
1639 case 5:
1640 info->hw_version = 3;
1641 break;
1642 case 6 ... 15:
1643 info->hw_version = 4;
1644 break;
1645 default:
1646 return -1;
1647 }
1648 }
1649
1650 /* decide which send_cmd we're gonna use early */
1651 info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd :
1652 synaptics_send_cmd;
1653
1654 /* Turn on packet checking by default */
1655 info->paritycheck = 1;
1656
1657 /*
1658 * This firmware suffers from misreporting coordinates when
1659 * a touch action starts causing the mouse cursor or scrolled page
1660 * to jump. Enable a workaround.
1661 */
1662 info->jumpy_cursor =
1663 (info->fw_version == 0x020022 || info->fw_version == 0x020600);
1664
1665 if (info->hw_version > 1) {
1666 /* For now show extra debug information */
1667 info->debug = 1;
1668
1669 if (info->fw_version >= 0x020800)
1670 info->reports_pressure = true;
1671 }
1672
1673 /*
1674 * The signatures of v3 and v4 packets change depending on the
1675 * value of this hardware flag.
1676 */
1677 info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 ||
1678 dmi_check_system(elantech_dmi_force_crc_enabled);
1679
1680 /* Enable real hardware resolution on hw_version 3 ? */
1681 info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1682
1683 return 0;
1684}
1685
1686static int elantech_query_info(struct psmouse *psmouse,
1687 struct elantech_device_info *info)
1688{
1689 unsigned char param[3];
1690
1691 memset(info, 0, sizeof(*info));
1692
1693 /*
1694 * Do the version query again so we can store the result
1695 */
1696 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1697 psmouse_err(psmouse, "failed to query firmware version.\n");
1698 return -EINVAL;
1699 }
1700 info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1701
1702 if (elantech_set_properties(info)) {
1703 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1704 return -EINVAL;
1705 }
1706 psmouse_info(psmouse,
1707 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1708 info->hw_version, param[0], param[1], param[2]);
1709
1710 if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1711 info->capabilities)) {
1712 psmouse_err(psmouse, "failed to query capabilities.\n");
1713 return -EINVAL;
1714 }
1715 psmouse_info(psmouse,
1716 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1717 info->capabilities[0], info->capabilities[1],
1718 info->capabilities[2]);
1719
1720 if (info->hw_version != 1) {
1721 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) {
1722 psmouse_err(psmouse, "failed to query sample data\n");
1723 return -EINVAL;
1724 }
1725 psmouse_info(psmouse,
1726 "Elan sample query result %02x, %02x, %02x\n",
1727 info->samples[0],
1728 info->samples[1],
1729 info->samples[2]);
1730 }
1731
1732 if (info->samples[1] == 0x74 && info->hw_version == 0x03) {
1733 /*
1734 * This module has a bug which makes absolute mode
1735 * unusable, so let's abort so we'll be using standard
1736 * PS/2 protocol.
1737 */
1738 psmouse_info(psmouse,
1739 "absolute mode broken, forcing standard PS/2 protocol\n");
1740 return -ENODEV;
1741 }
1742
1743 /* The MSB indicates the presence of the trackpoint */
1744 info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80;
1745
1746 info->x_res = 31;
1747 info->y_res = 31;
1748 if (info->hw_version == 4) {
1749 if (elantech_get_resolution_v4(psmouse,
1750 &info->x_res,
1751 &info->y_res,
1752 &info->bus)) {
1753 psmouse_warn(psmouse,
1754 "failed to query resolution data.\n");
1755 }
1756 }
1757
1758 return 0;
1759}
1760
1761#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
1762
1763/*
1764 * The newest Elantech device can use a secondary bus (over SMBus) which
1765 * provides a better bandwidth and allow a better control of the touchpads.
1766 * This is used to decide if we need to use this bus or not.
1767 */
1768enum {
1769 ELANTECH_SMBUS_NOT_SET = -1,
1770 ELANTECH_SMBUS_OFF,
1771 ELANTECH_SMBUS_ON,
1772};
1773
1774static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ?
1775 ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF;
1776module_param_named(elantech_smbus, elantech_smbus, int, 0644);
1777MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device.");
1778
1779static const char * const i2c_blacklist_pnp_ids[] = {
1780 /*
1781 * These are known to not be working properly as bits are missing
1782 * in elan_i2c.
1783 */
1784 "LEN2131", /* ThinkPad P52 w/ NFC */
1785 "LEN2132", /* ThinkPad P52 */
1786 "LEN2133", /* ThinkPad P72 w/ NFC */
1787 "LEN2134", /* ThinkPad P72 */
1788 NULL
1789};
1790
1791static int elantech_create_smbus(struct psmouse *psmouse,
1792 struct elantech_device_info *info,
1793 bool leave_breadcrumbs)
1794{
1795 const struct property_entry i2c_properties[] = {
1796 PROPERTY_ENTRY_BOOL("elan,trackpoint"),
1797 { },
1798 };
1799 struct i2c_board_info smbus_board = {
1800 I2C_BOARD_INFO("elan_i2c", 0x15),
1801 .flags = I2C_CLIENT_HOST_NOTIFY,
1802 };
1803
1804 if (info->has_trackpoint)
1805 smbus_board.properties = i2c_properties;
1806
1807 return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false,
1808 leave_breadcrumbs);
1809}
1810
1811/**
1812 * elantech_setup_smbus - called once the PS/2 devices are enumerated
1813 * and decides to instantiate a SMBus InterTouch device.
1814 */
1815static int elantech_setup_smbus(struct psmouse *psmouse,
1816 struct elantech_device_info *info,
1817 bool leave_breadcrumbs)
1818{
1819 int error;
1820
1821 if (elantech_smbus == ELANTECH_SMBUS_OFF)
1822 return -ENXIO;
1823
1824 if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) {
1825 /*
1826 * New ICs are enabled by default, unless mentioned in
1827 * i2c_blacklist_pnp_ids.
1828 * Old ICs are up to the user to decide.
1829 */
1830 if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) ||
1831 psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids))
1832 return -ENXIO;
1833 }
1834
1835 psmouse_info(psmouse, "Trying to set up SMBus access\n");
1836
1837 error = elantech_create_smbus(psmouse, info, leave_breadcrumbs);
1838 if (error) {
1839 if (error == -EAGAIN)
1840 psmouse_info(psmouse, "SMbus companion is not ready yet\n");
1841 else
1842 psmouse_err(psmouse, "unable to create intertouch device\n");
1843
1844 return error;
1845 }
1846
1847 return 0;
1848}
1849
1850static bool elantech_use_host_notify(struct psmouse *psmouse,
1851 struct elantech_device_info *info)
1852{
1853 if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version))
1854 return true;
1855
1856 switch (info->bus) {
1857 case ETP_BUS_PS2_ONLY:
1858 /* expected case */
1859 break;
1860 case ETP_BUS_SMB_ALERT_ONLY:
1861 /* fall-through */
1862 case ETP_BUS_PS2_SMB_ALERT:
1863 psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n");
1864 break;
1865 case ETP_BUS_SMB_HST_NTFY_ONLY:
1866 /* fall-through */
1867 case ETP_BUS_PS2_SMB_HST_NTFY:
1868 return true;
1869 default:
1870 psmouse_dbg(psmouse,
1871 "Ignoring SMBus bus provider %d.\n",
1872 info->bus);
1873 }
1874
1875 return false;
1876}
1877
1878int elantech_init_smbus(struct psmouse *psmouse)
1879{
1880 struct elantech_device_info info;
1881 int error = -EINVAL;
1882
1883 psmouse_reset(psmouse);
1884
1885 error = elantech_query_info(psmouse, &info);
1886 if (error)
1887 goto init_fail;
1888
1889 if (info.hw_version < 4) {
1890 error = -ENXIO;
1891 goto init_fail;
1892 }
1893
1894 return elantech_create_smbus(psmouse, &info, false);
1895 init_fail:
1896 psmouse_reset(psmouse);
1897 return error;
1898}
1899#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
1900
1901/*
1902 * Initialize the touchpad and create sysfs entries
1903 */
1904static int elantech_setup_ps2(struct psmouse *psmouse,
1905 struct elantech_device_info *info)
1906{
1907 struct elantech_data *etd;
1908 int i;
1909 int error = -EINVAL;
1910 struct input_dev *tp_dev;
1911
1912 psmouse->private = etd = kzalloc(sizeof(*etd), GFP_KERNEL);
1913 if (!etd)
1914 return -ENOMEM;
1915
1916 etd->info = *info;
1917
1918 etd->parity[0] = 1;
1919 for (i = 1; i < 256; i++)
1920 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1921
1922 if (elantech_set_absolute_mode(psmouse)) {
1923 psmouse_err(psmouse,
1924 "failed to put touchpad into absolute mode.\n");
1925 goto init_fail;
1926 }
1927
1928 if (info->fw_version == 0x381f17) {
1929 etd->original_set_rate = psmouse->set_rate;
1930 psmouse->set_rate = elantech_set_rate_restore_reg_07;
1931 }
1932
1933 if (elantech_set_input_params(psmouse)) {
1934 psmouse_err(psmouse, "failed to query touchpad range.\n");
1935 goto init_fail;
1936 }
1937
1938 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1939 &elantech_attr_group);
1940 if (error) {
1941 psmouse_err(psmouse,
1942 "failed to create sysfs attributes, error: %d.\n",
1943 error);
1944 goto init_fail;
1945 }
1946
1947 if (info->has_trackpoint) {
1948 tp_dev = input_allocate_device();
1949
1950 if (!tp_dev) {
1951 error = -ENOMEM;
1952 goto init_fail_tp_alloc;
1953 }
1954
1955 etd->tp_dev = tp_dev;
1956 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
1957 psmouse->ps2dev.serio->phys);
1958 tp_dev->phys = etd->tp_phys;
1959 tp_dev->name = "ETPS/2 Elantech TrackPoint";
1960 tp_dev->id.bustype = BUS_I8042;
1961 tp_dev->id.vendor = 0x0002;
1962 tp_dev->id.product = PSMOUSE_ELANTECH;
1963 tp_dev->id.version = 0x0000;
1964 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1965 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
1966 tp_dev->relbit[BIT_WORD(REL_X)] =
1967 BIT_MASK(REL_X) | BIT_MASK(REL_Y);
1968 tp_dev->keybit[BIT_WORD(BTN_LEFT)] =
1969 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
1970 BIT_MASK(BTN_RIGHT);
1971
1972 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit);
1973 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit);
1974
1975 error = input_register_device(etd->tp_dev);
1976 if (error < 0)
1977 goto init_fail_tp_reg;
1978 }
1979
1980 psmouse->protocol_handler = elantech_process_byte;
1981 psmouse->disconnect = elantech_disconnect;
1982 psmouse->reconnect = elantech_reconnect;
1983 psmouse->pktsize = info->hw_version > 1 ? 6 : 4;
1984
1985 return 0;
1986 init_fail_tp_reg:
1987 input_free_device(tp_dev);
1988 init_fail_tp_alloc:
1989 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1990 &elantech_attr_group);
1991 init_fail:
1992 kfree(etd);
1993 return error;
1994}
1995
1996int elantech_init_ps2(struct psmouse *psmouse)
1997{
1998 struct elantech_device_info info;
1999 int error = -EINVAL;
2000
2001 psmouse_reset(psmouse);
2002
2003 error = elantech_query_info(psmouse, &info);
2004 if (error)
2005 goto init_fail;
2006
2007 error = elantech_setup_ps2(psmouse, &info);
2008 if (error)
2009 goto init_fail;
2010
2011 return 0;
2012 init_fail:
2013 psmouse_reset(psmouse);
2014 return error;
2015}
2016
2017int elantech_init(struct psmouse *psmouse)
2018{
2019 struct elantech_device_info info;
2020 int error = -EINVAL;
2021
2022 psmouse_reset(psmouse);
2023
2024 error = elantech_query_info(psmouse, &info);
2025 if (error)
2026 goto init_fail;
2027
2028#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
2029
2030 if (elantech_use_host_notify(psmouse, &info)) {
2031 if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ||
2032 !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) {
2033 psmouse_warn(psmouse,
2034 "The touchpad can support a better bus than the too old PS/2 protocol. "
2035 "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n");
2036 }
2037 error = elantech_setup_smbus(psmouse, &info, true);
2038 if (!error)
2039 return PSMOUSE_ELANTECH_SMBUS;
2040 }
2041
2042#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
2043
2044 error = elantech_setup_ps2(psmouse, &info);
2045 if (error < 0) {
2046 /*
2047 * Not using any flavor of Elantech support, so clean up
2048 * SMbus breadcrumbs, if any.
2049 */
2050 psmouse_smbus_cleanup(psmouse);
2051 goto init_fail;
2052 }
2053
2054 return PSMOUSE_ELANTECH;
2055 init_fail:
2056 psmouse_reset(psmouse);
2057 return error;
2058}
2059