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[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / input / mouse / elantech.c
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/input.h>
18 #include <linux/input/mt.h>
19 #include <linux/serio.h>
20 #include <linux/libps2.h>
21 #include <asm/unaligned.h>
22 #include "psmouse.h"
23 #include "elantech.h"
24
25 #define elantech_debug(fmt, ...) \
26 do { \
27 if (etd->debug) \
28 psmouse_printk(KERN_DEBUG, psmouse, \
29 fmt, ##__VA_ARGS__); \
30 } while (0)
31
32 /*
33 * Send a Synaptics style sliced query command
34 */
35 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
36 unsigned char *param)
37 {
38 if (psmouse_sliced_command(psmouse, c) ||
39 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
40 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
41 return -1;
42 }
43
44 return 0;
45 }
46
47 /*
48 * V3 and later support this fast command
49 */
50 static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
51 unsigned char *param)
52 {
53 struct ps2dev *ps2dev = &psmouse->ps2dev;
54
55 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
56 ps2_command(ps2dev, NULL, c) ||
57 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
58 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
59 return -1;
60 }
61
62 return 0;
63 }
64
65 /*
66 * A retrying version of ps2_command
67 */
68 static int elantech_ps2_command(struct psmouse *psmouse,
69 unsigned char *param, int command)
70 {
71 struct ps2dev *ps2dev = &psmouse->ps2dev;
72 struct elantech_data *etd = psmouse->private;
73 int rc;
74 int tries = ETP_PS2_COMMAND_TRIES;
75
76 do {
77 rc = ps2_command(ps2dev, param, command);
78 if (rc == 0)
79 break;
80 tries--;
81 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
82 command, tries);
83 msleep(ETP_PS2_COMMAND_DELAY);
84 } while (tries > 0);
85
86 if (rc)
87 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
88
89 return rc;
90 }
91
92 /*
93 * Send an Elantech style special command to read a value from a register
94 */
95 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
96 unsigned char *val)
97 {
98 struct elantech_data *etd = psmouse->private;
99 unsigned char param[3];
100 int rc = 0;
101
102 if (reg < 0x07 || reg > 0x26)
103 return -1;
104
105 if (reg > 0x11 && reg < 0x20)
106 return -1;
107
108 switch (etd->hw_version) {
109 case 1:
110 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
111 psmouse_sliced_command(psmouse, reg) ||
112 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
113 rc = -1;
114 }
115 break;
116
117 case 2:
118 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
119 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
120 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
121 elantech_ps2_command(psmouse, NULL, reg) ||
122 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
123 rc = -1;
124 }
125 break;
126
127 case 3 ... 4:
128 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
129 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
130 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
131 elantech_ps2_command(psmouse, NULL, reg) ||
132 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
133 rc = -1;
134 }
135 break;
136 }
137
138 if (rc)
139 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
140 else if (etd->hw_version != 4)
141 *val = param[0];
142 else
143 *val = param[1];
144
145 return rc;
146 }
147
148 /*
149 * Send an Elantech style special command to write a register with a value
150 */
151 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
152 unsigned char val)
153 {
154 struct elantech_data *etd = psmouse->private;
155 int rc = 0;
156
157 if (reg < 0x07 || reg > 0x26)
158 return -1;
159
160 if (reg > 0x11 && reg < 0x20)
161 return -1;
162
163 switch (etd->hw_version) {
164 case 1:
165 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
166 psmouse_sliced_command(psmouse, reg) ||
167 psmouse_sliced_command(psmouse, val) ||
168 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
169 rc = -1;
170 }
171 break;
172
173 case 2:
174 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
175 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
176 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
177 elantech_ps2_command(psmouse, NULL, reg) ||
178 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
179 elantech_ps2_command(psmouse, NULL, val) ||
180 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
181 rc = -1;
182 }
183 break;
184
185 case 3:
186 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
187 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
188 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
189 elantech_ps2_command(psmouse, NULL, reg) ||
190 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
191 elantech_ps2_command(psmouse, NULL, val) ||
192 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
193 rc = -1;
194 }
195 break;
196
197 case 4:
198 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
199 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
200 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
201 elantech_ps2_command(psmouse, NULL, reg) ||
202 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
203 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
204 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
205 elantech_ps2_command(psmouse, NULL, val) ||
206 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
207 rc = -1;
208 }
209 break;
210 }
211
212 if (rc)
213 psmouse_err(psmouse,
214 "failed to write register 0x%02x with value 0x%02x.\n",
215 reg, val);
216
217 return rc;
218 }
219
220 /*
221 * Dump a complete mouse movement packet to the syslog
222 */
223 static void elantech_packet_dump(struct psmouse *psmouse)
224 {
225 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]\n",
226 psmouse->pktsize, psmouse->packet);
227 }
228
229 /*
230 * Interpret complete data packets and report absolute mode input events for
231 * hardware version 1. (4 byte packets)
232 */
233 static void elantech_report_absolute_v1(struct psmouse *psmouse)
234 {
235 struct input_dev *dev = psmouse->dev;
236 struct elantech_data *etd = psmouse->private;
237 unsigned char *packet = psmouse->packet;
238 int fingers;
239
240 if (etd->fw_version < 0x020000) {
241 /*
242 * byte 0: D U p1 p2 1 p3 R L
243 * byte 1: f 0 th tw x9 x8 y9 y8
244 */
245 fingers = ((packet[1] & 0x80) >> 7) +
246 ((packet[1] & 0x30) >> 4);
247 } else {
248 /*
249 * byte 0: n1 n0 p2 p1 1 p3 R L
250 * byte 1: 0 0 0 0 x9 x8 y9 y8
251 */
252 fingers = (packet[0] & 0xc0) >> 6;
253 }
254
255 if (etd->jumpy_cursor) {
256 if (fingers != 1) {
257 etd->single_finger_reports = 0;
258 } else if (etd->single_finger_reports < 2) {
259 /* Discard first 2 reports of one finger, bogus */
260 etd->single_finger_reports++;
261 elantech_debug("discarding packet\n");
262 return;
263 }
264 }
265
266 input_report_key(dev, BTN_TOUCH, fingers != 0);
267
268 /*
269 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
270 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
271 */
272 if (fingers) {
273 input_report_abs(dev, ABS_X,
274 ((packet[1] & 0x0c) << 6) | packet[2]);
275 input_report_abs(dev, ABS_Y,
276 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
277 }
278
279 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
280 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
281 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
282 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
283 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
284
285 if (etd->fw_version < 0x020000 &&
286 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
287 /* rocker up */
288 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
289 /* rocker down */
290 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
291 }
292
293 input_sync(dev);
294 }
295
296 static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
297 unsigned int x, unsigned int y)
298 {
299 input_mt_slot(dev, slot);
300 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
301 if (active) {
302 input_report_abs(dev, ABS_MT_POSITION_X, x);
303 input_report_abs(dev, ABS_MT_POSITION_Y, y);
304 }
305 }
306
307 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
308 static void elantech_report_semi_mt_data(struct input_dev *dev,
309 unsigned int num_fingers,
310 unsigned int x1, unsigned int y1,
311 unsigned int x2, unsigned int y2)
312 {
313 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
314 elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2);
315 }
316
317 /*
318 * Interpret complete data packets and report absolute mode input events for
319 * hardware version 2. (6 byte packets)
320 */
321 static void elantech_report_absolute_v2(struct psmouse *psmouse)
322 {
323 struct elantech_data *etd = psmouse->private;
324 struct input_dev *dev = psmouse->dev;
325 unsigned char *packet = psmouse->packet;
326 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
327 unsigned int width = 0, pres = 0;
328
329 /* byte 0: n1 n0 . . . . R L */
330 fingers = (packet[0] & 0xc0) >> 6;
331
332 switch (fingers) {
333 case 3:
334 /*
335 * Same as one finger, except report of more than 3 fingers:
336 * byte 3: n4 . w1 w0 . . . .
337 */
338 if (packet[3] & 0x80)
339 fingers = 4;
340 /* pass through... */
341 case 1:
342 /*
343 * byte 1: . . . . x11 x10 x9 x8
344 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
345 */
346 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
347 /*
348 * byte 4: . . . . y11 y10 y9 y8
349 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
350 */
351 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
352
353 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
354 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
355 break;
356
357 case 2:
358 /*
359 * The coordinate of each finger is reported separately
360 * with a lower resolution for two finger touches:
361 * byte 0: . . ay8 ax8 . . . .
362 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
363 */
364 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
365 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
366 y1 = etd->y_max -
367 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
368 /*
369 * byte 3: . . by8 bx8 . . . .
370 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
371 */
372 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
373 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
374 y2 = etd->y_max -
375 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
376
377 /* Unknown so just report sensible values */
378 pres = 127;
379 width = 7;
380 break;
381 }
382
383 input_report_key(dev, BTN_TOUCH, fingers != 0);
384 if (fingers != 0) {
385 input_report_abs(dev, ABS_X, x1);
386 input_report_abs(dev, ABS_Y, y1);
387 }
388 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
389 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
390 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
391 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
392 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
393 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
394 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
395 if (etd->reports_pressure) {
396 input_report_abs(dev, ABS_PRESSURE, pres);
397 input_report_abs(dev, ABS_TOOL_WIDTH, width);
398 }
399
400 input_sync(dev);
401 }
402
403 static void elantech_report_trackpoint(struct psmouse *psmouse,
404 int packet_type)
405 {
406 /*
407 * byte 0: 0 0 sx sy 0 M R L
408 * byte 1:~sx 0 0 0 0 0 0 0
409 * byte 2:~sy 0 0 0 0 0 0 0
410 * byte 3: 0 0 ~sy ~sx 0 1 1 0
411 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0
412 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
413 *
414 * x and y are written in two's complement spread
415 * over 9 bits with sx/sy the relative top bit and
416 * x7..x0 and y7..y0 the lower bits.
417 * The sign of y is opposite to what the input driver
418 * expects for a relative movement
419 */
420
421 struct elantech_data *etd = psmouse->private;
422 struct input_dev *tp_dev = etd->tp_dev;
423 unsigned char *packet = psmouse->packet;
424 int x, y;
425 u32 t;
426
427 t = get_unaligned_le32(&packet[0]);
428
429 switch (t & ~7U) {
430 case 0x06000030U:
431 case 0x16008020U:
432 case 0x26800010U:
433 case 0x36808000U:
434 x = packet[4] - (int)((packet[1]^0x80) << 1);
435 y = (int)((packet[2]^0x80) << 1) - packet[5];
436
437 input_report_key(tp_dev, BTN_LEFT, packet[0] & 0x01);
438 input_report_key(tp_dev, BTN_RIGHT, packet[0] & 0x02);
439 input_report_key(tp_dev, BTN_MIDDLE, packet[0] & 0x04);
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->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 */
461 static 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->fw_version & 0x001000) {
530 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
531 } else {
532 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
533 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
534 }
535
536 input_report_abs(dev, ABS_PRESSURE, pres);
537 input_report_abs(dev, ABS_TOOL_WIDTH, width);
538
539 input_sync(dev);
540 }
541
542 static void elantech_input_sync_v4(struct psmouse *psmouse)
543 {
544 struct input_dev *dev = psmouse->dev;
545 struct elantech_data *etd = psmouse->private;
546 unsigned char *packet = psmouse->packet;
547
548 /* For clickpads map both buttons to BTN_LEFT */
549 if (etd->fw_version & 0x001000) {
550 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
551 } else {
552 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
553 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
554 input_report_key(dev, BTN_MIDDLE, packet[0] & 0x04);
555 }
556
557 input_mt_report_pointer_emulation(dev, true);
558 input_sync(dev);
559 }
560
561 static void process_packet_status_v4(struct psmouse *psmouse)
562 {
563 struct input_dev *dev = psmouse->dev;
564 unsigned char *packet = psmouse->packet;
565 unsigned fingers;
566 int i;
567
568 /* notify finger state change */
569 fingers = packet[1] & 0x1f;
570 for (i = 0; i < ETP_MAX_FINGERS; i++) {
571 if ((fingers & (1 << i)) == 0) {
572 input_mt_slot(dev, i);
573 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
574 }
575 }
576
577 elantech_input_sync_v4(psmouse);
578 }
579
580 static void process_packet_head_v4(struct psmouse *psmouse)
581 {
582 struct input_dev *dev = psmouse->dev;
583 struct elantech_data *etd = psmouse->private;
584 unsigned char *packet = psmouse->packet;
585 int id = ((packet[3] & 0xe0) >> 5) - 1;
586 int pres, traces;
587
588 if (id < 0)
589 return;
590
591 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
592 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
593 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
594 traces = (packet[0] & 0xf0) >> 4;
595
596 input_mt_slot(dev, id);
597 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
598
599 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
600 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
601 input_report_abs(dev, ABS_MT_PRESSURE, pres);
602 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
603 /* report this for backwards compatibility */
604 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
605
606 elantech_input_sync_v4(psmouse);
607 }
608
609 static void process_packet_motion_v4(struct psmouse *psmouse)
610 {
611 struct input_dev *dev = psmouse->dev;
612 struct elantech_data *etd = psmouse->private;
613 unsigned char *packet = psmouse->packet;
614 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
615 int id, sid;
616
617 id = ((packet[0] & 0xe0) >> 5) - 1;
618 if (id < 0)
619 return;
620
621 sid = ((packet[3] & 0xe0) >> 5) - 1;
622 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
623 /*
624 * Motion packets give us the delta of x, y values of specific fingers,
625 * but in two's complement. Let the compiler do the conversion for us.
626 * Also _enlarge_ the numbers to int, in case of overflow.
627 */
628 delta_x1 = (signed char)packet[1];
629 delta_y1 = (signed char)packet[2];
630 delta_x2 = (signed char)packet[4];
631 delta_y2 = (signed char)packet[5];
632
633 etd->mt[id].x += delta_x1 * weight;
634 etd->mt[id].y -= delta_y1 * weight;
635 input_mt_slot(dev, id);
636 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
637 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
638
639 if (sid >= 0) {
640 etd->mt[sid].x += delta_x2 * weight;
641 etd->mt[sid].y -= delta_y2 * weight;
642 input_mt_slot(dev, sid);
643 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
644 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
645 }
646
647 elantech_input_sync_v4(psmouse);
648 }
649
650 static void elantech_report_absolute_v4(struct psmouse *psmouse,
651 int packet_type)
652 {
653 switch (packet_type) {
654 case PACKET_V4_STATUS:
655 process_packet_status_v4(psmouse);
656 break;
657
658 case PACKET_V4_HEAD:
659 process_packet_head_v4(psmouse);
660 break;
661
662 case PACKET_V4_MOTION:
663 process_packet_motion_v4(psmouse);
664 break;
665
666 case PACKET_UNKNOWN:
667 default:
668 /* impossible to get here */
669 break;
670 }
671 }
672
673 static int elantech_packet_check_v1(struct psmouse *psmouse)
674 {
675 struct elantech_data *etd = psmouse->private;
676 unsigned char *packet = psmouse->packet;
677 unsigned char p1, p2, p3;
678
679 /* Parity bits are placed differently */
680 if (etd->fw_version < 0x020000) {
681 /* byte 0: D U p1 p2 1 p3 R L */
682 p1 = (packet[0] & 0x20) >> 5;
683 p2 = (packet[0] & 0x10) >> 4;
684 } else {
685 /* byte 0: n1 n0 p2 p1 1 p3 R L */
686 p1 = (packet[0] & 0x10) >> 4;
687 p2 = (packet[0] & 0x20) >> 5;
688 }
689
690 p3 = (packet[0] & 0x04) >> 2;
691
692 return etd->parity[packet[1]] == p1 &&
693 etd->parity[packet[2]] == p2 &&
694 etd->parity[packet[3]] == p3;
695 }
696
697 static int elantech_debounce_check_v2(struct psmouse *psmouse)
698 {
699 /*
700 * When we encounter packet that matches this exactly, it means the
701 * hardware is in debounce status. Just ignore the whole packet.
702 */
703 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
704 unsigned char *packet = psmouse->packet;
705
706 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
707 }
708
709 static int elantech_packet_check_v2(struct psmouse *psmouse)
710 {
711 struct elantech_data *etd = psmouse->private;
712 unsigned char *packet = psmouse->packet;
713
714 /*
715 * V2 hardware has two flavors. Older ones that do not report pressure,
716 * and newer ones that reports pressure and width. With newer ones, all
717 * packets (1, 2, 3 finger touch) have the same constant bits. With
718 * older ones, 1/3 finger touch packets and 2 finger touch packets
719 * have different constant bits.
720 * With all three cases, if the constant bits are not exactly what I
721 * expected, I consider them invalid.
722 */
723 if (etd->reports_pressure)
724 return (packet[0] & 0x0c) == 0x04 &&
725 (packet[3] & 0x0f) == 0x02;
726
727 if ((packet[0] & 0xc0) == 0x80)
728 return (packet[0] & 0x0c) == 0x0c &&
729 (packet[3] & 0x0e) == 0x08;
730
731 return (packet[0] & 0x3c) == 0x3c &&
732 (packet[1] & 0xf0) == 0x00 &&
733 (packet[3] & 0x3e) == 0x38 &&
734 (packet[4] & 0xf0) == 0x00;
735 }
736
737 /*
738 * We check the constant bits to determine what packet type we get,
739 * so packet checking is mandatory for v3 and later hardware.
740 */
741 static int elantech_packet_check_v3(struct psmouse *psmouse)
742 {
743 struct elantech_data *etd = psmouse->private;
744 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
745 unsigned char *packet = psmouse->packet;
746
747 /*
748 * check debounce first, it has the same signature in byte 0
749 * and byte 3 as PACKET_V3_HEAD.
750 */
751 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
752 return PACKET_DEBOUNCE;
753
754 /*
755 * If the hardware flag 'crc_enabled' is set the packets have
756 * different signatures.
757 */
758 if (etd->crc_enabled) {
759 if ((packet[3] & 0x09) == 0x08)
760 return PACKET_V3_HEAD;
761
762 if ((packet[3] & 0x09) == 0x09)
763 return PACKET_V3_TAIL;
764 } else {
765 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
766 return PACKET_V3_HEAD;
767
768 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
769 return PACKET_V3_TAIL;
770 if ((packet[3] & 0x0f) == 0x06)
771 return PACKET_TRACKPOINT;
772 }
773
774 return PACKET_UNKNOWN;
775 }
776
777 static int elantech_packet_check_v4(struct psmouse *psmouse)
778 {
779 struct elantech_data *etd = psmouse->private;
780 unsigned char *packet = psmouse->packet;
781 unsigned char packet_type = packet[3] & 0x03;
782 unsigned int ic_version;
783 bool sanity_check;
784
785 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
786 return PACKET_TRACKPOINT;
787
788 /* This represents the version of IC body. */
789 ic_version = (etd->fw_version & 0x0f0000) >> 16;
790
791 /*
792 * Sanity check based on the constant bits of a packet.
793 * The constant bits change depending on the value of
794 * the hardware flag 'crc_enabled' and the version of
795 * the IC body, but are the same for every packet,
796 * regardless of the type.
797 */
798 if (etd->crc_enabled)
799 sanity_check = ((packet[3] & 0x08) == 0x00);
800 else if (ic_version == 7 && etd->samples[1] == 0x2A)
801 sanity_check = ((packet[3] & 0x1c) == 0x10);
802 else
803 sanity_check = ((packet[0] & 0x0c) == 0x04 &&
804 (packet[3] & 0x1c) == 0x10);
805
806 if (!sanity_check)
807 return PACKET_UNKNOWN;
808
809 switch (packet_type) {
810 case 0:
811 return PACKET_V4_STATUS;
812
813 case 1:
814 return PACKET_V4_HEAD;
815
816 case 2:
817 return PACKET_V4_MOTION;
818 }
819
820 return PACKET_UNKNOWN;
821 }
822
823 /*
824 * Process byte stream from mouse and handle complete packets
825 */
826 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
827 {
828 struct elantech_data *etd = psmouse->private;
829 int packet_type;
830
831 if (psmouse->pktcnt < psmouse->pktsize)
832 return PSMOUSE_GOOD_DATA;
833
834 if (etd->debug > 1)
835 elantech_packet_dump(psmouse);
836
837 switch (etd->hw_version) {
838 case 1:
839 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
840 return PSMOUSE_BAD_DATA;
841
842 elantech_report_absolute_v1(psmouse);
843 break;
844
845 case 2:
846 /* ignore debounce */
847 if (elantech_debounce_check_v2(psmouse))
848 return PSMOUSE_FULL_PACKET;
849
850 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
851 return PSMOUSE_BAD_DATA;
852
853 elantech_report_absolute_v2(psmouse);
854 break;
855
856 case 3:
857 packet_type = elantech_packet_check_v3(psmouse);
858 switch (packet_type) {
859 case PACKET_UNKNOWN:
860 return PSMOUSE_BAD_DATA;
861
862 case PACKET_DEBOUNCE:
863 /* ignore debounce */
864 break;
865
866 case PACKET_TRACKPOINT:
867 elantech_report_trackpoint(psmouse, packet_type);
868 break;
869
870 default:
871 elantech_report_absolute_v3(psmouse, packet_type);
872 break;
873 }
874
875 break;
876
877 case 4:
878 packet_type = elantech_packet_check_v4(psmouse);
879 switch (packet_type) {
880 case PACKET_UNKNOWN:
881 return PSMOUSE_BAD_DATA;
882
883 case PACKET_TRACKPOINT:
884 elantech_report_trackpoint(psmouse, packet_type);
885 break;
886
887 default:
888 elantech_report_absolute_v4(psmouse, packet_type);
889 break;
890 }
891
892 break;
893 }
894
895 return PSMOUSE_FULL_PACKET;
896 }
897
898 /*
899 * This writes the reg_07 value again to the hardware at the end of every
900 * set_rate call because the register loses its value. reg_07 allows setting
901 * absolute mode on v4 hardware
902 */
903 static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse,
904 unsigned int rate)
905 {
906 struct elantech_data *etd = psmouse->private;
907
908 etd->original_set_rate(psmouse, rate);
909 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
910 psmouse_err(psmouse, "restoring reg_07 failed\n");
911 }
912
913 /*
914 * Put the touchpad into absolute mode
915 */
916 static int elantech_set_absolute_mode(struct psmouse *psmouse)
917 {
918 struct elantech_data *etd = psmouse->private;
919 unsigned char val;
920 int tries = ETP_READ_BACK_TRIES;
921 int rc = 0;
922
923 switch (etd->hw_version) {
924 case 1:
925 etd->reg_10 = 0x16;
926 etd->reg_11 = 0x8f;
927 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
928 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
929 rc = -1;
930 }
931 break;
932
933 case 2:
934 /* Windows driver values */
935 etd->reg_10 = 0x54;
936 etd->reg_11 = 0x88; /* 0x8a */
937 etd->reg_21 = 0x60; /* 0x00 */
938 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
939 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
940 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
941 rc = -1;
942 }
943 break;
944
945 case 3:
946 if (etd->set_hw_resolution)
947 etd->reg_10 = 0x0b;
948 else
949 etd->reg_10 = 0x01;
950
951 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
952 rc = -1;
953
954 break;
955
956 case 4:
957 etd->reg_07 = 0x01;
958 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
959 rc = -1;
960
961 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
962 }
963
964 if (rc == 0) {
965 /*
966 * Read back reg 0x10. For hardware version 1 we must make
967 * sure the absolute mode bit is set. For hardware version 2
968 * the touchpad is probably initializing and not ready until
969 * we read back the value we just wrote.
970 */
971 do {
972 rc = elantech_read_reg(psmouse, 0x10, &val);
973 if (rc == 0)
974 break;
975 tries--;
976 elantech_debug("retrying read (%d).\n", tries);
977 msleep(ETP_READ_BACK_DELAY);
978 } while (tries > 0);
979
980 if (rc) {
981 psmouse_err(psmouse,
982 "failed to read back register 0x10.\n");
983 } else if (etd->hw_version == 1 &&
984 !(val & ETP_R10_ABSOLUTE_MODE)) {
985 psmouse_err(psmouse,
986 "touchpad refuses to switch to absolute mode.\n");
987 rc = -1;
988 }
989 }
990
991 skip_readback_reg_10:
992 if (rc)
993 psmouse_err(psmouse, "failed to initialise registers.\n");
994
995 return rc;
996 }
997
998 static int elantech_set_range(struct psmouse *psmouse,
999 unsigned int *x_min, unsigned int *y_min,
1000 unsigned int *x_max, unsigned int *y_max,
1001 unsigned int *width)
1002 {
1003 struct elantech_data *etd = psmouse->private;
1004 unsigned char param[3];
1005 unsigned char traces;
1006
1007 switch (etd->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 (etd->fw_version == 0x020800 ||
1017 etd->fw_version == 0x020b00 ||
1018 etd->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 = (etd->fw_version > 0x020800 &&
1028 etd->fw_version < 0x020900) ? 1 : 2;
1029
1030 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1031 return -1;
1032
1033 fixed_dpi = param[1] & 0x10;
1034
1035 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
1036 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
1037 return -1;
1038
1039 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
1040 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
1041 } else if (etd->fw_version == 0x040216) {
1042 *x_max = 819;
1043 *y_max = 405;
1044 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
1045 *x_max = 900;
1046 *y_max = 500;
1047 } else {
1048 *x_max = (etd->capabilities[1] - i) * 64;
1049 *y_max = (etd->capabilities[2] - i) * 64;
1050 }
1051 }
1052 break;
1053
1054 case 3:
1055 if (etd->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 (etd->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 = etd->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 */
1083 static unsigned int elantech_convert_res(unsigned int val)
1084 {
1085 return (val * 10 + 790) * 10 / 254;
1086 }
1087
1088 static int elantech_get_resolution_v4(struct psmouse *psmouse,
1089 unsigned int *x_res,
1090 unsigned int *y_res)
1091 {
1092 unsigned char param[3];
1093
1094 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
1095 return -1;
1096
1097 *x_res = elantech_convert_res(param[1] & 0x0f);
1098 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
1099
1100 return 0;
1101 }
1102
1103 /*
1104 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
1105 * fw_version for this is based on the following fw_version & caps table:
1106 *
1107 * Laptop-model: fw_version: caps: buttons:
1108 * Acer S3 0x461f00 10, 13, 0e clickpad
1109 * Acer S7-392 0x581f01 50, 17, 0d clickpad
1110 * Acer V5-131 0x461f02 01, 16, 0c clickpad
1111 * Acer V5-551 0x461f00 ? clickpad
1112 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons
1113 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons
1114 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons
1115 * Asus TP500LN 0x381f17 10, 14, 0e clickpad
1116 * Asus X750JN 0x381f17 10, 14, 0e clickpad
1117 * Asus UX31 0x361f00 20, 15, 0e clickpad
1118 * Asus UX32VD 0x361f02 00, 15, 0e clickpad
1119 * Avatar AVIU-145A2 0x361f00 ? clickpad
1120 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons
1121 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons
1122 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons
1123 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons
1124 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons
1125 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons
1126 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**)
1127 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons
1128 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*)
1129 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*)
1130 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons
1131 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad
1132 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad
1133 * Samsung NP900X3E-A02 0x575f03 ? clickpad
1134 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad
1135 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons
1136 * Samsung RF710 0x450f00 ? 2 hw buttons
1137 * System76 Pangolin 0x250f01 ? 2 hw buttons
1138 * (*) + 3 trackpoint buttons
1139 * (**) + 0 trackpoint buttons
1140 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps
1141 */
1142 static void elantech_set_buttonpad_prop(struct psmouse *psmouse)
1143 {
1144 struct input_dev *dev = psmouse->dev;
1145 struct elantech_data *etd = psmouse->private;
1146
1147 if (etd->fw_version & 0x001000) {
1148 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1149 __clear_bit(BTN_RIGHT, dev->keybit);
1150 }
1151 }
1152
1153 /*
1154 * Some hw_version 4 models do have a middle button
1155 */
1156 static const struct dmi_system_id elantech_dmi_has_middle_button[] = {
1157 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1158 {
1159 /* Fujitsu H730 has a middle button */
1160 .matches = {
1161 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1162 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1163 },
1164 },
1165 {
1166 /* Fujitsu H760 also has a middle button */
1167 .matches = {
1168 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1169 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1170 },
1171 },
1172 #endif
1173 { }
1174 };
1175
1176 /*
1177 * Set the appropriate event bits for the input subsystem
1178 */
1179 static int elantech_set_input_params(struct psmouse *psmouse)
1180 {
1181 struct input_dev *dev = psmouse->dev;
1182 struct elantech_data *etd = psmouse->private;
1183 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
1184 unsigned int x_res = 31, y_res = 31;
1185
1186 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
1187 return -1;
1188
1189 __set_bit(INPUT_PROP_POINTER, dev->propbit);
1190 __set_bit(EV_KEY, dev->evbit);
1191 __set_bit(EV_ABS, dev->evbit);
1192 __clear_bit(EV_REL, dev->evbit);
1193
1194 __set_bit(BTN_LEFT, dev->keybit);
1195 if (dmi_check_system(elantech_dmi_has_middle_button))
1196 __set_bit(BTN_MIDDLE, dev->keybit);
1197 __set_bit(BTN_RIGHT, dev->keybit);
1198
1199 __set_bit(BTN_TOUCH, dev->keybit);
1200 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1201 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1202 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1203
1204 switch (etd->hw_version) {
1205 case 1:
1206 /* Rocker button */
1207 if (etd->fw_version < 0x020000 &&
1208 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
1209 __set_bit(BTN_FORWARD, dev->keybit);
1210 __set_bit(BTN_BACK, dev->keybit);
1211 }
1212 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1213 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1214 break;
1215
1216 case 2:
1217 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1218 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1219 /* fall through */
1220 case 3:
1221 if (etd->hw_version == 3)
1222 elantech_set_buttonpad_prop(psmouse);
1223 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1224 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1225 if (etd->reports_pressure) {
1226 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1227 ETP_PMAX_V2, 0, 0);
1228 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1229 ETP_WMAX_V2, 0, 0);
1230 }
1231 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT);
1232 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1233 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1234 break;
1235
1236 case 4:
1237 if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
1238 /*
1239 * if query failed, print a warning and leave the values
1240 * zero to resemble synaptics.c behavior.
1241 */
1242 psmouse_warn(psmouse, "couldn't query resolution data.\n");
1243 }
1244 elantech_set_buttonpad_prop(psmouse);
1245 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1246 /* For X to recognize me as touchpad. */
1247 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1248 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1249 /*
1250 * range of pressure and width is the same as v2,
1251 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1252 */
1253 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1254 ETP_PMAX_V2, 0, 0);
1255 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1256 ETP_WMAX_V2, 0, 0);
1257 /* Multitouch capable pad, up to 5 fingers. */
1258 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1259 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1260 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1261 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1262 ETP_PMAX_V2, 0, 0);
1263 /*
1264 * The firmware reports how many trace lines the finger spans,
1265 * convert to surface unit as Protocol-B requires.
1266 */
1267 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1268 ETP_WMAX_V2 * width, 0, 0);
1269 break;
1270 }
1271
1272 input_abs_set_res(dev, ABS_X, x_res);
1273 input_abs_set_res(dev, ABS_Y, y_res);
1274 if (etd->hw_version > 1) {
1275 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
1276 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
1277 }
1278
1279 etd->y_max = y_max;
1280 etd->width = width;
1281
1282 return 0;
1283 }
1284
1285 struct elantech_attr_data {
1286 size_t field_offset;
1287 unsigned char reg;
1288 };
1289
1290 /*
1291 * Display a register value by reading a sysfs entry
1292 */
1293 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1294 char *buf)
1295 {
1296 struct elantech_data *etd = psmouse->private;
1297 struct elantech_attr_data *attr = data;
1298 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1299 int rc = 0;
1300
1301 if (attr->reg)
1302 rc = elantech_read_reg(psmouse, attr->reg, reg);
1303
1304 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1305 }
1306
1307 /*
1308 * Write a register value by writing a sysfs entry
1309 */
1310 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1311 void *data, const char *buf, size_t count)
1312 {
1313 struct elantech_data *etd = psmouse->private;
1314 struct elantech_attr_data *attr = data;
1315 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1316 unsigned char value;
1317 int err;
1318
1319 err = kstrtou8(buf, 16, &value);
1320 if (err)
1321 return err;
1322
1323 /* Do we need to preserve some bits for version 2 hardware too? */
1324 if (etd->hw_version == 1) {
1325 if (attr->reg == 0x10)
1326 /* Force absolute mode always on */
1327 value |= ETP_R10_ABSOLUTE_MODE;
1328 else if (attr->reg == 0x11)
1329 /* Force 4 byte mode always on */
1330 value |= ETP_R11_4_BYTE_MODE;
1331 }
1332
1333 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1334 *reg = value;
1335
1336 return count;
1337 }
1338
1339 #define ELANTECH_INT_ATTR(_name, _register) \
1340 static struct elantech_attr_data elantech_attr_##_name = { \
1341 .field_offset = offsetof(struct elantech_data, _name), \
1342 .reg = _register, \
1343 }; \
1344 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1345 &elantech_attr_##_name, \
1346 elantech_show_int_attr, \
1347 elantech_set_int_attr)
1348
1349 ELANTECH_INT_ATTR(reg_07, 0x07);
1350 ELANTECH_INT_ATTR(reg_10, 0x10);
1351 ELANTECH_INT_ATTR(reg_11, 0x11);
1352 ELANTECH_INT_ATTR(reg_20, 0x20);
1353 ELANTECH_INT_ATTR(reg_21, 0x21);
1354 ELANTECH_INT_ATTR(reg_22, 0x22);
1355 ELANTECH_INT_ATTR(reg_23, 0x23);
1356 ELANTECH_INT_ATTR(reg_24, 0x24);
1357 ELANTECH_INT_ATTR(reg_25, 0x25);
1358 ELANTECH_INT_ATTR(reg_26, 0x26);
1359 ELANTECH_INT_ATTR(debug, 0);
1360 ELANTECH_INT_ATTR(paritycheck, 0);
1361 ELANTECH_INT_ATTR(crc_enabled, 0);
1362
1363 static struct attribute *elantech_attrs[] = {
1364 &psmouse_attr_reg_07.dattr.attr,
1365 &psmouse_attr_reg_10.dattr.attr,
1366 &psmouse_attr_reg_11.dattr.attr,
1367 &psmouse_attr_reg_20.dattr.attr,
1368 &psmouse_attr_reg_21.dattr.attr,
1369 &psmouse_attr_reg_22.dattr.attr,
1370 &psmouse_attr_reg_23.dattr.attr,
1371 &psmouse_attr_reg_24.dattr.attr,
1372 &psmouse_attr_reg_25.dattr.attr,
1373 &psmouse_attr_reg_26.dattr.attr,
1374 &psmouse_attr_debug.dattr.attr,
1375 &psmouse_attr_paritycheck.dattr.attr,
1376 &psmouse_attr_crc_enabled.dattr.attr,
1377 NULL
1378 };
1379
1380 static struct attribute_group elantech_attr_group = {
1381 .attrs = elantech_attrs,
1382 };
1383
1384 static bool elantech_is_signature_valid(const unsigned char *param)
1385 {
1386 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1387 int i;
1388
1389 if (param[0] == 0)
1390 return false;
1391
1392 if (param[1] == 0)
1393 return true;
1394
1395 /*
1396 * Some hw_version >= 4 models have a revision higher then 20. Meaning
1397 * that param[2] may be 10 or 20, skip the rates check for these.
1398 */
1399 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f &&
1400 param[2] < 40)
1401 return true;
1402
1403 for (i = 0; i < ARRAY_SIZE(rates); i++)
1404 if (param[2] == rates[i])
1405 return false;
1406
1407 return true;
1408 }
1409
1410 /*
1411 * Use magic knock to detect Elantech touchpad
1412 */
1413 int elantech_detect(struct psmouse *psmouse, bool set_properties)
1414 {
1415 struct ps2dev *ps2dev = &psmouse->ps2dev;
1416 unsigned char param[3];
1417
1418 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1419
1420 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1421 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1422 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1423 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1424 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1425 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1426 return -1;
1427 }
1428
1429 /*
1430 * Report this in case there are Elantech models that use a different
1431 * set of magic numbers
1432 */
1433 if (param[0] != 0x3c || param[1] != 0x03 ||
1434 (param[2] != 0xc8 && param[2] != 0x00)) {
1435 psmouse_dbg(psmouse,
1436 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1437 param[0], param[1], param[2]);
1438 return -1;
1439 }
1440
1441 /*
1442 * Query touchpad's firmware version and see if it reports known
1443 * value to avoid mis-detection. Logitech mice are known to respond
1444 * to Elantech magic knock and there might be more.
1445 */
1446 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1447 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1448 return -1;
1449 }
1450
1451 psmouse_dbg(psmouse,
1452 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1453 param[0], param[1], param[2]);
1454
1455 if (!elantech_is_signature_valid(param)) {
1456 psmouse_dbg(psmouse,
1457 "Probably not a real Elantech touchpad. Aborting.\n");
1458 return -1;
1459 }
1460
1461 if (set_properties) {
1462 psmouse->vendor = "Elantech";
1463 psmouse->name = "Touchpad";
1464 }
1465
1466 return 0;
1467 }
1468
1469 /*
1470 * Clean up sysfs entries when disconnecting
1471 */
1472 static void elantech_disconnect(struct psmouse *psmouse)
1473 {
1474 struct elantech_data *etd = psmouse->private;
1475
1476 if (etd->tp_dev)
1477 input_unregister_device(etd->tp_dev);
1478 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1479 &elantech_attr_group);
1480 kfree(psmouse->private);
1481 psmouse->private = NULL;
1482 }
1483
1484 /*
1485 * Put the touchpad back into absolute mode when reconnecting
1486 */
1487 static int elantech_reconnect(struct psmouse *psmouse)
1488 {
1489 psmouse_reset(psmouse);
1490
1491 if (elantech_detect(psmouse, 0))
1492 return -1;
1493
1494 if (elantech_set_absolute_mode(psmouse)) {
1495 psmouse_err(psmouse,
1496 "failed to put touchpad back into absolute mode.\n");
1497 return -1;
1498 }
1499
1500 return 0;
1501 }
1502
1503 /*
1504 * Some hw_version 4 models do not work with crc_disabled
1505 */
1506 static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
1507 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1508 {
1509 /* Fujitsu H730 does not work with crc_enabled == 0 */
1510 .matches = {
1511 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1512 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1513 },
1514 },
1515 {
1516 /* Fujitsu H760 does not work with crc_enabled == 0 */
1517 .matches = {
1518 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1519 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1520 },
1521 },
1522 {
1523 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */
1524 .matches = {
1525 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1526 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
1527 },
1528 },
1529 {
1530 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */
1531 .matches = {
1532 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1533 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"),
1534 },
1535 },
1536 {
1537 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */
1538 .matches = {
1539 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1540 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"),
1541 },
1542 },
1543 {
1544 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */
1545 .matches = {
1546 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1547 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"),
1548 },
1549 },
1550 {
1551 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */
1552 .matches = {
1553 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1554 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"),
1555 },
1556 },
1557 {
1558 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */
1559 .matches = {
1560 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1561 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"),
1562 },
1563 },
1564 {
1565 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
1566 .matches = {
1567 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1568 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
1569 },
1570 },
1571 #endif
1572 { }
1573 };
1574
1575 /*
1576 * Some hw_version 3 models go into error state when we try to set
1577 * bit 3 and/or bit 1 of r10.
1578 */
1579 static const struct dmi_system_id no_hw_res_dmi_table[] = {
1580 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1581 {
1582 /* Gigabyte U2442 */
1583 .matches = {
1584 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1585 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1586 },
1587 },
1588 #endif
1589 { }
1590 };
1591
1592 /*
1593 * determine hardware version and set some properties according to it.
1594 */
1595 static int elantech_set_properties(struct elantech_data *etd)
1596 {
1597 /* This represents the version of IC body. */
1598 int ver = (etd->fw_version & 0x0f0000) >> 16;
1599
1600 /* Early version of Elan touchpads doesn't obey the rule. */
1601 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1602 etd->hw_version = 1;
1603 else {
1604 switch (ver) {
1605 case 2:
1606 case 4:
1607 etd->hw_version = 2;
1608 break;
1609 case 5:
1610 etd->hw_version = 3;
1611 break;
1612 case 6 ... 14:
1613 etd->hw_version = 4;
1614 break;
1615 default:
1616 return -1;
1617 }
1618 }
1619
1620 /* decide which send_cmd we're gonna use early */
1621 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
1622 synaptics_send_cmd;
1623
1624 /* Turn on packet checking by default */
1625 etd->paritycheck = 1;
1626
1627 /*
1628 * This firmware suffers from misreporting coordinates when
1629 * a touch action starts causing the mouse cursor or scrolled page
1630 * to jump. Enable a workaround.
1631 */
1632 etd->jumpy_cursor =
1633 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1634
1635 if (etd->hw_version > 1) {
1636 /* For now show extra debug information */
1637 etd->debug = 1;
1638
1639 if (etd->fw_version >= 0x020800)
1640 etd->reports_pressure = true;
1641 }
1642
1643 /*
1644 * The signatures of v3 and v4 packets change depending on the
1645 * value of this hardware flag.
1646 */
1647 etd->crc_enabled = (etd->fw_version & 0x4000) == 0x4000 ||
1648 dmi_check_system(elantech_dmi_force_crc_enabled);
1649
1650 /* Enable real hardware resolution on hw_version 3 ? */
1651 etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1652
1653 return 0;
1654 }
1655
1656 /*
1657 * Initialize the touchpad and create sysfs entries
1658 */
1659 int elantech_init(struct psmouse *psmouse)
1660 {
1661 struct elantech_data *etd;
1662 int i;
1663 int error = -EINVAL;
1664 unsigned char param[3];
1665 struct input_dev *tp_dev;
1666
1667 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
1668 if (!etd)
1669 return -ENOMEM;
1670
1671 psmouse_reset(psmouse);
1672
1673 etd->parity[0] = 1;
1674 for (i = 1; i < 256; i++)
1675 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1676
1677 /*
1678 * Do the version query again so we can store the result
1679 */
1680 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1681 psmouse_err(psmouse, "failed to query firmware version.\n");
1682 goto init_fail;
1683 }
1684 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1685
1686 if (elantech_set_properties(etd)) {
1687 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1688 goto init_fail;
1689 }
1690 psmouse_info(psmouse,
1691 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1692 etd->hw_version, param[0], param[1], param[2]);
1693
1694 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1695 etd->capabilities)) {
1696 psmouse_err(psmouse, "failed to query capabilities.\n");
1697 goto init_fail;
1698 }
1699 psmouse_info(psmouse,
1700 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1701 etd->capabilities[0], etd->capabilities[1],
1702 etd->capabilities[2]);
1703
1704 if (etd->hw_version != 1) {
1705 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, etd->samples)) {
1706 psmouse_err(psmouse, "failed to query sample data\n");
1707 goto init_fail;
1708 }
1709 psmouse_info(psmouse,
1710 "Elan sample query result %02x, %02x, %02x\n",
1711 etd->samples[0], etd->samples[1], etd->samples[2]);
1712 }
1713
1714 if (etd->samples[1] == 0x74 && etd->hw_version == 0x03) {
1715 /*
1716 * This module has a bug which makes absolute mode
1717 * unusable, so let's abort so we'll be using standard
1718 * PS/2 protocol.
1719 */
1720 psmouse_info(psmouse,
1721 "absolute mode broken, forcing standard PS/2 protocol\n");
1722 goto init_fail;
1723 }
1724
1725 if (elantech_set_absolute_mode(psmouse)) {
1726 psmouse_err(psmouse,
1727 "failed to put touchpad into absolute mode.\n");
1728 goto init_fail;
1729 }
1730
1731 if (etd->fw_version == 0x381f17) {
1732 etd->original_set_rate = psmouse->set_rate;
1733 psmouse->set_rate = elantech_set_rate_restore_reg_07;
1734 }
1735
1736 if (elantech_set_input_params(psmouse)) {
1737 psmouse_err(psmouse, "failed to query touchpad range.\n");
1738 goto init_fail;
1739 }
1740
1741 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1742 &elantech_attr_group);
1743 if (error) {
1744 psmouse_err(psmouse,
1745 "failed to create sysfs attributes, error: %d.\n",
1746 error);
1747 goto init_fail;
1748 }
1749
1750 /* The MSB indicates the presence of the trackpoint */
1751 if ((etd->capabilities[0] & 0x80) == 0x80) {
1752 tp_dev = input_allocate_device();
1753
1754 if (!tp_dev) {
1755 error = -ENOMEM;
1756 goto init_fail_tp_alloc;
1757 }
1758
1759 etd->tp_dev = tp_dev;
1760 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
1761 psmouse->ps2dev.serio->phys);
1762 tp_dev->phys = etd->tp_phys;
1763 tp_dev->name = "ETPS/2 Elantech TrackPoint";
1764 tp_dev->id.bustype = BUS_I8042;
1765 tp_dev->id.vendor = 0x0002;
1766 tp_dev->id.product = PSMOUSE_ELANTECH;
1767 tp_dev->id.version = 0x0000;
1768 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1769 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
1770 tp_dev->relbit[BIT_WORD(REL_X)] =
1771 BIT_MASK(REL_X) | BIT_MASK(REL_Y);
1772 tp_dev->keybit[BIT_WORD(BTN_LEFT)] =
1773 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
1774 BIT_MASK(BTN_RIGHT);
1775
1776 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit);
1777 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit);
1778
1779 error = input_register_device(etd->tp_dev);
1780 if (error < 0)
1781 goto init_fail_tp_reg;
1782 }
1783
1784 psmouse->protocol_handler = elantech_process_byte;
1785 psmouse->disconnect = elantech_disconnect;
1786 psmouse->reconnect = elantech_reconnect;
1787 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
1788
1789 return 0;
1790 init_fail_tp_reg:
1791 input_free_device(tp_dev);
1792 init_fail_tp_alloc:
1793 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1794 &elantech_attr_group);
1795 init_fail:
1796 psmouse_reset(psmouse);
1797 kfree(etd);
1798 return error;
1799 }