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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#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
14
15#include <linux/delay.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/input.h>
19#include <linux/input/mt.h>
20#include <linux/serio.h>
21#include <linux/libps2.h>
22#include "psmouse.h"
23#include "elantech.h"
24
25#define elantech_debug(fmt, ...) \
26 do { \
27 if (etd->debug) \
28 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
29 } while (0)
30
31static bool force_elantech;
32module_param_named(force_elantech, force_elantech, bool, 0644);
33MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default).");
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 (psmouse_sliced_command(psmouse, c) ||
42 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
43 pr_err("synaptics_send_cmd query 0x%02x failed.\n", c);
44 return -1;
45 }
46
47 return 0;
48}
49
50/*
51 * A retrying version of ps2_command
52 */
53static int elantech_ps2_command(struct psmouse *psmouse,
54 unsigned char *param, int command)
55{
56 struct ps2dev *ps2dev = &psmouse->ps2dev;
57 struct elantech_data *etd = psmouse->private;
58 int rc;
59 int tries = ETP_PS2_COMMAND_TRIES;
60
61 do {
62 rc = ps2_command(ps2dev, param, command);
63 if (rc == 0)
64 break;
65 tries--;
66 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
67 command, tries);
68 msleep(ETP_PS2_COMMAND_DELAY);
69 } while (tries > 0);
70
71 if (rc)
72 pr_err("ps2 command 0x%02x failed.\n", command);
73
74 return rc;
75}
76
77/*
78 * Send an Elantech style special command to read a value from a register
79 */
80static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
81 unsigned char *val)
82{
83 struct elantech_data *etd = psmouse->private;
84 unsigned char param[3];
85 int rc = 0;
86
87 if (reg < 0x10 || reg > 0x26)
88 return -1;
89
90 if (reg > 0x11 && reg < 0x20)
91 return -1;
92
93 switch (etd->hw_version) {
94 case 1:
95 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
96 psmouse_sliced_command(psmouse, reg) ||
97 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
98 rc = -1;
99 }
100 break;
101
102 case 2:
103 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
104 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
105 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
106 elantech_ps2_command(psmouse, NULL, reg) ||
107 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
108 rc = -1;
109 }
110 break;
111 }
112
113 if (rc)
114 pr_err("failed to read register 0x%02x.\n", reg);
115 else
116 *val = param[0];
117
118 return rc;
119}
120
121/*
122 * Send an Elantech style special command to write a register with a value
123 */
124static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
125 unsigned char val)
126{
127 struct elantech_data *etd = psmouse->private;
128 int rc = 0;
129
130 if (reg < 0x10 || reg > 0x26)
131 return -1;
132
133 if (reg > 0x11 && reg < 0x20)
134 return -1;
135
136 switch (etd->hw_version) {
137 case 1:
138 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
139 psmouse_sliced_command(psmouse, reg) ||
140 psmouse_sliced_command(psmouse, val) ||
141 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
142 rc = -1;
143 }
144 break;
145
146 case 2:
147 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
148 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
149 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
150 elantech_ps2_command(psmouse, NULL, reg) ||
151 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
152 elantech_ps2_command(psmouse, NULL, val) ||
153 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
154 rc = -1;
155 }
156 break;
157 }
158
159 if (rc)
160 pr_err("failed to write register 0x%02x with value 0x%02x.\n",
161 reg, val);
162
163 return rc;
164}
165
166/*
167 * Dump a complete mouse movement packet to the syslog
168 */
169static void elantech_packet_dump(unsigned char *packet, int size)
170{
171 int i;
172
173 printk(KERN_DEBUG pr_fmt("PS/2 packet ["));
174 for (i = 0; i < size; i++)
175 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
176 printk("]\n");
177}
178
179/*
180 * Interpret complete data packets and report absolute mode input events for
181 * hardware version 1. (4 byte packets)
182 */
183static void elantech_report_absolute_v1(struct psmouse *psmouse)
184{
185 struct input_dev *dev = psmouse->dev;
186 struct elantech_data *etd = psmouse->private;
187 unsigned char *packet = psmouse->packet;
188 int fingers;
189
190 if (etd->fw_version < 0x020000) {
191 /*
192 * byte 0: D U p1 p2 1 p3 R L
193 * byte 1: f 0 th tw x9 x8 y9 y8
194 */
195 fingers = ((packet[1] & 0x80) >> 7) +
196 ((packet[1] & 0x30) >> 4);
197 } else {
198 /*
199 * byte 0: n1 n0 p2 p1 1 p3 R L
200 * byte 1: 0 0 0 0 x9 x8 y9 y8
201 */
202 fingers = (packet[0] & 0xc0) >> 6;
203 }
204
205 if (etd->jumpy_cursor) {
206 if (fingers != 1) {
207 etd->single_finger_reports = 0;
208 } else if (etd->single_finger_reports < 2) {
209 /* Discard first 2 reports of one finger, bogus */
210 etd->single_finger_reports++;
211 elantech_debug("discarding packet\n");
212 return;
213 }
214 }
215
216 input_report_key(dev, BTN_TOUCH, fingers != 0);
217
218 /*
219 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
220 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
221 */
222 if (fingers) {
223 input_report_abs(dev, ABS_X,
224 ((packet[1] & 0x0c) << 6) | packet[2]);
225 input_report_abs(dev, ABS_Y,
226 ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3]));
227 }
228
229 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
230 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
231 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
232 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
233 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
234
235 if (etd->fw_version < 0x020000 &&
236 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
237 /* rocker up */
238 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
239 /* rocker down */
240 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
241 }
242
243 input_sync(dev);
244}
245
246static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
247 unsigned int x, unsigned int y)
248{
249 input_mt_slot(dev, slot);
250 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
251 if (active) {
252 input_report_abs(dev, ABS_MT_POSITION_X, x);
253 input_report_abs(dev, ABS_MT_POSITION_Y, y);
254 }
255}
256
257/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
258static void elantech_report_semi_mt_data(struct input_dev *dev,
259 unsigned int num_fingers,
260 unsigned int x1, unsigned int y1,
261 unsigned int x2, unsigned int y2)
262{
263 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
264 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
265}
266
267/*
268 * Interpret complete data packets and report absolute mode input events for
269 * hardware version 2. (6 byte packets)
270 */
271static void elantech_report_absolute_v2(struct psmouse *psmouse)
272{
273 struct elantech_data *etd = psmouse->private;
274 struct input_dev *dev = psmouse->dev;
275 unsigned char *packet = psmouse->packet;
276 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0, width = 0, pres = 0;
277
278 /* byte 0: n1 n0 . . . . R L */
279 fingers = (packet[0] & 0xc0) >> 6;
280 input_report_key(dev, BTN_TOUCH, fingers != 0);
281
282 switch (fingers) {
283 case 3:
284 /*
285 * Same as one finger, except report of more than 3 fingers:
286 * byte 3: n4 . w1 w0 . . . .
287 */
288 if (packet[3] & 0x80)
289 fingers = 4;
290 /* pass through... */
291 case 1:
292 /*
293 * byte 1: . . . . . x10 x9 x8
294 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
295 */
296 x1 = ((packet[1] & 0x07) << 8) | packet[2];
297 /*
298 * byte 4: . . . . . . y9 y8
299 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
300 */
301 y1 = ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5]);
302
303 input_report_abs(dev, ABS_X, x1);
304 input_report_abs(dev, ABS_Y, y1);
305
306 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
307 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
308 break;
309
310 case 2:
311 /*
312 * The coordinate of each finger is reported separately
313 * with a lower resolution for two finger touches:
314 * byte 0: . . ay8 ax8 . . . .
315 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
316 */
317 x1 = ((packet[0] & 0x10) << 4) | packet[1];
318 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
319 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
320 /*
321 * byte 3: . . by8 bx8 . . . .
322 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
323 */
324 x2 = ((packet[3] & 0x10) << 4) | packet[4];
325 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
326 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
327 /*
328 * For compatibility with the X Synaptics driver scale up
329 * one coordinate and report as ordinary mouse movent
330 */
331 input_report_abs(dev, ABS_X, x1 << 2);
332 input_report_abs(dev, ABS_Y, y1 << 2);
333
334 /* Unknown so just report sensible values */
335 pres = 127;
336 width = 7;
337 break;
338 }
339
340 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
341 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
342 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
343 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
344 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
345 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
346 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
347 if (etd->reports_pressure) {
348 input_report_abs(dev, ABS_PRESSURE, pres);
349 input_report_abs(dev, ABS_TOOL_WIDTH, width);
350 }
351
352 input_sync(dev);
353}
354
355static int elantech_check_parity_v1(struct psmouse *psmouse)
356{
357 struct elantech_data *etd = psmouse->private;
358 unsigned char *packet = psmouse->packet;
359 unsigned char p1, p2, p3;
360
361 /* Parity bits are placed differently */
362 if (etd->fw_version < 0x020000) {
363 /* byte 0: D U p1 p2 1 p3 R L */
364 p1 = (packet[0] & 0x20) >> 5;
365 p2 = (packet[0] & 0x10) >> 4;
366 } else {
367 /* byte 0: n1 n0 p2 p1 1 p3 R L */
368 p1 = (packet[0] & 0x10) >> 4;
369 p2 = (packet[0] & 0x20) >> 5;
370 }
371
372 p3 = (packet[0] & 0x04) >> 2;
373
374 return etd->parity[packet[1]] == p1 &&
375 etd->parity[packet[2]] == p2 &&
376 etd->parity[packet[3]] == p3;
377}
378
379/*
380 * Process byte stream from mouse and handle complete packets
381 */
382static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
383{
384 struct elantech_data *etd = psmouse->private;
385
386 if (psmouse->pktcnt < psmouse->pktsize)
387 return PSMOUSE_GOOD_DATA;
388
389 if (etd->debug > 1)
390 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
391
392 switch (etd->hw_version) {
393 case 1:
394 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
395 return PSMOUSE_BAD_DATA;
396
397 elantech_report_absolute_v1(psmouse);
398 break;
399
400 case 2:
401 /* We don't know how to check parity in protocol v2 */
402 elantech_report_absolute_v2(psmouse);
403 break;
404 }
405
406 return PSMOUSE_FULL_PACKET;
407}
408
409/*
410 * Put the touchpad into absolute mode
411 */
412static int elantech_set_absolute_mode(struct psmouse *psmouse)
413{
414 struct elantech_data *etd = psmouse->private;
415 unsigned char val;
416 int tries = ETP_READ_BACK_TRIES;
417 int rc = 0;
418
419 switch (etd->hw_version) {
420 case 1:
421 etd->reg_10 = 0x16;
422 etd->reg_11 = 0x8f;
423 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
424 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
425 rc = -1;
426 }
427 break;
428
429 case 2:
430 /* Windows driver values */
431 etd->reg_10 = 0x54;
432 etd->reg_11 = 0x88; /* 0x8a */
433 etd->reg_21 = 0x60; /* 0x00 */
434 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
435 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
436 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
437 rc = -1;
438 break;
439 }
440 }
441
442 if (rc == 0) {
443 /*
444 * Read back reg 0x10. For hardware version 1 we must make
445 * sure the absolute mode bit is set. For hardware version 2
446 * the touchpad is probably initalising and not ready until
447 * we read back the value we just wrote.
448 */
449 do {
450 rc = elantech_read_reg(psmouse, 0x10, &val);
451 if (rc == 0)
452 break;
453 tries--;
454 elantech_debug("retrying read (%d).\n", tries);
455 msleep(ETP_READ_BACK_DELAY);
456 } while (tries > 0);
457
458 if (rc) {
459 pr_err("failed to read back register 0x10.\n");
460 } else if (etd->hw_version == 1 &&
461 !(val & ETP_R10_ABSOLUTE_MODE)) {
462 pr_err("touchpad refuses to switch to absolute mode.\n");
463 rc = -1;
464 }
465 }
466
467 if (rc)
468 pr_err("failed to initialise registers.\n");
469
470 return rc;
471}
472
473/*
474 * Set the appropriate event bits for the input subsystem
475 */
476static void elantech_set_input_params(struct psmouse *psmouse)
477{
478 struct input_dev *dev = psmouse->dev;
479 struct elantech_data *etd = psmouse->private;
480
481 __set_bit(EV_KEY, dev->evbit);
482 __set_bit(EV_ABS, dev->evbit);
483 __clear_bit(EV_REL, dev->evbit);
484
485 __set_bit(BTN_LEFT, dev->keybit);
486 __set_bit(BTN_RIGHT, dev->keybit);
487
488 __set_bit(BTN_TOUCH, dev->keybit);
489 __set_bit(BTN_TOOL_FINGER, dev->keybit);
490 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
491 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
492
493 switch (etd->hw_version) {
494 case 1:
495 /* Rocker button */
496 if (etd->fw_version < 0x020000 &&
497 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
498 __set_bit(BTN_FORWARD, dev->keybit);
499 __set_bit(BTN_BACK, dev->keybit);
500 }
501 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
502 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
503 break;
504
505 case 2:
506 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
507 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
508 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
509 if (etd->reports_pressure) {
510 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
511 ETP_PMAX_V2, 0, 0);
512 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
513 ETP_WMAX_V2, 0, 0);
514 }
515 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
516 input_mt_init_slots(dev, 2);
517 input_set_abs_params(dev, ABS_MT_POSITION_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
518 input_set_abs_params(dev, ABS_MT_POSITION_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
519 break;
520 }
521}
522
523struct elantech_attr_data {
524 size_t field_offset;
525 unsigned char reg;
526};
527
528/*
529 * Display a register value by reading a sysfs entry
530 */
531static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
532 char *buf)
533{
534 struct elantech_data *etd = psmouse->private;
535 struct elantech_attr_data *attr = data;
536 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
537 int rc = 0;
538
539 if (attr->reg)
540 rc = elantech_read_reg(psmouse, attr->reg, reg);
541
542 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
543}
544
545/*
546 * Write a register value by writing a sysfs entry
547 */
548static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
549 void *data, const char *buf, size_t count)
550{
551 struct elantech_data *etd = psmouse->private;
552 struct elantech_attr_data *attr = data;
553 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
554 unsigned long value;
555 int err;
556
557 err = strict_strtoul(buf, 16, &value);
558 if (err)
559 return err;
560
561 if (value > 0xff)
562 return -EINVAL;
563
564 /* Do we need to preserve some bits for version 2 hardware too? */
565 if (etd->hw_version == 1) {
566 if (attr->reg == 0x10)
567 /* Force absolute mode always on */
568 value |= ETP_R10_ABSOLUTE_MODE;
569 else if (attr->reg == 0x11)
570 /* Force 4 byte mode always on */
571 value |= ETP_R11_4_BYTE_MODE;
572 }
573
574 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
575 *reg = value;
576
577 return count;
578}
579
580#define ELANTECH_INT_ATTR(_name, _register) \
581 static struct elantech_attr_data elantech_attr_##_name = { \
582 .field_offset = offsetof(struct elantech_data, _name), \
583 .reg = _register, \
584 }; \
585 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
586 &elantech_attr_##_name, \
587 elantech_show_int_attr, \
588 elantech_set_int_attr)
589
590ELANTECH_INT_ATTR(reg_10, 0x10);
591ELANTECH_INT_ATTR(reg_11, 0x11);
592ELANTECH_INT_ATTR(reg_20, 0x20);
593ELANTECH_INT_ATTR(reg_21, 0x21);
594ELANTECH_INT_ATTR(reg_22, 0x22);
595ELANTECH_INT_ATTR(reg_23, 0x23);
596ELANTECH_INT_ATTR(reg_24, 0x24);
597ELANTECH_INT_ATTR(reg_25, 0x25);
598ELANTECH_INT_ATTR(reg_26, 0x26);
599ELANTECH_INT_ATTR(debug, 0);
600ELANTECH_INT_ATTR(paritycheck, 0);
601
602static struct attribute *elantech_attrs[] = {
603 &psmouse_attr_reg_10.dattr.attr,
604 &psmouse_attr_reg_11.dattr.attr,
605 &psmouse_attr_reg_20.dattr.attr,
606 &psmouse_attr_reg_21.dattr.attr,
607 &psmouse_attr_reg_22.dattr.attr,
608 &psmouse_attr_reg_23.dattr.attr,
609 &psmouse_attr_reg_24.dattr.attr,
610 &psmouse_attr_reg_25.dattr.attr,
611 &psmouse_attr_reg_26.dattr.attr,
612 &psmouse_attr_debug.dattr.attr,
613 &psmouse_attr_paritycheck.dattr.attr,
614 NULL
615};
616
617static struct attribute_group elantech_attr_group = {
618 .attrs = elantech_attrs,
619};
620
621static bool elantech_is_signature_valid(const unsigned char *param)
622{
623 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
624 int i;
625
626 if (param[0] == 0)
627 return false;
628
629 if (param[1] == 0)
630 return true;
631
632 for (i = 0; i < ARRAY_SIZE(rates); i++)
633 if (param[2] == rates[i])
634 return false;
635
636 return true;
637}
638
639/*
640 * Use magic knock to detect Elantech touchpad
641 */
642int elantech_detect(struct psmouse *psmouse, bool set_properties)
643{
644 struct ps2dev *ps2dev = &psmouse->ps2dev;
645 unsigned char param[3];
646
647 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
648
649 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
650 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
651 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
652 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
653 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
654 pr_debug("sending Elantech magic knock failed.\n");
655 return -1;
656 }
657
658 /*
659 * Report this in case there are Elantech models that use a different
660 * set of magic numbers
661 */
662 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
663 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
664 param[0], param[1], param[2]);
665 return -1;
666 }
667
668 /*
669 * Query touchpad's firmware version and see if it reports known
670 * value to avoid mis-detection. Logitech mice are known to respond
671 * to Elantech magic knock and there might be more.
672 */
673 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
674 pr_debug("failed to query firmware version.\n");
675 return -1;
676 }
677
678 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
679 param[0], param[1], param[2]);
680
681 if (!elantech_is_signature_valid(param)) {
682 if (!force_elantech) {
683 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
684 return -1;
685 }
686
687 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
688 }
689
690 if (set_properties) {
691 psmouse->vendor = "Elantech";
692 psmouse->name = "Touchpad";
693 }
694
695 return 0;
696}
697
698/*
699 * Clean up sysfs entries when disconnecting
700 */
701static void elantech_disconnect(struct psmouse *psmouse)
702{
703 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
704 &elantech_attr_group);
705 kfree(psmouse->private);
706 psmouse->private = NULL;
707}
708
709/*
710 * Put the touchpad back into absolute mode when reconnecting
711 */
712static int elantech_reconnect(struct psmouse *psmouse)
713{
714 if (elantech_detect(psmouse, 0))
715 return -1;
716
717 if (elantech_set_absolute_mode(psmouse)) {
718 pr_err("failed to put touchpad back into absolute mode.\n");
719 return -1;
720 }
721
722 return 0;
723}
724
725/*
726 * Initialize the touchpad and create sysfs entries
727 */
728int elantech_init(struct psmouse *psmouse)
729{
730 struct elantech_data *etd;
731 int i, error;
732 unsigned char param[3];
733
734 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
735 if (!etd)
736 return -ENOMEM;
737
738 etd->parity[0] = 1;
739 for (i = 1; i < 256; i++)
740 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
741
742 /*
743 * Do the version query again so we can store the result
744 */
745 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
746 pr_err("failed to query firmware version.\n");
747 goto init_fail;
748 }
749
750 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
751
752 /*
753 * Assume every version greater than this is new EeePC style
754 * hardware with 6 byte packets
755 */
756 if (etd->fw_version >= 0x020030) {
757 etd->hw_version = 2;
758 /* For now show extra debug information */
759 etd->debug = 1;
760 /* Don't know how to do parity checking for version 2 */
761 etd->paritycheck = 0;
762
763 if (etd->fw_version >= 0x020800)
764 etd->reports_pressure = true;
765
766 } else {
767 etd->hw_version = 1;
768 etd->paritycheck = 1;
769 }
770
771 pr_info("assuming hardware version %d, firmware version %d.%d.%d\n",
772 etd->hw_version, param[0], param[1], param[2]);
773
774 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
775 pr_err("failed to query capabilities.\n");
776 goto init_fail;
777 }
778 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
779 param[0], param[1], param[2]);
780 etd->capabilities = param[0];
781
782 /*
783 * This firmware suffers from misreporting coordinates when
784 * a touch action starts causing the mouse cursor or scrolled page
785 * to jump. Enable a workaround.
786 */
787 if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) {
788 pr_info("firmware version 2.0.34/2.6.0 detected, enabling jumpy cursor workaround\n");
789 etd->jumpy_cursor = true;
790 }
791
792 if (elantech_set_absolute_mode(psmouse)) {
793 pr_err("failed to put touchpad into absolute mode.\n");
794 goto init_fail;
795 }
796
797 elantech_set_input_params(psmouse);
798
799 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
800 &elantech_attr_group);
801 if (error) {
802 pr_err("failed to create sysfs attributes, error: %d.\n", error);
803 goto init_fail;
804 }
805
806 psmouse->protocol_handler = elantech_process_byte;
807 psmouse->disconnect = elantech_disconnect;
808 psmouse->reconnect = elantech_reconnect;
809 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
810
811 return 0;
812
813 init_fail:
814 kfree(etd);
815 return -1;
816}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Elantech Touchpad driver (v6)
4 *
5 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
6 *
7 * Trademarks are the property of their respective owners.
8 */
9
10#include <linux/delay.h>
11#include <linux/dmi.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/i2c.h>
15#include <linux/input.h>
16#include <linux/input/mt.h>
17#include <linux/platform_device.h>
18#include <linux/serio.h>
19#include <linux/libps2.h>
20#include <asm/unaligned.h>
21#include "psmouse.h"
22#include "elantech.h"
23#include "elan_i2c.h"
24
25#define elantech_debug(fmt, ...) \
26 do { \
27 if (etd->info.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 */
35static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
36 unsigned char *param)
37{
38 if (ps2_sliced_command(&psmouse->ps2dev, 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 */
50static 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 */
68static 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 3 bytes from a register
94 */
95static int elantech_read_reg_params(struct psmouse *psmouse, u8 reg, u8 *param)
96{
97 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
98 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
99 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
100 elantech_ps2_command(psmouse, NULL, reg) ||
101 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
102 psmouse_err(psmouse,
103 "failed to read register %#02x\n", reg);
104 return -EIO;
105 }
106
107 return 0;
108}
109
110/*
111 * Send an Elantech style special command to write a register with a parameter
112 */
113static int elantech_write_reg_params(struct psmouse *psmouse, u8 reg, u8 *param)
114{
115 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
116 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
117 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
118 elantech_ps2_command(psmouse, NULL, reg) ||
119 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
120 elantech_ps2_command(psmouse, NULL, param[0]) ||
121 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
122 elantech_ps2_command(psmouse, NULL, param[1]) ||
123 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
124 psmouse_err(psmouse,
125 "failed to write register %#02x with value %#02x%#02x\n",
126 reg, param[0], param[1]);
127 return -EIO;
128 }
129
130 return 0;
131}
132
133/*
134 * Send an Elantech style special command to read a value from a register
135 */
136static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
137 unsigned char *val)
138{
139 struct elantech_data *etd = psmouse->private;
140 unsigned char param[3];
141 int rc = 0;
142
143 if (reg < 0x07 || reg > 0x26)
144 return -1;
145
146 if (reg > 0x11 && reg < 0x20)
147 return -1;
148
149 switch (etd->info.hw_version) {
150 case 1:
151 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_READ) ||
152 ps2_sliced_command(&psmouse->ps2dev, reg) ||
153 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
154 rc = -1;
155 }
156 break;
157
158 case 2:
159 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
160 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
161 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
162 elantech_ps2_command(psmouse, NULL, reg) ||
163 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
164 rc = -1;
165 }
166 break;
167
168 case 3 ... 4:
169 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
170 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
171 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
172 elantech_ps2_command(psmouse, NULL, reg) ||
173 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
174 rc = -1;
175 }
176 break;
177 }
178
179 if (rc)
180 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
181 else if (etd->info.hw_version != 4)
182 *val = param[0];
183 else
184 *val = param[1];
185
186 return rc;
187}
188
189/*
190 * Send an Elantech style special command to write a register with a value
191 */
192static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
193 unsigned char val)
194{
195 struct elantech_data *etd = psmouse->private;
196 int rc = 0;
197
198 if (reg < 0x07 || reg > 0x26)
199 return -1;
200
201 if (reg > 0x11 && reg < 0x20)
202 return -1;
203
204 switch (etd->info.hw_version) {
205 case 1:
206 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_WRITE) ||
207 ps2_sliced_command(&psmouse->ps2dev, reg) ||
208 ps2_sliced_command(&psmouse->ps2dev, val) ||
209 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
210 rc = -1;
211 }
212 break;
213
214 case 2:
215 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
216 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
217 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
218 elantech_ps2_command(psmouse, NULL, reg) ||
219 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
220 elantech_ps2_command(psmouse, NULL, val) ||
221 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
222 rc = -1;
223 }
224 break;
225
226 case 3:
227 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
228 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
229 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
230 elantech_ps2_command(psmouse, NULL, reg) ||
231 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
232 elantech_ps2_command(psmouse, NULL, val) ||
233 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
234 rc = -1;
235 }
236 break;
237
238 case 4:
239 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
240 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
241 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
242 elantech_ps2_command(psmouse, NULL, reg) ||
243 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
244 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
245 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
246 elantech_ps2_command(psmouse, NULL, val) ||
247 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
248 rc = -1;
249 }
250 break;
251 }
252
253 if (rc)
254 psmouse_err(psmouse,
255 "failed to write register 0x%02x with value 0x%02x.\n",
256 reg, val);
257
258 return rc;
259}
260
261/*
262 * Dump a complete mouse movement packet to the syslog
263 */
264static void elantech_packet_dump(struct psmouse *psmouse)
265{
266 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]\n",
267 psmouse->pktsize, psmouse->packet);
268}
269
270/*
271 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
272 * fw_version for this is based on the following fw_version & caps table:
273 *
274 * Laptop-model: fw_version: caps: buttons:
275 * Acer S3 0x461f00 10, 13, 0e clickpad
276 * Acer S7-392 0x581f01 50, 17, 0d clickpad
277 * Acer V5-131 0x461f02 01, 16, 0c clickpad
278 * Acer V5-551 0x461f00 ? clickpad
279 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons
280 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons
281 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons
282 * Asus TP500LN 0x381f17 10, 14, 0e clickpad
283 * Asus X750JN 0x381f17 10, 14, 0e clickpad
284 * Asus UX31 0x361f00 20, 15, 0e clickpad
285 * Asus UX32VD 0x361f02 00, 15, 0e clickpad
286 * Avatar AVIU-145A2 0x361f00 ? clickpad
287 * Fujitsu CELSIUS H760 0x570f02 40, 14, 0c 3 hw buttons (**)
288 * Fujitsu CELSIUS H780 0x5d0f02 41, 16, 0d 3 hw buttons (**)
289 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons
290 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons
291 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons
292 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons
293 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons
294 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons
295 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**)
296 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons
297 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*)
298 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*)
299 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons
300 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad
301 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad
302 * Samsung NP900X3E-A02 0x575f03 ? clickpad
303 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad
304 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons
305 * Samsung RF710 0x450f00 ? 2 hw buttons
306 * System76 Pangolin 0x250f01 ? 2 hw buttons
307 * (*) + 3 trackpoint buttons
308 * (**) + 0 trackpoint buttons
309 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps
310 */
311static inline int elantech_is_buttonpad(struct elantech_device_info *info)
312{
313 return info->fw_version & 0x001000;
314}
315
316/*
317 * Interpret complete data packets and report absolute mode input events for
318 * hardware version 1. (4 byte packets)
319 */
320static void elantech_report_absolute_v1(struct psmouse *psmouse)
321{
322 struct input_dev *dev = psmouse->dev;
323 struct elantech_data *etd = psmouse->private;
324 unsigned char *packet = psmouse->packet;
325 int fingers;
326
327 if (etd->info.fw_version < 0x020000) {
328 /*
329 * byte 0: D U p1 p2 1 p3 R L
330 * byte 1: f 0 th tw x9 x8 y9 y8
331 */
332 fingers = ((packet[1] & 0x80) >> 7) +
333 ((packet[1] & 0x30) >> 4);
334 } else {
335 /*
336 * byte 0: n1 n0 p2 p1 1 p3 R L
337 * byte 1: 0 0 0 0 x9 x8 y9 y8
338 */
339 fingers = (packet[0] & 0xc0) >> 6;
340 }
341
342 if (etd->info.jumpy_cursor) {
343 if (fingers != 1) {
344 etd->single_finger_reports = 0;
345 } else if (etd->single_finger_reports < 2) {
346 /* Discard first 2 reports of one finger, bogus */
347 etd->single_finger_reports++;
348 elantech_debug("discarding packet\n");
349 return;
350 }
351 }
352
353 input_report_key(dev, BTN_TOUCH, fingers != 0);
354
355 /*
356 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
357 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
358 */
359 if (fingers) {
360 input_report_abs(dev, ABS_X,
361 ((packet[1] & 0x0c) << 6) | packet[2]);
362 input_report_abs(dev, ABS_Y,
363 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
364 }
365
366 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
367 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
368 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
369
370 psmouse_report_standard_buttons(dev, packet[0]);
371
372 if (etd->info.fw_version < 0x020000 &&
373 (etd->info.capabilities[0] & ETP_CAP_HAS_ROCKER)) {
374 /* rocker up */
375 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
376 /* rocker down */
377 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
378 }
379
380 input_sync(dev);
381}
382
383static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
384 unsigned int x, unsigned int y)
385{
386 input_mt_slot(dev, slot);
387 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
388 if (active) {
389 input_report_abs(dev, ABS_MT_POSITION_X, x);
390 input_report_abs(dev, ABS_MT_POSITION_Y, y);
391 }
392}
393
394/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
395static void elantech_report_semi_mt_data(struct input_dev *dev,
396 unsigned int num_fingers,
397 unsigned int x1, unsigned int y1,
398 unsigned int x2, unsigned int y2)
399{
400 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
401 elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2);
402}
403
404/*
405 * Interpret complete data packets and report absolute mode input events for
406 * hardware version 2. (6 byte packets)
407 */
408static void elantech_report_absolute_v2(struct psmouse *psmouse)
409{
410 struct elantech_data *etd = psmouse->private;
411 struct input_dev *dev = psmouse->dev;
412 unsigned char *packet = psmouse->packet;
413 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
414 unsigned int width = 0, pres = 0;
415
416 /* byte 0: n1 n0 . . . . R L */
417 fingers = (packet[0] & 0xc0) >> 6;
418
419 switch (fingers) {
420 case 3:
421 /*
422 * Same as one finger, except report of more than 3 fingers:
423 * byte 3: n4 . w1 w0 . . . .
424 */
425 if (packet[3] & 0x80)
426 fingers = 4;
427 fallthrough;
428 case 1:
429 /*
430 * byte 1: . . . . x11 x10 x9 x8
431 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
432 */
433 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
434 /*
435 * byte 4: . . . . y11 y10 y9 y8
436 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
437 */
438 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
439
440 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
441 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
442 break;
443
444 case 2:
445 /*
446 * The coordinate of each finger is reported separately
447 * with a lower resolution for two finger touches:
448 * byte 0: . . ay8 ax8 . . . .
449 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
450 */
451 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
452 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
453 y1 = etd->y_max -
454 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
455 /*
456 * byte 3: . . by8 bx8 . . . .
457 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
458 */
459 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
460 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
461 y2 = etd->y_max -
462 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
463
464 /* Unknown so just report sensible values */
465 pres = 127;
466 width = 7;
467 break;
468 }
469
470 input_report_key(dev, BTN_TOUCH, fingers != 0);
471 if (fingers != 0) {
472 input_report_abs(dev, ABS_X, x1);
473 input_report_abs(dev, ABS_Y, y1);
474 }
475 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
476 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
477 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
478 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
479 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
480 psmouse_report_standard_buttons(dev, packet[0]);
481 if (etd->info.reports_pressure) {
482 input_report_abs(dev, ABS_PRESSURE, pres);
483 input_report_abs(dev, ABS_TOOL_WIDTH, width);
484 }
485
486 input_sync(dev);
487}
488
489static void elantech_report_trackpoint(struct psmouse *psmouse,
490 int packet_type)
491{
492 /*
493 * byte 0: 0 0 sx sy 0 M R L
494 * byte 1:~sx 0 0 0 0 0 0 0
495 * byte 2:~sy 0 0 0 0 0 0 0
496 * byte 3: 0 0 ~sy ~sx 0 1 1 0
497 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0
498 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
499 *
500 * x and y are written in two's complement spread
501 * over 9 bits with sx/sy the relative top bit and
502 * x7..x0 and y7..y0 the lower bits.
503 * The sign of y is opposite to what the input driver
504 * expects for a relative movement
505 */
506
507 struct elantech_data *etd = psmouse->private;
508 struct input_dev *tp_dev = etd->tp_dev;
509 unsigned char *packet = psmouse->packet;
510 int x, y;
511 u32 t;
512
513 t = get_unaligned_le32(&packet[0]);
514
515 switch (t & ~7U) {
516 case 0x06000030U:
517 case 0x16008020U:
518 case 0x26800010U:
519 case 0x36808000U:
520
521 /*
522 * This firmware misreport coordinates for trackpoint
523 * occasionally. Discard packets outside of [-127, 127] range
524 * to prevent cursor jumps.
525 */
526 if (packet[4] == 0x80 || packet[5] == 0x80 ||
527 packet[1] >> 7 == packet[4] >> 7 ||
528 packet[2] >> 7 == packet[5] >> 7) {
529 elantech_debug("discarding packet [%6ph]\n", packet);
530 break;
531
532 }
533 x = packet[4] - (int)((packet[1]^0x80) << 1);
534 y = (int)((packet[2]^0x80) << 1) - packet[5];
535
536 psmouse_report_standard_buttons(tp_dev, packet[0]);
537
538 input_report_rel(tp_dev, REL_X, x);
539 input_report_rel(tp_dev, REL_Y, y);
540
541 input_sync(tp_dev);
542
543 break;
544
545 default:
546 /* Dump unexpected packet sequences if debug=1 (default) */
547 if (etd->info.debug == 1)
548 elantech_packet_dump(psmouse);
549
550 break;
551 }
552}
553
554/*
555 * Interpret complete data packets and report absolute mode input events for
556 * hardware version 3. (12 byte packets for two fingers)
557 */
558static void elantech_report_absolute_v3(struct psmouse *psmouse,
559 int packet_type)
560{
561 struct input_dev *dev = psmouse->dev;
562 struct elantech_data *etd = psmouse->private;
563 unsigned char *packet = psmouse->packet;
564 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
565 unsigned int width = 0, pres = 0;
566
567 /* byte 0: n1 n0 . . . . R L */
568 fingers = (packet[0] & 0xc0) >> 6;
569
570 switch (fingers) {
571 case 3:
572 case 1:
573 /*
574 * byte 1: . . . . x11 x10 x9 x8
575 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
576 */
577 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
578 /*
579 * byte 4: . . . . y11 y10 y9 y8
580 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
581 */
582 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
583 break;
584
585 case 2:
586 if (packet_type == PACKET_V3_HEAD) {
587 /*
588 * byte 1: . . . . ax11 ax10 ax9 ax8
589 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
590 */
591 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
592 /*
593 * byte 4: . . . . ay11 ay10 ay9 ay8
594 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
595 */
596 etd->mt[0].y = etd->y_max -
597 (((packet[4] & 0x0f) << 8) | packet[5]);
598 /*
599 * wait for next packet
600 */
601 return;
602 }
603
604 /* packet_type == PACKET_V3_TAIL */
605 x1 = etd->mt[0].x;
606 y1 = etd->mt[0].y;
607 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
608 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
609 break;
610 }
611
612 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
613 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
614
615 input_report_key(dev, BTN_TOUCH, fingers != 0);
616 if (fingers != 0) {
617 input_report_abs(dev, ABS_X, x1);
618 input_report_abs(dev, ABS_Y, y1);
619 }
620 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
621 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
622 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
623 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
624
625 /* For clickpads map both buttons to BTN_LEFT */
626 if (elantech_is_buttonpad(&etd->info))
627 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
628 else
629 psmouse_report_standard_buttons(dev, packet[0]);
630
631 input_report_abs(dev, ABS_PRESSURE, pres);
632 input_report_abs(dev, ABS_TOOL_WIDTH, width);
633
634 input_sync(dev);
635}
636
637static void elantech_input_sync_v4(struct psmouse *psmouse)
638{
639 struct input_dev *dev = psmouse->dev;
640 struct elantech_data *etd = psmouse->private;
641 unsigned char *packet = psmouse->packet;
642
643 /* For clickpads map both buttons to BTN_LEFT */
644 if (elantech_is_buttonpad(&etd->info))
645 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
646 else
647 psmouse_report_standard_buttons(dev, packet[0]);
648
649 input_mt_report_pointer_emulation(dev, true);
650 input_sync(dev);
651}
652
653static void process_packet_status_v4(struct psmouse *psmouse)
654{
655 struct input_dev *dev = psmouse->dev;
656 unsigned char *packet = psmouse->packet;
657 unsigned fingers;
658 int i;
659
660 /* notify finger state change */
661 fingers = packet[1] & 0x1f;
662 for (i = 0; i < ETP_MAX_FINGERS; i++) {
663 if ((fingers & (1 << i)) == 0) {
664 input_mt_slot(dev, i);
665 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
666 }
667 }
668
669 elantech_input_sync_v4(psmouse);
670}
671
672static void process_packet_head_v4(struct psmouse *psmouse)
673{
674 struct input_dev *dev = psmouse->dev;
675 struct elantech_data *etd = psmouse->private;
676 unsigned char *packet = psmouse->packet;
677 int id;
678 int pres, traces;
679
680 id = ((packet[3] & 0xe0) >> 5) - 1;
681 if (id < 0 || id >= ETP_MAX_FINGERS)
682 return;
683
684 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
685 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
686 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
687 traces = (packet[0] & 0xf0) >> 4;
688
689 input_mt_slot(dev, id);
690 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
691
692 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
693 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
694 input_report_abs(dev, ABS_MT_PRESSURE, pres);
695 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
696 /* report this for backwards compatibility */
697 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
698
699 elantech_input_sync_v4(psmouse);
700}
701
702static void process_packet_motion_v4(struct psmouse *psmouse)
703{
704 struct input_dev *dev = psmouse->dev;
705 struct elantech_data *etd = psmouse->private;
706 unsigned char *packet = psmouse->packet;
707 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
708 int id, sid;
709
710 id = ((packet[0] & 0xe0) >> 5) - 1;
711 if (id < 0 || id >= ETP_MAX_FINGERS)
712 return;
713
714 sid = ((packet[3] & 0xe0) >> 5) - 1;
715 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
716 /*
717 * Motion packets give us the delta of x, y values of specific fingers,
718 * but in two's complement. Let the compiler do the conversion for us.
719 * Also _enlarge_ the numbers to int, in case of overflow.
720 */
721 delta_x1 = (signed char)packet[1];
722 delta_y1 = (signed char)packet[2];
723 delta_x2 = (signed char)packet[4];
724 delta_y2 = (signed char)packet[5];
725
726 etd->mt[id].x += delta_x1 * weight;
727 etd->mt[id].y -= delta_y1 * weight;
728 input_mt_slot(dev, id);
729 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
730 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
731
732 if (sid >= 0 && sid < ETP_MAX_FINGERS) {
733 etd->mt[sid].x += delta_x2 * weight;
734 etd->mt[sid].y -= delta_y2 * weight;
735 input_mt_slot(dev, sid);
736 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
737 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
738 }
739
740 elantech_input_sync_v4(psmouse);
741}
742
743static void elantech_report_absolute_v4(struct psmouse *psmouse,
744 int packet_type)
745{
746 switch (packet_type) {
747 case PACKET_V4_STATUS:
748 process_packet_status_v4(psmouse);
749 break;
750
751 case PACKET_V4_HEAD:
752 process_packet_head_v4(psmouse);
753 break;
754
755 case PACKET_V4_MOTION:
756 process_packet_motion_v4(psmouse);
757 break;
758
759 case PACKET_UNKNOWN:
760 default:
761 /* impossible to get here */
762 break;
763 }
764}
765
766static int elantech_packet_check_v1(struct psmouse *psmouse)
767{
768 struct elantech_data *etd = psmouse->private;
769 unsigned char *packet = psmouse->packet;
770 unsigned char p1, p2, p3;
771
772 /* Parity bits are placed differently */
773 if (etd->info.fw_version < 0x020000) {
774 /* byte 0: D U p1 p2 1 p3 R L */
775 p1 = (packet[0] & 0x20) >> 5;
776 p2 = (packet[0] & 0x10) >> 4;
777 } else {
778 /* byte 0: n1 n0 p2 p1 1 p3 R L */
779 p1 = (packet[0] & 0x10) >> 4;
780 p2 = (packet[0] & 0x20) >> 5;
781 }
782
783 p3 = (packet[0] & 0x04) >> 2;
784
785 return etd->parity[packet[1]] == p1 &&
786 etd->parity[packet[2]] == p2 &&
787 etd->parity[packet[3]] == p3;
788}
789
790static int elantech_debounce_check_v2(struct psmouse *psmouse)
791{
792 /*
793 * When we encounter packet that matches this exactly, it means the
794 * hardware is in debounce status. Just ignore the whole packet.
795 */
796 static const u8 debounce_packet[] = {
797 0x84, 0xff, 0xff, 0x02, 0xff, 0xff
798 };
799 unsigned char *packet = psmouse->packet;
800
801 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
802}
803
804static int elantech_packet_check_v2(struct psmouse *psmouse)
805{
806 struct elantech_data *etd = psmouse->private;
807 unsigned char *packet = psmouse->packet;
808
809 /*
810 * V2 hardware has two flavors. Older ones that do not report pressure,
811 * and newer ones that reports pressure and width. With newer ones, all
812 * packets (1, 2, 3 finger touch) have the same constant bits. With
813 * older ones, 1/3 finger touch packets and 2 finger touch packets
814 * have different constant bits.
815 * With all three cases, if the constant bits are not exactly what I
816 * expected, I consider them invalid.
817 */
818 if (etd->info.reports_pressure)
819 return (packet[0] & 0x0c) == 0x04 &&
820 (packet[3] & 0x0f) == 0x02;
821
822 if ((packet[0] & 0xc0) == 0x80)
823 return (packet[0] & 0x0c) == 0x0c &&
824 (packet[3] & 0x0e) == 0x08;
825
826 return (packet[0] & 0x3c) == 0x3c &&
827 (packet[1] & 0xf0) == 0x00 &&
828 (packet[3] & 0x3e) == 0x38 &&
829 (packet[4] & 0xf0) == 0x00;
830}
831
832/*
833 * We check the constant bits to determine what packet type we get,
834 * so packet checking is mandatory for v3 and later hardware.
835 */
836static int elantech_packet_check_v3(struct psmouse *psmouse)
837{
838 struct elantech_data *etd = psmouse->private;
839 static const u8 debounce_packet[] = {
840 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff
841 };
842 unsigned char *packet = psmouse->packet;
843
844 /*
845 * check debounce first, it has the same signature in byte 0
846 * and byte 3 as PACKET_V3_HEAD.
847 */
848 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
849 return PACKET_DEBOUNCE;
850
851 /*
852 * If the hardware flag 'crc_enabled' is set the packets have
853 * different signatures.
854 */
855 if (etd->info.crc_enabled) {
856 if ((packet[3] & 0x09) == 0x08)
857 return PACKET_V3_HEAD;
858
859 if ((packet[3] & 0x09) == 0x09)
860 return PACKET_V3_TAIL;
861 } else {
862 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
863 return PACKET_V3_HEAD;
864
865 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
866 return PACKET_V3_TAIL;
867 if ((packet[3] & 0x0f) == 0x06)
868 return PACKET_TRACKPOINT;
869 }
870
871 return PACKET_UNKNOWN;
872}
873
874static int elantech_packet_check_v4(struct psmouse *psmouse)
875{
876 struct elantech_data *etd = psmouse->private;
877 unsigned char *packet = psmouse->packet;
878 unsigned char packet_type = packet[3] & 0x03;
879 unsigned int ic_version;
880 bool sanity_check;
881
882 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
883 return PACKET_TRACKPOINT;
884
885 /* This represents the version of IC body. */
886 ic_version = (etd->info.fw_version & 0x0f0000) >> 16;
887
888 /*
889 * Sanity check based on the constant bits of a packet.
890 * The constant bits change depending on the value of
891 * the hardware flag 'crc_enabled' and the version of
892 * the IC body, but are the same for every packet,
893 * regardless of the type.
894 */
895 if (etd->info.crc_enabled)
896 sanity_check = ((packet[3] & 0x08) == 0x00);
897 else if (ic_version == 7 && etd->info.samples[1] == 0x2A)
898 sanity_check = ((packet[3] & 0x1c) == 0x10);
899 else
900 sanity_check = ((packet[0] & 0x08) == 0x00 &&
901 (packet[3] & 0x1c) == 0x10);
902
903 if (!sanity_check)
904 return PACKET_UNKNOWN;
905
906 switch (packet_type) {
907 case 0:
908 return PACKET_V4_STATUS;
909
910 case 1:
911 return PACKET_V4_HEAD;
912
913 case 2:
914 return PACKET_V4_MOTION;
915 }
916
917 return PACKET_UNKNOWN;
918}
919
920/*
921 * Process byte stream from mouse and handle complete packets
922 */
923static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
924{
925 struct elantech_data *etd = psmouse->private;
926 int packet_type;
927
928 if (psmouse->pktcnt < psmouse->pktsize)
929 return PSMOUSE_GOOD_DATA;
930
931 if (etd->info.debug > 1)
932 elantech_packet_dump(psmouse);
933
934 switch (etd->info.hw_version) {
935 case 1:
936 if (etd->info.paritycheck && !elantech_packet_check_v1(psmouse))
937 return PSMOUSE_BAD_DATA;
938
939 elantech_report_absolute_v1(psmouse);
940 break;
941
942 case 2:
943 /* ignore debounce */
944 if (elantech_debounce_check_v2(psmouse))
945 return PSMOUSE_FULL_PACKET;
946
947 if (etd->info.paritycheck && !elantech_packet_check_v2(psmouse))
948 return PSMOUSE_BAD_DATA;
949
950 elantech_report_absolute_v2(psmouse);
951 break;
952
953 case 3:
954 packet_type = elantech_packet_check_v3(psmouse);
955 switch (packet_type) {
956 case PACKET_UNKNOWN:
957 return PSMOUSE_BAD_DATA;
958
959 case PACKET_DEBOUNCE:
960 /* ignore debounce */
961 break;
962
963 case PACKET_TRACKPOINT:
964 elantech_report_trackpoint(psmouse, packet_type);
965 break;
966
967 default:
968 elantech_report_absolute_v3(psmouse, packet_type);
969 break;
970 }
971
972 break;
973
974 case 4:
975 packet_type = elantech_packet_check_v4(psmouse);
976 switch (packet_type) {
977 case PACKET_UNKNOWN:
978 return PSMOUSE_BAD_DATA;
979
980 case PACKET_TRACKPOINT:
981 elantech_report_trackpoint(psmouse, packet_type);
982 break;
983
984 default:
985 elantech_report_absolute_v4(psmouse, packet_type);
986 break;
987 }
988
989 break;
990 }
991
992 return PSMOUSE_FULL_PACKET;
993}
994
995/*
996 * This writes the reg_07 value again to the hardware at the end of every
997 * set_rate call because the register loses its value. reg_07 allows setting
998 * absolute mode on v4 hardware
999 */
1000static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse,
1001 unsigned int rate)
1002{
1003 struct elantech_data *etd = psmouse->private;
1004
1005 etd->original_set_rate(psmouse, rate);
1006 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
1007 psmouse_err(psmouse, "restoring reg_07 failed\n");
1008}
1009
1010/*
1011 * Put the touchpad into absolute mode
1012 */
1013static int elantech_set_absolute_mode(struct psmouse *psmouse)
1014{
1015 struct elantech_data *etd = psmouse->private;
1016 unsigned char val;
1017 int tries = ETP_READ_BACK_TRIES;
1018 int rc = 0;
1019
1020 switch (etd->info.hw_version) {
1021 case 1:
1022 etd->reg_10 = 0x16;
1023 etd->reg_11 = 0x8f;
1024 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
1025 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
1026 rc = -1;
1027 }
1028 break;
1029
1030 case 2:
1031 /* Windows driver values */
1032 etd->reg_10 = 0x54;
1033 etd->reg_11 = 0x88; /* 0x8a */
1034 etd->reg_21 = 0x60; /* 0x00 */
1035 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
1036 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
1037 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
1038 rc = -1;
1039 }
1040 break;
1041
1042 case 3:
1043 if (etd->info.set_hw_resolution)
1044 etd->reg_10 = 0x0b;
1045 else
1046 etd->reg_10 = 0x01;
1047
1048 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
1049 rc = -1;
1050
1051 break;
1052
1053 case 4:
1054 etd->reg_07 = 0x01;
1055 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
1056 rc = -1;
1057
1058 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
1059 }
1060
1061 if (rc == 0) {
1062 /*
1063 * Read back reg 0x10. For hardware version 1 we must make
1064 * sure the absolute mode bit is set. For hardware version 2
1065 * the touchpad is probably initializing and not ready until
1066 * we read back the value we just wrote.
1067 */
1068 do {
1069 rc = elantech_read_reg(psmouse, 0x10, &val);
1070 if (rc == 0)
1071 break;
1072 tries--;
1073 elantech_debug("retrying read (%d).\n", tries);
1074 msleep(ETP_READ_BACK_DELAY);
1075 } while (tries > 0);
1076
1077 if (rc) {
1078 psmouse_err(psmouse,
1079 "failed to read back register 0x10.\n");
1080 } else if (etd->info.hw_version == 1 &&
1081 !(val & ETP_R10_ABSOLUTE_MODE)) {
1082 psmouse_err(psmouse,
1083 "touchpad refuses to switch to absolute mode.\n");
1084 rc = -1;
1085 }
1086 }
1087
1088 skip_readback_reg_10:
1089 if (rc)
1090 psmouse_err(psmouse, "failed to initialise registers.\n");
1091
1092 return rc;
1093}
1094
1095/*
1096 * (value from firmware) * 10 + 790 = dpi
1097 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
1098 */
1099static unsigned int elantech_convert_res(unsigned int val)
1100{
1101 return (val * 10 + 790) * 10 / 254;
1102}
1103
1104static int elantech_get_resolution_v4(struct psmouse *psmouse,
1105 unsigned int *x_res,
1106 unsigned int *y_res,
1107 unsigned int *bus)
1108{
1109 unsigned char param[3];
1110
1111 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
1112 return -1;
1113
1114 *x_res = elantech_convert_res(param[1] & 0x0f);
1115 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
1116 *bus = param[2];
1117
1118 return 0;
1119}
1120
1121static void elantech_set_buttonpad_prop(struct psmouse *psmouse)
1122{
1123 struct input_dev *dev = psmouse->dev;
1124 struct elantech_data *etd = psmouse->private;
1125
1126 if (elantech_is_buttonpad(&etd->info)) {
1127 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1128 __clear_bit(BTN_RIGHT, dev->keybit);
1129 }
1130}
1131
1132/*
1133 * Some hw_version 4 models do have a middle button
1134 */
1135static const struct dmi_system_id elantech_dmi_has_middle_button[] = {
1136#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1137 {
1138 /* Fujitsu H730 has a middle button */
1139 .matches = {
1140 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1141 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1142 },
1143 },
1144 {
1145 /* Fujitsu H760 also has a middle button */
1146 .matches = {
1147 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1148 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1149 },
1150 },
1151 {
1152 /* Fujitsu H780 also has a middle button */
1153 .matches = {
1154 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1155 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H780"),
1156 },
1157 },
1158#endif
1159 { }
1160};
1161
1162/*
1163 * Set the appropriate event bits for the input subsystem
1164 */
1165static int elantech_set_input_params(struct psmouse *psmouse)
1166{
1167 struct input_dev *dev = psmouse->dev;
1168 struct elantech_data *etd = psmouse->private;
1169 struct elantech_device_info *info = &etd->info;
1170 unsigned int x_min = info->x_min, y_min = info->y_min,
1171 x_max = info->x_max, y_max = info->y_max,
1172 width = info->width;
1173
1174 __set_bit(INPUT_PROP_POINTER, dev->propbit);
1175 __set_bit(EV_KEY, dev->evbit);
1176 __set_bit(EV_ABS, dev->evbit);
1177 __clear_bit(EV_REL, dev->evbit);
1178
1179 __set_bit(BTN_LEFT, dev->keybit);
1180 if (info->has_middle_button)
1181 __set_bit(BTN_MIDDLE, dev->keybit);
1182 __set_bit(BTN_RIGHT, dev->keybit);
1183
1184 __set_bit(BTN_TOUCH, dev->keybit);
1185 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1186 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1187 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1188
1189 switch (info->hw_version) {
1190 case 1:
1191 /* Rocker button */
1192 if (info->fw_version < 0x020000 &&
1193 (info->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
1194 __set_bit(BTN_FORWARD, dev->keybit);
1195 __set_bit(BTN_BACK, dev->keybit);
1196 }
1197 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1198 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1199 break;
1200
1201 case 2:
1202 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1203 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1204 fallthrough;
1205 case 3:
1206 if (info->hw_version == 3)
1207 elantech_set_buttonpad_prop(psmouse);
1208 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1209 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1210 if (info->reports_pressure) {
1211 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1212 ETP_PMAX_V2, 0, 0);
1213 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1214 ETP_WMAX_V2, 0, 0);
1215 }
1216 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT);
1217 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1218 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1219 break;
1220
1221 case 4:
1222 elantech_set_buttonpad_prop(psmouse);
1223 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1224 /* For X to recognize me as touchpad. */
1225 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1226 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1227 /*
1228 * range of pressure and width is the same as v2,
1229 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1230 */
1231 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1232 ETP_PMAX_V2, 0, 0);
1233 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1234 ETP_WMAX_V2, 0, 0);
1235 /* Multitouch capable pad, up to 5 fingers. */
1236 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1237 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1238 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1239 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1240 ETP_PMAX_V2, 0, 0);
1241 /*
1242 * The firmware reports how many trace lines the finger spans,
1243 * convert to surface unit as Protocol-B requires.
1244 */
1245 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1246 ETP_WMAX_V2 * width, 0, 0);
1247 break;
1248 }
1249
1250 input_abs_set_res(dev, ABS_X, info->x_res);
1251 input_abs_set_res(dev, ABS_Y, info->y_res);
1252 if (info->hw_version > 1) {
1253 input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res);
1254 input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res);
1255 }
1256
1257 etd->y_max = y_max;
1258 etd->width = width;
1259
1260 return 0;
1261}
1262
1263struct elantech_attr_data {
1264 size_t field_offset;
1265 unsigned char reg;
1266};
1267
1268/*
1269 * Display a register value by reading a sysfs entry
1270 */
1271static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1272 char *buf)
1273{
1274 struct elantech_data *etd = psmouse->private;
1275 struct elantech_attr_data *attr = data;
1276 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1277 int rc = 0;
1278
1279 if (attr->reg)
1280 rc = elantech_read_reg(psmouse, attr->reg, reg);
1281
1282 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1283}
1284
1285/*
1286 * Write a register value by writing a sysfs entry
1287 */
1288static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1289 void *data, const char *buf, size_t count)
1290{
1291 struct elantech_data *etd = psmouse->private;
1292 struct elantech_attr_data *attr = data;
1293 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1294 unsigned char value;
1295 int err;
1296
1297 err = kstrtou8(buf, 16, &value);
1298 if (err)
1299 return err;
1300
1301 /* Do we need to preserve some bits for version 2 hardware too? */
1302 if (etd->info.hw_version == 1) {
1303 if (attr->reg == 0x10)
1304 /* Force absolute mode always on */
1305 value |= ETP_R10_ABSOLUTE_MODE;
1306 else if (attr->reg == 0x11)
1307 /* Force 4 byte mode always on */
1308 value |= ETP_R11_4_BYTE_MODE;
1309 }
1310
1311 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1312 *reg = value;
1313
1314 return count;
1315}
1316
1317#define ELANTECH_INT_ATTR(_name, _register) \
1318 static struct elantech_attr_data elantech_attr_##_name = { \
1319 .field_offset = offsetof(struct elantech_data, _name), \
1320 .reg = _register, \
1321 }; \
1322 PSMOUSE_DEFINE_ATTR(_name, 0644, \
1323 &elantech_attr_##_name, \
1324 elantech_show_int_attr, \
1325 elantech_set_int_attr)
1326
1327#define ELANTECH_INFO_ATTR(_name) \
1328 static struct elantech_attr_data elantech_attr_##_name = { \
1329 .field_offset = offsetof(struct elantech_data, info) + \
1330 offsetof(struct elantech_device_info, _name), \
1331 .reg = 0, \
1332 }; \
1333 PSMOUSE_DEFINE_ATTR(_name, 0644, \
1334 &elantech_attr_##_name, \
1335 elantech_show_int_attr, \
1336 elantech_set_int_attr)
1337
1338ELANTECH_INT_ATTR(reg_07, 0x07);
1339ELANTECH_INT_ATTR(reg_10, 0x10);
1340ELANTECH_INT_ATTR(reg_11, 0x11);
1341ELANTECH_INT_ATTR(reg_20, 0x20);
1342ELANTECH_INT_ATTR(reg_21, 0x21);
1343ELANTECH_INT_ATTR(reg_22, 0x22);
1344ELANTECH_INT_ATTR(reg_23, 0x23);
1345ELANTECH_INT_ATTR(reg_24, 0x24);
1346ELANTECH_INT_ATTR(reg_25, 0x25);
1347ELANTECH_INT_ATTR(reg_26, 0x26);
1348ELANTECH_INFO_ATTR(debug);
1349ELANTECH_INFO_ATTR(paritycheck);
1350ELANTECH_INFO_ATTR(crc_enabled);
1351
1352static struct attribute *elantech_attrs[] = {
1353 &psmouse_attr_reg_07.dattr.attr,
1354 &psmouse_attr_reg_10.dattr.attr,
1355 &psmouse_attr_reg_11.dattr.attr,
1356 &psmouse_attr_reg_20.dattr.attr,
1357 &psmouse_attr_reg_21.dattr.attr,
1358 &psmouse_attr_reg_22.dattr.attr,
1359 &psmouse_attr_reg_23.dattr.attr,
1360 &psmouse_attr_reg_24.dattr.attr,
1361 &psmouse_attr_reg_25.dattr.attr,
1362 &psmouse_attr_reg_26.dattr.attr,
1363 &psmouse_attr_debug.dattr.attr,
1364 &psmouse_attr_paritycheck.dattr.attr,
1365 &psmouse_attr_crc_enabled.dattr.attr,
1366 NULL
1367};
1368
1369static const struct attribute_group elantech_attr_group = {
1370 .attrs = elantech_attrs,
1371};
1372
1373static bool elantech_is_signature_valid(const unsigned char *param)
1374{
1375 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1376 int i;
1377
1378 if (param[0] == 0)
1379 return false;
1380
1381 if (param[1] == 0)
1382 return true;
1383
1384 /*
1385 * Some hw_version >= 4 models have a revision higher then 20. Meaning
1386 * that param[2] may be 10 or 20, skip the rates check for these.
1387 */
1388 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f &&
1389 param[2] < 40)
1390 return true;
1391
1392 for (i = 0; i < ARRAY_SIZE(rates); i++)
1393 if (param[2] == rates[i])
1394 return false;
1395
1396 return true;
1397}
1398
1399/*
1400 * Use magic knock to detect Elantech touchpad
1401 */
1402int elantech_detect(struct psmouse *psmouse, bool set_properties)
1403{
1404 struct ps2dev *ps2dev = &psmouse->ps2dev;
1405 unsigned char param[3];
1406
1407 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1408
1409 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1410 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1411 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1412 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1413 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1414 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1415 return -1;
1416 }
1417
1418 /*
1419 * Report this in case there are Elantech models that use a different
1420 * set of magic numbers
1421 */
1422 if (param[0] != 0x3c || param[1] != 0x03 ||
1423 (param[2] != 0xc8 && param[2] != 0x00)) {
1424 psmouse_dbg(psmouse,
1425 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1426 param[0], param[1], param[2]);
1427 return -1;
1428 }
1429
1430 /*
1431 * Query touchpad's firmware version and see if it reports known
1432 * value to avoid mis-detection. Logitech mice are known to respond
1433 * to Elantech magic knock and there might be more.
1434 */
1435 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1436 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1437 return -1;
1438 }
1439
1440 psmouse_dbg(psmouse,
1441 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1442 param[0], param[1], param[2]);
1443
1444 if (!elantech_is_signature_valid(param)) {
1445 psmouse_dbg(psmouse,
1446 "Probably not a real Elantech touchpad. Aborting.\n");
1447 return -1;
1448 }
1449
1450 if (set_properties) {
1451 psmouse->vendor = "Elantech";
1452 psmouse->name = "Touchpad";
1453 }
1454
1455 return 0;
1456}
1457
1458/*
1459 * Clean up sysfs entries when disconnecting
1460 */
1461static void elantech_disconnect(struct psmouse *psmouse)
1462{
1463 struct elantech_data *etd = psmouse->private;
1464
1465 /*
1466 * We might have left a breadcrumb when trying to
1467 * set up SMbus companion.
1468 */
1469 psmouse_smbus_cleanup(psmouse);
1470
1471 if (etd->tp_dev)
1472 input_unregister_device(etd->tp_dev);
1473 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1474 &elantech_attr_group);
1475 kfree(psmouse->private);
1476 psmouse->private = NULL;
1477}
1478
1479/*
1480 * Put the touchpad back into absolute mode when reconnecting
1481 */
1482static int elantech_reconnect(struct psmouse *psmouse)
1483{
1484 psmouse_reset(psmouse);
1485
1486 if (elantech_detect(psmouse, 0))
1487 return -1;
1488
1489 if (elantech_set_absolute_mode(psmouse)) {
1490 psmouse_err(psmouse,
1491 "failed to put touchpad back into absolute mode.\n");
1492 return -1;
1493 }
1494
1495 return 0;
1496}
1497
1498/*
1499 * Some hw_version 4 models do not work with crc_disabled
1500 */
1501static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
1502#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1503 {
1504 /* Fujitsu H730 does not work with crc_enabled == 0 */
1505 .matches = {
1506 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1507 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1508 },
1509 },
1510 {
1511 /* Fujitsu H760 does not work with crc_enabled == 0 */
1512 .matches = {
1513 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1514 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1515 },
1516 },
1517 {
1518 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */
1519 .matches = {
1520 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1521 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
1522 },
1523 },
1524 {
1525 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */
1526 .matches = {
1527 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1528 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"),
1529 },
1530 },
1531 {
1532 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */
1533 .matches = {
1534 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1535 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"),
1536 },
1537 },
1538 {
1539 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */
1540 .matches = {
1541 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1542 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"),
1543 },
1544 },
1545 {
1546 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */
1547 .matches = {
1548 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1549 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"),
1550 },
1551 },
1552 {
1553 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */
1554 .matches = {
1555 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1556 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"),
1557 },
1558 },
1559 {
1560 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
1561 .matches = {
1562 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1563 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
1564 },
1565 },
1566#endif
1567 { }
1568};
1569
1570/*
1571 * Some hw_version 3 models go into error state when we try to set
1572 * bit 3 and/or bit 1 of r10.
1573 */
1574static const struct dmi_system_id no_hw_res_dmi_table[] = {
1575#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1576 {
1577 /* Gigabyte U2442 */
1578 .matches = {
1579 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1580 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1581 },
1582 },
1583#endif
1584 { }
1585};
1586
1587/*
1588 * Change Report id 0x5E to 0x5F.
1589 */
1590static int elantech_change_report_id(struct psmouse *psmouse)
1591{
1592 /*
1593 * NOTE: the code is expecting to receive param[] as an array of 3
1594 * items (see __ps2_command()), even if in this case only 2 are
1595 * actually needed. Make sure the array size is 3 to avoid potential
1596 * stack out-of-bound accesses.
1597 */
1598 unsigned char param[3] = { 0x10, 0x03 };
1599
1600 if (elantech_write_reg_params(psmouse, 0x7, param) ||
1601 elantech_read_reg_params(psmouse, 0x7, param) ||
1602 param[0] != 0x10 || param[1] != 0x03) {
1603 psmouse_err(psmouse, "Unable to change report ID to 0x5f.\n");
1604 return -EIO;
1605 }
1606
1607 return 0;
1608}
1609/*
1610 * determine hardware version and set some properties according to it.
1611 */
1612static int elantech_set_properties(struct elantech_device_info *info)
1613{
1614 /* This represents the version of IC body. */
1615 info->ic_version = (info->fw_version & 0x0f0000) >> 16;
1616
1617 /* Early version of Elan touchpads doesn't obey the rule. */
1618 if (info->fw_version < 0x020030 || info->fw_version == 0x020600)
1619 info->hw_version = 1;
1620 else {
1621 switch (info->ic_version) {
1622 case 2:
1623 case 4:
1624 info->hw_version = 2;
1625 break;
1626 case 5:
1627 info->hw_version = 3;
1628 break;
1629 case 6 ... 15:
1630 info->hw_version = 4;
1631 break;
1632 default:
1633 return -1;
1634 }
1635 }
1636
1637 /* Get information pattern for hw_version 4 */
1638 info->pattern = 0x00;
1639 if (info->ic_version == 0x0f && (info->fw_version & 0xff) <= 0x02)
1640 info->pattern = info->fw_version & 0xff;
1641
1642 /* decide which send_cmd we're gonna use early */
1643 info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd :
1644 synaptics_send_cmd;
1645
1646 /* Turn on packet checking by default */
1647 info->paritycheck = 1;
1648
1649 /*
1650 * This firmware suffers from misreporting coordinates when
1651 * a touch action starts causing the mouse cursor or scrolled page
1652 * to jump. Enable a workaround.
1653 */
1654 info->jumpy_cursor =
1655 (info->fw_version == 0x020022 || info->fw_version == 0x020600);
1656
1657 if (info->hw_version > 1) {
1658 /* For now show extra debug information */
1659 info->debug = 1;
1660
1661 if (info->fw_version >= 0x020800)
1662 info->reports_pressure = true;
1663 }
1664
1665 /*
1666 * The signatures of v3 and v4 packets change depending on the
1667 * value of this hardware flag.
1668 */
1669 info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 ||
1670 dmi_check_system(elantech_dmi_force_crc_enabled);
1671
1672 /* Enable real hardware resolution on hw_version 3 ? */
1673 info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1674
1675 return 0;
1676}
1677
1678static int elantech_query_info(struct psmouse *psmouse,
1679 struct elantech_device_info *info)
1680{
1681 unsigned char param[3];
1682 unsigned char traces;
1683 unsigned char ic_body[3];
1684
1685 memset(info, 0, sizeof(*info));
1686
1687 /*
1688 * Do the version query again so we can store the result
1689 */
1690 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1691 psmouse_err(psmouse, "failed to query firmware version.\n");
1692 return -EINVAL;
1693 }
1694 info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1695
1696 if (elantech_set_properties(info)) {
1697 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1698 return -EINVAL;
1699 }
1700 psmouse_info(psmouse,
1701 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1702 info->hw_version, param[0], param[1], param[2]);
1703
1704 if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1705 info->capabilities)) {
1706 psmouse_err(psmouse, "failed to query capabilities.\n");
1707 return -EINVAL;
1708 }
1709 psmouse_info(psmouse,
1710 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1711 info->capabilities[0], info->capabilities[1],
1712 info->capabilities[2]);
1713
1714 if (info->hw_version != 1) {
1715 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) {
1716 psmouse_err(psmouse, "failed to query sample data\n");
1717 return -EINVAL;
1718 }
1719 psmouse_info(psmouse,
1720 "Elan sample query result %02x, %02x, %02x\n",
1721 info->samples[0],
1722 info->samples[1],
1723 info->samples[2]);
1724 }
1725
1726 if (info->pattern > 0x00 && info->ic_version == 0xf) {
1727 if (info->send_cmd(psmouse, ETP_ICBODY_QUERY, ic_body)) {
1728 psmouse_err(psmouse, "failed to query ic body\n");
1729 return -EINVAL;
1730 }
1731 info->ic_version = be16_to_cpup((__be16 *)ic_body);
1732 psmouse_info(psmouse,
1733 "Elan ic body: %#04x, current fw version: %#02x\n",
1734 info->ic_version, ic_body[2]);
1735 }
1736
1737 info->product_id = be16_to_cpup((__be16 *)info->samples);
1738 if (info->pattern == 0x00)
1739 info->product_id &= 0xff;
1740
1741 if (info->samples[1] == 0x74 && info->hw_version == 0x03) {
1742 /*
1743 * This module has a bug which makes absolute mode
1744 * unusable, so let's abort so we'll be using standard
1745 * PS/2 protocol.
1746 */
1747 psmouse_info(psmouse,
1748 "absolute mode broken, forcing standard PS/2 protocol\n");
1749 return -ENODEV;
1750 }
1751
1752 /* The MSB indicates the presence of the trackpoint */
1753 info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80;
1754
1755 if (info->has_trackpoint && info->ic_version == 0x0011 &&
1756 (info->product_id == 0x08 || info->product_id == 0x09 ||
1757 info->product_id == 0x0d || info->product_id == 0x0e)) {
1758 /*
1759 * This module has a bug which makes trackpoint in SMBus
1760 * mode return invalid data unless trackpoint is switched
1761 * from using 0x5e reports to 0x5f. If we are not able to
1762 * make the switch, let's abort initialization so we'll be
1763 * using standard PS/2 protocol.
1764 */
1765 if (elantech_change_report_id(psmouse)) {
1766 psmouse_info(psmouse,
1767 "Trackpoint report is broken, forcing standard PS/2 protocol\n");
1768 return -ENODEV;
1769 }
1770 }
1771
1772 info->x_res = 31;
1773 info->y_res = 31;
1774 if (info->hw_version == 4) {
1775 if (elantech_get_resolution_v4(psmouse,
1776 &info->x_res,
1777 &info->y_res,
1778 &info->bus)) {
1779 psmouse_warn(psmouse,
1780 "failed to query resolution data.\n");
1781 }
1782 }
1783
1784 /* query range information */
1785 switch (info->hw_version) {
1786 case 1:
1787 info->x_min = ETP_XMIN_V1;
1788 info->y_min = ETP_YMIN_V1;
1789 info->x_max = ETP_XMAX_V1;
1790 info->y_max = ETP_YMAX_V1;
1791 break;
1792
1793 case 2:
1794 if (info->fw_version == 0x020800 ||
1795 info->fw_version == 0x020b00 ||
1796 info->fw_version == 0x020030) {
1797 info->x_min = ETP_XMIN_V2;
1798 info->y_min = ETP_YMIN_V2;
1799 info->x_max = ETP_XMAX_V2;
1800 info->y_max = ETP_YMAX_V2;
1801 } else {
1802 int i;
1803 int fixed_dpi;
1804
1805 i = (info->fw_version > 0x020800 &&
1806 info->fw_version < 0x020900) ? 1 : 2;
1807
1808 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1809 return -EINVAL;
1810
1811 fixed_dpi = param[1] & 0x10;
1812
1813 if (((info->fw_version >> 16) == 0x14) && fixed_dpi) {
1814 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
1815 return -EINVAL;
1816
1817 info->x_max = (info->capabilities[1] - i) * param[1] / 2;
1818 info->y_max = (info->capabilities[2] - i) * param[2] / 2;
1819 } else if (info->fw_version == 0x040216) {
1820 info->x_max = 819;
1821 info->y_max = 405;
1822 } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) {
1823 info->x_max = 900;
1824 info->y_max = 500;
1825 } else {
1826 info->x_max = (info->capabilities[1] - i) * 64;
1827 info->y_max = (info->capabilities[2] - i) * 64;
1828 }
1829 }
1830 break;
1831
1832 case 3:
1833 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1834 return -EINVAL;
1835
1836 info->x_max = (0x0f & param[0]) << 8 | param[1];
1837 info->y_max = (0xf0 & param[0]) << 4 | param[2];
1838 break;
1839
1840 case 4:
1841 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1842 return -EINVAL;
1843
1844 info->x_max = (0x0f & param[0]) << 8 | param[1];
1845 info->y_max = (0xf0 & param[0]) << 4 | param[2];
1846 traces = info->capabilities[1];
1847 if ((traces < 2) || (traces > info->x_max))
1848 return -EINVAL;
1849
1850 info->width = info->x_max / (traces - 1);
1851
1852 /* column number of traces */
1853 info->x_traces = traces;
1854
1855 /* row number of traces */
1856 traces = info->capabilities[2];
1857 if ((traces >= 2) && (traces <= info->y_max))
1858 info->y_traces = traces;
1859
1860 break;
1861 }
1862
1863 /* check for the middle button: DMI matching or new v4 firmwares */
1864 info->has_middle_button = dmi_check_system(elantech_dmi_has_middle_button) ||
1865 (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) &&
1866 !elantech_is_buttonpad(info));
1867
1868 return 0;
1869}
1870
1871#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
1872
1873/*
1874 * The newest Elantech device can use a secondary bus (over SMBus) which
1875 * provides a better bandwidth and allow a better control of the touchpads.
1876 * This is used to decide if we need to use this bus or not.
1877 */
1878enum {
1879 ELANTECH_SMBUS_NOT_SET = -1,
1880 ELANTECH_SMBUS_OFF,
1881 ELANTECH_SMBUS_ON,
1882};
1883
1884static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ?
1885 ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF;
1886module_param_named(elantech_smbus, elantech_smbus, int, 0644);
1887MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device.");
1888
1889static const char * const i2c_blacklist_pnp_ids[] = {
1890 /*
1891 * These are known to not be working properly as bits are missing
1892 * in elan_i2c.
1893 */
1894 NULL
1895};
1896
1897static int elantech_create_smbus(struct psmouse *psmouse,
1898 struct elantech_device_info *info,
1899 bool leave_breadcrumbs)
1900{
1901 struct property_entry i2c_props[11] = {};
1902 struct i2c_board_info smbus_board = {
1903 I2C_BOARD_INFO("elan_i2c", 0x15),
1904 .flags = I2C_CLIENT_HOST_NOTIFY,
1905 };
1906 unsigned int idx = 0;
1907
1908 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-x",
1909 info->x_max + 1);
1910 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-y",
1911 info->y_max + 1);
1912 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-x",
1913 info->x_min);
1914 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-y",
1915 info->y_min);
1916 if (info->x_res)
1917 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-x-mm",
1918 (info->x_max + 1) / info->x_res);
1919 if (info->y_res)
1920 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-y-mm",
1921 (info->y_max + 1) / info->y_res);
1922
1923 if (info->has_trackpoint)
1924 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,trackpoint");
1925
1926 if (info->has_middle_button)
1927 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,middle-button");
1928
1929 if (info->x_traces)
1930 i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,x_traces",
1931 info->x_traces);
1932 if (info->y_traces)
1933 i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,y_traces",
1934 info->y_traces);
1935
1936 if (elantech_is_buttonpad(info))
1937 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,clickpad");
1938
1939 smbus_board.fwnode = fwnode_create_software_node(i2c_props, NULL);
1940 if (IS_ERR(smbus_board.fwnode))
1941 return PTR_ERR(smbus_board.fwnode);
1942
1943 return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false,
1944 leave_breadcrumbs);
1945}
1946
1947/*
1948 * elantech_setup_smbus - called once the PS/2 devices are enumerated
1949 * and decides to instantiate a SMBus InterTouch device.
1950 */
1951static int elantech_setup_smbus(struct psmouse *psmouse,
1952 struct elantech_device_info *info,
1953 bool leave_breadcrumbs)
1954{
1955 int error;
1956
1957 if (elantech_smbus == ELANTECH_SMBUS_OFF)
1958 return -ENXIO;
1959
1960 if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) {
1961 /*
1962 * New ICs are enabled by default, unless mentioned in
1963 * i2c_blacklist_pnp_ids.
1964 * Old ICs are up to the user to decide.
1965 */
1966 if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) ||
1967 psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids))
1968 return -ENXIO;
1969 }
1970
1971 psmouse_info(psmouse, "Trying to set up SMBus access\n");
1972
1973 error = elantech_create_smbus(psmouse, info, leave_breadcrumbs);
1974 if (error) {
1975 if (error == -EAGAIN)
1976 psmouse_info(psmouse, "SMbus companion is not ready yet\n");
1977 else
1978 psmouse_err(psmouse, "unable to create intertouch device\n");
1979
1980 return error;
1981 }
1982
1983 return 0;
1984}
1985
1986static bool elantech_use_host_notify(struct psmouse *psmouse,
1987 struct elantech_device_info *info)
1988{
1989 if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version))
1990 return true;
1991
1992 switch (info->bus) {
1993 case ETP_BUS_PS2_ONLY:
1994 /* expected case */
1995 break;
1996 case ETP_BUS_SMB_ALERT_ONLY:
1997 case ETP_BUS_PS2_SMB_ALERT:
1998 psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n");
1999 break;
2000 case ETP_BUS_SMB_HST_NTFY_ONLY:
2001 case ETP_BUS_PS2_SMB_HST_NTFY:
2002 return true;
2003 default:
2004 psmouse_dbg(psmouse,
2005 "Ignoring SMBus bus provider %d.\n",
2006 info->bus);
2007 }
2008
2009 return false;
2010}
2011
2012int elantech_init_smbus(struct psmouse *psmouse)
2013{
2014 struct elantech_device_info info;
2015 int error;
2016
2017 psmouse_reset(psmouse);
2018
2019 error = elantech_query_info(psmouse, &info);
2020 if (error)
2021 goto init_fail;
2022
2023 if (info.hw_version < 4) {
2024 error = -ENXIO;
2025 goto init_fail;
2026 }
2027
2028 return elantech_create_smbus(psmouse, &info, false);
2029 init_fail:
2030 psmouse_reset(psmouse);
2031 return error;
2032}
2033#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
2034
2035/*
2036 * Initialize the touchpad and create sysfs entries
2037 */
2038static int elantech_setup_ps2(struct psmouse *psmouse,
2039 struct elantech_device_info *info)
2040{
2041 struct elantech_data *etd;
2042 int i;
2043 int error = -EINVAL;
2044 struct input_dev *tp_dev;
2045
2046 psmouse->private = etd = kzalloc(sizeof(*etd), GFP_KERNEL);
2047 if (!etd)
2048 return -ENOMEM;
2049
2050 etd->info = *info;
2051
2052 etd->parity[0] = 1;
2053 for (i = 1; i < 256; i++)
2054 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
2055
2056 if (elantech_set_absolute_mode(psmouse)) {
2057 psmouse_err(psmouse,
2058 "failed to put touchpad into absolute mode.\n");
2059 goto init_fail;
2060 }
2061
2062 if (info->fw_version == 0x381f17) {
2063 etd->original_set_rate = psmouse->set_rate;
2064 psmouse->set_rate = elantech_set_rate_restore_reg_07;
2065 }
2066
2067 if (elantech_set_input_params(psmouse)) {
2068 psmouse_err(psmouse, "failed to query touchpad range.\n");
2069 goto init_fail;
2070 }
2071
2072 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
2073 &elantech_attr_group);
2074 if (error) {
2075 psmouse_err(psmouse,
2076 "failed to create sysfs attributes, error: %d.\n",
2077 error);
2078 goto init_fail;
2079 }
2080
2081 if (info->has_trackpoint) {
2082 tp_dev = input_allocate_device();
2083
2084 if (!tp_dev) {
2085 error = -ENOMEM;
2086 goto init_fail_tp_alloc;
2087 }
2088
2089 etd->tp_dev = tp_dev;
2090 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
2091 psmouse->ps2dev.serio->phys);
2092 tp_dev->phys = etd->tp_phys;
2093 tp_dev->name = "ETPS/2 Elantech TrackPoint";
2094 tp_dev->id.bustype = BUS_I8042;
2095 tp_dev->id.vendor = 0x0002;
2096 tp_dev->id.product = PSMOUSE_ELANTECH;
2097 tp_dev->id.version = 0x0000;
2098 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev;
2099 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
2100 tp_dev->relbit[BIT_WORD(REL_X)] =
2101 BIT_MASK(REL_X) | BIT_MASK(REL_Y);
2102 tp_dev->keybit[BIT_WORD(BTN_LEFT)] =
2103 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
2104 BIT_MASK(BTN_RIGHT);
2105
2106 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit);
2107 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit);
2108
2109 error = input_register_device(etd->tp_dev);
2110 if (error < 0)
2111 goto init_fail_tp_reg;
2112 }
2113
2114 psmouse->protocol_handler = elantech_process_byte;
2115 psmouse->disconnect = elantech_disconnect;
2116 psmouse->reconnect = elantech_reconnect;
2117 psmouse->fast_reconnect = NULL;
2118 psmouse->pktsize = info->hw_version > 1 ? 6 : 4;
2119
2120 return 0;
2121 init_fail_tp_reg:
2122 input_free_device(tp_dev);
2123 init_fail_tp_alloc:
2124 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
2125 &elantech_attr_group);
2126 init_fail:
2127 kfree(etd);
2128 return error;
2129}
2130
2131int elantech_init_ps2(struct psmouse *psmouse)
2132{
2133 struct elantech_device_info info;
2134 int error;
2135
2136 psmouse_reset(psmouse);
2137
2138 error = elantech_query_info(psmouse, &info);
2139 if (error)
2140 goto init_fail;
2141
2142 error = elantech_setup_ps2(psmouse, &info);
2143 if (error)
2144 goto init_fail;
2145
2146 return 0;
2147 init_fail:
2148 psmouse_reset(psmouse);
2149 return error;
2150}
2151
2152int elantech_init(struct psmouse *psmouse)
2153{
2154 struct elantech_device_info info;
2155 int error;
2156
2157 psmouse_reset(psmouse);
2158
2159 error = elantech_query_info(psmouse, &info);
2160 if (error)
2161 goto init_fail;
2162
2163#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
2164
2165 if (elantech_use_host_notify(psmouse, &info)) {
2166 if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ||
2167 !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) {
2168 psmouse_warn(psmouse,
2169 "The touchpad can support a better bus than the too old PS/2 protocol. "
2170 "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n");
2171 }
2172 error = elantech_setup_smbus(psmouse, &info, true);
2173 if (!error)
2174 return PSMOUSE_ELANTECH_SMBUS;
2175 }
2176
2177#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
2178
2179 error = elantech_setup_ps2(psmouse, &info);
2180 if (error < 0) {
2181 /*
2182 * Not using any flavor of Elantech support, so clean up
2183 * SMbus breadcrumbs, if any.
2184 */
2185 psmouse_smbus_cleanup(psmouse);
2186 goto init_fail;
2187 }
2188
2189 return PSMOUSE_ELANTECH;
2190 init_fail:
2191 psmouse_reset(psmouse);
2192 return error;
2193}