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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/*
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 */
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 a value from a register
94 */
95static 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 (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_READ) ||
111 ps2_sliced_command(&psmouse->ps2dev, 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 */
151static 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 (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_WRITE) ||
166 ps2_sliced_command(&psmouse->ps2dev, reg) ||
167 ps2_sliced_command(&psmouse->ps2dev, 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 */
223static 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 */
233static 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
283 psmouse_report_standard_buttons(dev, packet[0]);
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
296static 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 */
308static 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 */
321static 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 psmouse_report_standard_buttons(dev, packet[0]);
394 if (etd->reports_pressure) {
395 input_report_abs(dev, ABS_PRESSURE, pres);
396 input_report_abs(dev, ABS_TOOL_WIDTH, width);
397 }
398
399 input_sync(dev);
400}
401
402static void elantech_report_trackpoint(struct psmouse *psmouse,
403 int packet_type)
404{
405 /*
406 * byte 0: 0 0 sx sy 0 M R L
407 * byte 1:~sx 0 0 0 0 0 0 0
408 * byte 2:~sy 0 0 0 0 0 0 0
409 * byte 3: 0 0 ~sy ~sx 0 1 1 0
410 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0
411 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
412 *
413 * x and y are written in two's complement spread
414 * over 9 bits with sx/sy the relative top bit and
415 * x7..x0 and y7..y0 the lower bits.
416 * The sign of y is opposite to what the input driver
417 * expects for a relative movement
418 */
419
420 struct elantech_data *etd = psmouse->private;
421 struct input_dev *tp_dev = etd->tp_dev;
422 unsigned char *packet = psmouse->packet;
423 int x, y;
424 u32 t;
425
426 t = get_unaligned_le32(&packet[0]);
427
428 switch (t & ~7U) {
429 case 0x06000030U:
430 case 0x16008020U:
431 case 0x26800010U:
432 case 0x36808000U:
433 x = packet[4] - (int)((packet[1]^0x80) << 1);
434 y = (int)((packet[2]^0x80) << 1) - packet[5];
435
436 psmouse_report_standard_buttons(tp_dev, packet[0]);
437
438 input_report_rel(tp_dev, REL_X, x);
439 input_report_rel(tp_dev, REL_Y, y);
440
441 input_sync(tp_dev);
442
443 break;
444
445 default:
446 /* Dump unexpected packet sequences if debug=1 (default) */
447 if (etd->debug == 1)
448 elantech_packet_dump(psmouse);
449
450 break;
451 }
452}
453
454/*
455 * Interpret complete data packets and report absolute mode input events for
456 * hardware version 3. (12 byte packets for two fingers)
457 */
458static void elantech_report_absolute_v3(struct psmouse *psmouse,
459 int packet_type)
460{
461 struct input_dev *dev = psmouse->dev;
462 struct elantech_data *etd = psmouse->private;
463 unsigned char *packet = psmouse->packet;
464 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
465 unsigned int width = 0, pres = 0;
466
467 /* byte 0: n1 n0 . . . . R L */
468 fingers = (packet[0] & 0xc0) >> 6;
469
470 switch (fingers) {
471 case 3:
472 case 1:
473 /*
474 * byte 1: . . . . x11 x10 x9 x8
475 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
476 */
477 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
478 /*
479 * byte 4: . . . . y11 y10 y9 y8
480 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
481 */
482 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
483 break;
484
485 case 2:
486 if (packet_type == PACKET_V3_HEAD) {
487 /*
488 * byte 1: . . . . ax11 ax10 ax9 ax8
489 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
490 */
491 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
492 /*
493 * byte 4: . . . . ay11 ay10 ay9 ay8
494 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
495 */
496 etd->mt[0].y = etd->y_max -
497 (((packet[4] & 0x0f) << 8) | packet[5]);
498 /*
499 * wait for next packet
500 */
501 return;
502 }
503
504 /* packet_type == PACKET_V3_TAIL */
505 x1 = etd->mt[0].x;
506 y1 = etd->mt[0].y;
507 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
508 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
509 break;
510 }
511
512 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
513 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
514
515 input_report_key(dev, BTN_TOUCH, fingers != 0);
516 if (fingers != 0) {
517 input_report_abs(dev, ABS_X, x1);
518 input_report_abs(dev, ABS_Y, y1);
519 }
520 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
521 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
522 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
523 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
524
525 /* For clickpads map both buttons to BTN_LEFT */
526 if (etd->fw_version & 0x001000)
527 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
528 else
529 psmouse_report_standard_buttons(dev, packet[0]);
530
531 input_report_abs(dev, ABS_PRESSURE, pres);
532 input_report_abs(dev, ABS_TOOL_WIDTH, width);
533
534 input_sync(dev);
535}
536
537static void elantech_input_sync_v4(struct psmouse *psmouse)
538{
539 struct input_dev *dev = psmouse->dev;
540 struct elantech_data *etd = psmouse->private;
541 unsigned char *packet = psmouse->packet;
542
543 /* For clickpads map both buttons to BTN_LEFT */
544 if (etd->fw_version & 0x001000)
545 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
546 else
547 psmouse_report_standard_buttons(dev, packet[0]);
548
549 input_mt_report_pointer_emulation(dev, true);
550 input_sync(dev);
551}
552
553static void process_packet_status_v4(struct psmouse *psmouse)
554{
555 struct input_dev *dev = psmouse->dev;
556 unsigned char *packet = psmouse->packet;
557 unsigned fingers;
558 int i;
559
560 /* notify finger state change */
561 fingers = packet[1] & 0x1f;
562 for (i = 0; i < ETP_MAX_FINGERS; i++) {
563 if ((fingers & (1 << i)) == 0) {
564 input_mt_slot(dev, i);
565 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
566 }
567 }
568
569 elantech_input_sync_v4(psmouse);
570}
571
572static void process_packet_head_v4(struct psmouse *psmouse)
573{
574 struct input_dev *dev = psmouse->dev;
575 struct elantech_data *etd = psmouse->private;
576 unsigned char *packet = psmouse->packet;
577 int id = ((packet[3] & 0xe0) >> 5) - 1;
578 int pres, traces;
579
580 if (id < 0)
581 return;
582
583 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
584 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
585 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
586 traces = (packet[0] & 0xf0) >> 4;
587
588 input_mt_slot(dev, id);
589 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
590
591 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
592 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
593 input_report_abs(dev, ABS_MT_PRESSURE, pres);
594 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
595 /* report this for backwards compatibility */
596 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
597
598 elantech_input_sync_v4(psmouse);
599}
600
601static void process_packet_motion_v4(struct psmouse *psmouse)
602{
603 struct input_dev *dev = psmouse->dev;
604 struct elantech_data *etd = psmouse->private;
605 unsigned char *packet = psmouse->packet;
606 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
607 int id, sid;
608
609 id = ((packet[0] & 0xe0) >> 5) - 1;
610 if (id < 0)
611 return;
612
613 sid = ((packet[3] & 0xe0) >> 5) - 1;
614 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
615 /*
616 * Motion packets give us the delta of x, y values of specific fingers,
617 * but in two's complement. Let the compiler do the conversion for us.
618 * Also _enlarge_ the numbers to int, in case of overflow.
619 */
620 delta_x1 = (signed char)packet[1];
621 delta_y1 = (signed char)packet[2];
622 delta_x2 = (signed char)packet[4];
623 delta_y2 = (signed char)packet[5];
624
625 etd->mt[id].x += delta_x1 * weight;
626 etd->mt[id].y -= delta_y1 * weight;
627 input_mt_slot(dev, id);
628 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
629 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
630
631 if (sid >= 0) {
632 etd->mt[sid].x += delta_x2 * weight;
633 etd->mt[sid].y -= delta_y2 * weight;
634 input_mt_slot(dev, sid);
635 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
636 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
637 }
638
639 elantech_input_sync_v4(psmouse);
640}
641
642static void elantech_report_absolute_v4(struct psmouse *psmouse,
643 int packet_type)
644{
645 switch (packet_type) {
646 case PACKET_V4_STATUS:
647 process_packet_status_v4(psmouse);
648 break;
649
650 case PACKET_V4_HEAD:
651 process_packet_head_v4(psmouse);
652 break;
653
654 case PACKET_V4_MOTION:
655 process_packet_motion_v4(psmouse);
656 break;
657
658 case PACKET_UNKNOWN:
659 default:
660 /* impossible to get here */
661 break;
662 }
663}
664
665static int elantech_packet_check_v1(struct psmouse *psmouse)
666{
667 struct elantech_data *etd = psmouse->private;
668 unsigned char *packet = psmouse->packet;
669 unsigned char p1, p2, p3;
670
671 /* Parity bits are placed differently */
672 if (etd->fw_version < 0x020000) {
673 /* byte 0: D U p1 p2 1 p3 R L */
674 p1 = (packet[0] & 0x20) >> 5;
675 p2 = (packet[0] & 0x10) >> 4;
676 } else {
677 /* byte 0: n1 n0 p2 p1 1 p3 R L */
678 p1 = (packet[0] & 0x10) >> 4;
679 p2 = (packet[0] & 0x20) >> 5;
680 }
681
682 p3 = (packet[0] & 0x04) >> 2;
683
684 return etd->parity[packet[1]] == p1 &&
685 etd->parity[packet[2]] == p2 &&
686 etd->parity[packet[3]] == p3;
687}
688
689static int elantech_debounce_check_v2(struct psmouse *psmouse)
690{
691 /*
692 * When we encounter packet that matches this exactly, it means the
693 * hardware is in debounce status. Just ignore the whole packet.
694 */
695 static const u8 debounce_packet[] = {
696 0x84, 0xff, 0xff, 0x02, 0xff, 0xff
697 };
698 unsigned char *packet = psmouse->packet;
699
700 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
701}
702
703static int elantech_packet_check_v2(struct psmouse *psmouse)
704{
705 struct elantech_data *etd = psmouse->private;
706 unsigned char *packet = psmouse->packet;
707
708 /*
709 * V2 hardware has two flavors. Older ones that do not report pressure,
710 * and newer ones that reports pressure and width. With newer ones, all
711 * packets (1, 2, 3 finger touch) have the same constant bits. With
712 * older ones, 1/3 finger touch packets and 2 finger touch packets
713 * have different constant bits.
714 * With all three cases, if the constant bits are not exactly what I
715 * expected, I consider them invalid.
716 */
717 if (etd->reports_pressure)
718 return (packet[0] & 0x0c) == 0x04 &&
719 (packet[3] & 0x0f) == 0x02;
720
721 if ((packet[0] & 0xc0) == 0x80)
722 return (packet[0] & 0x0c) == 0x0c &&
723 (packet[3] & 0x0e) == 0x08;
724
725 return (packet[0] & 0x3c) == 0x3c &&
726 (packet[1] & 0xf0) == 0x00 &&
727 (packet[3] & 0x3e) == 0x38 &&
728 (packet[4] & 0xf0) == 0x00;
729}
730
731/*
732 * We check the constant bits to determine what packet type we get,
733 * so packet checking is mandatory for v3 and later hardware.
734 */
735static int elantech_packet_check_v3(struct psmouse *psmouse)
736{
737 struct elantech_data *etd = psmouse->private;
738 static const u8 debounce_packet[] = {
739 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff
740 };
741 unsigned char *packet = psmouse->packet;
742
743 /*
744 * check debounce first, it has the same signature in byte 0
745 * and byte 3 as PACKET_V3_HEAD.
746 */
747 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
748 return PACKET_DEBOUNCE;
749
750 /*
751 * If the hardware flag 'crc_enabled' is set the packets have
752 * different signatures.
753 */
754 if (etd->crc_enabled) {
755 if ((packet[3] & 0x09) == 0x08)
756 return PACKET_V3_HEAD;
757
758 if ((packet[3] & 0x09) == 0x09)
759 return PACKET_V3_TAIL;
760 } else {
761 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
762 return PACKET_V3_HEAD;
763
764 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
765 return PACKET_V3_TAIL;
766 if ((packet[3] & 0x0f) == 0x06)
767 return PACKET_TRACKPOINT;
768 }
769
770 return PACKET_UNKNOWN;
771}
772
773static int elantech_packet_check_v4(struct psmouse *psmouse)
774{
775 struct elantech_data *etd = psmouse->private;
776 unsigned char *packet = psmouse->packet;
777 unsigned char packet_type = packet[3] & 0x03;
778 unsigned int ic_version;
779 bool sanity_check;
780
781 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
782 return PACKET_TRACKPOINT;
783
784 /* This represents the version of IC body. */
785 ic_version = (etd->fw_version & 0x0f0000) >> 16;
786
787 /*
788 * Sanity check based on the constant bits of a packet.
789 * The constant bits change depending on the value of
790 * the hardware flag 'crc_enabled' and the version of
791 * the IC body, but are the same for every packet,
792 * regardless of the type.
793 */
794 if (etd->crc_enabled)
795 sanity_check = ((packet[3] & 0x08) == 0x00);
796 else if (ic_version == 7 && etd->samples[1] == 0x2A)
797 sanity_check = ((packet[3] & 0x1c) == 0x10);
798 else
799 sanity_check = ((packet[0] & 0x0c) == 0x04 &&
800 (packet[3] & 0x1c) == 0x10);
801
802 if (!sanity_check)
803 return PACKET_UNKNOWN;
804
805 switch (packet_type) {
806 case 0:
807 return PACKET_V4_STATUS;
808
809 case 1:
810 return PACKET_V4_HEAD;
811
812 case 2:
813 return PACKET_V4_MOTION;
814 }
815
816 return PACKET_UNKNOWN;
817}
818
819/*
820 * Process byte stream from mouse and handle complete packets
821 */
822static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
823{
824 struct elantech_data *etd = psmouse->private;
825 int packet_type;
826
827 if (psmouse->pktcnt < psmouse->pktsize)
828 return PSMOUSE_GOOD_DATA;
829
830 if (etd->debug > 1)
831 elantech_packet_dump(psmouse);
832
833 switch (etd->hw_version) {
834 case 1:
835 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
836 return PSMOUSE_BAD_DATA;
837
838 elantech_report_absolute_v1(psmouse);
839 break;
840
841 case 2:
842 /* ignore debounce */
843 if (elantech_debounce_check_v2(psmouse))
844 return PSMOUSE_FULL_PACKET;
845
846 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
847 return PSMOUSE_BAD_DATA;
848
849 elantech_report_absolute_v2(psmouse);
850 break;
851
852 case 3:
853 packet_type = elantech_packet_check_v3(psmouse);
854 switch (packet_type) {
855 case PACKET_UNKNOWN:
856 return PSMOUSE_BAD_DATA;
857
858 case PACKET_DEBOUNCE:
859 /* ignore debounce */
860 break;
861
862 case PACKET_TRACKPOINT:
863 elantech_report_trackpoint(psmouse, packet_type);
864 break;
865
866 default:
867 elantech_report_absolute_v3(psmouse, packet_type);
868 break;
869 }
870
871 break;
872
873 case 4:
874 packet_type = elantech_packet_check_v4(psmouse);
875 switch (packet_type) {
876 case PACKET_UNKNOWN:
877 return PSMOUSE_BAD_DATA;
878
879 case PACKET_TRACKPOINT:
880 elantech_report_trackpoint(psmouse, packet_type);
881 break;
882
883 default:
884 elantech_report_absolute_v4(psmouse, packet_type);
885 break;
886 }
887
888 break;
889 }
890
891 return PSMOUSE_FULL_PACKET;
892}
893
894/*
895 * This writes the reg_07 value again to the hardware at the end of every
896 * set_rate call because the register loses its value. reg_07 allows setting
897 * absolute mode on v4 hardware
898 */
899static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse,
900 unsigned int rate)
901{
902 struct elantech_data *etd = psmouse->private;
903
904 etd->original_set_rate(psmouse, rate);
905 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
906 psmouse_err(psmouse, "restoring reg_07 failed\n");
907}
908
909/*
910 * Put the touchpad into absolute mode
911 */
912static int elantech_set_absolute_mode(struct psmouse *psmouse)
913{
914 struct elantech_data *etd = psmouse->private;
915 unsigned char val;
916 int tries = ETP_READ_BACK_TRIES;
917 int rc = 0;
918
919 switch (etd->hw_version) {
920 case 1:
921 etd->reg_10 = 0x16;
922 etd->reg_11 = 0x8f;
923 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
924 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
925 rc = -1;
926 }
927 break;
928
929 case 2:
930 /* Windows driver values */
931 etd->reg_10 = 0x54;
932 etd->reg_11 = 0x88; /* 0x8a */
933 etd->reg_21 = 0x60; /* 0x00 */
934 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
935 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
936 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
937 rc = -1;
938 }
939 break;
940
941 case 3:
942 if (etd->set_hw_resolution)
943 etd->reg_10 = 0x0b;
944 else
945 etd->reg_10 = 0x01;
946
947 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
948 rc = -1;
949
950 break;
951
952 case 4:
953 etd->reg_07 = 0x01;
954 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
955 rc = -1;
956
957 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
958 }
959
960 if (rc == 0) {
961 /*
962 * Read back reg 0x10. For hardware version 1 we must make
963 * sure the absolute mode bit is set. For hardware version 2
964 * the touchpad is probably initializing and not ready until
965 * we read back the value we just wrote.
966 */
967 do {
968 rc = elantech_read_reg(psmouse, 0x10, &val);
969 if (rc == 0)
970 break;
971 tries--;
972 elantech_debug("retrying read (%d).\n", tries);
973 msleep(ETP_READ_BACK_DELAY);
974 } while (tries > 0);
975
976 if (rc) {
977 psmouse_err(psmouse,
978 "failed to read back register 0x10.\n");
979 } else if (etd->hw_version == 1 &&
980 !(val & ETP_R10_ABSOLUTE_MODE)) {
981 psmouse_err(psmouse,
982 "touchpad refuses to switch to absolute mode.\n");
983 rc = -1;
984 }
985 }
986
987 skip_readback_reg_10:
988 if (rc)
989 psmouse_err(psmouse, "failed to initialise registers.\n");
990
991 return rc;
992}
993
994static int elantech_set_range(struct psmouse *psmouse,
995 unsigned int *x_min, unsigned int *y_min,
996 unsigned int *x_max, unsigned int *y_max,
997 unsigned int *width)
998{
999 struct elantech_data *etd = psmouse->private;
1000 unsigned char param[3];
1001 unsigned char traces;
1002
1003 switch (etd->hw_version) {
1004 case 1:
1005 *x_min = ETP_XMIN_V1;
1006 *y_min = ETP_YMIN_V1;
1007 *x_max = ETP_XMAX_V1;
1008 *y_max = ETP_YMAX_V1;
1009 break;
1010
1011 case 2:
1012 if (etd->fw_version == 0x020800 ||
1013 etd->fw_version == 0x020b00 ||
1014 etd->fw_version == 0x020030) {
1015 *x_min = ETP_XMIN_V2;
1016 *y_min = ETP_YMIN_V2;
1017 *x_max = ETP_XMAX_V2;
1018 *y_max = ETP_YMAX_V2;
1019 } else {
1020 int i;
1021 int fixed_dpi;
1022
1023 i = (etd->fw_version > 0x020800 &&
1024 etd->fw_version < 0x020900) ? 1 : 2;
1025
1026 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1027 return -1;
1028
1029 fixed_dpi = param[1] & 0x10;
1030
1031 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
1032 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
1033 return -1;
1034
1035 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
1036 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
1037 } else if (etd->fw_version == 0x040216) {
1038 *x_max = 819;
1039 *y_max = 405;
1040 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
1041 *x_max = 900;
1042 *y_max = 500;
1043 } else {
1044 *x_max = (etd->capabilities[1] - i) * 64;
1045 *y_max = (etd->capabilities[2] - i) * 64;
1046 }
1047 }
1048 break;
1049
1050 case 3:
1051 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1052 return -1;
1053
1054 *x_max = (0x0f & param[0]) << 8 | param[1];
1055 *y_max = (0xf0 & param[0]) << 4 | param[2];
1056 break;
1057
1058 case 4:
1059 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1060 return -1;
1061
1062 *x_max = (0x0f & param[0]) << 8 | param[1];
1063 *y_max = (0xf0 & param[0]) << 4 | param[2];
1064 traces = etd->capabilities[1];
1065 if ((traces < 2) || (traces > *x_max))
1066 return -1;
1067
1068 *width = *x_max / (traces - 1);
1069 break;
1070 }
1071
1072 return 0;
1073}
1074
1075/*
1076 * (value from firmware) * 10 + 790 = dpi
1077 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
1078 */
1079static unsigned int elantech_convert_res(unsigned int val)
1080{
1081 return (val * 10 + 790) * 10 / 254;
1082}
1083
1084static int elantech_get_resolution_v4(struct psmouse *psmouse,
1085 unsigned int *x_res,
1086 unsigned int *y_res)
1087{
1088 unsigned char param[3];
1089
1090 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
1091 return -1;
1092
1093 *x_res = elantech_convert_res(param[1] & 0x0f);
1094 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
1095
1096 return 0;
1097}
1098
1099/*
1100 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
1101 * fw_version for this is based on the following fw_version & caps table:
1102 *
1103 * Laptop-model: fw_version: caps: buttons:
1104 * Acer S3 0x461f00 10, 13, 0e clickpad
1105 * Acer S7-392 0x581f01 50, 17, 0d clickpad
1106 * Acer V5-131 0x461f02 01, 16, 0c clickpad
1107 * Acer V5-551 0x461f00 ? clickpad
1108 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons
1109 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons
1110 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons
1111 * Asus TP500LN 0x381f17 10, 14, 0e clickpad
1112 * Asus X750JN 0x381f17 10, 14, 0e clickpad
1113 * Asus UX31 0x361f00 20, 15, 0e clickpad
1114 * Asus UX32VD 0x361f02 00, 15, 0e clickpad
1115 * Avatar AVIU-145A2 0x361f00 ? clickpad
1116 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons
1117 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons
1118 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons
1119 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons
1120 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons
1121 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons
1122 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**)
1123 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons
1124 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*)
1125 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*)
1126 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons
1127 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad
1128 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad
1129 * Samsung NP900X3E-A02 0x575f03 ? clickpad
1130 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad
1131 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons
1132 * Samsung RF710 0x450f00 ? 2 hw buttons
1133 * System76 Pangolin 0x250f01 ? 2 hw buttons
1134 * (*) + 3 trackpoint buttons
1135 * (**) + 0 trackpoint buttons
1136 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps
1137 */
1138static void elantech_set_buttonpad_prop(struct psmouse *psmouse)
1139{
1140 struct input_dev *dev = psmouse->dev;
1141 struct elantech_data *etd = psmouse->private;
1142
1143 if (etd->fw_version & 0x001000) {
1144 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1145 __clear_bit(BTN_RIGHT, dev->keybit);
1146 }
1147}
1148
1149/*
1150 * Some hw_version 4 models do have a middle button
1151 */
1152static const struct dmi_system_id elantech_dmi_has_middle_button[] = {
1153#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1154 {
1155 /* Fujitsu H730 has a middle button */
1156 .matches = {
1157 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1158 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1159 },
1160 },
1161 {
1162 /* Fujitsu H760 also has a middle button */
1163 .matches = {
1164 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1165 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1166 },
1167 },
1168#endif
1169 { }
1170};
1171
1172/*
1173 * Set the appropriate event bits for the input subsystem
1174 */
1175static int elantech_set_input_params(struct psmouse *psmouse)
1176{
1177 struct input_dev *dev = psmouse->dev;
1178 struct elantech_data *etd = psmouse->private;
1179 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
1180 unsigned int x_res = 31, y_res = 31;
1181
1182 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
1183 return -1;
1184
1185 __set_bit(INPUT_PROP_POINTER, dev->propbit);
1186 __set_bit(EV_KEY, dev->evbit);
1187 __set_bit(EV_ABS, dev->evbit);
1188 __clear_bit(EV_REL, dev->evbit);
1189
1190 __set_bit(BTN_LEFT, dev->keybit);
1191 if (dmi_check_system(elantech_dmi_has_middle_button))
1192 __set_bit(BTN_MIDDLE, dev->keybit);
1193 __set_bit(BTN_RIGHT, dev->keybit);
1194
1195 __set_bit(BTN_TOUCH, dev->keybit);
1196 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1197 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1198 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1199
1200 switch (etd->hw_version) {
1201 case 1:
1202 /* Rocker button */
1203 if (etd->fw_version < 0x020000 &&
1204 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
1205 __set_bit(BTN_FORWARD, dev->keybit);
1206 __set_bit(BTN_BACK, dev->keybit);
1207 }
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 break;
1211
1212 case 2:
1213 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1214 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1215 /* fall through */
1216 case 3:
1217 if (etd->hw_version == 3)
1218 elantech_set_buttonpad_prop(psmouse);
1219 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1220 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1221 if (etd->reports_pressure) {
1222 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1223 ETP_PMAX_V2, 0, 0);
1224 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1225 ETP_WMAX_V2, 0, 0);
1226 }
1227 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT);
1228 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1229 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1230 break;
1231
1232 case 4:
1233 if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
1234 /*
1235 * if query failed, print a warning and leave the values
1236 * zero to resemble synaptics.c behavior.
1237 */
1238 psmouse_warn(psmouse, "couldn't query resolution data.\n");
1239 }
1240 elantech_set_buttonpad_prop(psmouse);
1241 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1242 /* For X to recognize me as touchpad. */
1243 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1244 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1245 /*
1246 * range of pressure and width is the same as v2,
1247 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1248 */
1249 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1250 ETP_PMAX_V2, 0, 0);
1251 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1252 ETP_WMAX_V2, 0, 0);
1253 /* Multitouch capable pad, up to 5 fingers. */
1254 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1255 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1256 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1257 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1258 ETP_PMAX_V2, 0, 0);
1259 /*
1260 * The firmware reports how many trace lines the finger spans,
1261 * convert to surface unit as Protocol-B requires.
1262 */
1263 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1264 ETP_WMAX_V2 * width, 0, 0);
1265 break;
1266 }
1267
1268 input_abs_set_res(dev, ABS_X, x_res);
1269 input_abs_set_res(dev, ABS_Y, y_res);
1270 if (etd->hw_version > 1) {
1271 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
1272 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
1273 }
1274
1275 etd->y_max = y_max;
1276 etd->width = width;
1277
1278 return 0;
1279}
1280
1281struct elantech_attr_data {
1282 size_t field_offset;
1283 unsigned char reg;
1284};
1285
1286/*
1287 * Display a register value by reading a sysfs entry
1288 */
1289static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1290 char *buf)
1291{
1292 struct elantech_data *etd = psmouse->private;
1293 struct elantech_attr_data *attr = data;
1294 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1295 int rc = 0;
1296
1297 if (attr->reg)
1298 rc = elantech_read_reg(psmouse, attr->reg, reg);
1299
1300 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1301}
1302
1303/*
1304 * Write a register value by writing a sysfs entry
1305 */
1306static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1307 void *data, const char *buf, size_t count)
1308{
1309 struct elantech_data *etd = psmouse->private;
1310 struct elantech_attr_data *attr = data;
1311 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1312 unsigned char value;
1313 int err;
1314
1315 err = kstrtou8(buf, 16, &value);
1316 if (err)
1317 return err;
1318
1319 /* Do we need to preserve some bits for version 2 hardware too? */
1320 if (etd->hw_version == 1) {
1321 if (attr->reg == 0x10)
1322 /* Force absolute mode always on */
1323 value |= ETP_R10_ABSOLUTE_MODE;
1324 else if (attr->reg == 0x11)
1325 /* Force 4 byte mode always on */
1326 value |= ETP_R11_4_BYTE_MODE;
1327 }
1328
1329 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1330 *reg = value;
1331
1332 return count;
1333}
1334
1335#define ELANTECH_INT_ATTR(_name, _register) \
1336 static struct elantech_attr_data elantech_attr_##_name = { \
1337 .field_offset = offsetof(struct elantech_data, _name), \
1338 .reg = _register, \
1339 }; \
1340 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1341 &elantech_attr_##_name, \
1342 elantech_show_int_attr, \
1343 elantech_set_int_attr)
1344
1345ELANTECH_INT_ATTR(reg_07, 0x07);
1346ELANTECH_INT_ATTR(reg_10, 0x10);
1347ELANTECH_INT_ATTR(reg_11, 0x11);
1348ELANTECH_INT_ATTR(reg_20, 0x20);
1349ELANTECH_INT_ATTR(reg_21, 0x21);
1350ELANTECH_INT_ATTR(reg_22, 0x22);
1351ELANTECH_INT_ATTR(reg_23, 0x23);
1352ELANTECH_INT_ATTR(reg_24, 0x24);
1353ELANTECH_INT_ATTR(reg_25, 0x25);
1354ELANTECH_INT_ATTR(reg_26, 0x26);
1355ELANTECH_INT_ATTR(debug, 0);
1356ELANTECH_INT_ATTR(paritycheck, 0);
1357ELANTECH_INT_ATTR(crc_enabled, 0);
1358
1359static struct attribute *elantech_attrs[] = {
1360 &psmouse_attr_reg_07.dattr.attr,
1361 &psmouse_attr_reg_10.dattr.attr,
1362 &psmouse_attr_reg_11.dattr.attr,
1363 &psmouse_attr_reg_20.dattr.attr,
1364 &psmouse_attr_reg_21.dattr.attr,
1365 &psmouse_attr_reg_22.dattr.attr,
1366 &psmouse_attr_reg_23.dattr.attr,
1367 &psmouse_attr_reg_24.dattr.attr,
1368 &psmouse_attr_reg_25.dattr.attr,
1369 &psmouse_attr_reg_26.dattr.attr,
1370 &psmouse_attr_debug.dattr.attr,
1371 &psmouse_attr_paritycheck.dattr.attr,
1372 &psmouse_attr_crc_enabled.dattr.attr,
1373 NULL
1374};
1375
1376static const struct attribute_group elantech_attr_group = {
1377 .attrs = elantech_attrs,
1378};
1379
1380static bool elantech_is_signature_valid(const unsigned char *param)
1381{
1382 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1383 int i;
1384
1385 if (param[0] == 0)
1386 return false;
1387
1388 if (param[1] == 0)
1389 return true;
1390
1391 /*
1392 * Some hw_version >= 4 models have a revision higher then 20. Meaning
1393 * that param[2] may be 10 or 20, skip the rates check for these.
1394 */
1395 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f &&
1396 param[2] < 40)
1397 return true;
1398
1399 for (i = 0; i < ARRAY_SIZE(rates); i++)
1400 if (param[2] == rates[i])
1401 return false;
1402
1403 return true;
1404}
1405
1406/*
1407 * Use magic knock to detect Elantech touchpad
1408 */
1409int elantech_detect(struct psmouse *psmouse, bool set_properties)
1410{
1411 struct ps2dev *ps2dev = &psmouse->ps2dev;
1412 unsigned char param[3];
1413
1414 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1415
1416 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1417 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1418 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1419 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1420 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1421 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1422 return -1;
1423 }
1424
1425 /*
1426 * Report this in case there are Elantech models that use a different
1427 * set of magic numbers
1428 */
1429 if (param[0] != 0x3c || param[1] != 0x03 ||
1430 (param[2] != 0xc8 && param[2] != 0x00)) {
1431 psmouse_dbg(psmouse,
1432 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1433 param[0], param[1], param[2]);
1434 return -1;
1435 }
1436
1437 /*
1438 * Query touchpad's firmware version and see if it reports known
1439 * value to avoid mis-detection. Logitech mice are known to respond
1440 * to Elantech magic knock and there might be more.
1441 */
1442 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1443 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1444 return -1;
1445 }
1446
1447 psmouse_dbg(psmouse,
1448 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1449 param[0], param[1], param[2]);
1450
1451 if (!elantech_is_signature_valid(param)) {
1452 psmouse_dbg(psmouse,
1453 "Probably not a real Elantech touchpad. Aborting.\n");
1454 return -1;
1455 }
1456
1457 if (set_properties) {
1458 psmouse->vendor = "Elantech";
1459 psmouse->name = "Touchpad";
1460 }
1461
1462 return 0;
1463}
1464
1465/*
1466 * Clean up sysfs entries when disconnecting
1467 */
1468static void elantech_disconnect(struct psmouse *psmouse)
1469{
1470 struct elantech_data *etd = psmouse->private;
1471
1472 if (etd->tp_dev)
1473 input_unregister_device(etd->tp_dev);
1474 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1475 &elantech_attr_group);
1476 kfree(psmouse->private);
1477 psmouse->private = NULL;
1478}
1479
1480/*
1481 * Put the touchpad back into absolute mode when reconnecting
1482 */
1483static int elantech_reconnect(struct psmouse *psmouse)
1484{
1485 psmouse_reset(psmouse);
1486
1487 if (elantech_detect(psmouse, 0))
1488 return -1;
1489
1490 if (elantech_set_absolute_mode(psmouse)) {
1491 psmouse_err(psmouse,
1492 "failed to put touchpad back into absolute mode.\n");
1493 return -1;
1494 }
1495
1496 return 0;
1497}
1498
1499/*
1500 * Some hw_version 4 models do not work with crc_disabled
1501 */
1502static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
1503#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1504 {
1505 /* Fujitsu H730 does not work with crc_enabled == 0 */
1506 .matches = {
1507 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1508 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1509 },
1510 },
1511 {
1512 /* Fujitsu H760 does not work with crc_enabled == 0 */
1513 .matches = {
1514 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1515 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1516 },
1517 },
1518 {
1519 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */
1520 .matches = {
1521 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1522 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
1523 },
1524 },
1525 {
1526 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */
1527 .matches = {
1528 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1529 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"),
1530 },
1531 },
1532 {
1533 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */
1534 .matches = {
1535 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1536 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"),
1537 },
1538 },
1539 {
1540 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */
1541 .matches = {
1542 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1543 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"),
1544 },
1545 },
1546 {
1547 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */
1548 .matches = {
1549 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1550 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"),
1551 },
1552 },
1553 {
1554 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */
1555 .matches = {
1556 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1557 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"),
1558 },
1559 },
1560 {
1561 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
1562 .matches = {
1563 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1564 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
1565 },
1566 },
1567#endif
1568 { }
1569};
1570
1571/*
1572 * Some hw_version 3 models go into error state when we try to set
1573 * bit 3 and/or bit 1 of r10.
1574 */
1575static const struct dmi_system_id no_hw_res_dmi_table[] = {
1576#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1577 {
1578 /* Gigabyte U2442 */
1579 .matches = {
1580 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1581 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1582 },
1583 },
1584#endif
1585 { }
1586};
1587
1588/*
1589 * determine hardware version and set some properties according to it.
1590 */
1591static int elantech_set_properties(struct elantech_data *etd)
1592{
1593 /* This represents the version of IC body. */
1594 int ver = (etd->fw_version & 0x0f0000) >> 16;
1595
1596 /* Early version of Elan touchpads doesn't obey the rule. */
1597 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1598 etd->hw_version = 1;
1599 else {
1600 switch (ver) {
1601 case 2:
1602 case 4:
1603 etd->hw_version = 2;
1604 break;
1605 case 5:
1606 etd->hw_version = 3;
1607 break;
1608 case 6 ... 15:
1609 etd->hw_version = 4;
1610 break;
1611 default:
1612 return -1;
1613 }
1614 }
1615
1616 /* decide which send_cmd we're gonna use early */
1617 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
1618 synaptics_send_cmd;
1619
1620 /* Turn on packet checking by default */
1621 etd->paritycheck = 1;
1622
1623 /*
1624 * This firmware suffers from misreporting coordinates when
1625 * a touch action starts causing the mouse cursor or scrolled page
1626 * to jump. Enable a workaround.
1627 */
1628 etd->jumpy_cursor =
1629 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1630
1631 if (etd->hw_version > 1) {
1632 /* For now show extra debug information */
1633 etd->debug = 1;
1634
1635 if (etd->fw_version >= 0x020800)
1636 etd->reports_pressure = true;
1637 }
1638
1639 /*
1640 * The signatures of v3 and v4 packets change depending on the
1641 * value of this hardware flag.
1642 */
1643 etd->crc_enabled = (etd->fw_version & 0x4000) == 0x4000 ||
1644 dmi_check_system(elantech_dmi_force_crc_enabled);
1645
1646 /* Enable real hardware resolution on hw_version 3 ? */
1647 etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1648
1649 return 0;
1650}
1651
1652/*
1653 * Initialize the touchpad and create sysfs entries
1654 */
1655int elantech_init(struct psmouse *psmouse)
1656{
1657 struct elantech_data *etd;
1658 int i;
1659 int error = -EINVAL;
1660 unsigned char param[3];
1661 struct input_dev *tp_dev;
1662
1663 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
1664 if (!etd)
1665 return -ENOMEM;
1666
1667 psmouse_reset(psmouse);
1668
1669 etd->parity[0] = 1;
1670 for (i = 1; i < 256; i++)
1671 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1672
1673 /*
1674 * Do the version query again so we can store the result
1675 */
1676 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1677 psmouse_err(psmouse, "failed to query firmware version.\n");
1678 goto init_fail;
1679 }
1680 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1681
1682 if (elantech_set_properties(etd)) {
1683 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1684 goto init_fail;
1685 }
1686 psmouse_info(psmouse,
1687 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1688 etd->hw_version, param[0], param[1], param[2]);
1689
1690 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1691 etd->capabilities)) {
1692 psmouse_err(psmouse, "failed to query capabilities.\n");
1693 goto init_fail;
1694 }
1695 psmouse_info(psmouse,
1696 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1697 etd->capabilities[0], etd->capabilities[1],
1698 etd->capabilities[2]);
1699
1700 if (etd->hw_version != 1) {
1701 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, etd->samples)) {
1702 psmouse_err(psmouse, "failed to query sample data\n");
1703 goto init_fail;
1704 }
1705 psmouse_info(psmouse,
1706 "Elan sample query result %02x, %02x, %02x\n",
1707 etd->samples[0], etd->samples[1], etd->samples[2]);
1708 }
1709
1710 if (etd->samples[1] == 0x74 && etd->hw_version == 0x03) {
1711 /*
1712 * This module has a bug which makes absolute mode
1713 * unusable, so let's abort so we'll be using standard
1714 * PS/2 protocol.
1715 */
1716 psmouse_info(psmouse,
1717 "absolute mode broken, forcing standard PS/2 protocol\n");
1718 goto init_fail;
1719 }
1720
1721 if (elantech_set_absolute_mode(psmouse)) {
1722 psmouse_err(psmouse,
1723 "failed to put touchpad into absolute mode.\n");
1724 goto init_fail;
1725 }
1726
1727 if (etd->fw_version == 0x381f17) {
1728 etd->original_set_rate = psmouse->set_rate;
1729 psmouse->set_rate = elantech_set_rate_restore_reg_07;
1730 }
1731
1732 if (elantech_set_input_params(psmouse)) {
1733 psmouse_err(psmouse, "failed to query touchpad range.\n");
1734 goto init_fail;
1735 }
1736
1737 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1738 &elantech_attr_group);
1739 if (error) {
1740 psmouse_err(psmouse,
1741 "failed to create sysfs attributes, error: %d.\n",
1742 error);
1743 goto init_fail;
1744 }
1745
1746 /* The MSB indicates the presence of the trackpoint */
1747 if ((etd->capabilities[0] & 0x80) == 0x80) {
1748 tp_dev = input_allocate_device();
1749
1750 if (!tp_dev) {
1751 error = -ENOMEM;
1752 goto init_fail_tp_alloc;
1753 }
1754
1755 etd->tp_dev = tp_dev;
1756 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
1757 psmouse->ps2dev.serio->phys);
1758 tp_dev->phys = etd->tp_phys;
1759 tp_dev->name = "ETPS/2 Elantech TrackPoint";
1760 tp_dev->id.bustype = BUS_I8042;
1761 tp_dev->id.vendor = 0x0002;
1762 tp_dev->id.product = PSMOUSE_ELANTECH;
1763 tp_dev->id.version = 0x0000;
1764 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1765 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
1766 tp_dev->relbit[BIT_WORD(REL_X)] =
1767 BIT_MASK(REL_X) | BIT_MASK(REL_Y);
1768 tp_dev->keybit[BIT_WORD(BTN_LEFT)] =
1769 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
1770 BIT_MASK(BTN_RIGHT);
1771
1772 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit);
1773 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit);
1774
1775 error = input_register_device(etd->tp_dev);
1776 if (error < 0)
1777 goto init_fail_tp_reg;
1778 }
1779
1780 psmouse->protocol_handler = elantech_process_byte;
1781 psmouse->disconnect = elantech_disconnect;
1782 psmouse->reconnect = elantech_reconnect;
1783 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
1784
1785 return 0;
1786 init_fail_tp_reg:
1787 input_free_device(tp_dev);
1788 init_fail_tp_alloc:
1789 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1790 &elantech_attr_group);
1791 init_fail:
1792 psmouse_reset(psmouse);
1793 kfree(etd);
1794 return error;
1795}