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Input: elantech - packet checking for v2 hardware
[deliverable/linux.git] / drivers / input / mouse / elantech.c
CommitLineData
2a0bd75e 1/*
3f8c0df4 2 * Elantech Touchpad driver (v6)
2a0bd75e 3 *
3f8c0df4 4 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
2a0bd75e
AO		 5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 *
10 * Trademarks are the property of their respective owners.
11 */
12
d4ae84a8
DT		 13#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
14
2a0bd75e 15#include <linux/delay.h>
5a0e3ad6 16#include <linux/slab.h>
2a0bd75e
AO		 17#include <linux/module.h>
18#include <linux/input.h>
89eec4d7 19#include <linux/input/mt.h>
2a0bd75e
AO		 20#include <linux/serio.h>
21#include <linux/libps2.h>
22#include "psmouse.h"
23#include "elantech.h"
24
d4ae84a8
DT		 25#define elantech_debug(fmt, ...) \
26 do { \
27 if (etd->debug) \
28 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
2a0bd75e
AO		 29 } while (0)
30
f81bc788
FR		 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
2a0bd75e
AO		 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)) {
d4ae84a8 43 pr_err("synaptics_send_cmd query 0x%02x failed.\n", c);
2a0bd75e
AO		 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--;
d4ae84a8
DT		 66 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
67 command, tries);
2a0bd75e
AO		 68 msleep(ETP_PS2_COMMAND_DELAY);
69 } while (tries > 0);
70
71 if (rc)
d4ae84a8 72 pr_err("ps2 command 0x%02x failed.\n", command);
2a0bd75e
AO		 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)
d4ae84a8 114 pr_err("failed to read register 0x%02x.\n", reg);
2a0bd75e
AO		 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)
d4ae84a8 160 pr_err("failed to write register 0x%02x with value 0x%02x.\n",
2a0bd75e
AO		 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
d4ae84a8 173 printk(KERN_DEBUG pr_fmt("PS/2 packet ["));
2a0bd75e
AO		 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
504e8bee 190 if (etd->fw_version < 0x020000) {
e938fbfd
FR		 191 /*
192 * byte 0: D U p1 p2 1 p3 R L
193 * byte 1: f 0 th tw x9 x8 y9 y8
194 */
2a0bd75e
AO		 195 fingers = ((packet[1] & 0x80) >> 7) +
196 ((packet[1] & 0x30) >> 4);
197 } else {
e938fbfd
FR		 198 /*
199 * byte 0: n1 n0 p2 p1 1 p3 R L
200 * byte 1: 0 0 0 0 x9 x8 y9 y8
201 */
2a0bd75e
AO		 202 fingers = (packet[0] & 0xc0) >> 6;
203 }
204
3f8c0df4 205 if (etd->jumpy_cursor) {
7f29f17b
ÉP		 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++;
d4ae84a8 211 elantech_debug("discarding packet\n");
7f29f17b 212 return;
3f8c0df4
AO		 213 }
214 }
215
2a0bd75e
AO		 216 input_report_key(dev, BTN_TOUCH, fingers != 0);
217
e938fbfd
FR		 218 /*
219 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
220 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
221 */
2a0bd75e
AO		 222 if (fingers) {
223 input_report_abs(dev, ABS_X,
224 ((packet[1] & 0x0c) << 6) | packet[2]);
e938fbfd 225 input_report_abs(dev, ABS_Y,
230282a7 226 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
2a0bd75e
AO		 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
504e8bee 235 if (etd->fw_version < 0x020000 &&
230282a7 236 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 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
89eec4d7
ÉP		 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
2a0bd75e
AO		 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{
f941c705 273 struct elantech_data *etd = psmouse->private;
2a0bd75e
AO		 274 struct input_dev *dev = psmouse->dev;
275 unsigned char *packet = psmouse->packet;
461a7917
JD		 276 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
277 unsigned int width = 0, pres = 0;
2a0bd75e
AO		 278
279 /* byte 0: n1 n0 . . . . R L */
280 fingers = (packet[0] & 0xc0) >> 6;
2a0bd75e
AO		 281
282 switch (fingers) {
22462d9f
ÉP		 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... */
2a0bd75e 291 case 1:
e938fbfd 292 /*
11559619 293 * byte 1: . . . . x11 x10 x9 x8
e938fbfd
FR		 294 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
295 */
11559619 296 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
e938fbfd 297 /*
11559619 298 * byte 4: . . . . y11 y10 y9 y8
e938fbfd
FR		 299 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
300 */
230282a7 301 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
89eec4d7 302
f941c705
ÉP		 303 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
304 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
2a0bd75e
AO		 305 break;
306
307 case 2:
e938fbfd
FR		 308 /*
309 * The coordinate of each finger is reported separately
310 * with a lower resolution for two finger touches:
311 * byte 0: . . ay8 ax8 . . . .
312 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
313 */
461a7917 314 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
2a0bd75e 315 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
230282a7 316 y1 = etd->y_max -
461a7917 317 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
e938fbfd
FR		 318 /*
319 * byte 3: . . by8 bx8 . . . .
320 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
321 */
461a7917 322 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
2a0bd75e 323 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
230282a7 324 y2 = etd->y_max -
461a7917 325 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
f941c705
ÉP		 326
327 /* Unknown so just report sensible values */
328 pres = 127;
329 width = 7;
2a0bd75e
AO		 330 break;
331 }
332
461a7917
JD		 333 input_report_key(dev, BTN_TOUCH, fingers != 0);
334 if (fingers != 0) {
335 input_report_abs(dev, ABS_X, x1);
336 input_report_abs(dev, ABS_Y, y1);
337 }
89eec4d7 338 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
2a0bd75e
AO		 339 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
340 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
341 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
22462d9f 342 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
2a0bd75e
AO		 343 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
344 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
f941c705
ÉP		 345 if (etd->reports_pressure) {
346 input_report_abs(dev, ABS_PRESSURE, pres);
347 input_report_abs(dev, ABS_TOOL_WIDTH, width);
348 }
2a0bd75e
AO		 349
350 input_sync(dev);
351}
352
7894f21b 353static int elantech_packet_check_v1(struct psmouse *psmouse)
2a0bd75e
AO		 354{
355 struct elantech_data *etd = psmouse->private;
356 unsigned char *packet = psmouse->packet;
357 unsigned char p1, p2, p3;
358
359 /* Parity bits are placed differently */
504e8bee 360 if (etd->fw_version < 0x020000) {
2a0bd75e
AO		 361 /* byte 0: D U p1 p2 1 p3 R L */
362 p1 = (packet[0] & 0x20) >> 5;
363 p2 = (packet[0] & 0x10) >> 4;
364 } else {
365 /* byte 0: n1 n0 p2 p1 1 p3 R L */
366 p1 = (packet[0] & 0x10) >> 4;
367 p2 = (packet[0] & 0x20) >> 5;
368 }
369
370 p3 = (packet[0] & 0x04) >> 2;
371
372 return etd->parity[packet[1]] == p1 &&
373 etd->parity[packet[2]] == p2 &&
374 etd->parity[packet[3]] == p3;
375}
376
7894f21b
JD		 377static int elantech_packet_check_v2(struct psmouse *psmouse)
378{
379 struct elantech_data *etd = psmouse->private;
380 unsigned char *packet = psmouse->packet;
381
382 /*
383 * V2 hardware has two flavors. Older ones that do not report pressure,
384 * and newer ones that reports pressure and width. With newer ones, all
385 * packets (1, 2, 3 finger touch) have the same constant bits. With
386 * older ones, 1/3 finger touch packets and 2 finger touch packets
387 * have different constant bits.
388 * With all three cases, if the constant bits are not exactly what I
389 * expected, I consider them invalid.
390 */
391 if (etd->reports_pressure)
392 return (packet[0] & 0x0c) == 0x04 &&
393 (packet[3] & 0x0f) == 0x02;
394
395 if ((packet[0] & 0xc0) == 0x80)
396 return (packet[0] & 0x0c) == 0x0c &&
397 (packet[3] & 0x0e) == 0x08;
398
399 return (packet[0] & 0x3c) == 0x3c &&
400 (packet[1] & 0xf0) == 0x00 &&
401 (packet[3] & 0x3e) == 0x38 &&
402 (packet[4] & 0xf0) == 0x00;
403}
404
2a0bd75e
AO		 405/*
406 * Process byte stream from mouse and handle complete packets
407 */
408static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
409{
410 struct elantech_data *etd = psmouse->private;
411
412 if (psmouse->pktcnt < psmouse->pktsize)
413 return PSMOUSE_GOOD_DATA;
414
415 if (etd->debug > 1)
416 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
417
418 switch (etd->hw_version) {
419 case 1:
7894f21b 420 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
2a0bd75e
AO		 421 return PSMOUSE_BAD_DATA;
422
423 elantech_report_absolute_v1(psmouse);
424 break;
425
426 case 2:
7894f21b
JD		 427 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
428 return PSMOUSE_BAD_DATA;
429
2a0bd75e
AO		 430 elantech_report_absolute_v2(psmouse);
431 break;
432 }
433
434 return PSMOUSE_FULL_PACKET;
435}
436
437/*
438 * Put the touchpad into absolute mode
439 */
440static int elantech_set_absolute_mode(struct psmouse *psmouse)
441{
442 struct elantech_data *etd = psmouse->private;
443 unsigned char val;
444 int tries = ETP_READ_BACK_TRIES;
445 int rc = 0;
446
447 switch (etd->hw_version) {
448 case 1:
449 etd->reg_10 = 0x16;
450 etd->reg_11 = 0x8f;
451 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
452 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
453 rc = -1;
454 }
455 break;
456
457 case 2:
458 /* Windows driver values */
459 etd->reg_10 = 0x54;
460 etd->reg_11 = 0x88; /* 0x8a */
461 etd->reg_21 = 0x60; /* 0x00 */
462 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
463 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
464 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
465 rc = -1;
466 break;
467 }
b2546df6
AO		 468 }
469
470 if (rc == 0) {
2a0bd75e 471 /*
b2546df6
AO		 472 * Read back reg 0x10. For hardware version 1 we must make
473 * sure the absolute mode bit is set. For hardware version 2
474 * the touchpad is probably initalising and not ready until
475 * we read back the value we just wrote.
2a0bd75e
AO		 476 */
477 do {
478 rc = elantech_read_reg(psmouse, 0x10, &val);
479 if (rc == 0)
480 break;
481 tries--;
d4ae84a8 482 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 483 msleep(ETP_READ_BACK_DELAY);
484 } while (tries > 0);
b2546df6
AO		 485
486 if (rc) {
d4ae84a8 487 pr_err("failed to read back register 0x10.\n");
b2546df6
AO		 488 } else if (etd->hw_version == 1 &&
489 !(val & ETP_R10_ABSOLUTE_MODE)) {
d4ae84a8 490 pr_err("touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 491 rc = -1;
492 }
2a0bd75e
AO		 493 }
494
495 if (rc)
d4ae84a8 496 pr_err("failed to initialise registers.\n");
2a0bd75e
AO		 497
498 return rc;
499}
500
230282a7
JD		 501static void elantech_set_range(struct psmouse *psmouse,
502 unsigned int *x_min, unsigned int *y_min,
503 unsigned int *x_max, unsigned int *y_max)
504{
505 struct elantech_data *etd = psmouse->private;
506 int i;
507
508 switch (etd->hw_version) {
509 case 1:
510 *x_min = ETP_XMIN_V1;
511 *y_min = ETP_YMIN_V1;
512 *x_max = ETP_XMAX_V1;
513 *y_max = ETP_YMAX_V1;
514 break;
515
516 case 2:
517 if (etd->fw_version == 0x020800 ||
518 etd->fw_version == 0x020b00 ||
519 etd->fw_version == 0x020030) {
520 *x_min = ETP_XMIN_V2;
521 *y_min = ETP_YMIN_V2;
522 *x_max = ETP_XMAX_V2;
523 *y_max = ETP_YMAX_V2;
524 } else {
525 i = (etd->fw_version > 0x020800 &&
526 etd->fw_version < 0x020900) ? 1 : 2;
527 *x_min = 0;
528 *y_min = 0;
529 *x_max = (etd->capabilities[1] - i) * 64;
530 *y_max = (etd->capabilities[2] - i) * 64;
531 }
532 break;
533 }
534}
535
2a0bd75e
AO		 536/*
537 * Set the appropriate event bits for the input subsystem
538 */
539static void elantech_set_input_params(struct psmouse *psmouse)
540{
541 struct input_dev *dev = psmouse->dev;
542 struct elantech_data *etd = psmouse->private;
230282a7
JD		 543 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0;
544
545 elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max);
2a0bd75e
AO		 546
547 __set_bit(EV_KEY, dev->evbit);
548 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 549 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 550
551 __set_bit(BTN_LEFT, dev->keybit);
552 __set_bit(BTN_RIGHT, dev->keybit);
553
554 __set_bit(BTN_TOUCH, dev->keybit);
555 __set_bit(BTN_TOOL_FINGER, dev->keybit);
556 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
557 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
558
559 switch (etd->hw_version) {
560 case 1:
561 /* Rocker button */
504e8bee 562 if (etd->fw_version < 0x020000 &&
230282a7 563 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 564 __set_bit(BTN_FORWARD, dev->keybit);
565 __set_bit(BTN_BACK, dev->keybit);
566 }
230282a7
JD		 567 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
568 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 569 break;
570
571 case 2:
22462d9f 572 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
230282a7
JD		 573 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
574 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 575 if (etd->reports_pressure) {
576 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
577 ETP_PMAX_V2, 0, 0);
578 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
579 ETP_WMAX_V2, 0, 0);
580 }
89eec4d7
ÉP		 581 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
582 input_mt_init_slots(dev, 2);
230282a7
JD		 583 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
584 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 585 break;
586 }
230282a7
JD		 587
588 etd->y_max = y_max;
2a0bd75e
AO		 589}
590
591struct elantech_attr_data {
592 size_t field_offset;
593 unsigned char reg;
594};
595
596/*
597 * Display a register value by reading a sysfs entry
598 */
599static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
600 char *buf)
601{
602 struct elantech_data *etd = psmouse->private;
603 struct elantech_attr_data *attr = data;
604 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
605 int rc = 0;
606
607 if (attr->reg)
608 rc = elantech_read_reg(psmouse, attr->reg, reg);
609
610 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
611}
612
613/*
614 * Write a register value by writing a sysfs entry
615 */
616static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
617 void *data, const char *buf, size_t count)
618{
619 struct elantech_data *etd = psmouse->private;
620 struct elantech_attr_data *attr = data;
621 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
622 unsigned long value;
623 int err;
624
625 err = strict_strtoul(buf, 16, &value);
626 if (err)
627 return err;
628
629 if (value > 0xff)
630 return -EINVAL;
631
632 /* Do we need to preserve some bits for version 2 hardware too? */
633 if (etd->hw_version == 1) {
634 if (attr->reg == 0x10)
635 /* Force absolute mode always on */
636 value |= ETP_R10_ABSOLUTE_MODE;
637 else if (attr->reg == 0x11)
638 /* Force 4 byte mode always on */
639 value |= ETP_R11_4_BYTE_MODE;
640 }
641
642 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
643 *reg = value;
644
645 return count;
646}
647
648#define ELANTECH_INT_ATTR(_name, _register) \
649 static struct elantech_attr_data elantech_attr_##_name = { \
650 .field_offset = offsetof(struct elantech_data, _name), \
651 .reg = _register, \
652 }; \
653 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
654 &elantech_attr_##_name, \
655 elantech_show_int_attr, \
656 elantech_set_int_attr)
657
658ELANTECH_INT_ATTR(reg_10, 0x10);
659ELANTECH_INT_ATTR(reg_11, 0x11);
660ELANTECH_INT_ATTR(reg_20, 0x20);
661ELANTECH_INT_ATTR(reg_21, 0x21);
662ELANTECH_INT_ATTR(reg_22, 0x22);
663ELANTECH_INT_ATTR(reg_23, 0x23);
664ELANTECH_INT_ATTR(reg_24, 0x24);
665ELANTECH_INT_ATTR(reg_25, 0x25);
666ELANTECH_INT_ATTR(reg_26, 0x26);
667ELANTECH_INT_ATTR(debug, 0);
668ELANTECH_INT_ATTR(paritycheck, 0);
669
670static struct attribute *elantech_attrs[] = {
671 &psmouse_attr_reg_10.dattr.attr,
672 &psmouse_attr_reg_11.dattr.attr,
673 &psmouse_attr_reg_20.dattr.attr,
674 &psmouse_attr_reg_21.dattr.attr,
675 &psmouse_attr_reg_22.dattr.attr,
676 &psmouse_attr_reg_23.dattr.attr,
677 &psmouse_attr_reg_24.dattr.attr,
678 &psmouse_attr_reg_25.dattr.attr,
679 &psmouse_attr_reg_26.dattr.attr,
680 &psmouse_attr_debug.dattr.attr,
681 &psmouse_attr_paritycheck.dattr.attr,
682 NULL
683};
684
685static struct attribute_group elantech_attr_group = {
686 .attrs = elantech_attrs,
687};
688
a083632e
DT		 689static bool elantech_is_signature_valid(const unsigned char *param)
690{
691 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
692 int i;
693
694 if (param[0] == 0)
695 return false;
696
697 if (param[1] == 0)
698 return true;
699
700 for (i = 0; i < ARRAY_SIZE(rates); i++)
701 if (param[2] == rates[i])
702 return false;
703
704 return true;
705}
706
2a0bd75e
AO		 707/*
708 * Use magic knock to detect Elantech touchpad
709 */
b7802c5c 710int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 711{
712 struct ps2dev *ps2dev = &psmouse->ps2dev;
713 unsigned char param[3];
714
715 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
716
717 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
718 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
719 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
720 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
721 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
d4ae84a8 722 pr_debug("sending Elantech magic knock failed.\n");
2a0bd75e
AO		 723 return -1;
724 }
725
726 /*
727 * Report this in case there are Elantech models that use a different
728 * set of magic numbers
729 */
730 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
d4ae84a8 731 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 732 param[0], param[1], param[2]);
733 return -1;
734 }
735
736 /*
737 * Query touchpad's firmware version and see if it reports known
738 * value to avoid mis-detection. Logitech mice are known to respond
739 * to Elantech magic knock and there might be more.
740 */
741 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 742 pr_debug("failed to query firmware version.\n");
9ab7b25e
AO		 743 return -1;
744 }
745
d4ae84a8 746 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 747 param[0], param[1], param[2]);
748
a083632e 749 if (!elantech_is_signature_valid(param)) {
f81bc788 750 if (!force_elantech) {
d4ae84a8 751 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
f81bc788
FR		 752 return -1;
753 }
754
d4ae84a8 755 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
2a0bd75e
AO		 756 }
757
758 if (set_properties) {
759 psmouse->vendor = "Elantech";
760 psmouse->name = "Touchpad";
761 }
762
763 return 0;
764}
765
766/*
767 * Clean up sysfs entries when disconnecting
768 */
769static void elantech_disconnect(struct psmouse *psmouse)
770{
771 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
772 &elantech_attr_group);
773 kfree(psmouse->private);
774 psmouse->private = NULL;
775}
776
777/*
778 * Put the touchpad back into absolute mode when reconnecting
779 */
780static int elantech_reconnect(struct psmouse *psmouse)
781{
782 if (elantech_detect(psmouse, 0))
783 return -1;
784
785 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 786 pr_err("failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 787 return -1;
788 }
789
790 return 0;
791}
792
793/*
794 * Initialize the touchpad and create sysfs entries
795 */
796int elantech_init(struct psmouse *psmouse)
797{
798 struct elantech_data *etd;
799 int i, error;
800 unsigned char param[3];
801
9ab7b25e 802 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 803 if (!etd)
6792cbbb 804 return -ENOMEM;
2a0bd75e
AO		 805
806 etd->parity[0] = 1;
807 for (i = 1; i < 256; i++)
808 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
809
810 /*
9ab7b25e 811 * Do the version query again so we can store the result
2a0bd75e
AO		 812 */
813 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 814 pr_err("failed to query firmware version.\n");
2a0bd75e
AO		 815 goto init_fail;
816 }
504e8bee
DT		 817
818 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
2a0bd75e
AO		 819
820 /*
821 * Assume every version greater than this is new EeePC style
822 * hardware with 6 byte packets
823 */
504e8bee 824 if (etd->fw_version >= 0x020030) {
2a0bd75e
AO		 825 etd->hw_version = 2;
826 /* For now show extra debug information */
827 etd->debug = 1;
7894f21b 828 etd->paritycheck = 1;
f941c705
ÉP		 829
830 if (etd->fw_version >= 0x020800)
831 etd->reports_pressure = true;
832
2a0bd75e
AO		 833 } else {
834 etd->hw_version = 1;
835 etd->paritycheck = 1;
836 }
504e8bee 837
d4ae84a8 838 pr_info("assuming hardware version %d, firmware version %d.%d.%d\n",
504e8bee 839 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 840
230282a7
JD		 841 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
842 etd->capabilities)) {
d4ae84a8 843 pr_err("failed to query capabilities.\n");
2a0bd75e
AO		 844 goto init_fail;
845 }
d4ae84a8 846 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
230282a7
JD		 847 etd->capabilities[0], etd->capabilities[1],
848 etd->capabilities[2]);
2a0bd75e 849
3f8c0df4 850 /*
7f29f17b 851 * This firmware suffers from misreporting coordinates when
3f8c0df4
AO		 852 * a touch action starts causing the mouse cursor or scrolled page
853 * to jump. Enable a workaround.
854 */
7f29f17b
ÉP		 855 if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) {
856 pr_info("firmware version 2.0.34/2.6.0 detected, enabling jumpy cursor workaround\n");
857 etd->jumpy_cursor = true;
3f8c0df4
AO		 858 }
859
2a0bd75e 860 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 861 pr_err("failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 862 goto init_fail;
863 }
864
865 elantech_set_input_params(psmouse);
866
867 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
868 &elantech_attr_group);
869 if (error) {
d4ae84a8 870 pr_err("failed to create sysfs attributes, error: %d.\n", error);
2a0bd75e
AO		 871 goto init_fail;
872 }
873
874 psmouse->protocol_handler = elantech_process_byte;
875 psmouse->disconnect = elantech_disconnect;
876 psmouse->reconnect = elantech_reconnect;
877 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
878
879 return 0;
880
881 init_fail:
882 kfree(etd);
883 return -1;
884}
Linux kernel - Deliverables
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