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Input: elantech - remove ETP_EDGE_FUZZ_V2
[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
353static int elantech_check_parity_v1(struct psmouse *psmouse)
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
377/*
378 * Process byte stream from mouse and handle complete packets
379 */
380static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
381{
382 struct elantech_data *etd = psmouse->private;
383
384 if (psmouse->pktcnt < psmouse->pktsize)
385 return PSMOUSE_GOOD_DATA;
386
387 if (etd->debug > 1)
388 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
389
390 switch (etd->hw_version) {
391 case 1:
392 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
393 return PSMOUSE_BAD_DATA;
394
395 elantech_report_absolute_v1(psmouse);
396 break;
397
398 case 2:
399 /* We don't know how to check parity in protocol v2 */
400 elantech_report_absolute_v2(psmouse);
401 break;
402 }
403
404 return PSMOUSE_FULL_PACKET;
405}
406
407/*
408 * Put the touchpad into absolute mode
409 */
410static int elantech_set_absolute_mode(struct psmouse *psmouse)
411{
412 struct elantech_data *etd = psmouse->private;
413 unsigned char val;
414 int tries = ETP_READ_BACK_TRIES;
415 int rc = 0;
416
417 switch (etd->hw_version) {
418 case 1:
419 etd->reg_10 = 0x16;
420 etd->reg_11 = 0x8f;
421 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
422 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
423 rc = -1;
424 }
425 break;
426
427 case 2:
428 /* Windows driver values */
429 etd->reg_10 = 0x54;
430 etd->reg_11 = 0x88; /* 0x8a */
431 etd->reg_21 = 0x60; /* 0x00 */
432 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
433 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
434 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
435 rc = -1;
436 break;
437 }
b2546df6
AO		 438 }
439
440 if (rc == 0) {
2a0bd75e 441 /*
b2546df6
AO		 442 * Read back reg 0x10. For hardware version 1 we must make
443 * sure the absolute mode bit is set. For hardware version 2
444 * the touchpad is probably initalising and not ready until
445 * we read back the value we just wrote.
2a0bd75e
AO		 446 */
447 do {
448 rc = elantech_read_reg(psmouse, 0x10, &val);
449 if (rc == 0)
450 break;
451 tries--;
d4ae84a8 452 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 453 msleep(ETP_READ_BACK_DELAY);
454 } while (tries > 0);
b2546df6
AO		 455
456 if (rc) {
d4ae84a8 457 pr_err("failed to read back register 0x10.\n");
b2546df6
AO		 458 } else if (etd->hw_version == 1 &&
459 !(val & ETP_R10_ABSOLUTE_MODE)) {
d4ae84a8 460 pr_err("touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 461 rc = -1;
462 }
2a0bd75e
AO		 463 }
464
465 if (rc)
d4ae84a8 466 pr_err("failed to initialise registers.\n");
2a0bd75e
AO		 467
468 return rc;
469}
470
230282a7
JD		 471static void elantech_set_range(struct psmouse *psmouse,
472 unsigned int *x_min, unsigned int *y_min,
473 unsigned int *x_max, unsigned int *y_max)
474{
475 struct elantech_data *etd = psmouse->private;
476 int i;
477
478 switch (etd->hw_version) {
479 case 1:
480 *x_min = ETP_XMIN_V1;
481 *y_min = ETP_YMIN_V1;
482 *x_max = ETP_XMAX_V1;
483 *y_max = ETP_YMAX_V1;
484 break;
485
486 case 2:
487 if (etd->fw_version == 0x020800 ||
488 etd->fw_version == 0x020b00 ||
489 etd->fw_version == 0x020030) {
490 *x_min = ETP_XMIN_V2;
491 *y_min = ETP_YMIN_V2;
492 *x_max = ETP_XMAX_V2;
493 *y_max = ETP_YMAX_V2;
494 } else {
495 i = (etd->fw_version > 0x020800 &&
496 etd->fw_version < 0x020900) ? 1 : 2;
497 *x_min = 0;
498 *y_min = 0;
499 *x_max = (etd->capabilities[1] - i) * 64;
500 *y_max = (etd->capabilities[2] - i) * 64;
501 }
502 break;
503 }
504}
505
2a0bd75e
AO		 506/*
507 * Set the appropriate event bits for the input subsystem
508 */
509static void elantech_set_input_params(struct psmouse *psmouse)
510{
511 struct input_dev *dev = psmouse->dev;
512 struct elantech_data *etd = psmouse->private;
230282a7
JD		 513 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0;
514
515 elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max);
2a0bd75e
AO		 516
517 __set_bit(EV_KEY, dev->evbit);
518 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 519 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 520
521 __set_bit(BTN_LEFT, dev->keybit);
522 __set_bit(BTN_RIGHT, dev->keybit);
523
524 __set_bit(BTN_TOUCH, dev->keybit);
525 __set_bit(BTN_TOOL_FINGER, dev->keybit);
526 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
527 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
528
529 switch (etd->hw_version) {
530 case 1:
531 /* Rocker button */
504e8bee 532 if (etd->fw_version < 0x020000 &&
230282a7 533 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 534 __set_bit(BTN_FORWARD, dev->keybit);
535 __set_bit(BTN_BACK, dev->keybit);
536 }
230282a7
JD		 537 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
538 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 539 break;
540
541 case 2:
22462d9f 542 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
230282a7
JD		 543 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
544 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 545 if (etd->reports_pressure) {
546 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
547 ETP_PMAX_V2, 0, 0);
548 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
549 ETP_WMAX_V2, 0, 0);
550 }
89eec4d7
ÉP		 551 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
552 input_mt_init_slots(dev, 2);
230282a7
JD		 553 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
554 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 555 break;
556 }
230282a7
JD		 557
558 etd->y_max = y_max;
2a0bd75e
AO		 559}
560
561struct elantech_attr_data {
562 size_t field_offset;
563 unsigned char reg;
564};
565
566/*
567 * Display a register value by reading a sysfs entry
568 */
569static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
570 char *buf)
571{
572 struct elantech_data *etd = psmouse->private;
573 struct elantech_attr_data *attr = data;
574 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
575 int rc = 0;
576
577 if (attr->reg)
578 rc = elantech_read_reg(psmouse, attr->reg, reg);
579
580 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
581}
582
583/*
584 * Write a register value by writing a sysfs entry
585 */
586static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
587 void *data, const char *buf, size_t count)
588{
589 struct elantech_data *etd = psmouse->private;
590 struct elantech_attr_data *attr = data;
591 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
592 unsigned long value;
593 int err;
594
595 err = strict_strtoul(buf, 16, &value);
596 if (err)
597 return err;
598
599 if (value > 0xff)
600 return -EINVAL;
601
602 /* Do we need to preserve some bits for version 2 hardware too? */
603 if (etd->hw_version == 1) {
604 if (attr->reg == 0x10)
605 /* Force absolute mode always on */
606 value |= ETP_R10_ABSOLUTE_MODE;
607 else if (attr->reg == 0x11)
608 /* Force 4 byte mode always on */
609 value |= ETP_R11_4_BYTE_MODE;
610 }
611
612 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
613 *reg = value;
614
615 return count;
616}
617
618#define ELANTECH_INT_ATTR(_name, _register) \
619 static struct elantech_attr_data elantech_attr_##_name = { \
620 .field_offset = offsetof(struct elantech_data, _name), \
621 .reg = _register, \
622 }; \
623 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
624 &elantech_attr_##_name, \
625 elantech_show_int_attr, \
626 elantech_set_int_attr)
627
628ELANTECH_INT_ATTR(reg_10, 0x10);
629ELANTECH_INT_ATTR(reg_11, 0x11);
630ELANTECH_INT_ATTR(reg_20, 0x20);
631ELANTECH_INT_ATTR(reg_21, 0x21);
632ELANTECH_INT_ATTR(reg_22, 0x22);
633ELANTECH_INT_ATTR(reg_23, 0x23);
634ELANTECH_INT_ATTR(reg_24, 0x24);
635ELANTECH_INT_ATTR(reg_25, 0x25);
636ELANTECH_INT_ATTR(reg_26, 0x26);
637ELANTECH_INT_ATTR(debug, 0);
638ELANTECH_INT_ATTR(paritycheck, 0);
639
640static struct attribute *elantech_attrs[] = {
641 &psmouse_attr_reg_10.dattr.attr,
642 &psmouse_attr_reg_11.dattr.attr,
643 &psmouse_attr_reg_20.dattr.attr,
644 &psmouse_attr_reg_21.dattr.attr,
645 &psmouse_attr_reg_22.dattr.attr,
646 &psmouse_attr_reg_23.dattr.attr,
647 &psmouse_attr_reg_24.dattr.attr,
648 &psmouse_attr_reg_25.dattr.attr,
649 &psmouse_attr_reg_26.dattr.attr,
650 &psmouse_attr_debug.dattr.attr,
651 &psmouse_attr_paritycheck.dattr.attr,
652 NULL
653};
654
655static struct attribute_group elantech_attr_group = {
656 .attrs = elantech_attrs,
657};
658
a083632e
DT		 659static bool elantech_is_signature_valid(const unsigned char *param)
660{
661 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
662 int i;
663
664 if (param[0] == 0)
665 return false;
666
667 if (param[1] == 0)
668 return true;
669
670 for (i = 0; i < ARRAY_SIZE(rates); i++)
671 if (param[2] == rates[i])
672 return false;
673
674 return true;
675}
676
2a0bd75e
AO		 677/*
678 * Use magic knock to detect Elantech touchpad
679 */
b7802c5c 680int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 681{
682 struct ps2dev *ps2dev = &psmouse->ps2dev;
683 unsigned char param[3];
684
685 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
686
687 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
688 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
689 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
690 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
691 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
d4ae84a8 692 pr_debug("sending Elantech magic knock failed.\n");
2a0bd75e
AO		 693 return -1;
694 }
695
696 /*
697 * Report this in case there are Elantech models that use a different
698 * set of magic numbers
699 */
700 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
d4ae84a8 701 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 702 param[0], param[1], param[2]);
703 return -1;
704 }
705
706 /*
707 * Query touchpad's firmware version and see if it reports known
708 * value to avoid mis-detection. Logitech mice are known to respond
709 * to Elantech magic knock and there might be more.
710 */
711 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 712 pr_debug("failed to query firmware version.\n");
9ab7b25e
AO		 713 return -1;
714 }
715
d4ae84a8 716 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 717 param[0], param[1], param[2]);
718
a083632e 719 if (!elantech_is_signature_valid(param)) {
f81bc788 720 if (!force_elantech) {
d4ae84a8 721 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
f81bc788
FR		 722 return -1;
723 }
724
d4ae84a8 725 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
2a0bd75e
AO		 726 }
727
728 if (set_properties) {
729 psmouse->vendor = "Elantech";
730 psmouse->name = "Touchpad";
731 }
732
733 return 0;
734}
735
736/*
737 * Clean up sysfs entries when disconnecting
738 */
739static void elantech_disconnect(struct psmouse *psmouse)
740{
741 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
742 &elantech_attr_group);
743 kfree(psmouse->private);
744 psmouse->private = NULL;
745}
746
747/*
748 * Put the touchpad back into absolute mode when reconnecting
749 */
750static int elantech_reconnect(struct psmouse *psmouse)
751{
752 if (elantech_detect(psmouse, 0))
753 return -1;
754
755 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 756 pr_err("failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 757 return -1;
758 }
759
760 return 0;
761}
762
763/*
764 * Initialize the touchpad and create sysfs entries
765 */
766int elantech_init(struct psmouse *psmouse)
767{
768 struct elantech_data *etd;
769 int i, error;
770 unsigned char param[3];
771
9ab7b25e 772 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 773 if (!etd)
6792cbbb 774 return -ENOMEM;
2a0bd75e
AO		 775
776 etd->parity[0] = 1;
777 for (i = 1; i < 256; i++)
778 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
779
780 /*
9ab7b25e 781 * Do the version query again so we can store the result
2a0bd75e
AO		 782 */
783 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 784 pr_err("failed to query firmware version.\n");
2a0bd75e
AO		 785 goto init_fail;
786 }
504e8bee
DT		 787
788 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
2a0bd75e
AO		 789
790 /*
791 * Assume every version greater than this is new EeePC style
792 * hardware with 6 byte packets
793 */
504e8bee 794 if (etd->fw_version >= 0x020030) {
2a0bd75e
AO		 795 etd->hw_version = 2;
796 /* For now show extra debug information */
797 etd->debug = 1;
798 /* Don't know how to do parity checking for version 2 */
799 etd->paritycheck = 0;
f941c705
ÉP		 800
801 if (etd->fw_version >= 0x020800)
802 etd->reports_pressure = true;
803
2a0bd75e
AO		 804 } else {
805 etd->hw_version = 1;
806 etd->paritycheck = 1;
807 }
504e8bee 808
d4ae84a8 809 pr_info("assuming hardware version %d, firmware version %d.%d.%d\n",
504e8bee 810 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 811
230282a7
JD		 812 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
813 etd->capabilities)) {
d4ae84a8 814 pr_err("failed to query capabilities.\n");
2a0bd75e
AO		 815 goto init_fail;
816 }
d4ae84a8 817 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
230282a7
JD		 818 etd->capabilities[0], etd->capabilities[1],
819 etd->capabilities[2]);
2a0bd75e 820
3f8c0df4 821 /*
7f29f17b 822 * This firmware suffers from misreporting coordinates when
3f8c0df4
AO		 823 * a touch action starts causing the mouse cursor or scrolled page
824 * to jump. Enable a workaround.
825 */
7f29f17b
ÉP		 826 if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) {
827 pr_info("firmware version 2.0.34/2.6.0 detected, enabling jumpy cursor workaround\n");
828 etd->jumpy_cursor = true;
3f8c0df4
AO		 829 }
830
2a0bd75e 831 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 832 pr_err("failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 833 goto init_fail;
834 }
835
836 elantech_set_input_params(psmouse);
837
838 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
839 &elantech_attr_group);
840 if (error) {
d4ae84a8 841 pr_err("failed to create sysfs attributes, error: %d.\n", error);
2a0bd75e
AO		 842 goto init_fail;
843 }
844
845 psmouse->protocol_handler = elantech_process_byte;
846 psmouse->disconnect = elantech_disconnect;
847 psmouse->reconnect = elantech_reconnect;
848 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
849
850 return 0;
851
852 init_fail:
853 kfree(etd);
854 return -1;
855}
Linux kernel - Deliverables
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