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Input: iforce - fix Guillemot Jet Leader 3D entry
[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
13#include <linux/delay.h>
14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/serio.h>
17#include <linux/libps2.h>
18#include "psmouse.h"
19#include "elantech.h"
20
21#define elantech_debug(format, arg...) \
22 do { \
23 if (etd->debug) \
24 printk(KERN_DEBUG format, ##arg); \
25 } while (0)
26
f81bc788
FR		 27static bool force_elantech;
28module_param_named(force_elantech, force_elantech, bool, 0644);
29MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default).");
30
2a0bd75e
AO		 31/*
32 * Send a Synaptics style sliced query command
33 */
34static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
35 unsigned char *param)
36{
37 if (psmouse_sliced_command(psmouse, c) ||
38 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
39 pr_err("elantech.c: synaptics_send_cmd query 0x%02x failed.\n", c);
40 return -1;
41 }
42
43 return 0;
44}
45
46/*
47 * A retrying version of ps2_command
48 */
49static int elantech_ps2_command(struct psmouse *psmouse,
50 unsigned char *param, int command)
51{
52 struct ps2dev *ps2dev = &psmouse->ps2dev;
53 struct elantech_data *etd = psmouse->private;
54 int rc;
55 int tries = ETP_PS2_COMMAND_TRIES;
56
57 do {
58 rc = ps2_command(ps2dev, param, command);
59 if (rc == 0)
60 break;
61 tries--;
62 elantech_debug("elantech.c: retrying ps2 command 0x%02x (%d).\n",
63 command, tries);
64 msleep(ETP_PS2_COMMAND_DELAY);
65 } while (tries > 0);
66
67 if (rc)
68 pr_err("elantech.c: ps2 command 0x%02x failed.\n", command);
69
70 return rc;
71}
72
73/*
74 * Send an Elantech style special command to read a value from a register
75 */
76static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
77 unsigned char *val)
78{
79 struct elantech_data *etd = psmouse->private;
80 unsigned char param[3];
81 int rc = 0;
82
83 if (reg < 0x10 || reg > 0x26)
84 return -1;
85
86 if (reg > 0x11 && reg < 0x20)
87 return -1;
88
89 switch (etd->hw_version) {
90 case 1:
91 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
92 psmouse_sliced_command(psmouse, reg) ||
93 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
94 rc = -1;
95 }
96 break;
97
98 case 2:
99 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
100 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
101 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
102 elantech_ps2_command(psmouse, NULL, reg) ||
103 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
104 rc = -1;
105 }
106 break;
107 }
108
109 if (rc)
110 pr_err("elantech.c: failed to read register 0x%02x.\n", reg);
111 else
112 *val = param[0];
113
114 return rc;
115}
116
117/*
118 * Send an Elantech style special command to write a register with a value
119 */
120static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
121 unsigned char val)
122{
123 struct elantech_data *etd = psmouse->private;
124 int rc = 0;
125
126 if (reg < 0x10 || reg > 0x26)
127 return -1;
128
129 if (reg > 0x11 && reg < 0x20)
130 return -1;
131
132 switch (etd->hw_version) {
133 case 1:
134 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
135 psmouse_sliced_command(psmouse, reg) ||
136 psmouse_sliced_command(psmouse, val) ||
137 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
138 rc = -1;
139 }
140 break;
141
142 case 2:
143 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
144 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
145 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
146 elantech_ps2_command(psmouse, NULL, reg) ||
147 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
148 elantech_ps2_command(psmouse, NULL, val) ||
149 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
150 rc = -1;
151 }
152 break;
153 }
154
155 if (rc)
156 pr_err("elantech.c: failed to write register 0x%02x with value 0x%02x.\n",
157 reg, val);
158
159 return rc;
160}
161
162/*
163 * Dump a complete mouse movement packet to the syslog
164 */
165static void elantech_packet_dump(unsigned char *packet, int size)
166{
167 int i;
168
169 printk(KERN_DEBUG "elantech.c: PS/2 packet [");
170 for (i = 0; i < size; i++)
171 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
172 printk("]\n");
173}
174
175/*
176 * Interpret complete data packets and report absolute mode input events for
177 * hardware version 1. (4 byte packets)
178 */
179static void elantech_report_absolute_v1(struct psmouse *psmouse)
180{
181 struct input_dev *dev = psmouse->dev;
182 struct elantech_data *etd = psmouse->private;
183 unsigned char *packet = psmouse->packet;
184 int fingers;
3f8c0df4 185 static int old_fingers;
2a0bd75e
AO		 186
187 if (etd->fw_version_maj == 0x01) {
e938fbfd
FR		 188 /*
189 * byte 0: D U p1 p2 1 p3 R L
190 * byte 1: f 0 th tw x9 x8 y9 y8
191 */
2a0bd75e
AO		 192 fingers = ((packet[1] & 0x80) >> 7) +
193 ((packet[1] & 0x30) >> 4);
194 } else {
e938fbfd
FR		 195 /*
196 * byte 0: n1 n0 p2 p1 1 p3 R L
197 * byte 1: 0 0 0 0 x9 x8 y9 y8
198 */
2a0bd75e
AO		 199 fingers = (packet[0] & 0xc0) >> 6;
200 }
201
3f8c0df4
AO		 202 if (etd->jumpy_cursor) {
203 /* Discard packets that are likely to have bogus coordinates */
204 if (fingers > old_fingers) {
205 elantech_debug("elantech.c: discarding packet\n");
206 goto discard_packet_v1;
207 }
208 }
209
2a0bd75e
AO		 210 input_report_key(dev, BTN_TOUCH, fingers != 0);
211
e938fbfd
FR		 212 /*
213 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
214 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
215 */
2a0bd75e
AO		 216 if (fingers) {
217 input_report_abs(dev, ABS_X,
218 ((packet[1] & 0x0c) << 6) | packet[2]);
e938fbfd
FR		 219 input_report_abs(dev, ABS_Y,
220 ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3]));
2a0bd75e
AO		 221 }
222
223 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
224 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
225 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
226 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
227 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
228
229 if ((etd->fw_version_maj == 0x01) &&
230 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
231 /* rocker up */
232 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
233 /* rocker down */
234 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
235 }
236
237 input_sync(dev);
3f8c0df4
AO		 238
239 discard_packet_v1:
240 old_fingers = fingers;
2a0bd75e
AO		 241}
242
243/*
244 * Interpret complete data packets and report absolute mode input events for
245 * hardware version 2. (6 byte packets)
246 */
247static void elantech_report_absolute_v2(struct psmouse *psmouse)
248{
249 struct input_dev *dev = psmouse->dev;
250 unsigned char *packet = psmouse->packet;
251 int fingers, x1, y1, x2, y2;
252
253 /* byte 0: n1 n0 . . . . R L */
254 fingers = (packet[0] & 0xc0) >> 6;
255 input_report_key(dev, BTN_TOUCH, fingers != 0);
256
257 switch (fingers) {
258 case 1:
e938fbfd
FR		 259 /*
260 * byte 1: . . . . . x10 x9 x8
261 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
262 */
263 input_report_abs(dev, ABS_X,
264 ((packet[1] & 0x07) << 8) | packet[2]);
265 /*
266 * byte 4: . . . . . . y9 y8
267 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
268 */
269 input_report_abs(dev, ABS_Y,
270 ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5]));
2a0bd75e
AO		 271 break;
272
273 case 2:
e938fbfd
FR		 274 /*
275 * The coordinate of each finger is reported separately
276 * with a lower resolution for two finger touches:
277 * byte 0: . . ay8 ax8 . . . .
278 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
279 */
2a0bd75e
AO		 280 x1 = ((packet[0] & 0x10) << 4) | packet[1];
281 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
282 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
e938fbfd
FR		 283 /*
284 * byte 3: . . by8 bx8 . . . .
285 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
286 */
2a0bd75e
AO		 287 x2 = ((packet[3] & 0x10) << 4) | packet[4];
288 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
289 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
e938fbfd
FR		 290 /*
291 * For compatibility with the X Synaptics driver scale up
292 * one coordinate and report as ordinary mouse movent
293 */
2a0bd75e
AO		 294 input_report_abs(dev, ABS_X, x1 << 2);
295 input_report_abs(dev, ABS_Y, y1 << 2);
e938fbfd
FR		 296 /*
297 * For compatibility with the proprietary X Elantech driver
298 * report both coordinates as hat coordinates
299 */
2a0bd75e
AO		 300 input_report_abs(dev, ABS_HAT0X, x1);
301 input_report_abs(dev, ABS_HAT0Y, y1);
302 input_report_abs(dev, ABS_HAT1X, x2);
303 input_report_abs(dev, ABS_HAT1Y, y2);
304 break;
305 }
306
307 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
308 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
309 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
310 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
311 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
312
313 input_sync(dev);
314}
315
316static int elantech_check_parity_v1(struct psmouse *psmouse)
317{
318 struct elantech_data *etd = psmouse->private;
319 unsigned char *packet = psmouse->packet;
320 unsigned char p1, p2, p3;
321
322 /* Parity bits are placed differently */
323 if (etd->fw_version_maj == 0x01) {
324 /* byte 0: D U p1 p2 1 p3 R L */
325 p1 = (packet[0] & 0x20) >> 5;
326 p2 = (packet[0] & 0x10) >> 4;
327 } else {
328 /* byte 0: n1 n0 p2 p1 1 p3 R L */
329 p1 = (packet[0] & 0x10) >> 4;
330 p2 = (packet[0] & 0x20) >> 5;
331 }
332
333 p3 = (packet[0] & 0x04) >> 2;
334
335 return etd->parity[packet[1]] == p1 &&
336 etd->parity[packet[2]] == p2 &&
337 etd->parity[packet[3]] == p3;
338}
339
340/*
341 * Process byte stream from mouse and handle complete packets
342 */
343static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
344{
345 struct elantech_data *etd = psmouse->private;
346
347 if (psmouse->pktcnt < psmouse->pktsize)
348 return PSMOUSE_GOOD_DATA;
349
350 if (etd->debug > 1)
351 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
352
353 switch (etd->hw_version) {
354 case 1:
355 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
356 return PSMOUSE_BAD_DATA;
357
358 elantech_report_absolute_v1(psmouse);
359 break;
360
361 case 2:
362 /* We don't know how to check parity in protocol v2 */
363 elantech_report_absolute_v2(psmouse);
364 break;
365 }
366
367 return PSMOUSE_FULL_PACKET;
368}
369
370/*
371 * Put the touchpad into absolute mode
372 */
373static int elantech_set_absolute_mode(struct psmouse *psmouse)
374{
375 struct elantech_data *etd = psmouse->private;
376 unsigned char val;
377 int tries = ETP_READ_BACK_TRIES;
378 int rc = 0;
379
380 switch (etd->hw_version) {
381 case 1:
382 etd->reg_10 = 0x16;
383 etd->reg_11 = 0x8f;
384 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
385 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
386 rc = -1;
387 }
388 break;
389
390 case 2:
391 /* Windows driver values */
392 etd->reg_10 = 0x54;
393 etd->reg_11 = 0x88; /* 0x8a */
394 etd->reg_21 = 0x60; /* 0x00 */
395 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
396 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
397 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
398 rc = -1;
399 break;
400 }
b2546df6
AO		 401 }
402
403 if (rc == 0) {
2a0bd75e 404 /*
b2546df6
AO		 405 * Read back reg 0x10. For hardware version 1 we must make
406 * sure the absolute mode bit is set. For hardware version 2
407 * the touchpad is probably initalising and not ready until
408 * we read back the value we just wrote.
2a0bd75e
AO		 409 */
410 do {
411 rc = elantech_read_reg(psmouse, 0x10, &val);
412 if (rc == 0)
413 break;
414 tries--;
415 elantech_debug("elantech.c: retrying read (%d).\n",
b2546df6 416 tries);
2a0bd75e
AO		 417 msleep(ETP_READ_BACK_DELAY);
418 } while (tries > 0);
b2546df6
AO		 419
420 if (rc) {
2a0bd75e 421 pr_err("elantech.c: failed to read back register 0x10.\n");
b2546df6
AO		 422 } else if (etd->hw_version == 1 &&
423 !(val & ETP_R10_ABSOLUTE_MODE)) {
424 pr_err("elantech.c: touchpad refuses "
425 "to switch to absolute mode.\n");
426 rc = -1;
427 }
2a0bd75e
AO		 428 }
429
430 if (rc)
431 pr_err("elantech.c: failed to initialise registers.\n");
432
433 return rc;
434}
435
436/*
437 * Set the appropriate event bits for the input subsystem
438 */
439static void elantech_set_input_params(struct psmouse *psmouse)
440{
441 struct input_dev *dev = psmouse->dev;
442 struct elantech_data *etd = psmouse->private;
443
444 __set_bit(EV_KEY, dev->evbit);
445 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 446 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 447
448 __set_bit(BTN_LEFT, dev->keybit);
449 __set_bit(BTN_RIGHT, dev->keybit);
450
451 __set_bit(BTN_TOUCH, dev->keybit);
452 __set_bit(BTN_TOOL_FINGER, dev->keybit);
453 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
454 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
455
456 switch (etd->hw_version) {
457 case 1:
458 /* Rocker button */
459 if ((etd->fw_version_maj == 0x01) &&
460 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
461 __set_bit(BTN_FORWARD, dev->keybit);
462 __set_bit(BTN_BACK, dev->keybit);
463 }
464 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
465 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
466 break;
467
468 case 2:
469 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
470 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
471 input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
472 input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
473 input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
474 input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
475 break;
476 }
477}
478
479struct elantech_attr_data {
480 size_t field_offset;
481 unsigned char reg;
482};
483
484/*
485 * Display a register value by reading a sysfs entry
486 */
487static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
488 char *buf)
489{
490 struct elantech_data *etd = psmouse->private;
491 struct elantech_attr_data *attr = data;
492 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
493 int rc = 0;
494
495 if (attr->reg)
496 rc = elantech_read_reg(psmouse, attr->reg, reg);
497
498 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
499}
500
501/*
502 * Write a register value by writing a sysfs entry
503 */
504static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
505 void *data, const char *buf, size_t count)
506{
507 struct elantech_data *etd = psmouse->private;
508 struct elantech_attr_data *attr = data;
509 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
510 unsigned long value;
511 int err;
512
513 err = strict_strtoul(buf, 16, &value);
514 if (err)
515 return err;
516
517 if (value > 0xff)
518 return -EINVAL;
519
520 /* Do we need to preserve some bits for version 2 hardware too? */
521 if (etd->hw_version == 1) {
522 if (attr->reg == 0x10)
523 /* Force absolute mode always on */
524 value |= ETP_R10_ABSOLUTE_MODE;
525 else if (attr->reg == 0x11)
526 /* Force 4 byte mode always on */
527 value |= ETP_R11_4_BYTE_MODE;
528 }
529
530 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
531 *reg = value;
532
533 return count;
534}
535
536#define ELANTECH_INT_ATTR(_name, _register) \
537 static struct elantech_attr_data elantech_attr_##_name = { \
538 .field_offset = offsetof(struct elantech_data, _name), \
539 .reg = _register, \
540 }; \
541 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
542 &elantech_attr_##_name, \
543 elantech_show_int_attr, \
544 elantech_set_int_attr)
545
546ELANTECH_INT_ATTR(reg_10, 0x10);
547ELANTECH_INT_ATTR(reg_11, 0x11);
548ELANTECH_INT_ATTR(reg_20, 0x20);
549ELANTECH_INT_ATTR(reg_21, 0x21);
550ELANTECH_INT_ATTR(reg_22, 0x22);
551ELANTECH_INT_ATTR(reg_23, 0x23);
552ELANTECH_INT_ATTR(reg_24, 0x24);
553ELANTECH_INT_ATTR(reg_25, 0x25);
554ELANTECH_INT_ATTR(reg_26, 0x26);
555ELANTECH_INT_ATTR(debug, 0);
556ELANTECH_INT_ATTR(paritycheck, 0);
557
558static struct attribute *elantech_attrs[] = {
559 &psmouse_attr_reg_10.dattr.attr,
560 &psmouse_attr_reg_11.dattr.attr,
561 &psmouse_attr_reg_20.dattr.attr,
562 &psmouse_attr_reg_21.dattr.attr,
563 &psmouse_attr_reg_22.dattr.attr,
564 &psmouse_attr_reg_23.dattr.attr,
565 &psmouse_attr_reg_24.dattr.attr,
566 &psmouse_attr_reg_25.dattr.attr,
567 &psmouse_attr_reg_26.dattr.attr,
568 &psmouse_attr_debug.dattr.attr,
569 &psmouse_attr_paritycheck.dattr.attr,
570 NULL
571};
572
573static struct attribute_group elantech_attr_group = {
574 .attrs = elantech_attrs,
575};
576
577/*
578 * Use magic knock to detect Elantech touchpad
579 */
b7802c5c 580int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 581{
582 struct ps2dev *ps2dev = &psmouse->ps2dev;
583 unsigned char param[3];
584
585 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
586
587 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
588 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
589 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
590 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
591 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
9ab7b25e 592 pr_debug("elantech.c: sending Elantech magic knock failed.\n");
2a0bd75e
AO		 593 return -1;
594 }
595
596 /*
597 * Report this in case there are Elantech models that use a different
598 * set of magic numbers
599 */
600 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
9ab7b25e
AO		 601 pr_debug("elantech.c: "
602 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
603 param[0], param[1], param[2]);
604 return -1;
605 }
606
607 /*
608 * Query touchpad's firmware version and see if it reports known
609 * value to avoid mis-detection. Logitech mice are known to respond
610 * to Elantech magic knock and there might be more.
611 */
612 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
613 pr_debug("elantech.c: failed to query firmware version.\n");
614 return -1;
615 }
616
617 pr_debug("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
618 param[0], param[1], param[2]);
619
620 if (param[0] == 0 || param[1] != 0) {
f81bc788
FR		 621 if (!force_elantech) {
622 pr_debug("elantech.c: Probably not a real Elantech touchpad. Aborting.\n");
623 return -1;
624 }
625
626 pr_debug("elantech.c: Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
2a0bd75e
AO		 627 }
628
629 if (set_properties) {
630 psmouse->vendor = "Elantech";
631 psmouse->name = "Touchpad";
632 }
633
634 return 0;
635}
636
637/*
638 * Clean up sysfs entries when disconnecting
639 */
640static void elantech_disconnect(struct psmouse *psmouse)
641{
642 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
643 &elantech_attr_group);
644 kfree(psmouse->private);
645 psmouse->private = NULL;
646}
647
648/*
649 * Put the touchpad back into absolute mode when reconnecting
650 */
651static int elantech_reconnect(struct psmouse *psmouse)
652{
653 if (elantech_detect(psmouse, 0))
654 return -1;
655
656 if (elantech_set_absolute_mode(psmouse)) {
657 pr_err("elantech.c: failed to put touchpad back into absolute mode.\n");
658 return -1;
659 }
660
661 return 0;
662}
663
664/*
665 * Initialize the touchpad and create sysfs entries
666 */
667int elantech_init(struct psmouse *psmouse)
668{
669 struct elantech_data *etd;
670 int i, error;
671 unsigned char param[3];
672
9ab7b25e 673 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e
AO		 674 if (!etd)
675 return -1;
676
677 etd->parity[0] = 1;
678 for (i = 1; i < 256; i++)
679 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
680
681 /*
9ab7b25e 682 * Do the version query again so we can store the result
2a0bd75e
AO		 683 */
684 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
685 pr_err("elantech.c: failed to query firmware version.\n");
686 goto init_fail;
687 }
2a0bd75e
AO		 688 etd->fw_version_maj = param[0];
689 etd->fw_version_min = param[2];
690
691 /*
692 * Assume every version greater than this is new EeePC style
693 * hardware with 6 byte packets
694 */
225c61aa
FR		 695 if ((etd->fw_version_maj == 0x02 && etd->fw_version_min >= 0x30) ||
696 etd->fw_version_maj > 0x02) {
2a0bd75e
AO		 697 etd->hw_version = 2;
698 /* For now show extra debug information */
699 etd->debug = 1;
700 /* Don't know how to do parity checking for version 2 */
701 etd->paritycheck = 0;
702 } else {
703 etd->hw_version = 1;
704 etd->paritycheck = 1;
705 }
706 pr_info("elantech.c: assuming hardware version %d, firmware version %d.%d\n",
707 etd->hw_version, etd->fw_version_maj, etd->fw_version_min);
708
709 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
710 pr_err("elantech.c: failed to query capabilities.\n");
711 goto init_fail;
712 }
713 pr_info("elantech.c: Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
714 param[0], param[1], param[2]);
715 etd->capabilities = param[0];
716
3f8c0df4
AO		 717 /*
718 * This firmware seems to suffer from misreporting coordinates when
719 * a touch action starts causing the mouse cursor or scrolled page
720 * to jump. Enable a workaround.
721 */
722 if (etd->fw_version_maj == 0x02 && etd->fw_version_min == 0x22) {
723 pr_info("elantech.c: firmware version 2.34 detected, "
724 "enabling jumpy cursor workaround\n");
725 etd->jumpy_cursor = 1;
726 }
727
2a0bd75e
AO		 728 if (elantech_set_absolute_mode(psmouse)) {
729 pr_err("elantech.c: failed to put touchpad into absolute mode.\n");
730 goto init_fail;
731 }
732
733 elantech_set_input_params(psmouse);
734
735 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
736 &elantech_attr_group);
737 if (error) {
738 pr_err("elantech.c: failed to create sysfs attributes, error: %d.\n",
739 error);
740 goto init_fail;
741 }
742
743 psmouse->protocol_handler = elantech_process_byte;
744 psmouse->disconnect = elantech_disconnect;
745 psmouse->reconnect = elantech_reconnect;
746 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
747
748 return 0;
749
750 init_fail:
751 kfree(etd);
752 return -1;
753}
Linux kernel - Deliverables
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