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init from v2.6.32.60
[mach-moxart.git] / drivers / input / mouse / elantech.c
blob5b2339aefda7e310c84d6ca7cb68d31c09097685
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/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
27 static bool force_elantech;
28 module_param_named(force_elantech, force_elantech, bool, 0644);
29 MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default).");
30
31 /*
32 * Send a Synaptics style sliced query command
33 */
34 static 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 */
49 static 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 */
76 static 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 */
120 static 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 */
165 static 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 */
179 static 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;
185
186 if (etd->fw_version < 0x020000) {
187 /*
188 * byte 0: D U p1 p2 1 p3 R L
189 * byte 1: f 0 th tw x9 x8 y9 y8
190 */
191 fingers = ((packet[1] & 0x80) >> 7) +
192 ((packet[1] & 0x30) >> 4);
193 } else {
194 /*
195 * byte 0: n1 n0 p2 p1 1 p3 R L
196 * byte 1: 0 0 0 0 x9 x8 y9 y8
197 */
198 fingers = (packet[0] & 0xc0) >> 6;
199 }
200
201 if (etd->jumpy_cursor) {
202 if (fingers != 1) {
203 etd->single_finger_reports = 0;
204 } else if (etd->single_finger_reports < 2) {
205 /* Discard first 2 reports of one finger, bogus */
206 etd->single_finger_reports++;
207 elantech_debug("elantech.c: discarding packet\n");
208 return;
209 }
210 }
211
212 input_report_key(dev, BTN_TOUCH, fingers != 0);
213
214 /*
215 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
216 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
217 */
218 if (fingers) {
219 input_report_abs(dev, ABS_X,
220 ((packet[1] & 0x0c) << 6) | packet[2]);
221 input_report_abs(dev, ABS_Y,
222 ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3]));
223 }
224
225 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
226 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
227 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
228 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
229 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
230
231 if (etd->fw_version < 0x020000 &&
232 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
233 /* rocker up */
234 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
235 /* rocker down */
236 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
237 }
238
239 input_sync(dev);
240 }
241
242 /*
243 * Interpret complete data packets and report absolute mode input events for
244 * hardware version 2. (6 byte packets)
245 */
246 static void elantech_report_absolute_v2(struct psmouse *psmouse)
247 {
248 struct input_dev *dev = psmouse->dev;
249 unsigned char *packet = psmouse->packet;
250 int fingers, x1, y1, x2, y2;
251
252 /* byte 0: n1 n0 . . . . R L */
253 fingers = (packet[0] & 0xc0) >> 6;
254 input_report_key(dev, BTN_TOUCH, fingers != 0);
255
256 switch (fingers) {
257 case 1:
258 /*
259 * byte 1: . . . . . x10 x9 x8
260 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
261 */
262 input_report_abs(dev, ABS_X,
263 ((packet[1] & 0x07) << 8) | packet[2]);
264 /*
265 * byte 4: . . . . . . y9 y8
266 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
267 */
268 input_report_abs(dev, ABS_Y,
269 ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5]));
270 break;
271
272 case 2:
273 /*
274 * The coordinate of each finger is reported separately
275 * with a lower resolution for two finger touches:
276 * byte 0: . . ay8 ax8 . . . .
277 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
278 */
279 x1 = ((packet[0] & 0x10) << 4) | packet[1];
280 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
281 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
282 /*
283 * byte 3: . . by8 bx8 . . . .
284 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
285 */
286 x2 = ((packet[3] & 0x10) << 4) | packet[4];
287 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
288 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
289 /*
290 * For compatibility with the X Synaptics driver scale up
291 * one coordinate and report as ordinary mouse movent
292 */
293 input_report_abs(dev, ABS_X, x1 << 2);
294 input_report_abs(dev, ABS_Y, y1 << 2);
295 /*
296 * For compatibility with the proprietary X Elantech driver
297 * report both coordinates as hat coordinates
298 */
299 input_report_abs(dev, ABS_HAT0X, x1);
300 input_report_abs(dev, ABS_HAT0Y, y1);
301 input_report_abs(dev, ABS_HAT1X, x2);
302 input_report_abs(dev, ABS_HAT1Y, y2);
303 break;
304 }
305
306 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
307 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
308 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
309 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
310 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
311
312 input_sync(dev);
313 }
314
315 static int elantech_check_parity_v1(struct psmouse *psmouse)
316 {
317 struct elantech_data *etd = psmouse->private;
318 unsigned char *packet = psmouse->packet;
319 unsigned char p1, p2, p3;
320
321 /* Parity bits are placed differently */
322 if (etd->fw_version < 0x020000) {
323 /* byte 0: D U p1 p2 1 p3 R L */
324 p1 = (packet[0] & 0x20) >> 5;
325 p2 = (packet[0] & 0x10) >> 4;
326 } else {
327 /* byte 0: n1 n0 p2 p1 1 p3 R L */
328 p1 = (packet[0] & 0x10) >> 4;
329 p2 = (packet[0] & 0x20) >> 5;
330 }
331
332 p3 = (packet[0] & 0x04) >> 2;
333
334 return etd->parity[packet[1]] == p1 &&
335 etd->parity[packet[2]] == p2 &&
336 etd->parity[packet[3]] == p3;
337 }
338
339 /*
340 * Process byte stream from mouse and handle complete packets
341 */
342 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
343 {
344 struct elantech_data *etd = psmouse->private;
345
346 if (psmouse->pktcnt < psmouse->pktsize)
347 return PSMOUSE_GOOD_DATA;
348
349 if (etd->debug > 1)
350 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
351
352 switch (etd->hw_version) {
353 case 1:
354 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
355 return PSMOUSE_BAD_DATA;
356
357 elantech_report_absolute_v1(psmouse);
358 break;
359
360 case 2:
361 /* We don't know how to check parity in protocol v2 */
362 elantech_report_absolute_v2(psmouse);
363 break;
364 }
365
366 return PSMOUSE_FULL_PACKET;
367 }
368
369 /*
370 * Put the touchpad into absolute mode
371 */
372 static int elantech_set_absolute_mode(struct psmouse *psmouse)
373 {
374 struct elantech_data *etd = psmouse->private;
375 unsigned char val;
376 int tries = ETP_READ_BACK_TRIES;
377 int rc = 0;
378
379 switch (etd->hw_version) {
380 case 1:
381 etd->reg_10 = 0x16;
382 etd->reg_11 = 0x8f;
383 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
384 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
385 rc = -1;
386 }
387 break;
388
389 case 2:
390 /* Windows driver values */
391 etd->reg_10 = 0x54;
392 etd->reg_11 = 0x88; /* 0x8a */
393 etd->reg_21 = 0x60; /* 0x00 */
394 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
395 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
396 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
397 rc = -1;
398 break;
399 }
400 }
401
402 if (rc == 0) {
403 /*
404 * Read back reg 0x10. For hardware version 1 we must make
405 * sure the absolute mode bit is set. For hardware version 2
406 * the touchpad is probably initalising and not ready until
407 * we read back the value we just wrote.
408 */
409 do {
410 rc = elantech_read_reg(psmouse, 0x10, &val);
411 if (rc == 0)
412 break;
413 tries--;
414 elantech_debug("elantech.c: retrying read (%d).\n",
415 tries);
416 msleep(ETP_READ_BACK_DELAY);
417 } while (tries > 0);
418
419 if (rc) {
420 pr_err("elantech.c: failed to read back register 0x10.\n");
421 } else if (etd->hw_version == 1 &&
422 !(val & ETP_R10_ABSOLUTE_MODE)) {
423 pr_err("elantech.c: touchpad refuses "
424 "to switch to absolute mode.\n");
425 rc = -1;
426 }
427 }
428
429 if (rc)
430 pr_err("elantech.c: failed to initialise registers.\n");
431
432 return rc;
433 }
434
435 /*
436 * Set the appropriate event bits for the input subsystem
437 */
438 static void elantech_set_input_params(struct psmouse *psmouse)
439 {
440 struct input_dev *dev = psmouse->dev;
441 struct elantech_data *etd = psmouse->private;
442
443 __set_bit(EV_KEY, dev->evbit);
444 __set_bit(EV_ABS, dev->evbit);
445 __clear_bit(EV_REL, dev->evbit);
446
447 __set_bit(BTN_LEFT, dev->keybit);
448 __set_bit(BTN_RIGHT, dev->keybit);
449
450 __set_bit(BTN_TOUCH, dev->keybit);
451 __set_bit(BTN_TOOL_FINGER, dev->keybit);
452 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
453 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
454
455 switch (etd->hw_version) {
456 case 1:
457 /* Rocker button */
458 if (etd->fw_version < 0x020000 &&
459 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
460 __set_bit(BTN_FORWARD, dev->keybit);
461 __set_bit(BTN_BACK, dev->keybit);
462 }
463 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
464 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
465 break;
466
467 case 2:
468 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
469 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
470 input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
471 input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
472 input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
473 input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
474 break;
475 }
476 }
477
478 struct elantech_attr_data {
479 size_t field_offset;
480 unsigned char reg;
481 };
482
483 /*
484 * Display a register value by reading a sysfs entry
485 */
486 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
487 char *buf)
488 {
489 struct elantech_data *etd = psmouse->private;
490 struct elantech_attr_data *attr = data;
491 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
492 int rc = 0;
493
494 if (attr->reg)
495 rc = elantech_read_reg(psmouse, attr->reg, reg);
496
497 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
498 }
499
500 /*
501 * Write a register value by writing a sysfs entry
502 */
503 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
504 void *data, const char *buf, size_t count)
505 {
506 struct elantech_data *etd = psmouse->private;
507 struct elantech_attr_data *attr = data;
508 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
509 unsigned long value;
510 int err;
511
512 err = strict_strtoul(buf, 16, &value);
513 if (err)
514 return err;
515
516 if (value > 0xff)
517 return -EINVAL;
518
519 /* Do we need to preserve some bits for version 2 hardware too? */
520 if (etd->hw_version == 1) {
521 if (attr->reg == 0x10)
522 /* Force absolute mode always on */
523 value |= ETP_R10_ABSOLUTE_MODE;
524 else if (attr->reg == 0x11)
525 /* Force 4 byte mode always on */
526 value |= ETP_R11_4_BYTE_MODE;
527 }
528
529 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
530 *reg = value;
531
532 return count;
533 }
534
535 #define ELANTECH_INT_ATTR(_name, _register) \
536 static struct elantech_attr_data elantech_attr_##_name = { \
537 .field_offset = offsetof(struct elantech_data, _name), \
538 .reg = _register, \
539 }; \
540 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
541 &elantech_attr_##_name, \
542 elantech_show_int_attr, \
543 elantech_set_int_attr)
544
545 ELANTECH_INT_ATTR(reg_10, 0x10);
546 ELANTECH_INT_ATTR(reg_11, 0x11);
547 ELANTECH_INT_ATTR(reg_20, 0x20);
548 ELANTECH_INT_ATTR(reg_21, 0x21);
549 ELANTECH_INT_ATTR(reg_22, 0x22);
550 ELANTECH_INT_ATTR(reg_23, 0x23);
551 ELANTECH_INT_ATTR(reg_24, 0x24);
552 ELANTECH_INT_ATTR(reg_25, 0x25);
553 ELANTECH_INT_ATTR(reg_26, 0x26);
554 ELANTECH_INT_ATTR(debug, 0);
555 ELANTECH_INT_ATTR(paritycheck, 0);
556
557 static struct attribute *elantech_attrs[] = {
558 &psmouse_attr_reg_10.dattr.attr,
559 &psmouse_attr_reg_11.dattr.attr,
560 &psmouse_attr_reg_20.dattr.attr,
561 &psmouse_attr_reg_21.dattr.attr,
562 &psmouse_attr_reg_22.dattr.attr,
563 &psmouse_attr_reg_23.dattr.attr,
564 &psmouse_attr_reg_24.dattr.attr,
565 &psmouse_attr_reg_25.dattr.attr,
566 &psmouse_attr_reg_26.dattr.attr,
567 &psmouse_attr_debug.dattr.attr,
568 &psmouse_attr_paritycheck.dattr.attr,
569 NULL
570 };
571
572 static struct attribute_group elantech_attr_group = {
573 .attrs = elantech_attrs,
574 };
575
576 static bool elantech_is_signature_valid(const unsigned char *param)
577 {
578 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
579 int i;
580
581 if (param[0] == 0)
582 return false;
583
584 if (param[1] == 0)
585 return true;
586
587 for (i = 0; i < ARRAY_SIZE(rates); i++)
588 if (param[2] == rates[i])
589 return false;
590
591 return true;
592 }
593
594 /*
595 * Use magic knock to detect Elantech touchpad
596 */
597 int elantech_detect(struct psmouse *psmouse, bool set_properties)
598 {
599 struct ps2dev *ps2dev = &psmouse->ps2dev;
600 unsigned char param[3];
601
602 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
603
604 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
605 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
606 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
607 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
608 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
609 pr_debug("elantech.c: sending Elantech magic knock failed.\n");
610 return -1;
611 }
612
613 /*
614 * Report this in case there are Elantech models that use a different
615 * set of magic numbers
616 */
617 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
618 pr_debug("elantech.c: "
619 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
620 param[0], param[1], param[2]);
621 return -1;
622 }
623
624 /*
625 * Query touchpad's firmware version and see if it reports known
626 * value to avoid mis-detection. Logitech mice are known to respond
627 * to Elantech magic knock and there might be more.
628 */
629 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
630 pr_debug("elantech.c: failed to query firmware version.\n");
631 return -1;
632 }
633
634 pr_debug("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
635 param[0], param[1], param[2]);
636
637 if (!elantech_is_signature_valid(param)) {
638 if (!force_elantech) {
639 pr_debug("elantech.c: Probably not a real Elantech touchpad. Aborting.\n");
640 return -1;
641 }
642
643 pr_debug("elantech.c: Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
644 }
645
646 if (set_properties) {
647 psmouse->vendor = "Elantech";
648 psmouse->name = "Touchpad";
649 }
650
651 return 0;
652 }
653
654 /*
655 * Clean up sysfs entries when disconnecting
656 */
657 static void elantech_disconnect(struct psmouse *psmouse)
658 {
659 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
660 &elantech_attr_group);
661 kfree(psmouse->private);
662 psmouse->private = NULL;
663 }
664
665 /*
666 * Put the touchpad back into absolute mode when reconnecting
667 */
668 static int elantech_reconnect(struct psmouse *psmouse)
669 {
670 if (elantech_detect(psmouse, 0))
671 return -1;
672
673 if (elantech_set_absolute_mode(psmouse)) {
674 pr_err("elantech.c: failed to put touchpad back into absolute mode.\n");
675 return -1;
676 }
677
678 return 0;
679 }
680
681 /*
682 * Initialize the touchpad and create sysfs entries
683 */
684 int elantech_init(struct psmouse *psmouse)
685 {
686 struct elantech_data *etd;
687 int i, error;
688 unsigned char param[3];
689
690 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
691 if (!etd)
692 return -1;
693
694 etd->parity[0] = 1;
695 for (i = 1; i < 256; i++)
696 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
697
698 /*
699 * Do the version query again so we can store the result
700 */
701 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
702 pr_err("elantech.c: failed to query firmware version.\n");
703 goto init_fail;
704 }
705
706 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
707
708 /*
709 * Assume every version greater than this is new EeePC style
710 * hardware with 6 byte packets
711 */
712 if (etd->fw_version >= 0x020030) {
713 etd->hw_version = 2;
714 /* For now show extra debug information */
715 etd->debug = 1;
716 /* Don't know how to do parity checking for version 2 */
717 etd->paritycheck = 0;
718 } else {
719 etd->hw_version = 1;
720 etd->paritycheck = 1;
721 }
722
723 pr_info("elantech.c: assuming hardware version %d, firmware version %d.%d.%d\n",
724 etd->hw_version, param[0], param[1], param[2]);
725
726 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
727 pr_err("elantech.c: failed to query capabilities.\n");
728 goto init_fail;
729 }
730 pr_info("elantech.c: Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
731 param[0], param[1], param[2]);
732 etd->capabilities = param[0];
733
734 /*
735 * This firmware suffers from misreporting coordinates when
736 * a touch action starts causing the mouse cursor or scrolled page
737 * to jump. Enable a workaround.
738 */
739 if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) {
740 pr_info("elantech.c: firmware version 2.0.34/2.6.0 detected, "
741 "enabling jumpy cursor workaround\n");
742 etd->jumpy_cursor = true;
743 }
744
745 if (elantech_set_absolute_mode(psmouse)) {
746 pr_err("elantech.c: failed to put touchpad into absolute mode.\n");
747 goto init_fail;
748 }
749
750 elantech_set_input_params(psmouse);
751
752 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
753 &elantech_attr_group);
754 if (error) {
755 pr_err("elantech.c: failed to create sysfs attributes, error: %d.\n",
756 error);
757 goto init_fail;
758 }
759
760 psmouse->protocol_handler = elantech_process_byte;
761 psmouse->disconnect = elantech_disconnect;
762 psmouse->reconnect = elantech_reconnect;
763 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
764
765 return 0;
766
767 init_fail:
768 kfree(etd);
769 return -1;
770 }
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