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Input: wacom - correct max Y value on medium bamboos
[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
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)) {
d4ae84a8 39 pr_err("synaptics_send_cmd query 0x%02x failed.\n", c);
2a0bd75e
AO		 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--;
d4ae84a8
DT		 62 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
63 command, tries);
2a0bd75e
AO		 64 msleep(ETP_PS2_COMMAND_DELAY);
65 } while (tries > 0);
66
67 if (rc)
d4ae84a8 68 pr_err("ps2 command 0x%02x failed.\n", command);
2a0bd75e
AO		 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
1dc6edec 83 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 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;
28f49616 107
1dc6edec 108 case 3 ... 4:
28f49616
JD		 109 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
110 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
111 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
112 elantech_ps2_command(psmouse, NULL, reg) ||
113 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
114 rc = -1;
115 }
116 break;
2a0bd75e
AO		 117 }
118
119 if (rc)
d4ae84a8 120 pr_err("failed to read register 0x%02x.\n", reg);
1dc6edec 121 else if (etd->hw_version != 4)
2a0bd75e 122 *val = param[0];
1dc6edec
JD		 123 else
124 *val = param[1];
2a0bd75e
AO		 125
126 return rc;
127}
128
129/*
130 * Send an Elantech style special command to write a register with a value
131 */
132static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
133 unsigned char val)
134{
135 struct elantech_data *etd = psmouse->private;
136 int rc = 0;
137
1dc6edec 138 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 139 return -1;
140
141 if (reg > 0x11 && reg < 0x20)
142 return -1;
143
144 switch (etd->hw_version) {
145 case 1:
146 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
147 psmouse_sliced_command(psmouse, reg) ||
148 psmouse_sliced_command(psmouse, val) ||
149 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
150 rc = -1;
151 }
152 break;
153
154 case 2:
155 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
156 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
157 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
158 elantech_ps2_command(psmouse, NULL, reg) ||
159 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
160 elantech_ps2_command(psmouse, NULL, val) ||
161 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
162 rc = -1;
163 }
164 break;
28f49616
JD		 165
166 case 3:
167 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
168 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
169 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
170 elantech_ps2_command(psmouse, NULL, reg) ||
171 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
172 elantech_ps2_command(psmouse, NULL, val) ||
173 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
174 rc = -1;
175 }
176 break;
1dc6edec
JD		 177
178 case 4:
179 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
180 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
181 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
182 elantech_ps2_command(psmouse, NULL, reg) ||
183 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
184 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
185 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
186 elantech_ps2_command(psmouse, NULL, val) ||
187 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
188 rc = -1;
189 }
190 break;
2a0bd75e
AO		 191 }
192
193 if (rc)
d4ae84a8 194 pr_err("failed to write register 0x%02x with value 0x%02x.\n",
2a0bd75e
AO		 195 reg, val);
196
197 return rc;
198}
199
200/*
201 * Dump a complete mouse movement packet to the syslog
202 */
203static void elantech_packet_dump(unsigned char *packet, int size)
204{
205 int i;
206
d4ae84a8 207 printk(KERN_DEBUG pr_fmt("PS/2 packet ["));
2a0bd75e
AO		 208 for (i = 0; i < size; i++)
209 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
210 printk("]\n");
211}
212
213/*
214 * Interpret complete data packets and report absolute mode input events for
215 * hardware version 1. (4 byte packets)
216 */
217static void elantech_report_absolute_v1(struct psmouse *psmouse)
218{
219 struct input_dev *dev = psmouse->dev;
220 struct elantech_data *etd = psmouse->private;
221 unsigned char *packet = psmouse->packet;
222 int fingers;
223
504e8bee 224 if (etd->fw_version < 0x020000) {
e938fbfd
FR		 225 /*
226 * byte 0: D U p1 p2 1 p3 R L
227 * byte 1: f 0 th tw x9 x8 y9 y8
228 */
2a0bd75e
AO		 229 fingers = ((packet[1] & 0x80) >> 7) +
230 ((packet[1] & 0x30) >> 4);
231 } else {
e938fbfd
FR		 232 /*
233 * byte 0: n1 n0 p2 p1 1 p3 R L
234 * byte 1: 0 0 0 0 x9 x8 y9 y8
235 */
2a0bd75e
AO		 236 fingers = (packet[0] & 0xc0) >> 6;
237 }
238
3f8c0df4 239 if (etd->jumpy_cursor) {
7f29f17b
ÉP		 240 if (fingers != 1) {
241 etd->single_finger_reports = 0;
242 } else if (etd->single_finger_reports < 2) {
243 /* Discard first 2 reports of one finger, bogus */
244 etd->single_finger_reports++;
d4ae84a8 245 elantech_debug("discarding packet\n");
7f29f17b 246 return;
3f8c0df4
AO		 247 }
248 }
249
2a0bd75e
AO		 250 input_report_key(dev, BTN_TOUCH, fingers != 0);
251
e938fbfd
FR		 252 /*
253 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
254 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
255 */
2a0bd75e
AO		 256 if (fingers) {
257 input_report_abs(dev, ABS_X,
258 ((packet[1] & 0x0c) << 6) | packet[2]);
e938fbfd 259 input_report_abs(dev, ABS_Y,
230282a7 260 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
2a0bd75e
AO		 261 }
262
263 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
264 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
265 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
266 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
267 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
268
504e8bee 269 if (etd->fw_version < 0x020000 &&
230282a7 270 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 271 /* rocker up */
272 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
273 /* rocker down */
274 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
275 }
276
277 input_sync(dev);
278}
279
89eec4d7
ÉP		 280static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
281 unsigned int x, unsigned int y)
282{
283 input_mt_slot(dev, slot);
284 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
285 if (active) {
286 input_report_abs(dev, ABS_MT_POSITION_X, x);
287 input_report_abs(dev, ABS_MT_POSITION_Y, y);
288 }
289}
290
291/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
292static void elantech_report_semi_mt_data(struct input_dev *dev,
293 unsigned int num_fingers,
294 unsigned int x1, unsigned int y1,
295 unsigned int x2, unsigned int y2)
296{
297 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
298 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
299}
300
2a0bd75e
AO		 301/*
302 * Interpret complete data packets and report absolute mode input events for
303 * hardware version 2. (6 byte packets)
304 */
305static void elantech_report_absolute_v2(struct psmouse *psmouse)
306{
f941c705 307 struct elantech_data *etd = psmouse->private;
2a0bd75e
AO		 308 struct input_dev *dev = psmouse->dev;
309 unsigned char *packet = psmouse->packet;
461a7917
JD		 310 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
311 unsigned int width = 0, pres = 0;
2a0bd75e
AO		 312
313 /* byte 0: n1 n0 . . . . R L */
314 fingers = (packet[0] & 0xc0) >> 6;
2a0bd75e
AO		 315
316 switch (fingers) {
22462d9f
ÉP		 317 case 3:
318 /*
319 * Same as one finger, except report of more than 3 fingers:
320 * byte 3: n4 . w1 w0 . . . .
321 */
322 if (packet[3] & 0x80)
323 fingers = 4;
324 /* pass through... */
2a0bd75e 325 case 1:
e938fbfd 326 /*
11559619 327 * byte 1: . . . . x11 x10 x9 x8
e938fbfd
FR		 328 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
329 */
11559619 330 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
e938fbfd 331 /*
11559619 332 * byte 4: . . . . y11 y10 y9 y8
e938fbfd
FR		 333 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
334 */
230282a7 335 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
89eec4d7 336
f941c705
ÉP		 337 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
338 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
2a0bd75e
AO		 339 break;
340
341 case 2:
e938fbfd
FR		 342 /*
343 * The coordinate of each finger is reported separately
344 * with a lower resolution for two finger touches:
345 * byte 0: . . ay8 ax8 . . . .
346 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
347 */
461a7917 348 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
2a0bd75e 349 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
230282a7 350 y1 = etd->y_max -
461a7917 351 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
e938fbfd
FR		 352 /*
353 * byte 3: . . by8 bx8 . . . .
354 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
355 */
461a7917 356 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
2a0bd75e 357 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
230282a7 358 y2 = etd->y_max -
461a7917 359 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
f941c705
ÉP		 360
361 /* Unknown so just report sensible values */
362 pres = 127;
363 width = 7;
2a0bd75e
AO		 364 break;
365 }
366
461a7917
JD		 367 input_report_key(dev, BTN_TOUCH, fingers != 0);
368 if (fingers != 0) {
369 input_report_abs(dev, ABS_X, x1);
370 input_report_abs(dev, ABS_Y, y1);
371 }
89eec4d7 372 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
2a0bd75e
AO		 373 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
374 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
375 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
22462d9f 376 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
2a0bd75e
AO		 377 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
378 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
f941c705
ÉP		 379 if (etd->reports_pressure) {
380 input_report_abs(dev, ABS_PRESSURE, pres);
381 input_report_abs(dev, ABS_TOOL_WIDTH, width);
382 }
2a0bd75e
AO		 383
384 input_sync(dev);
385}
386
28f49616
JD		 387/*
388 * Interpret complete data packets and report absolute mode input events for
389 * hardware version 3. (12 byte packets for two fingers)
390 */
391static void elantech_report_absolute_v3(struct psmouse *psmouse,
392 int packet_type)
393{
394 struct input_dev *dev = psmouse->dev;
395 struct elantech_data *etd = psmouse->private;
396 unsigned char *packet = psmouse->packet;
397 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
398 unsigned int width = 0, pres = 0;
399
400 /* byte 0: n1 n0 . . . . R L */
401 fingers = (packet[0] & 0xc0) >> 6;
402
403 switch (fingers) {
404 case 3:
405 case 1:
406 /*
407 * byte 1: . . . . x11 x10 x9 x8
408 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
409 */
410 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
411 /*
412 * byte 4: . . . . y11 y10 y9 y8
413 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
414 */
415 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
416 break;
417
418 case 2:
419 if (packet_type == PACKET_V3_HEAD) {
420 /*
421 * byte 1: . . . . ax11 ax10 ax9 ax8
422 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
423 */
1dc6edec 424 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
28f49616
JD		 425 /*
426 * byte 4: . . . . ay11 ay10 ay9 ay8
427 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
428 */
1dc6edec 429 etd->mt[0].y = etd->y_max -
28f49616
JD		 430 (((packet[4] & 0x0f) << 8) | packet[5]);
431 /*
432 * wait for next packet
433 */
434 return;
435 }
436
437 /* packet_type == PACKET_V3_TAIL */
1dc6edec
JD		 438 x1 = etd->mt[0].x;
439 y1 = etd->mt[0].y;
28f49616
JD		 440 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
441 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
442 break;
443 }
444
445 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
446 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
447
448 input_report_key(dev, BTN_TOUCH, fingers != 0);
449 if (fingers != 0) {
450 input_report_abs(dev, ABS_X, x1);
451 input_report_abs(dev, ABS_Y, y1);
452 }
453 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
454 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
455 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
456 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
457 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
458 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
459 input_report_abs(dev, ABS_PRESSURE, pres);
460 input_report_abs(dev, ABS_TOOL_WIDTH, width);
461
462 input_sync(dev);
463}
464
1dc6edec
JD		 465static void elantech_input_sync_v4(struct psmouse *psmouse)
466{
467 struct input_dev *dev = psmouse->dev;
468 unsigned char *packet = psmouse->packet;
469
470 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
471 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
472 input_mt_report_pointer_emulation(dev, true);
473 input_sync(dev);
474}
475
476static void process_packet_status_v4(struct psmouse *psmouse)
477{
478 struct input_dev *dev = psmouse->dev;
479 unsigned char *packet = psmouse->packet;
480 unsigned fingers;
481 int i;
482
483 /* notify finger state change */
484 fingers = packet[1] & 0x1f;
485 for (i = 0; i < ETP_MAX_FINGERS; i++) {
486 if ((fingers & (1 << i)) == 0) {
487 input_mt_slot(dev, i);
488 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
489 }
490 }
491
492 elantech_input_sync_v4(psmouse);
493}
494
495static void process_packet_head_v4(struct psmouse *psmouse)
496{
497 struct input_dev *dev = psmouse->dev;
498 struct elantech_data *etd = psmouse->private;
499 unsigned char *packet = psmouse->packet;
500 int id = ((packet[3] & 0xe0) >> 5) - 1;
501 int pres, traces;
502
503 if (id < 0)
504 return;
505
506 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
507 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
508 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
509 traces = (packet[0] & 0xf0) >> 4;
510
511 input_mt_slot(dev, id);
512 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
513
514 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
515 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
516 input_report_abs(dev, ABS_MT_PRESSURE, pres);
517 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
518 /* report this for backwards compatibility */
519 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
520
521 elantech_input_sync_v4(psmouse);
522}
523
524static void process_packet_motion_v4(struct psmouse *psmouse)
525{
526 struct input_dev *dev = psmouse->dev;
527 struct elantech_data *etd = psmouse->private;
528 unsigned char *packet = psmouse->packet;
529 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
530 int id, sid;
531
532 id = ((packet[0] & 0xe0) >> 5) - 1;
533 if (id < 0)
534 return;
535
536 sid = ((packet[3] & 0xe0) >> 5) - 1;
537 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
538 /*
539 * Motion packets give us the delta of x, y values of specific fingers,
540 * but in two's complement. Let the compiler do the conversion for us.
541 * Also _enlarge_ the numbers to int, in case of overflow.
542 */
543 delta_x1 = (signed char)packet[1];
544 delta_y1 = (signed char)packet[2];
545 delta_x2 = (signed char)packet[4];
546 delta_y2 = (signed char)packet[5];
547
548 etd->mt[id].x += delta_x1 * weight;
549 etd->mt[id].y -= delta_y1 * weight;
550 input_mt_slot(dev, id);
551 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
552 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
553
554 if (sid >= 0) {
555 etd->mt[sid].x += delta_x2 * weight;
556 etd->mt[sid].y -= delta_y2 * weight;
557 input_mt_slot(dev, sid);
558 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
559 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
560 }
561
562 elantech_input_sync_v4(psmouse);
563}
564
565static void elantech_report_absolute_v4(struct psmouse *psmouse,
566 int packet_type)
567{
568 switch (packet_type) {
569 case PACKET_V4_STATUS:
570 process_packet_status_v4(psmouse);
571 break;
572
573 case PACKET_V4_HEAD:
574 process_packet_head_v4(psmouse);
575 break;
576
577 case PACKET_V4_MOTION:
578 process_packet_motion_v4(psmouse);
579 break;
580
581 case PACKET_UNKNOWN:
582 default:
583 /* impossible to get here */
584 break;
585 }
586}
587
7894f21b 588static int elantech_packet_check_v1(struct psmouse *psmouse)
2a0bd75e
AO		 589{
590 struct elantech_data *etd = psmouse->private;
591 unsigned char *packet = psmouse->packet;
592 unsigned char p1, p2, p3;
593
594 /* Parity bits are placed differently */
504e8bee 595 if (etd->fw_version < 0x020000) {
2a0bd75e
AO		 596 /* byte 0: D U p1 p2 1 p3 R L */
597 p1 = (packet[0] & 0x20) >> 5;
598 p2 = (packet[0] & 0x10) >> 4;
599 } else {
600 /* byte 0: n1 n0 p2 p1 1 p3 R L */
601 p1 = (packet[0] & 0x10) >> 4;
602 p2 = (packet[0] & 0x20) >> 5;
603 }
604
605 p3 = (packet[0] & 0x04) >> 2;
606
607 return etd->parity[packet[1]] == p1 &&
608 etd->parity[packet[2]] == p2 &&
609 etd->parity[packet[3]] == p3;
610}
611
84a90b61
JD		 612static int elantech_debounce_check_v2(struct psmouse *psmouse)
613{
614 /*
615 * When we encounter packet that matches this exactly, it means the
616 * hardware is in debounce status. Just ignore the whole packet.
617 */
618 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
619 unsigned char *packet = psmouse->packet;
620
621 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
622}
623
7894f21b
JD		 624static int elantech_packet_check_v2(struct psmouse *psmouse)
625{
626 struct elantech_data *etd = psmouse->private;
627 unsigned char *packet = psmouse->packet;
628
629 /*
630 * V2 hardware has two flavors. Older ones that do not report pressure,
631 * and newer ones that reports pressure and width. With newer ones, all
632 * packets (1, 2, 3 finger touch) have the same constant bits. With
633 * older ones, 1/3 finger touch packets and 2 finger touch packets
634 * have different constant bits.
635 * With all three cases, if the constant bits are not exactly what I
636 * expected, I consider them invalid.
637 */
638 if (etd->reports_pressure)
639 return (packet[0] & 0x0c) == 0x04 &&
640 (packet[3] & 0x0f) == 0x02;
641
642 if ((packet[0] & 0xc0) == 0x80)
643 return (packet[0] & 0x0c) == 0x0c &&
644 (packet[3] & 0x0e) == 0x08;
645
646 return (packet[0] & 0x3c) == 0x3c &&
647 (packet[1] & 0xf0) == 0x00 &&
648 (packet[3] & 0x3e) == 0x38 &&
649 (packet[4] & 0xf0) == 0x00;
650}
651
28f49616
JD		 652/*
653 * We check the constant bits to determine what packet type we get,
1dc6edec 654 * so packet checking is mandatory for v3 and later hardware.
28f49616
JD		 655 */
656static int elantech_packet_check_v3(struct psmouse *psmouse)
657{
658 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
659 unsigned char *packet = psmouse->packet;
660
661 /*
662 * check debounce first, it has the same signature in byte 0
663 * and byte 3 as PACKET_V3_HEAD.
664 */
665 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
666 return PACKET_DEBOUNCE;
667
668 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
669 return PACKET_V3_HEAD;
670
671 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
672 return PACKET_V3_TAIL;
673
674 return PACKET_UNKNOWN;
675}
676
1dc6edec
JD		 677static int elantech_packet_check_v4(struct psmouse *psmouse)
678{
679 unsigned char *packet = psmouse->packet;
680
681 if ((packet[0] & 0x0c) == 0x04 &&
682 (packet[3] & 0x1f) == 0x11)
683 return PACKET_V4_HEAD;
684
685 if ((packet[0] & 0x0c) == 0x04 &&
686 (packet[3] & 0x1f) == 0x12)
687 return PACKET_V4_MOTION;
688
689 if ((packet[0] & 0x0c) == 0x04 &&
690 (packet[3] & 0x1f) == 0x10)
691 return PACKET_V4_STATUS;
692
693 return PACKET_UNKNOWN;
694}
695
2a0bd75e
AO		 696/*
697 * Process byte stream from mouse and handle complete packets
698 */
699static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
700{
701 struct elantech_data *etd = psmouse->private;
28f49616 702 int packet_type;
2a0bd75e
AO		 703
704 if (psmouse->pktcnt < psmouse->pktsize)
705 return PSMOUSE_GOOD_DATA;
706
707 if (etd->debug > 1)
708 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
709
710 switch (etd->hw_version) {
711 case 1:
7894f21b 712 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
2a0bd75e
AO		 713 return PSMOUSE_BAD_DATA;
714
715 elantech_report_absolute_v1(psmouse);
716 break;
717
718 case 2:
84a90b61
JD		 719 /* ignore debounce */
720 if (elantech_debounce_check_v2(psmouse))
721 return PSMOUSE_FULL_PACKET;
722
7894f21b
JD		 723 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
724 return PSMOUSE_BAD_DATA;
725
2a0bd75e
AO		 726 elantech_report_absolute_v2(psmouse);
727 break;
28f49616
JD		 728
729 case 3:
730 packet_type = elantech_packet_check_v3(psmouse);
731 /* ignore debounce */
732 if (packet_type == PACKET_DEBOUNCE)
733 return PSMOUSE_FULL_PACKET;
734
735 if (packet_type == PACKET_UNKNOWN)
736 return PSMOUSE_BAD_DATA;
737
738 elantech_report_absolute_v3(psmouse, packet_type);
739 break;
1dc6edec
JD		 740
741 case 4:
742 packet_type = elantech_packet_check_v4(psmouse);
743 if (packet_type == PACKET_UNKNOWN)
744 return PSMOUSE_BAD_DATA;
745
746 elantech_report_absolute_v4(psmouse, packet_type);
747 break;
2a0bd75e
AO		 748 }
749
750 return PSMOUSE_FULL_PACKET;
751}
752
753/*
754 * Put the touchpad into absolute mode
755 */
756static int elantech_set_absolute_mode(struct psmouse *psmouse)
757{
758 struct elantech_data *etd = psmouse->private;
759 unsigned char val;
760 int tries = ETP_READ_BACK_TRIES;
761 int rc = 0;
762
763 switch (etd->hw_version) {
764 case 1:
765 etd->reg_10 = 0x16;
766 etd->reg_11 = 0x8f;
767 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
768 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
769 rc = -1;
770 }
771 break;
772
773 case 2:
774 /* Windows driver values */
775 etd->reg_10 = 0x54;
776 etd->reg_11 = 0x88; /* 0x8a */
777 etd->reg_21 = 0x60; /* 0x00 */
778 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
779 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
780 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
781 rc = -1;
2a0bd75e 782 }
28f49616
JD		 783 break;
784
785 case 3:
786 etd->reg_10 = 0x0b;
787 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
788 rc = -1;
789
790 break;
1dc6edec
JD		 791
792 case 4:
793 etd->reg_07 = 0x01;
794 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
795 rc = -1;
796
797 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
b2546df6
AO		 798 }
799
800 if (rc == 0) {
2a0bd75e 801 /*
b2546df6
AO		 802 * Read back reg 0x10. For hardware version 1 we must make
803 * sure the absolute mode bit is set. For hardware version 2
804 * the touchpad is probably initalising and not ready until
805 * we read back the value we just wrote.
2a0bd75e
AO		 806 */
807 do {
808 rc = elantech_read_reg(psmouse, 0x10, &val);
809 if (rc == 0)
810 break;
811 tries--;
d4ae84a8 812 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 813 msleep(ETP_READ_BACK_DELAY);
814 } while (tries > 0);
b2546df6
AO		 815
816 if (rc) {
d4ae84a8 817 pr_err("failed to read back register 0x10.\n");
b2546df6
AO		 818 } else if (etd->hw_version == 1 &&
819 !(val & ETP_R10_ABSOLUTE_MODE)) {
d4ae84a8 820 pr_err("touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 821 rc = -1;
822 }
2a0bd75e
AO		 823 }
824
1dc6edec 825 skip_readback_reg_10:
2a0bd75e 826 if (rc)
d4ae84a8 827 pr_err("failed to initialise registers.\n");
2a0bd75e
AO		 828
829 return rc;
830}
831
28f49616
JD		 832static int elantech_set_range(struct psmouse *psmouse,
833 unsigned int *x_min, unsigned int *y_min,
1dc6edec
JD		 834 unsigned int *x_max, unsigned int *y_max,
835 unsigned int *width)
230282a7
JD		 836{
837 struct elantech_data *etd = psmouse->private;
28f49616 838 unsigned char param[3];
1dc6edec 839 unsigned char traces;
230282a7
JD		 840
841 switch (etd->hw_version) {
842 case 1:
843 *x_min = ETP_XMIN_V1;
844 *y_min = ETP_YMIN_V1;
845 *x_max = ETP_XMAX_V1;
846 *y_max = ETP_YMAX_V1;
847 break;
848
849 case 2:
850 if (etd->fw_version == 0x020800 ||
851 etd->fw_version == 0x020b00 ||
852 etd->fw_version == 0x020030) {
853 *x_min = ETP_XMIN_V2;
854 *y_min = ETP_YMIN_V2;
855 *x_max = ETP_XMAX_V2;
856 *y_max = ETP_YMAX_V2;
857 } else {
84a90b61
JD		 858 int i;
859 int fixed_dpi;
860
230282a7
JD		 861 i = (etd->fw_version > 0x020800 &&
862 etd->fw_version < 0x020900) ? 1 : 2;
84a90b61
JD		 863
864 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
865 return -1;
866
867 fixed_dpi = param[1] & 0x10;
868
869 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
870 if (synaptics_send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
871 return -1;
872
873 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
874 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
875 } else if (etd->fw_version == 0x040216) {
876 *x_max = 819;
877 *y_max = 405;
878 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
879 *x_max = 900;
880 *y_max = 500;
881 } else {
882 *x_max = (etd->capabilities[1] - i) * 64;
883 *y_max = (etd->capabilities[2] - i) * 64;
884 }
230282a7
JD		 885 }
886 break;
28f49616
JD		 887
888 case 3:
889 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
890 return -1;
891
892 *x_max = (0x0f & param[0]) << 8 | param[1];
893 *y_max = (0xf0 & param[0]) << 4 | param[2];
894 break;
1dc6edec
JD		 895
896 case 4:
897 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
898 return -1;
899
900 *x_max = (0x0f & param[0]) << 8 | param[1];
901 *y_max = (0xf0 & param[0]) << 4 | param[2];
902 traces = etd->capabilities[1];
903 if ((traces < 2) || (traces > *x_max))
904 return -1;
905
906 *width = *x_max / (traces - 1);
907 break;
230282a7 908 }
28f49616
JD		 909
910 return 0;
230282a7
JD		 911}
912
2a0bd75e
AO		 913/*
914 * Set the appropriate event bits for the input subsystem
915 */
28f49616 916static int elantech_set_input_params(struct psmouse *psmouse)
2a0bd75e
AO		 917{
918 struct input_dev *dev = psmouse->dev;
919 struct elantech_data *etd = psmouse->private;
1dc6edec 920 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
230282a7 921
1dc6edec 922 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
28f49616 923 return -1;
2a0bd75e
AO		 924
925 __set_bit(EV_KEY, dev->evbit);
926 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 927 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 928
929 __set_bit(BTN_LEFT, dev->keybit);
930 __set_bit(BTN_RIGHT, dev->keybit);
931
932 __set_bit(BTN_TOUCH, dev->keybit);
933 __set_bit(BTN_TOOL_FINGER, dev->keybit);
934 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
935 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
936
937 switch (etd->hw_version) {
938 case 1:
939 /* Rocker button */
504e8bee 940 if (etd->fw_version < 0x020000 &&
230282a7 941 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 942 __set_bit(BTN_FORWARD, dev->keybit);
943 __set_bit(BTN_BACK, dev->keybit);
944 }
230282a7
JD		 945 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
946 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 947 break;
948
949 case 2:
22462d9f 950 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
28f49616
JD		 951 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
952 /* fall through */
953 case 3:
230282a7
JD		 954 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
955 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 956 if (etd->reports_pressure) {
957 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
958 ETP_PMAX_V2, 0, 0);
959 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
960 ETP_WMAX_V2, 0, 0);
961 }
89eec4d7 962 input_mt_init_slots(dev, 2);
230282a7
JD		 963 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
964 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e 965 break;
1dc6edec
JD		 966
967 case 4:
968 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
969 /* For X to recognize me as touchpad. */
970 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
971 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
972 /*
973 * range of pressure and width is the same as v2,
974 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
975 */
976 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
977 ETP_PMAX_V2, 0, 0);
978 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
979 ETP_WMAX_V2, 0, 0);
980 /* Multitouch capable pad, up to 5 fingers. */
981 input_mt_init_slots(dev, ETP_MAX_FINGERS);
982 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
983 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
984 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
985 ETP_PMAX_V2, 0, 0);
986 /*
987 * The firmware reports how many trace lines the finger spans,
988 * convert to surface unit as Protocol-B requires.
989 */
990 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
991 ETP_WMAX_V2 * width, 0, 0);
992 break;
2a0bd75e 993 }
230282a7
JD		 994
995 etd->y_max = y_max;
1dc6edec 996 etd->width = width;
28f49616
JD		 997
998 return 0;
2a0bd75e
AO		 999}
1000
1001struct elantech_attr_data {
1002 size_t field_offset;
1003 unsigned char reg;
1004};
1005
1006/*
1007 * Display a register value by reading a sysfs entry
1008 */
1009static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1010 char *buf)
1011{
1012 struct elantech_data *etd = psmouse->private;
1013 struct elantech_attr_data *attr = data;
1014 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1015 int rc = 0;
1016
1017 if (attr->reg)
1018 rc = elantech_read_reg(psmouse, attr->reg, reg);
1019
1020 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1021}
1022
1023/*
1024 * Write a register value by writing a sysfs entry
1025 */
1026static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1027 void *data, const char *buf, size_t count)
1028{
1029 struct elantech_data *etd = psmouse->private;
1030 struct elantech_attr_data *attr = data;
1031 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1032 unsigned long value;
1033 int err;
1034
1035 err = strict_strtoul(buf, 16, &value);
1036 if (err)
1037 return err;
1038
1039 if (value > 0xff)
1040 return -EINVAL;
1041
1042 /* Do we need to preserve some bits for version 2 hardware too? */
1043 if (etd->hw_version == 1) {
1044 if (attr->reg == 0x10)
1045 /* Force absolute mode always on */
1046 value |= ETP_R10_ABSOLUTE_MODE;
1047 else if (attr->reg == 0x11)
1048 /* Force 4 byte mode always on */
1049 value |= ETP_R11_4_BYTE_MODE;
1050 }
1051
1052 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1053 *reg = value;
1054
1055 return count;
1056}
1057
1058#define ELANTECH_INT_ATTR(_name, _register) \
1059 static struct elantech_attr_data elantech_attr_##_name = { \
1060 .field_offset = offsetof(struct elantech_data, _name), \
1061 .reg = _register, \
1062 }; \
1063 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1064 &elantech_attr_##_name, \
1065 elantech_show_int_attr, \
1066 elantech_set_int_attr)
1067
1dc6edec 1068ELANTECH_INT_ATTR(reg_07, 0x07);
2a0bd75e
AO		 1069ELANTECH_INT_ATTR(reg_10, 0x10);
1070ELANTECH_INT_ATTR(reg_11, 0x11);
1071ELANTECH_INT_ATTR(reg_20, 0x20);
1072ELANTECH_INT_ATTR(reg_21, 0x21);
1073ELANTECH_INT_ATTR(reg_22, 0x22);
1074ELANTECH_INT_ATTR(reg_23, 0x23);
1075ELANTECH_INT_ATTR(reg_24, 0x24);
1076ELANTECH_INT_ATTR(reg_25, 0x25);
1077ELANTECH_INT_ATTR(reg_26, 0x26);
1078ELANTECH_INT_ATTR(debug, 0);
1079ELANTECH_INT_ATTR(paritycheck, 0);
1080
1081static struct attribute *elantech_attrs[] = {
1dc6edec 1082 &psmouse_attr_reg_07.dattr.attr,
2a0bd75e
AO		 1083 &psmouse_attr_reg_10.dattr.attr,
1084 &psmouse_attr_reg_11.dattr.attr,
1085 &psmouse_attr_reg_20.dattr.attr,
1086 &psmouse_attr_reg_21.dattr.attr,
1087 &psmouse_attr_reg_22.dattr.attr,
1088 &psmouse_attr_reg_23.dattr.attr,
1089 &psmouse_attr_reg_24.dattr.attr,
1090 &psmouse_attr_reg_25.dattr.attr,
1091 &psmouse_attr_reg_26.dattr.attr,
1092 &psmouse_attr_debug.dattr.attr,
1093 &psmouse_attr_paritycheck.dattr.attr,
1094 NULL
1095};
1096
1097static struct attribute_group elantech_attr_group = {
1098 .attrs = elantech_attrs,
1099};
1100
a083632e
DT		 1101static bool elantech_is_signature_valid(const unsigned char *param)
1102{
1103 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1104 int i;
1105
1106 if (param[0] == 0)
1107 return false;
1108
1109 if (param[1] == 0)
1110 return true;
1111
1112 for (i = 0; i < ARRAY_SIZE(rates); i++)
1113 if (param[2] == rates[i])
1114 return false;
1115
1116 return true;
1117}
1118
2a0bd75e
AO		 1119/*
1120 * Use magic knock to detect Elantech touchpad
1121 */
b7802c5c 1122int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 1123{
1124 struct ps2dev *ps2dev = &psmouse->ps2dev;
1125 unsigned char param[3];
1126
1127 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1128
1129 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1130 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1131 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1132 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1133 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
d4ae84a8 1134 pr_debug("sending Elantech magic knock failed.\n");
2a0bd75e
AO		 1135 return -1;
1136 }
1137
1138 /*
1139 * Report this in case there are Elantech models that use a different
1140 * set of magic numbers
1141 */
28f49616
JD		 1142 if (param[0] != 0x3c || param[1] != 0x03 ||
1143 (param[2] != 0xc8 && param[2] != 0x00)) {
d4ae84a8 1144 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 1145 param[0], param[1], param[2]);
1146 return -1;
1147 }
1148
1149 /*
1150 * Query touchpad's firmware version and see if it reports known
1151 * value to avoid mis-detection. Logitech mice are known to respond
1152 * to Elantech magic knock and there might be more.
1153 */
1154 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 1155 pr_debug("failed to query firmware version.\n");
9ab7b25e
AO		 1156 return -1;
1157 }
1158
d4ae84a8 1159 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 1160 param[0], param[1], param[2]);
1161
a083632e 1162 if (!elantech_is_signature_valid(param)) {
4af61e90
JD		 1163 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
1164 return -1;
2a0bd75e
AO		 1165 }
1166
1167 if (set_properties) {
1168 psmouse->vendor = "Elantech";
1169 psmouse->name = "Touchpad";
1170 }
1171
1172 return 0;
1173}
1174
1175/*
1176 * Clean up sysfs entries when disconnecting
1177 */
1178static void elantech_disconnect(struct psmouse *psmouse)
1179{
1180 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1181 &elantech_attr_group);
1182 kfree(psmouse->private);
1183 psmouse->private = NULL;
1184}
1185
1186/*
1187 * Put the touchpad back into absolute mode when reconnecting
1188 */
1189static int elantech_reconnect(struct psmouse *psmouse)
1190{
1191 if (elantech_detect(psmouse, 0))
1192 return -1;
1193
1194 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 1195 pr_err("failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 1196 return -1;
1197 }
1198
1199 return 0;
1200}
1201
3c8bbb95
JD		 1202/*
1203 * determine hardware version and set some properties according to it.
1204 */
28f49616 1205static int elantech_set_properties(struct elantech_data *etd)
3c8bbb95 1206{
1dc6edec
JD		 1207 int ver = (etd->fw_version & 0x0f0000) >> 16;
1208
3c8bbb95
JD		 1209 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1210 etd->hw_version = 1;
28f49616 1211 else if (etd->fw_version < 0x150600)
3c8bbb95 1212 etd->hw_version = 2;
1dc6edec 1213 else if (ver == 5)
28f49616 1214 etd->hw_version = 3;
1dc6edec
JD		 1215 else if (ver == 6)
1216 etd->hw_version = 4;
28f49616
JD		 1217 else
1218 return -1;
3c8bbb95
JD		 1219
1220 /*
1221 * Turn on packet checking by default.
1222 */
1223 etd->paritycheck = 1;
1224
1225 /*
1226 * This firmware suffers from misreporting coordinates when
1227 * a touch action starts causing the mouse cursor or scrolled page
1228 * to jump. Enable a workaround.
1229 */
1230 etd->jumpy_cursor =
1231 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1232
28f49616 1233 if (etd->hw_version > 1) {
3c8bbb95
JD		 1234 /* For now show extra debug information */
1235 etd->debug = 1;
1236
1237 if (etd->fw_version >= 0x020800)
1238 etd->reports_pressure = true;
1239 }
28f49616
JD		 1240
1241 return 0;
3c8bbb95
JD		 1242}
1243
2a0bd75e
AO		 1244/*
1245 * Initialize the touchpad and create sysfs entries
1246 */
1247int elantech_init(struct psmouse *psmouse)
1248{
1249 struct elantech_data *etd;
1250 int i, error;
1251 unsigned char param[3];
1252
9ab7b25e 1253 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 1254 if (!etd)
6792cbbb 1255 return -ENOMEM;
2a0bd75e
AO		 1256
1257 etd->parity[0] = 1;
1258 for (i = 1; i < 256; i++)
1259 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1260
1261 /*
9ab7b25e 1262 * Do the version query again so we can store the result
2a0bd75e
AO		 1263 */
1264 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 1265 pr_err("failed to query firmware version.\n");
2a0bd75e
AO		 1266 goto init_fail;
1267 }
504e8bee 1268 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
28f49616
JD		 1269
1270 if (elantech_set_properties(etd)) {
1271 pr_err("unknown hardware version, aborting...\n");
1272 goto init_fail;
1273 }
3c8bbb95
JD		 1274 pr_info("assuming hardware version %d "
1275 "(with firmware version 0x%02x%02x%02x)\n",
504e8bee 1276 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 1277
230282a7
JD		 1278 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1279 etd->capabilities)) {
d4ae84a8 1280 pr_err("failed to query capabilities.\n");
2a0bd75e
AO		 1281 goto init_fail;
1282 }
d4ae84a8 1283 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
230282a7
JD		 1284 etd->capabilities[0], etd->capabilities[1],
1285 etd->capabilities[2]);
2a0bd75e
AO		 1286
1287 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 1288 pr_err("failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 1289 goto init_fail;
1290 }
1291
28f49616
JD		 1292 if (elantech_set_input_params(psmouse)) {
1293 pr_err("failed to query touchpad range.\n");
1294 goto init_fail;
1295 }
2a0bd75e
AO		 1296
1297 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1298 &elantech_attr_group);
1299 if (error) {
d4ae84a8 1300 pr_err("failed to create sysfs attributes, error: %d.\n", error);
2a0bd75e
AO		 1301 goto init_fail;
1302 }
1303
1304 psmouse->protocol_handler = elantech_process_byte;
1305 psmouse->disconnect = elantech_disconnect;
1306 psmouse->reconnect = elantech_reconnect;
28f49616 1307 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
2a0bd75e
AO		 1308
1309 return 0;
1310
1311 init_fail:
1312 kfree(etd);
1313 return -1;
1314}
Linux kernel - Deliverables
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