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Input: elantech - add v4 hardware support
[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
1dc6edec 87 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 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;
28f49616 111
1dc6edec 112 case 3 ... 4:
28f49616
JD		 113 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
114 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
115 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
116 elantech_ps2_command(psmouse, NULL, reg) ||
117 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
118 rc = -1;
119 }
120 break;
2a0bd75e
AO		 121 }
122
123 if (rc)
d4ae84a8 124 pr_err("failed to read register 0x%02x.\n", reg);
1dc6edec 125 else if (etd->hw_version != 4)
2a0bd75e 126 *val = param[0];
1dc6edec
JD		 127 else
128 *val = param[1];
2a0bd75e
AO		 129
130 return rc;
131}
132
133/*
134 * Send an Elantech style special command to write a register with a value
135 */
136static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
137 unsigned char val)
138{
139 struct elantech_data *etd = psmouse->private;
140 int rc = 0;
141
1dc6edec 142 if (reg < 0x07 || reg > 0x26)
2a0bd75e
AO		 143 return -1;
144
145 if (reg > 0x11 && reg < 0x20)
146 return -1;
147
148 switch (etd->hw_version) {
149 case 1:
150 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
151 psmouse_sliced_command(psmouse, reg) ||
152 psmouse_sliced_command(psmouse, val) ||
153 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
154 rc = -1;
155 }
156 break;
157
158 case 2:
159 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
160 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
161 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
162 elantech_ps2_command(psmouse, NULL, reg) ||
163 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
164 elantech_ps2_command(psmouse, NULL, val) ||
165 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
166 rc = -1;
167 }
168 break;
28f49616
JD		 169
170 case 3:
171 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
172 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
173 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
174 elantech_ps2_command(psmouse, NULL, reg) ||
175 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
176 elantech_ps2_command(psmouse, NULL, val) ||
177 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
178 rc = -1;
179 }
180 break;
1dc6edec
JD		 181
182 case 4:
183 if (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, reg) ||
187 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
188 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
189 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
190 elantech_ps2_command(psmouse, NULL, val) ||
191 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
192 rc = -1;
193 }
194 break;
2a0bd75e
AO		 195 }
196
197 if (rc)
d4ae84a8 198 pr_err("failed to write register 0x%02x with value 0x%02x.\n",
2a0bd75e
AO		 199 reg, val);
200
201 return rc;
202}
203
204/*
205 * Dump a complete mouse movement packet to the syslog
206 */
207static void elantech_packet_dump(unsigned char *packet, int size)
208{
209 int i;
210
d4ae84a8 211 printk(KERN_DEBUG pr_fmt("PS/2 packet ["));
2a0bd75e
AO		 212 for (i = 0; i < size; i++)
213 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
214 printk("]\n");
215}
216
217/*
218 * Interpret complete data packets and report absolute mode input events for
219 * hardware version 1. (4 byte packets)
220 */
221static void elantech_report_absolute_v1(struct psmouse *psmouse)
222{
223 struct input_dev *dev = psmouse->dev;
224 struct elantech_data *etd = psmouse->private;
225 unsigned char *packet = psmouse->packet;
226 int fingers;
227
504e8bee 228 if (etd->fw_version < 0x020000) {
e938fbfd
FR		 229 /*
230 * byte 0: D U p1 p2 1 p3 R L
231 * byte 1: f 0 th tw x9 x8 y9 y8
232 */
2a0bd75e
AO		 233 fingers = ((packet[1] & 0x80) >> 7) +
234 ((packet[1] & 0x30) >> 4);
235 } else {
e938fbfd
FR		 236 /*
237 * byte 0: n1 n0 p2 p1 1 p3 R L
238 * byte 1: 0 0 0 0 x9 x8 y9 y8
239 */
2a0bd75e
AO		 240 fingers = (packet[0] & 0xc0) >> 6;
241 }
242
3f8c0df4 243 if (etd->jumpy_cursor) {
7f29f17b
ÉP		 244 if (fingers != 1) {
245 etd->single_finger_reports = 0;
246 } else if (etd->single_finger_reports < 2) {
247 /* Discard first 2 reports of one finger, bogus */
248 etd->single_finger_reports++;
d4ae84a8 249 elantech_debug("discarding packet\n");
7f29f17b 250 return;
3f8c0df4
AO		 251 }
252 }
253
2a0bd75e
AO		 254 input_report_key(dev, BTN_TOUCH, fingers != 0);
255
e938fbfd
FR		 256 /*
257 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
258 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
259 */
2a0bd75e
AO		 260 if (fingers) {
261 input_report_abs(dev, ABS_X,
262 ((packet[1] & 0x0c) << 6) | packet[2]);
e938fbfd 263 input_report_abs(dev, ABS_Y,
230282a7 264 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
2a0bd75e
AO		 265 }
266
267 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
268 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
269 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
270 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
271 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
272
504e8bee 273 if (etd->fw_version < 0x020000 &&
230282a7 274 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 275 /* rocker up */
276 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
277 /* rocker down */
278 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
279 }
280
281 input_sync(dev);
282}
283
89eec4d7
ÉP		 284static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
285 unsigned int x, unsigned int y)
286{
287 input_mt_slot(dev, slot);
288 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
289 if (active) {
290 input_report_abs(dev, ABS_MT_POSITION_X, x);
291 input_report_abs(dev, ABS_MT_POSITION_Y, y);
292 }
293}
294
295/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
296static void elantech_report_semi_mt_data(struct input_dev *dev,
297 unsigned int num_fingers,
298 unsigned int x1, unsigned int y1,
299 unsigned int x2, unsigned int y2)
300{
301 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
302 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
303}
304
2a0bd75e
AO		 305/*
306 * Interpret complete data packets and report absolute mode input events for
307 * hardware version 2. (6 byte packets)
308 */
309static void elantech_report_absolute_v2(struct psmouse *psmouse)
310{
f941c705 311 struct elantech_data *etd = psmouse->private;
2a0bd75e
AO		 312 struct input_dev *dev = psmouse->dev;
313 unsigned char *packet = psmouse->packet;
461a7917
JD		 314 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
315 unsigned int width = 0, pres = 0;
2a0bd75e
AO		 316
317 /* byte 0: n1 n0 . . . . R L */
318 fingers = (packet[0] & 0xc0) >> 6;
2a0bd75e
AO		 319
320 switch (fingers) {
22462d9f
ÉP		 321 case 3:
322 /*
323 * Same as one finger, except report of more than 3 fingers:
324 * byte 3: n4 . w1 w0 . . . .
325 */
326 if (packet[3] & 0x80)
327 fingers = 4;
328 /* pass through... */
2a0bd75e 329 case 1:
e938fbfd 330 /*
11559619 331 * byte 1: . . . . x11 x10 x9 x8
e938fbfd
FR		 332 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
333 */
11559619 334 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
e938fbfd 335 /*
11559619 336 * byte 4: . . . . y11 y10 y9 y8
e938fbfd
FR		 337 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
338 */
230282a7 339 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
89eec4d7 340
f941c705
ÉP		 341 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
342 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
2a0bd75e
AO		 343 break;
344
345 case 2:
e938fbfd
FR		 346 /*
347 * The coordinate of each finger is reported separately
348 * with a lower resolution for two finger touches:
349 * byte 0: . . ay8 ax8 . . . .
350 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
351 */
461a7917 352 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
2a0bd75e 353 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
230282a7 354 y1 = etd->y_max -
461a7917 355 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
e938fbfd
FR		 356 /*
357 * byte 3: . . by8 bx8 . . . .
358 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
359 */
461a7917 360 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
2a0bd75e 361 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
230282a7 362 y2 = etd->y_max -
461a7917 363 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
f941c705
ÉP		 364
365 /* Unknown so just report sensible values */
366 pres = 127;
367 width = 7;
2a0bd75e
AO		 368 break;
369 }
370
461a7917
JD		 371 input_report_key(dev, BTN_TOUCH, fingers != 0);
372 if (fingers != 0) {
373 input_report_abs(dev, ABS_X, x1);
374 input_report_abs(dev, ABS_Y, y1);
375 }
89eec4d7 376 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
2a0bd75e
AO		 377 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
378 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
379 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
22462d9f 380 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
2a0bd75e
AO		 381 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
382 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
f941c705
ÉP		 383 if (etd->reports_pressure) {
384 input_report_abs(dev, ABS_PRESSURE, pres);
385 input_report_abs(dev, ABS_TOOL_WIDTH, width);
386 }
2a0bd75e
AO		 387
388 input_sync(dev);
389}
390
28f49616
JD		 391/*
392 * Interpret complete data packets and report absolute mode input events for
393 * hardware version 3. (12 byte packets for two fingers)
394 */
395static void elantech_report_absolute_v3(struct psmouse *psmouse,
396 int packet_type)
397{
398 struct input_dev *dev = psmouse->dev;
399 struct elantech_data *etd = psmouse->private;
400 unsigned char *packet = psmouse->packet;
401 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
402 unsigned int width = 0, pres = 0;
403
404 /* byte 0: n1 n0 . . . . R L */
405 fingers = (packet[0] & 0xc0) >> 6;
406
407 switch (fingers) {
408 case 3:
409 case 1:
410 /*
411 * byte 1: . . . . x11 x10 x9 x8
412 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
413 */
414 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
415 /*
416 * byte 4: . . . . y11 y10 y9 y8
417 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
418 */
419 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
420 break;
421
422 case 2:
423 if (packet_type == PACKET_V3_HEAD) {
424 /*
425 * byte 1: . . . . ax11 ax10 ax9 ax8
426 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
427 */
1dc6edec 428 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
28f49616
JD		 429 /*
430 * byte 4: . . . . ay11 ay10 ay9 ay8
431 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
432 */
1dc6edec 433 etd->mt[0].y = etd->y_max -
28f49616
JD		 434 (((packet[4] & 0x0f) << 8) | packet[5]);
435 /*
436 * wait for next packet
437 */
438 return;
439 }
440
441 /* packet_type == PACKET_V3_TAIL */
1dc6edec
JD		 442 x1 = etd->mt[0].x;
443 y1 = etd->mt[0].y;
28f49616
JD		 444 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
445 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
446 break;
447 }
448
449 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
450 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
451
452 input_report_key(dev, BTN_TOUCH, fingers != 0);
453 if (fingers != 0) {
454 input_report_abs(dev, ABS_X, x1);
455 input_report_abs(dev, ABS_Y, y1);
456 }
457 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
458 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
459 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
460 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
461 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
462 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
463 input_report_abs(dev, ABS_PRESSURE, pres);
464 input_report_abs(dev, ABS_TOOL_WIDTH, width);
465
466 input_sync(dev);
467}
468
1dc6edec
JD		 469static void elantech_input_sync_v4(struct psmouse *psmouse)
470{
471 struct input_dev *dev = psmouse->dev;
472 unsigned char *packet = psmouse->packet;
473
474 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
475 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
476 input_mt_report_pointer_emulation(dev, true);
477 input_sync(dev);
478}
479
480static void process_packet_status_v4(struct psmouse *psmouse)
481{
482 struct input_dev *dev = psmouse->dev;
483 unsigned char *packet = psmouse->packet;
484 unsigned fingers;
485 int i;
486
487 /* notify finger state change */
488 fingers = packet[1] & 0x1f;
489 for (i = 0; i < ETP_MAX_FINGERS; i++) {
490 if ((fingers & (1 << i)) == 0) {
491 input_mt_slot(dev, i);
492 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
493 }
494 }
495
496 elantech_input_sync_v4(psmouse);
497}
498
499static void process_packet_head_v4(struct psmouse *psmouse)
500{
501 struct input_dev *dev = psmouse->dev;
502 struct elantech_data *etd = psmouse->private;
503 unsigned char *packet = psmouse->packet;
504 int id = ((packet[3] & 0xe0) >> 5) - 1;
505 int pres, traces;
506
507 if (id < 0)
508 return;
509
510 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
511 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
512 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
513 traces = (packet[0] & 0xf0) >> 4;
514
515 input_mt_slot(dev, id);
516 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
517
518 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
519 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
520 input_report_abs(dev, ABS_MT_PRESSURE, pres);
521 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
522 /* report this for backwards compatibility */
523 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
524
525 elantech_input_sync_v4(psmouse);
526}
527
528static void process_packet_motion_v4(struct psmouse *psmouse)
529{
530 struct input_dev *dev = psmouse->dev;
531 struct elantech_data *etd = psmouse->private;
532 unsigned char *packet = psmouse->packet;
533 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
534 int id, sid;
535
536 id = ((packet[0] & 0xe0) >> 5) - 1;
537 if (id < 0)
538 return;
539
540 sid = ((packet[3] & 0xe0) >> 5) - 1;
541 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
542 /*
543 * Motion packets give us the delta of x, y values of specific fingers,
544 * but in two's complement. Let the compiler do the conversion for us.
545 * Also _enlarge_ the numbers to int, in case of overflow.
546 */
547 delta_x1 = (signed char)packet[1];
548 delta_y1 = (signed char)packet[2];
549 delta_x2 = (signed char)packet[4];
550 delta_y2 = (signed char)packet[5];
551
552 etd->mt[id].x += delta_x1 * weight;
553 etd->mt[id].y -= delta_y1 * weight;
554 input_mt_slot(dev, id);
555 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
556 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
557
558 if (sid >= 0) {
559 etd->mt[sid].x += delta_x2 * weight;
560 etd->mt[sid].y -= delta_y2 * weight;
561 input_mt_slot(dev, sid);
562 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
563 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
564 }
565
566 elantech_input_sync_v4(psmouse);
567}
568
569static void elantech_report_absolute_v4(struct psmouse *psmouse,
570 int packet_type)
571{
572 switch (packet_type) {
573 case PACKET_V4_STATUS:
574 process_packet_status_v4(psmouse);
575 break;
576
577 case PACKET_V4_HEAD:
578 process_packet_head_v4(psmouse);
579 break;
580
581 case PACKET_V4_MOTION:
582 process_packet_motion_v4(psmouse);
583 break;
584
585 case PACKET_UNKNOWN:
586 default:
587 /* impossible to get here */
588 break;
589 }
590}
591
7894f21b 592static int elantech_packet_check_v1(struct psmouse *psmouse)
2a0bd75e
AO		 593{
594 struct elantech_data *etd = psmouse->private;
595 unsigned char *packet = psmouse->packet;
596 unsigned char p1, p2, p3;
597
598 /* Parity bits are placed differently */
504e8bee 599 if (etd->fw_version < 0x020000) {
2a0bd75e
AO		 600 /* byte 0: D U p1 p2 1 p3 R L */
601 p1 = (packet[0] & 0x20) >> 5;
602 p2 = (packet[0] & 0x10) >> 4;
603 } else {
604 /* byte 0: n1 n0 p2 p1 1 p3 R L */
605 p1 = (packet[0] & 0x10) >> 4;
606 p2 = (packet[0] & 0x20) >> 5;
607 }
608
609 p3 = (packet[0] & 0x04) >> 2;
610
611 return etd->parity[packet[1]] == p1 &&
612 etd->parity[packet[2]] == p2 &&
613 etd->parity[packet[3]] == p3;
614}
615
7894f21b
JD		 616static int elantech_packet_check_v2(struct psmouse *psmouse)
617{
618 struct elantech_data *etd = psmouse->private;
619 unsigned char *packet = psmouse->packet;
620
621 /*
622 * V2 hardware has two flavors. Older ones that do not report pressure,
623 * and newer ones that reports pressure and width. With newer ones, all
624 * packets (1, 2, 3 finger touch) have the same constant bits. With
625 * older ones, 1/3 finger touch packets and 2 finger touch packets
626 * have different constant bits.
627 * With all three cases, if the constant bits are not exactly what I
628 * expected, I consider them invalid.
629 */
630 if (etd->reports_pressure)
631 return (packet[0] & 0x0c) == 0x04 &&
632 (packet[3] & 0x0f) == 0x02;
633
634 if ((packet[0] & 0xc0) == 0x80)
635 return (packet[0] & 0x0c) == 0x0c &&
636 (packet[3] & 0x0e) == 0x08;
637
638 return (packet[0] & 0x3c) == 0x3c &&
639 (packet[1] & 0xf0) == 0x00 &&
640 (packet[3] & 0x3e) == 0x38 &&
641 (packet[4] & 0xf0) == 0x00;
642}
643
28f49616
JD		 644/*
645 * We check the constant bits to determine what packet type we get,
1dc6edec 646 * so packet checking is mandatory for v3 and later hardware.
28f49616
JD		 647 */
648static int elantech_packet_check_v3(struct psmouse *psmouse)
649{
650 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
651 unsigned char *packet = psmouse->packet;
652
653 /*
654 * check debounce first, it has the same signature in byte 0
655 * and byte 3 as PACKET_V3_HEAD.
656 */
657 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
658 return PACKET_DEBOUNCE;
659
660 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
661 return PACKET_V3_HEAD;
662
663 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
664 return PACKET_V3_TAIL;
665
666 return PACKET_UNKNOWN;
667}
668
1dc6edec
JD		 669static int elantech_packet_check_v4(struct psmouse *psmouse)
670{
671 unsigned char *packet = psmouse->packet;
672
673 if ((packet[0] & 0x0c) == 0x04 &&
674 (packet[3] & 0x1f) == 0x11)
675 return PACKET_V4_HEAD;
676
677 if ((packet[0] & 0x0c) == 0x04 &&
678 (packet[3] & 0x1f) == 0x12)
679 return PACKET_V4_MOTION;
680
681 if ((packet[0] & 0x0c) == 0x04 &&
682 (packet[3] & 0x1f) == 0x10)
683 return PACKET_V4_STATUS;
684
685 return PACKET_UNKNOWN;
686}
687
2a0bd75e
AO		 688/*
689 * Process byte stream from mouse and handle complete packets
690 */
691static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
692{
693 struct elantech_data *etd = psmouse->private;
28f49616 694 int packet_type;
2a0bd75e
AO		 695
696 if (psmouse->pktcnt < psmouse->pktsize)
697 return PSMOUSE_GOOD_DATA;
698
699 if (etd->debug > 1)
700 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
701
702 switch (etd->hw_version) {
703 case 1:
7894f21b 704 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
2a0bd75e
AO		 705 return PSMOUSE_BAD_DATA;
706
707 elantech_report_absolute_v1(psmouse);
708 break;
709
710 case 2:
7894f21b
JD		 711 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
712 return PSMOUSE_BAD_DATA;
713
2a0bd75e
AO		 714 elantech_report_absolute_v2(psmouse);
715 break;
28f49616
JD		 716
717 case 3:
718 packet_type = elantech_packet_check_v3(psmouse);
719 /* ignore debounce */
720 if (packet_type == PACKET_DEBOUNCE)
721 return PSMOUSE_FULL_PACKET;
722
723 if (packet_type == PACKET_UNKNOWN)
724 return PSMOUSE_BAD_DATA;
725
726 elantech_report_absolute_v3(psmouse, packet_type);
727 break;
1dc6edec
JD		 728
729 case 4:
730 packet_type = elantech_packet_check_v4(psmouse);
731 if (packet_type == PACKET_UNKNOWN)
732 return PSMOUSE_BAD_DATA;
733
734 elantech_report_absolute_v4(psmouse, packet_type);
735 break;
2a0bd75e
AO		 736 }
737
738 return PSMOUSE_FULL_PACKET;
739}
740
741/*
742 * Put the touchpad into absolute mode
743 */
744static int elantech_set_absolute_mode(struct psmouse *psmouse)
745{
746 struct elantech_data *etd = psmouse->private;
747 unsigned char val;
748 int tries = ETP_READ_BACK_TRIES;
749 int rc = 0;
750
751 switch (etd->hw_version) {
752 case 1:
753 etd->reg_10 = 0x16;
754 etd->reg_11 = 0x8f;
755 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
756 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
757 rc = -1;
758 }
759 break;
760
761 case 2:
762 /* Windows driver values */
763 etd->reg_10 = 0x54;
764 etd->reg_11 = 0x88; /* 0x8a */
765 etd->reg_21 = 0x60; /* 0x00 */
766 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
767 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
768 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
769 rc = -1;
2a0bd75e 770 }
28f49616
JD		 771 break;
772
773 case 3:
774 etd->reg_10 = 0x0b;
775 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
776 rc = -1;
777
778 break;
1dc6edec
JD		 779
780 case 4:
781 etd->reg_07 = 0x01;
782 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
783 rc = -1;
784
785 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
b2546df6
AO		 786 }
787
788 if (rc == 0) {
2a0bd75e 789 /*
b2546df6
AO		 790 * Read back reg 0x10. For hardware version 1 we must make
791 * sure the absolute mode bit is set. For hardware version 2
792 * the touchpad is probably initalising and not ready until
793 * we read back the value we just wrote.
2a0bd75e
AO		 794 */
795 do {
796 rc = elantech_read_reg(psmouse, 0x10, &val);
797 if (rc == 0)
798 break;
799 tries--;
d4ae84a8 800 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 801 msleep(ETP_READ_BACK_DELAY);
802 } while (tries > 0);
b2546df6
AO		 803
804 if (rc) {
d4ae84a8 805 pr_err("failed to read back register 0x10.\n");
b2546df6
AO		 806 } else if (etd->hw_version == 1 &&
807 !(val & ETP_R10_ABSOLUTE_MODE)) {
d4ae84a8 808 pr_err("touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 809 rc = -1;
810 }
2a0bd75e
AO		 811 }
812
1dc6edec 813 skip_readback_reg_10:
2a0bd75e 814 if (rc)
d4ae84a8 815 pr_err("failed to initialise registers.\n");
2a0bd75e
AO		 816
817 return rc;
818}
819
28f49616
JD		 820static int elantech_set_range(struct psmouse *psmouse,
821 unsigned int *x_min, unsigned int *y_min,
1dc6edec
JD		 822 unsigned int *x_max, unsigned int *y_max,
823 unsigned int *width)
230282a7
JD		 824{
825 struct elantech_data *etd = psmouse->private;
28f49616 826 unsigned char param[3];
1dc6edec 827 unsigned char traces;
230282a7
JD		 828 int i;
829
830 switch (etd->hw_version) {
831 case 1:
832 *x_min = ETP_XMIN_V1;
833 *y_min = ETP_YMIN_V1;
834 *x_max = ETP_XMAX_V1;
835 *y_max = ETP_YMAX_V1;
836 break;
837
838 case 2:
839 if (etd->fw_version == 0x020800 ||
840 etd->fw_version == 0x020b00 ||
841 etd->fw_version == 0x020030) {
842 *x_min = ETP_XMIN_V2;
843 *y_min = ETP_YMIN_V2;
844 *x_max = ETP_XMAX_V2;
845 *y_max = ETP_YMAX_V2;
846 } else {
847 i = (etd->fw_version > 0x020800 &&
848 etd->fw_version < 0x020900) ? 1 : 2;
849 *x_min = 0;
850 *y_min = 0;
851 *x_max = (etd->capabilities[1] - i) * 64;
852 *y_max = (etd->capabilities[2] - i) * 64;
853 }
854 break;
28f49616
JD		 855
856 case 3:
857 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
858 return -1;
859
860 *x_max = (0x0f & param[0]) << 8 | param[1];
861 *y_max = (0xf0 & param[0]) << 4 | param[2];
862 break;
1dc6edec
JD		 863
864 case 4:
865 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
866 return -1;
867
868 *x_max = (0x0f & param[0]) << 8 | param[1];
869 *y_max = (0xf0 & param[0]) << 4 | param[2];
870 traces = etd->capabilities[1];
871 if ((traces < 2) || (traces > *x_max))
872 return -1;
873
874 *width = *x_max / (traces - 1);
875 break;
230282a7 876 }
28f49616
JD		 877
878 return 0;
230282a7
JD		 879}
880
2a0bd75e
AO		 881/*
882 * Set the appropriate event bits for the input subsystem
883 */
28f49616 884static int elantech_set_input_params(struct psmouse *psmouse)
2a0bd75e
AO		 885{
886 struct input_dev *dev = psmouse->dev;
887 struct elantech_data *etd = psmouse->private;
1dc6edec 888 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
230282a7 889
1dc6edec 890 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
28f49616 891 return -1;
2a0bd75e
AO		 892
893 __set_bit(EV_KEY, dev->evbit);
894 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 895 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 896
897 __set_bit(BTN_LEFT, dev->keybit);
898 __set_bit(BTN_RIGHT, dev->keybit);
899
900 __set_bit(BTN_TOUCH, dev->keybit);
901 __set_bit(BTN_TOOL_FINGER, dev->keybit);
902 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
903 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
904
905 switch (etd->hw_version) {
906 case 1:
907 /* Rocker button */
504e8bee 908 if (etd->fw_version < 0x020000 &&
230282a7 909 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 910 __set_bit(BTN_FORWARD, dev->keybit);
911 __set_bit(BTN_BACK, dev->keybit);
912 }
230282a7
JD		 913 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
914 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 915 break;
916
917 case 2:
22462d9f 918 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
28f49616
JD		 919 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
920 /* fall through */
921 case 3:
230282a7
JD		 922 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
923 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 924 if (etd->reports_pressure) {
925 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
926 ETP_PMAX_V2, 0, 0);
927 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
928 ETP_WMAX_V2, 0, 0);
929 }
89eec4d7 930 input_mt_init_slots(dev, 2);
230282a7
JD		 931 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
932 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e 933 break;
1dc6edec
JD		 934
935 case 4:
936 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
937 /* For X to recognize me as touchpad. */
938 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
939 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
940 /*
941 * range of pressure and width is the same as v2,
942 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
943 */
944 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
945 ETP_PMAX_V2, 0, 0);
946 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
947 ETP_WMAX_V2, 0, 0);
948 /* Multitouch capable pad, up to 5 fingers. */
949 input_mt_init_slots(dev, ETP_MAX_FINGERS);
950 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
951 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
952 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
953 ETP_PMAX_V2, 0, 0);
954 /*
955 * The firmware reports how many trace lines the finger spans,
956 * convert to surface unit as Protocol-B requires.
957 */
958 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
959 ETP_WMAX_V2 * width, 0, 0);
960 break;
2a0bd75e 961 }
230282a7
JD		 962
963 etd->y_max = y_max;
1dc6edec 964 etd->width = width;
28f49616
JD		 965
966 return 0;
2a0bd75e
AO		 967}
968
969struct elantech_attr_data {
970 size_t field_offset;
971 unsigned char reg;
972};
973
974/*
975 * Display a register value by reading a sysfs entry
976 */
977static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
978 char *buf)
979{
980 struct elantech_data *etd = psmouse->private;
981 struct elantech_attr_data *attr = data;
982 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
983 int rc = 0;
984
985 if (attr->reg)
986 rc = elantech_read_reg(psmouse, attr->reg, reg);
987
988 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
989}
990
991/*
992 * Write a register value by writing a sysfs entry
993 */
994static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
995 void *data, const char *buf, size_t count)
996{
997 struct elantech_data *etd = psmouse->private;
998 struct elantech_attr_data *attr = data;
999 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1000 unsigned long value;
1001 int err;
1002
1003 err = strict_strtoul(buf, 16, &value);
1004 if (err)
1005 return err;
1006
1007 if (value > 0xff)
1008 return -EINVAL;
1009
1010 /* Do we need to preserve some bits for version 2 hardware too? */
1011 if (etd->hw_version == 1) {
1012 if (attr->reg == 0x10)
1013 /* Force absolute mode always on */
1014 value |= ETP_R10_ABSOLUTE_MODE;
1015 else if (attr->reg == 0x11)
1016 /* Force 4 byte mode always on */
1017 value |= ETP_R11_4_BYTE_MODE;
1018 }
1019
1020 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1021 *reg = value;
1022
1023 return count;
1024}
1025
1026#define ELANTECH_INT_ATTR(_name, _register) \
1027 static struct elantech_attr_data elantech_attr_##_name = { \
1028 .field_offset = offsetof(struct elantech_data, _name), \
1029 .reg = _register, \
1030 }; \
1031 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1032 &elantech_attr_##_name, \
1033 elantech_show_int_attr, \
1034 elantech_set_int_attr)
1035
1dc6edec 1036ELANTECH_INT_ATTR(reg_07, 0x07);
2a0bd75e
AO		 1037ELANTECH_INT_ATTR(reg_10, 0x10);
1038ELANTECH_INT_ATTR(reg_11, 0x11);
1039ELANTECH_INT_ATTR(reg_20, 0x20);
1040ELANTECH_INT_ATTR(reg_21, 0x21);
1041ELANTECH_INT_ATTR(reg_22, 0x22);
1042ELANTECH_INT_ATTR(reg_23, 0x23);
1043ELANTECH_INT_ATTR(reg_24, 0x24);
1044ELANTECH_INT_ATTR(reg_25, 0x25);
1045ELANTECH_INT_ATTR(reg_26, 0x26);
1046ELANTECH_INT_ATTR(debug, 0);
1047ELANTECH_INT_ATTR(paritycheck, 0);
1048
1049static struct attribute *elantech_attrs[] = {
1dc6edec 1050 &psmouse_attr_reg_07.dattr.attr,
2a0bd75e
AO		 1051 &psmouse_attr_reg_10.dattr.attr,
1052 &psmouse_attr_reg_11.dattr.attr,
1053 &psmouse_attr_reg_20.dattr.attr,
1054 &psmouse_attr_reg_21.dattr.attr,
1055 &psmouse_attr_reg_22.dattr.attr,
1056 &psmouse_attr_reg_23.dattr.attr,
1057 &psmouse_attr_reg_24.dattr.attr,
1058 &psmouse_attr_reg_25.dattr.attr,
1059 &psmouse_attr_reg_26.dattr.attr,
1060 &psmouse_attr_debug.dattr.attr,
1061 &psmouse_attr_paritycheck.dattr.attr,
1062 NULL
1063};
1064
1065static struct attribute_group elantech_attr_group = {
1066 .attrs = elantech_attrs,
1067};
1068
a083632e
DT		 1069static bool elantech_is_signature_valid(const unsigned char *param)
1070{
1071 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1072 int i;
1073
1074 if (param[0] == 0)
1075 return false;
1076
1077 if (param[1] == 0)
1078 return true;
1079
1080 for (i = 0; i < ARRAY_SIZE(rates); i++)
1081 if (param[2] == rates[i])
1082 return false;
1083
1084 return true;
1085}
1086
2a0bd75e
AO		 1087/*
1088 * Use magic knock to detect Elantech touchpad
1089 */
b7802c5c 1090int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 1091{
1092 struct ps2dev *ps2dev = &psmouse->ps2dev;
1093 unsigned char param[3];
1094
1095 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1096
1097 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1098 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1099 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1100 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1101 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
d4ae84a8 1102 pr_debug("sending Elantech magic knock failed.\n");
2a0bd75e
AO		 1103 return -1;
1104 }
1105
1106 /*
1107 * Report this in case there are Elantech models that use a different
1108 * set of magic numbers
1109 */
28f49616
JD		 1110 if (param[0] != 0x3c || param[1] != 0x03 ||
1111 (param[2] != 0xc8 && param[2] != 0x00)) {
d4ae84a8 1112 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 1113 param[0], param[1], param[2]);
1114 return -1;
1115 }
1116
1117 /*
1118 * Query touchpad's firmware version and see if it reports known
1119 * value to avoid mis-detection. Logitech mice are known to respond
1120 * to Elantech magic knock and there might be more.
1121 */
1122 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 1123 pr_debug("failed to query firmware version.\n");
9ab7b25e
AO		 1124 return -1;
1125 }
1126
d4ae84a8 1127 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 1128 param[0], param[1], param[2]);
1129
a083632e 1130 if (!elantech_is_signature_valid(param)) {
f81bc788 1131 if (!force_elantech) {
d4ae84a8 1132 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
f81bc788
FR		 1133 return -1;
1134 }
1135
d4ae84a8 1136 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
2a0bd75e
AO		 1137 }
1138
1139 if (set_properties) {
1140 psmouse->vendor = "Elantech";
1141 psmouse->name = "Touchpad";
1142 }
1143
1144 return 0;
1145}
1146
1147/*
1148 * Clean up sysfs entries when disconnecting
1149 */
1150static void elantech_disconnect(struct psmouse *psmouse)
1151{
1152 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1153 &elantech_attr_group);
1154 kfree(psmouse->private);
1155 psmouse->private = NULL;
1156}
1157
1158/*
1159 * Put the touchpad back into absolute mode when reconnecting
1160 */
1161static int elantech_reconnect(struct psmouse *psmouse)
1162{
1163 if (elantech_detect(psmouse, 0))
1164 return -1;
1165
1166 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 1167 pr_err("failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 1168 return -1;
1169 }
1170
1171 return 0;
1172}
1173
3c8bbb95
JD		 1174/*
1175 * determine hardware version and set some properties according to it.
1176 */
28f49616 1177static int elantech_set_properties(struct elantech_data *etd)
3c8bbb95 1178{
1dc6edec
JD		 1179 int ver = (etd->fw_version & 0x0f0000) >> 16;
1180
3c8bbb95
JD		 1181 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1182 etd->hw_version = 1;
28f49616 1183 else if (etd->fw_version < 0x150600)
3c8bbb95 1184 etd->hw_version = 2;
1dc6edec 1185 else if (ver == 5)
28f49616 1186 etd->hw_version = 3;
1dc6edec
JD		 1187 else if (ver == 6)
1188 etd->hw_version = 4;
28f49616
JD		 1189 else
1190 return -1;
3c8bbb95
JD		 1191
1192 /*
1193 * Turn on packet checking by default.
1194 */
1195 etd->paritycheck = 1;
1196
1197 /*
1198 * This firmware suffers from misreporting coordinates when
1199 * a touch action starts causing the mouse cursor or scrolled page
1200 * to jump. Enable a workaround.
1201 */
1202 etd->jumpy_cursor =
1203 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1204
28f49616 1205 if (etd->hw_version > 1) {
3c8bbb95
JD		 1206 /* For now show extra debug information */
1207 etd->debug = 1;
1208
1209 if (etd->fw_version >= 0x020800)
1210 etd->reports_pressure = true;
1211 }
28f49616
JD		 1212
1213 return 0;
3c8bbb95
JD		 1214}
1215
2a0bd75e
AO		 1216/*
1217 * Initialize the touchpad and create sysfs entries
1218 */
1219int elantech_init(struct psmouse *psmouse)
1220{
1221 struct elantech_data *etd;
1222 int i, error;
1223 unsigned char param[3];
1224
9ab7b25e 1225 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 1226 if (!etd)
6792cbbb 1227 return -ENOMEM;
2a0bd75e
AO		 1228
1229 etd->parity[0] = 1;
1230 for (i = 1; i < 256; i++)
1231 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1232
1233 /*
9ab7b25e 1234 * Do the version query again so we can store the result
2a0bd75e
AO		 1235 */
1236 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 1237 pr_err("failed to query firmware version.\n");
2a0bd75e
AO		 1238 goto init_fail;
1239 }
504e8bee 1240 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
28f49616
JD		 1241
1242 if (elantech_set_properties(etd)) {
1243 pr_err("unknown hardware version, aborting...\n");
1244 goto init_fail;
1245 }
3c8bbb95
JD		 1246 pr_info("assuming hardware version %d "
1247 "(with firmware version 0x%02x%02x%02x)\n",
504e8bee 1248 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 1249
230282a7
JD		 1250 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1251 etd->capabilities)) {
d4ae84a8 1252 pr_err("failed to query capabilities.\n");
2a0bd75e
AO		 1253 goto init_fail;
1254 }
d4ae84a8 1255 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
230282a7
JD		 1256 etd->capabilities[0], etd->capabilities[1],
1257 etd->capabilities[2]);
2a0bd75e
AO		 1258
1259 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 1260 pr_err("failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 1261 goto init_fail;
1262 }
1263
28f49616
JD		 1264 if (elantech_set_input_params(psmouse)) {
1265 pr_err("failed to query touchpad range.\n");
1266 goto init_fail;
1267 }
2a0bd75e
AO		 1268
1269 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1270 &elantech_attr_group);
1271 if (error) {
d4ae84a8 1272 pr_err("failed to create sysfs attributes, error: %d.\n", error);
2a0bd75e
AO		 1273 goto init_fail;
1274 }
1275
1276 psmouse->protocol_handler = elantech_process_byte;
1277 psmouse->disconnect = elantech_disconnect;
1278 psmouse->reconnect = elantech_reconnect;
28f49616 1279 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
2a0bd75e
AO		 1280
1281 return 0;
1282
1283 init_fail:
1284 kfree(etd);
1285 return -1;
1286}
Linux kernel - Deliverables
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