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Input: elantech - better support all those v2 variants
[linux-2.6-block.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
84a90b61
JD		 616static int elantech_debounce_check_v2(struct psmouse *psmouse)
617{
618 /*
619 * When we encounter packet that matches this exactly, it means the
620 * hardware is in debounce status. Just ignore the whole packet.
621 */
622 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
623 unsigned char *packet = psmouse->packet;
624
625 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
626}
627
7894f21b
JD		 628static int elantech_packet_check_v2(struct psmouse *psmouse)
629{
630 struct elantech_data *etd = psmouse->private;
631 unsigned char *packet = psmouse->packet;
632
633 /*
634 * V2 hardware has two flavors. Older ones that do not report pressure,
635 * and newer ones that reports pressure and width. With newer ones, all
636 * packets (1, 2, 3 finger touch) have the same constant bits. With
637 * older ones, 1/3 finger touch packets and 2 finger touch packets
638 * have different constant bits.
639 * With all three cases, if the constant bits are not exactly what I
640 * expected, I consider them invalid.
641 */
642 if (etd->reports_pressure)
643 return (packet[0] & 0x0c) == 0x04 &&
644 (packet[3] & 0x0f) == 0x02;
645
646 if ((packet[0] & 0xc0) == 0x80)
647 return (packet[0] & 0x0c) == 0x0c &&
648 (packet[3] & 0x0e) == 0x08;
649
650 return (packet[0] & 0x3c) == 0x3c &&
651 (packet[1] & 0xf0) == 0x00 &&
652 (packet[3] & 0x3e) == 0x38 &&
653 (packet[4] & 0xf0) == 0x00;
654}
655
28f49616
JD		 656/*
657 * We check the constant bits to determine what packet type we get,
1dc6edec 658 * so packet checking is mandatory for v3 and later hardware.
28f49616
JD		 659 */
660static int elantech_packet_check_v3(struct psmouse *psmouse)
661{
662 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
663 unsigned char *packet = psmouse->packet;
664
665 /*
666 * check debounce first, it has the same signature in byte 0
667 * and byte 3 as PACKET_V3_HEAD.
668 */
669 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
670 return PACKET_DEBOUNCE;
671
672 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
673 return PACKET_V3_HEAD;
674
675 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
676 return PACKET_V3_TAIL;
677
678 return PACKET_UNKNOWN;
679}
680
1dc6edec
JD		 681static int elantech_packet_check_v4(struct psmouse *psmouse)
682{
683 unsigned char *packet = psmouse->packet;
684
685 if ((packet[0] & 0x0c) == 0x04 &&
686 (packet[3] & 0x1f) == 0x11)
687 return PACKET_V4_HEAD;
688
689 if ((packet[0] & 0x0c) == 0x04 &&
690 (packet[3] & 0x1f) == 0x12)
691 return PACKET_V4_MOTION;
692
693 if ((packet[0] & 0x0c) == 0x04 &&
694 (packet[3] & 0x1f) == 0x10)
695 return PACKET_V4_STATUS;
696
697 return PACKET_UNKNOWN;
698}
699
2a0bd75e
AO		 700/*
701 * Process byte stream from mouse and handle complete packets
702 */
703static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
704{
705 struct elantech_data *etd = psmouse->private;
28f49616 706 int packet_type;
2a0bd75e
AO		 707
708 if (psmouse->pktcnt < psmouse->pktsize)
709 return PSMOUSE_GOOD_DATA;
710
711 if (etd->debug > 1)
712 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
713
714 switch (etd->hw_version) {
715 case 1:
7894f21b 716 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
2a0bd75e
AO		 717 return PSMOUSE_BAD_DATA;
718
719 elantech_report_absolute_v1(psmouse);
720 break;
721
722 case 2:
84a90b61
JD		 723 /* ignore debounce */
724 if (elantech_debounce_check_v2(psmouse))
725 return PSMOUSE_FULL_PACKET;
726
7894f21b
JD		 727 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
728 return PSMOUSE_BAD_DATA;
729
2a0bd75e
AO		 730 elantech_report_absolute_v2(psmouse);
731 break;
28f49616
JD		 732
733 case 3:
734 packet_type = elantech_packet_check_v3(psmouse);
735 /* ignore debounce */
736 if (packet_type == PACKET_DEBOUNCE)
737 return PSMOUSE_FULL_PACKET;
738
739 if (packet_type == PACKET_UNKNOWN)
740 return PSMOUSE_BAD_DATA;
741
742 elantech_report_absolute_v3(psmouse, packet_type);
743 break;
1dc6edec
JD		 744
745 case 4:
746 packet_type = elantech_packet_check_v4(psmouse);
747 if (packet_type == PACKET_UNKNOWN)
748 return PSMOUSE_BAD_DATA;
749
750 elantech_report_absolute_v4(psmouse, packet_type);
751 break;
2a0bd75e
AO		 752 }
753
754 return PSMOUSE_FULL_PACKET;
755}
756
757/*
758 * Put the touchpad into absolute mode
759 */
760static int elantech_set_absolute_mode(struct psmouse *psmouse)
761{
762 struct elantech_data *etd = psmouse->private;
763 unsigned char val;
764 int tries = ETP_READ_BACK_TRIES;
765 int rc = 0;
766
767 switch (etd->hw_version) {
768 case 1:
769 etd->reg_10 = 0x16;
770 etd->reg_11 = 0x8f;
771 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
772 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
773 rc = -1;
774 }
775 break;
776
777 case 2:
778 /* Windows driver values */
779 etd->reg_10 = 0x54;
780 etd->reg_11 = 0x88; /* 0x8a */
781 etd->reg_21 = 0x60; /* 0x00 */
782 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
783 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
784 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
785 rc = -1;
2a0bd75e 786 }
28f49616
JD		 787 break;
788
789 case 3:
790 etd->reg_10 = 0x0b;
791 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
792 rc = -1;
793
794 break;
1dc6edec
JD		 795
796 case 4:
797 etd->reg_07 = 0x01;
798 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
799 rc = -1;
800
801 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
b2546df6
AO		 802 }
803
804 if (rc == 0) {
2a0bd75e 805 /*
b2546df6
AO		 806 * Read back reg 0x10. For hardware version 1 we must make
807 * sure the absolute mode bit is set. For hardware version 2
808 * the touchpad is probably initalising and not ready until
809 * we read back the value we just wrote.
2a0bd75e
AO		 810 */
811 do {
812 rc = elantech_read_reg(psmouse, 0x10, &val);
813 if (rc == 0)
814 break;
815 tries--;
d4ae84a8 816 elantech_debug("retrying read (%d).\n", tries);
2a0bd75e
AO		 817 msleep(ETP_READ_BACK_DELAY);
818 } while (tries > 0);
b2546df6
AO		 819
820 if (rc) {
d4ae84a8 821 pr_err("failed to read back register 0x10.\n");
b2546df6
AO		 822 } else if (etd->hw_version == 1 &&
823 !(val & ETP_R10_ABSOLUTE_MODE)) {
d4ae84a8 824 pr_err("touchpad refuses to switch to absolute mode.\n");
b2546df6
AO		 825 rc = -1;
826 }
2a0bd75e
AO		 827 }
828
1dc6edec 829 skip_readback_reg_10:
2a0bd75e 830 if (rc)
d4ae84a8 831 pr_err("failed to initialise registers.\n");
2a0bd75e
AO		 832
833 return rc;
834}
835
28f49616
JD		 836static int elantech_set_range(struct psmouse *psmouse,
837 unsigned int *x_min, unsigned int *y_min,
1dc6edec
JD		 838 unsigned int *x_max, unsigned int *y_max,
839 unsigned int *width)
230282a7
JD		 840{
841 struct elantech_data *etd = psmouse->private;
28f49616 842 unsigned char param[3];
1dc6edec 843 unsigned char traces;
230282a7
JD		 844
845 switch (etd->hw_version) {
846 case 1:
847 *x_min = ETP_XMIN_V1;
848 *y_min = ETP_YMIN_V1;
849 *x_max = ETP_XMAX_V1;
850 *y_max = ETP_YMAX_V1;
851 break;
852
853 case 2:
854 if (etd->fw_version == 0x020800 ||
855 etd->fw_version == 0x020b00 ||
856 etd->fw_version == 0x020030) {
857 *x_min = ETP_XMIN_V2;
858 *y_min = ETP_YMIN_V2;
859 *x_max = ETP_XMAX_V2;
860 *y_max = ETP_YMAX_V2;
861 } else {
84a90b61
JD		 862 int i;
863 int fixed_dpi;
864
230282a7
JD		 865 i = (etd->fw_version > 0x020800 &&
866 etd->fw_version < 0x020900) ? 1 : 2;
84a90b61
JD		 867
868 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
869 return -1;
870
871 fixed_dpi = param[1] & 0x10;
872
873 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
874 if (synaptics_send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
875 return -1;
876
877 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
878 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
879 } else if (etd->fw_version == 0x040216) {
880 *x_max = 819;
881 *y_max = 405;
882 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
883 *x_max = 900;
884 *y_max = 500;
885 } else {
886 *x_max = (etd->capabilities[1] - i) * 64;
887 *y_max = (etd->capabilities[2] - i) * 64;
888 }
230282a7
JD		 889 }
890 break;
28f49616
JD		 891
892 case 3:
893 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
894 return -1;
895
896 *x_max = (0x0f & param[0]) << 8 | param[1];
897 *y_max = (0xf0 & param[0]) << 4 | param[2];
898 break;
1dc6edec
JD		 899
900 case 4:
901 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
902 return -1;
903
904 *x_max = (0x0f & param[0]) << 8 | param[1];
905 *y_max = (0xf0 & param[0]) << 4 | param[2];
906 traces = etd->capabilities[1];
907 if ((traces < 2) || (traces > *x_max))
908 return -1;
909
910 *width = *x_max / (traces - 1);
911 break;
230282a7 912 }
28f49616
JD		 913
914 return 0;
230282a7
JD		 915}
916
2a0bd75e
AO		 917/*
918 * Set the appropriate event bits for the input subsystem
919 */
28f49616 920static int elantech_set_input_params(struct psmouse *psmouse)
2a0bd75e
AO		 921{
922 struct input_dev *dev = psmouse->dev;
923 struct elantech_data *etd = psmouse->private;
1dc6edec 924 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
230282a7 925
1dc6edec 926 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
28f49616 927 return -1;
2a0bd75e
AO		 928
929 __set_bit(EV_KEY, dev->evbit);
930 __set_bit(EV_ABS, dev->evbit);
c7a1f3cc 931 __clear_bit(EV_REL, dev->evbit);
2a0bd75e
AO		 932
933 __set_bit(BTN_LEFT, dev->keybit);
934 __set_bit(BTN_RIGHT, dev->keybit);
935
936 __set_bit(BTN_TOUCH, dev->keybit);
937 __set_bit(BTN_TOOL_FINGER, dev->keybit);
938 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
939 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
940
941 switch (etd->hw_version) {
942 case 1:
943 /* Rocker button */
504e8bee 944 if (etd->fw_version < 0x020000 &&
230282a7 945 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
2a0bd75e
AO		 946 __set_bit(BTN_FORWARD, dev->keybit);
947 __set_bit(BTN_BACK, dev->keybit);
948 }
230282a7
JD		 949 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
950 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
2a0bd75e
AO		 951 break;
952
953 case 2:
22462d9f 954 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
28f49616
JD		 955 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
956 /* fall through */
957 case 3:
230282a7
JD		 958 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
959 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
f941c705
ÉP		 960 if (etd->reports_pressure) {
961 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
962 ETP_PMAX_V2, 0, 0);
963 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
964 ETP_WMAX_V2, 0, 0);
965 }
89eec4d7 966 input_mt_init_slots(dev, 2);
230282a7
JD		 967 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
968 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
2a0bd75e 969 break;
1dc6edec
JD		 970
971 case 4:
972 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
973 /* For X to recognize me as touchpad. */
974 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
975 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
976 /*
977 * range of pressure and width is the same as v2,
978 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
979 */
980 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
981 ETP_PMAX_V2, 0, 0);
982 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
983 ETP_WMAX_V2, 0, 0);
984 /* Multitouch capable pad, up to 5 fingers. */
985 input_mt_init_slots(dev, ETP_MAX_FINGERS);
986 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
987 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
988 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
989 ETP_PMAX_V2, 0, 0);
990 /*
991 * The firmware reports how many trace lines the finger spans,
992 * convert to surface unit as Protocol-B requires.
993 */
994 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
995 ETP_WMAX_V2 * width, 0, 0);
996 break;
2a0bd75e 997 }
230282a7
JD		 998
999 etd->y_max = y_max;
1dc6edec 1000 etd->width = width;
28f49616
JD		 1001
1002 return 0;
2a0bd75e
AO		 1003}
1004
1005struct elantech_attr_data {
1006 size_t field_offset;
1007 unsigned char reg;
1008};
1009
1010/*
1011 * Display a register value by reading a sysfs entry
1012 */
1013static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1014 char *buf)
1015{
1016 struct elantech_data *etd = psmouse->private;
1017 struct elantech_attr_data *attr = data;
1018 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1019 int rc = 0;
1020
1021 if (attr->reg)
1022 rc = elantech_read_reg(psmouse, attr->reg, reg);
1023
1024 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1025}
1026
1027/*
1028 * Write a register value by writing a sysfs entry
1029 */
1030static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1031 void *data, const char *buf, size_t count)
1032{
1033 struct elantech_data *etd = psmouse->private;
1034 struct elantech_attr_data *attr = data;
1035 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1036 unsigned long value;
1037 int err;
1038
1039 err = strict_strtoul(buf, 16, &value);
1040 if (err)
1041 return err;
1042
1043 if (value > 0xff)
1044 return -EINVAL;
1045
1046 /* Do we need to preserve some bits for version 2 hardware too? */
1047 if (etd->hw_version == 1) {
1048 if (attr->reg == 0x10)
1049 /* Force absolute mode always on */
1050 value |= ETP_R10_ABSOLUTE_MODE;
1051 else if (attr->reg == 0x11)
1052 /* Force 4 byte mode always on */
1053 value |= ETP_R11_4_BYTE_MODE;
1054 }
1055
1056 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1057 *reg = value;
1058
1059 return count;
1060}
1061
1062#define ELANTECH_INT_ATTR(_name, _register) \
1063 static struct elantech_attr_data elantech_attr_##_name = { \
1064 .field_offset = offsetof(struct elantech_data, _name), \
1065 .reg = _register, \
1066 }; \
1067 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1068 &elantech_attr_##_name, \
1069 elantech_show_int_attr, \
1070 elantech_set_int_attr)
1071
1dc6edec 1072ELANTECH_INT_ATTR(reg_07, 0x07);
2a0bd75e
AO		 1073ELANTECH_INT_ATTR(reg_10, 0x10);
1074ELANTECH_INT_ATTR(reg_11, 0x11);
1075ELANTECH_INT_ATTR(reg_20, 0x20);
1076ELANTECH_INT_ATTR(reg_21, 0x21);
1077ELANTECH_INT_ATTR(reg_22, 0x22);
1078ELANTECH_INT_ATTR(reg_23, 0x23);
1079ELANTECH_INT_ATTR(reg_24, 0x24);
1080ELANTECH_INT_ATTR(reg_25, 0x25);
1081ELANTECH_INT_ATTR(reg_26, 0x26);
1082ELANTECH_INT_ATTR(debug, 0);
1083ELANTECH_INT_ATTR(paritycheck, 0);
1084
1085static struct attribute *elantech_attrs[] = {
1dc6edec 1086 &psmouse_attr_reg_07.dattr.attr,
2a0bd75e
AO		 1087 &psmouse_attr_reg_10.dattr.attr,
1088 &psmouse_attr_reg_11.dattr.attr,
1089 &psmouse_attr_reg_20.dattr.attr,
1090 &psmouse_attr_reg_21.dattr.attr,
1091 &psmouse_attr_reg_22.dattr.attr,
1092 &psmouse_attr_reg_23.dattr.attr,
1093 &psmouse_attr_reg_24.dattr.attr,
1094 &psmouse_attr_reg_25.dattr.attr,
1095 &psmouse_attr_reg_26.dattr.attr,
1096 &psmouse_attr_debug.dattr.attr,
1097 &psmouse_attr_paritycheck.dattr.attr,
1098 NULL
1099};
1100
1101static struct attribute_group elantech_attr_group = {
1102 .attrs = elantech_attrs,
1103};
1104
a083632e
DT		 1105static bool elantech_is_signature_valid(const unsigned char *param)
1106{
1107 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1108 int i;
1109
1110 if (param[0] == 0)
1111 return false;
1112
1113 if (param[1] == 0)
1114 return true;
1115
1116 for (i = 0; i < ARRAY_SIZE(rates); i++)
1117 if (param[2] == rates[i])
1118 return false;
1119
1120 return true;
1121}
1122
2a0bd75e
AO		 1123/*
1124 * Use magic knock to detect Elantech touchpad
1125 */
b7802c5c 1126int elantech_detect(struct psmouse *psmouse, bool set_properties)
2a0bd75e
AO		 1127{
1128 struct ps2dev *ps2dev = &psmouse->ps2dev;
1129 unsigned char param[3];
1130
1131 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1132
1133 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1134 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1135 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1136 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1137 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
d4ae84a8 1138 pr_debug("sending Elantech magic knock failed.\n");
2a0bd75e
AO		 1139 return -1;
1140 }
1141
1142 /*
1143 * Report this in case there are Elantech models that use a different
1144 * set of magic numbers
1145 */
28f49616
JD		 1146 if (param[0] != 0x3c || param[1] != 0x03 ||
1147 (param[2] != 0xc8 && param[2] != 0x00)) {
d4ae84a8 1148 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 1149 param[0], param[1], param[2]);
1150 return -1;
1151 }
1152
1153 /*
1154 * Query touchpad's firmware version and see if it reports known
1155 * value to avoid mis-detection. Logitech mice are known to respond
1156 * to Elantech magic knock and there might be more.
1157 */
1158 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 1159 pr_debug("failed to query firmware version.\n");
9ab7b25e
AO		 1160 return -1;
1161 }
1162
d4ae84a8 1163 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
9ab7b25e
AO		 1164 param[0], param[1], param[2]);
1165
a083632e 1166 if (!elantech_is_signature_valid(param)) {
f81bc788 1167 if (!force_elantech) {
d4ae84a8 1168 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
f81bc788
FR		 1169 return -1;
1170 }
1171
d4ae84a8 1172 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
2a0bd75e
AO		 1173 }
1174
1175 if (set_properties) {
1176 psmouse->vendor = "Elantech";
1177 psmouse->name = "Touchpad";
1178 }
1179
1180 return 0;
1181}
1182
1183/*
1184 * Clean up sysfs entries when disconnecting
1185 */
1186static void elantech_disconnect(struct psmouse *psmouse)
1187{
1188 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1189 &elantech_attr_group);
1190 kfree(psmouse->private);
1191 psmouse->private = NULL;
1192}
1193
1194/*
1195 * Put the touchpad back into absolute mode when reconnecting
1196 */
1197static int elantech_reconnect(struct psmouse *psmouse)
1198{
1199 if (elantech_detect(psmouse, 0))
1200 return -1;
1201
1202 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 1203 pr_err("failed to put touchpad back into absolute mode.\n");
2a0bd75e
AO		 1204 return -1;
1205 }
1206
1207 return 0;
1208}
1209
3c8bbb95
JD		 1210/*
1211 * determine hardware version and set some properties according to it.
1212 */
28f49616 1213static int elantech_set_properties(struct elantech_data *etd)
3c8bbb95 1214{
1dc6edec
JD		 1215 int ver = (etd->fw_version & 0x0f0000) >> 16;
1216
3c8bbb95
JD		 1217 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1218 etd->hw_version = 1;
28f49616 1219 else if (etd->fw_version < 0x150600)
3c8bbb95 1220 etd->hw_version = 2;
1dc6edec 1221 else if (ver == 5)
28f49616 1222 etd->hw_version = 3;
1dc6edec
JD		 1223 else if (ver == 6)
1224 etd->hw_version = 4;
28f49616
JD		 1225 else
1226 return -1;
3c8bbb95
JD		 1227
1228 /*
1229 * Turn on packet checking by default.
1230 */
1231 etd->paritycheck = 1;
1232
1233 /*
1234 * This firmware suffers from misreporting coordinates when
1235 * a touch action starts causing the mouse cursor or scrolled page
1236 * to jump. Enable a workaround.
1237 */
1238 etd->jumpy_cursor =
1239 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1240
28f49616 1241 if (etd->hw_version > 1) {
3c8bbb95
JD		 1242 /* For now show extra debug information */
1243 etd->debug = 1;
1244
1245 if (etd->fw_version >= 0x020800)
1246 etd->reports_pressure = true;
1247 }
28f49616
JD		 1248
1249 return 0;
3c8bbb95
JD		 1250}
1251
2a0bd75e
AO		 1252/*
1253 * Initialize the touchpad and create sysfs entries
1254 */
1255int elantech_init(struct psmouse *psmouse)
1256{
1257 struct elantech_data *etd;
1258 int i, error;
1259 unsigned char param[3];
1260
9ab7b25e 1261 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
2a0bd75e 1262 if (!etd)
6792cbbb 1263 return -ENOMEM;
2a0bd75e
AO		 1264
1265 etd->parity[0] = 1;
1266 for (i = 1; i < 256; i++)
1267 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1268
1269 /*
9ab7b25e 1270 * Do the version query again so we can store the result
2a0bd75e
AO		 1271 */
1272 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
d4ae84a8 1273 pr_err("failed to query firmware version.\n");
2a0bd75e
AO		 1274 goto init_fail;
1275 }
504e8bee 1276 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
28f49616
JD		 1277
1278 if (elantech_set_properties(etd)) {
1279 pr_err("unknown hardware version, aborting...\n");
1280 goto init_fail;
1281 }
3c8bbb95
JD		 1282 pr_info("assuming hardware version %d "
1283 "(with firmware version 0x%02x%02x%02x)\n",
504e8bee 1284 etd->hw_version, param[0], param[1], param[2]);
2a0bd75e 1285
230282a7
JD		 1286 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1287 etd->capabilities)) {
d4ae84a8 1288 pr_err("failed to query capabilities.\n");
2a0bd75e
AO		 1289 goto init_fail;
1290 }
d4ae84a8 1291 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
230282a7
JD		 1292 etd->capabilities[0], etd->capabilities[1],
1293 etd->capabilities[2]);
2a0bd75e
AO		 1294
1295 if (elantech_set_absolute_mode(psmouse)) {
d4ae84a8 1296 pr_err("failed to put touchpad into absolute mode.\n");
2a0bd75e
AO		 1297 goto init_fail;
1298 }
1299
28f49616
JD		 1300 if (elantech_set_input_params(psmouse)) {
1301 pr_err("failed to query touchpad range.\n");
1302 goto init_fail;
1303 }
2a0bd75e
AO		 1304
1305 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1306 &elantech_attr_group);
1307 if (error) {
d4ae84a8 1308 pr_err("failed to create sysfs attributes, error: %d.\n", error);
2a0bd75e
AO		 1309 goto init_fail;
1310 }
1311
1312 psmouse->protocol_handler = elantech_process_byte;
1313 psmouse->disconnect = elantech_disconnect;
1314 psmouse->reconnect = elantech_reconnect;
28f49616 1315 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
2a0bd75e
AO		 1316
1317 return 0;
1318
1319 init_fail:
1320 kfree(etd);
1321 return -1;
1322}
Linux 6.x block layer and io_uring tree(s)