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[pohmelfs.git] / drivers / input / mouse / elantech.c
blobd2c0db159b18dfc364c2ff7fc036863ef2de9614
1 /*
2 * Elantech Touchpad driver (v6)
3 *
4 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 *
10 * Trademarks are the property of their respective owners.
11 */
12
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/input.h>
17 #include <linux/input/mt.h>
18 #include <linux/serio.h>
19 #include <linux/libps2.h>
20 #include "psmouse.h"
21 #include "elantech.h"
22
23 #define elantech_debug(fmt, ...) \
24 do { \
25 if (etd->debug) \
26 psmouse_printk(KERN_DEBUG, psmouse, \
27 fmt, ##__VA_ARGS__); \
28 } while (0)
29
30 /*
31 * Send a Synaptics style sliced query command
32 */
33 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
34 unsigned char *param)
35 {
36 if (psmouse_sliced_command(psmouse, c) ||
37 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
38 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
39 return -1;
40 }
41
42 return 0;
43 }
44
45 /*
46 * V3 and later support this fast command
47 */
48 static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
49 unsigned char *param)
50 {
51 struct ps2dev *ps2dev = &psmouse->ps2dev;
52
53 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
54 ps2_command(ps2dev, NULL, c) ||
55 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
56 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
57 return -1;
58 }
59
60 return 0;
61 }
62
63 /*
64 * A retrying version of ps2_command
65 */
66 static int elantech_ps2_command(struct psmouse *psmouse,
67 unsigned char *param, int command)
68 {
69 struct ps2dev *ps2dev = &psmouse->ps2dev;
70 struct elantech_data *etd = psmouse->private;
71 int rc;
72 int tries = ETP_PS2_COMMAND_TRIES;
73
74 do {
75 rc = ps2_command(ps2dev, param, command);
76 if (rc == 0)
77 break;
78 tries--;
79 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
80 command, tries);
81 msleep(ETP_PS2_COMMAND_DELAY);
82 } while (tries > 0);
83
84 if (rc)
85 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
86
87 return rc;
88 }
89
90 /*
91 * Send an Elantech style special command to read a value from a register
92 */
93 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
94 unsigned char *val)
95 {
96 struct elantech_data *etd = psmouse->private;
97 unsigned char param[3];
98 int rc = 0;
99
100 if (reg < 0x07 || reg > 0x26)
101 return -1;
102
103 if (reg > 0x11 && reg < 0x20)
104 return -1;
105
106 switch (etd->hw_version) {
107 case 1:
108 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
109 psmouse_sliced_command(psmouse, reg) ||
110 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
111 rc = -1;
112 }
113 break;
114
115 case 2:
116 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
117 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
118 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
119 elantech_ps2_command(psmouse, NULL, reg) ||
120 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
121 rc = -1;
122 }
123 break;
124
125 case 3 ... 4:
126 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
127 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
128 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
129 elantech_ps2_command(psmouse, NULL, reg) ||
130 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
131 rc = -1;
132 }
133 break;
134 }
135
136 if (rc)
137 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
138 else if (etd->hw_version != 4)
139 *val = param[0];
140 else
141 *val = param[1];
142
143 return rc;
144 }
145
146 /*
147 * Send an Elantech style special command to write a register with a value
148 */
149 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
150 unsigned char val)
151 {
152 struct elantech_data *etd = psmouse->private;
153 int rc = 0;
154
155 if (reg < 0x07 || reg > 0x26)
156 return -1;
157
158 if (reg > 0x11 && reg < 0x20)
159 return -1;
160
161 switch (etd->hw_version) {
162 case 1:
163 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
164 psmouse_sliced_command(psmouse, reg) ||
165 psmouse_sliced_command(psmouse, val) ||
166 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
167 rc = -1;
168 }
169 break;
170
171 case 2:
172 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
173 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
174 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
175 elantech_ps2_command(psmouse, NULL, reg) ||
176 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
177 elantech_ps2_command(psmouse, NULL, val) ||
178 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
179 rc = -1;
180 }
181 break;
182
183 case 3:
184 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
185 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
186 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
187 elantech_ps2_command(psmouse, NULL, reg) ||
188 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
189 elantech_ps2_command(psmouse, NULL, val) ||
190 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
191 rc = -1;
192 }
193 break;
194
195 case 4:
196 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
197 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
198 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
199 elantech_ps2_command(psmouse, NULL, reg) ||
200 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
201 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
202 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
203 elantech_ps2_command(psmouse, NULL, val) ||
204 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
205 rc = -1;
206 }
207 break;
208 }
209
210 if (rc)
211 psmouse_err(psmouse,
212 "failed to write register 0x%02x with value 0x%02x.\n",
213 reg, val);
214
215 return rc;
216 }
217
218 /*
219 * Dump a complete mouse movement packet to the syslog
220 */
221 static void elantech_packet_dump(struct psmouse *psmouse)
222 {
223 int i;
224
225 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
226 for (i = 0; i < psmouse->pktsize; i++)
227 printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
228 printk("]\n");
229 }
230
231 /*
232 * Interpret complete data packets and report absolute mode input events for
233 * hardware version 1. (4 byte packets)
234 */
235 static void elantech_report_absolute_v1(struct psmouse *psmouse)
236 {
237 struct input_dev *dev = psmouse->dev;
238 struct elantech_data *etd = psmouse->private;
239 unsigned char *packet = psmouse->packet;
240 int fingers;
241
242 if (etd->fw_version < 0x020000) {
243 /*
244 * byte 0: D U p1 p2 1 p3 R L
245 * byte 1: f 0 th tw x9 x8 y9 y8
246 */
247 fingers = ((packet[1] & 0x80) >> 7) +
248 ((packet[1] & 0x30) >> 4);
249 } else {
250 /*
251 * byte 0: n1 n0 p2 p1 1 p3 R L
252 * byte 1: 0 0 0 0 x9 x8 y9 y8
253 */
254 fingers = (packet[0] & 0xc0) >> 6;
255 }
256
257 if (etd->jumpy_cursor) {
258 if (fingers != 1) {
259 etd->single_finger_reports = 0;
260 } else if (etd->single_finger_reports < 2) {
261 /* Discard first 2 reports of one finger, bogus */
262 etd->single_finger_reports++;
263 elantech_debug("discarding packet\n");
264 return;
265 }
266 }
267
268 input_report_key(dev, BTN_TOUCH, fingers != 0);
269
270 /*
271 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
272 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
273 */
274 if (fingers) {
275 input_report_abs(dev, ABS_X,
276 ((packet[1] & 0x0c) << 6) | packet[2]);
277 input_report_abs(dev, ABS_Y,
278 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
279 }
280
281 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
282 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
283 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
284 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
285 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
286
287 if (etd->fw_version < 0x020000 &&
288 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
289 /* rocker up */
290 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
291 /* rocker down */
292 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
293 }
294
295 input_sync(dev);
296 }
297
298 static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
299 unsigned int x, unsigned int y)
300 {
301 input_mt_slot(dev, slot);
302 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
303 if (active) {
304 input_report_abs(dev, ABS_MT_POSITION_X, x);
305 input_report_abs(dev, ABS_MT_POSITION_Y, y);
306 }
307 }
308
309 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
310 static void elantech_report_semi_mt_data(struct input_dev *dev,
311 unsigned int num_fingers,
312 unsigned int x1, unsigned int y1,
313 unsigned int x2, unsigned int y2)
314 {
315 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
316 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
317 }
318
319 /*
320 * Interpret complete data packets and report absolute mode input events for
321 * hardware version 2. (6 byte packets)
322 */
323 static void elantech_report_absolute_v2(struct psmouse *psmouse)
324 {
325 struct elantech_data *etd = psmouse->private;
326 struct input_dev *dev = psmouse->dev;
327 unsigned char *packet = psmouse->packet;
328 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
329 unsigned int width = 0, pres = 0;
330
331 /* byte 0: n1 n0 . . . . R L */
332 fingers = (packet[0] & 0xc0) >> 6;
333
334 switch (fingers) {
335 case 3:
336 /*
337 * Same as one finger, except report of more than 3 fingers:
338 * byte 3: n4 . w1 w0 . . . .
339 */
340 if (packet[3] & 0x80)
341 fingers = 4;
342 /* pass through... */
343 case 1:
344 /*
345 * byte 1: . . . . x11 x10 x9 x8
346 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
347 */
348 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
349 /*
350 * byte 4: . . . . y11 y10 y9 y8
351 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
352 */
353 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
354
355 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
356 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
357 break;
358
359 case 2:
360 /*
361 * The coordinate of each finger is reported separately
362 * with a lower resolution for two finger touches:
363 * byte 0: . . ay8 ax8 . . . .
364 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
365 */
366 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
367 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
368 y1 = etd->y_max -
369 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
370 /*
371 * byte 3: . . by8 bx8 . . . .
372 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
373 */
374 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
375 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
376 y2 = etd->y_max -
377 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
378
379 /* Unknown so just report sensible values */
380 pres = 127;
381 width = 7;
382 break;
383 }
384
385 input_report_key(dev, BTN_TOUCH, fingers != 0);
386 if (fingers != 0) {
387 input_report_abs(dev, ABS_X, x1);
388 input_report_abs(dev, ABS_Y, y1);
389 }
390 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
391 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
392 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
393 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
394 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
395 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
396 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
397 if (etd->reports_pressure) {
398 input_report_abs(dev, ABS_PRESSURE, pres);
399 input_report_abs(dev, ABS_TOOL_WIDTH, width);
400 }
401
402 input_sync(dev);
403 }
404
405 /*
406 * Interpret complete data packets and report absolute mode input events for
407 * hardware version 3. (12 byte packets for two fingers)
408 */
409 static void elantech_report_absolute_v3(struct psmouse *psmouse,
410 int packet_type)
411 {
412 struct input_dev *dev = psmouse->dev;
413 struct elantech_data *etd = psmouse->private;
414 unsigned char *packet = psmouse->packet;
415 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
416 unsigned int width = 0, pres = 0;
417
418 /* byte 0: n1 n0 . . . . R L */
419 fingers = (packet[0] & 0xc0) >> 6;
420
421 switch (fingers) {
422 case 3:
423 case 1:
424 /*
425 * byte 1: . . . . x11 x10 x9 x8
426 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
427 */
428 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
429 /*
430 * byte 4: . . . . y11 y10 y9 y8
431 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
432 */
433 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
434 break;
435
436 case 2:
437 if (packet_type == PACKET_V3_HEAD) {
438 /*
439 * byte 1: . . . . ax11 ax10 ax9 ax8
440 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
441 */
442 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
443 /*
444 * byte 4: . . . . ay11 ay10 ay9 ay8
445 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
446 */
447 etd->mt[0].y = etd->y_max -
448 (((packet[4] & 0x0f) << 8) | packet[5]);
449 /*
450 * wait for next packet
451 */
452 return;
453 }
454
455 /* packet_type == PACKET_V3_TAIL */
456 x1 = etd->mt[0].x;
457 y1 = etd->mt[0].y;
458 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
459 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
460 break;
461 }
462
463 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
464 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
465
466 input_report_key(dev, BTN_TOUCH, fingers != 0);
467 if (fingers != 0) {
468 input_report_abs(dev, ABS_X, x1);
469 input_report_abs(dev, ABS_Y, y1);
470 }
471 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
472 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
473 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
474 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
475 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
476 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
477 input_report_abs(dev, ABS_PRESSURE, pres);
478 input_report_abs(dev, ABS_TOOL_WIDTH, width);
479
480 input_sync(dev);
481 }
482
483 static void elantech_input_sync_v4(struct psmouse *psmouse)
484 {
485 struct input_dev *dev = psmouse->dev;
486 unsigned char *packet = psmouse->packet;
487
488 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
489 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
490 input_mt_report_pointer_emulation(dev, true);
491 input_sync(dev);
492 }
493
494 static void process_packet_status_v4(struct psmouse *psmouse)
495 {
496 struct input_dev *dev = psmouse->dev;
497 unsigned char *packet = psmouse->packet;
498 unsigned fingers;
499 int i;
500
501 /* notify finger state change */
502 fingers = packet[1] & 0x1f;
503 for (i = 0; i < ETP_MAX_FINGERS; i++) {
504 if ((fingers & (1 << i)) == 0) {
505 input_mt_slot(dev, i);
506 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
507 }
508 }
509
510 elantech_input_sync_v4(psmouse);
511 }
512
513 static void process_packet_head_v4(struct psmouse *psmouse)
514 {
515 struct input_dev *dev = psmouse->dev;
516 struct elantech_data *etd = psmouse->private;
517 unsigned char *packet = psmouse->packet;
518 int id = ((packet[3] & 0xe0) >> 5) - 1;
519 int pres, traces;
520
521 if (id < 0)
522 return;
523
524 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
525 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
526 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
527 traces = (packet[0] & 0xf0) >> 4;
528
529 input_mt_slot(dev, id);
530 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
531
532 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
533 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
534 input_report_abs(dev, ABS_MT_PRESSURE, pres);
535 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
536 /* report this for backwards compatibility */
537 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
538
539 elantech_input_sync_v4(psmouse);
540 }
541
542 static void process_packet_motion_v4(struct psmouse *psmouse)
543 {
544 struct input_dev *dev = psmouse->dev;
545 struct elantech_data *etd = psmouse->private;
546 unsigned char *packet = psmouse->packet;
547 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
548 int id, sid;
549
550 id = ((packet[0] & 0xe0) >> 5) - 1;
551 if (id < 0)
552 return;
553
554 sid = ((packet[3] & 0xe0) >> 5) - 1;
555 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
556 /*
557 * Motion packets give us the delta of x, y values of specific fingers,
558 * but in two's complement. Let the compiler do the conversion for us.
559 * Also _enlarge_ the numbers to int, in case of overflow.
560 */
561 delta_x1 = (signed char)packet[1];
562 delta_y1 = (signed char)packet[2];
563 delta_x2 = (signed char)packet[4];
564 delta_y2 = (signed char)packet[5];
565
566 etd->mt[id].x += delta_x1 * weight;
567 etd->mt[id].y -= delta_y1 * weight;
568 input_mt_slot(dev, id);
569 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
570 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
571
572 if (sid >= 0) {
573 etd->mt[sid].x += delta_x2 * weight;
574 etd->mt[sid].y -= delta_y2 * weight;
575 input_mt_slot(dev, sid);
576 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
577 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
578 }
579
580 elantech_input_sync_v4(psmouse);
581 }
582
583 static void elantech_report_absolute_v4(struct psmouse *psmouse,
584 int packet_type)
585 {
586 switch (packet_type) {
587 case PACKET_V4_STATUS:
588 process_packet_status_v4(psmouse);
589 break;
590
591 case PACKET_V4_HEAD:
592 process_packet_head_v4(psmouse);
593 break;
594
595 case PACKET_V4_MOTION:
596 process_packet_motion_v4(psmouse);
597 break;
598
599 case PACKET_UNKNOWN:
600 default:
601 /* impossible to get here */
602 break;
603 }
604 }
605
606 static int elantech_packet_check_v1(struct psmouse *psmouse)
607 {
608 struct elantech_data *etd = psmouse->private;
609 unsigned char *packet = psmouse->packet;
610 unsigned char p1, p2, p3;
611
612 /* Parity bits are placed differently */
613 if (etd->fw_version < 0x020000) {
614 /* byte 0: D U p1 p2 1 p3 R L */
615 p1 = (packet[0] & 0x20) >> 5;
616 p2 = (packet[0] & 0x10) >> 4;
617 } else {
618 /* byte 0: n1 n0 p2 p1 1 p3 R L */
619 p1 = (packet[0] & 0x10) >> 4;
620 p2 = (packet[0] & 0x20) >> 5;
621 }
622
623 p3 = (packet[0] & 0x04) >> 2;
624
625 return etd->parity[packet[1]] == p1 &&
626 etd->parity[packet[2]] == p2 &&
627 etd->parity[packet[3]] == p3;
628 }
629
630 static int elantech_debounce_check_v2(struct psmouse *psmouse)
631 {
632 /*
633 * When we encounter packet that matches this exactly, it means the
634 * hardware is in debounce status. Just ignore the whole packet.
635 */
636 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
637 unsigned char *packet = psmouse->packet;
638
639 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
640 }
641
642 static int elantech_packet_check_v2(struct psmouse *psmouse)
643 {
644 struct elantech_data *etd = psmouse->private;
645 unsigned char *packet = psmouse->packet;
646
647 /*
648 * V2 hardware has two flavors. Older ones that do not report pressure,
649 * and newer ones that reports pressure and width. With newer ones, all
650 * packets (1, 2, 3 finger touch) have the same constant bits. With
651 * older ones, 1/3 finger touch packets and 2 finger touch packets
652 * have different constant bits.
653 * With all three cases, if the constant bits are not exactly what I
654 * expected, I consider them invalid.
655 */
656 if (etd->reports_pressure)
657 return (packet[0] & 0x0c) == 0x04 &&
658 (packet[3] & 0x0f) == 0x02;
659
660 if ((packet[0] & 0xc0) == 0x80)
661 return (packet[0] & 0x0c) == 0x0c &&
662 (packet[3] & 0x0e) == 0x08;
663
664 return (packet[0] & 0x3c) == 0x3c &&
665 (packet[1] & 0xf0) == 0x00 &&
666 (packet[3] & 0x3e) == 0x38 &&
667 (packet[4] & 0xf0) == 0x00;
668 }
669
670 /*
671 * We check the constant bits to determine what packet type we get,
672 * so packet checking is mandatory for v3 and later hardware.
673 */
674 static int elantech_packet_check_v3(struct psmouse *psmouse)
675 {
676 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
677 unsigned char *packet = psmouse->packet;
678
679 /*
680 * check debounce first, it has the same signature in byte 0
681 * and byte 3 as PACKET_V3_HEAD.
682 */
683 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
684 return PACKET_DEBOUNCE;
685
686 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
687 return PACKET_V3_HEAD;
688
689 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
690 return PACKET_V3_TAIL;
691
692 return PACKET_UNKNOWN;
693 }
694
695 static int elantech_packet_check_v4(struct psmouse *psmouse)
696 {
697 unsigned char *packet = psmouse->packet;
698
699 if ((packet[0] & 0x0c) == 0x04 &&
700 (packet[3] & 0x1f) == 0x11)
701 return PACKET_V4_HEAD;
702
703 if ((packet[0] & 0x0c) == 0x04 &&
704 (packet[3] & 0x1f) == 0x12)
705 return PACKET_V4_MOTION;
706
707 if ((packet[0] & 0x0c) == 0x04 &&
708 (packet[3] & 0x1f) == 0x10)
709 return PACKET_V4_STATUS;
710
711 return PACKET_UNKNOWN;
712 }
713
714 /*
715 * Process byte stream from mouse and handle complete packets
716 */
717 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
718 {
719 struct elantech_data *etd = psmouse->private;
720 int packet_type;
721
722 if (psmouse->pktcnt < psmouse->pktsize)
723 return PSMOUSE_GOOD_DATA;
724
725 if (etd->debug > 1)
726 elantech_packet_dump(psmouse);
727
728 switch (etd->hw_version) {
729 case 1:
730 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
731 return PSMOUSE_BAD_DATA;
732
733 elantech_report_absolute_v1(psmouse);
734 break;
735
736 case 2:
737 /* ignore debounce */
738 if (elantech_debounce_check_v2(psmouse))
739 return PSMOUSE_FULL_PACKET;
740
741 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
742 return PSMOUSE_BAD_DATA;
743
744 elantech_report_absolute_v2(psmouse);
745 break;
746
747 case 3:
748 packet_type = elantech_packet_check_v3(psmouse);
749 /* ignore debounce */
750 if (packet_type == PACKET_DEBOUNCE)
751 return PSMOUSE_FULL_PACKET;
752
753 if (packet_type == PACKET_UNKNOWN)
754 return PSMOUSE_BAD_DATA;
755
756 elantech_report_absolute_v3(psmouse, packet_type);
757 break;
758
759 case 4:
760 packet_type = elantech_packet_check_v4(psmouse);
761 if (packet_type == PACKET_UNKNOWN)
762 return PSMOUSE_BAD_DATA;
763
764 elantech_report_absolute_v4(psmouse, packet_type);
765 break;
766 }
767
768 return PSMOUSE_FULL_PACKET;
769 }
770
771 /*
772 * Put the touchpad into absolute mode
773 */
774 static int elantech_set_absolute_mode(struct psmouse *psmouse)
775 {
776 struct elantech_data *etd = psmouse->private;
777 unsigned char val;
778 int tries = ETP_READ_BACK_TRIES;
779 int rc = 0;
780
781 switch (etd->hw_version) {
782 case 1:
783 etd->reg_10 = 0x16;
784 etd->reg_11 = 0x8f;
785 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
786 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
787 rc = -1;
788 }
789 break;
790
791 case 2:
792 /* Windows driver values */
793 etd->reg_10 = 0x54;
794 etd->reg_11 = 0x88; /* 0x8a */
795 etd->reg_21 = 0x60; /* 0x00 */
796 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
797 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
798 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
799 rc = -1;
800 }
801 break;
802
803 case 3:
804 etd->reg_10 = 0x0b;
805 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
806 rc = -1;
807
808 break;
809
810 case 4:
811 etd->reg_07 = 0x01;
812 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
813 rc = -1;
814
815 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
816 }
817
818 if (rc == 0) {
819 /*
820 * Read back reg 0x10. For hardware version 1 we must make
821 * sure the absolute mode bit is set. For hardware version 2
822 * the touchpad is probably initializing and not ready until
823 * we read back the value we just wrote.
824 */
825 do {
826 rc = elantech_read_reg(psmouse, 0x10, &val);
827 if (rc == 0)
828 break;
829 tries--;
830 elantech_debug("retrying read (%d).\n", tries);
831 msleep(ETP_READ_BACK_DELAY);
832 } while (tries > 0);
833
834 if (rc) {
835 psmouse_err(psmouse,
836 "failed to read back register 0x10.\n");
837 } else if (etd->hw_version == 1 &&
838 !(val & ETP_R10_ABSOLUTE_MODE)) {
839 psmouse_err(psmouse,
840 "touchpad refuses to switch to absolute mode.\n");
841 rc = -1;
842 }
843 }
844
845 skip_readback_reg_10:
846 if (rc)
847 psmouse_err(psmouse, "failed to initialise registers.\n");
848
849 return rc;
850 }
851
852 static int elantech_set_range(struct psmouse *psmouse,
853 unsigned int *x_min, unsigned int *y_min,
854 unsigned int *x_max, unsigned int *y_max,
855 unsigned int *width)
856 {
857 struct elantech_data *etd = psmouse->private;
858 unsigned char param[3];
859 unsigned char traces;
860
861 switch (etd->hw_version) {
862 case 1:
863 *x_min = ETP_XMIN_V1;
864 *y_min = ETP_YMIN_V1;
865 *x_max = ETP_XMAX_V1;
866 *y_max = ETP_YMAX_V1;
867 break;
868
869 case 2:
870 if (etd->fw_version == 0x020800 ||
871 etd->fw_version == 0x020b00 ||
872 etd->fw_version == 0x020030) {
873 *x_min = ETP_XMIN_V2;
874 *y_min = ETP_YMIN_V2;
875 *x_max = ETP_XMAX_V2;
876 *y_max = ETP_YMAX_V2;
877 } else {
878 int i;
879 int fixed_dpi;
880
881 i = (etd->fw_version > 0x020800 &&
882 etd->fw_version < 0x020900) ? 1 : 2;
883
884 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
885 return -1;
886
887 fixed_dpi = param[1] & 0x10;
888
889 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
890 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
891 return -1;
892
893 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
894 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
895 } else if (etd->fw_version == 0x040216) {
896 *x_max = 819;
897 *y_max = 405;
898 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
899 *x_max = 900;
900 *y_max = 500;
901 } else {
902 *x_max = (etd->capabilities[1] - i) * 64;
903 *y_max = (etd->capabilities[2] - i) * 64;
904 }
905 }
906 break;
907
908 case 3:
909 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
910 return -1;
911
912 *x_max = (0x0f & param[0]) << 8 | param[1];
913 *y_max = (0xf0 & param[0]) << 4 | param[2];
914 break;
915
916 case 4:
917 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
918 return -1;
919
920 *x_max = (0x0f & param[0]) << 8 | param[1];
921 *y_max = (0xf0 & param[0]) << 4 | param[2];
922 traces = etd->capabilities[1];
923 if ((traces < 2) || (traces > *x_max))
924 return -1;
925
926 *width = *x_max / (traces - 1);
927 break;
928 }
929
930 return 0;
931 }
932
933 /*
934 * (value from firmware) * 10 + 790 = dpi
935 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
936 */
937 static unsigned int elantech_convert_res(unsigned int val)
938 {
939 return (val * 10 + 790) * 10 / 254;
940 }
941
942 static int elantech_get_resolution_v4(struct psmouse *psmouse,
943 unsigned int *x_res,
944 unsigned int *y_res)
945 {
946 unsigned char param[3];
947
948 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
949 return -1;
950
951 *x_res = elantech_convert_res(param[1] & 0x0f);
952 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
953
954 return 0;
955 }
956
957 /*
958 * Set the appropriate event bits for the input subsystem
959 */
960 static int elantech_set_input_params(struct psmouse *psmouse)
961 {
962 struct input_dev *dev = psmouse->dev;
963 struct elantech_data *etd = psmouse->private;
964 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
965 unsigned int x_res = 0, y_res = 0;
966
967 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
968 return -1;
969
970 __set_bit(EV_KEY, dev->evbit);
971 __set_bit(EV_ABS, dev->evbit);
972 __clear_bit(EV_REL, dev->evbit);
973
974 __set_bit(BTN_LEFT, dev->keybit);
975 __set_bit(BTN_RIGHT, dev->keybit);
976
977 __set_bit(BTN_TOUCH, dev->keybit);
978 __set_bit(BTN_TOOL_FINGER, dev->keybit);
979 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
980 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
981
982 switch (etd->hw_version) {
983 case 1:
984 /* Rocker button */
985 if (etd->fw_version < 0x020000 &&
986 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
987 __set_bit(BTN_FORWARD, dev->keybit);
988 __set_bit(BTN_BACK, dev->keybit);
989 }
990 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
991 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
992 break;
993
994 case 2:
995 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
996 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
997 /* fall through */
998 case 3:
999 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1000 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1001 if (etd->reports_pressure) {
1002 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1003 ETP_PMAX_V2, 0, 0);
1004 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1005 ETP_WMAX_V2, 0, 0);
1006 }
1007 input_mt_init_slots(dev, 2);
1008 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1009 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1010 break;
1011
1012 case 4:
1013 if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
1014 /*
1015 * if query failed, print a warning and leave the values
1016 * zero to resemble synaptics.c behavior.
1017 */
1018 psmouse_warn(psmouse, "couldn't query resolution data.\n");
1019 }
1020
1021 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1022 /* For X to recognize me as touchpad. */
1023 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1024 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1025 input_abs_set_res(dev, ABS_X, x_res);
1026 input_abs_set_res(dev, ABS_Y, y_res);
1027 /*
1028 * range of pressure and width is the same as v2,
1029 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1030 */
1031 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1032 ETP_PMAX_V2, 0, 0);
1033 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1034 ETP_WMAX_V2, 0, 0);
1035 /* Multitouch capable pad, up to 5 fingers. */
1036 input_mt_init_slots(dev, ETP_MAX_FINGERS);
1037 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1038 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1039 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
1040 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
1041 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1042 ETP_PMAX_V2, 0, 0);
1043 /*
1044 * The firmware reports how many trace lines the finger spans,
1045 * convert to surface unit as Protocol-B requires.
1046 */
1047 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1048 ETP_WMAX_V2 * width, 0, 0);
1049 break;
1050 }
1051
1052 etd->y_max = y_max;
1053 etd->width = width;
1054
1055 return 0;
1056 }
1057
1058 struct elantech_attr_data {
1059 size_t field_offset;
1060 unsigned char reg;
1061 };
1062
1063 /*
1064 * Display a register value by reading a sysfs entry
1065 */
1066 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1067 char *buf)
1068 {
1069 struct elantech_data *etd = psmouse->private;
1070 struct elantech_attr_data *attr = data;
1071 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1072 int rc = 0;
1073
1074 if (attr->reg)
1075 rc = elantech_read_reg(psmouse, attr->reg, reg);
1076
1077 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1078 }
1079
1080 /*
1081 * Write a register value by writing a sysfs entry
1082 */
1083 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1084 void *data, const char *buf, size_t count)
1085 {
1086 struct elantech_data *etd = psmouse->private;
1087 struct elantech_attr_data *attr = data;
1088 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1089 unsigned char value;
1090 int err;
1091
1092 err = kstrtou8(buf, 16, &value);
1093 if (err)
1094 return err;
1095
1096 /* Do we need to preserve some bits for version 2 hardware too? */
1097 if (etd->hw_version == 1) {
1098 if (attr->reg == 0x10)
1099 /* Force absolute mode always on */
1100 value |= ETP_R10_ABSOLUTE_MODE;
1101 else if (attr->reg == 0x11)
1102 /* Force 4 byte mode always on */
1103 value |= ETP_R11_4_BYTE_MODE;
1104 }
1105
1106 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1107 *reg = value;
1108
1109 return count;
1110 }
1111
1112 #define ELANTECH_INT_ATTR(_name, _register) \
1113 static struct elantech_attr_data elantech_attr_##_name = { \
1114 .field_offset = offsetof(struct elantech_data, _name), \
1115 .reg = _register, \
1116 }; \
1117 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1118 &elantech_attr_##_name, \
1119 elantech_show_int_attr, \
1120 elantech_set_int_attr)
1121
1122 ELANTECH_INT_ATTR(reg_07, 0x07);
1123 ELANTECH_INT_ATTR(reg_10, 0x10);
1124 ELANTECH_INT_ATTR(reg_11, 0x11);
1125 ELANTECH_INT_ATTR(reg_20, 0x20);
1126 ELANTECH_INT_ATTR(reg_21, 0x21);
1127 ELANTECH_INT_ATTR(reg_22, 0x22);
1128 ELANTECH_INT_ATTR(reg_23, 0x23);
1129 ELANTECH_INT_ATTR(reg_24, 0x24);
1130 ELANTECH_INT_ATTR(reg_25, 0x25);
1131 ELANTECH_INT_ATTR(reg_26, 0x26);
1132 ELANTECH_INT_ATTR(debug, 0);
1133 ELANTECH_INT_ATTR(paritycheck, 0);
1134
1135 static struct attribute *elantech_attrs[] = {
1136 &psmouse_attr_reg_07.dattr.attr,
1137 &psmouse_attr_reg_10.dattr.attr,
1138 &psmouse_attr_reg_11.dattr.attr,
1139 &psmouse_attr_reg_20.dattr.attr,
1140 &psmouse_attr_reg_21.dattr.attr,
1141 &psmouse_attr_reg_22.dattr.attr,
1142 &psmouse_attr_reg_23.dattr.attr,
1143 &psmouse_attr_reg_24.dattr.attr,
1144 &psmouse_attr_reg_25.dattr.attr,
1145 &psmouse_attr_reg_26.dattr.attr,
1146 &psmouse_attr_debug.dattr.attr,
1147 &psmouse_attr_paritycheck.dattr.attr,
1148 NULL
1149 };
1150
1151 static struct attribute_group elantech_attr_group = {
1152 .attrs = elantech_attrs,
1153 };
1154
1155 static bool elantech_is_signature_valid(const unsigned char *param)
1156 {
1157 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1158 int i;
1159
1160 if (param[0] == 0)
1161 return false;
1162
1163 if (param[1] == 0)
1164 return true;
1165
1166 for (i = 0; i < ARRAY_SIZE(rates); i++)
1167 if (param[2] == rates[i])
1168 return false;
1169
1170 return true;
1171 }
1172
1173 /*
1174 * Use magic knock to detect Elantech touchpad
1175 */
1176 int elantech_detect(struct psmouse *psmouse, bool set_properties)
1177 {
1178 struct ps2dev *ps2dev = &psmouse->ps2dev;
1179 unsigned char param[3];
1180
1181 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1182
1183 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1184 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1185 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1186 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1187 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1188 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1189 return -1;
1190 }
1191
1192 /*
1193 * Report this in case there are Elantech models that use a different
1194 * set of magic numbers
1195 */
1196 if (param[0] != 0x3c || param[1] != 0x03 ||
1197 (param[2] != 0xc8 && param[2] != 0x00)) {
1198 psmouse_dbg(psmouse,
1199 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1200 param[0], param[1], param[2]);
1201 return -1;
1202 }
1203
1204 /*
1205 * Query touchpad's firmware version and see if it reports known
1206 * value to avoid mis-detection. Logitech mice are known to respond
1207 * to Elantech magic knock and there might be more.
1208 */
1209 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1210 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1211 return -1;
1212 }
1213
1214 psmouse_dbg(psmouse,
1215 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1216 param[0], param[1], param[2]);
1217
1218 if (!elantech_is_signature_valid(param)) {
1219 psmouse_dbg(psmouse,
1220 "Probably not a real Elantech touchpad. Aborting.\n");
1221 return -1;
1222 }
1223
1224 if (set_properties) {
1225 psmouse->vendor = "Elantech";
1226 psmouse->name = "Touchpad";
1227 }
1228
1229 return 0;
1230 }
1231
1232 /*
1233 * Clean up sysfs entries when disconnecting
1234 */
1235 static void elantech_disconnect(struct psmouse *psmouse)
1236 {
1237 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1238 &elantech_attr_group);
1239 kfree(psmouse->private);
1240 psmouse->private = NULL;
1241 }
1242
1243 /*
1244 * Put the touchpad back into absolute mode when reconnecting
1245 */
1246 static int elantech_reconnect(struct psmouse *psmouse)
1247 {
1248 if (elantech_detect(psmouse, 0))
1249 return -1;
1250
1251 if (elantech_set_absolute_mode(psmouse)) {
1252 psmouse_err(psmouse,
1253 "failed to put touchpad back into absolute mode.\n");
1254 return -1;
1255 }
1256
1257 return 0;
1258 }
1259
1260 /*
1261 * determine hardware version and set some properties according to it.
1262 */
1263 static int elantech_set_properties(struct elantech_data *etd)
1264 {
1265 /* This represents the version of IC body. */
1266 int ver = (etd->fw_version & 0x0f0000) >> 16;
1267
1268 /* Early version of Elan touchpads doesn't obey the rule. */
1269 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1270 etd->hw_version = 1;
1271 else {
1272 switch (ver) {
1273 case 2:
1274 case 4:
1275 etd->hw_version = 2;
1276 break;
1277 case 5:
1278 etd->hw_version = 3;
1279 break;
1280 case 6:
1281 etd->hw_version = 4;
1282 break;
1283 default:
1284 return -1;
1285 }
1286 }
1287
1288 /* decide which send_cmd we're gonna use early */
1289 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
1290 synaptics_send_cmd;
1291
1292 /* Turn on packet checking by default */
1293 etd->paritycheck = 1;
1294
1295 /*
1296 * This firmware suffers from misreporting coordinates when
1297 * a touch action starts causing the mouse cursor or scrolled page
1298 * to jump. Enable a workaround.
1299 */
1300 etd->jumpy_cursor =
1301 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1302
1303 if (etd->hw_version > 1) {
1304 /* For now show extra debug information */
1305 etd->debug = 1;
1306
1307 if (etd->fw_version >= 0x020800)
1308 etd->reports_pressure = true;
1309 }
1310
1311 return 0;
1312 }
1313
1314 /*
1315 * Initialize the touchpad and create sysfs entries
1316 */
1317 int elantech_init(struct psmouse *psmouse)
1318 {
1319 struct elantech_data *etd;
1320 int i, error;
1321 unsigned char param[3];
1322
1323 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
1324 if (!etd)
1325 return -ENOMEM;
1326
1327 etd->parity[0] = 1;
1328 for (i = 1; i < 256; i++)
1329 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1330
1331 /*
1332 * Do the version query again so we can store the result
1333 */
1334 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1335 psmouse_err(psmouse, "failed to query firmware version.\n");
1336 goto init_fail;
1337 }
1338 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1339
1340 if (elantech_set_properties(etd)) {
1341 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1342 goto init_fail;
1343 }
1344 psmouse_info(psmouse,
1345 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1346 etd->hw_version, param[0], param[1], param[2]);
1347
1348 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1349 etd->capabilities)) {
1350 psmouse_err(psmouse, "failed to query capabilities.\n");
1351 goto init_fail;
1352 }
1353 psmouse_info(psmouse,
1354 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1355 etd->capabilities[0], etd->capabilities[1],
1356 etd->capabilities[2]);
1357
1358 if (elantech_set_absolute_mode(psmouse)) {
1359 psmouse_err(psmouse,
1360 "failed to put touchpad into absolute mode.\n");
1361 goto init_fail;
1362 }
1363
1364 if (elantech_set_input_params(psmouse)) {
1365 psmouse_err(psmouse, "failed to query touchpad range.\n");
1366 goto init_fail;
1367 }
1368
1369 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1370 &elantech_attr_group);
1371 if (error) {
1372 psmouse_err(psmouse,
1373 "failed to create sysfs attributes, error: %d.\n",
1374 error);
1375 goto init_fail;
1376 }
1377
1378 psmouse->protocol_handler = elantech_process_byte;
1379 psmouse->disconnect = elantech_disconnect;
1380 psmouse->reconnect = elantech_reconnect;
1381 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
1382
1383 return 0;
1384
1385 init_fail:
1386 kfree(etd);
1387 return -1;
1388 }