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uwb: Use kcalloc instead of kzalloc to allocate array
[zen-stable.git] / drivers / input / mouse / elantech.c
blobe2a9867c19d52fce53cac578bdaf265d3211bba1
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 * A retrying version of ps2_command
47 */
48 static int elantech_ps2_command(struct psmouse *psmouse,
49 unsigned char *param, int command)
50 {
51 struct ps2dev *ps2dev = &psmouse->ps2dev;
52 struct elantech_data *etd = psmouse->private;
53 int rc;
54 int tries = ETP_PS2_COMMAND_TRIES;
55
56 do {
57 rc = ps2_command(ps2dev, param, command);
58 if (rc == 0)
59 break;
60 tries--;
61 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
62 command, tries);
63 msleep(ETP_PS2_COMMAND_DELAY);
64 } while (tries > 0);
65
66 if (rc)
67 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
68
69 return rc;
70 }
71
72 /*
73 * Send an Elantech style special command to read a value from a register
74 */
75 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
76 unsigned char *val)
77 {
78 struct elantech_data *etd = psmouse->private;
79 unsigned char param[3];
80 int rc = 0;
81
82 if (reg < 0x07 || reg > 0x26)
83 return -1;
84
85 if (reg > 0x11 && reg < 0x20)
86 return -1;
87
88 switch (etd->hw_version) {
89 case 1:
90 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
91 psmouse_sliced_command(psmouse, reg) ||
92 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
93 rc = -1;
94 }
95 break;
96
97 case 2:
98 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
99 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
100 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
101 elantech_ps2_command(psmouse, NULL, reg) ||
102 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
103 rc = -1;
104 }
105 break;
106
107 case 3 ... 4:
108 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
109 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
110 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
111 elantech_ps2_command(psmouse, NULL, reg) ||
112 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
113 rc = -1;
114 }
115 break;
116 }
117
118 if (rc)
119 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
120 else if (etd->hw_version != 4)
121 *val = param[0];
122 else
123 *val = param[1];
124
125 return rc;
126 }
127
128 /*
129 * Send an Elantech style special command to write a register with a value
130 */
131 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
132 unsigned char val)
133 {
134 struct elantech_data *etd = psmouse->private;
135 int rc = 0;
136
137 if (reg < 0x07 || reg > 0x26)
138 return -1;
139
140 if (reg > 0x11 && reg < 0x20)
141 return -1;
142
143 switch (etd->hw_version) {
144 case 1:
145 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
146 psmouse_sliced_command(psmouse, reg) ||
147 psmouse_sliced_command(psmouse, val) ||
148 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
149 rc = -1;
150 }
151 break;
152
153 case 2:
154 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
155 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
156 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
157 elantech_ps2_command(psmouse, NULL, reg) ||
158 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
159 elantech_ps2_command(psmouse, NULL, val) ||
160 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
161 rc = -1;
162 }
163 break;
164
165 case 3:
166 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
167 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
168 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
169 elantech_ps2_command(psmouse, NULL, reg) ||
170 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
171 elantech_ps2_command(psmouse, NULL, val) ||
172 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
173 rc = -1;
174 }
175 break;
176
177 case 4:
178 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
179 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
180 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
181 elantech_ps2_command(psmouse, NULL, reg) ||
182 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
183 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
184 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
185 elantech_ps2_command(psmouse, NULL, val) ||
186 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
187 rc = -1;
188 }
189 break;
190 }
191
192 if (rc)
193 psmouse_err(psmouse,
194 "failed to write register 0x%02x with value 0x%02x.\n",
195 reg, val);
196
197 return rc;
198 }
199
200 /*
201 * Dump a complete mouse movement packet to the syslog
202 */
203 static void elantech_packet_dump(struct psmouse *psmouse)
204 {
205 int i;
206
207 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
208 for (i = 0; i < psmouse->pktsize; i++)
209 printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
210 printk("]\n");
211 }
212
213 /*
214 * Interpret complete data packets and report absolute mode input events for
215 * hardware version 1. (4 byte packets)
216 */
217 static void elantech_report_absolute_v1(struct psmouse *psmouse)
218 {
219 struct input_dev *dev = psmouse->dev;
220 struct elantech_data *etd = psmouse->private;
221 unsigned char *packet = psmouse->packet;
222 int fingers;
223
224 if (etd->fw_version < 0x020000) {
225 /*
226 * byte 0: D U p1 p2 1 p3 R L
227 * byte 1: f 0 th tw x9 x8 y9 y8
228 */
229 fingers = ((packet[1] & 0x80) >> 7) +
230 ((packet[1] & 0x30) >> 4);
231 } else {
232 /*
233 * byte 0: n1 n0 p2 p1 1 p3 R L
234 * byte 1: 0 0 0 0 x9 x8 y9 y8
235 */
236 fingers = (packet[0] & 0xc0) >> 6;
237 }
238
239 if (etd->jumpy_cursor) {
240 if (fingers != 1) {
241 etd->single_finger_reports = 0;
242 } else if (etd->single_finger_reports < 2) {
243 /* Discard first 2 reports of one finger, bogus */
244 etd->single_finger_reports++;
245 elantech_debug("discarding packet\n");
246 return;
247 }
248 }
249
250 input_report_key(dev, BTN_TOUCH, fingers != 0);
251
252 /*
253 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
254 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
255 */
256 if (fingers) {
257 input_report_abs(dev, ABS_X,
258 ((packet[1] & 0x0c) << 6) | packet[2]);
259 input_report_abs(dev, ABS_Y,
260 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
261 }
262
263 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
264 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
265 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
266 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
267 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
268
269 if (etd->fw_version < 0x020000 &&
270 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
271 /* rocker up */
272 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
273 /* rocker down */
274 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
275 }
276
277 input_sync(dev);
278 }
279
280 static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
281 unsigned int x, unsigned int y)
282 {
283 input_mt_slot(dev, slot);
284 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
285 if (active) {
286 input_report_abs(dev, ABS_MT_POSITION_X, x);
287 input_report_abs(dev, ABS_MT_POSITION_Y, y);
288 }
289 }
290
291 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
292 static void elantech_report_semi_mt_data(struct input_dev *dev,
293 unsigned int num_fingers,
294 unsigned int x1, unsigned int y1,
295 unsigned int x2, unsigned int y2)
296 {
297 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
298 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
299 }
300
301 /*
302 * Interpret complete data packets and report absolute mode input events for
303 * hardware version 2. (6 byte packets)
304 */
305 static void elantech_report_absolute_v2(struct psmouse *psmouse)
306 {
307 struct elantech_data *etd = psmouse->private;
308 struct input_dev *dev = psmouse->dev;
309 unsigned char *packet = psmouse->packet;
310 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
311 unsigned int width = 0, pres = 0;
312
313 /* byte 0: n1 n0 . . . . R L */
314 fingers = (packet[0] & 0xc0) >> 6;
315
316 switch (fingers) {
317 case 3:
318 /*
319 * Same as one finger, except report of more than 3 fingers:
320 * byte 3: n4 . w1 w0 . . . .
321 */
322 if (packet[3] & 0x80)
323 fingers = 4;
324 /* pass through... */
325 case 1:
326 /*
327 * byte 1: . . . . x11 x10 x9 x8
328 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
329 */
330 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
331 /*
332 * byte 4: . . . . y11 y10 y9 y8
333 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
334 */
335 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
336
337 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
338 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
339 break;
340
341 case 2:
342 /*
343 * The coordinate of each finger is reported separately
344 * with a lower resolution for two finger touches:
345 * byte 0: . . ay8 ax8 . . . .
346 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
347 */
348 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
349 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
350 y1 = etd->y_max -
351 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
352 /*
353 * byte 3: . . by8 bx8 . . . .
354 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
355 */
356 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
357 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
358 y2 = etd->y_max -
359 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
360
361 /* Unknown so just report sensible values */
362 pres = 127;
363 width = 7;
364 break;
365 }
366
367 input_report_key(dev, BTN_TOUCH, fingers != 0);
368 if (fingers != 0) {
369 input_report_abs(dev, ABS_X, x1);
370 input_report_abs(dev, ABS_Y, y1);
371 }
372 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
373 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
374 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
375 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
376 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
377 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
378 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
379 if (etd->reports_pressure) {
380 input_report_abs(dev, ABS_PRESSURE, pres);
381 input_report_abs(dev, ABS_TOOL_WIDTH, width);
382 }
383
384 input_sync(dev);
385 }
386
387 /*
388 * Interpret complete data packets and report absolute mode input events for
389 * hardware version 3. (12 byte packets for two fingers)
390 */
391 static void elantech_report_absolute_v3(struct psmouse *psmouse,
392 int packet_type)
393 {
394 struct input_dev *dev = psmouse->dev;
395 struct elantech_data *etd = psmouse->private;
396 unsigned char *packet = psmouse->packet;
397 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
398 unsigned int width = 0, pres = 0;
399
400 /* byte 0: n1 n0 . . . . R L */
401 fingers = (packet[0] & 0xc0) >> 6;
402
403 switch (fingers) {
404 case 3:
405 case 1:
406 /*
407 * byte 1: . . . . x11 x10 x9 x8
408 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
409 */
410 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
411 /*
412 * byte 4: . . . . y11 y10 y9 y8
413 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
414 */
415 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
416 break;
417
418 case 2:
419 if (packet_type == PACKET_V3_HEAD) {
420 /*
421 * byte 1: . . . . ax11 ax10 ax9 ax8
422 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
423 */
424 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
425 /*
426 * byte 4: . . . . ay11 ay10 ay9 ay8
427 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
428 */
429 etd->mt[0].y = etd->y_max -
430 (((packet[4] & 0x0f) << 8) | packet[5]);
431 /*
432 * wait for next packet
433 */
434 return;
435 }
436
437 /* packet_type == PACKET_V3_TAIL */
438 x1 = etd->mt[0].x;
439 y1 = etd->mt[0].y;
440 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
441 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
442 break;
443 }
444
445 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
446 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
447
448 input_report_key(dev, BTN_TOUCH, fingers != 0);
449 if (fingers != 0) {
450 input_report_abs(dev, ABS_X, x1);
451 input_report_abs(dev, ABS_Y, y1);
452 }
453 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
454 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
455 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
456 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
457 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
458 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
459 input_report_abs(dev, ABS_PRESSURE, pres);
460 input_report_abs(dev, ABS_TOOL_WIDTH, width);
461
462 input_sync(dev);
463 }
464
465 static void elantech_input_sync_v4(struct psmouse *psmouse)
466 {
467 struct input_dev *dev = psmouse->dev;
468 unsigned char *packet = psmouse->packet;
469
470 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
471 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
472 input_mt_report_pointer_emulation(dev, true);
473 input_sync(dev);
474 }
475
476 static void process_packet_status_v4(struct psmouse *psmouse)
477 {
478 struct input_dev *dev = psmouse->dev;
479 unsigned char *packet = psmouse->packet;
480 unsigned fingers;
481 int i;
482
483 /* notify finger state change */
484 fingers = packet[1] & 0x1f;
485 for (i = 0; i < ETP_MAX_FINGERS; i++) {
486 if ((fingers & (1 << i)) == 0) {
487 input_mt_slot(dev, i);
488 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
489 }
490 }
491
492 elantech_input_sync_v4(psmouse);
493 }
494
495 static void process_packet_head_v4(struct psmouse *psmouse)
496 {
497 struct input_dev *dev = psmouse->dev;
498 struct elantech_data *etd = psmouse->private;
499 unsigned char *packet = psmouse->packet;
500 int id = ((packet[3] & 0xe0) >> 5) - 1;
501 int pres, traces;
502
503 if (id < 0)
504 return;
505
506 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
507 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
508 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
509 traces = (packet[0] & 0xf0) >> 4;
510
511 input_mt_slot(dev, id);
512 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
513
514 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
515 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
516 input_report_abs(dev, ABS_MT_PRESSURE, pres);
517 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
518 /* report this for backwards compatibility */
519 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
520
521 elantech_input_sync_v4(psmouse);
522 }
523
524 static void process_packet_motion_v4(struct psmouse *psmouse)
525 {
526 struct input_dev *dev = psmouse->dev;
527 struct elantech_data *etd = psmouse->private;
528 unsigned char *packet = psmouse->packet;
529 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
530 int id, sid;
531
532 id = ((packet[0] & 0xe0) >> 5) - 1;
533 if (id < 0)
534 return;
535
536 sid = ((packet[3] & 0xe0) >> 5) - 1;
537 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
538 /*
539 * Motion packets give us the delta of x, y values of specific fingers,
540 * but in two's complement. Let the compiler do the conversion for us.
541 * Also _enlarge_ the numbers to int, in case of overflow.
542 */
543 delta_x1 = (signed char)packet[1];
544 delta_y1 = (signed char)packet[2];
545 delta_x2 = (signed char)packet[4];
546 delta_y2 = (signed char)packet[5];
547
548 etd->mt[id].x += delta_x1 * weight;
549 etd->mt[id].y -= delta_y1 * weight;
550 input_mt_slot(dev, id);
551 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
552 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
553
554 if (sid >= 0) {
555 etd->mt[sid].x += delta_x2 * weight;
556 etd->mt[sid].y -= delta_y2 * weight;
557 input_mt_slot(dev, sid);
558 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
559 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
560 }
561
562 elantech_input_sync_v4(psmouse);
563 }
564
565 static void elantech_report_absolute_v4(struct psmouse *psmouse,
566 int packet_type)
567 {
568 switch (packet_type) {
569 case PACKET_V4_STATUS:
570 process_packet_status_v4(psmouse);
571 break;
572
573 case PACKET_V4_HEAD:
574 process_packet_head_v4(psmouse);
575 break;
576
577 case PACKET_V4_MOTION:
578 process_packet_motion_v4(psmouse);
579 break;
580
581 case PACKET_UNKNOWN:
582 default:
583 /* impossible to get here */
584 break;
585 }
586 }
587
588 static int elantech_packet_check_v1(struct psmouse *psmouse)
589 {
590 struct elantech_data *etd = psmouse->private;
591 unsigned char *packet = psmouse->packet;
592 unsigned char p1, p2, p3;
593
594 /* Parity bits are placed differently */
595 if (etd->fw_version < 0x020000) {
596 /* byte 0: D U p1 p2 1 p3 R L */
597 p1 = (packet[0] & 0x20) >> 5;
598 p2 = (packet[0] & 0x10) >> 4;
599 } else {
600 /* byte 0: n1 n0 p2 p1 1 p3 R L */
601 p1 = (packet[0] & 0x10) >> 4;
602 p2 = (packet[0] & 0x20) >> 5;
603 }
604
605 p3 = (packet[0] & 0x04) >> 2;
606
607 return etd->parity[packet[1]] == p1 &&
608 etd->parity[packet[2]] == p2 &&
609 etd->parity[packet[3]] == p3;
610 }
611
612 static int elantech_debounce_check_v2(struct psmouse *psmouse)
613 {
614 /*
615 * When we encounter packet that matches this exactly, it means the
616 * hardware is in debounce status. Just ignore the whole packet.
617 */
618 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
619 unsigned char *packet = psmouse->packet;
620
621 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
622 }
623
624 static int elantech_packet_check_v2(struct psmouse *psmouse)
625 {
626 struct elantech_data *etd = psmouse->private;
627 unsigned char *packet = psmouse->packet;
628
629 /*
630 * V2 hardware has two flavors. Older ones that do not report pressure,
631 * and newer ones that reports pressure and width. With newer ones, all
632 * packets (1, 2, 3 finger touch) have the same constant bits. With
633 * older ones, 1/3 finger touch packets and 2 finger touch packets
634 * have different constant bits.
635 * With all three cases, if the constant bits are not exactly what I
636 * expected, I consider them invalid.
637 */
638 if (etd->reports_pressure)
639 return (packet[0] & 0x0c) == 0x04 &&
640 (packet[3] & 0x0f) == 0x02;
641
642 if ((packet[0] & 0xc0) == 0x80)
643 return (packet[0] & 0x0c) == 0x0c &&
644 (packet[3] & 0x0e) == 0x08;
645
646 return (packet[0] & 0x3c) == 0x3c &&
647 (packet[1] & 0xf0) == 0x00 &&
648 (packet[3] & 0x3e) == 0x38 &&
649 (packet[4] & 0xf0) == 0x00;
650 }
651
652 /*
653 * We check the constant bits to determine what packet type we get,
654 * so packet checking is mandatory for v3 and later hardware.
655 */
656 static int elantech_packet_check_v3(struct psmouse *psmouse)
657 {
658 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
659 unsigned char *packet = psmouse->packet;
660
661 /*
662 * check debounce first, it has the same signature in byte 0
663 * and byte 3 as PACKET_V3_HEAD.
664 */
665 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
666 return PACKET_DEBOUNCE;
667
668 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
669 return PACKET_V3_HEAD;
670
671 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
672 return PACKET_V3_TAIL;
673
674 return PACKET_UNKNOWN;
675 }
676
677 static int elantech_packet_check_v4(struct psmouse *psmouse)
678 {
679 unsigned char *packet = psmouse->packet;
680
681 if ((packet[0] & 0x0c) == 0x04 &&
682 (packet[3] & 0x1f) == 0x11)
683 return PACKET_V4_HEAD;
684
685 if ((packet[0] & 0x0c) == 0x04 &&
686 (packet[3] & 0x1f) == 0x12)
687 return PACKET_V4_MOTION;
688
689 if ((packet[0] & 0x0c) == 0x04 &&
690 (packet[3] & 0x1f) == 0x10)
691 return PACKET_V4_STATUS;
692
693 return PACKET_UNKNOWN;
694 }
695
696 /*
697 * Process byte stream from mouse and handle complete packets
698 */
699 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
700 {
701 struct elantech_data *etd = psmouse->private;
702 int packet_type;
703
704 if (psmouse->pktcnt < psmouse->pktsize)
705 return PSMOUSE_GOOD_DATA;
706
707 if (etd->debug > 1)
708 elantech_packet_dump(psmouse);
709
710 switch (etd->hw_version) {
711 case 1:
712 if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
713 return PSMOUSE_BAD_DATA;
714
715 elantech_report_absolute_v1(psmouse);
716 break;
717
718 case 2:
719 /* ignore debounce */
720 if (elantech_debounce_check_v2(psmouse))
721 return PSMOUSE_FULL_PACKET;
722
723 if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
724 return PSMOUSE_BAD_DATA;
725
726 elantech_report_absolute_v2(psmouse);
727 break;
728
729 case 3:
730 packet_type = elantech_packet_check_v3(psmouse);
731 /* ignore debounce */
732 if (packet_type == PACKET_DEBOUNCE)
733 return PSMOUSE_FULL_PACKET;
734
735 if (packet_type == PACKET_UNKNOWN)
736 return PSMOUSE_BAD_DATA;
737
738 elantech_report_absolute_v3(psmouse, packet_type);
739 break;
740
741 case 4:
742 packet_type = elantech_packet_check_v4(psmouse);
743 if (packet_type == PACKET_UNKNOWN)
744 return PSMOUSE_BAD_DATA;
745
746 elantech_report_absolute_v4(psmouse, packet_type);
747 break;
748 }
749
750 return PSMOUSE_FULL_PACKET;
751 }
752
753 /*
754 * Put the touchpad into absolute mode
755 */
756 static int elantech_set_absolute_mode(struct psmouse *psmouse)
757 {
758 struct elantech_data *etd = psmouse->private;
759 unsigned char val;
760 int tries = ETP_READ_BACK_TRIES;
761 int rc = 0;
762
763 switch (etd->hw_version) {
764 case 1:
765 etd->reg_10 = 0x16;
766 etd->reg_11 = 0x8f;
767 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
768 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
769 rc = -1;
770 }
771 break;
772
773 case 2:
774 /* Windows driver values */
775 etd->reg_10 = 0x54;
776 etd->reg_11 = 0x88; /* 0x8a */
777 etd->reg_21 = 0x60; /* 0x00 */
778 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
779 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
780 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
781 rc = -1;
782 }
783 break;
784
785 case 3:
786 etd->reg_10 = 0x0b;
787 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
788 rc = -1;
789
790 break;
791
792 case 4:
793 etd->reg_07 = 0x01;
794 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
795 rc = -1;
796
797 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
798 }
799
800 if (rc == 0) {
801 /*
802 * Read back reg 0x10. For hardware version 1 we must make
803 * sure the absolute mode bit is set. For hardware version 2
804 * the touchpad is probably initializing and not ready until
805 * we read back the value we just wrote.
806 */
807 do {
808 rc = elantech_read_reg(psmouse, 0x10, &val);
809 if (rc == 0)
810 break;
811 tries--;
812 elantech_debug("retrying read (%d).\n", tries);
813 msleep(ETP_READ_BACK_DELAY);
814 } while (tries > 0);
815
816 if (rc) {
817 psmouse_err(psmouse,
818 "failed to read back register 0x10.\n");
819 } else if (etd->hw_version == 1 &&
820 !(val & ETP_R10_ABSOLUTE_MODE)) {
821 psmouse_err(psmouse,
822 "touchpad refuses to switch to absolute mode.\n");
823 rc = -1;
824 }
825 }
826
827 skip_readback_reg_10:
828 if (rc)
829 psmouse_err(psmouse, "failed to initialise registers.\n");
830
831 return rc;
832 }
833
834 static int elantech_set_range(struct psmouse *psmouse,
835 unsigned int *x_min, unsigned int *y_min,
836 unsigned int *x_max, unsigned int *y_max,
837 unsigned int *width)
838 {
839 struct elantech_data *etd = psmouse->private;
840 unsigned char param[3];
841 unsigned char traces;
842
843 switch (etd->hw_version) {
844 case 1:
845 *x_min = ETP_XMIN_V1;
846 *y_min = ETP_YMIN_V1;
847 *x_max = ETP_XMAX_V1;
848 *y_max = ETP_YMAX_V1;
849 break;
850
851 case 2:
852 if (etd->fw_version == 0x020800 ||
853 etd->fw_version == 0x020b00 ||
854 etd->fw_version == 0x020030) {
855 *x_min = ETP_XMIN_V2;
856 *y_min = ETP_YMIN_V2;
857 *x_max = ETP_XMAX_V2;
858 *y_max = ETP_YMAX_V2;
859 } else {
860 int i;
861 int fixed_dpi;
862
863 i = (etd->fw_version > 0x020800 &&
864 etd->fw_version < 0x020900) ? 1 : 2;
865
866 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
867 return -1;
868
869 fixed_dpi = param[1] & 0x10;
870
871 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
872 if (synaptics_send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
873 return -1;
874
875 *x_max = (etd->capabilities[1] - i) * param[1] / 2;
876 *y_max = (etd->capabilities[2] - i) * param[2] / 2;
877 } else if (etd->fw_version == 0x040216) {
878 *x_max = 819;
879 *y_max = 405;
880 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
881 *x_max = 900;
882 *y_max = 500;
883 } else {
884 *x_max = (etd->capabilities[1] - i) * 64;
885 *y_max = (etd->capabilities[2] - i) * 64;
886 }
887 }
888 break;
889
890 case 3:
891 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
892 return -1;
893
894 *x_max = (0x0f & param[0]) << 8 | param[1];
895 *y_max = (0xf0 & param[0]) << 4 | param[2];
896 break;
897
898 case 4:
899 if (synaptics_send_cmd(psmouse, ETP_FW_ID_QUERY, param))
900 return -1;
901
902 *x_max = (0x0f & param[0]) << 8 | param[1];
903 *y_max = (0xf0 & param[0]) << 4 | param[2];
904 traces = etd->capabilities[1];
905 if ((traces < 2) || (traces > *x_max))
906 return -1;
907
908 *width = *x_max / (traces - 1);
909 break;
910 }
911
912 return 0;
913 }
914
915 /*
916 * Set the appropriate event bits for the input subsystem
917 */
918 static int elantech_set_input_params(struct psmouse *psmouse)
919 {
920 struct input_dev *dev = psmouse->dev;
921 struct elantech_data *etd = psmouse->private;
922 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
923
924 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
925 return -1;
926
927 __set_bit(EV_KEY, dev->evbit);
928 __set_bit(EV_ABS, dev->evbit);
929 __clear_bit(EV_REL, dev->evbit);
930
931 __set_bit(BTN_LEFT, dev->keybit);
932 __set_bit(BTN_RIGHT, dev->keybit);
933
934 __set_bit(BTN_TOUCH, dev->keybit);
935 __set_bit(BTN_TOOL_FINGER, dev->keybit);
936 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
937 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
938
939 switch (etd->hw_version) {
940 case 1:
941 /* Rocker button */
942 if (etd->fw_version < 0x020000 &&
943 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
944 __set_bit(BTN_FORWARD, dev->keybit);
945 __set_bit(BTN_BACK, dev->keybit);
946 }
947 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
948 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
949 break;
950
951 case 2:
952 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
953 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
954 /* fall through */
955 case 3:
956 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
957 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
958 if (etd->reports_pressure) {
959 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
960 ETP_PMAX_V2, 0, 0);
961 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
962 ETP_WMAX_V2, 0, 0);
963 }
964 input_mt_init_slots(dev, 2);
965 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
966 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
967 break;
968
969 case 4:
970 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
971 /* For X to recognize me as touchpad. */
972 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
973 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
974 /*
975 * range of pressure and width is the same as v2,
976 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
977 */
978 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
979 ETP_PMAX_V2, 0, 0);
980 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
981 ETP_WMAX_V2, 0, 0);
982 /* Multitouch capable pad, up to 5 fingers. */
983 input_mt_init_slots(dev, ETP_MAX_FINGERS);
984 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
985 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
986 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
987 ETP_PMAX_V2, 0, 0);
988 /*
989 * The firmware reports how many trace lines the finger spans,
990 * convert to surface unit as Protocol-B requires.
991 */
992 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
993 ETP_WMAX_V2 * width, 0, 0);
994 break;
995 }
996
997 etd->y_max = y_max;
998 etd->width = width;
999
1000 return 0;
1001 }
1002
1003 struct elantech_attr_data {
1004 size_t field_offset;
1005 unsigned char reg;
1006 };
1007
1008 /*
1009 * Display a register value by reading a sysfs entry
1010 */
1011 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1012 char *buf)
1013 {
1014 struct elantech_data *etd = psmouse->private;
1015 struct elantech_attr_data *attr = data;
1016 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1017 int rc = 0;
1018
1019 if (attr->reg)
1020 rc = elantech_read_reg(psmouse, attr->reg, reg);
1021
1022 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1023 }
1024
1025 /*
1026 * Write a register value by writing a sysfs entry
1027 */
1028 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1029 void *data, const char *buf, size_t count)
1030 {
1031 struct elantech_data *etd = psmouse->private;
1032 struct elantech_attr_data *attr = data;
1033 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1034 unsigned long value;
1035 int err;
1036
1037 err = strict_strtoul(buf, 16, &value);
1038 if (err)
1039 return err;
1040
1041 if (value > 0xff)
1042 return -EINVAL;
1043
1044 /* Do we need to preserve some bits for version 2 hardware too? */
1045 if (etd->hw_version == 1) {
1046 if (attr->reg == 0x10)
1047 /* Force absolute mode always on */
1048 value |= ETP_R10_ABSOLUTE_MODE;
1049 else if (attr->reg == 0x11)
1050 /* Force 4 byte mode always on */
1051 value |= ETP_R11_4_BYTE_MODE;
1052 }
1053
1054 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1055 *reg = value;
1056
1057 return count;
1058 }
1059
1060 #define ELANTECH_INT_ATTR(_name, _register) \
1061 static struct elantech_attr_data elantech_attr_##_name = { \
1062 .field_offset = offsetof(struct elantech_data, _name), \
1063 .reg = _register, \
1064 }; \
1065 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
1066 &elantech_attr_##_name, \
1067 elantech_show_int_attr, \
1068 elantech_set_int_attr)
1069
1070 ELANTECH_INT_ATTR(reg_07, 0x07);
1071 ELANTECH_INT_ATTR(reg_10, 0x10);
1072 ELANTECH_INT_ATTR(reg_11, 0x11);
1073 ELANTECH_INT_ATTR(reg_20, 0x20);
1074 ELANTECH_INT_ATTR(reg_21, 0x21);
1075 ELANTECH_INT_ATTR(reg_22, 0x22);
1076 ELANTECH_INT_ATTR(reg_23, 0x23);
1077 ELANTECH_INT_ATTR(reg_24, 0x24);
1078 ELANTECH_INT_ATTR(reg_25, 0x25);
1079 ELANTECH_INT_ATTR(reg_26, 0x26);
1080 ELANTECH_INT_ATTR(debug, 0);
1081 ELANTECH_INT_ATTR(paritycheck, 0);
1082
1083 static struct attribute *elantech_attrs[] = {
1084 &psmouse_attr_reg_07.dattr.attr,
1085 &psmouse_attr_reg_10.dattr.attr,
1086 &psmouse_attr_reg_11.dattr.attr,
1087 &psmouse_attr_reg_20.dattr.attr,
1088 &psmouse_attr_reg_21.dattr.attr,
1089 &psmouse_attr_reg_22.dattr.attr,
1090 &psmouse_attr_reg_23.dattr.attr,
1091 &psmouse_attr_reg_24.dattr.attr,
1092 &psmouse_attr_reg_25.dattr.attr,
1093 &psmouse_attr_reg_26.dattr.attr,
1094 &psmouse_attr_debug.dattr.attr,
1095 &psmouse_attr_paritycheck.dattr.attr,
1096 NULL
1097 };
1098
1099 static struct attribute_group elantech_attr_group = {
1100 .attrs = elantech_attrs,
1101 };
1102
1103 static bool elantech_is_signature_valid(const unsigned char *param)
1104 {
1105 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1106 int i;
1107
1108 if (param[0] == 0)
1109 return false;
1110
1111 if (param[1] == 0)
1112 return true;
1113
1114 for (i = 0; i < ARRAY_SIZE(rates); i++)
1115 if (param[2] == rates[i])
1116 return false;
1117
1118 return true;
1119 }
1120
1121 /*
1122 * Use magic knock to detect Elantech touchpad
1123 */
1124 int elantech_detect(struct psmouse *psmouse, bool set_properties)
1125 {
1126 struct ps2dev *ps2dev = &psmouse->ps2dev;
1127 unsigned char param[3];
1128
1129 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1130
1131 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1132 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1133 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1134 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1135 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1136 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1137 return -1;
1138 }
1139
1140 /*
1141 * Report this in case there are Elantech models that use a different
1142 * set of magic numbers
1143 */
1144 if (param[0] != 0x3c || param[1] != 0x03 ||
1145 (param[2] != 0xc8 && param[2] != 0x00)) {
1146 psmouse_dbg(psmouse,
1147 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1148 param[0], param[1], param[2]);
1149 return -1;
1150 }
1151
1152 /*
1153 * Query touchpad's firmware version and see if it reports known
1154 * value to avoid mis-detection. Logitech mice are known to respond
1155 * to Elantech magic knock and there might be more.
1156 */
1157 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1158 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1159 return -1;
1160 }
1161
1162 psmouse_dbg(psmouse,
1163 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1164 param[0], param[1], param[2]);
1165
1166 if (!elantech_is_signature_valid(param)) {
1167 psmouse_dbg(psmouse,
1168 "Probably not a real Elantech touchpad. Aborting.\n");
1169 return -1;
1170 }
1171
1172 if (set_properties) {
1173 psmouse->vendor = "Elantech";
1174 psmouse->name = "Touchpad";
1175 }
1176
1177 return 0;
1178 }
1179
1180 /*
1181 * Clean up sysfs entries when disconnecting
1182 */
1183 static void elantech_disconnect(struct psmouse *psmouse)
1184 {
1185 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1186 &elantech_attr_group);
1187 kfree(psmouse->private);
1188 psmouse->private = NULL;
1189 }
1190
1191 /*
1192 * Put the touchpad back into absolute mode when reconnecting
1193 */
1194 static int elantech_reconnect(struct psmouse *psmouse)
1195 {
1196 if (elantech_detect(psmouse, 0))
1197 return -1;
1198
1199 if (elantech_set_absolute_mode(psmouse)) {
1200 psmouse_err(psmouse,
1201 "failed to put touchpad back into absolute mode.\n");
1202 return -1;
1203 }
1204
1205 return 0;
1206 }
1207
1208 /*
1209 * determine hardware version and set some properties according to it.
1210 */
1211 static int elantech_set_properties(struct elantech_data *etd)
1212 {
1213 /* This represents the version of IC body. */
1214 int ver = (etd->fw_version & 0x0f0000) >> 16;
1215
1216 /* Early version of Elan touchpads doesn't obey the rule. */
1217 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1218 etd->hw_version = 1;
1219 else {
1220 switch (ver) {
1221 case 2:
1222 case 4:
1223 etd->hw_version = 2;
1224 break;
1225 case 5:
1226 etd->hw_version = 3;
1227 break;
1228 case 6:
1229 etd->hw_version = 4;
1230 break;
1231 default:
1232 return -1;
1233 }
1234 }
1235
1236 /*
1237 * Turn on packet checking by default.
1238 */
1239 etd->paritycheck = 1;
1240
1241 /*
1242 * This firmware suffers from misreporting coordinates when
1243 * a touch action starts causing the mouse cursor or scrolled page
1244 * to jump. Enable a workaround.
1245 */
1246 etd->jumpy_cursor =
1247 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1248
1249 if (etd->hw_version > 1) {
1250 /* For now show extra debug information */
1251 etd->debug = 1;
1252
1253 if (etd->fw_version >= 0x020800)
1254 etd->reports_pressure = true;
1255 }
1256
1257 return 0;
1258 }
1259
1260 /*
1261 * Initialize the touchpad and create sysfs entries
1262 */
1263 int elantech_init(struct psmouse *psmouse)
1264 {
1265 struct elantech_data *etd;
1266 int i, error;
1267 unsigned char param[3];
1268
1269 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
1270 if (!etd)
1271 return -ENOMEM;
1272
1273 etd->parity[0] = 1;
1274 for (i = 1; i < 256; i++)
1275 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1276
1277 /*
1278 * Do the version query again so we can store the result
1279 */
1280 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1281 psmouse_err(psmouse, "failed to query firmware version.\n");
1282 goto init_fail;
1283 }
1284 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1285
1286 if (elantech_set_properties(etd)) {
1287 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1288 goto init_fail;
1289 }
1290 psmouse_info(psmouse,
1291 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1292 etd->hw_version, param[0], param[1], param[2]);
1293
1294 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1295 etd->capabilities)) {
1296 psmouse_err(psmouse, "failed to query capabilities.\n");
1297 goto init_fail;
1298 }
1299 psmouse_info(psmouse,
1300 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1301 etd->capabilities[0], etd->capabilities[1],
1302 etd->capabilities[2]);
1303
1304 if (elantech_set_absolute_mode(psmouse)) {
1305 psmouse_err(psmouse,
1306 "failed to put touchpad into absolute mode.\n");
1307 goto init_fail;
1308 }
1309
1310 if (elantech_set_input_params(psmouse)) {
1311 psmouse_err(psmouse, "failed to query touchpad range.\n");
1312 goto init_fail;
1313 }
1314
1315 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1316 &elantech_attr_group);
1317 if (error) {
1318 psmouse_err(psmouse,
1319 "failed to create sysfs attributes, error: %d.\n",
1320 error);
1321 goto init_fail;
1322 }
1323
1324 psmouse->protocol_handler = elantech_process_byte;
1325 psmouse->disconnect = elantech_disconnect;
1326 psmouse->reconnect = elantech_reconnect;
1327 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
1328
1329 return 0;
1330
1331 init_fail:
1332 kfree(etd);
1333 return -1;
1334 }