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FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / input / mouse / elantech.c
blob04d9bf320a4f9c090b8d4f46aeca8e848bc4f988
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 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/input.h>
19 #include <linux/serio.h>
20 #include <linux/libps2.h>
21 #include "psmouse.h"
22 #include "elantech.h"
23
24 #define elantech_debug(fmt, ...) \
25 do { \
26 if (etd->debug) \
27 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
28 } while (0)
29
30 static bool force_elantech;
31 module_param_named(force_elantech, force_elantech, bool, 0644);
32 MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default).");
33
34 /*
35 * Send a Synaptics style sliced query command
36 */
37 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
38 unsigned char *param)
39 {
40 if (psmouse_sliced_command(psmouse, c) ||
41 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
42 pr_err("synaptics_send_cmd query 0x%02x failed.\n", c);
43 return -1;
44 }
45
46 return 0;
47 }
48
49 /*
50 * A retrying version of ps2_command
51 */
52 static int elantech_ps2_command(struct psmouse *psmouse,
53 unsigned char *param, int command)
54 {
55 struct ps2dev *ps2dev = &psmouse->ps2dev;
56 struct elantech_data *etd = psmouse->private;
57 int rc;
58 int tries = ETP_PS2_COMMAND_TRIES;
59
60 do {
61 rc = ps2_command(ps2dev, param, command);
62 if (rc == 0)
63 break;
64 tries--;
65 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
66 command, tries);
67 msleep(ETP_PS2_COMMAND_DELAY);
68 } while (tries > 0);
69
70 if (rc)
71 pr_err("ps2 command 0x%02x failed.\n", command);
72
73 return rc;
74 }
75
76 /*
77 * Send an Elantech style special command to read a value from a register
78 */
79 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
80 unsigned char *val)
81 {
82 struct elantech_data *etd = psmouse->private;
83 unsigned char param[3];
84 int rc = 0;
85
86 if (reg < 0x10 || reg > 0x26)
87 return -1;
88
89 if (reg > 0x11 && reg < 0x20)
90 return -1;
91
92 switch (etd->hw_version) {
93 case 1:
94 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
95 psmouse_sliced_command(psmouse, reg) ||
96 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
97 rc = -1;
98 }
99 break;
100
101 case 2:
102 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
103 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
104 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
105 elantech_ps2_command(psmouse, NULL, reg) ||
106 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
107 rc = -1;
108 }
109 break;
110 }
111
112 if (rc)
113 pr_err("failed to read register 0x%02x.\n", reg);
114 else
115 *val = param[0];
116
117 return rc;
118 }
119
120 /*
121 * Send an Elantech style special command to write a register with a value
122 */
123 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
124 unsigned char val)
125 {
126 struct elantech_data *etd = psmouse->private;
127 int rc = 0;
128
129 if (reg < 0x10 || reg > 0x26)
130 return -1;
131
132 if (reg > 0x11 && reg < 0x20)
133 return -1;
134
135 switch (etd->hw_version) {
136 case 1:
137 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
138 psmouse_sliced_command(psmouse, reg) ||
139 psmouse_sliced_command(psmouse, val) ||
140 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
141 rc = -1;
142 }
143 break;
144
145 case 2:
146 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
147 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
148 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
149 elantech_ps2_command(psmouse, NULL, reg) ||
150 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
151 elantech_ps2_command(psmouse, NULL, val) ||
152 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
153 rc = -1;
154 }
155 break;
156 }
157
158 if (rc)
159 pr_err("failed to write register 0x%02x with value 0x%02x.\n",
160 reg, val);
161
162 return rc;
163 }
164
165 /*
166 * Dump a complete mouse movement packet to the syslog
167 */
168 static void elantech_packet_dump(unsigned char *packet, int size)
169 {
170 int i;
171
172 printk(KERN_DEBUG pr_fmt("PS/2 packet ["));
173 for (i = 0; i < size; i++)
174 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
175 printk("]\n");
176 }
177
178 /*
179 * Interpret complete data packets and report absolute mode input events for
180 * hardware version 1. (4 byte packets)
181 */
182 static void elantech_report_absolute_v1(struct psmouse *psmouse)
183 {
184 struct input_dev *dev = psmouse->dev;
185 struct elantech_data *etd = psmouse->private;
186 unsigned char *packet = psmouse->packet;
187 int fingers;
188
189 if (etd->fw_version < 0x020000) {
190 /*
191 * byte 0: D U p1 p2 1 p3 R L
192 * byte 1: f 0 th tw x9 x8 y9 y8
193 */
194 fingers = ((packet[1] & 0x80) >> 7) +
195 ((packet[1] & 0x30) >> 4);
196 } else {
197 /*
198 * byte 0: n1 n0 p2 p1 1 p3 R L
199 * byte 1: 0 0 0 0 x9 x8 y9 y8
200 */
201 fingers = (packet[0] & 0xc0) >> 6;
202 }
203
204 if (etd->jumpy_cursor) {
205 if (fingers != 1) {
206 etd->single_finger_reports = 0;
207 } else if (etd->single_finger_reports < 2) {
208 /* Discard first 2 reports of one finger, bogus */
209 etd->single_finger_reports++;
210 elantech_debug("discarding packet\n");
211 return;
212 }
213 }
214
215 input_report_key(dev, BTN_TOUCH, fingers != 0);
216
217 /*
218 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
219 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
220 */
221 if (fingers) {
222 input_report_abs(dev, ABS_X,
223 ((packet[1] & 0x0c) << 6) | packet[2]);
224 input_report_abs(dev, ABS_Y,
225 ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3]));
226 }
227
228 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
229 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
230 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
231 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
232 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
233
234 if (etd->fw_version < 0x020000 &&
235 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
236 /* rocker up */
237 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
238 /* rocker down */
239 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
240 }
241
242 input_sync(dev);
243 }
244
245 /*
246 * Interpret complete data packets and report absolute mode input events for
247 * hardware version 2. (6 byte packets)
248 */
249 static void elantech_report_absolute_v2(struct psmouse *psmouse)
250 {
251 struct input_dev *dev = psmouse->dev;
252 unsigned char *packet = psmouse->packet;
253 int fingers, x1, y1, x2, y2;
254
255 /* byte 0: n1 n0 . . . . R L */
256 fingers = (packet[0] & 0xc0) >> 6;
257 input_report_key(dev, BTN_TOUCH, fingers != 0);
258
259 switch (fingers) {
260 case 3:
261 /*
262 * Same as one finger, except report of more than 3 fingers:
263 * byte 3: n4 . w1 w0 . . . .
264 */
265 if (packet[3] & 0x80)
266 fingers = 4;
267 /* pass through... */
268 case 1:
269 /*
270 * byte 1: . . . . . x10 x9 x8
271 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
272 */
273 input_report_abs(dev, ABS_X,
274 ((packet[1] & 0x07) << 8) | packet[2]);
275 /*
276 * byte 4: . . . . . . y9 y8
277 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
278 */
279 input_report_abs(dev, ABS_Y,
280 ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5]));
281 break;
282
283 case 2:
284 /*
285 * The coordinate of each finger is reported separately
286 * with a lower resolution for two finger touches:
287 * byte 0: . . ay8 ax8 . . . .
288 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
289 */
290 x1 = ((packet[0] & 0x10) << 4) | packet[1];
291 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
292 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
293 /*
294 * byte 3: . . by8 bx8 . . . .
295 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
296 */
297 x2 = ((packet[3] & 0x10) << 4) | packet[4];
298 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
299 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
300 /*
301 * For compatibility with the X Synaptics driver scale up
302 * one coordinate and report as ordinary mouse movent
303 */
304 input_report_abs(dev, ABS_X, x1 << 2);
305 input_report_abs(dev, ABS_Y, y1 << 2);
306 /*
307 * For compatibility with the proprietary X Elantech driver
308 * report both coordinates as hat coordinates
309 */
310 input_report_abs(dev, ABS_HAT0X, x1);
311 input_report_abs(dev, ABS_HAT0Y, y1);
312 input_report_abs(dev, ABS_HAT1X, x2);
313 input_report_abs(dev, ABS_HAT1Y, y2);
314 break;
315 }
316
317 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
318 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
319 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
320 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
321 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
322 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
323
324 input_sync(dev);
325 }
326
327 static int elantech_check_parity_v1(struct psmouse *psmouse)
328 {
329 struct elantech_data *etd = psmouse->private;
330 unsigned char *packet = psmouse->packet;
331 unsigned char p1, p2, p3;
332
333 /* Parity bits are placed differently */
334 if (etd->fw_version < 0x020000) {
335 /* byte 0: D U p1 p2 1 p3 R L */
336 p1 = (packet[0] & 0x20) >> 5;
337 p2 = (packet[0] & 0x10) >> 4;
338 } else {
339 /* byte 0: n1 n0 p2 p1 1 p3 R L */
340 p1 = (packet[0] & 0x10) >> 4;
341 p2 = (packet[0] & 0x20) >> 5;
342 }
343
344 p3 = (packet[0] & 0x04) >> 2;
345
346 return etd->parity[packet[1]] == p1 &&
347 etd->parity[packet[2]] == p2 &&
348 etd->parity[packet[3]] == p3;
349 }
350
351 /*
352 * Process byte stream from mouse and handle complete packets
353 */
354 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
355 {
356 struct elantech_data *etd = psmouse->private;
357
358 if (psmouse->pktcnt < psmouse->pktsize)
359 return PSMOUSE_GOOD_DATA;
360
361 if (etd->debug > 1)
362 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
363
364 switch (etd->hw_version) {
365 case 1:
366 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
367 return PSMOUSE_BAD_DATA;
368
369 elantech_report_absolute_v1(psmouse);
370 break;
371
372 case 2:
373 /* We don't know how to check parity in protocol v2 */
374 elantech_report_absolute_v2(psmouse);
375 break;
376 }
377
378 return PSMOUSE_FULL_PACKET;
379 }
380
381 /*
382 * Put the touchpad into absolute mode
383 */
384 static int elantech_set_absolute_mode(struct psmouse *psmouse)
385 {
386 struct elantech_data *etd = psmouse->private;
387 unsigned char val;
388 int tries = ETP_READ_BACK_TRIES;
389 int rc = 0;
390
391 switch (etd->hw_version) {
392 case 1:
393 etd->reg_10 = 0x16;
394 etd->reg_11 = 0x8f;
395 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
396 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
397 rc = -1;
398 }
399 break;
400
401 case 2:
402 /* Windows driver values */
403 etd->reg_10 = 0x54;
404 etd->reg_11 = 0x88; /* 0x8a */
405 etd->reg_21 = 0x60; /* 0x00 */
406 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
407 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
408 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
409 rc = -1;
410 break;
411 }
412 }
413
414 if (rc == 0) {
415 /*
416 * Read back reg 0x10. For hardware version 1 we must make
417 * sure the absolute mode bit is set. For hardware version 2
418 * the touchpad is probably initalising and not ready until
419 * we read back the value we just wrote.
420 */
421 do {
422 rc = elantech_read_reg(psmouse, 0x10, &val);
423 if (rc == 0)
424 break;
425 tries--;
426 elantech_debug("retrying read (%d).\n", tries);
427 msleep(ETP_READ_BACK_DELAY);
428 } while (tries > 0);
429
430 if (rc) {
431 pr_err("failed to read back register 0x10.\n");
432 } else if (etd->hw_version == 1 &&
433 !(val & ETP_R10_ABSOLUTE_MODE)) {
434 pr_err("touchpad refuses to switch to absolute mode.\n");
435 rc = -1;
436 }
437 }
438
439 if (rc)
440 pr_err("failed to initialise registers.\n");
441
442 return rc;
443 }
444
445 /*
446 * Set the appropriate event bits for the input subsystem
447 */
448 static void elantech_set_input_params(struct psmouse *psmouse)
449 {
450 struct input_dev *dev = psmouse->dev;
451 struct elantech_data *etd = psmouse->private;
452
453 __set_bit(EV_KEY, dev->evbit);
454 __set_bit(EV_ABS, dev->evbit);
455 __clear_bit(EV_REL, dev->evbit);
456
457 __set_bit(BTN_LEFT, dev->keybit);
458 __set_bit(BTN_RIGHT, dev->keybit);
459
460 __set_bit(BTN_TOUCH, dev->keybit);
461 __set_bit(BTN_TOOL_FINGER, dev->keybit);
462 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
463 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
464
465 switch (etd->hw_version) {
466 case 1:
467 /* Rocker button */
468 if (etd->fw_version < 0x020000 &&
469 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
470 __set_bit(BTN_FORWARD, dev->keybit);
471 __set_bit(BTN_BACK, dev->keybit);
472 }
473 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
474 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
475 break;
476
477 case 2:
478 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
479 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
480 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
481 input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
482 input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
483 input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
484 input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
485 break;
486 }
487 }
488
489 struct elantech_attr_data {
490 size_t field_offset;
491 unsigned char reg;
492 };
493
494 /*
495 * Display a register value by reading a sysfs entry
496 */
497 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
498 char *buf)
499 {
500 struct elantech_data *etd = psmouse->private;
501 struct elantech_attr_data *attr = data;
502 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
503 int rc = 0;
504
505 if (attr->reg)
506 rc = elantech_read_reg(psmouse, attr->reg, reg);
507
508 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
509 }
510
511 /*
512 * Write a register value by writing a sysfs entry
513 */
514 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
515 void *data, const char *buf, size_t count)
516 {
517 struct elantech_data *etd = psmouse->private;
518 struct elantech_attr_data *attr = data;
519 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
520 unsigned long value;
521 int err;
522
523 err = strict_strtoul(buf, 16, &value);
524 if (err)
525 return err;
526
527 if (value > 0xff)
528 return -EINVAL;
529
530 /* Do we need to preserve some bits for version 2 hardware too? */
531 if (etd->hw_version == 1) {
532 if (attr->reg == 0x10)
533 /* Force absolute mode always on */
534 value |= ETP_R10_ABSOLUTE_MODE;
535 else if (attr->reg == 0x11)
536 /* Force 4 byte mode always on */
537 value |= ETP_R11_4_BYTE_MODE;
538 }
539
540 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
541 *reg = value;
542
543 return count;
544 }
545
546 #define ELANTECH_INT_ATTR(_name, _register) \
547 static struct elantech_attr_data elantech_attr_##_name = { \
548 .field_offset = offsetof(struct elantech_data, _name), \
549 .reg = _register, \
550 }; \
551 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
552 &elantech_attr_##_name, \
553 elantech_show_int_attr, \
554 elantech_set_int_attr)
555
556 ELANTECH_INT_ATTR(reg_10, 0x10);
557 ELANTECH_INT_ATTR(reg_11, 0x11);
558 ELANTECH_INT_ATTR(reg_20, 0x20);
559 ELANTECH_INT_ATTR(reg_21, 0x21);
560 ELANTECH_INT_ATTR(reg_22, 0x22);
561 ELANTECH_INT_ATTR(reg_23, 0x23);
562 ELANTECH_INT_ATTR(reg_24, 0x24);
563 ELANTECH_INT_ATTR(reg_25, 0x25);
564 ELANTECH_INT_ATTR(reg_26, 0x26);
565 ELANTECH_INT_ATTR(debug, 0);
566 ELANTECH_INT_ATTR(paritycheck, 0);
567
568 static struct attribute *elantech_attrs[] = {
569 &psmouse_attr_reg_10.dattr.attr,
570 &psmouse_attr_reg_11.dattr.attr,
571 &psmouse_attr_reg_20.dattr.attr,
572 &psmouse_attr_reg_21.dattr.attr,
573 &psmouse_attr_reg_22.dattr.attr,
574 &psmouse_attr_reg_23.dattr.attr,
575 &psmouse_attr_reg_24.dattr.attr,
576 &psmouse_attr_reg_25.dattr.attr,
577 &psmouse_attr_reg_26.dattr.attr,
578 &psmouse_attr_debug.dattr.attr,
579 &psmouse_attr_paritycheck.dattr.attr,
580 NULL
581 };
582
583 static struct attribute_group elantech_attr_group = {
584 .attrs = elantech_attrs,
585 };
586
587 static bool elantech_is_signature_valid(const unsigned char *param)
588 {
589 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
590 int i;
591
592 if (param[0] == 0)
593 return false;
594
595 if (param[1] == 0)
596 return true;
597
598 for (i = 0; i < ARRAY_SIZE(rates); i++)
599 if (param[2] == rates[i])
600 return false;
601
602 return true;
603 }
604
605 /*
606 * Use magic knock to detect Elantech touchpad
607 */
608 int elantech_detect(struct psmouse *psmouse, bool set_properties)
609 {
610 struct ps2dev *ps2dev = &psmouse->ps2dev;
611 unsigned char param[3];
612
613 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
614
615 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
616 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
617 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
618 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
619 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
620 pr_debug("sending Elantech magic knock failed.\n");
621 return -1;
622 }
623
624 /*
625 * Report this in case there are Elantech models that use a different
626 * set of magic numbers
627 */
628 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
629 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
630 param[0], param[1], param[2]);
631 return -1;
632 }
633
634 /*
635 * Query touchpad's firmware version and see if it reports known
636 * value to avoid mis-detection. Logitech mice are known to respond
637 * to Elantech magic knock and there might be more.
638 */
639 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
640 pr_debug("failed to query firmware version.\n");
641 return -1;
642 }
643
644 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
645 param[0], param[1], param[2]);
646
647 if (!elantech_is_signature_valid(param)) {
648 if (!force_elantech) {
649 pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
650 return -1;
651 }
652
653 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
654 }
655
656 if (set_properties) {
657 psmouse->vendor = "Elantech";
658 psmouse->name = "Touchpad";
659 }
660
661 return 0;
662 }
663
664 /*
665 * Clean up sysfs entries when disconnecting
666 */
667 static void elantech_disconnect(struct psmouse *psmouse)
668 {
669 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
670 &elantech_attr_group);
671 kfree(psmouse->private);
672 psmouse->private = NULL;
673 }
674
675 /*
676 * Put the touchpad back into absolute mode when reconnecting
677 */
678 static int elantech_reconnect(struct psmouse *psmouse)
679 {
680 if (elantech_detect(psmouse, 0))
681 return -1;
682
683 if (elantech_set_absolute_mode(psmouse)) {
684 pr_err("failed to put touchpad back into absolute mode.\n");
685 return -1;
686 }
687
688 return 0;
689 }
690
691 /*
692 * Initialize the touchpad and create sysfs entries
693 */
694 int elantech_init(struct psmouse *psmouse)
695 {
696 struct elantech_data *etd;
697 int i, error;
698 unsigned char param[3];
699
700 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
701 if (!etd)
702 return -ENOMEM;
703
704 etd->parity[0] = 1;
705 for (i = 1; i < 256; i++)
706 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
707
708 /*
709 * Do the version query again so we can store the result
710 */
711 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
712 pr_err("failed to query firmware version.\n");
713 goto init_fail;
714 }
715
716 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
717
718 /*
719 * Assume every version greater than this is new EeePC style
720 * hardware with 6 byte packets
721 */
722 if (etd->fw_version >= 0x020030) {
723 etd->hw_version = 2;
724 /* For now show extra debug information */
725 etd->debug = 1;
726 /* Don't know how to do parity checking for version 2 */
727 etd->paritycheck = 0;
728 } else {
729 etd->hw_version = 1;
730 etd->paritycheck = 1;
731 }
732
733 pr_info("assuming hardware version %d, firmware version %d.%d.%d\n",
734 etd->hw_version, param[0], param[1], param[2]);
735
736 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
737 pr_err("failed to query capabilities.\n");
738 goto init_fail;
739 }
740 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
741 param[0], param[1], param[2]);
742 etd->capabilities = param[0];
743
744 /*
745 * This firmware suffers from misreporting coordinates when
746 * a touch action starts causing the mouse cursor or scrolled page
747 * to jump. Enable a workaround.
748 */
749 if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) {
750 pr_info("firmware version 2.0.34/2.6.0 detected, enabling jumpy cursor workaround\n");
751 etd->jumpy_cursor = true;
752 }
753
754 if (elantech_set_absolute_mode(psmouse)) {
755 pr_err("failed to put touchpad into absolute mode.\n");
756 goto init_fail;
757 }
758
759 elantech_set_input_params(psmouse);
760
761 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
762 &elantech_attr_group);
763 if (error) {
764 pr_err("failed to create sysfs attributes, error: %d.\n", error);
765 goto init_fail;
766 }
767
768 psmouse->protocol_handler = elantech_process_byte;
769 psmouse->disconnect = elantech_disconnect;
770 psmouse->reconnect = elantech_reconnect;
771 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
772
773 return 0;
774
775 init_fail:
776 kfree(etd);
777 return -1;
778 }
CRIS linux kernel tree