2 * Elantech Touchpad driver (v6)
4 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
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.
10 * Trademarks are the property of their respective owners.
13 #include <linux/delay.h>
14 #include <linux/module.h>
15 #include <linux/input.h>
16 #include <linux/serio.h>
17 #include <linux/libps2.h>
21 #define elantech_debug(format, arg...) \
24 printk(KERN_DEBUG format, ##arg); \
28 * Send a Synaptics style sliced query command
30 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
33 if (psmouse_sliced_command(psmouse, c) ||
34 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
35 pr_err("elantech.c: synaptics_send_cmd query 0x%02x failed.\n", c);
43 * A retrying version of ps2_command
45 static int elantech_ps2_command(struct psmouse *psmouse,
46 unsigned char *param, int command)
48 struct ps2dev *ps2dev = &psmouse->ps2dev;
49 struct elantech_data *etd = psmouse->private;
51 int tries = ETP_PS2_COMMAND_TRIES;
54 rc = ps2_command(ps2dev, param, command);
58 elantech_debug("elantech.c: retrying ps2 command 0x%02x (%d).\n",
60 msleep(ETP_PS2_COMMAND_DELAY);
64 pr_err("elantech.c: ps2 command 0x%02x failed.\n", command);
70 * Send an Elantech style special command to read a value from a register
72 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
75 struct elantech_data *etd = psmouse->private;
76 unsigned char param[3];
79 if (reg < 0x10 || reg > 0x26)
82 if (reg > 0x11 && reg < 0x20)
85 switch (etd->hw_version) {
87 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
88 psmouse_sliced_command(psmouse, reg) ||
89 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
95 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
96 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
97 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
98 elantech_ps2_command(psmouse, NULL, reg) ||
99 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
106 pr_err("elantech.c: failed to read register 0x%02x.\n", reg);
114 * Send an Elantech style special command to write a register with a value
116 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
119 struct elantech_data *etd = psmouse->private;
122 if (reg < 0x10 || reg > 0x26)
125 if (reg > 0x11 && reg < 0x20)
128 switch (etd->hw_version) {
130 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
131 psmouse_sliced_command(psmouse, reg) ||
132 psmouse_sliced_command(psmouse, val) ||
133 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
139 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
140 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
141 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
142 elantech_ps2_command(psmouse, NULL, reg) ||
143 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
144 elantech_ps2_command(psmouse, NULL, val) ||
145 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
152 pr_err("elantech.c: failed to write register 0x%02x with value 0x%02x.\n",
159 * Dump a complete mouse movement packet to the syslog
161 static void elantech_packet_dump(unsigned char *packet, int size)
165 printk(KERN_DEBUG "elantech.c: PS/2 packet [");
166 for (i = 0; i < size; i++)
167 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
172 * Interpret complete data packets and report absolute mode input events for
173 * hardware version 1. (4 byte packets)
175 static void elantech_report_absolute_v1(struct psmouse *psmouse)
177 struct input_dev *dev = psmouse->dev;
178 struct elantech_data *etd = psmouse->private;
179 unsigned char *packet = psmouse->packet;
181 static int old_fingers;
183 if (etd->fw_version_maj == 0x01) {
184 /* byte 0: D U p1 p2 1 p3 R L
185 byte 1: f 0 th tw x9 x8 y9 y8 */
186 fingers = ((packet[1] & 0x80) >> 7) +
187 ((packet[1] & 0x30) >> 4);
189 /* byte 0: n1 n0 p2 p1 1 p3 R L
190 byte 1: 0 0 0 0 x9 x8 y9 y8 */
191 fingers = (packet[0] & 0xc0) >> 6;
194 if (etd->jumpy_cursor) {
195 /* Discard packets that are likely to have bogus coordinates */
196 if (fingers > old_fingers) {
197 elantech_debug("elantech.c: discarding packet\n");
198 goto discard_packet_v1;
202 input_report_key(dev, BTN_TOUCH, fingers != 0);
204 /* byte 2: x7 x6 x5 x4 x3 x2 x1 x0
205 byte 3: y7 y6 y5 y4 y3 y2 y1 y0 */
207 input_report_abs(dev, ABS_X,
208 ((packet[1] & 0x0c) << 6) | packet[2]);
209 input_report_abs(dev, ABS_Y, ETP_YMAX_V1 -
210 (((packet[1] & 0x03) << 8) | packet[3]));
213 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
214 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
215 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
216 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
217 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
219 if ((etd->fw_version_maj == 0x01) &&
220 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
222 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
224 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
230 old_fingers = fingers;
234 * Interpret complete data packets and report absolute mode input events for
235 * hardware version 2. (6 byte packets)
237 static void elantech_report_absolute_v2(struct psmouse *psmouse)
239 struct input_dev *dev = psmouse->dev;
240 unsigned char *packet = psmouse->packet;
241 int fingers, x1, y1, x2, y2;
243 /* byte 0: n1 n0 . . . . R L */
244 fingers = (packet[0] & 0xc0) >> 6;
245 input_report_key(dev, BTN_TOUCH, fingers != 0);
249 /* byte 1: x15 x14 x13 x12 x11 x10 x9 x8
250 byte 2: x7 x6 x5 x4 x4 x2 x1 x0 */
251 input_report_abs(dev, ABS_X, (packet[1] << 8) | packet[2]);
252 /* byte 4: y15 y14 y13 y12 y11 y10 y8 y8
253 byte 5: y7 y6 y5 y4 y3 y2 y1 y0 */
254 input_report_abs(dev, ABS_Y, ETP_YMAX_V2 -
255 ((packet[4] << 8) | packet[5]));
259 /* The coordinate of each finger is reported separately with
260 a lower resolution for two finger touches */
261 /* byte 0: . . ay8 ax8 . . . .
262 byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 */
263 x1 = ((packet[0] & 0x10) << 4) | packet[1];
264 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
265 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
266 /* byte 3: . . by8 bx8 . . . .
267 byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 */
268 x2 = ((packet[3] & 0x10) << 4) | packet[4];
269 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
270 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
271 /* For compatibility with the X Synaptics driver scale up one
272 coordinate and report as ordinary mouse movent */
273 input_report_abs(dev, ABS_X, x1 << 2);
274 input_report_abs(dev, ABS_Y, y1 << 2);
275 /* For compatibility with the proprietary X Elantech driver
276 report both coordinates as hat coordinates */
277 input_report_abs(dev, ABS_HAT0X, x1);
278 input_report_abs(dev, ABS_HAT0Y, y1);
279 input_report_abs(dev, ABS_HAT1X, x2);
280 input_report_abs(dev, ABS_HAT1Y, y2);
284 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
285 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
286 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
287 input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
288 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
293 static int elantech_check_parity_v1(struct psmouse *psmouse)
295 struct elantech_data *etd = psmouse->private;
296 unsigned char *packet = psmouse->packet;
297 unsigned char p1, p2, p3;
299 /* Parity bits are placed differently */
300 if (etd->fw_version_maj == 0x01) {
301 /* byte 0: D U p1 p2 1 p3 R L */
302 p1 = (packet[0] & 0x20) >> 5;
303 p2 = (packet[0] & 0x10) >> 4;
305 /* byte 0: n1 n0 p2 p1 1 p3 R L */
306 p1 = (packet[0] & 0x10) >> 4;
307 p2 = (packet[0] & 0x20) >> 5;
310 p3 = (packet[0] & 0x04) >> 2;
312 return etd->parity[packet[1]] == p1 &&
313 etd->parity[packet[2]] == p2 &&
314 etd->parity[packet[3]] == p3;
318 * Process byte stream from mouse and handle complete packets
320 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
322 struct elantech_data *etd = psmouse->private;
324 if (psmouse->pktcnt < psmouse->pktsize)
325 return PSMOUSE_GOOD_DATA;
328 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
330 switch (etd->hw_version) {
332 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
333 return PSMOUSE_BAD_DATA;
335 elantech_report_absolute_v1(psmouse);
339 /* We don't know how to check parity in protocol v2 */
340 elantech_report_absolute_v2(psmouse);
344 return PSMOUSE_FULL_PACKET;
348 * Put the touchpad into absolute mode
350 static int elantech_set_absolute_mode(struct psmouse *psmouse)
352 struct elantech_data *etd = psmouse->private;
354 int tries = ETP_READ_BACK_TRIES;
357 switch (etd->hw_version) {
361 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
362 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
368 /* Windows driver values */
370 etd->reg_11 = 0x88; /* 0x8a */
371 etd->reg_21 = 0x60; /* 0x00 */
372 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
373 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
374 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
382 * Read back reg 0x10. For hardware version 1 we must make
383 * sure the absolute mode bit is set. For hardware version 2
384 * the touchpad is probably initalising and not ready until
385 * we read back the value we just wrote.
388 rc = elantech_read_reg(psmouse, 0x10, &val);
392 elantech_debug("elantech.c: retrying read (%d).\n",
394 msleep(ETP_READ_BACK_DELAY);
398 pr_err("elantech.c: failed to read back register 0x10.\n");
399 } else if (etd->hw_version == 1 &&
400 !(val & ETP_R10_ABSOLUTE_MODE)) {
401 pr_err("elantech.c: touchpad refuses "
402 "to switch to absolute mode.\n");
408 pr_err("elantech.c: failed to initialise registers.\n");
414 * Set the appropriate event bits for the input subsystem
416 static void elantech_set_input_params(struct psmouse *psmouse)
418 struct input_dev *dev = psmouse->dev;
419 struct elantech_data *etd = psmouse->private;
421 __set_bit(EV_KEY, dev->evbit);
422 __set_bit(EV_ABS, dev->evbit);
424 __set_bit(BTN_LEFT, dev->keybit);
425 __set_bit(BTN_RIGHT, dev->keybit);
427 __set_bit(BTN_TOUCH, dev->keybit);
428 __set_bit(BTN_TOOL_FINGER, dev->keybit);
429 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
430 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
432 switch (etd->hw_version) {
435 if ((etd->fw_version_maj == 0x01) &&
436 (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
437 __set_bit(BTN_FORWARD, dev->keybit);
438 __set_bit(BTN_BACK, dev->keybit);
440 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
441 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
445 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
446 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
447 input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
448 input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
449 input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
450 input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
455 struct elantech_attr_data {
461 * Display a register value by reading a sysfs entry
463 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
466 struct elantech_data *etd = psmouse->private;
467 struct elantech_attr_data *attr = data;
468 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
472 rc = elantech_read_reg(psmouse, attr->reg, reg);
474 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
478 * Write a register value by writing a sysfs entry
480 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
481 void *data, const char *buf, size_t count)
483 struct elantech_data *etd = psmouse->private;
484 struct elantech_attr_data *attr = data;
485 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
489 err = strict_strtoul(buf, 16, &value);
496 /* Do we need to preserve some bits for version 2 hardware too? */
497 if (etd->hw_version == 1) {
498 if (attr->reg == 0x10)
499 /* Force absolute mode always on */
500 value |= ETP_R10_ABSOLUTE_MODE;
501 else if (attr->reg == 0x11)
502 /* Force 4 byte mode always on */
503 value |= ETP_R11_4_BYTE_MODE;
506 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
512 #define ELANTECH_INT_ATTR(_name, _register) \
513 static struct elantech_attr_data elantech_attr_##_name = { \
514 .field_offset = offsetof(struct elantech_data, _name), \
517 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
518 &elantech_attr_##_name, \
519 elantech_show_int_attr, \
520 elantech_set_int_attr)
522 ELANTECH_INT_ATTR(reg_10, 0x10);
523 ELANTECH_INT_ATTR(reg_11, 0x11);
524 ELANTECH_INT_ATTR(reg_20, 0x20);
525 ELANTECH_INT_ATTR(reg_21, 0x21);
526 ELANTECH_INT_ATTR(reg_22, 0x22);
527 ELANTECH_INT_ATTR(reg_23, 0x23);
528 ELANTECH_INT_ATTR(reg_24, 0x24);
529 ELANTECH_INT_ATTR(reg_25, 0x25);
530 ELANTECH_INT_ATTR(reg_26, 0x26);
531 ELANTECH_INT_ATTR(debug, 0);
532 ELANTECH_INT_ATTR(paritycheck, 0);
534 static struct attribute *elantech_attrs[] = {
535 &psmouse_attr_reg_10.dattr.attr,
536 &psmouse_attr_reg_11.dattr.attr,
537 &psmouse_attr_reg_20.dattr.attr,
538 &psmouse_attr_reg_21.dattr.attr,
539 &psmouse_attr_reg_22.dattr.attr,
540 &psmouse_attr_reg_23.dattr.attr,
541 &psmouse_attr_reg_24.dattr.attr,
542 &psmouse_attr_reg_25.dattr.attr,
543 &psmouse_attr_reg_26.dattr.attr,
544 &psmouse_attr_debug.dattr.attr,
545 &psmouse_attr_paritycheck.dattr.attr,
549 static struct attribute_group elantech_attr_group = {
550 .attrs = elantech_attrs,
554 * Use magic knock to detect Elantech touchpad
556 int elantech_detect(struct psmouse *psmouse, int set_properties)
558 struct ps2dev *ps2dev = &psmouse->ps2dev;
559 unsigned char param[3];
561 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
563 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
564 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
565 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
566 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
567 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
568 pr_debug("elantech.c: sending Elantech magic knock failed.\n");
573 * Report this in case there are Elantech models that use a different
574 * set of magic numbers
576 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
577 pr_debug("elantech.c: "
578 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
579 param[0], param[1], param[2]);
584 * Query touchpad's firmware version and see if it reports known
585 * value to avoid mis-detection. Logitech mice are known to respond
586 * to Elantech magic knock and there might be more.
588 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
589 pr_debug("elantech.c: failed to query firmware version.\n");
593 pr_debug("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
594 param[0], param[1], param[2]);
596 if (param[0] == 0 || param[1] != 0) {
597 pr_debug("elantech.c: Probably not a real Elantech touchpad. Aborting.\n");
601 if (set_properties) {
602 psmouse->vendor = "Elantech";
603 psmouse->name = "Touchpad";
610 * Clean up sysfs entries when disconnecting
612 static void elantech_disconnect(struct psmouse *psmouse)
614 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
615 &elantech_attr_group);
616 kfree(psmouse->private);
617 psmouse->private = NULL;
621 * Put the touchpad back into absolute mode when reconnecting
623 static int elantech_reconnect(struct psmouse *psmouse)
625 if (elantech_detect(psmouse, 0))
628 if (elantech_set_absolute_mode(psmouse)) {
629 pr_err("elantech.c: failed to put touchpad back into absolute mode.\n");
637 * Initialize the touchpad and create sysfs entries
639 int elantech_init(struct psmouse *psmouse)
641 struct elantech_data *etd;
643 unsigned char param[3];
645 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
650 for (i = 1; i < 256; i++)
651 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
654 * Do the version query again so we can store the result
656 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
657 pr_err("elantech.c: failed to query firmware version.\n");
660 etd->fw_version_maj = param[0];
661 etd->fw_version_min = param[2];
664 * Assume every version greater than this is new EeePC style
665 * hardware with 6 byte packets
667 if (etd->fw_version_maj >= 0x02 && etd->fw_version_min >= 0x30) {
669 /* For now show extra debug information */
671 /* Don't know how to do parity checking for version 2 */
672 etd->paritycheck = 0;
675 etd->paritycheck = 1;
677 pr_info("elantech.c: assuming hardware version %d, firmware version %d.%d\n",
678 etd->hw_version, etd->fw_version_maj, etd->fw_version_min);
680 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
681 pr_err("elantech.c: failed to query capabilities.\n");
684 pr_info("elantech.c: Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
685 param[0], param[1], param[2]);
686 etd->capabilities = param[0];
689 * This firmware seems to suffer from misreporting coordinates when
690 * a touch action starts causing the mouse cursor or scrolled page
691 * to jump. Enable a workaround.
693 if (etd->fw_version_maj == 0x02 && etd->fw_version_min == 0x22) {
694 pr_info("elantech.c: firmware version 2.34 detected, "
695 "enabling jumpy cursor workaround\n");
696 etd->jumpy_cursor = 1;
699 if (elantech_set_absolute_mode(psmouse)) {
700 pr_err("elantech.c: failed to put touchpad into absolute mode.\n");
704 elantech_set_input_params(psmouse);
706 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
707 &elantech_attr_group);
709 pr_err("elantech.c: failed to create sysfs attributes, error: %d.\n",
714 psmouse->protocol_handler = elantech_process_byte;
715 psmouse->disconnect = elantech_disconnect;
716 psmouse->reconnect = elantech_reconnect;
717 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;