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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Elantech Touchpad driver (v6)
4 *
5 * Copyright (C) 2007-2009 Arjan Opmeer <[email protected]>
6 *
7 * Trademarks are the property of their respective owners.
8 */
9
10#include <linux/delay.h>
11#include <linux/dmi.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/i2c.h>
15#include <linux/input.h>
16#include <linux/input/mt.h>
17#include <linux/platform_device.h>
18#include <linux/serio.h>
19#include <linux/libps2.h>
20#include <linux/unaligned.h>
21#include "psmouse.h"
22#include "elantech.h"
23#include "elan_i2c.h"
24
25#define elantech_debug(fmt, ...) \
26 do { \
27 if (etd->info.debug) \
28 psmouse_printk(KERN_DEBUG, psmouse, \
29 fmt, ##__VA_ARGS__); \
30 } while (0)
31
32/*
33 * Send a Synaptics style sliced query command
34 */
35static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
36 unsigned char *param)
37{
38 if (ps2_sliced_command(&psmouse->ps2dev, c) ||
39 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
40 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
41 return -1;
42 }
43
44 return 0;
45}
46
47/*
48 * V3 and later support this fast command
49 */
50static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
51 unsigned char *param)
52{
53 struct ps2dev *ps2dev = &psmouse->ps2dev;
54
55 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
56 ps2_command(ps2dev, NULL, c) ||
57 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
58 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
59 return -1;
60 }
61
62 return 0;
63}
64
65/*
66 * A retrying version of ps2_command
67 */
68static int elantech_ps2_command(struct psmouse *psmouse,
69 unsigned char *param, int command)
70{
71 struct ps2dev *ps2dev = &psmouse->ps2dev;
72 struct elantech_data *etd = psmouse->private;
73 int rc;
74 int tries = ETP_PS2_COMMAND_TRIES;
75
76 do {
77 rc = ps2_command(ps2dev, param, command);
78 if (rc == 0)
79 break;
80 tries--;
81 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
82 command, tries);
83 msleep(ETP_PS2_COMMAND_DELAY);
84 } while (tries > 0);
85
86 if (rc)
87 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
88
89 return rc;
90}
91
92/*
93 * Send an Elantech style special command to read 3 bytes from a register
94 */
95static int elantech_read_reg_params(struct psmouse *psmouse, u8 reg, u8 *param)
96{
97 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
98 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
99 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
100 elantech_ps2_command(psmouse, NULL, reg) ||
101 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
102 psmouse_err(psmouse,
103 "failed to read register %#02x\n", reg);
104 return -EIO;
105 }
106
107 return 0;
108}
109
110/*
111 * Send an Elantech style special command to write a register with a parameter
112 */
113static int elantech_write_reg_params(struct psmouse *psmouse, u8 reg, u8 *param)
114{
115 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
116 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
117 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
118 elantech_ps2_command(psmouse, NULL, reg) ||
119 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
120 elantech_ps2_command(psmouse, NULL, param[0]) ||
121 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
122 elantech_ps2_command(psmouse, NULL, param[1]) ||
123 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
124 psmouse_err(psmouse,
125 "failed to write register %#02x with value %#02x%#02x\n",
126 reg, param[0], param[1]);
127 return -EIO;
128 }
129
130 return 0;
131}
132
133/*
134 * Send an Elantech style special command to read a value from a register
135 */
136static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
137 unsigned char *val)
138{
139 struct elantech_data *etd = psmouse->private;
140 unsigned char param[3];
141 int rc = 0;
142
143 if (reg < 0x07 || reg > 0x26)
144 return -1;
145
146 if (reg > 0x11 && reg < 0x20)
147 return -1;
148
149 switch (etd->info.hw_version) {
150 case 1:
151 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_READ) ||
152 ps2_sliced_command(&psmouse->ps2dev, reg) ||
153 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
154 rc = -1;
155 }
156 break;
157
158 case 2:
159 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
160 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
161 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
162 elantech_ps2_command(psmouse, NULL, reg) ||
163 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
164 rc = -1;
165 }
166 break;
167
168 case 3 ... 4:
169 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
170 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
171 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
172 elantech_ps2_command(psmouse, NULL, reg) ||
173 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
174 rc = -1;
175 }
176 break;
177 }
178
179 if (rc)
180 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
181 else if (etd->info.hw_version != 4)
182 *val = param[0];
183 else
184 *val = param[1];
185
186 return rc;
187}
188
189/*
190 * Send an Elantech style special command to write a register with a value
191 */
192static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
193 unsigned char val)
194{
195 struct elantech_data *etd = psmouse->private;
196 int rc = 0;
197
198 if (reg < 0x07 || reg > 0x26)
199 return -1;
200
201 if (reg > 0x11 && reg < 0x20)
202 return -1;
203
204 switch (etd->info.hw_version) {
205 case 1:
206 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_WRITE) ||
207 ps2_sliced_command(&psmouse->ps2dev, reg) ||
208 ps2_sliced_command(&psmouse->ps2dev, val) ||
209 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
210 rc = -1;
211 }
212 break;
213
214 case 2:
215 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
216 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
217 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
218 elantech_ps2_command(psmouse, NULL, reg) ||
219 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
220 elantech_ps2_command(psmouse, NULL, val) ||
221 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
222 rc = -1;
223 }
224 break;
225
226 case 3:
227 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
228 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
229 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
230 elantech_ps2_command(psmouse, NULL, reg) ||
231 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
232 elantech_ps2_command(psmouse, NULL, val) ||
233 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
234 rc = -1;
235 }
236 break;
237
238 case 4:
239 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
240 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
241 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
242 elantech_ps2_command(psmouse, NULL, reg) ||
243 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
244 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
245 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
246 elantech_ps2_command(psmouse, NULL, val) ||
247 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
248 rc = -1;
249 }
250 break;
251 }
252
253 if (rc)
254 psmouse_err(psmouse,
255 "failed to write register 0x%02x with value 0x%02x.\n",
256 reg, val);
257
258 return rc;
259}
260
261/*
262 * Dump a complete mouse movement packet to the syslog
263 */
264static void elantech_packet_dump(struct psmouse *psmouse)
265{
266 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]\n",
267 psmouse->pktsize, psmouse->packet);
268}
269
270/*
271 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
272 * fw_version for this is based on the following fw_version & caps table:
273 *
274 * Laptop-model: fw_version: caps: buttons:
275 * Acer S3 0x461f00 10, 13, 0e clickpad
276 * Acer S7-392 0x581f01 50, 17, 0d clickpad
277 * Acer V5-131 0x461f02 01, 16, 0c clickpad
278 * Acer V5-551 0x461f00 ? clickpad
279 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons
280 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons
281 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons
282 * Asus TP500LN 0x381f17 10, 14, 0e clickpad
283 * Asus X750JN 0x381f17 10, 14, 0e clickpad
284 * Asus UX31 0x361f00 20, 15, 0e clickpad
285 * Asus UX32VD 0x361f02 00, 15, 0e clickpad
286 * Avatar AVIU-145A2 0x361f00 ? clickpad
287 * Fujitsu CELSIUS H760 0x570f02 40, 14, 0c 3 hw buttons (**)
288 * Fujitsu CELSIUS H780 0x5d0f02 41, 16, 0d 3 hw buttons (**)
289 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons
290 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons
291 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons
292 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons
293 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons
294 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons
295 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**)
296 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons
297 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*)
298 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*)
299 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons
300 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad
301 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad
302 * Samsung NP900X3E-A02 0x575f03 ? clickpad
303 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad
304 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons
305 * Samsung RF710 0x450f00 ? 2 hw buttons
306 * System76 Pangolin 0x250f01 ? 2 hw buttons
307 * (*) + 3 trackpoint buttons
308 * (**) + 0 trackpoint buttons
309 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps
310 */
311static inline int elantech_is_buttonpad(struct elantech_device_info *info)
312{
313 return info->fw_version & 0x001000;
314}
315
316/*
317 * Interpret complete data packets and report absolute mode input events for
318 * hardware version 1. (4 byte packets)
319 */
320static void elantech_report_absolute_v1(struct psmouse *psmouse)
321{
322 struct input_dev *dev = psmouse->dev;
323 struct elantech_data *etd = psmouse->private;
324 unsigned char *packet = psmouse->packet;
325 int fingers;
326
327 if (etd->info.fw_version < 0x020000) {
328 /*
329 * byte 0: D U p1 p2 1 p3 R L
330 * byte 1: f 0 th tw x9 x8 y9 y8
331 */
332 fingers = ((packet[1] & 0x80) >> 7) +
333 ((packet[1] & 0x30) >> 4);
334 } else {
335 /*
336 * byte 0: n1 n0 p2 p1 1 p3 R L
337 * byte 1: 0 0 0 0 x9 x8 y9 y8
338 */
339 fingers = (packet[0] & 0xc0) >> 6;
340 }
341
342 if (etd->info.jumpy_cursor) {
343 if (fingers != 1) {
344 etd->single_finger_reports = 0;
345 } else if (etd->single_finger_reports < 2) {
346 /* Discard first 2 reports of one finger, bogus */
347 etd->single_finger_reports++;
348 elantech_debug("discarding packet\n");
349 return;
350 }
351 }
352
353 input_report_key(dev, BTN_TOUCH, fingers != 0);
354
355 /*
356 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0
357 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0
358 */
359 if (fingers) {
360 input_report_abs(dev, ABS_X,
361 ((packet[1] & 0x0c) << 6) | packet[2]);
362 input_report_abs(dev, ABS_Y,
363 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
364 }
365
366 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
367 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
368 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
369
370 psmouse_report_standard_buttons(dev, packet[0]);
371
372 if (etd->info.fw_version < 0x020000 &&
373 (etd->info.capabilities[0] & ETP_CAP_HAS_ROCKER)) {
374 /* rocker up */
375 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
376 /* rocker down */
377 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
378 }
379
380 input_sync(dev);
381}
382
383static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
384 unsigned int x, unsigned int y)
385{
386 input_mt_slot(dev, slot);
387 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
388 if (active) {
389 input_report_abs(dev, ABS_MT_POSITION_X, x);
390 input_report_abs(dev, ABS_MT_POSITION_Y, y);
391 }
392}
393
394/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
395static void elantech_report_semi_mt_data(struct input_dev *dev,
396 unsigned int num_fingers,
397 unsigned int x1, unsigned int y1,
398 unsigned int x2, unsigned int y2)
399{
400 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
401 elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2);
402}
403
404/*
405 * Interpret complete data packets and report absolute mode input events for
406 * hardware version 2. (6 byte packets)
407 */
408static void elantech_report_absolute_v2(struct psmouse *psmouse)
409{
410 struct elantech_data *etd = psmouse->private;
411 struct input_dev *dev = psmouse->dev;
412 unsigned char *packet = psmouse->packet;
413 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
414 unsigned int width = 0, pres = 0;
415
416 /* byte 0: n1 n0 . . . . R L */
417 fingers = (packet[0] & 0xc0) >> 6;
418
419 switch (fingers) {
420 case 3:
421 /*
422 * Same as one finger, except report of more than 3 fingers:
423 * byte 3: n4 . w1 w0 . . . .
424 */
425 if (packet[3] & 0x80)
426 fingers = 4;
427 fallthrough;
428 case 1:
429 /*
430 * byte 1: . . . . x11 x10 x9 x8
431 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
432 */
433 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
434 /*
435 * byte 4: . . . . y11 y10 y9 y8
436 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
437 */
438 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
439
440 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
441 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
442 break;
443
444 case 2:
445 /*
446 * The coordinate of each finger is reported separately
447 * with a lower resolution for two finger touches:
448 * byte 0: . . ay8 ax8 . . . .
449 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
450 */
451 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
452 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
453 y1 = etd->y_max -
454 ((((packet[0] & 0x20) << 3) | packet[2]) << 2);
455 /*
456 * byte 3: . . by8 bx8 . . . .
457 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
458 */
459 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
460 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
461 y2 = etd->y_max -
462 ((((packet[3] & 0x20) << 3) | packet[5]) << 2);
463
464 /* Unknown so just report sensible values */
465 pres = 127;
466 width = 7;
467 break;
468 }
469
470 input_report_key(dev, BTN_TOUCH, fingers != 0);
471 if (fingers != 0) {
472 input_report_abs(dev, ABS_X, x1);
473 input_report_abs(dev, ABS_Y, y1);
474 }
475 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
476 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
477 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
478 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
479 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
480 psmouse_report_standard_buttons(dev, packet[0]);
481 if (etd->info.reports_pressure) {
482 input_report_abs(dev, ABS_PRESSURE, pres);
483 input_report_abs(dev, ABS_TOOL_WIDTH, width);
484 }
485
486 input_sync(dev);
487}
488
489static void elantech_report_trackpoint(struct psmouse *psmouse,
490 int packet_type)
491{
492 /*
493 * byte 0: 0 0 sx sy 0 M R L
494 * byte 1:~sx 0 0 0 0 0 0 0
495 * byte 2:~sy 0 0 0 0 0 0 0
496 * byte 3: 0 0 ~sy ~sx 0 1 1 0
497 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0
498 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
499 *
500 * x and y are written in two's complement spread
501 * over 9 bits with sx/sy the relative top bit and
502 * x7..x0 and y7..y0 the lower bits.
503 * The sign of y is opposite to what the input driver
504 * expects for a relative movement
505 */
506
507 struct elantech_data *etd = psmouse->private;
508 struct input_dev *tp_dev = etd->tp_dev;
509 unsigned char *packet = psmouse->packet;
510 int x, y;
511 u32 t;
512
513 t = get_unaligned_le32(&packet[0]);
514
515 switch (t & ~7U) {
516 case 0x06000030U:
517 case 0x16008020U:
518 case 0x26800010U:
519 case 0x36808000U:
520
521 /*
522 * This firmware misreport coordinates for trackpoint
523 * occasionally. Discard packets outside of [-127, 127] range
524 * to prevent cursor jumps.
525 */
526 if (packet[4] == 0x80 || packet[5] == 0x80 ||
527 packet[1] >> 7 == packet[4] >> 7 ||
528 packet[2] >> 7 == packet[5] >> 7) {
529 elantech_debug("discarding packet [%6ph]\n", packet);
530 break;
531
532 }
533 x = packet[4] - (int)((packet[1]^0x80) << 1);
534 y = (int)((packet[2]^0x80) << 1) - packet[5];
535
536 psmouse_report_standard_buttons(tp_dev, packet[0]);
537
538 input_report_rel(tp_dev, REL_X, x);
539 input_report_rel(tp_dev, REL_Y, y);
540
541 input_sync(tp_dev);
542
543 break;
544
545 default:
546 /* Dump unexpected packet sequences if debug=1 (default) */
547 if (etd->info.debug == 1)
548 elantech_packet_dump(psmouse);
549
550 break;
551 }
552}
553
554/*
555 * Interpret complete data packets and report absolute mode input events for
556 * hardware version 3. (12 byte packets for two fingers)
557 */
558static void elantech_report_absolute_v3(struct psmouse *psmouse,
559 int packet_type)
560{
561 struct input_dev *dev = psmouse->dev;
562 struct elantech_data *etd = psmouse->private;
563 unsigned char *packet = psmouse->packet;
564 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
565 unsigned int width = 0, pres = 0;
566
567 /* byte 0: n1 n0 . . . . R L */
568 fingers = (packet[0] & 0xc0) >> 6;
569
570 switch (fingers) {
571 case 3:
572 case 1:
573 /*
574 * byte 1: . . . . x11 x10 x9 x8
575 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0
576 */
577 x1 = ((packet[1] & 0x0f) << 8) | packet[2];
578 /*
579 * byte 4: . . . . y11 y10 y9 y8
580 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0
581 */
582 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
583 break;
584
585 case 2:
586 if (packet_type == PACKET_V3_HEAD) {
587 /*
588 * byte 1: . . . . ax11 ax10 ax9 ax8
589 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
590 */
591 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
592 /*
593 * byte 4: . . . . ay11 ay10 ay9 ay8
594 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
595 */
596 etd->mt[0].y = etd->y_max -
597 (((packet[4] & 0x0f) << 8) | packet[5]);
598 /*
599 * wait for next packet
600 */
601 return;
602 }
603
604 /* packet_type == PACKET_V3_TAIL */
605 x1 = etd->mt[0].x;
606 y1 = etd->mt[0].y;
607 x2 = ((packet[1] & 0x0f) << 8) | packet[2];
608 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
609 break;
610 }
611
612 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
613 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
614
615 input_report_key(dev, BTN_TOUCH, fingers != 0);
616 if (fingers != 0) {
617 input_report_abs(dev, ABS_X, x1);
618 input_report_abs(dev, ABS_Y, y1);
619 }
620 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
621 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
622 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
623 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
624
625 /* For clickpads map both buttons to BTN_LEFT */
626 if (elantech_is_buttonpad(&etd->info))
627 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
628 else
629 psmouse_report_standard_buttons(dev, packet[0]);
630
631 input_report_abs(dev, ABS_PRESSURE, pres);
632 input_report_abs(dev, ABS_TOOL_WIDTH, width);
633
634 input_sync(dev);
635}
636
637static void elantech_input_sync_v4(struct psmouse *psmouse)
638{
639 struct input_dev *dev = psmouse->dev;
640 struct elantech_data *etd = psmouse->private;
641 unsigned char *packet = psmouse->packet;
642
643 /* For clickpads map both buttons to BTN_LEFT */
644 if (elantech_is_buttonpad(&etd->info))
645 input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
646 else
647 psmouse_report_standard_buttons(dev, packet[0]);
648
649 input_mt_report_pointer_emulation(dev, true);
650 input_sync(dev);
651}
652
653static void process_packet_status_v4(struct psmouse *psmouse)
654{
655 struct input_dev *dev = psmouse->dev;
656 unsigned char *packet = psmouse->packet;
657 unsigned fingers;
658 int i;
659
660 /* notify finger state change */
661 fingers = packet[1] & 0x1f;
662 for (i = 0; i < ETP_MAX_FINGERS; i++) {
663 if ((fingers & (1 << i)) == 0) {
664 input_mt_slot(dev, i);
665 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
666 }
667 }
668
669 elantech_input_sync_v4(psmouse);
670}
671
672static void process_packet_head_v4(struct psmouse *psmouse)
673{
674 struct input_dev *dev = psmouse->dev;
675 struct elantech_data *etd = psmouse->private;
676 unsigned char *packet = psmouse->packet;
677 int id;
678 int pres, traces;
679
680 id = ((packet[3] & 0xe0) >> 5) - 1;
681 if (id < 0 || id >= ETP_MAX_FINGERS)
682 return;
683
684 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
685 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
686 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
687 traces = (packet[0] & 0xf0) >> 4;
688
689 input_mt_slot(dev, id);
690 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
691
692 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
693 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
694 input_report_abs(dev, ABS_MT_PRESSURE, pres);
695 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
696 /* report this for backwards compatibility */
697 input_report_abs(dev, ABS_TOOL_WIDTH, traces);
698
699 elantech_input_sync_v4(psmouse);
700}
701
702static void process_packet_motion_v4(struct psmouse *psmouse)
703{
704 struct input_dev *dev = psmouse->dev;
705 struct elantech_data *etd = psmouse->private;
706 unsigned char *packet = psmouse->packet;
707 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
708 int id, sid;
709
710 id = ((packet[0] & 0xe0) >> 5) - 1;
711 if (id < 0 || id >= ETP_MAX_FINGERS)
712 return;
713
714 sid = ((packet[3] & 0xe0) >> 5) - 1;
715 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
716 /*
717 * Motion packets give us the delta of x, y values of specific fingers,
718 * but in two's complement. Let the compiler do the conversion for us.
719 * Also _enlarge_ the numbers to int, in case of overflow.
720 */
721 delta_x1 = (signed char)packet[1];
722 delta_y1 = (signed char)packet[2];
723 delta_x2 = (signed char)packet[4];
724 delta_y2 = (signed char)packet[5];
725
726 etd->mt[id].x += delta_x1 * weight;
727 etd->mt[id].y -= delta_y1 * weight;
728 input_mt_slot(dev, id);
729 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
730 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
731
732 if (sid >= 0 && sid < ETP_MAX_FINGERS) {
733 etd->mt[sid].x += delta_x2 * weight;
734 etd->mt[sid].y -= delta_y2 * weight;
735 input_mt_slot(dev, sid);
736 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
737 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
738 }
739
740 elantech_input_sync_v4(psmouse);
741}
742
743static void elantech_report_absolute_v4(struct psmouse *psmouse,
744 int packet_type)
745{
746 switch (packet_type) {
747 case PACKET_V4_STATUS:
748 process_packet_status_v4(psmouse);
749 break;
750
751 case PACKET_V4_HEAD:
752 process_packet_head_v4(psmouse);
753 break;
754
755 case PACKET_V4_MOTION:
756 process_packet_motion_v4(psmouse);
757 break;
758
759 case PACKET_UNKNOWN:
760 default:
761 /* impossible to get here */
762 break;
763 }
764}
765
766static int elantech_packet_check_v1(struct psmouse *psmouse)
767{
768 struct elantech_data *etd = psmouse->private;
769 unsigned char *packet = psmouse->packet;
770 unsigned char p1, p2, p3;
771
772 /* Parity bits are placed differently */
773 if (etd->info.fw_version < 0x020000) {
774 /* byte 0: D U p1 p2 1 p3 R L */
775 p1 = (packet[0] & 0x20) >> 5;
776 p2 = (packet[0] & 0x10) >> 4;
777 } else {
778 /* byte 0: n1 n0 p2 p1 1 p3 R L */
779 p1 = (packet[0] & 0x10) >> 4;
780 p2 = (packet[0] & 0x20) >> 5;
781 }
782
783 p3 = (packet[0] & 0x04) >> 2;
784
785 return etd->parity[packet[1]] == p1 &&
786 etd->parity[packet[2]] == p2 &&
787 etd->parity[packet[3]] == p3;
788}
789
790static int elantech_debounce_check_v2(struct psmouse *psmouse)
791{
792 /*
793 * When we encounter packet that matches this exactly, it means the
794 * hardware is in debounce status. Just ignore the whole packet.
795 */
796 static const u8 debounce_packet[] = {
797 0x84, 0xff, 0xff, 0x02, 0xff, 0xff
798 };
799 unsigned char *packet = psmouse->packet;
800
801 return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
802}
803
804static int elantech_packet_check_v2(struct psmouse *psmouse)
805{
806 struct elantech_data *etd = psmouse->private;
807 unsigned char *packet = psmouse->packet;
808
809 /*
810 * V2 hardware has two flavors. Older ones that do not report pressure,
811 * and newer ones that reports pressure and width. With newer ones, all
812 * packets (1, 2, 3 finger touch) have the same constant bits. With
813 * older ones, 1/3 finger touch packets and 2 finger touch packets
814 * have different constant bits.
815 * With all three cases, if the constant bits are not exactly what I
816 * expected, I consider them invalid.
817 */
818 if (etd->info.reports_pressure)
819 return (packet[0] & 0x0c) == 0x04 &&
820 (packet[3] & 0x0f) == 0x02;
821
822 if ((packet[0] & 0xc0) == 0x80)
823 return (packet[0] & 0x0c) == 0x0c &&
824 (packet[3] & 0x0e) == 0x08;
825
826 return (packet[0] & 0x3c) == 0x3c &&
827 (packet[1] & 0xf0) == 0x00 &&
828 (packet[3] & 0x3e) == 0x38 &&
829 (packet[4] & 0xf0) == 0x00;
830}
831
832/*
833 * We check the constant bits to determine what packet type we get,
834 * so packet checking is mandatory for v3 and later hardware.
835 */
836static int elantech_packet_check_v3(struct psmouse *psmouse)
837{
838 struct elantech_data *etd = psmouse->private;
839 static const u8 debounce_packet[] = {
840 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff
841 };
842 unsigned char *packet = psmouse->packet;
843
844 /*
845 * check debounce first, it has the same signature in byte 0
846 * and byte 3 as PACKET_V3_HEAD.
847 */
848 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
849 return PACKET_DEBOUNCE;
850
851 /*
852 * If the hardware flag 'crc_enabled' is set the packets have
853 * different signatures.
854 */
855 if (etd->info.crc_enabled) {
856 if ((packet[3] & 0x09) == 0x08)
857 return PACKET_V3_HEAD;
858
859 if ((packet[3] & 0x09) == 0x09)
860 return PACKET_V3_TAIL;
861 } else {
862 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
863 return PACKET_V3_HEAD;
864
865 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
866 return PACKET_V3_TAIL;
867 if ((packet[3] & 0x0f) == 0x06)
868 return PACKET_TRACKPOINT;
869 }
870
871 return PACKET_UNKNOWN;
872}
873
874static int elantech_packet_check_v4(struct psmouse *psmouse)
875{
876 struct elantech_data *etd = psmouse->private;
877 unsigned char *packet = psmouse->packet;
878 unsigned char packet_type = packet[3] & 0x03;
879 unsigned int ic_version;
880 bool sanity_check;
881
882 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
883 return PACKET_TRACKPOINT;
884
885 /* This represents the version of IC body. */
886 ic_version = (etd->info.fw_version & 0x0f0000) >> 16;
887
888 /*
889 * Sanity check based on the constant bits of a packet.
890 * The constant bits change depending on the value of
891 * the hardware flag 'crc_enabled' and the version of
892 * the IC body, but are the same for every packet,
893 * regardless of the type.
894 */
895 if (etd->info.crc_enabled)
896 sanity_check = ((packet[3] & 0x08) == 0x00);
897 else if (ic_version == 7 && etd->info.samples[1] == 0x2A)
898 sanity_check = ((packet[3] & 0x1c) == 0x10);
899 else
900 sanity_check = ((packet[0] & 0x08) == 0x00 &&
901 (packet[3] & 0x1c) == 0x10);
902
903 if (!sanity_check)
904 return PACKET_UNKNOWN;
905
906 switch (packet_type) {
907 case 0:
908 return PACKET_V4_STATUS;
909
910 case 1:
911 return PACKET_V4_HEAD;
912
913 case 2:
914 return PACKET_V4_MOTION;
915 }
916
917 return PACKET_UNKNOWN;
918}
919
920/*
921 * Process byte stream from mouse and handle complete packets
922 */
923static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
924{
925 struct elantech_data *etd = psmouse->private;
926 int packet_type;
927
928 if (psmouse->pktcnt < psmouse->pktsize)
929 return PSMOUSE_GOOD_DATA;
930
931 if (etd->info.debug > 1)
932 elantech_packet_dump(psmouse);
933
934 switch (etd->info.hw_version) {
935 case 1:
936 if (etd->info.paritycheck && !elantech_packet_check_v1(psmouse))
937 return PSMOUSE_BAD_DATA;
938
939 elantech_report_absolute_v1(psmouse);
940 break;
941
942 case 2:
943 /* ignore debounce */
944 if (elantech_debounce_check_v2(psmouse))
945 return PSMOUSE_FULL_PACKET;
946
947 if (etd->info.paritycheck && !elantech_packet_check_v2(psmouse))
948 return PSMOUSE_BAD_DATA;
949
950 elantech_report_absolute_v2(psmouse);
951 break;
952
953 case 3:
954 packet_type = elantech_packet_check_v3(psmouse);
955 switch (packet_type) {
956 case PACKET_UNKNOWN:
957 return PSMOUSE_BAD_DATA;
958
959 case PACKET_DEBOUNCE:
960 /* ignore debounce */
961 break;
962
963 case PACKET_TRACKPOINT:
964 elantech_report_trackpoint(psmouse, packet_type);
965 break;
966
967 default:
968 elantech_report_absolute_v3(psmouse, packet_type);
969 break;
970 }
971
972 break;
973
974 case 4:
975 packet_type = elantech_packet_check_v4(psmouse);
976 switch (packet_type) {
977 case PACKET_UNKNOWN:
978 return PSMOUSE_BAD_DATA;
979
980 case PACKET_TRACKPOINT:
981 elantech_report_trackpoint(psmouse, packet_type);
982 break;
983
984 default:
985 elantech_report_absolute_v4(psmouse, packet_type);
986 break;
987 }
988
989 break;
990 }
991
992 return PSMOUSE_FULL_PACKET;
993}
994
995/*
996 * This writes the reg_07 value again to the hardware at the end of every
997 * set_rate call because the register loses its value. reg_07 allows setting
998 * absolute mode on v4 hardware
999 */
1000static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse,
1001 unsigned int rate)
1002{
1003 struct elantech_data *etd = psmouse->private;
1004
1005 etd->original_set_rate(psmouse, rate);
1006 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
1007 psmouse_err(psmouse, "restoring reg_07 failed\n");
1008}
1009
1010/*
1011 * Put the touchpad into absolute mode
1012 */
1013static int elantech_set_absolute_mode(struct psmouse *psmouse)
1014{
1015 struct elantech_data *etd = psmouse->private;
1016 unsigned char val;
1017 int tries = ETP_READ_BACK_TRIES;
1018 int rc = 0;
1019
1020 switch (etd->info.hw_version) {
1021 case 1:
1022 etd->reg_10 = 0x16;
1023 etd->reg_11 = 0x8f;
1024 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
1025 elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
1026 rc = -1;
1027 }
1028 break;
1029
1030 case 2:
1031 /* Windows driver values */
1032 etd->reg_10 = 0x54;
1033 etd->reg_11 = 0x88; /* 0x8a */
1034 etd->reg_21 = 0x60; /* 0x00 */
1035 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
1036 elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
1037 elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
1038 rc = -1;
1039 }
1040 break;
1041
1042 case 3:
1043 if (etd->info.set_hw_resolution)
1044 etd->reg_10 = 0x0b;
1045 else
1046 etd->reg_10 = 0x01;
1047
1048 if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
1049 rc = -1;
1050
1051 break;
1052
1053 case 4:
1054 etd->reg_07 = 0x01;
1055 if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
1056 rc = -1;
1057
1058 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
1059 }
1060
1061 if (rc == 0) {
1062 /*
1063 * Read back reg 0x10. For hardware version 1 we must make
1064 * sure the absolute mode bit is set. For hardware version 2
1065 * the touchpad is probably initializing and not ready until
1066 * we read back the value we just wrote.
1067 */
1068 do {
1069 rc = elantech_read_reg(psmouse, 0x10, &val);
1070 if (rc == 0)
1071 break;
1072 tries--;
1073 elantech_debug("retrying read (%d).\n", tries);
1074 msleep(ETP_READ_BACK_DELAY);
1075 } while (tries > 0);
1076
1077 if (rc) {
1078 psmouse_err(psmouse,
1079 "failed to read back register 0x10.\n");
1080 } else if (etd->info.hw_version == 1 &&
1081 !(val & ETP_R10_ABSOLUTE_MODE)) {
1082 psmouse_err(psmouse,
1083 "touchpad refuses to switch to absolute mode.\n");
1084 rc = -1;
1085 }
1086 }
1087
1088 skip_readback_reg_10:
1089 if (rc)
1090 psmouse_err(psmouse, "failed to initialise registers.\n");
1091
1092 return rc;
1093}
1094
1095/*
1096 * (value from firmware) * 10 + 790 = dpi
1097 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
1098 */
1099static unsigned int elantech_convert_res(unsigned int val)
1100{
1101 return (val * 10 + 790) * 10 / 254;
1102}
1103
1104static int elantech_get_resolution_v4(struct psmouse *psmouse,
1105 unsigned int *x_res,
1106 unsigned int *y_res,
1107 unsigned int *bus)
1108{
1109 unsigned char param[3];
1110
1111 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
1112 return -1;
1113
1114 *x_res = elantech_convert_res(param[1] & 0x0f);
1115 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
1116 *bus = param[2];
1117
1118 return 0;
1119}
1120
1121static void elantech_set_buttonpad_prop(struct psmouse *psmouse)
1122{
1123 struct input_dev *dev = psmouse->dev;
1124 struct elantech_data *etd = psmouse->private;
1125
1126 if (elantech_is_buttonpad(&etd->info)) {
1127 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1128 __clear_bit(BTN_RIGHT, dev->keybit);
1129 }
1130}
1131
1132/*
1133 * Some hw_version 4 models do have a middle button
1134 */
1135static const struct dmi_system_id elantech_dmi_has_middle_button[] = {
1136#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1137 {
1138 /* Fujitsu H730 has a middle button */
1139 .matches = {
1140 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1141 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1142 },
1143 },
1144 {
1145 /* Fujitsu H760 also has a middle button */
1146 .matches = {
1147 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1148 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1149 },
1150 },
1151 {
1152 /* Fujitsu H780 also has a middle button */
1153 .matches = {
1154 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1155 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H780"),
1156 },
1157 },
1158#endif
1159 { }
1160};
1161
1162/*
1163 * Set the appropriate event bits for the input subsystem
1164 */
1165static int elantech_set_input_params(struct psmouse *psmouse)
1166{
1167 struct input_dev *dev = psmouse->dev;
1168 struct elantech_data *etd = psmouse->private;
1169 struct elantech_device_info *info = &etd->info;
1170 unsigned int x_min = info->x_min, y_min = info->y_min,
1171 x_max = info->x_max, y_max = info->y_max,
1172 width = info->width;
1173
1174 __set_bit(INPUT_PROP_POINTER, dev->propbit);
1175 __set_bit(EV_KEY, dev->evbit);
1176 __set_bit(EV_ABS, dev->evbit);
1177 __clear_bit(EV_REL, dev->evbit);
1178
1179 __set_bit(BTN_LEFT, dev->keybit);
1180 if (info->has_middle_button)
1181 __set_bit(BTN_MIDDLE, dev->keybit);
1182 __set_bit(BTN_RIGHT, dev->keybit);
1183
1184 __set_bit(BTN_TOUCH, dev->keybit);
1185 __set_bit(BTN_TOOL_FINGER, dev->keybit);
1186 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1187 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1188
1189 switch (info->hw_version) {
1190 case 1:
1191 /* Rocker button */
1192 if (info->fw_version < 0x020000 &&
1193 (info->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
1194 __set_bit(BTN_FORWARD, dev->keybit);
1195 __set_bit(BTN_BACK, dev->keybit);
1196 }
1197 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1198 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1199 break;
1200
1201 case 2:
1202 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1203 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1204 fallthrough;
1205 case 3:
1206 if (info->hw_version == 3)
1207 elantech_set_buttonpad_prop(psmouse);
1208 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1209 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1210 if (info->reports_pressure) {
1211 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1212 ETP_PMAX_V2, 0, 0);
1213 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1214 ETP_WMAX_V2, 0, 0);
1215 }
1216 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT);
1217 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1218 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1219 break;
1220
1221 case 4:
1222 elantech_set_buttonpad_prop(psmouse);
1223 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1224 /* For X to recognize me as touchpad. */
1225 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1226 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1227 /*
1228 * range of pressure and width is the same as v2,
1229 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1230 */
1231 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1232 ETP_PMAX_V2, 0, 0);
1233 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1234 ETP_WMAX_V2, 0, 0);
1235 /* Multitouch capable pad, up to 5 fingers. */
1236 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1237 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1238 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1239 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1240 ETP_PMAX_V2, 0, 0);
1241 /*
1242 * The firmware reports how many trace lines the finger spans,
1243 * convert to surface unit as Protocol-B requires.
1244 */
1245 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1246 ETP_WMAX_V2 * width, 0, 0);
1247 break;
1248 }
1249
1250 input_abs_set_res(dev, ABS_X, info->x_res);
1251 input_abs_set_res(dev, ABS_Y, info->y_res);
1252 if (info->hw_version > 1) {
1253 input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res);
1254 input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res);
1255 }
1256
1257 etd->y_max = y_max;
1258 etd->width = width;
1259
1260 return 0;
1261}
1262
1263struct elantech_attr_data {
1264 size_t field_offset;
1265 unsigned char reg;
1266};
1267
1268/*
1269 * Display a register value by reading a sysfs entry
1270 */
1271static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1272 char *buf)
1273{
1274 struct elantech_data *etd = psmouse->private;
1275 struct elantech_attr_data *attr = data;
1276 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1277 int rc = 0;
1278
1279 if (attr->reg)
1280 rc = elantech_read_reg(psmouse, attr->reg, reg);
1281
1282 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1283}
1284
1285/*
1286 * Write a register value by writing a sysfs entry
1287 */
1288static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1289 void *data, const char *buf, size_t count)
1290{
1291 struct elantech_data *etd = psmouse->private;
1292 struct elantech_attr_data *attr = data;
1293 unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1294 unsigned char value;
1295 int err;
1296
1297 err = kstrtou8(buf, 16, &value);
1298 if (err)
1299 return err;
1300
1301 /* Do we need to preserve some bits for version 2 hardware too? */
1302 if (etd->info.hw_version == 1) {
1303 if (attr->reg == 0x10)
1304 /* Force absolute mode always on */
1305 value |= ETP_R10_ABSOLUTE_MODE;
1306 else if (attr->reg == 0x11)
1307 /* Force 4 byte mode always on */
1308 value |= ETP_R11_4_BYTE_MODE;
1309 }
1310
1311 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1312 *reg = value;
1313
1314 return count;
1315}
1316
1317#define ELANTECH_INT_ATTR(_name, _register) \
1318 static struct elantech_attr_data elantech_attr_##_name = { \
1319 .field_offset = offsetof(struct elantech_data, _name), \
1320 .reg = _register, \
1321 }; \
1322 PSMOUSE_DEFINE_ATTR(_name, 0644, \
1323 &elantech_attr_##_name, \
1324 elantech_show_int_attr, \
1325 elantech_set_int_attr)
1326
1327#define ELANTECH_INFO_ATTR(_name) \
1328 static struct elantech_attr_data elantech_attr_##_name = { \
1329 .field_offset = offsetof(struct elantech_data, info) + \
1330 offsetof(struct elantech_device_info, _name), \
1331 .reg = 0, \
1332 }; \
1333 PSMOUSE_DEFINE_ATTR(_name, 0644, \
1334 &elantech_attr_##_name, \
1335 elantech_show_int_attr, \
1336 elantech_set_int_attr)
1337
1338ELANTECH_INT_ATTR(reg_07, 0x07);
1339ELANTECH_INT_ATTR(reg_10, 0x10);
1340ELANTECH_INT_ATTR(reg_11, 0x11);
1341ELANTECH_INT_ATTR(reg_20, 0x20);
1342ELANTECH_INT_ATTR(reg_21, 0x21);
1343ELANTECH_INT_ATTR(reg_22, 0x22);
1344ELANTECH_INT_ATTR(reg_23, 0x23);
1345ELANTECH_INT_ATTR(reg_24, 0x24);
1346ELANTECH_INT_ATTR(reg_25, 0x25);
1347ELANTECH_INT_ATTR(reg_26, 0x26);
1348ELANTECH_INFO_ATTR(debug);
1349ELANTECH_INFO_ATTR(paritycheck);
1350ELANTECH_INFO_ATTR(crc_enabled);
1351
1352static struct attribute *elantech_attrs[] = {
1353 &psmouse_attr_reg_07.dattr.attr,
1354 &psmouse_attr_reg_10.dattr.attr,
1355 &psmouse_attr_reg_11.dattr.attr,
1356 &psmouse_attr_reg_20.dattr.attr,
1357 &psmouse_attr_reg_21.dattr.attr,
1358 &psmouse_attr_reg_22.dattr.attr,
1359 &psmouse_attr_reg_23.dattr.attr,
1360 &psmouse_attr_reg_24.dattr.attr,
1361 &psmouse_attr_reg_25.dattr.attr,
1362 &psmouse_attr_reg_26.dattr.attr,
1363 &psmouse_attr_debug.dattr.attr,
1364 &psmouse_attr_paritycheck.dattr.attr,
1365 &psmouse_attr_crc_enabled.dattr.attr,
1366 NULL
1367};
1368
1369static const struct attribute_group elantech_attr_group = {
1370 .attrs = elantech_attrs,
1371};
1372
1373static bool elantech_is_signature_valid(const unsigned char *param)
1374{
1375 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1376 int i;
1377
1378 if (param[0] == 0)
1379 return false;
1380
1381 if (param[1] == 0)
1382 return true;
1383
1384 /*
1385 * Some hw_version >= 4 models have a revision higher then 20. Meaning
1386 * that param[2] may be 10 or 20, skip the rates check for these.
1387 */
1388 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f &&
1389 param[2] < 40)
1390 return true;
1391
1392 for (i = 0; i < ARRAY_SIZE(rates); i++)
1393 if (param[2] == rates[i])
1394 return false;
1395
1396 return true;
1397}
1398
1399/*
1400 * Use magic knock to detect Elantech touchpad
1401 */
1402int elantech_detect(struct psmouse *psmouse, bool set_properties)
1403{
1404 struct ps2dev *ps2dev = &psmouse->ps2dev;
1405 unsigned char param[3];
1406
1407 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1408
1409 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1410 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1411 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1412 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1413 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1414 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1415 return -1;
1416 }
1417
1418 /*
1419 * Report this in case there are Elantech models that use a different
1420 * set of magic numbers
1421 */
1422 if (param[0] != 0x3c || param[1] != 0x03 ||
1423 (param[2] != 0xc8 && param[2] != 0x00)) {
1424 psmouse_dbg(psmouse,
1425 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1426 param[0], param[1], param[2]);
1427 return -1;
1428 }
1429
1430 /*
1431 * Query touchpad's firmware version and see if it reports known
1432 * value to avoid mis-detection. Logitech mice are known to respond
1433 * to Elantech magic knock and there might be more.
1434 */
1435 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1436 psmouse_dbg(psmouse, "failed to query firmware version.\n");
1437 return -1;
1438 }
1439
1440 psmouse_dbg(psmouse,
1441 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1442 param[0], param[1], param[2]);
1443
1444 if (!elantech_is_signature_valid(param)) {
1445 psmouse_dbg(psmouse,
1446 "Probably not a real Elantech touchpad. Aborting.\n");
1447 return -1;
1448 }
1449
1450 if (set_properties) {
1451 psmouse->vendor = "Elantech";
1452 psmouse->name = "Touchpad";
1453 }
1454
1455 return 0;
1456}
1457
1458/*
1459 * Clean up sysfs entries when disconnecting
1460 */
1461static void elantech_disconnect(struct psmouse *psmouse)
1462{
1463 struct elantech_data *etd = psmouse->private;
1464
1465 /*
1466 * We might have left a breadcrumb when trying to
1467 * set up SMbus companion.
1468 */
1469 psmouse_smbus_cleanup(psmouse);
1470
1471 if (etd->tp_dev)
1472 input_unregister_device(etd->tp_dev);
1473 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1474 &elantech_attr_group);
1475 kfree(psmouse->private);
1476 psmouse->private = NULL;
1477}
1478
1479/*
1480 * Some hw_version 4 models fail to properly activate absolute mode on
1481 * resume without going through disable/enable cycle.
1482 */
1483static const struct dmi_system_id elantech_needs_reenable[] = {
1484#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1485 {
1486 /* Lenovo N24 */
1487 .matches = {
1488 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1489 DMI_MATCH(DMI_PRODUCT_NAME, "81AF"),
1490 },
1491 },
1492#endif
1493 { }
1494};
1495
1496/*
1497 * Put the touchpad back into absolute mode when reconnecting
1498 */
1499static int elantech_reconnect(struct psmouse *psmouse)
1500{
1501 int err;
1502
1503 psmouse_reset(psmouse);
1504
1505 if (elantech_detect(psmouse, 0))
1506 return -1;
1507
1508 if (dmi_check_system(elantech_needs_reenable)) {
1509 err = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
1510 if (err)
1511 psmouse_warn(psmouse, "failed to deactivate mouse on %s: %d\n",
1512 psmouse->ps2dev.serio->phys, err);
1513
1514 err = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1515 if (err)
1516 psmouse_warn(psmouse, "failed to reactivate mouse on %s: %d\n",
1517 psmouse->ps2dev.serio->phys, err);
1518 }
1519
1520 if (elantech_set_absolute_mode(psmouse)) {
1521 psmouse_err(psmouse,
1522 "failed to put touchpad back into absolute mode.\n");
1523 return -1;
1524 }
1525
1526 return 0;
1527}
1528
1529/*
1530 * Some hw_version 4 models do not work with crc_disabled
1531 */
1532static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
1533#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1534 {
1535 /* Fujitsu H730 does not work with crc_enabled == 0 */
1536 .matches = {
1537 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1538 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1539 },
1540 },
1541 {
1542 /* Fujitsu H760 does not work with crc_enabled == 0 */
1543 .matches = {
1544 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1545 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
1546 },
1547 },
1548 {
1549 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */
1550 .matches = {
1551 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1552 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
1553 },
1554 },
1555 {
1556 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */
1557 .matches = {
1558 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1559 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"),
1560 },
1561 },
1562 {
1563 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */
1564 .matches = {
1565 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1566 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"),
1567 },
1568 },
1569 {
1570 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */
1571 .matches = {
1572 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1573 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"),
1574 },
1575 },
1576 {
1577 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */
1578 .matches = {
1579 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1580 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"),
1581 },
1582 },
1583 {
1584 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */
1585 .matches = {
1586 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1587 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"),
1588 },
1589 },
1590 {
1591 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
1592 .matches = {
1593 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1594 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
1595 },
1596 },
1597#endif
1598 { }
1599};
1600
1601/*
1602 * Some hw_version 3 models go into error state when we try to set
1603 * bit 3 and/or bit 1 of r10.
1604 */
1605static const struct dmi_system_id no_hw_res_dmi_table[] = {
1606#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1607 {
1608 /* Gigabyte U2442 */
1609 .matches = {
1610 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1611 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1612 },
1613 },
1614#endif
1615 { }
1616};
1617
1618/*
1619 * Change Report id 0x5E to 0x5F.
1620 */
1621static int elantech_change_report_id(struct psmouse *psmouse)
1622{
1623 /*
1624 * NOTE: the code is expecting to receive param[] as an array of 3
1625 * items (see __ps2_command()), even if in this case only 2 are
1626 * actually needed. Make sure the array size is 3 to avoid potential
1627 * stack out-of-bound accesses.
1628 */
1629 unsigned char param[3] = { 0x10, 0x03 };
1630
1631 if (elantech_write_reg_params(psmouse, 0x7, param) ||
1632 elantech_read_reg_params(psmouse, 0x7, param) ||
1633 param[0] != 0x10 || param[1] != 0x03) {
1634 psmouse_err(psmouse, "Unable to change report ID to 0x5f.\n");
1635 return -EIO;
1636 }
1637
1638 return 0;
1639}
1640/*
1641 * determine hardware version and set some properties according to it.
1642 */
1643static int elantech_set_properties(struct elantech_device_info *info)
1644{
1645 /* This represents the version of IC body. */
1646 info->ic_version = (info->fw_version & 0x0f0000) >> 16;
1647
1648 /* Early version of Elan touchpads doesn't obey the rule. */
1649 if (info->fw_version < 0x020030 || info->fw_version == 0x020600)
1650 info->hw_version = 1;
1651 else {
1652 switch (info->ic_version) {
1653 case 2:
1654 case 4:
1655 info->hw_version = 2;
1656 break;
1657 case 5:
1658 info->hw_version = 3;
1659 break;
1660 case 6 ... 15:
1661 info->hw_version = 4;
1662 break;
1663 default:
1664 return -1;
1665 }
1666 }
1667
1668 /* Get information pattern for hw_version 4 */
1669 info->pattern = 0x00;
1670 if (info->ic_version == 0x0f && (info->fw_version & 0xff) <= 0x02)
1671 info->pattern = info->fw_version & 0xff;
1672
1673 /* decide which send_cmd we're gonna use early */
1674 info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd :
1675 synaptics_send_cmd;
1676
1677 /* Turn on packet checking by default */
1678 info->paritycheck = 1;
1679
1680 /*
1681 * This firmware suffers from misreporting coordinates when
1682 * a touch action starts causing the mouse cursor or scrolled page
1683 * to jump. Enable a workaround.
1684 */
1685 info->jumpy_cursor =
1686 (info->fw_version == 0x020022 || info->fw_version == 0x020600);
1687
1688 if (info->hw_version > 1) {
1689 /* For now show extra debug information */
1690 info->debug = 1;
1691
1692 if (info->fw_version >= 0x020800)
1693 info->reports_pressure = true;
1694 }
1695
1696 /*
1697 * The signatures of v3 and v4 packets change depending on the
1698 * value of this hardware flag.
1699 */
1700 info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 ||
1701 dmi_check_system(elantech_dmi_force_crc_enabled);
1702
1703 /* Enable real hardware resolution on hw_version 3 ? */
1704 info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1705
1706 return 0;
1707}
1708
1709static int elantech_query_info(struct psmouse *psmouse,
1710 struct elantech_device_info *info)
1711{
1712 unsigned char param[3];
1713 unsigned char traces;
1714 unsigned char ic_body[3];
1715
1716 memset(info, 0, sizeof(*info));
1717
1718 /*
1719 * Do the version query again so we can store the result
1720 */
1721 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1722 psmouse_err(psmouse, "failed to query firmware version.\n");
1723 return -EINVAL;
1724 }
1725 info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1726
1727 if (elantech_set_properties(info)) {
1728 psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1729 return -EINVAL;
1730 }
1731 psmouse_info(psmouse,
1732 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1733 info->hw_version, param[0], param[1], param[2]);
1734
1735 if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1736 info->capabilities)) {
1737 psmouse_err(psmouse, "failed to query capabilities.\n");
1738 return -EINVAL;
1739 }
1740 psmouse_info(psmouse,
1741 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1742 info->capabilities[0], info->capabilities[1],
1743 info->capabilities[2]);
1744
1745 if (info->hw_version != 1) {
1746 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) {
1747 psmouse_err(psmouse, "failed to query sample data\n");
1748 return -EINVAL;
1749 }
1750 psmouse_info(psmouse,
1751 "Elan sample query result %02x, %02x, %02x\n",
1752 info->samples[0],
1753 info->samples[1],
1754 info->samples[2]);
1755 }
1756
1757 if (info->pattern > 0x00 && info->ic_version == 0xf) {
1758 if (info->send_cmd(psmouse, ETP_ICBODY_QUERY, ic_body)) {
1759 psmouse_err(psmouse, "failed to query ic body\n");
1760 return -EINVAL;
1761 }
1762 info->ic_version = be16_to_cpup((__be16 *)ic_body);
1763 psmouse_info(psmouse,
1764 "Elan ic body: %#04x, current fw version: %#02x\n",
1765 info->ic_version, ic_body[2]);
1766 }
1767
1768 info->product_id = be16_to_cpup((__be16 *)info->samples);
1769 if (info->pattern == 0x00)
1770 info->product_id &= 0xff;
1771
1772 if (info->samples[1] == 0x74 && info->hw_version == 0x03) {
1773 /*
1774 * This module has a bug which makes absolute mode
1775 * unusable, so let's abort so we'll be using standard
1776 * PS/2 protocol.
1777 */
1778 psmouse_info(psmouse,
1779 "absolute mode broken, forcing standard PS/2 protocol\n");
1780 return -ENODEV;
1781 }
1782
1783 /* The MSB indicates the presence of the trackpoint */
1784 info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80;
1785
1786 if (info->has_trackpoint && info->ic_version == 0x0011 &&
1787 (info->product_id == 0x08 || info->product_id == 0x09 ||
1788 info->product_id == 0x0d || info->product_id == 0x0e)) {
1789 /*
1790 * This module has a bug which makes trackpoint in SMBus
1791 * mode return invalid data unless trackpoint is switched
1792 * from using 0x5e reports to 0x5f. If we are not able to
1793 * make the switch, let's abort initialization so we'll be
1794 * using standard PS/2 protocol.
1795 */
1796 if (elantech_change_report_id(psmouse)) {
1797 psmouse_info(psmouse,
1798 "Trackpoint report is broken, forcing standard PS/2 protocol\n");
1799 return -ENODEV;
1800 }
1801 }
1802
1803 info->x_res = 31;
1804 info->y_res = 31;
1805 if (info->hw_version == 4) {
1806 if (elantech_get_resolution_v4(psmouse,
1807 &info->x_res,
1808 &info->y_res,
1809 &info->bus)) {
1810 psmouse_warn(psmouse,
1811 "failed to query resolution data.\n");
1812 }
1813 }
1814
1815 /* query range information */
1816 switch (info->hw_version) {
1817 case 1:
1818 info->x_min = ETP_XMIN_V1;
1819 info->y_min = ETP_YMIN_V1;
1820 info->x_max = ETP_XMAX_V1;
1821 info->y_max = ETP_YMAX_V1;
1822 break;
1823
1824 case 2:
1825 if (info->fw_version == 0x020800 ||
1826 info->fw_version == 0x020b00 ||
1827 info->fw_version == 0x020030) {
1828 info->x_min = ETP_XMIN_V2;
1829 info->y_min = ETP_YMIN_V2;
1830 info->x_max = ETP_XMAX_V2;
1831 info->y_max = ETP_YMAX_V2;
1832 } else {
1833 int i;
1834 int fixed_dpi;
1835
1836 i = (info->fw_version > 0x020800 &&
1837 info->fw_version < 0x020900) ? 1 : 2;
1838
1839 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1840 return -EINVAL;
1841
1842 fixed_dpi = param[1] & 0x10;
1843
1844 if (((info->fw_version >> 16) == 0x14) && fixed_dpi) {
1845 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
1846 return -EINVAL;
1847
1848 info->x_max = (info->capabilities[1] - i) * param[1] / 2;
1849 info->y_max = (info->capabilities[2] - i) * param[2] / 2;
1850 } else if (info->fw_version == 0x040216) {
1851 info->x_max = 819;
1852 info->y_max = 405;
1853 } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) {
1854 info->x_max = 900;
1855 info->y_max = 500;
1856 } else {
1857 info->x_max = (info->capabilities[1] - i) * 64;
1858 info->y_max = (info->capabilities[2] - i) * 64;
1859 }
1860 }
1861 break;
1862
1863 case 3:
1864 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1865 return -EINVAL;
1866
1867 info->x_max = (0x0f & param[0]) << 8 | param[1];
1868 info->y_max = (0xf0 & param[0]) << 4 | param[2];
1869 break;
1870
1871 case 4:
1872 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1873 return -EINVAL;
1874
1875 info->x_max = (0x0f & param[0]) << 8 | param[1];
1876 info->y_max = (0xf0 & param[0]) << 4 | param[2];
1877 traces = info->capabilities[1];
1878 if ((traces < 2) || (traces > info->x_max))
1879 return -EINVAL;
1880
1881 info->width = info->x_max / (traces - 1);
1882
1883 /* column number of traces */
1884 info->x_traces = traces;
1885
1886 /* row number of traces */
1887 traces = info->capabilities[2];
1888 if ((traces >= 2) && (traces <= info->y_max))
1889 info->y_traces = traces;
1890
1891 break;
1892 }
1893
1894 /* check for the middle button: DMI matching or new v4 firmwares */
1895 info->has_middle_button = dmi_check_system(elantech_dmi_has_middle_button) ||
1896 (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) &&
1897 !elantech_is_buttonpad(info));
1898
1899 return 0;
1900}
1901
1902#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
1903
1904/*
1905 * The newest Elantech device can use a secondary bus (over SMBus) which
1906 * provides a better bandwidth and allow a better control of the touchpads.
1907 * This is used to decide if we need to use this bus or not.
1908 */
1909enum {
1910 ELANTECH_SMBUS_NOT_SET = -1,
1911 ELANTECH_SMBUS_OFF,
1912 ELANTECH_SMBUS_ON,
1913};
1914
1915static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ?
1916 ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF;
1917module_param_named(elantech_smbus, elantech_smbus, int, 0644);
1918MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device.");
1919
1920static const char * const i2c_blacklist_pnp_ids[] = {
1921 /*
1922 * These are known to not be working properly as bits are missing
1923 * in elan_i2c.
1924 */
1925 NULL
1926};
1927
1928static int elantech_create_smbus(struct psmouse *psmouse,
1929 struct elantech_device_info *info,
1930 bool leave_breadcrumbs)
1931{
1932 struct property_entry i2c_props[11] = {};
1933 struct i2c_board_info smbus_board = {
1934 I2C_BOARD_INFO("elan_i2c", 0x15),
1935 .flags = I2C_CLIENT_HOST_NOTIFY,
1936 };
1937 unsigned int idx = 0;
1938
1939 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-x",
1940 info->x_max + 1);
1941 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-y",
1942 info->y_max + 1);
1943 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-x",
1944 info->x_min);
1945 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-y",
1946 info->y_min);
1947 if (info->x_res)
1948 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-x-mm",
1949 (info->x_max + 1) / info->x_res);
1950 if (info->y_res)
1951 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-y-mm",
1952 (info->y_max + 1) / info->y_res);
1953
1954 if (info->has_trackpoint)
1955 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,trackpoint");
1956
1957 if (info->has_middle_button)
1958 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,middle-button");
1959
1960 if (info->x_traces)
1961 i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,x_traces",
1962 info->x_traces);
1963 if (info->y_traces)
1964 i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,y_traces",
1965 info->y_traces);
1966
1967 if (elantech_is_buttonpad(info))
1968 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,clickpad");
1969
1970 smbus_board.fwnode = fwnode_create_software_node(i2c_props, NULL);
1971 if (IS_ERR(smbus_board.fwnode))
1972 return PTR_ERR(smbus_board.fwnode);
1973
1974 return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false,
1975 leave_breadcrumbs);
1976}
1977
1978/*
1979 * elantech_setup_smbus - called once the PS/2 devices are enumerated
1980 * and decides to instantiate a SMBus InterTouch device.
1981 */
1982static int elantech_setup_smbus(struct psmouse *psmouse,
1983 struct elantech_device_info *info,
1984 bool leave_breadcrumbs)
1985{
1986 int error;
1987
1988 if (elantech_smbus == ELANTECH_SMBUS_OFF)
1989 return -ENXIO;
1990
1991 if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) {
1992 /*
1993 * New ICs are enabled by default, unless mentioned in
1994 * i2c_blacklist_pnp_ids.
1995 * Old ICs are up to the user to decide.
1996 */
1997 if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) ||
1998 psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids))
1999 return -ENXIO;
2000 }
2001
2002 psmouse_info(psmouse, "Trying to set up SMBus access\n");
2003
2004 error = elantech_create_smbus(psmouse, info, leave_breadcrumbs);
2005 if (error) {
2006 if (error == -EAGAIN)
2007 psmouse_info(psmouse, "SMbus companion is not ready yet\n");
2008 else
2009 psmouse_err(psmouse, "unable to create intertouch device\n");
2010
2011 return error;
2012 }
2013
2014 return 0;
2015}
2016
2017static bool elantech_use_host_notify(struct psmouse *psmouse,
2018 struct elantech_device_info *info)
2019{
2020 if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version))
2021 return true;
2022
2023 switch (info->bus) {
2024 case ETP_BUS_PS2_ONLY:
2025 /* expected case */
2026 break;
2027 case ETP_BUS_SMB_ALERT_ONLY:
2028 case ETP_BUS_PS2_SMB_ALERT:
2029 psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n");
2030 break;
2031 case ETP_BUS_SMB_HST_NTFY_ONLY:
2032 case ETP_BUS_PS2_SMB_HST_NTFY:
2033 return true;
2034 default:
2035 psmouse_dbg(psmouse,
2036 "Ignoring SMBus bus provider %d.\n",
2037 info->bus);
2038 }
2039
2040 return false;
2041}
2042
2043int elantech_init_smbus(struct psmouse *psmouse)
2044{
2045 struct elantech_device_info info;
2046 int error;
2047
2048 psmouse_reset(psmouse);
2049
2050 error = elantech_query_info(psmouse, &info);
2051 if (error)
2052 goto init_fail;
2053
2054 if (info.hw_version < 4) {
2055 error = -ENXIO;
2056 goto init_fail;
2057 }
2058
2059 return elantech_create_smbus(psmouse, &info, false);
2060 init_fail:
2061 psmouse_reset(psmouse);
2062 return error;
2063}
2064#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
2065
2066/*
2067 * Initialize the touchpad and create sysfs entries
2068 */
2069static int elantech_setup_ps2(struct psmouse *psmouse,
2070 struct elantech_device_info *info)
2071{
2072 struct elantech_data *etd;
2073 int i;
2074 int error = -EINVAL;
2075 struct input_dev *tp_dev;
2076
2077 psmouse->private = etd = kzalloc_obj(*etd);
2078 if (!etd)
2079 return -ENOMEM;
2080
2081 etd->info = *info;
2082
2083 etd->parity[0] = 1;
2084 for (i = 1; i < 256; i++)
2085 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
2086
2087 if (elantech_set_absolute_mode(psmouse)) {
2088 psmouse_err(psmouse,
2089 "failed to put touchpad into absolute mode.\n");
2090 goto init_fail;
2091 }
2092
2093 if (info->fw_version == 0x381f17) {
2094 etd->original_set_rate = psmouse->set_rate;
2095 psmouse->set_rate = elantech_set_rate_restore_reg_07;
2096 }
2097
2098 if (elantech_set_input_params(psmouse)) {
2099 psmouse_err(psmouse, "failed to query touchpad range.\n");
2100 goto init_fail;
2101 }
2102
2103 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
2104 &elantech_attr_group);
2105 if (error) {
2106 psmouse_err(psmouse,
2107 "failed to create sysfs attributes, error: %d.\n",
2108 error);
2109 goto init_fail;
2110 }
2111
2112 if (info->has_trackpoint) {
2113 tp_dev = input_allocate_device();
2114
2115 if (!tp_dev) {
2116 error = -ENOMEM;
2117 goto init_fail_tp_alloc;
2118 }
2119
2120 etd->tp_dev = tp_dev;
2121 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
2122 psmouse->ps2dev.serio->phys);
2123 tp_dev->phys = etd->tp_phys;
2124 tp_dev->name = "ETPS/2 Elantech TrackPoint";
2125 tp_dev->id.bustype = BUS_I8042;
2126 tp_dev->id.vendor = 0x0002;
2127 tp_dev->id.product = PSMOUSE_ELANTECH;
2128 tp_dev->id.version = 0x0000;
2129 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev;
2130 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
2131 tp_dev->relbit[BIT_WORD(REL_X)] =
2132 BIT_MASK(REL_X) | BIT_MASK(REL_Y);
2133 tp_dev->keybit[BIT_WORD(BTN_LEFT)] =
2134 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
2135 BIT_MASK(BTN_RIGHT);
2136
2137 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit);
2138 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit);
2139
2140 error = input_register_device(etd->tp_dev);
2141 if (error < 0)
2142 goto init_fail_tp_reg;
2143 }
2144
2145 psmouse->protocol_handler = elantech_process_byte;
2146 psmouse->disconnect = elantech_disconnect;
2147 psmouse->reconnect = elantech_reconnect;
2148 psmouse->fast_reconnect = NULL;
2149 psmouse->pktsize = info->hw_version > 1 ? 6 : 4;
2150
2151 return 0;
2152 init_fail_tp_reg:
2153 input_free_device(tp_dev);
2154 init_fail_tp_alloc:
2155 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
2156 &elantech_attr_group);
2157 init_fail:
2158 kfree(etd);
2159 return error;
2160}
2161
2162int elantech_init_ps2(struct psmouse *psmouse)
2163{
2164 struct elantech_device_info info;
2165 int error;
2166
2167 psmouse_reset(psmouse);
2168
2169 error = elantech_query_info(psmouse, &info);
2170 if (error)
2171 goto init_fail;
2172
2173 error = elantech_setup_ps2(psmouse, &info);
2174 if (error)
2175 goto init_fail;
2176
2177 return 0;
2178 init_fail:
2179 psmouse_reset(psmouse);
2180 return error;
2181}
2182
2183int elantech_init(struct psmouse *psmouse)
2184{
2185 struct elantech_device_info info;
2186 int error;
2187
2188 psmouse_reset(psmouse);
2189
2190 error = elantech_query_info(psmouse, &info);
2191 if (error)
2192 goto init_fail;
2193
2194#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
2195
2196 if (elantech_use_host_notify(psmouse, &info)) {
2197 if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ||
2198 !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) {
2199 psmouse_warn(psmouse,
2200 "The touchpad can support a better bus than the too old PS/2 protocol. "
2201 "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n");
2202 }
2203 error = elantech_setup_smbus(psmouse, &info, true);
2204 if (!error)
2205 return PSMOUSE_ELANTECH_SMBUS;
2206 }
2207
2208#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
2209
2210 error = elantech_setup_ps2(psmouse, &info);
2211 if (error < 0) {
2212 /*
2213 * Not using any flavor of Elantech support, so clean up
2214 * SMbus breadcrumbs, if any.
2215 */
2216 psmouse_smbus_cleanup(psmouse);
2217 goto init_fail;
2218 }
2219
2220 return PSMOUSE_ELANTECH;
2221 init_fail:
2222 psmouse_reset(psmouse);
2223 return error;
2224}