Commit | Line | Data |
---|---|---|
2a0bd75e | 1 | /* |
3f8c0df4 | 2 | * Elantech Touchpad driver (v6) |
2a0bd75e | 3 | * |
3f8c0df4 | 4 | * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net> |
2a0bd75e AO |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation. | |
9 | * | |
10 | * Trademarks are the property of their respective owners. | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
2a0bd75e AO |
15 | #include <linux/module.h> |
16 | #include <linux/input.h> | |
17 | #include <linux/serio.h> | |
18 | #include <linux/libps2.h> | |
19 | #include "psmouse.h" | |
20 | #include "elantech.h" | |
21 | ||
22 | #define elantech_debug(format, arg...) \ | |
23 | do { \ | |
24 | if (etd->debug) \ | |
25 | printk(KERN_DEBUG format, ##arg); \ | |
26 | } while (0) | |
27 | ||
f81bc788 FR |
28 | static bool force_elantech; |
29 | module_param_named(force_elantech, force_elantech, bool, 0644); | |
30 | MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default)."); | |
31 | ||
2a0bd75e AO |
32 | /* |
33 | * Send a Synaptics style sliced query command | |
34 | */ | |
35 | static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, | |
36 | unsigned char *param) | |
37 | { | |
38 | if (psmouse_sliced_command(psmouse, c) || | |
39 | ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { | |
40 | pr_err("elantech.c: synaptics_send_cmd query 0x%02x failed.\n", c); | |
41 | return -1; | |
42 | } | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
47 | /* | |
48 | * A retrying version of ps2_command | |
49 | */ | |
50 | static int elantech_ps2_command(struct psmouse *psmouse, | |
51 | unsigned char *param, int command) | |
52 | { | |
53 | struct ps2dev *ps2dev = &psmouse->ps2dev; | |
54 | struct elantech_data *etd = psmouse->private; | |
55 | int rc; | |
56 | int tries = ETP_PS2_COMMAND_TRIES; | |
57 | ||
58 | do { | |
59 | rc = ps2_command(ps2dev, param, command); | |
60 | if (rc == 0) | |
61 | break; | |
62 | tries--; | |
63 | elantech_debug("elantech.c: retrying ps2 command 0x%02x (%d).\n", | |
64 | command, tries); | |
65 | msleep(ETP_PS2_COMMAND_DELAY); | |
66 | } while (tries > 0); | |
67 | ||
68 | if (rc) | |
69 | pr_err("elantech.c: ps2 command 0x%02x failed.\n", command); | |
70 | ||
71 | return rc; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Send an Elantech style special command to read a value from a register | |
76 | */ | |
77 | static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg, | |
78 | unsigned char *val) | |
79 | { | |
80 | struct elantech_data *etd = psmouse->private; | |
81 | unsigned char param[3]; | |
82 | int rc = 0; | |
83 | ||
84 | if (reg < 0x10 || reg > 0x26) | |
85 | return -1; | |
86 | ||
87 | if (reg > 0x11 && reg < 0x20) | |
88 | return -1; | |
89 | ||
90 | switch (etd->hw_version) { | |
91 | case 1: | |
92 | if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) || | |
93 | psmouse_sliced_command(psmouse, reg) || | |
94 | ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { | |
95 | rc = -1; | |
96 | } | |
97 | break; | |
98 | ||
99 | case 2: | |
100 | if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || | |
101 | elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) || | |
102 | elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || | |
103 | elantech_ps2_command(psmouse, NULL, reg) || | |
104 | elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { | |
105 | rc = -1; | |
106 | } | |
107 | break; | |
108 | } | |
109 | ||
110 | if (rc) | |
111 | pr_err("elantech.c: failed to read register 0x%02x.\n", reg); | |
112 | else | |
113 | *val = param[0]; | |
114 | ||
115 | return rc; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Send an Elantech style special command to write a register with a value | |
120 | */ | |
121 | static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg, | |
122 | unsigned char val) | |
123 | { | |
124 | struct elantech_data *etd = psmouse->private; | |
125 | int rc = 0; | |
126 | ||
127 | if (reg < 0x10 || reg > 0x26) | |
128 | return -1; | |
129 | ||
130 | if (reg > 0x11 && reg < 0x20) | |
131 | return -1; | |
132 | ||
133 | switch (etd->hw_version) { | |
134 | case 1: | |
135 | if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) || | |
136 | psmouse_sliced_command(psmouse, reg) || | |
137 | psmouse_sliced_command(psmouse, val) || | |
138 | ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) { | |
139 | rc = -1; | |
140 | } | |
141 | break; | |
142 | ||
143 | case 2: | |
144 | if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || | |
145 | elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) || | |
146 | elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || | |
147 | elantech_ps2_command(psmouse, NULL, reg) || | |
148 | elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || | |
149 | elantech_ps2_command(psmouse, NULL, val) || | |
150 | elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { | |
151 | rc = -1; | |
152 | } | |
153 | break; | |
154 | } | |
155 | ||
156 | if (rc) | |
157 | pr_err("elantech.c: failed to write register 0x%02x with value 0x%02x.\n", | |
158 | reg, val); | |
159 | ||
160 | return rc; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Dump a complete mouse movement packet to the syslog | |
165 | */ | |
166 | static void elantech_packet_dump(unsigned char *packet, int size) | |
167 | { | |
168 | int i; | |
169 | ||
170 | printk(KERN_DEBUG "elantech.c: PS/2 packet ["); | |
171 | for (i = 0; i < size; i++) | |
172 | printk("%s0x%02x ", (i) ? ", " : " ", packet[i]); | |
173 | printk("]\n"); | |
174 | } | |
175 | ||
176 | /* | |
177 | * Interpret complete data packets and report absolute mode input events for | |
178 | * hardware version 1. (4 byte packets) | |
179 | */ | |
180 | static void elantech_report_absolute_v1(struct psmouse *psmouse) | |
181 | { | |
182 | struct input_dev *dev = psmouse->dev; | |
183 | struct elantech_data *etd = psmouse->private; | |
184 | unsigned char *packet = psmouse->packet; | |
185 | int fingers; | |
3f8c0df4 | 186 | static int old_fingers; |
2a0bd75e | 187 | |
504e8bee | 188 | if (etd->fw_version < 0x020000) { |
e938fbfd FR |
189 | /* |
190 | * byte 0: D U p1 p2 1 p3 R L | |
191 | * byte 1: f 0 th tw x9 x8 y9 y8 | |
192 | */ | |
2a0bd75e AO |
193 | fingers = ((packet[1] & 0x80) >> 7) + |
194 | ((packet[1] & 0x30) >> 4); | |
195 | } else { | |
e938fbfd FR |
196 | /* |
197 | * byte 0: n1 n0 p2 p1 1 p3 R L | |
198 | * byte 1: 0 0 0 0 x9 x8 y9 y8 | |
199 | */ | |
2a0bd75e AO |
200 | fingers = (packet[0] & 0xc0) >> 6; |
201 | } | |
202 | ||
3f8c0df4 AO |
203 | if (etd->jumpy_cursor) { |
204 | /* Discard packets that are likely to have bogus coordinates */ | |
205 | if (fingers > old_fingers) { | |
206 | elantech_debug("elantech.c: discarding packet\n"); | |
207 | goto discard_packet_v1; | |
208 | } | |
209 | } | |
210 | ||
2a0bd75e AO |
211 | input_report_key(dev, BTN_TOUCH, fingers != 0); |
212 | ||
e938fbfd FR |
213 | /* |
214 | * byte 2: x7 x6 x5 x4 x3 x2 x1 x0 | |
215 | * byte 3: y7 y6 y5 y4 y3 y2 y1 y0 | |
216 | */ | |
2a0bd75e AO |
217 | if (fingers) { |
218 | input_report_abs(dev, ABS_X, | |
219 | ((packet[1] & 0x0c) << 6) | packet[2]); | |
e938fbfd FR |
220 | input_report_abs(dev, ABS_Y, |
221 | ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3])); | |
2a0bd75e AO |
222 | } |
223 | ||
224 | input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); | |
225 | input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); | |
226 | input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); | |
227 | input_report_key(dev, BTN_LEFT, packet[0] & 0x01); | |
228 | input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); | |
229 | ||
504e8bee | 230 | if (etd->fw_version < 0x020000 && |
2a0bd75e AO |
231 | (etd->capabilities & ETP_CAP_HAS_ROCKER)) { |
232 | /* rocker up */ | |
233 | input_report_key(dev, BTN_FORWARD, packet[0] & 0x40); | |
234 | /* rocker down */ | |
235 | input_report_key(dev, BTN_BACK, packet[0] & 0x80); | |
236 | } | |
237 | ||
238 | input_sync(dev); | |
3f8c0df4 AO |
239 | |
240 | discard_packet_v1: | |
241 | old_fingers = fingers; | |
2a0bd75e AO |
242 | } |
243 | ||
244 | /* | |
245 | * Interpret complete data packets and report absolute mode input events for | |
246 | * hardware version 2. (6 byte packets) | |
247 | */ | |
248 | static void elantech_report_absolute_v2(struct psmouse *psmouse) | |
249 | { | |
250 | struct input_dev *dev = psmouse->dev; | |
251 | unsigned char *packet = psmouse->packet; | |
252 | int fingers, x1, y1, x2, y2; | |
253 | ||
254 | /* byte 0: n1 n0 . . . . R L */ | |
255 | fingers = (packet[0] & 0xc0) >> 6; | |
256 | input_report_key(dev, BTN_TOUCH, fingers != 0); | |
257 | ||
258 | switch (fingers) { | |
259 | case 1: | |
e938fbfd FR |
260 | /* |
261 | * byte 1: . . . . . x10 x9 x8 | |
262 | * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 | |
263 | */ | |
264 | input_report_abs(dev, ABS_X, | |
265 | ((packet[1] & 0x07) << 8) | packet[2]); | |
266 | /* | |
267 | * byte 4: . . . . . . y9 y8 | |
268 | * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 | |
269 | */ | |
270 | input_report_abs(dev, ABS_Y, | |
271 | ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5])); | |
2a0bd75e AO |
272 | break; |
273 | ||
274 | case 2: | |
e938fbfd FR |
275 | /* |
276 | * The coordinate of each finger is reported separately | |
277 | * with a lower resolution for two finger touches: | |
278 | * byte 0: . . ay8 ax8 . . . . | |
279 | * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 | |
280 | */ | |
2a0bd75e AO |
281 | x1 = ((packet[0] & 0x10) << 4) | packet[1]; |
282 | /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ | |
283 | y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]); | |
e938fbfd FR |
284 | /* |
285 | * byte 3: . . by8 bx8 . . . . | |
286 | * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 | |
287 | */ | |
2a0bd75e AO |
288 | x2 = ((packet[3] & 0x10) << 4) | packet[4]; |
289 | /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */ | |
290 | y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]); | |
e938fbfd FR |
291 | /* |
292 | * For compatibility with the X Synaptics driver scale up | |
293 | * one coordinate and report as ordinary mouse movent | |
294 | */ | |
2a0bd75e AO |
295 | input_report_abs(dev, ABS_X, x1 << 2); |
296 | input_report_abs(dev, ABS_Y, y1 << 2); | |
e938fbfd FR |
297 | /* |
298 | * For compatibility with the proprietary X Elantech driver | |
299 | * report both coordinates as hat coordinates | |
300 | */ | |
2a0bd75e AO |
301 | input_report_abs(dev, ABS_HAT0X, x1); |
302 | input_report_abs(dev, ABS_HAT0Y, y1); | |
303 | input_report_abs(dev, ABS_HAT1X, x2); | |
304 | input_report_abs(dev, ABS_HAT1Y, y2); | |
305 | break; | |
306 | } | |
307 | ||
308 | input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); | |
309 | input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); | |
310 | input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); | |
311 | input_report_key(dev, BTN_LEFT, packet[0] & 0x01); | |
312 | input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); | |
313 | ||
314 | input_sync(dev); | |
315 | } | |
316 | ||
317 | static int elantech_check_parity_v1(struct psmouse *psmouse) | |
318 | { | |
319 | struct elantech_data *etd = psmouse->private; | |
320 | unsigned char *packet = psmouse->packet; | |
321 | unsigned char p1, p2, p3; | |
322 | ||
323 | /* Parity bits are placed differently */ | |
504e8bee | 324 | if (etd->fw_version < 0x020000) { |
2a0bd75e AO |
325 | /* byte 0: D U p1 p2 1 p3 R L */ |
326 | p1 = (packet[0] & 0x20) >> 5; | |
327 | p2 = (packet[0] & 0x10) >> 4; | |
328 | } else { | |
329 | /* byte 0: n1 n0 p2 p1 1 p3 R L */ | |
330 | p1 = (packet[0] & 0x10) >> 4; | |
331 | p2 = (packet[0] & 0x20) >> 5; | |
332 | } | |
333 | ||
334 | p3 = (packet[0] & 0x04) >> 2; | |
335 | ||
336 | return etd->parity[packet[1]] == p1 && | |
337 | etd->parity[packet[2]] == p2 && | |
338 | etd->parity[packet[3]] == p3; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Process byte stream from mouse and handle complete packets | |
343 | */ | |
344 | static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) | |
345 | { | |
346 | struct elantech_data *etd = psmouse->private; | |
347 | ||
348 | if (psmouse->pktcnt < psmouse->pktsize) | |
349 | return PSMOUSE_GOOD_DATA; | |
350 | ||
351 | if (etd->debug > 1) | |
352 | elantech_packet_dump(psmouse->packet, psmouse->pktsize); | |
353 | ||
354 | switch (etd->hw_version) { | |
355 | case 1: | |
356 | if (etd->paritycheck && !elantech_check_parity_v1(psmouse)) | |
357 | return PSMOUSE_BAD_DATA; | |
358 | ||
359 | elantech_report_absolute_v1(psmouse); | |
360 | break; | |
361 | ||
362 | case 2: | |
363 | /* We don't know how to check parity in protocol v2 */ | |
364 | elantech_report_absolute_v2(psmouse); | |
365 | break; | |
366 | } | |
367 | ||
368 | return PSMOUSE_FULL_PACKET; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Put the touchpad into absolute mode | |
373 | */ | |
374 | static int elantech_set_absolute_mode(struct psmouse *psmouse) | |
375 | { | |
376 | struct elantech_data *etd = psmouse->private; | |
377 | unsigned char val; | |
378 | int tries = ETP_READ_BACK_TRIES; | |
379 | int rc = 0; | |
380 | ||
381 | switch (etd->hw_version) { | |
382 | case 1: | |
383 | etd->reg_10 = 0x16; | |
384 | etd->reg_11 = 0x8f; | |
385 | if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || | |
386 | elantech_write_reg(psmouse, 0x11, etd->reg_11)) { | |
387 | rc = -1; | |
388 | } | |
389 | break; | |
390 | ||
391 | case 2: | |
392 | /* Windows driver values */ | |
393 | etd->reg_10 = 0x54; | |
394 | etd->reg_11 = 0x88; /* 0x8a */ | |
395 | etd->reg_21 = 0x60; /* 0x00 */ | |
396 | if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || | |
397 | elantech_write_reg(psmouse, 0x11, etd->reg_11) || | |
398 | elantech_write_reg(psmouse, 0x21, etd->reg_21)) { | |
399 | rc = -1; | |
400 | break; | |
401 | } | |
b2546df6 AO |
402 | } |
403 | ||
404 | if (rc == 0) { | |
2a0bd75e | 405 | /* |
b2546df6 AO |
406 | * Read back reg 0x10. For hardware version 1 we must make |
407 | * sure the absolute mode bit is set. For hardware version 2 | |
408 | * the touchpad is probably initalising and not ready until | |
409 | * we read back the value we just wrote. | |
2a0bd75e AO |
410 | */ |
411 | do { | |
412 | rc = elantech_read_reg(psmouse, 0x10, &val); | |
413 | if (rc == 0) | |
414 | break; | |
415 | tries--; | |
416 | elantech_debug("elantech.c: retrying read (%d).\n", | |
b2546df6 | 417 | tries); |
2a0bd75e AO |
418 | msleep(ETP_READ_BACK_DELAY); |
419 | } while (tries > 0); | |
b2546df6 AO |
420 | |
421 | if (rc) { | |
2a0bd75e | 422 | pr_err("elantech.c: failed to read back register 0x10.\n"); |
b2546df6 AO |
423 | } else if (etd->hw_version == 1 && |
424 | !(val & ETP_R10_ABSOLUTE_MODE)) { | |
425 | pr_err("elantech.c: touchpad refuses " | |
426 | "to switch to absolute mode.\n"); | |
427 | rc = -1; | |
428 | } | |
2a0bd75e AO |
429 | } |
430 | ||
431 | if (rc) | |
432 | pr_err("elantech.c: failed to initialise registers.\n"); | |
433 | ||
434 | return rc; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Set the appropriate event bits for the input subsystem | |
439 | */ | |
440 | static void elantech_set_input_params(struct psmouse *psmouse) | |
441 | { | |
442 | struct input_dev *dev = psmouse->dev; | |
443 | struct elantech_data *etd = psmouse->private; | |
444 | ||
445 | __set_bit(EV_KEY, dev->evbit); | |
446 | __set_bit(EV_ABS, dev->evbit); | |
c7a1f3cc | 447 | __clear_bit(EV_REL, dev->evbit); |
2a0bd75e AO |
448 | |
449 | __set_bit(BTN_LEFT, dev->keybit); | |
450 | __set_bit(BTN_RIGHT, dev->keybit); | |
451 | ||
452 | __set_bit(BTN_TOUCH, dev->keybit); | |
453 | __set_bit(BTN_TOOL_FINGER, dev->keybit); | |
454 | __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); | |
455 | __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); | |
456 | ||
457 | switch (etd->hw_version) { | |
458 | case 1: | |
459 | /* Rocker button */ | |
504e8bee | 460 | if (etd->fw_version < 0x020000 && |
2a0bd75e AO |
461 | (etd->capabilities & ETP_CAP_HAS_ROCKER)) { |
462 | __set_bit(BTN_FORWARD, dev->keybit); | |
463 | __set_bit(BTN_BACK, dev->keybit); | |
464 | } | |
465 | input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0); | |
466 | input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0); | |
467 | break; | |
468 | ||
469 | case 2: | |
470 | input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0); | |
471 | input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0); | |
472 | input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0); | |
473 | input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0); | |
474 | input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0); | |
475 | input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0); | |
476 | break; | |
477 | } | |
478 | } | |
479 | ||
480 | struct elantech_attr_data { | |
481 | size_t field_offset; | |
482 | unsigned char reg; | |
483 | }; | |
484 | ||
485 | /* | |
486 | * Display a register value by reading a sysfs entry | |
487 | */ | |
488 | static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, | |
489 | char *buf) | |
490 | { | |
491 | struct elantech_data *etd = psmouse->private; | |
492 | struct elantech_attr_data *attr = data; | |
493 | unsigned char *reg = (unsigned char *) etd + attr->field_offset; | |
494 | int rc = 0; | |
495 | ||
496 | if (attr->reg) | |
497 | rc = elantech_read_reg(psmouse, attr->reg, reg); | |
498 | ||
499 | return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); | |
500 | } | |
501 | ||
502 | /* | |
503 | * Write a register value by writing a sysfs entry | |
504 | */ | |
505 | static ssize_t elantech_set_int_attr(struct psmouse *psmouse, | |
506 | void *data, const char *buf, size_t count) | |
507 | { | |
508 | struct elantech_data *etd = psmouse->private; | |
509 | struct elantech_attr_data *attr = data; | |
510 | unsigned char *reg = (unsigned char *) etd + attr->field_offset; | |
511 | unsigned long value; | |
512 | int err; | |
513 | ||
514 | err = strict_strtoul(buf, 16, &value); | |
515 | if (err) | |
516 | return err; | |
517 | ||
518 | if (value > 0xff) | |
519 | return -EINVAL; | |
520 | ||
521 | /* Do we need to preserve some bits for version 2 hardware too? */ | |
522 | if (etd->hw_version == 1) { | |
523 | if (attr->reg == 0x10) | |
524 | /* Force absolute mode always on */ | |
525 | value |= ETP_R10_ABSOLUTE_MODE; | |
526 | else if (attr->reg == 0x11) | |
527 | /* Force 4 byte mode always on */ | |
528 | value |= ETP_R11_4_BYTE_MODE; | |
529 | } | |
530 | ||
531 | if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) | |
532 | *reg = value; | |
533 | ||
534 | return count; | |
535 | } | |
536 | ||
537 | #define ELANTECH_INT_ATTR(_name, _register) \ | |
538 | static struct elantech_attr_data elantech_attr_##_name = { \ | |
539 | .field_offset = offsetof(struct elantech_data, _name), \ | |
540 | .reg = _register, \ | |
541 | }; \ | |
542 | PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ | |
543 | &elantech_attr_##_name, \ | |
544 | elantech_show_int_attr, \ | |
545 | elantech_set_int_attr) | |
546 | ||
547 | ELANTECH_INT_ATTR(reg_10, 0x10); | |
548 | ELANTECH_INT_ATTR(reg_11, 0x11); | |
549 | ELANTECH_INT_ATTR(reg_20, 0x20); | |
550 | ELANTECH_INT_ATTR(reg_21, 0x21); | |
551 | ELANTECH_INT_ATTR(reg_22, 0x22); | |
552 | ELANTECH_INT_ATTR(reg_23, 0x23); | |
553 | ELANTECH_INT_ATTR(reg_24, 0x24); | |
554 | ELANTECH_INT_ATTR(reg_25, 0x25); | |
555 | ELANTECH_INT_ATTR(reg_26, 0x26); | |
556 | ELANTECH_INT_ATTR(debug, 0); | |
557 | ELANTECH_INT_ATTR(paritycheck, 0); | |
558 | ||
559 | static struct attribute *elantech_attrs[] = { | |
560 | &psmouse_attr_reg_10.dattr.attr, | |
561 | &psmouse_attr_reg_11.dattr.attr, | |
562 | &psmouse_attr_reg_20.dattr.attr, | |
563 | &psmouse_attr_reg_21.dattr.attr, | |
564 | &psmouse_attr_reg_22.dattr.attr, | |
565 | &psmouse_attr_reg_23.dattr.attr, | |
566 | &psmouse_attr_reg_24.dattr.attr, | |
567 | &psmouse_attr_reg_25.dattr.attr, | |
568 | &psmouse_attr_reg_26.dattr.attr, | |
569 | &psmouse_attr_debug.dattr.attr, | |
570 | &psmouse_attr_paritycheck.dattr.attr, | |
571 | NULL | |
572 | }; | |
573 | ||
574 | static struct attribute_group elantech_attr_group = { | |
575 | .attrs = elantech_attrs, | |
576 | }; | |
577 | ||
578 | /* | |
579 | * Use magic knock to detect Elantech touchpad | |
580 | */ | |
b7802c5c | 581 | int elantech_detect(struct psmouse *psmouse, bool set_properties) |
2a0bd75e AO |
582 | { |
583 | struct ps2dev *ps2dev = &psmouse->ps2dev; | |
584 | unsigned char param[3]; | |
585 | ||
586 | ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); | |
587 | ||
588 | if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || | |
589 | ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || | |
590 | ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || | |
591 | ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || | |
592 | ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { | |
9ab7b25e | 593 | pr_debug("elantech.c: sending Elantech magic knock failed.\n"); |
2a0bd75e AO |
594 | return -1; |
595 | } | |
596 | ||
597 | /* | |
598 | * Report this in case there are Elantech models that use a different | |
599 | * set of magic numbers | |
600 | */ | |
601 | if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) { | |
9ab7b25e AO |
602 | pr_debug("elantech.c: " |
603 | "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", | |
604 | param[0], param[1], param[2]); | |
605 | return -1; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Query touchpad's firmware version and see if it reports known | |
610 | * value to avoid mis-detection. Logitech mice are known to respond | |
611 | * to Elantech magic knock and there might be more. | |
612 | */ | |
613 | if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { | |
614 | pr_debug("elantech.c: failed to query firmware version.\n"); | |
615 | return -1; | |
616 | } | |
617 | ||
618 | pr_debug("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", | |
619 | param[0], param[1], param[2]); | |
620 | ||
621 | if (param[0] == 0 || param[1] != 0) { | |
f81bc788 FR |
622 | if (!force_elantech) { |
623 | pr_debug("elantech.c: Probably not a real Elantech touchpad. Aborting.\n"); | |
624 | return -1; | |
625 | } | |
626 | ||
627 | pr_debug("elantech.c: Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n"); | |
2a0bd75e AO |
628 | } |
629 | ||
630 | if (set_properties) { | |
631 | psmouse->vendor = "Elantech"; | |
632 | psmouse->name = "Touchpad"; | |
633 | } | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Clean up sysfs entries when disconnecting | |
640 | */ | |
641 | static void elantech_disconnect(struct psmouse *psmouse) | |
642 | { | |
643 | sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, | |
644 | &elantech_attr_group); | |
645 | kfree(psmouse->private); | |
646 | psmouse->private = NULL; | |
647 | } | |
648 | ||
649 | /* | |
650 | * Put the touchpad back into absolute mode when reconnecting | |
651 | */ | |
652 | static int elantech_reconnect(struct psmouse *psmouse) | |
653 | { | |
654 | if (elantech_detect(psmouse, 0)) | |
655 | return -1; | |
656 | ||
657 | if (elantech_set_absolute_mode(psmouse)) { | |
658 | pr_err("elantech.c: failed to put touchpad back into absolute mode.\n"); | |
659 | return -1; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Initialize the touchpad and create sysfs entries | |
667 | */ | |
668 | int elantech_init(struct psmouse *psmouse) | |
669 | { | |
670 | struct elantech_data *etd; | |
671 | int i, error; | |
672 | unsigned char param[3]; | |
673 | ||
9ab7b25e | 674 | psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL); |
2a0bd75e AO |
675 | if (!etd) |
676 | return -1; | |
677 | ||
678 | etd->parity[0] = 1; | |
679 | for (i = 1; i < 256; i++) | |
680 | etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; | |
681 | ||
682 | /* | |
9ab7b25e | 683 | * Do the version query again so we can store the result |
2a0bd75e AO |
684 | */ |
685 | if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { | |
686 | pr_err("elantech.c: failed to query firmware version.\n"); | |
687 | goto init_fail; | |
688 | } | |
504e8bee DT |
689 | |
690 | etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; | |
2a0bd75e AO |
691 | |
692 | /* | |
693 | * Assume every version greater than this is new EeePC style | |
694 | * hardware with 6 byte packets | |
695 | */ | |
504e8bee | 696 | if (etd->fw_version >= 0x020030) { |
2a0bd75e AO |
697 | etd->hw_version = 2; |
698 | /* For now show extra debug information */ | |
699 | etd->debug = 1; | |
700 | /* Don't know how to do parity checking for version 2 */ | |
701 | etd->paritycheck = 0; | |
702 | } else { | |
703 | etd->hw_version = 1; | |
704 | etd->paritycheck = 1; | |
705 | } | |
504e8bee DT |
706 | |
707 | pr_info("elantech.c: assuming hardware version %d, firmware version %d.%d.%d\n", | |
708 | etd->hw_version, param[0], param[1], param[2]); | |
2a0bd75e AO |
709 | |
710 | if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) { | |
711 | pr_err("elantech.c: failed to query capabilities.\n"); | |
712 | goto init_fail; | |
713 | } | |
714 | pr_info("elantech.c: Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", | |
715 | param[0], param[1], param[2]); | |
716 | etd->capabilities = param[0]; | |
717 | ||
3f8c0df4 AO |
718 | /* |
719 | * This firmware seems to suffer from misreporting coordinates when | |
720 | * a touch action starts causing the mouse cursor or scrolled page | |
721 | * to jump. Enable a workaround. | |
722 | */ | |
504e8bee DT |
723 | if (etd->fw_version == 0x020022) { |
724 | pr_info("elantech.c: firmware version 2.0.34 detected, " | |
3f8c0df4 AO |
725 | "enabling jumpy cursor workaround\n"); |
726 | etd->jumpy_cursor = 1; | |
727 | } | |
728 | ||
2a0bd75e AO |
729 | if (elantech_set_absolute_mode(psmouse)) { |
730 | pr_err("elantech.c: failed to put touchpad into absolute mode.\n"); | |
731 | goto init_fail; | |
732 | } | |
733 | ||
734 | elantech_set_input_params(psmouse); | |
735 | ||
736 | error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, | |
737 | &elantech_attr_group); | |
738 | if (error) { | |
739 | pr_err("elantech.c: failed to create sysfs attributes, error: %d.\n", | |
740 | error); | |
741 | goto init_fail; | |
742 | } | |
743 | ||
744 | psmouse->protocol_handler = elantech_process_byte; | |
745 | psmouse->disconnect = elantech_disconnect; | |
746 | psmouse->reconnect = elantech_reconnect; | |
747 | psmouse->pktsize = etd->hw_version == 2 ? 6 : 4; | |
748 | ||
749 | return 0; | |
750 | ||
751 | init_fail: | |
752 | kfree(etd); | |
753 | return -1; | |
754 | } |