1 Elantech Touchpad Driver 1 Elantech Touchpad Driver
2 ======================== 2 ========================
3 3
4 Copyright (C) 2007-2008 Arjan Opmeer <a 4 Copyright (C) 2007-2008 Arjan Opmeer <arjan@opmeer.net>
5 5
6 Extra information for hardware version 6 Extra information for hardware version 1 found and
7 provided by Steve Havelka 7 provided by Steve Havelka
8 8
9 Version 2 (EeePC) hardware support bas 9 Version 2 (EeePC) hardware support based on patches
10 received from Woody at Xandros and for 10 received from Woody at Xandros and forwarded to me
11 by user StewieGriffin at the eeeuser.c 11 by user StewieGriffin at the eeeuser.com forum
12 12
13 .. Contents 13 .. Contents
14 14
15 1. Introduction 15 1. Introduction
16 2. Extra knobs 16 2. Extra knobs
17 3. Differentiating hardware versions 17 3. Differentiating hardware versions
18 4. Hardware version 1 18 4. Hardware version 1
19 4.1 Registers 19 4.1 Registers
20 4.2 Native relative mode 4 byte packet for 20 4.2 Native relative mode 4 byte packet format
21 4.3 Native absolute mode 4 byte packet for 21 4.3 Native absolute mode 4 byte packet format
22 5. Hardware version 2 22 5. Hardware version 2
23 5.1 Registers 23 5.1 Registers
24 5.2 Native absolute mode 6 byte packet for 24 5.2 Native absolute mode 6 byte packet format
25 5.2.1 Parity checking and packet re-sy 25 5.2.1 Parity checking and packet re-synchronization
26 5.2.2 One/Three finger touch 26 5.2.2 One/Three finger touch
27 5.2.3 Two finger touch 27 5.2.3 Two finger touch
28 6. Hardware version 3 28 6. Hardware version 3
29 6.1 Registers 29 6.1 Registers
30 6.2 Native absolute mode 6 byte packet for 30 6.2 Native absolute mode 6 byte packet format
31 6.2.1 One/Three finger touch 31 6.2.1 One/Three finger touch
32 6.2.2 Two finger touch 32 6.2.2 Two finger touch
33 7. Hardware version 4 33 7. Hardware version 4
34 7.1 Registers 34 7.1 Registers
35 7.2 Native absolute mode 6 byte packet for 35 7.2 Native absolute mode 6 byte packet format
36 7.2.1 Status packet 36 7.2.1 Status packet
37 7.2.2 Head packet 37 7.2.2 Head packet
38 7.2.3 Motion packet 38 7.2.3 Motion packet
39 8. Trackpoint (for Hardware version 3 and 4) 39 8. Trackpoint (for Hardware version 3 and 4)
40 8.1 Registers 40 8.1 Registers
41 8.2 Native relative mode 6 byte packet for 41 8.2 Native relative mode 6 byte packet format
42 8.2.1 Status Packet 42 8.2.1 Status Packet
43 43
44 44
45 45
46 Introduction 46 Introduction
47 ~~~~~~~~~~~~ 47 ~~~~~~~~~~~~
48 48
49 Currently the Linux Elantech touchpad driver i 49 Currently the Linux Elantech touchpad driver is aware of four different
50 hardware versions unimaginatively called versi 50 hardware versions unimaginatively called version 1,version 2, version 3
51 and version 4. Version 1 is found in "older" l 51 and version 4. Version 1 is found in "older" laptops and uses 4 bytes per
52 packet. Version 2 seems to be introduced with 52 packet. Version 2 seems to be introduced with the EeePC and uses 6 bytes
53 per packet, and provides additional features s 53 per packet, and provides additional features such as position of two fingers,
54 and width of the touch. Hardware version 3 us 54 and width of the touch. Hardware version 3 uses 6 bytes per packet (and
55 for 2 fingers the concatenation of two 6 bytes 55 for 2 fingers the concatenation of two 6 bytes packets) and allows tracking
56 of up to 3 fingers. Hardware version 4 uses 6 56 of up to 3 fingers. Hardware version 4 uses 6 bytes per packet, and can
57 combine a status packet with multiple head or 57 combine a status packet with multiple head or motion packets. Hardware version
58 4 allows tracking up to 5 fingers. 58 4 allows tracking up to 5 fingers.
59 59
60 Some Hardware version 3 and version 4 also hav 60 Some Hardware version 3 and version 4 also have a trackpoint which uses a
61 separate packet format. It is also 6 bytes per 61 separate packet format. It is also 6 bytes per packet.
62 62
63 The driver tries to support both hardware vers 63 The driver tries to support both hardware versions and should be compatible
64 with the Xorg Synaptics touchpad driver and it 64 with the Xorg Synaptics touchpad driver and its graphical configuration
65 utilities. 65 utilities.
66 66
67 Note that a mouse button is also associated wi 67 Note that a mouse button is also associated with either the touchpad or the
68 trackpoint when a trackpoint is available. Di 68 trackpoint when a trackpoint is available. Disabling the Touchpad in xorg
69 (TouchPadOff=0) will also disable the buttons 69 (TouchPadOff=0) will also disable the buttons associated with the touchpad.
70 70
71 Additionally the operation of the touchpad can 71 Additionally the operation of the touchpad can be altered by adjusting the
72 contents of some of its internal registers. Th 72 contents of some of its internal registers. These registers are represented
73 by the driver as sysfs entries under /sys/bus/ 73 by the driver as sysfs entries under /sys/bus/serio/drivers/psmouse/serio?
74 that can be read from and written to. 74 that can be read from and written to.
75 75
76 Currently only the registers for hardware vers 76 Currently only the registers for hardware version 1 are somewhat understood.
77 Hardware version 2 seems to use some of the sa 77 Hardware version 2 seems to use some of the same registers but it is not
78 known whether the bits in the registers repres 78 known whether the bits in the registers represent the same thing or might
79 have changed their meaning. 79 have changed their meaning.
80 80
81 On top of that, some register settings have ef 81 On top of that, some register settings have effect only when the touchpad is
82 in relative mode and not in absolute mode. As 82 in relative mode and not in absolute mode. As the Linux Elantech touchpad
83 driver always puts the hardware into absolute 83 driver always puts the hardware into absolute mode not all information
84 mentioned below can be used immediately. But b 84 mentioned below can be used immediately. But because there is no freely
85 available Elantech documentation the informati 85 available Elantech documentation the information is provided here anyway for
86 completeness sake. 86 completeness sake.
87 87
88 88
89 Extra knobs 89 Extra knobs
90 ~~~~~~~~~~~ 90 ~~~~~~~~~~~
91 91
92 Currently the Linux Elantech touchpad driver p 92 Currently the Linux Elantech touchpad driver provides three extra knobs under
93 /sys/bus/serio/drivers/psmouse/serio? for the 93 /sys/bus/serio/drivers/psmouse/serio? for the user.
94 94
95 * debug 95 * debug
96 96
97 Turn different levels of debugging ON or OF 97 Turn different levels of debugging ON or OFF.
98 98
99 By echoing "0" to this file all debugging w 99 By echoing "0" to this file all debugging will be turned OFF.
100 100
101 Currently a value of "1" will turn on some 101 Currently a value of "1" will turn on some basic debugging and a value of
102 "2" will turn on packet debugging. For hard 102 "2" will turn on packet debugging. For hardware version 1 the default is
103 OFF. For version 2 the default is "1". 103 OFF. For version 2 the default is "1".
104 104
105 Turning packet debugging on will make the d 105 Turning packet debugging on will make the driver dump every packet
106 received to the syslog before processing it 106 received to the syslog before processing it. Be warned that this can
107 generate quite a lot of data! 107 generate quite a lot of data!
108 108
109 * paritycheck 109 * paritycheck
110 110
111 Turns parity checking ON or OFF. 111 Turns parity checking ON or OFF.
112 112
113 By echoing "0" to this file parity checking 113 By echoing "0" to this file parity checking will be turned OFF. Any
114 non-zero value will turn it ON. For hardwar 114 non-zero value will turn it ON. For hardware version 1 the default is ON.
115 For version 2 the default it is OFF. 115 For version 2 the default it is OFF.
116 116
117 Hardware version 1 provides basic data inte 117 Hardware version 1 provides basic data integrity verification by
118 calculating a parity bit for the last 3 byt 118 calculating a parity bit for the last 3 bytes of each packet. The driver
119 can check these bits and reject any packet 119 can check these bits and reject any packet that appears corrupted. Using
120 this knob you can bypass that check. 120 this knob you can bypass that check.
121 121
122 Hardware version 2 does not provide the sam 122 Hardware version 2 does not provide the same parity bits. Only some basic
123 data consistency checking can be done. For 123 data consistency checking can be done. For now checking is disabled by
124 default. Currently even turning it on will 124 default. Currently even turning it on will do nothing.
125 125
126 * crc_enabled 126 * crc_enabled
127 127
128 Sets crc_enabled to 0/1. The name "crc_enab 128 Sets crc_enabled to 0/1. The name "crc_enabled" is the official name of
129 this integrity check, even though it is not 129 this integrity check, even though it is not an actual cyclic redundancy
130 check. 130 check.
131 131
132 Depending on the state of crc_enabled, cert 132 Depending on the state of crc_enabled, certain basic data integrity
133 verification is done by the driver on hardw 133 verification is done by the driver on hardware version 3 and 4. The
134 driver will reject any packet that appears 134 driver will reject any packet that appears corrupted. Using this knob,
135 The state of crc_enabled can be altered wit 135 The state of crc_enabled can be altered with this knob.
136 136
137 Reading the crc_enabled value will show the 137 Reading the crc_enabled value will show the active value. Echoing
138 "0" or "1" to this file will set the state 138 "0" or "1" to this file will set the state to "0" or "1".
139 139
140 Differentiating hardware versions 140 Differentiating hardware versions
141 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 141 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
142 142
143 To detect the hardware version, read the versi 143 To detect the hardware version, read the version number as param[0].param[1].param[2]::
144 144
145 4 bytes version: (after the arrow is the name 145 4 bytes version: (after the arrow is the name given in the Dell-provided driver)
146 02.00.22 => EF013 146 02.00.22 => EF013
147 02.06.00 => EF019 147 02.06.00 => EF019
148 148
149 In the wild, there appear to be more versions, 149 In the wild, there appear to be more versions, such as 00.01.64, 01.00.21,
150 02.00.00, 02.00.04, 02.00.06:: 150 02.00.00, 02.00.04, 02.00.06::
151 151
152 6 bytes: 152 6 bytes:
153 02.00.30 => EF113 153 02.00.30 => EF113
154 02.08.00 => EF023 154 02.08.00 => EF023
155 02.08.XX => EF123 155 02.08.XX => EF123
156 02.0B.00 => EF215 156 02.0B.00 => EF215
157 04.01.XX => Scroll_EF051 157 04.01.XX => Scroll_EF051
158 04.02.XX => EF051 158 04.02.XX => EF051
159 159
160 In the wild, there appear to be more versions, 160 In the wild, there appear to be more versions, such as 04.03.01, 04.04.11. There
161 appears to be almost no difference, except for 161 appears to be almost no difference, except for EF113, which does not report
162 pressure/width and has different data consiste 162 pressure/width and has different data consistency checks.
163 163
164 Probably all the versions with param[0] <= 01 164 Probably all the versions with param[0] <= 01 can be considered as
165 4 bytes/firmware 1. The versions < 02.08.00, w 165 4 bytes/firmware 1. The versions < 02.08.00, with the exception of 02.00.30, as
166 4 bytes/firmware 2. Everything >= 02.08.00 can 166 4 bytes/firmware 2. Everything >= 02.08.00 can be considered as 6 bytes.
167 167
168 168
169 Hardware version 1 169 Hardware version 1
170 ~~~~~~~~~~~~~~~~~~ 170 ~~~~~~~~~~~~~~~~~~
171 171
172 Registers 172 Registers
173 --------- 173 ---------
174 174
175 By echoing a hexadecimal value to a register i 175 By echoing a hexadecimal value to a register it contents can be altered.
176 176
177 For example:: 177 For example::
178 178
179 echo -n 0x16 > reg_10 179 echo -n 0x16 > reg_10
180 180
181 * reg_10:: 181 * reg_10::
182 182
183 bit 7 6 5 4 3 2 1 0 183 bit 7 6 5 4 3 2 1 0
184 B C T D L A S E 184 B C T D L A S E
185 185
186 E: 1 = enable smart edges uncondition 186 E: 1 = enable smart edges unconditionally
187 S: 1 = enable smart edges only when d 187 S: 1 = enable smart edges only when dragging
188 A: 1 = absolute mode (needs 4 byte pa 188 A: 1 = absolute mode (needs 4 byte packets, see reg_11)
189 L: 1 = enable drag lock (see reg_22) 189 L: 1 = enable drag lock (see reg_22)
190 D: 1 = disable dynamic resolution 190 D: 1 = disable dynamic resolution
191 T: 1 = disable tapping 191 T: 1 = disable tapping
192 C: 1 = enable corner tap 192 C: 1 = enable corner tap
193 B: 1 = swap left and right button 193 B: 1 = swap left and right button
194 194
195 * reg_11:: 195 * reg_11::
196 196
197 bit 7 6 5 4 3 2 1 0 197 bit 7 6 5 4 3 2 1 0
198 1 0 0 H V 1 F P 198 1 0 0 H V 1 F P
199 199
200 P: 1 = enable parity checking for rel 200 P: 1 = enable parity checking for relative mode
201 F: 1 = enable native 4 byte packet mo 201 F: 1 = enable native 4 byte packet mode
202 V: 1 = enable vertical scroll area 202 V: 1 = enable vertical scroll area
203 H: 1 = enable horizontal scroll area 203 H: 1 = enable horizontal scroll area
204 204
205 * reg_20:: 205 * reg_20::
206 206
207 single finger width? 207 single finger width?
208 208
209 * reg_21:: 209 * reg_21::
210 210
211 scroll area width (small: 0x40 ... wi 211 scroll area width (small: 0x40 ... wide: 0xff)
212 212
213 * reg_22:: 213 * reg_22::
214 214
215 drag lock time out (short: 0x14 ... l 215 drag lock time out (short: 0x14 ... long: 0xfe;
216 0xff = tap again 216 0xff = tap again to release)
217 217
218 * reg_23:: 218 * reg_23::
219 219
220 tap make timeout? 220 tap make timeout?
221 221
222 * reg_24:: 222 * reg_24::
223 223
224 tap release timeout? 224 tap release timeout?
225 225
226 * reg_25:: 226 * reg_25::
227 227
228 smart edge cursor speed (0x02 = slow, 228 smart edge cursor speed (0x02 = slow, 0x03 = medium, 0x04 = fast)
229 229
230 * reg_26:: 230 * reg_26::
231 231
232 smart edge activation area width? 232 smart edge activation area width?
233 233
234 234
235 Native relative mode 4 byte packet format 235 Native relative mode 4 byte packet format
236 ----------------------------------------- 236 -----------------------------------------
237 237
238 byte 0:: 238 byte 0::
239 239
240 bit 7 6 5 4 3 2 1 0 240 bit 7 6 5 4 3 2 1 0
241 c c p2 p1 1 M R L 241 c c p2 p1 1 M R L
242 242
243 L, R, M = 1 when Left, Right, Middle 243 L, R, M = 1 when Left, Right, Middle mouse button pressed
244 some models have M as byte 3 odd p 244 some models have M as byte 3 odd parity bit
245 when parity checking is enabled (reg_ 245 when parity checking is enabled (reg_11, P = 1):
246 p1..p2 = byte 1 and 2 odd parity b 246 p1..p2 = byte 1 and 2 odd parity bit
247 c = 1 when corner tap detected 247 c = 1 when corner tap detected
248 248
249 byte 1:: 249 byte 1::
250 250
251 bit 7 6 5 4 3 2 1 0 251 bit 7 6 5 4 3 2 1 0
252 dx7 dx6 dx5 dx4 dx3 dx2 dx1 dx0 252 dx7 dx6 dx5 dx4 dx3 dx2 dx1 dx0
253 253
254 dx7..dx0 = x movement; positive = r 254 dx7..dx0 = x movement; positive = right, negative = left
255 byte 1 = 0xf0 when corner tap detecte 255 byte 1 = 0xf0 when corner tap detected
256 256
257 byte 2:: 257 byte 2::
258 258
259 bit 7 6 5 4 3 2 1 0 259 bit 7 6 5 4 3 2 1 0
260 dy7 dy6 dy5 dy4 dy3 dy2 dy1 dy0 260 dy7 dy6 dy5 dy4 dy3 dy2 dy1 dy0
261 261
262 dy7..dy0 = y movement; positive = u 262 dy7..dy0 = y movement; positive = up, negative = down
263 263
264 byte 3:: 264 byte 3::
265 265
266 parity checking enabled (reg_11, P = 1): 266 parity checking enabled (reg_11, P = 1):
267 267
268 bit 7 6 5 4 3 2 1 0 268 bit 7 6 5 4 3 2 1 0
269 w h n1 n0 ds3 ds2 ds1 ds0 269 w h n1 n0 ds3 ds2 ds1 ds0
270 270
271 normally: 271 normally:
272 ds3..ds0 = scroll wheel amount 272 ds3..ds0 = scroll wheel amount and direction
273 positive = down or l 273 positive = down or left
274 negative = up or rig 274 negative = up or right
275 when corner tap detected: 275 when corner tap detected:
276 ds0 = 1 when top right corner t 276 ds0 = 1 when top right corner tapped
277 ds1 = 1 when bottom right corne 277 ds1 = 1 when bottom right corner tapped
278 ds2 = 1 when bottom left corner 278 ds2 = 1 when bottom left corner tapped
279 ds3 = 1 when top left corner ta 279 ds3 = 1 when top left corner tapped
280 n1..n0 = number of fingers on touc 280 n1..n0 = number of fingers on touchpad
281 only models with firmware 2.x r 281 only models with firmware 2.x report this, models with
282 firmware 1.x seem to map one, t 282 firmware 1.x seem to map one, two and three finger taps
283 directly to L, M and R mouse bu 283 directly to L, M and R mouse buttons
284 h = 1 when horizontal scroll actio 284 h = 1 when horizontal scroll action
285 w = 1 when wide finger touch? 285 w = 1 when wide finger touch?
286 286
287 otherwise (reg_11, P = 0): 287 otherwise (reg_11, P = 0):
288 288
289 bit 7 6 5 4 3 2 1 0 289 bit 7 6 5 4 3 2 1 0
290 ds7 ds6 ds5 ds4 ds3 ds2 ds1 ds0 290 ds7 ds6 ds5 ds4 ds3 ds2 ds1 ds0
291 291
292 ds7..ds0 = vertical scroll amount 292 ds7..ds0 = vertical scroll amount and direction
293 negative = up 293 negative = up
294 positive = down 294 positive = down
295 295
296 296
297 Native absolute mode 4 byte packet format 297 Native absolute mode 4 byte packet format
298 ----------------------------------------- 298 -----------------------------------------
299 299
300 EF013 and EF019 have a special behaviour (due 300 EF013 and EF019 have a special behaviour (due to a bug in the firmware?), and
301 when 1 finger is touching, the first 2 positio 301 when 1 finger is touching, the first 2 position reports must be discarded.
302 This counting is reset whenever a different nu 302 This counting is reset whenever a different number of fingers is reported.
303 303
304 byte 0:: 304 byte 0::
305 305
306 firmware version 1.x: 306 firmware version 1.x:
307 307
308 bit 7 6 5 4 3 2 1 0 308 bit 7 6 5 4 3 2 1 0
309 D U p1 p2 1 p3 R L 309 D U p1 p2 1 p3 R L
310 310
311 L, R = 1 when Left, Right mouse bu 311 L, R = 1 when Left, Right mouse button pressed
312 p1..p3 = byte 1..3 odd parity bit 312 p1..p3 = byte 1..3 odd parity bit
313 D, U = 1 when rocker switch presse 313 D, U = 1 when rocker switch pressed Up, Down
314 314
315 firmware version 2.x: 315 firmware version 2.x:
316 316
317 bit 7 6 5 4 3 2 1 0 317 bit 7 6 5 4 3 2 1 0
318 n1 n0 p2 p1 1 p3 R L 318 n1 n0 p2 p1 1 p3 R L
319 319
320 L, R = 1 when Left, Right mouse bu 320 L, R = 1 when Left, Right mouse button pressed
321 p1..p3 = byte 1..3 odd parity bit 321 p1..p3 = byte 1..3 odd parity bit
322 n1..n0 = number of fingers on touc 322 n1..n0 = number of fingers on touchpad
323 323
324 byte 1:: 324 byte 1::
325 325
326 firmware version 1.x: 326 firmware version 1.x:
327 327
328 bit 7 6 5 4 3 2 1 0 328 bit 7 6 5 4 3 2 1 0
329 f 0 th tw x9 x8 y9 y8 329 f 0 th tw x9 x8 y9 y8
330 330
331 tw = 1 when two finger touch 331 tw = 1 when two finger touch
332 th = 1 when three finger touch 332 th = 1 when three finger touch
333 f = 1 when finger touch 333 f = 1 when finger touch
334 334
335 firmware version 2.x: 335 firmware version 2.x:
336 336
337 bit 7 6 5 4 3 2 1 0 337 bit 7 6 5 4 3 2 1 0
338 . . . . x9 x8 y9 y8 338 . . . . x9 x8 y9 y8
339 339
340 byte 2:: 340 byte 2::
341 341
342 bit 7 6 5 4 3 2 1 0 342 bit 7 6 5 4 3 2 1 0
343 x7 x6 x5 x4 x3 x2 x1 x0 343 x7 x6 x5 x4 x3 x2 x1 x0
344 344
345 x9..x0 = absolute x value (horizontal 345 x9..x0 = absolute x value (horizontal)
346 346
347 byte 3:: 347 byte 3::
348 348
349 bit 7 6 5 4 3 2 1 0 349 bit 7 6 5 4 3 2 1 0
350 y7 y6 y5 y4 y3 y2 y1 y0 350 y7 y6 y5 y4 y3 y2 y1 y0
351 351
352 y9..y0 = absolute y value (vertical) 352 y9..y0 = absolute y value (vertical)
353 353
354 354
355 Hardware version 2 355 Hardware version 2
356 ~~~~~~~~~~~~~~~~~~ 356 ~~~~~~~~~~~~~~~~~~
357 357
358 358
359 Registers 359 Registers
360 --------- 360 ---------
361 361
362 By echoing a hexadecimal value to a register i 362 By echoing a hexadecimal value to a register it contents can be altered.
363 363
364 For example:: 364 For example::
365 365
366 echo -n 0x56 > reg_10 366 echo -n 0x56 > reg_10
367 367
368 * reg_10:: 368 * reg_10::
369 369
370 bit 7 6 5 4 3 2 1 0 370 bit 7 6 5 4 3 2 1 0
371 0 1 0 1 0 1 D 0 371 0 1 0 1 0 1 D 0
372 372
373 D: 1 = enable drag and drop 373 D: 1 = enable drag and drop
374 374
375 * reg_11:: 375 * reg_11::
376 376
377 bit 7 6 5 4 3 2 1 0 377 bit 7 6 5 4 3 2 1 0
378 1 0 0 0 S 0 1 0 378 1 0 0 0 S 0 1 0
379 379
380 S: 1 = enable vertical scroll 380 S: 1 = enable vertical scroll
381 381
382 * reg_21:: 382 * reg_21::
383 383
384 unknown (0x00) 384 unknown (0x00)
385 385
386 * reg_22:: 386 * reg_22::
387 387
388 drag and drop release time out (short 388 drag and drop release time out (short: 0x70 ... long 0x7e;
389 0x7f = neve 389 0x7f = never i.e. tap again to release)
390 390
391 391
392 Native absolute mode 6 byte packet format 392 Native absolute mode 6 byte packet format
393 ----------------------------------------- 393 -----------------------------------------
394 394
395 Parity checking and packet re-synchronization 395 Parity checking and packet re-synchronization
396 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 396 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
397 397
398 There is no parity checking, however some cons 398 There is no parity checking, however some consistency checks can be performed.
399 399
400 For instance for EF113:: 400 For instance for EF113::
401 401
402 SA1= packet[0]; 402 SA1= packet[0];
403 A1 = packet[1]; 403 A1 = packet[1];
404 B1 = packet[2]; 404 B1 = packet[2];
405 SB1= packet[3]; 405 SB1= packet[3];
406 C1 = packet[4]; 406 C1 = packet[4];
407 D1 = packet[5]; 407 D1 = packet[5];
408 if( (((SA1 & 0x3C) != 0x3C) && ((SA1 & 408 if( (((SA1 & 0x3C) != 0x3C) && ((SA1 & 0xC0) != 0x80)) || // check Byte 1
409 (((SA1 & 0x0C) != 0x0C) && ((SA1 & 409 (((SA1 & 0x0C) != 0x0C) && ((SA1 & 0xC0) == 0x80)) || // check Byte 1 (one finger pressed)
410 (((SA1 & 0xC0) != 0x80) && (( A1 & 410 (((SA1 & 0xC0) != 0x80) && (( A1 & 0xF0) != 0x00)) || // check Byte 2
411 (((SB1 & 0x3E) != 0x38) && ((SA1 & 411 (((SB1 & 0x3E) != 0x38) && ((SA1 & 0xC0) != 0x80)) || // check Byte 4
412 (((SB1 & 0x0E) != 0x08) && ((SA1 & 412 (((SB1 & 0x0E) != 0x08) && ((SA1 & 0xC0) == 0x80)) || // check Byte 4 (one finger pressed)
413 (((SA1 & 0xC0) != 0x80) && (( C1 & 413 (((SA1 & 0xC0) != 0x80) && (( C1 & 0xF0) != 0x00)) ) // check Byte 5
414 // error detected 414 // error detected
415 415
416 For all the other ones, there are just a few c 416 For all the other ones, there are just a few constant bits::
417 417
418 if( ((packet[0] & 0x0C) != 0x04) || 418 if( ((packet[0] & 0x0C) != 0x04) ||
419 ((packet[3] & 0x0f) != 0x02) ) 419 ((packet[3] & 0x0f) != 0x02) )
420 // error detected 420 // error detected
421 421
422 422
423 In case an error is detected, all the packets 423 In case an error is detected, all the packets are shifted by one (and packet[0] is discarded).
424 424
425 One/Three finger touch 425 One/Three finger touch
426 ^^^^^^^^^^^^^^^^^^^^^^ 426 ^^^^^^^^^^^^^^^^^^^^^^
427 427
428 byte 0:: 428 byte 0::
429 429
430 bit 7 6 5 4 3 2 1 0 430 bit 7 6 5 4 3 2 1 0
431 n1 n0 w3 w2 . . R L 431 n1 n0 w3 w2 . . R L
432 432
433 L, R = 1 when Left, Right mouse butto 433 L, R = 1 when Left, Right mouse button pressed
434 n1..n0 = number of fingers on touchpa 434 n1..n0 = number of fingers on touchpad
435 435
436 byte 1:: 436 byte 1::
437 437
438 bit 7 6 5 4 3 2 1 0 438 bit 7 6 5 4 3 2 1 0
439 p7 p6 p5 p4 x11 x10 x9 x8 439 p7 p6 p5 p4 x11 x10 x9 x8
440 440
441 byte 2:: 441 byte 2::
442 442
443 bit 7 6 5 4 3 2 1 0 443 bit 7 6 5 4 3 2 1 0
444 x7 x6 x5 x4 x3 x2 x1 x0 444 x7 x6 x5 x4 x3 x2 x1 x0
445 445
446 x11..x0 = absolute x value (horizonta 446 x11..x0 = absolute x value (horizontal)
447 447
448 byte 3:: 448 byte 3::
449 449
450 bit 7 6 5 4 3 2 1 0 450 bit 7 6 5 4 3 2 1 0
451 n4 vf w1 w0 . . . b2 451 n4 vf w1 w0 . . . b2
452 452
453 n4 = set if more than 3 fingers (only 453 n4 = set if more than 3 fingers (only in 3 fingers mode)
454 vf = a kind of flag ? (only on EF123, 454 vf = a kind of flag ? (only on EF123, 0 when finger is over one
455 of the buttons, 1 otherwise) 455 of the buttons, 1 otherwise)
456 w3..w0 = width of the finger touch (n 456 w3..w0 = width of the finger touch (not EF113)
457 b2 (on EF113 only, 0 otherwise), b2.R 457 b2 (on EF113 only, 0 otherwise), b2.R.L indicates one button pressed:
458 0 = none 458 0 = none
459 1 = Left 459 1 = Left
460 2 = Right 460 2 = Right
461 3 = Middle (Left and Right) 461 3 = Middle (Left and Right)
462 4 = Forward 462 4 = Forward
463 5 = Back 463 5 = Back
464 6 = Another one 464 6 = Another one
465 7 = Another one 465 7 = Another one
466 466
467 byte 4:: 467 byte 4::
468 468
469 bit 7 6 5 4 3 2 1 0 469 bit 7 6 5 4 3 2 1 0
470 p3 p1 p2 p0 y11 y10 y9 y8 470 p3 p1 p2 p0 y11 y10 y9 y8
471 471
472 p7..p0 = pressure (not EF113) 472 p7..p0 = pressure (not EF113)
473 473
474 byte 5:: 474 byte 5::
475 475
476 bit 7 6 5 4 3 2 1 0 476 bit 7 6 5 4 3 2 1 0
477 y7 y6 y5 y4 y3 y2 y1 y0 477 y7 y6 y5 y4 y3 y2 y1 y0
478 478
479 y11..y0 = absolute y value (vertical) 479 y11..y0 = absolute y value (vertical)
480 480
481 481
482 Two finger touch 482 Two finger touch
483 ^^^^^^^^^^^^^^^^ 483 ^^^^^^^^^^^^^^^^
484 484
485 Note that the two pairs of coordinates are not 485 Note that the two pairs of coordinates are not exactly the coordinates of the
486 two fingers, but only the pair of the lower-le 486 two fingers, but only the pair of the lower-left and upper-right coordinates.
487 So the actual fingers might be situated on the 487 So the actual fingers might be situated on the other diagonal of the square
488 defined by these two points. 488 defined by these two points.
489 489
490 byte 0:: 490 byte 0::
491 491
492 bit 7 6 5 4 3 2 1 0 492 bit 7 6 5 4 3 2 1 0
493 n1 n0 ay8 ax8 . . R L 493 n1 n0 ay8 ax8 . . R L
494 494
495 L, R = 1 when Left, Right mouse butto 495 L, R = 1 when Left, Right mouse button pressed
496 n1..n0 = number of fingers on touchpa 496 n1..n0 = number of fingers on touchpad
497 497
498 byte 1:: 498 byte 1::
499 499
500 bit 7 6 5 4 3 2 1 0 500 bit 7 6 5 4 3 2 1 0
501 ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 501 ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
502 502
503 ax8..ax0 = lower-left finger absolute 503 ax8..ax0 = lower-left finger absolute x value
504 504
505 byte 2:: 505 byte 2::
506 506
507 bit 7 6 5 4 3 2 1 0 507 bit 7 6 5 4 3 2 1 0
508 ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 508 ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
509 509
510 ay8..ay0 = lower-left finger absolute 510 ay8..ay0 = lower-left finger absolute y value
511 511
512 byte 3:: 512 byte 3::
513 513
514 bit 7 6 5 4 3 2 1 0 514 bit 7 6 5 4 3 2 1 0
515 . . by8 bx8 . . . . 515 . . by8 bx8 . . . .
516 516
517 byte 4:: 517 byte 4::
518 518
519 bit 7 6 5 4 3 2 1 0 519 bit 7 6 5 4 3 2 1 0
520 bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 520 bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
521 521
522 bx8..bx0 = upper-right finger absolut 522 bx8..bx0 = upper-right finger absolute x value
523 523
524 byte 5:: 524 byte 5::
525 525
526 bit 7 6 5 4 3 2 1 0 526 bit 7 6 5 4 3 2 1 0
527 by7 by8 by5 by4 by3 by2 by1 by0 527 by7 by8 by5 by4 by3 by2 by1 by0
528 528
529 by8..by0 = upper-right finger absolut 529 by8..by0 = upper-right finger absolute y value
530 530
531 Hardware version 3 531 Hardware version 3
532 ~~~~~~~~~~~~~~~~~~ 532 ~~~~~~~~~~~~~~~~~~
533 533
534 Registers 534 Registers
535 --------- 535 ---------
536 536
537 * reg_10:: 537 * reg_10::
538 538
539 bit 7 6 5 4 3 2 1 0 539 bit 7 6 5 4 3 2 1 0
540 0 0 0 0 R F T A 540 0 0 0 0 R F T A
541 541
542 A: 1 = enable absolute tracking 542 A: 1 = enable absolute tracking
543 T: 1 = enable two finger mode auto co 543 T: 1 = enable two finger mode auto correct
544 F: 1 = disable ABS Position Filter 544 F: 1 = disable ABS Position Filter
545 R: 1 = enable real hardware resolutio 545 R: 1 = enable real hardware resolution
546 546
547 Native absolute mode 6 byte packet format 547 Native absolute mode 6 byte packet format
548 ----------------------------------------- 548 -----------------------------------------
549 549
550 1 and 3 finger touch shares the same 6-byte pa 550 1 and 3 finger touch shares the same 6-byte packet format, except that
551 3 finger touch only reports the position of th 551 3 finger touch only reports the position of the center of all three fingers.
552 552
553 Firmware would send 12 bytes of data for 2 fin 553 Firmware would send 12 bytes of data for 2 finger touch.
554 554
555 Note on debounce: 555 Note on debounce:
556 In case the box has unstable power supply or o 556 In case the box has unstable power supply or other electricity issues, or
557 when number of finger changes, F/W would send 557 when number of finger changes, F/W would send "debounce packet" to inform
558 driver that the hardware is in debounce status 558 driver that the hardware is in debounce status.
559 The debouce packet has the following signature 559 The debouce packet has the following signature::
560 560
561 byte 0: 0xc4 561 byte 0: 0xc4
562 byte 1: 0xff 562 byte 1: 0xff
563 byte 2: 0xff 563 byte 2: 0xff
564 byte 3: 0x02 564 byte 3: 0x02
565 byte 4: 0xff 565 byte 4: 0xff
566 byte 5: 0xff 566 byte 5: 0xff
567 567
568 When we encounter this kind of packet, we just 568 When we encounter this kind of packet, we just ignore it.
569 569
570 One/Three finger touch 570 One/Three finger touch
571 ^^^^^^^^^^^^^^^^^^^^^^ 571 ^^^^^^^^^^^^^^^^^^^^^^
572 572
573 byte 0:: 573 byte 0::
574 574
575 bit 7 6 5 4 3 2 1 0 575 bit 7 6 5 4 3 2 1 0
576 n1 n0 w3 w2 0 1 R L 576 n1 n0 w3 w2 0 1 R L
577 577
578 L, R = 1 when Left, Right mouse button 578 L, R = 1 when Left, Right mouse button pressed
579 n1..n0 = number of fingers on touchpad 579 n1..n0 = number of fingers on touchpad
580 580
581 byte 1:: 581 byte 1::
582 582
583 bit 7 6 5 4 3 2 1 0 583 bit 7 6 5 4 3 2 1 0
584 p7 p6 p5 p4 x11 x10 x9 x8 584 p7 p6 p5 p4 x11 x10 x9 x8
585 585
586 byte 2:: 586 byte 2::
587 587
588 bit 7 6 5 4 3 2 1 0 588 bit 7 6 5 4 3 2 1 0
589 x7 x6 x5 x4 x3 x2 x1 x0 589 x7 x6 x5 x4 x3 x2 x1 x0
590 590
591 x11..x0 = absolute x value (horizontal 591 x11..x0 = absolute x value (horizontal)
592 592
593 byte 3:: 593 byte 3::
594 594
595 bit 7 6 5 4 3 2 1 0 595 bit 7 6 5 4 3 2 1 0
596 0 0 w1 w0 0 0 1 0 596 0 0 w1 w0 0 0 1 0
597 597
598 w3..w0 = width of the finger touch 598 w3..w0 = width of the finger touch
599 599
600 byte 4:: 600 byte 4::
601 601
602 bit 7 6 5 4 3 2 1 0 602 bit 7 6 5 4 3 2 1 0
603 p3 p1 p2 p0 y11 y10 y9 y8 603 p3 p1 p2 p0 y11 y10 y9 y8
604 604
605 p7..p0 = pressure 605 p7..p0 = pressure
606 606
607 byte 5:: 607 byte 5::
608 608
609 bit 7 6 5 4 3 2 1 0 609 bit 7 6 5 4 3 2 1 0
610 y7 y6 y5 y4 y3 y2 y1 y0 610 y7 y6 y5 y4 y3 y2 y1 y0
611 611
612 y11..y0 = absolute y value (vertical) 612 y11..y0 = absolute y value (vertical)
613 613
614 Two finger touch 614 Two finger touch
615 ^^^^^^^^^^^^^^^^ 615 ^^^^^^^^^^^^^^^^
616 616
617 The packet format is exactly the same for two 617 The packet format is exactly the same for two finger touch, except the hardware
618 sends two 6 byte packets. The first packet con 618 sends two 6 byte packets. The first packet contains data for the first finger,
619 the second packet has data for the second fing 619 the second packet has data for the second finger. So for two finger touch a
620 total of 12 bytes are sent. 620 total of 12 bytes are sent.
621 621
622 Hardware version 4 622 Hardware version 4
623 ~~~~~~~~~~~~~~~~~~ 623 ~~~~~~~~~~~~~~~~~~
624 624
625 Registers 625 Registers
626 --------- 626 ---------
627 627
628 * reg_07:: 628 * reg_07::
629 629
630 bit 7 6 5 4 3 2 1 0 630 bit 7 6 5 4 3 2 1 0
631 0 0 0 0 0 0 0 A 631 0 0 0 0 0 0 0 A
632 632
633 A: 1 = enable absolute tracking 633 A: 1 = enable absolute tracking
634 634
635 Native absolute mode 6 byte packet format 635 Native absolute mode 6 byte packet format
636 ----------------------------------------- 636 -----------------------------------------
637 637
638 v4 hardware is a true multitouch touchpad, cap 638 v4 hardware is a true multitouch touchpad, capable of tracking up to 5 fingers.
639 Unfortunately, due to PS/2's limited bandwidth 639 Unfortunately, due to PS/2's limited bandwidth, its packet format is rather
640 complex. 640 complex.
641 641
642 Whenever the numbers or identities of the fing 642 Whenever the numbers or identities of the fingers changes, the hardware sends a
643 status packet to indicate how many and which f 643 status packet to indicate how many and which fingers is on touchpad, followed by
644 head packets or motion packets. A head packet 644 head packets or motion packets. A head packet contains data of finger id, finger
645 position (absolute x, y values), width, and pr 645 position (absolute x, y values), width, and pressure. A motion packet contains
646 two fingers' position delta. 646 two fingers' position delta.
647 647
648 For example, when status packet tells there ar 648 For example, when status packet tells there are 2 fingers on touchpad, then we
649 can expect two following head packets. If the 649 can expect two following head packets. If the finger status doesn't change,
650 the following packets would be motion packets, 650 the following packets would be motion packets, only sending delta of finger
651 position, until we receive a status packet. 651 position, until we receive a status packet.
652 652
653 One exception is one finger touch. when a stat 653 One exception is one finger touch. when a status packet tells us there is only
654 one finger, the hardware would just send head 654 one finger, the hardware would just send head packets afterwards.
655 655
656 Status packet 656 Status packet
657 ^^^^^^^^^^^^^ 657 ^^^^^^^^^^^^^
658 658
659 byte 0:: 659 byte 0::
660 660
661 bit 7 6 5 4 3 2 1 0 661 bit 7 6 5 4 3 2 1 0
662 . . . . 0 1 R L 662 . . . . 0 1 R L
663 663
664 L, R = 1 when Left, Right mouse butto 664 L, R = 1 when Left, Right mouse button pressed
665 665
666 byte 1:: 666 byte 1::
667 667
668 bit 7 6 5 4 3 2 1 0 668 bit 7 6 5 4 3 2 1 0
669 . . . ft4 ft3 ft2 ft1 ft0 669 . . . ft4 ft3 ft2 ft1 ft0
670 670
671 ft4 ft3 ft2 ft1 ft0 ftn = 1 when fing 671 ft4 ft3 ft2 ft1 ft0 ftn = 1 when finger n is on touchpad
672 672
673 byte 2:: 673 byte 2::
674 674
675 not used 675 not used
676 676
677 byte 3:: 677 byte 3::
678 678
679 bit 7 6 5 4 3 2 1 0 679 bit 7 6 5 4 3 2 1 0
680 . . . 1 0 0 0 0 680 . . . 1 0 0 0 0
681 681
682 constant bits 682 constant bits
683 683
684 byte 4:: 684 byte 4::
685 685
686 bit 7 6 5 4 3 2 1 0 686 bit 7 6 5 4 3 2 1 0
687 p . . . . . . . 687 p . . . . . . .
688 688
689 p = 1 for palm 689 p = 1 for palm
690 690
691 byte 5:: 691 byte 5::
692 692
693 not used 693 not used
694 694
695 Head packet 695 Head packet
696 ^^^^^^^^^^^ 696 ^^^^^^^^^^^
697 697
698 byte 0:: 698 byte 0::
699 699
700 bit 7 6 5 4 3 2 1 0 700 bit 7 6 5 4 3 2 1 0
701 w3 w2 w1 w0 0 1 R L 701 w3 w2 w1 w0 0 1 R L
702 702
703 L, R = 1 when Left, Right mouse button 703 L, R = 1 when Left, Right mouse button pressed
704 w3..w0 = finger width (spans how many 704 w3..w0 = finger width (spans how many trace lines)
705 705
706 byte 1:: 706 byte 1::
707 707
708 bit 7 6 5 4 3 2 1 0 708 bit 7 6 5 4 3 2 1 0
709 p7 p6 p5 p4 x11 x10 x9 x8 709 p7 p6 p5 p4 x11 x10 x9 x8
710 710
711 byte 2:: 711 byte 2::
712 712
713 bit 7 6 5 4 3 2 1 0 713 bit 7 6 5 4 3 2 1 0
714 x7 x6 x5 x4 x3 x2 x1 x0 714 x7 x6 x5 x4 x3 x2 x1 x0
715 715
716 x11..x0 = absolute x value (horizontal 716 x11..x0 = absolute x value (horizontal)
717 717
718 byte 3:: 718 byte 3::
719 719
720 bit 7 6 5 4 3 2 1 0 720 bit 7 6 5 4 3 2 1 0
721 id2 id1 id0 1 0 0 0 1 721 id2 id1 id0 1 0 0 0 1
722 722
723 id2..id0 = finger id 723 id2..id0 = finger id
724 724
725 byte 4:: 725 byte 4::
726 726
727 bit 7 6 5 4 3 2 1 0 727 bit 7 6 5 4 3 2 1 0
728 p3 p1 p2 p0 y11 y10 y9 y8 728 p3 p1 p2 p0 y11 y10 y9 y8
729 729
730 p7..p0 = pressure 730 p7..p0 = pressure
731 731
732 byte 5:: 732 byte 5::
733 733
734 bit 7 6 5 4 3 2 1 0 734 bit 7 6 5 4 3 2 1 0
735 y7 y6 y5 y4 y3 y2 y1 y0 735 y7 y6 y5 y4 y3 y2 y1 y0
736 736
737 y11..y0 = absolute y value (vertical) 737 y11..y0 = absolute y value (vertical)
738 738
739 Motion packet 739 Motion packet
740 ^^^^^^^^^^^^^ 740 ^^^^^^^^^^^^^
741 741
742 byte 0:: 742 byte 0::
743 743
744 bit 7 6 5 4 3 2 1 0 744 bit 7 6 5 4 3 2 1 0
745 id2 id1 id0 w 0 1 R L 745 id2 id1 id0 w 0 1 R L
746 746
747 L, R = 1 when Left, Right mouse button 747 L, R = 1 when Left, Right mouse button pressed
748 id2..id0 = finger id 748 id2..id0 = finger id
749 w = 1 when delta overflows (> 127 or < 749 w = 1 when delta overflows (> 127 or < -128), in this case
750 firmware sends us (delta x / 5) and (de 750 firmware sends us (delta x / 5) and (delta y / 5)
751 751
752 byte 1:: 752 byte 1::
753 753
754 bit 7 6 5 4 3 2 1 0 754 bit 7 6 5 4 3 2 1 0
755 x7 x6 x5 x4 x3 x2 x1 x0 755 x7 x6 x5 x4 x3 x2 x1 x0
756 756
757 x7..x0 = delta x (two's complement) 757 x7..x0 = delta x (two's complement)
758 758
759 byte 2:: 759 byte 2::
760 760
761 bit 7 6 5 4 3 2 1 0 761 bit 7 6 5 4 3 2 1 0
762 y7 y6 y5 y4 y3 y2 y1 y0 762 y7 y6 y5 y4 y3 y2 y1 y0
763 763
764 y7..y0 = delta y (two's complement) 764 y7..y0 = delta y (two's complement)
765 765
766 byte 3:: 766 byte 3::
767 767
768 bit 7 6 5 4 3 2 1 0 768 bit 7 6 5 4 3 2 1 0
769 id2 id1 id0 1 0 0 1 0 769 id2 id1 id0 1 0 0 1 0
770 770
771 id2..id0 = finger id 771 id2..id0 = finger id
772 772
773 byte 4:: 773 byte 4::
774 774
775 bit 7 6 5 4 3 2 1 0 775 bit 7 6 5 4 3 2 1 0
776 x7 x6 x5 x4 x3 x2 x1 x0 776 x7 x6 x5 x4 x3 x2 x1 x0
777 777
778 x7..x0 = delta x (two's complement) 778 x7..x0 = delta x (two's complement)
779 779
780 byte 5:: 780 byte 5::
781 781
782 bit 7 6 5 4 3 2 1 0 782 bit 7 6 5 4 3 2 1 0
783 y7 y6 y5 y4 y3 y2 y1 y0 783 y7 y6 y5 y4 y3 y2 y1 y0
784 784
785 y7..y0 = delta y (two's complement) 785 y7..y0 = delta y (two's complement)
786 786
787 byte 0 ~ 2 for one finger 787 byte 0 ~ 2 for one finger
788 byte 3 ~ 5 for another 788 byte 3 ~ 5 for another
789 789
790 790
791 Trackpoint (for Hardware version 3 and 4) 791 Trackpoint (for Hardware version 3 and 4)
792 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 792 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
793 793
794 Registers 794 Registers
795 --------- 795 ---------
796 796
797 No special registers have been identified. 797 No special registers have been identified.
798 798
799 Native relative mode 6 byte packet format 799 Native relative mode 6 byte packet format
800 ----------------------------------------- 800 -----------------------------------------
801 801
802 Status Packet 802 Status Packet
803 ^^^^^^^^^^^^^ 803 ^^^^^^^^^^^^^
804 804
805 byte 0:: 805 byte 0::
806 806
807 bit 7 6 5 4 3 2 1 0 807 bit 7 6 5 4 3 2 1 0
808 0 0 sx sy 0 M R L 808 0 0 sx sy 0 M R L
809 809
810 byte 1:: 810 byte 1::
811 811
812 bit 7 6 5 4 3 2 1 0 812 bit 7 6 5 4 3 2 1 0
813 ~sx 0 0 0 0 0 0 0 813 ~sx 0 0 0 0 0 0 0
814 814
815 byte 2:: 815 byte 2::
816 816
817 bit 7 6 5 4 3 2 1 0 817 bit 7 6 5 4 3 2 1 0
818 ~sy 0 0 0 0 0 0 0 818 ~sy 0 0 0 0 0 0 0
819 819
820 byte 3:: 820 byte 3::
821 821
822 bit 7 6 5 4 3 2 1 0 822 bit 7 6 5 4 3 2 1 0
823 0 0 ~sy ~sx 0 1 1 0 823 0 0 ~sy ~sx 0 1 1 0
824 824
825 byte 4:: 825 byte 4::
826 826
827 bit 7 6 5 4 3 2 1 0 827 bit 7 6 5 4 3 2 1 0
828 x7 x6 x5 x4 x3 x2 x1 x0 828 x7 x6 x5 x4 x3 x2 x1 x0
829 829
830 byte 5:: 830 byte 5::
831 831
832 bit 7 6 5 4 3 2 1 0 832 bit 7 6 5 4 3 2 1 0
833 y7 y6 y5 y4 y3 y2 y1 y0 833 y7 y6 y5 y4 y3 y2 y1 y0
834 834
835 835
836 x and y are written in two's compleme 836 x and y are written in two's complement spread
837 over 9 bits with sx/sy the relati 837 over 9 bits with sx/sy the relative top bit and
838 x7..x0 and y7..y0 the lower bits. 838 x7..x0 and y7..y0 the lower bits.
839 ~sx is the inverse of sx, ~sy is the 839 ~sx is the inverse of sx, ~sy is the inverse of sy.
840 The sign of y is opposite to what the 840 The sign of y is opposite to what the input driver
841 expects for a relative movement 841 expects for a relative movement
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