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Diffstat (limited to 'Documentation/input/elantech.txt')
| -rw-r--r-- | Documentation/input/elantech.txt | 295 |
1 files changed, 279 insertions, 16 deletions
diff --git a/Documentation/input/elantech.txt b/Documentation/input/elantech.txt index db798af5ef98..5602eb71ad5d 100644 --- a/Documentation/input/elantech.txt +++ b/Documentation/input/elantech.txt @@ -16,15 +16,28 @@ Contents 1. Introduction 2. Extra knobs - 3. Hardware version 1 - 3.1 Registers - 3.2 Native relative mode 4 byte packet format - 3.3 Native absolute mode 4 byte packet format - 4. Hardware version 2 + 3. Differentiating hardware versions + 4. Hardware version 1 4.1 Registers - 4.2 Native absolute mode 6 byte packet format - 4.2.1 One finger touch - 4.2.2 Two finger touch + 4.2 Native relative mode 4 byte packet format + 4.3 Native absolute mode 4 byte packet format + 5. Hardware version 2 + 5.1 Registers + 5.2 Native absolute mode 6 byte packet format + 5.2.1 Parity checking and packet re-synchronization + 5.2.2 One/Three finger touch + 5.2.3 Two finger touch + 6. Hardware version 3 + 6.1 Registers + 6.2 Native absolute mode 6 byte packet format + 6.2.1 One/Three finger touch + 6.2.2 Two finger touch + 7. Hardware version 4 + 7.1 Registers + 7.2 Native absolute mode 6 byte packet format + 7.2.1 Status packet + 7.2.2 Head packet + 7.2.3 Motion packet @@ -375,7 +388,7 @@ For all the other ones, there are just a few constant bits: In case an error is detected, all the packets are shifted by one (and packet[0] is discarded). -5.2.1 One/Three finger touch +5.2.2 One/Three finger touch ~~~~~~~~~~~~~~~~ byte 0: @@ -384,19 +397,19 @@ byte 0: n1 n0 w3 w2 . . R L L, R = 1 when Left, Right mouse button pressed - n1..n0 = numbers of fingers on touchpad + n1..n0 = number of fingers on touchpad byte 1: bit 7 6 5 4 3 2 1 0 - p7 p6 p5 p4 . x10 x9 x8 + p7 p6 p5 p4 x11 x10 x9 x8 byte 2: bit 7 6 5 4 3 2 1 0 x7 x6 x5 x4 x3 x2 x1 x0 - x10..x0 = absolute x value (horizontal) + x11..x0 = absolute x value (horizontal) byte 3: @@ -420,7 +433,7 @@ byte 3: byte 4: bit 7 6 5 4 3 2 1 0 - p3 p1 p2 p0 . . y9 y8 + p3 p1 p2 p0 y11 y10 y9 y8 p7..p0 = pressure (not EF113) @@ -429,10 +442,10 @@ byte 5: bit 7 6 5 4 3 2 1 0 y7 y6 y5 y4 y3 y2 y1 y0 - y9..y0 = absolute y value (vertical) + y11..y0 = absolute y value (vertical) -4.2.2 Two finger touch +5.2.3 Two finger touch ~~~~~~~~~~~~~~~~ Note that the two pairs of coordinates are not exactly the coordinates of the @@ -446,7 +459,7 @@ byte 0: n1 n0 ay8 ax8 . . R L L, R = 1 when Left, Right mouse button pressed - n1..n0 = numbers of fingers on touchpad + n1..n0 = number of fingers on touchpad byte 1: @@ -480,3 +493,253 @@ byte 5: by7 by8 by5 by4 by3 by2 by1 by0 by8..by0 = upper-right finger absolute y value + +///////////////////////////////////////////////////////////////////////////// + +6. Hardware version 3 + ================== + +6.1 Registers + ~~~~~~~~~ +* reg_10 + + bit 7 6 5 4 3 2 1 0 + 0 0 0 0 0 0 0 A + + A: 1 = enable absolute tracking + +6.2 Native absolute mode 6 byte packet format + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +1 and 3 finger touch shares the same 6-byte packet format, except that +3 finger touch only reports the position of the center of all three fingers. + +Firmware would send 12 bytes of data for 2 finger touch. + +Note on debounce: +In case the box has unstable power supply or other electricity issues, or +when number of finger changes, F/W would send "debounce packet" to inform +driver that the hardware is in debounce status. +The debouce packet has the following signature: + byte 0: 0xc4 + byte 1: 0xff + byte 2: 0xff + byte 3: 0x02 + byte 4: 0xff + byte 5: 0xff +When we encounter this kind of packet, we just ignore it. + +6.2.1 One/Three finger touch + ~~~~~~~~~~~~~~~~~~~~~~ + +byte 0: + + bit 7 6 5 4 3 2 1 0 + n1 n0 w3 w2 0 1 R L + + L, R = 1 when Left, Right mouse button pressed + n1..n0 = number of fingers on touchpad + +byte 1: + + bit 7 6 5 4 3 2 1 0 + p7 p6 p5 p4 x11 x10 x9 x8 + +byte 2: + + bit 7 6 5 4 3 2 1 0 + x7 x6 x5 x4 x3 x2 x1 x0 + + x11..x0 = absolute x value (horizontal) + +byte 3: + + bit 7 6 5 4 3 2 1 0 + 0 0 w1 w0 0 0 1 0 + + w3..w0 = width of the finger touch + +byte 4: + + bit 7 6 5 4 3 2 1 0 + p3 p1 p2 p0 y11 y10 y9 y8 + + p7..p0 = pressure + +byte 5: + + bit 7 6 5 4 3 2 1 0 + y7 y6 y5 y4 y3 y2 y1 y0 + + y11..y0 = absolute y value (vertical) + +6.2.2 Two finger touch + ~~~~~~~~~~~~~~~~ + +The packet format is exactly the same for two finger touch, except the hardware +sends two 6 byte packets. The first packet contains data for the first finger, +the second packet has data for the second finger. So for two finger touch a +total of 12 bytes are sent. + +///////////////////////////////////////////////////////////////////////////// + +7. Hardware version 4 + ================== + +7.1 Registers + ~~~~~~~~~ +* reg_07 + + bit 7 6 5 4 3 2 1 0 + 0 0 0 0 0 0 0 A + + A: 1 = enable absolute tracking + +7.2 Native absolute mode 6 byte packet format + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +v4 hardware is a true multitouch touchpad, capable of tracking up to 5 fingers. +Unfortunately, due to PS/2's limited bandwidth, its packet format is rather +complex. + +Whenever the numbers or identities of the fingers changes, the hardware sends a +status packet to indicate how many and which fingers is on touchpad, followed by +head packets or motion packets. A head packet contains data of finger id, finger +position (absolute x, y values), width, and pressure. A motion packet contains +two fingers' position delta. + +For example, when status packet tells there are 2 fingers on touchpad, then we +can expect two following head packets. If the finger status doesn't change, +the following packets would be motion packets, only sending delta of finger +position, until we receive a status packet. + +One exception is one finger touch. when a status packet tells us there is only +one finger, the hardware would just send head packets afterwards. + +7.2.1 Status packet + ~~~~~~~~~~~~~ + +byte 0: + + bit 7 6 5 4 3 2 1 0 + . . . . 0 1 R L + + L, R = 1 when Left, Right mouse button pressed + +byte 1: + + bit 7 6 5 4 3 2 1 0 + . . . ft4 ft3 ft2 ft1 ft0 + + ft4 ft3 ft2 ft1 ft0 ftn = 1 when finger n is on touchpad + +byte 2: not used + +byte 3: + + bit 7 6 5 4 3 2 1 0 + . . . 1 0 0 0 0 + + constant bits + +byte 4: + + bit 7 6 5 4 3 2 1 0 + p . . . . . . . + + p = 1 for palm + +byte 5: not used + +7.2.2 Head packet + ~~~~~~~~~~~ + +byte 0: + + bit 7 6 5 4 3 2 1 0 + w3 w2 w1 w0 0 1 R L + + L, R = 1 when Left, Right mouse button pressed + w3..w0 = finger width (spans how many trace lines) + +byte 1: + + bit 7 6 5 4 3 2 1 0 + p7 p6 p5 p4 x11 x10 x9 x8 + +byte 2: + + bit 7 6 5 4 3 2 1 0 + x7 x6 x5 x4 x3 x2 x1 x0 + + x11..x0 = absolute x value (horizontal) + +byte 3: + + bit 7 6 5 4 3 2 1 0 + id2 id1 id0 1 0 0 0 1 + + id2..id0 = finger id + +byte 4: + + bit 7 6 5 4 3 2 1 0 + p3 p1 p2 p0 y11 y10 y9 y8 + + p7..p0 = pressure + +byte 5: + + bit 7 6 5 4 3 2 1 0 + y7 y6 y5 y4 y3 y2 y1 y0 + + y11..y0 = absolute y value (vertical) + +7.2.3 Motion packet + ~~~~~~~~~~~~~ + +byte 0: + + bit 7 6 5 4 3 2 1 0 + id2 id1 id0 w 0 1 R L + + L, R = 1 when Left, Right mouse button pressed + id2..id0 = finger id + w = 1 when delta overflows (> 127 or < -128), in this case + firmware sends us (delta x / 5) and (delta y / 5) + +byte 1: + + bit 7 6 5 4 3 2 1 0 + x7 x6 x5 x4 x3 x2 x1 x0 + + x7..x0 = delta x (two's complement) + +byte 2: + + bit 7 6 5 4 3 2 1 0 + y7 y6 y5 y4 y3 y2 y1 y0 + + y7..y0 = delta y (two's complement) + +byte 3: + + bit 7 6 5 4 3 2 1 0 + id2 id1 id0 1 0 0 1 0 + + id2..id0 = finger id + +byte 4: + + bit 7 6 5 4 3 2 1 0 + x7 x6 x5 x4 x3 x2 x1 x0 + + x7..x0 = delta x (two's complement) + +byte 5: + + bit 7 6 5 4 3 2 1 0 + y7 y6 y5 y4 y3 y2 y1 y0 + + y7..y0 = delta y (two's complement) + + byte 0 ~ 2 for one finger + byte 3 ~ 5 for another |
