Touchpad on Dell Latitude XT (alps 73 00 14)

Touchpad on Dell Latitude XT (alps 73 00 14)

[Rafi Rubin]

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My touchpad has the id 73,00,14 which I added to alps.c as
{ { 0x73, 0x00, 0x14 }, 0xf8, 0xf8, 0 }

How can I determine what values to use for those last three fields?

Rafi
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Re: Touchpad on Dell Latitude XT (alps 73 00 14)

[Dmitry Torokhov]

Hi Rafi,

On Fri, Jan 09, 2009 at 06:51:51PM -0500, Rafi Rubin wrote:
> 
> My touchpad has the id 73,00,14 which I added to alps.c as
> { { 0x73, 0x00, 0x14 }, 0xf8, 0xf8, 0 }
> 
> How can I determine what values to use for those last three fields?
> 

f your touchpad works (you don't see any messages from psmouse in dmesg
and every button works fine) then these are correct values.

-- 
Dmitry

Re: Touchpad on Dell Latitude XT (alps 73 00 14)

[Rafi Rubin]

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Dmitry Torokhov wrote:
> Hi Rafi,
> 
> On Fri, Jan 09, 2009 at 06:51:51PM -0500, Rafi Rubin wrote:
>> My touchpad has the id 73,00,14 which I added to alps.c as
>> { { 0x73, 0x00, 0x14 }, 0xf8, 0xf8, 0 }
>>
>> How can I determine what values to use for those last three fields?
>>
> 
> f your touchpad works (you don't see any messages from psmouse in dmesg
> and every button works fine) then these are correct values.
> 

Its not working quite right.  When I add the device and give it the "ALPS_DUALPOINT" flag (or 0), I get all the touchpad events working properly (through the synaptics driver in X).  But the stick is
sending weird coordinates through the mouse driver and extraneous clicks through the synaptics driver.

The ALPS_PASS flag just seems to send all the touchpad events to the mouse, and looses all stick events.

I'm not getting psmouse messages from the kernel when its in use.  But then again, I'm not really using it all that much.  The load time tests report:

alps.c: E6 report: 00 00 64
alps.c: E7 report: 73 00 14
alps.c: Status: 73 00 14



On a side note, seems to me the E6 test should print in decimal, or the comment saying the third value should be 10 or 100 should be changed to hex values.


Rafi
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Re: Touchpad on Dell Latitude XT (alps 73 00 14)

[Rafi Rubin]

>> { { 0x73, 0x00, 0x14 }, 0xf8, 0xf8, 0 }
>>
>> How can I determine what values to use for those last three fields?
>>
> 
> f your touchpad works (you don't see any messages from psmouse in dmesg
> and every button works fine) then these are correct values.

I took another look at it and would appreciate a little more advice.

First off, it seems that regardless of which flags I use (except for
ALPS_PASS), the first byte is 0xff for all packets.  So those masks
don't seem to do anything useful for my device.

The touchpad does work fine.  And with ALPS_DUALPOINT, packet[5] always
comes out as 127.  However those 4 bytes in the middle act a little
weird.  It looks to me like they are just rotating as if the packet size
is incorrect.

[ 1325.709029] alps packet: ff 02 00 00 08 7f
[ 1325.722834] alps packet: ff 00 08 02 02 7f
[ 1325.737028] alps packet: ff 08 02 00 00 7f
[ 1325.760152] alps packet: ff 01 00 00 08 7f
[ 1325.773963] alps packet: ff 00 08 01 00 7f
[ 1325.824228] alps packet: ff 00 01 00 08 7f
[ 1325.838144] alps packet: ff 01 08 00 00 7f



Where do the first and last bytes come from?  Are they being sent by the
device, or added by a driver?

Any thoughts?

Rafi