Hi! Now I find on cirque website that there is some documentation for GlidePoint/ALPS touchpads/trackpads. The most interesting part is "GP-AN- 130823 INTERFACING TO GEN4 OVER I2C (PDF)" on website: http://www.cirque.com/gen4-dev-resources There is basic I2C and HID protocol information with Memory Table registers in section 7. Looking at mouse/alps.c and hid/hid-alps.c source code, it seems that those 0xC2C0 and other "random" numbers have real meaning. And it should be possible to set more configuration options for ALPS touchpads. There are some coordinate algorithms or configuration for sample rate, etc. PS/2 protocol description is completely missing in that documentation, but e.g. addresses passed to PS/2 function alps_command_mode_read_reg() perfectly matches addresses in above memory table (e.g. AuxDevicePresent = enable/disable trackstick, etc...). I have not know that there is released such documentation for ALPS devices, so I'm sending this email... maybe it can be useful for you too. On that page is also documentation with source code examples how to update firmware in touchpads. -- Pali Rohár pali.rohar@xxxxxxxxx
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