Hi, > I had a preliminary discussion with Benjamin Tissoires and according to > our agreement I repost it for wider audience. > Blacklisting the device was decided to be a bad idea. > But actually I managed to get touchpad totally operational via SMBus > using a following hack: > > providing a parameter to i2c_i801 driver: > > modprobe i2c_i801 disable_features=0x2 (i.e. disable the block buffer). So, from an I2C perspective, there are two things to mention here: a) I am in the process of extending the I2C core to allow block transfers > 32 byte. This is a slow process, though, because we need to pay attention to not break userspace ABI. If this is done *and* the i801 driver supports length > 32 bytes, too, then it would work natively. If the i801 can do this, this is a question for Jean Delvare. b) I don't know Elantech HW but there are devices out there which allow configuration for the block size. Something like a bit specifying if block transfers > 32 are allowed. Or the SMBus version to support. Block transfers > 32 are SMBus 3.0+ only. If your HW does not have that, disabling SMBus is an option, too. Disabling it in the i801 driver is too much of a hammer, I'd say. Hope this helps! Happy hacking, Wolfram
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