Hi, I am currently working on the Synaptics touchpads that can be found on many Lenovo laptops. These touchpads are capable of talking over the PS/2 bus but also over SMBus. The PS/2 bus is somewhat limited in what it allows to do and using the SMBus protocol would allow us to be close to what the Windows driver implements (and thus benefit from the firmware QA that is made for this system). The current WIP is posted here: https://github.com/bentiss/linux branch synaptics-rmi4-smbus-v4.1-15-06-23 We are still missing a few bits here and there to actually switch the default to this driver (PS/2 pass-through for example), so I am splitting the series in the hope of receiving feedbacks earlier. The Synaptics touchpads are using the SMBus Host Notification feature which an implementation is proposed in this series. I am not sure if the Host Notification feature can be emulated by all controllers so I based my work on what is available on the i801 PCH: an hardware feature introduced in ICH 3. Any comments welcome! Cheers, Benjamin Benjamin Tissoires (2): i2c: add SMBus Host Notify support i2c: i801: add support of Host Notify Documentation/i2c/smbus-protocol | 4 + drivers/i2c/busses/i2c-i801.c | 223 +++++++++++++++++++++++++++++++-------- drivers/i2c/i2c-core.c | 60 +++++++++++ drivers/i2c/i2c-smbus.c | 17 +-- include/linux/i2c.h | 11 ++ include/uapi/linux/i2c.h | 1 + 6 files changed, 256 insertions(+), 60 deletions(-) -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
