On Jan 04 2017 or thereabouts, Andy Shevchenko wrote: > On Tue, Jan 3, 2017 at 10:39 PM, Pali Rohár <pali.rohar@xxxxxxxxx> wrote: > > > > With Michał we already discussed about it, see emails. Basically you can > > enable/disable kernel modules at compile time or blacklist at runtime > > (or even chose what will be compiled into vmlinux and what as external > > .ko module). Some distributions blacklist i2c-i801.ko module... > > But you understand that any of compile/not compile is not an option, right? > The case which we face will be both of them, if possible, will be > compiled as modules. > > Blacklisting means making your problem the actual user's one. Not good. > > > And > > there can be also problem with initialization of i2c-i801 driver (fix is > > in commit a7ae81952cda, but does not have to work at every time!). So > > that move on whitelisted machines can potentially cause disappearance of > > /dev/freefall and users will not have hdd protection which is currently > > working. > I am seeing the same issues with psmouse and SMBus touchpads. The PS/2 device knows about the availability of a better but unlisted device at the ACPI level. The way I solved this to not have to deal with compile/not compile and runtime errors is the same way Wolfram told you about: bus notifiers. I also use an intermediate platform driver to not add i2c dependency on psmouse. For you the solution would be: - In dell-smo8800, after checking the whitelist, add a platform driver "dell-lis3lv02d-platform", and add in the platform_data the I2C address of the chip. - create a new driver dell-lis3lv02d-platform.ko which listens for the i2c bus creation and registers the lis3lv02d I2C node when it sees a matching adapter. (see [1] for my solution) - in dell-lis3lv02d-platform.ko make sure to set the irq to -ENOENT so that lis3lv02d.ko doesn't create /dev/freefall which will still be handled by ACPI. How does that sound? Cheers, Benjamin [1] https://github.com/bentiss/linux/blob/synaptics-rmi4-v4.9-rc7+/drivers/input/rmi4/rmi_platform.c -- 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
