Comment # 16 on bug 1193064 from Artyom

(In reply to Takashi Iwai from comment #15)
> How about rebinding?
> 
> echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid/unbind
> echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid/bind
> 
> You can try the above while the touchpad is working, and verify that the
> first call stops the touchpad and the second restores.  If that works, try
> the same after the resume.  It might be a different file name than i2c_hid
> on the recent system, so check the path beforehand.  (e.g. on my 5.16-rc
> kernel, it's i2c_hid_acpi).

bash: /sys/bus/i2c/drivers/i2c_hid/unbind: No such file or directory


localhost:/ # echo -n "i2c-ELAN0000:00" >
/sys/bus/i2c/drivers/i2c_hid_acpi/unbind 
localhost:/ # echo -n "i2c-ELAN0000:00" >
/sys/bus/i2c/drivers/i2c_hid_acpi/bind 

(In reply to Takashi Iwai from comment #15)
> How about rebinding?
> 
> echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid/unbind
> echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid/bind
> 
> You can try the above while the touchpad is working, and verify that the
> first call stops the touchpad and the second restores.  If that works, try
> the same after the resume.  It might be a different file name than i2c_hid
> on the recent system, so check the path beforehand.  (e.g. on my 5.16-rc
> kernel, it's i2c_hid_acpi).

When touchpad is working (blacklisted elan)
echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid_acpi/unbind
Disables 
echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid_acpi/bind
Restores
(on my 5.15.3 kernel, it's i2c_hid_acpi too)

When touchpad is not working (delete blacklist)
localhost:/ # echo -n "i2c-ELAN0000:00" >
/sys/bus/i2c/drivers/i2c_hid_acpi/unbind 
bash: echo: write error: No such device
localhost:/ # echo -n "i2c-ELAN0000:00" >
/sys/bus/i2c/drivers/i2c_hid_acpi/bind 
bash: echo: write error: Device or resource busy