Hello, everyone.
We are porting the Linux kernel to our PDA, Asus P525/P535. This device
has a pca9535 gpio extender. The keyboard is connected to it. The
extender has only one irq. At the moment, the pca9535 is handled by
pca953x gpio driver. We need to have the access to its registers from
our keyboard driver (so as not to read 13 gpios, but decode the register
containing gpio states). If i try to read each of these 13 gpios after
the interrupt from the extender comes, the kernel crashes. Is there a
solution to read i2c client addresses when there is a client registered
already?
http://www.kaa.org.ua/asus-p535/hardware.html
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