PCA953x I/O ports

modulename: pca953x.ko

and/or

gpio-pca953x.ko

configname: CONFIG_GPIO_PCA953X

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>I2C support
└─>PCA953x I/O ports
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Say yes here to support the PCA9534 (8-bit), PCA9535 (16-bit),
PCA9536 (4-bit), PCA9537 (4-bit), PCA9538 (8-bit), and PCA9539
(16-bit) I/O ports. These parts are made by NXP and TI.

This driver can also be built as a module. If so, the module
will be called pca953x.

source code: