MAX7319, MAX7320-7327 I2C Port Expanders

modulename: max732x.ko

and/or

gpio-max732x.ko

configname: CONFIG_GPIO_MAX732X

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>I2C support
└─>MAX7319, MAX7320-7327 I2C Port Expanders
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Say yes here to support the MAX7319, MAX7320-7327 series of I2C
Port Expanders. Each IO port on these chips has a fixed role of
Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
Input and Output (designed by 'P'). The combinations are listed
below:

8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
max7322 (4I4O), max7323 (4P4O)

16 bits: max7324 (8I8O), max7325 (8P8O),
max7326 (4I12O), max7327 (4P12O)

Board setup code must specify the model to use, and the start
number for these GPIOs.

source code: