Linux User and kernel space access to the AT91 GPIO registers

Linux users and kernel space access the AT91 GPIO registers-general Linux technology-Linux programming and kernel information. The following is a detailed description. Kernel space:
Linux-2.6.24 kernel I use
# Include

Get the register value
At91_get_gpio_value (AT91_PIN_PAXX );

Set register value
At91_set_gpio_value (AT91_PIN_PAXX, val );

There are several other functions to set input and output.

User space:
The user space cannot directly access the registers and needs to be accessed through the driver.

Some driver code

Add ioctl call to the driver:

QUOTE: