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struct GPIO_ioctl {
// This is used for general input and output in the same ioctl.
// inlen is replaced by the number of input bytes consumed.
// inlen is always even and represents a number of pairs:
// [0/1/2,value]: write value to port_base+0/1/2.
// [0x80/0x81/0x82, --]: read value from port_base+0/1/2
// and append result to outbuf.
// Thus one can intermix read and write in the same ioctl.
unsigned inlen; char *inbuf;
// outlen is replaced by # of output bytes written.
unsigned outlen; char *outbuf;
};
// IO control numbers
// Linux kernel uses 0x54XX for special purposes. Avoid such.
// We'll pick large numbers.
// We don't use the linux convention of dividing the IOC into a bunch
// of bit fields. We can always switch to this later, as the
// IOC 0 returns the driver version (which IOC value will never change).
#define GPIO_IOC_VERSION 0 // returns version
#define GPIO_IOC_BASE 0xaa3a0000 // Intended for use on ARCangel 3!
// Switch base address of parallel port. 0x3f8 is assumed.
// WARNING! You can write on any port whatsoever with this driver.
// BE CAREFUL!
#define GPIO_IOC_SET_PORT_BASE (GPIO_IOC_BASE+1) // cmd, arg=port base
// General input/output ioctl. See GPIO_ioctl struct.
#define GPIO_IOC_DO_IO (GPIO_IOC_BASE+2) // cmd, arg=GPIO_ioctl *
// For emergency purposes in case the driver is goofed up.
#define GPIO_IOC_HARDRESET (GPIO_IOC_BASE+3) // cmd, no arg
// Do you have an antiquated parallel port? You might need to ask
// the driver to use outb_p and inb_p (_p = pause). Default is not to.
#define GPIO_IOC_SET_PAUSE (GPIO_IOC_BASE+4) // arg = 1 => use pause; o/wise not.
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