Maxim Integrated 73M1822/73M1922 Control Module - Manual (Page 54)

73M1822/73M1922 Control Module User Guide UG_1x22_053
54 Rev. 1.0
6.7.3 M1X22_GPIO_DATA
Description
This IOCTL is used to read or write data from and to the GPIO pin.
#define M1X22_GPIO_DATA _IOWR(0xA4, 0xC2, unsigned int)
Prototype
int ioctl (
int chan_fd,
int M1X22_GPIO_DATA,
unsigned long param );
Parameters
Data Type Name Description
int chan_fd Channel descriptor.
int M1X22_GPIO_DATA I/O control identifier for this operation.
unsigned long param Pointer to the M1X22_GPIO_DATA_t structure.
Return Values
Data Type Description
unsigned int 0 – Successful.
-1 – Failed to access GPIO data.