PARPORT_YIELD(9) Parallel Port Devices PARPORT_YIELD(9)NAME
parport_yield - relinquish a parallel port temporarily
int parport_yield(struct pardevice * dev);
a device on the parallel port
This function relinquishes the port if it would be helpful to other drivers to do so. Afterwards it tries to reclaim the port using
parport_claim, and the return value is the same as for parport_claim. If it fails, the port is left unclaimed and it is the driver's
responsibility to reclaim the port.
The parport_yield and parport_yield_blocking functions are for marking points in the driver at which other drivers may claim the port and
use their devices. Yielding the port is similar to releasing it and reclaiming it, but is more efficient because no action is taken if
there are no other devices needing the port. In fact, nothing is done even if there are other devices waiting but the current device is
still within its "timeslice". The default timeslice is half a second, but it can be adjusted via the /proc interface.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 PARPORT_YIELD(9)
Check Out this Related Man Page
PARPORT_REGISTER_POR(9) Parallel Port Devices PARPORT_REGISTER_POR(9)NAME
parport_register_port - register a parallel port
struct parport * parport_register_port(unsigned long base, int irq, int dma, struct parport_operations * ops);
base I/O address
pointer to the port driver's port operations structure
When a parallel port (lowlevel) driver finds a port that should be made available to parallel port device drivers, it should call
parport_register_port. The base, irq, and dma parameters are for the convenience of port drivers, and for ports where they aren't
meaningful needn't be set to anything special. They can be altered afterwards by adjusting the relevant members of the parport structure
that is returned and represents the port. They should not be tampered with after calling parport_announce_port, however.
If there are parallel port device drivers in the system that have registered themselves using parport_register_driver, they are not told
about the port at this time; that is done by parport_announce_port.
The ops structure is allocated by the caller, and must not be deallocated before calling parport_remove_port.
If there is no memory to allocate a new parport structure, this function will return NULL.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 PARPORT_REGISTER_POR(9)
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