ATA_HOST_ALLOC_PINFO(9) libata Library ATA_HOST_ALLOC_PINFO(9)NAME
ata_host_alloc_pinfo - alloc host and init with port_info array
SYNOPSIS
struct ata_host * ata_host_alloc_pinfo(struct device * dev, const struct ata_port_info *const * ppi, int n_ports);
ARGUMENTS
dev
generic device this host is associated with
ppi
array of ATA port_info to initialize host with
n_ports
number of ATA ports attached to this host
DESCRIPTION
Allocate ATA host and initialize with info from ppi. If NULL terminated, ppi may contain fewer entries than n_ports. The last entry will be
used for the remaining ports.
RETURNS
Allocate ATA host on success, NULL on failure.
LOCKING
Inherited from calling layer (may sleep).
AUTHOR
Jeff Garzik
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 ATA_HOST_ALLOC_PINFO(9)
Check Out this Related Man Page
PPI(4) BSD Kernel Interfaces Manual PPI(4)NAME
ppi -- user-space interface to ppbus parallel 'geek' port
SYNOPSIS
device ppi
Minor numbering: unit numbers correspond directly to ppbus numbers.
#include <dev/ppbus/ppi.h>
#include <dev/ppbus/ppbconf.h>
DESCRIPTION
The ppi driver provides a convenient means for user applications to manipulate the state of the parallel port, enabling easy low-speed I/O
operations without the security problems inherent with the use of the /dev/io interface.
PROGRAMMING INTERFACE
All I/O on the ppi interface is performed using ioctl() calls. Each command takes a single u_int8_t argument, transferring one byte of data.
The following commands are available:
PPIGDATA, PPISDATA
Get and set the contents of the data register.
PPIGSTATUS, PPISSTATUS
Get and set the contents of the status register.
PPIGCTRL, PPISCTRL
Get and set the contents of the control register. The following defines correspond to bits in this register. Setting a bit in the
control register drives the corresponding output low.
STROBE
AUTOFEED
nINIT
SELECTIN
PCD
PPIGEPP, PPISEPP
Get and set the contents of the EPP control register.
PPIGECR, PPISECR
Get and set the contents of the ECP control register.
PPIGFIFO, PPISFIFO
Read and write the ECP FIFO (8-bit operations only).
EXAMPLES
To present the value 0x5a to the data port, drive STROBE low and then high again, the following code fragment can be used:
int fd;
u_int8_t val;
val = 0x5a;
ioctl(fd, PPISDATA, &val);
ioctl(fd, PPIGCTRL, &val);
val |= STROBE;
ioctl(fd, PPISCTRL, &val);
val &= ~STROBE;
ioctl(fd, PPISCTRL, &val);
BUGS
The inverse sense of signals is confusing.
The ioctl() interface is slow, and there is no way (yet) to chain multiple operations together.
The headers required for user applications are not installed as part of the standard system.
BSD January 2, 1998 BSD
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