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// Copyright (C) 2009 Jeff Epler
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef HAL_PARPORT_COMMON_H
#define HAL_PARPORT_COMMON_H
#include <linux/parport.h>
typedef struct hal_parport_t
{
unsigned short base;
unsigned short base_hi;
struct pardevice *linux_dev;
void *region;
void *region_hi;
} hal_parport_t;
static int
hal_parport_get(int comp_id, hal_parport_t *port,
unsigned short base, unsigned short base_hi, unsigned int modes)
{
int retval = 0;
struct parport *linux_port = 0;
memset(port, 0, sizeof(hal_parport_t));
// I/O addresses 1..16 are assumed to be linux parport numbers
if(base < 16) {
linux_port = parport_find_number(base);
if(!linux_port)
{
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: linux parport %d not found\n",
base);
return -ENODEV;
}
} else {
linux_port = parport_find_base(base);
}
if(linux_port)
{
if((modes & linux_port->modes) != modes)
{
rtapi_print_msg(RTAPI_MSG_WARN,
"PARPORT: linux parport %s does not support mode %x.\n"
"PARPORT: continuing anyway.\n",
linux_port->name, modes);
}
rtapi_print_msg(RTAPI_MSG_INFO,
"PARPORT: Using Linux parport %s at ioaddr=0x%lx:0x%lx\n",
linux_port->name, linux_port->base, linux_port->base_hi);
port->linux_dev = parport_register_device(linux_port,
hal_comp_name(comp_id), NULL, NULL, NULL, 0, NULL);
if(!port->linux_dev)
{
parport_put_port(linux_port);
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: port %s register failed\n", linux_port->name);
return -EIO;
}
retval = parport_claim(port->linux_dev);
if(retval < 0)
{
parport_put_port(linux_port);
parport_unregister_device(port->linux_dev);
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: port %s claim failed\n", linux_port->name);
return retval;
}
port->base = linux_port->base;
if(linux_port->base_hi > 0) {
port->base_hi = linux_port->base_hi;
} else if(base_hi != (unsigned short)-1) {
if(base_hi == 0) base_hi = port->base + 0x400;
rtapi_print_msg(RTAPI_MSG_DBG,
"PARPORT: DEBUG: linux reports no ioaddr_hi, using 0x%x",
base_hi);
port->region_hi =
rtapi_request_region(base_hi, 3, hal_comp_name(comp_id));
if(port->region_hi) {
rtapi_print_msg(RTAPI_MSG_DBG,
"PARPORT: DEBUG: got requested region starting at 0x%x",
base_hi);
port->base_hi = base_hi;
} else {
rtapi_print_msg(RTAPI_MSG_DBG,
"PARPORT: DEBUG: did not get requested region starting at 0x%x",
base_hi);
}
}
parport_put_port(linux_port);
} else {
if(base_hi == 0) base_hi = base + 0x400;
port->base = base;
rtapi_print_msg(RTAPI_MSG_INFO,
"Using direct parport at ioaddr=0x%x:0x%x\n", base, base_hi);
// SPP access needs only 3 bytes, but EPP needs 8. Allocating 8
// is likely to always be OK, and it simplifies things (since the
// exact allocation size is also needed at deallocation).
port->region = rtapi_request_region(base, 8, hal_comp_name(comp_id));
if(!port->region)
{
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: request_region(0x%x) failed\n", base);
return -EBUSY;
}
if(base_hi != (unsigned short)-1)
{
port->base_hi = base_hi;
port->region_hi =
rtapi_request_region(base_hi, 3, hal_comp_name(comp_id));
if(!port->region_hi)
{
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: request_region(0x%x) failed\n", base_hi);
rtapi_release_region(port->base, 8);
return -EBUSY;
}
}
}
return 0;
}
void hal_parport_release(hal_parport_t *port)
{
if(port->linux_dev)
{
rtapi_print_msg(RTAPI_MSG_INFO,
"PARPORT: Releasing Linux parport at ioaddr=0x%lx:0x%lx\n",
port->linux_dev->port->base, port->linux_dev->port->base_hi);
parport_release(port->linux_dev);
parport_unregister_device(port->linux_dev);
}
if(port->region) {
rtapi_print_msg(RTAPI_MSG_INFO,
"PARPORT: Releasing I/O region ioaddr=0x%x\n", port->base);
rtapi_release_region(port->base, 8);
}
if(port->region_hi) {
rtapi_print_msg(RTAPI_MSG_INFO,
"PARPORT: Releasing high I/O region ioaddr=0x%x\n",
port->base_hi);
rtapi_release_region(port->base_hi, 3);
}
memset(port, 0, sizeof(hal_parport_t));
}
#endif
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