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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
#ifdef SIM
// drop root privilegs after init
// this is a stopgap measure until rtapi_app knows how to handle this
#define DROP_PRIV 1
#define MAX_PARPORT 10 // a tad on the high side
struct ppres {
unsigned int state;
unsigned int reg_start;
unsigned int reg_end;
unsigned int irq;
};
#else
#include <linux/parport.h>
#endif
typedef struct hal_parport_t
{
unsigned short base;
unsigned short base_hi;
#ifndef SIM
struct pardevice *linux_dev;
#else
struct ppres pp_res; // retrieved from sysfs
int parport_fd; // for ioctl()
#endif
void *region;
void *region_hi;
} hal_parport_t;
#ifdef SIM
float cpu_MHz(void)
{
char *path = "/proc/cpuinfo", *s, line[1024];
float freq;
char *cpu_line = "cpu MHz";
// parse /proc/cpuinfo for the line:
// cpu MHz : 2378.041
FILE *f = fopen(path,"r");
if (!f) {
perror(path);
return -1.0;
}
while (fgets(line, sizeof(line), f)) {
if (!strncmp(line, cpu_line, strlen(cpu_line))) {
s = strchr(line, ':');
if (s && 1 == sscanf(s, ":%g", &freq)) {
fclose(f);
return freq;
}
}
}
fclose(f);
return -1.0;
}
int get_ppdev_res(int dev, struct ppres *ppres)
{
FILE *f;
char path[1024], value[100],line[1024], *s;
unsigned from, to;
// parse this:
// $ cat /sys/class/ppdev/parport0/device/resources
// state = active
// io 0x378-0x37f
// irq 7
ppres->state = 0;
ppres->reg_start = 0;
ppres->reg_end = 0;
ppres->irq = 0;
sprintf(path,"/sys/class/ppdev/parport%d/device/resources",
dev);
f = fopen(path, "r");
if (!f) {
return -1;
}
while (fgets(line, sizeof(line), f)) {
if (!strncmp(line, "state", 5)) {
s = strchr(line, '=');
if (s && 1 == sscanf(s, "= %s", value)) {
ppres->state = !strcmp(value,"active");
} else {
rtapi_print_msg(RTAPI_MSG_ERR,
"get_ppdev_res: cant parse '%s'\n",
line);
fclose(f);
return -1;
}
}
if (!strncmp(line, "irq", 3)) {
if (1 != sscanf(line+4, " %d", &ppres->irq)) {
rtapi_print_msg(RTAPI_MSG_ERR,
"get_ppdev_res: cant parse '%s'\n",
line);
fclose(f);
return -1;
}
}
if (!strncmp(line, "io", 2)) {
if (2 != sscanf(line+2, " 0x%x-0x%x", &from, &to)) {
rtapi_print_msg(RTAPI_MSG_ERR,
"get_ppdev_res: cant parse '%s'\n",
line);
fclose(f);
return -1;
} else {
ppres->reg_start = from;
ppres->reg_end = to;
}
}
}
fclose(f);
return 0;
}
#endif
static int
hal_parport_get(int comp_id, hal_parport_t *port,
unsigned short base, unsigned short base_hi, unsigned int modes)
{
int i, direction;
struct ppres pp_res;
char path[PATH_MAX];
#ifndef SIM
int retval = 0;
struct parport *linux_port = 0;
#endif
memset(port, 0, sizeof(hal_parport_t));
// investigate sysfs for ppdev-created parport%d devices
for (i = 0; i < MAX_PARPORT; i++) {
if (!get_ppdev_res(i, &pp_res)) {
if (base == i)
break;
if (pp_res.reg_start == base)
break;
}
}
if (i == MAX_PARPORT) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: cant find port %d (0x%x)\n",
base, base);
return -ENODEV;
}
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: using base=0x%x\n",
pp_res.reg_start);
snprintf(path, sizeof(path),"/dev/parport%d", i);
if ((port->parport_fd = open(path,O_RDWR)) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: cant open %s: %s\n",
path, strerror(errno));
return -EPERM;
}
if (ioctl(port->parport_fd, PPCLAIM) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: cant reserve %s: %s\n",
path, strerror(errno));
return -EPERM;
}
if (ioperm(pp_res.reg_start, 3, 1) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: cant get access to 0x%x (not running as root?)\n",
pp_res.reg_start);
return -EPERM;
}
port->base = pp_res.reg_start;
port->base_hi = port->base + 0x400; // dubious..
direction = modes == PARPORT_MODE_TRISTATE;
if (ioctl(port->parport_fd, PPDATADIR, &direction) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: cant set direction (PPDATADIR) on 0x%x\n",
pp_res.reg_start);
return -EPERM;
}
#ifdef DROP_PRIV
// not a good place, but good until simdriver #2..
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: dropping root permissions to uid %d\n",
getuid());
setuid(getuid());
#endif
#ifndef SIM
// 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;
}
}
}
#endif
return 0;
}
void hal_parport_release(hal_parport_t *port)
{
#ifndef SIM
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));
#else
if (ioperm(port->pp_res.reg_start, 3, 0) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: releasing ioperm(0x%x)\n",
port->pp_res.reg_start);
}
if (ioctl(port->parport_fd, PPRELEASE) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"PARPORT: ERROR: releasing parport 0x%x: %s\n",
port->pp_res.reg_start, strerror(errno));
}
#endif
}
#endif
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