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/* linux.c
*
* (c) 2003, 2004, 2005, 2006 Markus Heinz
*
* This software is licensed under the terms of the GPL.
* For details see file COPYING.
*/
#include "inklevel.h"
#include <ieee1284.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#define IOCNR_GET_DEVICE_ID 1
#define LPIOC_GET_DEVICE_ID _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, BUFLEN)
int get_device_id(int port, int portnumber, char *device_id);
int open_printer_device(int port, int portnumber);
/* This function retrieves the device id of the specified port */
int get_device_id(int port, int portnumber, char *device_id) {
struct parport_list parports;
char tmp[BUFLEN];
char device_file[256];
char device_file2[256];
int size;
int fd;
char *c;
int realsize;
if (port == PARPORT ) {
/* check if we have appropiate permissions */
sprintf(device_file, "/dev/parport%d", portnumber);
if ((fd = open(device_file, O_RDWR)) < 0) {
return DEV_PARPORT_INACCESSIBLE;
}
close(fd);
sprintf(device_file, "/dev/lp%d", portnumber);
if ((fd = open(device_file, O_RDWR)) < 0) {
return DEV_LP_INACCESSIBLE;
}
close(fd);
if (ieee1284_find_ports(&parports, 0) == E1284_OK) {
if (portnumber < parports.portc) {
size = ieee1284_get_deviceid(parports.portv[portnumber], -1,
F1284_FRESH, tmp, BUFLEN);
if (size >= 2) {
strncpy(device_id, tmp + 2, size - 2);
return OK;
}
}
}
return COULD_NOT_GET_DEVICE_ID;
} else if (port == USB) {
sprintf(device_file, "/dev/usb/lp%d", portnumber);
sprintf(device_file2, "/dev/usblp%d", portnumber);
fd = open(device_file, O_RDONLY);
if (fd == -1) {
fd = open(device_file2, O_RDONLY);
}
if (fd == -1) {
return DEV_USB_LP_INACCESSIBLE;
}
if (ioctl(fd, LPIOC_GET_DEVICE_ID, tmp) < 0) {
close(fd);
return COULD_NOT_GET_DEVICE_ID;
}
close(fd);
size = ((unsigned char) tmp[0] << 8) | ((unsigned char) tmp[1]);
/* Some printers report the size of the device id incorrectly. */
realsize = 2;
c = &tmp[2];
while (*c++ != '\0') {
realsize++;
}
#ifdef DEBUG
printf("Printer reported size %d, real size is %d\n", size, realsize);
#endif
size = (realsize < size) ? realsize : size;
size = (size < BUFLEN - 1) ? size : BUFLEN - 1;
tmp[size] = '\0';
if (size >= 2) {
strncpy(device_id, tmp + 2, size - 2);
return OK;
} else {
return COULD_NOT_GET_DEVICE_ID;
}
} else {
return UNKNOWN_PORT_SPECIFIED;
}
}
int open_printer_device(int port, int portnumber) {
char device_file[256];
char device_file2[256];
int fd;
if (port == USB) {
sprintf(device_file, "/dev/usb/lp%d", portnumber);
sprintf(device_file2, "/dev/usblp%d", portnumber);
} else if (port == PARPORT) {
sprintf(device_file, "/dev/lp%d", portnumber);
} else {
return UNKNOWN_PORT_SPECIFIED;
}
#ifdef DEBUG
printf("Device file: %s\n", device_file);
#endif
fd = open(device_file, O_RDWR);
if (fd == -1 && port == USB) {
#ifdef DEBUG
printf("Could not open %s\n", device_file);
printf("Device file: %s\n", device_file2);
#endif
fd = open(device_file2, O_RDWR);
if (fd == -1) {
#ifdef DEBUG
printf("Could not open %s\n", device_file2);
#endif
}
} else if (fd == -1 && port == PARPORT) {
#ifdef DEBUG
printf("Could not open %s\n", device_file);
#endif
}
if (fd == -1) {
if (port == USB) {
return DEV_USB_LP_INACCESSIBLE;
} else {
return DEV_LP_INACCESSIBLE;
}
} else {
return fd;
}
}
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