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author | reinelt <> | 2004-01-20 14:26:09 +0000 |
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committer | reinelt <> | 2004-01-20 14:26:09 +0000 |
commit | 59bcd27cf33eaa65fac461994d8a1713f02839ae (patch) | |
tree | 91e8204ca1e5d24c61e7e32ddbbebadb2db00d66 | |
parent | f5fca64371bdb7ffa1ca2c4d9bc0a49731dd39c1 (diff) | |
download | lcd4linux-59bcd27cf33eaa65fac461994d8a1713f02839ae.tar.gz |
[lcd4linux @ 2004-01-20 14:26:09 by reinelt]
moved drv_generic to drv_generic_serial
Diffstat (limited to '')
-rw-r--r-- | drv_generic_serial.c | 322 | ||||
-rw-r--r-- | drv_generic_serial.h | 55 |
2 files changed, 377 insertions, 0 deletions
diff --git a/drv_generic_serial.c b/drv_generic_serial.c new file mode 100644 index 0000000..4eb9bff --- /dev/null +++ b/drv_generic_serial.c @@ -0,0 +1,322 @@ +/* $Id: drv_generic_serial.c,v 1.1 2004/01/20 14:26:09 reinelt Exp $ + * + * generic driver helper for serial and usbserial displays + * + * Copyright 1999, 2000 Michael Reinelt <reinelt@eunet.at> + * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * This file is part of LCD4Linux. + * + * LCD4Linux 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, or (at your option) + * any later version. + * + * LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * + * $Log: drv_generic_serial.c,v $ + * Revision 1.1 2004/01/20 14:26:09 reinelt + * moved drv_generic to drv_generic_serial + * + * Revision 1.2 2004/01/20 05:36:59 reinelt + * moved text-display-specific stuff to drv_generic_text + * moved all the bar stuff from drv_generic_bar to generic_text + * + * Revision 1.1 2004/01/20 04:51:39 reinelt + * moved generic stuff from drv_MatrixOrbital to drv_generic + * implemented new-stylish bars which are nearly finished + * + */ + +/* + * + * exported fuctions: + * + * int drv_generic_serial_open (char *driver, char *port, speed_t speed); + * opens the serial port + * + * int drv_generic_serial_read (char *string, int len); + * reads from the serial or USB port + * + * void drv_generic_serial_write (char *string, int len); + * writes to the serial or USB port + * + * int drv_generic_serial_close (void); + * closes the serial port + * + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <termios.h> +#include <fcntl.h> +#include <time.h> +#include <signal.h> +#include <sys/types.h> +#include <sys/stat.h> + +#include "debug.h" +#include "cfg.h" +#include "drv_generic_serial.h" + + +static char *Driver; +static char *Port; +static speed_t Speed; +static int Device=-1; + + +#define LOCK "/var/lock/LCK..%s" + + +// **************************************** +// *** generic serial/USB communication *** +// **************************************** + +pid_t drv_generic_serial_lock_port (char *Port) +{ + char lockfile[256]; + char tempfile[256]; + char buffer[16]; + char *port, *p; + int fd, len, pid; + + if (strncmp(Port, "/dev/", 5)==0) { + port=strdup(Port+5); + } else { + port=strdup(Port); + } + + while ((p=strchr(port, '/'))!=NULL) { + *p='_'; + } + + snprintf(lockfile, sizeof(lockfile), LOCK, port); + snprintf(tempfile, sizeof(tempfile), LOCK, "TMP.XXXXXX"); + + free (port); + + if ((fd=mkstemp(tempfile))==-1) { + error ("mkstemp(%s) failed: %s", tempfile, strerror(errno)); + return -1; + } + + if (fchmod(fd,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)==-1) { + error ("fchmod(%s) failed: %s", tempfile, strerror(errno)); + close(fd); + unlink(tempfile); + return -1; + } + + snprintf (buffer, sizeof(buffer), "%10d\n", (int)getpid()); + if (write(fd, buffer, strlen(buffer))!=strlen(buffer)) { + error ("write(%s) failed: %s", tempfile, strerror(errno)); + close(fd); + unlink(tempfile); + return -1; + } + close (fd); + + + while (link(tempfile, lockfile)==-1) { + + if (errno!=EEXIST) { + error ("link(%s, %s) failed: %s", tempfile, lockfile, strerror(errno)); + unlink(tempfile); + return -1; + } + + if ((fd=open(lockfile, O_RDONLY))==-1) { + if (errno==ENOENT) continue; // lockfile disappared + error ("open(%s) failed: %s", lockfile, strerror(errno)); + unlink (tempfile); + return -1; + } + + len=read(fd, buffer, sizeof(buffer)-1); + if (len<0) { + error ("read(%s) failed: %s", lockfile, strerror(errno)); + unlink (tempfile); + return -1; + } + + buffer[len]='\0'; + if (sscanf(buffer, "%d", &pid)!=1 || pid==0) { + error ("scan(%s) failed.", lockfile); + unlink (tempfile); + return -1; + } + + if (pid==getpid()) { + error ("%s already locked by us. uh-oh...", lockfile); + unlink(tempfile); + return 0; + } + + if ((kill(pid, 0)==-1) && errno==ESRCH) { + error ("removing stale lockfile %s", lockfile); + if (unlink(lockfile)==-1 && errno!=ENOENT) { + error ("unlink(%s) failed: %s", lockfile, strerror(errno)); + unlink(tempfile); + return pid; + } + continue; + } + unlink (tempfile); + return pid; + } + + unlink (tempfile); + return 0; +} + + +static pid_t drv_generic_serial_unlock_port (char *Port) +{ + char lockfile[256]; + char *port, *p; + + if (strncmp(Port, "/dev/", 5)==0) { + port=strdup(Port+5); + } else { + port=strdup(Port); + } + + while ((p=strchr(port, '/'))!=NULL) { + *p='_'; + } + + snprintf(lockfile, sizeof(lockfile), LOCK, port); + unlink (lockfile); + free (port); + + return 0; +} + + +int drv_generic_serial_open (char *section, char *driver) +{ + int i, fd; + pid_t pid; + struct termios portset; + + Driver = driver; + + Port=cfg_get(section, "Port", NULL); + if (Port==NULL || *Port=='\0') { + error ("%s: no '%s.Port' entry from %s", Driver, section, cfg_source()); + return -1; + } + + if (cfg_number(section, "Speed", 19200, 1200, 38400, &i)<0) return -1; + switch (i) { + case 1200: Speed = B1200; break; + case 2400: Speed = B2400; break; + case 4800: Speed = B4800; break; + case 9600: Speed = B9600; break; + case 19200: Speed = B19200; break; + case 38400: Speed = B38400; break; + default: + error ("%s: unsupported speed '%d' from %s", Driver, i, cfg_source()); + return -1; + } + + info ("%s: using port '%s' at %d baud", Driver, Port, i); + + if ((pid=drv_generic_serial_lock_port(Port))!=0) { + if (pid==-1) + error ("%s: port %s could not be locked", Driver, Port); + else + error ("%s: port %s is locked by process %d", Driver, Port, pid); + return -1; + } + + fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY); + if (fd==-1) { + error ("%s: open(%s) failed: %s", Driver, Port, strerror(errno)); + drv_generic_serial_unlock_port(Port); + return -1; + } + + if (tcgetattr(fd, &portset)==-1) { + error ("%s: tcgetattr(%s) failed: %s", Driver, Port, strerror(errno)); + drv_generic_serial_unlock_port(Port); + return -1; + } + + cfmakeraw(&portset); + cfsetospeed(&portset, Speed); + if (tcsetattr(fd, TCSANOW, &portset)==-1) { + error ("%s: tcsetattr(%s) failed: %s", Driver, Port, strerror(errno)); + drv_generic_serial_unlock_port(Port); + return -1; + } + + Device=fd; + return Device; +} + + +int drv_generic_serial_read (char *string, int len) +{ + int run, ret; + + if (Device==-1) return -1; + for (run=0; run<10; run++) { + ret=read (Device, string, len); + if (ret>=0 || errno!=EAGAIN) break; + debug ("read(): EAGAIN"); + usleep(1000); + } + + if (ret<0) { + error("%s: read(%s, %d) failed: %s", Driver, Port, len, strerror(errno)); + } else if (ret!=len) { + error ("%s: partial read: len=%d ret=%d", Driver, len, ret); + } + + return ret; +} + + +void drv_generic_serial_write (char *string, int len) +{ + int run, ret; + + if (Device==-1) return; + for (run=0; run<10; run++) { + ret=write (Device, string, len); + if (ret>=0 || errno!=EAGAIN) break; + debug ("write(): EAGAIN"); + usleep(1000); + } + + if (ret<0) { + error ("MatrixOrbital: write(%s) failed: %s", Port, strerror(errno)); + } else if (ret!=len) { + error ("MatrixOrbital: partial write: len=%d ret=%d", len, ret); + } + + return; +} + + +int drv_generic_serial_close (void) +{ + debug ("%s: closing port %s", Driver, Port); + close (Device); + drv_generic_serial_unlock_port(Port); + return 0; +} + diff --git a/drv_generic_serial.h b/drv_generic_serial.h new file mode 100644 index 0000000..a0a1de2 --- /dev/null +++ b/drv_generic_serial.h @@ -0,0 +1,55 @@ +/* $Id: drv_generic_serial.h,v 1.1 2004/01/20 14:26:09 reinelt Exp $ + * + * generic driver helper for serial and usbserial displays + * + * Copyright 1999, 2000 Michael Reinelt <reinelt@eunet.at> + * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * This file is part of LCD4Linux. + * + * LCD4Linux 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, or (at your option) + * any later version. + * + * LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * + * $Log: drv_generic_serial.h,v $ + * Revision 1.1 2004/01/20 14:26:09 reinelt + * moved drv_generic to drv_generic_serial + * + * Revision 1.2 2004/01/20 05:36:59 reinelt + * moved text-display-specific stuff to drv_generic_text + * moved all the bar stuff from drv_generic_bar to generic_text + * + * Revision 1.1 2004/01/20 04:51:39 reinelt + * moved generic stuff from drv_MatrixOrbital to drv_generic + * implemented new-stylish bars which are nearly finished + * + */ + +/* + * + * exported fuctions: + * + * Fixme: document me! + * + */ + +#ifndef _DRV_GENERIC_SERIALH_ +#define _DRV_GENERIC_SERIAL_H_ + +int drv_generic_serial_open (char *section, char *driver); +int drv_generic_serial_read (char *string, int len); +void drv_generic_serial_write (char *string, int len); +int drv_generic_serial_close (void); + +#endif |