add directory bin-src
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gohigh
207
bin-src/setserial.c
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207
bin-src/setserial.c
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From owner-linux-activists@joker.cs.hut.fi Tue Jul 14 05:42:55 1992
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Received: from funet.fi by lazy.qt.IPA.FhG.de with SMTP
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(5.61+/IDA-1.2.8/gandalf.2) id AA09550; Tue, 14 Jul 92 05:42:52 +0200
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Received: from santra.hut.fi by funet.fi with SMTP (PP) id <24104-0@funet.fi>;
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Tue, 14 Jul 1992 06:41:04 +0300
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Tue, 14 Jul 92 06:39:34 +0300
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Tue, 14 Jul 92 06:33:44 +0300
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with SMTP (5.61/UUNET-internet-primary) id AA00942;
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Mon, 13 Jul 92 23:34:03 -0400
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Mon, 13 Jul 92 23:33:37 -0400
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Date: Mon, 13 Jul 92 23:33:37 -0400
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From: jrs@world.std.com (Rick Sladkey)
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Message-Id: <9207140333.AA12321@world.std.com>
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Sender: owner-linux-activists@niksula.hut.fi
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To: linux-activists@niksula.hut.fi
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X-Note1: Remember to put 'X-Mn-Key: normal' to your mail body or header
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Subject: setserial.c
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X-Mn-Key: NORMAL
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Here is a program that uses the recent serial ioctl calls to change
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the port or IRQ of a serial device. I use it to change /dev/ttys3 to
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IRQ 5. You must be root to run it or make it setuid to root. Please
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be careful when specifying port numbers!
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If you get the message "Device busy" it means that you have another
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serial port currently using that IRQ or that you have specified an IRQ
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that is used by another hardware device such as the keyboard or a hard
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disk controller.
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IRQs 2, 3, 4, and 5 are typically available and can often be set by
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DIP switches or jumpers on your serial card. With 0.96c patchlevel 1
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or higher you can use any IRQ that your card lets you configure and
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that is unused by Linux. If you are not sure, go ahead and try.
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Linux will let you know.
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Some examples:
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# setserial
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usage: setserial serial-device [ port irq ]
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for example: setserial /dev/ttys3 0x03e8 5
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Use a leading '0x' for hex numbers.
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CAUTION: Using an invalid port can lock up your machine!
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# setserial /dev/ttys3
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/dev/ttys3, Type: 16450, Line: 2, Port: 0x03e8, IRQ: 4
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# setserial /dev/ttys3 0 5
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/dev/ttys3, Type: 16450, Line: 2, Port: 0x03e8 (was 0x03e8), IRQ: 5 (was 4)
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#
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There is a minor bug that prevents this from working with 0.96c
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patchlevel 1. Use unpatched 0.96c, wait for 0.96c patchlevel 2, or
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apply this patch.
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*** linux/kernel/chr_drv/serial.c.orig Sun Jul 12 23:48:13 1992
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--- linux/kernel/chr_drv/serial.c Mon Jul 13 19:28:37 1992
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***************
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*** 416,421 ****
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--- 416,422 ----
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retval = request_irq(new_irq,handler);
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if (retval)
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return retval;
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+ info->irq = new_irq;
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free_irq(irq);
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}
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cli();
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I have uploaded setserial.tar.Z to banjo and tsx-11.
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Rick Sladkey
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jrs@world.std.com
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-----
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/* setserial.c - get/set Linux serial port info - rick sladkey */
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/* compile with something like:
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CC = gcc
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CFLAGS = -nostdinc -I/usr/src/linux/include -I/usr/include
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setserial: setserial.c
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$(CC) $(CFLAGS) setserial.c -o setserial
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <string.h>
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#include <linux/fs.h>
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#include <linux/tty.h>
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char *progname;
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struct serial_type_struct {
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int id;
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char *name;
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} serial_type_tbl[] = {
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PORT_UNKNOWN, "unknown",
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PORT_8250, "8250",
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PORT_16450, "16450",
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PORT_16550, "16550",
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PORT_16550A, "16550A",
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-1, NULL
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};
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char *serial_type(int id)
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{
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int i;
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for (i = 0; serial_type_tbl[i].id != -1; i++)
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if (id == serial_type_tbl[i].id)
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return serial_type_tbl[i].name;
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return "undefined";
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}
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int atonum(char *s)
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{
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int n;
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while (*s == ' ')
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s++;
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if (strncmp(s, "0x", 2) == 0 || strncmp(s, "0X", 2) == 0)
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sscanf(s + 2, "%x", &n);
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else if (s[0] == '0' && s[1])
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sscanf(s + 1, "%o", &n);
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else
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sscanf(s, "%d", &n);
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return n;
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}
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void getserial(char *device, int fd)
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{
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struct serial_struct serinfo;
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if (ioctl(fd, TIOCGSERIAL, &serinfo) < 0) {
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perror("Cannot get serial info");
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exit(1);
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}
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printf("%s, Type: %s, Line: %d, Port: 0x%.4x, IRQ: %d\n",
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device, serial_type(serinfo.type),
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serinfo.line, serinfo.port, serinfo.irq);
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}
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void setserial(char *device, int fd, int port, int irq)
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{
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struct serial_struct old_serinfo, new_serinfo;
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if (ioctl(fd, TIOCGSERIAL, &old_serinfo) < 0) {
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perror("Cannot get serial info");
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exit(1);
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}
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new_serinfo = old_serinfo;
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new_serinfo.port = port;
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new_serinfo.irq = irq;
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if (ioctl(fd, TIOCSSERIAL, &new_serinfo) < 0) {
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perror("Cannot set serial info");
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exit(1);
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}
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if (ioctl(fd, TIOCGSERIAL, &new_serinfo) < 0) {
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perror("Cannot get serial info");
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exit(1);
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}
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printf("%s, Type: %s, Line: %d, "
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"Port: 0x%.4x (was 0x%.4x), IRQ: %d (was %d)\n",
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device, serial_type(new_serinfo.type),
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new_serinfo.line, new_serinfo.port, old_serinfo.port,
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new_serinfo.irq, old_serinfo.irq);
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}
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main(int argc, char **argv)
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{
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char *device;
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int fd;
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progname = argv[0];
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if (argc == 1) {
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fprintf(stderr, "usage: %s serial-device [ port irq ]\n",
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progname);
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fprintf(stderr, "for example: %s /dev/ttys3 0x03e8 5\n",
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progname);
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fprintf(stderr, "Use a leading '0x' for hex numbers.\n");
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fprintf(stderr, "CAUTION: "
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"Using an invalid port can lock up your machine!\n");
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exit(1);
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}
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device = argv[1];
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if ((fd = open(device, O_RDWR)) < 0) {
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perror("Cannot open serial device");
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exit(1);
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}
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if (argc == 2)
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getserial(device, fd);
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else if (argc == 4)
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setserial(device, fd, atonum(argv[2]), atonum(argv[3]));
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else {
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fprintf(stderr, "%s: wrong number of arguments\n", progname);
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exit(1);
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}
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exit(0);
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}
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