mirror of
https://github.com/lm-sensors/lm-sensors
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108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
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/*
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i2cbusses: print the installed i2c busses.
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Part of user-space programs to access for I2C
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devices.
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Copyright (c) 1999-2003 Frodo Looijaard <frodol@dds.nl> and
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <limits.h>
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#include <dirent.h>
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/*
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this just prints out the installed i2c busses in a consistent format, whether
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on a 2.4 kernel using /proc or a 2.6 kernel using /sys.
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*/
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void print_i2c_busses()
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{
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FILE *fptr;
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char s[100];
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struct dirent *de;
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DIR *dir;
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FILE *f;
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char *border;
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char dev[NAME_MAX], fstype[NAME_MAX], sysfs[NAME_MAX], n[NAME_MAX];
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int foundsysfs = 0;
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int tmp;
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int count=0;
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/* look in /proc/bus/i2c */
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if((fptr = fopen("/proc/bus/i2c", "r"))) {
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fprintf(stderr," Installed I2C busses:\n");
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while(fgets(s, 100, fptr)) {
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fprintf(stderr, " %s", s);
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count++;
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}
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fclose(fptr);
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if(count == 0)
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fprintf(stderr," Warning - no I2C busses found!\n");
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return;
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}
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/* look in sysfs */
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/* First figure out where sysfs was mounted */
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if ((f = fopen("/proc/mounts", "r")) == NULL)
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return;
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while (fgets(n, NAME_MAX, f)) {
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sscanf(n, "%[^ ] %[^ ] %[^ ] %*s\n", dev, sysfs, fstype);
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if (strcasecmp(fstype, "sysfs") == 0) {
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foundsysfs++;
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break;
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}
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}
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fclose(f);
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if (! foundsysfs)
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return;
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strcat(sysfs, "/class/i2c-adapter");
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dir = opendir(sysfs);
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if (! dir)
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return;
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fprintf(stderr," Installed I2C busses:\n");
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while ((de = readdir(dir)) != NULL) {
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if (!strcmp(de->d_name, "."))
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continue;
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if (!strcmp(de->d_name, ".."))
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continue;
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sprintf(n, "%s/%s/device/name", sysfs, de->d_name);
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if ((f = fopen(n, "r")) != NULL) {
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char x[120];
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fgets(x, 120, f);
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fclose(f);
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if((border = index(x, '\n')) != NULL)
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*border = 0;
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if(!strncmp(x, "ISA ", 4))
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fprintf(stderr, " %s\t%-10s\t%-32s\t%s\n", de->d_name,
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"dummy", x, "ISA bus algorithm");
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else if(!sscanf(de->d_name, "i2c-%x", &tmp))
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fprintf(stderr, " %s\t%-10s\t%-32s\t%s\n", de->d_name,
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"dummy", x, "Dummy bus algorithm");
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else
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fprintf(stderr, " %s\t%-10s\t%-32s\t%s\n", de->d_name,
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"unknown", x, "Algorithm unavailable");
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count++;
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}
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}
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closedir(dir);
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if(count == 0)
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fprintf(stderr," Warning - no I2C busses found!\n");
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}
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