libsensors: Missing sysfs busses and classes are not errors. This tends

to confuse users a lot, to report the lack of hwmon driver as an error.
prog/sensors: Clearer error messages when no sensors are found. The
most frequent cause is a lack of drivers, not procfs/sysfs problems.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4159 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -16,6 +16,7 @@ lm_sensors CHANGES file
            Add support for the IT8716F and IT8718F chips
            Add support for the W83793 chip (Yuan Mu)
            Map the 2.6 adm1026's fan8 to fan0
+           Missing sysfs busses and classes are not errors
   Makefile: Don't grep autoconf.h on user-space targets
             Fix depmod on non-running kernel version
   Module i2c-ali1535: Drop redundant semaphore (2.6 backport)
@@ -59,6 +60,7 @@ lm_sensors CHANGES file
                    Add w83793 support (Yuan Mu)
                    The adt7463 may not have in4 (#2119)
                    Hide more vt1211 missing input errors
+                   Clearer error messages when no sensors found
   Program sensors-detect: Add ServerWorks HT-1000 SMBus detection
                           Add ATI IXP200/300/400 SMBus detection
                           Prevent warning on 64-bit PCI addresses

lib/sysfs.c

@@ -112,12 +112,13 @@ static int sensors_read_sysfs_chips_compat(void)
 	int ret = 0;
 
 	if (!(bus = sysfs_open_bus("i2c"))) {
-		ret = -SENSORS_ERR_PROC;
+		if (errno && errno != ENOENT)
+			ret = -SENSORS_ERR_PROC;
 		goto exit0;
 	}
 
 	if (!(devs = sysfs_get_bus_devices(bus))) {
-		if (errno)
+		if (errno && errno != ENOENT)
 			ret = -SENSORS_ERR_PROC;
 		goto exit1;
 	}
@@ -148,7 +149,7 @@ int sensors_read_sysfs_chips(void)
 	}
 
 	if (!(clsdevs = sysfs_get_class_devices(cls))) {
-		if (errno)
+		if (errno && errno != ENOENT)
 			ret = -SENSORS_ERR_PROC;
 		goto exit;
 	}
@@ -185,7 +186,7 @@ int sensors_read_sysfs_bus(void)
 	}
 
 	if (!(clsdevs = sysfs_get_class_devices(cls))) {
-		if (errno)
+		if (errno && errno != ENOENT)
 			ret = -SENSORS_ERR_PROC;
 		goto exit1;
 	}

prog/sensors/main.c

@@ -238,10 +238,9 @@ int main (int argc, char *argv[])
     fprintf(stderr,"%s\n",sensors_strerror(res));
     if (res == -SENSORS_ERR_PROC)
       fprintf(stderr,
-              "Unable to find i2c bus information;\n"
+              "Kernel interface access error\n"
               "For 2.6 kernels, make sure you have mounted sysfs and libsensors\n"
-              "was compiled with sysfs support!\n"
-              "For older kernels, make sure you have done 'modprobe i2c-proc'!\n");
+              "was compiled with sysfs support!\n");
     exit(1);
   }
 
@@ -256,7 +255,10 @@ int main (int argc, char *argv[])
     exit(error);
   } else {
     if(chips[0].prefix == SENSORS_CHIP_NAME_PREFIX_ANY)
-	    fprintf(stderr,"No sensors found!\n");
+	    fprintf(stderr,
+	            "No sensors found!\n"
+	            "Make sure you loaded all the kernel drivers you need.\n"
+	            "Try sensors-detect to find out which these are.\n");
     else
 	    fprintf(stderr,"Specified sensor(s) not found!\n");
     sensors_cleanup();