[lm-sensors] LM75: "ERROR: Can't get temperature data!"

[lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Michael Brian Willis]

Hello, 

I am having trouble getting my LM75 temp sensor to work on a custom
embedded system. I have two MAX1619 chips that appear to be recognized
by the "sensors" command. Also, "sensors-detect" seems to find
everybody. However, I get "ERROR: Can't get temperature data" for the
LM75 when I run the "sensors" command (see below).  

--------
[root@myboard]# sensors
max1619-i2c-0-19
Adapter: MPC adapter
M/B Temp: 33.00 (temp1)
CPU Temp: 0.00 (temp2)

max1619-i2c-0-1a
Adapter: MPC adapter
M/B Temp: 30.00 (temp1)
CPU Temp: 127.00 (temp2)

lm75-i2c-0-48
Adapter: MPC adapter
ERROR: Can't get temperature data!

Here are some relevant version numbers: 
Denx Linux kernel: 2.6.21
libsensors: 2.10.5
sysfsutils: 2.1.0
i2ctools: 3.0.0
--------

I have the LM75 kernel module loaded: 
[root@myboard]# lsmod
Module                  Size  Used by
lm75                    4592  0
max1619                 5776  0

Any help anybody can provide is greatly appreciated, 

Regards, 

Michael Willis
Applied Research Labs - University of Texas
willis <at> arlut . utexas . edu







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Re: [lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Jean Delvare]

Hi Michael,

On Fri, 02 Nov 2007 16:30:13 -0500, Michael Brian Willis wrote:
> I am having trouble getting my LM75 temp sensor to work on a custom
> embedded system. I have two MAX1619 chips that appear to be recognized
> by the "sensors" command. Also, "sensors-detect" seems to find
> everybody. However, I get "ERROR: Can't get temperature data" for the
> LM75 when I run the "sensors" command (see below).  
> 
> --------
> [root@myboard]# sensors
> max1619-i2c-0-19
> Adapter: MPC adapter
> M/B Temp: 33.00 (temp1)
> CPU Temp: 0.00 (temp2)
> 
> max1619-i2c-0-1a
> Adapter: MPC adapter
> M/B Temp: 30.00 (temp1)
> CPU Temp: 127.00 (temp2)
> 
> lm75-i2c-0-48
> Adapter: MPC adapter
> ERROR: Can't get temperature data!
> 
> Here are some relevant version numbers: 
> Denx Linux kernel: 2.6.21
> libsensors: 2.10.5
> sysfsutils: 2.1.0
> i2ctools: 3.0.0

Note: i2ctools doesn't matter here.

> --------
> 
> I have the LM75 kernel module loaded: 
> [root@myboard]# lsmod
> Module                  Size  Used by
> lm75                    4592  0
> max1619                 5776  0
> 
> Any help anybody can provide is greatly appreciated, 

Odd. Please check that no older libsensors version gets in the way
(sensors -v). If you have strace installed, please provide the output
of "strace sensors".

Also, please provide the output of "ls -lR /sys/class/hwmon/*/device/".

-- 
Jean Delvare

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Re: [lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Michael Brian Willis]

Jean, 

Thank you for your response. Below is the information you requested. 
Thanks again for your help!

Michael Willis

-----

> Odd. Please check that no older libsensors version gets in the way
> (sensors -v).
[root@myboard /]# sensors -v
sensors version 2.10.5 with libsensors version 2.10.5


> Also, please provide the output of "ls -lR /sys/class/hwmon/*/device/".
[root@myboard /]# ls -lR /sys/class/hwmon/*/device/
/sys/class/hwmon/hwmon0/device/:
total 0
-r--r--r-- 1 root root 4096 Dec 31  1969 alarms
lrwxrwxrwx 1 root root    0 Dec 31  1969 bus -> ../../../../../bus/i2c
lrwxrwxrwx 1 root root    0 Dec 31  1969 driver -
> ../../../../../bus/i2c/drivers/max1619
lrwxrwxrwx 1 root root    0 Dec 31  1969 hwmon:hwmon0 -
> ../../../../../class/hwmon/hwmon0
-r--r--r-- 1 root root 4096 Dec 31  1969 name
lrwxrwxrwx 1 root root    0 Dec 31  1969 subsystem -
> ../../../../../bus/i2c
-r--r--r-- 1 root root 4096 Dec 31  1969 temp1_input
-rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_crit
-rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_crit_hyst
-r--r--r-- 1 root root 4096 Dec 31  1969 temp2_input
-rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_max
-rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_min
--w------- 1 root root 4096 Dec 31  1969 uevent

/sys/class/hwmon/hwmon1/device/:
total 0
lrwxrwxrwx 1 root root    0 Dec 31  1969 bus -> ../../../../../bus/i2c
lrwxrwxrwx 1 root root    0 Dec 31  1969 driver -
> ../../../../../bus/i2c/drivers/lm75
lrwxrwxrwx 1 root root    0 Dec 31  1969 hwmon:hwmon1 -
> ../../../../../class/hwmon/hwmon1
drwxr-xr-x 2 root root    0 Dec 31  1969 lm75
-r--r--r-- 1 root root 4096 Dec 31  1969 name
lrwxrwxrwx 1 root root    0 Dec 31  1969 subsystem -
> ../../../../../bus/i2c
--w------- 1 root root 4096 Dec 31  1969 uevent

/sys/class/hwmon/hwmon1/device/lm75:
total 0
-r--r--r-- 1 root root 4096 Dec 31  1969 temp1_input
-rw-r--r-- 1 root root 4096 Dec 31  1969 temp1_max
-rw-r--r-- 1 root root 4096 Dec 31  1969 temp1_max_hyst



>  If you have strace installed, please provide the output
> of "strace sensors".
[root@myboard /]# strace sensors
execve("/usr/local/bin/sensors", ["sensors"], [/* 19 vars */]) = 0
brk(0)                                  = 0x10039000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
directory)
open("/usr/local/lib/tls/ppc8540/libsensors.so.3", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/usr/local/lib/tls/ppc8540", 0x7ff84088) = -1 ENOENT (No such
file or directory)
open("/usr/local/lib/tls/libsensors.so.3", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/usr/local/lib/tls", 0x7ff84088) = -1 ENOENT (No such file or
directory)
open("/usr/local/lib/ppc8540/libsensors.so.3", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/usr/local/lib/ppc8540", 0x7ff84088) = -1 ENOENT (No such file
or directory)
open("/usr/local/lib/libsensors.so.3", O_RDONLY) = 3
read(3, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\0\0\320"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size%1817, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30000000
mmap(0xff65000, 306020, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0xff65000
mprotect(0xff7f000, 61440, PROT_NONE)   = 0
mmap(0xff8e000, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_DENYWRITE, 3, 0x19000) = 0xff8e000
mmap(0xffaf000, 2916, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_ANONYMOUS, -1, 0) = 0xffaf000
close(3)                                = 0
open("/usr/local/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size8842, ...}) = 0
mmap(NULL, 38842, PROT_READ, MAP_PRIVATE, 3, 0) = 0x30001000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\17\345"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size\x1793784, ...}) = 0
mmap(0xfe40000, 1520028, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0x3000b000
mprotect(0x3016a000, 53248, PROT_NONE)  = 0
mmap(0x30177000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_DENYWRITE, 3, 0x16c000) = 0x30177000
mmap(0x3017c000, 8604, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_ANONYMOUS, -1, 0) = 0x3017c000
close(3)                                = 0
open("/usr/local/lib/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/lib/libm.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\17\323"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size†5520, ...}) = 0
mmap(0xfd30000, 852680, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0xfd30000
mprotect(0xfde2000, 106496, PROT_NONE)  = 0
mmap(0xfdfc000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_DENYWRITE, 3, 0xbc000) = 0xfdfc000
close(3)                                = 0
open("/usr/local/lib/libsysfs.so.2", O_RDONLY) = 3
read(3, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\0\0-`"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size\x113414, ...}) = 0
mmap(0xfd05000, 109684, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0xfd05000
mprotect(0xfd10000, 61440, PROT_NONE)   = 0
mmap(0xfd1f000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_DENYWRITE, 3, 0xa000) = 0xfd1f000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x3017f000
mprotect(0xfdfc000, 16384, PROT_READ)   = 0
mprotect(0x30177000, 16384, PROT_READ)  = 0
mprotect(0xffef000, 4096, PROT_READ)    = 0
munmap(0x30001000, 38842)               = 0
brk(0)                                  = 0x10039000
brk(0x1005a000)                         = 0x1005a000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_sizeU553968, ...}) = 0
mmap2(NULL, 2097152, PROT_READ, MAP_PRIVATE, 3, 0) = 0x30180000
close(3)                                = 0
open("/etc/sensors.conf", O_RDONLY)     = 3
lstat64("/sys/class/i2c-adapter", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
open("/sys/class/i2c-adapter", O_RDONLY|O_NONBLOCK|O_LARGEFILE|
O_DIRECTORY) = 4
fstat64(4, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
getdents(4, /* 3 entries */, 4096)      = 52
lstat64("/sys/class/i2c-adapter/i2c-0", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
getdents(4, /* 0 entries */, 4096)      = 0
close(4)                                = 0
lstat64("/sys/class/i2c-adapter/i2c-0", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
open("/sys/class/i2c-adapter", O_RDONLY|O_NONBLOCK|O_LARGEFILE|
O_DIRECTORY) = 4
fstat64(4, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
getdents(4, /* 3 entries */, 4096)      = 52
lstat64("/sys/class/i2c-adapter/i2c-0", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
getdents(4, /* 0 entries */, 4096)      = 0
close(4)                                = 0
lstat64("/sys/class/i2c-adapter/i2c-0/name", {st_mode=S_IFREG|0444,
st_size@96, ...}) = 0
stat64("/sys/class/i2c-adapter/i2c-0/name", {st_mode=S_IFREG|0444,
st_size@96, ...}) = 0
open("/sys/class/i2c-adapter/i2c-0/name", O_RDONLY) = 4
read(4, "MPC adapter\n", 4096)          = 12
close(4)                                = 0
lstat64("/sys/class/hwmon", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
open("/sys/class/hwmon", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) 4
fstat64(4, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
getdents(4, /* 4 entries */, 4096)      = 72
lstat64("/sys/class/hwmon/hwmon1", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
lstat64("/sys/class/hwmon/hwmon0", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
getdents(4, /* 0 entries */, 4096)      = 0
close(4)                                = 0
lstat64("/sys/class/hwmon/hwmon0", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
lstat64("/sys/class/hwmon/hwmon1", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
open("/sys/class/hwmon", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) 4
fstat64(4, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
getdents(4, /* 4 entries */, 4096)      = 72
lstat64("/sys/class/hwmon/hwmon1", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
lstat64("/sys/class/hwmon/hwmon0", {st_mode=S_IFDIR|0755,
st_size=0, ...}) = 0
getdents(4, /* 0 entries */, 4096)      = 0
close(4)                                = 0
lstat64("/sys/class/hwmon/hwmon0/device", {st_mode=S_IFLNK|0777,
st_size=0, ...}) = 0
readlink("/sys/class/hwmon/hwmon0/device",
"../../../devices/platform/fsl-i2c.1/i2c-0/0-001a", 256) = 48
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a",
{st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/bus",
{st_mode=S_IFLNK|0777, st_size=0, ...}) = 0
readlink("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/bus",
"../../../../../bus/i2c", 256) = 22
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/driver",
{st_mode=S_IFLNK|0777, st_size=0, ...}) = 0
readlink("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/driver",
"../../../../../bus/i2c/drivers/max1619", 256) = 38
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/subsystem",
{st_mode=S_IFLNK|0777, st_size=0, ...}) = 0
readlink("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/subsystem",
"../../../../../bus/i2c", 256) = 22
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/name",
{st_mode=S_IFREG|0444, st_size@96, ...}) = 0
stat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/name",
{st_mode=S_IFREG|0444, st_size@96, ...}) = 0
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/name", O_RDONLY) = 4
read(4, "max1619\n", 4096)              = 8
close(4)                                = 0
stat64("/sys/class/i2c-adapter/i2c-0/device/name", {st_mode=S_IFREG|
0444, st_size@96, ...}) = 0
open("/sys/class/i2c-adapter/i2c-0/device/name", O_RDONLY) = 4
read(4, "MPC adapter\n", 4096)          = 12
close(4)                                = 0
lstat64("/sys/class/hwmon/hwmon1/device", {st_mode=S_IFLNK|0777,
st_size=0, ...}) = 0
readlink("/sys/class/hwmon/hwmon1/device",
"../../../devices/platform/fsl-i2c.1/i2c-0/0-0048", 256) = 48
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048",
{st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/bus",
{st_mode=S_IFLNK|0777, st_size=0, ...}) = 0
readlink("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/bus",
"../../../../../bus/i2c", 256) = 22
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/driver",
{st_mode=S_IFLNK|0777, st_size=0, ...}) = 0
readlink("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/driver",
"../../../../../bus/i2c/drivers/lm75", 256) = 35
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/subsystem",
{st_mode=S_IFLNK|0777, st_size=0, ...}) = 0
readlink("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/subsystem",
"../../../../../bus/i2c", 256) = 22
lstat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/name",
{st_mode=S_IFREG|0444, st_size@96, ...}) = 0
stat64("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/name",
{st_mode=S_IFREG|0444, st_size@96, ...}) = 0
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/name", O_RDONLY) = 4
read(4, "lm75\n", 4096)                 = 5
close(4)                                = 0
stat64("/sys/class/i2c-adapter/i2c-0/device/name", {st_mode=S_IFREG|
0444, st_size@96, ...}) = 0
open("/sys/class/i2c-adapter/i2c-0/device/name", O_RDONLY) = 4
read(4, "MPC adapter\n", 4096)          = 12
close(4)                                = 0
ioctl(3, TCGETS, 0x7ff84848)            = -1 ENOTTY (Inappropriate ioctl
for device)
fstat64(3, {st_mode=S_IFREG|0644, st_size…179, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30001000
read(3, "# Sensors configuration file use"..., 8192) = 8192
read(3, "its may have all sorts of weird "..., 8192) = 8192
read(3, "+12V\"\n    label in5 \"-12V\"\n    l"..., 8192) = 8192
read(3, "1 \"Fan1\"\n    label fan2 \"Fan2\"\n "..., 8192) = 8192
read(3, "\n# What is your VCore? It is pro"..., 8192) = 8192
read(3, "fixed inside\n# the chip for thes"..., 8192) = 8192
read(3, " compute in5 -(36/10)*@, -@/(36/"..., 8192) = 8192
read(3, "r kernels only.\n#  set    ain_co"..., 8192) = 8192
read(3, "(^ (3435 / 298.15 - 3435 / (273."..., 8192) = 8192
read(3, "@/2\n   compute in10  @*2, @/2\n\n#"..., 8192) = 8192
read(3, "an3 \"SYS FAN Speed\"\n   label fan"..., 8192) = 3259
read(3, "", 4096)                       = 0
read(3, "", 8192)                       = 0
ioctl(3, TCGETS, 0x7ff83868)            = -1 ENOTTY (Inappropriate ioctl
for device)
close(3)                                = 0
munmap(0x30001000, 4096)                = 0
open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size%460, ...}) = 0
mmap(NULL, 25460, PROT_READ, MAP_SHARED, 3, 0) = 0x30001000
close(3)                                = 0
open("/usr/lib/gconv/ISO8859-1.so", O_RDONLY) = 3
read(3, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\0\0\4"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_sizef876, ...}) = 0
mmap(0xfcd4000, 131096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0xfcd4000
mprotect(0xfcd6000, 118784, PROT_NONE)  = 0
mmap(0xfcf3000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_DENYWRITE, 3, 0xf000) = 0xfcf3000
close(3)                                = 0
mprotect(0xfcf3000, 4096, PROT_READ)    = 0
brk(0x1007f000)                         = 0x1007f000
brk(0x10077000)                         = 0x10077000
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(4, 64), ...}) = 0
ioctl(1, TCGETS, {B115200 opost isig icanon echo ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30008000
write(1, "max1619-i2c-0-1a\n", 17max1619-i2c-0-1a
)      = 17
write(1, "Adapter: MPC adapter\n", 21Adapter: MPC adapter
)  = 21
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp1_input",
O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "28000\n", 4096)                = 6
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "M/B Temp: 28.00 (temp1)\n", 24M/B Temp: 28.00 (temp1)
) = 24
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_input",
O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "127000\n", 4096)               = 7
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "CPU Temp: 127.00 (temp2)\n", 25CPU Temp: 127.00 (temp2)
) = 25
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_min_label",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_min", O_RDONLY)
= 3
fstat64(3, {st_mode=S_IFREG|0644, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "-55000\n", 4096)               = 7
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "  temp2_min: -55.00 (temp2_min)\n", 32  temp2_min: -55.00
(temp2_min)
) = 32
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_max_label",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_max", O_RDONLY)
= 3
fstat64(3, {st_mode=S_IFREG|0644, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "127000\n", 4096)               = 7
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "  temp2_max: 127.00 (temp2_max)\n", 32  temp2_max: 127.00
(temp2_max)
) = 32
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_crit_label",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_crit",
O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "100000\n", 4096)               = 7
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "  temp2_crit: 100.00 (temp2_crit"..., 34  temp2_crit: 100.00
(temp2_crit)
) = 34
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_hyst_label",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/temp2_crit_hyst",
O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "95000\n", 4096)                = 6
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "  temp2_hyst: 95.00 (temp2_hyst)"..., 33  temp2_hyst: 95.00
(temp2_hyst)
) = 33
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/alarms_label",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-001a/alarms", O_RDONLY) 3
fstat64(3, {st_mode=S_IFREG|0444, st_size@96, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x30009000
read(3, "148\n", 4096)                  = 4
close(3)                                = 0
munmap(0x30009000, 4096)                = 0
write(1, "alarms: 148.00 (alarms)\n", 24alarms: 148.00 (alarms)
) = 24
write(1, "\n", 1
)                       = 1
write(1, "lm75-i2c-0-48\n", 14lm75-i2c-0-48
)         = 14
write(1, "Adapter: MPC adapter\n", 21Adapter: MPC adapter
)  = 21
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/temp_label",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/temp1_input",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sys/devices/platform/fsl-i2c.1/i2c-0/0-0048/_", O_RDONLY) = -1
ENOENT (No such file or directory)
write(1, "ERROR: Can\'t get temperature dat"..., 35ERROR: Can't get
temperature data!
) = 35
write(1, "\n", 1
)                       = 1
exit_group(0)                           = ?
Process 1966 detached

---------




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Re: [lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Jean Delvare]

Hi Michael,

On Tue, 06 Nov 2007 12:10:39 -0600, Michael Brian Willis wrote:
> Thank you for your response. Below is the information you requested. 
> Thanks again for your help!
> -----
> 
> > Odd. Please check that no older libsensors version gets in the way
> > (sensors -v).
> [root@myboard /]# sensors -v
> sensors version 2.10.5 with libsensors version 2.10.5

OK, that's correct.

> > Also, please provide the output of "ls -lR /sys/class/hwmon/*/device/".
> [root@myboard /]# ls -lR /sys/class/hwmon/*/device/
> /sys/class/hwmon/hwmon0/device/:
> total 0
> -r--r--r-- 1 root root 4096 Dec 31  1969 alarms

Unrelated to your problem, but it seems to me that your clock is slightly off ;)

> lrwxrwxrwx 1 root root    0 Dec 31  1969 bus -> ../../../../../bus/i2c
> lrwxrwxrwx 1 root root    0 Dec 31  1969 driver -> ../../../../../bus/i2c/drivers/max1619
> lrwxrwxrwx 1 root root    0 Dec 31  1969 hwmon:hwmon0 -> ../../../../../class/hwmon/hwmon0
> -r--r--r-- 1 root root 4096 Dec 31  1969 name
> lrwxrwxrwx 1 root root    0 Dec 31  1969 subsystem -> ../../../../../bus/i2c
> -r--r--r-- 1 root root 4096 Dec 31  1969 temp1_input
> -rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_crit
> -rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_crit_hyst
> -r--r--r-- 1 root root 4096 Dec 31  1969 temp2_input
> -rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_max
> -rw-r--r-- 1 root root 4096 Dec 31  1969 temp2_min
> --w------- 1 root root 4096 Dec 31  1969 uevent

This one looks correct.

> /sys/class/hwmon/hwmon1/device/:
> total 0
> lrwxrwxrwx 1 root root    0 Dec 31  1969 bus -> ../../../../../bus/i2c
> lrwxrwxrwx 1 root root    0 Dec 31  1969 driver -> ../../../../../bus/i2c/drivers/lm75
> lrwxrwxrwx 1 root root    0 Dec 31  1969 hwmon:hwmon1 -> ../../../../../class/hwmon/hwmon1
> drwxr-xr-x 2 root root    0 Dec 31  1969 lm75
> -r--r--r-- 1 root root 4096 Dec 31  1969 name
> lrwxrwxrwx 1 root root    0 Dec 31  1969 subsystem -> ../../../../../bus/i2c
> --w------- 1 root root 4096 Dec 31  1969 uevent
> 
> /sys/class/hwmon/hwmon1/device/lm75:
> total 0
> -r--r--r-- 1 root root 4096 Dec 31  1969 temp1_input
> -rw-r--r-- 1 root root 4096 Dec 31  1969 temp1_max
> -rw-r--r-- 1 root root 4096 Dec 31  1969 temp1_max_hyst


But this one does not! The attributes are in a subdirectory ("lm75")
instead of being directly in the device's directory. libsensors doesn't
expect this and fails. The lm75 driver in the vanilla kernel does NOT
do this, so I suspect that you're using a modified driver.

-- 
Jean Delvare

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Re: [lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Michael Brian Willis]

On Tue, 2007-11-06 at 22:51 +0100, Jean Delvare wrote:
> Unrelated to your problem, but it seems to me that your clock is slightly off ;)
Just slightly :) I just haven't set up my ntp server yet. 

> But this one does not! The attributes are in a subdirectory ("lm75")
> instead of being directly in the device's directory. libsensors doesn't
> expect this and fails. The lm75 driver in the vanilla kernel does NOT
> do this, so I suspect that you're using a modified driver.
I am using the LM75 driver that comes with the Denx embedded linux
kernel. I found the place in the LM75 driver (drivers/hwmon/lm75.c)
where it specifies the attributes to be placed in a separate folder: 

static const struct attribute_group lm75_group = {
	
	//don't put attritube files in a separate folder
	//.name  = "lm75",
	.attrs = lm75_attributes,
};

Commenting out the .name line fixes the problem and I can now read
temperature data from the LM75. 

Thank you so much for all of your help! I'm very glad to get this issue
resolved. 

Regards, 

Michael Willis
Applied Research Labs - University of Texas
willis <at> arlut . utexas . edu






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Re: [lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Jean Delvare]

Hi Michael,

On Tue, 06 Nov 2007 18:45:06 -0600, Michael Brian Willis wrote:
> On Tue, 2007-11-06 at 22:51 +0100, Jean Delvare wrote:
> > Unrelated to your problem, but it seems to me that your clock is slightly off ;)
> Just slightly :) I just haven't set up my ntp server yet. 
> 
> > But this one does not! The attributes are in a subdirectory ("lm75")
> > instead of being directly in the device's directory. libsensors doesn't
> > expect this and fails. The lm75 driver in the vanilla kernel does NOT
> > do this, so I suspect that you're using a modified driver.
> I am using the LM75 driver that comes with the Denx embedded linux
> kernel. I found the place in the LM75 driver (drivers/hwmon/lm75.c)
> where it specifies the attributes to be placed in a separate folder: 
> 
> static const struct attribute_group lm75_group = {
> 	
> 	//don't put attritube files in a separate folder
> 	//.name  = "lm75",
> 	.attrs = lm75_attributes,
> };
> 
> Commenting out the .name line fixes the problem and I can now read
> temperature data from the LM75. 
> 
> Thank you so much for all of your help! I'm very glad to get this issue
> resolved. 

Glad to know. That's really weird from Denx to have done that, as it
breaks lm-sensors as you can see, and I fail to see what advantage
there can be to have the attributes in a subfolder anyway. Feel free to
complain loudly to them for wasting everybody's time.

-- 
Jean Delvare

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Re: [lm-sensors] LM75: "ERROR: Can't get temperature data!"

[Heiko Schocher]

Hello Jean,

 >On Fri, 9 Nov 2007 14:19:02 +0100 Jean Delvare wrote:
 > >On Tue, 06 Nov 2007 18:45:06 -0600, Michael Brian Willis wrote:
 > >
 > > static const struct attribute_group lm75_group = {
 > > 	
 > > 	//don't put attritube files in a separate folder
 > > 	//.name  = "lm75",
 > > 	.attrs = lm75_attributes,
 > > };
 > >
 > > Commenting out the .name line fixes the problem and I can now read
 > > temperature data from the LM75.
 > >
 > > Thank you so much for all of your help! I'm very glad to get this issue
 > > resolved.
 >
 > Glad to know. That's really weird from Denx to have done that, as it
 > breaks lm-sensors as you can see, and I fail to see what advantage
 > there can be to have the attributes in a subfolder anyway. Feel free to
 > complain loudly to them for wasting everybody's time.

fixed this issue in the Denx Kernel, see:

http://www.denx.de/cgi-bin/gitweb.cgi?p=linux-2.6-denx.git;a=commitdiff;h‘89b567f940d2e83d7f1d98321c80435c63ce97;hp\x0572f7b6d74b241558b63895ea9da9744b24e8a8

thanks
Heiko
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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