mcp3422.ko Kernel module

[mypiandrew]

Hi

Would it be possible to include a mcp3422.ko file as part of the standard build (in a similar fashion to the can bus mcp251x.ko please?

[pelwell]

CONFIG_MCP3422=m is the required setting. The module is only 10KB.

@popcornmix?

[popcornmix]

Sounds okay. Will add.

[popcornmix]

This is in latest rpi-update firmware.
@mypiandrew please test and close if happy.

[mypiandrew]

Hi, Wow that was quick!

I'm probably doing something silly here, but have done rpi-update which ran sucessfully (still running on Wheezy at the moment)

Can't get the modules to install :

I'm using a crib from steps 10 & 11 here : https://github.com/angeloc/linux_iio_mcp3422

root@raspberrypi:/# uname -a
Linux raspberrypi 4.1.19+ #853 Wed Mar 9 18:04:48 GMT 2016 armv6l GNU/Linux

root@raspberrypi:/# insmod /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko
Error: could not insert module /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko: Unknown symbol in module

root@raspberrypi:/# insmod /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp320x.ko
Error: could not insert module /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp320x.ko: Unknown symbol in module

Not sure why there are two different .ko files in that directory, was only expecting one - but then kernel modules is not my forte to be honest

Just for fun I tried the other module area :

root@raspberrypi:/# insmod /lib/modules/4.1.19-v7+/kernel/drivers/iio/adc/mcp3422.ko
Error: could not insert module /lib/modules/4.1.19-v7+/kernel/drivers/iio/adc/mcp3422.ko: Invalid module format

That's expected I guess as I'm not running that kernel

This then didn't work (kind of expected as there's no driver module loaded)

root@raspberrypi:/# echo mcp3424 0x6e > /sys/bus/i2c/devices/i2c-1/new_device
-bash: echo: write error: Invalid argument

This might be helpful :

root@raspberrypi:/# dmesg | tail -15
[ 429.131954] mcp3422: Unknown symbol devm_iio_device_register (err 0)
[ 447.545108] mcp320x: Unknown symbol devm_iio_device_alloc (err 0)
[ 447.545177] mcp320x: Unknown symbol iio_device_unregister (err 0)
[ 447.545208] mcp320x: Unknown symbol iio_device_register (err 0)
[ 485.289733] i2c i2c-1: Failed to register i2c client mcp3424 at 0x6e (-16)
[ 533.166576] i2c i2c-1: Failed to register i2c client mcp3424 at 0x6e (-16)
[ 554.283738] i2c i2c-1: Failed to register i2c client mcp3424 at 0x6e (-16)
[ 569.320659] mcp3422: disagrees about version of symbol module_layout
[ 606.009641] mcp3422: Unknown symbol devm_iio_device_alloc (err 0)
[ 606.009697] mcp3422: Unknown symbol devm_iio_device_register (err 0)
[ 778.460881] mcp320x: Unknown symbol devm_iio_device_alloc (err 0)
[ 778.460949] mcp320x: Unknown symbol iio_device_unregister (err 0)
[ 778.460981] mcp320x: Unknown symbol iio_device_register (err 0)
[ 937.631274] mcp3422: Unknown symbol devm_iio_device_alloc (err 0)
[ 937.631327] mcp3422: Unknown symbol devm_iio_device_register (err 0)

The last 2 were generated by running :

insmod /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko

Any ideas as to what's not happening here ?

[popcornmix]

Does this work for you:

pi@domnfs:~ $ sudo modprobe mcp3422
pi@domnfs:~ $ lsmod
Module                  Size  Used by
mcp3422                 3979  0 
industrialio           34435  1 mcp3422
rpcsec_gss_krb5        21204  0 
joydev                  9024  0 
evdev                  10278  6 
brcmfmac              177635  0 
brcmutil                5501  1 brcmfmac
cfg80211              407580  1 brcmfmac
rfkill                 16036  2 cfg80211
bcm2835_gpiomem         2860  0 
bcm2835_rng             1763  0 
uio_pdrv_genirq         2944  0 
uio                     7753  1 uio_pdrv_genirq
i2c_dev                 5671  0 
fuse                   80694  1 
ipv6                  338660  44 

[popcornmix]

I assume you rebooted after running rpi-update?
What does uname -a report?

[mypiandrew]

Yes I rebooted

root@raspberrypi:/# modprobe mcp3422
ERROR: could not insert 'mcp3422': Unknown symbol in module, or unknown parameter (see dmesg)

root@raspberrypi:/# uname -a
Linux raspberrypi 4.1.19+ #853 Wed Mar 9 18:04:48 GMT 2016 armv6l GNU/Linux

root@raspberrypi:/# dmesg | tail -5
[ 937.631274] mcp3422: Unknown symbol devm_iio_device_alloc (err 0)
[ 937.631327] mcp3422: Unknown symbol devm_iio_device_register (err 0)
[ 1222.438448] i2c i2c-1: Failed to register i2c client mcp3424 at 0x6e (-16)
[ 1321.081637] mcp3422: Unknown symbol devm_iio_device_alloc (err 0)
[ 1321.081690] mcp3422: Unknown symbol devm_iio_device_register (err 0)

[mypiandrew]

I'm still running Wheezy if that has any bearing on things?

[popcornmix]

Lets check with Pi1

pi@domnfs:~ $ uname -a
Linux domnfs 4.1.19+ #853 Wed Mar 9 18:04:48 GMT 2016 armv6l GNU/Linux
pi@domnfs:~ $ sudo modprobe mcp3422
pi@domnfs:~ $ lsmod
Module                  Size  Used by
mcp3422                 4965  0 
industrialio           45124  1 mcp3422
cfg80211              479279  0 
rfkill                 21508  1 cfg80211
joydev                  9320  0 
evdev                  10534  2 
bcm2835_gpiomem         3703  0 
bcm2835_rng             2207  0 
uio_pdrv_genirq         3526  0 
uio                    10078  1 uio_pdrv_genirq
i2c_dev                 6386  0 
fuse                   86348  1 
ipv6                  358811  28 

still seems okay. What does this report:

pi@domnfs:~ $ md5sum /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko
cd7a7db6b0608ed8658f0bfdd1e975ff  /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko

[mypiandrew]

I'm sorry about this, I didn't mean to cause trouble :(

[mypiandrew]

root@raspberrypi:/# md5sum /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko
cd7a7db6b0608ed8658f0bfdd1e975ff /lib/modules/4.1.19+/kernel/drivers/iio/adc/mcp3422.ko

[popcornmix]

Wheezy is no longer supported by us and I am on Jessie, but I can't think why that could cause a difference.

Can you try running sudo depmod and rebooting just to be sure.

[mypiandrew]

I already have a RTC present on the I2c
i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- 6e --
70: -- -- -- -- -- -- -- --

root@raspberrypi:/# lsmod
Module Size Used by
rtc_ds1307 10459 0
i2c_dev 6386 0
sg 20575 0
sierra 8968 0
ftdi_sio 32602 0
usbserial 29593 2 sierra,ftdi_sio
i2c_bcm2708 5988 0
spi_bcm2835 7868 0
bcm2835_gpiomem 3703 0
bcm2835_rng 2207 0
uio_pdrv_genirq 3526 0
uio 10078 1 uio_pdrv_genirq