Thank you very much Jonathan :) This works now. I tried it before and failed to make my own dummy directory because I missed mount -t configfs none /config A few days before I followed this instructions: https://kernelnewbies.org/IIO_tasks and it didn’t work. That was because of the missing mount command. Thanks, Franziska > Am 05.06.2017 um 21:46 schrieb Jonathan Cameron <jic23@xxxxxxxxxxxxxxxxxxxxx>: > > Hi Francis > > Change was made from just creating one dummy instance, to providing a configfs entry to > create them on demand. > > https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/drivers/iio/dummy/iio_simple_dummy.c?h=testing&id=3d85fb6f81046b51e4428e14fb9643ea75648630 > > The commit log talks about how to create them. > You will need configfs mounted though if it is not already. > > mount -t configfs none /config > > Putting back old code would have gone back to old creation method. > > Jonathan > > > > > On 5 June 2017 18:41:39 BST, "Franziska Näpelt" <franziska.naepelt@xxxxxxxxxxxxxx> wrote: >> I just tried to use the kernel 4.4 iio dummy module and compiled it >> against kernel 4.9. >> This works and creates an entry in sysfs. >> >> To prevent dependencies I made an >> #undef CONFIG_IIO_SIMPLE_DUMMY_BUFFER >> >>> Am 05.06.2017 um 16:33 schrieb Franziska Näpelt >> <franziska.naepelt@xxxxxxxxxxxxxx>: >>> >>> Hi, >>> >>> I’m just playing around with iio dummy drivers and couldn’t get it >> work with kernel 4.9 while everything was fine with >>> kernel 4.4. >>> >>> Steps for kernel 4.4: >>> * edit Kconfig to create IIO_SIMPLE_DUMMY module >>> * build and install kernel >>> * edit /etc/modules to load iio_dummy >>> * after reboot there is an iio_dummy module loaded and the device >> appears in sysfs >>> >>> Steps for kernel 4.9: >>> * edit Kconfig to create IIO_SW_DEVICE, IIO_SIMPLE_DUMMY, >> IIO_SIMPLE_DUMMY_BUFFER modules >>> * build and install kernel >>> * edit /etc/modules to load iio_dummy >>> * after reboot there is an iio_dummy module loaded but doesn’t appear >> in sysfs >>> >>> Is there something wrong with the order, loading modules or do I miss >> some dependencies? >>> >>> Thanks, >>> Franziska >>> >>> Here are some more detailed information, as first kernel 4.4, then >> 4.9: >>> >>> Linux raspberrypi-3 4.4.50-v7+ #1 SMP Fri Jun 2 00:19:42 CEST 2017 >> armv7l GNU/Linux >>> --- >>> pi@raspberrypi-3:~/projects $ cat /etc/modules >>> # /etc/modules: kernel modules to load at boot time. >>> # >>> # This file contains the names of kernel modules that should be >> loaded >>> # at boot time, one per line. Lines beginning with "#" are ignored. >>> >>> iio_dummy >>> --- >>> pi@raspberrypi-3:~/projects/raspi-linux $ git diff >> drivers/staging/iio/Kconfig >>> diff --git a/drivers/staging/iio/Kconfig >> b/drivers/staging/iio/Kconfig >>> index 9d7f000..42d03a3 100644 >>> --- a/drivers/staging/iio/Kconfig >>> +++ b/drivers/staging/iio/Kconfig >>> @@ -23,6 +23,7 @@ config IIO_DUMMY_EVGEN >>> >>> config IIO_SIMPLE_DUMMY >>> tristate "An example driver with no hardware requirements" >>> + default y >>> help >>> Driver intended mainly as documentation for how to write >>> a driver. May also be useful for testing userspace code >>> --- >>> pi@raspberrypi-3:~/projects $ lsmod >>> Module Size Used by >>> bnep 10340 2 >>> hci_uart 17943 1 >>> btbcm 5929 1 hci_uart >>> bluetooth 326067 22 bnep,btbcm,hci_uart >>> brcmfmac 186282 0 >>> brcmutil 5661 1 brcmfmac >>> cfg80211 428833 1 brcmfmac >>> rfkill 16018 4 cfg80211,bluetooth >>> snd_bcm2835 20447 0 >>> snd_pcm 75890 1 snd_bcm2835 >>> snd_timer 19288 1 snd_pcm >>> bcm2835_gpiomem 2976 0 >>> snd 51908 3 snd_bcm2835,snd_timer,snd_pcm >>> bcm2835_wdt 3225 0 >>> uio_pdrv_genirq 3164 0 >>> uio 8000 1 uio_pdrv_genirq >>> iio_dummy 3072 0 >>> industrialio 33826 1 iio_dummy >>> ipv6 347563 32 >>> --- >>> pi@raspberrypi-3:/sys/bus/iio/devices/iio:device0 $ ll >>> insgesamt 0 >>> drwxr-xr-x 3 root root 0 Jun 4 13:42 . >>> drwxr-xr-x 10 root root 0 Jun 4 13:42 .. >>> -r--r--r-- 1 root root 4,0K Jun 4 13:42 dev >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_accel_x_calibbias >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_accel_x_calibscale >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_accel_x_raw >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_activity_running_input >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_activity_walking_input >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_sampling_frequency >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_steps_calibheight >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_steps_en >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_steps_input >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage0_offset >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage0_raw >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage0_scale >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage1-voltage2_raw >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage3-voltage4_raw >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage-voltage_scale >>> -r--r--r-- 1 root root 4,0K Jun 4 13:42 name >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 out_voltage0_raw >>> drwxr-xr-x 2 root root 0 Jun 4 13:42 power >>> lrwxrwxrwx 1 root root 0 Jun 4 13:42 subsystem -> ../../bus/iio >>> -rw-r--r-- 1 root root 4,0K Jun 4 13:42 uevent >>> >> ------------------------------------------------------------------------------------------------------------------------- >>> Linux raspberrypi-3 4.9.30-v7+ #1 SMP Sun Jun 4 21:07:31 CEST 2017 >> armv7l GNU/Linux >>> --- >>> /etc/modules -> is the same >>> --- >>> pi@raspberrypi-3:~/projects/raspi-linux $ git diff >> drivers/iio/Kconfig >>> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig >>> index 6743b18..e804f63 100644 >>> --- a/drivers/iio/Kconfig >>> +++ b/drivers/iio/Kconfig >>> @@ -49,6 +49,7 @@ config IIO_CONSUMERS_PER_TRIGGER >>> config IIO_SW_DEVICE >>> tristate "Enable software IIO device support" >>> select IIO_CONFIGFS >>> + default y >>> help >>> Provides IIO core support for software devices. A software >>> device can be created via configfs or directly by a driver >>> --- >>> pi@raspberrypi-3:~/projects/raspi-linux $ git diff >> drivers/iio/dummy/Kconfig >>> diff --git a/drivers/iio/dummy/Kconfig b/drivers/iio/dummy/Kconfig >>> index aa5824d..1eb7991 100644 >>> --- a/drivers/iio/dummy/Kconfig >>> +++ b/drivers/iio/dummy/Kconfig >>> @@ -11,6 +11,7 @@ config IIO_DUMMY_EVGEN >>> config IIO_SIMPLE_DUMMY >>> tristate "An example driver with no hardware requirements" >>> depends on IIO_SW_DEVICE >>> + default y >>> help >>> Driver intended mainly as documentation for how to write >>> a driver. May also be useful for testing userspace code >>> @@ -29,6 +30,7 @@ config IIO_SIMPLE_DUMMY_BUFFER >>> select IIO_BUFFER >>> select IIO_TRIGGER >>> select IIO_KFIFO_BUF >>> + default y >>> help >>> Add buffered data capture to the simple dummy driver. >>> --- >>> pi@raspberrypi-3:~/projects/raspi-linux $ lsmod >>> Module Size Used by >>> bnep 12051 2 >>> hci_uart 20020 1 >>> btbcm 7916 1 hci_uart >>> bluetooth 365473 22 hci_uart,bnep,btbcm >>> brcmfmac 222798 0 >>> brcmutil 9092 1 brcmfmac >>> cfg80211 542989 1 brcmfmac >>> rfkill 20832 4 bluetooth,cfg80211 >>> snd_bcm2835 24427 0 >>> snd_pcm 98565 1 snd_bcm2835 >>> snd_timer 23904 1 snd_pcm >>> bcm2835_gpiomem 3940 0 >>> snd 70032 3 snd_timer,snd_bcm2835,snd_pcm >>> uio_pdrv_genirq 3923 0 >>> fixed 3285 0 >>> uio 10268 1 uio_pdrv_genirq >>> iio_dummy 4984 0 >>> industrialio_sw_device 3691 1 iio_dummy >>> industrialio_configfs 1370 1 industrialio_sw_device >>> kfifo_buf 3668 1 iio_dummy >>> industrialio 62929 2 iio_dummy,kfifo_buf >>> ipv6 408530 32 >>> --- >>> pi@raspberrypi-3:/sys/bus/iio/devices $ ll >>> insgesamt 0 >>> drwxr-xr-x 2 root root 0 Jun 5 15:33 . >>> drwxr-xr-x 4 root root 0 Jun 5 15:33 .. >>> >>> >>> >>> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-iio" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > Sent from my Android device with K-9 Mail. 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