On Tue, 6 Jun 2017 20:03:59 +0200 Franziska Naepelt <franziska.naepelt@xxxxxxxxxxxxxx> wrote: > 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 Alison, worth adding a note about mounting configfs to that page? Thanks, Jonathan > > > > 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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