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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