SystemError: initialization of _libsoc raised unreported exception
Closed this issue · 9 comments
jflorian commented
Hi! I'm trying this out as a hopeful workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1471731 on Fedora 27 with a RPi 3. I didn't get very far though, perhaps for the same reasons:
Python 3.6.4 (default, Jan 23 2018, 21:49:59)
[GCC 7.2.1 20170915 (Red Hat 7.2.1-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
Tab completion has been enabled.
>>> from libsoc import gpio
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.6/site-packages/libsoc/__init__.py", line 1, in <module>
from ._libsoc import * # NOQA
SystemError: initialization of _libsoc raised unreported exception
This is with:
python3-libsoc-0.8.2-6.fc27.armv7hl
libsoc-0.8.2-6.fc27.armv7hl
Any ideas?
jackmitch commented
Can you try building the latest master, there have been some Python improvements recently which may fix this issue. It would also rule out issues in the packaging.
jflorian commented
Certainly. Stupid Q: All is now installed in /usr/local, how do I test? I removed the stock Fedora rpms, just to be certain. Then...
$ export PYTHONPATH=/usr/local/lib/python3.6/site-packages/
$ python3
Python 3.6.4 (default, Jan 23 2018, 21:49:59)
[GCC 7.2.1 20170915 (Red Hat 7.2.1-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
Tab completion has been enabled.
>>> from libsoc import gpio
'CDLL' function call to load 'libsoc.so.2' failed:
Traceback (most recent call last):
File "/usr/lib/python3.6/ctypes/__init__.py", line 343, in __init__
self._handle = _dlopen(self._name, mode)
OSError: libsoc.so.2: cannot open shared object file: No such file or directory
(I just realized that the last time I compiled any C code was probably in the 90s. Also, I've only ever done pure-Python modules in non-std locations. I feel old and dumb .)
jackmitch commented
I would also set LD_LIBRARY_PATH, i.e.
export LD_LIBRARY_PATH=/usr/local/lib
That should allow it to pick up the installed library in the /usr/local/ directory.
jflorian commented
Ah, that's right! I can successfully import gpio from libsoc. Now I just need to look at your code examples a bit more and adapt my program to this module. Do we know enough yet that I should file a bug against the packaging? (It would seem so to me.)
jflorian commented
Hmmm... not sure if this actually working or not. I'm trying to strobe an output for a simple, obvious "sign of life" using:
from libsoc import gpio
from time import sleep
gpio.GPIO.set_debug(True)
gout = gpio.GPIO(26, gpio.DIRECTION_OUTPUT)
def strobe():
while True:
gout.set_high()
sleep(1)
gout.set_low()
sleep(1)
strobe()I have a volt meter on pins 37 (GPIO 26) and 39 on my Pi 3 and I see 0V steady. Remembering that there's physical pin numbering and GPIO numbering, I guessed I might simply be on the wrong output pin (though the package name suggests otherwise). I kept my ground at 39 and hunted around the other pins looking for the tell-tale strobe but found all other pins in a steady state while the above was running.
I then added the set_debug() line and ran again. This, I think, revealed a clue. I now see libsoc-gpio-debug: invalid gpio pointer (NULL, libsoc_gpio_set_level) once a second.
So what's my step?
jackmitch commented
All the python code was a contribution so I'm not overly clued up on it, but from the examples in the test directory:
https://github.com/jackmitch/libsoc/blob/master/test/gpio_test.py
You can see that there is a request function, I would try:
gpio.request_gpios((gout))
You can also run the whole test by looping two pins together and setting the correct GPIO_IN and GPIO_OUT environment variables as specifed in the test.
jflorian commented
Oops, I missed that function call. Okay, for now I'll stick with gpio_test.py since that's a better reference test, especially now that I know how to use it.
# export GPIO_IN=17
# export GPIO_OUT=27
# python3 test/gpio_test.py
libsoc-file-debug: No such file or directory
Traceback (most recent call last):
File "test/gpio_test.py", line 86, in <module>
main(gpio_input_id, gpio_output_id)
File "test/gpio_test.py", line 54, in main
with gpio.request_gpios((gpio_in, gpio_out)):
File "/usr/lib/python3.6/contextlib.py", line 81, in __enter__
return next(self.gen)
File "/usr/local/lib/python3.6/site-packages/libsoc/gpio.py", line 155, in request_gpios
g.open()
File "/usr/local/lib/python3.6/site-packages/libsoc/gpio.py", line 57, in open
raise IOError('Unable to open GPIO_%d' % self.id)
OSError: Unable to open GPIO_17
# ls -l /dev/gpiochip0
crw-------. 1 root root 254, 0 Jul 12 2017 /dev/gpiochip0
# whoami
root
I'm only able to partly read C code but looking at libsoc_gpio_request I see references to /sys/class/gpio.... On my device no such path exists. Instead, here's what I have:
# find /sys | grep gpio
/sys/kernel/debug/gpio
/sys/kernel/debug/pinctrl/3f200000.gpio
/sys/kernel/debug/pinctrl/3f200000.gpio/pinconf-config
/sys/kernel/debug/pinctrl/3f200000.gpio/pinconf-groups
/sys/kernel/debug/pinctrl/3f200000.gpio/pinconf-pins
/sys/kernel/debug/pinctrl/3f200000.gpio/pinmux-pins
/sys/kernel/debug/pinctrl/3f200000.gpio/pinmux-functions
/sys/kernel/debug/pinctrl/3f200000.gpio/gpio-ranges
/sys/kernel/debug/pinctrl/3f200000.gpio/pingroups
/sys/kernel/debug/pinctrl/3f200000.gpio/pins
/sys/devices/platform/soc/3f200000.gpio
/sys/devices/platform/soc/3f200000.gpio/subsystem
/sys/devices/platform/soc/3f200000.gpio/driver
/sys/devices/platform/soc/3f200000.gpio/power
/sys/devices/platform/soc/3f200000.gpio/power/runtime_suspended_time
/sys/devices/platform/soc/3f200000.gpio/power/autosuspend_delay_ms
/sys/devices/platform/soc/3f200000.gpio/power/runtime_active_time
/sys/devices/platform/soc/3f200000.gpio/power/control
/sys/devices/platform/soc/3f200000.gpio/power/runtime_status
/sys/devices/platform/soc/3f200000.gpio/gpiochip0
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/subsystem
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/power
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/power/runtime_suspended_time
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/power/autosuspend_delay_ms
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/power/runtime_active_time
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/power/control
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/power/runtime_status
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/dev
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/uevent
/sys/devices/platform/soc/3f200000.gpio/gpiochip0/of_node
/sys/devices/platform/soc/3f200000.gpio/driver_override
/sys/devices/platform/soc/3f200000.gpio/modalias
/sys/devices/platform/soc/3f200000.gpio/uevent
/sys/devices/platform/soc/3f200000.gpio/of_node
/sys/firmware/devicetree/base/soc/gpio@7e200000
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio14
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio14/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio14/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio14/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio5
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio5/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio5/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio5/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio30
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio30/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio30/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio30/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio16
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio16/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio16/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio16/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio32
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio32/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio32/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio32/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio32/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio32/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/compatible
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio4
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio4/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio4/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio4/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/alt0
/sys/firmware/devicetree/base/soc/gpio@7e200000/alt0/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/alt0/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/alt0/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio42
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio42/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio42/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio42/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk0_gpio4
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk0_gpio4/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk0_gpio4/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk0_gpio4/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio12
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio12/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio12/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio12/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio19
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio19/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio19/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio19/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio40
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio40/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio40/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio40/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio40/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio40/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio43
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio43/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio43/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio43/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio43/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio43/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio30
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio30/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio30/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_ctsrts_gpio30/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpioout
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpioout/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpioout/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpioout/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio35
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio35/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio35/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio35/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio45
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio45/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio45/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio45/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio45/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio45/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio28
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio28/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio28/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio28/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpio-controller
/sys/firmware/devicetree/base/soc/gpio@7e200000/dpi_gpio0
/sys/firmware/devicetree/base/soc/gpio@7e200000/dpi_gpio0/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/dpi_gpio0/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/dpi_gpio0/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio0
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio0/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio0/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio0/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio0/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio0/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio18
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio18/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio18/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pcm_gpio18/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio13
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio13/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio13/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio13/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/#interrupt-cells
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio41
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio41/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio41/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm1_gpio41/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/interrupts
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio7
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio7/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio7/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi0_gpio7/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio44
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio44/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio44/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio44/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio28
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio28/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio28/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio28/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c_slave_gpio18
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c_slave_gpio18/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c_slave_gpio18/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c_slave_gpio18/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio48
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio48/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio48/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio48/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio2
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio2/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio2/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio2/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio2/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c1_gpio2/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio38
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio38/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio38/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio38/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi1_gpio16
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi1_gpio16/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi1_gpio16/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi1_gpio16/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio22
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio22/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio22/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/jtag_gpio22/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi2_gpio40
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi2_gpio40/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi2_gpio40/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/spi2_gpio40/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio44
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio44/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio44/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/i2c0_gpio44/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/reg
/sys/firmware/devicetree/base/soc/gpio@7e200000/#gpio-cells
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio16
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio16/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio16/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_ctsrts_gpio16/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio6
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio6/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio6/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk2_gpio6/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/sdhost_gpio48
/sys/firmware/devicetree/base/soc/gpio@7e200000/sdhost_gpio48/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/sdhost_gpio48/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/sdhost_gpio48/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/sdhost_gpio48/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/sdhost_gpio48/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34/brcm,pull
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio34/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio44
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio44/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio44/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio44/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio14
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio14/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio14/phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio14/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio14/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio14/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio36
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio36/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio36/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart0_gpio36/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/linux,phandle
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio32
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio32/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio32/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio32/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio18
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio18/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio18/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/pwm0_gpio18/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio42
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio42/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio42/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/gpclk1_gpio42/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio40
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio40/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio40/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/uart1_gpio40/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio22
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio22/brcm,pins
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio22/brcm,function
/sys/firmware/devicetree/base/soc/gpio@7e200000/emmc_gpio22/name
/sys/firmware/devicetree/base/soc/gpio@7e200000/pinctrl-names
/sys/firmware/devicetree/base/soc/gpio@7e200000/interrupt-controller
/sys/firmware/devicetree/base/leds/act/gpios
/sys/bus/platform/devices/3f200000.gpio
/sys/bus/platform/drivers/poweroff-gpio
/sys/bus/platform/drivers/poweroff-gpio/bind
/sys/bus/platform/drivers/poweroff-gpio/unbind
/sys/bus/platform/drivers/poweroff-gpio/uevent
/sys/bus/platform/drivers/tegra-gpio
/sys/bus/platform/drivers/tegra-gpio/bind
/sys/bus/platform/drivers/tegra-gpio/unbind
/sys/bus/platform/drivers/tegra-gpio/uevent
/sys/bus/platform/drivers/gpio-mxc
/sys/bus/platform/drivers/gpio-mxc/uevent
/sys/bus/platform/drivers/stmpe-gpio
/sys/bus/platform/drivers/stmpe-gpio/uevent
/sys/bus/platform/drivers/mvebu-gpio
/sys/bus/platform/drivers/mvebu-gpio/bind
/sys/bus/platform/drivers/mvebu-gpio/unbind
/sys/bus/platform/drivers/mvebu-gpio/uevent
/sys/bus/platform/drivers/leds-gpio
/sys/bus/platform/drivers/leds-gpio/bind
/sys/bus/platform/drivers/leds-gpio/leds
/sys/bus/platform/drivers/leds-gpio/unbind
/sys/bus/platform/drivers/leds-gpio/module
/sys/bus/platform/drivers/leds-gpio/uevent
/sys/bus/platform/drivers/omap_gpio
/sys/bus/platform/drivers/omap_gpio/bind
/sys/bus/platform/drivers/omap_gpio/unbind
/sys/bus/platform/drivers/omap_gpio/uevent
/sys/bus/platform/drivers/restart-gpio
/sys/bus/platform/drivers/restart-gpio/bind
/sys/bus/platform/drivers/restart-gpio/unbind
/sys/bus/platform/drivers/restart-gpio/uevent
/sys/bus/platform/drivers/pinctrl-bcm2835/3f200000.gpio
/sys/bus/platform/drivers/tps6586x-gpio
/sys/bus/platform/drivers/tps6586x-gpio/bind
/sys/bus/platform/drivers/tps6586x-gpio/unbind
/sys/bus/platform/drivers/tps6586x-gpio/uevent
/sys/bus/platform/drivers/gpio-xilinx
/sys/bus/platform/drivers/gpio-xilinx/bind
/sys/bus/platform/drivers/gpio-xilinx/unbind
/sys/bus/platform/drivers/gpio-xilinx/uevent
/sys/bus/platform/drivers/pxa-gpio
/sys/bus/platform/drivers/pxa-gpio/bind
/sys/bus/platform/drivers/pxa-gpio/unbind
/sys/bus/platform/drivers/pxa-gpio/uevent
/sys/bus/platform/drivers/gpio-clk
/sys/bus/platform/drivers/gpio-clk/bind
/sys/bus/platform/drivers/gpio-clk/unbind
/sys/bus/platform/drivers/gpio-clk/uevent
/sys/bus/platform/drivers/tps65910-gpio
/sys/bus/platform/drivers/tps65910-gpio/bind
/sys/bus/platform/drivers/tps65910-gpio/unbind
/sys/bus/platform/drivers/tps65910-gpio/uevent
/sys/bus/platform/drivers/palmas-gpio
/sys/bus/platform/drivers/palmas-gpio/bind
/sys/bus/platform/drivers/palmas-gpio/unbind
/sys/bus/platform/drivers/palmas-gpio/uevent
/sys/bus/platform/drivers/basic-mmio-gpio
/sys/bus/platform/drivers/basic-mmio-gpio/bind
/sys/bus/platform/drivers/basic-mmio-gpio/unbind
/sys/bus/platform/drivers/basic-mmio-gpio/uevent
/sys/bus/gpio
/sys/bus/gpio/drivers_probe
/sys/bus/gpio/devices
/sys/bus/gpio/devices/gpiochip0
/sys/bus/gpio/uevent
/sys/bus/gpio/drivers
/sys/bus/gpio/drivers_autoprobe
/sys/bus/amba/drivers/pl061_gpio
/sys/bus/amba/drivers/pl061_gpio/bind
/sys/bus/amba/drivers/pl061_gpio/unbind
/sys/bus/amba/drivers/pl061_gpio/uevent
/sys/module/leds_gpio
/sys/module/leds_gpio/notes
/sys/module/leds_gpio/notes/.note.gnu.build-id
/sys/module/leds_gpio/taint
/sys/module/leds_gpio/initsize
/sys/module/leds_gpio/initstate
/sys/module/leds_gpio/coresize
/sys/module/leds_gpio/refcnt
/sys/module/leds_gpio/sections
/sys/module/leds_gpio/sections/.note.gnu.build-id
/sys/module/leds_gpio/sections/.exit.text
/sys/module/leds_gpio/sections/__mcount_loc
/sys/module/leds_gpio/sections/.init.text
/sys/module/leds_gpio/sections/.gnu.linkonce.this_module
/sys/module/leds_gpio/sections/.ARM.exidx
/sys/module/leds_gpio/sections/.strtab
/sys/module/leds_gpio/sections/.rodata.str1.1
/sys/module/leds_gpio/sections/.text
/sys/module/leds_gpio/sections/.ARM.exidx.exit.text
/sys/module/leds_gpio/sections/.data
/sys/module/leds_gpio/sections/.symtab
/sys/module/leds_gpio/sections/.rodata
/sys/module/leds_gpio/sections/.ARM.exidx.init.text
/sys/module/leds_gpio/holders
/sys/module/leds_gpio/uevent
/sys/module/leds_gpio/drivers
/sys/module/leds_gpio/drivers/platform:leds-gpio
jackmitch commented
This means that you don't have the sysfs gpio subsystem enabled in your kernel.
[jack@arch-corsair ~]$ zcat /proc/config.gz | grep GPIO_SYSFS
CONFIG_GPIO_SYSFS=y
You need to either enable this in your kernel, or you could try using the new subsystem replacement. There is a different library for this already, but I haven't yet implemented support in libsoc.
https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/
jflorian commented
Ah, well that explains it. I knew one interface was being obsoleted by another, but I wasn't clear which is which ... or which I have. Being Fedora, the newer one is more likely and the loss of the old one is probably why I could no longer use the well known RPi.GPIO. I guess I need to keep looking around some more as my whole quest is to use something that doesn't take a lot of effort to get going.
BTW, thanks for the helpful feedback!