On Tue, Jan 22, 2019 at 11:33:18PM +0530, Bharath Vedartham wrote:
Hey everyone,
I am trying to get started with the IIO subsystem by doing the following tasks:
https://kernelnewbies.org/IIO_tasks
In task 3, which requires us to add 3 channels to the dummy_device, I have added the structures in the dummy_channels array(which is of type struct chan_spec), similar to the other channels in the dummy_channels array.(in file drivers/iio/dummy/iio_simple_dummy.c)
I also added elements to the enum iio_simple_dummy_scan_elements for the scan_index val.(in iio_simple_dummy.h)
I recompiled the kernel and loaded the modules iio_dummy and iio_dummy_evgen using modprobe.
is the right approach. I am not able to see any new channels being added to my /sys/bus/iio/devices/iio:device0/ directory?
Did you followed the configfs setup as illustrated in the aforementioned link ? Did the modules got loaded correctly ? And if you're doing Task 3, I'd assume that the previous tasks were done correctly ?
printk is not printing to dmesg. I put printk in the probe function
Without any logs or diffs, it's hard to predict about where exactly you're doing wrong. Btw, we do have a IIO mailing list as well: linux-iio@vger.kernel.org -- Himanshu Jha Undergraduate Student Department of Electronics & Communication Guru Tegh Bahadur Institute of Technology