jinumjoy
asked on
creating device nodes.
Hi,
I have a simple device driver which registers a dynamic major number. I would like my install rule in the Makefile to create the device nodes automatically by looking into /proc/devices.
I had referred some text on the net and came up with the below commands for my "install" rule in Makefile.
Makefile
=====
TARGET=abc.o
MODULE="abc-char"
.
.
install:
@insmod $(TARGET)
@major=`cat /proc/devices | grep $(MODULE) | awk '{print $$1}'`
@echo $$major
at this point (echo) i dont get the major number of the device, i get a blank. But if I execute the "cat /proc/devices..." as a command i do get the correct major number of the device.
creating device nodes is easy if i can get the major number from /proc/devices.
Can anyone please help me figure out the mistake i am doing or give some other way of doing the same.
cheers!
-Jinu
I have a simple device driver which registers a dynamic major number. I would like my install rule in the Makefile to create the device nodes automatically by looking into /proc/devices.
I had referred some text on the net and came up with the below commands for my "install" rule in Makefile.
Makefile
=====
TARGET=abc.o
MODULE="abc-char"
.
.
install:
@insmod $(TARGET)
@major=`cat /proc/devices | grep $(MODULE) | awk '{print $$1}'`
@echo $$major
at this point (echo) i dont get the major number of the device, i get a blank. But if I execute the "cat /proc/devices..." as a command i do get the correct major number of the device.
creating device nodes is easy if i can get the major number from /proc/devices.
Can anyone please help me figure out the mistake i am doing or give some other way of doing the same.
cheers!
-Jinu
ASKER
no sunnycoder $1 will not work.
$$1 is correct, but @major is not getting updated. I dont know what the problem is.
-Jinu
$$1 is correct, but @major is not getting updated. I dont know what the problem is.
-Jinu
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should perhaps be
@major=`cat /proc/devices | grep $(MODULE) | awk '{print $1}'`