Hi, I wrote a driver and used IOCTL command. When I test my driver with a test application with root access the IOCTL cmd work fine. I notice when I declared my IOCTL command that I used the _IOR for all of them. Even the IOCTL command is a read (on register) or write. So I try to correct my mistake and wants to use _IOR for read command and _IOW for write command. For the write command, I got a error -25 (not a typewriter) so I don't understand why. I also try to change the _IOW to _IOWR but same mistake.
Someone can explain what is the problem, please ? Marcel.
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