<div dir="ltr">Actually, I just realized that there is probably a way to look up the character device name with the file* that is passed in with the mmap call. Can anybody say how?</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 7, 2016 at 3:00 PM, Kenneth Adam Miller <span dir="ltr"><<a href="mailto:kennethadammiller@gmail.com" target="_blank">kennethadammiller@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I have a driver that manages three sets of identical data structures that differ only in address values. Currently, I pray that the device file to which I have callbacks mapped for the driver gets called sequentially, because there are pairs of mmap's that need to be made. I know that this isn't the most ideal way to do it, so I'm searching for a better way rather than to swap out the values on each method call. <br><br>There are several things I am aware of but for each one I have questions:<div>1) there are kernel module parameters</div><div>If I use kernel module parameters, I need to be able to insert the kernel module three times in order to have each one have a distinct set of global memory and mapped callbacks to distinct files. Can that be done? Second, I will need to compile the driver statically later. How can I pass those parameters that would otherwise be on the command line in statically?</div><div><br></div><div>2) I can compile the driver in three times with a compile time flag. This is the simplest and easiest, but it requires some buildroot and makefile foo that I think is a dirty hack.</div><div><br></div><div>3) I could have the init function create three separate files, since it is on init that I discover what my values are. But then I have to also associate identical functions that reference global variables in the kernel object. Duplicating the code would be worse that compiling the same code three times with a kernel parameter, even though that would help me solve my distinct globals problem. So how could I parameterisze a char device with data specific to the instance?</div></div>
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