I'm having trouble using devfs_register() with a driver i'm writing
for a 2.4.23 kernel.
Quoting fs/devfs/base.c, the last argument to devfs_register() is
@info: An arbitrary pointer which will be written to the @private_data
field of the &file structure passed to the device driver. You can set
this to whatever you like, and change it once the file is opened (the next
file opened will not see this change).
so, i have a private structure in my driver file,
struct my_privfile_s {
int data1;
int data2;
} my_privinfo ;
my_privinfo.data1 = 5;
my_privinfo.data2 = 25;
and in the devfs_register call, i set the last argument to &my_privinfo;
and in the open call of my driver, i have
static int fop_open (struct inode * inode, struct file * filep){
struct my_privfile_s *info = (struct my_privfile_s *) filep;
printk ("testing: data1 is %d, data2 is %d\n", info->data1, info->data2);
<more code follows>
};
But the kernel doesn't print out the expected results! What am i doing wrong?
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