linux device driver - How to call compat_ioctl or unlocked_ioctl? -


i'm trying implement driver rtc (real time clock). used ioctl function in kernel 2.6.32. worked fine. when run same driver in kernel 3.13.0, gave error ‘struct file_operations’ has no member named ‘ioctl’

when changed ioctl unlocked_ioctl , compat_ioctl, compiled , moduled inserted.

but calling ioctl in user application not invoking ioctl function in module. function have use in user application invoke compat_ioctl or unlocked_ioctl?

check arguments in driver

define structure file operation definition like

static struct file_operations query_fops = {     .owner = this_module,     .open = my_open,     .release = my_close, #if (linux_version_code < kernel_version(2,6,35))     .ioctl = my_ioctl #else     .unlocked_ioctl = my_ioctl #endif };

define ioctl 

#if (linux_version_code < kernel_version(2,6,35)) static int my_ioctl(struct inode *i, struct file *f, unsigned int cmd, unsigned long arg) #else static long my_ioctl(struct file *f, unsigned int cmd, unsigned long arg)         #endif     {               switch(cmd){                 ....................................                 ...................................               }     }

and application level

no need modification can follow basic rule ioctl @ application level.


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