copy_from_user_toio — copy data from user-space to mmio-space
int copy_from_user_toio
(volatile void __iomem * dst, const void __user * src, size_t count);
the destination pointer on mmio-space
the source pointer on user-space
the data size to copy in bytes
Copies the data from user-space to mmio-space.
Returns zero if successful, or non-zero on failure.