On Mon, Nov 27, 2017 at 04:18:42PM +0100, Christophe LEROY wrote: > When registering a device node with device_create(), it is possible to pass > a drvdata pointer. > > How can I retrieve that drvdata pointer from the open() fops ? I've not been > able to find any exemple. You're not supposed to do it that way ... assuming you're talking about a character device, you embed the cdev in your own data structure and do this: struct my_struct *my = container_of(inode->i_cdev, struct my_struct, cdev); after calling: cdev_init(&my->cdev, &my_dev_fops); You'll use the drvdata when trying to go from the struct device to 'my_struct'. There's no struct device in struct cdev. I mean, you could probably get to it, but it's easier if you just do it the way that everybody else does it.
