register_chrdev_region
cdev_add
	maybe one per device - but how to identify them?

or misc_register, misc_unregister
or register_blkdev
#include <linux/netdevice.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/skb.h>
#include <linux/can/error.h>
netdev_dbg
netdev_err
_probe
_remove
static const struct net_device_ops tss463aa_netdev_ops = {
	.ndo_start_xmit = tss463aa_tx,
	.ndo_change_mtu = tss463aa_change_mtu,
};
static struct rtnl_link_ops tss463aa_link_ops __read__mostly = {
	.kind = "???",
	.setup = tss463aa_setup,
};
rtnl_link_register(&tss463aa_link_ops);
// see vcan.c

INTERRUPT:

static irqreturn_t sample_interrupt(int irq, void* dev_id, struct pt_regs* regs) {
}
request_irq(NUMBER HERE, sample_interrupt, IRQF_DISABLED | IRQF_TRIGGER_FALLING/*flags*/, "gpio1EINT", dev_id);
// set_irq_type(NUMBER HERE, IRQT_FALLING);
/* not necessary enable_irq(NUMBER HERE); */
NUMBER HERE = BLAH_GPIO_IRQ(...)

OR:

/sys/class/gpio/xxx/uevent, edge, active_low, direction

OR:

poll(2) on "value" file and it will return if the interrupt was triggered.
	set the events POLLPRI | POLLERR
If using select
	exceptfds
then lseek(2) to the beginning of the file.

edge: use "falling". Possible: "none", "rising", "falling".