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media: rc: introduce BPF_PROG_LIRC_MODE2

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Add support for BPF_PROG_LIRC_MODE2. This type of BPF program can call
rc_keydown() to reported decoded IR scancodes, or rc_repeat() to report
that the last key should be repeated.

The bpf program can be attached to using the bpf(BPF_PROG_ATTACH) syscall;
the target_fd must be the /dev/lircN device.

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Sean Young
2018-05-27 12:24:09 +01:00
committed by Daniel Borkmann
parent 170a7e3ea0
commit f4364dcfc8
10 changed files with 479 additions and 3 deletions
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30
drivers/media/rc/lirc_dev.c
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@@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/file.h>
#include <linux/idr.h>
#include <linux/poll.h>
#include <linux/sched.h>
@@ -104,6 +105,12 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
TO_US(ev.duration), TO_STR(ev.pulse));
}
/*
* bpf does not care about the gap generated above; that exists
* for backwards compatibility
*/
lirc_bpf_run(dev, sample);
spin_lock_irqsave(&dev->lirc_fh_lock, flags);
list_for_each_entry(fh, &dev->lirc_fh, list) {
if (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports)
@@ -816,4 +823,27 @@ void __exit lirc_dev_exit(void)
unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
}
struct rc_dev *rc_dev_get_from_fd(int fd)
{
struct fd f = fdget(fd);
struct lirc_fh *fh;
struct rc_dev *dev;
if (!f.file)
return ERR_PTR(-EBADF);
if (f.file->f_op != &lirc_fops) {
fdput(f);
return ERR_PTR(-EINVAL);
}
fh = f.file->private_data;
dev = fh->rc;
get_device(&dev->dev);
fdput(f);
return dev;
}
MODULE_ALIAS("lirc_dev");