This is useful when you want to handle the device entirely from BPF without exposing the automatic input nodes.
This is useful in case we want to have a third party program that directly talks to the hidraw node and we don't want regular input events to be emitted. This third party program can load a BPF program that instructs hid-generic to rebind on the device with hidraw only and then open the hidraw node itself.
When the application is closed, the BPF program is unloaded and the normal driver takes back the control of the device.
Signed-off-by: Benjamin Tissoires bentiss@kernel.org
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changes in v2: - rely on hdev->quirks instead of a new struct --- drivers/hid/hid-core.c | 2 ++ include/linux/hid.h | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index bf63e2819baf..35cefd7167aa 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2217,6 +2217,8 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask) connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV); if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE) connect_mask |= HID_CONNECT_HIDINPUT_FORCE; + if (hdev->quirks & HID_QUIRK_IGNORE_HIDINPUT) + connect_mask &= ~HID_CONNECT_HIDINPUT; if (hdev->bus != BUS_USB) connect_mask &= ~HID_CONNECT_HIDDEV; if (hid_hiddev(hdev)) diff --git a/include/linux/hid.h b/include/linux/hid.h index b3a9586363c9..b6bad03649f6 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -360,6 +360,7 @@ struct hid_item { * | @HID_QUIRK_HAVE_SPECIAL_DRIVER: * | @HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE: * | @HID_QUIRK_IGNORE_SPECIAL_DRIVER + * | @HID_QUIRK_IGNORE_HIDINPUT * | @HID_QUIRK_FULLSPEED_INTERVAL: * | @HID_QUIRK_NO_INIT_REPORTS: * | @HID_QUIRK_NO_IGNORE: @@ -386,6 +387,7 @@ struct hid_item { #define HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE BIT(20) #define HID_QUIRK_NOINVERT BIT(21) #define HID_QUIRK_IGNORE_SPECIAL_DRIVER BIT(22) +#define HID_QUIRK_IGNORE_HIDINPUT BIT(23) #define HID_QUIRK_FULLSPEED_INTERVAL BIT(28) #define HID_QUIRK_NO_INIT_REPORTS BIT(29) #define HID_QUIRK_NO_IGNORE BIT(30)