From: Benjamin Tissoires bentiss@kernel.org
[ Upstream commit 645c224ac5f6e0013931c342ea707b398d24d410 ]
We already have the possibility to force not binding to hid-generic and rely on a dedicated driver, but we couldn't do the other way around.
This is useful for BPF programs where we are fixing the report descriptor and the events, but want to avoid a specialized driver to come after BPF which would unwind everything that is done there.
Reviewed-by: Peter Hutterer peter.hutterer@who-t.net Link: https://patch.msgid.link/20241001-hid-bpf-hid-generic-v3-8-2ef1019468df@kern... Signed-off-by: Benjamin Tissoires bentiss@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hid/hid-core.c | 5 +++-- drivers/hid/hid-generic.c | 3 +++ include/linux/hid.h | 2 ++ 3 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 582fd234eec78..935ccc38d1295 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2674,9 +2674,10 @@ static bool hid_check_device_match(struct hid_device *hdev, /* * hid-generic implements .match(), so we must be dealing with a * different HID driver here, and can simply check if - * hid_ignore_special_drivers is set or not. + * hid_ignore_special_drivers or HID_QUIRK_IGNORE_SPECIAL_DRIVER + * are set or not. */ - return !hid_ignore_special_drivers; + return !hid_ignore_special_drivers && !(hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER); }
static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv) diff --git a/drivers/hid/hid-generic.c b/drivers/hid/hid-generic.c index d2439399fb357..9e04c6d0fcc87 100644 --- a/drivers/hid/hid-generic.c +++ b/drivers/hid/hid-generic.c @@ -40,6 +40,9 @@ static bool hid_generic_match(struct hid_device *hdev, if (ignore_special_driver) return true;
+ if (hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER) + return true; + if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER) return false;
diff --git a/include/linux/hid.h b/include/linux/hid.h index 121d5b8bc8675..a7d60a1c72a09 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -359,6 +359,7 @@ struct hid_item { * | @HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP: * | @HID_QUIRK_HAVE_SPECIAL_DRIVER: * | @HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE: + * | @HID_QUIRK_IGNORE_SPECIAL_DRIVER * | @HID_QUIRK_FULLSPEED_INTERVAL: * | @HID_QUIRK_NO_INIT_REPORTS: * | @HID_QUIRK_NO_IGNORE: @@ -384,6 +385,7 @@ struct hid_item { #define HID_QUIRK_HAVE_SPECIAL_DRIVER BIT(19) #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_FULLSPEED_INTERVAL BIT(28) #define HID_QUIRK_NO_INIT_REPORTS BIT(29) #define HID_QUIRK_NO_IGNORE BIT(30)