This is a note to let you know that I've just added the patch titled HID: wacom: Ensure bootloader PID is usable in hidraw mode to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: hid-wacom-ensure-bootloader-pid-is-usable-in-hidraw-mode.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1db1f392591aff13fd643f0ec7c1d5e27391d700 Mon Sep 17 00:00:00 2001 From: Jason Gerecke <killertofu@xxxxxxxxx> Date: Thu, 1 Dec 2022 15:11:41 -0800 Subject: HID: wacom: Ensure bootloader PID is usable in hidraw mode From: Jason Gerecke <killertofu@xxxxxxxxx> commit 1db1f392591aff13fd643f0ec7c1d5e27391d700 upstream. Some Wacom devices have a special "bootloader" mode that is used for firmware flashing. When operating in this mode, the device cannot be used for input, and the HID descriptor is not able to be processed by the driver. The driver generates an "Unknown device_type" warning and then returns an error code from wacom_probe(). This is a problem because userspace still needs to be able to interact with the device via hidraw to perform the firmware flash. This commit adds a non-generic device definition for 056a:0094 which is used when devices are in "bootloader" mode. It marks the devices with a special BOOTLOADER type that is recognized by wacom_probe() and wacom_raw_event(). When we see this type we ensure a hidraw device is created and otherwise keep our hands off so that userspace is in full control. Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx> Tested-by: Tatsunosuke Tobita <tatsunosuke.tobita@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/hid/wacom_sys.c | 8 ++++++++ drivers/hid/wacom_wac.c | 4 ++++ drivers/hid/wacom_wac.h | 1 + 3 files changed, 13 insertions(+) --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -69,6 +69,9 @@ static int wacom_raw_event(struct hid_de { struct wacom *wacom = hid_get_drvdata(hdev); + if (wacom->wacom_wac.features.type == BOOTLOADER) + return 0; + if (size > WACOM_PKGLEN_MAX) return 1; @@ -2409,6 +2412,11 @@ static int wacom_probe(struct hid_device goto fail; } + if (features->type == BOOTLOADER) { + hid_warn(hdev, "Using device in hidraw-only mode"); + return hid_hw_start(hdev, HID_CONNECT_HIDRAW); + } + error = wacom_parse_and_register(wacom, false); if (error) goto fail; --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -3550,6 +3550,9 @@ static const struct wacom_features wacom static const struct wacom_features wacom_features_HID_ANY_ID = { "Wacom HID", .type = HID_GENERIC, .oVid = HID_ANY_ID, .oPid = HID_ANY_ID }; +static const struct wacom_features wacom_features_0x94 = + { "Wacom Bootloader", .type = BOOTLOADER }; + #define USB_DEVICE_WACOM(prod) \ HID_DEVICE(BUS_USB, HID_GROUP_WACOM, USB_VENDOR_ID_WACOM, prod),\ .driver_data = (kernel_ulong_t)&wacom_features_##prod @@ -3623,6 +3626,7 @@ const struct hid_device_id wacom_ids[] = { USB_DEVICE_WACOM(0x84) }, { USB_DEVICE_WACOM(0x90) }, { USB_DEVICE_WACOM(0x93) }, + { USB_DEVICE_WACOM(0x94) }, { USB_DEVICE_WACOM(0x97) }, { USB_DEVICE_WACOM(0x9A) }, { USB_DEVICE_WACOM(0x9F) }, --- a/drivers/hid/wacom_wac.h +++ b/drivers/hid/wacom_wac.h @@ -154,6 +154,7 @@ enum { MTTPC, MTTPC_B, HID_GENERIC, + BOOTLOADER, MAX_TYPE }; Patches currently in stable-queue which might be from killertofu@xxxxxxxxx are queue-4.9/hid-wacom-ensure-bootloader-pid-is-usable-in-hidraw-mode.patch