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[2001:b011:1:3a55:372a:4d8b:a513:4837]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82a0724407csm6265488b3a.8.2026.03.13.10.57.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Mar 2026 10:57:35 -0700 (PDT) From: Daniel Schaefer To: linux-input@vger.kernel.org Cc: Daniel Schaefer , Richard Hughes , Mario Limonciello , Jiri Kosina , Benjamin Tissoires , linux@frame.work Subject: [PATCH 4/4] HID: core: Export device version via HID_FIRMWARE_VERSION uevent Date: Sat, 14 Mar 2026 01:56:59 +0800 Message-ID: <20260313175659.268094-5-dhs@frame.work> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260313175659.268094-1-dhs@frame.work> References: <20260313175659.268094-1-dhs@frame.work> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Expose the HID device version to userspace via the new HID_FIRMWARE_VERSION uevent property. This enables userspace tools (such as fwupd and hidapi) to retrieve device firmware version information, providing parity with Windows HidD_GetAttributes() API which returns VID, PID, and VersionNumber. The version is exported as a 4-digit uppercase hexadecimal value (e.g., "0100" for version 1.0), consistent with how USB devices report bcdDevice. fwupd can handle this since: https://github.com/fwupd/fwupd/commit/fb0d4cc98abe253003ea0e1837277fd42971e0de But the kernel hasn't yet exposed this. hidapi patch is in-flight: https://github.com/libusb/hidapi/pull/777 Cc: Richard Hughes Cc: Mario Limonciello Cc: Jiri Kosina Cc: Benjamin Tissoires Cc: linux@frame.work Signed-off-by: Daniel Schaefer --- drivers/hid/hid-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index da57cbf0af26..c2075d5b40c3 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2884,6 +2884,9 @@ static int hid_uevent(const struct device *dev, struct kobj_uevent_env *env) if (add_uevent_var(env, "HID_UNIQ=%s", hdev->uniq)) return -ENOMEM; + if (add_uevent_var(env, "HID_FIRMWARE_VERSION=%04X", hdev->version)) + return -ENOMEM; + if (add_uevent_var(env, "MODALIAS=hid:b%04Xg%04Xv%08Xp%08X", hdev->bus, hdev->group, hdev->vendor, hdev->product)) return -ENOMEM; -- 2.52.0