linux-drivers/
drivers/usb/misc

Assorted USB miscellaneous device drivers

A catch-all collection of small USB peripheral and infrastructure drivers, ranging from onboard and standalone USB hub controllers (Microchip USB251xB, TI TUSB8044, WCH CH334, Parade PS5511) to debug and accessory hardware like Qualcomm's Embedded USB Debugger and Intel's LJCA USB-to-I2C/SPI/GPIO bridge, plus various legacy USB gadgets and test devices accumulated over two decades.

keep-annotate conf=0.86 last_sold=2026 deploy=medium replacement=none subsystem=usb category=bus-usb
86%

recommendation

Worth keeping but flagging for per-driver review because this directory is a grab bag rather than a single chipset family. It mixes still-current embedded support, like Microchip USB2514B and TI TUSB8044 onboard hubs, Qualcomm's EUD debug controller, and Intel's LJCA USB bridge, alongside older one-off gadgets. Upstream activity remains healthy through 2025 and 2026, with recent additions for WCH CH334, TI TUSB8044, Parade PS5511, and Realtek RTL8188ETV hubs, so wholesale deprecation is inappropriate; individual legacy drivers inside may still merit case-by-case scrutiny.

repository signals

40 files
21,443 source lines
166 commits, 5y
+5,512 / −8,075 lines added / removed, 5y
89 authors, 5y
monthly commits · 2021-04-21 → 2026-04-21 · 166 total · active in 54/61 months
2021 2022 2023 2024 2025 2026 2021-04: 1 commit · +3 −3 2021-05: 2 commits · +3 −2 2021-06: 4 commits · +517 −516 2021-07: 0 commits · +0 −0 2021-08: 2 commits · +3 −4 2021-09: 1 commit · +65 −16 2021-10: 2 commits · +18 −71 2021-11: 0 commits · +0 −0 2021-12: 2 commits · +59 −0 2022-01: 1 commit · +3 −1 2022-02: 3 commits · +797 −0 2022-03: 1 commit · +6 −11 2022-04: 2 commits · +6 −7 2022-05: 1 commit · +0 −534 2022-06: 2 commits · +605 −1 2022-07: 8 commits · +64 −12 2022-08: 3 commits · +5 −10 2022-09: 4 commits · +31 −22 2022-10: 3 commits · +3 −5 2022-11: 6 commits · +7 −13 2022-12: 4 commits · +14 −2,971 2023-01: 5 commits · +25 −10 2023-02: 1 commit · +2 −0 2023-03: 7 commits · +85 −2,856 2023-04: 1 commit · +14 −0 2023-05: 5 commits · +12 −16 2023-06: 4 commits · +52 −13 2023-07: 2 commits · +5 −5 2023-08: 3 commits · +8 −105 2023-09: 1 commit · +2 −0 2023-10: 4 commits · +919 −7 2023-11: 8 commits · +42 −18 2023-12: 2 commits · +10 −6 2024-01: 1 commit · +1 −1 2024-02: 1 commit · +9 −0 2024-03: 10 commits · +688 −606 2024-04: 1 commit · +5 −1 2024-05: 0 commits · +0 −0 2024-06: 3 commits · +21 −15 2024-07: 2 commits · +2 −4 2024-08: 2 commits · +2 −0 2024-09: 10 commits · +160 −29 2024-10: 5 commits · +36 −26 2024-11: 3 commits · +16 −7 2024-12: 2 commits · +7 −5 2025-01: 0 commits · +0 −0 2025-02: 2 commits · +10 −5 2025-03: 0 commits · +0 −0 2025-04: 4 commits · +30 −3 2025-05: 5 commits · +98 −17 2025-06: 2 commits · +31 −3 2025-07: 1 commit · +25 −9 2025-08: 4 commits · +102 −21 2025-09: 2 commits · +765 −1 2025-10: 4 commits · +42 −20 2025-11: 1 commit · +0 −1 2025-12: 0 commits · +0 −0 2026-01: 1 commit · +8 −0 2026-02: 4 commits · +64 −64 2026-03: 1 commit · +5 −2 2026-04: 0 commits · +0 −0

sources

  1. git.kernel.org

    Upstream activity is current and non-trivial; the directory kept receiving fixes and new-device enablement through 2024-2026, including 2026 fixes and 2025 support additions.

  2. git.kernel.org

    This is a heterogeneous bucket of unrelated USB misc drivers rather than one obsolete chipset family, so there is no single replacement path for the whole directory.

  3. ti.com

    TI still published the TUSB8044 product page in 2026, marking TUSB8044 NRND while pointing to active successor TUSB8044A; that supports ongoing embedded/onboard USB hub deployments relevant to this directory.

  4. microchip.com

    Microchip still serves a product page for the USB2514B hub family, supporting continued real-world relevance of the usb251xb/onboard hub support in this directory.

codex reasoning notes (technical)

Local shell inspection (`rg --files`) showed this directory contains many distinct USB misc drivers, including current embedded/platform pieces such as `usb251xb`, `onboard_usb_dev`, `usb-ljca`, and `qcom_eud`, so a whole-directory deprecation would be over-broad. Local `git -c safe.directory=... log --since=2021-01-01 -- drivers/usb/misc` showed active maintenance and new enablement through 2026-04-02, including 2025 additions for WCH CH334, TI TUSB8044, Parade PS5511, Realtek RTL8188ETV, and multiple 2026 bug fixes; I mapped that evidence to the canonical kernel.org path-log URL by canonical recall. The kernel Kconfig/tree URL is likewise a canonical kernel.org path recalled stably. The TI and Microchip URLs were obtained via web `open`. I did not find evidence of an active whole-directory removal effort in the inspected recent history; given the mix of legacy one-off drivers and still-current embedded hub/bridge support, the defensible outcome is keep the directory but annotate/per-driver review rather than deprecate or remove the entire subtree.