kernel/git/stable/linux-stable.git/drivers/usb/serial/pl2303.c, branch master

USB: serial: pl2303: add support for PL256X multi-port devices

2026-08-03T08:48:44+00:00

Prolific PL256X devices are multi-port USB-to-UART controllers, including the PL2533, PL2543 and PL2565 variants. These devices use vendor requests that differ from those used by the existing TYPE_HX and TYPE_HXN devices. They also require a separate UART reset request and use a port-specific register for configuring flow control. Add a new TYPE_MP device type and select the appropriate vendor requests, reset operation and flow-control register for PL256X devices. Store the USB interface number so that requests can be directed to the corresponding UART port. Detect the supported PL256X variants using bcdDevice before issuing any legacy vendor requests, as PL256X devices do not accept those requests. PL256X devices support baud rates up to 24 Mbps and do not use divisor encoding. Signed-off-by: Charles Yeh Link: https://lore.kernel.org/all/CAAZvQQ6O4p35Xs2hVYaoJxD4D7U0YonsdweuPh6W8RQVhvoUNw@mail.gmail.com/ Signed-off-by: Johan Hovold

USB: serial: drop unused moduleparam includes

2026-05-11T07:34:13+00:00

These drivers (and usb-serial.c) no longer use anything from moduleparam.h so drop the unnecessary include directives. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: drop unused uaccess includes

2026-05-11T07:34:08+00:00

These drivers (and usb-serial.c) no longer use anything from uaccess.h directly so drop the unnecessary include directives. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: drop unused tty_driver includes

2026-05-11T07:33:40+00:00

USB serial drivers do not use anything from tty_driver.h directly (only core does) so drop the unnecessary include directives. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

USB: serial: pl2303: add new chip PL2303GC-Q20 and PL2303GT-2AB

2025-05-21T15:19:55+00:00

Add new bcd (0x905) to support PL2303GT-2AB (TYPE_HXN). Add new bcd (0x1005) to support PL2303GC-Q20 (TYPE_HXN). Signed-off-by: Charles Yeh Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold

USB: serial: pl2303: account for deficits of clones

2024-11-06T16:23:33+00:00

There are apparently incomplete clones of the HXD type chip in use. Those return -EPIPE on GET_LINE_REQUEST and BREAK_REQUEST. Avoid flooding the kernel log with those errors. Detect them during startup and then use the line_settings cache instead of GET_LINE_REQUEST. Signal missing break support via -ENOTTY. Signed-off-by: Jan Kiszka [ johan: fix macro prefix, drop oom error message ] Signed-off-by: Johan Hovold

move asm/unaligned.h to linux/unaligned.h

2024-10-02T21:23:23+00:00

asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h

Merge tag 'usb-serial-6.12-rc1-2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next

2024-09-11T13:19:45+00:00

Johan writes: USB-serial device id for 6.12-rc1 Here's a new pl2303 device id. This one has been in linux-next with no reported issues. * tag 'usb-serial-6.12-rc1-2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial: USB: serial: pl2303: add device id for Macrosilicon MS3020