Hello The CH348 is an octo serial to USB adapter. The following patch adds a driver for supporting it. Since there is no public datasheet, unfortunatly it remains some magic values. It was tested with a large range of baud from 1200 to 1500000 and used with success in one of our kernel CI testlab. Regards Changes since v1: - use a data structure for encoding/decoding messages. - check if needed endpoints exists - fix URB leak in ch348_allocate_status_read error case - test for maximum baud rate as stated by datasheet Changes since v2: - specify ch348_rxbuf data length - Use correct speed_t dwDTERate instead of __le32 - test for maximum baud rate supported according to datasheet - Use a define for CH348_TX_HDRSIZE Changes since v3 - Fixed all reported problem from https://lore.kernel.org/lkml/Y5NDwEakGJbmB6+b@Red/T/#mb6234d0427cfdabf412190565e215995a41482dd Mostly reworked the endpoint mux to be the same than mx_uport Changes since v4: - The V4 was sent against stable and next have ch348_set_termios ktermios parameter const that I forgot to change Changes since v5: - Fixed all reported problem from https://lore.kernel.org/lkml/20230106135338.643951-1-clabbe@xxxxxxxxxxxx/T/#m044aab24dfb652ea34aa06f8ef704da9d6a2e036 - Major change is dropping of all status handling which was unused. It will be probably necessary to bring it back when using GPIO. This will be done when I will finish my next devboard. Changes since v6: - read and print the device version during probe - Only request one bulk out channel from usb-serial core - Implement status report / interrupt handling - Fix buffer->rate calculation / enable support for slow baud rates - use a mutex to protect against concurrent writes - split write buffers for slow baud rates Important note, v7 is mostly done from work of Martin Blumenstingl, so the changelog was built from https://github.com/xdarklight/ch348/commits/main/ Great thanks to him Corentin Labbe (1): usb: serial: add support for CH348 drivers/usb/serial/Kconfig | 9 + drivers/usb/serial/Makefile | 1 + drivers/usb/serial/ch348.c | 725 ++++++++++++++++++++++++++++++++++++ 3 files changed, 735 insertions(+) create mode 100644 drivers/usb/serial/ch348.c -- 2.43.2
