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usb: Add environment based device ignorelist

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Add the environment variable "usb_ignorelist" to prevent USB devices
listed in it from being bound to drivers. This allows to ignore devices
which are undesirable or trigger bugs in u-boot's USB stack.
Devices emulating keyboards are one example of undesirable devices as
u-boot currently supports only a single USB keyboard device. Most
commonly, people run into this with Yubikeys, so let's ignore those in
the default environment.

Based on previous USB keyboard specific patches for the same purpose.

Link: https://lore.kernel.org/u-boot/7ab604fb-0fec-4f5e-8708-7a3a7e2cb568@denx.de/
Reviewed-by: Neal Gompa <neal@gompa.dev>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2024-04-04 08:25:52 +02:00 • committed by Marek Vasut
parent 0b6775c402
commit 18f288b8d4
3 changed files with 94 additions and 0 deletions
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11
include/env_default.h
View file

@ -99,6 +99,17 @@ const char default_environment[] = {
#ifdef CONFIG_SYS_SOC
"soc=" CONFIG_SYS_SOC "\0"
#endif
#ifdef CONFIG_USB_HOST
"usb_ignorelist="
#ifdef CONFIG_USB_KEYBOARD
/* Ignore Yubico devices. Currently only a single USB keyboard device is
* supported and the emulated HID keyboard Yubikeys present is useless
* as keyboard.
*/
"0x1050:*,"
#endif
"\0"
#endif
#ifdef CONFIG_ENV_IMPORT_FDT
"env_fdt_path=" CONFIG_ENV_FDT_PATH "\0"
#endif