linux-kernel - [PATCH v4 0/4] USB Type-C alternate mode priorities

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Message-ID: <20250912064751.1987850-1-akuchynski@chromium.org>
Date: Fri, 12 Sep 2025 06:47:47 +0000
From: Andrei Kuchynski <akuchynski@...omium.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Jameson Thies <jthies@...gle.com>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	linux-usb@...r.kernel.org,
	chrome-platform@...ts.linux.dev
Cc: Guenter Roeck <groeck@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	Andrei Kuchynski <akuchynski@...omium.org>
Subject: [PATCH v4 0/4] USB Type-C alternate mode priorities

This patch series introduces a mechanism for setting USB Type-C alternate
mode priorities. It allows the user to specify their preferred order for
mode selection, such as USB4, Thunderbolt, or DisplayPort.

A new sysfs attribute named 'priority' is exposed to provide user-space
control over the mode selection process.

This series was tested on a Android OS device running kernel 6.16.

Changes in v4:
- replaced sprintf with sysfs_emit
- changed priority to u8
- added an overflow check to typec_mode_set_priority(), now returning
-EOVERFLOW on failure

Andrei Kuchynski (4):
  usb: typec: Add mode_control field to port property
  platform/chrome: cros_ec_typec: Set no_mode_control flag
  usb: typec: Implement alternate mode priority handling
  usb: typec: Expose alternate mode priority via sysfs

 Documentation/ABI/testing/sysfs-class-typec | 11 ++++
 drivers/platform/chrome/cros_ec_typec.c     |  1 +
 drivers/usb/typec/Makefile                  |  2 +-
 drivers/usb/typec/class.c                   | 46 +++++++++++++--
 drivers/usb/typec/class.h                   |  1 +
 drivers/usb/typec/mode_selection.c          | 62 +++++++++++++++++++++
 drivers/usb/typec/mode_selection.h          |  5 ++
 include/linux/usb/typec.h                   |  2 +
 include/linux/usb/typec_altmode.h           |  1 +
 9 files changed, 126 insertions(+), 5 deletions(-)
 create mode 100644 drivers/usb/typec/mode_selection.c
 create mode 100644 drivers/usb/typec/mode_selection.h

-- 
2.51.0.384.g4c02a37b29-goog