linux-kernel - [PATCH v3 10/10] platform/chrome: cros_ec_typec: Add default_usb_mode

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Message-ID: <20250804090340.3062182-11-akuchynski@chromium.org>
Date: Mon,  4 Aug 2025 09:03:39 +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>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	"Christian A. Ehrhardt" <lk@...e.de>,
	Venkat Jayaraman <venkat.jayaraman@...el.com>,
	linux-kernel@...r.kernel.org,
	Andrei Kuchynski <akuchynski@...omium.org>
Subject: [PATCH v3 10/10] platform/chrome: cros_ec_typec: Add default_usb_mode_set support

The `cros_ec_typec` driver currently doesn't directly consume a default
USB mode value. This commit adds the `default_usb_mode_set` function,
enabling the `usb_capability` sysfs attribute to be writable.
This functionality allows users to dynamically activate or deactivate
USB4 mode on a given port.

Signed-off-by: Andrei Kuchynski <akuchynski@...omium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 5a3d393c26ee..9bfe78e315fc 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -44,6 +44,11 @@ static void cros_typec_role_switch_quirk(struct fwnode_handle *fwnode)
 #endif
 }
 
+static int cros_typec_default_usb_mode_set(struct typec_port *port, enum usb_mode mode)
+{
+	return 0;
+}
+
 static int cros_typec_enter_usb_mode(struct typec_port *tc_port, enum usb_mode mode)
 {
 	struct cros_typec_port *port = typec_get_drvdata(tc_port);
@@ -140,6 +145,7 @@ static int cros_typec_pr_swap(struct typec_port *port, enum typec_role role)
 }
 
 static const struct typec_operations cros_typec_usb_mode_ops = {
+	.default_usb_mode_set = cros_typec_default_usb_mode_set,
 	.enter_usb_mode = cros_typec_enter_usb_mode,
 	.dr_set = cros_typec_dr_swap,
 	.pr_set = cros_typec_pr_swap,
-- 
2.50.1.565.gc32cd1483b-goog