netdev - [PATCH v4 04/11] tty: serdev: Add method to enable break flags

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Date: Thu,  9 May 2024 19:17:29 +0200
From: Christoph Fritz <christoph.fritz@...dev.de>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Jiri Slaby <jirislaby@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <bentiss@...nel.org>,
	Sebastian Reichel <sre@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>
Cc: Andreas Lauser <andreas.lauser@...cedes-benz.com>,
	Jonathan Corbet <corbet@....net>,
	Pavel Pisa <pisa@....felk.cvut.cz>,
	linux-can@...r.kernel.org,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-input@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: [PATCH v4 04/11] tty: serdev: Add method to enable break flags

The recently introduced callback function receive_buf_fp() brings flags
buffer support. To allow signaling of TTY_BREAK flags, this patch
introduces serdev_device_set_break_detection() and an implementation for
ttyport. This enables serdev devices to configure their underlying tty
port to signal or ignore break conditions.

Signed-off-by: Christoph Fritz <christoph.fritz@...dev.de>
---
 drivers/tty/serdev/core.c           | 11 +++++++++++
 drivers/tty/serdev/serdev-ttyport.c | 17 +++++++++++++++++
 include/linux/serdev.h              |  2 ++
 3 files changed, 30 insertions(+)

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 613cb356b918d..23a1e76cb553b 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -339,6 +339,17 @@ unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned i
 }
 EXPORT_SYMBOL_GPL(serdev_device_set_baudrate);
 
+void serdev_device_set_break_detection(struct serdev_device *serdev, bool enable)
+{
+	struct serdev_controller *ctrl = serdev->ctrl;
+
+	if (!ctrl || !ctrl->ops->set_break_detection)
+		return;
+
+	ctrl->ops->set_break_detection(ctrl, enable);
+}
+EXPORT_SYMBOL_GPL(serdev_device_set_break_detection);
+
 void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
 {
 	struct serdev_controller *ctrl = serdev->ctrl;
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index bb47691afdb21..e928bf4175c6f 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -192,6 +192,22 @@ static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable
 	tty_set_termios(tty, &ktermios);
 }
 
+static void ttyport_set_break_detection(struct serdev_controller *ctrl, bool enable)
+{
+	struct serport *serport = serdev_controller_get_drvdata(ctrl);
+	struct tty_struct *tty = serport->tty;
+	struct ktermios ktermios = tty->termios;
+
+	ktermios.c_iflag &= ~(IGNBRK | BRKINT);
+
+	if (enable)
+		ktermios.c_iflag |= BRKINT;
+	else
+		ktermios.c_iflag |= IGNBRK;
+
+	tty_set_termios(tty, &ktermios);
+}
+
 static int ttyport_set_parity(struct serdev_controller *ctrl,
 			      enum serdev_parity parity)
 {
@@ -263,6 +279,7 @@ static const struct serdev_controller_ops ctrl_ops = {
 	.open = ttyport_open,
 	.close = ttyport_close,
 	.set_flow_control = ttyport_set_flow_control,
+	.set_break_detection = ttyport_set_break_detection,
 	.set_parity = ttyport_set_parity,
 	.set_baudrate = ttyport_set_baudrate,
 	.wait_until_sent = ttyport_wait_until_sent,
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 94fc81a1de933..84805762a67cc 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -91,6 +91,7 @@ struct serdev_controller_ops {
 	int (*open)(struct serdev_controller *);
 	void (*close)(struct serdev_controller *);
 	void (*set_flow_control)(struct serdev_controller *, bool);
+	void (*set_break_detection)(struct serdev_controller *, bool);
 	int (*set_parity)(struct serdev_controller *, enum serdev_parity);
 	unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int);
 	void (*wait_until_sent)(struct serdev_controller *, long);
@@ -208,6 +209,7 @@ void serdev_device_close(struct serdev_device *);
 int devm_serdev_device_open(struct device *, struct serdev_device *);
 unsigned int serdev_device_set_baudrate(struct serdev_device *, unsigned int);
 void serdev_device_set_flow_control(struct serdev_device *, bool);
+void serdev_device_set_break_detection(struct serdev_device *, bool);
 int serdev_device_write_buf(struct serdev_device *, const u8 *, size_t);
 void serdev_device_wait_until_sent(struct serdev_device *, long);
 int serdev_device_get_tiocm(struct serdev_device *);
-- 
2.39.2