diff mbox series

[SRU,B,08/10] serdev: add method to set parity

Message ID 20200221064127.16848-9-shrirang.bagul@canonical.com
State New
Headers show
Series Support Intel Atom (Baytrail-I) HS-UART serdev slaves over tty | expand

Commit Message

Shrirang Bagul Feb. 21, 2020, 6:41 a.m. UTC 
From: Ulrich Hecht <ulrich.hecht+renesas at gmail.com>

BugLink: https://bugs.launchpad.net/bugs/1864147

Adds serdev_device_set_parity() and an implementation for ttyport.
The interface uses an enum with the values SERIAL_PARITY_NONE,
SERIAL_PARITY_EVEN and SERIAL_PARITY_ODD.

linux-oem buglink: http://bugs.launchpad.net/bugs/1769610

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas at gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel at collabora.co.uk>
Reviewed-by: Johan Hovold <johan at kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Marcel Holtmann <marcel at holtmann.org>
(cherry picked from commit 3a19cfcce105e481b02b14265c5b40c6c10ef60a)
Signed-off-by: Shrirang Bagul <shrirang.bagul at canonical.com>
Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
(cherry picked from commit bde43da95469867b360c5b608a9944acfaf451cb)
(source tag: Ubuntu-oem-4.15.0-1073.83)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
---
 drivers/tty/serdev/core.c           | 12 ++++++++++++
 drivers/tty/serdev/serdev-ttyport.c | 24 ++++++++++++++++++++++++
 include/linux/serdev.h              | 10 ++++++++++
 3 files changed, 46 insertions(+)
diff mbox series

Patch

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 845f766c7169..137cafdaad4c 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -282,6 +282,18 @@  void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
 }
 EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
 
+int serdev_device_set_parity(struct serdev_device *serdev,
+			     enum serdev_parity parity)
+{
+	struct serdev_controller *ctrl = serdev->ctrl;
+
+	if (!ctrl || !ctrl->ops->set_parity)
+		return -ENOTSUPP;
+
+	return ctrl->ops->set_parity(ctrl, parity);
+}
+EXPORT_SYMBOL_GPL(serdev_device_set_parity);
+
 void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
 {
 	struct serdev_controller *ctrl = serdev->ctrl;
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index a5abb05be67d..fa1672993b4c 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -194,6 +194,29 @@  static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable
 	tty_set_termios(tty, &ktermios);
 }
 
+static int ttyport_set_parity(struct serdev_controller *ctrl,
+			      enum serdev_parity parity)
+{
+	struct serport *serport = serdev_controller_get_drvdata(ctrl);
+	struct tty_struct *tty = serport->tty;
+	struct ktermios ktermios = tty->termios;
+
+	ktermios.c_cflag &= ~(PARENB | PARODD | CMSPAR);
+	if (parity != SERDEV_PARITY_NONE) {
+		ktermios.c_cflag |= PARENB;
+		if (parity == SERDEV_PARITY_ODD)
+			ktermios.c_cflag |= PARODD;
+	}
+
+	tty_set_termios(tty, &ktermios);
+
+	if ((tty->termios.c_cflag & (PARENB | PARODD | CMSPAR)) !=
+	    (ktermios.c_cflag & (PARENB | PARODD | CMSPAR)))
+		return -EINVAL;
+
+	return 0;
+}
+
 static void ttyport_wait_until_sent(struct serdev_controller *ctrl, long timeout)
 {
 	struct serport *serport = serdev_controller_get_drvdata(ctrl);
@@ -231,6 +254,7 @@  static const struct serdev_controller_ops ctrl_ops = {
 	.open = ttyport_open,
 	.close = ttyport_close,
 	.set_flow_control = ttyport_set_flow_control,
+	.set_parity = ttyport_set_parity,
 	.set_baudrate = ttyport_set_baudrate,
 	.wait_until_sent = ttyport_wait_until_sent,
 	.get_tiocm = ttyport_get_tiocm,
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index d4bb46a26dc3..531031a15cdd 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -76,6 +76,12 @@  static inline struct serdev_device_driver *to_serdev_device_driver(struct device
 	return container_of(d, struct serdev_device_driver, driver);
 }
 
+enum serdev_parity {
+	SERDEV_PARITY_NONE,
+	SERDEV_PARITY_EVEN,
+	SERDEV_PARITY_ODD,
+};
+
 /*
  * serdev controller structures
  */
@@ -86,6 +92,7 @@  struct serdev_controller_ops {
 	int (*open)(struct serdev_controller *);
 	void (*close)(struct serdev_controller *);
 	void (*set_flow_control)(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);
 	int (*get_tiocm)(struct serdev_controller *);
@@ -299,6 +306,9 @@  static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enabl
 		return serdev_device_set_tiocm(serdev, 0, TIOCM_RTS);
 }
 
+int serdev_device_set_parity(struct serdev_device *serdev,
+			     enum serdev_parity parity);
+
 /*
  * serdev hooks into TTY core
  */