Commit 8eaf839e authored by Neeraj Sanjay Kale's avatar Neeraj Sanjay Kale Committed by Luiz Augusto von Dentz
Browse files

serdev: Add method to assert break signal over tty UART port 



Adds serdev_device_break_ctl() and an implementation for ttyport.
This function simply calls the break_ctl in tty layer, which can
assert a break signal over UART-TX line, if the tty and the
underlying platform and UART peripheral supports this operation.

Signed-off-by: default avatarNeeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
Reviewed-by: default avatarSimon Horman <simon.horman@corigine.com>
Signed-off-by: default avatarLuiz Augusto von Dentz <luiz.von.dentz@intel.com>
parent 29f93a68

drivers/tty/serdev/core.c

+11 −0
Original line number Diff line number Diff line
@@ -405,6 +405,17 @@ int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear) 
}

EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);



int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)

{

	struct serdev_controller *ctrl = serdev->ctrl;



	if (!ctrl || !ctrl->ops->break_ctl)

		return -EOPNOTSUPP;



	return ctrl->ops->break_ctl(ctrl, break_state);

}

EXPORT_SYMBOL_GPL(serdev_device_break_ctl);



static int serdev_drv_probe(struct device *dev)

{

	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);

drivers/tty/serdev/serdev-ttyport.c

+12 −0
Original line number Diff line number Diff line
@@ -247,6 +247,17 @@ static int ttyport_set_tiocm(struct serdev_controller *ctrl, unsigned int set, u 
	return tty->ops->tiocmset(tty, set, clear);

}



static int ttyport_break_ctl(struct serdev_controller *ctrl, unsigned int break_state)

{

	struct serport *serport = serdev_controller_get_drvdata(ctrl);

	struct tty_struct *tty = serport->tty;



	if (!tty->ops->break_ctl)

		return -EOPNOTSUPP;



	return tty->ops->break_ctl(tty, break_state);

}



static const struct serdev_controller_ops ctrl_ops = {

	.write_buf = ttyport_write_buf,

	.write_flush = ttyport_write_flush,
@@ -259,6 +270,7 @@ static const struct serdev_controller_ops ctrl_ops = { 
	.wait_until_sent = ttyport_wait_until_sent,

	.get_tiocm = ttyport_get_tiocm,

	.set_tiocm = ttyport_set_tiocm,

	.break_ctl = ttyport_break_ctl,

};



struct device *serdev_tty_port_register(struct tty_port *port,

include/linux/serdev.h

+6 −0
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ struct serdev_controller_ops { 
	void (*wait_until_sent)(struct serdev_controller *, long);

	int (*get_tiocm)(struct serdev_controller *);

	int (*set_tiocm)(struct serdev_controller *, unsigned int, unsigned int);

	int (*break_ctl)(struct serdev_controller *ctrl, unsigned int break_state);

};



/**
@@ -203,6 +204,7 @@ int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_ 
void serdev_device_wait_until_sent(struct serdev_device *, long);

int serdev_device_get_tiocm(struct serdev_device *);

int serdev_device_set_tiocm(struct serdev_device *, int, int);

int serdev_device_break_ctl(struct serdev_device *serdev, int break_state);

void serdev_device_write_wakeup(struct serdev_device *);

int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, long);

void serdev_device_write_flush(struct serdev_device *);
@@ -256,6 +258,10 @@ static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set, 
{

	return -EOPNOTSUPP;

}

static inline int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)

{

	return -EOPNOTSUPP;

}

static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf,

				      size_t count, unsigned long timeout)

{