Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 756db778 authored by Sebastian Reichel's avatar Sebastian Reichel Committed by Marcel Holtmann
Browse files

serdev: add helpers for cts and rts handling 



Add serdev helper functions for handling of cts and rts
lines using the serdev's tiocm functions.

Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 5659dab2

include/linux/serdev.h

+31 −0
Original line number Original line Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/types.h>

#include <linux/types.h>

#include <linux/device.h>

#include <linux/device.h>

#include <linux/termios.h>

#include <linux/termios.h>

#include <linux/delay.h>





struct serdev_controller;

struct serdev_controller;

struct serdev_device;

struct serdev_device;
@@ -254,6 +255,36 @@ static inline int serdev_device_write_room(struct serdev_device *sdev) 




#endif /* CONFIG_SERIAL_DEV_BUS */

#endif /* CONFIG_SERIAL_DEV_BUS */





static inline bool serdev_device_get_cts(struct serdev_device *serdev)

{

	int status = serdev_device_get_tiocm(serdev);

	return !!(status & TIOCM_CTS);

}



static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms)

{

	unsigned long timeout;

	bool signal;



	timeout = jiffies + msecs_to_jiffies(timeout_ms);

	while (time_is_after_jiffies(timeout)) {

		signal = serdev_device_get_cts(serdev);

		if (signal == state)

			return 0;

		usleep_range(1000, 2000);

	}



	return -ETIMEDOUT;

}



static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enable)

{

	if (enable)

		return serdev_device_set_tiocm(serdev, TIOCM_RTS, 0);

	else

		return serdev_device_set_tiocm(serdev, 0, TIOCM_RTS);

}



/*

/*

 * serdev hooks into TTY core

 * serdev hooks into TTY core

 */

 */