linux-kernel - [PATCHv2 07/11] serdev: add helpers for cts and rts handling

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Message-Id: <20170321223216.11733-8-sre@kernel.org>
Date:   Tue, 21 Mar 2017 23:32:12 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Sebastian Reichel <sre@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Samuel Thibault <samuel.thibault@...-lyon.org>,
        Pavel Machek <pavel@....cz>, Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCHv2 07/11] 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.

Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 include/linux/serdev.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 3ad1d695f947..8cdce2ea0d51 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -16,6 +16,7 @@
 #include <linux/types.h>
 #include <linux/device.h>
 #include <asm-generic/termios.h>
+#include <linux/delay.h>
 
 struct serdev_controller;
 struct serdev_device;
@@ -254,6 +255,36 @@ static inline int serdev_device_write_room(struct serdev_device *sdev)
 
 #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_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_OUT2 | TIOCM_RTS, 0);
+	else
+		return serdev_device_set_tiocm(serdev, 0, TIOCM_OUT2 | TIOCM_RTS);
+}
+
 /*
  * serdev hooks into TTY core
  */
-- 
2.11.0