Add method to get current CTS line state.
Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
---
drivers/tty/serdev/core.c | 11 +++++++++++
drivers/tty/serdev/serdev-ttyport.c | 15 +++++++++++++++
include/linux/serdev.h | 6 ++++++
3 files changed, 32 insertions(+)
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index a63b74031e22..36eb3dfb1477 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -184,6 +184,17 @@ void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
}
EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent);
+bool serdev_device_get_cts(struct serdev_device *serdev)
+{
+ struct serdev_controller *ctrl = serdev->ctrl;
+
+ if (!ctrl || !ctrl->ops->get_cts)
+ return false;
+
+ return ctrl->ops->get_cts(ctrl);
+}
+EXPORT_SYMBOL_GPL(serdev_device_get_cts);
+
static int serdev_drv_probe(struct device *dev)
{
const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index db2bc601e554..3eaca7560e2e 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -179,6 +179,20 @@ static void ttyport_wait_until_sent(struct serdev_controller *ctrl, long timeout
tty_wait_until_sent(tty, timeout);
}
+static bool ttyport_get_cts(struct serdev_controller *ctrl)
+{
+ struct serport *serport = serdev_controller_get_drvdata(ctrl);
+ struct tty_struct *tty = serport->tty;
+ int status;
+
+ if (!tty->ops->tiocmget)
+ return false;
+
+ status = tty->ops->tiocmget(tty);
+
+ return !!(status & TIOCM_CTS);
+}
+
static const struct serdev_controller_ops ctrl_ops = {
.write_buf = ttyport_write_buf,
.write_flush = ttyport_write_flush,
@@ -188,6 +202,7 @@ static const struct serdev_controller_ops ctrl_ops = {
.set_flow_control = ttyport_set_flow_control,
.set_baudrate = ttyport_set_baudrate,
.wait_until_sent = ttyport_wait_until_sent,
+ .get_cts = ttyport_get_cts,
};
struct device *serdev_tty_port_register(struct tty_port *port,
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index a308b206d204..b0c47402d84a 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -82,6 +82,7 @@ struct serdev_controller_ops {
void (*set_flow_control)(struct serdev_controller *, bool);
unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int);
void (*wait_until_sent)(struct serdev_controller *, long);
+ bool (*get_cts)(struct serdev_controller *);
};
/**
@@ -188,6 +189,7 @@ void serdev_device_close(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_wait_until_sent(struct serdev_device *, long);
+bool serdev_device_get_cts(struct serdev_device *);
int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_t);
void serdev_device_write_flush(struct serdev_device *);
int serdev_device_write_room(struct serdev_device *);
@@ -226,6 +228,10 @@ static inline unsigned int serdev_device_set_baudrate(struct serdev_device *sdev
}
static inline void serdev_device_set_flow_control(struct serdev_device *sdev, bool enable) {}
static inline void serdev_device_wait_until_sent(struct serdev_device *sdev, long timeout) {}
+static inline bool serdev_device_get_cts(struct serdev_device *serdev)
+{
+ return false;
+}
static inline int serdev_device_write_buf(struct serdev_device *sdev, const unsigned char *buf, size_t count)
{
return -ENODEV;
--
2.11.0
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