[v10,1/3] serdev: Add method to assert break signal over tty UART port

Commit Message

Neeraj Sanjay Kale March 13, 2023, 2:40 p.m. UTC

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: Neeraj Sanjay Kale <[e-mail]>
---
v3: Add details to the commit message. Replace ENOTSUPP with
EOPNOTSUPP. (Greg KH, Leon Romanovsky)
v9: Replace all instances of ENOTSUPP with EOPNOTSUPP.
(Simon Horman)
---
 drivers/tty/serdev/core.c           | 17 ++++++++++++++---
 drivers/tty/serdev/serdev-ttyport.c | 16 ++++++++++++++--
 include/linux/serdev.h              |  6 ++++++
 3 files changed, 34 insertions(+), 5 deletions(-)

Comments

[e-mail] March 13, 2023, 3:33 p.m. UTC | #1

This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=729478

---Test result---

Test Summary:
CheckPatch                    PASS      4.08 seconds
GitLint                       FAIL      1.13 seconds
SubjectPrefix                 FAIL      0.57 seconds
BuildKernel                   PASS      32.11 seconds
CheckAllWarning               PASS      35.46 seconds
CheckSparse                   PASS      40.17 seconds
CheckSmatch                   PASS      108.38 seconds
BuildKernel32                 PASS      31.69 seconds
TestRunnerSetup               PASS      447.01 seconds
TestRunner_l2cap-tester       PASS      17.47 seconds
TestRunner_iso-tester         PASS      17.68 seconds
TestRunner_bnep-tester        PASS      5.80 seconds
TestRunner_mgmt-tester        PASS      113.07 seconds
TestRunner_rfcomm-tester      PASS      9.23 seconds
TestRunner_sco-tester         PASS      8.41 seconds
TestRunner_ioctl-tester       PASS      9.93 seconds
TestRunner_mesh-tester        PASS      7.26 seconds
TestRunner_smp-tester         PASS      8.25 seconds
TestRunner_userchan-tester    PASS      5.99 seconds
IncrementalBuild              PASS      37.51 seconds

Details
##############################
Test: GitLint - FAIL
Desc: Run gitlint
Output:
[v10,2/3] dt-bindings: net: bluetooth: Add NXP bluetooth support

WARNING: I3 - ignore-body-lines: gitlint will be switching from using Python regex 'match' (match beginning) to 'search' (match anywhere) semantics. Please review your ignore-body-lines.regex option accordingly. To remove this warning, set general.regex-style-search=True. More details: https://jorisroovers.github.io/gitlint/configuration/#regex-style-search
19: B1 Line exceeds max length (87>80): " create mode 100644 Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml"
##############################
Test: SubjectPrefix - FAIL
Desc: Check subject contains "Bluetooth" prefix
Output:
"Bluetooth: " prefix is not specified in the subject
"Bluetooth: " prefix is not specified in the subject


---
Regards,
Linux Bluetooth

Simon Horman March 14, 2023, 10:35 a.m. UTC | #2

On Mon, Mar 13, 2023 at 08:10:26PM +0530, Neeraj Sanjay Kale wrote:
> 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: Neeraj Sanjay Kale <[e-mail]>
> ---
> v3: Add details to the commit message. Replace ENOTSUPP with
> EOPNOTSUPP. (Greg KH, Leon Romanovsky)
> v9: Replace all instances of ENOTSUPP with EOPNOTSUPP.
> (Simon Horman)

I'm all for this change. But perhaps it should be a separate clean-up patch,
that precedes the feature-patch which adds the new method. I think that
would make things a bit clearer.

...

> diff --git a/include/linux/serdev.h b/include/linux/serdev.h
> index 66f624fc618c..c065ef1c82f1 100644
> --- a/include/linux/serdev.h
> +++ b/include/linux/serdev.h

...

> @@ -202,6 +203,7 @@ 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 *);
> @@ -255,6 +257,10 @@ static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set,
>  {
>  	return -ENOTSUPP;

It seems that you might have missed at least this one.

>  }
> +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)
>  {
> -- 
> 2.34.1
>

Patch

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 0180e1e4e75d..dc540e74c64d 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -366,7 +366,7 @@  int serdev_device_set_parity(struct serdev_device *serdev,
 	struct serdev_controller *ctrl = serdev->ctrl;
 
 	if (!ctrl || !ctrl->ops->set_parity)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	return ctrl->ops->set_parity(ctrl, parity);
 }
@@ -388,7 +388,7 @@  int serdev_device_get_tiocm(struct serdev_device *serdev)
 	struct serdev_controller *ctrl = serdev->ctrl;
 
 	if (!ctrl || !ctrl->ops->get_tiocm)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	return ctrl->ops->get_tiocm(ctrl);
 }
@@ -399,12 +399,23 @@  int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
 	struct serdev_controller *ctrl = serdev->ctrl;
 
 	if (!ctrl || !ctrl->ops->set_tiocm)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	return ctrl->ops->set_tiocm(ctrl, set, 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);
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index d367803e2044..8033ef19669c 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -231,7 +231,7 @@  static int ttyport_get_tiocm(struct serdev_controller *ctrl)
 	struct tty_struct *tty = serport->tty;
 
 	if (!tty->ops->tiocmget)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	return tty->ops->tiocmget(tty);
 }
@@ -242,11 +242,22 @@  static int ttyport_set_tiocm(struct serdev_controller *ctrl, unsigned int set, u
 	struct tty_struct *tty = serport->tty;
 
 	if (!tty->ops->tiocmset)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	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,
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 66f624fc618c..c065ef1c82f1 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -92,6 +92,7 @@  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);
 };
 
 /**
@@ -202,6 +203,7 @@  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 *);
@@ -255,6 +257,10 @@  static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set,
 {
 	return -ENOTSUPP;
 }
+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)
 {