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Mon, 13 Mar 2023 14:41:09 +0000 From: Neeraj Sanjay Kale To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com, gregkh@linuxfoundation.org, jirislaby@kernel.org, alok.a.tiwari@oracle.com, hdanton@sina.com, ilpo.jarvinen@linux.intel.com, leon@kernel.org, simon.horman@corigine.com Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-serial@vger.kernel.org, amitkumar.karwar@nxp.com, rohit.fule@nxp.com, sherry.sun@nxp.com, neeraj.sanjaykale@nxp.com Subject: [PATCH v10 1/3] serdev: Add method to assert break signal over tty UART port Date: Mon, 13 Mar 2023 20:10:26 +0530 Message-Id: <20230313144028.3156825-2-neeraj.sanjaykale@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230313144028.3156825-1-neeraj.sanjaykale@nxp.com> References: <20230313144028.3156825-1-neeraj.sanjaykale@nxp.com> X-ClientProxiedBy: SG2PR02CA0115.apcprd02.prod.outlook.com (2603:1096:4:92::31) To AM9PR04MB8603.eurprd04.prod.outlook.com (2603:10a6:20b:43a::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM9PR04MB8603:EE_|PA4PR04MB7744:EE_ X-MS-Office365-Filtering-Correlation-Id: 36b358c5-ab51-4d50-34bc-08db23d0fbca X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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 --- 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(-) 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) {