linux/drivers/tty/serdev/serdev-ttyport.c

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tty: add SPDX identifiers to all remaining files in drivers/tty/ It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the drivers/tty files files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Jiri Slaby <jslaby@suse.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: David Sterba <dsterba@suse.com> Cc: James Hogan <jhogan@kernel.org> Cc: Rob Herring <robh@kernel.org> Cc: Eric Anholt <eric@anholt.net> Cc: Stefan Wahren <stefan.wahren@i2se.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Ray Jui <rjui@broadcom.com> Cc: Scott Branden <sbranden@broadcom.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Joachim Eastwood <manabian@gmail.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Tobias Klauser <tklauser@distanz.ch> Cc: Russell King <linux@armlinux.org.uk> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Richard Genoud <richard.genoud@gmail.com> Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Baruch Siach <baruch@tkos.co.il> Cc: "Maciej W. Rozycki" <macro@linux-mips.org> Cc: "Uwe Kleine-König" <kernel@pengutronix.de> Cc: Pat Gefre <pfg@sgi.com> Cc: "Guilherme G. Piccoli" <gpiccoli@linux.vnet.ibm.com> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Vladimir Zapolskiy <vz@mleia.com> Cc: Sylvain Lemieux <slemieux.tyco@gmail.com> Cc: Carlo Caione <carlo@caione.org> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Andy Gross <andy.gross@linaro.org> Cc: David Brown <david.brown@linaro.org> Cc: "Andreas Färber" <afaerber@suse.de> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Laxman Dewangan <ldewangan@nvidia.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Cc: Barry Song <baohua@kernel.org> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Peter Korsgaard <jacmet@sunsite.dk> Cc: Timur Tabi <timur@tabi.org> Cc: Tony Prisk <linux@prisktech.co.nz> Cc: Michal Simek <michal.simek@xilinx.com> Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Jiri Slaby <jslaby@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-07 01:11:51 +08:00
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
*/
#include <linux/kernel.h>
#include <linux/serdev.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/poll.h>
#define SERPORT_ACTIVE 1
struct serport {
struct tty_port *port;
struct tty_struct *tty;
struct tty_driver *tty_drv;
int tty_idx;
unsigned long flags;
};
/*
* Callback functions from the tty port.
*/
static int ttyport_receive_buf(struct tty_port *port, const unsigned char *cp,
const unsigned char *fp, size_t count)
{
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);
int ret;
if (!test_bit(SERPORT_ACTIVE, &serport->flags))
return 0;
ret = serdev_controller_receive_buf(ctrl, cp, count);
dev_WARN_ONCE(&ctrl->dev, ret < 0 || ret > count,
"receive_buf returns %d (count = %zu)\n",
ret, count);
if (ret < 0)
return 0;
else if (ret > count)
return count;
return ret;
}
static void ttyport_write_wakeup(struct tty_port *port)
{
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty;
tty = tty_port_tty_get(port);
if (!tty)
return;
if (test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
test_bit(SERPORT_ACTIVE, &serport->flags))
serdev_controller_write_wakeup(ctrl);
/* Wake up any tty_wait_until_sent() */
wake_up_interruptible(&tty->write_wait);
tty_kref_put(tty);
}
static const struct tty_port_client_operations client_ops = {
.receive_buf = ttyport_receive_buf,
.write_wakeup = ttyport_write_wakeup,
};
/*
* Callback functions from the serdev core.
*/
static int ttyport_write_buf(struct serdev_controller *ctrl, const unsigned char *data, size_t len)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
if (!test_bit(SERPORT_ACTIVE, &serport->flags))
return 0;
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
return tty->ops->write(serport->tty, data, len);
}
static void ttyport_write_flush(struct serdev_controller *ctrl)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
tty_driver_flush_buffer(tty);
}
static int ttyport_write_room(struct serdev_controller *ctrl)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
return tty_write_room(tty);
}
static int ttyport_open(struct serdev_controller *ctrl)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty;
struct ktermios ktermios;
int ret;
tty = tty_init_dev(serport->tty_drv, serport->tty_idx);
if (IS_ERR(tty))
return PTR_ERR(tty);
serport->tty = tty;
if (!tty->ops->open || !tty->ops->close) {
ret = -ENODEV;
goto err_unlock;
}
ret = tty->ops->open(serport->tty, NULL);
if (ret)
goto err_close;
tty_unlock(serport->tty);
/* Bring the UART into a known 8 bits no parity hw fc state */
ktermios = tty->termios;
ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
INLCR | IGNCR | ICRNL | IXON);
ktermios.c_oflag &= ~OPOST;
ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
ktermios.c_cflag &= ~(CSIZE | PARENB);
ktermios.c_cflag |= CS8;
ktermios.c_cflag |= CRTSCTS;
/* Hangups are not supported so make sure to ignore carrier detect. */
ktermios.c_cflag |= CLOCAL;
tty_set_termios(tty, &ktermios);
set_bit(SERPORT_ACTIVE, &serport->flags);
return 0;
err_close:
tty->ops->close(tty, NULL);
err_unlock:
tty_unlock(tty);
tty_release_struct(tty, serport->tty_idx);
return ret;
}
static void ttyport_close(struct serdev_controller *ctrl)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
clear_bit(SERPORT_ACTIVE, &serport->flags);
tty_lock(tty);
if (tty->ops->close)
tty->ops->close(tty, NULL);
tty_unlock(tty);
tty_release_struct(tty, serport->tty_idx);
}
static unsigned int ttyport_set_baudrate(struct serdev_controller *ctrl, unsigned int speed)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
struct ktermios ktermios = tty->termios;
ktermios.c_cflag &= ~CBAUD;
tty_termios_encode_baud_rate(&ktermios, speed, speed);
/* tty_set_termios() return not checked as it is always 0 */
tty_set_termios(tty, &ktermios);
return ktermios.c_ospeed;
}
static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
struct ktermios ktermios = tty->termios;
if (enable)
ktermios.c_cflag |= CRTSCTS;
else
ktermios.c_cflag &= ~CRTSCTS;
tty_set_termios(tty, &ktermios);
}
static int ttyport_set_parity(struct serdev_controller *ctrl,
enum serdev_parity parity)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
struct ktermios ktermios = tty->termios;
ktermios.c_cflag &= ~(PARENB | PARODD | CMSPAR);
if (parity != SERDEV_PARITY_NONE) {
ktermios.c_cflag |= PARENB;
if (parity == SERDEV_PARITY_ODD)
ktermios.c_cflag |= PARODD;
}
tty_set_termios(tty, &ktermios);
if ((tty->termios.c_cflag & (PARENB | PARODD | CMSPAR)) !=
(ktermios.c_cflag & (PARENB | PARODD | CMSPAR)))
return -EINVAL;
return 0;
}
static void ttyport_wait_until_sent(struct serdev_controller *ctrl, long timeout)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
tty_wait_until_sent(tty, timeout);
}
static int ttyport_get_tiocm(struct serdev_controller *ctrl)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
if (!tty->ops->tiocmget)
return -ENOTSUPP;
return tty->ops->tiocmget(tty);
}
static int ttyport_set_tiocm(struct serdev_controller *ctrl, unsigned int set, unsigned int clear)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
if (!tty->ops->tiocmset)
return -ENOTSUPP;
return tty->ops->tiocmset(tty, set, clear);
}
static const struct serdev_controller_ops ctrl_ops = {
.write_buf = ttyport_write_buf,
.write_flush = ttyport_write_flush,
.write_room = ttyport_write_room,
.open = ttyport_open,
.close = ttyport_close,
.set_flow_control = ttyport_set_flow_control,
.set_parity = ttyport_set_parity,
.set_baudrate = ttyport_set_baudrate,
.wait_until_sent = ttyport_wait_until_sent,
.get_tiocm = ttyport_get_tiocm,
.set_tiocm = ttyport_set_tiocm,
};
struct device *serdev_tty_port_register(struct tty_port *port,
struct device *parent,
struct tty_driver *drv, int idx)
{
struct serdev_controller *ctrl;
struct serport *serport;
int ret;
if (!port || !drv || !parent)
return ERR_PTR(-ENODEV);
ctrl = serdev_controller_alloc(parent, sizeof(struct serport));
if (!ctrl)
return ERR_PTR(-ENOMEM);
serport = serdev_controller_get_drvdata(ctrl);
serport->port = port;
serport->tty_idx = idx;
serport->tty_drv = drv;
ctrl->ops = &ctrl_ops;
port->client_ops = &client_ops;
port->client_data = ctrl;
ret = serdev_controller_add(ctrl);
if (ret)
goto err_reset_data;
dev_info(&ctrl->dev, "tty port %s%d registered\n", drv->name, idx);
return &ctrl->dev;
err_reset_data:
port->client_data = NULL;
port->client_ops = &tty_port_default_client_ops;
serdev_controller_put(ctrl);
return ERR_PTR(ret);
}
int serdev_tty_port_unregister(struct tty_port *port)
{
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);
if (!serport)
return -ENODEV;
serdev_controller_remove(ctrl);
port->client_data = NULL;
port->client_ops = &tty_port_default_client_ops;
serdev_controller_put(ctrl);
return 0;
}