From 1c055e55a242a33e574e48be530e06770a210dcd Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 19 Feb 2024 03:26:26 +0000
Subject: [PATCH] add r8169 read mac form eeprom
---
kernel/drivers/tty/serial/serial_core.c | 467 +++++++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 346 insertions(+), 121 deletions(-)
diff --git a/kernel/drivers/tty/serial/serial_core.c b/kernel/drivers/tty/serial/serial_core.c
index fc1c7d5..76cdf3f 100644
--- a/kernel/drivers/tty/serial/serial_core.c
+++ b/kernel/drivers/tty/serial/serial_core.c
@@ -14,14 +14,17 @@
#include <linux/sched/signal.h>
#include <linux/init.h>
#include <linux/console.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/serial.h> /* for serial_state and serial_icounter_struct */
#include <linux/serial_core.h>
+#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/mutex.h>
+#include <linux/security.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
@@ -38,6 +41,11 @@
static struct lock_class_key port_lock_key;
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
+
+/*
+ * Max time with active RTS before/after data is sent.
+ */
+#define RS485_MAX_RTS_DELAY 100 /* msecs */
static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
struct ktermios *old_termios);
@@ -144,7 +152,7 @@
spin_lock_irqsave(&port->lock, flags);
old = port->mctrl;
port->mctrl = (old & ~clear) | set;
- if (old != port->mctrl)
+ if (old != port->mctrl && !(port->rs485.flags & SER_RS485_ENABLED))
port->ops->set_mctrl(port, port->mctrl);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -154,23 +162,10 @@
static void uart_port_dtr_rts(struct uart_port *uport, int raise)
{
- int rs485_on = uport->rs485_config &&
- (uport->rs485.flags & SER_RS485_ENABLED);
- int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND);
-
- if (raise) {
- if (rs485_on && RTS_after_send) {
- uart_set_mctrl(uport, TIOCM_DTR);
- uart_clear_mctrl(uport, TIOCM_RTS);
- } else {
- uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
- }
- } else {
- unsigned int clear = TIOCM_DTR;
-
- clear |= (!rs485_on || RTS_after_send) ? TIOCM_RTS : 0;
- uart_clear_mctrl(uport, clear);
- }
+ if (raise)
+ uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
+ else
+ uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
}
/*
@@ -667,6 +662,20 @@
}
/*
+ * This function performs low-level write of high-priority XON/XOFF
+ * character and accounting for it.
+ *
+ * Requires uart_port to implement .serial_out().
+ */
+void uart_xchar_out(struct uart_port *uport, int offset)
+{
+ serial_port_out(uport, offset, uport->x_char);
+ uport->icount.tx++;
+ uport->x_char = 0;
+}
+EXPORT_SYMBOL_GPL(uart_xchar_out);
+
+/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
@@ -792,17 +801,13 @@
return ret;
}
-static int uart_get_info_user(struct tty_port *port,
- struct serial_struct __user *retinfo)
+static int uart_get_info_user(struct tty_struct *tty,
+ struct serial_struct *ss)
{
- struct serial_struct tmp;
+ struct uart_state *state = tty->driver_data;
+ struct tty_port *port = &state->port;
- if (uart_get_info(port, &tmp) < 0)
- return -EIO;
-
- if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
- return -EFAULT;
- return 0;
+ return uart_get_info(port, ss) < 0 ? -EIO : 0;
}
static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
@@ -864,6 +869,12 @@
(new_flags & UPF_USR_MASK));
uport->custom_divisor = new_info->custom_divisor;
goto check_and_exit;
+ }
+
+ if (change_irq || change_port) {
+ retval = security_locked_down(LOCKDOWN_TIOCSSERIAL);
+ if (retval)
+ goto exit;
}
/*
@@ -1004,16 +1015,13 @@
return retval;
}
-static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state,
- struct serial_struct __user *newinfo)
+static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss)
{
- struct serial_struct new_serial;
+ struct uart_state *state = tty->driver_data;
struct tty_port *port = &state->port;
int retval;
- if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
- return -EFAULT;
-
+ down_write(&tty->termios_rwsem);
/*
* This semaphore protects port->count. It is also
* very useful to prevent opens. Also, take the
@@ -1022,8 +1030,9 @@
* under us.
*/
mutex_lock(&port->mutex);
- retval = uart_set_info(tty, port, state, &new_serial);
+ retval = uart_set_info(tty, port, state, ss);
mutex_unlock(&port->mutex);
+ up_write(&tty->termios_rwsem);
return retval;
}
@@ -1120,7 +1129,7 @@
return ret;
}
-static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
+static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state)
{
struct tty_port *port = &state->port;
struct uart_port *uport;
@@ -1305,18 +1314,103 @@
unsigned long flags;
if (!port->rs485_config)
- return -ENOIOCTLCMD;
+ return -ENOTTY;
if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
return -EFAULT;
+ /* pick sane settings if the user hasn't */
+ if (!(rs485.flags & SER_RS485_RTS_ON_SEND) ==
+ !(rs485.flags & SER_RS485_RTS_AFTER_SEND)) {
+ dev_warn_ratelimited(port->dev,
+ "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n",
+ port->name, port->line);
+ rs485.flags |= SER_RS485_RTS_ON_SEND;
+ rs485.flags &= ~SER_RS485_RTS_AFTER_SEND;
+ }
+
+ if (rs485.delay_rts_before_send > RS485_MAX_RTS_DELAY) {
+ rs485.delay_rts_before_send = RS485_MAX_RTS_DELAY;
+ dev_warn_ratelimited(port->dev,
+ "%s (%d): RTS delay before sending clamped to %u ms\n",
+ port->name, port->line, rs485.delay_rts_before_send);
+ }
+
+ if (rs485.delay_rts_after_send > RS485_MAX_RTS_DELAY) {
+ rs485.delay_rts_after_send = RS485_MAX_RTS_DELAY;
+ dev_warn_ratelimited(port->dev,
+ "%s (%d): RTS delay after sending clamped to %u ms\n",
+ port->name, port->line, rs485.delay_rts_after_send);
+ }
+ /* Return clean padding area to userspace */
+ memset(rs485.padding, 0, sizeof(rs485.padding));
+
spin_lock_irqsave(&port->lock, flags);
ret = port->rs485_config(port, &rs485);
+ if (!ret) {
+ port->rs485 = rs485;
+
+ /* Reset RTS and other mctrl lines when disabling RS485 */
+ if (!(rs485.flags & SER_RS485_ENABLED))
+ port->ops->set_mctrl(port, port->mctrl);
+ }
spin_unlock_irqrestore(&port->lock, flags);
if (ret)
return ret;
if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int uart_get_iso7816_config(struct uart_port *port,
+ struct serial_iso7816 __user *iso7816)
+{
+ unsigned long flags;
+ struct serial_iso7816 aux;
+
+ if (!port->iso7816_config)
+ return -ENOTTY;
+
+ spin_lock_irqsave(&port->lock, flags);
+ aux = port->iso7816;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ if (copy_to_user(iso7816, &aux, sizeof(aux)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int uart_set_iso7816_config(struct uart_port *port,
+ struct serial_iso7816 __user *iso7816_user)
+{
+ struct serial_iso7816 iso7816;
+ int i, ret;
+ unsigned long flags;
+
+ if (!port->iso7816_config)
+ return -ENOTTY;
+
+ if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
+ return -EFAULT;
+
+ /*
+ * There are 5 words reserved for future use. Check that userspace
+ * doesn't put stuff in there to prevent breakages in the future.
+ */
+ for (i = 0; i < 5; i++)
+ if (iso7816.reserved[i])
+ return -EINVAL;
+
+ spin_lock_irqsave(&port->lock, flags);
+ ret = port->iso7816_config(port, &iso7816);
+ spin_unlock_irqrestore(&port->lock, flags);
+ if (ret)
+ return ret;
+
+ if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816)))
return -EFAULT;
return 0;
@@ -1339,25 +1433,10 @@
* These ioctls don't rely on the hardware to be present.
*/
switch (cmd) {
- case TIOCGSERIAL:
- ret = uart_get_info_user(port, uarg);
- break;
-
- case TIOCSSERIAL:
- down_write(&tty->termios_rwsem);
- ret = uart_set_info_user(tty, state, uarg);
- up_write(&tty->termios_rwsem);
- break;
-
case TIOCSERCONFIG:
down_write(&tty->termios_rwsem);
ret = uart_do_autoconfig(tty, state);
up_write(&tty->termios_rwsem);
- break;
-
- case TIOCSERGWILD: /* obsolete */
- case TIOCSERSWILD: /* obsolete */
- ret = 0;
break;
}
@@ -1405,6 +1484,14 @@
case TIOCSRS485:
ret = uart_set_rs485_config(uport, uarg);
+ break;
+
+ case TIOCSISO7816:
+ ret = uart_set_iso7816_config(state->uart_port, uarg);
+ break;
+
+ case TIOCGISO7816:
+ ret = uart_get_iso7816_config(state->uart_port, uarg);
break;
default:
if (uport->ops->ioctl)
@@ -1473,7 +1560,7 @@
}
uart_change_speed(tty, state, old_termios);
- /* reload cflag from termios; port driver may have overriden flags */
+ /* reload cflag from termios; port driver may have overridden flags */
cflag = tty->termios.c_cflag;
/* Handle transition to B0 status */
@@ -1482,6 +1569,7 @@
/* Handle transition away from B0 status */
else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
unsigned int mask = TIOCM_DTR;
+
if (!(cflag & CRTSCTS) || !tty_throttled(tty))
mask |= TIOCM_RTS;
uart_set_mctrl(uport, mask);
@@ -1879,6 +1967,12 @@
}
#endif
+static void uart_port_spin_lock_init(struct uart_port *port)
+{
+ spin_lock_init(&port->lock);
+ lockdep_set_class(&port->lock, &port_lock_key);
+}
+
#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
/**
* uart_console_write - write a console message to a serial port
@@ -1935,8 +2029,10 @@
* console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options>
*
* The optional form
+ *
* earlycon=<name>,0x<addr>,<options>
* console=<name>,0x<addr>,<options>
+ *
* is also accepted; the returned @iotype will be UPIO_MEM.
*
* Returns 0 on success or -EINVAL on failure
@@ -2030,15 +2126,14 @@
static struct ktermios dummy;
/*
- * Ensure that the serial console lock is initialised
- * early.
- * If this port is a console, then the spinlock is already
- * initialised.
+ * Ensure that the serial-console lock is initialised early.
+ *
+ * Note that the console-enabled check is needed because of kgdboc,
+ * which can end up calling uart_set_options() for an already enabled
+ * console via tty_find_polling_driver() and uart_poll_init().
*/
- if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) {
- spin_lock_init(&port->lock);
- lockdep_set_class(&port->lock, &port_lock_key);
- }
+ if (!uart_console_enabled(port) && !port->console_reinit)
+ uart_port_spin_lock_init(port);
memset(&termios, 0, sizeof(struct ktermios));
@@ -2053,7 +2148,7 @@
switch (parity) {
case 'o': case 'O':
termios.c_cflag |= PARODD;
- /*fall through*/
+ fallthrough;
case 'e': case 'E':
termios.c_cflag |= PARENB;
break;
@@ -2149,7 +2244,8 @@
spin_lock_irq(&uport->lock);
ops->stop_tx(uport);
- ops->set_mctrl(uport, 0);
+ if (!(uport->rs485.flags & SER_RS485_ENABLED))
+ ops->set_mctrl(uport, 0);
ops->stop_rx(uport);
spin_unlock_irq(&uport->lock);
@@ -2228,17 +2324,22 @@
uart_change_pm(state, UART_PM_STATE_ON);
spin_lock_irq(&uport->lock);
- ops->set_mctrl(uport, 0);
+ if (!(uport->rs485.flags & SER_RS485_ENABLED))
+ ops->set_mctrl(uport, 0);
spin_unlock_irq(&uport->lock);
if (console_suspend_enabled || !uart_console(uport)) {
/* Protected by port mutex for now */
struct tty_struct *tty = port->tty;
+
ret = ops->startup(uport);
if (ret == 0) {
if (tty)
uart_change_speed(tty, state, NULL);
spin_lock_irq(&uport->lock);
- ops->set_mctrl(uport, uport->mctrl);
+ if (!(uport->rs485.flags & SER_RS485_ENABLED))
+ ops->set_mctrl(uport, uport->mctrl);
+ else
+ uport->rs485_config(uport, &uport->rs485);
ops->start_tx(uport);
spin_unlock_irq(&uport->lock);
tty_port_set_initialized(port, 1);
@@ -2336,7 +2437,10 @@
*/
spin_lock_irqsave(&port->lock, flags);
port->mctrl &= TIOCM_DTR;
- port->ops->set_mctrl(port, port->mctrl);
+ if (!(port->rs485.flags & SER_RS485_ENABLED))
+ port->ops->set_mctrl(port, port->mctrl);
+ else
+ port->rs485_config(port, &port->rs485);
spin_unlock_irqrestore(&port->lock, flags);
/*
@@ -2456,6 +2560,8 @@
#endif
.tiocmget = uart_tiocmget,
.tiocmset = uart_tiocmset,
+ .set_serial = uart_set_info_user,
+ .get_serial = uart_get_info_user,
.get_icount = uart_get_icount,
#ifdef CONFIG_CONSOLE_POLL
.poll_init = uart_poll_init,
@@ -2487,7 +2593,7 @@
int uart_register_driver(struct uart_driver *drv)
{
struct tty_driver *normal;
- int i, retval;
+ int i, retval = -ENOMEM;
BUG_ON(drv->state);
@@ -2539,7 +2645,7 @@
out_kfree:
kfree(drv->state);
out:
- return -ENOMEM;
+ return retval;
}
/**
@@ -2573,36 +2679,37 @@
}
EXPORT_SYMBOL_GPL(uart_console_device);
-static ssize_t uart_get_attr_uartclk(struct device *dev,
+static ssize_t uartclk_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16);
+ return sprintf(buf, "%d\n", tmp.baud_base * 16);
}
-static ssize_t uart_get_attr_type(struct device *dev,
+static ssize_t type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type);
+ return sprintf(buf, "%d\n", tmp.type);
}
-static ssize_t uart_get_attr_line(struct device *dev,
+
+static ssize_t line_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line);
+ return sprintf(buf, "%d\n", tmp.line);
}
-static ssize_t uart_get_attr_port(struct device *dev,
+static ssize_t port_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
@@ -2613,135 +2720,187 @@
ioaddr = tmp.port;
if (HIGH_BITS_OFFSET)
ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET;
- return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr);
+ return sprintf(buf, "0x%lX\n", ioaddr);
}
-static ssize_t uart_get_attr_irq(struct device *dev,
+static ssize_t irq_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq);
+ return sprintf(buf, "%d\n", tmp.irq);
}
-static ssize_t uart_get_attr_flags(struct device *dev,
+static ssize_t flags_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags);
+ return sprintf(buf, "0x%X\n", tmp.flags);
}
-static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev,
+static ssize_t xmit_fifo_size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size);
+ return sprintf(buf, "%d\n", tmp.xmit_fifo_size);
}
-
-static ssize_t uart_get_attr_close_delay(struct device *dev,
+static ssize_t close_delay_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay);
+ return sprintf(buf, "%d\n", tmp.close_delay);
}
-
-static ssize_t uart_get_attr_closing_wait(struct device *dev,
+static ssize_t closing_wait_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait);
+ return sprintf(buf, "%d\n", tmp.closing_wait);
}
-static ssize_t uart_get_attr_custom_divisor(struct device *dev,
+static ssize_t custom_divisor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor);
+ return sprintf(buf, "%d\n", tmp.custom_divisor);
}
-static ssize_t uart_get_attr_io_type(struct device *dev,
+static ssize_t io_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type);
+ return sprintf(buf, "%d\n", tmp.io_type);
}
-static ssize_t uart_get_attr_iomem_base(struct device *dev,
+static ssize_t iomem_base_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base);
+ return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base);
}
-static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev,
+static ssize_t iomem_reg_shift_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct serial_struct tmp;
struct tty_port *port = dev_get_drvdata(dev);
uart_get_info(port, &tmp);
- return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift);
+ return sprintf(buf, "%d\n", tmp.iomem_reg_shift);
}
-static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL);
-static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL);
-static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL);
-static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL);
-static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL);
-static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL);
-static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL);
-static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL);
-static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL);
-static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL);
-static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL);
-static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL);
-static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL);
+static ssize_t console_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct tty_port *port = dev_get_drvdata(dev);
+ struct uart_state *state = container_of(port, struct uart_state, port);
+ struct uart_port *uport;
+ bool console = false;
+
+ mutex_lock(&port->mutex);
+ uport = uart_port_check(state);
+ if (uport)
+ console = uart_console_enabled(uport);
+ mutex_unlock(&port->mutex);
+
+ return sprintf(buf, "%c\n", console ? 'Y' : 'N');
+}
+
+static ssize_t console_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct tty_port *port = dev_get_drvdata(dev);
+ struct uart_state *state = container_of(port, struct uart_state, port);
+ struct uart_port *uport;
+ bool oldconsole, newconsole;
+ int ret;
+
+ ret = kstrtobool(buf, &newconsole);
+ if (ret)
+ return ret;
+
+ mutex_lock(&port->mutex);
+ uport = uart_port_check(state);
+ if (uport) {
+ oldconsole = uart_console_enabled(uport);
+ if (oldconsole && !newconsole) {
+ ret = unregister_console(uport->cons);
+ } else if (!oldconsole && newconsole) {
+ if (uart_console(uport)) {
+ uport->console_reinit = 1;
+ register_console(uport->cons);
+ } else {
+ ret = -ENOENT;
+ }
+ }
+ } else {
+ ret = -ENXIO;
+ }
+ mutex_unlock(&port->mutex);
+
+ return ret < 0 ? ret : count;
+}
+
+static DEVICE_ATTR_RO(uartclk);
+static DEVICE_ATTR_RO(type);
+static DEVICE_ATTR_RO(line);
+static DEVICE_ATTR_RO(port);
+static DEVICE_ATTR_RO(irq);
+static DEVICE_ATTR_RO(flags);
+static DEVICE_ATTR_RO(xmit_fifo_size);
+static DEVICE_ATTR_RO(close_delay);
+static DEVICE_ATTR_RO(closing_wait);
+static DEVICE_ATTR_RO(custom_divisor);
+static DEVICE_ATTR_RO(io_type);
+static DEVICE_ATTR_RO(iomem_base);
+static DEVICE_ATTR_RO(iomem_reg_shift);
+static DEVICE_ATTR_RW(console);
static struct attribute *tty_dev_attrs[] = {
+ &dev_attr_uartclk.attr,
&dev_attr_type.attr,
&dev_attr_line.attr,
&dev_attr_port.attr,
&dev_attr_irq.attr,
&dev_attr_flags.attr,
&dev_attr_xmit_fifo_size.attr,
- &dev_attr_uartclk.attr,
&dev_attr_close_delay.attr,
&dev_attr_closing_wait.attr,
&dev_attr_custom_divisor.attr,
&dev_attr_io_type.attr,
&dev_attr_iomem_base.attr,
&dev_attr_iomem_reg_shift.attr,
- NULL,
- };
+ &dev_attr_console.attr,
+ NULL
+};
static const struct attribute_group tty_dev_attr_group = {
.attrs = tty_dev_attrs,
- };
+};
/**
* uart_add_one_port - attach a driver-defined port structure
@@ -2793,13 +2952,12 @@
}
/*
- * If this port is a console, then the spinlock is already
+ * If this port is in use as a console then the spinlock is already
* initialised.
*/
- if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) {
- spin_lock_init(&uport->lock);
- lockdep_set_class(&uport->lock, &port_lock_key);
- }
+ if (!uart_console_enabled(uport))
+ uart_port_spin_lock_init(uport);
+
if (uport->cons && uport->dev)
of_console_check(uport->dev->of_node, uport->cons->name, uport->line);
@@ -2828,7 +2986,7 @@
*/
tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver,
uport->line, uport->dev, port, uport->tty_groups);
- if (likely(!IS_ERR(tty_dev))) {
+ if (!IS_ERR(tty_dev)) {
device_set_wakeup_capable(tty_dev, 1);
} else {
dev_err(uport->dev, "Cannot register tty device on line %d\n",
@@ -3050,6 +3208,56 @@
}
EXPORT_SYMBOL_GPL(uart_insert_char);
+#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
+static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE;
+
+static void uart_sysrq_on(struct work_struct *w)
+{
+ int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq);
+
+ sysrq_toggle_support(1);
+ pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n",
+ sysrq_toggle_seq_len, sysrq_toggle_seq);
+}
+static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);
+
+/**
+ * uart_try_toggle_sysrq - Enables SysRq from serial line
+ * @port: uart_port structure where char(s) after BREAK met
+ * @ch: new character in the sequence after received BREAK
+ *
+ * Enables magic SysRq when the required sequence is met on port
+ * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE).
+ *
+ * Returns false if @ch is out of enabling sequence and should be
+ * handled some other way, true if @ch was consumed.
+ */
+bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
+{
+ int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq);
+
+ if (!sysrq_toggle_seq_len)
+ return false;
+
+ BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX);
+ if (sysrq_toggle_seq[port->sysrq_seq] != ch) {
+ port->sysrq_seq = 0;
+ return false;
+ }
+
+ if (++port->sysrq_seq < sysrq_toggle_seq_len) {
+ port->sysrq = jiffies + SYSRQ_TIMEOUT;
+ return true;
+ }
+
+ schedule_work(&sysrq_enable_work);
+
+ port->sysrq = 0;
+ return true;
+}
+EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq);
+#endif
+
EXPORT_SYMBOL(uart_write_wakeup);
EXPORT_SYMBOL(uart_register_driver);
EXPORT_SYMBOL(uart_unregister_driver);
@@ -3060,14 +3268,15 @@
/**
* uart_get_rs485_mode() - retrieve rs485 properties for given uart
- * @dev: uart device
- * @rs485conf: output parameter
+ * @port: uart device's target port
*
* This function implements the device tree binding described in
* Documentation/devicetree/bindings/serial/rs485.txt.
*/
-void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf)
+int uart_get_rs485_mode(struct uart_port *port)
{
+ struct serial_rs485 *rs485conf = &port->rs485;
+ struct device *dev = port->dev;
u32 rs485_delay[2];
int ret;
@@ -3086,6 +3295,7 @@
* to get to a defined state with the following properties:
*/
rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED |
+ SER_RS485_TERMINATE_BUS |
SER_RS485_RTS_AFTER_SEND);
rs485conf->flags |= SER_RS485_RTS_ON_SEND;
@@ -3099,6 +3309,21 @@
rs485conf->flags &= ~SER_RS485_RTS_ON_SEND;
rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
}
+
+ /*
+ * Disabling termination by default is the safe choice: Else if many
+ * bus participants enable it, no communication is possible at all.
+ * Works fine for short cables and users may enable for longer cables.
+ */
+ port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(port->rs485_term_gpio)) {
+ ret = PTR_ERR(port->rs485_term_gpio);
+ port->rs485_term_gpio = NULL;
+ return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n");
+ }
+
+ return 0;
}
EXPORT_SYMBOL_GPL(uart_get_rs485_mode);
--
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