int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
{
struct uart_state *state = drv->state + uport->line;
struct tty_port *port = &state->port;
struct device *tty_dev;
struct uart_match match = {uport, drv};
mutex_lock(&port->mutex);
tty_dev = device_find_child(uport->dev, &match, serial_match_port);
if (device_may_wakeup(tty_dev)) {
if (!enable_irq_wake(uport->irq))
uport->irq_wake = 1;
put_device(tty_dev);
mutex_unlock(&port->mutex);
return 0;
}
if (console_suspend_enabled || !uart_console(uport))
uport->suspended = 1;
if (port->flags & ASYNC_INITIALIZED) {
const struct uart_ops *ops = uport->ops;
int tries;
if (console_suspend_enabled || !uart_console(uport)) {
set_bit(ASYNCB_SUSPENDED, &port->flags);
clear_bit(ASYNCB_INITIALIZED, &port->flags);
spin_lock_irq(&uport->lock);
ops->stop_tx(uport);
ops->set_mctrl(uport, 0);
ops->stop_rx(uport);
spin_unlock_irq(&uport->lock);
}
for (tries = 3; !ops->tx_empty(uport) && tries; tries--)
msleep(10);
if (!tries)
printk(KERN_ERR "%s%s%s%d: Unable to drain "
"transmitter\n",
uport->dev ? dev_name(uport->dev) : "",
uport->dev ? ": " : "",
drv->dev_name,
drv->tty_driver->name_base + uport->line);
if (console_suspend_enabled || !uart_console(uport))
ops->shutdown(uport);
}
if (console_suspend_enabled && uart_console(uport))
console_stop(uport->cons);
if (console_suspend_enabled || !uart_console(uport))
uart_change_pm(state, 3);
mutex_unlock(&port->mutex);
return 0;
}
static void uart_close(struct tty_struct *tty, struct file *filp)
{
struct uart_state *state = tty->driver_data;
struct tty_port *port;
struct uart_port *uport;
unsigned long flags;
if (!state)
return;
uport = state->uart_port;
port = &state->port;
pr_debug("uart_close(%d) called\n", uport->line);
if (tty_port_close_start(port, tty, filp) == 0)
return;
if (port->flags & ASYNC_INITIALIZED) {
unsigned long flags;
spin_lock_irqsave(&uport->lock, flags);
uport->ops->stop_rx(uport);
spin_unlock_irqrestore(&uport->lock, flags);
uart_wait_until_sent(tty, uport->timeout);
}
mutex_lock(&port->mutex);
uart_shutdown(tty, state);
uart_flush_buffer(tty);
tty_ldisc_flush(tty);
tty_port_tty_set(port, NULL);
spin_lock_irqsave(&port->lock, flags);
tty->closing = 0;
if (port->blocked_open) {
spin_unlock_irqrestore(&port->lock, flags);
if (port->close_delay)
msleep_interruptible(
jiffies_to_msecs(port->close_delay));
spin_lock_irqsave(&port->lock, flags);
} else if (!uart_console(uport)) {
spin_unlock_irqrestore(&port->lock, flags);
uart_change_pm(state, 3);
spin_lock_irqsave(&port->lock, flags);
}
clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
clear_bit(ASYNCB_CLOSING, &port->flags);
spin_unlock_irqrestore(&port->lock, flags);
wake_up_interruptible(&port->open_wait);
wake_up_interruptible(&port->close_wait);
mutex_unlock(&port->mutex);
}
static void
uart_configure_port(struct uart_driver *drv, struct uart_state *state,
struct uart_port *port)
{
unsigned int flags;
if (!port->iobase && !port->mapbase && !port->membase)
return;
flags = 0;
if (port->flags & UPF_AUTO_IRQ)
flags |= UART_CONFIG_IRQ;
if (port->flags & UPF_BOOT_AUTOCONF) {
if (!(port->flags & UPF_FIXED_TYPE)) {
port->type = PORT_UNKNOWN;
flags |= UART_CONFIG_TYPE;
}
port->ops->config_port(port, flags);
}
if (port->type != PORT_UNKNOWN) {
unsigned long flags;
uart_report_port(drv, port);
uart_change_pm(state, 0);
spin_lock_irqsave(&port->lock, flags);
port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
spin_unlock_irqrestore(&port->lock, flags);
if (port->cons && !(port->cons->flags & CON_ENABLED))
register_console(port->cons);
if (!uart_console(port))
uart_change_pm(state, 3);
}
}
static int uart_open(struct tty_struct *tty, struct file *filp)
{
struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state;
int retval, line = tty->index;
struct uart_state *state = drv->state + line;
struct tty_port *port = &state->port;
pr_debug("uart_open(%d) called\n", line);
if (mutex_lock_interruptible(&port->mutex)) {
retval = -ERESTARTSYS;
goto end;
}
port->count++;
if (!state->uart_port || state->uart_port->flags & UPF_DEAD) {
retval = -ENXIO;
goto err_dec_count;
}
tty->driver_data = state;
state->uart_port->state = state;
tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
tty_port_tty_set(port, tty);
if (tty_hung_up_p(filp)) {
retval = -EAGAIN;
goto err_dec_count;
}
if (port->count == 1)
uart_change_pm(state, 0);
retval = uart_startup(tty, state, 0);
mutex_unlock(&port->mutex);
if (retval == 0)
retval = tty_port_block_til_ready(port, tty, filp);
end:
return retval;
err_dec_count:
port->count--;
mutex_unlock(&port->mutex);
goto end;
}
int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
{
struct uart_state *state = drv->state + uport->line;
struct tty_port *port = &state->port;
struct device *tty_dev;
struct uart_match match = {uport, drv};
struct ktermios termios;
mutex_lock(&port->mutex);
tty_dev = device_find_child(uport->dev, &match, serial_match_port);
if (!uport->suspended && device_may_wakeup(tty_dev)) {
if (uport->irq_wake) {
disable_irq_wake(uport->irq);
uport->irq_wake = 0;
}
put_device(tty_dev);
mutex_unlock(&port->mutex);
return 0;
}
put_device(tty_dev);
uport->suspended = 0;
if (uart_console(uport)) {
memset(&termios, 0, sizeof(struct ktermios));
termios.c_cflag = uport->cons->cflag;
if (port->tty && port->tty->termios && termios.c_cflag == 0)
termios = *(port->tty->termios);
if (console_suspend_enabled)
uart_change_pm(state, 0);
uport->ops->set_termios(uport, &termios, NULL);
if (console_suspend_enabled)
console_start(uport->cons);
}
if (port->flags & ASYNC_SUSPENDED) {
const struct uart_ops *ops = uport->ops;
int ret;
uart_change_pm(state, 0);
spin_lock_irq(&uport->lock);
ops->set_mctrl(uport, 0);
spin_unlock_irq(&uport->lock);
if (console_suspend_enabled || !uart_console(uport)) {
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);
ops->start_tx(uport);
spin_unlock_irq(&uport->lock);
set_bit(ASYNCB_INITIALIZED, &port->flags);
} else {
uart_shutdown(tty, state);
}
}
clear_bit(ASYNCB_SUSPENDED, &port->flags);
}
mutex_unlock(&port->mutex);
return 0;
}
static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i)
{
struct uart_state *state = drv->state + i;
struct tty_port *port = &state->port;
int pm_state;
struct uart_port *uport = state->uart_port;
char stat_buf[32];
unsigned int status;
int mmio;
if (!uport)
return;
mmio = uport->iotype >= UPIO_MEM;
seq_printf(m, "%d: uart:%s %s%08llX irq:%d",
uport->line, uart_type(uport),
mmio ? "mmio:0x" : "port:",
mmio ? (unsigned long long)uport->mapbase
: (unsigned long long)uport->iobase,
uport->irq);
if (uport->type == PORT_UNKNOWN) {
seq_putc(m, '\n');
return;
}
if (capable(CAP_SYS_ADMIN)) {
mutex_lock(&port->mutex);
pm_state = state->pm_state;
if (pm_state)
uart_change_pm(state, 0);
spin_lock_irq(&uport->lock);
status = uport->ops->get_mctrl(uport);
spin_unlock_irq(&uport->lock);
if (pm_state)
uart_change_pm(state, pm_state);
mutex_unlock(&port->mutex);
seq_printf(m, " tx:%d rx:%d",
uport->icount.tx, uport->icount.rx);
if (uport->icount.frame)
seq_printf(m, " fe:%d",
uport->icount.frame);
if (uport->icount.parity)
seq_printf(m, " pe:%d",
uport->icount.parity);
if (uport->icount.brk)
seq_printf(m, " brk:%d",
uport->icount.brk);
if (uport->icount.overrun)
seq_printf(m, " oe:%d",
uport->icount.overrun);
#define INFOBIT(bit, str) \
if (uport->mctrl & (bit)) \
strncat(stat_buf, (str), sizeof(stat_buf) - \
strlen(stat_buf) - 2)
#define STATBIT(bit, str) \
if (status & (bit)) \
strncat(stat_buf, (str), sizeof(stat_buf) - \
strlen(stat_buf) - 2)
stat_buf[0] = '\0';
stat_buf[1] = '\0';
INFOBIT(TIOCM_RTS, "|RTS");
STATBIT(TIOCM_CTS, "|CTS");
INFOBIT(TIOCM_DTR, "|DTR");
STATBIT(TIOCM_DSR, "|DSR");
STATBIT(TIOCM_CAR, "|CD");
STATBIT(TIOCM_RNG, "|RI");
if (stat_buf[0])
stat_buf[0] = ' ';
seq_puts(m, stat_buf);
}
seq_putc(m, '\n');
#undef STATBIT
#undef INFOBIT
}