static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
{
struct uart_port *uport = state->uart_port;
struct tty_port *port = &state->port;
int flags, ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (mutex_lock_interruptible(&port->mutex))
return -ERESTARTSYS;
ret = -EBUSY;
if (tty_port_users(port) == 1) {
uart_shutdown(tty, state);
if (uport->type != PORT_UNKNOWN)
uport->ops->release_port(uport);
flags = UART_CONFIG_TYPE;
if (uport->flags & UPF_AUTO_IRQ)
flags |= UART_CONFIG_IRQ;
uport->ops->config_port(uport, flags);
ret = uart_startup(tty, state, 1);
}
mutex_unlock(&port->mutex);
return ret;
}
static int uart_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR uart_dev_t *dev = inode->i_private;
irqstate_t flags;
uart_takesem(&dev->closesem);
if (dev->open_count > 1)
{
dev->open_count--;
uart_givesem(&dev->closesem);
return OK;
}
/* There are no more references to the port */
dev->open_count = 0;
/* Stop accepting input */
uart_disablerxint(dev);
/* Now we wait for the transmit buffer to clear */
while (dev->xmit.head != dev->xmit.tail)
{
#ifndef CONFIG_DISABLE_SIGNALS
usleep(HALF_SECOND_USEC);
#else
up_mdelay(HALF_SECOND_MSEC);
#endif
}
/* And wait for the TX fifo to drain */
while (!uart_txempty(dev))
{
#ifndef CONFIG_DISABLE_SIGNALS
usleep(HALF_SECOND_USEC);
#else
up_mdelay(HALF_SECOND_MSEC);
#endif
}
/* Free the IRQ and disable the UART */
flags = irqsave(); /* Disable interrupts */
uart_detach(dev); /* Detach interrupts */
if (!dev->isconsole) /* Check for the serial console UART */
{
uart_shutdown(dev); /* Disable the UART */
}
irqrestore(flags);
uart_givesem(&dev->closesem);
return OK;
}
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);
}
struct debug_t *debug_init(void)
{
struct debug_t *debug;
uart_init();
debug = malloc(sizeof(struct debug_t));
debug->line = malloc(MAX_LINE_LENGHT);
debug->string = malloc(MAX_STRING_LENGHT);
debug->active = 1;
hello(debug);
debug_print_P(PSTR("\nActivate debug? (y/N): "), debug);
if (!debug_wait_for_y(debug)) {
uart_shutdown();
debug->active = 0;
free(debug->line);
free(debug->string);
}
return(debug);
}
static void uart_hangup(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
struct tty_port *port = &state->port;
unsigned long flags;
pr_debug("uart_hangup(%d)\n", state->uart_port->line);
mutex_lock(&port->mutex);
if (port->flags & ASYNC_NORMAL_ACTIVE) {
uart_flush_buffer(tty);
uart_shutdown(tty, state);
spin_lock_irqsave(&port->lock, flags);
port->count = 0;
clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
spin_unlock_irqrestore(&port->lock, flags);
tty_port_tty_set(port, NULL);
wake_up_interruptible(&port->open_wait);
wake_up_interruptible(&port->delta_msr_wait);
}
mutex_unlock(&port->mutex);
}
static int uart_open(FAR struct file *filep)
{
struct inode *inode = filep->f_inode;
uart_dev_t *dev = inode->i_private;
uint8_t tmp;
int ret = OK;
/* If the port is the middle of closing, wait until the close is finished */
uart_takesem(&dev->closesem);
/* Start up serial port */
/* Increment the count of references to the device. */
tmp = dev->open_count + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* Check if this is the first time that the driver has been opened. */
if (tmp == 1)
{
irqstate_t flags = irqsave();
/* If this is the console, then the UART has already been initialized. */
if (!dev->isconsole)
{
/* Perform one time hardware initialization */
ret = uart_setup(dev);
if (ret < 0)
{
irqrestore(flags);
goto errout_with_sem;
}
}
/* In any event, we do have to configure for interrupt driven mode of
* operation. Attach the hardware IRQ(s). Hmm.. should shutdown() the
* the device in the rare case that uart_attach() fails, tmp==1, and
* this is not the console.
*/
ret = uart_attach(dev);
if (ret < 0)
{
uart_shutdown(dev);
irqrestore(flags);
goto errout_with_sem;
}
/* Mark the io buffers empty */
dev->xmit.head = 0;
dev->xmit.tail = 0;
dev->recv.head = 0;
dev->recv.tail = 0;
/* Enable the RX interrupt */
uart_enablerxint(dev);
irqrestore(flags);
}
/* Save the new open count on success */
dev->open_count = tmp;
errout_with_sem:
uart_givesem(&dev->closesem);
return ret;
}
static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
struct serial_struct __user *newinfo)
{
struct serial_struct new_serial;
struct uart_port *uport = state->uart_port;
struct tty_port *port = &state->port;
unsigned long new_port;
unsigned int change_irq, change_port, closing_wait;
unsigned int old_custom_divisor, close_delay;
upf_t old_flags, new_flags;
int retval = 0;
if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
return -EFAULT;
new_port = new_serial.port;
if (HIGH_BITS_OFFSET)
new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
new_serial.irq = irq_canonicalize(new_serial.irq);
close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
ASYNC_CLOSING_WAIT_NONE :
msecs_to_jiffies(new_serial.closing_wait * 10);
mutex_lock(&port->mutex);
change_irq = !(uport->flags & UPF_FIXED_PORT)
&& new_serial.irq != uport->irq;
change_port = !(uport->flags & UPF_FIXED_PORT)
&& (new_port != uport->iobase ||
(unsigned long)new_serial.iomem_base != uport->mapbase ||
new_serial.hub6 != uport->hub6 ||
new_serial.io_type != uport->iotype ||
new_serial.iomem_reg_shift != uport->regshift ||
new_serial.type != uport->type);
old_flags = uport->flags;
new_flags = new_serial.flags;
old_custom_divisor = uport->custom_divisor;
if (!capable(CAP_SYS_ADMIN)) {
retval = -EPERM;
if (change_irq || change_port ||
(new_serial.baud_base != uport->uartclk / 16) ||
(close_delay != port->close_delay) ||
(closing_wait != port->closing_wait) ||
(new_serial.xmit_fifo_size &&
new_serial.xmit_fifo_size != uport->fifosize) ||
(((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0))
goto exit;
uport->flags = ((uport->flags & ~UPF_USR_MASK) |
(new_flags & UPF_USR_MASK));
uport->custom_divisor = new_serial.custom_divisor;
goto check_and_exit;
}
if (uport->ops->verify_port)
retval = uport->ops->verify_port(uport, &new_serial);
if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) ||
(new_serial.baud_base < 9600))
retval = -EINVAL;
if (retval)
goto exit;
if (change_port || change_irq) {
retval = -EBUSY;
if (tty_port_users(port) > 1)
goto exit;
uart_shutdown(tty, state);
}
if (change_port) {
unsigned long old_iobase, old_mapbase;
unsigned int old_type, old_iotype, old_hub6, old_shift;
old_iobase = uport->iobase;
old_mapbase = uport->mapbase;
old_type = uport->type;
old_hub6 = uport->hub6;
old_iotype = uport->iotype;
old_shift = uport->regshift;
if (old_type != PORT_UNKNOWN)
uport->ops->release_port(uport);
uport->iobase = new_port;
uport->type = new_serial.type;
uport->hub6 = new_serial.hub6;
uport->iotype = new_serial.io_type;
uport->regshift = new_serial.iomem_reg_shift;
uport->mapbase = (unsigned long)new_serial.iomem_base;
if (uport->type != PORT_UNKNOWN) {
retval = uport->ops->request_port(uport);
} else {
retval = 0;
}
if (retval && old_type != PORT_UNKNOWN) {
uport->iobase = old_iobase;
uport->type = old_type;
uport->hub6 = old_hub6;
uport->iotype = old_iotype;
uport->regshift = old_shift;
uport->mapbase = old_mapbase;
retval = uport->ops->request_port(uport);
if (retval)
uport->type = PORT_UNKNOWN;
retval = -EBUSY;
goto exit;
}
}
if (change_irq)
uport->irq = new_serial.irq;
if (!(uport->flags & UPF_FIXED_PORT))
uport->uartclk = new_serial.baud_base * 16;
uport->flags = (uport->flags & ~UPF_CHANGE_MASK) |
(new_flags & UPF_CHANGE_MASK);
uport->custom_divisor = new_serial.custom_divisor;
port->close_delay = close_delay;
port->closing_wait = closing_wait;
if (new_serial.xmit_fifo_size)
uport->fifosize = new_serial.xmit_fifo_size;
if (port->tty)
port->tty->low_latency =
(uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
check_and_exit:
retval = 0;
if (uport->type == PORT_UNKNOWN)
goto exit;
if (port->flags & ASYNC_INITIALIZED) {
if (((old_flags ^ uport->flags) & UPF_SPD_MASK) ||
old_custom_divisor != uport->custom_divisor) {
if (uport->flags & UPF_SPD_MASK) {
char buf[64];
printk(KERN_NOTICE
"%s sets custom speed on %s. This "
"is deprecated.\n", current->comm,
tty_name(port->tty, buf));
}
uart_change_speed(tty, state, NULL);
}
} else
retval = uart_startup(tty, state, 1);
exit:
mutex_unlock(&port->mutex);
return retval;
}
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 int uart_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR uart_dev_t *dev = inode->i_private;
irqstate_t flags;
/* Get exclusive access to the close semaphore (to synchronize open/close operations.
* NOTE: that we do not let this wait be interrupted by a signal. Technically, we
* should, but almost no one every checks the return value from close() so we avoid
* a potential memory leak by ignoring signals in this case.
*/
(void)uart_takesem(&dev->closesem, false);
if (dev->open_count > 1)
{
dev->open_count--;
uart_givesem(&dev->closesem);
return OK;
}
/* There are no more references to the port */
dev->open_count = 0;
/* Stop accepting input */
uart_disablerxint(dev);
/* Now we wait for the transmit buffer to clear */
while (dev->xmit.head != dev->xmit.tail)
{
#ifndef CONFIG_DISABLE_SIGNALS
usleep(HALF_SECOND_USEC);
#else
up_mdelay(HALF_SECOND_MSEC);
#endif
}
/* And wait for the TX fifo to drain */
while (!uart_txempty(dev))
{
#ifndef CONFIG_DISABLE_SIGNALS
usleep(HALF_SECOND_USEC);
#else
up_mdelay(HALF_SECOND_MSEC);
#endif
}
/* Free the IRQ and disable the UART */
flags = irqsave(); /* Disable interrupts */
uart_detach(dev); /* Detach interrupts */
if (!dev->isconsole) /* Check for the serial console UART */
{
uart_shutdown(dev); /* Disable the UART */
}
irqrestore(flags);
uart_givesem(&dev->closesem);
return OK;
}
static int uart_open(FAR struct file *filep)
{
struct inode *inode = filep->f_inode;
uart_dev_t *dev = inode->i_private;
uint8_t tmp;
int ret;
/* If the port is the middle of closing, wait until the close is finished.
* If a signal is received while we are waiting, then return EINTR.
*/
ret = uart_takesem(&dev->closesem, true);
if (ret < 0)
{
/* A signal received while waiting for the last close operation. */
return ret;
}
#ifdef CONFIG_SERIAL_REMOVABLE
/* If the removable device is no longer connected, refuse to open the
* device. We check this after obtaining the close semaphore because
* we might have been waiting when the device was disconnected.
*/
if (dev->disconnected)
{
ret = -ENOTCONN;
goto errout_with_sem;
}
#endif
/* Start up serial port */
/* Increment the count of references to the device. */
tmp = dev->open_count + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* Check if this is the first time that the driver has been opened. */
if (tmp == 1)
{
irqstate_t flags = irqsave();
/* If this is the console, then the UART has already been initialized. */
if (!dev->isconsole)
{
/* Perform one time hardware initialization */
ret = uart_setup(dev);
if (ret < 0)
{
irqrestore(flags);
goto errout_with_sem;
}
}
/* In any event, we do have to configure for interrupt driven mode of
* operation. Attach the hardware IRQ(s). Hmm.. should shutdown() the
* the device in the rare case that uart_attach() fails, tmp==1, and
* this is not the console.
*/
ret = uart_attach(dev);
if (ret < 0)
{
uart_shutdown(dev);
irqrestore(flags);
goto errout_with_sem;
}
/* Mark the io buffers empty */
dev->xmit.head = 0;
dev->xmit.tail = 0;
dev->recv.head = 0;
dev->recv.tail = 0;
/* Initialise termios state */
#ifdef CONFIG_SERIAL_TERMIOS
dev->tc_iflag = 0;
if (dev->isconsole == true)
{
/* Enable \n -> \r\n translation for the console */
dev->tc_oflag = OPOST | ONLCR;
}
else
{
dev->tc_oflag = 0;
}
#endif
/* Enable the RX interrupt */
uart_enablerxint(dev);
irqrestore(flags);
}
/* Save the new open count on success */
dev->open_count = tmp;
errout_with_sem:
uart_givesem(&dev->closesem);
return ret;
}
static int uart_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR uart_dev_t *dev = inode->i_private;
irqstate_t flags;
/* Get exclusive access to the close semaphore (to synchronize open/close operations.
* NOTE: that we do not let this wait be interrupted by a signal. Technically, we
* should, but almost no one every checks the return value from close() so we avoid
* a potential memory leak by ignoring signals in this case.
*/
(void)uart_takesem(&dev->closesem, false);
if (dev->open_count > 1)
{
dev->open_count--;
uart_givesem(&dev->closesem);
return OK;
}
/* There are no more references to the port */
dev->open_count = 0;
/* Stop accepting input */
uart_disablerxint(dev);
/* Now we wait for the transmit buffer to clear */
while (dev->xmit.head != dev->xmit.tail)
{
#ifndef CONFIG_DISABLE_SIGNALS
usleep(HALF_SECOND_USEC);
#else
up_mdelay(HALF_SECOND_MSEC);
#endif
}
/* And wait for the TX fifo to drain */
while (!uart_txempty(dev))
{
#ifndef CONFIG_DISABLE_SIGNALS
usleep(HALF_SECOND_USEC);
#else
up_mdelay(HALF_SECOND_MSEC);
#endif
}
/* Free the IRQ and disable the UART */
flags = irqsave(); /* Disable interrupts */
uart_detach(dev); /* Detach interrupts */
if (!dev->isconsole) /* Check for the serial console UART */
{
uart_shutdown(dev); /* Disable the UART */
}
irqrestore(flags);
/* We need to re-initialize the semaphores if this is the last close
* of the device, as the close might be caused by pthread_cancel() of
* a thread currently blocking on any of them.
*
* REVISIT: This logic *only* works in the case where the cancelled
* thread had the only reference to the serial driver. If there other
* references, then the this logic will not be executed and the
* semaphore count will still be incorrect.
*/
sem_reinit(&dev->xmitsem, 0, 0);
sem_reinit(&dev->recvsem, 0, 0);
sem_reinit(&dev->xmit.sem, 0, 1);
sem_reinit(&dev->recv.sem, 0, 1);
#ifndef CONFIG_DISABLE_POLL
sem_reinit(&dev->pollsem, 0, 1);
#endif
uart_givesem(&dev->closesem);
return OK;
}