ti_usb_3410_5052.c

linux-2.6.15.6

	}

	/* set up port structures */
	for (i = 0; i < serial->num_ports; ++i) {
		tport = kmalloc(sizeof(struct ti_port), GFP_KERNEL);
		if (tport == NULL) {
			dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
			status = -ENOMEM;
			goto free_tports;
		}
		memset(tport, 0, sizeof(struct ti_port));
		spin_lock_init(&tport->tp_lock);
		tport->tp_uart_base_addr = (i == 0 ? TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
		tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
		tport->tp_closing_wait = closing_wait;
		init_waitqueue_head(&tport->tp_msr_wait);
		init_waitqueue_head(&tport->tp_write_wait);
		tport->tp_write_buf = ti_buf_alloc();
		if (tport->tp_write_buf == NULL) {
			dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
			kfree(tport);
			status = -ENOMEM;
			goto free_tports;
		}
		tport->tp_port = serial->port[i];
		tport->tp_tdev = tdev;
		usb_set_serial_port_data(serial->port[i], tport);
		tport->tp_uart_mode = 0;	/* default is RS232 */
	}
	
	return 0;

free_tports:
	for (--i; i>=0; --i) {
		tport = usb_get_serial_port_data(serial->port[i]);
		ti_buf_free(tport->tp_write_buf);
		kfree(tport);
		usb_set_serial_port_data(serial->port[i], NULL);
	}
free_tdev:
	kfree(tdev);
	usb_set_serial_data(serial, NULL);
	return status;
}


static void ti_shutdown(struct usb_serial *serial)
{
	int i;
	struct ti_device *tdev = usb_get_serial_data(serial);
	struct ti_port *tport;

	dbg("%s", __FUNCTION__);

	for (i=0; i < serial->num_ports; ++i) {
		tport = usb_get_serial_port_data(serial->port[i]);
		if (tport) {
			ti_buf_free(tport->tp_write_buf);
			kfree(tport);
			usb_set_serial_port_data(serial->port[i], NULL);
		}
	}

	kfree(tdev);
	usb_set_serial_data(serial, NULL);
}


static int ti_open(struct usb_serial_port *port, struct file *file)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct ti_device *tdev;
	struct usb_device *dev;
	struct urb *urb;
	int port_number;
	int status;
	__u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS | 
			     TI_PIPE_TIMEOUT_ENABLE | 
			     (TI_TRANSFER_TIMEOUT << 2));

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (tport == NULL)
		return -ENODEV;

	dev = port->serial->dev;
	tdev = tport->tp_tdev;

	/* only one open on any port on a device at a time */
	if (down_interruptible(&tdev->td_open_close_sem))
		return -ERESTARTSYS;

	if (port->tty)
		port->tty->low_latency = 
			(tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;

	port_number = port->number - port->serial->minor;

	memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));

	tport->tp_msr = 0;
	tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);

	/* start interrupt urb the first time a port is opened on this device */
	if (tdev->td_open_port_count == 0) {
		dbg("%s - start interrupt in urb", __FUNCTION__);
		urb = tdev->td_serial->port[0]->interrupt_in_urb;
		if (!urb) {
			dev_err(&port->dev, "%s - no interrupt urb\n", __FUNCTION__);
			status = -EINVAL;
			goto up_sem;
		}
		urb->complete = ti_interrupt_callback;
		urb->context = tdev;
		urb->dev = dev;
		status = usb_submit_urb(urb, GFP_KERNEL);
		if (status) {
			dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __FUNCTION__, status);
			goto up_sem;
		}
	}

	ti_set_termios(port, NULL);

	dbg("%s - sending TI_OPEN_PORT", __FUNCTION__);
	status = ti_command_out_sync(tdev, TI_OPEN_PORT,
		(__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
	if (status) {
		dev_err(&port->dev, "%s - cannot send open command, %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}

	dbg("%s - sending TI_START_PORT", __FUNCTION__);
	status = ti_command_out_sync(tdev, TI_START_PORT,
		(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
	if (status) {
		dev_err(&port->dev, "%s - cannot send start command, %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}

	dbg("%s - sending TI_PURGE_PORT", __FUNCTION__);
	status = ti_command_out_sync(tdev, TI_PURGE_PORT,
		(__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
	if (status) {
		dev_err(&port->dev, "%s - cannot clear input buffers, %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}
	status = ti_command_out_sync(tdev, TI_PURGE_PORT,
		(__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
	if (status) {
		dev_err(&port->dev, "%s - cannot clear output buffers, %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}

	/* reset the data toggle on the bulk endpoints to work around bug in
	 * host controllers where things get out of sync some times */
	usb_clear_halt(dev, port->write_urb->pipe);
	usb_clear_halt(dev, port->read_urb->pipe);

	ti_set_termios(port, NULL);

	dbg("%s - sending TI_OPEN_PORT (2)", __FUNCTION__);
	status = ti_command_out_sync(tdev, TI_OPEN_PORT,
		(__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
	if (status) {
		dev_err(&port->dev, "%s - cannot send open command (2), %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}

	dbg("%s - sending TI_START_PORT (2)", __FUNCTION__);
	status = ti_command_out_sync(tdev, TI_START_PORT,
		(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
	if (status) {
		dev_err(&port->dev, "%s - cannot send start command (2), %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}

	/* start read urb */
	dbg("%s - start read urb", __FUNCTION__);
	urb = port->read_urb;
	if (!urb) {
		dev_err(&port->dev, "%s - no read urb\n", __FUNCTION__);
		status = -EINVAL;
		goto unlink_int_urb;
	}
	tport->tp_read_urb_state = TI_READ_URB_RUNNING;
	urb->complete = ti_bulk_in_callback;
	urb->context = tport;
	urb->dev = dev;
	status = usb_submit_urb(urb, GFP_KERNEL);
	if (status) {
		dev_err(&port->dev, "%s - submit read urb failed, %d\n", __FUNCTION__, status);
		goto unlink_int_urb;
	}

	tport->tp_is_open = 1;
	++tdev->td_open_port_count;

	goto up_sem;

unlink_int_urb:
	if (tdev->td_open_port_count == 0)
		usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
up_sem:
	up(&tdev->td_open_close_sem);
	dbg("%s - exit %d", __FUNCTION__, status);
	return status;
}


static void ti_close(struct usb_serial_port *port, struct file *file)
{
	struct ti_device *tdev;
	struct ti_port *tport;
	int port_number;
	int status;
	int do_up;

	dbg("%s - port %d", __FUNCTION__, port->number);
			 
	tdev = usb_get_serial_data(port->serial);
	tport = usb_get_serial_port_data(port);
	if (tdev == NULL || tport == NULL)
		return;

	tport->tp_is_open = 0;

	ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);

	usb_kill_urb(port->read_urb);
	usb_kill_urb(port->write_urb);
	tport->tp_write_urb_in_use = 0;

	port_number = port->number - port->serial->minor;

	dbg("%s - sending TI_CLOSE_PORT", __FUNCTION__);
	status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
		     (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
	if (status)
		dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __FUNCTION__, status);

	/* if down is interrupted, continue anyway */
	do_up = !down_interruptible(&tdev->td_open_close_sem);
	--tport->tp_tdev->td_open_port_count;
	if (tport->tp_tdev->td_open_port_count <= 0) {
		/* last port is closed, shut down interrupt urb */
		usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
		tport->tp_tdev->td_open_port_count = 0;
	}
	if (do_up)
		up(&tdev->td_open_close_sem);

	dbg("%s - exit", __FUNCTION__);
}


static int ti_write(struct usb_serial_port *port, const unsigned char *data,
	int count)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (count == 0) {
		dbg("%s - write request of 0 bytes", __FUNCTION__);
		return 0;
	}

	if (tport == NULL || !tport->tp_is_open)
		return -ENODEV;

	spin_lock_irqsave(&tport->tp_lock, flags);
	count = ti_buf_put(tport->tp_write_buf, data, count);
	spin_unlock_irqrestore(&tport->tp_lock, flags);

	ti_send(tport);

	return count;
}


static int ti_write_room(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	int room = 0;
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (tport == NULL)
		return -ENODEV;
	
	spin_lock_irqsave(&tport->tp_lock, flags);
	room = ti_buf_space_avail(tport->tp_write_buf);
	spin_unlock_irqrestore(&tport->tp_lock, flags);

	dbg("%s - returns %d", __FUNCTION__, room);
	return room;
}


static int ti_chars_in_buffer(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	int chars = 0;
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (tport == NULL)
		return -ENODEV;

	spin_lock_irqsave(&tport->tp_lock, flags);
	chars = ti_buf_data_avail(tport->tp_write_buf);
	spin_unlock_irqrestore(&tport->tp_lock, flags);

	dbg("%s - returns %d", __FUNCTION__, chars);
	return chars;
}


static void ti_throttle(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct tty_struct *tty;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (tport == NULL)
		return;

	tty = port->tty;
	if (!tty) {
		dbg("%s - no tty", __FUNCTION__);
		return;
	}

	if (I_IXOFF(tty) || C_CRTSCTS(tty))
		ti_stop_read(tport, tty);

}


static void ti_unthrottle(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	int status;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (tport == NULL)
		return;

	tty = port->tty;
	if (!tty) {
		dbg("%s - no tty", __FUNCTION__);
		return;
	}

	if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
		status = ti_restart_read(tport, tty);
		if (status)
			dev_err(&port->dev, "%s - cannot restart read, %d\n", __FUNCTION__, status);
	}
}


static int ti_ioctl(struct usb_serial_port *port, struct file *file,
	unsigned int cmd, unsigned long arg)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct async_icount cnow;
	struct async_icount cprev;

	dbg("%s - port %d, cmd = 0x%04X", __FUNCTION__, port->number, cmd);

	if (tport == NULL)
		return -ENODEV;

	switch (cmd) {
		case TIOCGSERIAL:
			dbg("%s - (%d) TIOCGSERIAL", __FUNCTION__, port->number);
			return ti_get_serial_info(tport, (struct serial_struct __user *)arg);
			break;

		case TIOCSSERIAL:
			dbg("%s - (%d) TIOCSSERIAL", __FUNCTION__, port->number);
			return ti_set_serial_info(tport, (struct serial_struct __user *)arg);
			break;

		case TIOCMIWAIT:
			dbg("%s - (%d) TIOCMIWAIT", __FUNCTION__, port->number);
			cprev = tport->tp_icount;
			while (1) {
				interruptible_sleep_on(&tport->tp_msr_wait);
				if (signal_pending(current))
					return -ERESTARTSYS;
				cnow = tport->tp_icount;
				if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
				    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
					return -EIO; /* no change => error */
				if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
				    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
				    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
				    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
					return 0;
				}
				cprev = cnow;
			}
			break;

		case TIOCGICOUNT:
			dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__, port->number, tport->tp_icount.rx, tport->tp_icount.tx);
			if (copy_to_user((void __user *)arg, &tport->tp_icount, sizeof(tport->tp_icount)))
				return -EFAULT;
			return 0;
	}

	return -ENOIOCTLCMD;
}


static void ti_set_termios(struct usb_serial_port *port,
	struct termios *old_termios)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct tty_struct *tty = port->tty;
	struct ti_uart_config *config;
	tcflag_t cflag,iflag;
	int baud;
	int status;
	int port_number = port->number - port->serial->minor;
	unsigned int mcr;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (!tty || !tty->termios) {
		dbg("%s - no tty or termios", __FUNCTION__);
		return;
	}

	cflag = tty->termios->c_cflag;
	iflag = tty->termios->c_iflag;

	if (old_termios && cflag == old_termios->c_cflag
	&& iflag == old_termios->c_iflag) {
		dbg("%s - nothing to change", __FUNCTION__);
		return;
	}

	dbg("%s - clfag %08x, iflag %08x", __FUNCTION__, cflag, iflag);

	if (old_termios)
		dbg("%s - old clfag %08x, old iflag %08x", __FUNCTION__, old_termios->c_cflag, old_termios->c_iflag);

	if (tport == NULL)
		return;

	config = kmalloc(sizeof(*config), GFP_KERNEL);
	if (!config) {