sierra.c

linux 内核源代码

static void sierra_indat_callback(struct urb *urb)
{
	int err;
	int endpoint;
	struct usb_serial_port *port;
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;

	dbg("%s: %p", __FUNCTION__, urb);

	endpoint = usb_pipeendpoint(urb->pipe);
	port = (struct usb_serial_port *) urb->context;

	if (status) {
		dbg("%s: nonzero status: %d on endpoint %02x.",
		    __FUNCTION__, status, endpoint);
	} else {
		tty = port->tty;
		if (urb->actual_length) {
			tty_buffer_request_room(tty, urb->actual_length);
			tty_insert_flip_string(tty, data, urb->actual_length);
			tty_flip_buffer_push(tty);
		} else {
			dbg("%s: empty read urb received", __FUNCTION__);
		}

		/* Resubmit urb so we continue receiving */
		if (port->open_count && status != -ESHUTDOWN) {
			err = usb_submit_urb(urb, GFP_ATOMIC);
			if (err)
				dev_err(&port->dev, "resubmit read urb failed."
					"(%d)\n", err);
		}
	}
	return;
}

static void sierra_instat_callback(struct urb *urb)
{
	int err;
	int status = urb->status;
	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
	struct sierra_port_private *portdata = usb_get_serial_port_data(port);
	struct usb_serial *serial = port->serial;

	dbg("%s", __FUNCTION__);
	dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);

	if (status == 0) {
		struct usb_ctrlrequest *req_pkt =
				(struct usb_ctrlrequest *)urb->transfer_buffer;

		if (!req_pkt) {
			dbg("%s: NULL req_pkt\n", __FUNCTION__);
			return;
		}
		if ((req_pkt->bRequestType == 0xA1) &&
				(req_pkt->bRequest == 0x20)) {
			int old_dcd_state;
			unsigned char signals = *((unsigned char *)
					urb->transfer_buffer +
					sizeof(struct usb_ctrlrequest));

			dbg("%s: signal x%x", __FUNCTION__, signals);

			old_dcd_state = portdata->dcd_state;
			portdata->cts_state = 1;
			portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
			portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
			portdata->ri_state = ((signals & 0x08) ? 1 : 0);

			if (port->tty && !C_CLOCAL(port->tty) &&
					old_dcd_state && !portdata->dcd_state)
				tty_hangup(port->tty);
		} else {
			dbg("%s: type %x req %x", __FUNCTION__,
				req_pkt->bRequestType,req_pkt->bRequest);
		}
	} else
		dbg("%s: error %d", __FUNCTION__, status);

	/* Resubmit urb so we continue receiving IRQ data */
	if (status != -ESHUTDOWN) {
		urb->dev = serial->dev;
		err = usb_submit_urb(urb, GFP_ATOMIC);
		if (err)
			dbg("%s: resubmit intr urb failed. (%d)",
				__FUNCTION__, err);
	}
}

static int sierra_write_room(struct usb_serial_port *port)
{
	struct sierra_port_private *portdata = usb_get_serial_port_data(port);
	unsigned long flags;

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

	/* try to give a good number back based on if we have any free urbs at
	 * this point in time */
	spin_lock_irqsave(&portdata->lock, flags);
	if (portdata->outstanding_urbs > N_OUT_URB * 2 / 3) {
		spin_unlock_irqrestore(&portdata->lock, flags);
		dbg("%s - write limit hit\n", __FUNCTION__);
		return 0;
	}
	spin_unlock_irqrestore(&portdata->lock, flags);

	return 2048;
}

static int sierra_chars_in_buffer(struct usb_serial_port *port)
{
	dbg("%s - port %d", __FUNCTION__, port->number);

	/*
	 * We can't really account for how much data we
	 * have sent out, but hasn't made it through to the
	 * device as we can't see the backend here, so just
	 * tell the tty layer that everything is flushed.
	 */
	return 0;
}

static int sierra_open(struct usb_serial_port *port, struct file *filp)
{
	struct sierra_port_private *portdata;
	struct usb_serial *serial = port->serial;
	int i;
	struct urb *urb;
	int result;

	portdata = usb_get_serial_port_data(port);

	dbg("%s", __FUNCTION__);

	/* Set some sane defaults */
	portdata->rts_state = 1;
	portdata->dtr_state = 1;

	/* Reset low level data toggle and start reading from endpoints */
	for (i = 0; i < N_IN_URB; i++) {
		urb = portdata->in_urbs[i];
		if (!urb)
			continue;
		if (urb->dev != serial->dev) {
			dbg("%s: dev %p != %p", __FUNCTION__,
				urb->dev, serial->dev);
			continue;
		}

		/*
		 * make sure endpoint data toggle is synchronized with the
		 * device
		 */
		usb_clear_halt(urb->dev, urb->pipe);

		result = usb_submit_urb(urb, GFP_KERNEL);
		if (result) {
			dev_err(&port->dev, "submit urb %d failed (%d) %d\n",
				i, result, urb->transfer_buffer_length);
		}
	}

	port->tty->low_latency = 1;

	sierra_send_setup(port);

	/* start up the interrupt endpoint if we have one */
	if (port->interrupt_in_urb) {
		result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
		if (result)
			dev_err(&port->dev, "submit irq_in urb failed %d\n",
				result);
	}
	return 0;
}

static void sierra_close(struct usb_serial_port *port, struct file *filp)
{
	int i;
	struct usb_serial *serial = port->serial;
	struct sierra_port_private *portdata;

	dbg("%s", __FUNCTION__);
	portdata = usb_get_serial_port_data(port);

	portdata->rts_state = 0;
	portdata->dtr_state = 0;

	if (serial->dev) {
		sierra_send_setup(port);

		/* Stop reading/writing urbs */
		for (i = 0; i < N_IN_URB; i++)
			usb_kill_urb(portdata->in_urbs[i]);
	}

	usb_kill_urb(port->interrupt_in_urb);

	port->tty = NULL;
}

static int sierra_startup(struct usb_serial *serial)
{
	struct usb_serial_port *port;
	struct sierra_port_private *portdata;
	struct urb *urb;
	int i;
	int j;

	dbg("%s", __FUNCTION__);

	/*Set Device mode to D0 */
	sierra_set_power_state(serial->dev, 0x0000);

	/* Now setup per port private data */
	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
		if (!portdata) {
			dbg("%s: kmalloc for sierra_port_private (%d) failed!.",
					__FUNCTION__, i);
			return -ENOMEM;
		}
		spin_lock_init(&portdata->lock);

		usb_set_serial_port_data(port, portdata);

		/* initialize the in urbs */
		for (j = 0; j < N_IN_URB; ++j) {
			urb = usb_alloc_urb(0, GFP_KERNEL);
			if (urb == NULL) {
				dbg("%s: alloc for in port failed.",
				    __FUNCTION__);
				continue;
			}
			/* Fill URB using supplied data. */
			usb_fill_bulk_urb(urb, serial->dev,
					  usb_rcvbulkpipe(serial->dev,
						port->bulk_in_endpointAddress),
					  portdata->in_buffer[j], IN_BUFLEN,
					  sierra_indat_callback, port);
			portdata->in_urbs[j] = urb;
		}
	}

	return 0;
}

static void sierra_shutdown(struct usb_serial *serial)
{
	int i, j;
	struct usb_serial_port *port;
	struct sierra_port_private *portdata;

	dbg("%s", __FUNCTION__);

	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		if (!port)
			continue;
		portdata = usb_get_serial_port_data(port);
		if (!portdata)
			continue;

		for (j = 0; j < N_IN_URB; j++) {
			usb_kill_urb(portdata->in_urbs[j]);
			usb_free_urb(portdata->in_urbs[j]);
			portdata->in_urbs[j] = NULL;
		}
		kfree(portdata);
		usb_set_serial_port_data(port, NULL);
	}
}

static struct usb_serial_driver sierra_1port_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"sierra1",
	},
	.description       = "Sierra USB modem (1 port)",
	.id_table          = id_table_1port,
	.usb_driver        = &sierra_driver,
	.num_interrupt_in  = NUM_DONT_CARE,
	.num_bulk_in       = 1,
	.num_bulk_out      = 1,
	.num_ports         = 1,
	.open              = sierra_open,
	.close             = sierra_close,
	.write             = sierra_write,
	.write_room        = sierra_write_room,
	.chars_in_buffer   = sierra_chars_in_buffer,
	.throttle          = sierra_rx_throttle,
	.unthrottle        = sierra_rx_unthrottle,
	.ioctl             = sierra_ioctl,
	.set_termios       = sierra_set_termios,
	.break_ctl         = sierra_break_ctl,
	.tiocmget          = sierra_tiocmget,
	.tiocmset          = sierra_tiocmset,
	.attach            = sierra_startup,
	.shutdown          = sierra_shutdown,
	.read_int_callback = sierra_instat_callback,
};

static struct usb_serial_driver sierra_3port_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"sierra3",
	},
	.description       = "Sierra USB modem (3 port)",
	.id_table          = id_table_3port,
	.usb_driver        = &sierra_driver,
	.num_interrupt_in  = NUM_DONT_CARE,
	.num_bulk_in       = 3,
	.num_bulk_out      = 3,
	.num_ports         = 3,
	.open              = sierra_open,
	.close             = sierra_close,
	.write             = sierra_write,
	.write_room        = sierra_write_room,
	.chars_in_buffer   = sierra_chars_in_buffer,
	.throttle          = sierra_rx_throttle,
	.unthrottle        = sierra_rx_unthrottle,
	.ioctl             = sierra_ioctl,
	.set_termios       = sierra_set_termios,
	.break_ctl         = sierra_break_ctl,
	.tiocmget          = sierra_tiocmget,
	.tiocmset          = sierra_tiocmset,
	.attach            = sierra_startup,
	.shutdown          = sierra_shutdown,
	.read_int_callback = sierra_instat_callback,
};

/* Functions used by new usb-serial code. */
static int __init sierra_init(void)
{
	int retval;
	retval = usb_serial_register(&sierra_1port_device);
	if (retval)
		goto failed_1port_device_register;
	retval = usb_serial_register(&sierra_3port_device);
	if (retval)
		goto failed_3port_device_register;


	retval = usb_register(&sierra_driver);
	if (retval)
		goto failed_driver_register;

	info(DRIVER_DESC ": " DRIVER_VERSION);

	return 0;

failed_driver_register:
	usb_serial_deregister(&sierra_3port_device);
failed_3port_device_register:
	usb_serial_deregister(&sierra_1port_device);
failed_1port_device_register:
	return retval;
}

static void __exit sierra_exit(void)
{
	usb_deregister (&sierra_driver);
	usb_serial_deregister(&sierra_1port_device);
	usb_serial_deregister(&sierra_3port_device);
}

module_init(sierra_init);
module_exit(sierra_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");

#ifdef CONFIG_USB_DEBUG
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages");
#endif