usbserial.c

linux-2.4.29操作系统的源码

		    ((endpoint->bmAttributes & 3) == 0x02)) {
			/* we found a bulk in endpoint */
			dbg("found bulk in");
			bulk_in_endpoint[num_bulk_in] = endpoint;
			++num_bulk_in;
		}

		if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
		    ((endpoint->bmAttributes & 3) == 0x02)) {
			/* we found a bulk out endpoint */
			dbg("found bulk out");
			bulk_out_endpoint[num_bulk_out] = endpoint;
			++num_bulk_out;
		}
		
		if ((endpoint->bEndpointAddress & 0x80) &&
		    ((endpoint->bmAttributes & 3) == 0x03)) {
			/* we found a interrupt in endpoint */
			dbg("found interrupt in");
			interrupt_in_endpoint[num_interrupt_in] = endpoint;
			++num_interrupt_in;
		}
	}

#if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
	/* BEGIN HORRIBLE HACK FOR PL2303 */ 
	/* this is needed due to the looney way its endpoints are set up */
	if (((dev->descriptor.idVendor == PL2303_VENDOR_ID) &&
	     (dev->descriptor.idProduct == PL2303_PRODUCT_ID)) ||
	    ((dev->descriptor.idVendor == ATEN_VENDOR_ID) &&
	     (dev->descriptor.idProduct == ATEN_PRODUCT_ID))) {
		if (ifnum == 1) {
			/* check out the endpoints of the other interface*/
			struct usb_interface *other_iface;

			other_iface = &dev->actconfig->interface[ifnum ^ 1];
			iface_desc = &other_iface->altsetting[0];
			for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
				endpoint = &iface_desc->endpoint[i];
				if ((endpoint->bEndpointAddress & 0x80) &&
				    ((endpoint->bmAttributes & 3) == 0x03)) {
					/* we found a interrupt in endpoint */
					dbg("found interrupt in for Prolific device on separate interface");
					interrupt_in_endpoint[num_interrupt_in] = endpoint;
					++num_interrupt_in;
				}
			}
		}

		/* Now make sure the PL-2303 is configured correctly.
		 * If not, give up now and hope this hack will work
		 * properly during a later invocation of usb_serial_probe
		 */
		if (num_bulk_in == 0 || num_bulk_out == 0) {
			info("PL-2303 hack: descriptors matched but endpoints did not");
			return NULL;
		}
	}
	/* END HORRIBLE HACK FOR PL2303 */
#endif

	/* found all that we need */
	info("%s converter detected", type->name);

#ifdef CONFIG_USB_SERIAL_GENERIC
	if (type == &generic_device) {
		num_ports = num_bulk_out;
		if (num_ports == 0) {
			err("Generic device with no bulk out, not allowed.");
			return NULL;
		}
	} else
#endif
		num_ports = type->num_ports;

	serial = get_free_serial (num_ports, &minor);
	if (serial == NULL) {
		err("No more free serial devices");
		return NULL;
	}

	serial->dev = dev;
	serial->type = type;
	serial->interface = interface;
	serial->minor = minor;
	serial->num_ports = num_ports;
	serial->num_bulk_in = num_bulk_in;
	serial->num_bulk_out = num_bulk_out;
	serial->num_interrupt_in = num_interrupt_in;
	serial->vendor = dev->descriptor.idVendor;
	serial->product = dev->descriptor.idProduct;

	/* set up the endpoint information */
	for (i = 0; i < num_bulk_in; ++i) {
		endpoint = bulk_in_endpoint[i];
		port = &serial->port[i];
		port->read_urb = usb_alloc_urb (0);
		if (!port->read_urb) {
			err("No free urbs available");
			goto probe_error;
		}
		buffer_size = endpoint->wMaxPacketSize;
		port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
		port->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
		if (!port->bulk_in_buffer) {
			err("Couldn't allocate bulk_in_buffer");
			goto probe_error;
		}
		usb_fill_bulk_urb (port->read_urb, dev,
				   usb_rcvbulkpipe (dev,
					   	    endpoint->bEndpointAddress),
				   port->bulk_in_buffer, buffer_size,
				   ((serial->type->read_bulk_callback) ? 
				     serial->type->read_bulk_callback : 
				     generic_read_bulk_callback),
				   port);
	}

	for (i = 0; i < num_bulk_out; ++i) {
		endpoint = bulk_out_endpoint[i];
		port = &serial->port[i];
		port->write_urb = usb_alloc_urb(0);
		if (!port->write_urb) {
			err("No free urbs available");
			goto probe_error;
		}
		buffer_size = endpoint->wMaxPacketSize;
		port->bulk_out_size = buffer_size;
		port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
		port->bulk_out_buffer = kmalloc (buffer_size, GFP_KERNEL);
		if (!port->bulk_out_buffer) {
			err("Couldn't allocate bulk_out_buffer");
			goto probe_error;
		}
		usb_fill_bulk_urb (port->write_urb, dev,
				   usb_sndbulkpipe (dev,
						    endpoint->bEndpointAddress),
				   port->bulk_out_buffer, buffer_size, 
				   ((serial->type->write_bulk_callback) ? 
				     serial->type->write_bulk_callback : 
				     generic_write_bulk_callback),
				   port);
	}

	for (i = 0; i < num_interrupt_in; ++i) {
		endpoint = interrupt_in_endpoint[i];
		port = &serial->port[i];
		port->interrupt_in_urb = usb_alloc_urb(0);
		if (!port->interrupt_in_urb) {
			err("No free urbs available");
			goto probe_error;
		}
		buffer_size = endpoint->wMaxPacketSize;
		port->interrupt_in_endpointAddress = endpoint->bEndpointAddress;
		port->interrupt_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
		if (!port->interrupt_in_buffer) {
			err("Couldn't allocate interrupt_in_buffer");
			goto probe_error;
		}
		usb_fill_int_urb (port->interrupt_in_urb, dev, 
				  usb_rcvintpipe (dev,
						  endpoint->bEndpointAddress),
				  port->interrupt_in_buffer, buffer_size, 
				  serial->type->read_int_callback, port, 
				  endpoint->bInterval);
	}

	/* initialize some parts of the port structures */
	/* we don't use num_ports here cauz some devices have more endpoint pairs than ports */
	max_endpoints = max(num_bulk_in, num_bulk_out);
	max_endpoints = max(max_endpoints, num_interrupt_in);
	max_endpoints = max(max_endpoints, (int)serial->num_ports);
	dbg("%s - setting up %d port structures for this device", __FUNCTION__, max_endpoints);
	for (i = 0; i < max_endpoints; ++i) {
		port = &serial->port[i];
		port->number = i + serial->minor;
		port->serial = serial;
		port->magic = USB_SERIAL_PORT_MAGIC;
		port->tqueue.routine = port_softint;
		port->tqueue.data = port;
		init_MUTEX (&port->sem);
	}

	spin_lock_irqsave(&post_lock, flags);
	serial->ref = 1;
	spin_unlock_irqrestore(&post_lock, flags);

	/* if this device type has a startup function, call it */
	if (type->startup) {
		i = type->startup (serial);
		if (i < 0)
			goto startup_error;
		if (i > 0)
			return serial;
	}

	/* initialize the devfs nodes for this device and let the user know what ports we are bound to */
	for (i = 0; i < serial->num_ports; ++i) {
		tty_register_devfs (&serial_tty_driver, 0, serial->port[i].number);
		info("%s converter now attached to ttyUSB%d (or usb/tts/%d for devfs)", 
		     type->name, serial->port[i].number, serial->port[i].number);
	}

	return serial; /* success */


startup_error:
	spin_lock_irqsave(&post_lock, flags);
	if (serial->ref != 1) {
		err("bug in component startup: ref %d\n", serial->ref);
	}
	spin_unlock_irqrestore(&post_lock, flags);
probe_error:
	for (i = 0; i < num_bulk_in; ++i) {
		port = &serial->port[i];
		if (port->read_urb)
			usb_free_urb (port->read_urb);
		if (port->bulk_in_buffer)
			kfree (port->bulk_in_buffer);
	}
	for (i = 0; i < num_bulk_out; ++i) {
		port = &serial->port[i];
		if (port->write_urb)
			usb_free_urb (port->write_urb);
		if (port->bulk_out_buffer)
			kfree (port->bulk_out_buffer);
	}
	for (i = 0; i < num_interrupt_in; ++i) {
		port = &serial->port[i];
		if (port->interrupt_in_urb)
			usb_free_urb (port->interrupt_in_urb);
		if (port->interrupt_in_buffer)
			kfree (port->interrupt_in_buffer);
	}

	/* return the minor range that this device had */
	return_serial (serial);

	/* free up any memory that we allocated */
	kfree (serial);
	return NULL;
}

static void usb_serial_disconnect(struct usb_device *dev, void *ptr)
{
	struct usb_serial *serial = (struct usb_serial *) ptr;
	struct usb_serial_port *port;
	unsigned long flags;
	int i;

	dbg ("%s", __FUNCTION__);
	if (serial) {
		/* fail all future close/read/write/ioctl/etc calls */
		for (i = 0; i < serial->num_ports; ++i) {
			port = &serial->port[i];
			down (&port->sem);
			if (port->tty != NULL)
				while (port->open_count > 0)
					__serial_close(port, NULL);
			up (&port->sem);
		}

		serial->dev = NULL;
		serial_shutdown (serial);

		for (i = 0; i < serial->num_ports; ++i)
			serial->port[i].open_count = 0;

		for (i = 0; i < serial->num_bulk_in; ++i) {
			port = &serial->port[i];
			if (port->read_urb) {
				usb_unlink_urb (port->read_urb);
				usb_free_urb (port->read_urb);
			}
			if (port->bulk_in_buffer)
				kfree (port->bulk_in_buffer);
		}
		for (i = 0; i < serial->num_bulk_out; ++i) {
			port = &serial->port[i];
			if (port->write_urb) {
				usb_unlink_urb (port->write_urb);
				usb_free_urb (port->write_urb);
			}
			if (port->bulk_out_buffer)
				kfree (port->bulk_out_buffer);
		}
		for (i = 0; i < serial->num_interrupt_in; ++i) {
			port = &serial->port[i];
			if (port->interrupt_in_urb) {
				usb_unlink_urb (port->interrupt_in_urb);
				usb_free_urb (port->interrupt_in_urb);
			}
			if (port->interrupt_in_buffer)
				kfree (port->interrupt_in_buffer);
		}

		for (i = 0; i < serial->num_ports; ++i) {
			tty_unregister_devfs (&serial_tty_driver, serial->port[i].number);
			info("%s converter now disconnected from ttyUSB%d", serial->type->name, serial->port[i].number);
		}

		/* return the minor range that this device had */
		return_serial (serial);

		/* free up any memory that we allocated */
		spin_lock_irqsave(&post_lock, flags);
		if (--serial->ref == 0)
			kfree(serial);
		spin_unlock_irqrestore(&post_lock, flags);

	} else {
		info("device disconnected");
	}

}


static struct tty_driver serial_tty_driver = {
	.magic =		TTY_DRIVER_MAGIC,
	.driver_name =		"usb-serial",
#ifndef CONFIG_DEVFS_FS
	.name =			"ttyUSB",
#else
	.name =			"usb/tts/%d",
#endif
	.major =		SERIAL_TTY_MAJOR,
	.minor_start =		0,
	.num =			SERIAL_TTY_MINORS,
	.type =			TTY_DRIVER_TYPE_SERIAL,
	.subtype =		SERIAL_TYPE_NORMAL,
	.flags =		TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS,

	.refcount =		&serial_refcount,
	.table =		serial_tty,
	.termios =		serial_termios,
	.termios_locked =	serial_termios_locked,

	.open =			serial_open,
	.close =		serial_close,
	.write =		serial_write,
	.write_room =		serial_write_room,
	.ioctl =		serial_ioctl,
	.set_termios =		serial_set_termios,
	.throttle =		serial_throttle,
	.unthrottle =		serial_unthrottle,
	.break_ctl =		serial_break,
	.chars_in_buffer =	serial_chars_in_buffer,
	.read_proc =		serial_read_proc,
};


static int __init usb_serial_init(void)
{
	int i;
	int result;

	/* Initalize our global data */
	for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
		serial_table[i] = NULL;
	}
	post_task.routine = post_helper;

	/* register the tty driver */
	serial_tty_driver.init_termios          = tty_std_termios;
	serial_tty_driver.init_termios.c_cflag  = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
	if (tty_register_driver (&serial_tty_driver)) {
		err("%s - failed to register tty driver", __FUNCTION__);
		return -1;
	}

	/* register the USB driver */
	result = usb_register(&usb_serial_driver);
	if (result < 0) {
		tty_unregister_driver(&serial_tty_driver);
		err("usb_register failed for the usb-serial driver. Error number %d", result);
		return -1;
	}

#ifdef CONFIG_USB_SERIAL_GENERIC
	generic_device_ids[0].idVendor = vendor;
	generic_device_ids[0].idProduct = product;
	generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;
	/* register our generic driver with ourselves */
	usb_serial_register (&generic_device);
#endif

	info(DRIVER_DESC " " DRIVER_VERSION);

	return 0;
}


static void __exit usb_serial_exit(void)
{

#ifdef CONFIG_USB_SERIAL_GENERIC
	/* remove our generic driver */
	usb_serial_deregister (&generic_device);
#endif
	
	usb_deregister(&usb_serial_driver);
	tty_unregister_driver(&serial_tty_driver);
}


module_init(usb_serial_init);
module_exit(usb_serial_exit);


int usb_serial_register(struct usb_serial_device_type *new_device)
{
	/* Add this device to our list of devices */
	list_add(&new_device->driver_list, &usb_serial_driver_list);

	info ("USB Serial support registered for %s", new_device->name);

	usb_scan_devices();

	return 0;
}


void usb_serial_deregister(struct usb_serial_device_type *device)
{
	struct usb_serial *serial;
	int i;

	info("USB Serial deregistering driver %s", device->name);

	/* clear out the serial_table if the device is attached to a port */
	for(i = 0; i < SERIAL_TTY_MINORS; ++i) {
		serial = serial_table[i];
		if ((serial != NULL) && (serial->type == device)) {
			usb_driver_release_interface (&usb_serial_driver, serial->interface);
			usb_serial_disconnect (NULL, serial);
		}
	}

	list_del(&device->driver_list);
}



/* If the usb-serial core is built into the core, the usb-serial drivers
   need these symbols to load properly as modules. */
EXPORT_SYMBOL(usb_serial_register);
EXPORT_SYMBOL(usb_serial_deregister);
#ifdef USES_EZUSB_FUNCTIONS
	EXPORT_SYMBOL(ezusb_writememory);
	EXPORT_SYMBOL(ezusb_set_reset);
#endif


/* Module information */
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");

MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");

#ifdef CONFIG_USB_SERIAL_GENERIC
MODULE_PARM(vendor, "h");
MODULE_PARM_DESC(vendor, "User specified USB idVendor");

MODULE_PARM(product, "h");
MODULE_PARM_DESC(product, "User specified USB idProduct");
#endif