Initial file dump from open source releaseHEADmaster

1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
new file mode 100644
index 00000000..7229b265
--- /dev/null
+++ b/drivers/usb/serial/bus.c
@@ -0,0 +1,196 @@
+/*
+ * USB Serial Converter Bus specific functions
+ *
+ * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License version
+ *	2 as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+static int usb_serial_device_match(struct device *dev,
+						struct device_driver *drv)
+{
+	struct usb_serial_driver *driver;
+	const struct usb_serial_port *port;
+
+	/*
+	 * drivers are already assigned to ports in serial_probe so it's
+	 * a simple check here.
+	 */
+	port = to_usb_serial_port(dev);
+	if (!port)
+		return 0;
+
+	driver = to_usb_serial_driver(drv);
+
+	if (driver == port->serial->type)
+		return 1;
+
+	return 0;
+}
+
+static ssize_t show_port_number(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct usb_serial_port *port = to_usb_serial_port(dev);
+
+	return sprintf(buf, "%d\n", port->number - port->serial->minor);
+}
+
+static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL);
+
+static int usb_serial_device_probe(struct device *dev)
+{
+	struct usb_serial_driver *driver;
+	struct usb_serial_port *port;
+	int retval = 0;
+	int minor;
+
+	port = to_usb_serial_port(dev);
+	if (!port) {
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* make sure suspend/resume doesn't race against port_probe */
+	retval = usb_autopm_get_interface(port->serial->interface);
+	if (retval)
+		goto exit;
+
+	driver = port->serial->type;
+	if (driver->port_probe) {
+		retval = driver->port_probe(port);
+		if (retval)
+			goto exit_with_autopm;
+	}
+
+	retval = device_create_file(dev, &dev_attr_port_number);
+	if (retval) {
+		if (driver->port_remove)
+			retval = driver->port_remove(port);
+		goto exit_with_autopm;
+	}
+
+	minor = port->number;
+	tty_register_device(usb_serial_tty_driver, minor, dev);
+	dev_info(&port->serial->dev->dev,
+		 "%s converter now attached to ttyUSB%d\n",
+		 driver->description, minor);
+
+exit_with_autopm:
+	usb_autopm_put_interface(port->serial->interface);
+exit:
+	return retval;
+}
+
+static int usb_serial_device_remove(struct device *dev)
+{
+	struct usb_serial_driver *driver;
+	struct usb_serial_port *port;
+	int retval = 0;
+	int minor;
+	int autopm_err;
+
+	port = to_usb_serial_port(dev);
+	if (!port)
+		return -ENODEV;
+
+	/*
+	 * Make sure suspend/resume doesn't race against port_remove.
+	 *
+	 * Note that no further runtime PM callbacks will be made if
+	 * autopm_get fails.
+	 */
+	autopm_err = usb_autopm_get_interface(port->serial->interface);
+
+	minor = port->number;
+	tty_unregister_device(usb_serial_tty_driver, minor);
+
+	device_remove_file(&port->dev, &dev_attr_port_number);
+
+	driver = port->serial->type;
+	if (driver->port_remove)
+		retval = driver->port_remove(port);
+
+	dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
+		 driver->description, minor);
+
+	if (!autopm_err)
+		usb_autopm_put_interface(port->serial->interface);
+
+	return retval;
+}
+
+static ssize_t store_new_id(struct device_driver *driver,
+			    const char *buf, size_t count)
+{
+	struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
+	ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count);
+
+	if (retval >= 0 && usb_drv->usb_driver != NULL)
+		retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
+					  &usb_drv->usb_driver->drvwrap.driver,
+					  buf, count);
+	return retval;
+}
+
+static ssize_t show_dynids(struct device_driver *driver, char *buf)
+{
+	struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
+
+	return usb_show_dynids(&usb_drv->dynids, buf);
+}
+
+static struct driver_attribute drv_attrs[] = {
+	__ATTR(new_id, S_IRUGO | S_IWUSR, show_dynids, store_new_id),
+	__ATTR_NULL,
+};
+
+static void free_dynids(struct usb_serial_driver *drv)
+{
+	struct usb_dynid *dynid, *n;
+
+	spin_lock(&drv->dynids.lock);
+	list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
+		list_del(&dynid->node);
+		kfree(dynid);
+	}
+	spin_unlock(&drv->dynids.lock);
+}
+
+struct bus_type usb_serial_bus_type = {
+	.name =		"usb-serial",
+	.match =	usb_serial_device_match,
+	.probe =	usb_serial_device_probe,
+	.remove =	usb_serial_device_remove,
+	.drv_attrs = 	drv_attrs,
+};
+
+int usb_serial_bus_register(struct usb_serial_driver *driver)
+{
+	int retval;
+
+	driver->driver.bus = &usb_serial_bus_type;
+	spin_lock_init(&driver->dynids.lock);
+	INIT_LIST_HEAD(&driver->dynids.list);
+
+	retval = driver_register(&driver->driver);
+
+	return retval;
+}
+
+void usb_serial_bus_deregister(struct usb_serial_driver *driver)
+{
+	free_dynids(driver);
+	driver_unregister(&driver->driver);
+}
+