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usbcore: add usb_device_driver definition
This patch (as732) adds a usb_device_driver structure, for representing drivers that manage an entire USB device as opposed to just an interface. Support routines like usb_register_device_driver, usb_deregister_device_driver, usb_probe_device, and usb_unbind_device are also added. Unlike an earlier version of this patch, the new code is type-safe. To accomplish this, the existing struct driver embedded in struct usb_driver had to be wrapped in an intermediate wrapper. This enables the core to tell at runtime whether a particular struct driver belongs to a device driver or to an interface driver. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
Greg Kroah-Hartman
parent
36e56a3458
commit
8bb54ab573
@ -84,7 +84,7 @@ static int usb_create_newid_file(struct usb_driver *usb_drv)
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goto exit;
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if (usb_drv->probe != NULL)
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error = sysfs_create_file(&usb_drv->driver.kobj,
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error = sysfs_create_file(&usb_drv->drvwrap.driver.kobj,
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&driver_attr_new_id.attr);
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exit:
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return error;
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@ -96,7 +96,7 @@ static void usb_remove_newid_file(struct usb_driver *usb_drv)
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return;
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if (usb_drv->probe != NULL)
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sysfs_remove_file(&usb_drv->driver.kobj,
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sysfs_remove_file(&usb_drv->drvwrap.driver.kobj,
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&driver_attr_new_id.attr);
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}
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@ -143,18 +143,55 @@ static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *in
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}
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/* called from driver core with usb_bus_type.subsys writelock */
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/* called from driver core with dev locked */
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static int usb_probe_device(struct device *dev)
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{
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struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
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struct usb_device *udev;
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int error = -ENODEV;
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dev_dbg(dev, "%s\n", __FUNCTION__);
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if (!is_usb_device(dev)) /* Sanity check */
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return error;
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udev = to_usb_device(dev);
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/* FIXME: resume a suspended device */
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if (udev->state == USB_STATE_SUSPENDED)
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return -EHOSTUNREACH;
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/* TODO: Add real matching code */
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error = udriver->probe(udev);
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return error;
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}
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/* called from driver core with dev locked */
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static int usb_unbind_device(struct device *dev)
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{
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struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
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udriver->disconnect(to_usb_device(dev));
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return 0;
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}
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/* called from driver core with dev locked */
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static int usb_probe_interface(struct device *dev)
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{
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struct usb_interface * intf = to_usb_interface(dev);
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struct usb_driver *driver = to_usb_driver(dev->driver);
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struct usb_interface *intf;
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const struct usb_device_id *id;
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int error = -ENODEV;
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dev_dbg(dev, "%s\n", __FUNCTION__);
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if (!driver->probe)
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if (is_usb_device(dev)) /* Sanity check */
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return error;
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intf = to_usb_interface(dev);
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/* FIXME we'd much prefer to just resume it ... */
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if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED)
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return -EHOSTUNREACH;
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@ -182,18 +219,17 @@ static int usb_probe_interface(struct device *dev)
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return error;
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}
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/* called from driver core with usb_bus_type.subsys writelock */
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/* called from driver core with dev locked */
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static int usb_unbind_interface(struct device *dev)
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{
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struct usb_driver *driver = to_usb_driver(dev->driver);
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_driver *driver = to_usb_driver(intf->dev.driver);
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intf->condition = USB_INTERFACE_UNBINDING;
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/* release all urbs for this interface */
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usb_disable_interface(interface_to_usbdev(intf), intf);
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if (driver && driver->disconnect)
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driver->disconnect(intf);
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/* reset other interface state */
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@ -235,7 +271,7 @@ int usb_driver_claim_interface(struct usb_driver *driver,
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if (dev->driver)
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return -EBUSY;
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dev->driver = &driver->driver;
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dev->driver = &driver->drvwrap.driver;
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usb_set_intfdata(iface, priv);
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iface->condition = USB_INTERFACE_BOUND;
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mark_active(iface);
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@ -270,7 +306,7 @@ void usb_driver_release_interface(struct usb_driver *driver,
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struct device *dev = &iface->dev;
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/* this should never happen, don't release something that's not ours */
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if (!dev->driver || dev->driver != &driver->driver)
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if (!dev->driver || dev->driver != &driver->drvwrap.driver)
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return;
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/* don't release from within disconnect() */
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@ -433,12 +469,23 @@ EXPORT_SYMBOL_GPL_FUTURE(usb_match_id);
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int usb_device_match(struct device *dev, struct device_driver *drv)
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{
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/* devices and interfaces are handled separately */
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if (is_usb_device(dev)) {
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/* interface drivers never match devices */
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if (!is_usb_device_driver(drv))
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return 0;
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/* TODO: Add real matching code */
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return 1;
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} else {
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struct usb_interface *intf;
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struct usb_driver *usb_drv;
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const struct usb_device_id *id;
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/* check for generic driver, which we don't match any device with */
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if (drv == &usb_generic_driver)
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/* device drivers never match interfaces */
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if (is_usb_device_driver(drv))
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return 0;
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intf = to_usb_interface(dev);
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@ -451,6 +498,8 @@ int usb_device_match(struct device *dev, struct device_driver *drv)
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id = usb_match_dynamic_id(intf, usb_drv);
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if (id)
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return 1;
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}
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return 0;
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}
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@ -481,14 +530,13 @@ static int usb_uevent(struct device *dev, char **envp, int num_envp,
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/* driver is often null here; dev_dbg() would oops */
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pr_debug ("usb %s: uevent\n", dev->bus_id);
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/* Must check driver_data here, as on remove driver is always NULL */
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if ((dev->driver == &usb_generic_driver) ||
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(dev->driver_data == &usb_generic_driver_data))
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if (is_usb_device(dev))
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return 0;
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else {
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intf = to_usb_interface(dev);
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usb_dev = interface_to_usbdev(intf);
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alt = intf->cur_altsetting;
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}
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if (usb_dev->devnum < 0) {
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pr_debug ("usb %s: already deleted?\n", dev->bus_id);
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@ -569,13 +617,71 @@ static int usb_uevent(struct device *dev, char **envp,
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#endif /* CONFIG_HOTPLUG */
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/**
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* usb_register_driver - register a USB driver
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* @new_driver: USB operations for the driver
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* usb_register_device_driver - register a USB device (not interface) driver
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* @new_udriver: USB operations for the device driver
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* @owner: module owner of this driver.
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*
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* Registers a USB driver with the USB core. The list of unattached
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* interfaces will be rescanned whenever a new driver is added, allowing
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* the new driver to attach to any recognized devices.
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* Registers a USB device driver with the USB core. The list of
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* unattached devices will be rescanned whenever a new driver is
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* added, allowing the new driver to attach to any recognized devices.
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* Returns a negative error code on failure and 0 on success.
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*/
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int usb_register_device_driver(struct usb_device_driver *new_udriver,
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struct module *owner)
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{
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int retval = 0;
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if (usb_disabled())
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return -ENODEV;
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new_udriver->drvwrap.for_devices = 1;
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new_udriver->drvwrap.driver.name = (char *) new_udriver->name;
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new_udriver->drvwrap.driver.bus = &usb_bus_type;
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new_udriver->drvwrap.driver.probe = usb_probe_device;
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new_udriver->drvwrap.driver.remove = usb_unbind_device;
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new_udriver->drvwrap.driver.owner = owner;
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retval = driver_register(&new_udriver->drvwrap.driver);
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if (!retval) {
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pr_info("%s: registered new device driver %s\n",
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usbcore_name, new_udriver->name);
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usbfs_update_special();
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} else {
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printk(KERN_ERR "%s: error %d registering device "
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" driver %s\n",
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usbcore_name, retval, new_udriver->name);
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(usb_register_device_driver);
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/**
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* usb_deregister_device_driver - unregister a USB device (not interface) driver
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* @udriver: USB operations of the device driver to unregister
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* Context: must be able to sleep
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*
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* Unlinks the specified driver from the internal USB driver list.
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*/
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void usb_deregister_device_driver(struct usb_device_driver *udriver)
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{
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pr_info("%s: deregistering device driver %s\n",
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usbcore_name, udriver->name);
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driver_unregister(&udriver->drvwrap.driver);
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usbfs_update_special();
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}
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EXPORT_SYMBOL_GPL(usb_deregister_device_driver);
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/**
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* usb_register_driver - register a USB interface driver
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* @new_driver: USB operations for the interface driver
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* @owner: module owner of this driver.
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*
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* Registers a USB interface driver with the USB core. The list of
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* unattached interfaces will be rescanned whenever a new driver is
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* added, allowing the new driver to attach to any recognized interfaces.
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* Returns a negative error code on failure and 0 on success.
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*
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* NOTE: if you want your driver to use the USB major number, you must call
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@ -589,23 +695,25 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner)
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if (usb_disabled())
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return -ENODEV;
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new_driver->driver.name = (char *)new_driver->name;
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new_driver->driver.bus = &usb_bus_type;
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new_driver->driver.probe = usb_probe_interface;
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new_driver->driver.remove = usb_unbind_interface;
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new_driver->driver.owner = owner;
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new_driver->drvwrap.for_devices = 0;
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new_driver->drvwrap.driver.name = (char *) new_driver->name;
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new_driver->drvwrap.driver.bus = &usb_bus_type;
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new_driver->drvwrap.driver.probe = usb_probe_interface;
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new_driver->drvwrap.driver.remove = usb_unbind_interface;
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new_driver->drvwrap.driver.owner = owner;
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spin_lock_init(&new_driver->dynids.lock);
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INIT_LIST_HEAD(&new_driver->dynids.list);
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retval = driver_register(&new_driver->driver);
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retval = driver_register(&new_driver->drvwrap.driver);
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if (!retval) {
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pr_info("%s: registered new driver %s\n",
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pr_info("%s: registered new interface driver %s\n",
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usbcore_name, new_driver->name);
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usbfs_update_special();
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usb_create_newid_file(new_driver);
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} else {
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printk(KERN_ERR "%s: error %d registering driver %s\n",
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printk(KERN_ERR "%s: error %d registering interface "
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" driver %s\n",
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usbcore_name, retval, new_driver->name);
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}
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@ -614,8 +722,8 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner)
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EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver);
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/**
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* usb_deregister - unregister a USB driver
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* @driver: USB operations of the driver to unregister
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* usb_deregister - unregister a USB interface driver
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* @driver: USB operations of the interface driver to unregister
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* Context: must be able to sleep
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*
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* Unlinks the specified driver from the internal USB driver list.
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@ -626,11 +734,12 @@ EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver);
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*/
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void usb_deregister(struct usb_driver *driver)
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{
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pr_info("%s: deregistering driver %s\n", usbcore_name, driver->name);
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pr_info("%s: deregistering interface driver %s\n",
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usbcore_name, driver->name);
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usb_remove_newid_file(driver);
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usb_free_dynids(driver);
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driver_unregister(&driver->driver);
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driver_unregister(&driver->drvwrap.driver);
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usbfs_update_special();
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}
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@ -655,7 +764,7 @@ static int usb_generic_suspend(struct device *dev, pm_message_t message)
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* marked for FREEZE as soon as their children are already idled.
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* But those semantics are useless, so we equate the two (sigh).
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*/
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if (dev->driver == &usb_generic_driver) {
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if (is_usb_device(dev)) {
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if (dev->power.power_state.event == message.event)
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return 0;
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/* we need to rule out bogus requests through sysfs */
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@ -665,8 +774,7 @@ static int usb_generic_suspend(struct device *dev, pm_message_t message)
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return usb_port_suspend(to_usb_device(dev));
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}
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if ((dev->driver == NULL) ||
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(dev->driver_data == &usb_generic_driver_data))
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if (dev->driver == NULL)
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return 0;
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intf = to_usb_interface(dev);
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@ -705,15 +813,14 @@ static int usb_generic_resume(struct device *dev)
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dev->power.power_state.event = PM_EVENT_ON;
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/* devices resume through their hubs */
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if (dev->driver == &usb_generic_driver) {
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if (is_usb_device(dev)) {
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udev = to_usb_device(dev);
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if (udev->state == USB_STATE_NOTATTACHED)
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return 0;
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return usb_port_resume(udev);
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}
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if ((dev->driver == NULL) ||
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(dev->driver_data == &usb_generic_driver_data)) {
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if (dev->driver == NULL) {
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dev->power.power_state.event = PM_EVENT_FREEZE;
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return 0;
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}
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@ -21,14 +21,12 @@
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#include <linux/usb.h>
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#include "usb.h"
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static int generic_probe(struct device *dev)
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static int generic_probe(struct usb_device *udev)
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{
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return 0;
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}
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static int generic_remove(struct device *dev)
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static void generic_disconnect(struct usb_device *udev)
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{
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struct usb_device *udev = to_usb_device(dev);
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/* if this is only an unbind, not a physical disconnect, then
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* unconfigure the device */
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if (udev->state == USB_STATE_CONFIGURED)
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@ -37,17 +35,10 @@ static int generic_remove(struct device *dev)
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/* in case the call failed or the device was suspended */
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if (udev->state >= USB_STATE_CONFIGURED)
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usb_disable_device(udev, 0);
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return 0;
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}
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struct device_driver usb_generic_driver = {
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.owner = THIS_MODULE,
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struct usb_device_driver usb_generic_driver = {
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.name = "usb",
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.bus = &usb_bus_type,
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.probe = generic_probe,
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.remove = generic_remove,
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.disconnect = generic_disconnect,
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};
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/* Fun hack to determine if the struct device is a
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* usb device or a usb interface. */
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int usb_generic_driver_data;
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@ -123,7 +123,7 @@ static int __find_interface(struct device * dev, void * data)
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struct usb_interface *intf;
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/* can't look at usb devices, only interfaces */
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if (dev->driver == &usb_generic_driver)
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if (is_usb_device(dev))
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return 0;
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intf = to_usb_interface(dev);
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@ -149,7 +149,8 @@ struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor)
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argb.minor = minor;
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argb.interface = NULL;
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driver_for_each_device(&drv->driver, NULL, &argb, __find_interface);
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driver_for_each_device(&drv->drvwrap.driver, NULL, &argb,
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__find_interface);
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return argb.interface;
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}
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@ -204,11 +205,13 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1)
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device_initialize(&dev->dev);
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dev->dev.bus = &usb_bus_type;
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dev->dev.dma_mask = bus->controller->dma_mask;
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dev->dev.driver_data = &usb_generic_driver_data;
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dev->dev.driver = &usb_generic_driver;
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dev->dev.driver = &usb_generic_driver.drvwrap.driver;
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dev->dev.release = usb_release_dev;
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dev->state = USB_STATE_ATTACHED;
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/* This magic assignment distinguishes devices from interfaces */
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dev->dev.platform_data = &usb_generic_driver;
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INIT_LIST_HEAD(&dev->ep0.urb_list);
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dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
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dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
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@ -838,7 +841,7 @@ static int __init usb_init(void)
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retval = usb_hub_init();
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if (retval)
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goto hub_init_failed;
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retval = driver_register(&usb_generic_driver);
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retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE);
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if (!retval)
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goto out;
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@ -868,7 +871,7 @@ static void __exit usb_exit(void)
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if (nousb)
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return;
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driver_unregister(&usb_generic_driver);
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usb_deregister_device_driver(&usb_generic_driver);
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usb_major_cleanup();
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usbfs_cleanup();
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usb_deregister(&usbfs_driver);
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@ -34,8 +34,24 @@ extern int usb_port_suspend(struct usb_device *dev);
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extern int usb_port_resume(struct usb_device *dev);
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extern struct bus_type usb_bus_type;
|
||||
extern struct device_driver usb_generic_driver;
|
||||
extern int usb_generic_driver_data;
|
||||
extern struct usb_device_driver usb_generic_driver;
|
||||
|
||||
/* Here's how we tell apart devices and interfaces. Luckily there's
|
||||
* no such thing as a platform USB device, so we can steal the use
|
||||
* of the platform_data field. */
|
||||
|
||||
static inline int is_usb_device(struct device *dev)
|
||||
{
|
||||
return dev->platform_data == &usb_generic_driver;
|
||||
}
|
||||
|
||||
/* Do the same for device drivers and interface drivers. */
|
||||
|
||||
static inline int is_usb_device_driver(struct device_driver *drv)
|
||||
{
|
||||
return container_of(drv, struct usbdrv_wrap, driver)->
|
||||
for_devices;
|
||||
}
|
||||
|
||||
/* Interfaces and their "power state" are owned by usbcore */
|
||||
|
||||
|
||||
@ -540,7 +540,17 @@ struct usb_dynids {
|
||||
};
|
||||
|
||||
/**
|
||||
* struct usb_driver - identifies USB driver to usbcore
|
||||
* struct usbdrv_wrap - wrapper for driver-model structure
|
||||
* @driver: The driver-model core driver structure.
|
||||
* @for_devices: Non-zero for device drivers, 0 for interface drivers.
|
||||
*/
|
||||
struct usbdrv_wrap {
|
||||
struct device_driver driver;
|
||||
int for_devices;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct usb_driver - identifies USB interface driver to usbcore
|
||||
* @name: The driver name should be unique among USB drivers,
|
||||
* and should normally be the same as the module name.
|
||||
* @probe: Called to see if the driver is willing to manage a particular
|
||||
@ -567,12 +577,12 @@ struct usb_dynids {
|
||||
* or your driver's probe function will never get called.
|
||||
* @dynids: used internally to hold the list of dynamically added device
|
||||
* ids for this driver.
|
||||
* @driver: the driver model core driver structure.
|
||||
* @drvwrap: Driver-model core structure wrapper.
|
||||
* @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be
|
||||
* added to this driver by preventing the sysfs file from being created.
|
||||
*
|
||||
* USB drivers must provide a name, probe() and disconnect() methods,
|
||||
* and an id_table. Other driver fields are optional.
|
||||
* USB interface drivers must provide a name, probe() and disconnect()
|
||||
* methods, and an id_table. Other driver fields are optional.
|
||||
*
|
||||
* The id_table is used in hotplugging. It holds a set of descriptors,
|
||||
* and specialized data may be associated with each entry. That table
|
||||
@ -606,10 +616,40 @@ struct usb_driver {
|
||||
const struct usb_device_id *id_table;
|
||||
|
||||
struct usb_dynids dynids;
|
||||
struct device_driver driver;
|
||||
struct usbdrv_wrap drvwrap;
|
||||
unsigned int no_dynamic_id:1;
|
||||
};
|
||||
#define to_usb_driver(d) container_of(d, struct usb_driver, driver)
|
||||
#define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver)
|
||||
|
||||
/**
|
||||
* struct usb_device_driver - identifies USB device driver to usbcore
|
||||
* @name: The driver name should be unique among USB drivers,
|
||||
* and should normally be the same as the module name.
|
||||
* @probe: Called to see if the driver is willing to manage a particular
|
||||
* device. If it is, probe returns zero and uses dev_set_drvdata()
|
||||
* to associate driver-specific data with the device. If unwilling
|
||||
* to manage the device, return a negative errno value.
|
||||
* @disconnect: Called when the device is no longer accessible, usually
|
||||
* because it has been (or is being) disconnected or the driver's
|
||||
* module is being unloaded.
|
||||
* @suspend: Called when the device is going to be suspended by the system.
|
||||
* @resume: Called when the device is being resumed by the system.
|
||||
* @drvwrap: Driver-model core structure wrapper.
|
||||
*
|
||||
* USB drivers must provide all the fields listed above except drvwrap.
|
||||
*/
|
||||
struct usb_device_driver {
|
||||
const char *name;
|
||||
|
||||
int (*probe) (struct usb_device *udev);
|
||||
void (*disconnect) (struct usb_device *udev);
|
||||
|
||||
int (*suspend) (struct usb_device *udev, pm_message_t message);
|
||||
int (*resume) (struct usb_device *udev);
|
||||
struct usbdrv_wrap drvwrap;
|
||||
};
|
||||
#define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \
|
||||
drvwrap.driver)
|
||||
|
||||
extern struct bus_type usb_bus_type;
|
||||
|
||||
@ -633,13 +673,17 @@ struct usb_class_driver {
|
||||
* use these in module_init()/module_exit()
|
||||
* and don't forget MODULE_DEVICE_TABLE(usb, ...)
|
||||
*/
|
||||
int usb_register_driver(struct usb_driver *, struct module *);
|
||||
extern int usb_register_driver(struct usb_driver *, struct module *);
|
||||
static inline int usb_register(struct usb_driver *driver)
|
||||
{
|
||||
return usb_register_driver(driver, THIS_MODULE);
|
||||
}
|
||||
extern void usb_deregister(struct usb_driver *);
|
||||
|
||||
extern int usb_register_device_driver(struct usb_device_driver *,
|
||||
struct module *);
|
||||
extern void usb_deregister_device_driver(struct usb_device_driver *);
|
||||
|
||||
extern int usb_register_dev(struct usb_interface *intf,
|
||||
struct usb_class_driver *class_driver);
|
||||
extern void usb_deregister_dev(struct usb_interface *intf,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user