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usbcore: add usb_device_driver definition

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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 2006-07-01 22:08:49 -04:00 • committed by Greg Kroah-Hartman
parent 36e56a3458
commit 8bb54ab573
5 changed files with 245 additions and 84 deletions
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58
include/linux/usb.h
View file

@ -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,