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STRUCT USB_DRIVER(9) | Host-Side Data Types and Macro | STRUCT USB_DRIVER(9) |
NAME¶
struct_usb_driver - identifies USB interface driver to usbcoreSYNOPSIS¶
struct usb_driver { const char * name; int (* probe) (struct usb_interface *intf,const struct usb_device_id *id); void (* disconnect) (struct usb_interface *intf); int (* unlocked_ioctl) (struct usb_interface *intf, unsigned int code,void *buf); int (* suspend) (struct usb_interface *intf, pm_message_t message); int (* resume) (struct usb_interface *intf); int (* reset_resume) (struct usb_interface *intf); int (* pre_reset) (struct usb_interface *intf); int (* post_reset) (struct usb_interface *intf); const struct usb_device_id * id_table; struct usb_dynids dynids; struct usbdrv_wrap drvwrap; unsigned int no_dynamic_id:1; unsigned int supports_autosuspend:1; unsigned int soft_unbind:1; };
MEMBERS¶
nameThe 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 interface on a device. If it is, probe returns zero and
uses usb_set_intfdata to associate driver-specific data with the
interface. It may also use usb_set_interface to specify the appropriate
altsetting. If unwilling to manage the interface, return -ENODEV, if genuine
IO errors occurred, an appropriate negative errno value.
disconnect
Called when the interface is no longer
accessible, usually because its device has been (or is being) disconnected or
the driver module is being unloaded.
unlocked_ioctl
Used for drivers that want to talk to
userspace through the “usbfs” filesystem. This lets devices
provide ways to expose information to user space regardless of where they do
(or don't) show up otherwise in the filesystem.
suspend
Called when the device is going to be
suspended by the system.
resume
Called when the device is being resumed by the
system.
reset_resume
Called when the suspended device has been
reset instead of being resumed.
pre_reset
Called by usb_reset_device when the
device is about to be reset. This routine must not return until the driver has
no active URBs for the device, and no more URBs may be submitted until the
post_reset method is called.
post_reset
Called by usb_reset_device after the
device has been reset
id_table
USB drivers use ID table to support
hotplugging. Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
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.
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.
supports_autosuspend
if set to 0, the USB core will not allow
autosuspend for interfaces bound to this driver.
soft_unbind
if set to 1, the USB core will not kill URBs
and disable endpoints before calling the driver's disconnect method.
DESCRIPTION¶
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 is used by both user and kernel mode hotplugging support. The probe and disconnect methods are called in a context where they can sleep, but they should avoid abusing the privilege. Most work to connect to a device should be done when the device is opened, and undone at the last close. The disconnect code needs to address concurrency issues with respect to open and close methods, as well as forcing all pending I/O requests to complete (by unlinking them as necessary, and blocking until the unlinks complete).COPYRIGHT¶
March 2016 | Kernel Hackers Manual 3.2. |