USB_AUTOPM_PUT_INTER(9) USB Core APIs USB_AUTOPM_PUT_INTER(9)NAME
usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
SYNOPSIS
void usb_autopm_put_interface_async(struct usb_interface * intf);
ARGUMENTS
intf
the usb_interface whose counter should be decremented
DESCRIPTION
This routine does much the same thing as usb_autopm_put_interface: It decrements intf's usage counter and schedules a delayed autosuspend
request if the counter is <= 0. The difference is that it does not perform any synchronization; callers should hold a private lock and
handle all synchronization issues themselves.
Typically a driver would call this routine during an URB's completion handler, if no more URBs were pending.
This routine can run in atomic context.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_AUTOPM_PUT_INTER(9)
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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 usbcore
SYNOPSIS
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 (* 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
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 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 occured, 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.
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.
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 Kernel Hackers Manual 2.6. July 2010 STRUCT USB_DRIVER(9)