usb_string_ids_tab – allocate unused string IDs in batch Synopsis int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str); Arguments cdev the device whose string descriptor IDs are being allocated str an array of usb_string objects to assign numbers to Context single threaded during gadget setup Description usb_string_ids() is called from bind callbacks to allocate string IDs. Drivers…
usb_string_ids_n – allocate unused string IDs in batch Synopsis int usb_string_ids_n(struct usb_composite_dev *c, unsigned n); Arguments c the device whose string descriptor IDs are being allocated n number of string IDs to allocate Context single threaded during gadget setup Description Returns the first requested ID. This ID and next n-1 IDs are now valid IDs….
usb_string_id – allocate an unused string ID Synopsis int usb_string_id(struct usb_composite_dev *cdev); Arguments cdev the device whose string descriptor IDs are being allocated Context single threaded during gadget setup Description usb_string_id() is called from bind callbacks to allocate string IDs. Drivers for functions, configurations, or gadgets will then store that ID in the appropriate descriptors…
usb_string – returns UTF-8 version of a string descriptor Synopsis int usb_string(struct usb_device *dev, int index, char *buf, size_t size); Arguments dev the device whose string descriptor is being retrieved index the number of the descriptor buf where to put the string size how big is “buf”? Context !in_interrupt () Description This converts the UTF-16LE…
usb_state_string – Returns human readable name for the state. Synopsis const char *usb_state_string(enum usb_device_state state); Arguments state The state to return a human-readable name for. If it’s not any of the states devices in usb_device_state_string enum, the string UNKNOWN will be returned. Copyright
usb_speed_string – Returns human readable-name of the speed. Synopsis const char *usb_speed_string(enum usb_device_speed speed); Arguments speed The speed to return human-readable name for. If it’s not any of the speeds defined in usb_device_speed enum, string for USB_SPEED_UNKNOWN will be returned. Copyright
usb_sg_wait – synchronously execute scatter/gather request Synopsis void usb_sg_wait(struct usb_sg_request *io); Arguments io request block handle, as initialized with usb_sg_init. some fields become accessible when this call returns. Context !in_interrupt () Description This function blocks until the specified I/O operation completes. It leverages the grouping of the related I/O requests to get good transfer rates,…
usb_sg_init – initializes scatterlist-based bulk/interrupt I/O request Synopsis int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev, unsigned pipe, unsigned period, struct scatterlist *sg, int nents, size_t length, gfp_t mem_flags); Arguments io request block being initialized. until usb_sg_wait returns, treat this as a pointer to an opaque block of memory, dev the usb device that will send…
usb_sg_cancel – stop scatter/gather i/o issued by usb_sg_wait Synopsis void usb_sg_cancel(struct usb_sg_request *io); Arguments io request block, initialized with usb_sg_init Description This stops a request after it has been started by usb_sg_wait. It can also prevents one initialized by usb_sg_init from starting, so that call just frees resources allocated to the request. Copyright
usb_set_interface – Makes a particular alternate setting be current Synopsis int usb_set_interface(struct usb_device *dev, int interface, int alternate); Arguments dev the device whose interface is being updated interface the interface being updated alternate the setting being chosen. Context !in_interrupt () Description This is used to enable data transfers on interfaces that may not be enabled…
usb_set_device_state – change a device’s current state (usbcore, hcds) Synopsis void usb_set_device_state(struct usb_device *udev, enum usb_device_state new_state); Arguments udev pointer to device whose state should be changed new_state new state value to be stored Description udev->state is _not_ fully protected by the device lock. Although most transitions are made only while holding the lock, the…
usb_scuttle_anchored_urbs – unanchor all an anchor’s urbs Synopsis void usb_scuttle_anchored_urbs(struct usb_anchor *anchor); Arguments anchor the anchor whose urbs you want to unanchor Description use this to get rid of all an anchor’s urbs Copyright
usb_root_hub_lost_power – called by HCD if the root hub lost Vbus power Synopsis void usb_root_hub_lost_power(struct usb_device *rhdev); Arguments rhdev struct usb_device for the root hub Description The USB host controller driver calls this function when its root hub is resumed and Vbus power has been interrupted or the controller has been reset. The routine marks…
usb_reset_endpoint – Reset an endpoint’s state. Synopsis void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr); Arguments dev the device whose endpoint is to be reset epaddr the endpoint’s address. Endpoint number for output, endpoint number + USB_DIR_IN for input Description Resets any host-side endpoint state such as the toggle bit, sequence number or current window. Copyright
usb_reset_device – warn interface drivers and perform a USB port reset Synopsis int usb_reset_device(struct usb_device *udev); Arguments udev device to reset (not in SUSPENDED or NOTATTACHED state) Description Warns all drivers bound to registered interfaces (using their pre_reset method), performs the port reset, and then lets the drivers know that the reset is over (using…
usb_reset_configuration – lightweight device reset Synopsis int usb_reset_configuration(struct usb_device *dev); Arguments dev the device whose configuration is being reset Description This issues a standard SET_CONFIGURATION request to the device using the current configuration. The effect is to reset most USB-related state in the device, including interface altsettings (reset to zero), endpoint halts (cleared), and endpoint…
usb_remove_hcd – shutdown processing for generic HCDs Synopsis void usb_remove_hcd(struct usb_hcd *hcd); Arguments hcd the usb_hcd structure to remove Context !in_interrupt Description Disconnects the root hub, then reverses the effects of usb_add_hcd, invoking the HCD’s stop method. Copyright
usb_register_driver – register a USB interface driver Synopsis int usb_register_driver(struct usb_driver *new_driver, struct module *owner, const char *mod_name); Arguments new_driver USB operations for the interface driver owner module owner of this driver. mod_name module name string Description Registers a USB interface driver with the USB core. The list of unattached interfaces will be rescanned whenever…
usb_register_device_driver – register a USB device (not interface) driver Synopsis int usb_register_device_driver(struct usb_device_driver *new_udriver, struct module *owner); Arguments new_udriver USB operations for the device driver owner module owner of this driver. Description Registers a USB device driver with the USB core. The list of unattached devices will be rescanned whenever a new driver is added,…
usb_register_dev – register a USB device, and ask for a minor number Synopsis int usb_register_dev(struct usb_interface *intf, struct usb_class_driver *class_driver); Arguments intf pointer to the usb_interface that is being registered class_driver pointer to the usb_class_driver for this device Description This should be called by all USB drivers that use the USB major number. If CONFIG_USB_DYNAMIC_MINORS…