usb_free_coherent – free memory allocated with usb_alloc_coherent Synopsis void usb_free_coherent(struct usb_device *dev, size_t size, void *addr, dma_addr_t dma); Arguments dev device the buffer was used with size requested buffer size addr CPU address of buffer dma DMA address of buffer Description This reclaims an I/O buffer, letting it be reused. The memory must have been…
usb_for_each_dev – iterate over all USB devices in the system Synopsis int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)); Arguments data data pointer that will be handed to the callback function fn callback function to be called for each USB device Description Iterate over all USB devices and call fn for each, passing it…
usb_find_interface – find usb_interface pointer for driver and device Synopsis struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor); Arguments drv the driver whose current configuration is considered minor the minor number of the desired device Description This walks the bus device list and returns a pointer to the interface with the matching minor and driver. Note,…
usb_find_alt_setting – Given a configuration, find the alternate setting for the given interface. Synopsis struct usb_host_interface *usb_find_alt_setting(struct usb_host_config *config, unsigned int iface_num, unsigned int alt_num); Arguments config the configuration to search (not necessarily the current config). iface_num interface number to search in alt_num alternate interface setting number to search for. Description Search the configuration’s interface…
usb_fill_int_urb – macro to help initialize a interrupt urb Synopsis void usb_fill_int_urb(struct urb *urb, struct usb_device *dev, unsigned int pipe, void *transfer_buffer, int buffer_length, usb_complete_t complete_fn, void *context, int interval); Arguments urb pointer to the urb to initialize. dev pointer to the struct usb_device for this urb. pipe the endpoint pipe transfer_buffer pointer to the…
usb_fill_control_urb – initializes a control urb Synopsis void usb_fill_control_urb(struct urb *urb, struct usb_device *dev, unsigned int pipe, unsigned char *setup_packet, void *transfer_buffer, int buffer_length, usb_complete_t complete_fn, void *context); Arguments urb pointer to the urb to initialize. dev pointer to the struct usb_device for this urb. pipe the endpoint pipe setup_packet pointer to the setup_packet buffer…
usb_fill_bulk_urb – macro to help initialize a bulk urb Synopsis void usb_fill_bulk_urb(struct urb *urb, struct usb_device *dev, unsigned int pipe, void *transfer_buffer, int buffer_length, usb_complete_t complete_fn, void *context); Arguments urb pointer to the urb to initialize. dev pointer to the struct usb_device for this urb. pipe the endpoint pipe transfer_buffer pointer to the transfer buffer…
usb_ep_align_maybe – returns len aligned to ep’s maxpacketsize if gadget requires quirk_ep_out_aligned_size, otherwise returns len. Synopsis size_t usb_ep_align_maybe(struct usb_gadget *g, struct usb_ep *ep, size_t len); Arguments g controller to check for quirk ep the endpoint whose maxpacketsize is used to align len len buffer size’s length to align to ep‘s maxpacketsize Description This helper is…
usb_ep_align – returns len aligned to ep’s maxpacketsize. Synopsis size_t usb_ep_align(struct usb_ep *ep, size_t len); Arguments ep the endpoint whose maxpacketsize is used to align len len buffer size’s length to align to ep‘s maxpacketsize Description This helper is used to align buffer’s size to an ep’s maxpacketsize. Author David Brownell <dbrownell [at] users.sourceforge.net> Author….
usb_enable_autosuspend – allow a USB device to be autosuspended Synopsis void usb_enable_autosuspend(struct usb_device *udev); Arguments udev the USB device which may be autosuspended Description This routine allows udev to be autosuspended. An autosuspend won’t take place until the autosuspend_delay has elapsed and all the other necessary conditions are satisfied. The caller must hold udev‘s device…
usb_driver_set_configuration – Provide a way for drivers to change device configurations Synopsis int usb_driver_set_configuration(struct usb_device *udev, int config); Arguments udev the device whose configuration is being updated config the configuration being chosen. Context In process context, must be able to sleep Description Device interface drivers are not allowed to change device configurations. This is because…
usb_driver_release_interface – unbind a driver from an interface Synopsis void usb_driver_release_interface(struct usb_driver *driver, struct usb_interface *iface); Arguments driver the driver to be unbound iface the interface from which it will be unbound Description This can be used by drivers to release an interface without waiting for their disconnect methods to be called. In typical cases…
usb_driver_claim_interface – bind a driver to an interface Synopsis int usb_driver_claim_interface(struct usb_driver *driver, struct usb_interface *iface, void *priv); Arguments driver the driver to be bound iface the interface to which it will be bound; must be in the usb device’s active configuration priv driver data associated with that interface Description This is used by usb…
usb_disable_autosuspend – prevent a USB device from being autosuspended Synopsis void usb_disable_autosuspend(struct usb_device *udev); Arguments udev the USB device which may not be autosuspended Description This routine prevents udev from being autosuspended and wakes it up if it is already autosuspended. The caller must hold udev‘s device lock. Copyright
usb_descriptor_fillbuf – fill buffer with descriptors Synopsis int usb_descriptor_fillbuf(void *buf, unsigned buflen, const struct usb_descriptor_header **src); Arguments buf Buffer to be filled buflen Size of buf src Array of descriptor pointers, terminated by null pointer. Description Copies descriptors into the buffer, returning the length or a negative error code if they can’t all be copied….
usb_deregister_device_driver – unregister a USB device (not interface) driver Synopsis void usb_deregister_device_driver(struct usb_device_driver *udriver); Arguments udriver USB operations of the device driver to unregister Context must be able to sleep Description Unlinks the specified driver from the internal USB driver list. Copyright
usb_deregister_dev – deregister a USB device’s dynamic minor. Synopsis void usb_deregister_dev(struct usb_interface *intf, struct usb_class_driver *class_driver); Arguments intf pointer to the usb_interface that is being deregistered class_driver pointer to the usb_class_driver for this device Description Used in conjunction with usb_register_dev. This function is called when the USB driver is finished with the minor numbers gotten…
usb_deregister – unregister a USB interface driver Synopsis void usb_deregister(struct usb_driver *driver); Arguments driver USB operations of the interface driver to unregister Context must be able to sleep Description Unlinks the specified driver from the internal USB driver list. Note If you called usb_register_dev, you still need to call usb_deregister_dev to clean up your driver’s…
usb_create_shared_hcd – create and initialize an HCD structure Synopsis struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver, struct device *dev, const char *bus_name, struct usb_hcd *primary_hcd); Arguments driver HC driver that will use this hcd dev device for this HC, stored in hcd->self.controller bus_name value to store in hcd->self.bus_name primary_hcd a pointer to the usb_hcd structure that…
usb_create_hcd – create and initialize an HCD structure Synopsis struct usb_hcd *usb_create_hcd(const struct hc_driver *driver, struct device *dev, const char *bus_name); Arguments driver HC driver that will use this hcd dev device for this HC, stored in hcd->self.controller bus_name value to store in hcd->self.bus_name Context !in_interrupt Description Allocate a struct usb_hcd, with extra space at…