usb_gadget_config_buf – builts a complete configuration descriptor Synopsis int usb_gadget_config_buf(const struct usb_config_descriptor *config, void *buf, unsigned length, const struct usb_descriptor_header **desc); Arguments config Header for the descriptor, including characteristics such as power requirements and number of interfaces. buf Buffer for the resulting configuration descriptor. length Length of buffer. If this is not big enough to…
usb_function_deactivate – prevent function and gadget enumeration Synopsis int usb_function_deactivate(struct usb_function *function); Arguments function the function that isn’t yet ready to respond Description Blocks response of the gadget driver to host enumeration by preventing the data line pullup from being activated. This is normally called during bind() processing to change from the initial “ready to…
usb_function_activate – allow function and gadget enumeration Synopsis int usb_function_activate(struct usb_function *function); Arguments function function on which usb_function_activate was called Description Reverses effect of usb_function_deactivate. If no more functions are delaying their activation, the gadget driver will respond to host enumeration procedures. Returns zero on success, else negative errno. Author David Brownell <dbrownell [at] users.sourceforge.net>…
usb_free_urb – frees the memory used by a urb when all users of it are finished Synopsis void usb_free_urb(struct urb *urb); Arguments urb pointer to the urb to free, may be NULL Description Must be called when a user of a urb is finished with it. When the last user of the urb calls this…
usb_free_streams – free bulk endpoint stream IDs. Synopsis int usb_free_streams(struct usb_interface *interface, struct usb_host_endpoint **eps, unsigned int num_eps, gfp_t mem_flags); Arguments interface alternate setting that includes all endpoints. eps array of endpoints to remove streams from. num_eps number of endpoints in the array. mem_flags flags hcd should use to allocate memory. Description Reverts a group…
usb_free_descriptors – free descriptors returned by usb_copy_descriptors Synopsis void usb_free_descriptors(struct usb_descriptor_header **v); Arguments v vector of descriptors Author David Brownell <dbrownell [at] users.sourceforge.net> Author. Copyright
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