302 lines
10 KiB
C
302 lines
10 KiB
C
/*
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* LPCUSB, an USB device driver for LPC microcontrollers
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* Copyright (C) 2006 Bertrik Sikken (bertrik@sikken.nl)
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* Copyright (c) 2016 Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* @brief USB device core layer APIs and structures
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*
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* This file contains the USB device core layer APIs and structures.
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*/
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#ifndef USB_DEVICE_H_
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#define USB_DEVICE_H_
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#include <drivers/usb/usb_dc.h>
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#include <usb/usbstruct.h>
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/*************************************************************************
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* USB configuration
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**************************************************************************/
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#define MAX_PACKET_SIZE0 64 /**< maximum packet size for EP 0 */
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/*************************************************************************
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* USB application interface
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**************************************************************************/
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/** setup packet definitions */
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struct usb_setup_packet {
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u8_t bmRequestType; /**< characteristics of the specific request */
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u8_t bRequest; /**< specific request */
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u16_t wValue; /**< request specific parameter */
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u16_t wIndex; /**< request specific parameter */
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u16_t wLength; /**< length of data transferred in data phase */
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};
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/**
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* Callback function signature for the device
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*/
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typedef void (*usb_status_callback)(enum usb_dc_status_code status_code,
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u8_t *param);
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/**
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* Callback function signature for the USB Endpoint status
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*/
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typedef void (*usb_ep_callback)(u8_t ep,
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enum usb_dc_ep_cb_status_code cb_status);
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/**
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* Function which handles Class specific requests corresponding to an
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* interface number specified in the device descriptor table
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*/
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typedef int (*usb_request_handler) (struct usb_setup_packet *detup,
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s32_t *transfer_len, u8_t **payload_data);
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/*
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* USB Endpoint Configuration
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*/
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struct usb_ep_cfg_data {
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/**
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* Callback function for notification of data received and
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* available to application or transmit done, NULL if callback
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* not required by application code
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*/
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usb_ep_callback ep_cb;
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/**
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* The number associated with the EP in the device configuration
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* structure
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* IN EP = 0x80 | \<endpoint number\>
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* OUT EP = 0x00 | \<endpoint number\>
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*/
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u8_t ep_addr;
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};
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/**
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* USB Interface Configuration
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*/
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struct usb_interface_cfg_data {
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/** Handler for USB Class specific Control (EP 0) communications */
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usb_request_handler class_handler;
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/** Handler for USB Vendor specific commands */
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usb_request_handler vendor_handler;
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/**
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* The custom request handler gets a first chance at handling
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* the request before it is handed over to the 'chapter 9' request
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* handler
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*/
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usb_request_handler custom_handler;
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/**
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* This data area, allocated by the application, is used to store
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* Class specific command data and must be large enough to store the
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* largest payload associated with the largest supported Class'
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* command set. This data area may be used for USB IN or OUT
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* communications
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*/
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u8_t *payload_data;
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/**
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* This data area, allocated by the application, is used to store
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* Vendor specific payload
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*/
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u8_t *vendor_data;
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};
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/*
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* @brief USB device configuration
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*
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* The Application instantiates this with given parameters added
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* using the "usb_set_config" function. Once this function is called
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* changes to this structure will result in undefined behaviour. This structure
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* may only be updated after calls to usb_deconfig
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*/
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struct usb_cfg_data {
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/**
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* USB device description, see
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* http://www.beyondlogic.org/usbnutshell/usb5.shtml#DeviceDescriptors
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*/
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const u8_t *usb_device_description;
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/** Callback to be notified on USB connection status change */
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usb_status_callback cb_usb_status;
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/** USB interface (Class) handler and storage space */
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struct usb_interface_cfg_data interface;
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/** Number of individual endpoints in the device configuration */
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u8_t num_endpoints;
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/**
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* Pointer to an array of endpoint structs of length equal to the
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* number of EP associated with the device description,
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* not including control endpoints
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*/
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struct usb_ep_cfg_data *endpoint;
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};
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/*
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* @brief configure USB controller
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*
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* Function to configure USB controller.
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* Configuration parameters must be valid or an error is returned
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*
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* @param[in] config Pointer to configuration structure
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_set_config(struct usb_cfg_data *config);
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/*
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* @brief return the USB device to it's initial state
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_deconfig(void);
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/*
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* @brief enable USB for host/device connection
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*
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* Function to enable USB for host/device connection.
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* Upon success, the USB module is no longer clock gated in hardware,
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* it is now capable of transmitting and receiving on the USB bus and
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* of generating interrupts.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_enable(struct usb_cfg_data *config);
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/*
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* @brief disable the USB device.
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*
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* Function to disable the USB device.
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* Upon success, the specified USB interface is clock gated in hardware,
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* it is no longer capable of generating interrupts.
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_disable(void);
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/*
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* @brief write data to the specified endpoint
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*
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* Function to write data to the specified endpoint. The supplied
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* usb_ep_callback will be called when transmission is done.
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*
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* @param[in] ep Endpoint address corresponding to the one listed in the
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* device configuration table
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* @param[in] data Pointer to data to write
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* @param[in] data_len Length of data requested to write. This may be zero for
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* a zero length status packet.
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* @param[out] bytes_ret Bytes written to the EP FIFO. This value may be NULL if
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* the application expects all bytes to be written
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_write(u8_t ep, const u8_t *data, u32_t data_len,
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u32_t *bytes_ret);
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/*
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* @brief read data from the specified endpoint
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*
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* This function is called by the Endpoint handler function, after an
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* OUT interrupt has been received for that EP. The application must
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* only call this function through the supplied usb_ep_callback function.
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*
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* @param[in] ep Endpoint address corresponding to the one listed in
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* the device configuration table
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* @param[in] data Pointer to data buffer to write to
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* @param[in] max_data_len Max length of data to read
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* @param[out] ret_bytes Number of bytes read. If data is NULL and
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* max_data_len is 0 the number of bytes available
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* for read is returned.
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_read(u8_t ep, u8_t *data, u32_t max_data_len,
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u32_t *ret_bytes);
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/*
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* @brief set STALL condition on the specified endpoint
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*
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* This function is called by USB device class handler code to set stall
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* conditionin on endpoint.
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*
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* @param[in] ep Endpoint address corresponding to the one listed in
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* the device configuration table
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_ep_set_stall(u8_t ep);
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/*
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* @brief clears STALL condition on the specified endpoint
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*
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* This function is called by USB device class handler code to clear stall
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* conditionin on endpoint.
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*
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* @param[in] ep Endpoint address corresponding to the one listed in
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* the device configuration table
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*
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* @return 0 on success, negative errno code on fail
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*/
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int usb_ep_clear_stall(u8_t ep);
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/**
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* @brief read data from the specified endpoint
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*
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* This is similar to usb_ep_read, the difference being that, it doesn't
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* clear the endpoint NAKs so that the consumer is not bogged down by further
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* upcalls till he is done with the processing of the data. The caller should
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* reactivate ep by invoking usb_ep_read_continue() do so.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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* @param[in] data pointer to data buffer to write to
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* @param[in] max_data_len max length of data to read
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* @param[out] read_bytes Number of bytes read. If data is NULL and
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* max_data_len is 0 the number of bytes
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* available for read should be returned.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_ep_read_wait(u8_t ep, u8_t *data, u32_t max_data_len,
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u32_t *read_bytes);
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/**
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* @brief Continue reading data from the endpoint
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*
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* Clear the endpoint NAK and enable the endpoint to accept more data
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* from the host. Usually called after usb_ep_read_wait() when the consumer
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* is fine to accept more data. Thus these calls together acts as flow control
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* mechanism.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_ep_read_continue(u8_t ep);
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#endif /* USB_DEVICE_H_ */
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