/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include <stdbool.h>
#include <sys/queue.h>
#include "esp_err.h"
#include "usb_private.h"
#include "usb/usb_types_ch9.h"
// ------------------------------------------------- Macros & Types ----------------------------------------------------
// ----------------------- States --------------------------
/**
* @brief States of the HCD port
*
* @note The port can be thought of as an abstraction of the Root Hub that contains
* a single port.
* @note These states roughly match the port states outlined in 11.5.1 of the
* USB2.0 specification.
*/
typedef enum {
HCD_PORT_STATE_NOT_POWERED, /**< The port is not powered */
HCD_PORT_STATE_DISCONNECTED, /**< The port is powered but no device is connected */
HCD_PORT_STATE_DISABLED, /**< A device has connected to the port but has not been reset. SOF/keep alive are not being sent */
HCD_PORT_STATE_RESETTING, /**< The port is issuing a reset condition */
HCD_PORT_STATE_SUSPENDED, /**< The port has been suspended. */
HCD_PORT_STATE_RESUMING, /**< The port is issuing a resume condition */
HCD_PORT_STATE_ENABLED, /**< The port has been enabled. SOF/keep alive are being sent */
HCD_PORT_STATE_RECOVERY, /**< Port needs to be recovered from a fatal error (port error, overcurrent, or sudden disconnection) */
} hcd_port_state_t;
/**
* @brief States of an HCD pipe
*
* Active:
* - Pipe is able to transmit data. URBs can be enqueued.
* - Even if pipe has no URBs enqueued, it can still be in the active state.
* Halted:
* - An error has occurred on the pipe. URBs will no longer be executed.
* - Halt should be cleared using the HCD_PIPE_CMD_CLEAR command
*/
typedef enum {
HCD_PIPE_STATE_ACTIVE, /**< The pipe is active */
HCD_PIPE_STATE_HALTED, /**< The pipe is halted */
} hcd_pipe_state_t;
// ----------------------- Events --------------------------
/**
* @brief HCD port events
*
* On receiving a port event, hcd_port_handle_event() should be called to handle that event
*/
typedef enum {
HCD_PORT_EVENT_NONE, /**< No event has occurred. Or the previous event is no longer valid */
HCD_PORT_EVENT_CONNECTION, /**< A device has been connected to the port */
HCD_PORT_EVENT_DISCONNECTION, /**< A device disconnection has been detected */
HCD_PORT_EVENT_ERROR, /**< A port error has been detected. Port is now HCD_PORT_STATE_RECOVERY */
HCD_PORT_EVENT_OVERCURRENT, /**< Overcurrent detected on the port. Port is now HCD_PORT_STATE_RECOVERY */
} hcd_port_event_t;
/**
* @brief HCD pipe events
*
* @note Pipe error events will put the pipe into the HCD_PIPE_STATE_HALTED state
*/
typedef enum {
HCD_PIPE_EVENT_NONE, /**< The pipe has no events (used to indicate no events when polling) */
HCD_PIPE_EVENT_URB_DONE, /**< The pipe has completed an URB. The URB can be dequeued */
HCD_PIPE_EVENT_ERROR_XFER, /**< Excessive (three consecutive) transaction errors (e.g., no ACK, bad CRC etc) */
HCD_PIPE_EVENT_ERROR_URB_NOT_AVAIL, /**< URB was not available */
HCD_PIPE_EVENT_ERROR_OVERFLOW, /**< Received more data than requested. Usually a Packet babble error
(i.e., an IN packet has exceeded the endpoint's MPS) */
HCD_PIPE_EVENT_ERROR_STALL, /**< Pipe received a STALL response received */
} hcd_pipe_event_t;
// ---------------------- Commands -------------------------
/**
* @brief HCD port commands
*/
typedef enum {
HCD_PORT_CMD_POWER_ON, /**< Power ON the port */
HCD_PORT_CMD_POWER_OFF, /**< Power OFF the port. If the port is enabled, this will cause a HCD_PORT_EVENT_SUDDEN_DISCONN event.
If the port is disabled, this will cause a HCD_PORT_EVENT_DISCONNECTION event. */
HCD_PORT_CMD_RESET, /**< Issue a reset on the port */
HCD_PORT_CMD_SUSPEND, /**< Suspend the port. All pipes must be halted */
HCD_PORT_CMD_RESUME, /**< Resume the port */
HCD_PORT_CMD_DISABLE, /**< Disable the port (stops the SOFs or keep alive). All pipes must be halted. */
} hcd_port_cmd_t;
/**
* @brief HCD pipe commands
*
* The pipe commands represent the list of pipe manipulations outlined in 10.5.2.2. of USB2.0 specification.
*/
typedef enum {
HCD_PIPE_CMD_HALT, /**< Halt an active pipe. The currently executing URB will be canceled. Enqueued URBs are left untouched */
HCD_PIPE_CMD_FLUSH, /**< Can only be called when halted. Will cause all enqueued URBs to be canceled */
HCD_PIPE_CMD_CLEAR, /**< Causes a halted pipe to become active again. Any enqueued URBs will being executing.*/
} hcd_pipe_cmd_t;
// -------------------- Object Types -----------------------
/**
* @brief Port handle type
*/
typedef void * hcd_port_handle_t;
/**
* @brief Pipe handle type
*/
typedef void * hcd_pipe_handle_t;
/**
* @brief Port event callback type
*
* This callback is run when a port event occurs
*/
typedef bool (*hcd_port_callback_t)(hcd_port_handle_t port_hdl, hcd_port_event_t port_event, void *user_arg, bool in_isr);
/**
* @brief Pipe event callback
*
* This callback is run when a pipe event occurs
*/
typedef bool (*hcd_pipe_callback_t)(hcd_pipe_handle_t pipe_hdl, hcd_pipe_event_t pipe_event, void *user_arg, bool in_isr);
typedef enum {
HCD_PORT_FIFO_BIAS_BALANCED, /**< Balanced FIFO sizing for RX, Non-periodic TX, and periodic TX */
HCD_PORT_FIFO_BIAS_RX, /**< Bias towards a large RX FIFO */
HCD_PORT_FIFO_BIAS_PTX, /**< Bias towards periodic TX FIFO */
} hcd_port_fifo_bias_t;
/**
* @brief HCD configuration structure
*/
typedef struct {
int intr_flags; /**< Interrupt flags for HCD interrupt */
} hcd_config_t;
/**
* @brief Port configuration structure
*/
typedef struct {
hcd_port_fifo_bias_t fifo_bias; /**< HCD port internal FIFO biasing */
hcd_port_callback_t callback; /**< HCD port event callback */
void *callback_arg; /**< User argument for HCD port callback */
void *context; /**< Context variable used to associate the port with upper layer object */
} hcd_port_config_t;
/**
* @brief Pipe configuration structure
*
* @note The callback can be set to NULL if no callback is required (e.g., using HCD in a polling manner).
*/
typedef struct {
hcd_pipe_callback_t callback; /**< HCD pipe event ISR callback */
void *callback_arg; /**< User argument for HCD pipe callback */
void *context; /**< Context variable used to associate the pipe with upper layer object */
const usb_ep_desc_t *ep_desc; /**< Pointer to endpoint descriptor of the pipe */
usb_speed_t dev_speed; /**< Speed of the device */
uint8_t dev_addr; /**< Device address of the pipe */
} hcd_pipe_config_t;
// --------------------------------------------- Host Controller Driver ------------------------------------------------
/**
* @brief Installs the Host Controller Driver
*
* - Allocates memory and interrupt resources for the HCD and underlying ports
*
* @note This function must be called before any other HCD function is called
* @note Before calling this function, the Host Controller must already be un-clock gated and reset. The USB PHY
* (internal or external, and associated GPIOs) must already be configured.
*
* @param config HCD configuration
* @retval ESP_OK: HCD successfully installed
* @retval ESP_ERR_NO_MEM: Insufficient memory
* @retval ESP_ERR_INVALID_STATE: HCD is already installed
* @retval ESP_ERR_NOT_FOUND: HCD could not allocate interrupt
* @retval ESP_ERR_INVALID_ARG: Arguments are invalid
*/
esp_err_t hcd_install(const hcd_config_t *config);
/**
* @brief Uninstalls the HCD
*
* Before uninstalling the HCD, the following conditions should be met:
* - All ports must be uninitialized, all pipes freed
*
* @note This function will simply free the resources used by the HCD. The underlying Host Controller and USB PHY will
* not be disabled.
*
* @retval ESP_OK: HCD successfully uninstalled
* @retval ESP_ERR_INVALID_STATE: HCD is not in the right condition to be uninstalled
*/
esp_err_t hcd_uninstall(void);
// ---------------------------------------------------- HCD Port -------------------------------------------------------
/**
* @brief Initialize a particular port of the HCD
*
* After a port is initialized, it will be put into the HCD_PORT_STATE_NOT_POWERED state.
*
* @note The host controller only has one port, thus the only valid port_number is 1
*
* @param[in] port_number Port number
* @param[in] port_config Port configuration
* @param[out] port_hdl Port handle
* @retval ESP_OK: Port enabled
* @retval ESP_ERR_NO_MEM: Insufficient memory
* @retval ESP_ERR_INVALID_STATE: The port is already enabled
* @retval ESP_ERR_NOT_FOUND: Port number not found
* @retval ESP_ERR_INVALID_ARG: Arguments are invalid
*/
esp_err_t hcd_port_init(int port_number, const hcd_port_config_t *port_config, hcd_port_handle_t *port_hdl);
/**
* @brief Deinitialize a particular port
*
* The port must be placed in the HCD_PORT_STATE_NOT_POWERED or HCD_PORT_STATE_RECOVERY state before it can be
* deinitialized.
*
* @param port_hdl Port handle
* @retval ESP_OK: Port disabled
* @retval ESP_ERR_INVALID_STATE: The port is not in a condition to be disabled (not unpowered)
*/
esp_err_t hcd_port_deinit(hcd_port_handle_t port_hdl);
/**
* @brief Execute a port command
*
* Call this function to manipulate a port (e.g., powering it ON, sending a reset etc). The following conditions
* must be met when calling this function:
* - The port is in the correct state for the command (e.g., port must be suspended in order to use the resume command)
* - The port does not have any pending events
*
* @note This function is internally protected by a mutex. If multiple threads call this function, this function will
* can block.
* @note The function can block
* @note For some of the commands that involve a blocking delay (e.g., reset and resume), if the port's state changes
* unexpectedly (e.g., a disconnect during a resume), this function will return ESP_ERR_INVALID_RESPONSE.
*
* @param port_hdl Port handle
* @param command Command for the HCD port
* @retval ESP_OK: Command executed successfully
* @retval ESP_ERR_INVALID_STATE: Conditions have not been met to call this function
* @retval ESP_ERR_INVALID_RESPONSE: The command is no longer valid due to a change in the port's state
*/
esp_err_t hcd_port_command(hcd_port_handle_t port_hdl, hcd_port_cmd_t command);
/**
* @brief Get the port's current state
*
* @param port_hdl Port handle
* @return hcd_port_state_t Current port state
*/
hcd_port_state_t hcd_port_get_state(hcd_port_handle_t port_hdl);
/**
* @brief Get the speed of the port
*
* The speed of the port is determined by the speed of the device connected to it.
*
* @note This function is only valid after a device directly to the port and has been reset
*
* @param[in port_hdl Port handle
* @param[out] speed Speed of the port
* @retval ESP_OK Device speed obtained
* @retval ESP_ERR_INVALID_STATE: No valid device connected to the port
* @retval ESP_ERR_INVALID_ARG: Invalid arguments
*/
esp_err_t hcd_port_get_speed(hcd_port_handle_t port_hdl, usb_speed_t *speed);
/**
* @brief Handle a ports event
*
* When an port event occurs (as indicated by a callback), this function should be called the handle this event. A
* port's event should always be handled before attempting to execute a port command. Note that is actually handled
* may be different than the event reflected in the callback.
*
* If the port has no events, this function will return HCD_PORT_EVENT_NONE.
*
* @note If callbacks are not used, this function can also be used in a polling manner to repeatedly check for and
* handle a port's events.
* @note This function is internally protected by a mutex. If multiple threads call this function, this function will
* can block.
*
* @param port_hdl Port handle
* @return hcd_port_event_t The port event that was handled
*/
hcd_port_event_t hcd_port_handle_event(hcd_port_handle_t port_hdl);
/**
* @brief Recover a port after a fatal error has occurred on it
*
* The port must be in the HCD_PORT_STATE_RECOVERY state to be called. Recovering the port will involve issuing a soft
* reset on the underlying USB controller. The port will be returned to the HCD_PORT_STATE_NOT_POWERED state.
*
* @param port_hdl Port handle
* @retval ESP_OK Port recovered successfully
* @retval ESP_ERR_INVALID_STATE Port is not in the HCD_PORT_STATE_RECOVERY state
*/
esp_err_t hcd_port_recover(hcd_port_handle_t port_hdl);
/**
* @brief Get the context variable of a port
*
* @param port_hdl Port handle
* @return void* Context variable
*/
void *hcd_port_get_context(hcd_port_handle_t port_hdl);
/**
* @brief Set the bias of the HCD port's internal FIFO
*
* @note This function can only be called when the following conditions are met:
* - Port is initialized
* - Port does not have any pending events
* - Port does not have any allocated pipes
*
* @param port_hdl Port handle
* @param bias Fifo bias
* @retval ESP_OK FIFO sizing successfully set
* @retval ESP_ERR_INVALID_STATE Incorrect state for FIFO sizes to be set
*/
esp_err_t hcd_port_set_fifo_bias(hcd_port_handle_t port_hdl, hcd_port_fifo_bias_t bias);
// --------------------------------------------------- HCD Pipes -------------------------------------------------------
/**
* @brief Allocate a pipe
*
* When allocating a pipe, the HCD will assess whether there are sufficient resources (i.e., bus time, and controller
* channels). If sufficient, the pipe will be allocated.
*
* @note The host port must be in the enabled state before a pipe can be allocated
*
* @param[in] port_hdl Handle of the port this pipe will be routed through
* @param[in] pipe_config Pipe configuration
* @param[out] pipe_hdl Pipe handle
*
* @retval ESP_OK: Pipe successfully allocated
* @retval ESP_ERR_NO_MEM: Insufficient memory
* @retval ESP_ERR_INVALID_ARG: Arguments are invalid
* @retval ESP_ERR_INVALID_STATE: Host port is not in the correct state to allocate a pipe
* @retval ESP_ERR_NOT_SUPPORTED: The pipe's configuration cannot be supported
*/
esp_err_t hcd_pipe_alloc(hcd_port_handle_t port_hdl, const hcd_pipe_config_t *pipe_config, hcd_pipe_handle_t *pipe_hdl);
/**
* @brief Free a pipe
*
* Frees the resources used by an HCD pipe. The pipe's handle should be discarded after calling this function. The pipe
* must be in following condition before it can be freed:
* - All URBs have been dequeued
*
* @param pipe_hdl Pipe handle
*
* @retval ESP_OK: Pipe successfully freed
* @retval ESP_ERR_INVALID_STATE: Pipe is not in a condition to be freed
*/
esp_err_t hcd_pipe_free(hcd_pipe_handle_t pipe_hdl);
/**
* @brief Update a pipe's maximum packet size
*
* This function is intended to be called on default pipes during enumeration in order to update the pipe's maximum
* packet size. This function can only be called on a pipe that has met the following conditions:
* - Pipe is not current processing a command
* - Pipe does not have any enqueued URBs
* - Port cannot be resetting
*
* @param pipe_hdl Pipe handle
* @param mps New Maximum Packet Size
*
* @retval ESP_OK: Pipe successfully updated
* @retval ESP_ERR_INVALID_STATE: Pipe is not in a condition to be updated
*/
esp_err_t hcd_pipe_update_mps(hcd_pipe_handle_t pipe_hdl, int mps);
/**
* @brief Update a pipe's device address
*
* This function is intended to be called on default pipes during enumeration in order to update the pipe's device
* address. This function can only be called on a pipe that has met the following conditions:
* - Pipe is not current processing a command
* - Pipe does not have any enqueued URBs
* - Port cannot be resetting
*
* @param pipe_hdl Pipe handle
* @param dev_addr New device address
*
* @retval ESP_OK: Pipe successfully updated
* @retval ESP_ERR_INVALID_STATE: Pipe is not in a condition to be updated
*/
esp_err_t hcd_pipe_update_dev_addr(hcd_pipe_handle_t pipe_hdl, uint8_t dev_addr);
/**
* @brief Update a pipe's callback
*
* This function is intended to be called on default pipes at the end of enumeration to switch to a callback that
* handles the completion of regular control transfer.
* - Pipe is not current processing a command
* - Pipe does not have any enqueued URBs
* - Port cannot be resetting
*
* @param pipe_hdl Pipe handle
* @param callback Callback
* @param user_arg Callback argument
* @return esp_err_t
*/
esp_err_t hcd_pipe_update_callback(hcd_pipe_handle_t pipe_hdl, hcd_pipe_callback_t callback, void *user_arg);
/**
* @brief Make a pipe persist through a run time reset
*
* Normally when a HCD_PORT_CMD_RESET is called, all pipes should already have been freed. However There may be cases
* (such as during enumeration) when a pipe must persist through a reset. This function will mark a pipe as
* persistent allowing it to survive a reset. When HCD_PORT_CMD_RESET is called, the pipe can continue to be used after
* the reset.
*
* @param pipe_hdl Pipe handle
* @retval ESP_OK: Pipe successfully marked as persistent
* @retval ESP_ERR_INVALID_STATE: Pipe is not in a condition to be made persistent
*/
esp_err_t hcd_pipe_set_persist_reset(hcd_pipe_handle_t pipe_hdl);
/**
* @brief Get the context variable of a pipe from its handle
*
* @param pipe_hdl Pipe handle
* @return void* Context variable
*/
void *hcd_pipe_get_context(hcd_pipe_handle_t pipe_hdl);
/**
* @brief Get the current sate of the pipe
*
* @param pipe_hdl Pipe handle
* @return hcd_pipe_state_t Current state of the pipe
*/
hcd_pipe_state_t hcd_pipe_get_state(hcd_pipe_handle_t pipe_hdl);
/**
* @brief Execute a command on a particular pipe
*
* Pipe commands allow a pipe to be manipulated (such as clearing a halt, retiring all URBs etc)
*
* @note This function can block
*
* @param pipe_hdl Pipe handle
* @param command Pipe command
* @retval ESP_OK: Command executed successfully
* @retval ESP_ERR_INVALID_STATE: The pipe is not in the correct state/condition too execute the command
*/
esp_err_t hcd_pipe_command(hcd_pipe_handle_t pipe_hdl, hcd_pipe_cmd_t command);
/**
* @brief Get the last event that occurred on a pipe
*
* This function allows a pipe to be polled for events (i.e., when callbacks are not used). Once an event has been
* obtained, this function reset the last event of the pipe to HCD_PIPE_EVENT_NONE.
*
* @param pipe_hdl Pipe handle
* @return hcd_pipe_event_t Last pipe event to occur
*/
hcd_pipe_event_t hcd_pipe_get_event(hcd_pipe_handle_t pipe_hdl);
// ---------------------------------------------------- HCD URBs -------------------------------------------------------
/**
* @brief Enqueue an URB to a particular pipe
*
* The following conditions must be met before an URB can be enqueued:
* - The URB is properly initialized (data buffer and transfer length are set)
* - The URB must not already be enqueued
* - The pipe must be in the HCD_PIPE_STATE_ACTIVE state
* - The pipe cannot be executing a command
*
* @param pipe_hdl Pipe handle
* @param urb URB to enqueue
* @retval ESP_OK: URB enqueued successfully
* @retval ESP_ERR_INVALID_STATE: Conditions not met to enqueue URB
*/
esp_err_t hcd_urb_enqueue(hcd_pipe_handle_t pipe_hdl, urb_t *urb);
/**
* @brief Dequeue an URB from a particular pipe
*
* This function should be called on a pipe after a pipe receives a HCD_PIPE_EVENT_URB_DONE event. If a pipe has
* multiple URBs that can be dequeued, this function should be called repeatedly until all URBs are dequeued. If a pipe
* has no more URBs to dequeue, this function will return NULL.
*
* @param pipe_hdl Pipe handle
* @return urb_t* Dequeued URB, or NULL if no more URBs to dequeue
*/
urb_t *hcd_urb_dequeue(hcd_pipe_handle_t pipe_hdl);
/**
* @brief Abort an enqueued URB
*
* This function will attempt to abort an URB that is already enqueued. If the URB has yet to be executed, it will be
* "canceled" and can then be dequeued. If the URB is currently in-flight or has already completed, the URB will not be
* affected by this function.
*
* @param urb URB to abort
* @retval ESP_OK: URB successfully aborted, or was not affected by this function
* @retval ESP_ERR_INVALID_STATE: URB was never enqueued
*/
esp_err_t hcd_urb_abort(urb_t *urb);
#ifdef __cplusplus
}
#endif