target.h

 
#pragma once
 
#include <stdbool.h>
#include <stdint.h>
 
#include <joybus/attributes.h>
#include <joybus/errors.h>
 
struct joybus_target;

#define JOYBUS_TARGET(target) ((struct joybus_target *)(target))

typedef void (*joybus_target_response_cb)(const uint8_t *response, uint8_t len, void *user_data);

struct joybus_target_api {
  int (*byte_received)(struct joybus_target *target, const uint8_t *command, uint8_t byte_idx,
                       joybus_target_response_cb send_response, void *user_data);
};

struct joybus_target {
  const struct joybus_target_api *api;

  bool attached;

  struct joybus_target *next;
};

static inline int joybus_target_byte_received(struct joybus_target *target, const uint8_t *command, uint8_t byte_idx,
                                              joybus_target_response_cb send_response, void *user_data)
{
  // No target attached to handle the command
  if (!target)
    return -JOYBUS_ERR_NOT_SUPPORTED;
 
  return target->api->byte_received(target, command, byte_idx, send_response, user_data);
}

static inline bool joybus_target_is_attached(struct joybus_target *target)
{
  return target->attached;
}