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/* Copyright 2018 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __HID_DEVICE_H
#define __HID_DEVICE_H
#include <stdint.h>
#include <stddef.h>
#include "hooks.h"
#define HID_SUBSYS_MAX_PAYLOAD_SIZE 4954
enum HID_SUBSYS_ERR {
HID_SUBSYS_ERR_NOT_READY = EC_ERROR_INTERNAL_FIRST + 0,
HID_SUBSYS_ERR_TOO_MANY_HID_DEVICES = EC_ERROR_INTERNAL_FIRST + 1,
};
typedef void * hid_handle_t;
#define HID_INVALID_HANDLE NULL
struct hid_callbacks {
/*
* function called during registration.
* if returns non-zero, the registration will fail.
*/
int (*initialize)(const hid_handle_t handle);
/* return size of data copied to buf. if returns <= 0, error */
int (*get_hid_descriptor)(const hid_handle_t handle, uint8_t *buf,
const size_t buf_size);
/* return size of data copied to buf. if return <= 0, error */
int (*get_report_descriptor)(const hid_handle_t handle, uint8_t *buf,
const size_t buf_size);
/* return size of data copied to buf. if return <= 0, error */
int (*get_feature_report)(const hid_handle_t handle,
const uint8_t report_id, uint8_t *buf,
const size_t buf_size);
/* return tranferred data size. if returns <= 0, error */
int (*set_feature_report)(const hid_handle_t handle,
const uint8_t report_id, const uint8_t *data,
const size_t data_size);
/* return size of data copied to buf. if returns <= 0, error */
int (*get_input_report)(const hid_handle_t handle,
const uint8_t report_id, uint8_t *buf,
const size_t buf_size);
/* suspend/resume, if returns non-zero, error */
int (*resume)(const hid_handle_t handle);
int (*suspend)(const hid_handle_t handle);
};
struct hid_device {
uint8_t dev_class;
uint16_t pid;
uint16_t vid;
const struct hid_callbacks *cbs;
};
/*
* Do not call this function directly.
* The function should be called only by HID_DEVICE_ENTRY()
*/
hid_handle_t hid_subsys_register_device(const struct hid_device *dev_info);
/* send HID input report */
int hid_subsys_send_input_report(const hid_handle_t handle, uint8_t *buf,
const size_t buf_size);
/* store HID device specific data */
int hid_subsys_set_device_data(const hid_handle_t handle, void *data);
/* retrieve HID device specific data */
void *hid_subsys_get_device_data(const hid_handle_t handle);
#define HID_DEVICE_ENTRY(hid_dev) \
void _hid_dev_entry_##hid_dev(void) \
{ \
hid_subsys_register_device(&(hid_dev)); \
} \
DECLARE_HOOK(HOOK_INIT, _hid_dev_entry_##hid_dev, HOOK_PRIO_LAST - 2)
#endif /* __HID_DEVICE_H */
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