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