/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2025 Google Corporation
 */

#ifndef __HCI_DRV_H
#define __HCI_DRV_H

#include <linux/types.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci.h>

struct hci_drv_cmd_hdr {
        __le16  opcode;
        __le16  len;
} __packed;

struct hci_drv_ev_hdr {
        __le16  opcode;
        __le16  len;
} __packed;

#define HCI_DRV_EV_CMD_STATUS   0x0000
struct hci_drv_ev_cmd_status {
        __le16  opcode;
        __u8    status;
} __packed;

#define HCI_DRV_EV_CMD_COMPLETE 0x0001
struct hci_drv_ev_cmd_complete {
        __le16  opcode;
        __u8    status;
        __u8    data[];
} __packed;

#define HCI_DRV_STATUS_SUCCESS                  0x00
#define HCI_DRV_STATUS_UNSPECIFIED_ERROR        0x01
#define HCI_DRV_STATUS_UNKNOWN_COMMAND          0x02
#define HCI_DRV_STATUS_INVALID_PARAMETERS       0x03

#define HCI_DRV_MAX_DRIVER_NAME_LENGTH  32

/* Common commands that make sense on all drivers start from 0x0000 */
#define HCI_DRV_OP_READ_INFO    0x0000
#define HCI_DRV_READ_INFO_SIZE  0
struct hci_drv_rp_read_info {
        __u8    driver_name[HCI_DRV_MAX_DRIVER_NAME_LENGTH];
        __le16  num_supported_commands;
        __le16  supported_commands[] __counted_by_le(num_supported_commands);
} __packed;

/* Driver specific OGF (Opcode Group Field)
 * Commands in this group may have different meanings across different drivers.
 */
#define HCI_DRV_OGF_DRIVER_SPECIFIC     0x01

int hci_drv_cmd_status(struct hci_dev *hdev, u16 cmd, u8 status);
int hci_drv_cmd_complete(struct hci_dev *hdev, u16 cmd, u8 status, void *rp,
                         size_t rp_len);
int hci_drv_process_cmd(struct hci_dev *hdev, struct sk_buff *cmd_skb);

struct hci_drv_handler {
        int (*func)(struct hci_dev *hdev, void *data, u16 data_len);
        size_t data_len;
};

struct hci_drv {
        size_t common_handler_count;
        const struct hci_drv_handler *common_handlers;

        size_t specific_handler_count;
        const struct hci_drv_handler *specific_handlers;
};

#endif /* __HCI_DRV_H */