/*
 * char_device.h
 * 
 * Copyright (C) 2015 Aleksandar Andrejevic <theflash@sdf.lonestar.org>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _CHAR_DEVICE_H_
#define _CHAR_DEVICE_H_

#include <common.h>
#include <list.h>
#include <sync.h>

#define MAX_CHAR_DEV_NAME 32

#define IOCTL_CHAR_DEV_CHECK_INPUT  0xC0000000
#define IOCTL_CHAR_DEV_CHECK_OUTPUT 0xC0000001

typedef struct _char_device_t char_device_t;

typedef dword_t (*char_dev_init_proc_t)(void);
typedef dword_t (*char_dev_cleanup_proc_t)(void);
typedef dword_t (*char_dev_read_proc_t)(char_device_t *device, void *buffer, size_t length, size_t *bytes_read);
typedef dword_t (*char_dev_write_proc_t)(char_device_t *device, const void *buffer, size_t length, size_t *bytes_written);
typedef dword_t (*char_dev_ioctl_proc_t)(
    char_device_t *device,
    dword_t control_code,
    const void *in_buffer,
    size_t in_length,
    void *out_buffer,
    size_t out_length
);

typedef struct
{
    list_entry_t list;
    char_dev_init_proc_t init_proc;
    char_dev_cleanup_proc_t cleanup_proc;
    char_dev_read_proc_t read_proc;
    char_dev_write_proc_t write_proc;
    char_dev_ioctl_proc_t ioctl_proc;
} char_dev_driver_t;

struct _char_device_t
{
    list_entry_t list;
    char_dev_driver_t *driver;
    char name[MAX_CHAR_DEV_NAME];
    resource_t resource;
};

dword_t register_char_dev_driver(char_dev_driver_t *driver);
dword_t unregister_char_dev_driver(char_dev_driver_t *driver);
char_device_t *get_char_device(const char *name);
dword_t register_char_device(char_device_t *device);
dword_t unregister_char_device(char_device_t *device);
dword_t enum_char_devices(char *device_names, size_t *size);
dword_t char_device_read(const char *name, void *buffer, size_t length, size_t *bytes_read);
dword_t char_device_write(const char *name, const void *buffer, size_t length, size_t *bytes_written);
dword_t char_device_ioctl(const char *name, dword_t control_code, const void *in_buffer, size_t in_length, void *out_buffer, size_t out_length);

#endif