chdev.c

Bycore是一个嵌入式操作系统内核。Bycore包括内存管理、任务管理、中断管理、任务互斥、同步与通信管理等功能。Bycore全部由C语言完成

/**
 *  chdev.c - Related calls for char device driver
 *
 *  Copyright (C) 2008  ZhangHu
 *  All rights reserved.
 *  E-MAIL: [e-mail]
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "include/types.h"
#include "include/list.h"
#include "include/mem.h"
#include "include/irq.h"
#include "drivers/chdev.h"
#include "common/string.h"


/**
 * chdevRegister - Register a device to Bycore.
 * @Mid: Main ID.
 * @Sid: Secondary ID.
 * @Name: Device name.
 * @Operation: Pointer to operations of device.
 * @return: DEV_OK if successful, otherwise reasons about failure.
 *
 * @notes:
 */
word_t chdevRegister(char_t Mid, char_t Sid,
                     const char_t *Name,
                     struct chdev_operations *Operation) {
    chdev_t *pchdev;

    if(Mid >= DEVICE_NR) {
        return DEV_FALSE;
    }
    if((pchdev = (chdev_t*)kmalloc(sizeof(chdev_t))) == NULL) {
        return DEV_NO_MEM;
    }

    pchdev->op = Operation;
    pchdev->loff = 0;
    return char_device_register(&pchdev->dev, Name, Mid, Sid);
}

/**
 * chdevUnRegister - Unregister a device from Bycore.
 * @Mid: Main ID.
 * @Sid: Secondary ID.
 * @return: DEV_OK if successful, otherwise DEV_FALSE.
 *
 * @notes:
 */
word_t chdevUnRegister(uword_t chdevMID, uword_t chdevSID) {
    chdev_t *pchdev;
    device_t *dev;

    if((dev = device_delete(chdevMID, chdevSID)) == NULL) {
        return DEV_FALSE;
    }
    pchdev = (chdev_t*)dev;

    if(pchdev->op->release != NULL)
    {
        pchdev->op->release();
    }

    kfree(pchdev);
    return DEV_OK;
}