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88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
#include "chardev.h"
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#include "internal.h"
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#include <filesystem/VFS/VFS.h>
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#include <common/mutex.h>
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#include <common/stdlib.h>
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#include <common/string.h>
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#include <common/printk.h>
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static struct vfs_dir_entry_t *chardev_folder_dentry = NULL;
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extern struct vfs_dir_entry_t *devfs_root_dentry;
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/**
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* @brief 字符设备名称前缀
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*
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*/
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static char chardev_name_prefix[CHAR_DEV_STYPE_END + 1][32] = {
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[CHAR_DEV_STYPE_START] = "",
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[CHAR_DEV_STYPE_PS2_KEYBOARD] = "ps2.kb",
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[CHAR_DEV_STYPE_PS2_MOUSE] = "ps2.mse",
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[CHAR_DEV_STYPE_USB_MOUSE] = "usb.mse",
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[CHAR_DEV_STYPE_USB_KEYBOARD] = "usb.kb",
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[CHAR_DEV_STYPE_BLUETOOTH_MOUSE] = "bt.mse",
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[CHAR_DEV_STYPE_BLUETOOTH_KEYBOARD] = "bt.kb",
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[CHAR_DEV_STYPE_TTY] = "vdev.tty",
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[CHAR_DEV_STYPE_END] = "",
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};
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/**
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* @brief 为不同类型的字符设备分配的管理信息结构体
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*
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*/
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static struct chardev_manage_info_t
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{
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mutex_t lock; // 操作互斥锁
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int count;
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} chardev_manage_info[CHAR_DEV_STYPE_END + 1];
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/**
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* @brief 在devfs中注册字符设备（该函数只应被devfs调用）
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*
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* @param private_info inode私有信息
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* @param target_dentry 返回的dentry的指针
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* @return int 错误码
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*/
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int __devfs_chardev_register(struct devfs_private_inode_info_t *private_info, struct vfs_dir_entry_t **target_dentry)
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{
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// 检测subtype是否合法
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if (private_info->sub_type <= CHAR_DEV_STYPE_START || private_info->sub_type >= CHAR_DEV_STYPE_END)
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return -EINVAL;
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mutex_lock(&chardev_manage_info[private_info->sub_type].lock);
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// 拷贝名称
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char devname[64] = {0};
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strcpy(devname, chardev_name_prefix[private_info->sub_type]);
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char *ptr = devname + strlen(chardev_name_prefix[private_info->sub_type]);
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sprintk(ptr, "%d", chardev_manage_info[private_info->sub_type].count);
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int namelen = strlen(devname);
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struct vfs_dir_entry_t *dentry = vfs_alloc_dentry(namelen + 1);
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__devfs_fill_dentry(dentry, devname);
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__devfs_fill_inode(dentry, vfs_alloc_inode(), VFS_IF_DEVICE, private_info);
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// 将dentry挂载到char文件夹下
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__devfs_dentry_bind_parent(chardev_folder_dentry, dentry);
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++chardev_manage_info[private_info->sub_type].count;
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mutex_unlock(&chardev_manage_info[private_info->sub_type].lock);
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*target_dentry = dentry;
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return 0;
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}
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/**
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* @brief 初始化chardev管理机制
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*
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*/
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void __devfs_chardev_init()
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{
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// 初始化管理信息结构体
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for (int i = CHAR_DEV_STYPE_START + 1; i < CHAR_DEV_STYPE_END; ++i)
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{
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mutex_init(&chardev_manage_info[i].lock);
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chardev_manage_info[i].count = 0;
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}
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vfs_mkdir("/dev/char", 0, false);
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// 获取char dev的dentry
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chardev_folder_dentry = __devfs_find_dir(devfs_root_dentry, "char");
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} |