tty关键结构体清单及其分层简述

一： 用户层：

1

 //字符设备操作集   /kernel/include/linux/fs.h   static const struct file_operations tty_fops = {        .llseek     = no_llseek,        .read       = tty_read,        .write      = tty_write,        .poll       = tty_poll,        .unlocked_ioctl = tty_ioctl,        .compat_ioctl   = tty_compat_ioctl,        .open       = tty_open,        .release    = tty_release,        .fasync     = tty_fasync,    };    调用位置在  /kernel/driver/tty/Tty_io.c    static const struct file_operations tty_fops{ ... }

二 ： tty_core层：

2.1

 //tty驱动结构体    /kernel/include/linux/tty_driver.h    struct tty_driver {    int magic;      /* magic number for this structure */    struct kref kref;   /* Reference management */    struct cdev **cdevs;    struct module   *owner;    const char  *driver_name;    const char  *name;    int name_base;  /* offset of printed name */    int major;      /* major device number */    int minor_start;    /* start of minor device number */    unsigned int    num;    /* number of devices allocated */    short   type;       /* type of tty driver */    short   subtype;    /* subtype of tty driver */    struct ktermios init_termios; /* Initial termios */    unsigned long   flags;      /* tty driver flags */    struct proc_dir_entry *proc_entry; /* /proc fs entry */    struct tty_driver *other; /* only used for the PTY driver */    struct tty_struct **ttys;    struct tty_port **ports;    struct ktermios **termios;    void *driver_state;    const struct tty_operations *ops;    struct list_head tty_drivers;    };    调用位置 ：/kernel/drivers/tty/serial/XXX.uart.c    struct tty_driver{ ... } 在设备驱动层 注册设备驱动时 创建初始化

2.2

//tty设备驱动 操作函数    /kernel/include/linux/tty_driver.h    struct tty_operations {    struct tty_struct * (*lookup)(struct tty_driver *driver,            struct inode *inode, int idx);    int  (*install)(struct tty_driver *driver, struct tty_struct *tty);    void (*remove)(struct tty_driver *driver, struct tty_struct *tty);    int  (*open)(struct tty_struct * tty, struct file * filp);    void (*close)(struct tty_struct * tty, struct file * filp);    void (*shutdown)(struct tty_struct *tty);    void (*cleanup)(struct tty_struct *tty);    int  (*write)(struct tty_struct * tty,              const unsigned char *buf, int count);    int  (*put_char)(struct tty_struct *tty, unsigned char ch);    void (*flush_chars)(struct tty_struct *tty);    int  (*write_room)(struct tty_struct *tty);    int  (*chars_in_buffer)(struct tty_struct *tty);    int  (*ioctl)(struct tty_struct *tty,            unsigned int cmd, unsigned long arg);    long (*compat_ioctl)(struct tty_struct *tty,                 unsigned int cmd, unsigned long arg);    void (*set_termios)(struct tty_struct *tty, struct ktermios * old);    void (*throttle)(struct tty_struct * tty);    void (*unthrottle)(struct tty_struct * tty);    void (*stop)(struct tty_struct *tty);    void (*start)(struct tty_struct *tty);    void (*hangup)(struct tty_struct *tty);    int (*break_ctl)(struct tty_struct *tty, int state);    void (*flush_buffer)(struct tty_struct *tty);    void (*set_ldisc)(struct tty_struct *tty);    void (*wait_until_sent)(struct tty_struct *tty, int timeout);    void (*send_xchar)(struct tty_struct *tty, char ch);    int (*tiocmget)(struct tty_struct *tty);    int (*tiocmset)(struct tty_struct *tty,            unsigned int set, unsigned int clear);    int (*resize)(struct tty_struct *tty, struct winsize *ws);    int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);    int (*get_icount)(struct tty_struct *tty,                struct serial_icounter_struct *icount);    #ifdef CONFIG_CONSOLE_POLL    int (*poll_init)(struct tty_driver *driver, int line, char *options);    int (*poll_get_char)(struct tty_driver *driver, int line);    void (*poll_put_char)(struct tty_driver *driver, int line, char ch);    #endif    const struct file_operations *proc_fops;    };    调用位置 ：  /kernel/drivers/tty/serial/serial_core.c    static const struct tty_operations uart_ops { ... }

三 ：线程规划层：

3.1

//给tty设备的线路规程    /kernel/include/linux : Tty_ldisc.h    struct tty_ldisc {        struct tty_ldisc_ops *ops;        struct tty_struct *tty;    };

3.2

//用来保存当前tty端口的信息    /kernel/include/linux/tty.h    struct tty_struct {    int magic;    struct kref kref;    struct device *dev;    struct tty_driver *driver;    const struct tty_operations *ops;    int index;    struct ld_semaphore ldisc_sem;    struct tty_ldisc *ldisc;   //具体关联的 线程    struct mutex atomic_write_lock;    struct mutex legacy_mutex;    struct mutex throttle_mutex;    struct rw_semaphore termios_rwsem;    struct mutex winsize_mutex;    spinlock_t ctrl_lock;    spinlock_t flow_lock;    /* Termios values are protected by the termios rwsem */    struct ktermios termios, termios_locked;    struct termiox *termiox;    /* May be NULL for unsupported */    char name[64];    struct pid *pgrp;       /* Protected by ctrl lock */    struct pid *session;    unsigned long flags;    int count;    struct winsize winsize;     /* winsize_mutex */    unsigned long stopped:1,    /* flow_lock */              flow_stopped:1,              unused:BITS_PER_LONG - 2;    int hw_stopped;    unsigned long ctrl_status:8,    /* ctrl_lock */              packet:1,              unused_ctrl:BITS_PER_LONG - 9;    unsigned int receive_room;  /* Bytes free for queue */    int flow_change;    struct tty_struct *link;    struct fasync_struct *fasync;    int alt_speed;      /* For magic substitution of 38400 bps */    wait_queue_head_t write_wait;    wait_queue_head_t read_wait;    struct work_struct hangup_work;    void *disc_data;    void *driver_data;    struct list_head tty_files;    #define N_TTY_BUF_SIZE 4096    int closing;    unsigned char *write_buf;    int write_cnt;    /* If the tty has a pending do_SAK, queue it here - akpm */    struct work_struct SAK_work;    struct tty_port *port;    };    调用位置 ： 在上层用户 open /dev/XXX 的时候创建并初始化     tty_struct{ ... }

3.3

 //线程规划ops(操作函数)    /kernel/include/linux : Tty_ldisc.h    struct tty_ldisc_ops tty_ldisc_N_TTY = {        .magic           = TTY_LDISC_MAGIC,        .name            = "n_tty",        .open            = n_tty_open,        .close           = n_tty_close,        .flush_buffer    = n_tty_flush_buffer,        .chars_in_buffer = n_tty_chars_in_buffer,        .read            = n_tty_read,        .write           = n_tty_write,        .ioctl           = n_tty_ioctl,        .set_termios     = n_tty_set_termios,        .poll            = n_tty_poll,        .receive_buf     = n_tty_receive_buf,        .write_wakeup    = n_tty_write_wakeup,        .fasync      = n_tty_fasync,        .receive_buf2    = n_tty_receive_buf2,    };    调用位置 ： /kernel/drivers/tty/n_tty.c    struct tty_ldisc_ops tty_ldisc_N_TTY{ ... }

四 Serial_driver设备层：

4.1

//tty设备驱动结构体     /kernel/include/linux/serial_core.h    struct uart_driver {        struct module       *owner;        const char      *driver_name;        const char      *dev_name;        int          major;        int          minor;        int          nr;        struct console      *cons;        struct uart_state   *state;        struct tty_driver   *tty_driver;    };    调用位置 ： /kernel/drivers/tty/serial/uartxxx.c    static struct uart_driver XXX_uart_driver

4.2

//tty设备空间    /kernel/include/linux/serial_core.h    struct uart_state {        struct tty_port     port;        enum uart_pm_state  pm_state;        struct circ_buf     xmit;        struct uart_port    *uart_port;    };

4.3

//tty真实的物理串口/kernel/include/linux/serial_core.hstruct uart_port {          spinlock_t      lock;           /* port lock */          unsigned long       iobase;         /* io端口基地址（物理） */          unsigned char __iomem   *membase;       /* io内存基地址（虚拟） */          unsigned int        (*serial_in)(struct uart_port *, int);          void            (*serial_out)(struct uart_port *, int, int);          unsigned int        irq;            /* 中断号 */          unsigned long       irqflags;       /* 中断标志  */          unsigned int        uartclk;        /* 串口时钟 */          unsigned int        fifosize;       /* 串口缓冲区大小 */          unsigned char       x_char;         /* xon/xoff char */          unsigned char       regshift;       /* 寄存器位移 */          unsigned char       iotype;         /* IO访问方式 */          unsigned char       unused1;          unsigned int        read_status_mask;   /* 关心 Rx error status */          unsigned int        ignore_status_mask; /* 忽略 Rx error status */          struct uart_state   *state;         /* pointer to parent state */          struct uart_icount  icount;         /* 串口信息计数器 */          struct console      *cons;          /* struct console, if any */      #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)          unsigned long       sysrq;          /* sysrq timeout */      #endif          upf_t           flags;          unsigned int        mctrl;          /* 当前的Moden 设置 */          unsigned int        timeout;        /* character-based timeout */          unsigned int        type;           /* 端口类型 */          const struct uart_ops   *ops;       /* 串口端口操作函数 */          unsigned int        custom_divisor;          unsigned int        line;           /* 端口索引 */          resource_size_t     mapbase;        /* io内存物理基地址 */          struct device       *dev;           /* 父设备 */          unsigned char       hub6;                     unsigned char       suspended;          unsigned char       unused[2];          void            *private_data;      /* generic platform data pointer */      };  调用位置 ： /kernel/drivers/tty/serial/uartxxx.cstatic struct XXX_port { struct uart_port port ... }    

4.4

//tty真实串口的操作集合    /kernel/include/linux/serial_core.h    struct uart_ops {               unsigned int (*tx_empty)(struct uart_port *);/* 串口的Tx FIFO缓存是否为空 */              void      (*set_mctrl)(struct uart_port *, unsigned int mctrl);   /* 设置串口modem控制 */              unsigned int    (*get_mctrl)(struct uart_port *);   /* 获取串口modem控制 */              void     (*stop_tx)(struct uart_port *);     /* 禁止串口发送数据 */              void     (*start_tx)(struct uart_port *);    /* 使能串口发送数据 */                void     (*send_xchar)(struct uart_port *, char ch); /* 发送xChar */              void     (*stop_rx)(struct uart_port *);    /* 禁止串口接收数据 */              void     (*enable_ms)(struct uart_port *);  /* 使能modem的状态信号 */              void     (*break_ctl)(struct uart_port *, int ctl);  /* 设置break信号 */              int   (*startup)(struct uart_port *); /* 启动串口,应用程序打开串口设备文件时,该函数会被调用 */              void  (*shutdown)(struct uart_port *);/* 关闭串口,应用程序关闭串口设备文件时,该函数会被调用 */              void   (*flush_buffer)(struct uart_port *);              void   (*set_termios)(struct uart_port *, struct ktermios *new,                                 struct ktermios *old);   /* 设置串口参数 */              void   (*set_ldisc)(struct uart_port *);/* 设置线路规程 */              void   (*pm)(struct uart_port *, unsigned int state,                            unsigned int oldstate);   /* 串口电源管理 */              int    (*set_wake)(struct uart_port *, unsigned int state);              const char *(*type)(struct uart_port *);              void   (*release_port)(struct uart_port *);               int  (*request_port)(struct uart_port *); /* 申请必要的IO端口/IO内存资源,必要时还可以重新映射串口端口 */              void        (*config_port)(struct uart_port *, int); /* 执行串口所需的自动配置 */              int     (*verify_port)(struct uart_port *, struct serial_struct *); /* 核实新串口的信息 */              int     (*ioctl)(struct uart_port *, unsigned int, unsigned long);          #ifdef CONFIG_CONSOLE_POLL              void    (*poll_put_char)(struct uart_port *, unsigned char);              int     (*poll_get_char)(struct uart_port *);          #endif          };      调用位置 ： /kernel/drivers/tty/serial/uartxxx.c    static struct uart_ops wk2xxx_pops