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Tiny TTY driver驱动源码

tty驱动

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Tiny TTY driver驱动源码，这是ldd3描述tty驱动时候用到的示例驱动，很有参考价值。

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* Tiny TTY driver

* This program is free software; you can redistribute it and/or

modify

* it under the terms of the GNU General Public License as published

* the Free Software Foundation, version 2 of the License.

* This driver shows how to create a minimal tty driver. It does not rely

* any backing hardware, but creates a timer that emulates data being

received

* from some kind of hardware.

#include <linux/config.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/wait.h>

#include <linux/tty.h>

#include <linux/tty_driver.h>

#include <linux/tty_flip.h>

#include <linux/serial.h>

#include <asm/uaccess.h>

#define DRIVER_VERSION "v2.0"

#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"

#define DRIVER_DESC "Tiny TTY driver"

/* Module information */

MODULE_AUTHOR( DRIVER_AUTHOR );

MODULE_DESCRIPTION( DRIVER_DESC );

MODULE_LICENSE("GPL");

#define DELAY_TIME HZ * 2 /* 2 seconds per character */

#define TINY_DATA_CHARACTER 't'

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#define TINY_TTY_MAJOR 240 /* experimental range */

#define TINY_TTY_MINORS 4 /* only have 4 devices */

struct tiny_serial {

struct tty_struct *tty; /* pointer to the tty for

this device */

int open_count; /* number of times this

port has been opened */

struct semaphore sem; /* locks this structure

struct timer_list *timer;

/* for tiocmget and tiocmset functions */

int msr; /* MSR shadow */

int mcr; /* MCR shadow */

/* for ioctl fun */

struct serial_struct serial;

wait_queue_head_t wait;

struct async_icount icount;

};

static struct tiny_serial *tiny_table[TINY_TTY_MINORS]; /*

initially all NULL */

static void tiny_timer(unsigned long timer_data)

{

struct tiny_serial *tiny = (struct tiny_serial *)timer_data;

struct tty_struct *tty;

int i;

char data[1] = {TINY_DATA_CHARACTER};

int data_size = 1;

if (!tiny)

return;

tty = tiny->tty;

/* send the data to the tty layer for users to read. This doesn't

* actually push the data through unless tty->low_latency is set

for (i = 0; i < data_size; ++i) {

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if (tty->flip.count >= TTY_FLIPBUF_SIZE)

tty_flip_buffer_push(tty);

tty_insert_flip_char(tty, data[i], TTY_NORMAL);

}

tty_flip_buffer_push(tty);

/* resubmit the timer again */

tiny->timer->expires = jiffies + DELAY_TIME;

add_timer(tiny->timer);

}

static int tiny_open(struct tty_struct *tty, struct file *file)

{

struct tiny_serial *tiny;

struct timer_list *timer;

int index;

/* initialize the pointer in case something fails */

tty->driver_data = NULL;

/* get the serial object associated with this tty pointer */

index = tty->index;

tiny = tiny_table[index];

if (tiny == NULL) {

/* first time accessing this device, let's create it */

tiny = kmalloc(sizeof(*tiny), GFP_KERNEL);

if (!tiny)

return -ENOMEM;

init_MUTEX(&tiny->sem);

tiny->open_count = 0;

tiny->timer = NULL;

tiny_table[index] = tiny;

}

down(&tiny->sem);

/* save our structure within the tty structure */

tty->driver_data = tiny;

tiny->tty = tty;

++tiny->open_count;

if (tiny->open_count == 1) {

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