在内核空间中如何操作串口？？
最近在做开发的时候遇到了一个问题一直搞不明白，想请大家帮忙解决一下。问提是这样的，我需要做一个打印机驱动，驱动实现的功能是：驱动程序接受到用户空间的数据，然后处理数据，最后在驱动中把数据通过串口传输给打印机。我想问的是怎么样在内核驱动中来设置串口的波特率，实现读写的操作？？？串口的驱动在系统中是已经有了的。 有没有回复一下子啊 可以参照这个注册的函数static int __init usb_serial_init(void)
{
int i;
int result;
usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
if (!usb_serial_tty_driver)
return -ENOMEM;
/* Initialize our global data */
for (i = 0; i < SERIAL_TTY_MINORS; ++i)
serial_table = NULL;
result = bus_register(&usb_serial_bus_type);
if (result) {
printk(KERN_ERR "usb-serial: %s - registering bus driver "
"failed\n", __func__);
goto exit_bus;
}
usb_serial_tty_driver->owner = THIS_MODULE;
usb_serial_tty_driver->driver_name = "usbserial";
usb_serial_tty_driver->name = "ttyUSB";
usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
usb_serial_tty_driver->minor_start = 0;
usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV;
usb_serial_tty_driver->init_termios = tty_std_termios;
usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
| HUPCL | CLOCAL;
usb_serial_tty_driver->init_termios.c_ispeed = 9600;
usb_serial_tty_driver->init_termios.c_ospeed = 9600;
tty_set_operations(usb_serial_tty_driver, &serial_ops);
result = tty_register_driver(usb_serial_tty_driver);
if (result) {
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