03_uartLinux内核模块-编程知识

03_uartLinux内核模块

01_basicLinux内核模块-CSDN博客文章浏览阅读23次。环境ID=ubuntuMakefilemodules:clean:basic.creturn 0;运行效果。https://blog.csdn.net/m0_37132481/article/details/136157384?csdn_share_tail=%7B%22type%22%3A%22blog%22%2C%22rType%22%3A%22article%22%2C%22rId%22%3A%22136157384%22%2C%22source%22%3A%22m0_37132481%22%7Duart.c

root@T:/media/sf_D_DRIVE/kmodule/03_uart# cat uart.c
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/device.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/io.h>#define TAG "HELLO# "static void my_uart_stop_tx(struct uart_port *port)
{printk(TAG "%s\n", __func__);
}
static void echo_putchar(struct uart_port *port, u8 ch)
{/* write char output */printk("%c", ch);/* read char input */uart_insert_char(port, 0, 0, ch, 0);tty_flip_buffer_push(&port->state->port);
}
static void my_uart_start_tx(struct uart_port *port)
{printk(TAG "%s\n", __func__);u8 ch;u8 tx_ready = 1;uart_port_tx(port, ch, tx_ready, echo_putchar(port, ch));
}
static void my_uart_stop_rx(struct uart_port *port)
{printk(TAG "%s\n", __func__);
}static unsigned int my_uart_tx_empty(struct uart_port *port)
{printk(TAG "%s\n", __func__);return 0;
}/* no modem control lines */
static unsigned int my_uart_get_mctrl(struct uart_port *port)
{printk(TAG "%s\n", __func__);return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
}static void my_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{printk(TAG "%s\n", __func__);
}static void my_uart_break_ctl(struct uart_port *port, int break_state)
{printk(TAG "%s\n", __func__);
}static int my_uart_startup(struct uart_port *port)
{int ret = 0;printk(TAG "%s\n", __func__);return ret;
}static void my_uart_shutdown(struct uart_port *port)
{printk(TAG "%s\n", __func__);
}static void my_uart_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old)
{printk(TAG "%s\n", __func__);
}static const char *my_uart_type(struct uart_port *port)
{printk(TAG "%s\n", __func__);return port->type == PORT_21285 ? "my_uart_type" : NULL;
}static void my_uart_release_port(struct uart_port *port)
{printk(TAG "%s\n", __func__);
}static int my_uart_request_port(struct uart_port *port)
{printk(TAG "%s\n", __func__);return 0;
}static void my_uart_config_port(struct uart_port *port, int flags)
{printk(TAG "%s\n", __func__);if (flags & UART_CONFIG_TYPE)port->type = PORT_21285;
}/** verify the new serial_struct (for TIOCSSERIAL).*/
static int my_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
{printk(TAG "%s\n", __func__);int ret = 0;return ret;
}static const struct uart_ops my_uart_ops = {.tx_empty       = my_uart_tx_empty,.get_mctrl      = my_uart_get_mctrl,.set_mctrl      = my_uart_set_mctrl,.stop_tx        = my_uart_stop_tx,.start_tx       = my_uart_start_tx,.stop_rx        = my_uart_stop_rx,.break_ctl      = my_uart_break_ctl,.startup        = my_uart_startup,.shutdown       = my_uart_shutdown,.set_termios    = my_uart_set_termios,.type           = my_uart_type,.release_port   = my_uart_release_port,.request_port   = my_uart_request_port,.config_port    = my_uart_config_port,.verify_port    = my_uart_verify_port,
};static struct uart_port my_uart_port = {.mapbase        = 0xaabbccdd,.iotype         = UPIO_MEM,.irq            = 0,.fifosize       = 16,.ops            = &my_uart_ops,.flags          = UPF_BOOT_AUTOCONF,
};static struct uart_driver my_uart_reg = {.owner                  = THIS_MODULE,.driver_name            = "my_uart_driver",.dev_name               = "ttyMyUart",.major                  = 204,.minor                  = 4,.nr                     = 1,
};static int __init my_uart_init(void)
{int ret;my_uart_port.dev = kzalloc(sizeof(*my_uart_port.dev), GFP_KERNEL);dev_set_name(my_uart_port.dev, "%s", "my_uart_device");ret = device_register(my_uart_port.dev);my_uart_port.dev = get_device(my_uart_port.dev);ret = uart_register_driver(&my_uart_reg);if (ret == 0)ret = uart_add_one_port(&my_uart_reg, &my_uart_port);printk("ret=%d\n", ret);return ret;
}static void __exit my_uart_exit(void)
{uart_remove_one_port(&my_uart_reg, &my_uart_port);uart_unregister_driver(&my_uart_reg);device_unregister(my_uart_port.dev);kfree(my_uart_port.dev);
}module_init(my_uart_init);
module_exit(my_uart_exit);MODULE_LICENSE("GPL");

效果