drivers/tty/serial/serial_ctrl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Serial core controller driver
   4  *
   5  * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
   6  * Author: Tony Lindgren <tony@atomide.com>
   7  *
   8  * This driver manages the serial core controller struct device instances.
   9  * The serial core controller devices are children of the physical serial
  10  * port device.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <linux/module.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/serial_core.h>
  17 #include <linux/spinlock.h>
  18
  19 #include "serial_base.h"
  20
  21 static int serial_ctrl_probe(struct device *dev)
  22 {
  23         pm_runtime_enable(dev);
  24
  25         return 0;
  26 }
  27
  28 static int serial_ctrl_remove(struct device *dev)
  29 {
  30         pm_runtime_disable(dev);
  31
  32         return 0;
  33 }
  34
  35 /*
  36  * Serial core controller device init functions. Note that the physical
  37  * serial port device driver may not have completed probe at this point.
  38  */
  39 int serial_ctrl_register_port(struct uart_driver *drv, struct uart_port *port)
  40 {
  41         return serial_core_register_port(drv, port);
  42 }
  43
  44 void serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port)
  45 {
  46         serial_core_unregister_port(drv, port);
  47 }
  48
  49 static struct device_driver serial_ctrl_driver = {
  50         .name = "ctrl",
  51         .suppress_bind_attrs = true,
  52         .probe = serial_ctrl_probe,
  53         .remove = serial_ctrl_remove,
  54 };
  55
  56 int serial_base_ctrl_init(void)
  57 {
  58         return serial_base_driver_register(&serial_ctrl_driver);
  59 }
  60
  61 void serial_base_ctrl_exit(void)
  62 {
  63         serial_base_driver_unregister(&serial_ctrl_driver);
  64 }
  65
  66 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
  67 MODULE_DESCRIPTION("Serial core controller driver");
  68 MODULE_LICENSE("GPL");