include/linux/serio.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 1999-2002 Vojtech Pavlik
   4  */
   5 #ifndef _SERIO_H
   6 #define _SERIO_H
   7
   8
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/list.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/mutex.h>
  14 #include <linux/device.h>
  15 #include <linux/mod_devicetable.h>
  16 #include <uapi/linux/serio.h>
  17
  18 extern struct bus_type serio_bus;
  19
  20 struct serio {
  21         void *port_data;
  22
  23         char name[32];
  24         char phys[32];
  25         char firmware_id[128];
  26
  27         bool manual_bind;
  28
  29         struct serio_device_id id;
  30
  31         /* Protects critical sections from port's interrupt handler */
  32         spinlock_t lock;
  33
  34         int (*write)(struct serio *, unsigned char);
  35         int (*open)(struct serio *);
  36         void (*close)(struct serio *);
  37         int (*start)(struct serio *);
  38         void (*stop)(struct serio *);
  39
  40         struct serio *parent;
  41         /* Entry in parent->children list */
  42         struct list_head child_node;
  43         struct list_head children;
  44         /* Level of nesting in serio hierarchy */
  45         unsigned int depth;
  46
  47         /*
  48          * serio->drv is accessed from interrupt handlers; when modifying
  49          * caller should acquire serio->drv_mutex and serio->lock.
  50          */
  51         struct serio_driver *drv;
  52         /* Protects serio->drv so attributes can pin current driver */
  53         struct mutex drv_mutex;
  54
  55         struct device dev;
  56
  57         struct list_head node;
  58
  59         /*
  60          * For use by PS/2 layer when several ports share hardware and
  61          * may get indigestion when exposed to concurrent access (i8042).
  62          */
  63         struct mutex *ps2_cmd_mutex;
  64 };
  65 #define to_serio_port(d)        container_of(d, struct serio, dev)
  66
  67 struct serio_driver {
  68         const char *description;
  69
  70         const struct serio_device_id *id_table;
  71         bool manual_bind;
  72
  73         void (*write_wakeup)(struct serio *);
  74         irqreturn_t (*interrupt)(struct serio *, unsigned char, unsigned int);
  75         int  (*connect)(struct serio *, struct serio_driver *drv);
  76         int  (*reconnect)(struct serio *);
  77         int  (*fast_reconnect)(struct serio *);
  78         void (*disconnect)(struct serio *);
  79         void (*cleanup)(struct serio *);
  80
  81         struct device_driver driver;
  82 };
  83 #define to_serio_driver(d)      container_of(d, struct serio_driver, driver)
  84
  85 int serio_open(struct serio *serio, struct serio_driver *drv);
  86 void serio_close(struct serio *serio);
  87 void serio_rescan(struct serio *serio);
  88 void serio_reconnect(struct serio *serio);
  89 irqreturn_t serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags);
  90
  91 void __serio_register_port(struct serio *serio, struct module *owner);
  92
  93 /* use a define to avoid include chaining to get THIS_MODULE */
  94 #define serio_register_port(serio) \
  95         __serio_register_port(serio, THIS_MODULE)
  96
  97 void serio_unregister_port(struct serio *serio);
  98 void serio_unregister_child_port(struct serio *serio);
  99
 100 int __must_check __serio_register_driver(struct serio_driver *drv,
 101                                 struct module *owner, const char *mod_name);
 102
 103 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 104 #define serio_register_driver(drv) \
 105         __serio_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)
 106
 107 void serio_unregister_driver(struct serio_driver *drv);
 108
 109 /**
 110  * module_serio_driver() - Helper macro for registering a serio driver
 111  * @__serio_driver: serio_driver struct
 112  *
 113  * Helper macro for serio drivers which do not do anything special in
 114  * module init/exit. This eliminates a lot of boilerplate. Each module
 115  * may only use this macro once, and calling it replaces module_init()
 116  * and module_exit().
 117  */
 118 #define module_serio_driver(__serio_driver) \
 119         module_driver(__serio_driver, serio_register_driver, \
 120                        serio_unregister_driver)
 121
 122 static inline int serio_write(struct serio *serio, unsigned char data)
 123 {
 124         if (serio->write)
 125                 return serio->write(serio, data);
 126         else
 127                 return -1;
 128 }
 129
 130 static inline void serio_drv_write_wakeup(struct serio *serio)
 131 {
 132         if (serio->drv && serio->drv->write_wakeup)
 133                 serio->drv->write_wakeup(serio);
 134 }
 135
 136 /*
 137  * Use the following functions to manipulate serio's per-port
 138  * driver-specific data.
 139  */
 140 static inline void *serio_get_drvdata(struct serio *serio)
 141 {
 142         return dev_get_drvdata(&serio->dev);
 143 }
 144
 145 static inline void serio_set_drvdata(struct serio *serio, void *data)
 146 {
 147         dev_set_drvdata(&serio->dev, data);
 148 }
 149
 150 /*
 151  * Use the following functions to protect critical sections in
 152  * driver code from port's interrupt handler
 153  */
 154 static inline void serio_pause_rx(struct serio *serio)
 155 {
 156         spin_lock_irq(&serio->lock);
 157 }
 158
 159 static inline void serio_continue_rx(struct serio *serio)
 160 {
 161         spin_unlock_irq(&serio->lock);
 162 }
 163
 164 #endif