include/linux/serio.h

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